Tail-rope-free friction lifting device for ultra-deep well

Abstract

The invention discloses an ultra-deep well tail-rope-free friction lifting device, which relates to the technical field of friction type lifting and comprises a plurality of coaxially arranged first friction wheels, a first driving assembly, a plurality of coaxially arranged second friction wheels and a friction rope assembly, the first driving assembly is in transmission connection with the first friction wheel; the second friction wheels are arranged below the first friction wheels, and the number of the second friction wheels is smaller than that of the first friction wheels; the two ends of the friction rope assembly are each provided with a lifting container, and the friction rope assembly is wound around the first friction wheel, the second friction wheel and the next first friction wheel in sequence. The tail-rope-free friction lifting device for the ultra-deep well does not depend on tail rope balance, and the lifting capacity is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of friction lifting, in particular to a tail-ropeless friction lifting device for ultra-deep wells. Background Art

[0002] After mining, underground minerals are often brought to the surface using hoisting equipment. Commonly used hoisting equipment includes single-rope winding hoists, multi-rope winding hoists, and multi-rope friction hoists. Single-rope winding hoists are generally used in mines less than 300 meters deep, while multi-rope winding hoists are commonly used in mines between 300 and 1,600 meters deep. Multi-rope friction hoists are often used in mines deeper than 1,600 meters.

[0003] Friction-type hoists often require a tail rope for balancing. This rope dynamically offsets the tension differences in the main rope caused by length variations, maintaining the required tension ratio for friction transmission. However, in ultra-deep well hoists, the tail rope hangs from the bottom of the well, and its deadweight increases exponentially with depth, significantly limiting hoisting capacity. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an ultra-deep well tail rope-free friction hoisting device that does not rely on tail rope balance and increases the hoisting capacity.

[0005] The ultra-deep well tail-ropeless friction hoisting device according to an embodiment of the present invention includes a plurality of coaxially arranged first friction wheels; a first drive assembly, the first drive assembly being in transmission connection with the first friction wheel; a plurality of coaxially arranged second friction wheels, wherein the second friction wheels are arranged below the first friction wheels, and the number of the second friction wheels is less than the number of the first friction wheels; A friction rope assembly, both ends of which are provided with lifting containers, and the friction rope assembly is wound in the following manner: winding around the first friction wheel, the second friction wheel, and the next first friction wheel in sequence.

[0006] The ultra-deep well tail rope-free friction lifting device according to the embodiment of the present invention has at least the following beneficial effects: the first friction wheel is transmission-connected to the first drive assembly and serves as a drive wheel; the number of first friction wheels is greater than the number of second friction wheels, so that after the friction rope assembly passes around the first friction wheel, the second friction wheel and the next first friction wheel, at least two first friction wheels are in contact and entangled with the friction rope assembly, that is, the total effective friction wrap angle between the friction rope assembly and the first friction wheels is at least 360°, which can eliminate the tail rope and eliminate the tail rope's own weight burden, thereby increasing the lifting capacity.

[0007] According to some embodiments of the present invention, there are two first friction wheels, namely the first friction wheel A and the first friction wheel B, and there is one second friction wheel, and the friction rope assembly is wound around the first friction wheel A, the second friction wheel and the first friction wheel B in sequence.

[0008] According to some embodiments of the present invention, the first drive assembly includes a drive motor A and a drive motor B, the drive motor A is in transmission connection with the first friction wheel A, and the drive motor B is in transmission connection with the first friction wheel B.

[0009] According to some embodiments of the present invention, the first friction wheel is provided with a wheel groove along the circumference, and the second friction wheel is also provided with a wheel groove along the circumference, and pads are provided in the wheel grooves. The friction rope assembly is placed in the wheel grooves and contacts the pads, and the friction coefficient between the pads and the friction rope assembly is greater than the friction coefficient between the friction rope assembly and the first friction wheel or the second friction wheel.

[0010] According to some embodiments of the present invention, the friction coefficient between the pad and the friction rope assembly is μ, μ≥0.3.

[0011] According to some embodiments of the present invention, the first friction wheel is provided with a plurality of wheel grooves, the second friction wheel is provided with a plurality of wheel grooves, the friction rope assembly includes a plurality of steel ropes, the number of the wheel grooves corresponds to the number of the steel ropes, and the number of the steel ropes is at least two and an even number.

[0012] According to some embodiments of the present invention, the diameter of the first friction wheel A is the same as the diameter of the first friction wheel B, and the rotation speed of the first friction wheel A is the same as the rotation speed of the first friction wheel B.

[0013] According to some embodiments of the present invention, the diameter of the second friction wheel is smaller than the diameter of the first friction wheel.

[0014] According to some embodiments of the present invention, in the rotation plane of the first friction wheel, the two lifting containers are respectively suspended on both sides of the first friction wheel.

[0015] According to some embodiments of the present invention, an adjusting device is further included, wherein the adjusting device is connected to the second friction wheel, and the adjusting device is capable of adjusting the tension balance of the friction rope assembly.

[0016] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which: Figure 1 This is a schematic structural diagram of an ultra-deep well tail-rope-less friction lifting device according to an embodiment of the present invention; Figure 2 A side view of an ultra-deep well tail-ropeless friction lifting device according to an embodiment of the present invention; Figure 3 This is a front view of an ultra-deep well tail-ropeless friction lifting device according to an embodiment of the present invention.

[0018] Figure Number: A first friction wheel 100 , a second friction wheel 200 , a friction rope assembly 300 , and a lifting container 400 . DETAILED DESCRIPTION

[0019] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0020] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In the description of the present invention, "a plurality" refers to more than two. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0023] As described in the background technology, ultra-deep wells generally refer to mines with a depth greater than or equal to 1,600 meters. Due to the great depth of the mine, the length of the tail rope needs to be increased during friction-type hoisting using a tail rope, resulting in an increase in the tail rope's own weight. According to past experience, in ultra-deep wells, the tail rope's own weight accounts for 30% to 40% of the breaking force of the steel rope, resulting in a sharp decrease in the amount of minerals lifted in a single lift. At the same time, in order to accommodate longer tail ropes, a large tail rope buffer chamber needs to be excavated at the bottom of the well, increasing the cost of mine construction. During hoisting, the swing of the tail rope can easily induce resonance of the steel rope, accelerate the wear of the friction wheel and its accessories, and easily cause rope breaking accidents.

[0024] Reference Figure 1 、 Figure 2 and Figure 3 As shown, an ultra-deep well tail rope-free friction lifting device according to an embodiment of the present invention includes a plurality of coaxially arranged first friction wheels 100, a first drive assembly, a plurality of coaxially arranged second friction wheels 200 and a friction rope assembly 300.

[0025] The first drive assembly is transmission-connected to the first friction wheel 100; the second friction wheel 200 is arranged below the first friction wheel 100, and the number of the second friction wheels 200 is less than the number of the first friction wheels 100; lifting containers 400 are provided at both ends of the friction rope assembly 300, and the winding method of the friction rope assembly 300 is to wrap around the first friction wheel 100, the second friction wheel 200, and the next first friction wheel 100 in sequence.

[0026] First, according to the mechanical Euler formula, the condition for no slip in friction lifting is to satisfy the formula: T s -T x <T x (e μα -1). In the formula, the rope tension on the rising side is T s , the rope tension on the descending side is T x , the friction coefficient between the steel rope and the friction wheel is μ, and the effective friction angle between the steel rope and the friction wheel is α. If the change is equal to the equation, that is, δ(T s -T x ) = T x (e μα -1), where δ is the anti-slip safety factor, it can be concluded that when the rope tension T s and the rope tension T on the descending side x When the effective friction angle α between the steel rope and the friction wheel increases, the anti-skid safety factor δ increases. When the anti-skid safety factor δ is constant, the effective friction angle α between the steel rope and the friction wheel increases, then the difference (T s -T x ) increases, that is, the lifting amount increases.

[0027] On the other hand, in formula T max / T min ≤e μα In, T max is the maximum tension of the steel rope, T min is the minimum tension of the steel rope, and the formula reflects the tension ratio T max / T min The relationship between the effective friction wrap angle α and the friction coefficient μ. When the friction coefficient μ is constant, increasing the effective friction wrap angle α will allow the tension ratio to increase, higher than that of traditional multi-rope friction hoisting with a tail rope.

[0028] In the structure of the embodiment of the present invention, the friction rope assembly 300 sequentially wraps around the first friction wheel 100, the second friction wheel 200, and the next first friction wheel 100. The friction rope assembly 300 is in contact and wrapped around at least two first friction wheels 100. During the contact and wrapping between the friction rope assembly 300 and a single first friction wheel 100 and the friction rope assembly 300, the effective friction wrap angle is 180°. Therefore, in the entire lifting device, the total effective friction wrap angle between the friction rope assembly 300 and the first friction wheels 100 is at least 360°. By increasing the effective friction wrap angle, the lifting capacity is increased, and there is no need to rely on a tail rope for balance.

[0029] During the lifting process, the first friction wheel 100 is driven by the first drive assembly to rotate. The first friction wheel 100 contacts the friction rope assembly 300, and the friction wheel drives the friction rope assembly 300 to move, thereby changing the height of the lifting container 400 at both ends of the friction rope assembly 300. It should be understood that the second friction wheel 200 is used to change the movement direction of the friction rope assembly 300 and serves as a driven wheel.

[0030] In some specific embodiments, it can be understood that there are two first friction wheels 100, namely the first friction wheel A and the first friction wheel B, and there is only one second friction wheel 200, and the friction rope assembly 300 passes around the first friction wheel A, the second friction wheel 200 and the first friction wheel B in sequence.

[0031] T1 is the tension at the first end of the friction rope assembly 300, and T2 is the tension at the second end of the friction rope assembly 300. If the load at the first end of the friction rope assembly 300 suddenly increases, that is, T1 increases, in a traditional friction hoisting system with a tail rope, the tail rope weight W t Used for balance, satisfying the formula T1-T2≤μαT2+W t In the embodiment of the present application, T1 increases, resulting in the friction force F of the first friction wheel A on the steel rope A =μT1α A Increase, that is, the rope tension increases and is transmitted to the second friction wheel 200, which then distributes the tension difference ΔT=T1-T2 to the rope segments on both sides. The first friction wheel B senses the increase in input tension, the output torque increases, and T2 increases synchronously. Finally, the system stabilizes at T1′=T2′+ΔT 新 , where ΔT 新 <ΔT, part of the tension difference is absorbed by the friction path, and there is no need for the weight of the tail rope to compensate.

[0032] Preferably, in a direction parallel to the rotation axis of the first friction wheel 100 or the second friction wheel 200 , the second friction wheel 200 is located at the center of the interval between the two first friction wheels 100 .

[0033] The first drive assembly can simultaneously drive the rotation of the first friction wheel A and the first friction wheel B, i.e., a single drive motor is sufficient; or it can selectively drive the rotation of the first friction wheel A and the first friction wheel B separately, i.e., the rotation of the first friction wheel A and the first friction wheel B can be adjusted separately. For example, it is understood that the first drive assembly includes a drive motor A and a drive motor B, where the drive motor A is in transmission connection with the first friction wheel A, and the drive motor B is in transmission connection with the first friction wheel B.

[0034] Compared with using the first drive assembly to simultaneously drive the first friction wheel A and the first friction wheel B, the solution of using the drive motor A to drive the first friction wheel A and the drive motor B to drive the first friction wheel B can reduce the power of a single drive motor and expand the selection range of the drive motor.

[0035] It can be understood that the first friction wheel 100 is provided with a wheel groove along the circumferential direction, and the second friction wheel 200 is also provided with a wheel groove along the circumferential direction. Pads are provided in the wheel grooves, and the friction rope assembly 300 is placed in the wheel grooves and in contact with the pads. The friction coefficient between the pads and the friction rope assembly 300 is greater than the friction coefficient between the friction rope assembly 300 and the first friction wheel 100 or the second friction wheel 200.

[0036] To further increase lifting capacity, the friction between the first friction wheel 100 and the friction rope assembly 300 can be increased. It should be understood that static friction exists between the friction rope assembly 300 and the first friction wheel 100. The friction coefficient between the first friction wheel 100 and the friction rope assembly 300 can be increased to improve friction. Specifically, pads are fixed within the wheel grooves of the first friction wheel 100 and the second friction wheel 200, respectively. The friction rope assembly 300 contacts the pads directly and the friction wheels indirectly. The friction coefficient between the pads and the friction rope assembly 300 is greater than the friction coefficient between the friction rope assembly 300 and the first friction wheel 100 or the second friction wheel 200.

[0037] It can be understood that the friction coefficient between the pad and the friction rope assembly 300 is μ, preferably μ≥0.3.

[0038] It can be understood that the first friction wheel 100 has multiple wheel grooves, the second friction wheel 200 has multiple wheel grooves, the friction rope assembly 300 includes multiple steel ropes, the number of wheel grooves corresponds to the number of steel ropes, and there are at least two steel ropes and an even number.

[0039] It should be understood that increasing the number of steel ropes can also increase the lifting capacity.

[0040] It can be understood that the diameter of the first friction wheel A is the same as the diameter of the first friction wheel B, and the rotation speed of the first friction wheel A is the same as the rotation speed of the first friction wheel B to ensure that the friction rope assembly 300 moves evenly.

[0041] It is understood that, preferably, the diameter of the second friction wheel 200 is smaller than the diameter of the first friction wheel 100 . In addition, the diameter of the second friction wheel 200 should be slightly smaller than the diameter of the first friction wheel 100 .

[0042] The diameter of the second friction wheel 200 is set to be slightly smaller than the diameter of the first friction wheel 100 in order to prevent the friction rope assembly 300 from slipping and to extend the service life of the friction rope assembly 300 .

[0043] It should be understood that the friction rope assembly 300, such as a steel rope, can experience elastic creep on the first and second friction wheels 100 and 200, i.e., micro-slip caused by elastic elongation of the rope. Setting the diameter of the second friction wheel 200 slightly smaller than that of the first friction wheel 100, so that the linear velocity of the rope on the second friction wheel 200 is slightly lower than that on the first friction wheel 100, creates a preload differential, compensates for the elastic elongation of the rope, and prevents slippage. Furthermore, if the diameter of the second friction wheel 200 is greater than or equal to that of the first friction wheel 100, this may cause additional lateral deflection of the rope when it contacts the first and second friction wheels 100 and 200 in the vertical section, increasing the risk of wear.

[0044] It can be understood that, in the rotation plane of the first friction wheel 100 , the two lifting containers 400 are suspended on both sides of the first friction wheel 100 .

[0045] It can be understood that an adjusting device is also included, which is connected to the second friction wheel 200 and can adjust the tension balance of the friction rope assembly 300.

[0046] The adjustment device may use a hydraulic tension balancing device. It should be understood that, in friction-type lifting, the use of a hydraulic tension balancing device to adjust the tension of the friction rope assembly 300 is a mature technical means, and the connection structure between the hydraulic tension balancing device and the friction wheel is also a mature technical means. In the embodiment of the present application, the adjustment device is mainly limited to being connected to the second friction wheel 200, which can achieve tension balancing adjustment of the friction rope assembly 300 without affecting the driving of the friction rope assembly 300 by the first friction wheel 100.

[0047] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the scope of the present invention.

Claims

1. An ultra-deep well tail-ropeless friction lifting device, characterized in that: include: a plurality of coaxially arranged first friction wheels; a first drive assembly, the first drive assembly being in transmission connection with the first friction wheel; a plurality of coaxially arranged second friction wheels, wherein the second friction wheels are arranged below the first friction wheels, and the number of the second friction wheels is less than the number of the first friction wheels; A friction rope assembly, both ends of which are provided with lifting containers, and the friction rope assembly is wound in the following manner: winding around the first friction wheel, the second friction wheel, and the next first friction wheel in sequence.

2. The ultra-deep well tail-ropeless friction lifting device according to claim 1 is characterized in that: There are two first friction wheels, namely the first friction wheel A and the first friction wheel B, and there is one second friction wheel. The friction rope assembly passes around the first friction wheel A, the second friction wheel and the first friction wheel B in sequence.

3. The ultra-deep well tail-ropeless friction lifting device according to claim 2 is characterized in that: The first driving assembly includes a driving motor A and a driving motor B. The driving motor A is in transmission connection with the first friction wheel A, and the driving motor B is in transmission connection with the first friction wheel B.

4. The ultra-deep well tail-ropeless friction lifting device according to claim 1, characterized in that: The first friction wheel is provided with a wheel groove along the circumference, and the second friction wheel is also provided with a wheel groove along the circumference. Pads are provided in the wheel grooves. The friction rope assembly is placed in the wheel grooves and contacts the pads. The friction coefficient between the pads and the friction rope assembly is greater than the friction coefficient between the friction rope assembly and the first friction wheel or the second friction wheel.

5. The ultra-deep well tail-ropeless friction lifting device according to claim 4 is characterized in that: The friction coefficient between the pad and the friction rope assembly is μ, μ≥0.

3.

6. The ultra-deep well tail-ropeless friction lifting device according to claim 4, characterized in that: The first friction wheel is provided with a plurality of wheel grooves, the second friction wheel is provided with a plurality of wheel grooves, the friction rope assembly includes a plurality of steel ropes, the number of the wheel grooves corresponds to the number of the steel ropes, and the number of the steel ropes is at least two and an even number.

7. The ultra-deep well tail-ropeless friction lifting device according to claim 2, characterized in that: The diameter of the first friction wheel A is the same as that of the first friction wheel B, and the rotation speed of the first friction wheel A is the same as that of the first friction wheel B.

8. The ultra-deep well tail-ropeless friction lifting device according to claim 7, characterized in that: The diameter of the second friction wheel is smaller than the diameter of the first friction wheel.

9. The ultra-deep well tail-ropeless friction lifting device according to claim 1, characterized in that: In the rotation plane of the first friction wheel, the two lifting containers are respectively suspended on both sides of the first friction wheel.

10. The ultra-deep well tail-ropeless friction lifting device according to claim 1, characterized in that: It also includes an adjusting device, which is connected to the second friction wheel and can adjust the tension balance of the friction rope assembly.

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