A dual-drive multi-rope friction hoisting system suitable for ultra-deep well large-load hoisting

Abstract

The present invention provides a dual-drive multi-rope friction hoisting system suitable for large-load hoisting in ultra-deep wells, comprising: a first friction wheel and a second friction wheel; the first friction wheel is equipped with a first hoisting head rope, one end of the first hoisting head rope is hung with a first hoisting container, and the other end of the first hoisting head rope is hung with a second hoisting container; the second friction wheel is equipped with a second hoisting head rope, one end of the second hoisting head rope bypasses a first head sheave and is hung with the second hoisting container, and the other end of the second hoisting head rope bypasses a second head sheave and is hung with the first hoisting container; the hoisting system further comprises a balance tail rope, one end of the balance tail rope is hung at the bottom of the first hoisting container, and the other end of the balance tail rope is hung at the bottom of the second hoisting container. The present invention adopts a dual-friction-wheel dual-drive unit and two groups of multi-quantity hoisting head ropes, increasing the total wrap angle of the hoisting head ropes on the friction wheel, doubling the frictional force, increasing the hoisting load capacity, and significantly increasing the hoisting depth and hoisting load.

Description

Technical Field

[0001] The present invention relates to the technical field of ultra-deep well large-load hoisting, and particularly to a double-drive multi-rope friction hoisting system suitable for ultra-deep well large-load hoisting. Background Art

[0002] Shaft hoisting is a conventional method for underground mine development and transportation, and is responsible for hoisting ore, waste rock, personnel, materials, etc. At present, the conventional shaft hoisting methods mainly include single-rope winding hoisting system and multi-rope friction hoisting system. Compared with the single-rope winding hoisting system, the multi-rope friction hoisting system is more suitable for deep well heavy-load hoisting, and is applicable to shafts with a depth of 300m to 1400m; the multi-rope friction hoisting is further subdivided into tower hoisting and ground-mounted hoisting. Both hoisting methods are hoisted by a single hoist, and the driving unit drives the friction wheel to drive the steel wire rope and the hoisting container to move. Limited by the existing hoisting methods and equipment levels, when the mining depth exceeds 1400m, the multi-rope friction hoist cannot achieve one-stage hoisting, and often requires multi-stage relay hoisting.

[0003] At present, there are many studies on ultra-deep well large-load hoisting, mainly including the research on multi-rope winding hoists, the research on the lightweight of hoisting containers, the research on hoisting traction technical parameters, the research on the structural performance and operation reliability of steel wire ropes, etc. Summary of the Invention

[0004] The present invention provides a double-drive multi-rope friction hoisting system suitable for ultra-deep well large-load hoisting to solve the technical problems of low load-bearing capacity of the first hoisting head rope and small load ratio of the hoisting container to the load of the first hoisting head rope.

[0005] The technical solution provided by the present invention is as follows:

[0006] An object of the present invention is to provide a double-drive multi-rope friction hoisting system suitable for ultra-deep well large-load hoisting, and the hoisting system includes: a first friction wheel and a second friction wheel;

[0007] The first friction wheel is equipped with a first hoisting head rope, one end of the first hoisting head rope is suspended with a first hoisting container, and the other end of the first hoisting head rope is suspended with a second hoisting container;

[0008] The second friction wheel is equipped with a second hoisting head rope, one end of the second hoisting head rope bypasses the first head sheave and suspends the second hoisting container, and the other end of the second hoisting head rope bypasses the second head sheave and suspends the first hoisting container;

[0009] The hoisting system further includes a balance tail rope, one end of the balance tail rope is suspended at the bottom of the first hoisting container, and the other end of the balance tail rope is suspended at the bottom of the second hoisting container; the balance tail rope freely hangs in the shaft to form a tail rope loop.

[0010] In a preferred embodiment, the first friction wheel, the first head sheave, and the second head sheave are arranged on the shaft tower; the second friction wheel is arranged in the ground hoist house.

[0011] In a preferred embodiment, the number of the first hoisting head ropes is even, and the number of the second hoisting head ropes is even; the number of the first hoisting head ropes is the same as that of the second hoisting head ropes.

[0012] In a preferred embodiment, the number of the first hoisting head ropes is four or six, and the number of the second hoisting head ropes is four or six.

[0013] In a preferred embodiment, the number of the first hoisting head ropes is six, and the number of the second hoisting head ropes is six;

[0014] At the top of the first hoisting container, six first hoisting head ropes and six second hoisting head ropes are symmetrically arranged with respect to the first center line of the first hoisting container;

[0015] At the top of the second hoisting container, six first hoisting head ropes and six second hoisting head ropes are symmetrically arranged with respect to the second center line of the second hoisting container.

[0016] In a preferred embodiment, the number of the balance tail ropes is eight, and the mass of the balance tail ropes is equal to the sum of the masses of the first hoisting head ropes and the second hoisting head ropes.

[0017] In a preferred embodiment, the hoisting system further includes a first driving unit and a second driving unit. The first driving unit is the main drive and drives the first friction wheel in a variable frequency speed control manner; the second driving unit is the slave drive and drives the second friction wheel in a variable frequency speed control manner; the main drive is in a closed-loop speed control mode, and the slave drive is in a closed-loop torque control mode. The two driving units are interlocked through a control system.

[0018] The above technical solution of the present invention has at least the following beneficial effects compared with the prior art:

[0019] The present invention provides a double-drive multi-rope friction hoisting system suitable for hoisting in ultra-deep wells with large loads. By changing the hoisting method and hoisting structure, a double friction wheel and double driving unit and a larger number of hoisting head ropes are adopted, the total wrap angle of the hoisting head ropes on the friction wheel is increased, the friction force is doubled, and the hoisting load is increased; the bearing capacity of the hoisting head ropes is improved, and the proportion of the load of the hoisting container in the terminal load of the hoisting head ropes is reduced, so that the hoisting depth and hoisting load are greatly increased.

[0020] The present invention provides a dual-drive multi-rope friction hoisting system suitable for hoisting large loads in ultra-deep wells. Under the existing equipment level, it can achieve multi-rope friction hoisting in ultra-deep wells over 2000m with large loads. For an underground mine with a scale of 5 million t / a, the hoisting depth of a new type of dual-drive multi-rope friction hoisting system can reach over 2000m.

[0021] The present invention provides a dual-drive multi-rope friction hoisting system suitable for hoisting large loads in ultra-deep wells, which adopts variable frequency speed control to realize synchronous driving of the friction wheels by two driving units, ensuring power balance of the two driving units.

[0022] The present invention provides a dual-drive multi-rope friction hoisting system suitable for hoisting large loads in ultra-deep wells, which arranges two multi-rope friction hoisting machines. The maximum static tension and static tension difference acting on each friction wheel are the same, which is half of the maximum static tension and static tension difference generated by the hoisting system.

[0023] The present invention provides a dual-drive multi-rope friction hoisting system suitable for hoisting large loads in ultra-deep wells. At the top of the hoisting container, the hoisting head ropes are symmetrically arranged with the center line of the hoisting container as the reference, realizing doubling of the number of hoisting head ropes. Each set of hoisting head ropes is respectively placed on different friction wheels, forming a relatively independent layout. On the premise of meeting safety codes and industry standards, the hoisting head ropes are arranged in two rows without additionally increasing the cross-sectional size of the hoisting container and the shaft cross-sectional size. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 is a schematic structural diagram of a dual-drive multi-rope friction hoisting system suitable for hoisting large loads in ultra-deep wells of the present invention.

[0026] Figure 2 is a cross-sectional view of the first hoisting container and the second hoisting container in the shaft of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0028] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings as understood by those of ordinary skill in the art to which the present invention pertains. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a", "an" or "the" do not denote a quantity limitation, but mean that there is at least one. Terms such as "comprising" or "including" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0029] It should be noted that the "upper", "lower", "left", "right", "front", "rear", etc. used in the present invention are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0030] Combined Figures 1 to 2 , according to an embodiment of the present invention, there is provided a dual-drive multi-rope friction hoisting system suitable for ultra-deep well large-load hoisting, including: a first friction wheel 1 and a second friction wheel 2.

[0031] The first friction wheel 1 carries a first hoisting head rope 5. One end of the first hoisting head rope 5 suspends a first hoisting container 8, and the other end of the second hoisting head rope 5 suspends a second hoisting container 9. The second friction wheel 2 carries a second hoisting head rope 6. One end of the second hoisting head rope 6 bypasses a first skywheel 3 to suspend the second hoisting container 9, and the other end of the second hoisting head rope 6 bypasses a second skywheel 4 to suspend the first hoisting container 8.

[0032] According to an embodiment of the present invention, the first friction wheel 1, the first skywheel 3 and the second skywheel 4 are arranged on a well tower (not shown in the figure), and the second friction wheel 2 is arranged in a ground hoisting machine room (not shown in the figure).

[0033] According to an embodiment of the present invention, the hoisting system further includes a first driving unit and a second driving unit. The first driving unit is the main drive and drives the first friction wheel 1 in a variable-frequency speed control manner. The second driving unit is the slave drive and drives the second friction wheel 2 in a variable-frequency speed control manner.

[0034] In one embodiment, the main drive of the first driving unit drives the first friction wheel 1 in a closed-loop speed control manner, and the slave drive of the second driving unit drives the second friction wheel 2 in a closed-loop torque control manner.

[0035] In a further embodiment, the first driving unit and the second driving unit are interlocked through a control system.

[0036] According to an embodiment of the present invention, the hoisting system further includes a balance tail rope 7. One end of the balance tail rope 7 is suspended at the bottom of the first hoisting container 8, and the other end of the balance tail rope 7 is suspended at the bottom of the second hoisting container 9. The balance tail rope freely hangs in the shaft 10 to form a tail rope loop. The mass of the first hoisting container 8 is the same as the mass of the second hoisting container 9. In one embodiment, the first hoisting container 8 and the second hoisting container 9 are skip or cage.

[0037] In an embodiment of the present invention, the first hoisting head rope 5, the second hoisting head rope 6 and the balance tail rope 7 are preferably steel ropes.

[0038] According to an embodiment of the present invention, the number of the first hoisting head ropes 5 is even, the number of the second hoisting head ropes 6 is even, and the number of the first hoisting head ropes 5 is the same as the number of the second hoisting head ropes 6. Further, the number of the first hoisting head ropes 5 and the second hoisting head ropes 6 is 4 or 6. To meet the requirements of ultra-deep well and large load hoisting, the number of the first hoisting head ropes 5 and the second hoisting head ropes 6 is preferably 6.

[0039] According to an embodiment of the present invention, the number of the balance tail ropes 7 is 8, and the mass of the 8 balance tail ropes 7 is equal to the sum of the masses of the 6 first hoisting head ropes 5 and the 6 second hoisting head ropes 6, which is used to balance the weights of the first hoisting head ropes 5 and the second hoisting head ropes 6 and reduce the tension difference acting on the first friction wheel 1 and the second friction wheel 2 by the first hoisting head ropes 5 and the second hoisting head ropes 6.

[0040] As Figure 2 shown, at the top of the first hoisting container 8, the 6 first hoisting head ropes 5 and the 6 second hoisting head ropes 6 are symmetrically arranged with respect to the first central line 11 of the first hoisting container 8. At the top of the second hoisting container 9, the 6 first hoisting head ropes 5 and the 6 second hoisting head ropes 6 are symmetrically arranged with respect to the second central line 12 of the second hoisting container 9.

[0041] The first hoisting container 8 and the second hoisting container 9 are symmetrically suspended in the shaft 10 with respect to the first shaft central line 14 of the shaft 10. The first hoisting container 8 is suspended in the shaft 10 with the second shaft central line 13 of the shaft 10 as the axis of symmetry. The second hoisting container 9 is suspended in the shaft 10 with the second shaft central line 13 of the shaft 10 as the axis of symmetry.

[0042] According to an embodiment of the present invention, the first hoisting head rope 5 is driven to move by the friction between the liner on the first friction wheel 1 and the first hoisting head rope 5. The second hoisting head rope 6 is driven to move by the friction between the liner on the second friction wheel 2 and the second hoisting head rope 6.

[0043] The first hoisting headrope 5 and the second hoisting headrope 6 of the present invention move simultaneously, causing the first hoisting container 8 and the second hoisting container 9 to move up and down, completing the hoisting of the hoisting container on the heavy load side and the lowering of the hoisting container on the no-load side.

[0044] For example, when the second hoisting container 9 is loaded with goods, the second hoisting container 9 is the hoisting container on the heavy load side, and the first hoisting container 8 is the hoisting container on the no-load side. By the simultaneous movement of the first hoisting headrope 5 and the second hoisting headrope 6, the first hoisting container 8 and the second hoisting container 9 move up and down, completing the hoisting of the second hoisting container 9 and the lowering of the first hoisting container 8.

[0045] The following analyzes the forces on a dual-drive multi-rope friction hoisting system provided by the present invention suitable for hoisting large loads in ultra-deep wells:

[0046] The mass of the 8 balance tail ropes 7 of the present invention is equal to the sum of the masses of the 6 first hoisting headropes 5 and the 6 second hoisting headropes 6, that is: 2npH0 = n'qH0,

[0047] Where n is the number of the first hoisting headrope 5 and the second hoisting headrope 6; p is the mass per meter of the first hoisting headrope 5 and the second hoisting headrope 6, kg / m; H0 is the hanging length of the first hoisting headrope 5 and the second hoisting headrope 6, m; n' is the number of the balance tail ropes 7; q is the mass per meter of the balance tail ropes 7, kg / m.

[0048] The tensions of the first hoisting headrope 5 on both sides of the first friction wheel 1 are respectively:

[0049] S1 = (npH0 + 1 / 2Qr + 1 / 2Q) × g,

[0050] S2 = (1 / 2n'qH0 + 1 / 2Qr) × g,

[0051] Where Qr is the mass of the first hoisting container 8 and the second hoisting container 9, kg; Q is the mass of the effectively loaded goods, kg; g is the acceleration due to gravity.

[0052] The tension difference of the first hoisting headrope 5 on both sides of the first friction wheel 1 is:

[0053] S c1 = S1 - S2 = 1 / 2Q × g.

[0054] Similarly, the tensions of the second hoisting headrope 6 on both sides of the second friction wheel 2 are respectively:

[0055] S4 = (npH0 + 1 / 2Qr + 1 / 2Q) × g

[0056] S3 = (1 / 2n'qH0 + 1 / 2Qr) × g.

[0057] The tension difference of the second hoisting head rope 6 acting on both sides of the second friction wheel 2 is:

[0058] S c2 = S4 - S3 = 1 / 2Q×g.

[0059] Thus, the tension difference S of the first hoisting head rope 5 acting on both sides of the first friction wheel 1 c1 is equal to the tension difference S of the second hoisting head rope 6 acting on both sides of the second friction wheel 2 c2 , that is, S c1 = S c2 .

[0060] For the above force analysis, the tensions acting on the first friction wheel 1 and the second friction wheel 2 in the present invention are respectively half of the weight (S1 + S2 + S3 + S4) generated by the hoisting system. The tension differences acting on the first friction wheel 1 and the second friction wheel 2 are respectively half of the weight of the effectively loaded goods (1 / 2Q×g).

[0061] Example 1.

[0062] In this example, taking an underground mine with a scale of 2.5 million t / a as an example, assuming the hoisting height ranges from 1500 m to 2300 m, the hoisting speed is taken as 16 m / s, and the loose specific gravity of the loaded goods (ore) is 1.73 t / m 3 .

[0063] The first hoisting container 8 and the second hoisting container 9 are selected as double skip bins with a size of 14 m 3 to 17 m 3 . The self-weights of the first hoisting container 8 and the second hoisting container 9 are 30 t to 34 t, and the effective hoisting amount of the loaded goods (ore) is 20 t to 25 t. Six first hoisting head ropes 5 and six second hoisting head ropes 6 (a total of 12 ropes) are adopted. The diameters of the first hoisting head ropes 5 and the second hoisting head ropes 6 are from 32 mm to 62 m. Eight balance tail ropes 7 are adopted, and the diameters of the balance tail ropes 7 are from 40 mm to 82 mm. Two multi-rope friction hoisting machines with 6 ropes and a diameter of 3.5 m to 6.5 m are selected as the hoisting machines. The first driving unit and the second driving unit with a power of 2200 kW to 2700 kW are respectively configured for the two hoisting machines. The power imbalance coefficient of the multi-machine drive is taken as 0.95. Using existing equipment, the hoisting task can be completed within 19.5 h while the hoisting depth can reach 1500 m to 2300 m. The calculation results of the hoisting height that can reach 1500 m to 2300 m are shown in Table 1:

[0064] Table 1 Hoisting height that the present invention can reach in an underground mine with a scale of 2.5 million t / a

[0065]

[0066] Example 2.

[0067] In this embodiment, a 5-million-tons-per-year underground mine is taken as an example. It is assumed that the hoisting height ranges from 1500 m to 2100 m, the hoisting speed is taken as 16 m / s, and the loose specific gravity of the loading material (ore) is 1.73 t / m 3 .

[0068] The first hoisting container 8 and the second hoisting container 9 are selected as double skip buckets with a size of 27 m 3 to 33 m 3 . The self-weights of the first hoisting container 8 and the second hoisting container 9 are 41 t to 47.5 t, and the effective hoisting capacity of the loading material (ore) is 39 t to 48 t. Six first hoisting head ropes 5 and six second hoisting head ropes 6 (12 in total) are adopted. The diameters of the first hoisting head ropes 5 and the second hoisting head ropes 6 are 40 mm to 62 m. Eight balance tail ropes 7 are adopted, and the diameters of the balance tail ropes 7 are 50 mm to 80 mm. Two 6-rope multi-rope friction hoists with diameters ranging from 4 m to 6.5 m are selected for the hoist. The first drive unit and the second drive unit with powers of 4000 kW to 4900 kW are respectively configured for the two hoists. The power imbalance coefficient of the multi-machine drive is taken as 0.95. Using existing equipment, the hoisting task can be completed within 19.5 h while the hoisting depth reaches 1500 m to 2100 m. The calculation results of the hoisting height that can reach 1500 m to 2100 m are shown in Table 2:

[0069] Table 2 Hoisting Heights that can be Achieved by the Present Invention in a 5-million-tons-per-year Underground Mine

[0070]

[0071] In the first embodiment and the second embodiment, the existing domestic hoisting equipment level is adopted. The hoist is selected and designed according to the largest specification model of Φ6.5×6 multi-rope friction hoist. The hoisting system of the present invention is used for ultra-deep well and large-load hoisting, and the hoisting heights of 2300 m and 2100 m can be achieved. In some embodiments, if further imported hoists and wire ropes are selected, the hoisting height and hoisting capacity can be further increased.

[0072] The following points need to be explained:

[0073] (1) The attached drawings of the embodiments of the present invention only relate to the structures involved in the embodiments of the present invention, and other structures can refer to the general design.

[0074] (2) For clarity, in the attached drawings used to describe the embodiments of the present invention, the thickness of the layer or region is enlarged or reduced, that is, these attached drawings are not drawn according to the actual ratio. It can be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, the element can be "directly" on or under the other element or there can be an intermediate element.

[0075] (3) Without conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other to obtain new embodiments.

[0076] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A dual-drive multi-rope friction hoisting system suitable for ultra-deep well large-load hoisting, characterized in that, The hoisting system includes: a first friction wheel and a second friction wheel; The first friction wheel carries a first hoisting head rope. One end of the first hoisting head rope suspends a first hoisting container, and the other end of the first hoisting head rope suspends a second hoisting container; The second friction wheel carries a second hoisting head rope. One end of the second hoisting head rope bypasses a first head sheave to suspend the second hoisting container, and the other end of the second hoisting head rope bypasses a second head sheave to suspend the first hoisting container; The hoisting system further includes a balance tail rope. One end of the balance tail rope is suspended at the bottom of the first hoisting container, and the other end of the balance tail rope is suspended at the bottom of the second hoisting container; The balance tail rope freely hangs in the shaft to form a tail rope loop; The hoisting system further includes a first driving unit and a second driving unit. The first driving unit is the main drive and drives the first friction wheel in a variable frequency speed control mode; The second driving unit is the slave drive and drives the second friction wheel in a variable frequency speed control mode; The main drive is in a closed-loop speed control mode, and the slave drive is in a closed-loop torque control mode. The two driving units are interlocked through a control system.

2. The lifting system according to claim 1, wherein The first friction wheel, the first head sheave and the second head sheave are arranged on the shaft tower; The second friction wheel is arranged in the ground hoisting machine room.

3. The lifting system according to claim 1, wherein The number of the first hoisting head ropes is an even number, and the number of the second hoisting head ropes is an even number; The number of the first hoisting head ropes is the same as that of the second hoisting head ropes.

4. The lifting system according to claim 3, wherein The first hoisting head ropes are four or six, and the second hoisting head ropes are four or six.

5. The lifting system according to claim 4, characterized in that, The first hoisting head ropes are six, and the second hoisting head ropes are six; At the top of the first hoisting container, six first hoisting head ropes and six second hoisting head ropes are symmetrically arranged with respect to the first center line of the first hoisting container; At the top of the second hoisting container, six first hoisting head ropes and six second hoisting head ropes are symmetrically arranged with respect to the second center line of the second hoisting container.

6. The lifting system according to claim 5, wherein, The number of the balance tail ropes is eight, and the mass of the balance tail ropes is equal to the sum of the masses of the first hoisting head ropes and the second hoisting head ropes.

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