Industrial test method of high-specific-pressure and high-friction-coefficient liner for kilometer deep well

Abstract

The invention discloses an industrial test method of a high-specific-pressure and high-friction-coefficient liner for a kilometer deep well, and belongs to the technical field of mine hoist manufacturing. A no-load light-load side container is placed at a well mouth, a heavy-load side container is placed at a well bottom, a hoist is in a parking brake state, a steel beam is arranged in the light-load side container, the two ends of the steel beam are fixedly connected with the well mouth, and the two ends of the steel beam are fixedly connected with the well mouth; a jack is fixedly arranged on the steel beam, and an output shaft of the jack abuts against the top plate of the light-load side container. The jack is used for jacking to reduce the tension of the steel wire rope on one side of the light-load side container, so that the steel wire rope slides on the friction liner to obtain the thrust of the jack at the moment of sliding. Acquiring tension data of two ends of the steel wire rope according to the thrust of the jack, the heavy-load side container self-weight, the light-load side container self-weight, the load self-weight and the steel wire rope self-weight. The friction coefficient of the liner is obtained according to tension data at two ends of the steel wire rope. The test equipment construction threshold is low, a test scene is close to a real scene, test data is easy and convenient to obtain, and good practicability is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of mine hoist manufacturing, and in particular relates to an industrial test method for a high specific pressure and high friction coefficient liner for a kilometer-deep well. Background Art

[0002] Mine hoists are the throat equipment of mines, mainly used to lift or lower personnel, equipment and ores in coal mines, metal mines and non-metallic mines. The friction pad is fixed on the outer side of the hoist drum, the wire rope is overlapped on the friction pad, and a container is hung at each end of the wire rope, one for the light load side and the other for the heavy load side. The multi-rope friction hoist uses the friction between the wire rope and the friction pad to transmit power. The friction coefficient of the friction pad is directly related to the lifting capacity, working efficiency and safety and reliability of the friction hoist.

[0003] With the rapid increase in demand for mineral resources in economic and social development, deep shaft and large-tonnage mine hoisting equipment has become the current trend of industry development. Friction pads are key components of deep shaft and large-tonnage mine hoists. The material has gone through the development process of polyvinyl chloride-polyurethane-new composite materials, and the design value of the friction coefficient has been increased from the initial 0.20 to the current 0.25. Conventional laboratory testing methods can only detect the friction coefficient of the pad under static conditions, and cannot truly reflect the friction coefficient under various working conditions during on-site operation. Therefore, it is urgent to develop an industrial test method for high-specific pressure and high-friction coefficient pads suitable for kilometer-deep well conditions. Summary of the invention

[0004] The present invention provides an industrial test method for high specific pressure and high friction coefficient pads for kilometer-deep wells, which can test the maximum friction coefficient value of the friction pads in actual use, solves the difficult problem of on-site detection of the friction coefficient of the friction pads, and provides technical support for the development of high specific pressure and high friction coefficient pads for deep shafts and large-tonnage mine hoists.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] An industrial test method for a high specific pressure and high friction coefficient liner for a kilometer deep well is implemented by a multi-rope friction hoist. The friction liner of the hoist is fixed on a friction wheel by a fixing block and a pressing block. The hoist uses the friction between the friction liner and the wire rope to drive the wire rope. The two ends of the wire rope are respectively hung with a light load test container and a heavy load side container. The industrial test of the method includes:

[0007] The empty light-load side container is placed at the wellhead, the heavy-load side container is placed at the well bottom, and the hoist is in parking brake state;

[0008] A steel beam is arranged in the light-load side container, and both ends of the steel beam are fixedly connected to the wellhead; a jack is fixedly arranged on the steel beam, and the output shaft of the jack abuts against the top plate of the light-load side container;

[0009] Using the jack to push up to reduce the tension of the steel wire rope on one side of the light-load side container, so that the steel wire rope slides on the friction pad;

[0010] Obtaining the thrust of the jack at the moment of sliding;

[0011] Obtaining tension data at both ends of the steel wire rope according to the thrust of the jack, the deadweight of the heavy-load side container, the deadweight of the light-load side container, the deadweight of the load, and the deadweight of the steel wire rope;

[0012] The friction coefficient of the friction pad is obtained according to the tension data at both ends of the steel wire rope.

[0013] Furthermore, a load sensor is arranged between the output shaft of the jack and the top plate of the light-load side container, and the load sensor is used to obtain the thrust of the jack.

[0014] Furthermore, the method for obtaining the tension data at both ends of the wire rope includes: the tension data at both ends of the wire rope are respectively expressed as T1 and T2, then T1=GQ1+GZ+GS1, T2=GQ2+GS2-N, wherein T1 is the tension of the wire rope on the heavy-load side container side, T2 is the tension of the wire rope on the light-load side container side, GQ1 is the dead weight of the heavy-load side container, GQ2 is the dead weight of the light-load side container, GZ is the dead weight of the load, GS1 is the dead weight of the wire rope on the heavy-load side container side, GS2 is the dead weight of the wire rope on the light-load side container side, and N is the jack thrust.

[0015] Furthermore, the method for obtaining the tension data at both ends of the steel wire rope also includes: performing multiple tests, and taking the average value of the tension data at both ends of the steel wire rope during the multiple tests as the final tension data at both ends of the steel wire rope.

[0016] Furthermore, the method for obtaining the friction coefficient of the friction pad according to the tension data at both ends of the wire rope includes: Wherein α is the wrapping angle, T1 is the tension data of the steel wire rope at the side of the light-load side container, and T2 is the tension data of the steel wire rope at the side of the light-load side container.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) The friction wheel of the hoist is locked, so there is no need to consider the state of the wire rope when the friction wheel rotates, which simplifies the test difficulty;

[0019] 2) The test uses existing operating scenarios to build equipment, and the test equipment is easy to obtain;

[0020] 3) The test method is in line with the actual use environment and can detect the friction coefficient under the influence of various working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the hoist used in the present invention;

[0022] Figure 2 It is a schematic diagram of the industrial test method in the present invention.

[0023] Among them, 1-friction wheel, 2-steel wire rope, 3-friction pad, 4-fixed block, 5-pressure block, 6-light load side container, 7-heavy load side container, 8-steel beam, 9-jack, 10-load sensor. DETAILED DESCRIPTION

[0024] In order to better understand the present invention, the content of the present invention is further clearly set forth in conjunction with the embodiments below, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are provided in order to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0025] In the following description, the terms "upper", "lower", "horizontal", "top", "side", "far", "near", "inside" and "outside" indicating directions or positional relationships are used only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms such as "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Example

[0028] See also Figure 1 and Figure 2 , an industrial test method for high specific pressure and high friction coefficient lining for kilometer deep wells, the evaluation method comprises the following steps: Figure 1As shown, the multi-rope friction hoist is arranged in the machine room, and a friction pad 3 is installed on the friction wheel 1. The friction pad 3 is fixed to the friction wheel 1 through a fixing block 4 and a pressing block 5. The wire rope 2 is placed on the rope groove of the friction pad 3, and a lifting container (a light load side container 6 and a heavy load side container 7 respectively) is hung at each end. The friction force between the friction pad 3 and the wire rope 2 is used to drive the wire rope 2 to move the lifting container up and down.

[0029] As attached Figure 2 As shown, a horizontal steel beam 8 is arranged in the light-load side container 6, and the steel beam 8 is fixed at the wellhead to play a supporting role; a jack 9 is placed on the steel beam 8 to apply external force; the output shaft of the jack 9 is vertically upward, and a load sensor 10 is arranged between the output shaft of the jack 9 and the top plate of the light-load side container 6 to read the force value of the jack.

[0030] An industrial test method for a high specific pressure and high friction coefficient liner for a kilometer deep well comprises the following steps:

[0031] Step 1: Place the light-load side container 6 at the wellhead, the heavy-load side container 7 at the bottom of the well, and the hoist is in the parking brake state;

[0032] Step 2: The light-load side container 6 is unloaded, and a jack is used to lift up to reduce the tension of the steel wire rope 2 on one side of the light-load side container 6, so that the steel wire rope 2 slides on the friction pad 3;

[0033] Step 3: Measure the thrust N of the jack 9 in the light-load side container 6 at the moment of sliding;

[0034] Step 4: The wire rope tension T1 of the heavy-loaded container 7 can be calculated based on the container's deadweight GQ1, the load's deadweight GZ and the heavy-loaded deadweight GS1 of the wire rope 2. The wire rope tension T2 of the light-loaded container 6 can be calculated based on the container's deadweight GQ2, the light-loaded deadweight GS2 of the wire rope 2 and the thrust N of the jack 9. Specifically:

[0035] T1=GQ1+GZ+GS1 (1)

[0036] T2=GQ2+GS2―N (2)

[0037] Step 5: Conduct multiple tests, record the tension of the steel wire rope 2 on both sides of the friction wheel 1 during multiple sets of sliding, and take the average value of multiple tests as the final tension of the steel wire rope 2 on both sides of the friction wheel 1.

[0038]

[0039] Where: T 1i is the wire rope tension on the i-th group of heavy load side, T 2i is the wire rope tension on the light-load side of the i-th group, and n is the number of tests.

[0040] Finally, the friction coefficient between the friction pad 3 and the wire rope 2 during sliding is calculated according to the Euler formula, which is:

[0041]

[0042] Where: μ is the friction coefficient, α is the wrap angle.

[0043] Finally, it should be noted that the above embodiments are only preferred embodiments of the present invention, which are only used to illustrate the technical solution of the present invention rather than to limit it. Any modification, improvement, other modification or equivalent replacement made to the technical solution of the present invention by ordinary technicians in this field, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be included in the protection scope of the present invention.

Claims

1. An industrial test method for high specific pressure and high friction coefficient pads for kilometer-deep wells, which is implemented by using a multi-rope friction hoist. The friction pad (3) of the hoist is fixed on the friction wheel (1) through a fixing block (4) and a pressure block (5). The hoist uses the friction between the friction pad (3) and the wire rope (2) to drive the wire rope (2). The two ends of the wire rope (2) are respectively hung with a light load test container (6) and a heavy load side container (7). The method is characterized in that: include: The empty light-load side container (6) is placed at the wellhead, and the heavy-load side container (7) is placed at the bottom of the well, and the hoist is in a parking brake state; A steel beam (8) is arranged in the light-load side container (6), and both ends of the steel beam (8) are fixedly connected to the wellhead; a jack (9) is fixedly arranged on the steel beam (8), and the output shaft of the jack (9) abuts against the top plate of the light-load side container (6); Using the jack (9) to push up to reduce the tension of the steel wire rope (2) on the side of the light-load side container (6), so that the steel wire rope (2) slides on the friction pad (3); Obtaining the thrust of the jack (9) at the moment of sliding; Obtaining tension data at both ends of the steel wire rope (2) based on the thrust of the jack (9), the deadweight of the heavy-load side container (7), the deadweight of the light-load side container (6), the deadweight of the load, and the deadweight of the steel wire rope (2); The friction coefficient of the friction pad (3) is obtained based on the tension data at both ends of the steel wire rope (2).

2. The industrial test method of high specific pressure and high friction coefficient liner for kilometer deep well according to claim 1 is characterized in that: A load sensor (10) is arranged between the output shaft of the jack (9) and the top plate of the light-load side container (6), and the load sensor (10) is used to obtain the thrust of the jack (9).

3. The industrial test method of high specific pressure and high friction coefficient liner for kilometer deep well according to claim 1 is characterized in that: The method for obtaining the tension data at both ends of the steel wire rope (2) comprises: the tension data at both ends of the steel wire rope (2) are respectively expressed as T1 and T2, then T1=GQ1+GZ+GS1, T2=GQ2+GS2-N, wherein T1 is the tension of the steel wire rope (2) on the side of the heavy-load side container (7), T2 is the tension of the steel wire rope (2) on the side of the light-load side container (6), GQ1 is the deadweight of the heavy-load side container (7), GQ2 is the deadweight of the light-load side container (6), GZ is the deadweight of the load, GS1 is the deadweight of the steel wire rope (2) on the side of the heavy-load side container (7), GS2 is the deadweight of the steel wire rope (2) on the side of the light-load side container (6), and N is the thrust of the jack (9).

4. The industrial test method of high specific pressure and high friction coefficient liner for kilometer deep well according to claim 3 is characterized in that: The method for obtaining the tension data at both ends of the steel wire rope (9) further comprises: performing multiple tests, and taking the average value of the tension data at both ends of the steel wire rope (9) during the multiple tests as the final tension data at both ends of the steel wire rope (9).

5. The industrial test method of high specific pressure and high friction coefficient liner for kilometer deep well according to claim 1, characterized in that: The method for obtaining the friction coefficient of the friction pad (3) according to the tension data at both ends of the steel wire rope (9) comprises: Wherein α is the wrapping angle, T1 is the tension data of the steel wire rope (2) located on the side of the light-load side container (6), and T2 is the tension data of the steel wire rope (2) located on the side of the light-load side container (6).

Images