Rope loosening protection device for single-rope winding type hoister

Abstract

The utility model relates to the field of hoists, and particularly discloses a rope loosening protection device for a single-rope winding type hoister. By arranging the head sheave, the two main steel wire ropes, the counterweight iron, the skip bucket and the protection device, the counterweight iron and the skip bucket synchronously move and are opposite in lifting direction, although the counterweight iron and the skip bucket can drive the thin steel wire rope to move in the lifting process, the length of the thin steel wire rope cannot be changed, and the safety of the elevator is improved. When descending of the skip bucket is hindered, the main lifting steel wire rope becomes loose, the counterweight iron is matched with the skip bucket to ascend, the thin steel wire rope between the skip bucket and the counterweight iron also becomes loose, and the counterweight block drives the thin steel wire rope to fall downwards. The falling thin steel wire rope drives the balancing weight to trigger the travel switch, a circuit is closed, a switch signal is transmitted to an operation table PLC through the circuit, and a PLC safety circuit executes emergency stopping and alarming after receiving the signal.

Description

Technical Field

[0001] The utility model belongs to the technical field of hoists, and in particular relates to a single-rope winding hoist loose rope protection device. Background Art

[0002] The loose rope protection of the single-rope winding hoist is widely used in shaft hoisting operations for a long time. Generally, proximity switches or travel switches are used to control the action of the safety circuit. The single-rope winding hoist includes a winch, a sheave, a bucket and a wire rope. The length of the wire rope from the winch to the sheave is defined as the chord length, the length of the wire rope from the sheave to the bucket is defined as the vertical height, the distance from the sheave to the ground is the derrick height, and the length of the wire rope from the ground to the bucket is defined as the protection length. When descending, the lifting container is obstructed, and the vertical component of the wire rope chord length under the action of gravity will exceed the gravity of the suspended wire rope itself, causing the wire rope to become loose. When the degree of slackness of the wire rope reaches the rope window, the loose rope protection system can truly play a protective role. However, when the vertical component of the gravity acting on the wire rope chord is smaller than the gravity of the suspended wire rope itself, the downward movement of the lifting container is hindered and the main lifting wire rope becomes loose. The wire rope chord part will not relax and sag and cannot touch the travel switch or proximity switch, and the safety circuit will not take corresponding action. The loose rope protection system will not play a protective role, resulting in excessive loose rope, resulting in safety accidents such as rope breakage and bucket jamming.

[0003] In the Chinese patent with the publication number CN210973449U, the technical field of safety protection of mine hoisting equipment is mentioned, and a single rope winding hoist loose rope protection device is disclosed, including a detection window, a guide rail, a roller, a sliding rod, and an inductive proximity switch; a detection window is arranged between the hoist drum and the top wheel, the guide rail is horizontally placed in the middle and upper part of the detection window and is perpendicular to the wire rope, a roller is arranged on the guide rail, the top of two non-metallic sliding rods are connected to the roller, an inductive proximity switch is installed between the two sliding rods, the wire rope passes between the two sliding rods, the distance between the two sliding rods matches the wire rope, the inductive proximity switch is located below the wire rope, and the inductive proximity switch is connected to the hoist drum control device. The advantages of this utility model are: reducing the influence of rain, snow and light, and having strong anti-interference performance; through the design of the guide rail sliding rod, the proximity switch and the wire rope are kept synchronous; the position of the wire rope is detected by the linkage of the upper and lower proximity switches, so as to improve the accuracy of detection and prevent misjudgment.

[0004] During the application process, the applicant discovered that the above application had defects during use. The application was to pass the wire rope between two inductive proximity switches, and determine the position of the wire rope through the linkage of the two inductive proximity switches, and then determine the tightness of the wire rope. However, the use environment of the inductive proximity switch is relatively strict. It is not conducive to the use of inductive proximity switches in mining areas with a lot of dust and poor environment. Moreover, the protection device disclosed in the application is still unable to determine whether the protective length wire rope is loose. Utility Model Content

[0005] The utility model aims to provide a single-rope winding hoist loose rope protection device to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A single-rope winding hoist loose rope protection device, comprising:

[0008] A derrick, the derrick comprising a main beam and a secondary beam arranged below the main beam;

[0009] A sky wheel, wherein two sky wheels are provided and the two sky wheels are rotatably connected to the main beam;

[0010] A first main steel wire rope, the first main steel wire rope is rotatably connected to one of the sheaves, and a counterweight iron is fixedly connected to an end of the first main steel wire rope;

[0011] A second main steel wire rope, the second main steel wire rope is rotatably connected to the other of the sky sheaves, and the end of the second main steel wire rope is fixedly connected to a bucket;

[0012] A protection device is arranged on the secondary beam.

[0013] Preferably, the first main steel wire rope and the second main steel wire rope are raised and lowered synchronously, and in opposite directions.

[0014] Preferably, the protection device includes two groups of fixed pulleys arranged on the secondary beam, the two groups of fixed pulleys are rotatably connected with thin steel wire ropes, the two ends of the thin steel wire ropes are respectively fixedly connected to the counterweight iron and the bucket, the thin steel wire rope is rotatably connected with a movable pulley located between the two groups of fixed pulleys, the bottom of the movable pulley is fixedly connected with a counterweight block, and a travel switch is arranged below the counterweight block.

[0015] Preferably, the travel switch is arranged on the derrick, and the counterweight block and the travel switch are arranged vertically up and down.

[0016] Preferably, each group of the fixed pulleys includes two fixed pulleys, and the two fixed pulleys are horizontally arranged on the secondary beam.

[0017] Preferably, a sliding distance is left between the counterweight block and the travel switch.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model is provided with a sky wheel, two main steel wire ropes, a counterweight, a bucket and a protective device, the counterweight and the bucket, the counterweight and the bucket move synchronously, and the lifting directions are opposite. Since the counterweight and the bucket lift in opposite directions and move synchronously, the thin steel wire rope between the counterweight and the bucket cannot be deformed. Although the counterweight and the bucket can drive the thin steel wire rope to move during the lifting process, the length of the thin steel wire rope cannot be changed. Therefore, the position of the movable pulley arranged on the thin steel wire rope is fixed, and the distance between the counterweight and the travel switch remains unchanged. When the bucket is hindered from descending, the main lifting steel wire rope becomes loose, the counterweight cooperates with the bucket to rise, and the thin steel wire rope between the bucket and the counterweight also becomes loose, and the counterweight drives the thin steel wire rope to fall downward, and the falling thin steel wire rope drives the counterweight to trigger the travel switch, completing a closed circuit, and transmitting the switch signal to the operating table PLC through the circuit. After receiving the signal, the PLC safety circuit executes emergency stop and alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the protection device of the utility model;

[0021] In the figure: 1. main beam; 2. secondary beam; 3. crown wheel; 4. fixed pulley; 5. first main steel wire rope; 6. second main steel wire rope; 7. thin steel wire rope; 8. movable pulley; 9. counterweight block; 10. travel switch; 11. counterweight iron; 12. bucket. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Example:

[0024] See also Figure 1 As shown, a single-rope winding hoist loose rope protection device comprises:

[0025] A derrick, the derrick comprising a main beam 1 and a secondary beam 2 arranged below the main beam 1;

[0026] A sky wheel 3, wherein two sky wheels 3 are provided, and the two sky wheels 3 are rotatably connected to the main beam 1;

[0027] A first main steel wire rope 5, wherein the first main steel wire rope 5 is rotatably connected to one of the sheaves 3, and a counterweight iron 11 is fixedly connected to an end of the first main steel wire rope 5;

[0028] A second main steel wire rope 6, wherein the second main steel wire rope 6 is rotatably connected to the other of the sky sheaves 3, and the end of the second main steel wire rope 6 is fixedly connected to a bucket 12;

[0029] The first main steel wire rope 5 and the second main steel wire rope 6 are raised and lowered synchronously, and in opposite directions;

[0030] A protection device is arranged on the secondary beam 2 .

[0031] It can be seen from the above that the user can control the movement of the counterweight 11 and the bucket 12 through the first main steel wire rope 5 and the second main steel wire rope 6. When the second main steel wire rope 6 becomes loose due to the obstruction of the movement of the bucket 12, the protection device can promptly identify the loosening of the main steel wire rope, so that the user can promptly discover the loosening of the main steel wire rope and realize emergency stop and alarm.

[0032] The protection device includes two groups of fixed pulleys 4 arranged on the secondary beam 2, each group of the fixed pulleys 4 includes two fixed pulleys 4, and the two fixed pulleys 4 are horizontally arranged on the secondary beam 2, the two groups of the fixed pulleys 4 are rotatably connected with thin steel wire ropes 7, the two ends of the thin steel wire ropes 7 are respectively fixedly connected to the counterweight iron 11 and the bucket 12, the thin steel wire ropes 7 are rotatably connected with a movable pulley 8 located between the two groups of fixed pulleys 4, the bottom of the movable pulley 8 is fixedly connected with a counterweight block 9, a travel switch 10 is arranged below the counterweight block 9, and a sliding gap is left between the counterweight block 9 and the travel switch 10.

[0033] The travel switch 10 is arranged on the derrick, and the counterweight block 9 and the travel switch 10 are arranged vertically up and down.

[0034] From the above, it can be seen that when the movement of the skip 12 is obstructed and the second main steel wire rope 6 becomes loose, the first main steel wire rope 5 still drives the counterweight iron 11 upward. At this time, the thin steel wire rope 7 between the counterweight iron 11 and the skip 12 also becomes loose, and the counterweight block 9 drives the thin steel wire rope 7 downward. The downward counterweight block 9 will resist the travel switch 10, completing the closed circuit. The circuit transmits the switch signal to the operating console PLC, and the PLC safety circuit executes emergency stop and alarm after receiving the signal.

[0035] The standard parts used in this utility model can be purchased from the market, and the special-shaped parts can be customized according to the description and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0036] In the description of the present utility model, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. The meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection 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.

[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0040] In the drawings of the embodiments disclosed in the present utility model, only the structures related to the embodiments disclosed in the present utility model are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present utility model can be combined with each other.

Claims

1. A single-rope winding hoist loose rope protection device, characterized in that: include: A derrick, the derrick comprising a main beam (1) and a secondary beam (2) arranged below the main beam (1); A sky wheel (3), wherein two sky wheels (3) are provided, and the two sky wheels (3) are rotatably connected to the main beam (1); A first main steel wire rope (5), the first main steel wire rope (5) being rotatably connected to one of the sheaves (3), and a counterweight iron (11) being fixedly connected to an end of the first main steel wire rope (5); A second main steel wire rope (6), the second main steel wire rope (6) being rotatably connected to the other of the sky wheels (3), and the end of the second main steel wire rope (6) being fixedly connected to a bucket (12); A protection device is provided on the secondary beam (2).

2. A single-rope winding hoist loose rope protection device according to claim 1, characterized in that: The first main steel wire rope (5) and the second main steel wire rope (6) are raised and lowered synchronously, and in opposite directions.

3. A single-rope winding hoist loose rope protection device according to claim 2, characterized in that: The protection device comprises two groups of fixed pulleys (4) arranged on the secondary beam (2), the two groups of fixed pulleys (4) are rotatably connected with thin steel wire ropes (7), the two ends of the thin steel wire ropes (7) are respectively fixedly connected to the counterweight iron (11) and the bucket (12), the thin steel wire ropes (7) are rotatably connected with a movable pulley (8) located between the two groups of fixed pulleys (4), the bottom of the movable pulley (8) is fixedly connected with a counterweight block (9), and a travel switch (10) is arranged below the counterweight block (9).

4. A single-rope winding hoist loose rope protection device according to claim 3, characterized in that: The travel switch (10) is arranged on the derrick, and the counterweight block (9) and the travel switch (10) are arranged vertically up and down.

5. A single-rope winding hoist loose rope protection device according to claim 4, characterized in that: Each group of fixed pulleys (4) comprises two fixed pulleys (4), and the two fixed pulleys (4) are horizontally arranged on the secondary beam (2).

6. A single-rope winding hoist loose rope protection device according to claim 5, characterized in that: A sliding distance is left between the counterweight block (9) and the travel switch (10).

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