Crown block fixed pulley anti-falling and alarm device

Abstract

The utility model relates to an anti-falling and alarm device for a crown block fixed pulley, and belongs to the technical field of engineering cost auxiliary equipment. According to the technical scheme, a left guide pulley and a right guide pulley are installed on the two sides of the lower portion of a trolley platform respectively; the steel wire rope is in tangent contact with the left guide pulley groove and the right guide pulley groove respectively; the photoelectric emission switch and the photoelectric receiving switch are respectively arranged on the outer sides of the left guide pulley and the right guide pulley, the photoelectric receiving switch is connected with the photoelectric relay, and the photoelectric relay, the groove separation alarm relay and the groove separation alarm buzzer are sequentially connected. The beneficial effects of the utility model are that the guide pulley and the detection element are installed below the trolley platform, the steel wire rope is limited between the fixed pulley groove and the guide pulley groove, the degree of freedom of the steel wire rope is reduced, the difficulty of the steel wire rope separating from the groove is improved, and once the steel wire rope is separated from the groove, a warning signal is given to an operator, so that the safety of the operator is ensured. Therefore, operation accidents are greatly avoided, and the safety of equipment and personnel is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of sky crane fixed pulley anti-drop and alarm device, belong to engineering cost auxiliary equipment technical field. BACKGROUND

[0002] Sky crane is a kind of special equipment that is used in large quantities in industrial and mining enterprises, responsible for the transmission of internal materials of enterprise, due to the uneven level of sky crane operator, often appears in actual operation skewing, causes sky crane fixed pulley to drop groove, if cannot be found in time, will cause the damage of pulley and steel wire rope, seriously endanger personnel and equipment safety.The actual situation in the field is that some high span, auxiliary operation sky crane is controlled by remote control, remote control operation is carried out by operator on ground.For example, the 50T, 20T sky crane of converter in steel plant is installed in 57m high span platform, the lifting height of sky crane normal work is more than 50m, once skewing fixed pulley drops groove, ground personnel is difficult to find, continue to operate, may cause accident.The traditional design, a protective cover is installed on the upper part of fixed pulley, in actual use, the force of steel wire rope is very large in skewing moment, can be squeezed out from the gap of protective cover and pulley, protective cover basically cannot play the role of anti-drop.Handbao steel plant has nine remote control sky cranes, how to ensure operation safety, is worth considering.A kind of anti-drop device needs to be considered to enhance the anti-drop ability, at the same time, once fixed pulley drops groove, can send warning signal in first time, reminds operator fixed pulley drops groove, to avoid accident. SUMMARY

[0003] The utility model aims at providing a kind of sky crane fixed pulley anti-drop and alarm device, by installing guide pulley and detection element below trolley platform, limit steel wire rope between fixed pulley wheel groove and guide pulley wheel groove, reduce the degree of freedom of steel wire rope, improve the difficulty of steel wire rope to drop groove, once drop groove, also give warning signal to operator, to greatly avoid operation accident, ensure equipment and personnel safety, solve the above problems existing in background art.

[0004] The utility model discloses a technical scheme is: a kind of crown block fixed pulley anti -slipping and alarm device, including fixed pulley, left guide pulley, right guide pulley, photoelectric emission switch, photoelectric receiving switch, photoelectric relay, groove alarm relay and groove alarm buzzer, the fixed pulley is installed in the middle position below trolley platform, left guide pulley and right guide pulley are respectively installed in the position below trolley platform two sides;Steel wire rope is respectively tangent contact with left guide pulley wheel groove and right guide pulley wheel groove, and steel wire rope is limited between fixed pulley wheel groove and the wheel groove of left guide pulley and between fixed pulley wheel groove and the wheel groove of right guide pulley;Photoelectric emission switch and photoelectric receiving switch are respectively installed in the outside of left guide pulley and right guide pulley, and the position of photoelectric emission switch and photoelectric receiving switch is matched, and photoelectric receiving switch is connected photoelectric relay, and photoelectric relay, groove alarm relay and groove alarm buzzer are sequentially connected.

[0005] Still include fixed pulley support, left guide pulley support and right guide pulley support, the fixed pulley is fixed together with trolley platform after being connected by fixed pulley pivot and fixed pulley support;Left guide pulley is fixed below left side of trolley platform after being connected by left guide pulley pivot and left guide pulley support;Right guide pulley is fixed below right side of trolley platform after being connected by right guide pulley pivot and right guide pulley support.

[0006] The angle between the center line of the left guide pulley and the right guide pulley and the center line of the fixed pulley is 135 degrees.

[0007] The number of pulley pieces of the left guide pulley, the right guide pulley and the fixed pulley is consistent, one-to-one correspondence, and on the same straight line.

[0008] The utility model has the advantages that by installing guide pulley and detection element below trolley platform, steel wire rope is limited between fixed pulley wheel groove and guide pulley wheel groove, the freedom of steel wire rope is reduced, the difficulty of steel wire rope groove is improved, once groove, warning signal is given to operator, so that operation accident is greatly avoided, and equipment and personnel safety are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is the guide pulley part of the utility model overhead view;

[0010] Figure 2 It is the guide pulley part side view of the utility model;

[0011] Figure 3 It is the detection circuit diagram of the utility model;

[0012] In the figure: fixed pulley 1, left guide pulley rotating shaft 2, left guide pulley 3, left first photoelectric emission switch 4, left second photoelectric emission switch 5, left second guide pulley piece 6, left third photoelectric emission switch 7, left third pulley gap 8, left fourth photoelectric emission switch 9, fixed pulley rotating shaft 10, right guide pulley rotating shaft 11, right guide pulley 12, right first photoelectric receiving switch 13, right second photoelectric receiving switch 14, right third photoelectric receiving switch 15, right fourth photoelectric receiving switch 16, fixed pulley support 17, trolley platform 18, outer edge of a pulley piece wheel groove of the fixed pulley 19, left guide pulley support 20, left third guide pulley piece wheel groove 21, outer edge of the left third guide pulley piece 22, steel wire rope 23, right guide pulley support 24, right third guide pulley piece wheel groove 25, outer edge of the right third guide pulley piece 26, outer edge of a pulley piece wheel groove of the fixed pulley 27, right fourth photoelectric relay normally closed contact 28, right third photoelectric relay normally closed contact 29, right second photoelectric relay normally closed contact 30, right first photoelectric relay normally closed contact 31, right fourth photoelectric receiving switch normally open contact 32, right third photoelectric receiving switch normally open contact 33, right second photoelectric receiving switch normally open contact 34, right first photoelectric receiving switch normally open contact 35, off-groove alarm relay 36, right fourth photoelectric relay 37, right third photoelectric relay 38, right second photoelectric relay 39, right first photoelectric relay 40, off-groove alarm relay normally open contact 41, off-groove alarm buzzer 42. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0014] The device contains a fixed pulley 1, a left guide pulley 3, a right guide pulley 12, a photoelectric emission switch, a photoelectric receiving switch, a photoelectric relay, a slot escape alarm relay 36 and a slot escape alarm buzzer 42. The fixed pulley 1 is installed in the middle position below the trolley platform 18. The left guide pulley 3 and the right guide pulley 12 are respectively installed in the two side positions below the trolley platform 18. The steel wire rope 23 is respectively tangent to the left guide pulley groove and the right guide pulley groove. The steel wire rope 23 is limited between the fixed pulley groove and the left guide pulley groove and between the fixed pulley groove and the right guide pulley groove. The photoelectric emission switch and the photoelectric receiving switch are respectively installed on the outside of the left guide pulley 3 and the right guide pulley 12. The positions of the photoelectric emission switch and the photoelectric receiving switch are matched. The photoelectric receiving switch is connected with the photoelectric relay. The photoelectric relay, the slot escape alarm relay 36 and the slot escape alarm buzzer 42 are connected in sequence.

[0015] The device also contains a fixed pulley support 17, a left guide pulley support 20 and a right guide pulley support 24. The fixed pulley 1 is connected with the fixed pulley support 17 through the fixed pulley rotating shaft 10 and is fixed with the trolley platform 18. The left guide pulley 3 is connected with the left guide pulley support 20 through the left guide pulley rotating shaft 2 and is fixed below the left side of the trolley platform 18. The right guide pulley 12 is connected with the right guide pulley support 24 through the right guide pulley rotating shaft 11 and is fixed below the right side of the trolley platform 18.

[0016] The angle between the line connecting the center of the pulley piece of the left guide pulley 3 and the right guide pulley 12 and the center of the pulley piece of the fixed pulley 1 and the trolley platform 18 is 135 degrees.

[0017] The number of the pulley pieces of the left guide pulley 3, the right guide pulley 12 and the fixed pulley 1 is consistent, one-to-one corresponding and on the same straight line.

[0018] In practical application, the number of the pulley pieces of the left guide pulley 3, the right guide pulley 12 and the fixed pulley 1 is consistent, one-to-one corresponding and on the same straight line.

[0019] The left guide pulley 3 is connected with the left guide pulley support 20 through the left guide pulley rotating shaft 2 and is fixed below the trolley platform 18. The right guide pulley 12 is connected with the right guide pulley support 24 through the right guide pulley rotating shaft 11 and is fixed below the trolley platform 18. The fixed pulley 1 is connected with the fixed pulley support 17 through the fixed pulley rotating shaft 10 and is fixed with the trolley platform 18. The left part of the steel wire rope 23 is limited between the outer one pulley piece groove 27 of the fixed pulley and the left three guide pulley piece groove 21 in the outer one pulley piece groove 27 of the fixed pulley. The right part of the steel wire rope 23 is limited between the outer one pulley piece groove 27 of the fixed pulley and the right three guide pulley piece groove 25 in the right three guide pulley piece groove 25.

[0020] The photoelectric emission switch comprises a left first photoelectric emission switch 4, a left second photoelectric emission switch 5, a left third photoelectric emission switch 7 and a left fourth photoelectric emission switch 9, the photoelectric receiving switch comprises a right first photoelectric receiving switch 13, a right second photoelectric receiving switch 14, a right third photoelectric receiving switch 15 and a right fourth photoelectric receiving switch 16, the optical cable relay comprises a right fourth photoelectric relay 37, a right third photoelectric relay 38, a right second photoelectric relay 39 and a right first photoelectric relay 40, the left first photoelectric emission switch 4 and the right first photoelectric receiving switch 13 are in a straight line, the left second photoelectric emission switch 5 and the right second photoelectric receiving switch 14 are in a straight line, the left third photoelectric emission switch 7 and the right third photoelectric receiving switch 15 are in a straight line, and the left fourth photoelectric emission switch 9 and the right fourth photoelectric receiving switch 16 are in a straight line; the right first photoelectric receiving switch common-open contact 35 is connected with the right first photoelectric relay coil 40; the right second photoelectric receiving switch common-open contact 34 is connected with the right second photoelectric relay coil 39; the right third photoelectric receiving switch common-open contact 33 is connected with the right third photoelectric relay coil 38; the right fourth photoelectric receiving switch common-open contact 32 is connected with the right fourth photoelectric relay coil 37; the right first photoelectric relay common-closed contact 31, the right second photoelectric relay common-closed contact 30, the right third photoelectric relay common-closed contact 29 and the right fourth photoelectric relay common-closed contact 28 are connected with the off-slot alarm relay coil 36 in parallel, and the off-slot alarm relay common-open contact 41 is connected with the off-slot alarm buzzer 42.

[0021] The working process of the utility model is as follows:

[0022] During the operation of the crown block, when the steel wire rope of the hoisting mechanism is obliquely pulled, taking the outer pulley piece of the fixed pulley as an example, the working processes of other pulley pieces are the same. The steel wire rope 23 is constrained by the left third guide pulley piece wheel groove 21, the outer pulley piece wheel groove 27 of the fixed pulley, the right third guide pulley piece wheel groove 25 and the outer pulley piece wheel groove 27 of the fixed pulley, and the freedom of swinging in the southeast, northeast and northwest directions is limited, and at the same time, a tightening action towards the center of the fixed pulley 1 is generated, thereby preventing the fixed pulley 1 from being off-slot.

[0023] Once the extreme situation occurs and the steel wire rope 23 is off-slot, it is assumed that the steel wire rope 23 is off-slot outwardly between the outer pulley piece wheel groove 27 of the fixed pulley and the fixed pulley support 17, the photoelectric signal emitted by the left fourth photoelectric emission switch 9 is blocked by the steel wire rope 23, the right fourth photoelectric receiving switch 16 acts, the right fourth photoelectric receiving switch common-open contact 32 is disconnected, the right fourth photoelectric relay 37 loses electricity, the right fourth photoelectric relay common-closed contact 28 is closed, the off-slot alarm relay 36 obtains electricity, and the off-slot alarm buzzer 42 emits a buzzing warning to prompt the operator of the crown block that the fixed pulley is off-slot. The steel wire rope 23 is off-slot inwardly, and the action process is similar.

Claims

1. A device for preventing the fixed pulley of an overhead crane from slipping off and for issuing an alarm, characterized in that: It comprises a fixed pulley (1), a left guide pulley (3), a right guide pulley (12), a photoelectric emission switch, a photoelectric receiving switch, a photoelectric relay, a off-track alarm relay (36) and a off-track alarm buzzer (42), the fixed pulley (1) is installed in the middle position below the trolley platform (18), the left guide pulley (3) and the right guide pulley (12) are respectively installed in the two side positions below the trolley platform (18); the steel wire rope (23) is respectively tangent to the left guide pulley groove and the right guide pulley groove, the steel wire rope (23) is limited between the fixed pulley groove and the left guide pulley groove and between the fixed pulley groove and the right guide pulley groove; the photoelectric emission switch and the photoelectric receiving switch are respectively installed outside the left guide pulley (3) and the right guide pulley (12), the positions of the photoelectric emission switch and the photoelectric receiving switch are matched, the photoelectric receiving switch is connected with the photoelectric relay, the photoelectric relay, the off-track alarm relay (36) and the off-track alarm buzzer (42) are connected in sequence.

2. The overhead traveling crane fixed sheave anti-falling and alarm device according to claim 1, characterized in that: It also comprises a fixed pulley bracket (17), a left guide pulley bracket (20) and a right guide pulley bracket (24), the fixed pulley (1) is fixed with the trolley platform (18) after being connected with the fixed pulley bracket (17) through the fixed pulley rotating shaft (10); the left guide pulley (3) is fixed below the left side of the trolley platform (18) after being connected with the left guide pulley bracket (20) through the left guide pulley rotating shaft (2); the right guide pulley (12) is fixed below the right side of the trolley platform (18) after being connected with the right guide pulley bracket (24) through the right guide pulley rotating shaft (11).

3. The overhead traveling crane fixed sheave anti-falling and alarm device according to claim 1, characterized in that: The angle between the line connecting the centers of the pulley pieces of the left guide pulley (3) and the right guide pulley (12) and the center of the pulley piece of the fixed pulley (1) and the trolley platform (18) is 135 degrees.

4. The device as claimed in claim 1, wherein the device further comprises a safety hook and a safety hook locking mechanism. The number of the pulley pieces of the left guide pulley (3) and the right guide pulley (12) and the pulley piece of the fixed pulley (1) is consistent, one-to-one corresponding and on the same straight line.

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