CN215946531U

CN215946531U - Heavy hammer limiting device for lifting device

Info

Publication number: CN215946531U
Application number: CN202121950218.5U
Authority: CN
Inventors: 王尚; 孙南; 高瑞琦; 郭辉
Original assignee: Shaanxi Special Equipment Inspection And Testing Institute
Current assignee: Shaanxi Special Equipment Inspection And Testing Institute
Priority date: 2021-08-19
Filing date: 2021-08-19
Publication date: 2022-03-04
Anticipated expiration: 2031-08-19

Abstract

The utility model relates to the technical field of limiting devices and mechanisms, and discloses a heavy hammer limiting device for a lifting device, which comprises a guide device arranged beside a limiting switch; the weight dropper is sleeved in the guide device and can move up and down; the heavy hammer comprises a hammer rod, the top end of the heavy hammer is provided with a hammer head, the middle of the heavy hammer is provided with a limiting rod, and the bottom of the heavy hammer is fixed with a limiting plate; the guiding device comprises a guiding cylinder with a hollow inner part and a fixing plate fixed at the top of the guiding cylinder; the guide cylinder and the fixed plate are sleeved on the hammer rod and are positioned between the limiting rod and the limiting plate. The lifting device, the heavy hammer and the contact of the limit switch are arranged in the same vertical line, when the lifting device of the lifting device pushes up or is far away from the limit plate, the hammer rod moves upwards or downwards, the hammer head touches or is far away from the contact of the limit switch, and then the power supply of the lifting device is controlled to be switched off and on, so that the lifting device is limited.

Description

Heavy hammer limiting device for lifting device

Technical Field

The utility model relates to the technical field of limiting devices and mechanisms, in particular to a heavy hammer limiting device for a lifting device.

Background

The lifting device is a proper mechanism for all cranes, and is provided with a lifting limit position limiter, namely a switch for limiting the lifting position, so that when the lifting hook device or the lifting appliance is lifted to the limit position, the power supply of the motor and the main power supply are automatically cut off, and the lifting hook device or other lifting appliances are prevented from being lifted.

In order to ensure safety, a crane lifting device is generally provided with two limit switches, one is a spiral type, and the other is a weight type, and the two limit switches are arranged at different positions to respectively control different circuit breaking devices, so that a top impact accident caused by the failure of one limit switch is avoided, and a double-insurance effect is achieved.

The existing weight type limit switch adopts a spring type weight limiting device and a weight fixed on a steel wire rope through the connection of the steel wire rope, the spring device is easy to lose efficacy for a long time, and the weight is easy to rotate around a lifting steel wire rope, so that the connection steel wire rope is easy to wind the lifting steel wire rope, the limit of the weight is lost, and even a pulley device of the lifting device is damaged.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a heavy hammer limiting device for a lifting device, which aims to solve the problem that a connecting steel wire rope is easy to wind a lifting steel wire rope to cause the limiting failure of the heavy hammer due to the fact that the heavy hammer is easy to rotate around the lifting steel wire rope.

The utility model is realized by the following technical scheme:

a heavy hammer limiting device for a lifting device comprises a guide device arranged beside a limiting switch; the heavy hammer is sleeved in the guide device and can move up and down;

the heavy hammer comprises a hammer rod, the top end of the heavy hammer is provided with a hammer head, the middle of the heavy hammer is provided with a limiting rod, and the bottom of the heavy hammer is fixed with a limiting plate; the guide device comprises a guide cylinder with a hollow inner part and a fixing plate fixed at the top of the guide cylinder; the guide cylinder and the fixing plate are sleeved on the hammer rod and are positioned between the limiting rod and the limiting plate;

a lifting appliance of the lifting device pushes the hammer rod to move upwards, and the guide cylinder limits the high position of the hammer through a limiting plate; the lifting appliance of the lifting device moves downwards, the hammer rod moves downwards naturally, and the fixed plate limits the low position of the hammer through the limiting rod.

Further, the weight is located right below the limit switch contact.

Furthermore, the limit switch and the guide cylinder are both arranged on the same platform and are positioned on the same horizontal plane.

Furthermore, the hammer head, the limiting rod, the hammer rod and the limiting plate are all in rigid connection.

Further, the hammer head is tapered.

Furthermore, the middle of the fixing plate is provided with an opening communicated with the guide cylinder, and the inner diameters of the opening and the guide cylinder are adapted to the outer diameter of the hammer rod.

The utility model has the following beneficial effects:

the lifting appliance, the heavy hammer and the contact of the limit switch are arranged in the same vertical line, when the lifting appliance upwards touches the limit plate, the hammer rod upwards moves, and the hammer head touches the contact of the limit switch, so that the power supply of the lifting device is controlled to be disconnected; when the lifting appliance leaves the limiting plate downwards, the hammer head moves downwards through self weight, and the hammer head is loosened and is far away from a contact of the limiting switch, so that the power supply of the lifting device is controlled to be switched on; the lifting device is limited through the process; in addition, the utility model has simple structure, convenient manufacture, installation and maintenance, low failure rate, high reliability and long service life by adopting mechanical and physical limiting; meanwhile, the influence on the normal work of the hoisting steel wire rope is avoided.

Drawings

FIG. 1 is a schematic view of a weight limiting device for a lifting device;

FIG. 2 is a schematic diagram of the structure of the weight;

in the figure: 1-limit switch, 2-weight hammer, 201-weight hammer, 202-limit rod, 203-weight rod, 204-limit plate, 3-guiding device, 301-guiding cylinder and 302-fixing plate.

Detailed Description

The present invention will be described in detail with reference to specific embodiments.

A weight limiting device for a lifting device is disclosed, referring to fig. 1, and comprises a guide device 3 arranged beside a limiting switch 1, a weight 2 is sleeved in the guide device 3 and can move up and down, and the weight 2 is positioned right below a contact of the limiting switch 1;

referring to fig. 2, the heavy hammer 2 includes a hammer rod 203, a conical hammer head 201 is arranged at the top end of the hammer rod, a limiting rod 202 is arranged in the middle of the hammer rod, at least one limiting rod 202 is arranged, and a limiting plate 204 is fixed at the bottom of the limiting rod 202; the hammer head 201, the limiting rod 202, the hammer rod 203 and the limiting plate 204 are all in rigid connection;

the guide device 3 comprises a guide cylinder 301 with a hollow inner part and a fixing plate 302 fixed on the top of the guide cylinder; the guide cylinder 301 and the fixing plate 302 are sleeved on the hammer rod 203 and are positioned between the limiting rod 202 and the limiting plate 204, the middle of the fixing plate 302 is provided with an opening communicated with the guide cylinder 301, and the inner diameters of the opening and the guide cylinder 301 are adaptive to the outer diameter of the hammer rod 203; the limit switch 1 and the guide cylinder 301 are both arranged on the same platform and are positioned on the same horizontal plane, so that the relative height between the hammer head 2 and the limit switch 1 can be conveniently controlled, and the contact between the hammer head 2 and a contact of the limit switch 1 can be further ensured;

a lifting appliance of the lifting device pushes the hammer rod 203 to move upwards, and the guide cylinder 301 limits the high position of the hammer 2 through the limiting plate 204; the lifting appliance of the lifting device moves downwards, the hammer rod 203 naturally moves downwards, and the fixing plate 302 limits the low position of the hammer 2 through the limiting rod 202.

The action principle of the utility model is as follows:

when a lifting appliance of the lifting device moves upwards to touch the limiting plate 204, the hammer rod 203 is pushed to move upwards, so that the hammer head 201 touches a contact of the limiting switch 1, and the power supply of the lifting device is controlled to be disconnected; when a lifting appliance of the lifting device moves downwards to leave the limiting plate 204, the hammer 201 moves downwards under the action of gravity, the hammer 201 is far away from and loosens a contact of the limiting switch 1, and a power supply of the lifting device is controlled to be turned on.

The utility model has simple structure, convenient manufacture, installation and maintenance, low failure rate, high reliability and long service life, and adopts mechanical and physical limit; meanwhile, the influence on the normal work of the hoisting steel wire rope is avoided.

The utility model is not limited to the examples, and any equivalent changes to the technical solution of the utility model by a person skilled in the art after reading the description of the utility model are covered by the claims of the utility model.

Claims

1. A heavy hammer limiting device for a lifting device is characterized by comprising a guide device (3) arranged beside a limiting switch (1); the heavy hammer (2) is sleeved in the guide device (3) and can move up and down;

the heavy hammer (2) comprises a hammer rod (203), the top end of the heavy hammer is provided with a hammer head (201), the middle of the heavy hammer is provided with a limiting rod (202), and the bottom of the heavy hammer is fixed with a limiting plate (204); the guide device (3) comprises a guide cylinder (301) with a hollow inner part and a fixing plate (302) fixed at the top of the guide cylinder; the guide cylinder (301) and the fixing plate (302) are sleeved on the hammer rod (203) and are positioned between the limiting rod (202) and the limiting plate (204);

a lifting appliance of the lifting device pushes a hammer rod (203) to move upwards, and a guide cylinder (301) limits the high position of a hammer (2) through a limiting plate (204); a lifting appliance of the lifting device moves downwards, the hammer rod (203) naturally moves downwards, and the fixing plate (302) limits the low position of the hammer (2) through the limiting rod (202).

2. A weight limiting device for a hoist according to claim 1, wherein the weight (2) is located directly below the contact of the limit switch (1).

3. A weight limiter for a hoist according to claim 2, wherein the limit switch (1) and the guide cylinder (301) are both disposed on the same platform and on the same horizontal plane.

4. A weight limiter for a hoisting device as claimed in claim 3, wherein the hammer head (201), the limiting rod (202), the hammer rod (203) and the limiting plate (204) are rigidly connected.

5. A weight limiter for a hoist according to claim 4, wherein the hammer head (201) is tapered.

6. A weight limiter for a hoist according to claim 5, wherein the fixing plate (302) has an opening in the middle thereof communicating with the guide cylinder (301), and the opening and the guide cylinder (301) have inner diameters adapted to the outer diameter of the hammer rod (203).