Non-contact gravity limiting device

Abstract

The utility model discloses a kind of contactless gravity limiting devices, including relay, electromagnetic sensor, sensor bracket, heavy hammer, pin shaft, heavy hammer bracket, steel wire rope, counterweight, the sensor bracket is set on the table of trolley frame;The sensor bracket is respectively set relay and electromagnetic sensor;The heavy hammer bracket is set on the table of trolley frame;Heavy hammer is set on the heavy hammer bracket;Heavy hammer is connected with heavy hammer bracket by pin shaft;The position of the front end of heavy hammer is adapted to the inductive end position of electromagnetic sensor;The counterweight is set below trolley frame;One end of the counterweight is connected with the rear end hole of heavy hammer by steel wire rope, and the other end is consolidated with trolley frame by steel wire rope;The counterweight is above hanger.The utility model is simple in structure, easy to maintain, reliable in work, and can effectively limit protection to crane hanger.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical equipment technology, and further to the field of limit device technology. Specifically, it relates to a contactless gravity limit device that is simple in structure, easy to maintain, and reliable in operation. Background Technology

[0002] In industries such as metallurgy, infrastructure, chemicals, and food, process requirements necessitate the detection of the position of equipment, workpieces, and items, especially the extreme positions of equipment. As special equipment, lifting equipment requires the detection of the hook's extreme positions, the trolley's travel position, and the hoist's travel position to ensure safety. Currently used limit switches are generally mechanical limit switches. Mechanical limit switches transmit signals by mechanically actuating electrical contacts through gears or linkages. Mechanical limit switches have the following shortcomings in use:

[0003] 1. Signal transmission has always relied on contact transmission, which is prone to damage, failure, and malfunction during long-term use; after the electrical system has been running for a period of time, the contacts may not close properly, resulting in false signals and causing the position signal of the detected object to become disordered.

[0004] 2. Short service life, generally 1 to 3 years.

[0005] 3. It is significantly affected by the environment. For example, dust, oil, and humidity will affect the mechanical transmission, the opening and closing of contacts, and electrical insulation; temperature and vibration will significantly affect the lifespan and reliability of the equipment.

[0006] 4. When the position of the object being detected swings significantly (greater than 50 mm) back and forth or left and right, the position of the object being detected cannot be accurately determined.

[0007] 5. The detection signal of the limit device can only be brought close to the object being detected and cannot be separated.

[0008] Therefore, the key to solving this problem is to research and develop a contactless gravity limiting device that is simple in structure, easy to maintain, and reliable in operation. Utility Model Content

[0009] The purpose of this utility model is to provide a contactless gravity limiting device that is simple in structure, easy to maintain, and reliable in operation.

[0010] The purpose of this utility model is achieved as follows: it includes a relay, an electromagnetic sensor, a sensor bracket, a counterweight, a pin, a counterweight support, a steel wire rope, and a counterweight block. The sensor bracket is mounted on the platform of the trolley frame; the relay and the electromagnetic sensor are respectively mounted on the sensor bracket; the counterweight support is mounted on the platform of the trolley frame; the counterweight is mounted on the counterweight support; the counterweight is connected to the counterweight support via a pin; the front end of the counterweight is positioned to match the sensing end of the electromagnetic sensor; the counterweight block is positioned below the trolley frame; one end of the counterweight block is connected to the rear end hole of the counterweight via a steel wire rope, and the other end is fixed to the trolley frame via a steel wire rope; the counterweight block is located above the hook.

[0011] This utility model consists of a relay, an electromagnetic sensor, a sensor bracket, a counterweight, a pin, a counterweight support, a steel wire rope, and a counterweight block. The sensor bracket is installed on the platform of the trolley frame, and the relay and electromagnetic sensor are installed on the sensor bracket. The counterweight support is installed on the platform of the trolley frame, and the counterweight is installed on the counterweight support via a pin. The counterweight block is located below the trolley frame and above the hook. One end of the counterweight block is connected to the rear end hole of the counterweight via a steel wire rope, and the other end is connected to the trolley frame via a steel wire rope.

[0012] When the crane is operating normally, the counterweight, pulled by the counterweight block, is positioned above the electromagnetic sensor, and the relay is not activated. When the hook rises to the upper limit of the lifting height, the hook pushes the counterweight block upward, causing the wire rope to slack. Consequently, the counterweight descends under gravity and approaches the electromagnetic sensor. At this point, the relay activates, issuing a stop command, de-energizing the hook's traveling mechanism, and achieving upper limit stop protection.

[0013] This invention will not malfunction, increasing reliability by 5 times; its service life has been extended from 1-3 years to 5-8 years or more; the average number of failures per year has been reduced from 10 to less than 1; maintenance and inspection are more intuitive and quick, and the time to handle faults has been reduced from about 1 hour to less than 10 minutes, increasing efficiency by about 83%; installation is not limited by environment or location, making it highly practical.

[0014] This utility model has a simple structure, is easy to maintain, works reliably, and can effectively limit and protect the crane hook. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] In the diagram: 1-Relay, 2-Electromagnetic sensor, 3-Sensor bracket, 4-Flag, 5-Pin, 6-Flag bracket, 7-Wire rope, 8-Counterweight, 9-Trolley frame, 10-Hook. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings, but this does not limit the present invention in any way. Any modifications made based on the teachings of the present invention shall fall within the protection scope of the present invention.

[0018] like Figure 1 As shown, this utility model includes a relay 1, an electromagnetic sensor 2, a sensor bracket 3, a counterweight 4, a pin 5, a counterweight support 6, a steel wire rope 7, and a counterweight block 8. The sensor bracket 3 is mounted on the platform of the trolley frame 9. The relay 1 and the electromagnetic sensor 2 are respectively mounted on the sensor bracket 3. The counterweight support 6 is mounted on the platform of the trolley frame 9. The counterweight 4 is mounted on the counterweight support 6. The counterweight 4 is connected to the counterweight support 6 via the pin 5. The front end of the counterweight 4 is positioned to match the sensing end of the electromagnetic sensor 2. The counterweight block 8 is positioned below the trolley frame 9. One end of the counterweight block 8 is connected to the rear end hole of the counterweight 4 via the steel wire rope 7, and the other end is fixed to the trolley frame 9 via the steel wire rope 7. The counterweight block 8 is located above the hook 10.

[0019] The hammer 4 can rotate flexibly on the pin 5.

[0020] The weight of the counterweight 8 is adapted to the weight of the hammer 4, and the counterweight 8 can drag the hammer 4 to rotate around the pin 5.

[0021] The working principle and process of this utility model:

[0022] This utility model consists of a relay 1, an electromagnetic sensor 2, a sensor bracket 3, a counterweight 4, a pin 5, a counterweight support 6, a steel wire rope 7, and a counterweight block 8. The sensor bracket 3 is mounted on the platform of the trolley frame 9, and the relay 1 and the electromagnetic sensor 2 are mounted on the sensor bracket 3. The counterweight support 6 is mounted on the platform of the trolley frame 9, and the counterweight 4 is mounted on the counterweight support 6 via the pin 5. The counterweight block 8 is located below the trolley frame 9 and above the hook 10. One end of the counterweight block 8 is connected to the rear end hole of the counterweight 4 via the steel wire rope 7, and the other end is connected to the trolley frame 9 via the steel wire rope 7.

[0023] When the crane is operating normally, the counterweight 4 is positioned above the electromagnetic sensor 2 under the traction of the counterweight 8, and the relay 1 is not activated. When the hook 10 rises to the upper limit of the lifting height, the hook 10 pushes the counterweight 8 upward, causing the wire rope 7 to slack. Consequently, the counterweight 4 descends under gravity and approaches the electromagnetic sensor 2. At this point, the relay 1 activates, issuing a stop command, and the running part of the hook 10 is de-energized, achieving the upper limit stop protection.

Claims

1. A contactless gravity limiting device, comprising a relay (1), an electromagnetic sensor (2), a sensor bracket (3), a counterweight (4), a pin (5), a counterweight bracket (6), a wire rope (7), and a counterweight block (8), characterized in that: The sensor bracket (3) is set on the platform of the trolley frame (9); a relay (1) and an electromagnetic sensor (2) are respectively set on the sensor bracket (3); the counterweight bracket (6) is set on the platform of the trolley frame (9); a counterweight (4) is set on the counterweight bracket (6); the counterweight (4) is connected to the counterweight bracket (6) through a pin (5); the front end of the counterweight (4) is adapted to the sensing end position of the electromagnetic sensor (2); the counterweight block (8) is set below the trolley frame (9); one end of the counterweight block (8) is connected to the rear end hole of the counterweight (4) through a wire rope (7), and the other end is fixed to the trolley frame (9) through a wire rope (7); the counterweight block (8) is located above the hook (10).

2. The contactless gravity limiting device according to claim 1, characterized in that: The hammer (4) can rotate on the pin (5).

3. The contactless gravity limiting device according to claim 1, characterized in that: The weight of the counterweight (8) is adapted to the weight of the hammer (4), and the counterweight (8) can drag the hammer (4) to rotate around the pin (5).

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