CN215558628U

CN215558628U - Secondary limit structure of electric chain hoist

Info

Publication number: CN215558628U
Application number: CN202122050389.9U
Authority: CN
Inventors: 朱云国
Original assignee: Zhejiang Kaidao Hoisting Machinery Co ltd
Current assignee: Zhejiang Kaidao Hoisting Machinery Co ltd
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2022-01-18
Anticipated expiration: 2031-08-27

Abstract

The utility model belongs to the technical field of electric hoists, and relates to a secondary limiting structure of a chain electric hoist, which comprises an electric hoist and a chain driven by the electric hoist to move up and down, wherein the bottom of the chain is provided with a lifting hook, a buffer block sleeved on the chain is arranged above the lifting hook, a secondary limiting switch is arranged between the electric hoist and the lifting hook, the secondary limiting switch is provided with a contact positioned right above the buffer block, and the buffer block touches the contact of the secondary limiting switch when the lifting hook moves up. The secondary limiting structure of the electric chain hoist provided by the utility model can be used for carrying out secondary limiting on the lifting height of the lifting hook, so that the safety performance of the electric chain hoist is improved.

Description

Secondary limit structure of electric chain hoist

Technical Field

The utility model belongs to the technical field of electric hoists, and relates to a secondary limiting structure of a chain electric hoist.

Background

The electric hoist is a special hoisting device, is arranged on a crown block and a gantry crane, has the characteristics of small volume, light dead weight, simple operation, convenient use and the like, and is used in places such as industrial and mining enterprises, storage docks and the like. The electric block is generally installed on a single-beam crane, a bridge crane, a gantry crane and a suspension crane.

The electric chain hoist is one of electric block, and traditional electric chain hoist rises to a certain position through the lifting hook buffer block and presses down the spacing leading truck of installing in chain exit position, and the leading truck rotates and drives limit switch and realizes spacing once. Because traditional endless chain electric block only once spacing, should spacing in case malfunctioning, the calabash will not have stop device, has certain potential safety hazard, and the jack-up thing of its below bumps into the motor owing to rise excessively easily, causes electric block's damage.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides a secondary limiting structure of a ring chain electric hoist, which can carry out secondary limiting on the lifting height of a lifting hook, thereby improving the safety performance of the electric hoist.

In order to solve the above technical problems, the object of the present invention is achieved by the following technical solutions:

secondary limit structure of endless chain electric block, including electric block and the chain that reciprocates by the electric block drive, the bottom of chain is provided with the lifting hook, the top of lifting hook is provided with the cover and establishes the buffer block on the chain, be provided with secondary limit switch between electric block and the lifting hook, be provided with the contact that is located directly over the buffer block on the secondary limit switch, the buffer block touches secondary limit switch's contact when the lifting hook moves up.

In foretell secondary limit structure of chain electric block, the contact is the annular contact, the contact cover is established on the chain and is left the clearance with the chain between, the clearance supplies the chain freely to remove from top to bottom.

In the secondary limit structure of the chain electric hoist, one side of the contact is provided with an opening through which the chain can pass, preferably, the width of the opening is slightly larger than the thickness of the chain, and preferably, the opening is arranged on the opposite side of the secondary limit switch.

In the secondary limiting structure of the chain electric hoist, the secondary limiting switch is arranged on the limiting switch bracket, and the limiting switch bracket is fixed on a motor bottom plate of the electric hoist.

In foretell secondary limit structure of chain electric block, the limit switch support is L shape support, and the upper end of limit switch support is vertical fixes in one side of motor bottom plate, and the lower extreme level sets up, secondary limit switch fixes in the lower extreme bottom of limit switch support, the shape of limit switch support can be according to motor bottom plate and do the adaptability adjustment.

In the secondary limiting structure of the chain electric hoist, the limiting switch bracket and the motor bottom plate and the secondary limiting switch and the limiting switch bracket are fastened and connected through the fastening bolt, and the fastening bolt can be replaced by other fixing modes.

In foretell chain electric block's secondary limit structure, the buffer block includes lid and buffer spring, buffer spring installs between lid and lifting hook, buffer spring, lid and the coaxial setting of contact.

Compared with the prior art, the utility model has the following beneficial effects:

according to the utility model, the secondary limit switch is matched with the original buffer block to secondarily limit the lifting height of the lifting hook, and the primary limit device at the original chain outlet position is combined to realize double limit, so that even if one limit device fails, a limit protection effect is also realized, and thus the safety of the electric hoist is greatly improved.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a perspective view of the secondary limit switch of the present invention;

reference numerals: 1. an electric hoist; 2. a chain; 3. a hook; 4. a buffer block; 4a, a cover body; 4b, a buffer spring; 5. a secondary limit switch; 6. a contact; 7. an opening; 8. a limit switch bracket; 9. motor bottom plate.

Detailed Description

The utility model is further described in the following with specific embodiments in conjunction with the accompanying drawings, see fig. 1-2:

secondary limit structure of endless chain electric block, including electric block 1 and the chain 2 that reciprocates by the drive of electric block 1, the bottom of chain 2 is provided with lifting hook 3, the top of lifting hook 3 is provided with the cover and establishes buffer block 4 on chain 2, be provided with secondary limit switch 5 between electric block 1 and the lifting hook 3, be provided with on the secondary limit switch 5 and be located buffer block 4 directly over contact 6, buffer block 4 touches secondary limit switch 5's contact 6 when lifting hook 3 moves up.

The limiting principle of the utility model is as follows: when the electric hoist 1 hoists an object, the chain 2 moves upwards, the lifting hook 3 moves upwards along with the chain, when the buffer block 4 above the lifting hook 3 moves to a set position, the buffer block 4 touches the contact 6 of the secondary limit switch 5, and the secondary limit switch 5 closes the motor after receiving a limit signal to block the lifting hook 3 from further rising. When the secondary limit switch 5 fails, the lifting hook 3 further rises to trigger the original primary limit switch, and the primary limit switch still plays a limiting protection role. Thereby realizing double limiting and greatly improving the safety.

In order to enable the buffer block 4 to more stably touch the contact 6, the contact 6 is an annular contact, the contact 6 is sleeved on the chain 2 and a gap is reserved between the contact and the chain 2, the gap is used for the chain 2 to freely move up and down, and interference on normal operation of the electric hoist is prevented.

Further, for more convenient installation of the secondary limit switch 5, an opening 7 through which the chain 2 can pass is provided at one side of the contact 6, preferably, the width of the opening 7 is slightly larger than the thickness of the chain 2, and preferably, the opening 7 is provided at the opposite side of the secondary limit switch 5.

Above-mentioned buffer block 4 includes lid 4a and buffer spring 4b, buffer spring 4b installs between lid 4a and lifting hook 3, and buffer spring 4b provides cushioning effect, preferred for buffer block 4 collides the time, buffer spring 4b, lid 4a and the coaxial setting of contact 6, lid 4a is roughly the same with contact 6's external diameter.

The utility model further provides an installation structure of the secondary limit switch 5, which comprises the following steps:

the secondary limit switch 5 is installed on a limit switch bracket 8, and the limit switch bracket 8 is fixed on a motor bottom plate 9 of the electric hoist 1.

Further, limit switch support 8 is L shape support, and limit switch support 8's upper end is vertical to be fixed in one side of motor bottom plate 9, and the lower extreme level sets up, secondary limit switch 5 is fixed in limit switch support 8's lower extreme bottom, limit switch support 8's shape can be according to motor bottom plate 9 and do the adaptability adjustment.

Furthermore, the limit switch bracket 8 and the motor bottom plate 9, and the secondary limit switch 5 and the limit switch bracket 8 are fastened and connected by fastening bolts, and the fastening bolts can also be replaced by other fixing modes.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered by the protection scope of the utility model.

Claims

1. Secondary limit structure of endless chain electric block, chain (2) that reciprocate including electric block (1) and by electric block (1) drive, the bottom of chain (2) is provided with lifting hook (3), the top of lifting hook (3) is provided with buffer block (4) that the cover was established on chain (2), its characterized in that, be provided with secondary limit switch (5) between electric block (1) and lifting hook (3), be provided with on secondary limit switch (5) and be located buffer block (4) directly over contact (6), buffer block (4) touched contact (6) of secondary limit switch (5) when lifting hook (3) shifted up.

2. The secondary limit structure of the electric chain hoist according to claim 1, wherein the contact (6) is an annular contact, and the contact (6) is sleeved on the chain (2) and has a gap with the chain (2).

3. The secondary limit structure of the electric chain hoist as claimed in claim 2, characterized in that one side of the contact (6) is provided with an opening (7) through which the chain (2) can pass.

4. The secondary limit structure of the electric chain hoist as claimed in claim 1, wherein the secondary limit switch (5) is mounted on a limit switch bracket (8), and the limit switch bracket (8) is fixed on a motor base plate (9) of the electric hoist (1).

5. The secondary limit structure of the electric chain hoist according to claim 4, characterized in that the limit switch bracket (8) is an L-shaped bracket, the upper end of the limit switch bracket (8) is vertically fixed on one side of the motor bottom plate (9), the lower end is horizontally arranged, and the secondary limit switch (5) is fixed at the bottom of the lower end of the limit switch bracket (8).

6. The secondary limit structure of the electric chain hoist according to claim 5, characterized in that the limit switch bracket (8) and the motor bottom plate (9) and the secondary limit switch (5) and the limit switch bracket (8) are fastened and connected by fastening bolts.

7. The secondary limit structure of the electric chain hoist according to claim 2, wherein the buffer block (4) comprises a cover body (4a) and a buffer spring (4b), the buffer spring (4b) is installed between the cover body (4a) and the lifting hook (3), and the buffer spring (4b), the cover body (4a) and the contact (6) are coaxially arranged.