CN213265425U

CN213265425U - Lifting limiter for lifting hook

Info

Publication number: CN213265425U
Application number: CN202020867822.0U
Authority: CN
Inventors: 张青林; 刁华东; 刘明发; 朱进; 冼星桥
Original assignee: China National Offshore Oil Corp Shenzhen Branch
Current assignee: China National Offshore Oil Corp Shenzhen Branch
Priority date: 2020-05-21
Filing date: 2020-05-21
Publication date: 2021-05-25
Anticipated expiration: 2030-05-21

Abstract

The utility model discloses a lifting hook lifting limiter, which comprises a closed shell, a contactor switch arranged in the shell and a pull ring component connected below the contactor switch; a hanging plate for connecting an iron chain is arranged on the top plate of the shell; the bottom plate of the shell is provided with a through hole, and the lower end of the pull ring assembly penetrates through the through hole and is located below the shell. The utility model discloses a lifting hook plays to rise stopper, and the airtight setting of casing seals contactor switch wherein, avoids being drenched and take place the scheduling problem that opens circuit by liquid such as rainwater, guarantees the safety of hoist and mount work.

Description

Lifting limiter for lifting hook

Technical Field

The utility model relates to a stopper especially relates to a lifting hook plays to rise stopper.

Background

The crane is used as a common device of a hoisting device of an offshore oil platform, and when a large hook head and a small hook head of the crane are lifted to a certain height, the hook heads can cause the positioning failure of a steel wire rope due to the collision of the hook heads on a steel wire rope pulley block of the crane, so that a dangerous situation occurs. In order to eliminate hidden troubles, a gravity iron ring is hung 1.5 meters below the pulley, and iron chains are respectively arranged on the left and the right of the gravity iron ring and connected to the top end of the hanging rod. One of the iron chains is provided with an electronic alarm which is also called a limiter. The lower end of the limiter is provided with a pull ring, a pull ring connecting rod is connected to a tension spring inside the contactor switch, the tension spring extends when the pull ring is pulled downwards, the switch is closed, and the switch is switched on when the pull ring returns upwards to the top end when the tension spring retracts.

The gravity hoop is motionless, and a meter department above the lifting hook has a jump bit of fixing on hoisting cable, drives the jump bit when the lifting hook rises and rises, reaches gravity hoop department and produces the promotion to the gravity hoop, and gravity hoop lift force lets the iron chain lose the pulling force to the inside tension spring of contactor switch of stopper contracts, and switch turn-on signal passes to the driver's cabin, lets the operation of driving the loop wheel personnel to stop rising. Therefore, a crane driver can perform corresponding operation by obtaining the alarm signal, and the hook head is prevented from rising to the top to damage the suspension rod.

The existing limiter is an open type, a contactor switch of the existing limiter is positioned at the upper end of a shell of the limiter and is exposed outside, rainwater can enter the contactor switch to be disconnected, and the problems of insensitivity, failure and the like of the limiter are caused. In addition, the pull ring is made of cast aluminum materials, when the offshore wind speed is high, the lifting hook swings to drive the iron chain to swing along with the lifting hook, the impact hammer can have vertical impact force, and the pull ring can be broken and damaged by the impact force. In addition, the pull ring is easily affected with damp and rusty when the offshore platform is in a humid and salt environment for a long time, and the risk of breakage is increased.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in that, to foretell prior art defect, a modified lifting hook plays to rise stopper is provided.

The utility model provides a technical scheme that its technical problem adopted is: the lifting hook lifting limiter comprises a closed shell, a contactor switch arranged in the shell and a pull ring assembly connected below the contactor switch;

a hanging plate for connecting an iron chain is arranged on the top plate of the shell; the bottom plate of the shell is provided with a through hole, and the lower end of the pull ring assembly penetrates through the through hole and is located below the shell.

Preferably, the pull ring assembly comprises a stuffing box, a tension spring, a connecting rod made of stainless steel and a pull ring;

the upper end of the stuffing box penetrates into the contactor switch and is fixed below the contactor switch; the connecting rod axially penetrates through the stuffing box and can move up and down back and forth relative to the stuffing box, and the top of the connecting rod penetrates through the upper end of the stuffing box and is opposite to a switch device in the contactor switch; the pull ring is connected with the lower end of the connecting rod outside the shell; the lower end of the connecting rod is provided with a convex limiting ring for limiting the downward moving stroke of the connecting rod;

the tension spring is arranged in the upper end of the stuffing box and sleeved on the connecting rod to drive the connecting rod to move upwards to reset so as to trigger the switch device.

Preferably, the pull ring comprises a ring part and a connecting part connected to the ring part; the ring part is positioned outside the shell, and the connecting part can be movably matched in the through hole and connected with the lower end of the connecting rod.

Preferably, the pull ring assembly further comprises a first clamping ring made of stainless steel, wherein the first clamping ring is clamped at the periphery of the lower end of the connecting rod and abuts against the limiting ring and the connecting part.

Preferably, the connecting part is provided with a screw hole, and the lower end of the connecting rod is matched in the screw hole through threads.

Preferably, the pull ring assembly further comprises a first fixing ring and a second fixing ring which are opposite to each other at an upper interval and a lower interval and are respectively sleeved on the connecting rod, and a second clamping ring which is abutted to the upper part of the first fixing ring and is clamped on the connecting rod and is made of stainless steel; the first fixing ring is fixed on the connecting rod, and the second fixing ring is fixed in the upper end of the stuffing box;

the tension spring is connected between the first fixing ring and the second fixing ring; the pull ring and the connecting rod compress the tension spring when moving downwards under stress, and the tension spring drives the connecting rod to move upwards to trigger a switch device of the contactor switch when stretching.

Preferably, the connecting rod is provided with a concave clamping groove corresponding to the second clamping ring; the diameter of the rod section where the clamping groove is located on the connecting rod is larger than 2 mm.

Preferably, the rod segment has a diameter of 5 mm.

Preferably, the contactor switch includes a contactor housing, a switching device disposed at an inner upper end of the contactor housing; the bottom of the contactor shell is provided with a hole part for matching the upper end of the stuffing box;

the switch device comprises a connecting bridge support connected with the top in the contactor shell through a pressure spring, at least one contact arranged on the connecting bridge support, and at least one contactor arranged corresponding to the contact; when the connecting rod moves upwards to touch the connecting bridge bracket, the connecting bridge bracket is driven to move upwards relative to the contactor shell and simultaneously compress the pressure spring, so that the contact is driven to be in contact conduction with the contactor; when the connecting rod moves downwards to leave the bridge support, the pressure spring extends to drive the bridge support to move downwards, and then the contact is driven to leave the contactor.

Preferably, the hanger plate is located at a central position of the top plate.

The utility model discloses a lifting hook plays to rise stopper, and the airtight setting of casing seals contactor switch wherein, avoids being drenched and take place the scheduling problem that opens circuit by liquid such as rainwater, guarantees the safety of hoist and mount work.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic structural view of a hook lifting limiter (after a shell panel is removed) according to an embodiment of the present invention;

fig. 2 is a top view of the hook lifting stop of fig. 1;

FIG. 3 is an exploded view of the tab assembly shown in FIG. 1;

fig. 4 is a schematic structural view of a pull ring assembly in a lifting hook lifting limiter according to an embodiment of the present invention after being pulled down;

fig. 5 is a schematic structural view of a pull ring assembly in a lifting hook lifting limiter according to an embodiment of the present invention after moving up and resetting;

fig. 6 is a schematic structural view of a lifting hook lifting limiter according to an embodiment of the present invention on a crane.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, the lifting hook lifting limiter 1 of an embodiment of the present invention is used for a crane, and may include a closed housing 10, a contactor switch 20 disposed in the housing 10, and a pull ring assembly 30 connected below the contactor switch 20.

The housing 10 may include opposing top and

bottom plates

11, 12, and a plurality of side plates 13 connected between the top and

bottom plates

11, 12. The side plates 13 are connected in a surrounding manner, and a space for accommodating the contactor switch 20 is defined between the top plate 11 and the bottom plate 12. One of the side plates 13 serves as a panel and can be detached, so that the contactor switch 20 and the like can be maintained and replaced conveniently. The top plate 11 of the housing 10 is provided with a hanger plate 40 for connecting an iron chain. The bottom plate 12 of the case 10 is provided with a through hole 120, and the lower end of the tab assembly 30 is positioned below the case 10 through the through hole 120 for connecting a gravity iron ring.

The hanger plate 40 is connected with the iron chain through a hanging hole. In this embodiment, as shown in fig. 2, the hanging plate 40 is located at the center of the top plate 11, which is beneficial to prevent the stopper from deviating or shifting when the iron chain is hung on the whole stopper.

Within the housing 10, a contactor switch 20 is located within the upper end of the interior of the housing 10. A positioning plate 14 is also provided in the housing 10 to be supported below the contactor switch 20.

As shown in fig. 3-5, the tab assembly 30 includes a stuffing box 31, a tension spring 32, a connecting rod 33 made of stainless steel, and a tab 34. Wherein, adopt stainless steel material to replace the cast aluminium material of traditional use to make connecting rod 33 and pull ring 34, improve structural strength, the difficult condition such as fracture that takes place of marine use.

The stuffing box 31 is inserted with its upper end into the contactor switch 20 and fixed below the contactor switch 20, for which purpose the positioning plate 14 may be provided with a through hole for the passage of the stuffing box 31. A sealing ring (not shown) is further installed in a gap between the upper end of the stuffing box 31 and the contactor switch 20 to perform a sealing function.

The connecting rod 33 axially penetrates through the stuffing box 31 and can move up and down back and forth relative to the stuffing box 31 and the shell 10. Wherein the axial length of the connecting rod 33 is greater than the length of the stuffing box 31. The connecting rod 33 mainly penetrates into the stuffing box 31 at the upper end thereof, the top of the connecting rod 33 penetrates out of the upper end of the stuffing box 31 and is opposite to the switching device 22 in the contactor switch 20, and the top of the connecting rod 33 is driven to be in contact with the switching device 22 or be far away from the switching device 22 along with the up-and-down movement of the connecting rod 33. The lower end of the link 33 is located below the stuffing box 31 and thus also below the contactor switch 20.

The pull ring 34 is connected to the lower end of the link 33 outside the housing 10. A protruding stopper 331 is provided on the lower end of the link 33 to limit the downward movement stroke of the link 33. The outer circumference of the retainer ring 331 has a size (e.g., diameter, etc.) greater than the inner diameter of the through-hole 120. As shown in fig. 1 and 4, when the pull ring 34 and the connecting rod 33 are forced to move downward, the limiting ring 331 moves downward until it abuts against the inner surface of the bottom plate 12 of the housing 10, and at this time, the connecting rod 33 stops moving downward. As shown in fig. 1 and 5, when the pull ring 34 and the connecting rod 33 move upward, the upward movement can be stopped after the stop ring 331 abuts against the stuffing box 31.

Specifically, as shown in fig. 1 and 2, the pull ring 34 may include a ring portion 341 and a connecting portion 342 connected to the ring portion 341. The ring portion 341 is located outside the housing 10, and the connecting portion 342 is movably fitted in the through hole 120 and connected to the lower end of the link 33. The connecting part 342 and the connecting rod 33 can be connected through threads; for example, the connecting portion 342 is provided with a screw hole 343, and the lower end of the link 33 (a portion below the stopper ring 331) is screw-fitted in the screw hole 343.

The tab assembly 30 further includes a first snap ring 35 made of stainless steel, which is caught at the outer periphery of the lower end of the connecting rod 33 and abuts between the stopper ring 331 and the connecting portion 342, to restrict the connecting rod 33 from rotating relative to the stuffing box 31.

The tension spring 32 is disposed in the upper end of the stuffing box 31 and sleeved on the connecting rod 33, and drives the connecting rod 33 to move upwards to reset to trigger the switch device 22. When the pull ring 34 and the link 33 are forced to move downward, the tension spring 32 is stretched. When the external force is removed, the tension spring 32 retracts and recovers due to the self-restoring force, and simultaneously drives the connecting rod 33 and the pull ring 34 to move upwards.

Referring to fig. 3-5, in order to restrain the tension spring 32 on the connecting rod 33, the pull ring assembly 30 further includes a first fixing ring 36 and a second fixing ring 37 which are opposite to each other at an upper-lower interval and respectively sleeved on the connecting rod 33, and a second stainless steel snap ring 38 abutting on the upper side of the first fixing ring 36 and clamped on the connecting rod 33. The first fixing ring 36 is fixed to the connecting rod 33, and the engagement of the second snap ring 38 on the connecting rod 33 restrains the first fixing ring 36 on the connecting rod 33. The second fixing ring 37 is fixed in the upper end of the stuffing box 31, and is further fastened to the inner wall surface of the upper end of the stuffing box 31 by a seal ring 39.

The connecting rod 33 is provided with a concave clamping groove 332 corresponding to the second clamping ring 38, and the second clamping ring 38 is clamped in the clamping groove 332. The rod section 333 of the connecting rod 33, in which the locking groove 332 is located, is enlarged compared to the prior art so that its diameter is greater than 2mm, preferably 5 mm. The second snap ring 38 is disposed corresponding to the rod segment 333.

The tension spring 32 is connected between a first fixing ring 36 and a second fixing ring 37. When the pull ring 34 and the connecting rod 33 are forced to move downwards, the first fixing ring 36 is driven to move downwards to compress the tension spring 32. The tension spring 32 is extended to move the link 33 upward by driving the first fixing ring 36 upward, thereby activating the switching device 22 of the contactor switch 20.

As further shown in fig. 4 and 5, the contactor switch 20 may include a contactor housing 21, and a switching device 22 disposed at an inner upper end of the contactor housing 21. The bottom of the contactor housing 21 is provided with a hole portion for the upper end of the stuffing box 31 to fit.

The switching device 22 includes a bridge support 221 connected to the top of the contactor housing 21 via a compression spring 23, at least one contact 222 disposed on the bridge support 221, and at least one contactor 223 disposed corresponding to the contact 222. The bridge bracket 221 can move up and down in the contactor housing 21, and the moving direction is consistent with the moving direction of the connecting rod 33; the contact housing 21 may be provided with a slide groove 24 for guiding the movement of the bridge support 221. The contactor 223 is fixed within the contactor housing 21 and positioned above the contacts 222.

When the connecting rod 33 moves upwards to enable the top of the connecting rod to touch the connecting bridge bracket 221, the connecting bridge bracket 221 is driven to move upwards relative to the contactor shell 21 and compress the compression spring 23, the contact 222 is driven to be in contact with the contactor 223 to be conducted (as shown in fig. 5), and the contactor switch 20 sends a signal to control the system after being conducted. When the connecting rod 33 moves downwards and leaves the bridge bracket 221, the pressure spring 23 is stretched to drive the bridge bracket 221 downwards, and further drive the contact 222 to leave the contactor 223 (as shown in fig. 4), and the contactor switch 20 is disconnected and does not send signals.

With reference to fig. 1 and 4-6, the utility model discloses a lifting hook plays to rise stopper 1 when using, installs on an iron chain 3 on gravity hoop 2, and is located the lower extreme of this iron chain 3, and lifting hook plays to rise stopper 1 and connects gravity hoop 2 with its pull ring 34, can alleviate the error that is brought by 3 gravity of iron chain like this. When the lifting hook 4 rises, the impact hammer 5 is driven to rise, the gravity iron ring 2 is lifted when the impact hammer reaches the gravity iron ring 2, and the pull ring 34 loses tension when the gravity iron ring 2 rises, so that the tension spring 32 in the lifting limiter 1 of the lifting hook shrinks, the contactor switch 20 is triggered to be switched on and send a signal to a cab, a driver stops the lifting operation of the crane according to the signal control, and the lifting hook 4 is prevented from rising to the top to damage a lifting rod.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A lifting hook lifting limiter is characterized by comprising a closed shell, a contactor switch arranged in the shell and a pull ring assembly connected below the contactor switch;

2. A lifting hook lifting stop as claimed in claim 1, wherein the pull ring assembly comprises a stuffing box, a tension spring, a connecting rod made of stainless steel and a pull ring;

3. A lifting hook lifting stop as claimed in claim 2, wherein the pull ring comprises a ring portion and a connecting portion connected to the ring portion; the ring part is positioned outside the shell, and the connecting part can be movably matched in the through hole and connected with the lower end of the connecting rod.

4. A lifting hook lifting limiter as claimed in claim 3, wherein the pull ring assembly further comprises a first stainless steel snap ring captured around the lower end of the connecting rod and abutting between the limiting ring and the connecting portion.

5. A lifting hook lifting limiter as claimed in claim 3, wherein the connecting portion is provided with a screw hole in which the lower end of the connecting rod is screw-fitted.

6. A lifting hook lifting limiter as claimed in claim 2, wherein the pull ring assembly further comprises a first fixing ring and a second fixing ring which are opposite to each other at an upper and lower interval and respectively sleeved on the connecting rod, and a second clamping ring which abuts against the upper side of the first fixing ring and is clamped on the connecting rod and is made of stainless steel; the first fixing ring is fixed on the connecting rod, and the second fixing ring is fixed in the upper end of the stuffing box;

7. A lifting hook lifting limiter as claimed in claim 6, wherein the connecting rod is provided with a concave slot corresponding to the second snap ring; the diameter of the rod section where the clamping groove is located on the connecting rod is larger than 2 mm.

8. A lifting hook lifting stop as claimed in claim 7, wherein the rod section is 5mm in diameter.

9. A lifting hook lifting stop as claimed in claim 2, wherein the contactor switch comprises a contactor housing, a switching device disposed at an upper end within the contactor housing; the bottom of the contactor shell is provided with a hole part for matching the upper end of the stuffing box;

10. A lifting hook lifting stop as claimed in any one of claims 1 to 9, wherein the hanger plate is located centrally on the top plate.