CN211310635U

CN211310635U - Crane jib height limiting device

Info

Publication number: CN211310635U
Application number: CN201922260893.4U
Authority: CN
Inventors: 孙振; 荆慧钰
Original assignee: Taian Guhe Truck Crane Co ltd
Current assignee: Taian Guhe Truck Crane Co ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2020-08-21
Anticipated expiration: 2029-12-13

Abstract

The utility model discloses a crane jib height limiting device, which comprises a luffing cylinder, wherein a piston rod of the luffing cylinder is fixedly provided with a first side shaft, an oil cylinder barrel of the luffing cylinder is fixedly provided with a second side shaft, the outer end of the first side shaft is fixedly connected with a limiting plate, and the lower part of the limiting plate is in sliding connection with the second side shaft through a limiting hole; a limiting valve is fixedly arranged below the second side shaft, and a valve core of the limiting valve is connected with the limiting plate through a pull rope; the crane jib height limiting device of the utility model adopts mechanical and hydraulic dual limiting, greatly reduces the potential safety hazard and has more reliable performance; and high stop device simple structure, simple to operate can adjust as required spacing height moreover, and the suitability is strong.

Description

Crane jib height limiting device

[ technical field ] A method for producing a semiconductor device

The utility model belongs to the technical field of crane equipment, concretely relates to high stop device of hoist davit.

[ background of the invention ]

According to the requirements of GB/T3811-2008 crane design code: the hoisting mechanisms are provided with hoisting height limiters. When the fetching device rises to the upper limit position specified by design, the starting power source can be automatically cut off "

However, when the existing crane works, the height limit of the crane is controlled only by a height limiter, and the height limiter is generally divided into a weight type limiter, a screw type limiter and a cam type limiter; the weight type limiter has the defects that the lifting appliance can do swinging motion in the lifting working process, the lifting appliance can exceed the working range of a lever of the limiter and continuously rise, and the lifting appliance can exceed the allowable height but does not touch the lever mechanism, so that the protection is invalid; the screw type position limiter has the following defects: a set of screw and nut transmission mechanism is required to be arranged, and trial and error adjustment is required, so that when the lifting height is large, the precision is not high; the disadvantages of cam limiters: a set of variable speed transmission mechanism needs to be arranged, repeated adjustment is needed, and when the lifting height is large, the precision is not high. Therefore, the height limiters have disadvantages, and the height limitation can be achieved when the height limiter is used for limitation, but the effect is poor, and the phenomenon of damage is easy to occur after long-time use.

[ Utility model ] content

To the defect among the prior art, the utility model aims to provide a high stop device of hoist davit simple structure, simple to operate, reliability height, stop device adopts machinery and hydraulic pressure dual spacing, can fully guarantee the restriction of height.

In order to achieve the purpose, the utility model adopts the following technical scheme that the crane jib height limiting device comprises a luffing cylinder, wherein a first side shaft is fixedly arranged on the side surface of a piston rod of the luffing cylinder, a second side shaft is fixedly arranged on the side surface of an oil cylinder barrel of the luffing cylinder, the first side shaft and the second side shaft are positioned in the same vertical direction, a limiting plate is fixedly connected to the outer end of the first side shaft, and the lower part of the limiting plate is in sliding connection with the second side shaft through a limiting hole; and a limiting valve is fixedly arranged below the second side shaft, the limiting valve is connected with the amplitude-variable oil cylinder through an oil pipe, and a valve core of the limiting valve is connected with the limiting plate through a pull rope, so that the valve core of the limiting valve can move along with the limiting plate.

Preferably, the length of the pull rope can be adjusted, so that the limiting height can be adjusted.

Preferably, the limiting plate is connected with the first side shaft through a bolt, so that the limiting plate can be replaced according to the limiting height required.

Preferably, the limit valve is a two-position two-way valve.

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

the height limiting device of the utility model adopts mechanical and hydraulic dual limiting, which not only solves the problem of side shaft deformation caused by the mechanical limiting used alone for a long time, but also avoids the safety accident caused by the unrestricted height of the crane due to the damage of the limiting valve when the hydraulic limiting is used alone; the potential safety hazard is greatly reduced, and the performance is more reliable;

high stop device simple structure, simple to operate can adjust as required spacing height moreover, and the suitability is strong.

[ description of the drawings ]

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of the height limiting device of the present invention;

fig. 2 is a side view of the height limiting device of the present invention;

FIG. 3 is a hydraulic schematic diagram of the height limiting device of the present invention;

wherein, 1-variable amplitude oil cylinder; 2-a limiting plate; 3-pulling a rope; 4-a limit valve; 5-a balancing valve; 101-a first side shaft; 102-a second side shaft; 103-rodless cavity; 104-a rod cavity; 201-a limiting hole; a-a first oil port; b-a second oil port; c-breaking the opening; d-a first one-way valve; e-a spring pull wire; f-a control port; g-a third oil port; h-a fourth oil port; i-a second one-way valve; j-fifth oil port; k-sixth oil port.

[ detailed description ] embodiments

To make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described below with reference to the accompanying drawings and specific embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 and 2, the utility model provides a crane jib height limiting device, including being used for controlling the luffing cylinder 1 that the crane jib fluctuates, fixed being provided with first side axle 101 on the piston rod of luffing cylinder 1, first side axle 101 is fixed to be set up in the side of luffing cylinder piston rod, and the side of luffing cylinder oil cylinder barrel is fixed to be set up second side axle 102, and first side axle 101 and second side axle 102 are located same vertical direction, a limiting plate 2 of outer end fixed connection of first side axle 101, the below of limiting plate 2 is through spacing hole 201 and second side axle 102 sliding connection; a limiting valve 4 is fixedly arranged below the second side shaft 102, the limiting valve 4 is connected with the amplitude variation oil cylinder 1 through an oil pipe, and a valve core of the limiting valve 4 is connected with the limiting plate 2 through a pull rope 3, so that the valve core of the limiting valve 4 can move along with the limiting plate 2.

Preferably, the length of the pull rope 3 can be adjusted, so that the limiting height can be adjusted.

Preferably, the limiting plate 2 is connected with the first side shaft 101 through a bolt, so that the limiting plate 2 can be replaced according to the limiting height.

Preferably, the limit valve 4 is a two-position two-way valve.

High stop device's theory of operation:

the mechanical limiting working principle is as follows: when the piston rod of the amplitude-variable oil cylinder 1 extends out, the suspension arm is pushed to lift, the limiting plate 2 rises along with the first side shaft 3, when the limiting plate 2 rises to the position that the lower edge of the limiting hole 201 is contacted with the lower edge of the second side shaft 102, the piston rod of the amplitude-variable oil cylinder 1 stops rising, the lifting action of the suspension arm stops, and the mechanical limiting function is achieved.

The working principle of hydraulic limiting is shown in fig. 3, the amplitude-variable oil cylinder 1 is provided with a balance valve 5, the limit valve 4 is connected with the amplitude-variable oil cylinder 1 through the balance valve 5, the limit valve 4 is provided with a first oil port a and a second oil port B, hydraulic oil enters the rodless cavity 103 of the amplitude-variable oil cylinder 1 through the first oil port a, the second oil port B, a third oil port G of the balance valve 5, a second one-way valve I and a fourth oil port H, and the hydraulic oil in the rod cavity 104 directly returns to the oil tank, so that a piston rod of the amplitude-variable oil cylinder 1 extends out; the stay cord is connected to a spring stay cord E of the limiting valve 4, when the suspension arm rises, the stay cord moves upwards along with the suspension arm, so that a valve core of the limiting valve 4 is driven to move upwards, when the disconnecting port C moves to the oil ports A and B, an oil inlet of the amplitude-variable oil cylinder 1 is cut off, the suspension arm stops rising, and hydraulic limiting plays a role; when the suspension arm falls, hydraulic oil enters the rod cavity 104 through the control port F in the balance valve 5, the hydraulic oil in the rodless cavity 103 flows back to the limiting valve 4 through the channel H-J-K-G opened by the hydraulic oil at the control port F, the hydraulic oil returns through the first one-way valve D, the amplitude-variable oil cylinder 1 forms a loop, the piston rod can fall, and meanwhile, the limiting valve 4 returns.

Claims

1. A crane jib height limiting device is characterized by comprising a luffing cylinder, wherein a first side shaft is fixedly arranged on the side surface of a piston rod of the luffing cylinder, a second side shaft is fixedly arranged on the side surface of a cylinder barrel of the luffing cylinder, the first side shaft and the second side shaft are positioned in the same vertical direction, the outer end of the first side shaft is fixedly connected with a limiting plate, and the lower part of the limiting plate is in sliding connection with the second side shaft through a limiting hole; and a limiting valve is fixedly arranged below the second side shaft, the limiting valve is connected with the amplitude-variable oil cylinder through an oil pipe, and a valve core of the limiting valve is connected with the limiting plate through a pull rope.

2. The crane boom height limiting apparatus of claim 1, wherein the limiting valve is a two-position, two-way valve.

3. The crane boom height limiting device of claim 1, wherein the length of the pull rope can be adjusted according to the height to be limited.

4. The crane boom height limiting device as claimed in claim 1, wherein the limiting plate is connected with the first side shaft through a bolt, and can be replaced according to the limited height required.