CN111017589A

CN111017589A - Chain bucket ship unloader excavating mechanism

Info

Publication number: CN111017589A
Application number: CN201911101887.2A
Authority: CN
Inventors: 陈翼飞; 刘寿恩; 林博; 武猛
Original assignee: Shenhua Yuedian Zhuhai Port Coal Terminal Co ltd
Current assignee: Shenhua Yuedian Zhuhai Port Coal Terminal Co ltd
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2020-04-17

Abstract

The invention discloses an excavating mechanism of a chain bucket ship unloader, which is characterized in that: the oil storage groove is formed in the middle of the tensioning arm frame rail; the tensioning arm support is connected with the fixed arm support, the tensioning arm support is movably connected with the tensioning arm support rail, the fixed arm support is made of a steel plate bent into an arc section or welded by round steel, and UT nondestructive inspection is adopted during welding; the yield strength of a steel plate adopted by a main structure of the tensioning arm support is not lower than 345Mpa, the thickness of the steel plate is larger than 8mm, and more than 95% of oxide skin and rust on the surface of the metal per unit area are removed by sand blasting during surface treatment of the steel plate. The excavating mechanism of the machine is firm in structure, and can give out sound in time and early warn and is convenient to overhaul.

Description

Chain bucket ship unloader excavating mechanism

Technical Field

The invention relates to a chain bucket ship unloader, in particular to an excavating mechanism of the chain bucket ship unloader.

Background

A bucket ship unloader is a continuous ship unloading device which is rapidly developed in the last decade. At present, the products of the type are developed and produced in Japan, Germany and China. At present, the chain bucket type ship unloader developed in China has two forms. One is the catenary type, which is suitable for deck barge. The chain bucket of the catenary chain bucket ship unloader is not provided with a rigid support at a material taking section and is suspended, and a hopper which is operated when falling on a cabin surface can float up and down along with the cabin surface when a ship jolts, so that the hopper can work tightly to the cabin surface and has the capacity of clearing the cabin. The other type is an L-shaped chain bucket ship unloader, wherein the chain bucket digs out and lifts materials to the top, and the materials are unloaded on an arm frame belt conveyor through a spiral hopper unloader and conveyed to the rear. The L-shaped material taking head can rotate, and the arm support can pitch and rotate. Through automatic control, the material taking head can be guaranteed to move along a certain route.

Compared with the traditional grab ship unloader, the grab ship unloader has the main advantages of high ship unloading efficiency, small environmental pollution (because the material conveying path is basically closed except the material taking machine head, dust is not easy to escape), low energy consumption, small quality, stable work and easy automation realization of operation. The chain bucket ship unloader can be used for unloading materials such as limestone, coal, phosphate, ore sand, raw sugar and the like, the maximum ship unloading production rate is over 2000t/h at present, and the maximum ship type of unloading is a 10-ten-thousand-ton sea ship.

The digging mechanism is an important part of the chain bucket ship unloader and plays a role in supporting the chain to run during the operation process. The existing excavating mechanism mainly comprises a tensioning arm support, a fixed arm support and front and rear chain wheels. During the use, the following problems exist due to the reasons of structural material cracking and bearing damage caused by stress concentration: (1) the structure is easy to damage; (2) no early warning of faults; (3) the maintenance is inconvenient.

Disclosure of Invention

The invention provides an excavating mechanism of a chain bucket ship unloader, which solves the problems that the excavating mechanism in the prior art is easy to damage, inconvenient to maintain and free of fault early warning.

The technical scheme of the invention is realized as follows:

a chain bucket ship unloader excavating mechanism: the oil storage groove is formed in the middle of the tensioning arm frame rail; the tensioning arm support is connected with the fixed arm support, the tensioning arm support is movably connected with the tensioning arm support rail, the fixed arm support is made of a steel plate bent into an arc section or welded by round steel, and UT nondestructive flaw detection is adopted during welding; the yield strength of a steel plate adopted by a main structure of the tensioning arm support is not lower than 345Mpa, the thickness of the steel plate is larger than 8mm, and more than 95% of oxide skin and rust on the surface of the metal per unit area are removed by sand blasting during surface treatment of the steel plate.

And UT non-destructive inspection is adopted during welding, so that on one hand, internal stress of the arm support caused by destructive inspection is avoided, on the other hand, whether machining defects influencing stable mechanics are generated during welding can be ensured, and if the defects during welding are found, the defects can be repaired in time.

The surface treatment helps remove surface defect-causing substances, including but not limited to oxides, which may cause point defects in the surface, which are the sources of corrosion causing further material damage. In addition, point defects can also lead to stress concentrations which, in the case of corrosion, accelerate the destruction of the material and thus the excavation mechanism. The surface treatment removes materials that cause surface defects and helps to prevent damage to the digging mechanism.

Preferably, the tensioning arm support is formed by welding steel plates, and the yield strength of the steel plates is 345 Mpa.

More preferably, the fixed arm support is formed by welding steel plates, and the yield strength of the steel plates is 345 Mpa.

The corner position of the square steel is easy to generate internal stress, the surface area of the corner position is smaller than that of the smooth position, the smaller the area is, the greater the pressure intensity is, and the stress is concentrated. The steel plate is bent into the arc section for transition or round steel is used for replacing square steel in the prior art, so that the stress area can be increased, the stress intensity can be reduced, and the local stress concentration can be reduced to avoid the cracking of the square steel structure.

The triangular section size of the arm support is increased to increase the structural strength and rigidity. The triangle is more stable in mechanical structure, and the larger the size of the triangular section is, the stronger the supporting strength of the triangle can be increased.

More preferably, the tensioning oil cylinder is provided with an oil storage groove, the oil storage groove is provided with more than 2 sealing rings, so that dust can be prevented from entering the bearing cavity, and meanwhile, the dust can be delayed from entering the bearing cavity, and the lubricating condition of the bearing is improved.

The dust accelerates the wear of the bearing and, in addition, if it enters the cavity of the bearing, it affects the quality of the lubricating oil, thus accelerating the wear of the bearing and affecting the smoothness of the rotation of the bearing. The increase of sealing washer keeps out the dust and gets into the bearing cavity, can effectively avoid the lubricated situation of bearing to receive the influence, delays the wearing and tearing of bearing, increases the smoothness nature when bearing rotates. The smoother the bearing rotates, the less the shaking or vibration is generated to the excavating mechanism, and the damage to the structure of the excavating mechanism caused by the excessive degree of the generated shaking or vibration is avoided.

Preferably, the tensioning arm support and the fixed arm support are provided with hand holes convenient to mount and maintain, and the hand holes convenient to mount and maintain are arranged at proper positions, so that the oil cylinder and the pipeline are convenient to maintain.

More preferably, the lower part of the fixed arm support is provided with a group of supporting rollers, the tensioning arm support is connected with the fixed arm support through the supporting rollers, and the tensioning arm support can move on the rollers in the telescopic process, so that the resistance is reduced, and the risk of damage to the arm support structure is reduced.

Preferably, a displacement sensor is arranged on the tensioning oil cylinder.

When the oil cylinder retracts under the impact of the excavating mechanism under the abnormal working condition, the displacement sensor feeds back signals to an operator (a driver) and alarms that the tensioning oil cylinder has the danger of loosening the chain at the moment, and manual intervention is needed, namely manual operation (inching of a button) is carried out to tension the tensioning oil cylinder. Therefore, early warning of faults is achieved.

More preferably, the sand blasting is steel balls or sand grains, the diameter of the steel balls or the sand grains is less than 1mm, so that the treated surface has certain roughness, and the roughness is not more than 100 um.

The invention has the beneficial effects that:

because the steel plate is bent into the arc section for transition or round steel is used for replacing square steel in the prior art, the stress area can be increased, the stress intensity is reduced, and the local stress concentration is reduced, so that the square steel structure is prevented from cracking, and the excavating mechanism structure is prevented from being easily damaged.

In addition, the tensioning arm support is connected with the fixed arm support through the supporting rollers, and the tensioning arm support can move on the rollers in the telescopic process, so that the resistance is reduced, the risk of damage to the arm support is reduced, and the damage to the excavating mechanism structure is avoided.

Moreover, the triangle is more stable in mechanical structure, so that the size of the triangular section of the arm support is increased to increase the structural strength and rigidity, and the possibility of structural damage of the excavating mechanism is reduced.

In addition, the sealing ring is added to prevent dust from entering the bearing cavity, so that the lubricating condition of the bearing can be effectively prevented from being influenced, the abrasion of the bearing is delayed, and the smoothness of the bearing during rotation is improved. The structure of the excavating mechanism is prevented from being damaged by shaking or vibration caused by unsmooth rotation of the bearing.

And moreover, the tensioning oil cylinder is provided with a displacement sensor, so that when the oil cylinder retracts under impact under an abnormal working condition of the excavating mechanism, the displacement sensor feeds back a signal to an operator (driver) and alarms that the tensioning oil cylinder has a chain loosening danger at the moment, and the fault early warning effect is realized.

Meanwhile, the tensioning arm support and the fixed arm support are provided with hand holes convenient to install and maintain, and maintenance of the oil cylinder and the pipeline is facilitated.

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, and 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 present invention;

fig. 2 is a schematic structural view of the tensioning boom track shown in fig. 1;

fig. 3 is a schematic structural view of a bearing seal according to the present invention.

In the figure, 1-tensioning boom track; 2-oil storage groove; 3-a first sealing ring; 4-a second sealing ring; 5-tensioning the arm support; 6, tensioning the oil cylinder; 7-fixing the arm support; 8-tensioning oil cylinder hydraulic pipeline.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

One embodiment of the present invention is:

as shown in fig. 1 to 3, a digging mechanism of a bucket ship unloader: the oil storage device mainly comprises a tensioning arm support rail 1, an oil storage groove 2, a first sealing ring 3, a second sealing ring 4, a tensioning arm support 5, a tensioning oil cylinder 6, a fixed arm support 7 and a tensioning oil cylinder hydraulic pipeline group 8; the tensioning arm support 5 is connected with the fixed arm support 7, the tensioning arm support 5 is movably connected with the tensioning arm support track 1, the fixed arm support 7 is made of a steel plate bent into an arc section or welded by round steel, and UT nondestructive flaw detection is adopted during welding; the yield strength of a steel plate adopted by the main structure of the tensioning arm support 5 is 345Mpa, the thickness of the steel plate is more than 8mm, and more than 95% of oxide skin and rust on the surface of the metal per unit area are removed by sand blasting during surface treatment of the steel plate.

Wherein, the tensioning arm frame is formed by welding steel plates, and the yield strength of the steel plates is not lower than 345 Mpa.

Wherein the fixed arm support is formed by welding steel plates, and the yield strength of the steel plates is not lower than 345 Mpa.

Because the corner position of the square steel is easy to generate internal stress, the surface area of the corner position is smaller than that of the smooth position, the smaller the area is, the greater the pressure intensity is, and the stress is concentrated. The steel plate is bent into the arc section for transition or round steel is used for replacing square steel in the prior art, so that the stress area can be increased, the stress intensity can be reduced, and the local stress concentration can be reduced to avoid the cracking of the square steel structure.

Wherein, tensioning cylinder 6 is equipped with oil storage groove 2, and oil storage groove 2 is equipped with 2 above sealing washers and helps keeping out the dust and get into the bearing cavity, perhaps can postpone the dust and get into the bearing cavity to improve the lubricated situation of bearing.

Another embodiment of the present invention is:

on the basis of the above embodiment, the tensioning arm support 5 and the fixed arm support 7 are provided with hand holes convenient for installation and maintenance, and the hand holes convenient for installation and maintenance are arranged at proper positions, so that the maintenance of the oil cylinder and the pipeline is facilitated.

In addition, a group of supporting rollers is arranged at the lower part of the fixed arm support 7, the tensioning arm support 5 is connected with the fixed arm support 7 through the supporting rollers, and the tensioning arm support 5 can move on the rollers in the telescopic process, so that the resistance is reduced, and the risk of damage to the arm support structure is reduced.

In addition, a displacement sensor is disposed on the tension cylinder 5.

Furthermore, the sand blasting is steel balls or sand grains, the diameter of the sand grains is smaller than 1mm, so that the treated surface has certain roughness, and the roughness is not larger than 100 um.

The coating requirements of the invention are as follows:

the color of the structural member adopts red R03, and the sprocket adopts RAL 1003. The paint brand adopts products of medium and far western provinces or the same quality.

a) Standard of surface treatment

The contract equipment steel surface treatment standard adopts the Swedish anticorrosion Standard Association SIS055900-1967 standard.

The surface treatment quality of major components, working in humid conditions for long periods, must reach level sa2.5, i.e.: removing more than 95% of oxide skin, rust and other dirt on the surface of the metal per unit area by sand blasting to make the surface close to metallic silvery white.

The rust removal quality of the surface of the auxiliary component reaches Sa2 grade, namely, rolling scale, rust and impurities on the surface of all metal are removed, and the surface is close to light gray.

b) Quality of surface treatment

The surface treatment must be strictly performed according to the above standards, and after the specified standards are met, grease, water, coal cinder, coating, flash, burr, dust and the like which affect the quality of a paint film on the surface must be completely removed.

In order to ensure the quality of the surface treatment, the steel balls or sand grains used for the surface treatment have the diameter not larger than 1mm so as to ensure that the treated surface has certain roughness and the roughness is not more than 100 um.

Coatings that are damaged during transport or construction must be repainted.

Before repairing, the oil dirt on the surface must be wiped off by using a solvent, salt particles and dust are washed off by using clear water, and then paint is repaired.

The paint used for the priming paint, the intermediate paint and the finishing paint for coating the steel structure and the parts is the same type of product.

It must be applied at a prescribed temperature and humidity. The coating cannot be performed beyond the allowable temperature and humidity.

In the drying process of the paint film, if dust flies, the paint film cannot be coated if the surrounding air needs to be kept clean.

The parts to be welded were coated after 72 hours. When the surface temperature of the steel is higher than 40 ℃, the coating cannot be carried out.

And brushing the welding seams, edges and edges of the front welding parts once by using a steel brush in a formal coating manner.

And after the surface treatment is qualified, coating a first paint within 4-6 hours, and performing secondary treatment on the surface after the time is exceeded.

All paints are airless sprayed by a spray gun and strictly adhere to the operating regulations of the spray gun.

In rainy, frosty and windy weather, the coating cannot be applied outdoors.

When dew condensation occurs on the treated surface, the coating cannot be performed.

In layered coating, the color of each layer is maintained with sufficient contrast to identify whether the surface is completely covered.

Paint films on various parts damaged in transportation and installation must be carefully repainted. Before the paint is repaired, the damaged part must be subjected to surface treatment, and then corresponding paint is repaired layer by layer.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a chain bucket ship unloaders excavating mechanism which characterized in that: the oil storage groove is formed in the middle of the tensioning arm frame rail; the tensioning arm support is connected with the fixed arm support, the tensioning arm support is movably connected with the tensioning arm support rail, the fixed arm support is made of a steel plate bent into an arc section or welded by round steel, and UT nondestructive flaw detection is adopted during welding; the yield strength of a steel plate adopted by a main structure of the tensioning arm support is not lower than 345Mpa, the thickness of the steel plate is larger than 8mm, and more than 95% of oxide skin and rust on the surface of the metal per unit area are removed by sand blasting during surface treatment of the steel plate.

2. The chain bucket ship unloader excavation mechanism of claim 1, wherein: the tensioning arm frame is formed by welding steel plates, and the yield strength of the steel plates is 345 MPa.

3. The chain bucket ship unloader excavation mechanism of claim 2, wherein: the fixed arm support is formed by welding steel plates, and the yield strength of the steel plates is 345 MPa.

4. The chain bucket unloader excavation mechanism of claim 3, wherein: the tensioning hydro-cylinder is equipped with the oil storage slot, the oil storage slot is equipped with more than 2 sealing washers.

5. The chain bucket unloader excavation mechanism of claim 4, wherein: the tensioning arm support and the fixed arm support are provided with hand holes convenient to install and maintain.

6. The chain bucket unloader excavation mechanism of claim 5, wherein: and a group of supporting rollers is arranged at the lower part of the fixed arm support.

7. The chain bucket unloader excavation mechanism of claim 6, wherein: and a displacement sensor is arranged on the tensioning oil cylinder.

8. The chain bucket unloader excavation mechanism of claim 7, wherein: the sand blasting is steel balls or sand grains, and the diameter of the sand blasting is less than 1 mm.