Rubber protection device for lifting cold-rolled steel coils

Abstract

The rubber protection device for hoisting cold-rolled steel coils of the present invention comprises: a steel plate protection layer, a pull rod, a steel cylinder protection sleeve, a magnet positioning frame, a spring, a steel cylinder, a vertical steel plate, a suction claw protection layer, a magnet suction claw and an arc-shaped load-bearing plate. The lower end of the vertical steel plate is welded to one end of the arc-shaped load-bearing plate. A steel plate protection layer is wrapped outside the vertical steel plate and the arc-shaped load-bearing plate. The steel plate protection layer on the outside of the arc-shaped load-bearing plate contacts the inner wall of the hole of the steel coil to be lifted, and the steel plate protection layer on the inner side of the vertical steel plate contacts the side wall of the steel coil to be lifted. At least two steel cylinders are welded to the upper end of the vertical steel plate. A spring is installed in the steel cylinder. The lower end of the spring abuts against the vertical steel plate, and the upper end of the spring abuts against the pull rod. The pull rod extends out of the steel cylinder. The upper end of the pull rod bends towards the outer circumferential surface of the steel coil to be lifted. A magnet positioning frame is welded to the upper end of the pull rod. A magnet suction claw is installed in the magnet positioning frame. The outer sides of the steel plate protection layer, the steel cylinder protection sleeve and the suction claw protection layer are on a straight line.

Description

Technical Field

[0001] The invention relates to a clamp sheath, in particular to a rubber protective device used for hoisting cold-rolled steel coils. Background Art

[0002] The quality of cold-rolled products greatly affects the quality level of the entire steel plant's products. The process flow of cold-rolled products is complex, the equipment investment is large, the technical content is high, and the product quality itself has high requirements for performance and appearance. The difference in appearance quality directly affects the quality grade of the product. Every year, cold-rolled plates in steel mills are generally downgraded by customers due to appearance quality, which invisibly causes huge quality waste and value loss. The market value of cold-rolled products that are downgraded due to product appearance quality is tens of millions of yuan nationwide each year. Therefore, improving the surface quality of cold-rolled steel coils is an active practice of the country's advocacy of improving quality and efficiency. This work has great practical significance for improving the appearance quality and yield rate of cold-rolled steel coil products nationwide.

[0003] Cold rolled steel strip is generally thinner, usually between 0.3mm and 2mm. In many links of the production process and in transportation, steel strip is usually hoisted by overhead crane in the form of steel coil (coil weight is usually between 8-28 tons). In the critical transportation link involving the surface quality of the steel plate, if the steel coil is not protected, when the overhead crane clamp is clamping and hoisting the steel coil, due to the unevenness and misalignment of the end surface of the steel coil, when the heavy steel clamp is clamping and hoisting, the unevenness and misalignment of the end surface of the steel coil may occur. Uneven and misaligned positions, thin steel plates will be pinched and scratched, and the long-term wear between the clamp and the steel coil will shorten the service life of the clamp contact arm and reduce the safety factor, increasing the safety risk during operation; in addition, during the lifting operation, the steel crane clamp foot contacts the inner diameter of the steel coil, and the clamp foot bears the main weight of the steel coil. Therefore, when the clamp foot contacts the inner diameter of the steel coil, there is a slight relative movement, which will cause damage and scratches to the steel plate surface of the inner diameter of the steel coil. As the steel coil users have increasingly stringent requirements on product quality, the problem of coil damage during the lifting of steel coils seriously affects the yield rate of steel coils and brings a large number of products with quality issues, which in turn leads to a significant reduction in the economic benefits of advanced, high-investment, highly automated cold rolling production lines. At the same time, in the complex and changing steel market, there is a lack of effective market competitiveness.

[0004] There are mainly two existing protection methods. One is to improve the protection of the crane tongs. Mainly, polymer or rubber guard plates are fixed on the side of the crane tongs arm that holds the steel coil and the surface of the tong feet to protect the steel coil. The necessary condition for this kind of protection improvement is that there is an achievable installation space for improvement of the crane tongs while ensuring the safety factor remains unchanged. This situation has relatively high requirements for the structure of the crane tongs, and the application range is limited to a certain extent. The other is to protect the steel coil. Mainly, a rubber protective cover similar to a straw hat structure is sleeved into the inner diameter at both ends of the steel coil to prevent the tongs from directly contacting the steel coil and causing damage to the end face of the steel coil. The main problems existing in the use of this rubber protective cover are as follows: In modern cold-rolled steel coil production, the inner diameter of most steel coils is φ610mm, and the outer diameter of the steel coil is generally between 1500 - 2200mm. A rubber protective cover similar to a straw hat structure that meets the use size requirements generally weighs about 25 kilograms (if a shaped steel skeleton is added, the weight will increase to at least 30 kilograms). First, it is heavy, and it is very cumbersome, inconvenient, and inflexible to use. Operators need to load and unload it, and the labor intensity is very high. Second, the outer diameter of the rubber protective cover is about 1200mm and the thickness is about 15mm. It is very inconvenient for one person to install, and generally two people are required to install it in a centered manner, resulting in an increase in the personnel time cost. In addition, the most crucial point is that if good protection and long life are to be achieved for the steel coil, generally, a shaped steel skeleton needs to be added and the thickness of the rubber layer in contact with the steel coil needs to be increased, which will cause a large increase in weight and cost. Neither the use convenience nor the cost is acceptable in reality. Summary of the Invention

[0005] The invention object of this application is to solve the problem in the prior art that the tongs arm and tong feet for hoisting cold-rolled steel coils cannot be effectively protected, and to provide a rubber protection device for hoisting cold-rolled steel coils. This rubber protection device realizes the effective protection of the steel coil, the tongs arm and the tong feet. It has the characteristics of convenient installation, being applicable to steel coils with different outer diameters, different crane working conditions, and long service life.

[0006] In order to achieve the invention object of this application, the following technical solutions are adopted in this application:

[0007] A rubber protection device for hoisting cold-rolled steel coils according to the present invention, the rubber protection devices are respectively installed on two symmetrical sides of the steel coil to be hoisted, and two clamping arm for hoisting the cold-rolled steel coil respectively extend into the holes of the steel coil to be hoisted, and the two clamping arms are respectively in direct contact with the rubber protection device, wherein: The rubber protection device includes: a steel plate protection layer, a pull rod, a steel cylinder protection sleeve, a magnet positioning frame, a spring, a steel cylinder, a vertical steel plate, a suction claw protection layer, a magnet suction claw and an arc-shaped load-bearing plate. The lower end of the vertical steel plate is welded to one end of the arc-shaped load-bearing plate, and the steel plate protection layer is coated on the outside of the vertical steel plate and the arc-shaped load-bearing plate. The steel plate protection layer on the outside of the arc-shaped load-bearing plate contacts the inner wall of the hole of the steel coil to be hoisted, and the steel plate protection layer on the inner side of the vertical steel plate contacts the side wall of the steel coil to be hoisted. The vertical steel plate is a sector-shaped steel plate that fits the side wall of the steel coil to be hoisted. At least two steel cylinders are welded to the upper end of the vertical steel plate. A steel cylinder protection sleeve is coated on the outside of the steel cylinder. A spring is installed in the steel cylinder. The lower end of the spring is welded to the vertical steel plate, and the upper end of the spring is welded to the pull rod. The pull rod extends out of the steel cylinder, and the upper end of the pull rod bends towards the outer circumferential surface of the steel coil to be hoisted. A magnet positioning frame is welded to the upper end of the pull rod, and a magnet suction claw is installed in the magnet positioning frame. The upper end of the pull rod and the magnet positioning frame are parallel to the axis of the steel coil to be hoisted. A suction claw protection layer is coated on the outside of the upper end of the pull rod and the magnet positioning frame. The outer sides of the steel plate protection layer, the steel cylinder protection sleeve and the suction claw protection layer are on a straight line, so that the outer sides of the steel plate protection layer, the steel cylinder protection sleeve and the suction claw protection layer respectively contact the two clamping arms.

[0008] A rubber protection device for hoisting cold-rolled steel coils according to the present invention, wherein: the vertical steel plate is a sector-shaped steel plate of 50°-120°.

[0009] A rubber protection device for hoisting cold-rolled steel coils according to the present invention, wherein: a plurality of weight-reducing holes are opened on the vertical steel plate, and the weight-reducing holes are evenly distributed along the circumferential direction of the sector surface of the vertical steel plate.

[0010] A rubber protection device for hoisting cold-rolled steel coils according to the present invention, wherein: three steel cylinders are installed at the upper end of the vertical steel plate.

[0011] A rubber protection device for hoisting cold-rolled steel coils according to the present invention, wherein: the thickness of the inner side of the steel plate protection layer on the vertical steel plate is greater than the thickness of the steel cylinder protection sleeve on the same side, so that the inner side of the steel plate protection layer contacts the side wall of the steel coil to be hoisted, and the steel cylinder protection sleeve does not contact the side wall of the steel coil to be hoisted.

[0012] A rubber protection device for hoisting cold-rolled steel coils according to the present invention, wherein: the suction claw protection layer and the steel cylinder protection sleeve are made of polyurethane or natural rubber.

[0013] A rubber protection device for hoisting cold-rolled steel coils according to the present invention, wherein: the rubber Shore hardness range of the inner side of the steel plate protection layer is SHORE 45-65, which plays a role in protecting the edge of the steel plate at the end face of the steel coil.

[0014] A rubber protection device for hoisting cold-rolled steel coils of the present invention has the following advantages:

[0015] ① According to the size range of the inner diameter and outer diameter of the steel coil, the suction claw part mainly composed of a magnet, a pull rod, and a spring and the protection body part composed of a pull rod steel cylinder, a fan-shaped metal skeleton, and rubber are designed. The magnet plays a role in adsorbing and positioning the steel plate, the pull rod and the spring play a role in adjusting the installation size, the fan-shaped perforated metal skeleton plays a role in enhancing shaping support, reducing weight, and having a long service life, and the rubber layer mainly plays a role in protecting and buffering the steel plate.

[0016] ② The structural design of the fan-shaped perforated metal skeleton realizes the functions of light weight, convenient installation, and reduced labor intensity of the protection device; the structural design of the magnetic telescopic suction claw realizes the functions of convenient assembly and positioning, adjustable installation size, and light weight; the structural design with the entire outer surface of the device being rubber realizes the isolation protection between the device and the steel coil and the avoidance of frictional damage between the clamp arm and the steel coil, greatly improving the safety factor of the crane arm and protecting the safety of personnel at the production site.

[0017] ③ The fan-shaped metal skeleton and the pull rod steel cylinder are welded at the connection, both ends of the spring are welded to the lower end of the pull rod and the lower end of the pull rod steel cylinder respectively, and the upper end of the pull rod is welded to the positioning steel frame with a magnet. These three parts form the skeleton of the overall device, and a one-time integral polyurethane rubber casting and encapsulation molding process is carried out.

[0018] ④ The rubber layer on the inner side of the protection plate of the device should protrude a little. This part contacts the steel coil and should play a role in wear resistance and buffering. Rubber with high impact resistance, low friction coefficient, wear resistance, and moderate Shore hardness is used. The characteristics of the rubber used help to play a role in preventing damage to the edge of the steel coil, absorbing impact force, and having wear resistance.

[0019] ⑤ The assembly method of the device and the skeleton is simple. The magnetic telescopic suction claw is positioned and adsorbed on the outer diameter of the steel coil. By applying force downward through the weight reduction hole, the arc-shaped load-bearing plate of the device can be inserted into the inner diameter of the steel coil. After releasing the hand, under the elastic force of the spring, the device is tightly fixed on the steel coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a front view of the rubber protection device for hoisting cold-rolled steel coils of the present invention installed on a cold-rolled steel coil hoisting crane;

[0021] Figure 2 is Figure 1 an enlarged view in the direction of A in, and for the sake of clarity, only the rubber protection device of the present invention and the steel coil to be lifted are drawn in the figure;

[0022] Figure 3 isFigure 1 Schematic diagram of the B-direction magnification in the figure. For clarity, only the rubber protection device of the present invention is shown in the figure;

[0023] Figure 4 From Figure 3 Enlarged schematic diagram of the lateral sectional view taken along the C-C section;

[0024] Figure 5 From Figure 4 Enlarged schematic diagram of the downward sectional view taken along the D-D section.

[0025] In Figures 1 to 5 In the figure, label 1 is the hook; label 2 is the support; label 3 is the clamp opening and closing mechanism; label 4 is the clamp arm; label 5 is the steel plate protection layer; label 6 is the weight reduction hole; label 7 is the pull rod; label 8 is the steel cylinder protection sleeve; label 9 is the magnet positioning frame; label 10 is the spring; label 11 is the steel cylinder; label 12 is the vertical steel plate; label 13 is the suction claw protection layer; label 14 is the magnet suction claw; label 15 is the steel coil to be lifted; label 16 is the hole of the steel coil to be lifted; label 17 is the arc-shaped load-bearing plate. Specific implementation mode

[0026] As Figure 1 And 2 As shown in the figure, the lifting of cold-rolled steel coils includes: a hook 1, a support 2, a clamp opening and closing mechanism 3 and a clamp arm 4. The rubber protection devices of the present invention for lifting cold-rolled steel coils are respectively installed on the two symmetrical sides of the steel coil 15 to be lifted. The two clamp arms 4 for lifting the cold-rolled steel coils respectively extend into the holes 16 of the steel coil to be lifted, and the two clamp arms 4 are in direct contact with the rubber protection devices respectively.

[0027] As Figures 3 to 5As shown in the figure, the rubber protection device includes: a steel plate protection layer 5, a pull rod 7, a steel cylinder protection sleeve 8, a magnet positioning frame 9, a spring 10, a steel cylinder 11, a vertical steel plate 12, a suction claw protection layer 13, a magnet suction claw 14, and an arc-shaped load-bearing plate 17. The lower end of the vertical steel plate 12 is welded to one end of the arc-shaped load-bearing plate 17. A steel plate protection layer 5 is wrapped outside the vertical steel plate 12 and the arc-shaped load-bearing plate 17. The steel plate protection layer 5 on the outside of the arc-shaped load-bearing plate 17 contacts the inner wall of the steel coil hole 16 to be lifted, and the steel plate protection layer 5 on the inner side of the vertical steel plate 12 contacts the side wall of the steel coil 15 to be lifted. The vertical steel plate 12 is a 60° sector steel plate that fits the side wall of the steel coil 15 to be lifted. Four weight-reducing holes 6 are opened on the vertical steel plate 12, and the weight-reducing holes 6 are evenly distributed along the circumferential direction of the sector surface of the vertical steel plate 12. Three steel cylinders 11 are installed at the upper end of the vertical steel plate 12. A steel cylinder protection sleeve 8 is wrapped outside the steel cylinder 11. A spring 10 is installed inside the steel cylinder 11. The lower end of the spring 10 abuts against the vertical steel plate 12, and the upper end of the spring 10 abuts against the pull rod 7. The pull rod 7 extends out of the steel cylinder 11. The upper end of the pull rod 7 bends towards the outer circumferential surface of the steel coil 15 to be lifted. A magnet positioning frame 9 is welded to the upper end of the pull rod 7. A magnet suction claw 14 is installed inside the magnet positioning frame 9. The upper end of the pull rod 7 and the magnet positioning frame 9 are parallel to the axis of the steel coil 15 to be lifted. A suction claw protection layer 13 is wrapped outside the upper end of the pull rod 7 and the magnet positioning frame 9. The outer sides of the steel plate protection layer 5, the steel cylinder protection sleeve 8, and the suction claw protection layer 13 are on a straight line, so that the outer sides of the steel plate protection layer 5, the steel cylinder protection sleeve 8, and the suction claw protection layer 13 respectively contact two clamp arms 4. The thickness of the inner side of the steel plate protection layer 5 on the vertical steel plate 12 is greater than the thickness of the steel cylinder protection sleeve 8 on the same side, so that the inner side of the steel plate protection layer 5 contacts the side wall of the steel coil 15 to be lifted, and the steel cylinder protection sleeve 8 does not contact the side wall of the steel coil 15 to be lifted. The suction claw protection layer 13 and the steel cylinder protection sleeve 8 are made of polyurethane or natural rubber. The rubber Shore hardness range of the inner side of the steel plate protection layer 5 is SHORE 45 - 65, which plays a role in protecting the edge of the steel plate at the end face of the steel coil.

[0028] A method for installing a rubber protection device for lifting cold-rolled steel coils according to the present invention is described as follows:

[0029] First, position and adsorb the magnetic extension iron suction claw 14 on the outer diameter of the steel coil 15 to be lifted. Then, pull downward forcefully through the weight-reducing holes until the arc-shaped load-bearing plate 17 of the device can be inserted into the inner diameter of the steel coil, so that the arc-shaped load-bearing plate 17 coated with the steel plate protection layer 5 fits the inner diameter of the steel coil 15 to be lifted. After releasing the hand, under the elastic force of the spring 10, the rubber protection device of the present invention is tightly fixed at both ends of the steel coil.

[0030] A working principle of a rubber protection device for lifting cold-rolled steel coils according to the present invention is described as follows:

[0031] First, the clamp arm 4 descends, and the jaws are centered and aligned with the center of the hole 16 of the steel coil to be lifted with rubber protection devices installed at both ends. The clamp arm 4 is moderately tightened and rises to contact the arc-shaped load-bearing plate 17 of the present invention. The two clamp arms 4 are respectively fitted and clamped against the outer sides of the steel plate protection layer 5, the steel cylinder protection sleeve 8, and the suction cup protection layer 13. At this time, the concave and convex parts and the overflow parts of the end face of the steel coil 15 to be lifted are embedded in the elastic rubber on the outer side of the steel plate protection layer 5. After the clamp arm 4 lifts the steel coil 15 to be lifted, it will not cause damage to the steel coil 15 to be lifted, thus maximizing the protection of the end face steel plate of the steel coil 15 to be lifted. After being hoisted in place, the two clamp arms 4 are opened and separated from the steel coil 15 to be lifted, and the operator can then remove the rubber protection device of the present invention.

[0032] The embodiments described above are only used to describe the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A rubber protection device for lifting cold-rolled steel coils, the rubber protection devices are respectively installed on the symmetric two sides of the steel coil to be lifted (15), the two clamp arms (4) for lifting the cold-rolled steel coil respectively extend into the holes (16) of the steel coil to be lifted, and the two clamp arms (4) are respectively in direct contact with the rubber protection device. It is characterized in that: The rubber protection device includes: a steel plate protection layer (5), a pull rod (7), a steel cylinder protection sleeve (8), a magnet positioning frame (9), a spring (10), a steel cylinder (11), a vertical steel plate (12), a suction claw protection layer (13), a magnet suction claw (14) and an arc-shaped load-bearing plate (17). The lower end of the vertical steel plate (12) is welded to one end of the arc-shaped load-bearing plate (17). The outside of the vertical steel plate (12) and the arc-shaped load-bearing plate (17) is covered with a steel plate protection layer (5). The steel plate protection layer (5) on the outside of the arc-shaped load-bearing plate (17) contacts the inner wall of the hole (16) of the steel coil to be lifted, and the steel plate protection layer (5) on the inner side of the vertical steel plate (12) contacts the side wall of the steel coil to be lifted (15). The vertical steel plate (12) is a sector-shaped steel plate that fits the side wall of the steel coil to be lifted (15). At least two steel cylinders (11) are welded to the upper end of the vertical steel plate (12). A steel cylinder protection sleeve (8) is covered on the outside of the steel cylinder (11). A spring (10) is installed in the steel cylinder (11). The lower end of the spring (10) abuts against the vertical steel plate (12), and the upper end of the spring (10) abuts against the pull rod (7). The pull rod (7) extends out of the steel cylinder (11). The upper end of the pull rod (7) bends towards the outer circumferential surface of the steel coil to be lifted (15). A magnet positioning frame (9) is welded to the upper end of the pull rod (7). A magnet suction claw (14) is installed in the magnet positioning frame (9). The upper end of the pull rod (7) and the magnet positioning frame (9) are parallel to the axis of the steel coil to be lifted (15). The outside of the upper end of the pull rod (7) and the magnet positioning frame (9) is covered with a suction claw protection layer (13). The outer sides of the steel plate protection layer (5), the steel cylinder protection sleeve (8) and the suction claw protection layer (13) are on a straight line, so that the outer sides of the steel plate protection layer (5), the steel cylinder protection sleeve (8) and the suction claw protection layer (13) respectively contact the two clamp arms (4).

2. The rubber protection device for lifting cold-rolled steel coils according to claim 1, It is characterized in that: The vertical steel plate (12) is a sector-shaped steel plate of 50° to 120°.

3. The rubber protection device for lifting cold-rolled steel coils according to claim 2, It is characterized in that: A number of weight-reducing holes (6) are opened on the vertical steel plate (12), and the weight-reducing holes (6) are evenly distributed along the circumferential direction of the sector surface of the vertical steel plate (12).

4. The rubber protection device for lifting cold-rolled steel coils according to claim 3, It is characterized in that: Three steel cylinders (11) are installed at the upper end of the vertical steel plate (12).

5. The rubber protection device for lifting cold-rolled steel coils according to claim 4, It is characterized in that: The thickness of the inner side of the steel plate protective layer (5) on the vertical steel plate (12) is greater than the thickness of the steel cylinder protective sleeve (8) on the same side, so that the inner side of the above-mentioned steel plate protective layer (5) contacts the side wall of the steel coil to be lifted (15), and the steel cylinder protective sleeve (8) does not contact the side wall of the steel coil to be lifted (15).

6. The rubber protection device for lifting cold-rolled steel coils according to claim 5, characterized in that: The suction claw protective layer (13) and the steel cylinder protective sleeve (8) are made of cast polyurethane or natural rubber.

7. The rubber protection device for lifting cold-rolled steel coils according to claim 6, characterized in that: The Shore hardness of the polyurethane or natural rubber is 45-90 degrees.

8. The rubber protection device for lifting cold-rolled steel coils according to claim 5, characterized in that: The Shore hardness range of the rubber on the inner side of the steel plate protective layer (5) is 45-65 degrees, which plays a role in protecting the edge of the steel plate at the end face of the steel coil.

Images