CN104210958A - RH steel ladle vehicle-mounted lifting method and device - Google Patents

Abstract

The invention discloses an RH steel ladle vehicle-mounted lifting method and device. A vacuum chamber transverse moving trolley is arranged on a refining operation platform and moves a vacuum chamber to the refining treatment position, a trolley wheel set swings up, a trolley frame descends, a force bearing pillow on the trolley frame falls on a wheel track or other fixed supporting points of the refining operation platform, a hot bending pipe above the refining operation platform descends on the vacuum chamber and a vacuum bend to connect the vacuum chamber and the vacuum bend, then, the vacuum chamber transverse moving trolley enables a vehicle-mounted steel ladle lifting appliance to descend, and after a steel ladle transport cart transports a steel ladle to the refining treatment position from the steel ladle lifting position, the vehicle-mounted lifting appliance lifts the steel ladle to the refining position for vacuum refining. When the vacuum chamber is replaced, the hot bend pipe is firstly lifted up, the wheel set swings to lift up the trolley frame, the force bearing pillow is made to be separated from the supporting points, the trolley transversely moves to the lifting position of the vacuum chamber, an old vacuum chamber is lifted out of the vacuum chamber lifting position, and a new vacuum chamber is lifted into the vacuum chamber lifting position. According to the method and device, the design and manufacturing difficulty of the steel ladle lifting device is reduced, and the running safety of the device is improved.

Description

A method and device for vehicle-mounted lifting of RH ladle

technical field

The invention belongs to the field of vacuum degassing devices used for refining outside the furnace in the metallurgical industry, and in particular relates to a vehicle-mounted method and device for lifting RH ladles.

Background technique

Molten steel vacuum circulation degassing (RH) technology is a secondary refining process of molten steel, which is a necessary means of out-of-furnace refining for the production of high-quality steel. RH vacuum refining equipment was originally used for degassing molten steel. Its metallurgical principle is to rely on pressure difference to lift molten steel into a vacuum chamber, and to circulate molten steel by blowing argon, and use the vacuum environment to achieve the purpose of degassing (N2, H2, O2). , which has the advantages of fast reaction speed, high vacuum degree and good metallurgical effect. In recent years, due to the application of overhead oxygen lance technology, RH vacuum refining has more functions such as efficient oxygen blowing forced decarburization, CO secondary combustion heating, powder spraying desulfurization, etc., making RH technology more widely used.

For RH vacuum refining, the dip tube in the vacuum chamber must be inserted into the molten steel in the ladle to form a closed space for pumping and generate a low-pressure environment. The technical means to achieve this goal has undergone many innovations, such as US patent US3756584, Chinese patents CN101081683A, CN201250050Y, CN201694756U, CN201485193U, etc. From the so-called "up-moving type" in which the ladle does not move and the vacuum chamber moves up and down at the beginning, it has evolved into the so-called "down-moving" technology in which the vacuum chamber does not move while the ladle moves up and down. In the down-moving technology, technologies such as wire rope winch lifting ladle, fixed hydraulic cylinder lifting ladle, hydraulic lifting ladle and hydraulic jacking ladle have been developed, but these technologies have complex structures, difficult manufacturing, and large floor space. shortcoming. For example, the most widely used hydraulic jacking ladle technology currently requires excavating a deep foundation pit of more than 7m underground in the vacuum refining treatment position, and installing a complex lifting frame and a high-power hydraulic system, which is not only difficult to manufacture, install, and debug, but also There are potential safety hazards during operation, and accidents involving casualties have occurred. In the modern RH vacuum refining production, in order to facilitate the replacement of the vacuum chamber whose refractory life has expired, the process of placing the vacuum chamber on a mobile trolley is adopted. The mobile trolley can carry the vacuum chamber to translate between the refining treatment position and the preheating lifting position.

The advantage of lifting or lifting the ladle is that no deep foundation pit needs to be excavated, but the existing lifting or lifting technology has not been widely used. The height is relatively insufficient for the lifting device that needs to meet the lifting stroke of 2.5m~3m. At the same time, it also needs to meet the horizontal direction of the ladle to enter and exit the lifting device. Therefore, the stress state of the lifting device is poor, the structure becomes complicated, and the design and manufacture are more difficult. , Maintenance is not easy. Moreover, in the modern RH vacuum refining production process, it is not only necessary to move the ladle from the ladle hanger to the refining treatment position, and lift the ladle up and down at the refining treatment position, but also to remove the vacuum chamber whose service life has expired, and Replace with a new vacuum chamber. This further limits the scope of application of existing lifting or elevating ladle technologies.

Chinese patent CN203682934U discloses a RH vehicle-mounted hydraulic lifting ladle device, and proposes a variety of schemes for setting a ladle lifting device on a vacuum chamber traverse trolley, solving the problem that the fixed hydraulic lifting ladle device is on the rail platform of the traverse trolley However, when the entire load is only transmitted to the structure through the wheels, the wheels are under a large force, the load distribution of the frame is unreasonable, and the self-weight of the device is relatively large.

The existing engineering way of inserting the dip tube into the molten steel is summarized as follows:

Contents of the invention

In view of this, the object of the present invention is to provide a vehicle-mounted method and device for lifting RH ladles suitable for use in RH vacuum refining devices, so as to reduce the difficulty of design and manufacture and improve operational safety.

The purpose of the present invention is achieved through the following technical solutions:

A method for vehicle-mounted lifting of RH molten steel ladle, the vacuum chamber traverse trolley with swing lifting wheel set and steel ladle vehicle lifting spreader moves the vacuum chamber to the refining treatment position on the refining operation platform, and the trolley wheel set swings Put away, the trolley frame descends, the bearing pillow on the frame falls onto the wheel track or other fixed support points of the refining operation platform, the hot bending pipe above the refining operation platform descends to the vacuum chamber and the vacuum elbow The two are connected, and then the ladle vehicle-mounted lifting sling is lowered by the vacuum chamber traversing trolley. After the ladle transport vehicle transports the steel ladle to the refining treatment position, the ladle vehicle-mounted lifting sling lifts the ladle to the refining position for vacuum processing. Refining, after refining, the steel ladle is put back into the ladle transport vehicle by the ladle vehicle-mounted lifting sling, and then the ladle transport vehicle transports the steel ladle to the ladle hanging position, and then uses the crane to lift the processed ladle away and hoist it to be processed The steel ladle, and then the ladle transporter transports the ladle to the refining treatment position to start the next treatment operation.

Further, when the vacuum chamber needs to be off-line, the hot bending pipe is raised first, the wheel set of the trolley is swung down, the frame of the trolley is lifted, the bearing pillow is separated from the wheel track or other fixed support points, and the vacuum chamber moves the trolley laterally Take the vacuum chamber away from the refining treatment position and walk to the lifting position of the vacuum chamber, then use the crane to lift the old vacuum chamber and hoist the new vacuum chamber, then move the new vacuum chamber to the refining treatment position, lower the frame, and then lower the hot bending pipe Wait for the next vacuum treatment.

A vehicle-mounted lifting RH ladle device for realizing the above method, including a vacuum chamber traverse trolley, the vacuum chamber traverse trolley includes a vehicle frame with a bearing pillow, a swinging and lifting wheel set, and a steel ladle vehicle-mounted Lifting spreader.

Further, the vehicle frame is a frame structure composed of two box-shaped main beams and two box-shaped end beams, four load-bearing sleepers are located at the bottom of the main beams, the wheel sets are hinged on the end beams, and the vehicle-mounted lifting spreader is installed on the main girder.

Further, the wheel set includes four sets of wheels, two sets of driving wheels, two sets of driven wheels or four sets of driving wheels, and the four sets of wheels can support the weight of the vacuum chamber and the weight of the trolley device itself.

Further, the vehicle-mounted lifting hanger for ladle includes a lifting drive device, a load-bearing frame and a ladle hook, the ladle hook is set at the bottom of the load-bearing frame, and the lift drive device is set on the main beam of the vehicle frame, The load-bearing frame is hinged on the lifting drive device.

Further, the lifting drive device is hydraulic drive or electric drive.

The beneficial effects of the inventive method and device are as follows:

1. The ladle hydraulic lifting spreader is integrated into the frame lifting trolley device and walks with the trolley, avoiding the complexity of the spreader caused by the existing lifting or lifting ladle technology that needs to deal with the horizontal entry and exit of the vacuum chamber. .

2. The ladle hydraulic lifting spreader is integrated into the frame lifting trolley device to walk with the vehicle, which avoids the problem that the existing fixed hydraulic lifting or elevating ladle technology is difficult to achieve the required hydraulic lifting stroke due to the space height limit under the track.

3. In view of the working condition that the load of the frame lifting trolley device during the walking period is less than that during the vacuum refining treatment period, the swing wheel set and the frame load-bearing pillow are respectively used to bear the loads under two different working conditions, which reduces the load of the wheel set. The stress distribution of the frame is improved, and the weight of the frame is reduced.

Other advantages, objects and features of the present invention will be set forth in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the investigation and research below, or can be obtained from It is taught in the practice of the present invention. The objects and other advantages of the invention may be realized and attained by the following specification.

Description of drawings

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 is the structural representation of a kind of hydraulically driven lifting spreader of device of the present invention;

Fig. 2 is a schematic diagram of the refining treatment state of the device of the present invention;

Fig. 3 is the walking state schematic diagram of device of the present invention;

In the figure, 1 is a ladle transport vehicle; 2 is a ladle; 3 is a refining operation platform; 4 is a vacuum chamber traverse trolley; 5 is a vacuum chamber; 6 is a hot bending pipe; 7 is a vacuum elbow; Lifting sling; 4b is a wheel set; 4c is a bearing pillow.

Detailed ways

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, but not for limiting the protection scope of the present invention.

As shown in the figure, a method of hydraulically lifting the RH ladle, a vacuum chamber traverse trolley 4 with a swing lifting wheel set and a ladle hydraulic lifting sling moves the vacuum chamber 5 to the refining process on the refining operation platform 3 After positioning, the wheel set 4b of the trolley swings and is retracted, the frame of the trolley descends, and the bearing pillow 4c on the frame falls onto the wheel track or other fixed supports of the refining operation platform, and the hot bending pipe 6 above the refining operation platform Descend to the vacuum chamber 5 and the vacuum elbow 7 to connect the two, then, the vacuum chamber traversing trolley lowers the ladle hydraulic lifter 4a, and after the ladle transport vehicle 1 transports the ladle 2 to the refining treatment position, The ladle hydraulic lifting sling lifts the ladle to the refining position for vacuum refining. After refining, the ladle hydraulic lifting sling puts the ladle back into the ladle transporter, and then the ladle transporter transports the ladle to the ladle lifting position. Then use the crane to hoist the processed ladle away and hoist the new ladle to be processed, and then the ladle transporter transports the ladle to the refining treatment position to start the next refining treatment.

In this embodiment, when the vacuum chamber needs to be off-line, firstly, the hot bending pipe is raised, and the wheel set of the trolley is lowered by swinging. The moving trolley takes the vacuum chamber away from the refining treatment position and walks to the lifting position of the vacuum chamber, then uses the crane to lift the old vacuum chamber away and the new vacuum chamber, and the vacuum chamber traverse trolley moves the vacuum chamber to the refining treatment position, Waiting for the next refining operation. The vacuum chamber traversing trolley in this embodiment includes a vehicle frame and a rotatable and liftable swing wheel set 4b arranged on the vehicle frame, and the vehicle frame is also provided with a ladle hydraulic lifting hoist 4a and a bearing pillow 4c; The ladle hydraulic lifting hanger 4a includes a lifting hydraulic cylinder, a load-bearing frame and a ladle hook, the ladle hook is arranged at the bottom of the load-bearing frame, the lifting hydraulic cylinder is arranged on the vehicle frame, and the bearing The force frame is arranged on the lifting hydraulic cylinder; the wheel set includes four groups of wheels, wherein two groups are driving wheels, two groups are driven wheels or four groups are driving wheels, and the four groups of wheels can support the weight of the vacuum chamber and The weight of the trolley device itself.

This embodiment has the following advantages: 1. The ladle hydraulic lifting sling is integrated into the vehicle frame lifting trolley device to walk with the trolley, avoiding the need to deal with the vacuum chamber horizontally entering and exiting the lifting device in the existing lifting or lifting ladle technology. The resulting spreader complicates the problem. 2. The ladle hydraulic lifting spreader is integrated into the frame lifting trolley device to walk with the vehicle, which avoids the problem that the existing fixed hydraulic lifting or elevating ladle technology is difficult to achieve the required hydraulic lifting stroke due to the space height limit under the track. 3. In view of the working condition that the load of the frame lifting trolley device during the walking period is less than that during the vacuum refining treatment period, the swing wheel set and the frame load-bearing pillow are respectively used to bear the loads under two different working conditions, which reduces the load of the wheel set. The stress distribution of the frame is improved, and the weight of the frame is reduced.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements, without departing from the spirit and scope of the technical solution, should be included in the scope of the claims of the present invention.

Claims (7)

1. the method for a vehicle-mounted lifting RH steel ladle, it is characterized in that: after vacuum chamber being moved to refining treatment position with the vacuum chamber transverse-moving trolley of oscillating lifting wheel group and steel ladle vehicle-mounted lifting suspender on refining operation platform, bogie wheels group swings and packs up, chassis vehicle frame declines, on vehicle frame load pillow fall on wheel rail or refining operation platform other fixed pedestal point on, hot-bending pipe above refining operation platform drops on vacuum chamber and vacuum elbow and the two is coupled together, then, vacuum chamber transverse-moving trolley falls steel ladle vehicle-mounted lifting suspender, after steel ladle is transported to refining treatment position by steel ladle transport vehicle, steel ladle is promoted to refining position and carries out vacuum refining by steel ladle vehicle-mounted lifting suspender, after refining, by steel ladle vehicle-mounted lifting suspender, steel ladle is put back to steel ladle transport vehicle, then ladle is transported to ladle bull ladle position by steel ladle transport vehicle, then utilize crane to be hung away by the ladle be disposed and hang pending ladle, then ladle is transported to refining treatment position by steel ladle transport vehicle, start to process operation next time.

2. the method for vehicle-mounted lifting RH steel ladle according to claim 1, it is characterized in that: when vacuum chamber needs to roll off the production line, first hot-bending pipe is risen, bogie wheels group is fallen in swing, chassis vehicle frame is by jack-up, load pillow separating wheel track or other fixed pedestal point, vacuum chamber transverse-moving trolley leaves refining treatment position with vacuum chamber and runs to vacuum chamber lifting position, then utilize crane to hang away old vacuum chamber and hang new vacuum chamber, again new vacuum chamber is moved to refining treatment position, fall vehicle frame, then fall hot-bending pipe and wait for application of vacuum next time.

3. one kind for realizing the device of the vehicle-mounted lifting RH steel ladle of method described in claim 1 or 2, comprise vacuum chamber transverse-moving trolley, it is characterized in that: described vacuum chamber transverse-moving trolley comprises the vehicle frame of band load pillow, the wheel group of oscillating lifting and steel ladle vehicle-mounted lifting suspender.

4. the device of vehicle-mounted lifting RH steel ladle according to claim 3, it is characterized in that: the frame-type structure that described vehicle frame is made up of two box type girders and two box end carriages, four load pillows are positioned at bottom girder, and wheel group is hinged on end carriage, and vehicle-mounted lifting suspender is arranged on girder.

5. the device of vehicle-mounted lifting RH steel ladle according to claim 3, it is characterized in that: described wheel group comprises four groups of wheels, wherein two groups be driving wheel, two groups be that flower wheel or four groups are driving wheel, described four groups of wheels can support the weight of vacuum chamber and the own wt of trolley device.

6. the device of vehicle-mounted lifting RH steel ladle according to claim 3, it is characterized in that: described steel ladle vehicle-mounted lifting suspender comprises lifting drive, load frame and steel ladle suspension hook, described steel ladle suspension hook is arranged on load frame bottom, described lifting drive is arranged on vehicle frame main beam, and described load frame is hinged on lifting drive.

7. the device of vehicle-mounted lifting RH steel ladle according to claim 6, is characterized in that: described lifting drive is hydraulic-driven or driven by power.