A mechanical roll-changing device for a top-sealed roller table

Abstract

A mechanical roll changing device for a top-sealed roller path, belonging to the fields of metallurgy and metal processing. The present invention provides a device that can achieve mechanical roll changing in a narrow working site with obstacles. It includes a roll changing cart, a swing mechanism, a transverse movement cart, a transverse movement cart driving mechanism, an electric control cabinet, etc. The roll changing cart, the swing mechanism, and the transverse movement cart driving mechanism are each driven by a motor. The roll changing cart 1 is placed on a pre-laid roll changing track. The swing mechanism 2 and the electric control cabinet 5 are installed on the roll changing cart 1 and are connected by bolts. The transverse movement cart 3 travels on the horizontal track of the swing mechanism 2. The transverse movement cart driving mechanism 4 is installed on the swing mechanism 2 by bolts. The roll changing device of the present invention occupies a small area and can flexibly avoid various obstacles on the operation path. As long as two steel rails are laid on the maintenance passage beside the production line, the equipment of the present invention can be used to achieve full-line mechanical roll changing, and basically no modification of the existing process facilities is required.

Description

Technical Field

[0001] The invention is mainly used in the fields of metallurgy and metal processing, and can also be used in other industrial fields, and relates to a mechanical device used in a production workshop for replacing damaged or faulty rollers on a roller table with a closed top. Background Art

[0002] In industrial production, there are many rollers on production lines that transport long materials and are installed in confined spaces, such as various tunnel furnaces, hot delivery lines, continuous heat treatment furnaces, pickling tanks and other large equipment. Due to poor working conditions or to ensure product quality, the rollers of such equipment need to be replaced frequently. In order to prevent heat loss or toxic and harmful gas overflow, the top cover is generally designed to be closed, and the rollers are replaced by pulling them out from the side. Some rollers are up to four or five meters long, which makes the design of roller replacement equipment very difficult. Generally, simple lifting tools are used for manual replacement, which takes a long time and has high labor intensity for workers. In actual production, it is often necessary to wait until minor or medium repairs to replace them, or even until major repairs for centralized replacement, which will cause chain damage and seriously affect the benefits of the enterprise. Therefore, good roller replacement equipment is of great significance to improving production efficiency and maintaining smooth production.

[0003] There are two types of roll changing equipment at present. One type is simple tools, such as balance bars, balance hooks, etc., with balance weights. When working, they are hoisted by a crane to approach the roller to be replaced, and then the head of the roll changing tool is connected to the roller neck by the worker. Under the manual control of the worker, the crane slowly pulls out the roller. The disadvantages of this method are that the roll changing time is long, it is easy to cause bumps and scratches, the crane is occupied for a long time, and the workers are forced to be exposed to harsh environments. In addition, the fatal weakness of this tool is that when the roller table passes through different spans of the workshop, the difficulty of replacement increases sharply because the crane cannot reach the connection between the two spans. The other type is a special roll changing equipment (manipulator). The roll changing tool is installed on a slider that can be raised and lowered, and the slider base is fixed on a car that can move in two vertical directions on the horizontal plane. This type of equipment has an accurate running track, does not require manual adjustment, has high work efficiency, and is the direction of development. Its disadvantage is that the car body is wide and occupies a large area of ​​the site, which increases investment in disguise. The main limitation of this type of equipment is that there must be no obstacles in its operating path, but in reality this is impossible. For example, there are process pipelines, valves, instruments and cables such as gas and cooling water next to the furnace. It is too difficult to transform and promote this type of mechanical equipment. It is generally only used in critical occasions where a small number of rollers are changed frequently. Summary of the invention

[0004] The present invention provides a roller changing method and a mechanical device for a top-enclosed roller table which requires rollers to be pulled out laterally, so as to solve the problem of mechanical roller changing in a narrow working space with obstacles.

[0005] The described roll changing device includes a roll changing cart 1, a swing mechanism 2, a transverse moving cart 3, a transverse moving cart driving mechanism 4, and an electric control cabinet 5; the roll changing cart 1 is placed on a pre-laid roll changing track, and the swing mechanism 2 and the electric control cabinet 5 are installed on the roll changing cart 1 and connected by bolts; the transverse moving cart 3 travels on the horizontal track of the swing mechanism 2; the transverse moving cart driving mechanism 4 is installed on the swing mechanism 2 by bolts.

[0006] The described roll changing cart 1 includes a vehicle body 101 with steel wheels and a driving motor 102. The driving motor is fixed on the vehicle body by bolts and drives the axle to rotate through a sprocket and a chain assembled on its output shaft, so that the roll changing cart 1 travels on the track laid along the production line to reach the specified roll changing position.

[0007] The described swing mechanism 2 is a four-bar linkage mechanism, including a base 201, two cranks 202, a horizontal connecting rod 203 with a cart guide rail, an electric push rod (or hydraulic cylinder) 204, etc.; the base 201 is installed on the roll changing cart 1, the lower parts of the double cranks 202 are connected to the base 201 through pin shafts, the upper parts of the double cranks 202 are connected to the connecting rod 203 through pin shafts, the hinge point of the electric push rod (or hydraulic cylinder) 204 is fixed on the base 201, and the trunnion of the push rod (or piston rod) is connected to the middle part of one crank 202. The swing mechanism is the key component of the present invention. By the telescopic movement of the push rod 204, it drives the crank 202 to swing, driving the connecting rod 203 to make a circular motion while always maintaining a horizontal state, which not only realizes lifting but also compensates for a part of the left and right movement, enabling the roll changing cart to flexibly avoid obstacles during the traveling process.

[0008] Since the distance between the two cranks 202 is much smaller than the length of the connecting rod 203 with the transverse moving cart guide rail, and the width of the roll changing cart 1 only needs to meet the requirement of installing two cranks and leaving a swinging space, the gauge of the roll changing cart track can be reduced by 1 / 3 to 1 / 2 compared with the existing related technologies, greatly saving the floor area.

[0009] The base 201 of the swing mechanism 2 is provided with a booster spring 205, whose function is to provide an additional supporting force for the crank near the limit position of the swing, reducing the maximum load of the electric push rod by about 1 / 4 - 1 / 3, and reducing the equipment weight and equipment capacity.

[0010] The base 201 of the swing mechanism 2 is provided with a support bolt 206, which is used to position the roll changing cart 1 at the working position and directly apply a large eccentric load on the track, improving the overall rigidity of the equipment.

[0011] The described transverse trolley 3 is pulled by a chain of the driving mechanism 4 to move, and its wheels are installed on the horizontal track of the swing mechanism 2. There is a fixed arc-shaped clamping seat 300 at the neck of the vehicle body. A pressing bolt 301 is installed on the top of the vehicle head, and an eccentric sleeve 302 with a wrench is installed at the front end of the vehicle head. The center of the eccentric sleeve is connected by a pin shaft to a clamp 303 that can hold the journal of the roller to be replaced.

[0012] The arc-shaped clamping seat 300 presses the end of the roller shaft to be replaced, and the clamp 303 holds the journal of the roller to be replaced, thus fixing the roller. Since the center of gravity of the roller is far from the fixed point, under the action of gravity, large elastic deformations will occur in both the roller itself and the clamp 303, causing the distal end of the roller to tilt downward during the lifting process. The function of the eccentric sleeve 302 with a wrench and the pressing bolt 301 is to apply an upward-tilting moment to the roller, so that the roller is in a horizontal state after being lifted. This function is also not available in the prior art.

[0013] The described driving mechanism 4 of the transverse trolley includes a chain 401, a driving motor 402 with a leading sprocket, a trailing sprocket and its adjusting seat 403, a sliding sleeve 404 with a spring, etc. The chain 401 passes around the leading sprocket and the trailing sprocket to form a closed loop through the transverse trolley 3. Its end is directly fixed to the transverse trolley 3 by bolts on the trailing sprocket side, and is fixed to the transverse trolley 3 by the sliding sleeve 404 with a spring on the leading sprocket side. The driving motor 402 and the trailing sprocket adjusting seat 403 are installed on the horizontal connecting rod 203 of the swing mechanism 2.

[0014] Since the movement trajectory of the horizontal connecting rod 203 is circular motion, there is a horizontal displacement component during the ascending process. When starting to lift the roller to be replaced, due to the elastic deformation of the components, the bearing seat of the roller cannot immediately leave the base. The transverse trolley 3 will drag the roller along with the horizontal movement component of the swing mechanism 2, resulting in scraping and scratching. The setting of the sliding sleeve 404 with a spring creates a buffer between the transverse trolley 3 and the driving chain 401. The transverse trolley 3 is allowed to move horizontally passively within a certain range to adapt to the adhesion between the roller bearing seat and the base. This is also the key innovation point for the present invention to adopt the four-bar linkage mechanism. In addition, when the transverse trolley 3 moves towards the trailing sprocket direction, the sliding sleeve 404 with a spring can absorb the slack chain above, reduce the pre-tension of the chain, and extend the service life of the chain.

[0015] The advantages of the present invention are as follows:

[0016] 1. It can flexibly avoid various obstacles on the operation path. As long as two steel rails are laid on the maintenance passage beside the production line, the equipment of the present invention can be used to realize full-line mechanized roll replacement, and almost no modification is required for the existing process facilities.

[0017] 2. Compared with the currently commonly used roll changing method, the equipment of the present invention can achieve accurate actions without manual support. Workers only need to operate buttons and perform simple auxiliary work, liberating them from heavy labor and harsh working environments, and also avoiding damage to related facilities during the process of pulling out the rolls.

[0018] 3. The roll changing time of the present invention is significantly shortened, only 1 / 4 - 1 / 3 of the currently commonly used roll changing method, and the overhead crane occupancy time is only 1 / 10 - 1 / 5 of the currently commonly used roll changing method, improving work efficiency.

[0019] 4. Due to the shortened roll changing time, the rolls that originally needed to be replaced during minor or medium repairs can now be replaced during the daily production shutdown, avoiding the equipment running with damage and chain damage. Thus, a large amount of spare parts costs can be saved.

[0020] In summary, the economic and social benefits of the present invention are very obvious. Since the roll changing equipment of the present invention is applicable to a very large number of production lines and is easy to implement, it brings hope for changing the old production mode and can greatly improve the modernization level of industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention. It includes a roll changing cart 1, a swing mechanism 2, a transverse transfer cart 3, a transverse transfer cart drive mechanism 4, and an electric control cabinet 5.

[0022] Figure 2 is Figure 1 the left view of

[0023] Figure 3 A specific schematic diagram of the roll changing device. DETAILED DESCRIPTION OF THE INVENTION

[0024] Figure 3 It shows a specific embodiment of the present invention.

[0025] As Figure 3 shown, it is a cross-sectional view of a billet tunnel furnace in a steel plant, where A01 is the furnace body of the tunnel furnace, and the rollers A02 of the internal roller table are fixed on the supports outside the side walls of the furnace body through bearing seats. Due to the limitation of the drawing size, only the operation side part is intercepted, and the transmission side is symmetric with the operation side relative to the center line. There is a drive motor of the roller A02 connected to the roller A02 outside the end of the roller on the transmission side. Gas pipelines A03 are distributed on the upper part and side of the furnace body A01, roller cooling water pipelines and valves A04 are distributed on the lower part of the side, burner cooling water valves A05 and cooling water pipelines A06 are arranged on the upper part of the side, and there is another set of roller tables A07 separated by a maintenance passage beside the tunnel furnace.

[0026] As Figure 3As shown, the tracks of the roll-changing device of the present invention are arranged on the maintenance passage outside the operation side of the tunnel furnace. The roll-changing device of the present invention is usually placed in a position that does not affect production, which can be on the tracks or lifted and moved to other places. Before changing the roll, a worker operates the button to make the transverse trolley 3 in the position shown in the figure or the middle position of its track, and the swing mechanism 2 is in a state to the right of the position shown in the figure to avoid the cooling water pipe A06. Then drive the roll-changing cart 1 near the roll A02 to be replaced. Another worker removes the connecting bolts of the bearing seat of the roll A02 and the coupling between the roll and the drive motor.

[0027] Steps for changing the roll: 1) The cooling water pipe A06 is irregularly distributed along the production line. The swing mechanism 2 swings to the left at the gap between them, so that the horizontal connecting rod is below the cooling water pipe A06; 2) Start the roll-changing cart 1 to align the center line of the transverse trolley with the center line of the roll A02 to be replaced; 3) Start the transverse trolley 3 and move it to near the leftmost end; 4) The swing mechanism 2 continues to swing downward and cooperates with the movement of the transverse trolley 3 to make the arc-shaped clamp seat 300 press on the roll shaft head; 5) The worker tightens the support bolt 206; 6) The worker hangs the clamp 303 on the eccentric sleeve 302 through the pin, turns the wrench on the eccentric sleeve 302 under the compression bolt 301 and tightens the bolt; 7) Start the swing mechanism 2 to make the roll A02 to be replaced leave the upper surface of the support, and make the lower surface of the roll body higher than the upper surface of the support; 8) Start the transverse trolley 3 and move it to the right until the roll is completely withdrawn from the furnace body A01; 9) Start the roll-changing cart 1 to make the center line of the transverse trolley at the gap of the cooling water pipe A06; 10) Start the swing mechanism 2 and the transverse trolley 3 to make the roll in a position suitable for hoisting and leave a margin for the transverse trolley 3 to move to the right; 11) Hang the roll A02 with the overhead crane wire rope; 12) Loosen the compression bolt 301 and remove the clamp 303; 13) Start the transverse trolley 3 and move it to the right limit. The leftmost side of the vehicle head is above the right of the roll A02 shaft head, and the overhead crane lifts the roll A02 away (shown as A02a in the figure).

[0028] For the case of crossing the span, the first 9 steps are the same. 10) Start the swing mechanism 2 to make it in a position where the roll-changing cart 1 can pass along the production line; 11) Start the roll-changing cart 1 to make it in a position suitable for the overhead crane to operate; 12) Start the swing mechanism 2 and the transverse trolley 3 again to make the roll in a position suitable for hoisting and leave a margin for the transverse trolley 3 to move to the right; 13) Hang the roll A02 with the overhead crane wire rope; 14) Loosen the compression bolt 301 and remove the clamp 303; 15) Start the transverse trolley 3 and move it to the right limit. The leftmost side of the vehicle head is above the right of the roll A02 shaft head, and the overhead crane lifts the roll A02 away (shown as A02a in the figure).

Claims

1. A mechanical roll changing device for a top-sealed roller table, characterized in that It includes a roll-changing cart (1), a swing mechanism (2), a transverse transfer cart (3), a transverse transfer cart drive mechanism (4) and an electric control cabinet (5); the roll-changing cart (1) is placed on the roll-changing track, the swing mechanism (2) and the electric control cabinet (5) are installed on the roll-changing cart (1), and the base of the swing mechanism (2) is connected to the transverse transfer cart (3) by bolts; the wheels of the transverse transfer cart (3) are installed on the horizontal track of the swing mechanism (2); the transverse transfer cart drive mechanism (4) is installed on the swing mechanism (2). The said transverse transfer cart (3) is pulled by a chain of the transverse transfer cart drive mechanism (4) to move. Its wheels are installed on the horizontal track of the swing mechanism (2). There is a fixed arc-shaped clamping seat at the neck of the transverse transfer cart. A pressing bolt is installed on the top of the front end of the transverse transfer cart. An eccentric sleeve with a wrench is installed at the front end of the head of the transverse transfer cart. The center of the eccentric sleeve is connected by a pin shaft to a clamp that can hold the journal of the roll to be replaced. The said swing mechanism (2) is a four-bar linkage mechanism, including a base, a double crank, a horizontal connecting rod with a guide rail, an electric push rod or a hydraulic cylinder, and a pin shaft; the base is installed on the roll-changing cart (1), the lower part of the double crank is connected to the base by a pin shaft, the upper part of the double crank is connected to the connecting rod by a pin shaft, the hinge point of the electric push rod or the hydraulic cylinder is fixed on the base, and the trunnion of the push rod in the electric push rod or the piston rod in the hydraulic cylinder is connected to the middle part of a crank.

2. The roll changing device according to claim 1, characterized in that, The said roll-changing cart (1) includes a vehicle body with steel wheels and a drive motor. The drive motor is fixed to the vehicle body with steel wheels by bolts, and the axle is driven to rotate by a sprocket and a chain assembled on the output shaft of the drive motor.

3. The roll-changing device according to claim 1, characterized in that, The base of the said swing mechanism (2) is provided with a booster spring and a support bolt.

4. The roll-changing device according to claim 1, characterized in that, The said transverse transfer cart drive mechanism (4) includes a chain, a drive motor with a head sprocket, a tail sprocket and its adjusting seat, and a sliding sleeve with a spring. The drive motor and the tail sprocket adjusting seat are installed on the horizontal connecting rod of the swing mechanism (2). The chain on the tail sprocket side is directly fixed to the transverse transfer cart (3) by bolts, and the chain on the head sprocket side is fixed to the transverse transfer cart (3) by a sliding sleeve with a spring.

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