CN110227717A - A kind of changing rig and method - Google Patents

Abstract

The invention relates to the field of roll changing in rolling mills, in particular to a roll changing device, which at least includes a cart, a tractor and a roll system, and also includes a nitrogen spring, a pair of upper rails, a pair of lower rails, a handle and a traction hook. The system includes an upper intermediate roll, an upper work roll, a lower work roll and a lower intermediate roll, between the upper intermediate roll and the upper work roll chock, between the upper work roll and the lower work roll chock, and between the lower work roll and the lower intermediate roll A pair of nitrogen springs are arranged between the roller bearing housings, and a tractor is slid on the cart, and the moving direction of the tractor and the cart is perpendicular to the working line of the unit, and the cart is located on both sides of the tractor from above. Fix the upper track and the lower track in turn. The present invention effectively solves the problems of bulky equipment, large space and high cost in the prior art due to the technical means of dragging other roll systems by the lower working roll and hoisting the roll system from the height direction, and further realizes efficient and intensive roll changing Light technical effect.

Description

Roll changing device and method

technical field

The invention relates to the field of roll changing in rolling mills, in particular to a roll changing device and method.

Background technique

The six-high rolling mill is widely used in the plastic forming process of various metal materials. The roll changing system of the six-high rolling mill directly determines the production rhythm of the operation line and the space scale of the unit equipment. Since the roll changing cycle of the backup roll system is long and the roll surface accuracy of the intermediate roll and the working roll has a great influence on the product surface quality and product accuracy, the research on the roll changing system of the six-high mill mainly focuses on the intermediate roll and the working roll The roll changer is unfolded.

The roll change of the six-high rolling mill is the process of pulling the old roll system out of the rolling mill and pushing the new roll system into the rolling mill by the roll changing car. The roll change system of the traditional six-high rolling mill is to set separate roll change tracks for the upper intermediate roll system, upper work roll system, lower work roll system and lower intermediate roll system in the roll change equipment, and keep the roll change equipment away from the rolling mill. The transmission side of the roll changing equipment completes the hoisting of the old roll system out of the roll changing equipment and the hoisting of the new roll system into the roll changing equipment. Therefore, the traditional roll changing system of a six-high rolling mill has the following problems in use.

1. Huge space. Since the roll changing equipment has separate roll changing tracks for the upper intermediate roll system, upper working roll system, lower working roll system and lower intermediate roll system, the roll changing equipment occupies a large space in the height direction. Moreover, the roll changing equipment must be far enough away from the rolling mill so that the roll system can be hoisted out or hoisted in from the transmission side of the roll changing equipment, so the roll changing equipment corresponding to the roll changing system takes up a large space in the transverse span.

Second, the equipment is bulky. The huge space overhead of the roll changing equipment corresponding to the traditional roll changing system in the height direction leads to the heavy tonnage of the roll changing equipment, and the large height of the equipment results in a high center of gravity of the equipment. The large tonnage and high center of gravity limit the moving speed of the roll changing equipment, thereby greatly reducing the roll changing speed and production rhythm.

Three, the cost is high. The huge space requirement of the traditional roll changing system results in a huge workshop and land occupation, and the heavy equipment makes the design and manufacturing cost of the roll changing equipment very high. These are a great waste of social resources and are very undesirable.

Contents of the invention

The invention provides a roll changing device, which solves many problems in the prior art and realizes the technical effect of high-efficiency roll changing.

The technical problem solved by the present invention can adopt following technical scheme to realize:

A roll changing device at least includes a cart, a tractor and a roll system, and also includes a nitrogen gas spring, a pair of upper rails, a pair of lower rails, a handle and a traction hook, and the roll system includes an upper intermediate roll, an upper working roll, The lower work roll and the lower intermediate roll, a pair of nitrogen gas is set between the upper intermediate roll and the upper work roll chock, between the upper work roll and the lower work roll chock, and between the lower work roll and the lower intermediate roll chock spring, a tractor is slid on the cart, and the moving direction of the tractor and the cart is perpendicular to the working line of the unit. The handle is fixed at one end of the lower work roll, and the traction hook is detachably connected to one end of the tractor.

There are a pair of grooves on the opposite surface of the bearing seat at the two ends of the upper intermediate roll and the upper work roll, the opposite surface of the bearing seat at the two ends of the upper work roll and the lower work roll, and the opposite surface of the bearing seat at the two ends of the lower work roll and the lower intermediate roll. Nitrogen gas is set in the groove on the opposite surface of the upper intermediate roll and the upper work roll chock, the groove on the opposite surface of the upper work roll and the lower work roll chock, and the groove on the opposite surface of the lower work roll and lower intermediate roll chock spring,

There is a gap of 2mm between the nitrogen gas spring and the inner wall of the groove.

The upper track is composed of two movable rails and three fixed rails, a movable rail is arranged between the three fixed rails, one end of the movable rail is hinged to the fixed rail, and the other end of the movable rail is in contact with the fixed rail.

The towing hook is composed of a pair of brackets, a pair of rotating shafts, a pair of hooks and a linkage rod. The brackets are relatively parallel and fixed at one end of the tractor. The lower surface of the other end of the hook is provided with a guide surface and a connecting groove, and a linkage rod is fixed between the other ends of the pair of hooks.

The tractor is located on the lower track.

A roll changing method, comprising the above-mentioned roll changing device, further comprising the following steps,

The first step is to release the pressure of the rolling mill on the roll system, and the nitrogen spring will push the rollers in the roll system by 10mm-30mm.

In the second step, the hook of the tractor is connected with the handle, the tractor moves to the rear limit position on the cart, drags the roller system to the upper track and the lower track, and the cart moves to the rear limit position.

The third step is to disconnect the connection between the hook and the handle, and the upper intermediate roll, upper working roll, and lower working roll in the roller system are hoisted by the crane from top to bottom in sequence, and the movable rail of the upper track is opened, and then the crane is taken out by the crane. The lower intermediate roll of the roll train.

The fourth step is to hoist the lower intermediate roll by row crane, close the movable rail of the upper track, and then hoist the lower working roll, upper working roll and upper intermediate roll.

In the fifth step, the cart moves to the front limit position, the tractor moves to the front limit position, and pushes the roll system into the rolling mill.

The beneficial effects of the present invention are: due to the adoption of the technical means of dragging other roll systems through the lower working roll and hoisting the roll systems from the height direction, the problems of heavy equipment, large space and high cost in the prior art are effectively solved, and further The technical effect of high efficiency, compactness and convenient roll change is realized.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a structural schematic diagram of the present invention.

Figure 2 is a side view of the roll set of the present invention.

Fig. 3 is a front view of the roller system of the present invention.

Fig. 4 is a side view of the hook of the present invention.

Fig. 5 is a top view of the hook of the present invention.

Figure 6 is a side view of the present invention.

Fig. 7 is a schematic diagram of the upper track structure of the present invention.

In the figure: 1-cart; 2-tractor; 3-nitrogen spring; 4-upper rail; 5-lower rail; 6-handle; 7-traction hook; 11-lower intermediate roll; 12-movable rail; 13-fixed rail; 14-support; 15-rotating shaft; 16-hook; 17-linkage rod; 18-guiding surface;

Detailed ways

Example 1:

Referring to Figures 1-7, it is a schematic structural view of Embodiment 1 of the present invention, a roll changing device, at least including a cart 1, a tractor 2 and a roller system, and is characterized in that it also includes a nitrogen spring 3, a pair of upper rails 4, A pair of lower track 5, handle 6 and traction hook 7, the roll system includes upper middle roll 8, upper work roll 9, lower work roll 10 and lower middle roll 11, the upper middle roll 8 and upper work roll 9 A pair of nitrogen springs 3 are arranged between the bearing housings, between the bearing housings of the upper working roll 9 and the lower working roll 10, and between the bearing housings of the lower working roll 10 and the lower intermediate roll 11, and a tractor is set slidingly on the cart 1 2. The moving direction of the tractor 2 and the cart 1 is perpendicular to the working line of the unit, and the cart 1 is located on both sides of the tractor 2, and the upper rail 4 and the lower rail 5 are sequentially fixed from top to bottom, and the handle 6 is fixed At one end of the lower working roll 10 , the traction hook 7 is detachably connected to one end of the tractor 2 .

In actual use: firstly, the rolling mill is stopped, and the rolling pressure on the roll system of the rolling mill is released. At the same time, the nitrogen spring 3 is stretched to push the lower work roll 10, the upper work roll 9 and the upper middle roll 8, so that the lower middle roll 11, the lower work roll 10. The upper working roll 9 and the upper intermediate roll 8 are separated from each other due to the nitrogen spring 3, and then the cart 1 is started to move the cart to the roll changing port of the rolling mill, and then the tractor 2 moves towards the rolling mill. When it is near, the traction hook 7 on the tractor 2 is connected with the handle 6, and then the tractor 2 is controlled to be far away from the rolling mill, and the tractor 2 pulls the handle 6 through the traction hook 7, so that the lower intermediate roll 11, the lower working roll 10, and the upper working roll Roller 9 and upper intermediate roll 8 follow and move, the pulleys on both sides of the lower intermediate roll 11 enter the lower track 5, and the pulleys on both sides of the lower working roll 10 enter the upper track 4, then start the cart 1 to move away from the rolling mill and move to the rear limit position , and then hoist the upper intermediate roll 8, upper working roll 9, lower working roll 10 and lower intermediate roll 11 sequentially by crane or lifting equipment, and then reversely hoist the new roll system to the upper rail 4 on the cart 1 And on the lower track 5, then through the cart 1 and the tractor 2, the roll system is sent into the rolling mill, the rolling mill applies pressure to the roll system, the nitrogen spring 3 is compressed, and the roll system contacts.

Example 2:

On the basis of Embodiment 1, with reference to Fig. 2 and Fig. 3: the opposite surface of the bearing seat at the two ends of the upper intermediate roll 8 and the upper work roll 9, the opposite surface of the bearing seat at the two ends of the upper work roll 9 and the lower work roll 10, and the lower A pair of grooves are formed on the opposite surfaces of the bearing housings at both ends of the work roll 10 and the lower intermediate roll 11, and the grooves on the opposite surfaces of the bearing housings of the upper intermediate roll 8 and the upper work roll 9, the bearings of the upper work roll 9 and the lower work roll 10 A nitrogen spring 3 is arranged in the groove on the opposite surface of the seat and the groove on the opposite surface of the lower work roll 10 and the lower intermediate roll 11 bearing seat.

In actual use: when the roll system is in the rolling mill, the nitrogen spring 3 is compressed due to the extrusion force of the rolling mill on the roll system, and the roll system works normally. 3 When stretching, the rollers are lifted up to facilitate the replacement of the rollers.

Embodiment 3:

On the basis of Embodiment 1, referring to Fig. 2 and Fig. 3 : the nitrogen gas spring 3 has a gap of 2 mm with the inner wall of the groove.

In actual use: a gap of 2mm can ensure that the roll system does not come into contact with the outer wall of the nitrogen spring 3 when it is working in the rolling mill, reducing friction. Due to the relatively heavy self-weight of the roll system, the nitrogen spring 3 is relatively stable between the roll systems. It will not roll over when moving.

Embodiment 4:

On the basis of Embodiment 1, referring to Fig. 1, Fig. 6 and Fig. 7: the upper track 4 is composed of two movable rails 12 and three fixed rails 13, and movable rails are arranged between the three fixed rails 13 12. One end of the movable rail 12 is hinged to the fixed rail 13, and the other end of the movable rail is in contact with the fixed rail 13.

In actual use: when hoisting the lower intermediate roller 11, the movable rail 12 is erected, and then the lower intermediate roller 11 is hoisted, and the wider bearing seat of the lower intermediate roller 11 can be realized by opening and closing the movable rail 12. The narrow upper track 4 is smoothly loaded into or lifted out.

Embodiment 5:

On the basis of Embodiment 1, referring to Fig. 4, Fig. 5 and Fig. 7: the tow hook 7 is composed of a pair of brackets 14, a pair of rotating shafts 15, a pair of hooks 16 and a linkage rod 17, and the brackets 14 are relatively parallel Fixed on one end of the tractor 2, one end of a pair of hooks 16 is respectively hinged in a pair of brackets 14 through a rotating shaft 15, and the lower surface of the other end of a pair of hooks 16 has a guide surface 18 and a connecting groove 19. The linkage rod 17 is fixed between the other ends of the hook 16 .

In actual use: push and pull the handle 6 through the two hooks 16 at the same time, so that the roller system will not shift when it moves, and the linkage rod 17 can ensure that the two hooks 16 are synchronized when rotating with the rotating shaft 15 as the hinge point, so that the hooks 16 lifts at the same angle, and when the hook 16 hits the handle 6 through the guide surface 18, the handle 6 first contacts the guide surface 18, and because the guide surface 18 has a slope, the hook 16 is lifted, and then the handle 6 enters the connecting groove 19 Inside, the hooking is completed, and then the tractor 2 moves back and forth to pull the bracket 14, the bracket 14 drives the hook 16 through the rotating shaft 15, the hook 16 drives the handle 6 to move, and the handle 6 drives the roller system to move, when the roller system is hoisted from the cart 1 When turning over the handle 6 to the direction of the tractor 2, it can prevent that the roller system cannot be hoisted normally when it is transferred by the crane.

Embodiment 6:

On the basis of Embodiment 1, referring to FIG. 1 : the tractor 2 is located on the lower rail 5 .

In actual use: the tractor 2 is located on the lower track 5, which can save the erection of the track of the tractor 2, reduce the load of the cart 1, and save resource input at the same time.

Embodiment 7:

Referring to Figures 1-7: a method for changing rolls, including a roll changing device as described above, and also includes the following steps,

In the first step, the rolling pressure of the rolling mill on the roll system is released, and the nitrogen spring 3 pushes the rollers in the roll system by 10mm-30mm.

In the second step, the hook 16 of the tractor 2 is connected with the handle 6, the tractor 2 moves to the rear limit position on the cart 1, drags the roller system to the upper track 4 and the lower track 5, and the cart moves to the rear limit position .

The third step is to disconnect the connection between the hook 16 and the handle 6, and the upper intermediate roll 8, the upper working roll 9, and the lower working roll 10 in the roll system are hoisted by the row crane from top to bottom, and the movable rail 12 of the upper track 4 is opened. , and then hang the lower intermediate roll 11 of the roller system by the row crane.

The fourth step is to hoist the lower intermediate roll 11, close the movable rail 12 of the upper rail 4, and then hoist the lower working roll 10, the upper working roll 9 and the upper intermediate roll 8.

In the fifth step, the cart 1 moves to the front limit position, the tractor 2 moves to the front limit position, and pushes the roll system into the rolling mill.

In actual use: firstly, the rolling mill is stopped, and the rolling pressure of the rolling mill on the roll system is released. At the same time, the nitrogen spring 3 relieves the pressure on the upper and lower ends of the roll system, and the nitrogen spring 3 supports and lifts the bearing housings at both ends of the rolls in the roll system. Move the lower work roll 10, the upper work roll 9 and the upper intermediate roll 8, so that the lower intermediate roll 11, the lower work roll 10, the upper work roll 9 and the upper intermediate roll 8 are supported by the nitrogen spring 3, and then start the cart 1 Make the cart move to the front limit position, the cart is docked with the roll changing port of the rolling mill, and then the tractor 2 moves to the front limit position in the direction of the rolling mill. When the tractor 2 moves, the guide surface 18 of the hook 16 contacts the handle 6, and the hook One end of 16 rotates upwards, then the tractor 2 continues to move, and the hook 16 moves accordingly. When the connecting groove 19 of the hook 16 moves to the top of the handle 6, the hook 16 rotates downward due to its own weight, so that the handle 6 is located in the connecting groove 19, then the tractor 2 is controlled to move to the rear limit position, the tractor 2 pulls the handle 6 through the traction hook 7, and the handle 6 drives the lower work roll 10. Due to the self-weight of the roll system, the lower middle roll 11, the upper work roll 9 and the upper work roll The intermediate roll 8 moves with the lower working roll 10. When moving, the pulleys on both sides of the lower intermediate roll 11 enter the lower track 5, and the pulleys on both sides of the lower working roll 10 enter the upper track 4, and then start the cart 1 to move away from the rolling mill. to the rear limit position, then hoist the upper intermediate roll 8, upper working roll 9, lower working roll 10 and lower intermediate roll 11 in sequence by crane or lifting equipment, and then lift the new roll system to the cart in reverse operation 1 on the upper track 4 and lower track 5, and then through the cart 1 and the tractor 2, the roll system is sent into the rolling mill, and the rolling mill presses the roll system, the nitrogen spring 3 is compressed, and the roll system contacts.

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and can also be made without departing from the gist of the present invention within the scope of knowledge possessed by those of ordinary skill in the art. Various changes are within the protection scope of this technology.

Claims (7)

1. A roll changing device, comprising at least cart (1), tractor (2) and roller system, is characterized in that: also comprises nitrogen gas spring (3), a pair of upper track (4), a pair of lower track (5) ), the handle (6) and the draw hook (7), the roll system includes the upper intermediate roll (8), the upper work roll (9), the lower work roll (10) and the lower intermediate roll (11), the upper Between the chocks of the intermediate roll (8) and the upper work roll (9), between the chocks of the upper work roll (9) and the lower work roll (10), and between the chocks of the lower work roll (10) and the lower intermediate roll (11) A pair of nitrogen gas springs (3) are arranged between them, and a tractor (2) is slid on the cart (1), and the moving direction of the tractor (2) and the cart (1) is perpendicular to the working line of the unit. The upper rail (4) and the lower rail (5) are fixed sequentially from top to bottom on the cart (1) and on both sides of the tractor (2), and the handle (6) is fixed on one end of the lower work roll (10). The tow hook (7) is detachably connected to one end of the tractor (2). 2. A roll changing device according to claim 1, characterized in that: the upper intermediate roll (8) is opposite to the bearing seat at both ends of the upper working roll (9), and the upper working roll (9) is connected to the lower working roll (9). A pair of grooves are formed on the opposite surfaces of the bearing housings at the two ends of the roll (10) and the bearing housings at the two ends of the lower work roll (10) and the lower intermediate roll (11). The upper intermediate roll (8) and the upper work roll ( 9) The groove on the opposite surface of the bearing seat, the groove on the opposite surface of the bearing seat of the upper work roll (9) and the lower work roll (10), and the groove on the opposite surface of the bearing seat of the lower work roll (10) and the lower intermediate roll (11) Nitrogen gas springs (3) are arranged in the grooves. 3. A roll changing device according to claim 2, characterized in that there is a gap of 2 mm between the nitrogen spring (3) and the inner wall of the groove. 4. A kind of roller changing device according to claim 1, characterized in that: said upper rail (4) is made up of two movable rails (12) and three fixed rails (13), and said three fixed rails ( 13) Movable rails (12) are arranged between adjacent ones, one end of the movable rails (12) is hinged to the fixed rail (13), and the other end of the movable rails (12) is in contact with the fixed rail (13). 5. A roll changing device according to claim 1, characterized in that: the traction hook (7) consists of a pair of brackets (14), a pair of rotating shafts (15), a pair of hooks (16) and a linkage rod (17) composition, described support (14) is relatively parallel fixed on tractor (2) one end, and one end of a pair of described hooks (16) is respectively hinged in a pair of supports (14) by rotating shaft (15), and a pair of The lower surface of the other end of the hook (16) has a guide surface (18) and a connecting groove (19), and a linkage rod (17) is fixed between the other ends of a pair of the hooks (16). 6. The roller changing device according to claim 1, characterized in that: the tractor (2) is located on the lower rail (5). 7. A roll changing method, characterized in that: comprising a roll changing device according to any one of claims 1-6, further comprising the following steps: The first step is to release the pressure of the rolling mill on the roll system, and the nitrogen spring (3) will push the rollers in the roll system by 10mm-30mm; In the second step, the hook (16) of the tractor (2) is connected with the handle (6), the tractor (2) moves to the rear limit position on the cart (1), and the roller system is dragged to the upper track (4) and On the lower track (5), the cart moves to the rear limit position; The third step is to disconnect the connection between the hook (16) and the handle (6), and the upper intermediate roll (8), the upper working roll (9), and the lower working roll ( 10), open the movable rail (12) of the upper track (4), and then take the lower intermediate roller (11) of the roller system by the row crane; The fourth step is to hoist the lower intermediate roll (11) by crane, close the movable rail (12) of the upper rail (4), and then hoist the lower working roll (10), upper working roll (9) and upper intermediate roll (8); In the fifth step, the cart (1) moves to the front limit position, and the tractor (2) moves to the front limit position to push the roll system into the rolling mill.