CN214813633U

CN214813633U - Driving device for guide plate of curling furnace of steckel mill

Info

Publication number: CN214813633U
Application number: CN202121793762.3U
Authority: CN
Inventors: 李志平; 刘伟德; 张绪平; 郇锋; 马航; 谢国峰; 郭燕喜; 韩澎
Original assignee: Shandong Taishan Steel Group
Current assignee: Shandong Taishan Steel Group
Priority date: 2021-08-03
Filing date: 2021-08-03
Publication date: 2021-11-23
Anticipated expiration: 2031-08-03

Abstract

The utility model discloses a driving device of a curling furnace guide plate of a steckel mill, which comprises an air cylinder, an upper guide plate and a lower guide plate, wherein the bottom of the air cylinder is arranged on the ground outside the curling furnace through a base; the driving device of the furnace rolling mill curling furnace guide plate designed by the utility model has reasonable design, is simple and practical, is convenient to install, disassemble and maintain, is far away from a heat source, prolongs the online service cycle of the cylinder, and solves the problems of slow air mixing action caused by burning loss of the seal, valve blockage and tube explosion caused by carbonization of the hose; the cylinder rod side seal is damaged due to the transmission of the mandrel, and the air leakage rise slowly; mechanical limit is added, so that the guide plate is always threaded at a reasonable position, the equipment utilization rate is improved, production is guaranteed, and the production efficiency is improved.

Description

Driving device for guide plate of curling furnace of steckel mill

Technical Field

The utility model relates to a steel rolling equipment technical field, concretely relates to steckel mill curls drive arrangement of stove baffle.

Background

The guide plate is used as a rolled piece guiding device when working and is used as a furnace door when not working. The quick start rolling can be realized, and the heat dissipation rate of the strip steel is reduced, so that the head and tail temperature of the strip steel is ensured, and the lifting speed of the guide plate plays an especially important role. Because of the design reason, the upper guide plate cylinder is arranged on two sides between the lower furnace shell and the cross beam of the coiling furnace, one cylinder is respectively arranged on the transmission side and the operation side, the gap between the cylinder body and the furnace shell is only about 20mm, the installation working space is narrow and small, and the position is relatively hidden. The air cylinder is baked at high temperature for a long time, the working temperature of the shell is more than 120 ℃, the inner part of the air cylinder is sealed and burnt, and the service life of the air cylinder is seriously reduced; meanwhile, the spot inspection and the replacement are difficult, each replacement needs more than 4/hour, and great passivity is brought to tissue maintenance.

At present, the lifting of the upper guide plate and the lower guide plate of the steckel mill coiling furnace of domestic steel rolling enterprises generally adopts the following two traction modes:

the steckel mill consists of a four-roll finishing mill and two coiling furnaces, wherein the coiling furnaces are divided into an upper part and a lower part, an upper cover can be hung away, the lower part is supported by a steel frame, the lower part is provided with an upper guide plate device and a lower guide plate device which correctly guide strip steel to enter a notch of a mandrel, the upper guide plate and the lower guide plate are respectively controlled by two cylinders to ascend and descend, and the contraction action of the cylinders is controlled by a three-position five-way reversing valve. The working medium is compressed air, so that the method has the advantages of low cost, simple design and installation and convenient use and maintenance. However, the volume of the cylinder is large, the action speed of the cylinder is not stable, and the rolling speed of a rolling line and the head and tail temperatures of rolled pieces are seriously influenced.

In another mode, the upper guide plate and the lower guide plate are respectively controlled by two oil cylinders to ascend and descend, and the contraction action of the oil cylinders is controlled by a servo valve. The working medium is hydraulic oil, the cost is high, the space occupied by the hydraulic cylinder is small, the design and installation are complex, and fire accidents are easy to occur due to leakage in a high-temperature area. But the action speed is stable, the speed adjustable range is wide, the lifting speed of the upper guide plate and the lower guide plate can be adjusted according to different rolling speeds, and the production requirement of a rolling line is met.

The existing domestic steel rolling enterprise steckel mill coiling furnace upper and lower guide plate lifting working mode, as shown in figure 1, steckel mill is composed of a four-roller reversible mill and two coiling furnaces, in which the upper and lower guide plate device is set for correctly guiding strip steel into the notch of winding drum 9. The upper guide plate 6 and the lower guide plate 8 are respectively controlled by an upper guide plate cylinder 10 and a lower guide plate cylinder 11 to ascend and descend. The guide plate device consists of a lower guide plate 8 close to the pinch roll and an upper guide plate 6 close to the winding drum 9, two sections of guide plates are respectively arranged on two cylinders on a transmission side and an operation side for traction, and the two sections of guide plates rotate around the same mandrel 7. The lower guide plate 8 is in a descending position and the upper guide plate 6 is in a horizontal position in the coiling and uncoiling processes. When the head of the steel plate is about to enter the coiling furnace for coiling after leaving the rolling mill, the upper guide plate 6 is at the ascending guide position, and when the head of the steel plate enters the notch of the winding drum and begins to coil, the upper guide plate 6 descends to the horizontal position. When the steel plate leaves the coiling furnace, the lower guide plate 8 rises to the horizontal position, and the upper guide plate 8 and the lower guide plate 8 are used as furnace doors at the moment, and the limit positions of the upper guide plate and the lower guide plate are controlled by a proximity switch. The action sequence is as follows: the lower guide plate 8 descends, the upper guide plate 6 ascends, the upper guide plate 6 descends and the lower guide plate 8 ascends.

Because the production rhythm is accelerated, the temperature in the curling furnace is not lower than 1150 ℃ in normal production, the guide plate mandrel can be extended along with the temperature rise (expansion with heat and contraction with cold) and the extension length is about 3-5mm, so that the flat head of the mandrel cylinder and the tail base of the cylinder are not on the same central line by the guide plate, and other forces appear. The phenomenon can cause the bending deformation of the piston rod of the cylinder, the chromium coating falls off, the surface of the piston rod becomes unsmooth, the rod side seal is damaged, and meanwhile, the piston on the plug side cannot move in parallel, and the cylinder wall is damaged. The cylinder mainly shows that the piston rod leaks air, the side of the cylinder plug is communicated with air, the ascending and descending speed of the cylinder is slow, the rolling rhythm is influenced, and the head and tail temperature of the steel strip is reduced.

The temperature around the cylinder can be increased by flame from the furnace in the coiling process, the highest temperature can reach 120 ℃, however, the design temperature of the cylinder can only bear about 80 ℃, and the sealing element is carbonized and hardened, is broken and loses the sealing effect when the cylinder works in the high-temperature environment. The air leakage at the piston rod position, the air leakage at the side of the air cylinder plug and the slow ascending and descending speed of the air cylinder are also shown, so that the system pressure is too low, and the normal production rhythm is influenced.

After the surface temperature of the cylinder reaches 120 ℃, the temperature of gas in the cylinder is about 110 ℃, the gas can be discharged through the exhaust port of the reversing valve through a pipeline, the reversing valve is bound to be damaged, a valve is clamped, the valve core cannot move, and production accidents are caused. Two cavities of each cylinder are connected by two 2SP-1600 hoses, if the temperature of a hearth is poorly controlled at a certain time, gas is not sufficiently combusted, a large amount of gas can carbonize the hoses in a short time, and pipe explosion is not easy to find during point inspection. Interrupting production. Therefore, the driving device of the guide plate of the curling furnace of the steckel mill is urgently needed to be designed so as to solve the problems that the service life of the existing cylinder close to a heat source is short, the lifting speed of the guide plate is reduced, the production is influenced and even the production accidents are caused.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model aims to provide a drive arrangement of steckel mill curling furnace baffle.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a drive arrangement of steckel mill curling furnace baffle, includes cylinder, upper baffle and lower baffle, the bottom of cylinder is passed through the pedestal mounting and is being ground outside the curling furnace, and the plug is installed on the jar pole top of cylinder, and the plug connection crank arm one end, the crank arm other end is connected on rotatory sharing dabber, and rotatory sharing dabber is connected upper baffle and lower baffle for the lift of guide and lower baffle is gone up in the lift drive of cylinder.

Specifically, the cylinder bottom is through round pin hub connection on the base, and the base welding is on the orbital base of roll change, and the lower surface that is less than roll change track support of base.

Specifically, the middle part of the plug is provided with a mounting groove, a crank arm is connected in the mounting groove through a pin shaft, the width of the mounting groove is 30mm larger than the thickness of the crank arm, and the distance from the central line of the pin shaft at the bottom of the cylinder to the central line of the pin shaft of the plug of the cylinder is 1186 mm.

Specifically, two joint bearings are mounted on the rotating shared mandrel, the joint bearings are mounted on a furnace frame of the curling furnace through two supports, a proximity switch is mounted at one end of the rotating shared mandrel, and the proximity switch is connected with computer software and used for transmitting position information of the upper guide plate and the lower guide plate to the computer software.

Specifically, the cylinder passes through cylinder support and round pin axle and installs on the base, and the cylinder support adopts length to be 140 mm's square steel welding on the base, and the installation angle of relative base is 30, and the cylinder body diameter of cylinder is 400mm, and the jar pole diameter of cylinder is 90 mm.

Specifically, the base is a steel plate with the thickness of 30 mm.

The utility model discloses following beneficial effect has:

the driving device of the furnace rolling mill curling furnace guide plate designed by the utility model has reasonable design, is simple and practical, is convenient to install, disassemble and maintain, is far away from a heat source, prolongs the online service cycle of the cylinder, and solves the problems of slow air mixing action caused by burning loss of the seal, valve blockage and tube explosion caused by carbonization of the hose; the cylinder rod side seal is damaged due to the transmission of the mandrel, and the air leakage rise slowly; mechanical limit is added, so that the guide plate is always threaded at a reasonable position, the equipment utilization rate is improved, production is guaranteed, and the production efficiency is improved.

Drawings

FIG. 1 is a schematic view of the operation of a leader board without modification.

Fig. 2 is a schematic view of the main structure of the present invention in the installed state.

In the figure: 1-a base; 2-a pin shaft; 3-a cylinder; 4-a plug; 5-crank arm; 6, an upper guide plate; 7-rotating the common mandrel; 8-a lower guide plate; 9-a winding drum; 10-upper guide plate cylinder; 11-lower guide plate cylinder; 12-lifting the upper guide plate; 13-descending the upper guide plate; 14-lifting the lower guide plate; and 15, descending the lower guide plate.

Detailed Description

The technical solution in the embodiments of the present invention will be described in further detail in the following clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in figure 2, the driving device of the guide plate of the curling furnace of the steckel mill comprises a cylinder 3, an upper guide plate 6 and a lower guide plate 8, wherein the bottom of the cylinder 3 is installed on the ground outside the curling furnace through a base 1, a plug 4 is installed at the top end of a cylinder rod of the cylinder 3, the plug 4 is connected with one end of a crank arm 5, the other end of the crank arm 5 is connected onto a rotating common mandrel 7, and the rotating common mandrel 7 is connected with the upper guide plate 6 and the lower guide plate 8 and is used for driving the upper guide plate 6 and the lower guide plate 8 to lift up and down through the lifting of the cylinder 3.

The bottom of the cylinder 3 is hung above a furnace shell of the curling furnace, the top of the cylinder 3 is connected with a crank arm 5 through a pin shaft 2, and an upside-down hanging and up-pulling type driving guide plate is adopted. The rotary shared mandrel 7 is fixed above the furnace frame of the curling furnace through two supports and rotates through a joint bearing. The lowering and lifting of the guide plate is achieved by the extension and retraction of the cylinder rod of the cylinder 3. The position of the guide plate is fed back to a computer system through a point signal through a proximity switch arranged on the rotary shared mandrel 7, and the guide plate position information is provided for an operator.

The furnace bottom roller way and the roller changing track are arranged below the curling furnace, the temperature is about one sixth of the original installation position temperature of the air cylinder, and therefore the installation mode of the air cylinder 3 is changed from an upward pulling mode to a downward pushing mode, and the installation mode can be absolutely changedMeets the existing production requirements. Clear away the concrete in roll change track department, expose steel bar structure installation cylinder base 1, highly must be less than roll change roll table support lower surface, can not influence the roll change roll table and shift out the immigration. The central line of the base 1 and the central line of the knuckle bearing connected with the crank arm 5 must be vertically coincided, the cylinder plug 4 is reprocessed, and the width of the middle of the plug 4 is increased by 30mm to be used as compensation quantity for the expansion caused by heat and contraction caused by cold of the mandrel. The distance between the central line of the top pin shaft of the cylinder 3 and the central line of the bottom pin shaft of the cylinder 3 is 1186 mm. In order to eliminate the asynchronous and forceful action delay caused by the actions of the cylinders at the two sides, one cylinder 3 is selected for driving during installation, and the diameter of the cylinder body of the cylinder 3 is determined by the diameter of the cylinder body

Is enlarged to

Diameter of cylinder rod of cylinder 3

Is enlarged to

The original operating speed of the cylinder 3 can be ensured. According to the pneumatic transmission principle formula: it is known that the speed and the traction force of the cylinder 3 can be increased even when the cross-sectional area of the cylinder rod is increased. And (4) removing the transmission side air cylinder, and only using the operation side air cylinder. The main basis of combining the cylinders into one is that one cylinder 3 can meet the lifting requirement of the guide plate under the condition that the cylinder 3 normally runs. The mounting method can effectively avoid the phenomenon that the working area of the cylinder burns out the seal due to overhigh temperature to influence the service cycle of the cylinder. The operation of the installation position area is wide. Convenient for point inspection, maintenance and replacement. Simultaneously, the problem of asynchronous movement of two sides caused by the installation position, the stroke and the abrasion clearance of the air cylinder is solved.

When the rotary shared mandrel 7 is heated and extends along the axial direction, the base 1 is not moved and is fixed for welding. The method for solving the problem can only increase the design size of the cylinder 3 support from 110mm to 140mm to be used as the position compensation when the cylinder 3 moves in series. The free movement of the crank arm 5 is achieved when the thermal expansion disappears. Thereby ensuring that the cylinder rod of the cylinder 3 is not damaged and playing a role of protecting the cylinder 3.

The pull-up type is changed into the push-down type, and the installation is shifted. The position size of the upper guide plate is measured on site, the base 1 is machined, the cylinder 3 is installed above the ground level in a shifting mode, and one steel plate (with the thickness of 30 mm) with enough strength is welded on the roll changing track of the furnace bottom roller way. It is installed on the upper part of the furnace bottom track to make full use of the track concrete foundation. In order to ensure the original working positions of the upper guide plate 6 and the lower guide plate 8 and the stress condition of the cylinder, the installation angle is determined to be 30 degrees through calculation, and the installation length of the cylinder 3 is ensured to be 1186 +/-10 mm. Thereby guaranteed upper guide 6, 8 original operating position of lower baffle, and cylinder 3 receives the impact force minimum this moment, and output torque is the biggest. Removing a dustproof ring of an end cover of a rod cavity of the cylinder; and the chamfers at the end parts of the buffering plungers at the two sides of the cylinder rod are enlarged to increase the stress area of the buffering plungers, so that the normal work of the cylinder 3 is ensured, and the buffering time of the cylinder 3 is reduced. The upper guide 6 is raised to the maximum position and the relative parallel position of the guide plane and the notch is actually measured, thereby determining the mounting position of the cylinder 3 and the absolute height of the mounting cylinder 3. The hose connected with the cylinder 3 is lengthened from 1600mm to 2300mm, so that the flexibility of the cylinder 3 and the angle following property during working are ensured. The effect is obvious after the field use, and the reaction speed of the cylinder 3 is the same as the original speed.

The utility model discloses not be limited to above-mentioned embodiment, anybody should learn the structural change who makes under the teaching of the utility model, all with the utility model discloses have the same or close technical scheme, all fall into the utility model discloses an within the protection scope.

The technology, shape and construction parts which are not described in detail in the present invention are all known technology.

Claims

1. The utility model provides a drive arrangement of steckel mill curling furnace baffle, its characterized in that includes cylinder, upper baffle and lower baffle, the bottom of cylinder is passed through the pedestal mounting and is being curled outside subaerial in the stove, and the plug is installed on the jar pole top of cylinder, and the one end of pin junction crank arm, the crank arm other end are connected on rotatory sharing dabber, and rotatory sharing dabber is connected upper baffle and lower baffle for the lift of lift drive upper baffle and lower baffle of cylinder.

2. The drive of the steekle mill curling furnace guide of claim 1, wherein said cylinder bottom is connected to a base by a pin, the base is welded to the base of the roll change track, and the base is lower than the lower surface of the roll change track support.

3. The driving device for the steekle mill curling furnace guide plate according to claim 2, wherein the plug is provided with a mounting groove in the middle, the mounting groove is connected with the crank arm through a pin shaft, the width of the mounting groove is 30mm larger than the thickness of the crank arm, and the distance from the center line of the pin shaft at the bottom of the cylinder to the center line of the pin shaft of the plug of the cylinder is 1186 mm.

4. The driving device for the guide plate of the curling furnace of the steckel mill as claimed in claim 1, wherein the rotating common mandrel is provided with two knuckle bearings, the knuckle bearings are arranged on a furnace frame of the curling furnace through two supports, one end of the rotating common mandrel is provided with a proximity switch, and the proximity switch is connected with computer software and used for transmitting the position information of the upper guide plate and the lower guide plate to the computer software.

5. The driving device of the steekle mill curling furnace guide plate of claim 1, wherein the cylinder is mounted on the base through a cylinder support and a pin shaft, the cylinder support is welded on the base by using square steel with the length of 140mm, the mounting angle relative to the base is 30 degrees, the cylinder body diameter of the cylinder is 400mm, and the cylinder rod diameter of the cylinder is 90 mm.

6. The drive of the steckel mill curl furnace guide of claim 1, wherein the base is a 30mm thick steel plate.