CN218532332U - Piston overhead type two-roller short stress path rolling mill loaded pressing adjusting device - Google Patents

Abstract

The utility model discloses piston overhead type two roller short stress path rolling mill area carries and pushes down adjusting device. The hydraulic bearing comprises an upper bearing seat, a lower bearing seat, a nut, a hydraulic cylinder and a hydraulic cylinder, wherein an accommodating stroke cavity is arranged in the upper bearing seat corresponding to the nut; the cylinder body of the hydraulic cylinder is arranged in the accommodating stroke cavity, and the piston of the hydraulic cylinder is fixedly connected with the nut; or the piston of the hydraulic cylinder is arranged in the containing stroke cavity, and the cylinder body of the hydraulic cylinder is fixedly connected with the nut. The utility model discloses based on traditional pull rod (screw rod), nut mechanism, roll gap adjustment mechanism, established ties and stacked in pull rod, nut mechanism and be used for from top to bottom axle 9633, bearing center-to-center distance fine setting driven pneumatic cylinder has constituted and can act on with one side upper and lower bearing frame, can be used in different process stages, and two sets can implement the mechanism of regulation respectively to upper and lower bearing frame center-to-center distance.

Description

Piston overhead type two-roller short stress path rolling mill loaded pressing adjusting device

Technical Field

The utility model relates to the technical field of a two-roller short stress path rolling mill for bar section rolling equipment, in particular to a piston overhead type two-roller short stress path rolling mill loaded pressing down adjusting device; the method is used for solving the problem of online dynamic adjustment of the rolling reduction in the rolling process of high-precision bar profile products.

Background

A two-roller short stress line rolling mill is commonly adopted in small-sized bar and section steel rolling workshops, has the characteristics of light equipment weight, simplicity in operation, rapidness in replacement, reliability in operation and the like, and becomes the leading type of the rolling mill which is most adopted in bar and small-sized steel production lines in the world at present.

A traditional two-roller short stress path rolling mill type is applied to a rolling mill line and is based on an equipment application scheme of off-line preparation, assembly among rollers and complete machine replacement. Due to the reasons of complex structure, long assembly time and the like, in order to improve the operation rate of the rolling line, the assembly and adjustment work is finished in a roller maintenance workshop, a plurality of rolling mills are backed up, and the mode of on-line rotation is adopted; when the rolling mill is in an application state on a rolling line, the relative position parameters of the rolls are adjusted under the condition that the rolling mill is not excessive in steel.

In recent years, in order to meet the requirements of adopting high-precision and high-value-added rod sectional material products in the manufacturing industry and the requirements of intelligentizing the rolling process, the section precision and the head-tail tolerance precision of the rod sectional material products are improved, and the requirement of the function of adjusting the on-line loaded reduction under the loaded condition of a two-roller short-stress-path rolling mill is provided. The rolling reduction is the adjustment of the center distance between the two rollers. The traditional two-roll short stress path rolling mill which is commonly used at present does not have the function condition of on-line load reduction adjustment, and the improvement of the rolling process condition is seriously restricted. The function of adjusting the online load reduction of the short stress path rolling mill is improved, and the key and common problems in the rolling process of high-precision rod-shaped products in the industry are solved.

The utility model discloses two mode draft adjusting device of two roller short stress path rolling mills have improved two roller short stress path rolling mill screw-down mechanism, satisfy two roller short stress path rolling mill rolls and take the year draft regulatory function condition on line, can realize rolling technology and equip effective matching, solve the long material product problem of high accuracy, satisfy the automatic demand of technology regulation simultaneously.

In the traditional two-roller short stress path rolling mill, two pull rods with positive and negative threads are adopted between bearing blocks at two ends of a transmission side and an operation side of an upper roller and a lower roller to be connected with nuts fixed in the bearing blocks, so that rolling force is borne under the mechanical condition of shortening stress paths; the pull rod is rotated to change the center distance between the upper roller and the lower roller, namely the roller gap of the rollers is adjusted, so as to meet the pass requirement of the rolling process.

The screw-down adjusting mechanism is used for adjusting the center distance between the upper roller and the lower roller; the device mainly comprises a pull rod mechanism, a roll gap adjusting and driving mechanism and the like which are used for connecting bearing blocks at two ends of the transmission side and the operation side of an upper roll and a lower roll of a rolling mill. The screw is provided with positive and negative threads, so that the screw is correspondingly fixed in the upper and lower bearing seats and is fixed in an axial position and a nut which cannot rotate in the circumferential direction; when the pull rod rotates, under the action of a kinematic pair formed by the positive and negative threads on the pull rod and the nut fixed in the bearing seat, symmetrical relative displacement occurs between the upper bearing seat and the lower bearing seat, and the adjustment of the center distance between the upper bearing seat and the lower bearing seat is realized.

The structure of a screw-down mechanism of a traditional two-roller short stress path rolling mill and the driving capability of a roll gap adjusting mechanism are designed to be statically adjusted; that is, the position adjustment between the upper and lower bearing blocks is performed under the condition that the rolling mill is not in a steel state and is not loaded. The roll gap adjustment operation of the roller under the non-load condition is carried out in the following stages: (1) pre-adjusting the center distance between the upper and lower bearing seats of the two-roll short stress path rolling mill in a maintenance and assembly room of the rolling mill; (2) after the two-roller short stress path rolling mill is arranged on line, the roll gap and the axial position between an upper roller and a lower roller are accurately adjusted under the condition that no rolled piece exists in the rolling mill; (3) and (4) finely adjusting the roll gap and the axial position between the upper and lower rolls according to the small sample after trial rolling. Thus, roll gap adjustment remains static, although the mill is on-line.

The meaning of online belt load adjustment of the screw-down mechanism of the two-roller short stress path rolling mill is that the size of a roll gap between an upper roller and a lower roller is adjusted in real time when the rolling mill passes through a steel bar piece so as to meet the requirements of controlling the shape and the size precision of a rolled piece passing through the rolling mill.

The adjustment of the rolling reduction under the condition of online loading has the characteristics of trace and instant control. Therefore, the function of adjusting the online loaded rolling reduction of the short-stress-path rolling mill requires that the rolling mill reduction mechanism has stronger trace and instant adjusting capacity. From the working characteristics of the screw-down mechanism of the traditional two-roller short-stress-path rolling mill, the strength of each component in a rolled piece force closed type transmission chain formed by a screw and a nut between an upper bearing seat and a lower bearing seat which directly bear the rolling force meets the requirement; the driving capability is statically adjusted to meet the requirement, and the driving capability is dynamically saved and is worth researching. From the mechanism characteristics of the two-roll short stress path rolling mill, the adjustment quantity required by the process under the online load is extremely small; the screw and nut act as end elements in the drive chain of the screw down mechanism, meaning that the relative angle of rotation between the screw and nut is minimal during adjustment of the wire. Therefore, the two-roller short stress path rolling mill realizes the function of adjusting the rolling reduction under the condition of online loading, and the key problem to be solved is the form and the working mode of a roll gap adjusting driving mechanism for generating relative displacement between an upper bearing seat and a lower bearing seat in a rolling mechanism of the two-roller short stress path rolling mill.

In order to realize that the two-roller short stress path rolling mill has the function of adjusting under the condition of online load, the driving capability of a roll gap adjusting driving mechanism is increased in the industry, so that the function of adjusting under the condition of online load is realized. The method is that under the condition of basically not changing the structural composition and the working principle in the pull rod mechanism, namely, the pull rod still doubles as a screw rod, the stress system between the pull rod and an upper bearing seat and a lower bearing seat is not changed, the structural relationship between the screw rod and a nut kinematic pair is not changed, the working principle of adjusting the center distance between the upper bearing seat and the lower bearing seat is still adopted, the rotation driving capability of the traditional roll gap adjusting mechanism is increased, namely the rotation driving torque to the screw rod is increased; the screw rod under the condition of belt load is rotated by means of strong driving torque so as to achieve the purpose of immediately adjusting the roll gap under the condition of belt load.

Because the traditional short stress path rolling mill screw-down mechanism is designed to work under the condition of a static adjusting mode; the mechanical transmission chain formed by the screw, the nut kinematic pair and the roll gap adjusting and driving mechanism is longer, and the screw and the nut kinematic pair are positioned at the tail end of the screw down mechanism transmission chain; meanwhile, the screw and nut transmission mechanism is limited in mechanical characteristics, has large system inertia, and is difficult to control the relative position precision when the screw and the nut rotate. In the process of carrying out instant adjustment of the rolling reduction under the condition that the rolling mill is over the steel belt load, a transient dynamic process of static friction and dynamic friction exists between the pull rod and the nut friction pair; because the dynamic and static friction coefficients of the screw and nut kinematic pair are greatly different, a large enough power source needs to be configured to meet the power input condition. The instant adjustment of the rolling reduction is a process that a power source is continuously started and stopped, a large amount of energy is consumed to adapt to the dynamic reaction of a transmission chain, and the adjustment reaction is seriously lagged. Therefore, the relative rotation between the screw and the nut is selected, the rotary driving torque of the screw is increased, an online load adjustment mode is realized, the dynamic characteristic is poor, and the optimal selection of the instant adjustment mechanism under load is not realized. Secondly, according to the size of the top space of the traditional two-roller short stress path rolling mill, under the condition that the center distance of a pull rod of a bearing seat of the rolling mill is not increased, the matching requirement of the installation size of a roll gap adjusting driving device and screws on two sides of the bearing seat is difficult to meet by increasing the capacity of a driving device of the roll gap adjusting mechanism; and the center distance of the pull rod of the bearing seat of the rolling mill is increased, and after the size of the whole rolling mill is coordinated, the weight of the whole rolling mill is rapidly increased, and meanwhile, the situation that the whole rolling mill is difficult to be matched with other equipment of a rolling line and is subjected to adaptive transformation is caused, so that the economy is poor.

Therefore, in the two-roller short stress path rolling mill, the upper bearing seat and the lower bearing seat of the screw-down adjusting mechanism are connected by a pull rod nut, so that the functional condition of on-line adjustment under the load of the screw-down amount is not provided.

SUMMERY OF THE UTILITY MODEL

To the problem the utility model provides a piston overhead type two roller short stress path rolling mill under load adjusting device.

In order to achieve the purpose, the utility model discloses a two-roller short stress line rolling mill with load pushes down adjusting device of putting on piston, two-roller short stress line rolling mill, including the frame at least, correspond two bolster bearing blocks of relative setting of upper roll both sides, correspond two lower bearing blocks of relative setting of lower roll both sides and install the pull rod composition on the frame, pull rod upper segment and hypomere have forward and reverse screw thread; nuts are arranged at the positions corresponding to the threads in the upper bearing seat and the lower bearing seat,

a roll gap adjusting mechanism is arranged at the top of the two-roll short stress path rolling mill body; the roll gap adjusting mechanism is in transmission connection with the pull rod and drives the pull rod to rotate forwards or reversely so as to synchronously adjust the distance between the upper bearing seat and the lower bearing seat;

an accommodating stroke cavity is arranged in the upper bearing seat corresponding to the nut, and a hydraulic cylinder is arranged in the accommodating stroke cavity; the cylinder body of the hydraulic cylinder is arranged in the containing stroke cavity, and the piston of the hydraulic cylinder is fixedly connected with the nut.

Furthermore, the accommodating stroke cavity is an annular cavity arranged corresponding to the nut, and the hydraulic cylinder is an annular hydraulic cylinder; the annular hydraulic cylinder is sleeved on the outer side of the pull rod and is located below the nut.

Further, the annular hydraulic cylinder is arranged in an inverted manner; wherein, the upper end of the nut is outwards integrally provided with an annular edge; the piston is arranged below the annular edge of the nut and fixedly connected through a bolt; the cylinder body is downwards abutted against the bottom of the annular cavity.

Furthermore, an upper cover is arranged at the opening part of the containing stroke cavity, and more than two upper stop rotating pins are arranged on the nut; the upper cover is provided with a through hole corresponding to the rotation stopping pin, and the rotation stopping pin is inserted into the through hole.

Further, three-section type composite rollers are arranged between the two upper bearing blocks and between the two lower bearing blocks; the three-section type composite roller comprises: the pull rod, the roller sleeved on the pull rod and the roller shafts arranged on two sides of the roller in a matching way;

and the pull rod is an elastic element and is used for locking the roller with the three-section structure. The head of the pull rod is of a threaded structure, the middle of the pull rod is of a polished rod structure, two sides of the middle of the pull rod are of cone frustum transition structures, and the tail of the pull rod is a big end round body for stopping and positioning.

A hydraulic nut is arranged corresponding to the head of the pull rod;

the roll shaft is provided with a hollow structure inside and comprises a journal structure which is integrally manufactured and matched with the multiple rows of rolling bearings and a truncated cone structure which is arranged on one side of the journal close to the roll; the hollow structure is used for the pull rod 30 to pass through;

the envelope line of the outline of the roller is of a cylindrical structure; the middle part of the inner profile of the roller is a cylindrical hole; two ends of the roller shaft are provided with taper hole structures matched with the truncated cone round tables of the roller shaft;

the pull rod works in an elastic deformation range, and the hydraulic nut piston generates elastic deformation in an extension stroke and then releases to lock the combined roller in a prestressed state.

The utility model is based on the traditional pull rod (screw rod), nut mechanism and roll gap adjusting mechanism, and hydraulic cylinders for fine adjustment driving of the center distance between the upper bearing seat and the lower bearing seat are serially superposed in the pull rod and nut mechanism, thereby forming the upper bearing seat and the lower bearing seat which can act on the same side, and two sets of mechanisms which can respectively adjust the center distance between the upper bearing seat and the lower bearing seat can be used in different process stages; the double-mode rolling mill has working conditions under double modes, and solves the problems of instant load reduction and adjustment of the two-roller short stress path rolling mill.

The dual-mode adjusting load screw-down mechanism of the two-roller short stress path rolling mill has the following characteristics:

(1) the dual-mode independent adjusting function of a screw rod and nut rotation transmission adjusting mode and a hydraulic cylinder linear driving adjusting mode; the two mechanisms can work independently; the working condition adaptation range is wide, and the adjustment mode is flexible;

(2) the hydraulic cylinder directly drives the small stroke adjusting function under the load pressure, the low time delay reaction is realized, and the dynamic characteristic is good;

(3) the whole machine of the two-roller short stress path rolling mill has small change, small volume and light weight; the economy is good;

(4) the rolling mill has similar external dimension with the traditional short stress path rolling mill with the same specification, has good substitution, and can be interchanged with the traditional short stress path rolling mill with the same specification on the same base; and replacing the rolling mill under different process requirements.

Drawings

FIG. 1 shows the main components of a two-roll short stress path rolling mill and the positional relationship among various mechanisms, components and parts.

FIG. 2 shows the main components of the pull rod mechanism and the positional relationship between the components and parts.

Fig. 3 is a drawbar configuration. L represents a left-handed threaded portion and R represents a right-handed threaded portion; g denotes a fixed part.

FIG. 4 shows the main components of the cylinder and the positional relationship between the components and parts.

Fig. 5 shows the main components of the upper nut component and the position relationship between each component and part.

Fig. 6 shows a structure of a cylinder block assembly in the annular cylinder hydraulic cylinder.

Fig. 7 shows the positional relationship of the upper nut assembly and the annular cylinder hydraulic cylinder in two stroke positions. Fig. 7A shows the positional relationship between the upper nut assembly and the annular cylinder hydraulic cylinder in a stroke position. Fig. 7B shows the positional relationship of the upper nut assembly and the annular cylinder hydraulic cylinder in another stroke position.

Fig. 8A shows the rotation of the pull rod, and the upper and lower bearing blocks are in a far position after being roughly adjusted symmetrically.

FIG. 8B shows the rotation of the pull rod, and the upper and lower bearing blocks are in the near position after being roughly adjusted symmetrically.

FIG. 8C shows the hydraulic drive, with the lower bearing housing fixed in position and the upper bearing housing fine tuned.

FIG. 9 shows the main components and the positional relationship between the components and parts of a conventional drawbar mechanism.

Fig. 10 is a schematic structural view of the novel two-roll short stress rolling mill.

Fig. 11 is a schematic cross-sectional view of a roll-to-roll short stress mill.

FIG. 12 is a schematic view of the roll system in a separated condition.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

The concept of operating conditions in dual mode is: the screw-down mechanism works under the conditions of no-load and on-line loading of the rolling mill. The meaning is as follows: (1) the rolling mill has no rolled piece, the upper and lower rollers do not form the no-load condition of the rolling condition, namely, the screw and the nut are relatively rotated by the adjusting pull rod rotating driving mechanism of the hydraulic motor or the motor roll gap as a power source, and the upper and lower bearing seats are symmetrically pre-adjusted by taking the rolling central line as the reference; and when the screw rod reaches the preset position, the screw rod rotation driving mechanism stops working. (2) The upper and lower rollers of the rolling mill have rolled pieces, and the hydraulic cylinders superposed in series on the pull rod work under the condition of on-line on-load rolling, and under the action of oil liquid in the hydraulic cylinders, the relative position of the piston and the cylinder body relatively fixed in the nut changes, so that the small-range adjustment and the micro-dynamic adjustment of the position of the upper bearing seat relative to the lower bearing seat of the rolling mill are realized.

As shown in the figure, the utility model discloses two roller short stress path rolling mill body is main 1 roll gap adjustment mechanism, 2 pull rod mechanism, 3 operation side bolster bearing housing, 4 operation side step, 5 top rollers, 6 transmission side bolster bearing housing, 7 transmission side step, 8 bottom rollers, 9 base constitutions of piece.

The double-mode rolling reduction adjusting device of the two-roller short stress path rolling mill mainly comprises a piece 1 roll gap adjusting mechanism and a piece 2 pull rod mechanism.

The roll gap adjusting mechanism is arranged at the top of the two-roll short stress path rolling mill and used for driving a pull rod in the pull rod mechanism to rotate. The roll gap adjusting mechanism is driven by an independent hydraulic motor 4 groups of worm and gear transmission mechanisms or gear transmission mechanisms which can be linked. The non-stage transmission part of the transmission mechanism is connected with a pull rod in the pull rod mechanism; when the hydraulic motor is driven, the pull rods in the 4 groups of pull rod mechanisms in the rolling mill can rotate simultaneously.

The pull rod mechanism is used for connecting the upper bearing seat and the lower bearing seat (the piece 3 and the piece 4) and executing the function of adjusting the center distance of the upper bearing seat and the lower bearing seat. The pull rod mechanism mainly comprises a pull rod of a piece 10, an upper cover component of a piece 11, a stop pin of a piece 12, an upper nut of a piece 13, a screw of a piece 14, a stop block of a piece 15, a piston component of a piece 16, a cylinder component of a piece 17, a frame of a piece 18, a lower nut of a piece 19 and the like. Wherein the piston assembly of the piece 16 and the cylinder assembly of the piece 17 form an annular cylinder hydraulic cylinder.

The upper part of a pull rod mechanism middle part 10 is provided with a key connecting structure connected with a non-stage transmission part in the roll gap adjusting mechanism; the middle part of the part is of a polished rod structure, penetrates through the 18 machine frame and is used for middle reference positioning when the bearing seat on the part 3 and the lower bearing seat on the part 4 move; two sections of thread structures with different turning directions are arranged at the upper part and the lower part and are respectively connected with the upper nut of the part 13 and the lower nut of the part 19 to form a thread kinematic pair.

In the pull rod mechanism, an upper cover component of a piece 10 is fixed on the top surface of a bearing seat on a piece 3; the top surface of the nut on the anti-rotation pin insert 13 of the member 12 is fixed and passes through the hole structure of the cover assembly of the member 10 to prevent the nut on the member 13 from rotating. The stop pin of the element 12 is fixed at one end and can move axially in a circular hole fitted to it at the other end.

In the pull rod mechanism, the section of a nut on a piece 13 is of a T-shaped structure, and an inner bore is provided with a threaded structure and is matched with a threaded structure on the upper part of a pull rod of a piece 10; the upper part of the T-shaped structure is provided with a unthreaded hole and a screw hole; the screw hole is used for carrying a part 14 screw connected with a piston of the hydraulic cylinder; the cylindrical surface at the lower part of the T-shaped structure is matched with the inner surface of the annular cylinder hydraulic cylinder.

In the pull rod mechanism, the nut on the part 13 is fixed in the bearing seat on the part 3, the stop block of the part 15 prevents circumferential rotation, the nut on the part 19 is fixed in the lower bearing seat of the part 4, and the circumferential tooth-shaped structure is matched with the stop block to prevent rotation. The upper nut of the piece 13 and the lower nut of the piece 19 have thread structures with different screwing directions; the upper and lower sections of the pull rod of the part 10 with different screw thread structures form screw thread kinematic pairs with the upper nut of the part 13 and the lower nut of the part 19 respectively; when the pull rod of the member 10 rotates, the upper nut of the member 13 and the lower nut of the member 19 are fixedly connected with the upper bearing seat of the member 3 and the lower bearing seat of the member 4 respectively, so that the upper bearing seat of the member 3 and the lower bearing seat of the member 4 move in opposite or opposite directions symmetrically by taking the frame of the member 18 as a center. The direction of movement of the bearing seats on element 3 and the direction of movement of the bearing seats on element 4 towards and away from each other is determined by the direction of rotation of the tie rod of element 10.

In the pull rod mechanism, an annular cylinder hydraulic cylinder mainly composed of a piece 16 piston assembly and a piece 17 cylinder body assembly is positioned in an upper pit structure of a bearing seat on a piece 3 by taking a piece 10 pull rod as the center; the piston assembly of member 16 is disposed upwardly. The annular cylinder hydraulic cylinder is in a plunger cylinder form, and the lower part of the cylinder body assembly of the member 17 is provided with an oil hole for injecting/discharging hydraulic oil in the cavity. The piston assembly of member 16 is extended and then returned against the resilient damping body between the upper and lower bearing blocks. The piston assembly of the part 16 of the annular cylinder hydraulic cylinder is fixedly connected with the upper part of the T-shaped structure of the nut on the part 13 through the part 14 and the screw, and the bottom of the cylinder body assembly of the part 17 of the annular cylinder hydraulic cylinder is contacted with the bottom of the pit structure on the upper part of the bearing seat on the part 3 so as to conduct the relative displacement between the piston and the cylinder body of the annular cylinder hydraulic cylinder and the axial force of the pull rod of the part 10. When the nut on the part 13 moves to a certain position on the pull rod of the part 10, the cavity of the cylinder body assembly of the part 17 in the annular hydraulic cylinder is filled with/drained of hydraulic oil, and the bearing seat on the part 3 can be driven to move in a small range relative to the lower bearing seat of the part 4. When the amount of hydraulic oil injected/discharged into/from the cavity of the cylinder assembly of the component 17 is small, the moving form of the bearing seat on the component 3 is represented as micro-motion. It can be seen from fig. 2 that when the piston of the annular cylinder hydraulic cylinder and the cylinder body are displaced relatively, the piston assembly of the part 16 is fixedly connected with the upper part of the nut T-shaped structure on the part 13 through the screw of the part 14, so that the piston assembly moves with the pull rod of the part 10, but because the stroke of the annular cylinder hydraulic cylinder is small, the top of the nut T-shaped structure on the part 13 does not interfere with the relevant position of the cover assembly on the part 11 in the maximum stroke state.

In the pull rod mechanism, a pull rod of a piece 10, an upper nut of a piece 13 and a lower nut of a piece 19 form a threaded motion pair, when the pull rod of the piece 10 rotates, the upper bearing seat of the piece 3 and the lower bearing seat of the piece 4 can be driven to move relatively without depending on the relative displacement of a piston and a cylinder body of a ring-shaped cylinder hydraulic cylinder, the ring-shaped cylinder hydraulic cylinder does not depend on the rotation of the pull rod of the piece 10, the upper bearing seat of the piece 3 can be driven to move relatively with the lower bearing seat of the piece 4 only by the relative displacement of the piston and the cylinder body, two sets of mechanisms for driving the upper bearing seat of the piece 3 and the lower bearing seat of the piece 4 to move relatively can act respectively, the relative change of the upper bearing seat of the piece 3 and the lower bearing seat of the piece 4 is realized, and the movement of the upper bearing seat of the piece 3 and the lower bearing seat of the piece 4 drives the upper and the change of the roll gap of the lower roll, so that the aim of adjusting the roll gap is fulfilled.

In the pull rod mechanism, a pull rod of a piece 10, an upper nut of a piece 13 and a lower nut of a piece 19 form a threaded kinematic pair, the transmission chain is long and dynamic and correspondingly slow, and the pull rod mechanism is used for roughly adjusting the roll gap of the roller under the condition of no load; the stroke of the annular hydraulic cylinder is small, and the formed roll gap adjusting mechanism is used for finely adjusting the roll gap of the roll. Because the annular cylinder hydraulic cylinder drives the piston component 16 and the cylinder component 17 to do relative motion in a mode of injecting/discharging hydraulic oil into/from the cavity of the cylinder component, the formed roll gap adjusting mechanism has short transmission chain and quick dynamic response, and is suitable for adjusting the online load reduction of a two-roll short-stress-path rolling mill.

4. Specific application of dual-mode press reduction adjusting mechanism

The invention is described in detail with reference to the accompanying drawings.

(1) As shown in FIG. 8A, after the two-roll short stress path rolling mill body is assembled in the rolling mill maintenance shop, the bearing seat on the part 3 and the lower bearing seat on the part 4 are in the farthest positions (for example, the roll gap distance is 58mm + 58mm). In the annular cylinder hydraulic cylinder, the bottom surface of the 16 piston assembly is spaced from the bottom surface of the 17 cylinder assembly, so that the bottom surface of the 16 piston assembly is not interfered with the bottom surface of the 17 cylinder assembly (for example, 5 mm).

(2) After the roll gap adjusting mechanism of the piece 1 is driven, the pull rod of the piece 10 rotates, under the side effect of thread motion formed by the upper nut of the piece 13 and the lower nut of the piece 19, the upper bearing seat of the piece 3 and the lower bearing seat of the piece 4 move symmetrically in opposite or deviating directions by taking the rack of the piece 18 as the center, and the distance is up to (for example, the roll gap distance is 46mm +46mm, and the distance between the bottom surface of the piston assembly and the bottom surface of the cylinder assembly is 5 mm);

(3) after the two-roller short stress path rolling mill body is moved to a rolling line preset position from a rolling mill maintenance workshop, if the distance between the upper bearing seat and the lower bearing seat after rough adjustment does not meet the requirement preliminarily, the roll gap adjusting mechanism of the starting part 1 is further adjusted on line so as to meet the roll gap requirement of the rolling process preliminarily;

(4) and carrying out trial rolling on the online strip. And starting a roll gap adjusting mechanism of the annular cylinder hydraulic cylinder to finely adjust the roll gap (for example, the distance between the roll gap is 46mm +46mm, and the distance between the bottom surface of the piston assembly and the bottom surface of the cylinder assembly is 8 mm).

As shown in fig. 10 to 12, the short-stress-path rolling mill body is mainly composed of a work-side bearing block assembly 600, an upper roll 25, a lower roll 26, a drive-side bearing block assembly 700, and the like.

The operating side bearing block assembly 600 mainly comprises a pull rod mechanism 2, an operating side upper bearing block 23, an operating side lower bearing block 24, a frame 9 and the like; the operation side upper rollers 31, 34, the operation side lower roller, the hydraulic nut 32, the lock nut 33, the upper roller cover 37, and the lower roller cover 38 are contained in the operation side upper bearing housing 23 and the operation side lower bearing housing 24.

The drive side bearing block assembly 700 is mainly composed of a drawbar mechanism 2, a drive side upper bearing block 26, a drive side lower bearing block 27, a frame 9 and the like. The drive side upper roller 35, the drive side lower roller 36, and the two sets of tie rods 30 are contained in the drive side upper bearing block 26 and the drive side lower bearing block 27.

The hydraulic nut 32 is used to stretch the tension rod 30 to meet the requirements of the roller system connection process in the assembling and disassembling processes. The hydraulic nut 32 is of a short-stroke high-pressure plunger cylinder type, and the working pressure is not lower than 65Mpa. The hydraulic nut 32 is mainly composed of a cylinder assembly 321, a piston assembly 322, and the like. The 321 cylinder body component is of an annular structure, the outer cylindrical surface is provided with threads to be matched with the locking locknut 33, the inner cylindrical surface is provided with threads to be matched with the pull rod 30, and the middle part is of a high-pressure plunger cylinder structure. The hydraulic nut 32 adopts a quick connector connection working mode; when the roller system is assembled and disassembled, the hydraulic nut 32 is connected with a hydraulic source through a quick joint.

The locking locknut 33 is used for preventing the roller system with the three-section structure from being loose after the 32 hydraulic nut is decompressed. The locking locknut 33 is of an annular structure, the outer ring is provided with a tool insertion hole for assisting the locking locknut to rotate, and the inner cylindrical surface is provided with threads matched with the hydraulic nut 32.

The pull rod 30 is an elastic element and is used for locking the roller with a three-section structure. The head of the pull rod 30 is in a threaded structure, the middle part is in a polished rod structure, two sides of the middle part are in a cone transition structure, and the tail part is a big head round body for stopping and positioning. The tension rod 30 works in the elastic deformation range, and the hydraulic nut 32 is utilized to elastically deform during the extension stroke of the piston, then release and lock the combined roller in a prestressed state.

The operation-side upper bearing housing 23, the operation-side lower bearing housing 24, the transmission-side upper bearing housing 26, and the transmission-side lower bearing housing 27 are respectively provided with operation-side upper rollers 31, 34, an operation-side lower roller shaft, a transmission-side upper roller shaft 35, and a transmission-side lower roller shaft 36 (hereinafter collectively referred to as roller shafts). The roll shaft is a component, and a sleeve barrel sleeve, a flange part and the like are arranged inside the roll shaft. Each structural section of the outer cylindrical surface of the roll shaft is respectively provided with a shaft neck structure and a truncated cone structure which are matched with a plurality of rows of rolling bearings, and a hollow structure is arranged inside the shaft neck structure and the truncated cone structure; the hollow structure is penetrated by the pull rod 30. The shape of the truncated cone circular truncated cone structure of the roll shaft is matched with the shapes and the sizes of the conical holes at the two ends of the upper roll 25 and the lower roll 28, so that the connection of the three-section type rolls is realized, the rolling torque is transmitted, and the bending moment generated when the rolls bear the rolling force is transmitted. A sealing ring groove is carved on the big end curved surface of the truncated cone round platform structure and used for placing a sealing ring to realize sealing between the roll shaft and the roll and prevent cooling water from invading during rolling. The hollow section of the operating-side roll shaft is provided with a set of sleeve elements for guiding and coarse centering of the head of the tie rod 30. The tail shaft head part of the transmission side roller shaft is of a flat head structure connected with a universal coupling of the rolling mill; a group of sleeves and flange pieces are arranged in the hollow structural section of the head part and are used for centering the pull rod 30 and preventing the pull rod from withdrawing from the tail part of the roller shaft at the transmission side. The rest parts of the roll shaft structure meet the structural requirements of corresponding bearing seat parts. The upper and lower rolls 25, 28 serve as consumables of the rolling process for directly carrying the rolled stock. The envelope lines of the outlines of the upper roller 25 and the lower roller 28 are cylindrical structures; the mechanical factory delivers that a plurality of groups of hole grooves are carved by a steel mill according to a steel rolling process. The middle parts of the inner outlines of the upper roller 25 and the lower roller 28 are cylindrical holes; two ends are in taper hole structures; the shape of the taper hole structure is matched with the shape and the size of a cone frustum at the head part of the upper roller shaft, and the rolling torque is transmitted.

The hydraulic nut 32, the locking locknut 33, the operating side upper bearing block 23, the operating side upper roller 31, the upper roller 25, the pull rod 30, the transmission side upper roller 35 and the transmission side upper bearing block 26 form a three-stage structure upper roller system. The hydraulic nut 32, the locking nut 33, the operation side lower chock 24, the operation side lower roller 34, the lower roller 28, the pull rod 30, the transmission side lower chock 27 and the transmission side lower roller 36 form a three-stage lower roller system.

The operation side roll shaft, the roller and the transmission side roll shaft are connected by a pull rod 30, a hydraulic nut 32 and a locking locknut 33 to form a three-section type roll system structure, and the pull rod 30 is a stress working unit in a prestress state and can bear bending moment generated by rolling force while transmitting rolling torque.

In the roll system, the operation-side upper roll shaft 31 is fixed in the operation-side upper bearing block 23, the transmission-side upper roll shaft 35 is fixed in the transmission-side upper bearing block 26, and the upper roll 25 is assembled between the two sections of roll shafts on the operation side and the transmission side;

the head of the pull rod 30 penetrates through a hollow structure at the tail of the transmission side upper roll 35, a cylinder with a large head at the tail of the pull rod is stopped at the end face of a flat head structure of the transmission side roll, the cylinder is centered by a group of sleeves and flange parts inside the transmission side upper roll 35 and is fixed in axial position, then, the head of the pull rod 30 sequentially penetrates through the upper roll 25 and the operation side upper roll 31, the head thread structure is exposed outside the bearing seat 23 on the operation side, the locking step is executed by the hydraulic nut 32, and the locking and anti-loosening nut 33 is used for preventing loosening, so that the connection of a three-section structure of a roll system is realized, and the high working reliability is realized.

Because the roller shaft and the roller adopt a shaftless structure connected by conical surfaces in the three-section structure of the roller system of the utility model, and the hollow structure adopts the pull rod 30 to lock, the roller can be centered in a self-adaptive mode, thereby reducing the difficulty of assembly and disassembly; the pull rod 30 is always fixed in the upper bearing seat 26 and the lower bearing seat 27 on the transmission side, and no interference obstacle exists in the whole assembly and disassembly process; when assembling, the roller is aligned to the cylinder. The characteristics of convenient cylinder and reliable connection provide convenient conditions for automatic assembly and online roll change of the rolling mill body.

In summary, in the roll system with the three-segment combined structure, in the operation-side chock assembly 600 and the transmission-side chock assembly 700, the roll shaft and the bearing of the chock are always connected and fixed in position with other parts of the chock in the processes of working, dismounting and assembling, and do not participate in replacement, so that the good assembling structure and performance are maintained. Because based on the two roller short stress path rolling mills of combined type roll, rational in infrastructure, reliable operation, dismantlement, the discrete spare of assembly are few for dismantle, the assembly is very simple, convenient, can shorten roll change time, possess online roll change condition. Secondly, because the replacement part only relates to the roller in the middle of the roller system, the weight influencing the economy is small, and therefore, secondly, because the consumption part is less, the economical efficiency is good.

Claims (2)

1. A kind of piston upper-mounted two-roller short stress path rolling mill carries the lower adjusting device, the said two-roller short stress path rolling mill, including the stander at least, correspond to two upper bearing blocks that the opposite arrangement of both sides of the upper roll, correspond to two lower bearing blocks that the opposite arrangement of both sides of the lower roll and install the tie rod on the stander to make up, said tie rod upper section and lower section have forward and reverse whorls; nuts are arranged at the positions corresponding to the threads in the upper bearing seat and the lower bearing seat,

a roll gap adjusting mechanism is arranged at the top of the two-roll short stress path rolling mill body; the roll gap adjusting mechanism is in transmission connection with the pull rod and drives the pull rod to rotate in the forward direction or the reverse direction so as to synchronously adjust the distance between the upper bearing seat and the lower bearing seat;

the hydraulic bearing is characterized in that a containing stroke cavity is arranged in the upper bearing seat corresponding to the nut, and a hydraulic cylinder is arranged in the containing stroke cavity; the cylinder body of the hydraulic cylinder is arranged in the containing stroke cavity, and the piston of the hydraulic cylinder is fixedly connected with the nut.

2. The strip load reduction adjusting device of the two-roll short-stress-path rolling mill with the overhead piston as claimed in claim 1, wherein the accommodating stroke cavity is an annular cavity corresponding to the nut, and the hydraulic cylinder is an annular hydraulic cylinder; the annular hydraulic cylinder is sleeved on the outer side of the pull rod and is located below the nut.

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