CN102581011A - Two roller upright rolling mill - Google Patents

Abstract

The invention relates to a two roller upright rolling mill, which comprises a rolling mill base, a rolling mill rack, two upright mill rollers (3, 2) and a mill roller clearance regulating mechanism, wherein the two upright mill rollers (3, 2) are arranged inside the rolling mill rack in parallel; the rolling mill base (5) comprises an upright end plate (5-1) and horizontal transverse beams (5-2) which are connected with four angles of the upright end plate (5-1) respectively; the horizontal transverse beams (5-2) are vertical to the upright end plate and extend towards the same direction; the rolling mill base is a floating type rack (11) which is embedded among the four horizontal transverse beams of the rolling mill base; the mill roller clearance regulating mechanism is arranged at the transmission side or the operation side of the rolling mill; and a roller gap centering mechanism is also arranged at the same side with the mill roller clearance regulating mechanism. While the two mill rollers are subjected to clearance regulation, the roller gap between the two mill rollers is centered automatically; the device is simple and convenient to operate and maintain; and the rollers can be exchanged conveniently and rapidly.

Description

Two roller vertical mills

Technical field

The present invention relates to duo mill, the two roller vertical mills that particularly can be rolled rectangle steel, tubing, bar and section bar.

Background technology

Two roller vertical mills comprise: rolling mill base be fixed on the rolling-mill housing on the rolling mill base, be installed in two setting rolls and roll balance mechanisms that are arranged in parallel in the rolling-mill housing and be installed in the roll seam guiding mechanism on the rolling-mill housing.Wherein: rolling mill base is installed on the ground; Rolling-mill housing is a cuboid with cavity, on four rectangular walls of cavity cuboid, has window, forms the hollow frame of a cuboid; Two setting rolls respectively through roll chock with respect in the vertical cavity that is installed in rolling-mill housing abreast of rolling centerline F-F (referring to Fig. 8), roll chock can carry out horizontal displacement on rolling-mill housing window inwall regulates.When rolling, rolled piece passes two roll gap between the roll from the input side charging of rolling-mill housing, and it is rolling by the body of roll of two rolls rolled piece to be carried out transverse horizontal, and the rolled piece after rolling is by the outlet side output of rolling-mill housing.For guaranteeing that roll chock moves horizontally effect on rolling-mill housing window inwall, the face that matches at roll chock and rolling-mill housing window inwall is provided with blade fin.Roll balance mechanism is mounted in the elastic equilibrium parts between the bearing block of two rolls; The pretension counter-force that elastic compression amount through the elastic equilibrium parts is had; Eliminate the gap between roll and bearing block and bearing block and the roll seam guiding mechanism, the impact of breaker roll when reducing rolled piece and nipping.The roll seam guiding mechanism is two; Be used to adjust two roll seams; Be installed in respectively on the end plate of transmission side and fore side of rolling-mill housing, be made up of hydraulic servo cylinder or electric-motor drive screw-nut body, this two covers roll seam guiding mechanism carries out moving relative to equidistant to the bearing block of transmission side roll, the bearing block of fore side roll respectively; Realize the adjustment of two roll seams, and keep the roll gap center of two rolls constant.

In addition; In order to be implemented in two synchronous relatively equidistant displacements of roll in the adjustment process; Between above-mentioned two roll seam guiding mechanisms, synchronous interlocking mechanism is set, that is: above-mentioned two hydraulic servo cylinders are provided with displacement transducer or two motor, reductors are connected through clutch, synchronizing shaft.Before rolling, the displacement transducer of hydraulic servo cylinder sends signal or clutch separation, and two roll seam guiding mechanism difference single movements are regulated the initial position of roll separately, and the roll gap center of two rolls is set on the rolling centerline; Subsequently, the displacement transducer of two hydraulic servo cylinders receives signal or clutch, and two roll seam guiding mechanisms are online to carry out synchronously two rolls of displacement equidistantly through synchronizing shaft with respect to rolling centerline.

The structure weak point of above-mentioned milling train is:

Said roll seam guiding mechanism is for moving two rolls respectively; Two rolls move through displacement transducer or clutch, synchronizing shaft carries out synchronous interlocking; When relative displacement reduces or increases two roll seams; Synchronously equidistant the moving of two rolls regulated control, the structure more complicated, cost is high;

The roll seam guiding mechanism that is positioned on the milling train fore side end plate makes troubles for rolling operation and overhaul of the equipments with its attached pipeline.

Existing milling train consider change two erect rolls convenience, usually the transmission mechanism of roll is arranged on the below of rolling-mill housing, during roll change, two rolls just can hang out from the top of rolling-mill housing or hang in like this.But; Because the roll transmission mechanism is positioned at the below of rolling-mill housing, during the motor of its transmission mechanism and accessory cables pipeline etc. all is in the immersion of band iron scale and rolling cooling water and washes away, even because of iron scale in the accumulation on every side of its milling train; The work under bad environment of rolling-mill housing bottom; Repair and maintenance is inconvenient, causes production operational availability to reduce, and maintenance cost increases.

Summary of the invention

Technical problem to be solved by this invention provides a kind of when carrying out the adjustment of two roll seams, can also make two roller vertical mills of the roll gap automatic centering of two rolls, and equipment is simple, is convenient to operation and maintenance.

The present invention's two roller vertical mills comprise rolling mill base, rolling-mill housing and are installed in two setting rolls that are arranged in parallel and the roll seam guiding mechanism in the rolling-mill housing.Wherein: said rolling mill base comprise erect end plate with respectively with four horizontal girds that the angle is connected erectting end plate, this horizontal gird is perpendicular to the setting end plate and to same direction extension; Said rolling-mill housing is floating type frame, is embedded in four horizontal girds of rolling mill base; Said roll seam guiding mechanism is installed in the transmission side or the fore side of milling train, also is provided with the roll gap centering body in the same side with roll seam guiding mechanism.

The present invention's two roller vertical mills, wherein: when said roll seam guiding mechanism and roll gap centering body were arranged on transmission side, the fore side roll chock was arranged on floating type frame on the inwall of the end plate of fore side; When said roll seam guiding mechanism and roll gap centering body were arranged on fore side, the transmission side roll chock was arranged on floating type frame on the inwall of the end plate of transmission side.

The present invention's two roller vertical mills; Wherein: said roll gap centering body comprises setting end plate or the movable top cover on the horizontal gird end that is arranged on said rolling mill base and is installed in the fluid pressure type transmission mechanism that has displacement transducer on this top cover, or has the mechanical type transmission mechanism of encoder;

Said roll seam guiding mechanism has the fluid pressure type transmission mechanism of the displacement transducer that is connected with floating type frame or has the mechanical type transmission mechanism of encoder.

The present invention's two roller vertical mills; Wherein: the fluid pressure type transmission mechanism of said roll seam adjustment; Comprise: one or two hydraulic cylinder for reduction system, this hydraulic cylinder for reduction system are installed on the end plate of said floating type frame, and the end face of its piston rod and corresponding roll chock lean.

The present invention's two roller vertical mills; Wherein: the mechanical type transmission mechanism of said roll gap gap adjustment is that a cover or two covers are depressed worm-and-wheel gear; Every cover is depressed worm-and-wheel gear and is comprised: be arranged on a screw box on the said floating type frame end plate and the depress spiro rod that is threaded with screw box; One end of said depress spiro rod leans on corresponding roll chock, and the other end is equipped with through connecting key and depresses worm gear, and this is depressed worm gear and depresses worm engaging; Depress worm gear, depress worm screw and bearing is installed in the reduction case together, reduction case is fixedly connected with floating type frame end plate; Saidly depress worm gear and connecting key is fastenedly connected, the keyway of connecting key and depress spiro rod is slidingly matched.When being two covers when depressing worm-and-wheel gear, in the two cover mechanisms one depress worm screw through shaft coupling with depress motor and be connected, depress for two and be provided with clutch between the worm screw.

The present invention's two roller vertical mills, wherein: the fluid pressure type transmission mechanism of said roll gap centering comprises one or two centering hydraulic cylinder that is installed on the said top cover.The shift motion of said centering hydraulic cylinder is 1/2 of a hydraulic cylinder for reduction system shift motion, and the moving direction of said centering hydraulic cylinder is opposite with the moving direction of said hydraulic cylinder for reduction system.When being a centering hydraulic cylinder, piston rod passes top cover and is connected in series with the cylinder body of said hydraulic cylinder for reduction system through Connection Block, or piston rod passes top cover and is connected with said floating type frame end plate; When being two centering hydraulic cylinders, piston rod passes top cover and is connected with floating type frame end plate.

The present invention's two roller vertical mills; Wherein: the mechanical type transmission mechanism of said roll gap centering is a cover or two cover centering worm-and-wheel gears, and every cover centering worm-and-wheel gear comprises: be arranged on centering nut and the centering screw rod that is connected with the centering nut thread on the said top cover.On the said centering nut centering worm gear is installed, centering worm gear and centering worm engaging, the shift motion of said centering screw rod is 1/2 of a depress spiro rod shift motion, the moving direction of said centering screw rod is opposite with the depress spiro rod moving direction.When being a cover centering worm-and-wheel gear, the centering screw rod passes top cover and is connected in series with said reduction case through Connection Block, or the centering screw rod passes top cover and is connected with said floating type frame end plate; When being two cover centering worm-and-wheel gears, two centering screw rods pass top cover respectively and are connected with said floating type frame end plate, and two centering worm screws are connected through clutch.

The present invention's two roller vertical mills, wherein: a side of said centering worm gear has annular boss, has the cannelure that matches with the annular boss of centering worm gear on the said top cover, and the wheel rim place that is positioned at the centering worm gear on the said top cover is provided with the worm gear pressing plate.

The present invention's two roller vertical mills; Wherein: the mechanical type transmission mechanism of said roll seam adjustment is that a cover or two covers are depressed the centering worm-and-wheel gear; Every cover is depressed the centering worm-and-wheel gear and is comprised: be arranged on the screw box in the said floating type frame end plate and be threaded with screw box depress the centering screw rod; This end of depressing the centering screw rod leans on corresponding roll chock, and the other end is equipped with through connecting key and depresses worm gear, and this depresses worm gear and the worm engaging of depressing with encoder; Depress worm gear, depress worm screw and bearing is installed in the reduction case together; Reduction case is fixedly connected with floating type frame end plate, saidly depresses worm gear and connecting key is fastenedly connected, and connecting key is slidingly matched with the keyway of depressing the centering screw rod.When being that two covers are when depressing the centering worm-and-wheel gear; Two depress in the worm screw one through shaft coupling with depress motor and be connected; Depress for two and be provided with clutch between the worm screw; Or two depressed worm screw and be connected with separately the motor of depressing through shaft coupling respectively, depresses for two and be provided with clutch between the worm screw.

The present invention's two roller vertical mills; Wherein: the mechanical type transmission mechanism of said roll gap centering; Comprise the centering nut that is arranged on the said top cover; This centering nut is connected with the centering screw flight of depressing of the mechanical type transmission mechanism of roll seam adjustment; The said pitch of depressing centering screw rod and centering nut thread is to depress 1/2 of pitch between centering screw rod and the screw box, and the said centering screw rod of depressing is identical with the rotation direction of depressing centering screw rod and centering nut thread with the rotation direction of screw box screw thread.

The present invention's two roller vertical mills, wherein: the initial adjustment worm gear is installed on said centering nut, initial adjustment worm gear and initial adjustment worm engaging, the initial adjustment worm screw is connected with the initial adjustment motor through shaft coupling.

The present invention's two roller vertical mills, wherein: a side of said initial adjustment worm gear has annular boss, has the cannelure that matches with the annular boss of initial adjustment worm gear on the said top cover, and the wheel rim place that is positioned at the initial adjustment worm gear on the said top cover is provided with the worm gear pressing plate.

The present invention's two roller vertical mills; Wherein: said floating type frame is a split-type, comprise its cross sectional shape be the unsealed rectangle of a side the frame body, be positioned at the housing cap and the retaining mechanism that is used to be connected frame body and housing cap of the not sealing part of frame body;

Have window on the two relative risers of said frame body, the frame body not the inner face of sealing end two risers have the keyway equipped respectively with housing cap rectangle contiguous block keyway, its outside has the male half coupling that cooperates with housing cap;

Said housing cap has the rectangle contiguous block that connects end plate, match with the internal orifice of frame body and the inner stopper equipped mutually with the male half coupling of frame body, has the keyway that is equipped with frame body two riser keyways on the relative two sides of said rectangle contiguous block.

The present invention's two roller vertical mills, wherein: the keyway shape of said frame body is the right angled triangle keyway, the keyway shape of said housing cap is the special-shaped keyway of a right angled triangle and " T " font combination;

The keyway of perhaps said frame body is divided into three sections at length direction, and the shape of two ends section is identical, is the right angled triangle keyway, and the keyway of its interlude is a holding tank.

The present invention's two roller vertical mills, wherein: said retaining mechanism comprises: be installed in feather key in the keyway of housing cap and frame body, control the hydraulic cylinder of this feather key displacement and be installed in the hydraulic cylinder that compresses in the housing cap outside;

The said piston rod that compresses hydraulic cylinder passes housing cap and connects end plate, is resisted against the end of frame body; The hydraulic cylinder seat of said displacement hydraulic cylinder is installed on the upper surface of said housing cap rectangle contiguous block, and its piston rod is connected with the upper end of feather key.

The present invention's two roller vertical mills, wherein: said feather key comprises the joint of cuboid and the guide head of connected " T " font;

Perhaps said feather key is divided into three sections at length direction, and the shape of two ends section is identical, comprises the joint of cuboid and the guide head of connected " T " font, the joint of its interlude be shaped as right angled triangle, guide head is " T " font; The length of two ends section is all less than 1/3 of feather key total length.

Two roller vertical mills of the present invention have the following advantages and effect.

1, owing to the rolling-mill housing regularly of traditional milling train is designed to the floating type frame that can be in rolling mill base moves horizontally with respect to milling train transmission side or fore side; A roll seam guiding mechanism only is installed on the floating type frame, and this roll seam guiding mechanism can move transmission side roll chock or the fore side roll chock in the floating type frame; Set up the roll gap centering body that is positioned on the rolling mill base simultaneously, this roll gap centering body can move floating type frame, and floating type frame and the transmission side roll, the fore side roll that are arranged in the floating type frame are moved together; That is: through roll seam guiding mechanism and roll gap centering body, when carrying out the adjustment of two roll seams, accomplish the automatic centering of two roller gaps and regulate, keep the roll gap center of two rolls constant.

2,, thereby saved investment because the roll gap centering body has replaced in the prior art synchronous interlocking mechanism between in two roll seam guiding mechanisms and two the roll travel mechanisms.

Because roll seam guiding mechanism and roll gap automatic centering mechanism design in the same side, generally are positioned at the transmission side of line of rolling apparatus, thereby have made things convenient for rolling operation.

3, owing to the shaped design with rolling mill base is the hollow frame with four crossbeams towards the fore side opening of milling train; When changing roll; Can earlier two roll integral body in floating type frame and the floating type frame be shifted out or move into from rolling mill base opening part level together, again two rolls are hung out or hang in from floating type frame top, thereby the roll transmission mechanism of two roller vertical mills of the present invention can design above milling train; Good work environment such as its motor and cable pipeline; Easy access is safeguarded, has improved operating rate, has reduced production cost and maintenance cost.

4, because the roll seam guiding mechanism is designed to be installed in fluid pressure type transmission mechanism or motor on the floating type frame through the mechanical type transmission mechanism of reductor; The roll gap centering body be designed to be installed on the rolling mill base movable top cover be installed in fluid pressure type transmission mechanism or motor on the top cover through the mechanical type transmission mechanism of reductor; Wherein: the displacement transducer breaker roll clearance adjustment mechanism of the servo hydraulic cylinder of fluid pressure type transmission mechanism and centering hydraulic cylinder and roll gap centering body carry out electric interlock control; Perhaps the encoder breaker roll clearance adjustment mechanism of depressing worm-and-wheel gear and centering worm-and-wheel gear of mechanical type transmission mechanism and roll gap centering body carry out electric interlock control; Roll seam guiding mechanism and roll gap centering body are moved simultaneously; The actual shift motion of roll gap centering body is 1/2 of a roll seam guiding mechanism shift motion; And in the opposite direction, realize the gap adjustment and the roll gap automatic centering of two rolls.

5, because the roll seam adjustment and the roll gap centering of mechanical type transmission are carried out Combination Design, that is: will depress shared one of worm-and-wheel gear and centering worm-and-wheel gear and depress the centering screw rod, this depresses the centering screw rod both by means of the screw box that is arranged in the floating type frame; Move a roll in floating type frame and two rolls; Again by means of the centering nut that is arranged in the top cover, integrally move floating type frame and two rolls simultaneously, the pitch of centering nut is 1/2 of screw box pitch; And its thread rotary orientation is identical; Realize adjustment of two roll seams and roll gap automatic centering, designs simplification, easy to operate.

6, because floating type frame is to bear the rolling load that transmits through roll chock; And be internal force; The centering hydraulic cylinder of roll gap centering body or the worm gearing of electric-motor drive mainly bear the frictional force that the weight of floating type frame and parts such as two rolls and bearing block thereof produces; The load of roll gap centering body is compared with the draught pressure between two rolls and is wanted much little when rolling, thereby the roll gap centering body is lighter than the weight of equipment of roll roller clearance adjustment mechanism, and cost is low.

7, when hot finished steel pipe; Because of the bending meeting of the even plug of pipe wall unevenness produces additional radial load to a roll in two rolls, because the roll gap centering body is designed to the fluid pressure type transmission, the present invention's two roller vertical mills with centering hydraulic cylinder are being applied to put down/during hot finished steel pipe milling train that the grade separation fork is arranged; Can be through the oil pressure of control centering hydraulic cylinder; Above-mentioned additional radial pressure is controlled in the smaller scope, reduces the bending stress of plug, the service life of having improved plug.

8, because floating type frame is designed to detachable, be made up of frame body with riser and the housing cap with rectangle contiguous block, the rectangle contiguous block is realized being connected or throwing off with riser through the feather key of retaining mechanism.When changing roll, can earlier housing cap and frame body be thrown off, again housing cap and two rolls are shifted out from the opening part level of milling train together, directly carry out roller replacing operation, easy to operate.

9, the combining structure pattern that is designed to have syllogic owing to feather key and keyway with retaining mechanism, during the dismounting housing cap, the actual shift motion of the feather key of retaining mechanism just is slightly larger than the length of two ends paragraph key groove.When the dismounting housing cap; Feather key must not thrown off moving of full stroke for making housing cap and frame body; Both shortened the shift motion of the hydraulic cylinder piston rod of retaining mechanism; Reduced the height of the hydraulic cylinder cylinder seat of retaining mechanism, reduced roller replacing operation again or handled attaching the time of helping of stifled steel accident, and made roller replacing operation convenient, quick.

10, when hot finished steel pipe; Because of the bending meeting of the even plug of pipe wall unevenness produces additional radial load to a roll in two rolls; Because the roll gap centering body is designed to the fluid pressure type transmission; The present invention's two roller vertical mills with centering hydraulic cylinder are being applied to put down/and during hot finished steel pipe milling train that the grade separation fork is arranged, can above-mentioned additional radial pressure be controlled in the smaller scope through the oil pressure of control centering hydraulic cylinder; Reduce the bending stress of plug, the service life of having improved plug.

In a word, have the present invention's two roller vertical mills of floating type frame, when carrying out the adjustment of two roll seams, accomplish the automatic centering of two roller gaps through roll seam adjustment and roll gap centering body.Equipment is simple, and rolling quality is high, and maintenance is convenient.Can be used in continuous rolling rectangle steel, tubing, bar and section bar.

Description of drawings

Fig. 1-the 1st, the structural representation of two roller vertical mills according to the invention;

Fig. 1-2 is the side view of Fig. 1-1;

Fig. 1-the 3rd, C-C cutaway view among Fig. 1-1;

Fig. 2-the 1st, the transmission side that the roller gap adjustment of milling train shown in Figure 1 and roll gap centering body are positioned at milling train, top cover is arranged on the madial wall of rolling mill base transmission side, has the structural representation of a servo hydraulic cylinder and two centering hydraulic cylinders;

Fig. 2-the 2nd, D-D cutaway view among Fig. 2-1;

Fig. 2-the 3rd, the floating type frame of 2-1 shifts out the rolling mill base view;

Fig. 3-the 1st, the fore side that the roll seam adjustment of milling train shown in Figure 1 and roll gap centering body are positioned at milling train, structural representation with price of a servo hydraulic cylinder and two centering hydraulic cylinders;

Fig. 3-the 2nd, the floating type frame of Fig. 3-1 shifts out or moves into the rolling mill base view;

Fig. 4 is the roll seam adjustment of milling train shown in Figure 1 and the transmission side that the roll gap centering body is positioned at milling train, and top cover is arranged on the lateral wall of rolling mill base transmission survey, has the structural representation of a servo hydraulic cylinder and a centering hydraulic cylinder that is connected in series with it;

Fig. 5 is the roll seam adjustment of milling train shown in Figure 1 and the transmission side that the roll gap centering body is positioned at milling train, and top cover is arranged on the lateral wall of rolling mill base transmission survey, has the structural representation of two servo hydraulic cylinders and a centering hydraulic cylinder;

Fig. 6 is the roll seam adjustment of milling train shown in Figure 1 and the transmission side that the roll gap centering body is positioned at milling train; Top cover is arranged on the lateral wall of rolling mill base transmission survey, has a cover and depresses the structural representation that worm-and-wheel gear and overlaps the centering worm-and-wheel gear that is connected in series with it;

Fig. 7 is the roll seam adjustment of milling train shown in Figure 1 and the transmission side that the roll gap centering body is positioned at milling train, and top cover is arranged on the lateral wall of rolling mill base transmission survey, has the structural representation that two covers are depressed a worm-and-wheel gear and a cover centering worm-and-wheel gear;

Fig. 8 is the roll seam adjustment of milling train shown in Figure 1 and the transmission side that the roll gap centering body is positioned at milling train, and top cover is arranged on the lateral wall of rolling mill base transmission survey, has the structural representation that a cover is depressed worm-and-wheel gear and two cover centering worm-and-wheel gears;

Fig. 9 is the two roller vertical mill structural representations of the present invention of milling train shown in Figure 1; Wherein demonstrate the transmission side that roll seam adjustment and roll gap centering body are positioned at milling train; Top cover is arranged on the lateral wall of rolling mill base transmission survey, has the structural representation that a cover is depressed the centering worm-and-wheel gear;

Figure 10 is the D-D section partial enlarged drawing of Fig. 9;

Figure 11 is the roll seam adjustment of milling train shown in Figure 1 and the transmission side that the roll gap centering body is positioned at milling train; Top cover is arranged on the lateral wall of rolling mill base transmission survey; Have two covers and depress the centering worm-and-wheel gear, two covers are depressed the centering worm-and-wheel gear and are had a structural representation of depressing motor;

Figure 12 is the roll seam adjustment of milling train shown in Figure 1 and the transmission side that the roll gap centering body is positioned at milling train; Top cover is arranged on the lateral wall of rolling mill base transmission survey; Have two covers and depress the centering worm-and-wheel gear, two covers are depressed the centering worm-and-wheel gear and are had two structural representations of depressing motor.

Figure 13 is the roll seam adjustment of milling train shown in Figure 1 and the transmission side that the roll gap centering body is positioned at milling train; Top cover is arranged on the lateral wall of rolling mill base transmission side; Have a servo hydraulic cylinder and two centering hydraulic cylinders, floating type frame is a split-type, the decomposing state figure when feather key shifts out;

Figure 14 is the O-O section plan view of Figure 13, and wherein demonstrating floating type frame is split-type, and feather key is a syllogic, is positioned at the connection status of feather key interlude when the next after feather key is installed;

Figure 15 is an A-A partial sectional view among Figure 13;

Figure 16 is the structural representation of feather key shown in Figure 13;

Figure 17 is C-C or an E-E section among Figure 16;

Figure 18 is a D-D profile among Figure 16;

Figure 19 is the syllogic feather key installment state figure shown in Figure 14;

State diagram when Figure 20 is the syllogic feather key extraction among Figure 14;

Wherein: 1 fore side roll chock, 2 fore side rolls, 3 transmission side rolls, 4 transmission side roll chocks, 5 rolling mill bases, 5-1 erects end plate, 5-2 horizontal gird; 6 top covers, 7 displacement transducers/encoder, 8 centering hydraulic cylinders, 9 servo hydraulic cylinders, 10 roll balance mechanisms, 11 floating type frames, 12 rolled pieces; 13 Connection Blocks, 18 depress the centering screw rod, 19 centering worm gears, 20 centering worm screws, 21 depress worm gear, and 22 depress worm screw, 23 screw boxs; 24 connecting keys, 25 worm gear pressing plates, 26 keys, 27 pressing plates, 28 annular boss, 29 centering nuts, 30 baffle plates; 31 bearings, 32 reduction cases, 33 depress motor, 34 shaft couplings, 35 clutches, 36 initial adjustment worm gears, 37 initial adjustment worm screws; 38 centering motor, 39 initial adjustment motor, 40 frame bodies, 41 displacement hydraulic cylinders, 42 feather keys, 42a feather key upper end section, 42b feather key interlude; 42c feather key lower end section, 43 frame body keyways, 43a frame body keyway upper end section, 43b frame body intermediate groove, 43c frame body keyway lower end section, 44 housing caps, 45 compress hydraulic cylinder; 46 housing cap rectangle contiguous block keyways, 47 connect end plate, 48 feather key joints, 49 feather key guide heads, 50 hydraulic cylinder seats, 51 depress spiro rods, 52 centering screw rods.

The specific embodiment

Be described further below in conjunction with the specific embodiment of accompanying drawing two roller vertical mills of the present invention.

Referring to Fig. 1,2, shown in 3, two roller vertical mills of the present invention comprise rolling mill base, rolling-mill housing and are installed in two the setting rolls 3,2 and the roll seam guiding mechanism that are arranged in parallel in the rolling-mill housing; For realizing adjustment of two roll seams and roll gap automatic centering, on said rolling mill base 5, also be provided with the roll gap centering body.

Said rolling mill base 5 comprises that one is erect end plate 5-1 and the horizontal gird 5-2 that is connected with four angles of erectting end plate 5-1 respectively; This horizontal gird 5-2 is perpendicular to erectting end plate and extending to same direction; See from end face to be shaped as " recessed " font, shown in Fig. 1-3,2-2.During installation, it erects the transmission side that end plate 5-1 is positioned at milling train, the left side in Fig. 1-1,2-1,3-1.

Regulate for realizing the roll gap automatic centering; Said rolling-mill housing is designed to be embedded among four horizontal gird 5-2 of rolling mill base; Shown in Fig. 1-3; Rolling-mill housing 11 can move horizontally towards transmission side or fore side in four horizontal gird 5-2 of this rolling mill base 5, in Fig. 1-1,2-1,3-1, shows as move left and right, so be called floating type frame 11.

For improving the effect that floating type frame moves horizontally; Respectively be provided with blade fin on said floating type frame 11 and the wall that four horizontal gird 5-2 match, this blade fin can lead with spacing to floating type frame 11 moving horizontally in the rolling mill base crossbeam.

Like this, under the effect of roll seam guiding mechanism, the bearing block 4 of transmission side roll or the bearing block 1 of fore side roll can move horizontally on the window inwall of floating type frame 11, with the dancer rools gap on the one hand; Under the effect of roll gap centering body, floating type frame 11 can move horizontally along the crossbeam 5-2 of rolling mill base 5, and rolling center is remained unchanged on the other hand.Simultaneously; Because of floating type frame 11 can shift out from the fore side of milling train or move into together with two rolls; Just can adopt the kind of drive for two roller vertical mills of the present invention; Thereby eliminated the defective of existing milling train underdrive mode, and reduced the height of transmission mechanism, simplified the syndeton of roll and transmission mechanism.

Said roll gap centering body comprises: movable top cover 6 with the mechanical type transmission mechanism that has the fluid pressure type transmission mechanism of displacement transducer 7 on this top cover 6 or have encoder is installed; Said roll seam guiding mechanism has the fluid pressure type transmission mechanism of displacement transducer 7 or has the mechanical type transmission mechanism of encoder.

Practical implementation: said roll seam guiding mechanism and roll gap centering body can design the transmission side at milling train, also can design the fore side at milling train.

When said roll seam guiding mechanism and roll gap centering body design during at transmission side, can the roll seam guiding mechanism be arranged on the said floating type frame 11 transmission side end plates, the roll gap centering body is arranged on the setting end plate 5-1 of said rolling mill base 5; Fore side roll chock 1 is arranged on floating type frame 11 on the inwall of the end plate of fore side, shown in Fig. 1-1,2-1;

When designing at fore side, the roll seam guiding mechanism is arranged on the said floating type frame 11 fore side end plates, the roll gap centering body is arranged on the horizontal gird 5-2 end of said rolling mill base 5; Transmission side roll chock 4 is arranged on floating type frame 11 on the inwall of the end plate of transmission side, shown in Fig. 3-1.

In addition, when said roll gap centering body was positioned at the setting end plate 5-1 place of rolling mill base 5 transmission sides, the top cover 6 of roll gap centering body can be installed in the outside of erectting end plate 5-1 again, shown in Fig. 1-1,1-2.This version needs elder generation with the top cover 6 of roll gap centering body and the dismounting that is connected of floating type frame when roll change, could floating type frame be shifted out from fore side together with roll seam guiding mechanism and roll etc.

For improving roll change efficient; The top cover 6 of roll gap centering body can also be installed in the inboard of erectting end plate 5-1; Shown in Fig. 2-1; This version need not be removed the top cover 6 of roll gap centering body and being connected of floating type frame earlier when roll change, only need top cover 6 and the fractionation that is connected of erectting end plate 5-1; Associated components such as two rolls in roll seam guiding mechanism, roll gap centering body and floating type frame 11 and the floating type frame 11, roll chock can be together shift out from the not blind end of rolling mill base 5, shown in Fig. 2-3.

In addition, be installed in the fore side of milling train, be connected with the end of four horizontal gird 5-2, shown in Fig. 3-1 at the top cover 6 of roll gap centering body.This version also need not be removed being connected of roll gap centering body and floating type frame earlier when roll change; Only need the be connected fractionation of top cover 6 with horizontal gird 5-2; The roll seam guiding mechanism; Associated components such as two rolls in roll gap centering body and floating type frame 11 and the floating type frame 11, roll chock shift out rolling mill base 5 together, shown in Fig. 3-2.

Top cover 6 is erect end plate 5-1 or being connected of horizontal gird 5-2 can be used bolt with rolling mill base; Or use the TOE other end to have the spiral shell of wedge shape square hole to lean on, and spiral shell is leant on passed top cover 6, be screwed into rolling mill base 5; The other end inserts the square opening that spiral shell is leant on wedge, and top cover 6 is fixing.Also can adopt the connecting mode of other convenient disassembly.

Be example with roll seam guiding mechanism and the design of roll gap centering body in the situation of the transmission side of milling train below, embodiment is following:

Referring to 1,2,4; The fluid pressure type transmission mechanism of said roll seam adjustment; Comprise: a servo hydraulic cylinder 9; This servo hydraulic cylinder 9 is installed on the transmission side end plate of said floating type frame 11, and the end face of its piston rod and corresponding roll chock lean, and expression is to lean on the roll chock 4 of transmission side among the figure.The fluid pressure type transmission mechanism of said roll gap centering comprises two centering hydraulic cylinders 8 that are installed on the said top cover 6, and the piston rod of these two centering hydraulic cylinders 8 passes top cover 6 and is connected with the transmission side end plate of floating type frame 11, like Fig. 1, shown in 2; The fluid pressure type transmission mechanism of perhaps said roll gap centering comprises a centering hydraulic cylinder 8 that is installed on the said top cover 6, and the piston rod of this centering hydraulic cylinder 8 passes top cover 6 and is connected in series with the cylinder body of said servo hydraulic cylinder 9 through Connection Block 13, and is as shown in Figure 4.

Perhaps referring to Fig. 5; The fluid pressure type transmission mechanism of said roll seam adjustment; Comprise: two servo hydraulic cylinders 9; These two servo hydraulic cylinders 9 are installed on the transmission side end plate of floating type frame 11 equally, and the end face of its piston rod leans with the both ends of corresponding roll chock respectively, and expression is to lean on the both ends of the roll chock 4 of transmission side among the figure.。The fluid pressure type transmission mechanism of said roll gap centering comprises a centering hydraulic cylinder 8 that is installed on the said top cover 6, and the piston rod of this centering hydraulic cylinder 8 passes top cover 6 and is connected with the transmission side end plate of said floating type frame 11.

When rolling, the shift motion of above-mentioned centering hydraulic cylinder 8 is 1/2 of servo hydraulic cylinder 9 shift motions, and the moving direction of the moving direction of above-mentioned centering hydraulic cylinder 8 and servo hydraulic cylinder 9 is opposite.

Like this, when adjustment two roll seams, control servo hydraulic cylinder 9 makes transmission side roll 3 move with respect to fore side roll 2, and meanwhile, control centering hydraulic cylinder 8 makes floating type frame 11 carry two rolls 2,3 and moves with respect to rolling mill base together.The shift motion of setting servo hydraulic cylinder 9 is 2 times of centering hydraulic cylinder 8 shift motions; That is: through displacement transducer 7 electric interlocks; Control servo hydraulic cylinder 9 piston rod amount of movements are 2 times of centering hydraulic cylinder 8 piston rod amount of movements, and moving direction to make transmission side roll 3 on the contrary are floating type frame 11 and two rolls 2,3 twices of amount of movement together with respect to the amount of movement of fore side roll 2.

Be reduced to example with two rolls, 3,2 gaps adjustment: suppose: two rolls 3, the total backlash adjustment amount between 2 :-Δ h; The operation principle of above-mentioned adjustment two roll seams is formulated as follows; Wherein: the direction with the X-Z reference axis is a standard; With "+" expression, when the moving direction of roll or floating type frame is opposite with the reference axis Z-direction, represent when the moving direction of roll or floating type frame is identical with the reference axis Z-direction with "-".

If: transmission side roll 3 moves adjustment to the milling train fore side :-Δ h

Floating type frame 11 and two rolls 2,3 move adjustment to the milling train transmission side together :+1/2 Δ h

Then: the actual of transmission side roll 3 moved adjustment to the milling train fore side :-Δ h+1/2 Δ h=-1/2 Δ h

The actual of fore side roll 2 moved adjustment to the milling train transmission side :+1/2 Δ h

Two rolls 3, total backlash adjustment amount: (Δ h+1/2 Δ h)-(+1/2 Δ h) between 2=-Δ h

Floating type frame 11 actual shift motions :+1/2 Δ h

Can learn from the aforementioned calculation result: when the transmission side roll when the milling train fore side moves adjustment-1/2 Δ h; Fore side roll 2 correspondingly moves adjustment+1/2 Δ h to the milling train transmission side; Floating type frame also correspondingly moves+1/2 Δ h simultaneously, thereby relatively moves two rolls 3,2, has realized that not only the gap of transmission side roll 3 and fore side roll 2 reduces adjustment; And the roll gap of two rolls 3,2 can be regulated the invariant position at maintenance roll gap center in automatic centering.And two rolls 3, the total backlash adjustment amount is-Δ h between 2, that is: two roll seam adjustment amounts also are that the adjustment amount of depressing of rolled piece is-Δ h.

Otherwise, if two rolls, 3,2 gaps are adjusted into when increasing, that is: hypothesis: two rolls 3, the total backlash adjustment amount between 2 :+Δ h; Synergy because of roll balance mechanism 10 pretension counter-forces; Transmission side roll chock 4 abuts against the piston rod end of servo hydraulic cylinder 9 all the time, and equally through displacement transducer 7 electric interlocks, control servo hydraulic cylinder 9 piston rod amount of movements are 2 times of centering hydraulic cylinder 8 piston rod amount of movements; And moving direction is opposite; Make transmission side roll 3 when the milling train transmission side moves adjustment one 1/2 Δ h, fore side roll 2 correspondingly moves adjustment+1/2 Δ h to the milling train fore side, and floating type frame also correspondingly moves adjustment+1/2 Δ h to the milling train fore side simultaneously; Thereby move two rolls 3,2; Not only realized the gap adjustment of transmission side roll 3 with fore side roll 2, and the roll gap automatic centering of two rolls 3,2 adjusting, still can keep the invariant position at roll gap center.Its operation principle is identical, is not going to repeat.

When adjusting the initial position of two roll seams; At first control the centering hydraulic cylinder 8 of roll gap centering body; Move floating type frame 11, make the roll gap center adjustment to desired location, and then through displacement transducer 7 electric interlocks; The servo hydraulic cylinder 9 of control roll seam guiding mechanism and the centering hydraulic cylinder 8 of roll gap centering body are adjusted to preset definite value with the gap of two rolls 3,2; The roll gap that guarantees each milling train is centered close on the rolling centerline, satisfies rolling requirement.

After setting in the roll gap center, carry out the roll seam adjustment in the continuous rolling, referring to Fig. 1, rolled piece 12 passes two rolls 3, roll gap between 2 along rolling centerline F-F, and it is rolling by the body of roll of two rolls rolled piece to be carried out transverse horizontal.According to rolling requirement, control servo hydraulic cylinder 9 is implemented transmission side roll 3 and is moved adjustment; Control centering hydraulic cylinder 8 simultaneously, the mobile adjustment of the half trip relatively of floating type frame 11 and fore side roll 2 makes two roll seams adjust to setting value, and the roll gap center is constant simultaneously.

In like manner; Referring to Fig. 6,8; The mechanical type transmission mechanism of said roll seam adjustment; Comprise that a cover depresses worm-and-wheel gear, this is depressed worm-and-wheel gear and comprises: the depress spiro rod 51 that is arranged on a screw box 23 on the transmission side end plate of said floating type frame 11 and is threaded with screw box 23; One end of said depress spiro rod 51 leans on corresponding roll chock; Expression is to lean on the roll chock 4 of transmission side among the figure; The other end is equipped with through connecting key 24 and depresses worm gear 21; This is depressed worm gear 21 and depresses worm screw 22 engagements, depresses worm gear 21, depresses worm screw 22 and bearing 31 is installed in the reduction case 32 together, and reduction case 32 is fixedly connected with the transmission side end plate of floating type frame 11.The said worm gear 21 of depressing is fastenedly connected with connecting key 24, and connecting key 24 is slidingly matched with the keyway of depress spiro rod 51.

The mechanical type transmission mechanism of said roll gap centering is two cover centering worm-and-wheel gears; Every cover centering worm-and-wheel gear comprises: the centering screw rod 52 that is arranged on the centering nut 29 on the said top cover 6 and is threaded with centering nut 29; Centering worm gear 19 is installed on the centering nut 29, and both connections can connect through conventional connected mode such as key 26 grades.Centering worm gear 19 and 20 engagements of centering worm screw.Two centering screw rods 52 pass top cover 6 respectively and are connected with the transmission side housing cap of said floating type frame 11, are connected through clutch 35 between two centering worm screws 20; As shown in Figure 8.The mechanical type transmission mechanism of perhaps said roll gap centering is a cover centering worm-and-wheel gear, and this centering worm-and-wheel gear comprises: the centering screw rod 52 that is arranged on the centering nut 29 on the said top cover 6 and is threaded with centering nut 29; Centering screw rod 52 passes top cover 6 and is connected in series with said reduction case 32 through Connection Block 13; Centering nut 29 is connected with centering worm gear 19 through key 26, and centering worm gear 19 and 20 engagements of centering worm screw are as shown in Figure 6.

Referring to Fig. 7; The mechanical type transmission mechanism of said roll seam adjustment; Comprise that two covers depress worm-and-wheel gear; Every cover is depressed worm-and-wheel gear and is comprised: the depress spiro rod 51 that is arranged on a screw box 23 on the transmission side end plate of said floating type frame 11 and is threaded with screw box 23, and an end of said depress spiro rod 51 leans on corresponding roll chock, and expression is to lean on the roll chock 4 of transmission side among the figure; The other end is equipped with through connecting key 24 and depresses worm gear 21; This is depressed worm gear 21 and depresses worm screw 22 engagements, depresses worm gear 21, depresses worm screw 22 and bearing 31 is installed in the reduction case 32 together, and reduction case 32 is fixedly connected with the transmission side end plate of floating type frame 11; The said worm gear 21 of depressing is fastenedly connected with connecting key 24, and connecting key 24 is slidingly matched with the keyway of depress spiro rod 51; Two covers in the mechanisms depress worm screw 22 through shaft coupling 34 with depress motor 33 and be connected, depress for two and be provided with clutch 35 between the worm screw 22.

The mechanical type transmission mechanism of said roll gap centering is a cover centering worm-and-wheel gear; This centering worm-and-wheel gear comprises: the centering screw rod 52 that is arranged on the centering nut 29 on the said top cover 6 and is threaded with centering nut 29; Centering nut 29 is connected with centering worm gear 19 through key 26, centering worm gear 19 and 20 engagements of centering worm screw; Centering screw rod 52 passes top cover 6 and is connected with the transmission side end plate of said floating type frame 11.

One end of said centering nut 29 has pressing plate 27, in the other end baffle plate 30 is set during installation, is a cylindrical shape perhaps, at two ends baffle plate 30 is set during installation, all can it be installed on the top cover 6.

Depress worm screw 22 and be provided with encoder, this encoder also can be arranged on the motor of depressing worm screw 22.

Centering worm screw 20 is provided with encoder, and this encoder also can be arranged on the motor of centering worm screw.

When rolling, the shift motion of said centering screw rod 52 is 1/2 of depress spiro rod 51 shift motions, and the moving direction of said centering screw rod 52 is opposite with depress spiro rod 51 moving directions.

One side of said centering worm gear 19 has annular boss 28, has the cannelure that matches with the annular boss 28 of centering worm gear 19 on the said top cover 6, locatees on circumference to ensure centering worm gear 19, like Fig. 6,7,8.The wheel rim place that is positioned at centering worm gear 19 on the said top cover 6 is provided with worm gear pressing plate 25; Like Fig. 6,7,8; So that when integral hoisting centering nut 29, centering worm gear 19 and top cover 6, this worm gear pressing plate 25 can carry out spacing to the centering worm gear 19 in the lifting, prevents 19 slippages of centering worm gear.

For reducing the resistance and the service life of improving centering worm gear 19 and centering nut 29 in the above-mentioned adjustment process, the annular boss 28 of said centering worm gear 19 can be provided with rolling bearing or abrasion-resistant slide bearing with pressing plate 27, centering nut 29 with the moving surface of top cover 6 with the cannelure of top cover 6, centering worm gear 19.Certainly, more simplify for making overall structure, centering nut 29, pressing plate 27 and baffle plate 30 and centering worm gear 19 also can be processed by Cu alloy material.

Like this; When adjustment two roll seams, by depressing motor 33 through depressing worm screw 22, depressing worm gear 21 and connecting key 24 rotation depress spiro rods 51, control depress spiro rod 51 shift motions; Transmission side roll 3 is moved, meanwhile with respect to fore side roll 2; Rotate centering nut 29 by centering motor 38 through centering worm screw 20, centering worm gear 19 and key 26, control centering screw rod 52 shift motions make floating type frame 11 carry two rolls 2,3 and move with respect to rolling mill base 5 together.The shift motion of setting depress spiro rod 51 is 2 times of centering screw rod 52 shift motions; That is: depressing motor 33, centering motor 38 through the control of encoder 7 electric interlocks rotates respectively; The shift motion of depress spiro rod 51 is 2 times of centering screw rod 52 shift motions; And moving direction is opposite, and making transmission side roll 3 is floating type frame 11 and two rolls 2,3 twices of amount of movement together with respect to the amount of movement of fore side roll 2.Its operation principle is identical with the operation principle of adjustment of fluid pressure type roll seam and roll gap centering body, and is succinct for making literal, is not going to repeat.

Referring to Fig. 9,10,11,12; For simplifying above-mentioned mechanical structure and control; Above-mentioned depress spiro rod 51 is made up with centering screw rod 52; That is: depress centering screw rod 18 with one and substitute above-mentioned depress spiro rods 51 and centering screw rods 52, and be provided with one and depress worm gear of motor 33 transmissions and can accomplish above-mentioned upper and lower roll seam adjustment and roll gap automatic centering.

The specific embodiment is: the mechanical type transmission mechanism of said roll gap gap adjustment can be depressed the centering worm-and-wheel gear for a cover, also can depress the centering worm-and-wheel gear for two covers.Every cover is depressed the centering worm-and-wheel gear and is comprised: be arranged on a screw box 23 in said floating type frame 11 end plates and be threaded with screw box 23 depress centering screw rod 18; This end of depressing centering screw rod 18 leans on corresponding roll chock; Expression is to lean on the roll chock 4 of transmission side among the figure; The other end is equipped with through connecting key 24 and depresses worm gear 21; This depress worm gear 21 with have an encoder depress worm screw 22 engagements, depress worm gear 21, depress worm screw 22 and bearing 31 is installed in the reduction case 32 together, reduction case is fixedly connected with the transmission side end plate of floating type frame 11.The said worm gear 21 of depressing is fastenedly connected with connecting key 24, and connecting key 24 is slidingly matched with the keyway of depressing centering screw rod 18; When being that two covers are when depressing the centering worm-and-wheel gear; Two depress in the worm screw 22 one through shaft coupling 34 with depress motor 33 and be connected; Depress for two and be provided with clutch 35 between the worm screw 22, shown in figure 11, or two depressed worm screw 22 and be connected with separately the motor 33 of depressing through shaft coupling 34 respectively; Depress for two and be provided with clutch 35 between the worm screw 22, shown in figure 12.

The mechanical type transmission mechanism of said roll gap centering comprises: be arranged on the centering nut 29 on the said top cover 6; This centering nut 29 is threaded with the centering screw rod 18 of depressing of the mechanical type transmission mechanism of roll seam adjustment; The said pitch of depressing centering screw rod 18 and centering nut 29 screw threads is to depress 1/2 of pitch between centering screw rod 18 and the screw box 23, and the said rotation direction of depressing centering screw rod 18 and screw box 23 screw threads is with to depress centering screw rod 18 identical with the rotation direction of centering nut 29 screw threads.

Like this, during two roll seams, initial adjustment this moment worm gear 36 is not worked in adjustment, depresses motor 33 through depressing worm screw 22, depressing worm gear 21 and connecting key 24 and rotate and depress centering screw rod 18.Is to be threaded because of depressing centering screw rod 18 with screw box 23; Screw box 23 is become one with floating type frame 11; When depressing 18 rotations of centering screw rod, floating type frame 11 moves with respect to transmission side roll 3 with fore side roll 2 together, meanwhile; Also be threaded with centering nut 29 because of depressing centering screw rod 18; Depress centering screw rod 18 and in centering nut 29, rotate, and centering nut 29 does not rotate, centering screw rod 18 drives floating type frame and two rolls move with respect to rolling mill base together so depress.Because centering nut 29 is to depress centering screw rod 18 and 1/2 of screw box 23 pitch with the pitch of depressing centering screw rod 18; And thread rotary orientation is identical; So above-mentioned two move adjustment after, floating type frame 11 and fore side roll 2 amount of movements are 2 times of amount of movement and in the opposite direction together on floating type frame 11 and two rolls.

Be reduced to example with two rolls, 3,2 gaps adjustment: suppose: two rolls 3, the total backlash adjustment amount between 2 :-Δ h; The operation principle of above-mentioned adjustment two roll seams is following with formulae express; Wherein: the direction with the X-Z reference axis is a standard, when the moving direction of roll or floating type frame is identical with the reference axis Z-direction, with "+" expression; When the moving direction of roll or floating type frame is opposite with the reference axis Z-direction, with "-" expression.

If: depress centering screw rod 18 and be right-handed thread, turn clockwise when depressing centering screw rod 18, depress centering screw rod 18 and in screw box 23, turn clockwise when depressing worm gear 21 with screw box 23, centering nut 29.At this moment, screw box 23 and floating type frame 11 and fore side roll 2 are depressed centering screw rod 18 and transmission side roll 3 to milling train transmission side amount of movement is :+Δ h together relatively

Simultaneously, depress centering screw rod 18 and in centering nut 29, turn clockwise, make and depress that centering screw rod 18 drives floating type frame 11, two rolls 3,2 to milling train fore side amount of movement are again together :-1/2 Δ h

Then: the actual of transmission side roll 3 moved adjustment to the milling train fore side :-1/2 Δ h

The actual of fore side roll 2 moved adjustment to the milling train transmission side :+Δ h-1/2 Δ h=+1/2 Δ h

Two rolls 3, total backlash adjustment amount :-1/2 Δ h-(+1/2 Δ h) between 2=-Δ h

Floating type frame 11 actual shift motions :+Δ h-1/2 Δ h=+1/2 Δ h

Can learn from above result of calculation: when transmission side roll 3 when the milling train fore side moves adjustment-1/2 Δ h; Fore side roll 2 correspondingly moves adjustment+1/2 Δ h to the milling train transmission side; Floating type frame also correspondingly moves adjustment+1/2 Δ h to the milling train transmission side simultaneously, thereby relatively moves two rolls 3,2, has realized that not only the gap of transmission side roll 3 and fore side roll 2 reduces adjustment; And the roll gap of two rolls 3,2 can be regulated the invariant position at maintenance roll gap center in automatic centering.And two rolls 3, the total backlash adjustment amount is-Δ h between 2, that is: two roll seams adjustment variable quantity just the adjustment amount of depressing of rolled piece be-Δ h.

Otherwise; When depressing motor 33 counter-rotating, depress worm gear 21 and be rotated counterclockwise and depress centering screw rod 18, at this moment; Depressing centering screw rod 18 is rotated counterclockwise in screw box 23; Because of the synergy of roll balance mechanism 10 pretension counter-forces, transmission side roll chock 4 abuts against the end of depressing centering screw rod 18 all the time, the relative together transmission side roll 3 of floating type frame 11 and fore side roll 2 is carried out to milling train fore side amount of movement be :-Δ h

Simultaneously, depress centering screw rod 18 and in centering nut 29, be rotated counterclockwise, make depress centering screw rod 18 drive floating type frames 11 and two rolls 3,2 carry out round about together to milling train transmission side amount of movement be :+1/2 Δ h

Then: the actual of transmission side roll 3 moved adjustment to the milling train transmission side :+1/2 Δ h

The actual of fore side roll 2 moved adjustment to the milling train fore side :-Δ h+1/2 Δ h=-1/2 Δ h

Two rolls 3, total backlash adjustment amount :+1/2 Δ h-(1/2 Δ h) between 2=+ Δ h

Floating type frame 11 actual shift motions :-Δ h+1/2 Δ h=-1/2 Δ h

Can learn from above result of calculation: when transmission side roll 3 to the milling train transmission side move+during 1/2 Δ h; Fore side roll 2 correspondingly moves-1/2 Δ h to the milling train fore side; Floating type frame also correspondingly moves-1/2 Δ h to the milling train fore side simultaneously, thereby relatively moves two rolls 3,2, has not only realized the gap increase adjustment of transmission side roll 3 with fore side roll 2; And the roll gap of two rolls 3,2 can be regulated the invariant position at maintenance roll gap center in automatic centering.And two rolls 3, the total backlash adjustment amount is between 2 :+Δ h, that is: same two roll seam adjustment amounts just the adjustment amount of depressing of rolled piece be+Δ h.

Be left hand thread if depress centering screw rod 18 with screw box 23, centering nut 29, the operation principle of its two roll seams adjustment is identical with above-mentioned two roll seams adjustment operation principle, is not going to repeat.

In addition, for regulating the initial position at two roller gap centers, initial adjustment worm gear 36 is installed on said centering nut 29, both connections can connect through conventional connected mode such as key 26 grades.Initial adjustment worm gear 36 and 37 engagements of initial adjustment worm screw, initial adjustment worm screw 37 is connected with initial adjustment motor 39 through shaft coupling.Like this; Control initial adjustment motor 39 transmission initial adjustment worm screws 37, initial adjustment worm gear 36 drive centering nuts 29 and rotate; Depressing centering screw rod 18 floating type frame 11 and two rolls 3,2 at the vertical direction band and moves together; Preset definite value is adjusted at the roll gap center of two rolls 3,2, guaranteed that the roll gap of each milling train is centered close on the rolling centerline, satisfy rolling requirement.

After setting in the roll gap center, carry out the roll seam adjustment in the continuous rolling, referring to Figure 19,20, rolled piece 12 passes two rolls 3, roll gap between 2 along rolling centerline F-F, and it is rolling by the body of roll of two rolls rolled piece to be carried out transverse horizontal.According to rolling requirement, motor 33 is depressed in control, through depressing worm screw 22, depressing worm gear 21 and make and depress centering screw rod 18 and rotate; By means of floating type frame; Implementation and operation side roll 2 moves, and while transmission side roll 3 is moving of half trip relatively, makes two roll seams adjust to setting value; The roll gap center is constant simultaneously, and the variable quantity of roll seam adjustment is by depressing motor 33 or depressing encoder 7 controls that worm screw 22 is connected.

One side of said initial adjustment worm gear 36 has annular boss 28, has the cannelure that matches with the annular boss 28 of initial adjustment worm gear 36 on the said top cover 6, and initial adjustment worm gear 36 is located on circumference.The wheel rim place that is positioned at initial adjustment worm gear 36 on the said top cover 6 is provided with worm gear pressing plate 25.So that when integral hoisting centering nut 29, initial adjustment worm gear 36 and top cover 6, this worm gear pressing plate 25 can carry out spacing to the initial adjustment worm gear 36 in the lifting, prevents 36 slippages of initial adjustment worm gear.

For reducing the resistance and the service life of improving initial adjustment worm gear 36 and centering nut 29 in the above-mentioned adjustment process, said initial adjustment worm gear 36 annular boss 28 can be provided with rolling bearing or abrasion-resistant slide bearing with pressing plate 27, centering nut 29 with the moving surface of top cover 6 with cannelure, the initial adjustment worm gear 36 of top cover 6.Certainly, more simplify for making overall structure, centering nut 29, pressing plate 27 and baffle plate 30 and initial adjustment worm gear 36 also can be processed by Cu alloy material.

For the dismounting of roll gap centering body; Usually; To depress centering screw rod 18 earlier is screwed in the screw box 23 that is installed in the floating type frame 11; To depress worm gear 21 then, depress worm screw 22, bearing 31 and reduction case 32 and other relevant accessories be assembled into to be enclosed within behind the worm reducer and depress on the centering screw rod 18; And with depress motor 33 and be fixed on together on the floating type frame 11, simultaneously with worm reducer with depress between motor 33 output shafts continuously, afterwards said floating type frame 11 is inserted in the rolling mill base 5 together with two related components such as roll chock with shaft coupling 34; Second goes on foot, and centering nut 29 is screwed into depresses centering screw rod 18 upper ends, selects for use this moment centering nut 29 and baffle plate 30 to become the structural shape of one; In the 3rd step, initial adjustment worm gear 36, initial adjustment worm screw 37, initial adjustment motor 39 and bearing, worm gear pressing plate 25 etc. are installed on the top cover 6, and shaft coupling 34 is installed on the relevant position; The 4th step; With top cover 6 and relevant parts such as superincumbent initial adjustment worm gear 36, initial adjustment worm screw 37, initial adjustment motor 39 and bearing, worm gear pressing plate 25 are installed are together sling and be enclosed within on the centering nut 29, and load key 26 in the keyway on centering nut 29 and initial adjustment worm gear 36 composition surfaces.At last, pressing plate 27 is installed, top cover 6 is fixed on the rolling mill base 5 with bolt in the upper end of centering nut 29.

The above is to design on said floating type frame 11 transmission side end plates to the roll seam guiding mechanism; Roll gap centering body design is at the setting end plate 5-1 place of rolling mill base 5, and the bearing block 1 of fore side roll is fixedly mounted on floating type frame 11 and is positioned at the situation on the inwall of fore side end plate of milling train.

Design on said floating type frame 11 fore side end plates for the roll seam guiding mechanism; Roll gap centering body design is at the place, horizontal gird 5-2 end of rolling mill base 5, and the bearing block 1 of transmission side roll is fixedly mounted on floating type frame 11 and is positioned at the situation on the inwall of transmission side end plate of milling train; Said roll seam guiding mechanism and roll gap centering body are fluid pressure type or mechanical type equally; Its servo hydraulic cylinder 9, centering hydraulic cylinder 8, depress worm-and-wheel gear, centering worm-and-wheel gear or depress the centering worm-and-wheel gear the quantity setting, pattern is installed, and all the specific embodiment with above-mentioned is identical; Its operation principle of adjusting two roll seams also is identical; For making literal succinct; Be not going to repeat, roll seam shown in Figure 3 guiding mechanism is that a servo hydraulic cylinder 9, roll gap centering body are the specific embodiment of two centering hydraulic cylinders 8.

Referring to Figure 13,14, for further improving roll change efficient, said floating type frame 11 is designed to detachable frame, and it comprises frame body 40, housing cap 44 and is used to be connected the retaining mechanism of frame body 40 and housing cap 44.

The cross sectional shape of said frame body 40 is the unsealed rectangle of a side, does not seal the fore side of side towards milling train during installation, thereby roll chock can shift out or move into from the fore side Direct Water level land of milling train.Have window on the two relative risers of said frame body 40, be positioned at the inner face of the riser of sealing end not and have respectively and the equipped keyway 43 of housing cap 44 rectangle contiguous block keyways 46, its outside has the male half coupling that cooperates with housing cap 44.

The inner stopper that said housing cap 44 has the rectangle contiguous block that connects end plate 47, match with the internal orifice of frame body 40 and is equipped with mutually with the male half coupling of frame body 40; Its section configuration is similar to " mountain " font; Have the keyway 46 that is equipped with 40 liang of riser keyways of frame body 43 on the relative two sides of said rectangle contiguous block, as shown in Figure 6.

Like this; The inner stopper of the male half coupling of above-mentioned frame body 40 and housing cap 44 plays the effect of located lateral frame body 40; When preventing that floating type frame 11 receives roll-force, two risers of frame body 40 are outwards distortion laterally, to strengthen the rigidity of the floating type frame of split-type.

Said retaining mechanism comprises: what be installed in feather key 42 in the keyway 46,43 of housing cap 44 and frame body 40, control the hydraulic cylinder 41 of these feather key 42 displacements and be installed in housing cap 44 outsides compresses hydraulic cylinder 45.The said piston rod that compresses hydraulic cylinder 45 passes housing cap and connects end plate 47, is resisted against the end of frame body 40, the gap that is used to eliminate feather key 42 stressed contact-making surfaces; The hydraulic cylinder seat 50 of said displacement hydraulic cylinder 41 is installed on the upper surface of said housing cap 44 rectangle contiguous blocks, and its piston rod is connected with the upper end of feather key 42.

Said feather key 42 comprises the joint 48 of cuboid and the guide head 49 of connected " T " font, and its shape similar " worker " word steel is shown in figure 17.

After said feather key 42 is installed in the keyway 46 of keyway 43 and housing cap 44 of said frame body 40; The interface X-X of two keyways is the diagonal angle joint face Z-Z of cuboid of the joint 48 of feather key 42; So the keyway shape on frame body 40 is the right angled triangle keyway; The special-shaped keyway that is shaped as a right angled triangle and " T " font combination of the keyway 46 on the housing cap, shown in figure 15.

Like this; When the rectangle contiguous block of two risers that connect frame body 40 and housing cap 44, drive displacement hydraulic cylinder 41, its piston rod passes the cylinder seat; Feather key 42 is mounted respectively in keyway 43,46; Driving compresses hydraulic cylinder 45, and its piston rod passes housing cap and connects end plate 47, and its end is resisted against the end of frame body.When needs are removed being connected of frame body 40 risers and housing cap rectangle contiguous block, drive and compress hydraulic cylinder 45, the thrust of elimination frame body end; Drive displacement hydraulic cylinder 41, its piston rod band feather key 42 and in keyway 43,46, is raised; After feather key 42 was extracted out fully, frame body 40 vertical plates and housing cap rectangle contiguous block were just thrown off, and can carry out roller replacing operation or accident treatment work subsequently.

Referring to Figure 16 and Figure 19,20; In order to reduce the stroke of displacement hydraulic cylinder 41, reduce the height of retaining mechanism, said feather key 42 is divided into three sections 42a, 42b, 42c at length direction; The shape of two ends section 42a, 42c is identical; Comprise the joint 48 of cuboid and the guide head 49 of connected " T " font, its shape similar " worker " word steel, shown in figure 17; The joint 48 of its interlude 42b be shaped as right angled triangle, guide head 49 still is " T " font, and is shown in figure 18.The length of two ends section is all less than 1/3 of feather key total length.

Equally; The right angled triangle keyway of said frame body 40 also is divided into three sections 43a, 43b, 43c at length direction; The shape of two ends section 43a, 43c is identical, and its interlude has holding tank 43b, and the shape of this holding tank 43b can be rectangle or other shape; The width of holding tank 43b is an opening more than or equal to the width on two ends paragraph key groove 43a, 43c right angled triangle base and along fore side, and the degree of depth is slightly larger than the degree of depth of two ends paragraph key groove 43a, 43c right angled triangle.

Like this; When needs connect 40 liang of risers of frame body and housing cap 44 rectangle contiguous blocks; Drive displacement hydraulic cylinder 41, it is the next that its piston rod is being with feather key 42 to be in downwards, at this moment riser and the completion that cooperatively interacts that is actually being connected of rectangle contiguous block by upper end section 42a and keyway epimere 43a, lower end section 42c and the keyway lower end section 43c of feather key 42; The interlude 42b of feather key 42 does not play any connection effect, and is shown in figure 19.When needs are removed being connected of 40 liang of risers of frame body and housing cap 44 rectangle contiguous blocks, drive and compress hydraulic cylinder 45, the thrust of elimination frame body end; Drive displacement hydraulic cylinder 41, its piston rod band feather key 42 and in keyway, is raised; When the lower end of feather key 42 section 42c walks to holding tank 43b; It is upper to be that feather key is in; The right angled triangle end of its rectangle joint 48 breaks away from the constraint of frame body 40 lower end section right angled triangle keyway 43c; The special-shaped joint 48 of the interlude 42b of feather key 42 is arranged in the special-shaped keyway of housing cap, and the upper end section 42a of feather key 42 is positioned at hydraulic cylinder seat 50, and feather key 42 is removed with the quilt that is connected of the keyway of frame body 40 fully; Frame body 40 risers and housing cap 44 rectangle contiguous blocks are in disengaged condition, and are shown in figure 20.But; The guide head 49 of feather key 42 still is installed on the housing cap 44 rectangle cube contiguous blocks; Can move with housing cap 44; The control roll change mechanism; Housing cap 44 just with feather key mounted thereto 42, displacement hydraulic cylinder 41 and hydraulic cylinder seat 50, compress hydraulic cylinder 4 and together be fixed on fore side roll chock 1 and roll 2 or housing cap 44 on the housing cap 44 together with fore side roll chock 1, roll 2,3 and transmission side roll chock 4 from the shifting out or moving into of frame body 40 fore side opening part levels, therefore shortened the stroke of displacement hydraulic cylinder 41, can reduce the stroke more than 2/3; The displacement hydraulic cylinder 41 that has reduced again and the total height of hydraulic cylinder seat 50; Also simplify the installation and removal of frame body and housing cap 44, further reduced roller replacing operation or handled attaching the time of helping of stifled steel accident, improved operating rate.

Equally; When being detachable frame for floating type frame 11; The guiding mechanism design of said roll seam is on the end plate of the frame body 40 of floating type frame 11; Roll gap centering body design is at the setting end plate 5-1 place of rolling mill base 5, and the bearing block 1 of fore side roll is fixedly mounted on the end face of rectangle contiguous block of housing cap 44.Wherein: said roll seam guiding mechanism and roll gap centering body are fluid pressure type or mechanical type equally; Its servo hydraulic cylinder 9, centering hydraulic cylinder 8, depress worm-and-wheel gear, centering worm-and-wheel gear or depress the centering worm-and-wheel gear the quantity setting, pattern is installed is that the specific embodiment of hollow frame is identical with above-mentioned rolling-mill housing all; Its operation principle of adjusting two roll seams also is identical; For making literal succinct; Be not going to repeat, Figure 13, the guiding mechanism of roll seam shown in 14 are that a servo hydraulic cylinder 9, roll gap centering body are the specific embodiment of two centering hydraulic cylinders 8.

Claims (16)

1. roller vertical mill; Comprise rolling mill base, rolling-mill housing and be installed in two the setting rolls (3,2) and the roll seam guiding mechanism that are arranged in parallel in the rolling-mill housing; It is characterized in that: said rolling mill base (5) comprises erects end plate (5-1) and the horizontal gird (5-2) that is connected with four angles of erectting end plate (5-1) respectively; This horizontal gird (5-2) is perpendicular to erectting end plate and extending to same direction; Said rolling-mill housing is floating type frame (11); Be embedded in four horizontal girds of rolling mill base, said roll seam guiding mechanism is installed in the transmission side or the fore side of milling train, also is provided with the roll gap centering body in the same side with roll seam guiding mechanism.

2. two roller vertical mills according to claim 1; It is characterized in that: when said roll seam guiding mechanism and roll gap centering body were arranged on transmission side, fore side roll chock (1) was arranged on floating type frame (11) on the inwall of the end plate of fore side; When said roll seam guiding mechanism and roll gap centering body were arranged on fore side, transmission side roll chock (4) was arranged on floating type frame (11) on the inwall of the end plate of transmission side.

3. two roller vertical mills according to claim 1 and 2; It is characterized in that: said roll gap centering body comprises setting end plate (5-1) or the movable top cover (6) on horizontal gird (5-2) end that is arranged on said rolling mill base (5) and is installed in the fluid pressure type transmission mechanism that has displacement transducer (7) on this top cover (6), or has the mechanical type transmission mechanism of encoder;

Said roll seam guiding mechanism has the fluid pressure type transmission mechanism of the displacement transducer (7) that is connected with floating type frame (11) or has the mechanical type transmission mechanism of encoder.

4. two roller vertical mills according to claim 3; It is characterized in that: the fluid pressure type transmission mechanism of said roll seam adjustment; Comprise: one or two servo hydraulic cylinder (9); This servo hydraulic cylinder (9) is installed on the end plate of said floating type frame (11), and the end face of its piston rod and corresponding roll chock lean.

5. two roller vertical mills according to claim 3; It is characterized in that: the mechanical type transmission mechanism of said roll gap gap adjustment is that a cover or two covers are depressed worm-and-wheel gear; Every cover is depressed worm-and-wheel gear and is comprised: the depress spiro rod (51) that is arranged on the screw box (23) on said floating type frame (11) end plate and is threaded with screw box (23); One end of said depress spiro rod (51) leans on corresponding roll chock; The other end is equipped with through connecting key (24) and depresses worm gear (21); This is depressed worm gear (21) and depresses worm screw (22) engagement, depresses worm gear (21), depresses worm screw (22) and bearing (31) is installed in the reduction case (32) together, and reduction case (32) is fixedly connected with floating type frame (11) end plate; The said worm gear (21) of depressing is fastenedly connected with connecting key (24), and connecting key (24) is slidingly matched with the keyway of depress spiro rod (51); When being two covers when depressing worm-and-wheel gear, in the two cover mechanisms one depress worm screw (22) through shaft coupling (34) with depress motor (33) and be connected, depress for two and be provided with clutch (35) between the worm screw (22).

6. two roller vertical mills according to claim 3; It is characterized in that: the fluid pressure type transmission mechanism of said roll gap centering; Comprise one or two centering hydraulic cylinder (8) that is installed on the said top cover (6); The shift motion of said centering hydraulic cylinder (8) is 1/2 of servo hydraulic cylinder (a 9) shift motion, and the moving direction of the moving direction of said centering hydraulic cylinder (8) and said servo hydraulic cylinder (9) is opposite; When being a centering hydraulic cylinder, piston rod passes top cover (6) and is connected in series with the cylinder body of said servo hydraulic cylinder (9) through Connection Block (13), or piston rod passes top cover (6) and is connected with said floating type frame (11) end plate; When being two centering hydraulic cylinders (8), piston rod passes top cover (6) and is connected with floating type frame (11) end plate.

7. two roller vertical mills according to claim 3; It is characterized in that: the mechanical type transmission mechanism of said roll gap centering is a cover or two cover centering worm-and-wheel gears; Every cover centering worm-and-wheel gear comprises: the centering screw rod (52) that is arranged on the centering nut (29) on the said top cover (6) and is threaded with centering nut (29); Centering worm gear (19) is installed on the said centering nut (29); Centering worm gear (19) and centering worm screw (20) engagement, the shift motion of said centering screw rod (52) is 1/2 of depress spiro rod (a 51) shift motion, the moving direction of said centering screw rod (52) is opposite with depress spiro rod (51) moving direction; When being a cover centering worm-and-wheel gear, centering screw rod (52) passes top cover (6) and is connected in series with said reduction case (32) through Connection Block (13), or centering screw rod (52) passes top cover (6) and is connected with said floating type frame (11) end plate; When being two cover centering worm-and-wheel gears, two centering screw rods (52) pass top cover (6) respectively and are connected with said floating type frame (11) end plate, and two centering worm screws (20) are connected through clutch (35).

8. two roller vertical mills according to claim 7; It is characterized in that: a side of said centering worm gear (19) has annular boss (28); Have the cannelure that matches with the annular boss (28) of centering worm gear (19) on the said top cover (6), the wheel rim place that is positioned at centering worm gear (19) on the said top cover (6) is provided with worm gear pressing plate (25).

9. two roller vertical mills according to claim 3; It is characterized in that: the mechanical type transmission mechanism of said roll seam adjustment is that a cover or two covers are depressed the centering worm-and-wheel gear; Every cover is depressed the centering worm-and-wheel gear and is comprised: be arranged on the screw box (23) in said floating type frame (11) end plate and be threaded with screw box (23) depress centering screw rod (18); This end of depressing centering screw rod (18) leans on corresponding roll chock; The other end is equipped with through connecting key (24) and depresses worm gear (21); This depress worm gear (21) with have an encoder depress worm screw (22) engagement, depress worm gear (21), depress worm screw (22) and bearing (31) is installed in the reduction case (32) together, reduction case (32) is fixedly connected with floating type frame (11) end plate; The said worm gear (21) of depressing is fastenedly connected with connecting key (24), and connecting key (24) is slidingly matched with the keyway of depressing centering screw rod (18); When being that two covers are when depressing the centering worm-and-wheel gear; Two depress in the worm screw (22) one through shaft coupling (34) with depress motor (33) and be connected; Depress for two and be provided with clutch (35) between the worm screw (22); Or two depressed worm screw (22) and be connected with separately the motor (33) of depressing through shaft coupling (34) respectively, depresses for two and be provided with clutch (35) between the worm screw (22).

10. according to claim 3 or 9 described two roller vertical mills; It is characterized in that: the mechanical type transmission mechanism of said roll gap centering; Comprise the centering nut (29) that is arranged on the said top cover (6); This centering nut (29) is threaded with the centering screw rod (18) of depressing of the mechanical type transmission mechanism of roll seam adjustment; The said pitch of depressing centering screw rod (18) and centering nut (29) screw thread is to depress 1/2 of pitch between centering screw rod (18) and the screw box (23), and the said rotation direction of depressing centering screw rod (18) and screw box (23) screw thread is with to depress centering screw rod (18) identical with the rotation direction of centering nut (29) screw thread.

11. two roller vertical mills according to claim 10; It is characterized in that: go up at said centering nut (29) initial adjustment worm gear (36) is installed; Initial adjustment worm gear (36) and initial adjustment worm screw (37) engagement, initial adjustment worm screw (37) is connected with initial adjustment motor (39) through shaft coupling.

12. two roller vertical mills according to claim 11; It is characterized in that: a side of said initial adjustment worm gear (36) has annular boss (28); Have the cannelure that matches with the annular boss (28) of initial adjustment worm gear (36) on the said top cover (6), the wheel rim place that is positioned at initial adjustment worm gear (36) on the said top cover (6) is provided with worm gear pressing plate (25).

13. two roller vertical mills according to claim 1 and 2; It is characterized in that: said floating type frame (11) is for split-type, comprise its cross sectional shape be the unsealed rectangle of a side frame body (40), be positioned at the housing cap (44) and the retaining mechanism that is used to be connected frame body (40) and housing cap (44) of the not sealing part of frame body;

Have window on the two relative risers of said frame body (40), at the frame body keyway (43) that inner face of sealing end two risers does not have respectively and housing cap (44) rectangle contiguous block keyway (46) is equipped, its outside has the male half coupling that cooperates with housing cap (44);

Rectangle contiguous block that said housing cap (44) has connection end plate (47), match with the internal orifice of frame body (40) and the inner stopper equipped mutually with the male half coupling of frame body (40) have the keyway (46) equipped with frame body (40) two riser keyways (43) on the relative two sides of said rectangle contiguous block.

14. two roller vertical mills according to claim 13; It is characterized in that: the keyway (43) of said frame body (40) is shaped as the right angled triangle keyway, and the keyway (46) of said housing cap (44) is shaped as the special-shaped keyway of a right angled triangle and " T " font combination;

The keyway (43) of perhaps said frame body (40) is divided into three sections (43a, 43b, 43c) at length direction, and the shape of two ends section (43a, 43c) is identical, is the right angled triangle keyway, and the keyway of its interlude (43b) is holding tank (43b).

15. two roller vertical mills according to claim 13, it is characterized in that: said retaining mechanism comprises: be installed in feather key (42) in the keyway of housing cap (44) and frame body (40), control the hydraulic cylinder (41) of this feather key (42) displacement and compress hydraulic cylinder (45) with being installed in outside the housing cap (44);

The said piston rod that compresses hydraulic cylinder (45) passes housing cap (44) and connects end plate (47), is resisted against the end of frame body (40); The hydraulic cylinder seat (50) of said displacement hydraulic cylinder (41) is installed on the upper surface of said housing cap (44) rectangle contiguous block, and its piston rod is connected with the upper end of feather key (42).

16. two roller vertical mills according to claim 15 is characterized in that: said feather key (42) comprises the joint (48) of cuboid and the guide head (49) of connected " T " font;

Perhaps said feather key (42) is divided into three sections (42a, 42b, 42c) at length direction; The shape of two ends section (42a, 42c) is identical; Comprise the joint (48) of cuboid and the guide head (49) of connected " T " font; The joint (48) of its interlude (42b) be shaped as right angled triangle, guide head (49) is " T " font; The length of two ends section (42a, 42c) is all less than 1/3 of feather key total length.

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