CN203711480U

CN203711480U - Pre-stress mill

Info

Publication number: CN203711480U
Application number: CN201420113921.4U
Authority: CN
Inventors: 荣崎; 李图学; 郭显平; 牛强
Original assignee: CISDI Engineering Co Ltd
Current assignee: CISDI Engineering Co Ltd
Priority date: 2014-03-13
Filing date: 2014-03-13
Publication date: 2014-07-16
Anticipated expiration: 2024-03-13

Abstract

The utility model discloses a pre-stress mill. The mill comprises a rack, an upper roller and a lower roller which are arranged in the middle of the rack, upper bearing block and lower bearing blocks which are arranged at the two ends of the upper roller and the lower roller, an upper pre-tightening hydraulic cylinder and a lower pre-tightening hydraulic cylinder which are fixed on the rack and connected with the upper bearing block and the lower bearing blocks correspondingly and a roller gap adjusting unit. The roller gap adjusting unit comprises lead screws, upper nuts and lower nuts which are sleeved on the lead screws and compression units for driving the lead screws to rotate. The upper nuts are embedded in the upper bearing blocks, the lower nuts are embedded in the lower bearing blocks, and the turning directions of threads in the upper nuts and the lower nuts are opposite. Pre-stress is imposed through the hydraulic cylinders, the roller gap symmetrical adjustment is achieved through the lead screws, the roller gaps can be opened rapidly, the pre-stress can be adjusted according to rolling conditions, the mill automation degree is improved, the worker labor amount is reduced, and the rolling efficiency is improved effectively.

Description

Prestressed rolling mill

Technical field

The utility model belongs to metal shaping equipment field, relates to a kind of prestressed rolling mill.

Background technology

Prestressed rolling mill is exactly to make milling train milling train in stress just before rolling, and apply prestressing force and can eliminate or reduce the gap value between each parts in milling train, the spring causing while reducing steel rolling, thus improve workpiece measurement precision.

Current prestressed rolling mill mainly contains three kinds of versions: (1) eccentric bushing cartridge type, adjust roll gap with worm-drive eccentric bushing; (2) hollow draw-bar formula, applies short stress by filling hydraulic oil in hollow draw-bar; (3) half racks, couple together upper second frame with pull bar.

In above-mentioned three kinds of milling trains, mainly there is the inconstant problem of rolling centerline in eccentric bushing cartridge type and half rack, while adjustment due to roll gap, only can adjust separately topping roll or bottom roll, the rolling roll gap that makes milling train is compared to the center line change of other equipment on same production line, thereby cause rolled piece and import the problems such as difficulty and fluctuation of service, simultaneously, pre existing stress rolling mill main will apply prestressing force by hydraulic nut or hydraulic jack, degree of regulation is poor, is difficult to realize rapid adjustment according to rolling operating mode; Although hollow draw-bar formula milling train has structurally improved above-mentioned defect, but it belongs to without memorial archway formula milling train, line of tension is to be sub-circular along the direction of bearing block substantially, so in the operation of rolling, the roll-force being produced by roll torque reaches roll bearing by roll, and then reach the screw mandrel that roll bearing is installed, when mill load is larger, can tear problem, thereby be only applicable to the rolling of small section and wire rod, the scope of application is narrower.

Summary of the invention

In view of this, the purpose of this utility model be to provide a kind of can be according to rolling operating mode rapid adjustment prestressing force size, and the symmetrical stiff mill that regulates roll gap size fast.

For achieving the above object, the utility model provides following technical scheme: a kind of prestressed rolling mill, comprise frame, be arranged on topping roll and bottom roll between frame, be arranged on top chock and the step at topping roll and bottom roll two ends, be fixed in frame and with upper, corresponding upper pretension hydraulic cylinder and the lower pretension hydraulic cylinder connecting of step, also comprise roll-separating mechanism, described roll-separating mechanism comprises the screw mandrel with step and together with connecting through top chock, the screwdown gear that is sleeved on top nut on screw mandrel and lower nut and drives screw mandrel to rotate, described top nut is inlaid on top chock, described lower nut is inlaid on step, described top nut is contrary with the thread rotary orientation in lower nut.

Further, between described upper and lower pretension hydraulic cylinder and upper and lower bearing block, be equipped with convex surface pad or concave surface pad.

Further, between described upper and lower bearing block and upper and lower nut, be equipped with ball ring.

The beneficial effects of the utility model are: overall structure is simple, compact, be easy to manufacture, and the scope of can rolling is large, and reliability is high; Adopt hydraulic cylinder to apply prestressing force, screw mandrel is realized the symmetrical adjustment of roll gap, compared with existing prestressed rolling mill, can open fast roll gap, can, according to rolling Operating condition adjustment prestressing force, improve the automaticity of milling train, alleviate workman's the amount of labour, reduce the processing time of piling steel in the operation of rolling simultaneously, effectively improved rolling efficiency.

Brief description of the drawings

In order to make the purpose of this utility model, technical scheme and beneficial effect clearer, the utility model provides following accompanying drawing to describe:

Fig. 1 is structural representation of the present utility model;

Fig. 2 is the A-A cutaway view of Fig. 1.

Detailed description of the invention

Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail.

As Fig. 1, shown in Fig. 2, prestressed rolling mill described in the present embodiment comprises frame 1, be arranged on the topping roll 2 and bottom roll 3 of 1 of frame, be arranged on the top chock 4 and step 5 at topping roll 2 and bottom roll 3 two ends, be fixed in frame 1 and with top chock 4, corresponding upper pretension hydraulic cylinder 6 and the lower pretension hydraulic cylinder 7 connecting of step 5, also comprise roll-separating mechanism, described roll-separating mechanism comprises through top chock 4 and step 5 screw mandrel 8 that metal (upper seat is linked together, the screwdown gear 9 that is sleeved on top nut on screw mandrel 8 81 and lower nut 82 and drives screw mandrel 8 to rotate, described top nut 81 is inlaid on top chock 4, described lower nut 82 is inlaid on step 5, described top nut 81 is contrary with the thread rotary orientation in lower nut 82.

In the present embodiment, as shown in Figure 2, upper pretension hydraulic cylinder 6 is fixed on the entablature 11 of frame 1 and is connected with top chock 4, lower pretension hydraulic cylinder 7 is fixed on the sill 12 of frame 1 and is connected with step 5, screw mandrel 8 links together top chock 4 and step 5 through entablature 11, on screw mandrel 8, correspondence is set with top nut 81 and lower nut 82 simultaneously, go up herein, lower nut 81, 82 correspondences are embedded in, step 4, on 5, ensure not produce relative rotation between nut and bearing block, but nut and bearing block are unfixing, still can on the axis direction of screw mandrel 8, produce and relatively move between the two.

Stressed evenly for ensureing frame 1 entirety, the screw mandrel 8 in the present embodiment is provided with four.

In the present embodiment, between the connecting portion of described upper pretension hydraulic cylinder 6, lower pretension hydraulic cylinder 7 and top chock 4, step 5, be equipped with convex surface pad 10, be used for transmitting the power between pretension hydraulic cylinder and bearing block, to alleviate or avoid the damage to pretension hydraulic cylinder or bearing block in the time that large draught pressure lower bearing bracket 1 produces distortion, convex surface pad 10 herein also can be concave surface pad.

In the present embodiment, between described top chock 4, step 5 and top nut 81, lower nut 82, be equipped with ball ring 13, the power being used between transmitter shaft bearing and screw mandrel 8, to alleviate under high-prestressed or avoid the damage to bearing.

The concrete course of action that roll gap regulates is as follows: the screwdown gear 9 of unlatching drives screw mandrel 8 to rotate, because upper and lower nut 81,82 cannot rotate on upper and lower bearing block 4,5, and the rotation direction that is jointly sleeved on top nut 81 on screw mandrel 8 and lower nut 82 is contrary, therefore upper and lower nut 81,82 carries out moving in opposite directions or oppositely along screw mandrel 8 axis; While opening roll gap, screw mandrel 8 forwards, top nut 81 is by being arranged on the ball ring 13 jack-up top chocks 4 on top chock 4, lower nut 82 presses down step 5 by the ball ring 13 being arranged on step 5, when closed roll gap, screw mandrel 8 reverses, and upper and lower pretension hydraulic cylinder 6,7 applies a less active force to upper and lower bearing block 4,5 simultaneously, upper and lower bearing block 4,5 can be relatively moved along with upper and lower nut 4,5, to ensure the invariable of rolling center; In the time that upper and lower bearing block 4,5 arrives desired location under the effect of screw mandrel 8, according to the pressure rating of the upper and lower pretension hydraulic cylinder of rolling Operating condition adjustment, and then milling train is applied to prestressing force; Because screw thread has latching characteristics, therefore in the situation that screwdown gear 9 does not drive screw mandrel 8 to rotate, top chock 4 can move upward under the effect of upper pretension hydraulic cylinder 6, and cannot move downward, step 5 can move downward under the effect of lower pretension hydraulic cylinder 7, and cannot move upward, when accurate without control roll gap, also can directly drive top chock 4 to move upward by opening upper pretension hydraulic cylinder 6, lower pretension hydraulic cylinder 7 drives step 5 to move downward, and realizes opening fast of roll gap.

The transfer route that pre-stressed state is exerted oneself is: after upper and lower bearing block 4,5 set positions are good, apply prestressing force, upper pretension hydraulic cylinder 6 cavitys are oil-filled applies a downward pretightning force to top chock 4, this pretightning force is passed to screw mandrel 8 after by ball ring 13 and top nut 81, with pretension hydraulic cylinder 7 cavitys are oil-filled at present, step 5 is applied to a pretightning force upwards, this pretightning force is passed to screw mandrel 8 after by ball ring 13 and lower nut 82, under the acting in conjunction of upper and lower pretension hydraulic cylinder 6,7, the gap of eliminating each parts; Because screw mandrel 8 is subject to the pressure from upper and lower pretension hydraulic cylinder 6,7,1 of frame now affords the reaction force from upper and lower pretension hydraulic cylinder 6,7, both frame 1 tensions, and whole stress is at the interior formation sealing of frame 1 NOL ring.

Finally explanation is, above preferred embodiment is only unrestricted in order to the technical solution of the utility model to be described, although the utility model is described in detail by above preferred embodiment, but those skilled in the art are to be understood that, can make various changes to it in the form and details, and not depart from the utility model claims limited range.

Claims

1. a prestressed rolling mill, comprise frame, be arranged on topping roll and bottom roll between frame, be arranged on, the top chock at bottom roll two ends and step, be fixed in frame and with upper, corresponding upper pretension hydraulic cylinder and the lower pretension hydraulic cylinder connecting of step, it is characterized in that: also comprise roll-separating mechanism, described roll-separating mechanism comprises the screw mandrel with step and together with connecting through top chock, the screwdown gear that is sleeved on top nut on screw mandrel and lower nut and drives screw mandrel to rotate, described top nut is inlaid on top chock, described lower nut is inlaid on step, described top nut is contrary with the thread rotary orientation in lower nut.

2. prestressed rolling mill according to claim 1, is characterized in that: between described upper and lower pretension hydraulic cylinder and upper and lower bearing block, be equipped with convex surface pad or concave surface pad.

3. prestressed rolling mill according to claim 1, is characterized in that: between described upper and lower bearing block and upper and lower nut, be equipped with ball ring.