CN113182360A - Short stress path rolling mill pull rod thread clearance eliminating device and using method - Google Patents
Short stress path rolling mill pull rod thread clearance eliminating device and using method Download PDFInfo
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- CN113182360A CN113182360A CN202110529835.6A CN202110529835A CN113182360A CN 113182360 A CN113182360 A CN 113182360A CN 202110529835 A CN202110529835 A CN 202110529835A CN 113182360 A CN113182360 A CN 113182360A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/16—Adjusting or positioning rolls
- B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
- B21B31/22—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal
- B21B31/24—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal by screws
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Abstract
The invention provides a short stress path rolling mill pull rod thread clearance eliminating device and a using method thereof. The invention comprises an adjusting nut, a pressing nut, an end cover, a bearing seat, a pull rod, an elastomer cushion pad, a spherical pad and a bolt; the circumference direction outside the screw down nut and the circumference direction outside the adjusting nut are both provided with a plurality of rectangular grooves which are uniformly distributed, and the bolt inserted into the rectangular grooves is transversely arranged, so that the relative rotation between the screw down nut and the adjusting nut can be avoided. Through setting up the elastomer blotter, through the face contact, can not produce the uneven phenomenon of height after similar dish spring group became invalid, the lifting surface is bigger, and the atress is also more even. The invention is used in the roll gap adjusting device of the short stress path rolling mill for deformed steel, bar and wire materials and the like, and can conveniently and reliably eliminate the thread clearance between the pull rod and the screw down nut and the adjusting nut.
Description
Technical Field
The invention relates to the technical field of rolling mills, in particular to a device for eliminating a thread clearance between a pull rod and a nut in a short-stress-path rolling mill roll gap adjusting device and a using method thereof.
Background
The short stress path rolling mill is commonly used in the rolling field of deformed steel, bar and wire rods and the like, four pull rods of the short stress path rolling mill are provided with left and right rotating external threads, a pressing nut is configured on each pull rod, and the pressing nut is provided with corresponding rotating internal threads matched with the pull rods. The bearing seat for supporting the roller is arranged on the pressing nut, when the roller gap is adjusted, the pull rod is driven to rotate through the driving device, the pull rod and the pressing nut form a screw rod structure, the rotation of the pull rod is converted into the up-and-down movement of the pressing nut in the vertical direction of the pull rod, and then the bearing seat is driven to move up and down, and finally the adjustment of the roller gap of the rolling mill is completed. The pull rod thread and the pressing nut have a gap during transmission, so that the upper working roll can bounce during rolling, the rolling stability is influenced, and the rolling precision is reduced.
Application No. CN201620924874.0 discloses a thread backlash eliminating device, which has the following problems in practical use: the connecting pin vertically penetrates through the adjusting nut and the pressing nut, and when in maintenance, all the disc spring pins and the connecting pins on the whole annular end surface need to be taken out, and then subsequent adjustment work can be carried out; after the adjustment work is finished, the disc spring pin and the connecting pin need to be sequentially installed back, the maintenance process is complicated, and the adjustment difficulty is high.
Application number CN201120223945.1 discloses a roll seam adjusting device, dish spring group cover on the pull rod, when certain dish spring in the dish spring group damages, need to hang away the back with the screwdown gear of top is whole, just can change the dish spring, and the change is wasted time and energy.
Therefore, it is desirable to develop a thread clearance elimination device for a pull rod to solve the above problems.
Disclosure of Invention
In view of the above-mentioned technical problems, a short stress path rolling mill pull rod thread clearance eliminating device and a using method thereof are provided. The invention can be used for eliminating the thread clearance between the pull rod and the nut (pressing the nut and adjusting the nut) so as to solve the problems that the disc spring is not uniformly stressed and is easy to damage, the equipment adjusting precision is low, the adjusting difficulty is large, the mounting and dismounting efficiency is low and the like in the prior art. The technical means adopted by the invention are as follows:
a short stress path rolling mill pull rod thread clearance eliminating device comprises an adjusting nut, a pressing nut, an end cover, a bearing seat, a pull rod, an elastomer cushion pad, a spherical pad and a bolt;
the pull rod penetrates through a hole in the bearing seat, a pressing nut and an adjusting nut are arranged between the hole in the bearing seat and the pull rod in the radial direction of the pull rod along the axial direction of the pull rod, the pressing nut and the adjusting nut are matched on an external thread of the pull rod through internal threads, a certain gap is formed between the pressing nut and the adjusting nut and the hole in the bearing seat, the adjusting nut is arranged at the upper part of the pressing nut, a certain gap is formed between the pressing nut and the adjusting nut, and a spherical pad sleeved on the pull rod is arranged below the pressing nut;
a plurality of rectangle recess I of screwdown nut outside circumferencial direction evenly distributed, a plurality of rectangle recess II of adjusting nut outside circumferencial direction evenly distributed, the bolt head is equipped with the flat head of rectangle, and the width of the flat head of rectangle is B0, and the width of rectangle recess I is B2, and the width of rectangle recess II is B1, needs to satisfy B1 ═ B2 > B0. The length of the rectangular flat head is L0, the length of the rectangular groove I is L2, the length of the rectangular groove II is L1, and the requirements that L0 is more than L1, L0 is more than L2, and L0 is more than L1+ L2 are met. The bolt is transversely inserted into a hole on the side surface of the bearing seat, a rectangular flat head at the head of the bolt needs to be ensured to be simultaneously inserted into a rectangular groove I of the pressing nut and a rectangular groove II of the adjusting nut, and a fixing device is arranged at the tail of the bolt;
the end cover passes through the pull rod and then is installed on the bearing seat, a high-elastomer cushion pad sleeved on the pull rod is arranged above the adjusting nut, and the high-elastomer cushion pad is of a semi-split structure.
The top of adjusting nut and the below edge of end cover are equipped with circular arch I and protruding II respectively, and the elastomer cushion is compressed in protruding I and protruding II inboards, and the two is used for playing limiting displacement to the elastomer cushion, guarantees that the skew can not be controlled after the elastomer cushion atress.
Furthermore, the tail part of the bolt is provided with a check ring for positioning and clamping the bolt, the bolt can not be popped out from a hole on the side surface of the bearing seat, the rectangular flat head at the head part of the bolt is ensured to be always positioned in the rectangular groove I of the pressing nut and the rectangular groove II of the adjusting nut, the fixing device comprises a bolt screwed in at the tail part of the bolt, a gasket is arranged between the bolt and the bearing seat, and the bolt compresses the gasket to enable one side of the gasket to be tightly attached to the bearing seat.
Furthermore, the joint surfaces of the bolt and the gasket and the joint surfaces of the gasket and the bearing seat are required to be sealed.
Furthermore, the pressing nut is matched with the spherical pad through a concave-convex spherical surface.
And the lower part of the dust cover is fixed on the upper end surface of the end cover through a bolt and a pressing plate.
Furthermore, the bearing frame side still is equipped with the oil filler point, the oil filler point links to each other with the oilhole of sphere pad, the screw-down nut is equipped with the oilhole, and the oilhole of screw-down nut links to each other with the oilhole of sphere pad.
The invention also discloses an assembly method of the short stress path rolling mill pull rod thread clearance eliminating device, which comprises the following steps:
and 4, inserting a bolt into a hole in the side face of the bearing seat, simultaneously inserting the rectangular flat head of the bolt into the rectangular groove I of the pressing nut and the rectangular groove II of the adjusting nut, installing a check ring to clamp the bolt to position the bolt, and tightly pressing the gasket by using a bolt to perform sealing treatment.
Further, when readjustment or maintenance is needed, the method also comprises the following steps:
and (4) detaching the end cover after sequentially detaching the fasteners arranged on the side holes of the bearing seat, rotating the adjusting nut, readjusting to a fixed value A, and then installing and returning the detached part.
The invention has the following advantages:
1. the bolt is transversely arranged, so that relative rotation between the pressing nut and the adjusting nut can be avoided, and compared with a plurality of vertical locking pins of the existing structure, the bolt is simple in structure and convenient to mount and dismount; only one transversely arranged bolt needs to be pulled out, the fine adjustment of the adjusting nut can be realized by means of tools such as a screwdriver and the like, and the adjusting process is simpler and more convenient;
2. the pressing nut and the adjusting nut are respectively provided with a plurality of rectangular grooves in the outer side circumferential direction, and when the grooves in the outer side of the adjusting nut are aligned with the grooves in the outer side of the pressing nut, the grooves can be aligned only by rotating a small angle, so that the adjusted value A can be more accurate, and the adjusting precision is improved;
3. the high-elastic cushion has good damping and buffering performance, large elastic deformation after loading, fracture resistance and fatigue resistance superior to those of a disc spring, and long service life; the high-elastic cushion adopts a semi-split structure, so that the screw-down device does not need to be lifted away when the high-elastic cushion is replaced, and the installation, the disassembly and the maintenance are convenient; the high-elastic cushion pad is in surface contact with the end cover and the adjusting nut, so that the stress area is larger, the stress is more uniform, and the phenomenon of unevenness after the disc spring group fails is avoided;
4. the upper end face of the end cover is of a flat structure type, and does not need to be processed into a step shape and matched with corresponding number of pin holes, the thickness of the end cover and the length of the pull rod are correspondingly shortened, and the input cost of equipment is saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of the thread backlash elimination apparatus of the present application.
Fig. 2 and 3 are schematic views of a conventional thread backlash eliminating apparatus, respectively.
Fig. 4 is an enlarged view at X of fig. 1.
Fig. 5 is an enlarged view at Y of fig. 1.
Fig. 6 is a schematic diagram of the thread clearance elimination of the present application.
FIG. 7 is a three-dimensional block diagram of the reduction nut and adjustment nut of the present application.
FIG. 8 is a graph of the mechanical properties of an elastomeric bumper pad.
Fig. 9 is an enlarged view at Z of fig. 4.
Fig. 10 is a cross-sectional view M-M of fig. 9.
FIG. 11 is a schematic view of a semi-split construction of an elastomeric bumper pad in accordance with an embodiment of the present invention.
In the figure: 1(1 '). disc spring set, 2. disc spring pin, 3. connecting pin, 4 (4'). adjusting nut, 5(5 '). pressing nut, 6 (6') end cover, 7. bearing seat, 8. oil cup, 9(9 ', 9'). pull rod, 10. screw, 11. elastomer buffer, 12. spherical pad, 13. bolt, 14. retainer ring, 15. washer, 16. bolt I, 17. O-ring, 18. dust cover, 19. bolt II, 20. pressure plate, 401. protrusion I, 402. rectangular groove II, 501. rectangular groove I, 601, protrusion II, 701. hole I, 702. hole II, 1301. rectangular flat head.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Comparative example 1
The structure of a thread gap eliminating device in the prior art is shown in fig. 2, in the technology, a plurality of pairs of disc spring groups 1 form a balance element to eliminate thread gaps, the disc spring groups 1 are sleeved on disc spring pins 2, the disc spring pins 2 are installed in threaded holes of adjusting nuts 4 ', and connecting pins 3 penetrate through pressing nuts 5 ' and adjusting nuts 4 ', so that relative rotation between the pressing nuts 5 ' and the adjusting nuts 4 ' is guaranteed. At the same time, the upper part of the connecting pin 3 is also positioned in the hole of the end cover 6 ', when the pull rod 9 ' rotates, the relative rotation between the pressing nut 5 ' and the adjusting nut 4 ' and the pull rod 9 ' is ensured.
In practical use, the following problems exist:
(1) the connecting pin 3 vertically penetrates through the adjusting nut 4 'and the pressing nut 5', and when in maintenance, all the disc spring pins 2 and the connecting pins 3 on the whole annular end surface need to be taken out, and then subsequent adjustment work can be carried out; after the adjustment is completed, the disc spring pin 2 and the connecting pin 3 need to be installed again in sequence, the maintenance process is complicated, and the adjustment difficulty is high.
(2) The connecting pin 3 vertically penetrates into the holes of the pressing nut 5 'and the adjusting nut 4', the adjusting nut 4 'needs to be rotated during assembly, the hole on the connecting pin is ensured to be aligned with the hole of the pressing nut 5', the number of the arranged holes is limited due to the limitation of the structure and the aperture, the adjusting nut 4 'needs to rotate a larger angle during assembly, the hole on the connecting pin can be aligned with the hole of the pressing nut 5', the adjustment requirement is high, and the accuracy is poor.
(3) Damage to one disc spring of the single disc spring group 1 can affect the overall stress of the balance element, and further affect the thread clearance elimination effect; and each group of disc spring groups 1 are formed by stacking a plurality of disc springs, so that the mounting and replacing workload is large, and the mounting and dismounting efficiency is low.
(4) The end cover 6 'is of a step-shaped structure, a plurality of pin holes need to be machined in the end cover 6' to match and assemble the disc spring pin 2 and the connecting pin 3, the structure is complex, and the machining process is complicated; the end cover 6' is of a step-shaped structure, the thickness is required to be larger, the length of a corresponding pull rod is increased, and the investment of equipment cost is increased.
Comparative example 2
The structure of the roll gap adjusting device for rolling mill in the prior art is shown in fig. 3, and the thread gap is eliminated by using a pair of disc spring sets 1 'as balance elements, and the disc spring sets 1' are sleeved on the pull rod 9 ″, which has the following problems in practical use:
the dish spring group 1' is overlapped on pull rod 9 ", when certain dish spring in the dish spring group damages, need to hang the back with the screw-down device whole of top, just can change the dish spring, and the change is wasted time and energy.
Example 1
As shown in FIG. 1, the short-stress-path rolling mill pull rod thread clearance eliminating device in the application is composed of an adjusting nut 4, a pressing nut 5, an end cover 6, a bearing seat 7, an oil cup 8, a pull rod 9, a screw 10, an elastomer cushion pad 11, a spherical pad 12, a bolt 13, a retainer ring 14, a washer 15, a first bolt 16, an O-shaped ring 17, a dust cover 18, a second bolt 19, a pressure plate 20 and the like.
Specifically, the pull rod 9 penetrates through a hole I701 in the bearing seat 7, the spherical pad 12 is sleeved on the pull rod 9, a certain gap exists between the spherical pad and the pull rod 9, and the lower plane of the spherical pad 12 is in contact with the step surface of the inner hole I701 of the bearing seat 7; a pressing nut 5 and an adjusting nut 4 are arranged between a hole I701 in the bearing seat 7 and the pull rod 9 in the radial direction along the axial direction, the pressing nut 5 and the adjusting nut 4 are matched on the external thread of the pull rod 9 through internal threads, a certain gap is formed between the pressing nut 5 and the adjusting nut 4 and the hole I701 in the bearing seat 7, the adjusting nut 4 is arranged on the upper portion of the pressing nut 5, and a certain gap is formed between the pressing nut 5 and the adjusting nut; the press nut 5 is located above the spherical pad 12 and the two are matched through a fine-machined concave-convex spherical surface. The adjustment angle of the spherical surface matching is more flexible, so that the bearing seat 7 can meet the requirement of rolling force, and the rigidity and the rolling precision of the rolling mill can be improved.
As shown in fig. 7, a plurality of rectangular grooves i 501 are uniformly distributed in the outer circumferential direction of the pressing nut 5, and a plurality of rectangular grooves ii 402 are uniformly distributed in the outer circumferential direction of the adjusting nut 4. As shown in fig. 9 and 10, the head of the plug 13 is provided with a rectangular flat head 1301, the width of the rectangular flat head 1301 is B0, the width of the rectangular groove i 501 is B2, and the width of the rectangular groove ii 402 is B1, which satisfies B1-B2 > B0. The length of the rectangular flat head 1301 is L0, the length of the rectangular groove I501 is L2, the length of the rectangular groove II 402 is L1, and L0 is more than L1, L0 is more than L2, and L0 is more than L1+ L2. As shown in fig. 4, the plug 13 is transversely inserted into the hole ii 702 on the side surface of the bearing seat 7, and the rectangular flat head 1301 at the head portion of the plug needs to be simultaneously inserted into the rectangular groove i 501 of the pressing nut 5 and the rectangular groove ii 402 of the adjusting nut 4, so as to limit the pressing nut 5 and the adjusting nut 4 and prevent the pressing nut 5 and the adjusting nut 4 from rotating relatively. Because the bolt 13 is fixed in the hole II 702 on the side surface of the bearing seat 7, when the pull rod 9 rotates, the relative rotation between the press nut 5 and the adjusting nut 4 and the pull rod 9 can be avoided, and only the vertical up-and-down movement along with the bearing seat 7 can be realized. The two functions can be realized only by transversely arranging the bolt 13, the structure is simple, and the installation and the disassembly are convenient.
The upper end face of the end cover 6 is of a flat structure type, the pull rod 9 integrally penetrates through the upper end face, the outer diameter of a lower boss of the end cover 6 is matched with the top of a hole I701 in the bearing seat 7, a matching surface is sealed by an O-shaped ring 17, and the end cover 6 is fixed to the top of the bearing seat 7 through a screw 10; the high-elasticity buffer cushion 11 is sleeved on the pull rod 9 and compressed between the end cover 6 and the adjusting nut 4 under the action of a pre-tightening force of the end cover 6, the high-elasticity buffer cushion 11 generates elasticity between the end cover 6 and the adjusting nut 4 after being compressed, and the elasticity can drive the end cover 6, the bearing seat 7 and parts (including the pressing nut 5, the spherical cushion 12 and the like) connected with the bearing seat 7 to move upwards.
In this embodiment, an elastomeric bumper pad 11 is used as the balancing member. The high-elastic cushion pad 11 is processed by tempered polyurethane rubber, can bear large impact force, has good shock absorption and buffering performance, better fracture resistance and fatigue resistance than a disc spring, long service life and very convenient installation, disassembly and maintenance. The mechanical property curve of the elastomer cushion 11 is shown in FIG. 8. As shown in fig. 11, the high-elasticity buffer pad 11 of the present embodiment is a semi-split type, so that when the high-elasticity buffer pad 11 is damaged and needs to be replaced, a new semi-split type high-elasticity buffer pad 11 can be directly installed on the pull rod 9 without integrally removing and lifting the pressing device above the pull rod 9. The structure can reduce the disassembly and assembly difficulty and save the disassembly and assembly time.
In a preferred embodiment, the upper side of the adjusting nut 4 and the lower edge of the end cap 6 are provided with a circular protrusion i 401 and a protrusion ii 601, respectively, and the elastomer cushion 11 is compressed inside the protrusions i 401 and ii 601. The bulges I401 and the bulges II 601 play a role in limiting the high-elastic cushion pad 11 in the rolling process, and ensure that the high-elastic cushion pad 11 cannot deflect left and right after being stressed. As shown in fig. 5.
In a preferred embodiment, a retainer ring 14 is arranged at the tail part of the bolt 13 to position and clamp the bolt 13, so that the bolt 13 cannot be ejected out of the hole II 702, and the rectangular flat head 1301 at the head part is always positioned in the rectangular groove I501 of the pressing nut 5 and the rectangular groove II 402 of the adjusting nut 4. The end of the bolt 13 is screwed into the first bolt 16, and the first bolt 16 presses the washer 15, so that one side of the washer 15 is tightly attached to the bearing seat 7. Sealant is required to be coated on the joint surface of the first bolt 16 and the gasket 15 and the joint surface K of the gasket 15 and the bearing seat 7, so that dust is prevented from entering the hole I701 in the bearing seat 7 from the joint surface, threaded matching of the pressing nut 5 and the adjusting nut 4 with the pull rod 9 is guaranteed, and lubricating grease is prevented from overflowing from the joint surface.
The dust cover 18 is sleeved on the pull rod 9, and the lower part of the dust cover 18 is fixed on the upper end face of the end cover 6 through a second bolt 19 and a pressing plate 20. The dust cover 18 forms a closed space, so that external dust, impurities and the like are prevented from entering, and the service performance of the equipment is ensured.
The bearing frame side still is equipped with the oil filler point, the oil filler point links to each other with the oilhole of sphere pad, the screw-down nut is equipped with the oilhole, and the oilhole of screw-down nut links to each other with the oilhole of sphere pad. The drier oil can be injected through the oil cup 8 in the application, the drier oil is injected through the oil hole of the spherical pad 12, the oil hole of the pressing nut 5 penetrates through the inner thread of the oil hole, and the spherical matching position of the pressing nut 5 and the spherical pad 12 and the thread matching position of the pressing nut 5, the adjusting nut 4 and the pull rod 9 are lubricated.
The invention also discloses an assembly method of the short stress path rolling mill pull rod thread clearance eliminating device, which comprises the following steps:
And 3, placing an elastomer cushion pad 11 on the upper end face of the adjusting nut 4, adjusting the position, then installing the end cover 6 on the bearing seat 7, pre-tightening the end cover by using a screw 10, and compressing the elastomer cushion pad 11 to generate elastic force between the end cover 6 and the adjusting nut 4.
And 4, inserting the bolt 13 into a hole II 702 on the side surface of the bearing seat 7, so that the rectangular flat head 1301 at the head part of the bolt 13 is simultaneously inserted into the rectangular groove I501 of the pressing nut 5 and the rectangular groove II 402 of the adjusting nut 4 (the pressing nut 5 and the adjusting nut 4 are ensured not to rotate relatively, and the pressing nut 5, the adjusting nut 4 and the pull rod 9 are ensured not to rotate relatively). A retainer ring 14 is installed to hold the latch 13 in place, a bolt 16 is used to compress a washer 15, and then sealant is applied at "K".
The principle of eliminating the thread clearance of the invention is as follows:
during installation of the end cap 6 in the bearing seat 7, the elastomer cushion 11 is gradually compressed, creating a spring force between the end cap 6 and the adjustment nut 4. At the moment, the adjusting nut 4 is acted by the pre-tightening force of the end cover 6, the internal thread of the adjusting nut 4 moves downwards to press the external thread of the pull rod 9, and the thread clearance between the adjusting nut 4 and the pull rod 9 is eliminated.
The elasticity that compression elastomer blotter 11 produced can reverse drive end cover 6, bearing frame 7 rebound, and then drives the part (including screwdown nut 5, sphere pad 12 etc.) of being connected with bearing frame 7 rebound, makes screwdown nut 5's internal thread upward movement, compresses tightly the external screw thread of pull rod 9, has eliminated the thread clearance between screwdown nut 5 and the pull rod 9.
I.e. the method of thread clearance elimination, involves two forces: one is the pretightening force of the end cover 6, so that the internal thread of the adjusting nut 4 moves downwards, and the thread clearance between the adjusting nut 4 and the pull rod 9 is eliminated. The other is the elastic force generated by compressing the elastomer cushion 11, so that the internal thread of the pressing nut 5 moves upwards, and the thread gap between the pressing nut 5 and the pull rod 9 is eliminated.
The bearing seat 7, the adjusting nut 4, the pressing nut 5 and the pull rod 9 are taken as a whole, and stress balance is researched: the acting force between the adjusting nut 4 and the pull rod 9 is F1, the acting force between the pressing nut 5 and the pull rod 9 is F2, and the two acting forces F1 and F2 are equal in magnitude and opposite in direction.
In the rolling process, when the bearing seat 7 bears upward load, no gap exists in the bearing seat 7, the integral rigidity is high, the shaking phenomenon cannot occur, the rolling mill has small bounce, and the rolling process is stable. Thereby improving the rolling precision and prolonging the service life of related parts.
The method and principle of the whole thread clearance elimination is shown in fig. 6.
In the use process of the equipment, due to assembly errors or other reasons, the phenomenon that the rolling mill bounces over a large scale can occur, and at the moment, the thread clearance eliminating device of the application needs to be readjusted. The process is briefly described as follows:
1. preparation work: the upper working roll is lifted up and positioned by a cushion block;
2. disassembling the fastener: sequentially detaching the first bolt 16, the washer 15, the retainer ring 14 and the bolt 13;
3. and (3) disassembling an end cover: loosening the screw 10 and opening the end cover 6;
4. adjusting the value of 'A': by means of a screwdriver and other tools, the rectangular groove II 402 of the adjusting nut 4 is shifted through the hole II 702 in the side face of the bearing seat 7, the adjusting nut 4 is finely adjusted, the distance from the upper end face of the adjusting nut to the contact face of the end cover 6 and the bearing seat 7 is ensured, the adjusting nut is adjusted to a fixed value A again, and the fixed value A can be measured by a vernier caliper.
5. Installing a fastener: sequentially installing a bolt 13, a retainer ring 14, a washer 15 and a first bolt 16;
6. installing an end cover: installing an end cover 6, and tightening a screw 10;
7. ending work: and removing the cushion block, and falling back and resetting the upper working roll.
The elastomeric cushions 11 can also be replaced by the same method as described above when they are damaged or have substandard properties.
Readjust and when overhauing, only need extract bolt 13, open end cover 6, just can carry out rotation regulation to adjusting nut 4, need all take out back with every dish spring round pin 2 and connecting pin 3 for current structure, just can rotate adjusting nut 4, the operating method who adjusts and overhauls work is reappeared in this application is simple and convenient, and the adjustment is efficient.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A short stress path rolling mill pull rod thread clearance eliminating device is characterized by comprising an adjusting nut, a pressing nut, an end cover, a bearing seat, a pull rod, an elastomer cushion pad, a spherical pad and a bolt;
the pull rod penetrates through a hole in the bearing seat, a pressing nut and an adjusting nut are arranged between the hole in the bearing seat and the pull rod in the radial direction of the pull rod along the axial direction of the pull rod, the pressing nut and the adjusting nut are matched on an external thread of the pull rod through internal threads, a certain gap is formed between the pressing nut and the adjusting nut and the hole in the bearing seat, the adjusting nut is arranged at the upper part of the pressing nut, a certain gap is formed between the pressing nut and the adjusting nut, and a spherical pad sleeved on the pull rod is arranged below the pressing nut;
the bolt head part is provided with a rectangular flat head, the width of the rectangular flat head is B0, the width of the rectangular groove I is B2, the width of the rectangular groove II is B1, the requirement that B1 is B2 and B0, the length of the rectangular flat head is L0, the length of the rectangular groove I is L2, the length of the rectangular groove II is L1, the requirement that L0 is L1, L0 and L2 are L0 and L1+ L2 are met, the bolt is transversely inserted into a hole in the side face of a bearing seat, the rectangular flat head of the head part of the bolt is required to be simultaneously inserted into the rectangular groove I of the pressing nut and the rectangular groove II of the adjusting nut, and the bolt tail part is provided with a fixing device;
the end cover penetrates through the pull rod and then is installed on the bearing seat, an elastomer cushion pad sleeved on the pull rod is arranged above the adjusting nut, and the elastomer cushion pad is of a semi-split structure type;
the top of adjusting nut and the below edge of end cover are equipped with circular arch I and protruding II respectively, and the elastomer cushion is compressed in protruding I and protruding II inboards, and the two is used for playing limiting displacement to the elastomer cushion, guarantees that the skew can not be controlled after the elastomer cushion atress.
2. The short stress path rolling mill pull rod thread clearance elimination device of claim 1, wherein the bolt tail portion is provided with a retaining ring for positioning and clamping the bolt, the retaining ring can enable the bolt not to pop out from a hole in the side face of the bearing seat, a rectangular flat head at the head portion of the bolt is guaranteed to be always located in a rectangular groove I of the pressing nut and a rectangular groove II of the adjusting nut, the fixing device comprises a bolt screwed in the bolt tail portion, a gasket is arranged between the bolt and the bearing seat, and the bolt compresses the gasket to enable one side of the gasket to be tightly attached to the bearing seat.
3. The short stress path rolling mill pull rod thread clearance elimination device of claim 1, wherein the joint surface of the bolt and the gasket and the joint surface of the gasket and the bearing seat are sealed.
4. The short stress path rolling mill pull rod thread clearance elimination device of claim 1, wherein the press nut and the spherical pad are matched through a concave-convex spherical surface.
5. The short stress path rolling mill pull rod thread clearance elimination device of claim 1, further comprising a dust cover, wherein the dust cover is sleeved on the pull rod, and the lower portion of the dust cover is fixed on the upper end face of the end cover through a bolt and a pressing plate.
6. The short stress path rolling mill pull rod thread clearance elimination device of claim 1, wherein an oil injection hole is further formed in a side surface of the bearing seat, the oil injection hole is connected with the oil hole of the spherical pad, the screw-down nut is provided with an oil hole, and the oil hole of the screw-down nut is connected with the oil hole of the spherical pad.
7. The assembling method of the short stress path rolling mill pull rod thread clearance eliminating device according to any one of claims 1 to 6, comprising the following steps:
step 1, before assembly, coating proper amount of dry oil on the screw thread positions of a pressing nut, an adjusting nut and a pull rod, and the concave spherical surface position of the pressing nut and the convex spherical surface position of a spherical pad;
step 2, a spherical pad and a pull rod are installed in the bearing seat, then a pressing nut penetrates into the pull rod, and the pressing nut is rotated to enable the concave spherical surface of the pressing nut to be in contact with the convex spherical surface of the spherical pad; penetrating an adjusting nut into a pull rod, rotating the adjusting nut to enable the upper end face of the adjusting nut to reach the contact surface of the end cover and the bearing seat, enabling the distance between the upper end face of the adjusting nut and the contact surface of the end cover and the bearing seat to be a fixed value A, poking a rectangular groove I of a pressing nut and a rectangular groove II of the adjusting nut through a hole II in the side surface of the bearing seat, and finely adjusting the pressing nut and the adjusting nut;
step 3, placing an elastomer cushion pad on the upper end face of the adjusting nut, adjusting the position, installing an end cover on a bearing seat, and pre-tightening the end cover through a screw;
and 4, inserting a bolt into a hole in the side face of the bearing seat, simultaneously inserting the rectangular flat head of the bolt into the rectangular groove I of the pressing nut and the rectangular groove II of the adjusting nut, installing a check ring to clamp the bolt to position the bolt, and tightly pressing the gasket by using a bolt to perform sealing treatment.
8. The method of assembling of claim 7, further comprising the steps of, when readjustment or service is required:
and (4) detaching the end cover after sequentially detaching the fasteners arranged on the side holes of the bearing seat, rotating the adjusting nut, readjusting to a fixed value A, and then installing and returning the detached part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110529835.6A CN113182360B (en) | 2021-05-14 | 2021-05-14 | Device for eliminating screw thread clearance of pull rod of short stress line rolling mill and using method |
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| CN202110529835.6A CN113182360B (en) | 2021-05-14 | 2021-05-14 | Device for eliminating screw thread clearance of pull rod of short stress line rolling mill and using method |
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| CN107138534A (en) * | 2017-06-30 | 2017-09-08 | 马鞍山市银鼎机械制造有限公司 | A kind of removing method of short stress path rolling mill and its thread pitch |
| GB202004313D0 (en) * | 2019-03-26 | 2020-05-06 | Univ Shijiazhuang Tiedao | Steel pin capable of eliminating installation clearence |
| CN215032335U (en) * | 2021-05-14 | 2021-12-07 | 大连华锐重工集团股份有限公司 | Short stress path rolling mill pull rod thread clearance eliminating device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB743267A (en) * | 1952-05-31 | 1956-01-11 | Northrop Aircraft Inc | Improvements in or relating to anti-backlash bolt assemblies |
| RU2185906C2 (en) * | 2000-02-21 | 2002-07-27 | Сафронов Виктор Иванович | Locking device for screw of screw-down mechanism of cogging mill |
| CN104889156A (en) * | 2015-06-03 | 2015-09-09 | 中冶华天南京工程技术有限公司 | Bars reducing and sizing mill |
| CN206054708U (en) * | 2016-08-31 | 2017-03-29 | 威海华陆数控机床有限公司 | The double straight-tooth gear backlash eliminating equipments of single shaft |
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| CN113182360B (en) | 2023-09-26 |
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