Thread pair protection device for pressing down

Abstract

The present invention relates to a protection device for a screw pair of a screwdown, which comprises a screwdown nut, a screwdown screw, a concave spherical pair, a convex spherical pair and a spherical pair seat. The screwdown nut is used for being fixedly arranged in a housing of a rolling mill stand, and the screwdown screw is arranged through the screwdown nut. The concave spherical pair is fixedly arranged at the bottom end of the screwdown screw, the convex spherical pair is arranged below the concave spherical pair, and the convex spherical pair is arranged in the spherical pair seat. The protection device for the screw pair of the screwdown further comprises a protection support sleeve and two support sliding plates. The protection support sleeve is sleeved and pivotally connected to the outside of the concave spherical pair. Two support ribs are symmetrically arranged on the outside of the protection support sleeve, and a guide groove penetrating through the top surface and the bottom surface is formed at the outer end of the support rib. Both of the two support sliding plates are used for being fixedly arranged on the housing of the rolling mill stand, and the support sliding plates can be slidably embedded in the guide groove. The present invention can effectively reduce the bending deflection of the screwdown screw, effectively protect the screwdown nut and reduce the wear of the screwdown nut.

Description

Technical Field

[0001] The present invention relates to the technical field of the roll gap control system of rolling mills, and more particularly to a protection device for a screw pair of roll gap control. Background Art

[0002] Currently, two-high rolling mills and four-high rolling mills for hot rolling extra-thick steel plates generally adopt reversible rolling with a large opening. Due to the large opening of the rolling mill and large rolling force, high stiffness of the rolling mill and fast response of the roll gap control system are required. To meet such requirements, a screw pair drive structure is adopted for the roll gap control system.

[0003] (1) The partial equipment structure of the existing roll gap control system is as Figure 1 and Figure 2 shown, and the functions of each component are introduced as follows:

[0004] Frame housing 01: Fixed on the foundation to bear all loads; the frame housing 01 is a gantry structure composed of two columns and a top beam. The space between the two columns and the top beam forms the window of the frame housing 01. There are mounting holes on the top beam, and the screw-down nut 02 can be fixed in these mounting holes;

[0005] Screw-down nut 02: Installed in the frame housing 01, fixed in place, and bearing various loads transmitted by the screw-down screw 03;

[0006] Screw-down screw 03: Rotating in the screw-down nut 02, moving up and down, with the thread bearing the rolling force and other loads, and at the same time transmitting these loads to the screw-down nut 02;

[0007] Concave spherical pair 04: Installed at the end of the screw-down screw 03, integrated with the screw-down screw 03, and rotating together; at the same time, bearing various forces transmitted from the spherical pair seat 06;

[0008] Convex spherical pair 05: Together with the concave spherical pair 04, forming a spherical pair, allowing a certain degree of inclination;

[0009] Spherical pair seat 06: A cylindrical structure with a through hole at the top. The lower part of the concave spherical pair 04, the convex spherical pair 05, the pressure sensor 062, the uniform plate 061, etc. are assembled in the spherical pair seat 06, and the upper part of the concave spherical pair 04 passes through this through hole; the spherical pair seat 06 is placed on the bearing housing 010 of the roll 09 (not fixed between them), and moves together with the bearing housing 010;

[0010] Spherical pair seat support 07: Supported at both ends on the roll balance beam 08 to ensure that the spherical pair seat 06 is in a centered state;

[0011] Roll balance beam 08: A component of the roll balance system that hooks the bearing block 010 and drives the bearing block 010 to move up and down together with the screw down system. Specifically, the upper end of the roll balance beam 08 is connected to the corresponding hydraulic cylinder, and the hydraulic cylinder drives the roll balance beam 08 to move up and down, thereby driving the bearing block 010 to move up and down.

[0012] (2) As Figure 3 shown, there are several parts in the equipment that need to have a certain equipment clearance to ensure smooth installation and normal operation.

[0013] (1) To ensure the smooth replacement of the roll 09, there needs to be a certain clearance between the bearing block 010 of the roll 09 and the housing 01 of the rolling mill. Specifically, there is a certain clearance between the slide surface A of the housing and the slide surface B of the bearing block (i.e., the first clearance d1);

[0014] (2) When the bearing block 010 drives the roll 09 to move up and down in the window of the housing 01 of the rolling mill, there needs to be a certain clearance between the slide surface A of the housing and the slide surface B of the bearing block (i.e., the first clearance d1);

[0015] (3) When the roll balance beam 08 moves up and down in the window of the housing 01 of the rolling mill, there needs to be a certain clearance between the slide surface A of the housing and the outer slide surface C of the roll balance beam (i.e., the second clearance d2); there also needs to be a certain clearance between the inner slide surface of the roll balance beam and the end face of the spherical pair seat support 07 (i.e., the third clearance d3).

[0016] During the rolling process, the above clearances will increase, and the wear unevenness will also increase.

[0017] (3) As Figure 4 shown, the force conditions of the screw down thread pair are as follows:

[0018] Rolling force F: The rolling force, which is the huge deformation resistance generated by the plastic deformation of the rolled piece; the direction is vertically upward;

[0019] Axial force FZ: The axial force received by the roll 09, the direction is along the axis of the roll 09. Axial forces can be generated due to high rolling temperature, thermal expansion of the roll 09 axis, and skew of the rolled piece, etc.; the deformation of the roll 09 causes the bearing block 010 to tilt, driving the screw down screw 03 to be stressed and tilted;

[0020] Impact force FC: The impact force load received by the roll 09 during the steel biting and rolling process; the direction is as Figure 4 shown;

[0021] The rolling force F, axial force FZ, and impact force FC are transmitted through the roll 09 → bearing block 010 → convex spherical pair 05 → concave spherical pair 04 → screw down screw 03 → screw down nut 02 → housing 01 of the rolling mill.

[0022] (4) As Figure 5As shown in the figure, the deflection generation process of the screw-down screw 03 is as follows:

[0023] (1) There is a gap between the bearing block slide surface B and the housing slide surface A of the rolling mill stand. During the rolling process, the wear of the slide and the uneven wear cause the gap to increase. Under the combined action of the impact force FC and the axial force FZ during the rolling process, the bearing block 010 tilts (and the tilting direction is uncertain). The spherical pair is the rotation point. The spherical pair seat 06 is installed on the upper surface of the bearing block 010. The bearing block 010 drives the spherical pair seat 06 to tilt, and the tilted convex spherical pair 05 transmits the tilted load to the concave spherical pair 04;

[0024] (2) During the rolling process, the roll 09 bends and deforms, driving the bearing block 010 to tilt. The tilted bearing block 010 drives the convex spherical pair 05 to tilt accordingly, and the load transmitted to the screw-down screw 03 causes the screw-down screw 03 to bend and deform;

[0025] (3) Due to the manufacturing and installation errors of the spherical pair and the thermal expansion and contraction of the roll 09, there is a certain eccentricity between the convex spherical pair 05 and the concave spherical pair 04. Under the action of the overbalance force, the head of the screw-down screw 03 exhibits swing and vibration during rotation. The screw-down screw 03 generates deflection under the constraint of the thread pair of the screw-down nut 02, and a combined stress of bending, torsion, and compression is inevitably generated at the root; since the screw-down nut 02 is made of alloy copper and its hardness is less than that of the screw-down screw 03, the screw-down nut 02 wears severely.

[0026] (4) The screw-down screw 03 is under cantilever force. As the opening of the roll 09 increases, the longer the cantilever, the greater the bending deflection, and the greater the impact on the screw-down thread pair;

[0027] (5) During the rolling process, the impact is large, and the screw-down screw 03 under cantilever force bends more severely, having a greater impact on the screw-down nut 02.

[0028] (5) The existing technology has the following disadvantages:

[0029] Now, the screw-down nut 02 is simplified into a part with an axial guide sleeve function and a vertical support function. Then, the screw-down screw 03 becomes a cantilever beam, and its principle is as Figure 6 shown, Figure 6 The line L1 in the figure represents the theoretical axis of the screw-down screw 03, and the line L2 represents the actual axis of the screw-down screw 03.

[0030] The spherical pair seat support 07 in the existing structural design (see Figure 1)It can only support the centering of the spherical pair seat 06 and the convex spherical pair 05, but cannot support the centering of the concave spherical pair 04, and cannot solve the problem that the spherical pair seat 06 follows the inclination of the bearing seat 010, resulting in the bending deformation of the screw-down screw 03. The screw-down screw 03 generates a bending deflection, and the meshing state at the lower part of the thread pair is severely damaged, and the screw-down nut 02 is severely worn. From the actual damage situation of the existing screw-down nut 02, the lower edge of the screw-down nut 02, 1 to 4 turns, is severely worn, while the high-level thread is not worn much.

[0031] Therefore, based on the experience and practice of being engaged in the relevant industry for many years, the present inventor proposes a protection device for the screw-down thread pair to overcome the defects of the prior art. Summary of the Invention

[0032] The purpose of the present invention is to provide a protection device for the screw-down thread pair, which can effectively reduce the bending deflection of the screw-down screw, effectively protect the screw-down nut, and reduce the wear of the screw-down nut.

[0033] The purpose of the present invention is achieved in this way. A protection device for the screw-down thread pair includes a screw-down nut, a screw-down screw, a concave spherical pair, a convex spherical pair, and a spherical pair seat. The screw-down nut is used to be fixedly arranged in the frame housing. The screw-down screw is inserted through the screw-down nut. The concave spherical pair is fixedly arranged at the bottom end of the screw-down screw. The convex spherical pair is arranged below the concave spherical pair, and the convex spherical pair is arranged in the spherical pair seat. The protection device for the screw-down thread pair further includes a protection support sleeve and two support sliding plates. The protection support sleeve is sleeved and pivotally connected to the outside of the concave spherical pair. Two support ribs are symmetrically arranged on the outside of the protection support sleeve. A guiding groove penetrating through its top surface and bottom surface is opened at the outer end of the support rib. Both of the two support sliding plates are used to be fixedly arranged on the frame housing, and the support sliding plates can be slidably embedded in the guiding groove.

[0034] In a preferred embodiment of the present invention, the protection support sleeve is connected to the concave spherical pair through a thrust tapered roller bearing. The thrust tapered roller bearing includes an inner bearing ring, an outer bearing ring, and tapered rolling elements clamped between the outer bearing ring and the inner bearing ring. The axis of the tapered rolling elements is inclined. The inner bearing ring is fixedly connected to the concave spherical pair, and the outer bearing ring is fixedly connected to the protection support sleeve.

[0035] In a preferred embodiment of the present invention, a telescopic protective cover is arranged between the screw-down nut and the protection support sleeve. The telescopic protective cover is spaced and sleeved on the outside of the screw-down screw. An oil guiding hole penetrating through its top surface and bottom surface is opened on the support rib, and the oil guiding hole communicates with the spaced area between the telescopic protective cover and the screw-down screw.

[0036] In a preferred embodiment of the present invention, the upper end of the protective support sleeve is connected to the concave spherical pair through a deep groove ball bearing. The deep groove ball bearing includes a bearing upper ring, a bearing lower ring arranged at parallel intervals up and down, and spheres clamped between the bearing upper ring and the bearing lower ring. An annular protective plate is fixedly provided above the bearing upper ring. The protective plate is fixedly connected to the pressing screw, and the protective plate is located above the top of the protective support sleeve. The bearing lower ring is fixedly connected to the protective support sleeve.

[0037] In a preferred embodiment of the present invention, the outer edge of the protective plate extends downward to form an annular retaining ring. The retaining ring is sleeved on the outside of the top of the protective support sleeve and there is a gap between the retaining ring and the outside of the top of the protective support sleeve.

[0038] In a preferred embodiment of the present invention, the protective support sleeve includes a cylindrical body with openings at both ends. Support ribs are provided on the outside of the cylindrical body. A first stepped hole, a second stepped hole and a third stepped hole with gradually increasing pore diameters from top to bottom are formed in the cylindrical body. There is an installation ring on the inner side of the bottom of the first stepped hole. The bottom outside of the concave spherical pair has a stop step. The inner ring of the bearing is sleeved and fixed on the stop step. The outer ring of the bearing is sleeved and fixed on the hole wall of the second stepped hole. The bearing lower ring is sleeved and fixed on the installation ring. The protective plate is provided above the top of the cylindrical body.

[0039] In a preferred embodiment of the present invention, the spherical pair seat is a cylindrical structure with an open upper end. The upper end of the cylindrical structure is inserted into the lower inner side of the protective support sleeve, and the upper end face of the cylindrical structure is located below the bottom end of the concave spherical pair.

[0040] In a preferred embodiment of the present invention, the guide groove is a V-shaped groove.

[0041] In a preferred embodiment of the present invention, two installation grooves are provided at the outer ends of the support ribs. An inclined plate can be detachably installed in each installation groove. The two inclined plates enclose to form a V-shaped groove.

[0042] In a preferred embodiment of the present invention, a convex block is provided in the installation groove. A clamping groove is formed on the inclined plate. The convex block can be clamped in the clamping groove, and the inclined plate is connected to the support rib through a fastener.

[0043] As described above, in the screwdown thread pair protection device of the present invention, by providing a protection support sleeve and a support slide plate, and fixing the support slide plate on the frame housing during use, the screwdown screw no longer becomes a cantilever beam but a simply supported beam; as rolling progresses, no matter what causes the tilting of the bearing block, resulting in the spherical pair seat and the convex spherical pair tilting together, the axial force and impact force transmitted to the concave spherical pair can be transmitted to the frame housing through the protection support sleeve and the support slide plate; therefore, no matter how the bearing block tilts, it will not drive the concave spherical pair to tilt together, effectively ensuring the centering of the concave spherical pair and not changing the bending deflection of the screwdown screw; effectively protecting the screwdown screw, reducing its bending deflection, and further reducing the wear of the screwdown nut, effectively protecting the screwdown nut and extending the service life of the screwdown thread pair. In addition, compared with the prior art, the structural size of the screwdown thread pair can be appropriately reduced, thereby reducing the processing and manufacturing difficulty of the screwdown thread pair and the difficulty of assembly and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The following drawings are only intended to illustrate and explain the present invention schematically and do not limit the scope of the present invention. Among them:

[0045] Figure 1 is a partial structural view of some equipment in the screwdown system in the prior art.

[0046] Figure 2 is Figure 1 a partially enlarged view of the cooperation between the roll balance beam and the bearing block at the hooked part in

[0047] Figure 3 is Figure 1 a cooperation view of the clearances of various components in the equipment of

[0048] Figure 4 is a force schematic diagram of the screwdown thread pair in the prior art.

[0049] Figure 5 is a schematic diagram of the deflection of the screwdown screw after the bearing block tilts in the prior art.

[0050] Figure 6 is a simplified force principle diagram of the screwdown screw with the screwdown nut in the prior art.

[0051] Figure 7 is a three-dimensional view of the screwdown thread pair protection device provided by the present invention in cooperation with the frame housing, the bearing block, the roll balance beam and the roll.

[0052] Figure 8 is a sectional view of the screwdown thread pair protection device provided by the present invention in cooperation with the frame housing, the bearing block, the roll balance beam and the roll.

[0053] Figure 9 is Figure 8Partial enlarged view at M in the figure.

[0054] Figure 10 Cross-sectional view of the screw down screw, concave spherical pair and protective support sleeve provided by the present invention in cooperation.

[0055] Figure 11 Schematic diagram of the protective support sleeve transmitting load provided by the present invention.

[0056] Figure 12 is Figure 11 Partial enlarged view at N in the figure.

[0057] Figure 13 Top view of the protective support sleeve cooperating with the support slide plate and the housing stand provided by the present invention.

[0058] Figure 14 is Figure 13 Partial enlarged view of the mating part of the support rib and the support slide plate in the figure.

[0059] Figure 15 Cross-sectional view of the protective support sleeve cooperating with the concave spherical pair, bearing inner ring, tapered roller, bearing upper ring, sphere and protective plate provided by the present invention.

[0060] Figure 16 Cross-sectional view of the protective support sleeve cooperating with the bearing outer ring and the bearing lower ring provided by the present invention.

[0061] Figure 17 Stereogram of the protective support sleeve cooperating with the thrust tapered roller bearing, deep groove ball bearing and protective plate provided by the present invention.

[0062] Figure 18 Stereogram of the support slide plate provided by the present invention.

[0063] Figure 19 Simplified force principle sketch of the screw down screw with the screw down nut provided by the present invention.

[0064] Explanation of the reference numerals in the drawings:

[0065] Prior art:

[0066] 01. Housing stand; 02. Screw down nut; 03. Screw down screw; 04. Concave spherical pair; 05. Convex spherical pair; 06. Spherical pair seat; 061. Uniform plate; 062. Pressure sensor; 07. Spherical pair seat support; 08. Roll balance beam; 09. Roll; 010. Bearing seat; A. Housing stand slide plate surface; B. Bearing seat slide plate surface; C. Roll balance beam outer slide plate surface; d1. First gap; d2. Second gap; d3. Third gap; F. Rolling force; FZ. Axial force; FC. Impact force.

[0067] The present invention:

[0068] 100. Press down the thread protection device;

[0069] 1. Press down the nut; 11. Retractable protective cover; 111. Receiver;

[0070] 2. Press down the screw;

[0071] 3. Concave spherical surface pair; 31. Stop step;

[0072] 4. Convex spherical pair;

[0073] 5. Spherical sub-seat; 51. Uniform plate; 52. Pressure sensor;

[0074] 6. Protective support sleeve; 61. Cylindrical body; 611. First step hole; 612. Mounting ring; 613. Second step hole; 614. Third step hole; 62. Support rib; 621. Guide groove; 622. Oil guide hole; 623. Mounting groove; 6231. Bump; 624. Inclined plate; 6241. Card slot;

[0075] 7. Thrust tapered roller bearing; 71. Bearing inner ring; 72. Tapered rolling element; 73. Bearing outer ring;

[0076] 8. Deep groove ball bearing; 81. Upper bearing ring; 811. Protective plate; 8111. Retaining ring; 82. Ball; 83. Lower bearing ring;

[0077] 9. Supporting slide plate; 91. V-shaped slide plate surface;

[0078] 200, frame arch; 201, column; 202, frame slide plate;

[0079] 300, bearing seat;

[0080] 400, roller balance beam;

[0081] 500, roller;

[0082] F, rolling force; FZ, axial force; FC, impact force. DETAILED DESCRIPTION

[0083] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0084] like Figures 7 to 19As shown in the figure, this embodiment provides a protection device 100 for the screw-down thread pair, which includes a screw-down nut 1, a screw-down screw 2, a concave spherical pair 3, a convex spherical pair 4, and a spherical pair seat 5. The screw-down nut 1 is used to be fixedly arranged in the frame housing 200, and the screw-down screw 2 is inserted into the screw-down nut 1. The concave spherical pair 3 is fixedly arranged at the bottom end of the screw-down screw 2, the convex spherical pair 4 is arranged below the concave spherical pair 3, and the convex spherical pair 4 is arranged in the spherical pair seat 5. The protection device 100 for the screw-down thread pair further includes a protection support sleeve 6 and two support slides 9. The protection support sleeve 6 is sleeved and pivotally connected to the outside of the concave spherical pair 3. Two support ribs 62 are symmetrically arranged on the outside of the protection support sleeve 6, and a guide groove 621 penetrating through its top surface and bottom surface is provided at the outer end of the support rib 62. Both of the two support slides 9 are used to be fixedly arranged on the frame housing 200, and the support slide 9 is slidably embedded in the guide groove 621.

[0085] Among them, the protection device 100 for the screw-down thread pair belongs to a part of the screw-down system of the rolling mill. The cooperation relationships of the screw-down nut 1, the screw-down screw 2, the concave spherical pair 3, the convex spherical pair 4, the spherical pair seat 5 with the bearing housing 300 of the roll 500 and the frame housing 200 are basically the same as those in the prior art Figure 1 . The concave spherical pair 3 is installed at the end of the screw-down screw 2 and becomes an integral part with the screw-down screw 2, and can transmit the axial pressure, that is, the rolling force F. The spherical pair seat 5 is also placed on the bearing housing 300 and can move together with the bearing housing 300. The difference mainly lies in that in this embodiment, the lower part of the concave spherical pair 3 is no longer assembled in the spherical pair seat 5, and only the convex spherical pair 4 and the uniform plate 51 and the pressure sensor 52 below the convex spherical pair 4 are assembled in the spherical pair seat 5.

[0086] At the same time, compared with the prior art, in this embodiment, a protection support sleeve 6 and support slides 9 are added. The two support slides 9 are specifically fixed on the two columns 201 of the frame housing 200 respectively, and the length direction of the support slide 9 extends in the vertical direction. The whole protection support sleeve 6 is rotatably connected to the concave spherical pair 3. When the screw-down screw 2 rotates and moves up and down, the protection support sleeve 6 can keep circumferentially stationary and will not rotate together with the concave spherical pair 3, and can effectively play a circumferential support role. Furthermore, during the rolling process, the axial force FZ and the impact force FC transmitted to the screw-down screw 2 can be transmitted to the frame housing 200 through the support ribs 62 and the support slides 9. At the same time, the two support ribs 62 on both sides of the protection support sleeve 6 have guide grooves 621 and can slide on the two support slides 9. When the screw-down screw 2 rotates and moves up and down, the protection support sleeve 6 can also move up and down together with the screw-down screw 2 and the bearing housing 300.

[0087] If the screw-down nut 1 is simplified into a part with an axial guide sleeve function and a vertical direction support function, then the force conditions of the screw-down nut 1, the screw-down screw 2, the protection support sleeve 6, and the frame housing 200 can be simplified as Figure 19As shown in the figure, the screw-down screw 2 is subjected to the transmitted axial force FZ and impact force FC. Since each end of each roll 500 corresponds to a housing stand 200, a screw-down screw 2, and a screw-down nut 1 respectively, each screw-down screw 2 is subjected to half of the rolling force F / 2 transmitted by the roll 500 in the vertically upward direction, and at the same time is also subjected to half of the rolling force F / 2 in the vertically downward direction given by the screw-down nut 1 to the screw-down screw 2.

[0088] After the protective support sleeve 6 and the support slide plate 9 are provided, the screw-down nut 1 axially bears the rolling force, and at the same time has a guiding function in the circumferential direction and becomes the first simple support point; the protective support sleeve 6 is installed at the end of the screw-down screw 2, and at the same time can slide up and down on the support slide plate 9 in the window of the housing stand 200, playing a circumferential support role for the screw-down screw 2 and becoming the second simple support point, and can transmit the axial force FZ and the impact force FC to the housing stand 200; furthermore, a two-point guiding support is formed for the screw-down screw 2, and the screw-down screw 2 becomes a simply supported beam, solving the problem of the cantilever of the screw-down screw 2. In this way, when the bearing block 300 is inclined due to reasons such as increased wear of the slide plate, increased gap (that is, the gap between the slide plate surface of the housing slide plate 202 on the column 201, the slide plate surface of the bearing block 300, and the outer slide plate surface of the roll balance beam 400 is continuously increased), and the impact of the inclination of the bearing block 300, the bending deflection of the screw-down screw 2 will not change, achieving the solution to the deflection problem of the screw-down screw 2.

[0089] Therefore, the screw-down thread pair protection device 100 in this embodiment, by setting the protective support sleeve 6 and the support slide plate 9, and fixing the support slide plate 9 on the housing stand 200 during use, makes the screw-down screw 2 no longer a cantilever beam but a simply supported beam; as the rolling progresses, no matter what causes the bearing block 300 to tilt, resulting in the spherical pair seat 5 and the convex spherical pair 4 tilting together, through the protective support sleeve 6 and the support slide plate 9, the axial force FZ and the impact force FC transmitted to the concave spherical pair 3 can be transmitted to the housing stand 200; therefore, no matter how the bearing block 300 tilts, it will not drive the concave spherical pair 3 to tilt together, effectively ensuring the centering of the concave spherical pair 3 and not changing the bending deflection of the screw-down screw 2; effectively protecting the screw-down screw 2, reducing its bending deflection, and further reducing the wear of the screw-down nut 1, effectively protecting the screw-down nut 1 and extending the service life of the screw-down thread pair. In addition, compared with the prior art, the structural size of the screw-down thread pair can be appropriately reduced (that is, reducing the diameters of the screw-down screw 2 and the screw-down nut 1), thereby reducing the processing and manufacturing difficulty of the screw-down thread pair and reducing the assembly and disassembly difficulty.

[0090] In a specific implementation manner, such as Figures 9 to 16As shown in the figure, the protective support sleeve 6 is connected to the concave spherical pair 3 through a thrust tapered roller bearing 7. The thrust tapered roller bearing 7 includes an inner bearing ring 71, an outer bearing ring 73, and tapered rolling elements 72 clamped between the outer bearing ring 73 and the inner bearing ring 71. The axis of the tapered rolling elements 72 is inclined (specifically, the axis of the tapered rolling elements 72 is inclined upward from the outside to the inside), the inner bearing ring 71 is fixedly connected to the concave spherical pair 3, and the outer bearing ring 73 is fixedly connected to the protective support sleeve 6.

[0091] In this way, the inner bearing ring 71 and the concave spherical pair 3 become an integral body and rotate up and down together with the screw 2 under the same pressure. The load transfer process is as follows: the rolling force F is transmitted to the concave spherical pair 3 through the convex spherical pair 4, and then transmitted to the screw 2 → the screw nut 1 → the housing 200. The impact force FC and the axial force FZ are transmitted through the concave spherical pair 3 → the inner bearing ring 71 → the tapered rolling elements 72 → the outer bearing ring 73 → the protective support sleeve 6 → the support slide 9 → the housing 200. Using the thrust tapered roller bearing 7 to connect the protective support sleeve 6 and the concave spherical pair 3 not only realizes the relative rotation of the two, but also the thrust tapered roller bearing 7 can bear both axial force and radial force, and can better transmit the impact force FC and the axial force FZ transmitted to the screw 2 to the protective support sleeve 6 and the support slide 9 through this bearing in sequence, and finally transmitted to the housing 200, thereby effectively ensuring the centering of the concave spherical pair 3. Of course, other connection methods can also be adopted between the protective support sleeve 6 and the concave spherical pair 3, as long as the relative rotation of the two can be realized, and at the same time, the impact force FC and the axial force FZ can be borne and transmitted.

[0092] In actual application, there is lubricating oil in the screw pair composed of the screw nut 1 and the screw 2. Under the action of gravity, the lubricating oil will flow downward. Generally, in order to prevent the flowing lubricating oil from splashing outward, as Figure 8 and Figure 9 shown, a telescopic protective cover 11 is provided between the screw nut 1 and the protective support sleeve 6, and the telescopic protective cover 11 is sleeved outside the screw 2 at intervals. An oil guide hole 622 penetrating through its top and bottom surfaces is opened on the support rib 62, and the oil guide hole 622 communicates with the interval area between the telescopic protective cover 11 and the screw 2. Among them, the upper end of the telescopic protective cover 11 is fixed to the housing 200, and its lower end is fixed to the support rib 62. A receiving device 111 is also connected to the bottom of the protective support sleeve 6. When the lubricating oil flows downward, it flows downward through the oil guide hole 622 into the receiving device 111, and then is diverted to the outside through the oil guide pipe connected to the receiving device 111.

[0093] Since the material of the screw nut 1 is alloy copper and the material is relatively soft, in the continuous friction with the screw 2, the flowing lubricating oil will carry copper powder to form dirty oil. In order to prevent the dirty oil from flowing downward into the above-mentioned thrust tapered roller bearing 7, as Figure 9, Figure 10 , Figure 15 and Figure 16 As shown in Figure 10 , Figure 15 , and Figure 16 , the upper end of the protective support sleeve 6 is connected to the concave spherical pair 3 through a deep groove ball bearing 8. The deep groove ball bearing 8 includes a bearing upper ring 81, a bearing lower ring 83 arranged at parallel intervals up and down, and spheres 82 clamped between the bearing upper ring 81 and the bearing lower ring 83. An annular protective plate 811 is fixedly provided above the bearing upper ring 81. The protective plate 811 is fixedly connected to the press-down screw 2, and the protective plate 811 is located above the top of the protective support sleeve 6 (there is a gap between the protective plate 811 and the top surface of the protective support sleeve 6). The bearing lower ring 83 is fixedly connected to the protective support sleeve 6. The outer diameter of the protective plate 811 is larger than the outer diameter of the top of the protective support sleeve 6. By providing the protective plate 811, it can block dirty oil and prevent dirty oil from entering the thrust tapered roller bearing 7, playing a protective role for the thrust tapered roller bearing 7.

[0094] When the press-down screw 2 rotates up and down, the protective plate 811 and the bearing upper ring 81 will rotate up and down together, and the protective support sleeve 6 and the bearing lower ring 83 remain circumferentially stationary. Here, the deep groove ball bearing 8 mainly serves to separate the relative rotational movement between the protective plate 811 and the protective support sleeve 6, and does not play a role in force transmission. Therefore, using this type of deep groove ball bearing 8 is not only convenient for installation but also has a smaller size. Of course, the protective plate 811 and the protective support sleeve 6 can also be connected in other ways according to needs. This embodiment is only for illustrative purposes.

[0095] Preferably, in order to make the protective plate 811 have a better oil-blocking effect, as Figure 9 and Figure 10 shown, the outer edge of the protective plate 811 extends downward to form an annular retaining ring 8111. The retaining ring 8111 is sleeved on the outside of the top of the protective support sleeve 6 and there is a gap between the retaining ring 8111 and the outside of the top of the protective support sleeve 6.

[0096] Furthermore, for the convenience of processing and installation, as Figure 10 and Figure 16 shown, the protective support sleeve 6 includes a cylindrical body 61 with openings at both ends, and support ribs 62 are provided on the outside of the cylindrical body 61. A first stepped hole 611, a second stepped hole 613, and a third stepped hole 614 with gradually increasing pore diameters from top to bottom are formed inside the cylindrical body 61. There is an installation ring 612 on the inner side of the bottom of the first stepped hole 611, and a stop step 31 is provided on the outside of the bottom of the concave spherical pair 3. The inner ring 71 of the bearing is sleeved and fixed on the stop step 31, and the outer ring 73 of the bearing is sleeved and fixed on the inner wall of the second stepped hole 613. The bearing lower ring 83 is sleeved and fixed on the installation ring 612, and the protective plate 811 is provided above the top of the cylindrical body 61.

[0097] The above spherical pair seat 5 is a cylindrical structure with an open upper end. The upper end of the cylindrical structure is inserted into the inner side of the lower part of the protection support sleeve 6 (specifically inserted into the above-mentioned third stepped hole 614), and the upper end surface of the cylindrical structure is located below the bottom end of the concave spherical pair 3. The above convex spherical pair 4, the uniform plate 51 and the pressure sensor 52 are installed in the cylindrical structure, so that when the spherical pair seat 5 tilts with the bearing seat 300, it will only drive the convex spherical pair 4 to tilt together, but will not affect the concave spherical pair 3.

[0098] Furthermore, in order to facilitate the processing and installation of the above-mentioned guide groove 621 and the support slide plate 9, the guide groove 621 is preferably a V-shaped groove. It can be understood that the cross-sectional shape of a part of the support slide plate 9 is the same as the cross-sectional shape of the guide groove 621 (specifically, the cross-sectional shape in the horizontal plane). When the guide groove 621 is a V-shaped groove, as Figure 18 shown, a V-shaped slide plate surface 91 is formed on the support slide plate 9, and the two cooperate with each other. Generally, a plurality of through holes are formed in the support slide plate 9 along its length direction, and it can be installed on the frame housing 200 through fasteners (such as screws).

[0099] Furthermore, since the outer end of the support rib 62 is in sliding fit with the support slide plate 9, the outer end of the support rib 62 is a wearing part and needs to be replaced regularly. Therefore, for the convenience of replacement, as Figure 17 shown, two installation grooves 623 are formed at the outer end of the support rib 62, and an inclined plate 624 can be detachably installed in each installation groove 623. The two inclined plates 624 enclose to form a V-shaped groove.

[0100] Generally, in order to make the connection between the inclined plate 624 and the support rib 62 more convenient, a convex block 6231 is provided in the installation groove 623, and a clamping groove 6241 is formed on the inclined plate 624. The convex block 6231 can be clamped in the clamping groove 6241, and the inclined plate 624 is connected to the support rib 62 through fasteners. Through holes are formed in the inclined plate 624. After aligning the clamping groove 6241 of the inclined plate 624 with the convex block 6231 and clamping it, the inclined plate 624 and the support rib 62 can be fixed through fasteners (such as screws), and the disassembly and assembly are convenient.

[0101] In summary, for the screwdown thread pair protection device 100 in this embodiment, by arranging the protection support sleeve 6 and the support slide plate 9 outside the concave spherical pair 3, when the screwdown screw 2 rotates and moves up and down, the protection support sleeve 6 can move up and down along the support slide plate 9, and the protection support sleeve 6 can remain circumferentially stationary, which can play a role in circumferential support for the concave spherical pair 3. The protection support sleeve 6 is connected to the concave spherical pair 3 through the thrust tapered roller bearing 7, which can effectively solve the problem of relative rotation between the two. Moreover, the thrust tapered roller bearing 7 can well bear the axial force and the radial force, and better transmit the impact force FC and the axial force FZ to the load on the screwdown screw 2 and then to the housing 200 of the rolling mill stand. The whole device has a simple structure, makes the screwdown screw 2 form a simply supported beam, can better protect the screwdown screw 2 and the screwdown nut 1, and can appropriately reduce the structural size of the thread pair, which is more conducive to processing and assembly.

[0102] The above is only a schematic specific embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A protection device for a screw pair under pressure, comprising a pressure-down nut, a pressure-down screw, a concave spherical pair, a convex spherical pair and a spherical pair seat. The pressure-down nut is used to be fixed in a housing of a rolling mill stand, and the pressure-down screw is arranged through the pressure-down nut. The concave spherical pair is fixed at the bottom end of the pressure-down screw, the convex spherical pair is arranged below the concave spherical pair, and the convex spherical pair is arranged in the spherical pair seat. It is characterized in that, The protection device for the screw pair of the screw-down mechanism further includes a protective support sleeve and two support sliding plates; The protective support sleeve is sleeved and pivotally connected to the outside of the concave spherical pair. Two support ribs are symmetrically arranged on the outside of the protective support sleeve. A guiding groove penetrating through the top surface and the bottom surface is formed at the outer end of the support rib. Both of the two support sliding plates are used for being fixedly arranged on the frame housing, and the support sliding plates are slidably embedded in the guiding groove. The spherical pair seat is a cylindrical structure with an open upper end. The upper end of the cylindrical structure is inserted into the inner side of the lower part of the protective support sleeve, and the upper end surface of the cylindrical structure is located below the bottom end of the concave spherical pair. A telescopic protective cover is arranged between the screw-down nut and the protective support sleeve, and the telescopic protective cover is spacedly sleeved on the outside of the screw-down screw. An oil guiding hole penetrating through the top surface and the bottom surface is formed on the support rib, and the oil guiding hole communicates with the spaced area between the telescopic protective cover and the screw-down screw.

2. The protection device for the screw pair of the screw-down mechanism according to claim 1, wherein the protective support sleeve is connected to the concave spherical pair through a thrust tapered roller bearing. The thrust tapered roller bearing includes an inner bearing ring, an outer bearing ring, and tapered rolling elements clamped between the outer bearing ring and the inner bearing ring. The axis of the tapered rolling elements is inclined. The inner bearing ring is fixedly connected to the concave spherical pair, and the outer bearing ring is fixedly connected to the protective support sleeve.

3. The protection device for the screw pair of the screw-down mechanism according to claim 2, wherein the upper end part of the protective support sleeve is connected to the concave spherical pair through a deep groove ball bearing. The deep groove ball bearing includes an upper bearing ring, a lower bearing ring arranged at parallel intervals up and down, and spheres clamped between the upper bearing ring and the lower bearing ring. An annular protective plate is fixedly arranged above the upper bearing ring. The protective plate is fixedly connected to the screw-down screw, and the protective plate is located above the top end of the protective support sleeve. The lower bearing ring is fixedly connected to the protective support sleeve.

4. The protection device for the screw pair of the screw-down mechanism according to claim 3, wherein the outer edge of the protective plate extends downward to form an annular retaining ring. The retaining ring is sleeved on the outside of the top end of the protective support sleeve and there is a gap between the retaining ring and the outside of the top end of the protective support sleeve.

5. The protection device for the screw pair of the screw-down mechanism according to claim 3, wherein the protective support sleeve includes a cylindrical body with openings at both ends. The support ribs are arranged on the outside of the cylindrical body. A first stepped hole, a second stepped hole, and a third stepped hole with diameters increasing sequentially from top to bottom are formed inside the cylindrical body. There is an installation ring on the inner side of the bottom of the first stepped hole. The bottom outside of the concave spherical pair has a stop step. The inner bearing ring is sleeved and fixed on the stop step. The outer bearing ring is sleeved and fixed on the hole wall of the second stepped hole. The lower bearing ring is sleeved and fixed on the installation ring. The protective plate is arranged above the top end of the cylindrical body.

6. The protection device for the screw pair of the screw-down mechanism according to claim 1, wherein the guiding groove is a V-shaped groove.

7. The protection device for the screw pair of the screw-down, as described in claim 6, is characterized in that two mounting grooves are provided at the outer ends of the support ribs, and an inclined plate is detachably mounted in each mounting groove, and the two inclined plates enclose to form the V-shaped groove.

8. The protection device for the screw pair of the screw-down, as described in claim 7, is characterized in that a convex block is provided in the mounting groove, a clamping groove is formed on the inclined plate, the convex block can be clamped in the clamping groove, and the inclined plate is connected to the support rib through a fastener.

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