Roll gap adjusting device

Abstract

The utility model discloses a roll gap adjusting device. Comprising an upper bearing seat and a lower bearing seat which are oppositely arranged; the upper bearing seat and the lower bearing seat are sleeved on the pull rod and are movably matched with the pull rod in the axial direction; a pressing mechanism is mounted at the upper end of the pull rod; the pull rod is in transmission connection with the screw-down mechanism; end curved surface gears are coaxially arranged on the pull rod in the upper bearing seat and the lower bearing seat; an adjusting gear meshed with the end curved surface gear is arranged on at least one side of the upper bearing seat and the lower bearing seat corresponding to the end curved surface gear; the pressing mechanism drives the pull rod to rotate, and meanwhile the end curved surface gear rotates along with the pull rod, so that the upper bearing seat and the lower bearing seat are driven by the adjusting gear to move upwards or downwards according to the curve of the end curved surface gear. The unthreaded modular design is adopted, maintenance and roll gap adjusting operation are facilitated, the adjusting efficiency is improved, meanwhile, abrasion is reduced, and reliability is improved.

Description

Technical Field

[0001] The utility model relates to a roller gap adjusting device. Background Art

[0002] Short stress line mill has the advantages of high rigidity, high precision, light weight, easy operation and adjustment, low maintenance cost, quick replacement, etc., and is widely used in hot rolling long product production lines. The core of short stress line mill is generally composed of four parts: roll gap adjustment device, tie rod assembly, roll assembly and guide beam assembly.

[0003] The tie rod assembly also plays the role of connecting the core structures such as the press-down device and the bearing seat. The pull rod is driven to rotate by the press-down device. The screw structure formed by the pull rod thread and the adjusting nut can make the bearing seat move axially on the pull rod, so as to achieve the purpose of adjusting the size of the mill roll gap. The screw transmission mechanism will affect the accuracy of the mill roll gap adjustment due to its thread gap characteristics. Therefore, existing rolling mills will be designed with a set of thread gap elimination mechanisms. Usually, disc spring groups, spherical pads or hydraulic devices are used to eliminate them. However, existing devices usually have poor uniformity, are prone to wear and fatigue failure, and the replacement of disc spring groups and hydraulic devices is relatively complicated. The tie rod threads will also wear during use. Utility Model Content

[0004] In order to overcome the above-mentioned defects, the purpose of the utility model is to provide a roller gap adjustment device based on end curved gears, which replaces the traditional screw slider mechanism, fundamentally eliminates the influence of the thread gap on the roller gap, and also solves the problem of uneven force on the disc spring group. At the same time, the structural wearing parts adopt a modular design, which is easy to replace and improves efficiency.

[0005] In order to achieve the above-mentioned purpose, the roller gap adjustment device of the utility model comprises an upper bearing seat and a lower bearing seat which are arranged opposite to each other; the upper bearing seat and the lower bearing seat are sleeved on the pull rod, and the upper bearing seat and the lower bearing seat are movably matched with the pull rod in the axial direction; a pressing mechanism is installed on the upper end of the pull rod; the pull rod is connected to the pressing mechanism in a transmission manner;

[0006] End curved surface gears are coaxially arranged on the pull rods in the upper bearing seat and the lower bearing seat;

[0007] An adjusting gear meshing with the end curved surface gear is provided on at least one side of the upper bearing seat and the lower bearing seat corresponding to the end curved surface gear;

[0008] The pressing mechanism drives the pull rod to rotate, and the end curved surface gear rotates accordingly, so as to drive the upper bearing seat and the lower bearing seat to move upward or downward according to the curve of the end curved surface gear through the adjusting gear.

[0009] Further, adjusting gears meshing with the end surface gears are arranged on both corresponding end surfaces of the upper bearing block and the lower bearing block.

[0010] Further, bearing covers are arranged above the upper bearing block and below the lower bearing block; a disc spring group is sleeved on a pull rod between the bearing cover and the end surface gear.

[0011] Further, a thrust bearing is sleeved on the pull rod between the end surface gear and the disc spring group.

[0012] Further, pin holes are arranged on the pull rod and the end surface gear, and a pin passes through the pin hole to fix the end surface gear on the pull rod.

[0013] Further, a retaining ring for positioning and clamping the pin is arranged at the tail of the pin.

[0014] Further, gear holes corresponding to the adjusting gears are arranged on the upper bearing block and the lower bearing block, and an external gear cover is arranged on the gear hole; the adjusting gear is coaxially installed inside the external gear cover, and one end of the driving shaft of the adjusting gear is pivotally connected to the external gear cover.

[0015] Further, a strip-shaped internal gear seat with a diameter equivalent to that of the external gear cover is also included, and the internal gear seat is installed on the external gear cover; the adjusting gear is installed between the external gear cover and the internal gear seat; the other end of the driving shaft is pivotally connected to the internal gear seat.

[0016] Further, adjusting gears are arranged on the bearing blocks on both sides of the pull rod, and the curved surface shapes of the end surface gears should be the same and centrosymmetric in opposite directions.

[0017] The utility model adopts a threadless modular design, which is convenient for maintenance and roll gap adjustment operation, changes the design concept of traditional mechanical preloading and hydraulic real-time preloading pull rods, designs a new pull rod, improves the adjustment efficiency, and at the same time reduces wear and improves reliability, specifically reflected in:

[0018] 1. The utility model adopts a gear adjustment as the core structure. Compared with the traditional screw rod slider mechanism, it does not require roll gap elimination, reduces the structure of the pull rod parts, and reduces costs and improves reliability;

[0019] 2. The end surface gear of the utility model is connected to the surface gear through a pin, and a thrust bearing is adopted between the rotating mechanism and the disc spring group, and the pressure is stable in all directions, improving the service life of the disc spring group;

[0020] 3. The core components of the utility model adopt a modular design, and compared with the existing threaded screw rod structure, the transmission components are transferred to replaceable parts, which is easy to replace and maintain, and reduces production and use costs;

[0021] In summary, the application of the technology of the present utility model solves the problems in the prior art: 1. The pull rod requires a locking device, with a complex structure; 2. The disc spring group is prone to fatigue failure under multi-directional impacts, resulting in insufficient or ineffective elimination of the thread clearance; 3. The threads of the pull rod are prone to wear, with high costs and being not conducive to replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the positions of the upper and lower bearing seats in the present invention;

[0023] Figure 2 Schematic diagram of the mechanical structure of the threadless pull rod of the upper bearing seat in the present invention;

[0024] Figure 3 Schematic diagram of the meshing of the end curved surface gear and the adjusting gear in the present invention;

[0025] Figure 4 Schematic diagram of the positions of the outer gear cover and the adjusting gear in the present invention.

[0026] Figure 5 Schematic diagram of the structure of the inner gear seat in the present invention.

[0027] Figure 6 Schematic diagram of the meshing effect of the adjusting gear and the end curved surface gear in the present invention.

[0028] BRIEF DESCRIPTION OF THE DRAWINGS: 1. Pull rod; 2. Disc spring group; 3. Disc spring group pad; 4. Thrust bearing; 5. Upper bearing seat; 6. Plug pin; 7. Outer gear cover; 8. End curved surface gear; 9. Adjusting gear; 10. Inner gear seat; 11. Sliding bearing; 12. Sealing ring; 15. Lower bearing seat; 25. Pressing-down mechanism. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0030] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0032] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] As Figure 1 shown, the present utility model includes an upper bearing seat 5, a lower bearing seat 15, and a screw-down mechanism 25; a pull rod 1 is in transmission connection with the screw-down mechanism 25; the screw-down mechanism drives the pull rod to rotate to complete the adjustment of the roll gap, that is, the adjustment of the distance between the upper bearing seat 5 and the lower bearing seat 15.

[0034] Since the upper bearing seat and the lower bearing seat are symmetrically arranged, only the upper bearing seat will be taken as an example for description below:

[0035] The pull rod (1) passes through a hole in the vertical direction of the upper bearing seat (5), and there is a set of disc spring groups (2) therebetween. The disc spring groups are connected to the bottom of the end surface gear (8) of the thrust bearing (4) through gaskets (3) and are in direct contact with the bearing seat cover. The pull rod (1) and the end surface gear (8) are fixed to the pull rod through pins (6). Four pins (6) are installed at intervals of 90° for positioning; a retaining ring for positioning and jamming the pin is provided at the tail of the pin, which can prevent the pin from popping out of the hole on the side of the bearing seat.

[0036] Among them, the adjustment ability is changed by changing the positions of the pin holes, the height of the end surface gear (8), the curved surface shape, and the gear parameters;

[0037] The above disc spring groups do not have relative displacement with the bearing seat cover. They are connected to the thrust bearing through gaskets and can rotate relative to the pull rod and the end surface gear;

[0038] The above pull rod and the bearing seat are sealed through a cover and a sealing ring and can have relative axial displacement;

[0039] The two long sides of the bearing housing (5) are provided with circular through holes in the horizontal direction. The outer gear cover (7) is inserted into the through holes and fitted with the holes, and is connected to the bearing housing by bolts and sealed with an annular sealing ring. The use of circular through holes can facilitate the adjustment of the installation of the gear (9).

[0040] An inner gear seat (10) is correspondingly arranged on the inner side of the outer gear cover (7), and the two are connected by bolts. Therefore, when the adjusting gear (9) is arranged between the outer gear cover (7) and the inner gear seat (10), the adjusting gear (9) can be quickly replaced when it is worn, without hoisting the bearing housing.

[0041] As shown in the figure, after the adjusting gear (9) is installed, it meshes with the end surface gear (8) installed on the pull rod (1); the adjusting gear and the gear mounting seat are installed in pairs to ensure the same pressure on both sides of the pull rod; at this time, the curved surface shape of the end surface gear (8) should be the same and centrosymmetric in the opposite direction to maintain the same pressure on both sides of the pull rod;

[0042] During design, the roll gap adjustment ability can be changed by changing the shape of the adjusting gear (9) and the gear parameters as needed.

[0043] The present utility model also discloses a roll gap adjustment method for the above-mentioned threadless pull rod device. When performing roll gap adjustment operations, the pull rod (1) obtains power through the pressing mechanism and rotates, and drives the end surface gear (9) to rotate through the pin (6);

[0044] When it rotates, it generates transmission and axial force on the meshing gear. Therefore, the upper bearing housing (5) will generate axial movement under the drive of its pull rod (1), so the roll gap of the rolling mill can be adjusted;

[0045] During design, the range of roll gap adjustment is adjusted by adjusting parameters such as the curved surface curvature and the number of teeth of the end surface gear (8) and the adjusting gear (9);

[0046] As a deformation of the present utility model, the end surface gear (8) can be replaced with a flat gear, and the adjusting gear (9) can be replaced with a special-shaped gear such as an elliptical gear, or they can be combined with each other to meet different roll gap adjustment requirements; after the roll gap adjustment is completed, locking can be performed to complete the roll gap adjustment, or an on-line roll gap adjustment device can be connected to continuously adjust the roll gap.

[0047] The above has described the present utility model in detail with reference to the drawings, but the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present utility model. Many other changes and modifications made without departing from the concept and scope of the present utility model should be regarded as within the protection scope of the present utility model.

[0048] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

[0049] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A roller gap adjustment device, characterized in that: It comprises an upper bearing seat and a lower bearing seat which are arranged opposite to each other; the upper bearing seat and the lower bearing seat are sleeved on the pull rod, and the upper bearing seat and the lower bearing seat are movably matched with the pull rod in the axial direction; a pressing mechanism is installed on the upper end of the pull rod; the pull rod is connected to the pressing mechanism in a transmission manner; End curved surface gears are coaxially arranged on the pull rods in the upper bearing seat and the lower bearing seat; An adjusting gear meshing with the end curved surface gear is provided on at least one side of the upper bearing seat and the lower bearing seat corresponding to the end curved surface gear; The pressing mechanism drives the pull rod to rotate, and the end curved surface gear rotates accordingly, so as to drive the upper bearing seat and the lower bearing seat to move upward or downward according to the curve of the end curved surface gear through the adjusting gear.

2. The roller gap adjusting device according to claim 1, characterized in that: Adjusting gears meshing with the end curved surface gears are arranged on the corresponding end curved surface gears on both sides of the upper bearing seat and the lower bearing seat.

3. The roller gap adjusting device according to claim 1, characterized in that: A bearing seat cover is arranged above the upper bearing seat and below the lower bearing seat; a disc spring group is sleeved on the pull rod between the bearing seat cover and the end curved surface gear.

4. The roller gap adjusting device according to claim 1, characterized in that: A thrust bearing is sleeved on the pull rod between the end curved surface gear and the disc spring group.

5. The roller gap adjusting device according to claim 1, characterized in that: Pin holes are arranged on the pull rod and the end curved surface gear, and a pin passes through the pin hole to fix the end curved surface gear on the pull rod.

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