阅读说明：本技术 受限空间内轧机压上缸安装方法 (Installation method for upper cylinder of rolling mill in limited space ) 是由 谷媛媛 范建中 魏尚起 于 2021-05-24 设计创作，主要内容包括：本申请提供了一种受限空间内轧机压上缸安装方法,该方法包括：步骤一,获取施工信息,并根据施工信息设置多个专用吊具；步骤二,对各所述专用吊具的整体强度进行检验；步骤三,将多个所述专用吊具设置在液压缸上；步骤四,在行车吊钩和轧机机架上设置钢丝绳和倒链,并将钢丝绳和倒链分别连接在各所述专用吊具上；步骤五,调节所述倒链,并驱动行车进行起吊,并实时控制所述压上缸的平衡,直至所述压上缸安装就位。通过专用吊具设置在压上缸上,并利用倒链和钢丝绳,连接在行车上进行吊装,并通过调整倒链能够使得压上缸平衡,进而保障压上缸能够安全平稳的安装到位。(The application provides a method for installing a rolling mill upper cylinder in a limited space, which comprises the following steps: the method comprises the following steps that firstly, construction information is obtained, and a plurality of special lifting appliances are arranged according to the construction information; step two, the overall strength of each special lifting appliance is inspected; thirdly, arranging a plurality of special lifting appliances on a hydraulic cylinder; fourthly, arranging steel wire ropes and chain blocks on the crane hook and the rolling mill frame, and respectively connecting the steel wire ropes and the chain blocks to the special lifting appliances; and step five, adjusting the chain block, driving the travelling crane to lift, and controlling the balance of the upper pressing cylinder in real time until the upper pressing cylinder is installed in place. The special lifting appliance is arranged on the upper pressing cylinder, the chain block and the steel wire rope are utilized to connect and hoist on a travelling crane, the upper pressing cylinder can be balanced by adjusting the chain block, and the upper pressing cylinder can be safely and stably installed in place.)

1. A method for installing a rolling mill upper cylinder in a limited space is characterized by comprising the following steps:

the method comprises the following steps that firstly, construction information is obtained, and a plurality of special lifting appliances are arranged according to the construction information;

step two, the overall strength of each special lifting appliance is inspected;

thirdly, arranging a plurality of special lifting appliances on a hydraulic cylinder;

fourthly, arranging steel wire ropes and chain blocks on the crane hook and the rolling mill frame, and respectively connecting the steel wire ropes and the chain blocks to the special lifting appliances;

and step five, adjusting the chain block, driving the travelling crane to lift, and controlling the balance of the upper pressing cylinder in real time until the upper pressing cylinder is installed in place.

2. The rolling mill press-on cylinder installation method in a confined space of claim 1, further comprising:

and sixthly, separating each steel wire rope and each inverted chain from the special lifting appliance, and dismantling each special lifting appliance.

3. The method for installing the pressing cylinder of the rolling mill in the limited space as claimed in claim 1, wherein in the first step, the construction information comprises: weight and size of the pressure-up cylinder, and mounting position size information of the pressure-up cylinder.

4. The method for installing the rolling mill press cylinder in the limited space according to claim 1, wherein in the second step, the method for testing the strength of each special lifting appliance comprises the following steps:

inspecting the welding seam strength of each special lifting appliance;

and testing the strength of the lug plate of each special lifting appliance.

5. The method for installing the rolling mill upper cylinder in the limited space according to claim 4, wherein the method for testing the weld strength of each special lifting appliance comprises the following steps:

according to the formulaObtaining the axial tension or axial pressure of the welding seam;

wherein N is the axial tension or axial pressure (N) of the weld; h is_e-the design thickness (mm) of the butt weld; l_w-length of weld;-tensile, compressive and shear strength indexes for fillet weld design;

and obtaining the welding seam strength of the special lifting appliance according to a formula N which is mg; wherein g is 10 m/s; m is the welding seam strength of the special sling.

6. The method for installing the rolling mill pressing cylinder in the limited space according to claim 4, wherein the method for checking the strength of the lug plate of the special lifting appliance is as follows:

according to the formula sigma N/2tb₁F and formula b₁＝min{2t+16，b-d₀/3}, obtaining the tension at the ear plate hole;

t is the thickness of the lifting lug; d₀-ear plate hole diameter; b, connecting the two side edges of the lifting lug with the net distance of the edge of the shaft hole; f, designing strength index of steel;

and according to formula N₁＝m₁g, obtaining the strength of the lug plate of the special lifting appliance; wherein g is 10 m/s; m is₁The lug plate strength of the special sling.

7. The method for installing the upper cylinder of the rolling mill in the limited space according to claim 1, wherein in the third step, a three-point hoisting method is adopted, three special lifting appliances are uniformly arranged on three threaded holes of the upper cylinder, and each special lifting appliance is fixed.

8. The installation method of the rolling mill pressing cylinder in the limited space according to claim 1, wherein in the fourth step, at least one steel wire rope is arranged, and at least two chain blocks are arranged;

the crane hook is provided with one steel wire rope and one chain block, and the rolling stand is provided with one chain block.

9. The installation method of the upper cylinder of the rolling mill in the limited space as claimed in claim 1, wherein in the fifth step, the hoisting of the upper cylinder comprises the following steps: pre-hoisting and formal hoisting;

in the pre-hoisting process, adjusting each chain block and the steel wire rope to balance the pressing cylinder;

and in the formal hoisting, hoisting the upper pressing cylinder, and in the hoisting process, controlling the balance of the upper pressing cylinder by adjusting each chain block.

10. The method for installing the mill pressing cylinder in the restricted space according to any one of claims 1 to 9, wherein the special spreader comprises:

the lug plate is provided with a through hole, the lug plate is provided with a through groove, and the length direction of the through groove is vertical to the axial direction of the through hole;

one end of the threaded rod is fixedly arranged in the through groove of the lug plate;

and the nut is connected to the threaded rod in an adaptive manner.

Technical Field

The invention belongs to the technical field of mechanical equipment installation, and particularly relates to an installation method of a rolling mill upper cylinder in a limited space.

Background

The rolling mill upper cylinder is a core device of the rolling mill, the quality of the strip is determined by whether the performance of the rolling mill upper cylinder is excellent or not, the hydraulic upper cylinder is one of prominent important marks of the modernization of the rolling mill, the hydraulic upper cylinder is easy to adapt to the changes of rolling and operation conditions, the hydraulic upper cylinder can be optimally compensated according to the rolling type and rolling pass procedures, such as upper rolling or flat rolling, and the rigidity of the rolling mill can be adjusted, and a descending rigidity distribution mode is adopted for the cold rolling mill to obtain a high-quality product, so that the thickness and the flatness of the strip are ensured, and the quality of the strip is optimal no matter under the hardest and softest conditions. Meanwhile, the hydraulic pressing has the characteristics of automatic and quick unloading functions, so that the overload and damage of the roller and the roller bearing are prevented, the service life of the roller is prolonged, and the like. However, the hydraulic upper oil cylinder is installed at the lower part of the rolling mill frame, namely the rolling mill frame is installed and adjusted, and the upper cylinder can be installed after the upper beam of the rolling mill frame is installed, but the hydraulic upper oil cylinder is limited by the space problem in a workshop, and a travelling crane in the workshop cannot be directly hoisted, so that the installation of the upper cylinder is difficult, and the efficiency is low.

Disclosure of Invention

In view of the above, the present invention aims to provide a method for installing a rolling mill upper cylinder in a limited space, so as to solve the problem that it is difficult to install the rolling mill upper cylinder in a workshop in the limited space in the prior art.

The application provides a method for installing a rolling mill upper cylinder in a limited space, which comprises the following steps:

the method comprises the following steps that firstly, construction information is obtained, and a plurality of special lifting appliances are arranged according to the construction information;

step two, the overall strength of each special lifting appliance is inspected;

thirdly, arranging a plurality of special lifting appliances on a hydraulic cylinder;

fourthly, arranging steel wire ropes and chain blocks on the crane hook and the rolling mill frame, and respectively connecting the steel wire ropes and the chain blocks to the special lifting appliances;

and step five, adjusting the chain block, driving the travelling crane to lift, and controlling the balance of the upper pressing cylinder in real time until the upper pressing cylinder is installed in place.

Further, still include:

and sixthly, separating each steel wire rope and each inverted chain from the special lifting appliance, and dismantling each special lifting appliance.

Further, in the first step, the construction information includes: weight and size of the pressure-up cylinder, and mounting position size information of the pressure-up cylinder.

Further, in the second step, the method for testing the strength of each dedicated lifting appliance includes:

inspecting the welding seam strength of each special lifting appliance;

and testing the strength of the lug plate of each special lifting appliance.

Further, the method for testing the weld strength of each special lifting appliance comprises the following steps:

according to the formula τ_f＝N/h_el_w≤f_f ^wObtaining the axial tension or axial pressure of the welding seam;

wherein N is the axial tension or axial pressure (N) of the weld; h is_eDesign thickness (mm) of butt weld, h_e＝10mm；l_wWeld length, /)_w＝4*100＝400mm；f_f ^w-tensile, compressive and shear strength indices for fillet weld design, f_f ^w＝160N/mm²；

And obtaining the welding seam strength of the special lifting appliance according to a formula N which is mg; wherein g is 10 m/s; m is the welding seam strength of the special sling.

Further, the method for testing the strength of the lug plate of the special lifting appliance comprises the following steps:

according to the formula sigma N/2tb₁F and formula b₁＝min{2t+16，b-d₀/3}, obtaining the tension at the ear plate hole;

t is the thickness of the lifting lug, and t is 20 mm; d₀Ear plate hole diameter, d₀50 mm; b, connecting the two side edges of the lifting lug with the edge of the shaft hole, wherein b is 50 mm; f is the strength index for designing the steel, wherein f is 120;

and according to formula N₁＝m₁g, obtaining the strength of the lug plate of the special lifting appliance; wherein g is 10 m/s; m is₁The lug plate strength of the special sling.

Further, in the third step, a three-point hoisting method is adopted, three special lifting appliances are uniformly arranged on three threaded holes of the upper pressing cylinder, and each special lifting appliance is fixed.

Furthermore, in the fourth step, at least one steel wire rope is arranged, and at least two steel wire ropes are arranged on the chain block;

the crane hook is provided with one steel wire rope and one chain block, and the rolling stand is provided with one chain block.

Further, in step five, the hoisting of the cylinder comprises: pre-hoisting and formal hoisting;

in the pre-hoisting process, adjusting each chain block and the steel wire rope to balance the pressing cylinder;

and in the formal hoisting, hoisting the upper pressing cylinder, and in the hoisting process, controlling the balance of the upper pressing cylinder by adjusting each chain block.

Further, the special spreader comprises:

the lug plate is provided with a through hole, the lug plate is provided with a through groove, and the length direction of the through groove is vertical to the axial direction of the through hole;

one end of the threaded rod is fixedly arranged in the through groove of the lug plate;

and the nut is connected to the threaded rod in an adaptive manner.

The application has the following beneficial effects:

the application provides a rolling mill pressure cylinder installation method in restricted space, sets up on pressing the cylinder through special lifting device to utilize chain block and wire rope, connect and hoist on the driving, and can make pressure cylinder balance through adjusting the chain block, and then ensure that the pressure cylinder can be safe and stable's installation target in place.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.

FIG. 1 is a schematic flow chart of a method for installing a press cylinder of a rolling mill in a limited space according to an embodiment of the invention;

fig. 2 is a front view of a special spreader provided according to an embodiment of the present invention;

fig. 3 is a side view of a special spreader provided in accordance with an embodiment of the present invention;

FIG. 4 is a front view of a push-up cylinder provided in accordance with an embodiment of the present invention;

FIG. 5 is a top view of a push-up cylinder provided in accordance with an embodiment of the present invention.

Wherein, 1-ear plate, 2-threaded rod, 3-upper pressing cylinder and 4-threaded hole.

Detailed Description

Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.

Referring to fig. 1 to 5, the present application provides a rolling mill upper cylinder mounting method in a confined space, including: the method comprises the following steps that firstly, construction information is obtained, and a plurality of special lifting appliances are arranged according to the construction information; step two, the overall strength of each special lifting appliance is inspected; thirdly, arranging a plurality of special lifting appliances on a hydraulic cylinder; fourthly, arranging steel wire ropes and chain blocks on the crane hook and the rolling mill frame, and respectively connecting the steel wire ropes and the chain blocks to the special lifting appliances; and step five, adjusting the chain block, driving the traveling crane to lift, and controlling the balance of the upper pressing cylinder 3 in real time until the upper pressing cylinder 3 is installed in place. And sixthly, separating each steel wire rope and each inverted chain from the special lifting appliance, and dismantling each special lifting appliance.

The weight of the upper pressing cylinder 3 of the rolling mill is up to 4 tons or even higher, the upper pressing cylinder cannot be installed by manual force, and after the rolling mill frame and the upper cross beam are installed, a travelling crane in a workshop can cause position interference and cannot be hoisted. Therefore, in this embodiment, the lifting is performed by adopting a multi-lifting-point, traveling crane and chain block matching manner, so that the traveling crane in the workshop can play the maximum role, the chain block can be used for keeping the balance of the upper pressing cylinder 3, and finally the upper pressing cylinder 3 can be safely and stably installed in place.

The method for installing the upper cylinder of the rolling mill in the limited space will be described in detail through embodiments.

In the first step, the construction information includes: weight and size of the press-up cylinder 3, and mounting position size information of the press-up cylinder 3. The strength of the special lifting appliance is designed according to the weight of the upper pressing cylinder 3, and the special lifting appliance is guaranteed to have enough strength to lift the upper pressing cylinder 3. And setting the lengths of the chain block and the steel wire rope according to the size of the pressing cylinder 3 and the size information of the installation position on the pressing cylinder 3. Therefore, the adjustment of the upper pressing cylinder 3 can be achieved by adjusting the chain block and/or the steel wire rope, and the stable installation of the upper pressing cylinder 3 can be guaranteed.

In the second step, the method for testing the strength of each special lifting appliance comprises the following steps: inspecting the welding seam strength of each special lifting appliance; and testing the strength of the lug plate of each special lifting appliance.

The method for testing the welding seam strength of each special lifting appliance comprises the following steps: according to the formula τ_f＝N/h_el_w≤f_f ^wObtaining the axial tension or axial pressure N of the welding seam; wherein N is the axial tension or axial pressure (N) of the weld; h is_e-the design thickness (mm) of the butt weld; l_w-length of weld; f. of_f ^w-tensile, compressive and shear strength indexes for fillet weld design; in the present embodiment, h_e＝10mm，l_w＝4*100＝400mm，f_f ^w＝160N/mm²Calculating to obtain the axial tension or axial pressure N of the traveling wind which is 640 KN; then according to the formula N-mg, wherein g-10 m/s; and m represents the weld joint strength of the special lifting appliance, so that the weld joint strength m of the special lifting appliance is 64 tons. On the contrary, the axle center ultimate tension or the axle center ultimate pressure of the welding seam can be obtained through the ultimate strength of the welding seam of the special lifting appliance, so that the special lifting appliance is designed, and the safety can be ensuredSo as to make the axial tension (axial pressure) of the welding seam more than one time of axial limit tension (axial limit pressure).

The method for testing the strength of the lug plate of the special lifting appliance comprises the following steps: according to the formula sigma-N₁/2tb₁F and formula b₁＝min{2t+16，b-d₀/3}, wherein t is the thickness of the lifting lug; d₀-ear plate hole diameter; b, connecting the two side edges of the lifting lug with the net distance of the edge of the shaft hole; f, designing strength index of steel; in this embodiment, t is 20mm, d₀50mm, using a steel Q235 f of 120; obtaining tension N at the ear plate hole₁159.84 KN; then according to formula N₁＝m₁g, wherein g is 10 m/s; m is₁-the lug plate strength of the spreader, m ═ 16 tons, is obtained. On the contrary, the ultimate tension of the lug plate hole can be obtained through the lug plate ultimate strength of the special lifting appliance, and then the special lifting appliance is designed, so that the ultimate tension of the lug plate hole can be more than one time greater than that of the lug plate hole for ensuring the safety.

In the present embodiment, referring to fig. 2 and 3, the special spreader includes: the ear plate 1 is provided with a through hole, the through hole is an ear plate hole, the ear plate 1 is provided with a through groove, and the length direction of the through groove is vertical to the axial direction of the through hole; one end of the threaded rod 2 is fixedly arranged in the through groove of the ear plate 1; and the nut is matched and connected on the threaded rod 2.

In this embodiment, the net distance between the two side edges of the ear plate 1 and the edge of the axle hole is the same as the minimum distance between the edge of the axle hole and the edge of the plate. Therefore, the tensile (splitting) strength of the end interface of the lug plate 1 of the lifting appliance and the shear strength of the lug plate 1 do not need to be checked. Therefore, the designed lifting appliance can bear the lifting weight of 16 tons at most through the verification calculation.

In the third step, a three-point hoisting method is adopted, three special lifting appliances are uniformly arranged on three threaded holes 4 of the upper cylinder 3, and each special lifting appliance is fixed. Specifically, the threaded rod 2 of the lifting appliance extends into the threaded hole 4 of the upper cylinder 3, and the nut is mounted at one end, penetrating out of the threaded hole 4, of the threaded rod 2, so that the special lifting appliance is fixed. As will be appreciated by those skilled in the art, when the nut is installed, a spacer is installed between the nut and the upper cylinder 3 to prevent damage to the upper cylinder 3 by the nut and the spreader during the hoisting process.

In the fourth step, at least one steel wire rope is arranged, and at least two inverted chains are arranged; the crane hook is provided with one steel wire rope and one chain block, and the rolling stand is provided with one chain block. It should be understood that the upper cylinder 3 is lifted, the upper cylinder 3 is displaced horizontally by adjusting the chain block, and then the upper cylinder 3 is mounted below.

In the fifth step, the hoisting of the upper pressing cylinder 3 comprises: pre-hoisting and formal hoisting; in the pre-hoisting process, each chain block and the steel wire rope are adjusted to balance the upper pressing cylinder 3; avoid directly lifting by crane, the sudden tenesmic problem of jar 3 appears pressing, and then guarantee safe construction. In formal lifting, the upper pressing cylinder 3 is lifted, and in the lifting process, the balance of the upper pressing cylinder 3 is controlled by adjusting each chain block. Because there are the ascending removal of vertical and horizontal direction in the hoist and mount operation of pressing jar 3 to make wire rope and chain block can exist with the ascending angular variation of vertical direction, consequently, need real-time adjusting wire rope and chain block.

The application provides a rolling mill pressure cylinder installation method in restricted space, sets up on pressure cylinder 3 through special lifting device to utilize chain block and wire rope, connect and hoist on the driving, and can make pressure cylinder 3 balanced through adjusting the chain block, and then ensure that pressure cylinder 3 can be safe and stable's installation target in place.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.