Special tool for mounting base plate at bottom of lower supporting roll bearing seat

Abstract

The invention provides a special tool for mounting a base plate at the bottom of a lower supporting roll bearing seat, which relates to the technical field of rolling mill roll system assembly and comprises a supporting base, universal wheels arranged at the bottom of the supporting base, a hydraulic telescopic mechanism arranged at the upper part of the supporting base and an elastic supporting mechanism arranged at the upper part of the hydraulic telescopic mechanism, an internal spring is arranged in the elastic supporting mechanism, a limiting mechanism for preventing the base plate from displacing from the upper portion of the elastic supporting mechanism is arranged on the upper portion of the elastic supporting mechanism, and a fixing mechanism for fixing the lowest moving position of the limiting mechanism is arranged on the side portion of the elastic supporting mechanism. The cushion block can move in the horizontal direction and the vertical direction, whether the cushion plate is installed in place or not is determined through the elastic supporting mechanism, the situation that the cushion plate to be installed is pressed and damaged is prevented while the installation quality is guaranteed, and the installation efficiency of the cushion block and the safety of the installation process are further improved by arranging the limiting mechanism.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rolling mill roll system assembly, and particularly relates to a special tool for installing a bottom pad plate of a lower supporting roll bearing seat. BACKGROUND

[0002] A rolling mill is a core equipment in the field of steel and non-ferrous metal processing, and its core role is to perform rolling processing on metal blanks (such as steel blanks, aluminum blanks, etc.) through mechanical pressure: on the one hand, it can realize forming function, and can roll thick original blanks into plate materials (such as steel plates, aluminum foils), profile materials (such as H-shaped steel, angle steel), wire materials (such as building steel bars), pipe materials (such as seamless steel pipes), and other various forms and specifications of finished materials to meet the diversified needs of industries such as infrastructure, machinery, automobiles and chemical industry; on the other hand, it can optimize material performance, and by adjusting rolling temperature, pressure, cooling speed and other processes, it can refine metal internal grains, compact internal defects, improve material strength, hardness and toughness, and improve plasticity and weldability to adapt to performance requirements in different scenarios; in addition, the rolling mill (especially continuous rolling mill unit) can also realize large-scale and efficient production, greatly improve the output of metal materials (such as a set of hot continuous rolling mill unit with an annual output of millions of tons), reduce production cost, and become a key link connecting metal raw materials and industrial finished materials.

[0003] There are mainly two methods for installing the bottom pad plate of the lower supporting roll bearing of the existing rolling mill: one is to use steel wire rope and lifting belt to lift the pad plate for hoisting, which has poor positioning accuracy and stability, low installation efficiency, high lifting risk and suspected illegal operation; the other is to use a fixed support to support the pad plate to hoist the bearing seat and then install them by falling, which has poor flexibility and cannot determine whether the pad plate is installed in place in time, and the bearing seat may be pressed too much to damage the pad plate or the support. SUMMARY

[0004] In order to solve the technical problems of poor positioning accuracy, poor flexibility, low installation efficiency and high risk in the installation process of the pad plate in the prior art, the present application provides a special tool for installing the bottom pad plate of the lower supporting roll bearing seat.

[0005] The special tool for installing the bottom pad plate of the lower supporting roll bearing seat provided by the present application adopts the following technical scheme: A special tool for installing the bottom pad plate of the lower supporting roll bearing seat, comprising a supporting base, universal wheels arranged at the bottom of the supporting base to drive the supporting base to move, a hydraulic telescopic mechanism arranged at the upper part of the supporting base, and an elastic supporting mechanism arranged at the upper part of the hydraulic telescopic mechanism, wherein the elastic supporting mechanism is internally provided with an internal spring for installing the pad plate in place and preventing the pad plate from being damaged, a limiting mechanism is arranged at the upper part of the elastic supporting mechanism to prevent the pad plate from being displaced from the upper part of the elastic supporting mechanism, and a fixing mechanism is arranged at the side of the elastic supporting mechanism to fix the lowest position of the movement of the limiting mechanism.

[0006] By adopting the technical scheme, the universal wheel and the hydraulic telescopic mechanism are arranged to enable the cushion block to move horizontally and vertically, the cushion plate is quickly adjusted to the installation position, and whether the cushion plate is installed in place is confirmed by the elastic support mechanism, so that the installation quality is ensured and the cushion plate to be installed is prevented from being damaged by being pressed, the installation efficiency of the cushion block and the safety of the installation process are further improved by arranging the limiting mechanism, and the lowest position of the limiting mechanism is fixed by the fixing mechanism to prevent the limiting mechanism from interfering with the installation tool of the cushion block.

[0007] Further, a handle is arranged at one side end of the supporting base.

[0008] By adopting the technical scheme, the user holds the handle to move the supporting base, the supporting base drives the elastic support mechanism to move, and the elastic support mechanism drives the cushion plate to move to the position to be installed.

[0009] Further, the structure of the hydraulic telescopic mechanism comprises a hydraulic cylinder screwed on the upper part of the supporting base and a lifting base fixedly arranged on the top of the hydraulic cylinder.

[0010] By adopting the technical scheme, the hydraulic cylinder is started, the hydraulic cylinder drives the lifting base to move vertically upward, and the lifting base drives the elastic support mechanism to move upward, so that the cushion plate on the elastic support mechanism can move upward along the vertical direction during installation.

[0011] Further, the number of the hydraulic cylinders is multiple.

[0012] By adopting the technical scheme, the stability of the lifting base during movement is improved. Further, the elastic support mechanism comprises a supporting sleeve welded on the lifting base, a supporting rod slidingly arranged in the supporting sleeve, a boss arranged around the inner wall of the supporting sleeve, a stopper arranged around the outer wall of the supporting rod, the stopper being arranged at the bottom of the upper wall of the supporting sleeve, an internal spring arranged between the stopper and the boss, and the internal spring being sleeved on the outside of the supporting rod.

[0013] By adopting the technical scheme, the compression of the internal spring is determined by observing the downward movement of the supporting rod during installation, so that the installation contact of the cushion plate is confirmed, and the top of the supporting rod and the cushion plate to be installed are protected from being damaged by being pressed.

[0014] Further, the number of the supporting sleeves is multiple, a reinforcing rib is welded between the adjacent two supporting sleeves, and the bottom of the reinforcing rib is welded and fixed to the upper part of the lifting base.

[0015] By adopting the technical scheme, the supporting strength of the tooling is improved, and the stability of the cushion plate during movement is improved.

[0016] Further, the side of the supporting sleeve is provided with a window.

[0017] By using the above technical scheme, the lowering of the bottom of the supporting rod can be observed through the window during installation.

[0018] Further, the limiting mechanism comprises a limiting plate sleeved on the upper part of the supporting rod, the upper end of the supporting rod is provided with a fixing ring, and the limiting plate is arranged at the lower part of the fixing ring; further comprising an external spring arranged between the bottom of the limiting plate and the top of the supporting sleeve, the external spring is sleeved on the outside of the supporting rod, and the limiting plate is provided with a limiting lug on the upper part.

[0019] By using the above technical scheme, the bottom of the limiting plate is in contact with the bottom of the fixing ring under the elastic force of the external spring, and the limiting lug on the upper part of the limiting plate stops the position of the outer wall of the to-be-installed pad plate on the elastic supporting mechanism, preventing the to-be-installed pad plate from being displaced from the upper part of the elastic supporting mechanism during movement.

[0020] Further, the fixing mechanism comprises a limiting box fixedly arranged on the side of the supporting sleeve, the bottom of the limiting plate extends downward and has a connecting plate, the connecting plate is slidingly arranged in the limiting box, the bottom of the limiting box is rotatably connected with a rotating piece, the upper end of the rotating piece is provided with a fixing pin after penetrating through the bottom wall of the limiting box, the bottom of the connecting plate is provided with a connecting pin matched with the fixing pin, and an opening for observing the rotating position of the fixing pin is arranged at the bottom of the limiting box.

[0021] By using the above technical scheme, when the limiting mechanism is not used, the user can move the limiting plate downward, so that the connecting pin in the connecting plate moves to the lower end inside the limiting box, then the rotating piece is rotated, so that the fixing pin is rotated above the connecting pin, under the elastic force of the external spring, the connecting pin and the fixing pin are clamped with each other, the position of the limiting plate is fixed, and the interference between the pad plate and the limiting mechanism during installation is prevented.

[0022] Further, the side of the limiting plate is provided with a push plate facilitating the downward movement of the limiting plate.

[0023] By using the above technical scheme, the limiting plate can be moved downward by pressing the push plate downward, so that the connecting pin in the connecting plate moves to the lower end inside the limiting box, and the connecting pin and the fixing pin are clamped with each other, so as to fix the position of the limiting plate.

[0024] In summary, the beneficial effects of the present application are: 1.The present application sets up hydraulic telescopic mechanism, elastic support mechanism and universal wheel, when using, the to-be-installed cushion plate is hoisted horizontally on the upper part of the support rod, the tool is driven by the universal wheel at the bottom of the support base to move and align the installation slot position at the bottom of the bearing seat, the hydraulic cylinder is started to lift the cushion plate and make it contact with the installation slot surface at the bottom of the bearing seat, and the support rod is observed through the window to judge whether the cushion plate is in close contact with the bottom surface of the bearing seat, and then the subsequent bolt installation and fastening work of the cushion plate is carried out, after the installation is completed, the hydraulic cylinder is started again to lower the tool top surface height and pull out horizontally from below the bearing seat, and the installation of the cushion plate is completed.The present application can move the cushion block horizontally and vertically, quickly adjust the cushion plate to the installation position, and confirm whether the cushion plate is installed in place through the elastic support mechanism, which ensures the installation quality and prevents the to-be-installed cushion plate from being damaged by being pressed.

[0025] 2.By setting the limiting mechanism and the fixing mechanism, when installing the cushion plate, the to-be-installed cushion plate is placed on the upper part of the support rod, the outer wall position of the to-be-installed cushion plate is stopped by the limiting protrusion on the upper part of the limiting plate during movement, preventing the to-be-installed cushion plate from moving from the upper part of the elastic support mechanism during movement, improving the installation efficiency of the cushion plate, and further preventing the cushion plate from falling.When the cushion plate is installed upward, the limiting plate is in contact with the bottom of the bearing seat of the lower supporting roller, and after extruding the external spring, it moves downward to prevent the limiting plate from interfering with the installation of the cushion plate.When the limiting mechanism is not used, the user can press the push plate downward, so that the connecting pin in the connecting plate moves to the lower end inside the limiting box, then rotates the rotating piece, so that the fixing pin is rotated above the connecting pin, under the action of the elastic force of the external spring, the connecting pin and the fixing pin are clamped with each other, the position of the limiting plate is fixed, and the installation tool and the limiting mechanism are prevented from interfering with each other during installation.The present application further improves the installation efficiency of the cushion plate and the safety of the installation process through the above structure. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a schematic diagram of the top view of the present application; Figure 3 It is a schematic diagram of the present applicationFigure 2 Part B-B section view; Figure 4 For the present invention Figure 3 Part D enlarged view; Figure 5 For the present invention Figure elastic support mechanism, limit mechanism and fixed mechanism of the explosion diagram; Figure 6 For the present invention Figure 1 Part C enlarged view; Figure 7 For the present invention Figure 2 Part A-A section view; Figure 8 For the present invention Figure 7 Part E enlarged view.

[0027] In the figure: 2, hydraulic telescopic mechanism; 3, elastic support mechanism; 4, limit mechanism; 5, fixed mechanism; 11, support base; 12, universal wheel; 13, handle; 21, lifting base; 22, hydraulic cylinder; 31, support sleeve; 32, window; 33, reinforcing rib; 34, support rod; 35, internal spring; 41, limit plate; 42, fixed ring; 43, external spring; 51, limit box; 52, connecting plate; 53, rotating piece; 311, boss; 341, stop table; 411, push plate; 511, opening; 521, connecting pin; 531, fixed pin. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with specific embodiments, the illustrative embodiments of the present invention and the description used to explain the present invention, but not as a limitation on the present invention.

[0029] Referring to Figure 1 The first embodiment of the present invention, disclosed a kind of lower supporting roller bearing seat bottom pad mounting special tool, including support base 11, the support base 11 is square plate structure;Universal wheel 12 is arranged in the bottom of support base 11 and drives support base 11 to move, the number of universal wheel 12 is four, respectively arranged in the position of four corner of the bottom of support base 11, realize flexible movement on the horizontal plane of entire tool, handle 13 is arranged in one side end of support base 11, user holds handle 13 can move support base 11 to suitable position;It also includes hydraulic telescopic mechanism 2 arranged on the upper portion of support base 11 and elastic support mechanism 3 arranged on the upper portion of hydraulic telescopic mechanism 2, when using, pad is placed in the upper portion of elastic support mechanism 3, support base 11 is pushed to the position of supporting roller bearing seat bottom needing to install pad, the installation height of pad is adjusted by hydraulic telescopic mechanism 2, and whether pad is installed in place can be confirmed by elastic support mechanism 3, while guaranteeing installation quality, prevent pad from being damaged by being pressed.

[0030] Specifically, the structure of the hydraulic telescopic mechanism 2 comprises a hydraulic cylinder 22 screwed on the upper part of the support base 11 and a lifting base 21 fixedly arranged on the top of the hydraulic cylinder 22, wherein, as a preferred, the lifting base 21 is a quadrilateral plate structure, and the number of the hydraulic cylinders 22 is four, which are symmetrically arranged at the four corners of the bottom of the lifting base 21. In use, the hydraulic cylinders 22 are started to drive the lifting base 21 to move vertically upward, and the lifting base 21 drives the elastic support mechanism 3 to move upward, so that the base plate on the elastic support mechanism 3 can move upward along the vertical direction during installation.

[0031] Moreover, referring to FIG. 1, Figures 1-5 As shown in the figure, the elastic support mechanism 3 comprises a support sleeve 31 welded on the lifting base 21, wherein, as a preferred, the number of the support sleeves 31 is four, which are respectively arranged at the four corners of the lifting base 21. In order to increase the firmness of the four support sleeves 31 during use, a reinforcing rib 33 is welded between the two adjacent support sleeves 31, and the bottom of the reinforcing rib 33 is welded and fixed with the upper part of the lifting base 21.

[0032] It also comprises a support rod 34 slidingly arranged in the support sleeve 31, the upper part of the support rod 34 is a conical structure, which can also be adjusted to a square, spherical structure, etc. according to the actual use, a boss 311 is arranged around the inner wall of the support sleeve 31, and a stop 341 is arranged around the outer wall of the support rod 34, which is arranged at the bottom of the upper wall of the support sleeve 31; an internal spring 35 is arranged between the stop 341 and the boss 311, which is sleeved outside the support rod 34, and under the elastic force of the internal spring 35, the stop 341 in the support rod 34 is connected to the lower part of the top wall of the support sleeve 31. The side of the support sleeve 31 is provided with a window 32, through which the downward movement of the bottom of the support rod 34 is observed during installation, the compression of the internal spring 35 is judged, the installation contact of the base plate is confirmed, and at the same time, the top of the support rod 34 and the to-be-installed base plate are protected from being damaged by being pressed.

[0033] Moreover, the internal spring 35 needs to provide an elastic force greater than the weight of the base plate within the limit compression amount, and the structure for judging the contact of the base plate with the bottom installation surface of the bearing seat during installation is not limited to the internal spring 35, but can also be a disc spring, a mechanical structure, etc. which can bear a force greater than the weight of the base plate and change in total length after being stressed. The lifting of the upper structure of the tool is not limited to the hydraulic cylinder 22, but can also use a structure or device which can realize the stable movement of the upper structure in the vertical direction. The support base 11, the lifting base 21, the support sleeve 31 and the support rod 34 are all composed of high-strength steel.

[0034] When installing the base plate at the bottom of the lower supporting roller bearing seat, the base plate to be installed is hoisted horizontally at the upper part of the supporting rod 34, the tooling is driven by the universal wheel 12 at the bottom of the supporting base 11 to move and align the base plate to the installation slot position at the bottom of the bearing seat, the base plate is lifted to contact the installation slot surface at the bottom of the bearing seat by starting the hydraulic cylinder 22, the force lowering height of the supporting rod 34 (i.e. the force compression of the internal spring 35) is observed through the window 32 to determine whether the base plate is in close contact with the bottom surface of the bearing seat, and then the subsequent base plate bolt installation and fastening operation is performed, after the installation is completed, the tooling top surface height is lowered again by starting the hydraulic cylinder 22, and the tooling is pulled out horizontally from below the bearing seat to complete the installation of the base plate.

[0035] The tooling can quickly adjust the base plate to the installation position through horizontal and vertical movement, thereby performing the subsequent bolt installation operation, and can confirm whether the base plate is installed in place through the elastic support mechanism 3, thereby preventing the base plate to be installed from being damaged by being pressed.

[0036] The tooling for the base plate installation at the bottom of the lower supporting roller of the medium plate and hot continuous rolling mill can lift the base plate to be installed by the supporting rod 34 and the internal spring 35, and confirm the contact condition of the base plate with the bottom of the bearing seat during the installation process, and finally improve the base plate installation efficiency and safety during the installation process by the bottom universal wheel 12 and the middle hydraulic telescopic mechanism 2 to realize the positioning of the base plate to be installed and the installation slot at the bottom of the bearing seat.

[0037] Moreover, the tooling and the use method thereof designed in the present application have the effects of high flexibility, high installation precision, and significant improvement of installation efficiency and safety during the installation process compared with the existing base plate installation method. Compared with the method of hoisting the base plate by using a steel wire rope and a lifting belt and supporting the base plate by a fixed support, the tooling can more flexibly and efficiently lift the base plate to be installed to align and fit the installation position at the bottom of the bearing seat, and will not have the installation risks such as inclination and falling of the base plate, thereby shortening the installation time of the original installation method by more than half, ensuring the safety of the subsequent bolt connection and fastening operation of the base plate and the bearing seat by workers, and preventing the tooling from being damaged due to excessive instantaneous force during the installation process, thereby having a long service life. Referring to Figure 1 As shown in the second embodiment, a limiting mechanism 4 is arranged at the upper part of the elastic support mechanism 3 to prevent the base plate to be installed from being displaced from the upper part of the elastic support mechanism 3 during the movement, and a fixing mechanism 5 is arranged at the side part of the elastic support mechanism 3 to fix the lowest position of the movement of the limiting mechanism 4. When the base plate is installed, the four edges of the base plate are limited by the limiting mechanism 4 to prevent the base plate from being displaced from the upper part of the elastic support mechanism 3 during the movement, thereby improving the installation efficiency of the base plate, and when the limiting mechanism 4 is not needed to be used, the limiting mechanism 4 is fixed at the lowest position of the downward movement by the fixing mechanism 5 to prevent the installation tool from interfering with the limiting mechanism 4 during the installation of the base plate.

[0038] Specifically, referring to Figures 5-8 The limiting mechanism 4 includes a limiting plate 41 sleeved on the upper portion of the supporting rod 34, the upper end of the supporting rod 34 is provided with a fixing ring 42, and the limiting plate 41 is arranged at the lower portion of the fixing ring 42. An external spring 43 is arranged between the bottom of the limiting plate 41 and the top of the supporting sleeve 31, the external spring 43 is sleeved on the outside of the supporting rod 34, the limiting plate 41 is in contact with the bottom of the fixing ring 42 under the elastic force of the external spring 43, the limiting plate 41 is provided with a limiting protrusion on the upper portion, the limiting protrusion on the upper portion of the limiting plate 41 is used for stopping the position of the outer wall of the pad to be installed on the elastic force supporting mechanism 3, and the displacement of the pad to be installed from the upper portion of the elastic force supporting mechanism 3 during movement is prevented.

[0039] Furthermore, the fixing mechanism 5 includes a limiting box 51 fixedly arranged on the side portion of the supporting sleeve 31, the bottom of the limiting plate 41 extends downward and is provided with a connecting plate 52, the connecting plate 52 is slidingly arranged in the limiting box 51, the bottom of the limiting box 51 is rotationally connected with a rotating piece 53, the upper end of the rotating piece 53 penetrates through the bottom wall of the limiting box 51 and is provided with a fixing pin 531, the bottom of the connecting plate 52 is provided with a connecting pin 521 matched with the fixing pin 531, the bottom of the limiting box 51 is provided with an opening 511 for observing the rotating position of the fixing pin 531, the fixing pin 531 and the connecting pin 521 are connected with each other by moving the limiting plate 41 downward and rotating the rotating piece 53, the moving position of the limiting plate 41 is fixed, and the side portion of the limiting plate 41 is provided with a push plate 411 facilitating the downward movement of the limiting plate 41.

[0040] When the pad is installed, the pad to be installed is placed on the upper portion of the supporting rod 34, the position of the outer wall of the pad to be installed is stopped by the limiting protrusion on the upper portion of the limiting plate 41 during movement, the displacement of the pad to be installed from the upper portion of the elastic force supporting mechanism 3 during movement is prevented, the installation efficiency of the pad is improved, and the falling of the pad is further prevented, when the pad is installed upward, the limiting plate 41 is in contact with the bottom of the lower supporting roller bearing seat, the external spring 43 is extruded and then moves downward, the installation of the pad by the limiting plate 41 is prevented from being interfered, when the limiting mechanism 4 is not used, the user can press the push plate 411 downward, the connecting pin 521 in the connecting plate 52 is moved to the lower end inside the limiting box 51, then the rotating piece 53 is rotated, the fixing pin 531 is rotated to be above the connecting pin 521, the connecting pin 521 and the fixing pin 531 are connected with each other under the elastic force of the external spring 43, the position of the downward movement of the limiting plate 41 is fixed, and the installation tool is prevented from interfering with the limiting mechanism 4 during the installation of the pad.

[0041] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. The various components mentioned in the present application are common techniques in the prior art, and those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A special tool for installing the bottom pad of a lower backup roll chock, comprising a support base (11), universal wheels (12) arranged at the bottom of the support base (11) to move it, characterized in that, It also includes a hydraulic telescopic mechanism (2) arranged on the upper part of the support base (11) and a elastic support mechanism (3) arranged on the upper part of the hydraulic telescopic mechanism (2), the elastic support mechanism (3) is internally provided with an internal spring (35) for installing the cushion plate in place and preventing the cushion plate from being damaged, a limiting mechanism (4) is arranged on the upper part of the elastic support mechanism (3) to prevent the cushion plate from being displaced from the upper part of the elastic support mechanism (3), and a fixing mechanism (5) is arranged on the side of the elastic support mechanism (3) to fix the lowest position of the movement of the limiting mechanism (4).

2. The special tool for installing the bottom pad of the bearing housing of the lower support roll according to claim 1, characterized in that, A handle (13) is arranged on one side end of the support base (11).

3. The special tool for installing the bottom pad of the bearing housing of the lower support roll according to claim 1, characterized in that, The structure of the hydraulic telescopic mechanism (2) comprises a hydraulic cylinder (22) screwed on the upper part of the support base (11) and a lifting base (21) fixedly arranged on the top of the hydraulic cylinder (22).

4. The bottom pad mounting tool for a lower backup roll bearing housing according to claim 3, characterized in that, The number of the hydraulic cylinder (22) is multiple.

5. The bottom pad mounting tool for the lower backup roll bearing housing according to claim 3, characterized in that, The elastic support mechanism (3) comprises a support sleeve (31) welded on the lifting base (21); a support rod (34) slidingly arranged in the support sleeve (31), a boss (311) arranged around the inner wall of the support sleeve (31), a stop (341) arranged around the outer wall of the support rod (34), the stop (341) arranged at the bottom of the upper wall of the support sleeve (31); an internal spring (35) arranged between the stop (341) and the boss (311), the internal spring (35) sleeved on the outside of the support rod (34).

6. The bottom pad mounting tool for a lower backup roll bearing housing according to claim 5, characterized in that, The number of the support sleeve (31) is multiple, and a reinforcing rib (33) is welded between adjacent two support sleeves (31), and the bottom of the reinforcing rib (33) is welded and fixed with the upper part of the lifting base (21).

7. The bottom pad mounting tool for a lower backup roll bearing housing according to claim 6, characterized in that, The side of the support sleeve (31) is provided with a window (32).

8. The bottom pad mounting tool for a lower backup roll bearing housing according to claim 5, characterized in that, The limiting mechanism (4) comprises a limiting plate (41) sleeved on the upper part of the support rod (34), the upper end of the support rod (34) is provided with a fixing ring (42), and the limiting plate (41) is arranged below the fixing ring (42); further comprising an external spring (43) arranged between the bottom of the limiting plate (41) and the top of the support sleeve (31), the external spring (43) is sleeved on the outside of the support rod (34), and the limiting plate (41) is provided with a limiting lug.

9. The bottom pad mounting tool for a lower backup roll bearing housing according to claim 8, characterized in that, The fixing mechanism (5) comprises a limiting box (51) fixedly arranged on the side of the support sleeve (31), the bottom of the limiting plate (41) extends downwardly to have a connecting plate (52), the connecting plate (52) is slidingly arranged in the limiting box (51), the bottom of the limiting box (51) is rotationally connected with a rotating piece (53), the upper end of the rotating piece (53) is provided with a fixed pin (531) after penetrating through the bottom wall of the limiting box (51), the bottom of the connecting plate (52) is provided with a connecting pin (521) matched with the fixed pin (531), and an opening (511) is arranged on the bottom of the limiting box (51) to observe the rotating position of the fixed pin (531).

10. The bottom pad mounting tool for a lower backup roll bearing housing according to claim 8, characterized in that, The side of the limiting plate (41) is provided with a push plate (411) for facilitating the downward movement of the limiting plate (41).

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