A drag out roller lift device that is easy to maintain

Abstract

The utility model relates to the technical field of metallurgical mechanical equipment discloses a drag out roller lifting device convenient to maintain, including machine outside centring base and drag out roller support still include rotation transmission mechanism and lifting drive unit, the drag out roller support rotatablely connects on machine outside centring base through a rotating shaft, the rotation transmission mechanism includes a transmission axle, a swing arm and at least one bearing seat, the transmission axle is fixedly installed on the upper plane of machine outside centring base through bearing seat, one end of swing arm is fixedly covered on the transmission axle, and the other end is hinged with the bottom of drag out roller support, this drag out roller lifting device convenient to maintain, through the linear thrust of oil cylinder conversion is the rotary torque to transmission axle, oil cylinder no longer directly bears the partial load and impact load of drag out roller base, and the working condition is fundamentally improved.

Description

Technical Field

[0001] This utility model relates to the technical field of metallurgical machinery and equipment, and in particular to a pull-out roller lifting device that is easy to maintain. Background Technology

[0002] Accu-Roll tube rolling mill: The lifting mechanism for the pull-out roll in the back of the piercing mill has a hydraulic cylinder installed directly below the pull-out roll. The pull-out roll base is pushed and pulled, and the pull-out roll slides up and down on the guide rail through the linear bearing on the side to achieve lifting and lowering of the pull-out roll. This mechanism has dense equipment, hidden vulnerable parts, and is time-consuming and labor-intensive to maintain.

[0003] Firstly, the hydraulic cylinder is located directly below the capillary tube, which reaches temperatures as high as 1100°C when it exits the piercing machine. Oil leakage from the cylinder or rupture of the hydraulic pipe can easily cause a fire. Secondly, the cylinder's seals deteriorate rapidly under high temperatures, leading to oil leaks within a short time, and the hydraulic pipes frequently experience wear, rupture, and leakage. Furthermore, due to the dense arrangement of equipment behind the piercing machine and the concealed location of the hydraulic cylinder and hydraulic lines below the base of the pull-out roller, even if the hydraulic station issues a low oil level alarm, it is difficult to immediately locate the leak. During routine equipment inspections, the leak cannot be directly detected. Finally, replacing the hydraulic cylinder is time-consuming and labor-intensive, requiring the complete removal of the pull-out roller and base each time.

[0004] Because linear bearings require the use of guide rails, they can only be installed on the inner side of the pull-out roller base frame, making the installation location of the linear bearings concealed. This not only makes lubrication and inspection inconvenient but also makes replacement difficult, requiring the entire frame to be disassembled and the linear bearing slid off the guide rail each time. Secondly, during the hydraulic cylinder's push-pull lifting and lowering process, problems such as frame tilting and jamming, and damage to the linear bearings frequently occur. Furthermore, because the linear bearings are tightly fitted to the guide rails, reinstallation is difficult after replacing the linear bearings. Utility Model Content

[0005] In view of the problems of existing hydraulic cylinders being prone to oil leakage in high-temperature areas, having long service life, and being prone to oil leakage, this utility model is proposed.

[0006] Therefore, the purpose of this utility model is to provide a pull-out roller lifting device that is easy to maintain. Its purpose is to convert the linear thrust of the hydraulic cylinder into the rotational torque on the transmission shaft, so that the hydraulic cylinder no longer directly bears the eccentric load and impact load of the pull-out roller base, and the working conditions are fundamentally improved.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a maintenance-friendly pull-out roller lifting device, including an external centering base and a pull-out roller bracket, and also including a rotary transmission mechanism and a lifting drive unit;

[0008] The external centering base is fixedly installed on the foundation;

[0009] The pull-out roller bracket is rotatably connected to the external centering base via a rotating shaft;

[0010] The rotary transmission mechanism includes a transmission shaft, a swing arm, and at least one bearing seat; the transmission shaft is fixedly mounted on the upper plane of the external centering base via the bearing seat; one end of the swing arm is fixedly sleeved on the transmission shaft, and the other end is hinged to the bottom of the traction roller bracket.

[0011] The cylinder of the lifting drive unit is mounted on the outside of the external centering base via a hydraulic cylinder fixing base; the piston rod end of the lifting drive unit is hinged to a drive crank arm, and the drive crank arm is fixedly sleeved on the end of the transmission shaft.

[0012] As a preferred embodiment of the easy-to-maintain pull-out roller lifting device of this utility model, the lifting drive unit is a hydraulic cylinder.

[0013] As a preferred embodiment of the easy-to-maintain pull-out roller lifting device of this utility model, the cylinder fixing base and the external centering base are separate structures and are fixed by bolts.

[0014] As a preferred embodiment of the easy-to-maintain pull-out roller lifting device of this utility model, the number of bearing seats is two, which are respectively installed at both ends of the transmission shaft.

[0015] As a preferred embodiment of the easy-to-maintain pull-out roller lifting device of this utility model, the bearing housing is a mounted spherical ball bearing.

[0016] As a preferred embodiment of the easy-to-maintain pull-out roller lifting device of this utility model, one end of the transmission shaft is further provided with a connecting structure of one of the following: a sprocket, a gear, or a coupling, for connecting an external drive device.

[0017] As a preferred embodiment of the easy-to-maintain pull-out roller lifting device of this utility model, the hinge point of the swing arm and the pull-out roller bracket, the center of the rotating shaft, and the pull-out roller mounting center line on the pull-out roller bracket together constitute a lever system.

[0018] As a preferred embodiment of the easy-to-maintain pull-out roller lifting device of this utility model, the installation angles of the drive crank arm and the swing arm on the transmission shaft differ by 90° to 180°.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] 1. This utility model converts the linear thrust of the hydraulic cylinder into rotational torque on the transmission shaft. The hydraulic cylinder no longer directly bears the eccentric load and impact load of the drag roller base, and the working conditions are fundamentally improved. Practice has proven that the service life of the hydraulic cylinder has been extended from the original 1-2 months to more than 1 year, which is more than 5 times the service life.

[0021] 2. In this utility model, the hydraulic cylinder is mounted on an independent base and has no direct mechanical connection to the entire traction roller bracket. When replacing the hydraulic cylinder, only the pins at both ends and the hydraulic lines need to be removed. No other large components need to be disassembled. A single person can complete the replacement within 1 hour, reducing the replacement time from 4 hours to 1 hour, and significantly reducing labor intensity and maintenance costs.

[0022] 3. This utility model completely eliminates the easily damaged linear guide rails and linear bearings, and uses a pure rotary motion pair to achieve the lifting function. The rotary motion pair has good wear resistance and high tolerance to harsh environments, fundamentally eliminating jamming and tilting phenomena during the lifting process, significantly reducing the equipment failure rate and improving the production efficiency.

[0023] 4. This utility model makes full use of existing equipment and only modifies the base part, resulting in low modification cost and high return on investment. It is particularly suitable for upgrading and modifying traditional drag roller devices. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the easy-to-maintain pull-out roller lifting device of this utility model.

[0025] Figure 2 This is a schematic diagram of the lifting drive unit structure of the easy-to-maintain drag roller lifting device of this utility model;

[0026] Figure 3 This is a schematic diagram of the pull-out roller support structure of the pull-out roller lifting device of this utility model, which is easy to maintain;

[0027] Figure 4 This is a schematic diagram of the overall external structure of the easy-to-maintain pull-out roller lifting device of this utility model.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Lifting drive unit; 2. Hydraulic cylinder mounting base; 3. Drive crank plate; 4. Transmission shaft; 5. Bearing seat; 6. External centering base; 7. Swing arm; 8. Drag roller bracket; 9. Rotary shaft; 10. Drag roller. Detailed Implementation

[0030] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0031] Example 1

[0032] Reference Figures 1-2 This is the first embodiment of the present invention, which provides an easy-to-maintain pull-out roller lifting device.

[0033] It includes an external centering base 6 and a pull-out roller bracket 8, as well as a rotary transmission mechanism and a lifting drive unit 1, clarifying that the lifting device consists of four major functional modules: foundation fixing, load bearing, transmission and execution.

[0034] The external centering base 6 is fixedly installed on the foundation, providing an independent, stable, and unaffected reference mounting plane that ensures the positioning accuracy and long-term operational stability of the entire lifting device, and facilitates independent debugging and maintenance;

[0035] The pull-out roller bracket 8 is rotatably connected to the external centering base 6 via a rotating shaft 9. The hinged connection provides a structural basis for subsequent lifting and lowering movements using the lever principle, ensuring the stability and uniqueness of the lifting and lowering trajectory and avoiding unnecessary swaying and jamming.

[0036] The rotary transmission mechanism includes a transmission shaft 4, a swing arm 7, and at least one bearing seat 5. The transmission shaft 4 is fixedly mounted on the upper plane of the external centering base 6 via the bearing seat 5. One end of the swing arm 7 is fixedly sleeved on the transmission shaft 4, and the other end is hinged to the bottom of the traction roller bracket 8, so that the transmission shaft of the power input component also has a stable and reliable support, ensuring the stability of the power transmission axis and reducing transmission errors and component wear caused by unstable support.

[0037] The swing arm converts the rotational motion of the transmission shaft into the lifting motion of the pull-out roller bracket. It is a key conversion component in the power transmission path, allowing the transmission of push and pull forces while adapting to changes in the rotation angle of the bracket, thus ensuring smooth movement.

[0038] The cylinder of the lifting drive unit 1 is mounted on the outside of the external centering base 6 via a hydraulic cylinder fixing base 2; the piston rod end of the lifting drive unit 1 is hinged to a drive crank arm 3, and the drive crank arm 3 is fixedly sleeved on the end of the transmission shaft 4.

[0039] This makes the drive unit, transmission mechanism and actuator form a complete and closed force transmission system. All forces and torques are balanced on this independent base, avoiding the transmission of additional stress to the main equipment, improving the operating accuracy and life of the main equipment. The linear thrust of the piston rod is effectively converted into torque to drive the transmission shaft to rotate through the drive crank arm. It is the power input end of the system, which also ensures efficient force transmission and adapts to the oscillation of the hydraulic cylinder.

[0040] The lifting drive unit 1 is a hydraulic cylinder. Using a hydraulic cylinder as a power source, it can provide huge thrust and smooth, controllable movement speed. It is especially suitable for lifting needs in heavy-duty applications and has overload protection capabilities, resulting in high system reliability.

[0041] The cylinder mounting base 2 and the external centering base 6 are separate structures and are fixed by bolts. If the cylinder needs to be repaired or replaced, the entire drive unit can be removed as a module by simply removing the connecting bolts on the cylinder mounting base. There is no need to disturb the main body of the external centering base or other precision parts. The maintenance work space is large and the operation is simple and quick.

[0042] There are two bearing housings 5, which are installed at both ends of the transmission shaft 4. They can effectively withstand the bending moment and torque transmitted by the drive crank arm and swing arm, prevent the shaft from deforming and vibrating, ensure the smoothness and accuracy of power transmission, and extend the service life of the transmission shaft and bearings.

[0043] Example 2

[0044] Reference Figures 1-4 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the bearing housing 5 is a mounted external spherical ball bearing. The mounted external spherical ball bearing has an automatic self-aligning function, which can compensate for the misalignment caused by installation errors or slight deflection of the transmission shaft, reduce the installation accuracy requirements, ensure that the bearing can operate smoothly even with slight deviations, and reduce abnormal wear.

[0045] One end of the transmission shaft 4 is also provided with a connection structure of one of the following: sprocket, gear, or coupling, for connecting an external drive device. It can be driven not only by the hydraulic cylinder of Embodiment 1, but also easily switched to be driven by a motor through a chain, gear, or direct coupling, thereby improving the adaptability of the device to different working conditions and user needs.

[0046] The hinge point of the swing arm 7 and the pull-out roller bracket 8, the center of the rotating shaft 9, and the installation center line of the pull-out roller 10 on the pull-out roller bracket 8 together form a lever system, which enables the device to pry the heavy pull-out roller and bracket with a small driving force cylinder thrust, optimizes the power configuration, improves energy efficiency, and makes the movement process more in line with mechanical principles, making it stable and reliable.

[0047] The installation angles of the drive crank arm 3 and the swing arm 7 on the transmission shaft 4 differ by 90° to 180°, which ensures that the hydraulic cylinder outputs maximum torque when it is in the optimal lever arm position, which is usually close to perpendicular to the crank arm. This provides the most effective initial starting thrust, making the lifting process start smoothly and with sufficient power, and avoiding the problems of jamming or requiring a large starting force that may be caused by the "dead point" position.

[0048] Based on embodiments 1-2, the working principle of this utility model is as follows: When the pull-out roller 10 needs to be raised, the piston rod of the hydraulic cylinder 1 extends and pushes the drive crank arm 3, thereby driving the transmission shaft 4 to rotate; the swing arm 7 on the transmission shaft 4 swings upward accordingly, acting as a force point to pry the pull-out roller bracket 8, causing it to rotate around the rotating shaft 9, and finally raising the pull-out roller 10 installed on it smoothly. The descent process is the reverse; the whole process is smooth and without jamming, all forces are transmitted through the shaft and arm, and the mechanical structure is stable and reliable.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A maintenance-friendly pull-out roller lifting device, comprising an external centering base (6) and a pull-out roller support (8), characterized in that: It also includes a rotary transmission mechanism and a lifting drive unit (1); The external centering base (6) is fixedly installed on the foundation; The pull-out roller bracket (8) is rotatably connected to the external centering base (6) via a rotating shaft (9); The rotary transmission mechanism includes a transmission shaft (4), a swing arm (7) and at least one bearing seat (5); the transmission shaft (4) is fixedly installed on the upper plane of the external centering base (6) through the bearing seat (5); one end of the swing arm (7) is fixedly sleeved on the transmission shaft (4), and the other end is hinged to the bottom of the pull-out roller bracket (8); The cylinder of the lifting drive unit (1) is mounted on the outside of the external centering base (6) via a hydraulic cylinder fixing base (2); the piston rod end of the lifting drive unit (1) is hinged to a drive crank arm (3), and the drive crank arm (3) is fixedly sleeved on the end of the transmission shaft (4).

2. The easy-to-maintain pull-out roller lifting device according to claim 1, characterized in that: The lifting drive unit (1) is a hydraulic cylinder.

3. The easy-to-maintain pull-out roller lifting device according to claim 1, characterized in that: The cylinder fixing base (2) and the external centering base (6) are separate structures and are fixed by bolts.

4. The easy-to-maintain pull-out roller lifting device according to claim 1, characterized in that: There are two bearing seats (5), which are respectively installed at both ends of the transmission shaft (4).

5. The easy-to-maintain pull-out roller lifting device according to claim 4, characterized in that: The bearing housing (5) is a mounted spherical ball bearing.

6. The easy-to-maintain pull-out roller lifting device according to claim 1, characterized in that: One end of the transmission shaft (4) is also provided with a connection structure of one of the following: sprocket, gear or coupling, for connecting an external drive device.

7. The easy-to-maintain pull-out roller lifting device according to claim 1, characterized in that: The hinge point of the swing arm (7) and the pull-out roller bracket (8), the center of the rotating shaft (9), and the installation center line of the pull-out roller (10) on the pull-out roller bracket (8) together constitute a lever system.

8. The easy-to-maintain pull-out roller lifting device according to claim 1, characterized in that: The installation angles of the drive crank arm (3) and the swing arm (7) on the transmission shaft (4) differ by 90° to 180°.

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