Mechanical assisted lifting device for wheel mill web roll installation

Abstract

The present application relates to the technical field of metallurgical rolling auxiliary equipment, and particularly relates to a mechanical power lifting device for mounting a web plate roller of a wheel rolling mill, which comprises a movable chassis, a rear upright column is fixed to the middle part of the rear side of the movable chassis, a support frame is arranged on the front side of the movable chassis, an obliquely arranged front extension arm is fixed to the upper side of the rear upright column and the support frame, the front end of the front extension arm is obliquely upward and forward, a fixed pulley is arranged on the front end of the front extension arm, a bidirectional hand winch with a self-locking mechanism is arranged on the upper part of the side of the front extension arm close to the rear upright column, one end of a steel wire rope wound on the bidirectional hand winch passes through the fixed pulley and is provided with a lifting hook, and a counterweight is further arranged on the rear part of the movable chassis. The device helps to solve the problems of high labor intensity, high safety risk, low efficiency and high labor input when manually replacing the web plate roller.

Description

Technical Field

[0001] This invention relates to the field of auxiliary equipment technology for metallurgical steel rolling, and specifically to a mechanically assisted lifting device for mounting spoke rolls in wheel rolling mills. Background Technology

[0002] In the wheel rolling production line, frequently changing heavy-duty spoke rollers is a high-intensity operation. Currently, it mainly relies on 2-3 workers working together to lift them by hand (first to a 0.45-meter platform, then to a 1.1-meter crowbar). This is not only extremely labor-intensive and inefficient, but also poses serious risks of lower back strain and injury from falling rollers. Although some lever-type tools exist, they generally suffer from insufficient effort-saving ratio, inaccurate forward positioning, inconvenient movement, and poor stability and safety under complex working conditions.

[0003] Utility model patent CN206767514U discloses a mobile crane. This patent discloses a small crane suitable for lifting and moving heavy objects in confined spaces, including a three-sided concave base, a column, a self-locking hand-cranked winch, an upper crossbeam, a first pulley, a second pulley, a lifting line, and a hook. The three-sided concave base includes one horizontal beam and one vertical beam, with casters at the bottom. The bottom of the column is mounted on the upper surface of the three-sided concave base, and the self-locking hand-cranked winch is installed in the middle of the column. One end of the upper crossbeam is connected to the top of the column, while the other end is suspended. The upper sides of the upper crossbeam are respectively equipped with a first pulley and a second pulley. One end of the lifting line is fixed to the self-locking hand-cranked winch, and the other end passes through the first pulley and the second pulley in sequence and connects to the hook.

[0004] However, the crane is not designed for specific industrial production line conditions and uses conventional casters, which requires a certain degree of ground flatness; although a self-locking hand winch is mentioned, no other mechanical protection is mentioned; in addition, no special counterweight structure is set up, which may easily lead to instability when lifting heavy items. Summary of the Invention

[0005] The purpose of this invention is to provide a mechanically assisted lifting device for the installation of spoke rolls in wheel rolling mills. This device helps to solve the problems of high labor intensity, high safety risks, low efficiency, and high manpower input when manually replacing spoke rolls.

[0006] The technical solution of the present invention is as follows: a mechanically assisted lifting device for installing spoke rolls in a wheel rolling mill, comprising a movable chassis, a rear column fixed to the middle of the rear side of the movable chassis, a support frame provided on the front side of the movable chassis, an obliquely arranged forward extension arm fixed on the upper side of the rear column and the support frame, the front end of the forward extension arm tilting upward and extending forward, a fixed pulley installed on the front end of the forward extension arm, a bidirectional hand-cranked winch with a self-locking mechanism installed on the upper part of the forward extension arm near the rear column, one end of the steel wire rope wound on the bidirectional hand-cranked winch passing over the fixed pulley and installed with a hook; a counterweight is also installed at the rear of the movable chassis.

[0007] Furthermore, the movable chassis includes a rectangular frame welded from solid steel rods, with a pair of directional wheels mounted on the front bottom surface of the rectangular frame and a pair of omnidirectional wheels with foot-locking structures mounted on the rear bottom surface of the rectangular frame.

[0008] Furthermore, the directional wheel is a 6-inch heavy-duty high-temperature resistant directional wheel made of heavy-duty fiberglass nylon material and with built-in double ball bearings; the omnidirectional wheel is a Φ150mm polyurethane omnidirectional wheel.

[0009] Furthermore, the upper end of the rear column is welded and fixed to the rear end of the front extension arm, and a reinforcing plate connected to the front extension arm is fixed on the rear column; push rods extending outward from both ends are also welded and fixed to the upper end of the rear column.

[0010] Furthermore, the support frame includes a front column, which is higher than the rear column. The lower end of the front column is welded to the front center of the movable chassis, and the upper end of the front column is welded to the bottom center of the forward extension arm. Diagonal rods are also welded to both sides of the front end of the movable chassis. The upper ends of the diagonal rods are located on both sides of the front column and welded to the forward extension arm.

[0011] Furthermore, an angle steel plate spanning the front column and two diagonal bars is fixed at the middle of the front side of the support frame. An upwardly inclined bracing plate is welded to the middle of the angle steel plate, and the upper end of the bracing plate is welded to the lower front side of the extension arm.

[0012] Furthermore, the front end of the extension arm is welded and fixed with an inverted U-shaped anti-disengagement groove limit bar that is fastened to the outside of the fixed pulley; the hook is equipped with an anti-disengagement spring; and the wire rope is a galvanized wire rope with a diameter of 6mm and a breaking strength of ≥2300kg.

[0013] Furthermore, the counterweight is made of scrap steel and weighs more than or equal to 130 kg; the counterweight is fixed to the rear of the movable chassis and closely attached to the rear column.

[0014] Furthermore, the bidirectional hand-cranked winch has a built-in gear reduction mechanism with a reduction ratio of 1:4, and the handle of the bidirectional hand-cranked winch is 27~29cm long, with the center of the handle 90±5cm above the ground.

[0015] Furthermore, the extendable arm is welded from I-beams, and the front end of the extendable arm is 170cm~190cm off the ground.

[0016] Compared with the prior art, the present invention has the following advantages: 1. This device integrates labor-saving lifting, precise positioning, safety self-locking, and convenient mobility, helping to solve the problems of high labor intensity, high safety risks, low efficiency, and high manpower input when manually replacing spoke rollers. It enables a single person to safely and efficiently complete the standardized lifting operation of spoke rollers, accurately replacing the most arduous "two manual lifting" steps in traditional operations (ground → 0.45m platform → 1.1m crowbar), raising the roller to an installation height of 1.6m above the ground, greatly improving work efficiency and safety, and creating conditions for subsequent installation.

[0017] 2. This device combines a hand-cranked winch (with built-in gear reduction and ratchet self-locking), a fixed pulley, and a movable chassis to create a mechanical lifting and positioning system with a high labor-saving ratio (theoretical value 22.4) and a safety self-locking mechanism. A single person can lift a 100kg heavy roller with a cranking force of only about 4.5kg, without needing to exert any force from the waist.

[0018] 3. The device adopts a chassis structure with a rear-mounted adjustable counterweight and heavy-duty swivel / directional wheels. While ensuring the flexibility of movement under no-load and load, it effectively resists the overturning moment during lifting and movement, ensuring operational safety.

[0019] 4. This device optimizes the height of the hand crank from the ground (90cm) and the position of the push handle, eliminating the need for the operator to bend over and exert force throughout the process, significantly reducing labor intensity. The hand crank can be finely adjusted in both directions for easy roller alignment; although the entire vehicle is heavy, the height of the push handle is ergonomically designed, allowing the operator to use their body weight to move the device, which carries a load of approximately 200kg, for short distances (about 2 meters).

[0020] 5. In response to the complex working conditions of uneven ground with many pits and gaps in front of the rolling mill, this device adopts a 6-inch large-diameter, wide-body (50mm), heavy-duty fiberglass nylon directional wheel with built-in double ball bearings. This allows it to move and operate stably and flexibly on uneven ground with pits and gaps in front of the rolling mill, fundamentally solving the problems of heavy starting and easy jamming of existing devices, and significantly improving passability and ease of operation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram (front view) of the structure of the present invention.

[0022] Figure 2 This is a side view of the present invention.

[0023] Figure 3 This is the right view of the present invention.

[0024] Figure 4 This is an enlarged view of the fixed pulley in this invention.

[0025] Figure 5 This is an enlarged view of the hook of the present invention.

[0026] In the diagram: 10-Movable chassis; 11-Rectangular frame; 12-Directional wheel; 13-Universal wheel; 20-Rear column; 21-Reinforcing plate; 22-Push rod; 30-Support frame; 31-Front column; 32-Diagonal brace; 33-Angle steel plate; 34-Diagonal brace plate; 40-Extend arm; 50-Fixed pulley; 51-Anti-derailment limit stop bar; 60-Two-way hand winch; 61-Wire rope; 62-Handle; 70-Hook; 71-Anti-derailment spring; 80-Counterweight block. Detailed Implementation

[0027] To make the above features and advantages of the present invention more readily understood, specific embodiments are described below in conjunction with the accompanying drawings, but the present invention is not limited thereto.

[0028] refer to Figures 1 to 5 A mechanically assisted lifting device for mounting spoke rolls in a wheel rolling mill includes a movable chassis 10. A rear column 20 is fixed to the middle of the rear side of the movable chassis 10. A support frame 30 is provided on the front side of the movable chassis 10. An obliquely arranged forward extension arm 40 is fixed on the upper side of the rear column 20 and the support frame 30. The front end of the forward extension arm 40 is inclined upward and extends forward. A fixed pulley 50 is installed on the front end of the forward extension arm 40. A bidirectional hand-cranked winch 60 with a ratchet self-locking mechanism is installed on the upper part of the forward extension arm 40 near the rear column 20. One end of the steel wire rope 61 wound on the bidirectional hand-cranked winch 60 passes around the fixed pulley 50 and is equipped with a hook 70. A counterweight 80 is also installed at the rear of the movable chassis 10. The entire device is moved by a movable chassis 10, and the spoke rollers are lifted by a two-way hand winch 60 in conjunction with the outrigger 40. The stability of the entire device is improved by a counterweight 80, which effectively resists the overturning moment during lifting and moving, ensuring operational safety.

[0029] In this embodiment, to facilitate device movement and improve the overall strength of the device, the movable chassis 10 includes a rectangular frame 11 welded from solid steel rods. Specifically, the rectangular frame is formed by welding solid steel rods (demolding rods from scrap equipment) with lengths of 650mm and Ø42mm and 1200mm and Ø42mm, respectively, using Q235B steel, thereby ensuring load-bearing capacity and durability. A pair of directional wheels 12 are installed on the front bottom surface of the rectangular frame, and a pair of universal wheels 13 with foot-locking structures are installed on the rear bottom surface of the rectangular frame.

[0030] Specifically, to improve maneuverability and ease of operation, the aforementioned directional wheel 12 is a 6-inch heavy-duty high-temperature resistant directional wheel made of heavy-duty fiberglass nylon material and with built-in double ball bearings. The wheel width is 50mm, and the single wheel load capacity is ≥350kg. It can adapt to uneven ground in front of the rolling mill and effectively solve the problem of starting jamming. The omnidirectional wheel 13 is a Φ150mm polyurethane omnidirectional wheel with a single wheel load capacity of ≥300kg.

[0031] In this embodiment, the upper end of the rear column 20 is welded and fixed to the rear end of the front extension arm 40. The rear column 20 is made of 100mm Q235B I-beam steel. A reinforcing plate 21 connected to the front extension arm 40 is fixed on the rear column 20, thereby improving the connection strength between the rear column 20 and the front extension arm 40. A push rod 22 extending outward at both ends is also welded and fixed to the upper end of the rear column, so as to push the device to move through the push rod 22.

[0032] In this embodiment, the support frame 30 includes a front column 31, which is higher than the rear column 20. The lower end of the front column 31 is welded to the front center of the movable chassis 11, and the upper end of the front column 31 is welded to the bottom center of the extension arm 40. Diagonal rods 32 are also welded to both sides of the front end of the movable chassis 11. The upper ends of the diagonal rods 32 are located on both sides of the front column 31 and welded to the extension arm 40. Thus, the diagonal rods 32, in cooperation with the front column 31, support the extension arm 40 and improve its support strength.

[0033] In this embodiment, an angle steel plate 33 is fixed at the middle of the front side of the support frame 30, spanning the front column 31 and two diagonal rods 31. An upwardly inclined bracing plate 34 is welded to the middle of the angle steel plate 33, and the upper end of the bracing plate 34 is welded to the lower front side of the extension arm 40. Thus, the extension arm 40 is further supported by the bracing plate 34.

[0034] Preferably, the extension arm 40 is welded from 100mm Q235B I-beams; the working length of the extension arm 40 is 1.4m, and the front end of the extension arm 40 is 170cm~190cm off the ground, which can accurately place the spoke roll in the middle of the crowbar inside the rolling mill, meeting special process requirements.

[0035] The aforementioned non-major load-bearing components, such as the front column 31, diagonal brace 32, angle steel plate 33, and diagonal brace plate 34, are welded using 100×100×4mm Q235B equal-sided angle steel. The key welds of this device are fully penetrated. The total length of the device is ≤2.5m, and the total width is ≤0.6m, making it suitable for the operating space in front of the rolling mill.

[0036] In this embodiment, the front end of the extendable arm 40 is welded and fixed with an inverted U-shaped anti-slip groove limiting stop bar 51 that is fastened to the outside of the fixed pulley to prevent the wire rope 61 from slipping off the fixed pulley 50; the hook 70 is equipped with an anti-slip spring 71, forming multiple safety protections and improving safety. The wire rope 61 is a galvanized wire rope with a diameter of 6mm and a breaking strength ≥2300kg to ensure safety.

[0037] In this embodiment, the counterweight 80 is made of scrap steel and weighs more than or equal to 130 kg, ensuring the stability of the vehicle during the lifting process. The counterweight 80 is fixed to the rear of the movable chassis 11 and closely attached to the rear column 20.

[0038] In this embodiment, the bidirectional hand-cranked winch 60 has a built-in gear reduction mechanism with a reduction ratio of 1:4 (the ratio of the number of teeth on the drive shaft to the number of teeth on the drum). The handle 62 of the bidirectional hand-cranked winch 60 is 28cm long, and the center of the handle 62 is 90±5cm above the ground, which conforms to the ergonomic design. The operator can use their body weight to move the device with a load of about 200kg for short distances (about 2 meters). Through gear reduction and lever effort saving (handle length / drum radius = 28cm / 5cm = 5.6), the total effort saving ratio reaches 22.4. The structure is simple and the lifting stroke is large (0→1.6m).

[0039] The aforementioned bidirectional hand-cranked winch 60 is commercially available and has a rated load of 300 kg. The structure of the bidirectional hand-cranked winch 60 can be referenced in CN217921216U, a self-locking mechanism for a hand-cranked winch, or CN212740530U, a hand-cranked winch for a safety ladder.

[0040] Working principle: By cranking the bidirectional hand-cranked winch 60, the steel wire rope 61 is wound up and down through gear reduction, realizing the vertical lifting and lowering of the spoke rollers suspended below; the self-locking mechanism inside the bidirectional hand-cranked winch 60 can lock the position of the roller at any height; by pushing the frame, the roller, which has been lifted to a height of 1.6m, can be moved horizontally to the mill shaft head installation position for subsequent installation.

[0041] Example 1: A lifting test was conducted using the largest specification spoke roller with a weight of 100 kg. No-load test: The crank handle rotation resistance is ≤5N•m, the fixed pulley 50 rotates flexibly without jamming, and the ratchet self-locking mechanism of the bidirectional hand-cranked winch 60 functions normally.

[0042] Stroke verification: The hook 70 was raised from the lowest position (0m) to the highest position (1.6m) smoothly throughout the entire process without any abnormal shaking.

[0043] Load test: When operated by a single person, the actual operating force was about 5kg, which is basically consistent with the theoretical calculation value (4.5kg); after the rollers were raised to a height of 1.6m, the ratchet self-locking mechanism of the bidirectional hand-cranked winch 60 was firm and there was no slippage.

[0044] Mobile test: Under load (device weight + counterweight + rollers ≈ 230kg), the operator can easily push the device forward about 2 meters by using the center of gravity of the body, and accurately position the rollers to the crowbar installation position.

[0045] Ground adaptability test: On the ground in front of the rolling mill with slight potholes and gaps, the device passed smoothly and the front wheels did not get stuck.

[0046] Test results show that the device fully meets the design requirements and achieves the goal of enabling a single person to safely and effortlessly complete the spoke roller lifting operation.

[0047] Comparative Example 1: Using the traditional manual lifting method, two workers work together to lift a 100kg spoked roller of the same specification from the ground to a crowbar (1.1m high). This requires two lifting actions (each worker exerting force twice), taking approximately 3-5 minutes. During this process, the workers experience extreme strain on their lower backs, posing a significant risk of strain injury and the possibility of the roller falling off due to coordination errors. Compared to this technology, it exhibits significant disadvantages in terms of labor intensity, safety, and efficiency.

[0048] Example 2: A lifting test was conducted using a small-sized spoke roller weighing 40 kg.

[0049] This device can be operated by a single person. The crank handle requires an operating force of about 2 kg. To raise it to a height of 1.6 m, it only requires about 15 crank rotations, and the entire process takes about 30 seconds. The operator reported that it was "very easy and requires almost no effort."

[0050] Comparative Example 2: Using traditional manual methods to lift a 40kg small roller, two workers work together. Although this is slightly less strenuous than lifting a 100kg roller, it still requires bending over twice to exert force, putting strain on the waist. Some shifts use single-person lifting for convenience, which poses a risk of sprains. In contrast, this technology requires no bending over to exert force regardless of the roller's size, making it much less strenuous to operate.

[0051] Example 3: A movement test was conducted on a section of the rolling mill with obvious potholes and gaps. The 6-inch large-diameter wide-body fixed pulley 12 (50mm wide, with built-in double bearings) equipped with this device smoothly passed through the pothole area without jamming or violent shaking; the locking function of the caster wheel 13 effectively prevented the device from sliding during fixed-point operation.

[0052] In summary, this device has a reasonable structure, is labor-saving to operate, safe and reliable, and highly adaptable to the environment. It has successfully achieved the goal of a single person completing the lifting operation of the spoke rollers, and has significant practical value and prospects for promotion.

[0053] The above description is only a preferred embodiment of the present invention. For those skilled in the art, designing different forms of mechanically assisted lifting devices for the installation of wheel rolling mill spokes based on the teachings of the present invention does not require creative labor. All equivalent changes, modifications, substitutions and variations made in accordance with the scope of the patent application of the present invention without departing from the principles and spirit of the present invention shall be covered by the present invention.

Claims

1. A mechanically assisted lifting device for mounting spoke rolls in a wheel rolling mill, comprising a movable chassis, characterized in that, A rear column is fixed to the middle of the rear side of the movable chassis, and a support frame is provided on the front side of the movable chassis. An obliquely arranged forward extension arm is fixed on the upper side of the rear column and the support frame. The front end of the forward extension arm is inclined upward and extends forward. A fixed pulley is installed at the front end of the forward extension arm. A two-way hand-cranked winch with a self-locking mechanism is installed on the upper part of the forward extension arm near the rear column. One end of the steel wire rope wound on the two-way hand-cranked winch passes around the fixed pulley and is equipped with a hook. A counterweight is also installed at the rear of the movable chassis.

2. The mechanically assisted lifting device for mounting spoke rolls in a wheel rolling mill according to claim 1, characterized in that, The movable chassis includes a rectangular frame welded from solid steel rods, with a pair of directional wheels mounted on the front bottom surface of the rectangular frame and a pair of omnidirectional wheels with foot-locking structures mounted on the rear bottom surface of the rectangular frame.

3. A mechanically assisted lifting device for mounting spoke rolls in a wheel rolling mill according to claim 2, characterized in that, The directional wheel is a 6-inch heavy-duty high-temperature resistant directional wheel made of heavy-duty fiberglass nylon material and with built-in double ball bearings; the universal wheel is a Φ150mm polyurethane universal wheel.

4. The mechanically assisted lifting device for mounting spoke rolls in a wheel rolling mill according to claim 1, characterized in that, The upper end of the rear column is welded and fixed to the rear end of the front extension arm, and a reinforcing plate connected to the front extension arm is fixed on the rear column; push rods extending outward from both ends are also welded and fixed to the upper end of the rear column.

5. A mechanically assisted lifting device for mounting spoke rolls in a wheel rolling mill according to claim 1, 2, 3 or 4, characterized in that, The support frame includes a front column, which is higher than the rear column. The lower end of the front column is welded to the middle of the front side of the movable chassis, and the upper end of the front column is welded to the bottom of the middle of the forward extension arm. Diagonal rods are also welded to both sides of the front end of the movable chassis. The upper ends of the diagonal rods are located on both sides of the front column and welded to the forward extension arm.

6. A mechanically assisted lifting device for mounting spoke rolls in a wheel rolling mill according to claim 5, characterized in that, An angle steel plate spanning the front column and two diagonal bars is fixed at the middle of the front side of the support frame. An upward-sloping brace is welded to the middle of the angle steel plate, and the upper end of the brace is welded to the lower front side of the extension arm.

7. A mechanically assisted lifting device for mounting spoke rolls in a wheel rolling mill according to claim 1, characterized in that, The front end of the extension arm is welded and fixed with an inverted U-shaped anti-detachment groove limit bar that is fastened to the outside of the fixed pulley; the hook is equipped with an anti-detachment spring; the wire rope is a galvanized wire rope with a diameter of 6mm and a breaking strength of ≥2300kg.

8. A mechanically assisted lifting device for mounting spoke rolls in a wheel rolling mill according to claim 1, characterized in that, The counterweight is made of scrap steel and weighs more than or equal to 130 kg; the counterweight is fixed to the rear of the movable chassis and close to the rear column.

9. A mechanically assisted lifting device for mounting spoke rolls in a wheel rolling mill according to claim 1, characterized in that, The bidirectional hand-cranked winch has a built-in gear reduction mechanism with a reduction ratio of 1:

4. The handle of the bidirectional hand-cranked winch is 27~29cm long and the center of the handle is 90±5cm above the ground.

10. A mechanically assisted lifting device for mounting spoke rolls in a wheel rolling mill according to claim 1, characterized in that, The reach arm is welded from I-beams, and the front end of the reach arm is 170cm to 190cm off the ground.

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