Hoisting device for replacing guide and guard of rough and intermediate rolling vertical rack

Abstract

The utility model relates to the field of steel rolling, in particular to a hoisting device for replacing a guide of a rough and intermediate rolling vertical rack. Comprising a main cross beam which is of a hollow structure, an upper hanging ring is arranged in the center of the top face of the main cross beam, a lower hanging ring is arranged at one end of the bottom face of the main cross beam, an auxiliary cross beam is slidably inserted into a cavity in the side, away from the lower hanging ring, of the main cross beam, and a balancing weight is arranged at the outer end of the auxiliary cross beam; and bolts are inserted into the limiting holes. Through the combined design of the main cross beam and the telescopic auxiliary cross beam, the length of the auxiliary cross beam is adjusted in a sliding mode, so that a hoisting path avoids the vertical axis of a speed reducer housing, guide and guard vertical hoisting alignment is achieved, the risk of manual pushing alignment is avoided, and a balancing weight at the tail end of the auxiliary cross beam and a lower hoisting ring form a lever balance system to adapt to guides and guards with different weights. The torque is adjusted by sliding the auxiliary cross beam to ensure the hoisting stability; and the limiting holes and the plug pins realize multi-gear fixation to adapt to guides and guards with different specifications and sizes.

Description

Technical Field

[0001] This utility model relates to the field of steel rolling, specifically a hoisting device for replacing guide rails on vertical stands of roughing and intermediate rolling mills. Background Technology

[0002] In the steel rolling industry, the vertical rolling mill, as the core equipment in the roughing and intermediate rolling processes, directly affects the rolling accuracy and product quality due to the stability and replacement efficiency of its guide device. The guide device is used to guide the workpiece accurately into the rolls, avoiding surface scratches or dimensional deviations caused by misalignment. However, the guide device is subjected to the impact of the rolled workpiece and high-temperature friction for a long time, which can easily lead to surface wear, deformation or cracking, affecting the guiding accuracy of the rolled workpiece. It needs to be replaced regularly to maintain the rolling quality. In addition, the reducer arch of the vertical rolling mill is usually located at the top of the rolling mill and is on the same vertical axis as the guide device, resulting in spatial overlap between the two. Although this design is beneficial for power transmission, it directly blocks the guide hoisting path and increases the difficulty of replacement. Traditional overhead crane hoisting requires oblique pulling to avoid the rolling mill arch, which makes it impossible for the guide to be vertically aligned and requires manual pushing to straighten. The manual pushing process has the risk of crushing injury and poor safety. Moreover, the hoisting process is prone to collision between the guide and rolling mill components due to uneven force, which aggravates equipment wear. When rolling products of different specifications (such as changes in the diameter of bars and wire rods), it is necessary to replace the guide device with a suitable one to ensure that the rolled workpiece bites into the rolls accurately and avoid rolling failures due to guide size mismatch. Utility Model Content

[0003] The present invention aims to solve the above problems, thereby providing a hoisting device for replacing guide rails on the vertical frame of roughing and intermediate rolling mills that can avoid the gearbox archway.

[0004] The technical solution adopted by this utility model to solve the aforementioned problem is:

[0005] A hoisting device for replacing guide rails on a vertical stand of a roughing and intermediate rolling mill includes a main crossbeam, which is a hollow structure. An upper lifting ring is provided at the center of the top surface of the main crossbeam, and a lower lifting ring is provided at one end of the bottom surface of the main crossbeam. A secondary crossbeam is slidably inserted into the cavity on the side of the main crossbeam away from the lower lifting ring. A counterweight is provided at the outer end of the secondary crossbeam. Several limiting holes are provided opposite to each other on the main crossbeam and the secondary crossbeam, and pins are inserted into the limiting holes.

[0006] Compared with the prior art, the outstanding features of this utility model, which adopts the above technical solution, are:

[0007] The combined design of the main crossbeam and the telescopic secondary crossbeam allows for sliding adjustment of the secondary crossbeam's length, ensuring the hoisting path avoids the vertical axis of the reducer archway and achieving vertical hoisting alignment of the guide. This avoids the risks associated with manual adjustment. The counterweight at the end of the secondary crossbeam and the lower lifting ring form a lever balance system, adaptable to guides of different weights. The torque is adjusted by sliding the secondary crossbeam, ensuring hoisting stability. Limiting holes and pins enable multi-position fixing, adapting to guide sizes of different specifications.

[0008] As a preferred embodiment, a further technical solution of this utility model is:

[0009] Furthermore, a groove is provided on the side wall of the main crossbeam, and a limit rod is provided on the secondary crossbeam. The limit rod passes through the groove and is slidably connected to it.

[0010] Furthermore, both ends of the chute are sealed. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0012] The components are marked as follows: main crossbeam 1, upper lifting ring 11, lower lifting ring 12, slide groove 13, secondary crossbeam 2, limit rod 21, counterweight block 3, limit hole 4, and pin 5. Detailed Implementation

[0013] The present invention will be further described below with reference to embodiments, the purpose of which is only to better understand the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0014] A hoisting device for replacing guide rails on a vertical stand of a roughing and intermediate rolling mill includes a main crossbeam 1, which is a hollow structure. An upper lifting ring 11 is located at the center of the top surface of the main crossbeam 1, and the upper lifting ring 11 is connected to a crane hook. A lower lifting ring 12 is located at one end of the bottom surface of the main crossbeam 1, and the lower lifting ring 12 is connected to the guide rail to be hoisted. A secondary crossbeam 2 is slidably inserted into the cavity on the side of the main crossbeam 1 away from the lower lifting ring 12. A counterweight 3 is located at the outer end of the secondary crossbeam 2. The counterweight 3 weighs... The weight is 20kg (suitable for lightweight guides). Several limiting holes 4 are arranged opposite each other on the main crossbeam 1 and the secondary crossbeam 2. Pins 5 are inserted into the limiting holes 4 in an L-shape. The hollow structure of the main crossbeam 1 reduces the overall weight and facilitates lifting operations. It is made of high-strength alloy steel to ensure the main crossbeam 1 meets strength requirements, such as 30CrMnSiA alloy steel, 42CrMo alloy steel, or 16Mn low-alloy high-strength steel. The coordination of the lifting rings and counterweights... This design achieves multi-point force balance, reduces the risk of stress concentration at a single point, and improves hoisting stability. The secondary crossbeam 2 is slidably inserted into the cavity of the main crossbeam 1, and its length can be adjusted to adapt to guides of different sizes, solving the problem of insufficient adaptability of traditional fixed crossbeams. The counterweight block 3 and the lower lifting ring 12 form a lever balance system. By adjusting the sliding position of the secondary crossbeam 2 to match the weight of the guide, the shaking caused by the center of gravity shift is eliminated, improving operational safety. According to the load range of commonly used guides (20-60kg), they are generally divided into light guides (20-30kg), medium guides (30-50kg), and heavy guides (50-60kg). The position of the secondary crossbeam 2 is adjusted in advance according to the three specifications of guides. After the counterweight block 3 and the guide are balanced, limit holes 4 are opened and marked on the main crossbeam 1 and the secondary crossbeam 2, so that when replacing guides of different specifications in the future, the marked limit holes 4 can be used directly.

[0015] Furthermore, a groove 13 is provided on the side wall of the main crossbeam 1, and a limit rod 21 is provided on the secondary crossbeam 2. The limit rod 21 passes through the groove 13 and is slidably connected to it. Only by moving the limit rod 21 can the position of the secondary crossbeam 2 be coarsely adjusted. The cooperation between the groove 13 and the limit rod 21 can limit the movement trajectory of the secondary crossbeam 2, avoid sliding deviation or tilting, and ensure more accurate adjustment of the center of gravity balance between the counterweight 3 and the guide.

[0016] Furthermore, both ends of the slide 13 are sealed off, and the sealing design prevents the limit rod 21 from slipping off the track when it slides to the end of the slide 13.

[0017] The upper lifting ring 11 connects to the overhead crane hook, and the lower lifting ring 12 connects to the guide rail to be lifted. The combination design of the main crossbeam 1 and the telescopic secondary crossbeam 2 allows the lifting path to avoid the vertical axis of the reducer stand by sliding and adjusting the length of the secondary crossbeam 2. First, the guide rail is transported longitudinally to below the height of the mill stand, and then the guide rail is moved horizontally to vertical alignment to achieve vertical lifting and alignment of the guide rail, avoiding the risk of manual pushing and straightening. The counterweight block 3 at the end of the secondary crossbeam 2 and the lower lifting ring 12 form a lever balance system to accommodate guide rails of different weights. The torque is adjusted by sliding the secondary crossbeam 2 to ensure lifting stability. The limit hole 4 and the pin 5 achieve multi-position fixing to accommodate guide rails of different sizes.

[0018] The above description is only a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.

Claims

1. A hoisting device for replacing guide rails on a vertical stand of a roughing and intermediate rolling mill, comprising a main crossbeam, characterized in that: The main crossbeam is a hollow structure. An upper lifting ring is set at the center of the top surface of the main crossbeam, and a lower lifting ring is set at one end of the bottom surface of the main crossbeam. A secondary crossbeam is slidably inserted into the cavity on the side of the main crossbeam away from the lower lifting ring. A counterweight is set at the outer end of the secondary crossbeam. Several limiting holes are set opposite to each other on the main crossbeam and the secondary crossbeam, and pins are inserted into the limiting holes.

2. The hoisting device for replacing guide rails on a vertical stand of a roughing and intermediate rolling mill according to claim 1, characterized in that: The main crossbeam has a sliding groove on its side wall, and the secondary crossbeam has a limit rod that passes through the sliding groove and is slidably connected to it.

3. The hoisting device for replacing guide rails on a vertical stand of a roughing and intermediate rolling mill according to claim 2, characterized in that: Both ends of the chute are sealed.

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