A medium plate working roll balance cylinder impact compensation device

Abstract

The utility model discloses a kind of plate working roll balancing cylinder impact compensation devices, comprising: rolling mill balancing cylinder, rolling mill working roll, working roll bearing seat and rolling mill portal;The working roll bearing seat is installed at the both ends of the rolling mill working roll;The rolling mill portal is fixed on the both sides of working roll;The rolling mill balancing cylinder includes balancing cylinder body, piston rod, cylinder cover, concave pad and compensation block;The balancing cylinder body is installed on the rolling mill portal;The piston rod and cylinder cover are installed on the balancing cylinder body;The concave pad and compensation block are installed in the piston rod interior.The device solves the problem that working roll horizontal movement causes impact on balancing cylinder piston rod during rolling process, leading to sealing damage and hydraulic oil leakage.

Description

Technical Field

[0001] This utility model belongs to the technical field of production equipment for medium and heavy plate plants, and specifically relates to an impact compensation device for a balance cylinder of a medium and heavy plate work roll. Background Technology

[0002] In the production process of medium and heavy plates, the rolling mill is a crucial piece of equipment. A slab needs to be repeatedly rolled and stretched by the working rolls inside the rolling mill to become a plate. The working rolls are adjusted in each pass through the pressing and balancing system, which is achieved by the rolling mill's balancing cylinder. By adjusting the balancing system, the impact phenomenon caused by the gaps between parts during the rolling process can be eliminated, the bite conditions can be improved, the processing accuracy of medium and heavy steel plates can be increased, and thus the stability and processing quality of the rolling mill can be improved.

[0003] However, the working environment of the work roll balance cylinder is relatively harsh during use. This is mainly because the rolling mill frequently and repeatedly rolls, continuously bites and throws, constantly adjusts the amount of work roll reduction, and there is a gap between the work roll and the working surface of the balance cylinder. These factors cause the work roll balance cylinder to be in an extremely unstable working condition for a long time, which in turn leads to frequent leaks and other malfunctions.

[0004] The main cause of the failure is that during the biting and throwing processes in the rolling process, the working roll and its bearing seat move horizontally under the action of rolling force. This causes the piston rod of the balance cylinder to move horizontally, and the guide sleeve and seal of the piston and cylinder head are impacted, resulting in deformation and damage. In addition, oil leakage occurs during the opening adjustment process, causing the equipment to stop and generating scrap steel, which affects the yield. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides an impact compensation device for the work roll balance cylinder. The device aims to reduce the horizontal driving force of the piston rod on the work roll bearing housing during the rolling process by partially modifying the piston rod of the balance cylinder. This innovative design significantly improves the stress conditions on the piston rod, alleviates the impact on the piston, reduces oil leakage from the balance cylinder, and thus increases the operating rate and yield.

[0006] This utility model is implemented as follows: an impact compensation device for a medium-thick plate work roll balancing cylinder includes a rolling mill stand, a rolling mill work roll rotatably disposed in the rolling mill stand, work roll bearing seats respectively disposed at both ends of the rolling mill work roll, and a rolling mill balancing cylinder installed on the rolling mill stand. The rolling mill balancing cylinder includes a cylinder body, a piston rod, and a cylinder cover. The end of the piston rod is provided with a receiving cavity. A concave pad and a compensation block are disposed from bottom to top in the receiving cavity. The concave pad has a spherical concave surface, and the compensation block has a spherical lower surface that matches the spherical concave surface, so that the compensation block can swing at multiple angles relative to the concave pad. The upper surface of the compensation block is configured as a plane for contacting the work roll bearing seat.

[0007] More preferably, the concave spherical surface of the concave pad and the spherical lower surface of the compensation block are both surface hardened, with a surface hardness of HRC 55-60 and a hardened layer depth of not less than 2 mm.

[0008] More preferably, the spherical concave surface of the concave pad and the spherical lower surface of the compensation block have a contour matching degree of more than 80%.

[0009] More preferably, an annular gap is formed between the sidewall of the accommodating cavity and the compensation block.

[0010] More preferably, the width of the annular gap is 2.5 mm.

[0011] More preferably, a sealing groove is provided on the periphery of the compensation block, and a sealing ring is provided in the sealing groove.

[0012] More preferably, the device further includes a pressure plate, which is fixed to the end of the piston rod by fasteners, and encapsulates the compensation block and the concave pad in the receiving cavity.

[0013] The advantages and technical effects of this utility model are as follows: Through a series of innovative structural designs, this utility model constitutes a highly efficient and reliable impact compensation system. Its overall technical effects are significant, mainly reflected in: 1) Fundamentally solving the oil leakage problem: By actively compensating for lateral impact through the spherical substructure, the core sealing components are protected, fundamentally eliminating the main source of failure in the balance cylinder; 2) Improving equipment stability and lifespan: Significantly reducing the impact load and abnormal wear of various components of the balance cylinder, improving the overall stability of the rolling mill and the service life of key components; 3) Enhancing production economy: Reducing losses caused by equipment downtime for maintenance and product scrap, directly improving the operating rate and yield, resulting in significant economic benefits. This utility model has a clever structure, low modification cost, and is easy to install and maintain, providing an efficient solution to the pain points of the medium and heavy plate rolling industry. Attached Figure Description

[0014] Figure 1 This is the general assembly drawing of the rolling mill work roll balancing system; Figure 2 This is an assembly diagram of the work roller balance cylinder buffer device.

[0015] In the diagram: 1-1, Rolling mill archway; 1-2, Work roll bearing housing; 1-3, Rolling mill work roll; 1-4, Work roll balance cylinder; 2-1, Balance cylinder cover; 2-2, Balance cylinder cover inner seal; 2-3, Balance cylinder cover outer seal; 2-4, Piston rod; 2-5, Sealing ring; 2-6, Compensating block; 2-7, Concave pad; 2-8, Pressure plate. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0017] Please refer to Figure 1 and Figure 2 An impact compensation device for a medium-thick plate work roll balancing cylinder includes a mill stand 1-1, a mill work roll 1-3 rotatably disposed in the mill stand 1-1, work roll bearing seats 1-2 respectively disposed at both ends of the mill work roll 1-3, and a mill balancing cylinder 1-4 mounted on the mill stand 1-1. The mill balancing cylinder 1-4 includes a cylinder body, a piston rod 2-4, and a cylinder cover 2-1. The piston rod 2-4 has a receiving cavity at its end, and a concave pad 2-7 and a compensation block 2-6 are disposed from bottom to top within the receiving cavity. The concave pad 2-7 has a spherical concave surface, and the compensation block 2-6 has a spherical lower surface that mates with the spherical concave surface, allowing the compensation block 2-6 to swing relative to the concave pad 2-7 at multiple angles. The upper surface of the compensation block 2-6 is configured as a plane for contacting the work roll bearing seat 1-2.

[0018] The core innovation of this technical solution lies in introducing a "spherical concave-spherical" mating structure (concave pad and compensating block) at the piston rod end. This transforms the rigid horizontal impact of the working roller bearing seat on the piston rod into the adaptive oscillation of the compensating block on the concave pad. This design allows the upper surface of the compensating block to maintain contact with the bearing seat plane while its lower part can absorb and compensate for horizontal displacement through oscillation, thereby significantly isolating the transmission of lateral impact force to the piston rod, cylinder head, and internal seals. This fundamentally solves the problems of seal compression, deformation, and oil leakage caused by the lateral movement of the piston rod, significantly improving the working stability and service life of the balance cylinder.

[0019] Preferably, both the concave spherical surface of the concave pad 2-7 and the spherical lower surface of the compensation block 2-6 undergo surface hardening treatment, achieving a surface hardness of HRC 55-60 and a hardened layer depth of not less than 2 mm. By limiting the surface hardness and hardened layer depth of the key friction pair, the concave pad and compensation block are ensured to possess extremely high wear resistance and contact fatigue strength under long-term, high-frequency oscillation and impact loads. This effectively prevents the spherical surface from losing precision due to wear, ensuring the durability and reliability of the impact compensation function, thereby extending the service life of the entire device and reducing maintenance frequency.

[0020] Preferably, the contour matching degree between the spherical concave surface of the concave pad 2-7 and the spherical lower surface of the compensation block 2-6 is greater than 80%. This high-precision contour matching ensures that the contact area and stress distribution between the concave pad and the compensation block reach an optimal state. This reduces the pressure on the contact surface, decreases the wear rate, and makes the oscillation action smoother and more precise, avoiding localized plastic deformation and premature failure caused by point or line contact, thus ensuring the stability and accuracy of the impact compensation action.

[0021] Further preferably, an annular gap is formed between the sidewall of the accommodating cavity and the compensation blocks 2-6. This annular gap design provides the necessary movement space for the compensation blocks to swing, preventing rigid contact and friction between the compensation blocks and the sidewall of the piston rod accommodating cavity during swinging. This structure further concentrates the impact compensation function on the spherical pair, protecting the piston rod body while enhancing the flexibility and freedom of movement of the entire compensation mechanism.

[0022] More preferably, the width of the annular gap is 2.5 mm. This size can fully meet the movement space required for the compensation block to swing under the expected working conditions, while avoiding excessive gap that could cause the compensation block to tilt uncontrollably or cause unnecessary vibration, thus achieving the best balance between flexibility and stability.

[0023] Preferably, the compensation block 2-6 has a sealing groove on its periphery, and a sealing ring 2-5 is disposed within the sealing groove. The sealing ring on the compensation block constitutes a second line of defense for sealing in this device. Even if a small amount of hydraulic oil passes through the main seal between the piston rod and the cylinder head, it will be effectively blocked outside the receiving cavity by this sealing ring, preventing leakage to the outside. This double-sealing design greatly improves the sealing reliability of the entire balance cylinder and completely solves the oil leakage problem.

[0024] More preferably, the device further includes a pressure plate 2-8, which is fixed to the end of the piston rod 2-4 by fasteners, encapsulating the compensation block 2-6 and the concave gasket 2-7 within the accommodating cavity. The pressure plate structure provides a simple, reliable, and easy-to-disassemble fixing method. It can securely encapsulate the concave gasket and compensation block within the piston rod, preventing them from coming out during operation, while also facilitating quick opening during maintenance to inspect and replace the internal spherical gasket, compensation block, or sealing ring, greatly reducing maintenance difficulty and downtime.

[0025] Working Principle Explanation: The core working principle of this utility model lies in "dynamic braking and flexible compensation." During the rolling process, when the work roll bites into or throws out the steel plate, the work roll bearing seat 1-2 will move horizontally under the action of huge rolling force. In a traditional balance cylinder, the piston rod would be forcibly pushed, causing it to rigidly collide with the guide sleeve of the cylinder cover 2-1 and the seals 2-2 and 2-3, ultimately damaging the seals. In this device, when the bearing seat moves horizontally, its force is first transmitted to the upper surface of the compensation block 2-6, which is in plane contact with it. Since the lower part of the compensation block 2-6 is a spherical structure, located in the spherical concave groove of the concave pad 2-7, the horizontal force is decomposed, causing the compensation block 2-6 to produce a small adaptive oscillation on the concave pad 2-7, instead of directly transmitting the horizontal displacement to the piston rod 2-4. This oscillation process absorbs and compensates for the horizontal displacement of the bearing seat. At the same time, the annular gap between the compensation block 2-6 and the side wall of the accommodating cavity ensures that the oscillation is unimpeded. Throughout the process, the piston rod 2-4 itself basically maintains only vertical movement, and the lateral impact it bears is effectively isolated by the spherical pair structure, thereby protecting the piston rod, cylinder head and its sealing system from damage and eliminating oil leakage caused by seal failure at the source.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An impact compensation device for a medium-thick plate work roll balancing cylinder, comprising a mill stand (1-1), a mill work roll (1-3) rotatably disposed in the mill stand (1-1), work roll bearing seats (1-2) respectively disposed at both ends of the mill work roll (1-3), and a mill balancing cylinder (1-4) mounted on the mill stand (1-1), wherein the mill balancing cylinder (1-4) comprises a cylinder body, a piston rod (2-4), and a cylinder cover (2-1), characterized in that, The piston rod (2-4) has a receiving cavity at its end, and a concave pad (2-7) and a compensation block (2-6) are arranged from bottom to top in the receiving cavity. The concave pad (2-7) has a spherical concave surface, and the compensation block (2-6) has a spherical lower surface that matches the spherical concave surface, so that the compensation block (2-6) can swing at multiple angles relative to the concave pad (2-7). The upper surface of the compensation block (2-6) is configured as a plane for contacting the work roll bearing housing (1-2).

2. The impact compensation device for the balance cylinder of the medium-thick plate work roll according to claim 1, characterized in that, The concave spherical surface of the concave pad (2-7) and the spherical lower surface of the compensation block (2-6) are both surface hardened, with a surface hardness of HRC 55-60 and a hardened layer depth of not less than 2mm.

3. The impact compensation device for the balance cylinder of the medium-thick plate work roll according to claim 2, characterized in that, The spherical concave surface of the concave pad (2-7) and the spherical lower surface of the compensation block (2-6) have a contour matching degree of more than 80%.

4. The impact compensation device for the balance cylinder of the medium-thick plate work roll according to claim 1, characterized in that, An annular gap is formed between the sidewall of the accommodating cavity and the compensation block (2-6).

5. The impact compensation device for the balance cylinder of the medium-thick plate work roll according to claim 4, characterized in that, The width of the annular gap is 2.5 mm.

6. The impact compensation device for the balance cylinder of the medium-thick plate work roll according to claim 1, characterized in that, The compensation block (2-6) has a sealing groove on its periphery, and a sealing ring (2-5) is provided in the sealing groove.

7. The impact compensation device for the balance cylinder of the medium-thick plate work roll according to claim 1, characterized in that, The device further includes a pressure plate (2-8), which is fixed to the end of the piston rod (2-4) by fasteners, and encapsulates the compensation block (2-6) and the concave pad (2-7) in the accommodating cavity.

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