A limiting system for preventing hydraulic shear overstroke in a steelmaking continuous casting process

Abstract

The utility model discloses a kind of limiting systems for preventing hydraulic shears overtravel in steelmaking continuous casting process, comprising: limiting rod, its lower end is above the body of hydraulic shears, limiter, fixed in the upper end of limiting rod;Force bar, force bar is used to when shear arm oil cylinder is carried out shearing to steel material, with shear arm oil cylinder upward movement;Shear arm oil cylinder is used to from bottom to top and left 45 degrees movement is inclined, and then steel material is sheared;Horizontal force bar, horizontally set, its one end is fixedly connected with the upper end of force bar, its other end is close to hydraulic shears setting, and extend to hydraulic shears;Horizontal force bar is used to be driven by force bar and move upward, and contact limiter, and then make the shear arm oil cylinder of hydraulic shears start to contract, stop to extend out;The utility model is accurately, reliably limited to the ascent of hydraulic shears, effectively prevent the damage of equipment caused by overextension of oil cylinder, improve system operation safety and maintenance convenience.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic shear equipment, and in particular relates to a limit system for preventing hydraulic shears from overtravel during the steelmaking continuous casting process. Background Technology

[0002] In the continuous casting production process of the metal processing industry, hydraulic shears for continuously cast billets are commonly used equipment. Hydraulic shears are mainly driven by a hydraulic system to perform shearing operations on continuously cast billets. Their working principle is to use the extension and retraction of a hydraulic cylinder to drive the shears to rise and fall, thereby completing the cutting of the billet.

[0003] Traditional hydraulic shear limit devices typically employ a mechanical limit structure. This structure usually includes a limit block and a limit switch. The limit block is installed at a suitable position on the hydraulic shear. When the hydraulic shear rises to a certain position, it encounters the limit block, triggering the limit switch to actuate, cutting off the hydraulic system's oil circuit and preventing the hydraulic shear from rising further. The structural relationship is that the limit block corresponds to the movable part of the hydraulic shear, and the limit switch is connected to the control system. When the limit block triggers the limit switch, it transmits a signal to the control system, which then controls the hydraulic system. Existing control methods, without a dedicated limiter, primarily rely on manual observation and simple mechanical limits to control the rising height of the hydraulic shear. When approaching the upper limit position, the hydraulic system is manually stopped.

[0004] In mechanical limit devices, the limit blocks and limit switches are susceptible to wear and deformation during prolonged and frequent use, leading to inaccurate limiting and frequent malfunctions or failures. For example, in the high-temperature and high-humidity continuous casting production environment, corrosion on the surface of the limit blocks and oxidation of the limit switch contacts can affect the reliability of the limit device. Relying on manual observation to control the lifting height of the hydraulic shears introduces significant human error. Operators may be unable to accurately judge the position of the hydraulic shears due to fatigue or obstructed vision, easily causing the cylinder to overtravel. Furthermore, there is a time delay between observation and manual shutdown of the hydraulic system; within this short period, the hydraulic shears may have already exceeded their safe travel range. Utility Model Content

[0005] The purpose of this invention is to provide a limit system for preventing hydraulic shear overtravel in the continuous casting process of steelmaking, so as to solve the problem of inaccurate overtravel control caused by component aging or human delay in traditional limit methods.

[0006] This utility model adopts the following technical solution: a limit system for preventing hydraulic shears from overtravel in the continuous casting process of steelmaking, comprising: The limit rod is set vertically above the hydraulic shear, with its lower end above the body of the hydraulic shear and its upper end extending upward. The limit switch is fixed to the upper end of the limit rod; The force-bearing rod is vertically installed on the side of the hydraulic shear for continuous casting billets. Its lower end is fixedly connected to the movable end of the hydraulic shear arm cylinder. The force-bearing rod is used to move upward with the hydraulic shear arm cylinder when the hydraulic shear arm cylinder cuts the steel. The hydraulic shear arm cylinder is used to move from bottom to top and tilt to the left at a 45-degree angle to cut the steel. The horizontal support bar is horizontally positioned, with one end fixedly connected to the upper end of the force-bearing bar, and the other end positioned close to the hydraulic shear and extending toward the hydraulic shear. The horizontal support bar is used to move upward under the drive of the force-bearing bar and contact the limit switch, thereby causing the hydraulic shear arm cylinder to retract and stop extending.

[0007] The beneficial effects of this utility model are: This utility model adopts a combination of a movable welded force-bearing rod and a contact conduction relay coil, and through the grounding characteristics of the hydraulic shear itself and the special design of the limiter, it achieves precise detection and control of the lifting height of the hydraulic shear; The limit switch body of this utility model can be made of high-strength and high-density insulating material, which not only ensures electrical safety, but also improves the reliability and durability of the limit switch. This invention provides precise and reliable limitation on the upward stroke of the hydraulic shear, effectively preventing equipment damage caused by cylinder overextension, and improving system operation safety and maintenance convenience. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the horizontal load-bearing rod non-contact limiter of this utility model; Figure 2 This is a schematic diagram of the horizontal load-bearing rod contact limiter of this utility model.

[0009] Among them: 10, limiting rod; 11, limit device; 12, force-bearing rod; 13, horizontal load-bearing rod. Detailed Implementation

[0010] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0011] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "multiple" means two or more. The term "orientation" in this utility model refers to the orientation of the utility model within the... Figure 1 Description of the state's progression.

[0012] In modern steel continuous casting production, hydraulic shears, as key online shearing equipment, play a crucial role in cutting high-temperature continuously cast billets to length. They are driven by a hydraulic cylinder in the shear arm, which moves the upper shear blade up and down in conjunction with the lower shear blade to complete the shearing action. Due to the high temperature, high humidity, strong vibration, and high dust levels in the working environment, the stability of the equipment faces severe challenges. Especially during the shearing process, if the upward stroke of the shear arm cylinder exceeds the set safety range, i.e., "overtravel," it may lead to serious mechanical failures such as piston disengagement, seal failure, structural deformation, or even breakage. It may also cause interference with surrounding roller conveyors or other equipment, resulting in a chain reaction of damage. Traditional limit methods often use a mechanical collision structure where a fixed stop triggers a limit switch. This suffers from problems such as slow response, easy oxidation of contacts, wear and loosening, and frequent maintenance. Under high-frequency operation, its reliability is poor, making it difficult to meet the safety and stability requirements of current automated production lines.

[0013] Therefore, this utility model discloses a limiting system for preventing hydraulic shears from overtravel in the continuous casting process of steelmaking, such as... Figure 1 and Figure 2 As shown, it includes: a limiting rod 10, a limiting device 11, a force-bearing rod 12, and a horizontal load-bearing rod 13.

[0014] The limiting rod 10 is set vertically, located above the hydraulic shear, with its lower end above the body of the hydraulic shear and its upper end extending upward.

[0015] The limiter 11 is fixed to the upper end of the limit rod 10.

[0016] The force-bearing rod 12 is set vertically and is located on the side of the hydraulic shear for continuous casting billets. The lower end of the force-bearing rod 12 is fixedly connected to the movable end of the hydraulic shear arm cylinder. The force-bearing rod 12 is used to move upward with the hydraulic shear arm cylinder when the hydraulic shear arm cylinder cuts the steel. The hydraulic shear arm cylinder is used to move from bottom to top and tilt to the left at a 45-degree angle to cut the steel.

[0017] The horizontal support rod 13 is set horizontally. One end of the horizontal support rod 13 is fixedly connected to the upper end of the force rod 12, and the other end of the horizontal support rod 13 is set close to the hydraulic shear and extends toward the hydraulic shear. The horizontal support rod 13 is used to move upward under the drive of the force rod 12 and contact the limiter 11, thereby causing the hydraulic shear arm cylinder to start to retract and stop extending.

[0018] Preferably, the limiter 11 is a limit switch.

[0019] Preferably, the angle between the axis of the force-bearing rod 12 and the direction of the scissor arm cylinder is 135 degrees.

[0020] Preferably, the force-bearing rod 12 is fixedly connected to the movable end of the hydraulic shear arm cylinder of the hydraulic shear via a connecting plate.

[0021] Preferably, the force-bearing rod 12 is located between the two cooling water spray devices of the hydraulic shear blades.

[0022] This invention incorporates a force-bearing rod 12 welded to the movable part of a hydraulic shear, along with a contact relay coil. The force-bearing rod 12 reflects the rising and falling states and stroke of the hydraulic shear. The limit switch 11 on the hydraulic shear body is made of high-strength, high-density insulating material, with one end connected to an adjustable mechanism and reliably grounded. The output terminal A of a 36V isolation transformer is grounded, and terminal B is connected to the contactor coil a1. Contactor b1 is connected to point C on-site via a cable, and point C is connected to ground via insulating material. When the hydraulic shear rises to the required height, the force-bearing rod 12 contacts point C, activating the contactor coil, generating a magnetic field that attracts the moving contact, thus actuating the contactor.

[0023] The specific implementation of this utility model is as follows: Step 1: Install the force-bearing rod 12 on the movable part of the continuous casting billet hydraulic shear; Step 2: Make a limiter 11 on the main body structure of the continuous casting billet hydraulic shear. Specifically, it is made of high-strength and high-density insulating material. One end is connected to an adjustable mechanism and reliably connected to the ground, and the other end is connected to the a end of a 36V isolation transformer. The b end of the transformer is directly grounded.

[0024] Step 3: When the hydraulic shear of the continuous casting billet rises to the required height, the contact relay coil is activated.

[0025] The limit switch 11 of this utility model is made of high-strength, high-density insulating material, ensuring the safety and reliability of the equipment in complex industrial environments. The force-bearing rod 12 can reflect the status of the hydraulic shears in real time, facilitating user monitoring and management of the equipment. The control method using a contact-conduction relay coil achieves highly precise control of the equipment, and the entire technical solution has a simple structure, is easy to install and use, and reduces the operating costs of the equipment.

[0026] The limiting rod 10 is a rigid support component, arranged vertically above the hydraulic shear body. Its lower end is fixedly connected to a stable structural part at or near the top of the hydraulic shear body, and its upper end extends upward to form a high-level installation reference point. The limiting rod 10 is mainly used to support and position the limiter 11, ensuring its relative position in space remains constant, thus providing a stable trigger reference surface for the entire limiting action. The limiting rod 10 can be made of high-strength metal materials such as Q345 steel or stainless steel, and its cross-sectional shape can be circular, square, or polygonal. The specific dimensions are determined according to the on-site installation space and stress requirements; for example, the diameter can range from 20mm to 60mm, and the length is set with an appropriate margin based on the maximum allowable stroke of the shear arm. This structural design allows for adjustable installation height and precise positioning of the limiter 11, adapting to the needs of different models of hydraulic shears.

[0027] The limit switch 11 is fixedly installed at the top of the limit rod, serving as the system's signal output unit. It senses whether the horizontal support rod 13 has reached the preset upper limit position and issues a control command at the moment of contact to interrupt the extension of the scissor arm cylinder. The limit switch 11 can be a mechanical limit switch, proximity switch, photoelectric sensor, or other non-contact or light-contact sensing element, as long as it can achieve position detection and electrical signal conversion. Optionally, the limit switch 11 has a certain degree of impact resistance and environmental tolerance, suitable for high-temperature and dusty working conditions. Its installation can be achieved through bolt fastening, clamping, or welding bracket fixation, ensuring no displacement or loosening during operation. When the horizontal support rod 13 rises to its limit position and makes physical contact with the limit switch 11 or enters the sensing range, the limit switch 11 immediately outputs a switch signal, which is transmitted to the main control system, triggering the hydraulic solenoid valve to switch direction, causing the scissor arm cylinder to change from the extended state to the retracted state, thereby preventing further upward movement.

[0028] The lower end of the force-bearing rod 12 is connected to the movable end of the scissor arm cylinder (such as the piston rod end or hinge lug), while the upper end is connected to the horizontal support rod 13. When the scissor arm cylinder performs a shearing action and moves upward, the force-bearing rod 12 rises synchronously, driving the horizontal support rod 13 to move upward, creating conditions for triggering the stroke. This rod can be made of solid round steel, square tubing, or H-beams. It is recommended to use alloy structural steel with good wear resistance and fatigue resistance. The surface can be galvanized or sprayed to enhance corrosion resistance.

[0029] The horizontal support rod 13 extends horizontally, with one end rigidly connected to the upper end of the force-bearing rod 12, and the other end protruding towards the hydraulic shear body, forming a cantilever structure that can move upwards as a whole with the linkage mechanism. As the shear arm cylinder rises, the force-bearing rod 12 drives the horizontal support rod 13 to rise synchronously. When the preset height is reached, its free end contacts the limiter 11 fixed to the top of the limit rod, completing the limiting action. The function of this rod is to extend the trigger distance, improve the action sensitivity, and avoid the influence of high temperature radiation and splashes in the shearing area through the horizontal extension structure, thereby improving the service life of the sensor. The horizontal support rod 13 can be made of steel pipe or aluminum profile, which is lightweight and has moderate rigidity. The connection methods include welding, pin hinge, or flange bolt connection, which is convenient for disassembly and maintenance. Its extension length can be customized according to the shearing stroke of different models, generally between 200mm and 800mm. The end can be equipped with a buffer pad or roller to reduce contact impact.

[0030] The method of using this utility model is as follows: the extension and retraction movement of the scissor arm cylinder first drives the force-bearing rod 12 to move upward. This movement is further transmitted to the horizontal support rod 13 fixed to it, causing the entire rod to rise and approach the limiter 11. When the set position is reached, the horizontal support rod 13 touches the limiter 11, triggering the control system to cut off the oil supply to the cylinder and start the retraction program. The entire process requires no manual intervention and relies entirely on mechanical linkage to achieve automatic limiting, with rapid response and clear logic.

[0031] 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, improvements, etc., 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. A limiting system for preventing hydraulic shears from overtravel during continuous casting in steelmaking processes, characterized in that, include: The limiting rod (10) is set vertically above the hydraulic shear, with its lower end above the body of the hydraulic shear and its upper end extending upward. A limiter (11) is fixed to the upper end of the limit rod (10); The force-bearing rod (12) is set vertically and is located on the side of the hydraulic shear for continuous casting billets. Its lower end is fixedly connected to the movable end of the hydraulic shear arm cylinder. The force-bearing rod (12) is used to move upward with the hydraulic shear arm cylinder when the hydraulic shear arm cylinder cuts the steel. The shear arm cylinder is used to move from bottom to top and tilt to the left at a 45-degree angle to shear the steel. A horizontal support rod (13) is set horizontally, with one end fixedly connected to the upper end of the force rod (12), and the other end set close to the hydraulic shear and extending toward the hydraulic shear; the horizontal support rod (13) is used to move upward under the drive of the force rod (12) and contact the limiter (11), thereby causing the hydraulic shear arm cylinder to begin to retract and stop extending.

2. A limiting system for preventing hydraulic shear overtravel in the continuous casting process of steelmaking, as described in claim 1, characterized in that, The limit switch (11) is a limit switch.

3. A limiting system for preventing hydraulic shear overtravel in the continuous casting process of steelmaking, as described in claim 1, characterized in that, The angle between the axis of the force-bearing rod (12) and the direction of the scissor arm cylinder is 135 degrees.

4. A limiting system for preventing hydraulic shear overtravel in the continuous casting process of steelmaking according to claim 1, characterized in that, The force-bearing rod (12) is fixedly connected to the movable end of the hydraulic shear arm cylinder of the hydraulic shear through a connecting plate.

5. A limiting system for preventing hydraulic shear overtravel in the continuous casting process of steelmaking, as described in claim 1, characterized in that, The force-bearing rod (12) is located between the two cooling water spray devices of the hydraulic shear blades.

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