Hydraulic vibration protection device of slab continuous casting machine

Abstract

The utility model relates to a hydraulic vibration protection device of a slab continuous casting machine. The hydraulic vibration protection device comprises a protection box, a temperature sensor and a compressed air assembly. The protection box is arranged on the outer side of the vibration hydraulic cylinder, and the upper portion of a cylinder body of the vibration hydraulic cylinder penetrates out of the top of the protection box. A strip-shaped through hole is formed in the bottom of the protection box; the temperature sensor is arranged in the protection box and located on one side of the lower portion of the vibration hydraulic cylinder. The compressed air assembly is arranged on one side of the bottom of the protection box, and the output end of the compressed air assembly penetrates through the bottom of the protection box to communicate with the interior of the protection box. According to the utility model, heat convection and heat radiation of high-temperature steam to the servo valve and the vibration position sensor can be effectively avoided, the working temperature of the servo valve group and the vibration position sensor is kept within the range of 30-40 DEG C, the problems of signal deviation, distortion and the like caused by unstable working of electrical elements due to high temperature are avoided, and the service life of the servo valve group and the vibration position sensor is prolonged. Accelerated aging of spare parts due to high temperature and influence on service life are avoided.

Description

Technical Field

[0001] This utility model relates to the field of continuous casting technology, and in particular to a hydraulic vibration protection device for a slab continuous casting machine. Background Technology

[0002] During the production process, the vibration of the casting machine crystallizer widely adopts a 4-link or 4-eccentric mechanical structure driven by a DC motor or an AC speed-regulating motor, and the vibration waveform is a sine wave.

[0003] As the requirements for the surface quality of cast billets increase, the disadvantages of sine waves become increasingly apparent: its negative slip time is relatively long, resulting in deeper vibration marks on the cast billet, which affects the surface quality of the cast billet. At the same time, it causes greater wear on the mechanical structure and a larger amount of equipment maintenance.

[0004] To improve billet quality and achieve optimal crystallizer vibration performance, a short lower vibration time and high speed are required, while a long upper vibration time and low speed are necessary. Symmetrical sinusoidal vibration can no longer meet this requirement.

[0005] In recent years, non-sinusoidal vibration systems for continuous casting molds have been developed. These systems can reduce negative slip time and provide a sufficiently large negative slip amount; they also reduce velocity changes at vibration transition points, thereby effectively reducing oscillation mark depth and improving billet surface quality. Currently, the most widely used non-sinusoidal vibration system is the hydraulic vibration system. Because hydraulic vibration systems have no mechanical wear, they extend the service life of the vibration device and reduce maintenance workload. The hydraulic vibration device for continuous casting includes two independent vibration units, each equipped with a hydraulic cylinder, each controlled by a servo valve. Sensors located inside the hydraulic cylinders can detect and control the precise position of the mold via a PLC, such as... Figure 1 As shown.

[0006] During the casting process, the action of the vibrating hydraulic cylinder applies power to the vibration device of the crystallizer at a specific frequency, amplitude, and waveform. The appropriate vibration waveform can be selected according to different product requirements, and its frequency and amplitude can be automatically adjusted according to the casting speed. Figure 2 As shown.

[0007] To ensure precise control, the hydraulic servo valve and vibration position feedback sensor in the slab continuous casting machine's hydraulic vibration system are designed on the vibration frame's hydraulic cylinder. Since the hydraulic cylinder is close to the casting slab, during casting, the zero-stage cooling water sprayed onto the high-temperature slab generates high-temperature steam. This steam, at a high temperature, causes thermal convection and radiation near the hydraulic cylinder. This high-temperature steam also causes thermal convection and radiation to the hydraulic vibration servo valve and vibration position feedback sensor. Because the core components of the servo valve and sensor are capacitors and resistors, they become unstable under high temperatures (above 70 degrees Celsius), leading to feedback signal distortion and deviation, resulting in control signal errors. Simultaneously, the high-temperature environment affects the servo valve and vibration position feedback sensor components. High temperatures accelerate all failure mechanisms, significantly increasing the failure rate of electrical components. The lifespan of electronic equipment shortens drastically with increasing temperature, making it more prone to intermittent failures, parameter deviations, and catastrophic failures (such as short circuits and open circuits). Repeated temperature changes can easily cause parameter drift, leading to excessive operating accuracy of on-site equipment and consequently affecting product quality. Utility Model Content

[0008] To address the aforementioned problems, the purpose of this utility model is to provide a hydraulic vibration protection device for slab continuous casting machines. This device can effectively solve the problem of unstable operation of electronic components caused by high temperatures at locations such as crystallizer sensors and servo valves during slab casting, such as abnormal sensor feedback signals and abnormal servo valve actions, thereby preventing unplanned shutdown accidents of the continuous casting machine.

[0009] The technical solution adopted in this utility model is as follows:

[0010] The present invention discloses a hydraulic vibration protection device for a slab continuous casting machine, comprising a protective box, a temperature sensor, and a compressed air assembly; the protective box is located outside the vibrating hydraulic cylinder, and the upper part of the cylinder body of the vibrating hydraulic cylinder extends through the top of the protective box; a strip-shaped through hole is opened at the bottom of the protective box; the temperature sensor is located inside the protective box and below the vibrating hydraulic cylinder; the compressed air assembly is located on one side of the bottom of the protective box, and its output end passes through the bottom of the protective box and communicates with the inside of the protective box.

[0011] Furthermore, the compressed air assembly includes an air duct, a control valve, and a nozzle; one end of the air duct is inserted into the interior of the protective box from the bottom, and the other end is connected to the air compression equipment; a nozzle is provided at the end of the air duct inside the protective box; and a control valve is installed on the side of the air duct outside the protective box.

[0012] Furthermore, the control valve is a ball valve.

[0013] Furthermore, the protective box is a cuboid structure welded from stainless steel plates, with a large circular through hole on its top surface corresponding to the upper part of the vibrating hydraulic cylinder body, and strip-shaped through holes and small circular through holes corresponding to the air compressor ducts on its bottom.

[0014] Furthermore, a pressure gauge is installed at the input end of the compressed air duct.

[0015] Furthermore, an inspection door is provided on one side of the protective box; the inspection door is hinged to the side wall of the protective box.

[0016] Furthermore, a sealing ring is provided between the upper part of the cylinder body of the vibration hydraulic cylinder and the protective box.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. A closed protective device is made around the vibratory hydraulic cylinder using stainless steel plates. Compressed air is connected to form a positive pressure inside the protective device to prevent high-temperature steam from causing heat convection and heat radiation to the servo valve and vibration position sensor. This ensures that the working temperature of the servo valve and vibration position sensor is kept within the range of 30-40℃, preventing electrical components from becoming unstable due to high temperature, which could lead to signal deviation and distortion. It also prevents spare parts from aging prematurely due to high temperature, thus affecting their service life.

[0019] 2. It can reduce the workload of maintenance personnel, effectively improve equipment stability, avoid equipment accidents, and extend the maintenance cycle.

[0020] 3. It can improve production continuity, avoid unplanned downtime, reduce potential malfunctions, and reduce the labor intensity of workers in the field. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the working principle of an existing vibratory hydraulic cylinder;

[0022] Figure 2 This is a simplified diagram of the hydraulic vibration of the crystallizer;

[0023] Figure 3 This is a schematic diagram of the structure of this utility model.

[0024] The attached figures are labeled as follows: 1-protective box; 2-temperature sensor; 3-strip through hole; 4-air compressor duct; 5-control valve; 6-nozzle I; 7-vibration position feedback sensor; 8-nozzle II; 9-vibration hydraulic cylinder; 10-inspection door; 11-servo valve group; 12-sealing ring; 13-pressure gauge. Detailed Implementation

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] It should be noted that in the description of this utility model, the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not mean that the device or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0027] like Figure 3 As shown, the hydraulic vibration protection device for a slab continuous casting machine proposed in this utility model includes a protective box 1, a temperature sensor 2, and a compressed air assembly.

[0028] The protective box 1 is a rectangular structure welded from stainless steel plates. Its top surface has a large circular through-hole corresponding to the upper part of the vibrating hydraulic cylinder body, and its bottom surface has a strip-shaped through-hole 3 and a small circular through-hole corresponding to the compressed air duct 4. An inspection door 10 is provided on one side of the protective box 1; the inspection door 10 is hinged to the side wall of the protective box 1.

[0029] The protective box 1 covers the outside of the vibrating hydraulic cylinder 9, and the upper part of the cylinder body of the vibrating hydraulic cylinder 9 extends upward through a large circular through hole at the top of the protective box 1; a sealing ring 12 is provided between the upper part of the cylinder body of the vibrating hydraulic cylinder 9 and the large circular through hole; the strip-shaped through hole 3 is used for cable routing; the temperature sensor 2 is located inside the protective box 1 and on the lower side of the vibrating hydraulic cylinder 9; the compressed air assembly is located on the bottom side of the protective box 1, and its output end passes through the bottom of the protective box 1 and extends into the interior of the protective box 1.

[0030] Specifically, the compressed air assembly includes an air duct 4, a control valve 5, and a nozzle 16. One end of the air duct 4 is inserted into the interior of the protective housing 1 through a small circular through-hole at the bottom of the protective housing 1, and the other end is connected to an air compression device. A nozzle is installed at the end of the air duct 4 inside the protective housing 1. A control valve 5 is installed on the side of the air duct 4 outside the protective housing 1; in this embodiment, the control valve 5 is a ball valve. In this embodiment, a pressure gauge 13 is installed at the input end of the air duct 4.

[0031] The compressed air duct 4 is equipped with a nozzle II8 on one side inside the protective box 1, which corresponds to the vibration position feedback sensor 7 of the vibration hydraulic cylinder 9.

[0032] During casting machine production, compressed air is introduced into this device from the bottom, ensuring that the servo valves, position sensors, and other components within the device operate in a stable environment of 30 degrees Celsius. The high-temperature steam generated after the casting machine begins production is isolated by this device, preventing the servo valves, position sensors, and other components from being affected by high temperatures. This invention creates a small protective space outside the vibrating hydraulic cylinder 9, while nozzles and pipelines are installed inside the protective housing 1, connected to external compressed air pipelines. Compressed air with a pressure greater than 0.3 MPa and a temperature less than 30°C is supplied, creating a 0.3 MPa positive pressure inside the protective housing 1. This prevents heat convection and radiation from the high-temperature steam affecting the servo valve assembly 11 and the vibration position feedback sensor 7, ensuring that the temperature of the servo valve assembly 11 and the vibration position feedback sensor 7 is around 30°C. This avoids instability in the operation of electrical components due to high temperatures, thereby preventing signal deviations, distortions, and continuous casting machine shutdowns.

[0033] Matters not covered in this utility model are common knowledge.

[0034] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A hydraulic vibration protection device for a slab continuous casting machine, characterized in that: The device includes a protective box, a temperature sensor, and a compressed air assembly. The protective box is located outside the vibrating hydraulic cylinder, and the upper part of the cylinder body of the vibrating hydraulic cylinder extends through the top of the protective box. A strip-shaped through hole is opened at the bottom of the protective box. The temperature sensor is located inside the protective box and below the vibrating hydraulic cylinder. The compressed air assembly is located on one side of the bottom of the protective box, and its output end passes through the bottom of the protective box and communicates with the inside of the protective box.

2. The hydraulic vibration protection device for a slab continuous casting machine according to claim 1, characterized in that: The compressed air assembly includes an air duct, a control valve, and a nozzle; one end of the air duct is inserted into the protective box from the bottom, and the other end is connected to the air compression equipment; a nozzle is provided at the end of the air duct inside the protective box; and a control valve is installed on the side of the air duct outside the protective box.

3. The hydraulic vibration protection device for a slab continuous casting machine according to claim 2, characterized in that: The control valve is a ball valve.

4. The hydraulic vibration protection device for a slab continuous casting machine according to claim 2, characterized in that: The protective box is a rectangular structure welded from stainless steel plates. Its top surface has a large circular through hole corresponding to the upper part of the vibrating hydraulic cylinder, and its bottom surface has a small circular through hole corresponding to the air compressor duct.

5. A hydraulic vibration protection device for a slab continuous casting machine according to claim 2, characterized in that: A pressure gauge is installed at the input end of the compressed air duct.

6. The hydraulic vibration protection device for a slab continuous casting machine according to claim 1, characterized in that: An inspection door is provided on one side of the protective box; the inspection door is hinged to the side wall of the protective box.

7. The hydraulic vibration protection device for a slab continuous casting machine according to claim 1, characterized in that: A sealing ring is provided between the upper part of the cylinder body of the vibration hydraulic cylinder and the protective box.

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