Continuous rolling host safety shaft and shaft fracture treatment method

Abstract

The invention relates to a continuous rolling host safety shaft and a shaft fracture treatment method. The safety shaft is composed of a shaft body main body part, a motor output end connecting flange plate and a speed reducer input end connecting flange plate. A shearing ring groove is formed in the outer ring surface of the main body part of the shaft body; standby flange plates are welded to the two sides of the shearing ring groove respectively, a plurality of pin shaft mounting holes are formed in the two standby flange plates in the circumferential direction in a one-to-one correspondence mode, and a gap is reserved between the inner end faces of the two standby flange plates; the method comprises the following steps: 1, after a pipe rolling production line is shut down, cleaning burrs generated at the fracture part of the shearing ring groove; 2, a main motor is started, when the transmitting end and the receiving end of the correlation type sensor are aligned in the axial direction, the main motor stops running, and pin shaft mounting holes in the two standby flange plates are aligned one by one; and 3, pin shafts for equipment penetrate into the multiple groups of aligned pin shaft mounting holes, and the pin shafts are locked by lock nuts, so that the reconnection of the two sections of broken safety shafts is realized. The maintenance time is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of iron and steel metallurgy, and relates to a continuous rolling main machine safety shaft and a shaft fracture treatment method. Background Art

[0002] In a pipe rolling production line, the continuous rolling main machine safety shaft is located between the continuous rolling main motor and the speed reducer, and is composed of a shaft body part and large flange parts welded to both ends of the shaft body part. A plurality of bolt mounting holes (more than 14) are evenly distributed along the circumferential direction on the large flange parts at both ends. One end of the large flange is coaxially and fixedly connected to the output end of the main motor through bolts inserted into a plurality of bolt mounting holes on it, and the other end of the large flange is coaxially and fixedly connected to the input end of the speed reducer through bolts inserted into a plurality of bolt through holes on it. To avoid torque overload, a shear ring groove is provided at a certain position of the shaft body part as a weak part for the continuous rolling main machine safety shaft to fracture under overload. The main functions of the continuous rolling main machine safety shaft are: Function 1, to transmit the motor torque; Function 2, when an abnormal situation suddenly occurs during the rolling process of the continuous rolling main machine and the torque exceeds the set value, the shear ring groove of the safety shaft fractures, and the speed reducer and the motor are disengaged, avoiding damage to the internal gears or transmission shafts of the speed reducer due to excessive torque, and playing a role in protecting the speed reducer.

[0003] Currently, during the process of pipe rolling production, the continuous rolling main machine safety shaft has fractured many times. After each fracture, a new safety shaft is replaced. Each replacement requires the production line to stop for about 2 hours. During the 2-hour shutdown process, 28 bolts at both ends need to be removed, the fractured shafts at both ends are lifted away by a crane, and then a new continuous rolling main machine safety shaft is lifted by a crane to the installation position between the main motor and the speed reducer. After aligning the bolt holes on the large flange plates at both ends of the new continuous rolling main machine safety shaft with the bolt holes on the main motor and the speed reducer respectively, 28 bolts are inserted and tightened. The whole process takes a long time and has a large labor intensity, seriously affecting the operation efficiency of the production line and increasing the production cost.

[0004] In order to shorten the shutdown time caused by replacing the safety shaft, the structure of the safety shaft is redesigned and reformed. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a continuous rolling main machine safety shaft and a shaft fracture treatment method that can effectively shorten the shutdown maintenance time, extend the service life of the continuous rolling main machine safety shaft, reduce the production cost, and improve the production efficiency of the pipe rolling production line.

[0006] One of the above-mentioned objects of the present invention is achieved through the following technical solutions:

[0007] A continuous rolling main machine safety shaft, characterized in that: the continuous rolling main machine safety shaft is composed of a shaft body main part and motor output end connection flange plates and reducer input end connection flange plates welded to both ends of the shaft body main part. A plurality of bolt mounting holes are evenly distributed along the circumferential direction on both the motor output end connection flange plate and the reducer input end connection flange plate; a shear ring groove is arranged on the outer ring surface of the shaft body main part; on the outer ring surface of the shaft body main part on both sides of the shear ring groove, a spare flange plate is welded respectively. The outer diameters of the two spare flange plates are smaller than the outer diameters of the flange plates at both ends of the continuous rolling main machine safety shaft. A plurality of pin mounting holes are evenly arranged along the circumferential direction on the two spare flange plates. The pin mounting holes on the two spare flange plates correspond one by one, and a gap is left between the inner end faces of the two spare flange plates.

[0008] Moreover, the outer diameters of the two spare flange plates are equal, and a relief ring groove is arranged at the middle position of the inner end of the two spare flange plates close to the shear ring groove.

[0009] Moreover, sensor mounting seats are welded oppositely on the outer ring surfaces of the spare flange plates on both sides. The emitting end of an opposed type sensor is axially mounted on the sensor mounting seat of one side spare flange plate along the continuous rolling main machine safety shaft, and the receiving end of the opposed type sensor is axially mounted on the sensor mounting seat of the other side spare flange plate along the continuous rolling main machine safety shaft. On the shaft body main part, a set of conductive slip rings are respectively mounted on the outer sides of the two spare flange plates. The inner rings of the two sets of conductive slip rings are fixedly connected with the shaft body main part and are respectively connected with the leads of the emitting end of the opposed type sensor and the leads of the receiving end of the opposed type sensor; the outer rings of the two sets of conductive slip rings are connected with the control system of the pipe rolling production line through wires to realize the output of detection signals; when the emitting end of the opposed type sensor is aligned with the receiving end of the opposed type sensor, the pin mounting holes on the two spare flange plates are in an aligned state one by one, so as to accurately detect the relative positions of the two spare flange plates through the opposed type sensor.

[0010] The second above-mentioned object of the present invention is achieved through the following technical solution:

[0011] A continuous rolling main machine safety shaft and a shaft fracture treatment method, characterized by including the following steps:

[0012] Step 1: After the pipe rolling production line stops, first clean the burrs generated at the fracture of the shear ring groove;

[0013] Step 2: Start the main motor. The main motor drives the connected section of the continuous rolling main machine safety shaft to rotate. When the emitting end of the opposed type sensor is axially aligned with the receiving end of the opposed type sensor, the control system of the pipe rolling production line controls the main motor to stop running. At this time, the pin mounting holes on the two spare flange plates are in an aligned position one by one;

[0014] Step 3: Insert spare pins one by one into multiple groups of aligned pin installation holes. The spare pin consists of a pin main body part, a large-diameter shaft head part provided at one end of the pin main body part, and an external thread shaft part provided at the other end of the pin main body part. Lock the external thread shaft part of the pin with a locknut. Through the cooperation of two spare flanges and the spare pin, the re-fixation connection of the safety shaft of the two-section broken continuous rolling main machine is realized.

[0015] Moreover, the material of the spare pin is 45# steel, a forging blank, with a hardness of HB219 - 25 after heat treatment and a surface finish of Ra1.6.

[0016] The advantages and positive effects of the present invention are as follows:

[0017] Based on the existing structure of the safety shaft of the continuous rolling main machine, on both sides of the shear ring groove on the main body part of the shaft, spare flanges are relatively arranged, and corresponding pin installation holes are provided on the spare flanges. Cooperating with high-strength spare pins, the safety shaft of the continuous rolling main machine can be reconnected and used after fracture. On the one hand, it can avoid removing the fractured safety shaft of the continuous rolling main machine, greatly reducing the maintenance time of the safety shaft and being beneficial to improving the production efficiency of the pipe rolling production line. On the other hand, it can effectively extend the service life of the safety shaft of the continuous rolling main machine and reduce production costs. Description of the Drawings

[0018] Figure 1 is the structural diagram of the safety shaft of the continuous rolling main machine of the present invention before fracture;

[0019] Figure 2 is the schematic diagram of the safety shaft of the continuous rolling main machine of the present invention after fracture connected by a spare pin. Detailed Embodiments

[0020] The structure of the present invention will be further described below with reference to the drawings and through embodiments. It should be noted that this embodiment is narrative rather than restrictive.

[0021] A safety shaft of a continuous rolling main machine, please refer to Figure 1 - Figure 2 , the safety shaft of the continuous rolling main machine is composed of a shaft main body part 2 and a motor output end connection flange 1 and a reducer input end connection flange 7 welded to both ends of the shaft main body part 2. A plurality of bolt installation holes are evenly arranged along the circumferential direction on both the motor output end connection flange 1 and the reducer input end connection flange 7. A shear ring groove 2.1 is provided on the outer ring surface of the shaft main body part 2, and the shear ring groove 2.1 is a ring groove with a triangular cross-section. The innovation points of the present invention are:

[0022] On the outer ring surface of the shaft body main part 2, on both sides of the shear ring groove 2.1, a spare flange 8 is welded respectively. The outer diameters of the two spare flanges 8 are smaller than the outer diameters of the flanges at both ends of the safety shaft of the continuous rolling main machine. Along the circumferential direction, a plurality of pin shaft mounting holes are arranged on the two spare flanges 8. The pin shaft mounting holes on the two spare flanges 8 correspond to each other one by one, and a gap is left between the inner end faces of the two spare flanges 8. The two spare flanges 8 are preferably arranged with equal outer diameters. At the middle of the inner ends of the two spare flanges 8, at the position corresponding to the shear ring groove 2.1, a relief ring groove is arranged. The arrangement of the relief ring groove plays a role in reducing weight and facilitating welding.

[0023] In addition, in order to realize the accurate and rapid alignment of the pin shaft mounting holes on the two spare flanges after the safety shaft of the continuous rolling main machine breaks at the shear ring groove 2.1, in the present invention, on the outer ring surfaces of the spare flanges on both sides, sensor mounting seats 5 are welded relatively. On the sensor mounting seat 5 of one side spare flange, the transmitting end 4 of an opposed type sensor is installed along the axial direction of the safety shaft of the continuous rolling main machine. On the sensor mounting seat 5 of the other side spare flange, the receiving end 6 of the opposed type sensor is installed along the axial direction of the safety shaft of the continuous rolling main machine. On the shaft body main part 2, on the outer sides of the two spare flanges 8, a group of slip rings 3 are installed respectively. The inner rings 3.1 of the two groups of slip rings 3 are fixedly connected with the shaft body main part 2, and are respectively connected with the leads of the transmitting end 4 of the opposed type sensor and the leads of the receiving end 6 of the opposed type sensor. The outer rings 3.2 of the two groups of slip rings 3 are connected with the control system of the pipe rolling production line through wires to realize the output of detection signals. The outer ring 3.2 of the slip ring 3 is a fixed ring and can be installed on a ring bracket, which is not shown in the drawings. When the transmitting end 4 of the opposed type sensor is aligned with the receiving end 6 of the opposed type sensor, the pin shaft mounting holes on the two spare flanges 8 are in a one-to-one alignment state, so as to realize the accurate detection of the relative positions of the two spare flanges 8 through the opposed type sensor.

[0024] In the present invention, the pin shaft mounting holes on the two spare flanges 8 are preferably six.

[0025] Matched with the above-mentioned pin shaft mounting holes, a special spare pin shaft 9 is designed. The spare pin shaft 9 is composed of a pin shaft main part, a large-diameter shaft head part arranged at one end of the pin shaft main part, and an external thread shaft part arranged at the other end of the pin shaft main part. The diameter of the pin shaft main part is consistent with the aperture of the pin shaft mounting hole on the spare flange 8. The length of the pin shaft main part is slightly smaller than the sum of the thicknesses of the two spare flanges. The spare flange 8 is reserved with six pin shaft mounting holes. According to the different installation positions of the safety shaft in the continuous rolling main machine, after a fracture fault occurs, different numbers of pin shafts can be selected for installation to resume production; the material of the pin shaft is 45# steel, a forging blank, and the hardness after heat treatment is HB219 - 25, and the surface finish Ra is 1.6.

[0026] Based on the above continuous rolling main machine safety shaft, the processing method after its fracture includes the following steps:

[0027] Step 1: After the pipe rolling production line stops, first clean the burrs generated at the fracture of the shear ring groove 2.1;

[0028] Step 2: Start the main motor, and the main motor drives the rotation of a section of the continuous rolling main machine safety shaft connected thereto. When the transmitting end 4 of the opposed type sensor is axially aligned with the receiving end 6 of the opposed type sensor, the control system of the pipe rolling production line controls the main motor to stop running. At this time, the pin installation holes on the two spare flanges 8 are in a one-to-one alignment position;

[0029] Step 3: Insert the spare pins 9 into the aligned pin installation holes one by one, and lock the external threaded shaft part of the pins with lock nuts. Through the cooperation of the two spare flanges 8 and the spare pins 9, the re-fixing connection of the two fractured continuous rolling main machine safety shafts is realized.

[0030] Through the improved setting of the continuous rolling main machine safety shaft, the present invention can realize the reuse of the continuous rolling main machine safety shaft after fracture, and the handling of the safety shaft fracture accident can be shortened from the original 2 hours to within 30 minutes, and the downtime can be shortened by about 1.5 hours each time. According to the current production situation, about 9 hours of downtime can be saved in a year. Calculated at a production rate of 140 tons per hour and a profit of 602 yuan per ton, 9 hours of downtime due to faults can be saved every year. After the transformation, the expected profit is: 140 * 602 * 9 = 758520 yuan.

[0031] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art can understand that various substitutions, changes and modifications are possible without departing from the spirit of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the content disclosed in the embodiments and drawings.

Claims

1. A continuous rolling main machine safety shaft, characterized in that: The safety shaft of the continuous rolling main machine is composed of the main body part of the shaft and the motor output end connection flange and the reducer input end connection flange welded to both ends of the main body part of the shaft. A plurality of bolt mounting holes are evenly arranged along the circumferential direction on both the motor output end connection flange and the reducer input end connection flange; a shear ring groove is arranged on the outer ring surface of the main body part of the shaft; on the outer ring surface of the main body part of the shaft on both sides of the shear ring groove, a spare flange is welded respectively. The outer diameters of the two spare flanges are smaller than the outer diameters of the flanges at both ends of the safety shaft of the continuous rolling main machine. A plurality of pin mounting holes are evenly arranged along the circumferential direction on the two spare flanges. The pin mounting holes on the two spare flanges correspond to each other one by one, and a gap is left between the inner end faces of the two spare flanges.

2. The safety shaft of the continuous rolling main machine according to claim 1, characterized in that: The outer diameters of the two spare flanges are equal, and a relief ring groove is arranged at the middle position of the inner ends of the two spare flanges near the shear ring groove.

3. The safety shaft of the continuous rolling main machine according to claim 1, characterized in that: Sensor mounting seats are welded oppositely on the outer ring surfaces of the spare flanges on both sides. The transmitting end of the opposed sensor is axially mounted on the sensor mounting seat of one of the spare flanges along the safety shaft of the continuous rolling main machine, and the receiving end of the opposed sensor is axially mounted on the sensor mounting seat of the other spare flange along the safety shaft of the continuous rolling main machine. On the main body part of the shaft, a set of conductive slip rings are respectively mounted on both sides of the two spare flanges. The inner rings of the two sets of conductive slip rings are fixedly connected to the main body part of the shaft and are respectively connected to the leads of the transmitting end of the opposed sensor and the leads of the receiving end of the opposed sensor; the outer rings of the two sets of conductive slip rings are connected to the control system of the pipe rolling production line through wires to realize the output of detection signals; when the transmitting end of the opposed sensor is aligned with the receiving end of the opposed sensor, the pin mounting holes on the two spare flanges are in a one-to-one alignment state, so as to accurately detect the relative positions of the two spare flanges through the opposed sensor.

4. A method for processing the shaft fracture of the continuous rolling main machine safety shaft according to claim 3, characterized in that, It includes the following steps: Step 1: After the pipe rolling production line stops, first clean the burrs generated at the fracture of the shear ring groove. Step 2: Start the main motor, and the main motor drives the safety shaft of the continuous rolling main machine connected thereto to rotate. When the transmitting end of the opposed sensor is axially aligned with the receiving end of the opposed sensor, the control system of the pipe rolling production line controls the main motor to stop running. At this time, the pin mounting holes on the two spare flanges are in a one-to-one alignment position. Step 3: Wear spare pins one by one into the aligned groups of pin mounting holes. The spare pin consists of a pin main body part, a large-diameter shaft head part arranged at one end of the pin main body part, and an external thread shaft part arranged at the other end of the pin main body part, and lock the external thread shaft part of the pin with a locknut. Through the cooperation of the two spare flanges and the spare pins, the re-fixation connection of the two fractured safety shafts of the continuous rolling main machine is realized.

5. The method for processing the shaft fracture of the continuous rolling main machine safety shaft according to claim 4, characterized in that: The material of the spare pin is 45# steel, a forging blank, with a hardness of HB219 - 25 after heat treatment and a surface finish of Ra1.6.

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