Dynamic detection method and detection device for off-line maintenance of rotary joint of continuous casting roller

Abstract

The invention discloses a dynamic detection method and device for off-line maintenance of a continuous casting roller rotary joint, and the device comprises a fixed pedestal, the outer wall of the top of the fixed pedestal is fixedly provided with equidistantly distributed bearing pedestals through bolts, a roller body is rotatably installed between the adjacent bearing pedestals, and the roller bodies at the two ends are rotatably connected with rotary joints. The rotary joint is fixed with sealing connecting flanges through bolts, one end of one sealing connecting flange is welded with a first guide pipe, the end part of the first guide pipe is fixed with a first flow meter through bolts, and one end of the other sealing connecting flange is welded with a second guide pipe; according to the method, the maintenance cost is reduced, regular detection can help to process problems when the problems are not serious, small problems are prevented from developing into large faults, and therefore the maintenance cost and complexity are reduced, abnormal conditions of the rotary joint are found and solved in time, abrasion and fatigue of parts can be relieved, and the service life of the continuous casting roller and the service life of the rotary joint are prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical manufacturing, in particular to a dynamic detection method and detection device for off-line maintenance of a continuous casting roller rotary joint. BACKGROUND

[0002] The cooling water in the continuous casting roller protects the bearing and the roller surface from high temperature, protects the continuous casting roller assembly and ensures the quality of the slab. Off-line maintenance, installation and debugging are all detected under static conditions. However, in actual production operation, the continuous casting roller is operated under conditions of high temperature, humidity, rotation and load. Sealing failure, poor lubrication, part damage or wear and other phenomena may occur during the operation.

[0003] In addition, the continuous casting roller rotary joint may fail due to the following reasons during online use: the hollow shaft of the rotary joint and the rotating body do not have the same concentricity, the assembly precision is low, foreign matter easily enters the contact surface of the friction pair, the external pressure, temperature and rotation speed exceed the selected range during use, the lubricating oil is not added according to the specified time, the sealing friction pair is deformed, the compensation ring has large wear, the sealing ring is deformed, aged and broken, and the corrugated pipe is broken. Therefore, off-line dynamic detection of the continuous casting roller rotary joint after off-line maintenance is very important, and is the key to directly affect the service life of the continuous casting roller rotary joint. SUMMARY

[0004] The present application relates to the technical field of mechanical manufacturing, in particular to a dynamic detection method and detection device for off-line maintenance of a continuous casting roller rotary joint.

[0005] To achieve the above purpose, the present application adopts the following technical scheme:

[0006] A dynamic detection device for off-line maintenance of a continuous casting roller rotary joint, comprising a fixed pedestal, a plurality of bearing seats are fixed on the top outer wall of the fixed pedestal by bolts, a roller body is rotatably installed between adjacent bearing seats, a rotary joint is rotatably connected to both ends of the roller body, a sealing connection flange is fixed to the rotary joint by bolts, a first conduit is welded to one end of one of the sealing connection flanges, a first flow meter is fixed to the end of the first conduit by bolts, a second conduit is welded to one end of the other sealing connection flange, and a second flow meter is fixed to the outer wall of the second conduit by bolts, a water inlet pipe is connected to one side of the first flow meter, a circulating pump is connected to the end of the water inlet pipe away from the first flow meter, and a return pipe is fixed between the circulating pump and the second flow meter by bolts.

[0007] The outer wall of one side of the bottom of the roller body is rotationally provided with a driven carrier roller, and the outer wall of the other side of the bottom of the roller body is rotationally provided with a driving carrier roller, one end of the outer wall of the driving carrier roller is fixed with a first synchronous pulley through a screw, and the outer wall of the first synchronous pulley is engaged with a synchronous belt, one end of the synchronous belt is engaged with a second synchronous pulley, and the outer wall of one side of the second synchronous pulley is connected with a speed reducer motor through a shaft coupling at the shaft center, the bottom of the rotary joint is provided with a visible camera, and the outer wall of one side of the rotary joint is provided with an infrared thermal imager, the top of one side of the fixed pedestal is provided with a PLC controller, and the PLC controller is connected with a first flowmeter, a second flowmeter, a speed reducer motor, a visible camera and an infrared thermal imager through signal lines.

[0008] As a further scheme of the application: the middle part of the first conduit is inserted and fixed with a first pressure sensor, and the middle part of the second conduit is inserted and fixed with a second pressure sensor, and the inner walls of the first conduit and the second conduit are both installed with temperature sensors.

[0009] As a further scheme of the application: the inner wall of one side of the water inlet pipe is communicated with a pressure gauge through a pipeline, and the pressure gauge is installed with a pressure pump on one side.

[0010] As a further scheme of the application: the inner wall of one side of the middle part of the return pipe is communicated with a sampling pipe, and the end of the sampling pipe is fixed with an electric control valve.

[0011] As a further scheme of the application: the top of the fixed pedestal is welded with a support frame on one side of the driven carrier roller, and the top of the support frame is slidingly inserted with a mounting seat, the bottom of one side of the mounting seat is connected with an electric telescopic rod through a screw, and the two mounting seats are rotationally installed with pressure rollers.

[0012] As a further scheme of the application: the two pressure rollers are located above the roller body, and the distance between the two pressure rollers is less than the diameter of the inner wall of the roller body.

[0013] As a further scheme of the application: the outer wall of the top of the fixed pedestal is installed with a fixed frame through a bolt, and the top of the fixed frame is provided with a hydraulic jack, the bottom of the hydraulic jack is connected with a counterweight pressing block through a piston rod, and the counterweight pressing block is located directly above the roller body.

[0014] As a further scheme of the application: the top of the fixed frame is penetrated to form a limiting hole at both ends, and the top of the counterweight pressing block is welded with a limiting guide column at both ends, the limiting guide column is located directly below the limiting hole, and the limiting hole and the limiting guide column form an inserted fit.

[0015] A dynamic detection method for off-line maintenance of a continuous casting roller rotary joint, comprising the following steps:

[0016] S1: First, with the help of bearing seat adjacent to the roll body rotation installed in the bearing seat, and the bearing seat is fixed in the fixed pedestal top, after assembly splicing rotary joint installed in the two ends of the roll body to connect the process, to ensure that it can rotate stably, and connected with the test system;

[0017] S2: After the simulation of the actual working fluid transmission conditions, the production of different steel circulating water pressure and flow is different, generally between 0.5~1.2MPa, select the appropriate size of circulating pump, its power is 11KW, lift is 80 meters, flow is 12.5m 3 / h, voltage is 380v, so as to provide the power of water circulation, ensure the water in the system flow, meet the actual water pressure and flow requirements;

[0018] S3: Next, the remaining parts are assembled, and according to the actual production of different steel grade, the speed of the on-line continuous casting roll is also different, select three asynchronous motor 1400r / min / 4 stage motor power is 5.5kW, the speed of the continuous casting roll is usually 60r / min output speed, the speed ratio is about 1400÷60≈23.33, and the cycloidal pinwheel reducer XWD5-23-5.5 type is selected and matched with it;

[0019] S4: Simulate different working temperature conditions, mainly control the circulating water temperature and the temperature for controlling the test environment, and use the temperature sensor set in the inner wall of the first and second pipes for temperature feedback, and adjust the water flow according to the output signal of the PLC controller, so as to control the water temperature;

[0020] S5: In order to detect the sealing condition of the roll body under dynamic condition, first start the speed reducer to drive the driving roller to rotate, so as to cooperate with the three direction driven rollers and the pressure roller of the roll body, which can drive the roll body to rotate, so as to cooperate with the visual camera to detect whether the leakage phenomenon appears at the connection of the rotary joint, and the infrared thermal imager on the side monitors the temperature of the rotary joint in operation. Abnormal high temperature may indicate that the friction increases or the lubrication is poor;

[0021] S6: In addition, in order to further simulate the pressure of the slab on the continuous casting roll and the gravity of the slab itself, while the roll body is rotating, the hydraulic jack at the top drives the counterweight block to descend, and applies 10~30 tons of pressure to the roll body, so as to simulate the external force of the continuous casting roll of different steel grades and different positions;

[0022] S7: Wherein the first pressure sensor and the second pressure sensor installed in the middle of the first conduit and the second conduit can monitor the pressure change in real time during the working process, if the pressure appears abnormal fluctuation or exceeds the set range, it indicates that the rotary joint has problems such as leakage or blockage, and for the rotary joint using circulating water medium online, the sample can be extracted periodically for analysis to detect impurities, wear particles, water content and the like in the circulating water medium, so as to evaluate the wear condition inside the rotary joint.

[0023] Compared with the prior art, the application provides a dynamic detection method and detection device for off-line maintenance of a continuous casting roller rotary joint, which has the following beneficial effects:

[0024] 1. The line detection device of the design plays a key role in the continuous casting process, if the rotary joint fails, it may cause production interruption, causing huge economic losses, through the dynamic detection device, potential problems can be found in time, maintenance and repair can be carried out in advance, the continuous production is ensured, and the production continuity is ensured.

[0025] 2. The detection device of the design, the failure of the rotary joint may affect the cooling effect of the continuous casting roller, thereby causing the quality of the casting blank to decrease, such as cracks, segregation and other defects, real-time detection can ensure the normal operation of the rotary joint, which helps to stabilize the quality of the casting blank and improve the product quality.

[0026] 3. The detection device of the design, if the failure of the rotary joint is not found in time, it may cause more serious equipment damage, and even cause safety accidents, while the dynamic detection device can give an early warning, take measures to avoid dangerous situations, prevent safety accidents, and through real-time monitoring and data analysis of the running state of the rotary joint, the performance change trend can be understood, which provides a basis for optimizing equipment design and operation parameters, and improves the efficiency and reliability of the whole continuous casting system.

[0027] 4. The detection device of the design reduces maintenance cost, regular detection can help to deal with problems when they are not serious, avoid small problems developing into big faults, thereby reducing the cost and complexity of repair, and timely discovery and solution of abnormal conditions of the rotary joint can reduce the wear and fatigue of parts and prolong the service life of the continuous casting roller and the rotary joint.

[0028] The parts not involved in the device are the same as or can be realized by the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0029] Fig. 1 The whole three-dimensional structure schematic diagram of the dynamic detection device for off-line maintenance of the continuous casting roller rotary joint is provided.

[0030] Fig. 2The whole three-dimensional structure front view of a dynamic detection device for off-line maintenance of a continuous casting roller rotary joint is provided in the application;

[0031] Fig. 3 The whole three-dimensional structure side view of a dynamic detection device for off-line maintenance of a continuous casting roller rotary joint is provided in the application;

[0032] Fig. 4 The first perspective structure schematic view of a dynamic detection device for off-line maintenance of a continuous casting roller rotary joint is provided in the application;

[0033] Fig. 5 The partial structure enlarged schematic view of a dynamic detection device for off-line maintenance of a continuous casting roller rotary joint is provided in the application;

[0034] Fig. 6 The partial structure side view of a dynamic detection device for off-line maintenance of a continuous casting roller rotary joint is provided in the application.

[0035] In the figure: 1, fixed pedestal; 2, bearing seat; 3, roller body; 4, rotary joint; 5, sealing connection flange; 6, first conduit; 7, first flowmeter; 8, second conduit; 9, second flowmeter; 10, water inlet pipe; 11, circulating pump; 12, return pipe; 13, first pressure sensor; 14, second pressure sensor; 15, pressure gauge; 16, pressurizing pump; 17, sampling pipe; 18, electric control valve; 19, driven idler; 20, driving idler; 21, first synchronous pulley; 22, synchronous belt; 23, second synchronous pulley; 24, speed reduction motor; 25, support frame; 26, mounting seat; 27, electric telescopic rod; 28, compression roller; 29, visual camera; 30, infrared thermal imager; 31, fixed frame; 32, hydraulic jack; 33, counterweight pressing block; 34, limiting hole; 35, limiting guide column. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application.

[0037] Embodiment 1:

[0038] A dynamic detection device for off-line maintenance of a continuous casting roller rotary joint is provided in the application. In this embodiment, the device comprises a fixed pedestal, a bearing seat, a roller body, a rotary joint, a sealing connection flange, a first conduit, a first flowmeter, a second conduit, a second flowmeter, a water inlet pipe, a circulating pump, a return pipe, a first pressure sensor, a second pressure sensor, a pressure gauge, a pressurizing pump, a sampling pipe, an electric control valve, a driven idler, a driving idler, a first synchronous pulley, a synchronous belt, a second synchronous pulley, a speed reduction motor, a support frame, a mounting seat, an electric telescopic rod, a compression roller, a visual camera, an infrared thermal imager, a fixed frame, a hydraulic jack, a counterweight pressing block, a limiting hole and a limiting guide column. Figs. 1-6As shown, including fixed pedestal 1, the top outer wall of the fixed pedestal 1 is fixed with equidistant distribution of bearing seat 2 by bolt, and adjacent bearing seat 2 is rotatably mounted with roller body 3, both ends of the roller body 3 are rotatably connected with rotary joint 4, and the rotary joint 4 is fixed with sealing connection flange 5 by bolt, one end of one of the sealing connection flange 5 is welded with first conduit 6, and the end of the first conduit 6 is fixed with first flowmeter 7 by bolt, one end of the other sealing connection flange 5 is welded with second conduit 8, and the outer wall of the second conduit 8 is fixed with second flowmeter 9 by bolt;

[0039] Reduce maintenance cost, regular detection can help to deal with the problem is not serious, avoid small problems develop into big fault, thereby reducing the cost and complexity of repair, and timely discovery and solve the abnormal situation of rotary joint 4, can reduce the wear and fatigue of parts, prolong the service life of continuous casting roller and rotary joint 4;

[0040] The side of the first flowmeter 7 is connected with water inlet pipe 10, and the end of the water inlet pipe 10 away from the first flowmeter 7 is connected with circulating pump 11, and the circulating pump 11 and the second flowmeter 9 are fixed with return pipe 12 by bolt;

[0041] The middle part of the first conduit 6 is inserted and fixed with first pressure sensor 13, and the middle part of the second conduit 8 is inserted and fixed with second pressure sensor 14, and the inner wall of the first conduit 6 and the second conduit 8 is mounted with temperature sensor;

[0042] If the failure of the rotary joint 4 is not found in time, it may cause more serious equipment damage, and even cause safety accident, and the dynamic detection device can give early warning, take measures to avoid dangerous situation, prevent safety accident, and through real-time monitoring and data analysis of the running state of the rotary joint 4, the performance change trend can be understood, which provides basis for optimizing equipment design and operation parameter, improves the efficiency and reliability of the whole continuous casting system;

[0043] The inner wall of one side of the water inlet pipe 10 is communicated with pressure gauge 15 through pipeline, and the pressure gauge 15 is installed with pressure pump 16 on one side, the inner wall of one side of the middle part of the return pipe 12 is communicated with sampling pipe 17, and the end of the sampling pipe 17 is fixed with electric control valve 18;

[0044] The outer wall of one side of the bottom of the roller body 3 is rotatably provided with driven idler 19, and the outer wall of the other side of the bottom of the roller body 3 is rotatably provided with driving idler 20, the outer wall of one end of the driving idler 20 is fixed with first synchronous pulley 21 through screw, and the outer wall of the first synchronous pulley 21 is engaged with synchronous belt 22, one end of the synchronous belt 22 is engaged with second synchronous pulley 23, and the outer wall of one side of the second synchronous pulley 23 is connected with speed reducing motor 24 through shaft coupling at the shaft center;

[0045] The top outer wall of the fixed pedestal 1 is provided with a fixed frame 31 through bolt installation, and the top of the fixed frame 31 is provided with a hydraulic jack 32, the bottom piston rod of the hydraulic jack 32 is connected with a counterweight block 33, and the counterweight block 33 is located directly above the roller body 3;

[0046] The failure of the rotary joint 4 can affect the cooling effect of the continuous casting roller, thereby causing the quality of the casting blank to decrease, such as cracks, segregation and other defects, real-time detection can ensure the normal operation of the rotary joint 4, which helps to stabilize the quality of the casting blank and improve the product quality;

[0047] The top of the fixed frame 31 is provided with a limiting hole 34 at both ends, and the top of the counterweight block 33 is welded with a limiting guide column 35 at both ends, the limiting guide column 35 is located directly below the limiting hole 34, and the limiting hole 34 and the limiting guide column 35 form a plug-in cooperation;

[0048] Example 2:

[0049] A kind of dynamic detection device for off-line maintenance of continuous casting roller rotary joint, as shown in Figs. 1-4 The top of the fixed pedestal 1 is welded with a support frame 25 on one side of the driven roller 19 based on example 1, and the top of the support frame 25 is slidably inserted with a mounting seat 26, the bottom of the mounting seat 26 is connected with an electric telescopic rod 27 on one side through screw, and a compression roller 28 is rotatably installed between the two mounting seats 26;

[0050] The continuous casting roller plays a key role in the continuous casting process, if the rotary joint 4 fails, it may cause production interruption, causing huge economic losses, through the dynamic detection device, potential problems can be found in time, maintenance and repair in advance, to ensure the continuous production, and ensure the production continuity;

[0051] The two compression rollers 28 are located above the roller body 3, and the spacing between the two compression rollers 28 is less than the inner wall diameter of the roller body 3;

[0052] The bottom side of the rotary joint 4 is provided with a visible camera 29, and the side outer wall of the rotary joint 4 is provided with an infrared thermal imager 30, the top side of the fixed pedestal 1 is provided with a PLC controller, and the PLC controller is connected with the first flowmeter 7, the second flowmeter 9, the speed reducer 24, the visible camera 29 and the infrared thermal imager 30 through signal lines;

[0053] A dynamic detection method for off-line maintenance of continuous casting roller rotary joint, comprising the following steps:

[0054] S1: First, with the help of bearing seat 2 adjacent roll body 3 is installed on the bearing seat 2, and the bearing seat 2 is fixed on the top of the fixed pedestal 1, after assembly and splicing, the rotary joint 4 is installed at both ends of the roll body 3 to connect and process, to ensure that it can rotate stably, and is connected with the test system;

[0055] S2: After that, the fluid transmission conditions in the actual work are simulated, and the circulating water pressure and flow of different steel grades are different, generally between 0.5-1.2MPa, the appropriate size of circulating pump 11 is selected, the power is 11KW, the lift is 80 meters, the flow is 12.5m 3 / h, the voltage is 380v, so as to provide the power of water circulation, ensure the continuous flow of water in the system, and meet the actual water pressure and flow requirements on site;

[0056] S3: Next, the remaining parts are assembled, and the speed of the on-line continuous casting roller is different according to the actual production of different steel grades, three asynchronous motors 1400r / min / 4-stage motor power 5.5kW are selected, the output speed of the continuous casting roller is usually 60r / min, the reduction ratio is about 1400÷60≈23.33, and the cycloidal pin wheel reduction motor 24XWD5-23-5.5 model is selected and matched with it;

[0057] S4: Different working temperature conditions are simulated, mainly controlling the circulating water temperature and the temperature for controlling the test environment, and using the temperature sensor arranged on the inner wall of the first conduit 6 and the second conduit 8 for temperature feedback, and adjusting the water flow according to the output signal of the PLC controller, so as to control the water temperature;

[0058] S5: In order to detect the sealing condition of the roll body 3 under dynamic condition, first start the reduction motor 24 to drive the driving roller 20 to rotate, so as to cooperate with the three other directions of the driven roller 19 and the pressure roller 28, and drive the roll body 3 to rotate, so as to cooperate with the visual camera 29 to detect at any time, whether the leakage phenomenon appears at the connection of the rotary joint 4, and the side infrared thermal imager 30 monitors the temperature of the rotary joint in operation, and the abnormally high temperature may indicate that the friction increases or the lubrication is poor;

[0059] S6: In addition, in order to further simulate the pressure of the plate blank on the continuous casting roller and the gravity of the plate blank itself, while the roll body 3 is rotating, the hydraulic jack 32 at the top drives the counterweight pressure block 33 to descend, and applies a pressure of 10-30 tons to the roll body 3, so as to simulate the external force applied to the continuous casting roller at different positions of different steel grades;

[0060] S7: Wherein the first pressure sensor 13 and the second pressure sensor 14 installed in the middle of the first conduit 6 and the second conduit 8 can monitor the pressure change in real time during the working process, if the pressure appears abnormal fluctuation or exceeds the set range, it indicates that the rotary joint 4 has problems such as leakage or blockage, and for the rotary joint 4 using circulating water medium online, samples can be extracted periodically for analysis to detect impurities, wear particles, water content and the like in the circulating water medium, so as to evaluate the wear condition inside the rotary joint.

[0061] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacements or changes according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A dynamic detection device for off-line maintenance of a continuous casting roller rotary joint, comprising a fixed pedestal (1), characterized in that, The outer wall of the top of the fixed pedestal (1) is fixed with equidistantly distributed bearing seats (2) through bolts, and adjacent bearing seats (2) are rotatably provided with roller bodies (3), both ends of the roller body (3) are rotatably connected with rotary joints (4), and the rotary joints (4) are fixed with sealing connection flanges (5) through bolts, one end of one of the sealing connection flanges (5) is welded with a first conduit (6), and the end of the first conduit (6) is fixed with a first flowmeter (7) through bolts, one end of the other sealing connection flange (5) is welded with a second conduit (8), and the outer wall of the second conduit (8) is fixed with a second flowmeter (9) through bolts, one side of the first flowmeter (7) is connected with a water inlet pipe (10), and one end of the water inlet pipe (10) away from the first flowmeter (7) is connected with a circulating pump (11), and the circulating pump (11) and the second flowmeter (9) are connected through the bolt fixed with the return pipe (12); The outer wall of the bottom of the roller body (3) is rotatably provided with a driven idler (19), and the outer wall of the other side of the bottom of the roller body (3) is rotatably provided with a driving idler (20), the outer wall of one end of the driving idler (20) is fixed with a first synchronous pulley (21) through a screw, and the outer wall of the first synchronous pulley (21) is engaged with a synchronous belt (22), one end of the synchronous belt (22) is engaged with a second synchronous pulley (23), and the outer wall of one side of the second synchronous pulley (23) is connected with a speed reducing motor (24) through a shaft coupling, the bottom of the rotary joint (4) is provided with a visible camera (29), and the outer wall of one side of the rotary joint (4) is provided with an infrared thermal imager (30), the top of the fixed pedestal (1) is provided with a PLC controller, and the PLC controller is connected with the first flowmeter (7), the second flowmeter (9), the speed reducing motor (24), the visible camera (29) and the infrared thermal imager (30) through signal lines.

2. The dynamic detection device for off-line maintenance of a continuous casting roller rotary joint according to claim 1, characterized in that, The middle of the first conduit (6) is inserted and fixed with a first pressure sensor (13), and the middle of the second conduit (8) is inserted and fixed with a second pressure sensor (14), and the inner walls of the first conduit (6) and the second conduit (8) are provided with temperature sensors.

3. The dynamic detection device for off-line maintenance of a continuous casting roller rotary joint according to claim 1, characterized in that, The inner wall of one side of the water inlet pipe (10) is communicated with a pressure gauge (15) through a pipeline, and the pressure gauge (15) is provided with a pressure pump (16) on one side.

4. The dynamic detection device for off-line maintenance of a continuous casting roller rotary joint according to claim 1, characterized in that, The inner wall of one side of the middle of the return pipe (12) is communicated with a sampling pipe (17), and the end of the sampling pipe (17) is fixed with an electric control valve (18).

5. The dynamic detection device for off-line maintenance of a continuous casting roller rotary joint according to claim 1, characterized in that, The top of the fixed pedestal (1) is welded with a support frame (25) on one side of the driven idler (19), and the top of the support frame (25) is slidably inserted with a mounting seat (26), and the bottom of the mounting seat (26) is connected with an electric telescopic rod (27) through a screw, and two mounting seats (26) are rotatably provided with pressure rollers (28).

6. The dynamic detection device for off-line maintenance of a continuous casting roller rotary joint according to claim 5, characterized in that, The two pressure rollers (28) are located above the roller body (3), and the distance between the two pressure rollers (28) is less than the diameter of the inner wall of the roller body (3).

7. The dynamic detection device for off-line maintenance of a continuous casting roll rotary joint according to claim 6, characterized in that, The top outer wall of the fixed pedestal (1) is provided with a fixed frame (31) through bolt mounting, and a hydraulic jack (32) is arranged at the top of the fixed frame (31), the bottom piston rod of the hydraulic jack (32) is connected with a counterweight pressing block (33), and the counterweight pressing block (33) is located directly above the roller body (3).

8. The dynamic detection device for off-line maintenance of a continuous casting roller rotary joint according to claim 7, characterized in that, The top of the fixed frame (31) is provided with a limiting hole (34) penetrating through both ends, and the top of the counterweight pressing block (33) is welded with a limiting guide column (35), the limiting guide column (35) is located directly below the limiting hole (34), and the limiting hole (34) and the limiting guide column (35) are formed in plug-in cooperation.

9. A dynamic detection method for off-line maintenance of a continuous casting roller rotary joint, using the dynamic detection device for off-line maintenance of a continuous casting roller rotary joint according to claim 1, characterized in that, It comprises the following steps: S1: first, the adjacent roller body (3) is rotatably mounted on the bearing seat (2) by means of the bearing seat (2), and the bearing seat (2) is fixed on the top of the fixed pedestal (1), after assembly and splicing, the rotary joint (4) is installed at both ends of the roller body (3) for connection processing, to ensure that it can rotate stably and is connected with the test system; S2: After the simulation of the actual work in the fluid transmission conditions, production of different steel circulating water pressure and flow is different, generally between 0.5~1.2MPa, select the appropriate size of circulating pump (11), its power is 11KW, head is 80 meters, flow is 12.5m 3 / h, voltage is 380v, so as to be able to provide the power of water circulation, ensure that the water in the system constantly flow, meet the actual water pressure and flow requirements; S3: the next step is to assemble the remaining parts, and according to the different actual production steel grades, the speed of the on-line continuous casting roller is also different, a three-phase asynchronous motor 1400r / min / 4-stage motor power is selected as 5.5kW, the output speed of the continuous casting roller is usually 60r / min, the reduction ratio is about 1400÷60≈23.33, and a cycloidal pin wheel reduction motor (24) XWD5-23-5.5 model is selected and matched with it; S4: simulate different working temperature conditions, mainly control the circulating water temperature and the temperature for controlling the test environment, and use the temperature sensor arranged on the inner wall of the first conduit (6) and the second conduit (8) for temperature feedback, and adjust the water flow according to the output signal of the PLC controller, so as to control the water temperature; S5: in order to detect the sealing condition of the roller body (3) under dynamic condition, first start the reduction motor (24) to drive the driving roller (20) to rotate, so as to cooperate with the other three direction driven rollers (19) and the pressure roller (28) of the roller body (3), which can drive the roller body (3) to rotate, so as to cooperate with the visual camera (29) to detect at the moment, whether the leakage phenomenon appears at the connection of the rotary joint (4), and the side infrared thermal imager (30) monitors the temperature of the rotary joint in operation, and the abnormally high temperature may indicate that the friction increases or the lubrication is poor; S6: in addition, in order to further simulate the pressure of the continuous casting roller and the gravity of the slab in actual production, while the roller body (3) is rotating, the counterweight pressing block (33) is lowered by the hydraulic jack (32) at the top, so as to apply a pressure of 10-30 tons to the roller body (3), thereby simulating the external force applied to the continuous casting roller at different positions and different steel grades. S7: Wherein the first pressure sensor (13) and the second pressure sensor (14) installed in the middle of the first conduit (6) and the second conduit (8) can monitor the pressure change in real time during the working process. If the pressure appears abnormal fluctuation or exceeds the set range, it indicates that the rotary joint (4) has problems such as leakage or blockage. For the rotary joint (4) using circulating water medium online, samples can be extracted periodically for analysis to detect impurities, wear particles, water content and other impurities in the circulating water medium to evaluate the wear condition inside the rotary joint.

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