A stress detection device for steel plate production

Abstract

The present invention discloses a stress detection device for steel plate production, and relates to the field of stress detection technology. The present invention comprises a base, on which two slides are movably mounted, and inside each slide are fixedly arranged a plurality of long-strip toggle assemblies, the tops of the plurality of toggle assemblies are meshed with the transmission assembly, and a cylinder brush is arranged between the two groups of transmission assemblies; the transmission assembly comprises a cam, the cam is located directly above the toggle assembly, and the bottom of the cam is arranged with a plurality of ratchets, and the plurality of ratchets are meshed with the ratchet block of the bottom toggle assembly, the top of the cam is movably connected to one end of a movable arm through a pin shaft, and the other end of the movable arm is fixedly connected to a side surface of a piston through a movable part, and the piston is slidably mounted inside a movable chamber. The present invention can evenly coat the surface of the steel plate with a coupling agent by arranging a cylinder brush, and at the same time, the ultrasonic measurement method can be used to avoid damage to the steel plate caused by mechanical detection, and the accuracy of the stress detection result of the steel plate can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of stress detection, and in particular relates to a stress detection device for steel plate production. Background Art

[0002] During the production process, steel plates will be subjected to mechanical processing or heat processing, which will generate residual stress inside the steel plates. The existence of residual stress has a significant impact on the mechanical properties of the steel plates. On the one hand, it will reduce the strength of the steel plates and cause process defects such as deformation and cracking of the steel plates during the manufacturing process; on the other hand, it will reduce the fatigue strength, stress corrosion and other mechanical properties of the steel plates during the natural release process after manufacturing, thus causing problems in use; therefore, it is necessary to detect the residual stress inside the steel plates during the manufacturing process to ensure the quality of the steel plates.

[0003] For steel plate stress detection, traditional detection methods can be divided into destructive mechanical methods (small hole method, crack flexibility method, etc.) and non-destructive physical methods (ultrasonic method, X-ray method, magnetic measurement method, etc.) according to the difference in the degree of damage to the steel plate. The mechanical method is to remove the material of part of the area of ​​the steel plate to be tested, release the stress in the removed area, measure the strain of the component caused by the stress release, and calculate the magnitude of the residual stress; the physical method uses X-rays, ultrasonic waves and other signals to detect the lattice distortion and the change of the propagation speed of sound caused by the external stress, so as to calculate the residual stress value; compared with the mechanical residual stress test method, the physical method will not cause any damage to the component, and has unique advantages in the stress detection during the manufacturing and service of precision, expensive and large equipment; and in the process of stress detection of steel plates, ultrasonic physical method stress detection is obviously more applicable. When using ultrasound to detect stress on steel plates, the surface of the steel plates needs to be cleaned and a layer of coupling agent needs to be coated on the surface of the steel plates. The surface of the steel plates is scanned by ultrasonic wedges to detect the residual stress inside the steel plates. However, the cleaning of the steel plate surface and the coating of the coupling agent are currently done manually. Manual coating of the coupling agent cannot guarantee the coating thickness of the coupling agent, which affects the detection results. Because the stress detection results of the ultrasonic wedge are subject to the distance between the ultrasonic wedge and the steel plate, changes in the distance will cause errors in the detection results. Therefore, the coupling agent needs to be evenly coated on the surface of the steel plate.

[0004] The existing steel plate stress detection is to manually remove dust and impurities on the steel plate surface and manually apply coupling agent. It cannot ensure that the coupling agent is evenly coated on the steel plate surface, which affects the result of steel plate stress detection. For this reason, the present invention proposes a stress detection device for steel plate production. Summary of the invention

[0005] The purpose of the present invention is to provide a stress detection device for steel plate production, so as to solve the problem that the existing steel plate stress detection is to manually remove dust and impurities on the surface of the steel plate and manually apply the coupling agent, which cannot ensure that the coupling agent is evenly coated on the surface of the steel plate, thereby affecting the result of the steel plate stress detection.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention discloses a stress detection device for steel plate production, comprising a base, two slides are movably mounted on the base, a plurality of long-strip toggle assemblies are fixedly arranged inside each slide, the tops of the plurality of toggle assemblies are meshed with transmission assemblies, a cylinder brush is arranged between the two sets of transmission assemblies; and a cleaning assembly is arranged at the other end of the transmission assembly; the base is used as a bearing structure of the detection device, and is used to bear the detection structure above; the slide is used to bear the steel plate to slide back and forth on the electric slide rail, so as to realize a series of steps including cleaning, coating of coupling agent, and ultrasonic detection, so as to complete stress detection; the cylinder brush is used to roll and coat the coupling agent evenly on the surface of the steel plate;

[0008] The transmission assembly includes a cam, which is located directly above the toggle assembly, and a plurality of ratchets are arranged at the bottom of the cam, and the plurality of ratchets are meshed with the ratchet block of the bottom toggle assembly. The top of the cam is movably connected to one end of a movable arm through a pin shaft, and the other end of the movable arm is fixedly connected to a side surface of a piston through a movable part. The piston is slidably installed inside the movable warehouse, and the cam passes through the ratchet at the bottom during rotation. When the cam rotates counterclockwise, the ratchet engages with the ratchet block, driving the slide and the steel plate carried between the slides to move to the right, and driving the piston to move to the left through the movable arm. When the cam rotates clockwise, the ratchet rolls over the ratchet block, the slide does not move, and drives the piston to move to the right inside the movable warehouse again; the movable arm is used to connect the cam and the piston, and the pin shaft is used to connect the cam and the movable arm; the movable part is used to connect the piston and the movable arm.

[0009] Preferably, two electric slide rails are respectively provided on both sides of the top of the base, and each electric slide rail is movably connected to a slide seat; the two slide seats are fixedly connected by a bearing plate, and the top of the bearing plate is used to bear the steel plate; an ultrasonic element is provided near the middle section of the top of the base, and an ultrasonic wedge is fixedly installed at the bottom of the ultrasonic element, and the ultrasonic wedge is located directly above the steel plate; the electric slide rail is used to drive the slide seat to return to the starting position after completing the stress detection of the steel plate; the ultrasonic element is used to control the ultrasonic wedge to perform ultrasonic detection on the surface of the steel plate.

[0010] Preferably, the transmission assembly also includes a mounting seat, and the two mounting seats are respectively fixedly connected to the top of the base on the outside of the two electric slide rails, and a connecting shaft is movably connected to the top of one side of each mounting seat, one end of which passes through the side of the mounting seat to the other side and is fixedly connected to the output end of the motor, and the motor is fixedly connected to the top of the outer side surface of one of the mounting seats; one end of the connecting shaft is fixedly connected to the center position of the cam, and the cam has a maximum left-right rotation angle of no more than 180° with the connecting shaft as the center of the circle; the mounting seat is used to fix the transmission assembly on the base, and the click is used to drive the cam to rotate, and the connecting shaft is used to connect the motor and the cam.

[0011] Preferably, the interior of the tube brush is a hollow structure for containing the coupling agent, and the surface of the tube brush is provided with holes for the coupling agent to flow out.

[0012] Preferably, a mounting hole is opened at one end of the cam side surface, the pin shaft is movably installed inside the mounting hole, and the other end of the pin shaft is movably arranged inside a circular hole opened at one end of the movable arm.

[0013] Preferably, the toggle assembly includes a mounting block, a mounting groove is provided inside the mounting block, through holes are provided on the inner walls on opposite sides of the mounting groove, two ends of a torsion spring are respectively passed through and connected inside the two through holes, the peripheral side surface of the torsion spring is installed and connected to the ratchet block, the ratchet block is meshed with the ratchet teeth, the mounting block is used to install the ratchet block, and the torsion spring is used to drive the ratchet block to move.

[0014] Preferably, the piston slides back and forth inside the movable bin, and the piston is connected to the inner wall of the movable bin by a sealing rubber ring; a rectangular hole is provided at one end of the bottom of the movable bin, an exhaust scoop is fixedly installed at the bottom of the rectangular hole, and a grille is installed at the connecting position of the exhaust scoop and the rectangular hole; the two opposite side surfaces of the bottom of the exhaust scoop are respectively connected to the two ends of the connecting rod, and a number of cleaning brushes are movably sleeved on the side surfaces around the connecting rod; through holes are provided on the two opposite oblique side surfaces of the exhaust scoop, and a slag discharge pipe parallel to the horizontal plane is welded on each through hole. When the piston moves to the left inside the movable bin, the air inside the movable bin is discharged through the exhaust scoop, and the air drives the cleaning brush to rotate, thereby cleaning the dust on the surface of the steel plate; when the piston moves to the right inside the movable bin, the external air is sucked inward through the exhaust scoop, and the air flow drives the cleaning brush to rotate, and part of the dust is discharged from the slag discharge pipe from both sides of the exhaust scoop, and very little dust is blocked by the grille, thereby preventing a large amount of dust from entering the movable bin.

[0015] Preferably, the ultrasonic element uses an ultrasonic wedge to detect residual stress using LCR waves. According to the acoustic elasticity principle, when the ultrasonic refracted longitudinal wave is transmitted in the stress direction, its sound velocity will change due to the influence of the stress in the transmission area. The sound velocity after the change is as shown in formula (1):

[0016] (1);

[0017] Where v is the sound velocity of the refracted longitudinal wave under stress, in m / s; is the speed of sound of refracted longitudinal waves in the absence of stress, in m / s; is stress, positive value is tensile stress, negative value is compressive stress, unit is MPa; k is the acoustic elastic coefficient;

[0018] By making an approximate linear treatment on equation (1), we can obtain the relationship between the critical refracted longitudinal wave velocity and the residual stress, as shown in equation (2):

[0019] (2);

[0020] in, is the change in sound speed, in m / s; is the stress change, in MPa;

[0021] The parameters k and is a constant, and the stress value can be calculated by measuring the change in ultrasonic wave velocity. In actual stress measurement, the change in the propagation time of ultrasonic waves within a fixed propagation distance L is used to reflect the change in sound velocity. Substituting it into formula (2), formula (3) is derived as follows:

[0022] (3);

[0023] Will Simplified to stress coefficient K, we get formula (4):

[0024] (4);

[0025] in, is the time for the critical refracted longitudinal wave to propagate within the propagation distance L when there is no stress; is the stress change, in MPa; It is the change in propagation time of ultrasonic critical refracted longitudinal wave caused by stress within the propagation distance L, in ns.

[0026] The present invention has the following beneficial effects:

[0027] 1. The present invention places the steel plate on the bearing plate arranged between the two slides by setting a transmission component. Initially, the steel plate is located at the leftmost side of the base. The motor is started to drive the cam to rotate. The cam first rotates counterclockwise, and the ratchet engages with the ratchet shift block, driving the slide and the steel plate carried between the slides to move to the right, and the piston is driven to move to the left through the movable arm. At this time, the air inside the movable bin is discharged through the exhaust scoop, and the air drives the cleaning brush to rotate to clean the dust on the surface of the steel plate. After the steel plate at one end is cleaned, a part of it is transmitted to the right at the same time. distance, and then start the motor to drive the cam to rotate clockwise, the ratchet rolls over the ratchet block, the slide does not move, and drives the piston to move to the right inside the movable chamber again; this action is repeated until the steel plate moves to the bottom of the cylinder brush. Since the cylinder brush is connected to the cam, when the cam rotates, it can drive the cylinder brush to rotate, and the cylinder brush evenly coats the coupling agent on the steel plate underneath. When the entire steel plate is cleaned and evenly coated with the coupling agent, it is transmitted to the bottom of the ultrasonic element, and the ultrasonic stress test is performed on the steel plate through the ultrasonic wedge, and finally the stress test result of the steel plate is obtained.

[0028] 2. The transmission component of the present invention can drive three components to move at the same time. First, when the cam rotates counterclockwise, it also drives the cleaning component to remove dust from the surface of the steel plate. The steel plate moves to the right, and the cylinder brush coats the surface of the steel plate with coupling agent. These three operations are completed simultaneously, which can greatly reduce the preparation time of the steel plate before ultrasonic testing, speed up the speed of steel plate stress testing, and improve the testing efficiency.

[0029] 3. The present invention can evenly coat the surface of the steel plate with coupling agent by setting a cylindrical brush, and can avoid damage to the steel plate caused by mechanical detection by using an ultrasonic measurement method, thereby improving the stress detection result of the steel plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 This is a schematic diagram of the overall structure of the stress detection device for steel plate production proposed by the present invention;

[0032] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0033] Figure 3 This is a schematic diagram of the internal structure of the movable chamber of the stress detection device for steel plate production proposed by the present invention;

[0034] Figure 4 This is a left-side structural schematic diagram of the stress detection device for steel plate production proposed by the present invention;

[0035] Figure 5 For the present invention Figure 4 Enlarged view of point B in the middle;

[0036] Figure 6 This is a schematic diagram of the structure of the ratchet block of the stress detection device for steel plate production proposed by the present invention.

[0037] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0038] 1. Base; 2. Electric slide rail; 3. Slide seat; 4. Mounting block; 5. Torsion spring; 6. Ratchet block; 7. Ultrasonic element; 8. Ultrasonic wedge; 9. Movable bin; 10. Exhaust scoop; 11. Grille; 12. Slag discharge pipe; 13. Connecting rod; 14. Cleaning brush; 15. Fixed rod; 16. Mounting seat; 17. Motor; 18. Connecting shaft; 19. Cam; 20. Brush; 21. Pin; 22. Movable arm; 23. Movable part; 24. Ratchet; 25. Piston; 26. Loading plate. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] See also Figure 1-6The present invention is a stress detection device for steel plate production, comprising a base 1, on which two slides 3 are movably mounted, and inside each slide 3 are fixedly arranged a plurality of long-strip toggle assemblies, the tops of the plurality of toggle assemblies are meshed with the transmission assembly, and a cylinder brush 20 is arranged between the two sets of transmission assemblies; and a cleaning assembly is arranged at the other end of the transmission assembly; the base 1 is used as a bearing structure of the detection device, and is used to bear the detection structure above; the slide 3 is used to bear the steel plate to slide back and forth on the electric slide rail 2, so as to realize a series of steps of cleaning, coating coupling agent, and ultrasonic detection, so as to complete the stress detection; the cylinder brush 20 is used to roll and coat the coupling agent evenly on the surface of the steel plate;

[0043] The transmission assembly includes a cam 19, which is located just above the toggle assembly, and a plurality of ratchet teeth 24 are arranged at the bottom of the cam 19, and the plurality of ratchet teeth 24 are meshed with the ratchet block 6 of the bottom toggle assembly. The top of the cam 19 is movably connected to one end of a movable arm 22 through a pin 21, and the other end of the movable arm 22 is fixedly connected to a side of a piston 25 through a movable member 23. The piston 25 is slidably installed inside the movable chamber 9. The cam 19 passes through the ratchet teeth 24 at the bottom during rotation. When the cam 19 rotates counterclockwise, When the cam 19 rotates clockwise, the ratchet 24 rolls over the ratchet block 6, the slide 3 does not move, and the piston 25 is driven to move to the right again inside the movable chamber 9; the movable arm 22 is used to connect the cam 19 and the piston 25, the pin 21 is used to connect the cam 19 and the movable arm 22; the movable part 23 is used to connect the piston 25 and the movable arm 22.

[0044] Among them, two electric slide rails 2 are respectively arranged on both sides of the top of the base 1, and each electric slide rail 2 is movably connected with a slide seat 3; the two slide seats 3 are fixedly connected by a bearing plate 26, and the top of the bearing plate 26 is used to bear the steel plate; an ultrasonic element 7 is arranged near the middle section of the top of the base 1, and an ultrasonic wedge 8 is fixedly installed at the bottom of the ultrasonic element 7, and the ultrasonic wedge 8 is located directly above the steel plate. The electric slide rail 2 is used to drive the slide seat 3 to return to the starting position after completing the stress detection of the steel plate; the ultrasonic element 7 is used to control the ultrasonic wedge 8 to perform ultrasonic detection on the surface of the steel plate.

[0045] Among them, the transmission assembly also includes a mounting seat 16, and the two mounting seats 16 are respectively fixedly connected to the top of the base 1 outside the two electric slide rails 2, and a connecting shaft 18 is movably connected to the top of one side of each mounting seat 16, one end of which passes through the side of the mounting seat 16 to the other side and is fixedly connected to the output end of the motor 17, and the motor 17 is fixedly connected to the top of the outer side of one of the mounting seats 16; one end of the connecting shaft 18 is fixedly connected to the center position of the cam 19, and the cam 19 takes the connecting shaft 18 as the center of the circle, and the maximum left-right rotation angle does not exceed 180°; the mounting seat 16 is used to fix the transmission assembly on the base 1, the click 17 is used to drive the cam 19 to rotate, and the connecting shaft 18 is used to connect the motor 17 and the cam 19.

[0046] The interior of the tube brush 20 is a hollow structure for containing the coupling agent, and the surface of the tube brush 20 is provided with holes for the coupling agent to flow out.

[0047] A mounting hole is provided at one end of the side of the cam 19 , a pin shaft 21 is movably installed inside the mounting hole, and the other end of the pin shaft 21 is movably arranged inside a circular hole provided at one end of the movable arm 22 .

[0048] Among them, the toggle assembly includes a mounting block 4, a mounting groove is opened inside the mounting block 4, and through holes are opened on the inner walls on both sides of the mounting groove. The two ends of a torsion spring 5 are respectively connected to the two through holes. The circumferential side surface of the torsion spring 5 is installed and connected with the ratchet block 6, and the ratchet block 6 is meshed with the ratchet teeth 24. The mounting block 4 is used to install the ratchet block 6, and the torsion spring 5 is used to drive the ratchet block 6 to move.

[0049] The piston 25 slides back and forth inside the movable chamber 9, and the piston 25 is connected to the inner wall of the movable chamber 9 through a sealing rubber ring; a rectangular hole is provided at one end of the bottom of the movable chamber 9, an exhaust scoop 10 is fixedly installed at the bottom of the rectangular hole, and a grille 11 is installed at the connection position between the exhaust scoop 10 and the rectangular hole; the two opposite side surfaces at the bottom of the exhaust scoop 10 are respectively connected to the two ends of the connecting rod 13, and a number of cleaning brushes 14 are movably sleeved on the side surfaces of the connecting rod 13; through holes are provided on the opposite oblique sides of the exhaust scoop 10, and a The slag discharge pipe 12 is parallel to the horizontal plane. When the piston 25 moves to the left inside the movable bin 9, the air inside the movable bin 9 is discharged through the exhaust scoop 10. The air drives the cleaning brush 14 to rotate, and the dust on the surface of the steel plate is cleaned. When the piston 25 moves to the right inside the movable bin 9, the external air is sucked in through the exhaust scoop 10. The air flow drives the cleaning brush 14 to rotate, and part of the dust is discharged from the slag discharge pipe 12 from both sides of the exhaust scoop 10. Very little dust is blocked by the grille to prevent a large amount of dust from entering the movable bin 9.

[0050] The ultrasonic element 7 uses LCR waves to detect residual stress through the ultrasonic wedge 8. According to the acoustic elasticity principle, when the ultrasonic refracted longitudinal wave is transmitted in the stress direction, its sound velocity will be affected by the stress in the transmission area and change. The sound velocity after the change is shown in formula (1):

[0051] (1);

[0052] Where v is the sound velocity of the refracted longitudinal wave under stress, in m / s; is the speed of sound of refracted longitudinal waves in the absence of stress, in m / s; is stress, positive value is tensile stress, negative value is compressive stress, unit is MPa; k is the acoustic elastic coefficient;

[0053] By making an approximate linear treatment on equation (1), we can obtain the relationship between the critical refracted longitudinal wave velocity and the residual stress, as shown in equation (2):

[0054] (2);

[0055] in, is the change in sound speed, in m / s; is the stress change, in MPa;

[0056] The parameters k and is a constant, and the stress value can be calculated by measuring the change in ultrasonic wave velocity. In actual stress measurement, the change in the propagation time of ultrasonic waves within a fixed propagation distance L is used to reflect the change in sound velocity. Substituting it into formula (2), formula (3) is derived as follows:

[0057] (3);

[0058] Will Simplified to stress coefficient K, we get formula (4):

[0059] (4);

[0060] in, is the time for the critical refracted longitudinal wave to propagate within the propagation distance L when there is no stress; is the stress change, in MPa; It is the change in propagation time of ultrasonic critical refracted longitudinal wave caused by stress within the propagation distance L, in ns.

[0061] When in use, the steel plate is placed on the bearing plate arranged between the two slides. Initially, the steel plate is located at the leftmost side of the base. The motor is started to drive the cam to rotate. The cam first rotates counterclockwise, and the ratchet engages with the ratchet shift block, driving the slide and the steel plate carried between the slides to move to the right, and the piston is driven to move to the left through the movable arm. At this time, the air inside the movable bin is discharged through the exhaust scoop, and the air drives the cleaning brush to rotate to clean the dust on the surface of the steel plate. After the steel plate at one end is cleaned, it is also transmitted to the right a certain distance. Then start the motor to drive the cam to rotate clockwise, the ratchet rolls over the ratchet block, the slide does not move, and drives the piston to move to the right inside the movable chamber again; this action is repeated until the steel plate moves to the bottom of the cylinder brush. Since the cylinder brush is connected to the cam, when the cam rotates, it can drive the cylinder brush to rotate, and the cylinder brush evenly coats the coupling agent on the steel plate directly below. When the entire steel plate is cleaned and evenly coated with the coupling agent, it is transmitted to the bottom of the ultrasonic element, and the ultrasonic stress test is performed on the steel plate through the ultrasonic wedge, and finally the stress test result of the steel plate is obtained.

[0062] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A stress detection device for steel plate production, comprising a base (1), characterized in that: Two slide seats (3) are movably mounted on the base (1), and a plurality of long-strip toggle assemblies are fixedly arranged inside each slide seat (3), and the tops of the plurality of toggle assemblies are meshed with the transmission assemblies, and a cylinder brush (20) is arranged between the two groups of transmission assemblies; and a cleaning assembly is arranged at the other end of the transmission assembly; the cylinder brush (20) has a hollow structure inside and is used to contain the coupling agent, and a hole is provided on the surface of the cylinder brush (20) for the coupling agent to flow out, and the cylinder brush 20 is used to roll and apply the coupling agent evenly on the surface of the steel plate; The transmission assembly comprises a cam (19), the cam (19) is located directly above the toggle assembly, and a plurality of ratchet teeth (24) are arranged at the bottom of the cam (19), and the plurality of ratchet teeth (24) are meshed with a ratchet toggle block (6) of the bottom toggle assembly. The top of the cam (19) is movably connected to one end of a movable arm (22) through a pin shaft (21), and the other end of the movable arm (22) is fixedly connected to a side surface of a piston (25) through a movable member (23), and the piston (25) is slidably installed inside the movable bin (9); The piston (25) slides back and forth inside the movable chamber (9), and the piston (25) is connected to the inner wall of the movable chamber (9) via a sealing rubber ring; a rectangular hole is provided at one end of the bottom of the movable chamber (9), an exhaust scoop (10) is fixedly installed at the bottom of the rectangular hole, and a grille (11) is installed at the connection position between the exhaust scoop (10) and the rectangular hole; two opposite side surfaces of the bottom of the exhaust scoop (10) are respectively connected to the two ends of a connecting rod (13), and a plurality of cleaning brushes (14) are movably sleeved on the side surfaces around the connecting rod (13); through holes are provided on two opposite oblique side surfaces of the exhaust scoop (10), and a slag discharge pipe (12) parallel to the horizontal plane is welded to each through hole.

2. A stress detection device for steel plate production according to claim 1, characterized in that: Two electric slide rails (2) are respectively arranged on both sides of the top of the base (1), and each electric slide rail (2) is movably connected to a slide seat (3); the two slide seats (3) are fixedly connected via a bearing plate (26), and the top of the bearing plate (26) is used to bear the steel plate; an ultrasonic element (7) is arranged near the middle section of the top of the base (1), and an ultrasonic wedge (8) is fixedly installed at the bottom of the ultrasonic element (7), and the ultrasonic wedge (8) is located directly above the steel plate.

3. A stress detection device for steel plate production according to claim 2, characterized in that: The transmission assembly also includes a mounting seat (16), two mounting seats (16) are respectively fixedly connected to the top of the base (1) outside the two electric slide rails (2), and a connecting shaft (18) is movably connected to the top of one side of each mounting seat (16), one end of which passes through the side of the mounting seat (16) to the other side and is fixedly connected to the output end of the motor (17), and the motor (17) is fixedly connected to the top of the outer side of one of the mounting seats (16); one end of the connecting shaft (18) is fixedly connected to the center position of the cam (19), and the cam (19) takes the connecting shaft (18) as the center of the circle, and the maximum left-right rotation angle does not exceed 180 degrees.

4. A stress detection device for steel plate production according to claim 3, characterized in that: A mounting hole is provided at one end of the side surface of the cam (19), the pin shaft (21) is movably mounted inside the mounting hole, and the other end of the pin shaft (21) is movably arranged inside a circular hole provided at one end of the movable arm (22).

5. A stress detection device for steel plate production according to claim 4, characterized in that: The shifting assembly comprises a mounting block (4), a mounting groove is provided inside the mounting block (4), through holes are provided on the inner walls on opposite sides of the mounting groove, two ends of a torsion spring (5) are respectively connected through the two through holes, the peripheral side surface of the torsion spring (5) is mounted and connected to a ratchet shifting block (6), and the ratchet shifting block (6) is meshed with a ratchet tooth (24).

6. A stress detection device for steel plate production according to claim 5, characterized in that: The ultrasonic element (7) uses LCR waves to detect residual stress through an ultrasonic wedge (8). According to the acoustic elasticity principle, when the ultrasonic refracted longitudinal wave is transmitted in the stress direction, its sound velocity will change due to the influence of the stress in the transmission area. The sound velocity after the change is shown in formula (1): Wherein, v is the sound velocity of the refracted longitudinal wave when there is stress, in m / s; v0 is the sound velocity of the refracted longitudinal wave when there is no stress, in m / s; σ is stress, positive value is tensile stress, negative value is compressive stress, in MPa; k is the acoustic elastic coefficient; By making an approximate linear treatment on equation (1), we can obtain the relationship between the critical refracted longitudinal wave velocity and the residual stress, as shown in equation (2): Among them, Δv is the change in sound velocity, in m / s; Δσ is the change in stress, in MPa; In formula (2), the parameters k and v0 are constants. The stress value can be calculated by measuring the change in ultrasonic wave velocity. In actual stress measurement, the change in the propagation time of ultrasonic waves within a fixed propagation distance L is used to reflect the change in sound velocity. Substituting it into formula (2), formula (3) is derived as follows: Will Simplified to stress coefficient K, we get formula (4): Δσ=KΔt (4) Wherein, t0 is the propagation time of the critical refracted longitudinal wave within the propagation distance L in the absence of stress; Δσ is the stress change, in MPa; Δt is the propagation time change of the critical refracted longitudinal wave of the ultrasound within the propagation distance L due to stress, in ns.

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