Ultrasonic detection device suitable for different metal bars

Abstract

The invention discloses an ultrasonic detection device suitable for different metal bars, and relates to the technical field of metal bar flaw detection, the ultrasonic detection device comprises a base, and the top end of the base is fixedly connected with two groups of slide rails. In the rotating process of a two-way threaded rod, two sets of sliding blocks are driven to get close to each other, so that side supporting balls abut against the outer wall of the metal bar, meanwhile, a first push rod is pushed, hydraulic oil flows into a second sleeve, a second push rod downwards pushes a support, and a contact plate downwards moves; therefore, the contact plate can be pushed downwards in the limiting process of the metal bars, the detection mechanism can be lifted in a self-adaptive mode when facing the metal bars with different diameters, the detection mechanism can adapt to the metal bars with different diameters, and the detection accuracy is improved by means of the characteristic that a detection supporting ball can rotate at any angle in a side ball seat. Therefore, when the metal bar is limited, rotation of the metal bar is not affected no matter where the supporting ball abuts against the outside of the metal bar.

Description

Technical Field

[0001] The present invention relates to the technical field of flaw detection for metal bars, and specifically to an ultrasonic detection device adapted to different metal bars. Background Art

[0002] Flaw detection refers to detecting cracks or defects inside metal materials. In related technologies, after the metal bars are cast, flaw detection equipment is generally used to perform flaw detection on them. Currently, common flaw detection methods include X-ray flaw detection, ultrasonic flaw detection, magnetic particle flaw detection, etc.; different flaw detection methods have different uses.

[0003] After searching the existing patents on the Chinese Patent Network (publication number: CN116930337U), a flaw detection device for metal bars is disclosed, which relates to the technical field of detection devices. It includes a flaw detection device and multiple material supporting devices; the flaw detection device includes a material supporting groove, a support frame, and an ultrasonic component; the material supporting device includes an electric telescopic rod, a fixing plate, a movable plate, a pressing plate, and a side electromagnet block; one end of the electric telescopic rod close to the support frame is fixed with a rectangular fixing plate, and the material of the fixing plate is iron; the movable plate is a rectangular plate made of a magnet; the number of pressing plates is two, and the two pressing plates are respectively located on both sides of the movable plate along the width direction, and the pressing plates are hinged to the movable plate; side electromagnet blocks are fixed on the opposite sides of the two pressing plates, and the side electromagnet blocks are DC electromagnets, which can solve the technical problems of not needing to install a matching material supporting semi-ring on the material supporting device according to the shape and diameter of the metal bar during flaw detection, reducing labor intensity, reducing production costs, and improving detection efficiency.

[0004] However, the above technical solution still has certain defects. During use, the ultrasonic component needs to be attached to the outer wall of the metal bar to more accurately and efficiently transmit ultrasonic waves into the metal bar, so as to more precisely perform flaw detection on the metal bar. However, in the above technical solution, the position of the ultrasonic component is relatively fixed during use, and the height of the ultrasonic component cannot be adaptively adjusted according to the diameter of the metal bar during flaw detection, resulting in that during the process of flaw detection on the metal bar, the ultrasonic component cannot always maintain a proper distance from the metal bar when dealing with metal bars of different diameters. Therefore, an ultrasonic detection device adapted to different metal bars is proposed. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide an ultrasonic detection device adapted to different metal bars, so as to solve the technical problem that the position of the ultrasonic component is relatively fixed during use and the height of the ultrasonic component cannot be adaptively adjusted according to the diameter of the metal bar during flaw detection as mentioned in the above background.

[0006] To achieve the above object, the present invention provides the following technical solution: An ultrasonic detection device adapted to different metal bars, including a base, two sets of slide rails are fixedly connected to the top end of the base, a clamping table is slidably connected to the top ends of the two sets of slide rails, a detection mechanism is slidably connected to the side wall of the base, and a hydraulic mechanism extending to the side wall of the detection mechanism is arranged on the inner wall of the clamping table; The clamping table includes a sliding plate, the sliding plate is slidably connected to the outer walls of the two sets of slide rails, a bidirectional threaded rod extending to the outside of the sliding plate is rotatably connected to the inner wall of the sliding plate, two sets of sliders are threadedly connected to the outer wall of the bidirectional threaded rod, a set of support plates are respectively fixedly connected to the top ends of the two sets of sliders, two sets of side ball seats are fixedly connected to the top ends of the support plates, and side support balls are slidably sleeved in the inner walls of the side ball seats; The hydraulic mechanism includes two sets of first sleeves, hydraulic oil is arranged inside the two sets of first sleeves, the two sets of first sleeves are fixedly connected to the inside of the sliding plate, a set of first pistons are respectively slidably sleeved in the inner walls of the two sets of first sleeves, a set of first push rods extending to the outside of the first sleeves are respectively fixedly connected to the side walls of the two sets of first pistons, one ends of the two sets of first push rods located outside the first sleeves are respectively fixedly connected to the side walls of a set of sliders, one ends of the two sets of first sleeves are respectively communicated with a set of hoses, one ends of the two sets of hoses are respectively communicated with a set of second sleeves, the second sleeves are fixedly connected to the side wall of the base, a second piston is slidably connected to the inner wall of the second sleeve, and a second push rod extending to the outside of the second sleeve is fixedly connected to the bottom end of the second piston, and the end of the second push rod located outside the second sleeve is connected to the detection mechanism.

[0007] As a preferred technical solution of the ultrasonic detection device adapted to different metal bars of the present invention, an internal hexagonal opening is provided at one end of the bidirectional threaded rod located outside the sliding plate, and the thread directions are opposite at the positions where the bidirectional threaded rod contacts the two sets of sliders.

[0008] As a preferred technical solution of the ultrasonic detection device adapted to different metal bars of the present invention, a limiting component is fixedly connected to the side wall of the sliding plate, the limiting component includes a support plate, the support plate is fixedly connected to the side wall of the sliding plate, two sets of chutes are provided at the top end of the support plate, a set of sliding rods are respectively slidably connected to the inner walls of the two sets of chutes, a bottom plate is fixedly connected between the two sets of sliding rods, a rear ball seat is fixedly connected to the top end of the bottom plate, and a rear support ball is sleeved in the inner wall of the rear ball seat.

[0009] As a preferred technical solution of the ultrasonic detection device adapted to different metal bars of the present invention, a plurality of limiting grooves are provided at the top end of the support plate, the limiting grooves are located between the two sets of chutes, and a convex block matching the shape of the limiting groove is fixedly connected to the bottom end of the support plate.

[0010] As a preferred technical solution of the ultrasonic detection device for adapting to different metal bars of the present invention, one end of the side wall of the sliding plate away from the limiting mechanism is fixedly connected with a front ball seat, and a front support ball is slidably sleeved on the inner wall of the front ball seat.

[0011] As a preferred technical solution of the ultrasonic detection device for adapting to different metal bars of the present invention, the detection mechanism includes a bracket, the bracket is slidably connected to the side wall of the base, the top end of the bracket is fixedly connected with a detection head, the bottom end of the detection head is fixedly connected with a contact plate, the main machine is fixedly connected to the side wall of the base, one end of the second push rod is fixedly connected to the bottom end of the side wall of the bracket, two groups of pushing blocks are slidably connected to the inner wall of the bracket, two groups of threaded push rods are threadedly connected to the side wall of the bracket, one end of the threaded push rod is rotatably connected to the side wall of the pushing block, the bottom end of the pushing block is hinged with a pushing plate, and the end of the pushing plate is hinged to one end of the contact plate.

[0012] As a preferred technical solution of the ultrasonic detection device for adapting to different metal bars of the present invention, a driving mechanism is arranged on the inner wall of the sliding plate. The driving mechanism includes a motor, the motor is fixedly connected to the inner wall of the sliding plate, two groups of rotating shafts are rotatably connected to the top end of the sliding plate, a plurality of rubber sleeves are respectively fixedly sleeved on the outer walls of the two groups of rotating shafts, a synchronous belt is fixedly connected to the outer walls of the two groups of rotating shafts, the other end of the synchronous belt is connected to the output end of the motor, and a driving gear is fixedly connected to the output end of the motor.

[0013] As a preferred technical solution of the ultrasonic detection device for adapting to different metal bars of the present invention, a support ring is fixedly connected to the bottom end of the sliding plate, a rotating ring is rotatably connected to the inner wall of the support ring, a reciprocating lead screw is threadedly connected to the inner wall of the rotating ring, both ends of the reciprocating lead screw are fixedly connected to the inner wall of the base, and a transmission gear is rotatably connected to the inside of the sliding plate.

[0014] As a preferred technical solution of the ultrasonic detection device for adapting to different metal bars of the present invention, the transmission gear is meshed with the driving gear, a toothed ring is fixedly sleeved on the outer wall of the rotating ring, and the toothed ring is meshed with the transmission gear.

[0015] In summary, the present invention mainly has the following beneficial effects: 1. In the process of the rotation of the bidirectional threaded rod of the present invention, two sets of sliders are driven to approach each other, so that the side support balls abut against the outer wall of the metal bar. At the same time, the first push rod is pushed, so that the hydraulic oil flows into the second sleeve, and then the second push rod pushes the bracket downward, so that the contact plate moves downward. Thus, when the metal bar is limited, the contact plate can be pushed downward. When facing metal bars with different diameters, the detection mechanism can adaptively lift, so that the detection mechanism can adapt to metal bars with different diameters. And by using the characteristic that the measuring support balls can rotate at any angle inside the side ball seats, when the metal bar is limited, no matter where the measuring support balls abut against the outside of the metal bar, it will not affect the rotation of the metal bar; 2. By rotating the threaded push rod of the present invention, the threaded push rod drives the pushing block to move, so that the contact plate is squeezed, and the contact plate is bent. Thus, when detecting flaws in metal bars with different diameters, the contact plate can change its arc according to the diameter of different metal bars, making the adaptability of the flaw detection device stronger. And by using the contact between the contact plate and the metal bar, ultrasonic waves can be better transmitted into the metal bar, and the detection head will not be worn; 3. The motor drives the rotating ring to rotate, so that the rotating ring drives the sliding plate to reciprocate on the top of the base, thus eliminating the operation of manually holding the detection head to detect on the metal bar surface, making the flaw detection process easier and more convenient. And it can drive the rotating belt to rotate, and use the rotation to drive the metal bar to rotate, so that during the flaw detection of the metal bar, it can be detected more comprehensively. The outer wall of the rotating shaft is provided with a rubber sleeve, so that when the rotating shaft drives the metal bar to rotate, there will be no slipping and idling phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the front view structural schematic diagram of the present invention; Figure 2 is the rear view structural schematic diagram of the present invention; Figure 3 is the upward view structural schematic diagram of the base removed state of the present invention; Figure 4 is the structural schematic diagram of the detection mechanism of the present invention; Figure 5 is the exploded structural schematic diagram of the hydraulic mechanism of the present invention; Figure 6 is the front view structural schematic diagram of the clamping table of the present invention; Figure 7 is the sectional structural schematic diagram of the clamping table of the present invention; Figure 8 is the structural schematic diagram of the limiting component of the present invention; Figure 9 is the structural schematic diagram of the front-end ball seat of the present invention; Figure 10 Schematic diagram of the internal structure of the second sleeve of the present invention.

[0017] In the figure: 1, base; 2, slide rail; 3, clamping table; 4, hydraulic mechanism; 5, detection mechanism; 6, drive mechanism; 301, sliding plate; 302, bidirectional threaded rod; 303, slider; 304, support plate; 305, side ball seat; 306, side support ball; 307, limit component; 3071, support plate; 3072, chute; 3073, sliding rod; 3074, bottom plate; 3075, rear ball seat; 3076, rear support ball; 3077, limit groove; 3078, convex block; 308, front ball seat; 309, front support ball; 401, first sleeve; 402, first piston; 403, first push rod; 404, second sleeve; 405, second piston; 406, second push rod; 407, hose; 501, bracket; 502, detection head; 503, contact plate; 504, main unit; 505, push block; 506, threaded push rod; 507, push plate; 601, motor; 602, rotating shaft; 603, rubber sleeve; 604, synchronous belt; 605, driving gear; 606, transmission gear; 607, support ring; 608, rotating ring; 609, gear ring; 610, reciprocating lead screw. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention.

[0019] Next, the embodiments of the present invention will be described according to the overall structure of the present invention.

[0020] An ultrasonic detection device adapted to different metal bars, as Figures 1 to 10 shown, includes a base 1. Two groups of slide rails 2 are fixedly connected to the top of the base 1. A clamping table 3 is slidably connected to the top of the two groups of slide rails 2. A detection mechanism 5 is slidably connected to the side wall of the base 1. A hydraulic mechanism 4 extending to the side wall of the detection mechanism 5 is arranged on the inner wall of the clamping table 3; The clamping table 3 includes a sliding plate 301. The sliding plate 301 is slidably connected to the outer walls of the two groups of slide rails 2. A bidirectional threaded rod 302 extending to the outside of the sliding plate 301 is rotatably connected to the inner wall of the sliding plate 301. Two groups of sliders 303 are threadedly connected to the outer wall of the bidirectional threaded rod 302. A group of support plates 304 are respectively fixedly connected to the tops of the two groups of sliders 303. Two groups of side ball seats 305 are fixedly connected to the tops of the support plates 304. Side support balls 306 are slidably sleeved in the inner walls of the side ball seats 305; The hydraulic mechanism 4 includes two groups of first sleeves 401. Hydraulic oil is provided inside the first sleeves 401. The two groups of first sleeves 401 are fixedly connected inside the sliding plate 301. A group of first pistons 402 are respectively sleeved on the inner walls of the two groups of first sleeves 401 in a sliding manner. A group of first push rods 403 extending to the outside of the first sleeves 401 are respectively fixedly connected to the side walls of the two groups of first pistons 402. One ends of the two groups of first push rods 403 located outside the first sleeves 401 are respectively fixedly connected to the side walls of a group of sliders 303. One ends of the two groups of sleeves are respectively communicated with a group of hoses 407. One ends of the two groups of hoses 407 are respectively communicated with a group of second sleeves 404. The second sleeves 404 are fixedly connected to the side wall of the base 1. A second piston 405 is slidably connected to the inner wall of the second sleeve 404. The bottom end of the second piston 405 is fixedly connected with a second push rod 406 extending to the outside of the second sleeve 404. One end of the second push rod 406 located outside the second sleeve 404 is connected to the detection mechanism 5. An internal hexagonal opening is provided at one end of the bidirectional threaded rod 302 located outside the sliding plate 301. The bidirectional threaded rod 302 has threads with opposite directions at the contact positions with the two groups of sliders 303. A limiting component 307 is fixedly connected to the side wall of the sliding plate 301. The limiting component 307 includes a support plate 3071. The support plate 3071 is fixedly connected to the side wall of the sliding plate 301. Two groups of sliding grooves 3072 are provided at the top end of the support plate 3071. A group of sliding rods 3073 are respectively slidably connected to the inner walls of the two groups of sliding grooves 3072. A bottom plate 3074 is fixedly connected between the two groups of sliding rods 3073. A rear ball seat 3075 is fixedly connected to the top end of the bottom plate 3074. A rear support ball 3076 is sleeved inside the inner wall of the rear ball seat 3075. A plurality of limiting grooves 3077 are provided at the top end of the support plate 3071. The limiting grooves 3077 are located between the two groups of sliding grooves 3072. A convex block 3078 matching the shape of the limiting groove 3077 is fixedly connected to the bottom end of the support plate 3071. A front ball seat 308 is fixedly connected to the end of the side wall of the sliding plate 301 away from the limiting mechanism. A front support ball 309 is slidably sleeved inside the inner wall of the front ball seat 308.

[0021] Place the metal rod to be detected on two rows of rubber sleeves 603. Insert an Allen wrench into the Allen opening on the bidirectional threaded rod 302, and then use the Allen wrench to drive the bidirectional threaded rod 302 to rotate. During the rotation of the bidirectional threaded rod 302, drive the two sets of sliders 303 to approach each other, so that the two sets of sliders 303 drive the two sets of support plates 304 to approach each other respectively. During the process of the two sets of support plates 304 approaching each other, drive the side ball seats 305 on both sides to approach each other, so that the side support balls 306 on both sides approach each other, making the side support balls 306 abut against the outer wall of the metal rod, thus preventing the metal rod from rolling off both sides of the side sliding plate 301 during the detection process. Before placing the metal rod on the rubber sleeve 603, push the support plate 3071 to flip, so that the support plate 3071 drives the convex block 3078 to flip, so that the convex block 3078 slides out of the limit groove 3077. Then pull the support plate 3071 so that the support plate 3071 drives the rear ball seat 3075 and the sliding plate 301 to move, so that the sliding rod 3073 slides in the chute 3072, so that the distance between the rear support ball 3076 and the front support ball increases or decreases. Then reverse the flip of the support plate 3071, so that the support plate 3071 drives the convex block 3078 to slide into another set of limit grooves 3077, so that the sliding rod 3073 cannot slide in the chute 3072. Then, after placing the metal bar on the rubber sleeve 603, the metal bar will not slide off from the front and rear sides of the sliding plate 301. During the process of the bidirectional threaded rod 302 driving the two sets of sliders 303 to approach each other, the two sets of sliders 303 respectively push a set of first push rods 403, so that the first push rods 403 push the first piston 402 to slide in the first sleeve 401, making the hydraulic oil in the first sleeve 401, so that the hydraulic oil flows into the second sleeve 404 through the hose 407, making the second piston 405 be pushed by the hydraulic oil to slide downward. During the process of the second piston 405 sliding downward, it pushes the second push rod 406 to extend out of the second sleeve 404, so that the second push rod 406 pushes the bracket 501 to slide downward, so that the bracket 501 drives the detection head and the contact plate 503 to move downward, so that the detection head can be used for metal bars of different brackets 501.

[0022] Please refer particularly to Figure 3 and Figure 2, the detection mechanism 5 includes a bracket 501 which is slidably connected to the side wall of the base 1. The top end of the bracket 501 is fixedly connected with a detection head 502, and the bottom end of the detection head 502 is fixedly connected with a contact plate 503. The side wall of the base 1 is fixedly connected with a main unit 504. The bottom end of the side wall of the bracket 501 is fixedly connected to one end of the second push rod 406. Two groups of pushing blocks 505 are slidably connected to the inner wall of the bracket 501. Two groups of threaded push rods 506 are threadedly connected to the side wall of the bracket 501. One end of the threaded push rod 506 is rotatably connected to the side wall of the pushing block 505. The bottom end of the pushing block 505 is hinged with a pushing plate 507, and the end of the pushing plate 507 is hinged to one end of the contact plate 503.

[0023] By rotating the two groups of threaded push rods 506, the two groups of threaded push rods 506 respectively push the two groups of pushing blocks 505 to approach each other, so that the two groups of pushing blocks 505 respectively push a group of pushing plates 507 to transmit the thrust to both sides of the contact plate 503, causing the contact plate 503 to bend. Thus, when detecting metal bars with different diameters, the curvature of the contact plate 503 can be adjusted so that the detection head 502 can transmit ultrasonic waves into the metal bar more fully.

[0024] Please refer specifically to Figure 2 、 Figure 3 and Figure 7 , a driving mechanism 6 is arranged on the inner wall of the sliding plate 301. The driving mechanism 6 includes a motor 601 which is fixedly connected to the inner wall of the sliding plate 301. Two groups of rotating shafts 602 are rotatably connected to the top end of the sliding plate 301. A plurality of rubber sleeves 603 are respectively fixedly sleeved on the outer walls of the two groups of rotating shafts 602. The outer walls of the two groups of rotating shafts 602 are fixedly connected with a synchronous belt 604, and the other end of the synchronous belt 604 is connected to the output end of the motor 601. The bottom end of the sliding plate 301 is fixedly connected with a support ring 607. A rotating ring 608 is rotatably connected to the inner wall of the support ring 607. A reciprocating lead screw 610 is threadedly connected to the inner wall of the rotating ring 608. The two ends of the reciprocating lead screw 610 are fixedly connected to the inner wall of the base 1. The output end of the motor 601 is fixedly connected with a transmission gear 606. A transmission gear 606 is rotatably connected to the inside of the sliding plate 301. The transmission gear 606 meshes with a driving gear 605. A toothed ring 609 is fixedly sleeved on the outer wall of the rotating ring 608, and the toothed ring 609 meshes with the transmission gear 606.

[0025] The driving gear 605 is rotated by the motor 601, so that the driving gear 605 drives the transmission gear 606 to rotate. At the same time, the motor 601 drives the two groups of rotating shafts 602 to rotate through the synchronous belt 604, so that the two groups of rotating shafts 602 drive the rubber sleeve 603 to rotate. During the rotation of the rubber sleeve 603, the metal bar is driven to rotate, so that the metal bar can be detected in all directions during the detection process. During this process, the transmission gear 606 drives the gear ring 609 to rotate, so that the gear ring 609 drives the rotating ring 608 to rotate. During the rotation of the rotating ring 608, through the thread between the rotating ring 608 and the reciprocating lead screw 610, the moving ring reciprocates on the outer wall of the reciprocating lead screw 610. During the reciprocating movement of the rotating ring 608, the support ring 607 is driven to move, and the support ring 607 drives the sliding plate 301 to move, thereby driving the metal bar towards the detection mechanism 5 and resetting after passing through the mechanism, so as to drive the metal bar to pass through the detection mechanism 5 to complete the detection and then reset.

[0026] During use, as the two-way threaded rod 302 rotates, the two groups of sliders 303 are driven to approach each other, so that the side support balls 306 abut against the outer wall of the metal bar. At the same time, the first push rod 403 is pushed, so that the hydraulic oil flows into the second sleeve 404, thereby causing the second push rod 406 to push the bracket 501 downward, so that the contact plate 503 moves downward, so as to realize that the contact plate 503 can be pushed downward during the process of limiting the metal bar. When facing metal bars of different diameters, the detection mechanism 5 can adaptively lift, so that the detection mechanism 5 can adapt to metal bars of different diameters. And by using the characteristic that the measuring support ball can rotate at any angle inside the side ball seat 305, when limiting the metal bar, no matter where the measuring support ball abuts against the outside of the metal bar, it will not affect the rotation of the metal bar. The parts not involved in this device are the same as the prior art or can be implemented by using the prior art.

[0027] Although the embodiments of the present invention have been shown and described, the specific embodiments are only explanations of the present invention and do not limit the invention. The specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can make modifications, substitutions and variations that do not contribute creatively to the embodiments according to needs, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. An ultrasonic detection device adapted to different metal bars, comprising a base (1), characterized in that: The top of the base (1) is fixedly connected to two groups of slide rails (2), the tops of the two groups of slide rails (2) are slidably connected to a clamping platform (3), the side wall of the base (1) is slidably connected to a detection mechanism (5), and the inner wall of the clamping platform (3) is provided with a hydraulic mechanism (4) extending to the side wall of the detection mechanism (5); The clamping platform (3) comprises a sliding plate (301), the sliding plate (301) is slidably connected to the outer walls of the two groups of slide rails (2), the inner wall of the sliding plate (301) is rotatably connected to a bidirectional threaded rod (302) extending to the outside of the sliding plate (301), the outer wall of the bidirectional threaded rod (302) is threadedly connected to two groups of sliders (303), the top ends of the two groups of sliders (303) are respectively fixedly connected to a group of support plates (304), the top ends of the support plates (304) are fixedly connected to two groups of side ball seats (305), and the inner wall sliding sleeves of the side ball seats are provided with side support balls (306); The hydraulic mechanism (4) comprises two groups of first sleeves (401), hydraulic oil is provided inside the first sleeves (401), the two groups of first sleeves (401) are fixedly connected to the inside of the sliding plate (301), the inner walls of the two groups of first sleeves (401) are respectively slidably sleeved with a group of first pistons (402), the side walls of the two groups of first pistons (402) are respectively fixedly connected with a group of first push rods (403) extending to the outside of the first sleeves (401), and one end of the two groups of first push rods (403) located outside the first sleeves (401) is respectively fixedly connected to a group of sliders (303). ), the ends of the two groups of the first sleeves (401) are respectively connected to a group of hoses (407), the ends of the two groups of the hoses (407) are respectively connected to a group of second sleeves (404), the second sleeves (404) are fixedly connected to the side wall of the base (1), the inner wall of the second sleeve (404) is slidably connected to a second piston (405), the bottom end of the second piston (405) is fixedly connected to a second push rod (406) extending to the outside of the second sleeve (404), and one end of the second push rod (406) located outside the second sleeve (404) is connected to the detection mechanism (5).

2. The ultrasonic detection device adapted to different metal bars according to claim 1, characterized in that: One end of the bidirectional threaded rod (302) located outside the sliding plate (301) is provided with a hexagonal opening, and the bidirectional threaded rod (302) is provided with threads in opposite directions at the position where it contacts the two sets of sliding blocks (303).

3. The ultrasonic detection device adapted to different metal bars according to claim 1, characterized in that: The side wall of the sliding plate (301) is fixedly connected to a limiting assembly (307), and the limiting assembly (307) comprises a supporting plate (3071), the supporting plate (3071) is fixedly connected to the side wall of the sliding plate (301), two groups of sliding grooves (3072) are provided at the top of the supporting plate (3071), the inner walls of the two groups of sliding grooves (3072) are respectively slidably connected to a group of sliding rods (3073), a bottom plate (3074) is fixedly connected between the two groups of sliding rods (3073), a rear ball seat (3075) is fixedly connected to the top of the bottom plate (3074), and a rear supporting ball (3076) is sleeved on the inner wall of the rear ball seat (3075).

4. The ultrasonic detection device adapted to different metal bars according to claim 3, characterized in that: The top of the support plate (3071) is provided with a plurality of groups of limiting grooves (3077), the limiting grooves (3077) being located between two groups of sliding grooves (3072), and the bottom of the support plate (3071) is fixedly connected with a protrusion (3078) having a shape matching that of the limiting grooves (3077).

5. The ultrasonic detection device adapted to different metal bars according to claim 1, characterized in that: One end of the side wall of the sliding plate (301) away from the limiting mechanism is fixedly connected to a front end ball seat (308), and the inner wall sliding sleeve of the front end ball seat (308) is provided with a front end supporting ball (309).

6. The ultrasonic detection device adapted to different metal bars according to claim 1, characterized in that: The detection mechanism (5) comprises a bracket (501), the bracket (501) is slidably connected to the side wall of the base (1), the top end of the bracket (501) is fixedly connected to a detection head (502), the bottom end of the detection head (502) is fixedly connected to a contact plate (503), the side wall of the base (1) is fixedly connected to a host (504), the bottom end of the side wall of the bracket (501) is fixedly connected to one end of a second push rod (406), the inner wall of the bracket (501) is slidably connected to two groups of push blocks (505), the side wall of the bracket (501) is threadedly connected to two groups of threaded push rods (506), one end of the threaded push rod (506) is rotatably connected to the side wall of the push block (505), the bottom end of the push block (505) is hinged to a push plate (507), and the end of the push plate (507) is hinged to one end of the contact plate (503).

7. The ultrasonic detection device adapted to different metal bars according to claim 6, characterized in that: The inner wall of the sliding plate (301) is provided with a driving mechanism (6), the driving mechanism (6) comprising a motor (601), the motor (601) being fixedly connected to the inner wall of the sliding plate (301), the top end of the sliding plate (301) being rotatably connected to two groups of rotating shafts (602), the outer walls of the two groups of rotating shafts (602) being respectively fixedly sleeved with a plurality of groups of rubber sleeves (603), the outer walls of the two groups of rotating shafts (602) being fixedly connected to synchronous belts (604), the other end of the synchronous belt (604) being connected to the output end of the motor (601), and the output end of the motor (601) being fixedly connected to a driving gear (605).

8. The ultrasonic detection device adapted to different metal bars according to claim 1, characterized in that: The bottom end of the sliding plate (301) is fixedly connected to a support ring (607), the inner wall of the support ring (607) is rotatably connected to a rotating ring (608), the inner wall of the rotating ring (608) is threadedly connected to a reciprocating screw rod (610), both ends of the reciprocating screw rod (610) are fixedly connected to the inner wall of the base (1), and the interior of the sliding plate (301) is rotatably connected to a transmission gear (606).

9. The ultrasonic detection device adapted to different metal bars according to claim 8, characterized in that: The transmission gear (606) meshes with the driving gear (605); a gear ring (609) is fixedly mounted on the outer wall of the rotating ring (608); and the gear ring (609) meshes with the transmission gear (606).

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