A hand-held ultrasonic flaw detector

Abstract

This invention belongs to the field of flaw detector technology, specifically a handheld ultrasonic flaw detector. It includes a flaw detector body with a fixed frame at its rear end. Two integrally structured supports are provided on both sides of the fixed frame. A sliding groove is formed at the rear end of each support, within which a slider is slidably connected. A connecting rod is fixedly connected to the rear end of the slider, and a spring is fixedly connected to the inner side of the slider. The other side of the spring is fixedly connected to the side wall of the sliding groove. A single protective side cover is fixedly connected to the outer side of the two connecting rods on the same side. The protective side cover has a U-shaped cross-section. The flaw detector body is enclosed within the two protective side covers. The fixed frame and the flaw detector body are detachably connected. End protection mechanisms are provided at the top and bottom of the fixed frame. In this invention, the two protective side covers and the protective end covers buffer the impact force upon impact, thus providing comprehensive drop protection for the flaw detector body.

Description

Technical Field

[0001] This invention relates to the field of flaw detector technology, and more particularly to a handheld ultrasonic flaw detector. Background Technology

[0002] An ultrasonic flaw detector is a portable industrial non-destructive testing instrument that can quickly, conveniently, non-destructively, and accurately detect, locate, evaluate, and diagnose various internal defects (cracks, porosity, air holes, inclusions, etc.) in workpieces. It can be used in both laboratories and engineering fields. Ultrasonic testing utilizes the characteristic of ultrasonic waves entering the interior of a product and reflecting off the edges of the cross-sections as they travel from one section to another to detect product defects.

[0003] Existing handheld ultrasonic flaw detectors have poor drop resistance. When dropped to the ground, they are easily damaged by impact, and may even cause malfunctions in the precision components inside the flaw detector, causing great trouble for the staff. Therefore, corresponding improvements have been made to address this problem. Summary of the Invention

[0004] To address the technical problem of poor drop resistance in existing flaw detectors, this invention proposes a handheld ultrasonic flaw detector.

[0005] This invention proposes a handheld ultrasonic flaw detector, comprising a flaw detector body, a fixed frame at the rear end of the flaw detector body, two integrally structured supports on both sides of the fixed frame, a sliding groove at the rear end of each support, a slider slidably connected within the sliding groove, a connecting rod fixedly connected to the rear end of the slider, a spring fixedly connected to the inner side of the slider, and the other side of the spring fixedly connected to the side wall of the sliding groove. The outer sides of the two connecting rods on the same side are fixedly connected to the same protective side cover, the protective side cover having a U-shaped cross-section. The flaw detector body is enclosed within the two protective side covers. The fixed frame and the flaw detector body are detachably connected. End protection mechanisms are provided at the top and bottom of the fixed frame.

[0006] Preferably, the end protection mechanism includes a protective end cap with an L-shaped cross-section. Movable grooves are provided at the top and bottom of the fixing frame, and a movable block is slidably connected within each groove. A support rod is fixedly connected to the top of the movable block, and the protective end cap is fixedly connected to the top of the support rod. Two symmetrically distributed locking rods are provided at the bottom of the protective end cap, and the locking rods and the protective end cap are an integral structure. A latch is provided at the top and bottom of the protective end cap, and the surface of the latch that contacts the locking rod is an inclined surface. An arc-shaped locking head is provided at the top of the inclined surface of the latch, and a matching groove is provided at the contact position between the locking rod and the locking head.

[0007] Preferably, a threaded groove is provided at the rear end of the flaw detector body, a threaded hole is provided through the rear end of the fixing frame, a fixing plate is provided at the rear end of the fixing frame, and a first screw is threadedly connected to the rear end of the fixing plate. The first screw and the threaded groove cooperate to fix the fixing plate and the fixing frame to the flaw detector body.

[0008] Preferably, two sliding sleeves are symmetrically distributed up and down at the rear end of the fixing plate. A directional groove is provided at the top of the sliding sleeve. The cross section of the directional groove is "convex" shaped. A directional block is slidably connected in the directional groove. The same hand strap is fixedly connected between the two directional blocks.

[0009] Preferably, a fixing block is provided in the directional groove, and a second screw is threadedly connected to the rear end of the fixing block. The second screw fixes the fixing block in the directional groove.

[0010] Preferably, a first airbag is fixedly connected to the opposite side of each of the two protective side covers, and a second airbag is fixedly connected to the opposite side of each of the two protective end covers. The first airbag and the second airbag are both connected to an inflation mechanism.

[0011] Preferably, the inflation mechanism includes two inflation boxes. The inflation boxes are arranged between the two protective side covers. A fixing rod is fixedly connected to one side of the inflation box. The fixing rod is fixedly connected to the adjacent protective side cover. A push plate is provided in the inflation box. A push rod is fixedly connected to the side of the push plate away from the fixing rod. The other side of the push rod penetrates through the inflation box and is fixedly connected to the adjacent protective side cover. A first hose and a second hose are connected to the side of the inflation box away from the push plate. The other ends of the first hose and the second hose are respectively connected to the adjacent second airbag and the first airbag.

[0012] Preferably, the inner wall of the front end of the protective side cover is an inclined surface, which slopes upward from inside to outside.

[0013] Preferably, dense anti-slip convex grains are fixedly connected to the inclined surface of the protective side cover. The cross-sectional contour of the anti-slip convex grains is wavy.

[0014] Compared with the prior art, the present invention provides a handheld ultrasonic flaw detector, which has the following beneficial effects:

[0015] 1. In the event of a drop, if the protective side cover is impacted, the protective side cover and connecting rod move inward along the slide groove with the slider, compressing the spring and creating a buffer under its elastic force, thus providing drop protection on both sides of the flaw detector body. If the protective end cover is impacted, the protective end cover moves inward along the movable groove with the support rod and movable block. The locking rod on the protective end cover can push the inclined surface on the protective side cover, causing both protective side covers to move towards the middle simultaneously, compressing the spring and thus providing a buffer, thereby providing comprehensive drop protection for the flaw detector body. By setting an arc-shaped locking head and a locking rod that matches the locking head, when the protective end cover is in the initial position, the locking rod and locking head contact each other to effectively position the protective end cover.

[0016] 2. This handheld ultrasonic flaw detector features a fixed plate and a first screw that securely mounts the fixed plate and frame to the flaw detector body, facilitating easy assembly and disassembly. A hand strap allows the hand to pass through the strap with the palm facing the fixed plate for easy gripping. The rubber hand strap provides cushioning protection when the rear of the flaw detector body is impacted. The U-shaped protective side covers, encasing the flaw detector body, protect the front of the flaw detector body from impacts, providing comprehensive drop resistance.

[0017] 3. This handheld ultrasonic flaw detector, by being equipped with an inflation box, ensures that when the protective end cap and protective side cap are directly impacted, the two protective side caps move closer to each other, allowing the push plate to move within the inflation box. This forces the gas inside the inflation box into the first and second flexible tubes, which then enter the corresponding first and second airbags, inflating them and further buffering the impact force, thereby improving the drop resistance.

[0018] 4. In this handheld ultrasonic flaw detector, the inner wall of the front end of the protective side cover is an upward sloping surface from the inside out. When the protective side cover moves closer to the flaw detector body, the sloping surface gradually presses against the button on the flaw detector body. Since the button is made of elastic material and can be pressed up and down, the impact force can be buffered by the button. It is also equipped with densely distributed anti-slip protrusions. The cross-sectional profile of the anti-slip protrusions is wavy. When the anti-slip protrusions come into contact with the button, they form a stable contact with the button through their wavy profile, which improves the anti-slip effect and enhances the buffering effect of the button. Attached Figure Description

[0019] Figure 1 This is a front view schematic diagram of a handheld ultrasonic flaw detector proposed in this invention.

[0020] Figure 2 This is a rear view schematic diagram of a handheld ultrasonic flaw detector proposed in this invention.

[0021] Figure 3 This is an exploded schematic diagram of a handheld ultrasonic flaw detector proposed in this invention.

[0022] Figure 4 This is a schematic diagram of the mounting frame structure of a handheld ultrasonic flaw detector proposed in this invention;

[0023] Figure 5 This is a schematic diagram of the front view of the protective side cover structure of a handheld ultrasonic flaw detector proposed in this invention.

[0024] Figure 6 This is a schematic diagram of the fixed plate structure of a handheld ultrasonic flaw detector proposed in this invention;

[0025] Figure 7 This is an enlarged structural diagram of point A of a handheld ultrasonic flaw detector proposed in this invention.

[0026] Figure 8 This is a schematic diagram of the air box installation structure of a handheld ultrasonic flaw detector proposed in this invention.

[0027] Figure 9 This is a magnified structural diagram of point B of a handheld ultrasonic flaw detector proposed in this invention.

[0028] Figure 10 This is a schematic diagram of the front view of the air box installation structure of a handheld ultrasonic flaw detector proposed in this invention.

[0029] Figure 11 This is a schematic diagram of the anti-slip protrusion mounting structure of a handheld ultrasonic flaw detector proposed in this invention.

[0030] Figure 12 This is an enlarged structural diagram of point C of a handheld ultrasonic flaw detector proposed in this invention.

[0031] In the diagram: 1. Flaw detector body; 2. Fixing frame; 3. Support; 4. Slide groove; 5. Slider; 6. Spring; 7. Connecting rod; 8. Protective side cover; 9. Movable groove; 10. Movable block; 11. Support rod; 12. Protective end cover; 13. Bayonet; 14. Clamp head; 15. Clamping rod; 16. Threaded groove; 17. Threaded hole; 18. Fixing plate; 19. First screw; 20. Sliding sleeve; 21. Orientation groove; 22. Orientation block; 23. Hand strap; 24. Fixing block; 25. Second screw; 26. First airbag; 27. Fixing rod; 28. Inflation box; 29. ​​Push plate; 30. Push rod; 31. First hose; 32. Second hose; 33. Second airbag; 34. Anti-slip protrusion. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] Example 1

[0034] Reference Figure 1-10 A handheld ultrasonic flaw detector includes a flaw detector body 1, a fixing frame 2 at the rear end of the flaw detector body 1, two integrally structured supports 3 on both sides of the fixing frame 2, a sliding groove 4 at the rear end of the support 3, a slider 5 slidably connected in the sliding groove 4, a connecting rod 7 fixedly connected to the rear end of the slider 5, a spring 6 fixedly connected to the inner side of the slider 5, and the other side of the spring 6 fixedly connected to the side wall of the sliding groove 4. The outer sides of the two connecting rods 7 on the same side are fixedly connected to the same protective side cover 8, the protective side cover 8 has a U-shaped cross section, the flaw detector body 1 is wrapped inside the two protective side covers 8, the fixing frame 2 and the flaw detector body 1 are detachably connected, and end protection mechanisms are provided at the top and bottom of the fixing frame 2.

[0035] Furthermore, the end protection mechanism includes a protective end cap 12, which has an L-shaped cross-section. The top and bottom of the fixing frame 2 are provided with movable grooves 9, and movable blocks 10 are slidably connected in the movable grooves 9. A support rod 11 is fixedly connected to the top of the movable block 10. The protective end cap 12 is fixedly connected to the top of the support rod 11. The bottom of the protective end cap 12 is provided with two symmetrically distributed locking rods 15. The locking rods 15 and the protective end cap 12 are an integral structure. The top and bottom of the protective side cover 8 are provided with latches 13. The side of the latches 13 that contacts the locking rods 15 is a slope. The top of the slope of the latches 13 is provided with an arc-shaped locking head 14. The contact position between the locking rods 15 and the locking head 14 is provided with a matching groove.

[0036] Furthermore, the rear end of the flaw detector body 1 is provided with a threaded groove 16, the rear end of the fixing frame 2 is provided with a threaded hole 17, the rear end of the fixing frame 2 is provided with a fixing plate 18, the rear end of the fixing plate 18 is threadedly connected with a first screw 19, the first screw 19 and the threaded groove 16 cooperate to fix the fixing plate 18 and the fixing frame 2 to the flaw detector body 1.

[0037] Furthermore, the rear end of the fixed plate 18 is fixedly connected to two symmetrically distributed sliding sleeves 20. The top of the sliding sleeve 20 is provided with an orientation groove 21. The cross section of the orientation groove 21 is "convex". An orientation block 22 is slidably connected in the orientation groove 21. The same hand strap 23 is fixedly connected between the two orientation blocks 22. The hand strap 23 is made of rubber.

[0038] Furthermore, a fixing block 24 is provided in the directional groove 21, and a second screw 25 is threadedly connected to the rear end of the fixing block 24, which fixes the fixing block 24 in the directional groove 21.

[0039] Furthermore, a first airbag 26 is fixedly connected to the opposite side of each of the two protective side covers 8, and a second airbag 33 is fixedly connected to the opposite side of each of the two protective end covers 12. Both the first airbag 26 and the second airbag 33 are connected to an inflation mechanism.

[0040] Furthermore, the inflation mechanism includes two inflation boxes 28, which are disposed between two protective side covers 8. A fixing rod 27 is fixedly connected to one side of the inflation box 28, and the fixing rod 27 is fixedly connected to the adjacent protective side cover 8. A push plate 29 is provided inside the inflation box 28. A push rod 30 is fixedly connected to the side of the push plate 29 away from the fixing rod 27. The other side of the push rod 30 passes through the inflation box 28 and is fixedly connected to the adjacent protective side cover 8. A first hose 31 and a second hose 32 are connected to the side of the inflation box 28 away from the push plate 29. The other ends of the first hose 31 and the second hose 32 are respectively connected to the adjacent second airbag 33 and the first airbag 26.

[0041] Working principle: Upon impact, if the protective side cover 8 is hit, it and the connecting rod 7 move inward along the slide groove 4 with the slider 5, compressing the spring 6 and creating a buffer under its elastic force. This provides impact protection on both sides of the flaw detector body 1. If the protective end cover 12 is hit, it moves inward along the movable groove 9 with the support rod 11 and the movable block 10. The locking rod 15 on the protective end cover 12 can push the inclined surface on the protective side cover 8, causing the two... The protective side covers 8 move simultaneously towards the center, compressing the spring 6 to provide cushioning and thus providing comprehensive drop protection for the flaw detector body 1. With an arc-shaped locking head 14 and a matching locking rod 15, the locking rod 15 and locking head 14 contact each other when the protective end cover 12 is in its initial position, effectively positioning the protective end cover 12. Furthermore, a fixing plate 18 is provided, and a first screw 19 securely mounts the fixing plate 18 and the fixing frame 2 onto the flaw detector body 1. This design facilitates easy assembly and disassembly. A hand strap 23 is included, allowing the hand to pass through it with the palm facing the fixed plate 18 for easy gripping of the flaw detector. Since the hand strap 23 is made of rubber, it provides cushioning protection when the rear of the flaw detector body 1 is impacted. Because the protective side covers 8 have a U-shaped cross-section, and the flaw detector body 1 is enclosed within the two protective side covers 8, it provides protection for the front of the flaw detector body 1 when impacted, achieving comprehensive drop resistance. Furthermore, an inflation box 28 is provided. Regardless of whether the protective end cap 12 and the protective side cap 8 are directly impacted, the two protective side caps 8 move closer to each other, which allows the push plate 29 to move within the inflation box 28. This forces the gas in the inflation box 28 into the first hose 31 and the second hose 32, and then into the corresponding first airbag 26 and second airbag 33, inflating the first airbag 26 and the second airbag 33. This further buffers the impact force and improves the drop resistance.

[0042] Example 2

[0043] Reference Figure 1-12 A handheld ultrasonic flaw detector includes a flaw detector body 1, a fixing frame 2 at the rear end of the flaw detector body 1, two integrally structured supports 3 on both sides of the fixing frame 2, a sliding groove 4 at the rear end of the support 3, a slider 5 slidably connected in the sliding groove 4, a connecting rod 7 fixedly connected to the rear end of the slider 5, a spring 6 fixedly connected to the inner side of the slider 5, and the other side of the spring 6 fixedly connected to the side wall of the sliding groove 4. The outer sides of the two connecting rods 7 on the same side are fixedly connected to the same protective side cover 8, the protective side cover 8 has a U-shaped cross section, the flaw detector body 1 is wrapped inside the two protective side covers 8, the fixing frame 2 and the flaw detector body 1 are detachably connected, and end protection mechanisms are provided at the top and bottom of the fixing frame 2.

[0044] Furthermore, the end protection mechanism includes a protective end cap 12, which has an L-shaped cross-section. The top and bottom of the fixing frame 2 are provided with movable grooves 9, and movable blocks 10 are slidably connected in the movable grooves 9. A support rod 11 is fixedly connected to the top of the movable block 10. The protective end cap 12 is fixedly connected to the top of the support rod 11. The bottom of the protective end cap 12 is provided with two symmetrically distributed locking rods 15. The locking rods 15 and the protective end cap 12 are an integral structure. The top and bottom of the protective side cover 8 are provided with latches 13. The side of the latches 13 that contacts the locking rods 15 is a slope. The top of the slope of the latches 13 is provided with an arc-shaped locking head 14. The contact position between the locking rods 15 and the locking head 14 is provided with a matching groove.

[0045] Furthermore, the rear end of the flaw detector body 1 is provided with a threaded groove 16, the rear end of the fixing frame 2 is provided with a threaded hole 17, the rear end of the fixing frame 2 is provided with a fixing plate 18, the rear end of the fixing plate 18 is threadedly connected with a first screw 19, the first screw 19 and the threaded groove 16 cooperate to fix the fixing plate 18 and the fixing frame 2 to the flaw detector body 1.

[0046] Furthermore, the rear end of the fixed plate 18 is fixedly connected to two symmetrically distributed sliding sleeves 20. The top of the sliding sleeve 20 is provided with an orientation groove 21. The cross section of the orientation groove 21 is "convex". An orientation block 22 is slidably connected in the orientation groove 21. The same hand strap 23 is fixedly connected between the two orientation blocks 22. The hand strap 23 is made of rubber.

[0047] Furthermore, a fixing block 24 is provided in the directional groove 21, and a second screw 25 is threadedly connected to the rear end of the fixing block 24, which fixes the fixing block 24 in the directional groove 21.

[0048] Furthermore, a first airbag 26 is fixedly connected to the opposite side of each of the two protective side covers 8, and a second airbag 33 is fixedly connected to the opposite side of each of the two protective end covers 12. Both the first airbag 26 and the second airbag 33 are connected to an inflation mechanism.

[0049] Furthermore, the inflation mechanism includes two inflation boxes 28, which are disposed between two protective side covers 8. A fixing rod 27 is fixedly connected to one side of the inflation box 28, and the fixing rod 27 is fixedly connected to the adjacent protective side cover 8. A push plate 29 is provided inside the inflation box 28. A push rod 30 is fixedly connected to the side of the push plate 29 away from the fixing rod 27. The other side of the push rod 30 passes through the inflation box 28 and is fixedly connected to the adjacent protective side cover 8. A first hose 31 and a second hose 32 are connected to the side of the inflation box 28 away from the push plate 29. The other ends of the first hose 31 and the second hose 32 are respectively connected to the adjacent second airbag 33 and the first airbag 26.

[0050] Furthermore, the inner wall of the front end of the protective side cover 8 is a slope, which slopes upward from the inside out.

[0051] Furthermore, the inclined surface of the protective side cover 8 is fixedly connected with a dense array of anti-slip protrusions 34, the cross-sectional profile of which is wavy.

[0052] Working principle: Upon impact, if the protective side cover 8 is hit, it and the connecting rod 7 move inward along the slide groove 4 with the slider 5, compressing the spring 6 and creating a buffer under its elastic force. This provides impact protection on both sides of the flaw detector body 1. If the protective end cover 12 is hit, it moves inward along the movable groove 9 with the support rod 11 and the movable block 10. The locking rod 15 on the protective end cover 12 pushes the inclined surface on the protective side cover 8, causing both protective side covers 8 to move towards the center simultaneously, compressing the spring 6 and providing a buffer. This provides comprehensive impact protection for the flaw detector body 1. By providing an arc-shaped locking head 14 and a locking rod 15 that matches the locking head 14, the locking rod 15 and the locking head 14 can contact each other when the protective end cover 12 is in its initial position, effectively positioning the protective end cover 12. Furthermore, a fixing plate 18 is provided, and a first screw 19 securely mounts the fixing plate 18 and the fixing frame 2 onto the flaw detector body 1, thus facilitating assembly and disassembly. A hand strap 23 is also provided, allowing the hand to pass through the hand strap 23 with the palm facing the fixing plate 18 for easy gripping of the flaw detector. Since the hand strap 23 is made of rubber, it provides cushioning when the rear of the flaw detector body 1 is dropped. The impact protection is effective because the protective side cover 8 has a U-shaped cross-section, and the flaw detector body 1 is enclosed within the two protective side covers 8. This provides protection for the flaw detector body 1 when its front is impacted, achieving comprehensive impact resistance. Furthermore, an inflation box 28 is provided. Regardless of whether the protective end cover 12 or the protective side cover 8 is directly impacted, the two protective side covers 8 move closer to each other, allowing the push plate 29 to move within the inflation box 28. This forces the gas within the inflation box 28 into the first hose 31 and the second hose 32, and then into the corresponding first airbag 26 and second airbag 33, inflating the first airbag 26 and the second airbag 33. The air cushioning further reduces the impact force, thus improving the drop resistance. Furthermore, since the inner wall of the front end of the protective side cover 8 is an upward sloping surface from the inside out, when the protective side cover 8 moves closer to the flaw detector body 1, the sloping surface will gradually press against the button on the flaw detector body 1. Since the button is made of elastic material and can be pressed up and down, the impact force can be cushioned by the button. It is also equipped with densely distributed anti-slip protrusions 34. The cross-sectional profile of the anti-slip protrusions 34 is wavy, so when the anti-slip protrusions 34 come into contact with the button, they form a stable contact with the button through their wavy profile, improving the anti-slip effect and thus enhancing the cushioning effect of the button.

[0053] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

Claims

1. A handheld ultrasonic flaw detector, comprising a flaw detector body (1), characterized in that, The flaw detector body (1) is provided with a fixed frame (2) at the rear end. The fixed frame (2) is provided with two integral support (3) on both sides. The support (3) has a sliding groove (4) at the rear end. A slider (5) is slidably connected in the sliding groove (4). A connecting rod (7) is fixedly connected to the rear end of the slider (5). A spring (6) is fixedly connected to the inner side of the slider (5). The other side of the spring (6) is fixedly connected to the side wall of the sliding groove (4). The outer side of the two connecting rods (7) on the same side is fixedly connected to the same protective side cover (8). The protective side cover (8) has a U-shaped cross section. The flaw detector body (1) is wrapped in the two protective side covers (8). The fixed frame (2) and the flaw detector body (1) are detachably connected. The fixed frame (2) is provided with end protection mechanisms at the top and bottom. The end protection mechanism includes a protective end cap (12), the protective end cap (12) has an L-shaped cross section, the top and bottom of the fixed frame (2) are provided with movable grooves (9), the movable grooves (9) are slidably connected with movable blocks (10), the top of the movable blocks (10) is fixedly connected with a support rod (11), the protective end cap (12) is fixedly connected to the top of the support rod (11), the bottom of the protective end cap (12) is provided with two symmetrically distributed locking rods (15), the locking rods (15) and the protective end cap (12) are an integral structure, the top and bottom of the protective side cover (8) are provided with slots (13), the side of the slot (13) and the locking rod (15) that contact each other is a slope, the top of the slope of the slot (13) is provided with an arc-shaped locking head (14), and the position where the locking rod (15) and the locking head (14) contact each other is provided with a matching groove.

2. The handheld ultrasonic flaw detector according to claim 1, characterized in that, The flaw detector body (1) has a threaded groove (16) at its rear end, and the mounting bracket (2) has a threaded hole (17) at its rear end. The mounting bracket (2) has a mounting plate (18) at its rear end, and the mounting plate (18) has a first screw (19) threadedly connected to its rear end. The first screw (19) and the threaded groove (16) work together to fix the mounting plate (18) and the mounting bracket (2) onto the flaw detector body (1).

3. A handheld ultrasonic flaw detector according to claim 2, characterized in that, The fixed plate (18) has two symmetrically distributed sliding sleeves (20) fixedly connected to its rear end. The top of the sliding sleeve (20) is provided with a directional groove (21). The cross section of the directional groove (21) is "convex". A directional block (22) is slidably connected in the directional groove (21). The same hand strap (23) is fixedly connected between the two directional blocks (22).

4. A handheld ultrasonic flaw detector according to claim 3, characterized in that, A fixing block (24) is provided in the directional groove (21). A second screw (25) is threaded to the rear end of the fixing block (24). The second screw (25) fixes the fixing block (24) in the directional groove (21).

5. A handheld ultrasonic flaw detector according to claim 1, characterized in that, The two protective side covers (8) are fixedly connected to the opposite sides of the first airbag (26), and the two protective end covers (12) are fixedly connected to the opposite sides of the second airbag (33). The first airbag (26) and the second airbag (33) are both connected to an inflation mechanism.

6. A handheld ultrasonic flaw detector according to claim 5, characterized in that, The inflation mechanism includes two inflation boxes (28), which are located between two protective side covers (8). A fixing rod (27) is fixedly connected to one side of the inflation box (28), and the fixing rod (27) is fixedly connected to the adjacent protective side cover (8). A push plate (29) is provided inside the inflation box (28). A push rod (30) is fixedly connected to the side of the push plate (29) away from the fixing rod (27). The other side of the push rod (30) passes through the inflation box (28) and is fixedly connected to the adjacent protective side cover (8). A first hose (31) and a second hose (32) are connected to the side of the inflation box (28) away from the push plate (29). The other ends of the first hose (31) and the second hose (32) are respectively connected to the adjacent second airbag (33) and the first airbag (26).

7. A handheld ultrasonic flaw detector according to claim 1, characterized in that, The inner wall of the front end of the protective side cover (8) is a slope, which slopes upward from the inside out.

8. A handheld ultrasonic flaw detector according to claim 7, characterized in that, The inclined surface of the protective side cover (8) is fixedly connected with dense anti-slip protrusions (34), and the cross-sectional profile of the anti-slip protrusions (34) is wavy.

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