An ultrasonic non-destructive testing device

Abstract

The application relates to the technical field of ultrasonic detection of steel pipes, and discloses an ultrasonic nondestructive testing device, which comprises a machine body, the inner cavity of the machine body is sequentially provided with a feeding mechanism, a detection assembly and a discharging assembly from left to right, the feeding mechanism is used for lifting, translating, clamping and rotating the pipe fitting and comprises a lifting assembly, a translation assembly, a clamping assembly and a rotating assembly. The bidirectional clamping screw is driven to rotate by the clamping motor, the rotating shaft seat is driven to move close to each other by the T-shaped block, the chuck extrudes the pipe fitting, the pipe fitting is fixed, the chuck is driven to rotate by the rotating motor, the pipe fitting is driven to rotate by the friction force between the chuck and the pipe fitting, the pipe fitting is finally driven to move to the probe, the pipe fitting is in contact with the probe, the probe detects the scratch of the pipe fitting, the pipe fitting is rotated and translated, the probe comprehensively scans the surface of the pipe fitting, and the accuracy and comprehensiveness of the scratch detection of the pipe fitting are improved.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic testing technology for steel pipes, specifically to an ultrasonic non-destructive testing device. Background Technology

[0002] Ultrasonic testing is a method of inspecting defects in parts by utilizing the ability of ultrasonic waves to penetrate deep into metallic materials and to reflect off the interfaces when they travel from one cross-section to another. When an ultrasonic beam propagates from the probe through the surface of a part into the metal, it is reflected when it encounters defects or the bottom surface of the part, forming pulse waveforms on a fluorescent screen. The location and size of the defects are determined based on these pulse waveforms.

[0003] Currently, when inspecting pipe fittings, the surface of the fittings is curved. The current inspection mainly involves straight-line detection along the surface of the fittings, which is not comprehensive and has blind spots. Furthermore, if there are problems with the pipe fittings after inspection, the problematic fittings cannot be distinguished from the normal fittings in a timely manner, which leads to the need for additional screening processes and low efficiency.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides an ultrasonic non-destructive testing device that has the advantages of comprehensive scanning flaw detection and intelligent screening and collection. It solves the problems of incomplete detection of pipe surfaces, blind spots, and the inability to distinguish between problematic and normal pipes in a timely manner, which leads to the need for additional screening processes and low efficiency.

[0007] (II) Technical Solution

[0008] To address the aforementioned technical problems of incomplete surface detection of pipe fittings, resulting in blind spots and the inability to promptly distinguish between problematic and normal pipe fittings, leading to subsequent screening processes and low efficiency, this invention provides the following technical solution:

[0009] An ultrasonic non-destructive testing device includes a body, wherein a feeding mechanism, a testing component, and a discharging component are sequentially installed from left to right in the inner cavity of the body.

[0010] The feeding mechanism is used for lifting, translating, clamping and rotating the pipe fitting, and includes a lifting assembly, a translating assembly, a clamping assembly and a rotating assembly;

[0011] A detection component for detecting pipe damage includes an ultrasonic detector, a probe, and a marking component. The ultrasonic detector uses the probe to detect whether there are any damages at the locations traversed by the probe, and the marking component is used to mark the areas where the damages are located.

[0012] The feeding assembly is used to collect pipe fittings with damage and pipe fittings without damage in separate areas.

[0013] Preferably, the detection assembly further includes a mounting base, on one side of the bottom inner wall of the mounting base the ultrasonic detector is fixedly mounted, and on the other side a liquid tank is fixedly mounted. The liquid tank is connected to a nozzle via a hose. The nozzle is located on one side of the upper surface of the mounting base. The ultrasonic detector is connected to the probe, and the probe is located in the middle of the upper surface of the mounting base.

[0014] Preferably, the translation component includes a translation screw, which passes through and is rotatably connected to one side of the machine body, and is fixedly connected to the rotating shaft of a translation motor. The translation motor is fixedly installed on the upper part of one side of the machine body. The translation screw passes through and is threadedly connected to a threaded block, and a mounting bracket is fixedly installed on the lower surface of the threaded block.

[0015] The upper surface of the threaded block is fixedly connected to a dovetail slider, the dovetail slider is slidably connected to a dovetail slide rail, and the dovetail slide rail is fixedly installed on the top of the inner wall of the machine body.

[0016] Preferably, the lifting assembly includes a lifting motor fixedly installed on the middle of one side of the upper surface of the mounting frame. The rotating shaft of the lifting motor passes through and is fixedly connected to a lifting screw. The lower end of the lifting screw is rotatably connected to a bearing seat, which is fixedly installed on the mounting frame. The lifting screw passes through and is threadedly connected to a lifting block, which is fixedly installed on the clamping assembly. Lifting guide blocks are fixedly installed at both ends of one side of the clamping assembly. The lifting guide blocks pass through and are slidably connected to a lifting guide rod, which is fixedly installed on the mounting frame.

[0017] Preferably, the clamping assembly includes a clamping base, and the lifting block and the lifting guide block are fixedly installed on one side of the clamping base;

[0018] The inner wall of the clamping base is slidably connected to a T-shaped block. The lower surface of the T-shaped block is fixedly installed with the rotating component through a connector. The T-shaped block is threaded through and connected with a bidirectional clamping screw. The bidirectional clamping screw is rotatably connected to the clamping base. One end of the bidirectional clamping screw is fixedly installed with the rotating shaft of the clamping motor. The clamping motor is fixedly installed on one side of the clamping base.

[0019] Preferably, the rotating assembly includes two rotating seats, which are fixedly mounted on the lower surface of the connector. A chuck is rotatably connected to the inner side of the rotating seat, and a rotary motor is fixedly mounted on one side of one of the chucks. The rotary motor is fixedly mounted on one side of the rotating seat.

[0020] Preferably, the unloading assembly includes an unloading frame, and both ends of the upper surface of the unloading frame are provided with bearing seats. The bearing seats are respectively connected to adjusting shaft one and adjusting shaft two through and rotatably. One end of adjusting shaft one and adjusting shaft two are respectively fixedly connected to driving motor one and driving motor two. Unloading guide plates are fixedly connected to adjusting shaft one and adjusting shaft two, and the unloading guide plates on the two are distributed crosswise.

[0021] Preferably, it also includes two placement racks, which are adjustablely installed on one side of the bottom inner wall of the machine body to suspend the pipe fittings.

[0022] Preferably, a connecting block is fixedly installed in the middle of the lower surface of the placement rack, the connecting block is slidably connected to the bottom of the inner wall of the machine body, the lower part of the connecting block is threadedly connected to a bidirectional adjusting screw, one end of the bidirectional adjusting screw is rotatably connected to the machine body, and one end of the bidirectional adjusting screw is fixedly connected to an adjusting knob.

[0023] (III) Beneficial Effects

[0024] Compared with the prior art, the present invention provides an ultrasonic non-destructive testing device, which has the following beneficial effects:

[0025] 1. This invention uses a clamping motor to drive a bidirectional clamping screw to rotate, which in turn causes the T-shaped block to bring the rotating shaft closer together, allowing the chuck to press against the pipe and fix it in place. Then, the rotary motor drives the chuck to rotate, and the friction between the chuck and the pipe causes the pipe to rotate, finally moving the pipe towards the probe until it comes into contact with the probe, allowing the probe to detect scratches on the pipe. Thus, through the rotation and translation of the pipe, the probe can perform a comprehensive scan of the pipe surface, improving the accuracy and comprehensiveness of pipe scratch detection.

[0026] 2. In this invention, when a pipe passes through the probe, the ultrasonic testing instrument emits ultrasonic waves through the probe. Utilizing the penetrating power of ultrasonic waves, the instrument scans the pipe and determines whether there are any scratches based on the waveform of the received reflected waves. If scratches are found, the feeding mechanism stops operating, and simultaneously, the nozzle sprays out the marking liquid from the tank, applying the marking liquid to the cross-section where the pipe is damaged. This facilitates subsequent processing and allows workers to quickly locate the scratches, making it simple and effective.

[0027] 3. If the pipe fittings are damaged after inspection, the first motor drives the first adjusting shaft to rotate, thereby raising the feeding guide plate on the first adjusting shaft. After the pipe fittings are released from the chuck, they are fed through the feeding guide plate on the first adjusting shaft. Conversely, if they are not damaged, they are fed through the feeding guide plate on the second adjusting shaft. This separates the defective pipe fittings from the normal pipe fittings, avoiding the mixing of normal and defective pipe fittings and the need for subsequent screening, saving screening time and improving efficiency. Attached Figure Description

[0028] Figure 1 This is one of the three-dimensional structural diagrams of the present invention;

[0029] Figure 2 This is the second three-dimensional structural diagram of the present invention;

[0030] Figure 3 This is an exploded view of the present invention;

[0031] Figure 4 This is the feeding mechanism of the present invention;

[0032] Figure 5 This is an exploded view of the feeding mechanism of the present invention;

[0033] Figure 6 This is a structural diagram of the feeding assembly of the present invention;

[0034] Figure 7 This is a diagram showing the movement structure of the placement rack of the present invention;

[0035] Figure 8 This is a structural diagram of the detection component of the present invention;

[0036] Figure 9 This is a structural diagram of the clamping base of the present invention.

[0037] In the diagram: 1. Machine body; 2. Ultrasonic testing instrument; 3. Probe; 4. Mounting base; 5. Liquid tank; 6. Nozzle; 7. Translation motor; 8. Threaded block; 9. Mounting bracket; 10. Dovetail slider; 11. Dovetail slide rail; 12. Lifting motor; 13. Lifting screw; 14. Bearing seat; 15. Lifting block; 16. Lifting guide block; 17. Lifting guide rod; 18. Clamping base; 19. T-block; 20. Connecting piece; 21. Bidirectional clamping screw; 22. Clamping motor; 23. Rotary seat; 24. Chuck; 25. Rotary motor; 26. Unloading rack; 27. Shaft seat; 28. Adjusting shaft one; 29. ​​Adjusting shaft two; 30. Drive motor one; 31. Drive motor two; 32. Unloading guide plate; 33. Placement rack; 34. Connecting block; 35. Bidirectional adjusting screw; 36. Adjusting knob; 37. Translation screw. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes an ultrasonic non-destructive testing device.

[0040] Please see Figure 1-9 An ultrasonic non-destructive testing device includes a body 1, wherein a feeding mechanism, a testing component, and a discharging component are sequentially installed in the inner cavity of the body 1 from left to right;

[0041] The feeding mechanism is used for lifting, translating, clamping and rotating the pipe fitting, and includes a lifting assembly, a translating assembly, a clamping assembly and a rotating assembly;

[0042] The detection component is used for detecting damage to pipe fittings, including an ultrasonic detector 2, a probe 3, and a marking component. The ultrasonic detector 2 detects whether there are any damages at the locations traversed by the probe 3 through the probe 3, and the marking component is used to mark the areas where the damages are located.

[0043] The feeding assembly is used to collect pipe fittings with damage and pipe fittings without damage in separate areas.

[0044] Furthermore, the detection assembly also includes a mounting base 4, on one side of the bottom inner wall of the mounting base 4, the ultrasonic detector 2 is fixedly installed, and on the other side, a liquid tank 5 is fixedly installed. The liquid tank 5 is connected to a nozzle 6 via a hose. The nozzle 6 is located on one side of the upper surface of the mounting base 4. The ultrasonic detector 2 is connected to the probe 3, and the probe 3 is located in the middle of the upper surface of the mounting base 4.

[0045] The marking components consist of a liquid tank 5 and a nozzle 6. When the feeding mechanism passes the pipe fitting through the probe 3, the ultrasonic detector emits ultrasonic waves through the probe. Utilizing the penetrating power of ultrasonic waves, the detector scans the pipe fitting and determines whether there are any scratches based on the waveform of the received reflected waves. If scratches are found, the feeding mechanism stops operating, and the nozzle 6 sprays the marking liquid from the liquid tank 5 onto the damaged section of the pipe fitting. This facilitates subsequent processing and allows workers to quickly locate the scratches, making the process simple and effective.

[0046] Furthermore, the translation component includes a translation screw 37, which passes through and is rotatably connected to one side of the machine body 1, and is fixedly connected to the rotating shaft of the translation motor 7. The translation motor 7 is fixedly installed on the upper part of one side of the machine body 1. The translation screw 37 passes through and is threadedly connected to a threaded block 8, and a mounting bracket 9 is fixedly installed on the lower surface of the threaded block 8.

[0047] The upper surface of the threaded block 8 is fixedly connected to a dovetail slider 10, and the dovetail slider 10 is slidably connected to a dovetail slide rail 11, which is fixedly installed on the top of the inner wall of the machine body 1.

[0048] The lifting assembly includes a lifting motor 12 fixedly installed on the middle of one side of the upper surface of the mounting frame 9. The rotating shaft of the lifting motor 12 passes through and is fixedly connected to a lifting screw 13. The lower end of the lifting screw 13 is rotatably connected to a bearing seat 14. The bearing seat 14 is fixedly installed on the mounting frame 9. The lifting screw 13 passes through and is threadedly connected to a lifting block 15. The lifting block 15 is fixedly installed on the clamping assembly. Lifting guide blocks 16 are fixedly installed at both ends of one side of the clamping assembly. The lifting guide block 16 passes through and is slidably connected to a lifting guide rod 17. The lifting guide rod 17 is fixedly installed on the mounting frame 9.

[0049] The clamping assembly includes a clamping base 18, and the lifting block 15 and the lifting guide block 16 are fixedly installed on one side of the clamping base 18.

[0050] A T-shaped block 19 is slidably connected to the inner wall of the clamping base 18. The rotating component is fixedly installed on the lower surface of the T-shaped block 19 through a connector 20. A bidirectional clamping screw 21 is threaded through and connected to the T-shaped block 19. The bidirectional clamping screw 21 is rotatably connected to the clamping base 18. The rotating shaft of the clamping motor 22 is fixedly installed at one end of the bidirectional clamping screw 21. The clamping motor 22 is fixedly installed on one side of the clamping base 18.

[0051] The rotating assembly includes two rotating seats 23, which are fixedly installed on the lower surface of the connector 20. A chuck 24 is rotatably connected to the inner side of the rotating seat 23. A rotary motor 25 is fixedly installed on one side of one of the chucks 24, and the rotary motor 25 is fixedly installed on one side of the rotating seat 23.

[0052] The pipe fitting is then conveyed to the placement rack via the feeding system. The lifting motor 12 drives the lifting screw 13 to rotate under the action of the bearing seat 14. The lifting screw 13 meshes with the lifting block 15, causing the lifting block 15 to drive the clamping base 18 to move downward under the action of the lifting guide rod 17 and the lifting guide block 16, making the chuck 24 coaxial with the pipe fitting. Then, the clamping motor 22 is started, causing the bidirectional clamping screw 21 to rotate. This causes the rotating shaft seat to move closer together via the T-shaped block 19, allowing the chuck 24 to squeeze the pipe fitting and fix it. Then, the rotating motor 25 drives the chuck 24 to rotate, and the friction between the chuck 24 and the pipe fitting causes the pipe fitting to rotate. Finally, the pipe fitting moves towards the probe, making contact with the probe, allowing the probe to detect scratches on the pipe fitting. Through the rotation and translation of the pipe fitting, the probe can perform a comprehensive scan of the pipe fitting surface, improving the accuracy and comprehensiveness of the pipe fitting scratch detection.

[0053] The feeding system is an external device that uses conveyor rollers for fixed-point feeding, which is existing technology.

[0054] A rubber layer is installed on the inside of the chuck, which increases the friction between the pipe fitting and the chuck, and at the same time prevents the chuck from damaging the pipe fitting during clamping.

[0055] Furthermore, the unloading assembly includes an unloading frame 26, with bearing seats 27 at both ends of the upper surface of the unloading frame 26. An adjusting shaft 28 and an adjusting shaft 29 are respectively connected through and rotatably to the bearing seats 27. A drive motor 30 and a drive motor 31 are respectively fixedly connected to one end of the adjusting shaft 28 and the adjusting shaft 29. Unloading guide plates 32 are fixedly connected to both the adjusting shaft 28 and the adjusting shaft 29, and the unloading guide plates 32 on both are distributed crosswise.

[0056] Therefore, after the inspection is completed, if the pipe is damaged, the drive motor 30 will drive the adjusting shaft 28 to rotate, thereby raising the unloading guide plate 32 on the adjusting shaft 28. After the pipe is released from the chuck, it will be unloaded through the unloading guide plate 32 on the adjusting shaft 28. Conversely, if the pipe is damaged, it will be unloaded through the unloading guide plate 32 on the adjusting shaft 29. This separates the defective pipe from the normal pipe, avoiding the mixing of normal pipe and defective pipe, which would require subsequent screening. This saves screening time and improves efficiency.

[0057] Furthermore, it also includes two placement racks 33, which are adjustablely installed on one side of the bottom inner wall of the body 1 to suspend the pipe fittings.

[0058] A connecting block 34 is fixedly installed in the middle of the lower surface of the placement rack 33. The connecting block 34 passes through and slides to the bottom of the inner wall of the machine body 1. A bidirectional adjusting screw 35 is threaded through and threaded to the lower part of the connecting block 34. One end of the bidirectional adjusting screw 35 passes through and rotates to be connected to the machine body 1. An adjusting knob 36 is fixedly connected to one end of the bidirectional adjusting screw 35.

[0059] The pipe fittings are suspended by the placement rack 33, which facilitates the clamping of the pipe fittings by the chuck. By rotating the adjustment knob 36, the bidirectional adjustment screw 35 is rotated, which causes the connecting blocks 34 to move closer to each other, reducing the distance between the placement racks 33. This makes the distance between the placement racks 33 adjustable, which can meet the placement of pipe fittings of different lengths.

[0060] Working principle: When in use, the pipe fitting is placed on the placement rack, which suspends the pipe fitting in the air, making it easier for the chuck to clamp the pipe fitting.

[0061] Then, the lifting motor drives the lifting screw to rotate under the action of the bearing seat. Through the engagement of the lifting screw and the lifting block, the lifting block drives the clamping base to move downward under the action of the lifting guide rod and the lifting guide block, so that the chuck and the pipe are coaxial. Then, the clamping motor is started, which drives the bidirectional clamping screw to rotate. This causes the rotating shaft seat to move closer together through the T-block, so that the chuck squeezes the pipe and fixes it. Then, the rotary motor drives the chuck to rotate, and the friction between the chuck and the pipe causes the pipe to rotate. Finally, the pipe moves towards the probe, so that the pipe contacts the probe and the probe performs scratch detection on the pipe. Through the rotation and translation of the pipe, the probe can perform a comprehensive scan of the pipe surface, which improves the accuracy and comprehensiveness of the pipe scratch detection.

[0062] When the pipe passes through the probe, the ultrasonic testing instrument emits ultrasonic waves through the probe. The ultrasonic waves are used to scan the metal by penetrating power. The waveform of the received reflected wave is used to determine whether there are any scratches. If scratches are found, the feeding mechanism stops and the nozzle sprays the marking liquid in the tank onto the damaged section of the pipe. This facilitates subsequent processing and allows workers to quickly locate the scratches. It is simple and effective.

[0063] If a pipe fitting is found to be damaged after inspection, motor one drives adjusting shaft one to rotate, thereby raising the feeding guide plate on adjusting shaft one. After the pipe fitting is released from the chuck, it is fed through the feeding guide plate on adjusting shaft one. Conversely, if the pipe fitting is damaged, it is fed through the feeding guide plate on adjusting shaft two. This process separates defective pipe fittings from normal pipe fittings, preventing the mixing of normal and defective pipe fittings and avoiding subsequent screening. This saves screening time and improves efficiency.

[0064] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ultrasonic non-destructive testing device comprising a machine body (1), characterised in that: The inner cavity of the machine body (1) is sequentially provided with a feeding mechanism, a detection assembly and a discharging assembly from left to right; The feeding mechanism is used for lifting, translating, clamping and rotating the pipe, and comprises a lifting assembly, a translation assembly, a clamping assembly and a rotating assembly; The detection assembly is used for detecting the scratch of the pipe, and comprises an ultrasonic detector (2), a probe (3) and a marking assembly, the ultrasonic detector (2) detects whether there is scratch at the position passed by the probe (3) through the probe (3), and the marking assembly is used for marking the area where the scratch is located; The discharging assembly is used for collecting the pipe with scratch and the pipe without scratch in different areas; The detection assembly further comprises a mounting seat (4), the inner wall bottom of the mounting seat (4) is fixedly provided with the ultrasonic detector (2) on one side and a liquid tank (5) on the other side, the liquid tank (5) is connected with a spray head (6) through a hose, the spray head (6) is located on one side of the upper surface of the mounting seat (4), the ultrasonic detector (2) is connected with the probe (3), and the probe (3) is located in the middle of the upper surface of the mounting seat (4); The translation assembly comprises a translation screw (37), the translation screw (37) penetrates and is rotationally connected to one side of the machine body (1), and the rotation shaft of a translation motor (7) is fixedly connected to the translation screw (37), the translation motor (7) is fixedly installed on the upper side of the machine body (1), the translation screw (37) penetrates and is screw-connected with a screw block (8), and the lower surface of the screw block (8) is fixedly provided with a mounting frame (9); The upper surface of the screw block (8) is fixedly connected with a dovetail sliding block (10), the dovetail sliding block (10) is slidingly connected with a dovetail sliding rail (11), and the dovetail sliding rail (11) is fixedly installed on the inner wall top of the machine body (1); The lifting assembly comprises a lifting motor (12) fixedly installed on one side of the middle of the upper surface of the mounting frame (9), the rotation shaft of the lifting motor (12) penetrates and is fixedly connected with a lifting screw (13), the lower end of the lifting screw (13) is rotationally connected with a bearing seat (14), the bearing seat (14) is fixedly installed on the mounting frame (9), the lifting screw (13) penetrates and is screw-connected with a lifting block (15), and the lifting block (15) is fixedly installed on the clamping assembly, the clamping assembly is fixedly provided with lifting guide blocks (16) at both ends of one side, the lifting guide blocks (16) penetrate and are slidingly connected with lifting guide rods (17), and the lifting guide rods (17) are fixedly installed on the mounting frame (9); The rotating assembly comprises two rotating seats (23), the rotating seats (23) are fixedly installed on the lower surface of the connecting piece (20), the inner side of the rotating seat (23) is rotationally connected with a chuck (24), one side of one of the chucks (24) is fixedly provided with a rotating motor (25), and the rotating motor (25) is fixedly installed on one side of the rotating seat (23); The blanking assembly comprises a blanking frame (26), two ends of the upper surface of the blanking frame (26) are provided with shaft seats (27), the shaft seats (27) are respectively penetrated and rotationally connected with adjusting shafts one (28) and two (29), one end of the adjusting shafts one (28) and two (29) are respectively fixedly connected with driving motors one (30) and two (31), the adjusting shafts one (28) and two (29) are all fixedly connected with blanking guide plates (32), and the blanking guide plates (32) on the two are cross-distributed.

2. An ultrasonic non-destructive testing device according to claim 1, wherein: The clamping assembly comprises a clamping base (18), one side of the clamping base (18) is fixedly installed with the lifting block (15) and the lifting guide block (16); The inner wall of the clamping base (18) is slidably connected with a T-shaped block (19), the lower surface of the T-shaped block (19) is fixedly installed with the rotating assembly through a connecting piece (20), the T-shaped block (19) is penetrated and threadedly connected with a bidirectional clamping screw (21), the bidirectional clamping screw (21) is penetrated and rotationally connected with the clamping base (18), one end of the bidirectional clamping screw (21) is fixedly installed with the rotating shaft of a clamping motor (22), and the clamping motor (22) is fixedly installed on one side of the clamping base (18).

3. An ultrasonic non-destructive testing apparatus according to claim 2, wherein: Two placing frames (33) are further arranged, the placing frames (33) are adjustably installed on one side of the bottom of the inner wall of the machine body (1), and the pipe is placed in the air.

4. An ultrasonic non-destructive testing apparatus according to claim 3, wherein: The lower surface of the placing frame (33) is fixedly installed with a connecting block (34) in the middle, the connecting block (34) is penetrated and slidably connected with the bottom of the inner wall of the machine body (1), the lower part of the connecting block (34) is penetrated and threadedly connected with a bidirectional distance adjusting screw (35), one end of the bidirectional distance adjusting screw (35) is penetrated and rotationally connected with the machine body (1), and one end of the bidirectional distance adjusting screw (35) is fixedly connected with a distance adjusting knob (36).

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