A device and method for detecting non-metallic inclusions in powder metallurgy tool steel

Abstract

The invention discloses a detection device and method for non-metallic inclusions in powder metallurgy tool steel, and relates to the field of powder metallurgy tool steel detection. The device and method comprise a protective shell and a sealing cover plate, wherein both sides of the top of the sealing cover plate are provided with fixing structures for connecting the sealing cover plate with the protective shell; an ultrasonic detection component, wherein the ultrasonic detection component comprises an ultrasonic flaw detector and a detection probe, wherein the outer side of the detection probe is provided with a hand-held collar; when a coupling agent needs to be added, the device and method only need to place the thumb and middle finger on both sides of the hand-held collar to take it, and then press the extrusion plate downward with the index finger to add the coupling agent to the surface of the powder metallurgy tool steel, and then evenly apply it with a coating pad, and then detect the powder metallurgy tool steel with the detection probe, so that there is no need to take an external coupling agent bottle and a tool brush back and forth, which can greatly shorten the time for adding and applying the coupling agent and improve the detection efficiency of the powder metallurgy tool steel.

Description

Technical Field

[0001] The present invention relates to the technical field related to powder metallurgy tool steel detection, and in particular to a device and method for detecting non-metallic inclusions in powder metallurgy tool steel. Background Art

[0002] Tool steel is the most important component of the mold and the most widely used material in the mold. It is an important material carrier and technical foundation of the mold manufacturing industry. Its variety, specification and quality play a decisive role in the performance, service life and manufacturing cycle of the mold. Powder metallurgy mold steel, as the name suggests, refers to steel used to manufacture molds prepared by powder metallurgy process. Compared with the traditional melt metallurgy method, its preparation process is simpler, the production efficiency is higher, and the material uniformity and density are better.

[0003] The existing non-metallic inclusion detection methods for powder metallurgy tool steel mainly include metallographic inspection, scanning electron microscope (SEM) combined with energy spectrum analysis (EDS), and ultrasonic detection. The principle of ultrasonic detection is that when ultrasonic waves propagate in the material, they will reflect, refract, and scatter when encountering the interface of different media (such as the interface between inclusions and the matrix). By detecting these changes in ultrasonic waves, it is possible to determine whether there are inclusions inside the material and the approximate location and size range of the inclusions.

[0004] Coupling agent is required for ultrasonic testing. Coupling agent is applied between the probe and the sample surface to ensure that ultrasonic waves can be effectively transmitted to the sample. The existing method of applying coupling agent requires the staff to squeeze the external coupling agent to the powder metallurgy tool steel detection position first, and then evenly apply the coupling agent with a tool brush or fingers. After the application is completed, the coupling agent bottle and the tool brush are placed aside and the detection probe is taken for detection. The coupling agent is separated from the detection device, which is inconvenient to operate and affects the detection efficiency. Summary of the invention

[0005] In order to solve the defects in the prior art, the present invention provides a device and method for detecting non-metallic inclusions in powder metallurgy tool steel.

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

[0007] The present invention discloses a device for detecting non-metallic inclusions in powder metallurgy tool steel, comprising:

[0008] A protective shell and a sealing cover plate which is arranged on the front of the protective shell and is used to close the protective shell by rotating through hinges;

[0009] An ultrasonic detection assembly for detecting non-metallic inclusions, the ultrasonic detection assembly comprising an ultrasonic flaw detector and a detection probe electrically connected to the ultrasonic flaw detector through a wire, the outer side of the detection probe is provided with a hand-held ring that is in a ring shape and convenient for hand-holding;

[0010] A coupling agent smearing assembly is provided at the front end of the hand-held collar, and the coupling agent smearing assembly includes an extrusion plate and an smearing pad that can move up and down. The coupling agent smearing assembly quickly extrude the coupling agent onto the surface of the powder metallurgy tool steel to be tested through the extrusion of the extrusion plate and evenly smears it through the smearing pad;

[0011] An annular mounting groove is provided inside the hand-held ring, and an abutment clamping component for clamping the position of the detection probe is arranged in the mounting groove.

[0012] As a preferred technical solution of the present invention, the coupling agent application component also includes:

[0013] A liquid storage box for storing coupling agent, wherein the liquid storage box is fixedly arranged at the front end of the hand-held ring and a plate-shaped piston is slidably and sealedly arranged in the liquid storage box, a sealing cone column with an inverted cone bottom is fixedly arranged on one side of the bottom end of the piston, and a liquid outlet hole is opened through the bottom end of the liquid storage box corresponding to the sealing cone column;

[0014] The liquid storage bottle is used to supply the liquid storage box and the bottom of the liquid storage bottle is threadedly connected with a connecting pipe, one end of the connecting pipe is connected to the interior of the liquid storage box and a one-way valve is arranged at the pipe mouth.

[0015] As a preferred technical solution of the present invention, the squeezing plate is in an inverted U shape, and the bottom of the squeezing plate sequentially slides through the top and bottom of the liquid storage box and is fixedly connected to the piston, and when the squeezing plate is not squeezed, its bottom position is higher than the bottom position of the detection probe;

[0016] A support spring is fixedly arranged at the bottom end of the top of the squeezing plate to facilitate its reset position after squeezing, and the bottom end of the support spring is fixedly connected to the hand-held ring;

[0017] The corners at the bottom of the extrusion plate are arranged in an arc shape, and the smear pad is attached to its outer surface through a Velcro piece arranged on the outer wall of the extrusion plate and is L-shaped, and an easy-tear opening for convenient tearing of the smear pad is opened at the edge of the bottom of the extrusion plate.

[0018] As a preferred technical solution of the present invention, both sides of the extrusion plate at the top of the hand-held ring are provided with limited notches, and a locking mechanism for limiting and locking the position of the extrusion plate is provided in the limited notches;

[0019] The locking mechanism comprises:

[0020] A fixed sleeve, fixedly arranged on the back side of the extrusion plate, and a hollow rotating cylinder is arranged inside the fixed sleeve, and the rotating cylinder is rotatably connected to the fixed sleeve through bearing seats arranged outside at both ends, and a shifting block is rotatably arranged in the middle of the fixed sleeve, and the shifting block is fixedly arranged in the middle of the rotating cylinder;

[0021] Two fixing nuts are respectively fixedly arranged at two ends of the rotating drum, and the two fixing nuts are respectively threadedly connected with movable studs;

[0022] One end of the movable stud is slidably arranged in the rotating cylinder, and the other end of the movable stud is fixedly provided with an L-shaped limiting cross bar corresponding to the limiting notch. A limiting slide is fixedly arranged at one end of the limiting cross bar located inside the rotating cylinder, and the limiting slide cooperates with the limiting sliding arrangement in a limiting slide groove opened on the inner wall of the fixed sleeve.

[0023] As a preferred technical solution of the present invention, the abutment clamping assembly comprises:

[0024] The annular rotating ring is suspended in the mounting ring groove and the outer side wall of the rotating ring is provided with a limiting ring groove, and at least three limiting rollers are provided in the limiting ring groove for limiting and rolling.

[0025] As a preferred technical solution of the present invention, a toothed ring is arranged in the limiting ring groove between two adjacent limiting rollers, a driving gear is meshed with one side of the toothed ring, and a screwing block is fixedly arranged at the axis of the driving gear through a handheld sleeve ring.

[0026] As a preferred technical solution of the present invention, at least six abutment blocks are fixedly arranged at equal intervals on the inner side wall of the rotating ring along the circumferential direction, and one end of the abutment block passes through the slot provided on the inner side wall of the hand-held sleeve ring to abut against the detection probe;

[0027] The end surface of the abutment block in contact with the detection probe is provided with an elastic compression pad.

[0028] As a preferred technical solution of the present invention, both sides of the top of the sealing cover plate are provided with fixing structures for connecting the sealing cover plate with the protective housing, and when the sealing cover plate is placed horizontally, it can be used as a detection workbench and its position is supported and placed by two fixing structures;

[0029] The fixing structure comprises a foot having an anti-slip pattern on the outside, a supporting stud is fixedly arranged on the inner side of the foot, and one end of the supporting stud is threaded through the sealing cover plate and fixedly connected to the connecting stud;

[0030] A fixed crossbeam is arranged inside the protective shell at the top of the ultrasonic flaw detector corresponding to the two connecting studs, and screw holes matching the connecting studs are opened on the fixed crossbeam.

[0031] As a preferred technical solution of the present invention, the sealing cover plate is used as a workbench and a detection groove for placing powder metallurgy tool steel is opened in the middle of one side, and a card slot for inserting the detection probe is opened on one side of the detection groove, and when the sealing cover plate is closed, the detection probe, the handheld ring and the coupling agent application assembly can be placed in the placement chamber formed between the ultrasonic flaw detector and the two fixed beams.

[0032] The present invention also provides a method for detecting non-metallic inclusions in powder metallurgy tool steel, comprising the following steps:

[0033] S1: First, open the sealing cover plate and support it horizontally by using the feet and support studs to use it as a testing workbench, and then place the powder metallurgy tool steel to be tested in the testing tank;

[0034] S2: Apply coupling agent to the surface of powder metallurgy tool steel, press the extrusion plate downward with the index finger, when the extrusion plate is forced to drive the piston downward, the coupling agent in the liquid storage box will be squeezed out through the liquid outlet hole to the surface of the powder metallurgy tool steel, when the piston continues to move downward until the sealing cone column is pushed into the liquid outlet hole, the liquid outlet hole will stop discharging liquid, and then evenly apply the coupling agent with the application pad;

[0035] S3: Place the detection probe on the surface of powder metallurgy tool steel and use linear scanning to fully scan the sample. When the ultrasonic wave encounters inclusions, the ultrasonic flaw detector will display a reflected wave signal. Based on the intensity, position and time information of the reflected wave, the position and size of the non-metallic inclusions can be determined.

[0036] The beneficial effects of the present invention are:

[0037] 1. For the detection device of non-metallic inclusions of powder metallurgy tool steel, when coupling agent needs to be added, the thumb and middle finger are placed on both sides of the hand-held ring to take it, and then the extrusion plate is pressed downward by the index finger to add coupling agent to the surface of the powder metallurgy tool steel, and then it is evenly applied by the application pad. After the application is completed, the extrusion plate is removed by the index finger, and then the powder metallurgy tool steel is tested by the detection probe. In this way, there is no need to take the external coupling agent bottle and tool brush back and forth, the operation is more convenient, the time for adding and applying coupling agent can be shortened, and the detection efficiency of powder metallurgy tool steel is improved.

[0038] 2. This device for detecting non-metallic inclusions in powder metallurgy tool steel facilitates the bonding of the smear pad and the extrusion plate by means of the Velcro patch, and the easy-tear opening makes it more convenient to replace the smear pad. The smear pad and the extrusion plate are bonded in an L-shape with an outer bottom angle in an arc shape, so that the outer bottom angle of the smear pad facilitates smearing on some edges.

[0039] 3. This device for detecting non-metallic inclusions in powder metallurgy tool steel can limit and lock the position of the extrusion plate in the vertical direction through the cooperation of the locking mechanism and the two limit notches when there is no need to detect the powder metallurgy tool steel. In this way, even if the extrusion plate is touched by external force, it will not move downward to squeeze out the coupling agent in the liquid storage box.

[0040] 4. For the detection device for non-metallic inclusions in powder metallurgy tool steel, when it is necessary to fix the position of the detection probe, the screw block can be turned to drive the rotating ring to rotate, and the rotation of the rotating ring will also drive multiple resistance blocks to rotate, and the resistance blocks rotate until they gradually fit and resist the detection probe. When the resistance blocks rotate to the point where they interfere with the side wall of the slot and cannot continue to rotate, the position of the detection probe can be tightly fixed by the cooperation of the elastic extrusion pad. When it is necessary to remove the fixation of the detection probe, the screw block can be turned in the opposite direction to rotate the resistance block to the other side of the slot, and the resistance block will remove the resistance to the detection probe, making it easy to disassemble and remove the detection probe.

[0041] 5. For the detection device of non-metallic inclusions of powder metallurgy tool steel, when the sealing cover plate is separated from the protective shell, the connecting studs can be loosened and separated from the screw holes, and the connecting studs can be moved to fit with the inner side of the sealing cover plate. At this time, the sealing cover plate can be horizontally supported by the pads, and the sealing cover plate can be used as a detection workbench. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0043] Figure 1 It is a schematic diagram of the structure of the sealing cover plate of the present invention when it is closed;

[0044] Figure 2 2. It is a schematic diagram of the structure of the sealing cover plate of the present invention when it is placed horizontally as a workbench;

[0045] Figure 3 It is a schematic diagram of the connection structure between the detection probe and the handheld ring of the present invention;

[0046] Figure 4 The present invention Figure 3 Side view of

[0047] Figure 5 The present invention Figure 3 Schematic diagram of the front structure;

[0048] Figure 6 The present invention Figure 5 A local enlarged view of point A;

[0049] Figure 7 It is a schematic diagram of the internal structure of the fixed sleeve of the present invention;

[0050] Figure 8 It is a schematic diagram of the connection structure between the interference clamping assembly and the hand-held collar of the present invention;

[0051] Fig. 9 It is a schematic diagram of the rotating ring structure of the present invention;

[0052] Fig.10 The present invention Figure 8 A partial enlarged view of point B;

[0053] Fig.11 It is a schematic diagram of the structure when the connecting stud of the present invention is connected to the fixed crossbeam;

[0054] Fig.12 The present invention Figure 4 Schematic diagram of the structure when the extrusion plate is pressed.

[0055] In the figure: 10, protective housing; 11, sealing cover; 12, foot pad; 13, support stud; 14, connecting stud; 15, fixed crossbeam; 16, slot; 20, ultrasonic detection assembly; 21, ultrasonic flaw detector; 22, detection probe; 30, hand-held ring; 31, mounting ring groove; 32, slot; 40, coupling agent application assembly; 41, extrusion plate; 42, application pad; 43, liquid storage box; 44, piston; 45, sealing cone column; 46, liquid outlet; 47, support Spring; 48, Velcro; 49, locking mechanism; 491, fixed sleeve; 492, rotating cylinder; 493, fixed nut; 494, moving stud; 495, limiting cross bar; 496, shift block; 410, easy tearing edge; 411, limiting notch; 412, liquid storage bottle; 50, abutting clamping assembly; 51, rotating ring; 52, limiting ring groove; 53, limiting roller; 54, toothed ring; 55, driving gear; 56, screwing block; 57, abutting block; 58, elastic extrusion pad. DETAILED DESCRIPTION

[0056] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0057] Embodiment 1

[0058] like Figure 1-Figure 4 , Figure 8 and Fig.12 As shown, the present invention is a detection device for non-metallic inclusions in powder metallurgy tool steel, comprising: a protective shell 10 and a sealing cover plate 11 which is rotatably arranged on the front of the protective shell 10 through a hinge and is used to seal the protective shell 10, both sides of the top of the sealing cover plate 11 are provided with fixed structures for connecting the sealing cover plate 11 with the protective shell 10, and when the sealing cover plate 11 is placed horizontally, it can be used as a detection workbench and its position is supported and placed by two fixed structures; an ultrasonic detection component 20, the ultrasonic detection component 20 includes an ultrasonic flaw detector 21 and a sealing cover plate 11 which is electrically connected to the ultrasonic flaw detector 21 through a wire. The detection probe 22 is provided with a hand-held ring 30 which is annular and easy to hold; a coupling agent smearing assembly 40 is provided at the front end of the hand-held ring 30, and the coupling agent smearing assembly 40 includes an extrusion plate 41 and an smearing pad 42 which can move up and down. The coupling agent smearing assembly 40 quickly extrude the coupling agent onto the surface of the powder metallurgy tool steel to be detected through the extrusion of the extrusion plate 41 and evenly smears it through the smearing pad 42; an annular mounting ring groove 31 is provided inside the hand-held ring 30, and an abutment clamping assembly 50 for clamping the position of the detection probe 22 is provided in the mounting ring groove 31.

[0059] It should be noted that, by setting the hand-held ring 30 and cooperating with the abutment clamping assembly 50, the detection probe 22 can be tightly fixed in the hand-held ring 30. When the coupling agent needs to be added, it is only necessary to place the thumb and middle finger on both sides of the hand-held ring 30 to pick it up, and then press the extrusion plate 41 downward with the index finger to add the coupling agent to the surface of the powder metallurgy tool steel, and then evenly apply it with the application pad 42. After the application is completed, remove the extrusion plate 41 with the index finger, and then use the detection probe 22 to detect the powder metallurgy tool steel. In this way, there is no need to take the external coupling agent bottle and tool brush back and forth, which can greatly shorten the time for adding and applying the coupling agent and improve the detection efficiency of the powder metallurgy tool steel.

[0060] Furthermore, if Figure 4-Figure 7 As shown, the coupling agent application assembly 40 also includes: a liquid storage box 43 for storing the coupling agent, the liquid storage box 43 is fixedly arranged at the front end of the hand-held ring 30 and a plate-shaped piston 44 is slidably and sealedly arranged in the liquid storage box 43, a sealing cone column 45 with an inverted cone bottom is fixedly arranged on one side of the bottom end of the piston 44, and a liquid outlet hole 46 is penetrated through the bottom end of the liquid storage box 43 corresponding to the sealing cone column 45; a liquid storage bottle 412, which is used to feed the liquid storage box 43 and the bottom of the liquid storage bottle 412 is threadedly connected with a connecting pipe, one end of the connecting pipe is connected to the interior of the liquid storage box 43 and a one-way valve is arranged at its pipe mouth.

[0061] In detail, by setting the liquid storage bottle 412, coupling agent can be added to the inside of the liquid storage box 43. The liquid storage bottle 412 can be made of flexible rubber material for easy extrusion. When the extrusion plate 41 is forced to drive the piston 44 to move downward, the coupling agent in the liquid storage box 43 will be squeezed outward through the liquid outlet 46 to the surface of the powder metallurgy tool steel. When the piston 44 continues to move downward until the sealing cone column 45 is pushed into the liquid outlet 46, the liquid outlet 46 will no longer discharge liquid, and then the coupling agent can be evenly applied through the application pad 42.

[0062] Furthermore, if Figure 4 , Figure 5 and Figure 6 As shown, the squeezing plate 41 is in an inverted U-shape, and the bottom of the squeezing plate 41 slides through the top and bottom of the liquid storage box 43 in sequence and is fixedly connected to the piston 44, and when the squeezing plate 41 is not squeezed, its bottom position is higher than the bottom position of the detection probe 22; a support spring 47 is fixedly provided at the bottom end of the top of the squeezing plate 41 to facilitate its reset position after squeezing, and the bottom end of the support spring 47 is fixedly connected to the hand-held ring 30; the corners of the bottom of the squeezing plate 41 are arranged in an arc shape, and the smear pad 42 is adhered to its outer surface through a Velcro piece 48 arranged on the outer wall of the squeezing plate 41 and is L-shaped, and an easy-tear opening 410 is provided at the edge of the bottom of the squeezing plate 41 to facilitate tearing off the smear pad 42.

[0063] Specifically, when the squeezing plate 41 is not squeezed, its bottom position is higher than the bottom position of the detection probe 22, so that the squeezing plate 41 and the smear pad 42 will not interfere with it when the detection probe 22 is used for detection, and the Velcro 48 is provided to facilitate the adhesion of the smear pad 42 to the squeezing plate 41, and the easy-tear opening 410 is provided to facilitate the replacement of the smear pad 42;

[0064] It should also be noted that by bonding the application pad 42 and the extrusion plate 41 in an L-shape with an arc-shaped outer bottom angle, it is convenient to apply the paint to some edges through the outer bottom angle of the application pad 42, and through the setting of the support spring 47, the position of the extrusion plate 41 can be supported, and when the pressure on the extrusion plate 41 is removed, the extrusion plate 41 can be restored to its original position.

[0065] Furthermore, if Figure 4 and Figure 5 As shown, the squeeze plate 41 is provided with limit notches 411 on both sides of the top of the hand-held ring 30 , and a locking mechanism 49 for limiting and locking the position of the squeeze plate 41 is provided in the limit notch 411 .

[0066] Among them, through the cooperation of the locking mechanism 49 and the two limit notches 411, when there is no need to inspect the powder metallurgy tool steel, the position of the extrusion plate 41 in the vertical direction can be limited and locked, so that even if the extrusion plate 41 is touched by external force, it will not move downward to squeeze out the coupling agent in the liquid storage box 43.

[0067] Furthermore, if Figure 7 As shown, the locking mechanism 49 includes: a fixed sleeve 491, which is fixedly arranged on the back side of the extrusion plate 41 and a rotating cylinder 492 with a hollow interior is arranged inside the fixed sleeve 491, the rotating cylinder 492 is rotatably connected to the fixed sleeve 491 through bearing seats arranged on the outside of both ends, and a shift block 496 is rotatably arranged in the middle of the fixed sleeve 491, and the shift block 496 is fixedly arranged in the middle of the rotating cylinder 492; two fixing nuts 493, which are respectively fixedly arranged at both ends of the rotating cylinder 492, and the two fixing nuts 493 are respectively threaded with movable studs 494; one end of the movable stud 494 is slidably arranged in the rotating cylinder 492, and the other end of the movable stud 494 is fixedly arranged with an L-shaped limiting cross bar 495 corresponding to the limiting notch 411, and one end of the limiting cross bar 495 located inside the rotating cylinder 492 is fixedly arranged with a limiting slide seat, and the limiting slide seat is matched with the limiting slide seat and is slidably arranged in a limiting groove opened on the inner wall of the fixed sleeve 491.

[0068] In detail, the shifting block 496 drives the rotating drum 492 and the fixing nut 493 to rotate. At this time, the two movable studs 494 threadedly connected to the fixing nut 493 will move relative to or towards each other along the fixed sleeve 491 under the cooperation and limitation of the limiting slide and the limiting groove. When the position of the extrusion plate 41 needs to be limited and locked, the shifting block 496 is shifted to allow the two limiting cross bars 495 to follow the movable studs 494 to move relative to each other until they are within the limiting notch 411, thereby locking the position of the extrusion plate 41 in the vertical direction. When the extrusion plate 41 needs to be unlocked, the shifting block 496 is shifted in the opposite direction to allow the two limiting cross bars 495 to move towards each other and separate from the limiting notch 411.

[0069] Embodiment 2

[0070] like Figure 8 and Fig. 9 As shown, the abutment clamping assembly 50 includes: an annular rotating ring 51, which is suspended in the mounting ring groove 31 and has an outer wall of the rotating ring 51 with a limiting ring groove 52, in which at least three limiting rollers 53 are provided for limiting and rolling; a toothed ring 54 is provided in the limiting ring groove 52 between two adjacent limiting rollers 53, and a driving gear 55 is meshed with one side of the toothed ring 54, and a screw block 56 is fixedly provided at the axis of the driving gear 55 through the hand-held sleeve 30.

[0071] It should be noted that, by setting the limiting roller 53, the rotating ring 51 can be suspended and rotatably set in the mounting ring groove 31. When the screwing block 56 is turned to drive the driving gear 55 to rotate, the driving gear 55 and the tooth ring 54 are engaged to drive the rotating ring 51 to rotate.

[0072] Furthermore, if Fig. 9 and Fig.10 As shown, at least six abutment blocks 57 are fixedly arranged at equal intervals on the inner wall of the rotating ring 51 along the circumferential direction, one end of the abutment block 57 passes through the slot 32 provided on the inner wall of the hand-held ring 30 and abuts against the detection probe 22; an elastic compression pad 58 is provided on the end surface of the abutment block 57 that contacts the detection probe 22.

[0073] In detail, a slope is also provided on one side of the resistance block 57. When the position of the detection probe 22 needs to be fixed, the screw block 56 can be turned to drive the rotating ring 51 to rotate. The rotation of the rotating ring 51 will also drive multiple resistance blocks 57 to rotate. The resistance block 57 rotates until it gradually fits and contacts with the detection probe 22. When the resistance block 57 rotates to the point where it interferes with the side wall of the slot 32 and cannot continue to rotate, the position of the detection probe 22 can be tightly fixed by the cooperation of the elastic extrusion pad 58. When the detection probe 22 needs to be removed, the screw block 56 can be turned in the opposite direction to rotate the resistance block 57 to the other side of the slot 32. At this time, the resistance block 57 removes the resistance to the detection probe 22, making it easy to disassemble and remove the detection probe 22.

[0074] like Figure 2 and Fig.11 As shown, the fixing structure includes a foot 12 with anti-slip grooves on the outside, a supporting stud 13 is fixedly arranged on the inner side of the foot 12, one end of the supporting stud 13 is threaded through the sealing cover plate 11 and fixedly connected to a connecting stud 14; a fixed cross beam 15 is arranged inside the protective housing 10 at the top of the ultrasonic flaw detector 21 and corresponding to the two connecting studs 14, and screw holes matching the connecting studs 14 are opened on the fixed cross beam 15.

[0075] Specifically, when the sealing cover plate 11 and the protective shell 10 are sealed and closed, the foot 12 can be twisted to move the connecting stud 14 into the screw hole. The screw hole has a certain depth. In this way, when the foot 12 is moved to fit the sealing cover plate 11, the sealing cover plate 11 and the protective shell 10 can be fixed by connecting the stud 14 and fixing the cross beam 15.

[0076] It should also be noted that when the sealing cover plate 11 is separated from the protective shell 10, the connecting studs 14 can be loosened and separated from the screw holes, and the connecting studs 14 can be moved to fit with the inner side of the sealing cover plate 11. At this time, the sealing cover plate 11 can be horizontally supported by the foot 12, and the sealing cover plate 11 can be used as a detection workbench.

[0077] Furthermore, if Figure 2 As shown, the sealing cover plate 11 is provided with an inspection groove for placing the inspection casting in the middle of one side of the workbench, and a card slot 16 for inserting the inspection probe 22 is provided on one side of the inspection groove. When the sealing cover plate 11 is closed, the inspection probe 22, the hand-held ring 30 and the coupling agent coating assembly 40 can be placed in the placement chamber formed between the ultrasonic flaw detector 21 and the two fixed beams 15.

[0078] In detail, after the use of the detection tool is completed, the bottom of the detection probe 22 can be inserted into the card slot 16. One side of the card slot 16 is also connected to a groove for placing the bottom of the extrusion plate 41. In this way, when the sealing cover plate 11 and the protective shell 10 are sealed and closed, the placement chamber can avoid interference with the detection probe 22, the handheld ring 30 and the coupling agent application assembly 40, and a handle can also be provided on the top of the protective shell 10 to facilitate carrying the detection tool.

[0079] Embodiment 3

[0080] The present invention also provides a method for detecting non-metallic inclusions in powder metallurgy tool steel, comprising the following steps:

[0081] S1: First, open the sealing cover plate 11 and support the sealing cover plate 11 horizontally through the support feet 12 and the support studs 13 to serve as a testing workbench, and then place the powder metallurgy tool steel to be tested in the testing tank;

[0082] S2: Apply coupling agent to the surface of the powder metallurgy tool steel. Press the extrusion plate 41 downward with the index finger. When the extrusion plate 41 is forced to drive the piston 44 to move downward, the coupling agent in the liquid storage box 43 will be squeezed outward through the liquid outlet 46 to the surface of the powder metallurgy tool steel. When the piston 44 continues to move downward until the sealing cone 45 is pushed into the liquid outlet 46, the liquid outlet 46 will stop discharging liquid. Then, the coupling agent is evenly applied through the application pad 42.

[0083] S3: Place the detection probe 22 on the surface of the powder metallurgy tool steel and perform a comprehensive scan of the sample using a linear scanning method. When the ultrasonic wave encounters inclusions, the ultrasonic flaw detector 21 will display a reflected wave signal. Based on the intensity, position and time information of the reflected wave, the position and size of the non-metallic inclusions can be determined.

[0084] Working principle:

[0085] When the inspection tool is needed, the sealing cover plate 11 is opened and the sealing cover plate 11 is supported horizontally by the feet 12 and the support studs 13 to be used as an inspection workbench, and then the powder metallurgy tool steel to be inspected is placed in the inspection tank;

[0086] When it is necessary to apply coupling agent to the surface of the powder metallurgy tool steel, first move the shifting block 496 to separate the two limit cross bars 495 from the limit notch 411, then place the thumb and middle finger on both sides of the hand-held ring 30 to pick it up and take out the detection probe 22 from the slot 16, press the extrusion plate 41 downward with the index finger, when the extrusion plate 41 is forced to drive the piston 44 to move downward, the coupling agent in the liquid storage box 43 will be squeezed outward to the surface of the powder metallurgy tool steel through the liquid outlet 46, when the piston 44 continues to move downward until the sealing cone 45 is pushed into the liquid outlet 46, the liquid outlet 46 will not continue to discharge liquid, and then the coupling agent can be evenly applied through the application pad 42, after the application is completed, remove the extrusion of the extrusion plate 41 with the index finger, and then the powder metallurgy tool steel can be tested through the detection probe 22;

[0087] To fix and disassemble the detection probe 22, the screw block 56 is turned to drive the rotating ring 51 to rotate. The rotation of the rotating ring 51 will also drive multiple interference blocks 57 to rotate. The interference blocks 57 are rotated until they gradually fit and interfere with the detection probe 22. When the interference blocks 57 are rotated to the point where they interfere with the side walls of the slot 32 and cannot continue to rotate, the position of the detection probe 22 can be tightly fixed by the cooperation of the elastic extrusion pad 58. When it is necessary to remove the fixation of the detection probe 22, the screw block 56 can be turned in the opposite direction to rotate the interference blocks 57 to the other side of the slot 32. At this time, the interference blocks 57 remove the interference with the detection probe 22, making it easy to disassemble and remove the detection probe 22.

[0088] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for detecting non-metallic inclusions in powder metallurgy tool steel, characterized in that: include: A protective shell (10) and a sealing cover plate (11) which is arranged on the front side of the protective shell (10) by means of a hinge and is used to seal the protective shell (10); An ultrasonic detection assembly (20) for detecting non-metallic inclusions, the ultrasonic detection assembly (20) comprising an ultrasonic flaw detector (21) and a detection probe (22) electrically connected to the ultrasonic flaw detector (21) via a wire, the outer side of the detection probe (22) being provided with a hand-held ring (30) in an annular shape and convenient for hand-holding; A coupling agent smearing assembly (40) is provided at the front end of the handheld collar (30), the coupling agent smearing assembly (40) comprising an extrusion plate (41) and an smearing pad (42) that can move up and down, the coupling agent smearing assembly (40) quickly extrude the coupling agent onto the surface of the powder metallurgy tool steel to be tested through the extrusion of the extrusion plate (41) and evenly smears the coupling agent through the smearing pad (42); The squeezing plate (41) is provided with limiting notches (411) on both sides of the top of the hand-held collar (30), and a locking mechanism (49) for limiting and locking the position of the squeezing plate (41) is arranged in the limiting notches (411); The locking mechanism (49) comprises: A fixed sleeve (491) is fixedly arranged on the back side of the extrusion plate (41), and a rotating cylinder (492) with a hollow interior is arranged inside the fixed sleeve (491), the rotating cylinder (492) is rotatably connected to the fixed sleeve (491) via bearing seats arranged on the outside of both ends, and a shifting block (496) is rotatably arranged in the middle of the fixed sleeve (491), and the shifting block (496) is fixedly arranged in the middle of the rotating cylinder (492); Two fixing nuts (493) are respectively fixedly disposed at two ends of the rotating drum (492), and movable studs (494) are respectively threadedly connected in the two fixing nuts (493); One end of the movable stud (494) is slidably disposed in the rotating cylinder (492), and the other end of the movable stud (494) is fixedly provided with an L-shaped limiting cross bar (495) corresponding to the limiting notch (411), and one end of the limiting cross bar (495) located inside the rotating cylinder (492) is fixedly provided with a limiting slide seat, and the limiting slide seat is slidably disposed in a limiting slide groove provided on the inner wall of the fixed sleeve (491) in cooperation with the limiting slide seat; An annular mounting groove (31) is provided inside the hand-held sleeve ring (30), and an abutment clamping assembly (50) for clamping the position of the detection probe (22) is arranged inside the mounting groove (31); The interference clamping assembly (50) comprises: An annular rotating ring (51) is suspended in the mounting ring groove (31) and an outer wall of the rotating ring (51) is provided with a limiting ring groove (52), and at least three limiting rollers (53) are provided in the limiting ring groove (52) for limiting and rolling. A toothed ring (54) is disposed between two adjacent limiting rollers (53) in the limiting ring groove (52), a driving gear (55) is meshed with one side of the toothed ring (54), and a screwing block (56) is fixedly disposed at the axis of the driving gear (55) through the hand-held sleeve ring (30).

2. The device for detecting non-metallic inclusions in powder metallurgy tool steel according to claim 1, characterized in that: The coupling agent application component (40) further comprises: A liquid storage box (43) for storing coupling agent, the liquid storage box (43) being fixedly arranged at the front end of the hand-held ring (30) and having a plate-shaped piston (44) slidably and sealingly arranged inside the liquid storage box (43), a sealing cone column (45) having an inverted conical bottom being fixedly arranged on one side of the bottom end of the piston (44), and a liquid outlet hole (46) penetrating through the bottom end of the liquid storage box (43) corresponding to the sealing cone column (45); The liquid storage bottle (412) is used to supply the liquid storage box (43), and a connecting pipe is threadedly connected to the bottom of the liquid storage bottle (412), one end of the connecting pipe is connected to the interior of the liquid storage box (43), and a one-way valve is provided at the pipe mouth.

3. The device for detecting non-metallic inclusions in powder metallurgy tool steel according to claim 2, characterized in that: The squeezing plate (41) is in an inverted U-shape, and the bottom of the squeezing plate (41) sequentially slides through the top and bottom of the liquid storage box (43) and is fixedly connected to the piston (44), and when the squeezing plate (41) is not squeezed, the bottom position of the squeezing plate (41) is higher than the bottom position of the detection probe (22); A support spring (47) is fixedly disposed at the bottom end of the top of the squeezing plate (41) to facilitate its reset after squeezing, and the bottom end of the support spring (47) is fixedly connected to the hand-held ring (30); The corners at the bottom of the extrusion plate (41) are arranged in an arc shape, and the smear pad (42) is adhered to the outer surface of the extrusion plate (41) through a Velcro patch (48) arranged on the outer wall of the extrusion plate (41) and is L-shaped, and an easy-tear opening (410) is provided at the edge of the bottom of the extrusion plate (41) for facilitating the tearing of the smear pad (42).

4. The device for detecting non-metallic inclusions in powder metallurgy tool steel according to claim 1, characterized in that: At least six abutment blocks (57) are fixedly arranged at equal intervals on the inner side wall of the rotating ring (51) along the circumferential direction, and one end of the abutment block (57) passes through a slot (32) provided on the inner side wall of the hand-held sleeve ring (30) to abut against the detection probe (22); An elastic pressing pad (58) is provided on the end surface of the abutment block (57) that contacts the detection probe (22).

5. The device for detecting non-metallic inclusions in powder metallurgy tool steel according to claim 1, characterized in that: Both sides of the top of the sealing cover plate (11) are provided with fixing structures for connecting the sealing cover plate (11) to the protective housing (10), and when the sealing cover plate (11) is placed horizontally, it is used as a detection workbench and its position is supported and placed by the two fixing structures; The fixing structure comprises a foot (12) with anti-slip grooves on the outside, a supporting stud (13) is fixedly arranged on the inside of the foot (12), and one end of the supporting stud (13) is threadedly passed through the sealing cover plate (11) and is fixedly connected to a connecting stud (14); A fixed crossbeam (15) is provided inside the protective housing (10) at the top of the ultrasonic flaw detector (21) and corresponding to the two connecting studs (14). The fixed crossbeam (15) is provided with screw holes that match the connecting studs (14).

6. The device for detecting non-metallic inclusions in powder metallurgy tool steel according to claim 5, characterized in that: The sealing cover plate (11) is used as a workbench and has a detection groove for placing powder metallurgy tool steel in the middle. A slot (16) for inserting a detection probe (22) is provided on one side of the detection groove. When the sealing cover plate (11) is closed, the detection probe (22), the hand-held ring (30) and the coupling agent application assembly (40) can be placed in a placement chamber formed between the ultrasonic flaw detector (21) and the two fixed beams (15).

7. A method for detecting non-metallic inclusions in powder metallurgy tool steel, applied to a device for detecting non-metallic inclusions in powder metallurgy tool steel as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: S1: First, the sealing cover plate (11) is opened and the sealing cover plate (11) is supported horizontally by the support feet (12) and the support studs (13) to serve as a testing workbench, and then the powder metallurgy tool steel to be tested is placed in the testing tank; S2: Coupling agent is applied to the surface of the powder metallurgy tool steel. The extrusion plate (41) is pressed downward by the index finger. When the extrusion plate (41) is forced to drive the piston (44) to move downward, the coupling agent in the liquid storage box (43) is squeezed outward through the liquid outlet hole (46) onto the surface of the powder metallurgy tool steel. When the piston (44) continues to move downward until the sealing cone column (45) is pushed into the liquid outlet hole (46), the liquid outlet hole (46) will no longer discharge liquid. Then, the coupling agent is evenly applied by the coating pad (42); S3: Place the detection probe (22) on the surface of the powder metallurgy tool steel and perform a comprehensive scan of the sample using a linear scanning method. When the ultrasonic wave encounters an inclusion, the ultrasonic flaw detector (21) will display a reflected wave signal. Based on the intensity, position and time information of the reflected wave, the position and size of the non-metallic inclusion can be determined.

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