CN104437211A - Magnetic suspension mixing and stirring device for online magnetic powder inspection of wheels - Google Patents

Abstract

The invention discloses a magnetic suspension mixing and stirring device for online magnetic powder inspection of wheels and belongs to accessories of magnetic particle flaw detectors. According to the device, a pumping hole, a return hole and an overflow hole are formed in a stirring barrel; a baffle plate with a baffle hole is annularly arranged inside the barrel wall; the barrel wall and the baffle plate form a baffle cavity; the return hole in the barrel wall is connected with the baffle cavity in a communicated mode; a one-way quantitative hydraulic pump of a liquid flow stirring mechanism is respectively connected with the pumping hole, the return hole and the overflow hole in the stirring barrel and a spraying mechanism by virtue of a valve and a pipeline in a communicated mode; a gas inlet pipe of a gas stirring mechanism stretches into the bottom by virtue of a central axis of the stirring barrel and is connected with a ring pipe; and the ring pipe with a gas outlet hole is fixedly arranged on the inner side of the bottom of the stirring barrel. The magnetic suspension mixing and stirring device disclosed by the invention has the advantages that a liquid return mechanism and a pneumatic stirring mechanism are combined, the magnetic suspension forms splash liquid flow by virtue of the baffle hole in the baffle plate, and the turbulent extent of the magnetic suspension is improved; and moreover, the ring pipe of the pneumatic stirring mechanism forms ascending airflow at the bottom of the stirring barrel, autoprecipitation of the magnetic powder is offset, the amount of the magnetic powder is reduced, and the accuracy of the detection result is high.

Description

Magnetic suspension mixing device for on-line magnetic particle flaw detection of wheels

technical field

The invention belongs to an accessory of a magnetic particle flaw detector, in particular to a magnetic suspension stirring device for a wheel online magnetic particle flaw detector.

Background technique

After the train wheel is finished, it needs to be inspected by a magnetic particle inspection machine on the inspection line. The magnetic particle flaw detector uses the magnetized ferromagnetic material to deform on the surface or near the surface of the defect, and escapes from the wheel surface to form a detectable leakage magnetic field, which attracts the magnetic powder, so that the magnetic powder accumulates at the defect and forms a magnetic mark. The location and shape of the defect is revealed under the best lighting conditions. In order to ensure the detection sensitivity and detection efficiency, the magnetic particle flaw detector uses fluorescent magnetic suspension to detect in a continuous method. The precipitation concentration of the magnetic suspension is a key indicator to ensure the detection sensitivity. Too high a concentration will cause too high a contrast, which will affect the detection and observation. , Too low concentration causes a sharp drop in sensitivity, and it is difficult to find small defects. Therefore, before using the magnetic particle flaw detector, it is necessary to stir the magnetic suspension for at least 20 minutes in advance to ensure the uniformity of the concentration of the magnetic suspension. At present, the magnetic suspension of the magnetic particle flaw detector is stirred by a liquid flow stirring device or a mechanical stirring device.

The magnetic suspension liquid flow stirring device is composed of a mixing barrel, a hydraulic pump, and a pipeline. The hydraulic pump is fixed on the mixing barrel. There is a pumping hole on one side of the bottom of the mixing barrel, and a return hole in the middle. The pipeline is connected to the pumping hole and the hydraulic pump. and return holes. The existing problem is that after the hydraulic pump extracts the magnetic suspension, the magnetic suspension directly flows back to the barrel through reflux, causing local stirring in the barrel and even a stirring blind area, uneven stirring of the magnetic suspension, and excessive precipitation of magnetic powder, resulting in succession calibration. When the precipitation concentration of the magnetic suspension is 0.3ml/100ml, it will drop to the range of 0.1ml/100ml after 30 minutes of operation. A large amount of magnetic powder will settle to the bottom of the mixing tank and cannot be used, which will seriously affect the sensitivity of online detection; in order to ensure the sensitivity of detection, it is necessary to add a large amount of Magnetic powder, resulting in serious waste of magnetic powder, increased production costs.

The magnetic suspension mechanical stirring device is composed of a stirring barrel, a stirring shaft, a motor and a reducer. The motor is connected to the reducer, and the output shaft of the reducer is connected to the stirring shaft to form a whole and placed above the stirring barrel. The stirring shaft extends into the stirring barrel. The problem is that the rotation of the stirring shaft drives the fluid to move in a tangential circle, forming eddy currents, resulting in low turbulence and uneven stirring of the magnetic suspension; due to the centrifugal force, the magnetic powder and fluorescent dye are separated, affecting the quality of the magnetic powder, and then affect the test results.

Contents of the invention

In order to overcome the defects of the prior art, the object of the present invention is to provide a magnetic suspension mixing device for on-line magnetic particle flaw detection of wheels, which can change the flow direction of the fluid, reduce the centrifugal force, avoid excessive precipitation of magnetic powder, reduce the amount of magnetic powder, and make the magnetic powder uniform Dispersed in the dispersant to reduce production costs and ensure test results.

The magnetic suspension mixing and stirring device for online magnetic particle flaw detection of wheels is characterized in that the device is composed of a stirring tank, a liquid flow stirring mechanism and a gas stirring mechanism. A baffle plate with a baffle hole is arranged on the inner ring of the wall, and the barrel wall and the baffle plate form a baffle cavity, and the return hole on the barrel wall is connected with the baffle cavity; the one-way quantitative hydraulic pump of the liquid flow stirring mechanism passes through the Valves, pipelines are connected to the pumping hole, return hole, overflow hole and spray mechanism of the mixing tank; the gas mixing mechanism composed of an air inlet pipe and a ring pipe is set in the mixing bucket, and the air inlet pipe extends from the central axis of the mixing bucket. The inlet bottom is connected with the ring pipe, and the ring pipe with air outlet is fixed inside the bottom of the mixing tank.

The invention is further improved. The liquid flow stirring mechanism is composed of a one-way quantitative hydraulic pump, a two-position three-way electromagnetic reversing valve, a first speed regulating valve, a second speed regulating valve and pipeline connections. The one-way quantitative hydraulic pump is fixed On the outside of the mixing tank, the liquid outlet pipe is connected with the pumping hole. The outlet of the one-way quantitative hydraulic pump forms two pipelines. The first pipeline is composed of the first speed regulating valve and the two-position three-way electromagnetic reversing valve. The three-way electromagnetic reversing valve is provided with a discharge port A and a discharge port B, the discharge port A is used to clean the waste liquid outlet of the stirring device, and the discharge port B is connected to the spray mechanism; the second pipeline is connected to the second regulator The speed valve and the return pipe are connected. The return pipe is connected with the return hole on the mixing tank. The magnetic suspension is turned up and down in the mixing tank by the action of the liquid flow stirring mechanism, eliminating the short circuit of the liquid flow and improving the turbulence of the magnetic suspension. .

The present invention is further improved. The gas stirring mechanism is composed of an inlet pipe, a first ring pipe, a second ring pipe, a third ring pipe, and a connecting pipe. The diameter of the third ring pipe is compatible with the inner diameter of the mixing tank. The ring pipe, the second ring pipe, and the third ring pipe are concentrically and evenly distributed and welded on the inside of the bottom of the mixing tank. connection; the first ring pipe, the second ring pipe, and the third ring pipe are all equipped with vertical upward air outlets, the number of which is at least 8, 12, and 16 respectively. precipitation.

The present invention is further improved, the baffle is composed of a horizontal plate and a vertical plate, the vertical plate is cylindrical, the outer diameter is 5-8 mm smaller than the inner diameter of the mixing bucket, and three rings of baffle holes are arranged radially in the middle and lower parts of the vertical plate, There are at least four baffle holes in each circle, and the central axis of the baffle holes is obliquely upward and at an angle of 30° to the horizontal plane. The injection speed of the magnetic suspension is fast and the stroke is long, which enhances the up and down flipping of the magnetic suspension; the horizontal plate is circular, The outer edge is tightly welded to the wall of the mixing barrel, and the inner edge is tightly welded to the vertical plate, so that the baffle plate and the barrel wall form a closed chamber.

The present invention is further improved. The outlet of the one-way quantitative hydraulic pump is provided with a return flow branch composed of an overflow valve and an overflow pipe. The overflow pipe is connected to the overflow hole to stabilize the outlet pressure of the one-way quantitative hydraulic pump. Ensure the safe operation of the liquid return mechanism.

The present invention is further improved, the inner diameter of the first ring pipe, the second ring pipe, and the third ring pipe are all 14mm, and the outer diameter is 16mm.

The present invention is further improved, the diameter of the air outlet is 4mm.

The present invention is further improved, the diameter of the baffle hole is 4mm.

When in use, add magnetic powder and dispersant to the mixing tank, and increase the second speed control valve to make the magnetic suspension uniform quickly and save mixing time; when the spray system is working, turn on the air source, and the pneumatic stirring mechanism will work. Properly adjust the second speed regulating valve according to the concentration of the magnetic suspension, so that the magnetic powder is evenly distributed in the dispersant; according to the size of the workpiece to be tested, properly adjust the first speed regulating valve to achieve the best spraying effect.

Compared with the existing technology, the advantage is that the concept is novel, the structure is simple and reasonable; the device adopts a combination of a liquid return mechanism and a pneumatic stirring mechanism, and the magnetic suspension passes through the baffle holes on the baffle to form a splash flow, Change the flow direction of the fluid, turn it up and down in the mixing tank, eliminate the short circuit phenomenon of the liquid flow, increase the turbulent flow of the magnetic suspension, and reduce the centrifugal force; the ring pipe of the pneumatic stirring mechanism forms an upward airflow at the bottom of the mixing tank to offset the self-precipitation of the magnetic powder, and the magnetic powder The dosage is reduced, the magnetic powder is evenly dispersed in the dispersant, the production cost is reduced, and the accuracy of the detection result is high.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 is a structural schematic diagram of a magnetic suspension mixing device for on-line magnetic particle flaw detection of wheels;

Fig. 2 is a sectional view along line A-A of Fig. 1;

Figure 3 is that of Figure 2 Enlarged view of the part;

Fig. 4 is a sectional view along line B-B of Fig. 3;

Figure 5 is that of Figure 2 Enlarged view of the part;

Fig. 6 is a sectional view along line C-C of Fig. 5 .

In the figure: 1-mixing barrel, 101-baffle plate, 102-baffle chamber, 103-reflux hole, 104-pumping hole, 105-baffle hole, 106-overflow hole, 2-liquid return mechanism, 201 -Two-position three-way electromagnetic reversing valve, 202-first speed control valve, 203-second speed control valve, 204-one-way quantitative hydraulic pump, 205-liquid outlet pipe, 206-return pipe, 207-overflow valve , 208-overflow pipe, 3-pneumatic stirring mechanism, 301-intake pipe, 302-first ring pipe, 303-second ring pipe, 304-third ring pipe, 305-connecting pipe, 306-air outlet, 4 - spray mechanism.

Detailed ways

The present invention will be further described in detail below in conjunction with the embodiments.

It can be seen from Figures 1 to 6 that the magnetic suspension mixing and stirring device for on-line magnetic particle flaw detection of wheels is composed of a stirring tank 1, a liquid flow stirring mechanism 2 and a gas stirring mechanism 3, and the stirring tank is provided with a pumping hole 104. Backflow hole 103, overflow hole 106, a baffle plate 101 with a baffle hole 105 is provided on the inner ring of the barrel wall, and the barrel wall and the baffle plate form a baffle cavity 102, and the reflux hole on the barrel wall is connected to the baffle cavity The one-way quantitative hydraulic pump 204 of the liquid flow stirring mechanism is respectively connected to the pumping hole, the return hole, the overflow hole and the spraying mechanism 4 of the mixing tank through the valve and the pipeline; 302; 303; 304), the gas mixing mechanism is set in the mixing barrel, the inlet pipe extends from the central axis of the mixing barrel to the bottom and connects with the ring pipe, and the ring pipe with air hole 306 is fixed inside the bottom of the mixing barrel.

It can also be seen from FIG. 1 that the liquid flow stirring mechanism 2 is connected by a one-way quantitative hydraulic pump 204, a two-position three-way electromagnetic reversing valve 201, a first speed regulating valve 202, a second speed regulating valve 203 and pipelines. The one-way quantitative hydraulic pump is fixed on the outside of the mixing tank and is connected to the pumping hole 104 by the liquid outlet pipe 205. The outlet of the one-way quantitative hydraulic pump forms two pipelines. The first pipeline is composed of the first speed regulating valve and the two-position The three-way electromagnetic reversing valve is connected. The two-position three-way electromagnetic reversing valve is equipped with a discharge port A and a discharge port B. The discharge port A is used to clean the waste liquid outlet of the stirring device, and the discharge port B is connected to the spray The mechanism 4 is connected; the second pipeline is formed by connecting the second speed regulating valve and the return pipe 206, and the return pipe is connected with the return hole 103 on the mixing tank 1, and the magnetic suspension is turned up and down in the mixing tank by the action of the liquid flow stirring mechanism , Eliminate the short circuit phenomenon of the liquid flow, and improve the turbulent flow of the magnetic suspension.

It can also be seen from Figs. 1 and 2 that the pneumatic stirring mechanism 3 is composed of an inlet pipe 301, a first ring pipe 302, a second ring pipe 303, a third ring pipe 304, and a connecting pipe 305. The first ring pipe, Both the second ring pipe and the third ring pipe are copper ring pipes with an inner diameter of 14mm and an outer diameter of 16mm. The diameter of the third ring pipe is compatible with the inner diameter of the mixing tank 1. The pipe and the third ring pipe are concentrically and evenly distributed and welded on the inside of the bottom of the mixing tank. 1. The second loop pipe and the third loop pipe are provided with vertical upward air outlet holes 306, the diameter of the air outlet holes is 4mm, and the number thereof is at least eight, twelve, and sixteen respectively. The ring pipe forms an upward airflow at the bottom of the mixing tank. Counteracts self-precipitation of magnetic particles.

It can also be seen from Figures 1 to 4 that the baffle 101 is composed of a horizontal plate and a vertical plate, the vertical plate is cylindrical, the outer diameter is 5-8mm smaller than the inner diameter of the mixing tank 1, and the middle and lower parts of the vertical plate are radially uniform. Set three circles of baffle holes 105, the diameter of the baffle holes is 4mm, and each circle of baffle holes is at least four, the central axis of the baffle holes is obliquely upward and forms an angle of 30° with the horizontal plane, and the ejection speed of the magnetic suspension is fast and the stroke is short. Long, the enhanced magnetic suspension is turned up and down; the horizontal plate is in the shape of a ring, the outer edge is tightly welded to the wall of the mixing tank, and the inner edge is tightly welded to the vertical plate, so that the baffle plate and the barrel wall form a closed chamber.

It can also be seen from Fig. 1 that the outlet of the one-way quantitative hydraulic pump 204 is provided with a return flow branch formed by an overflow valve 207 and an overflow pipe 208, and the overflow pipe is connected with the overflow hole 106 to stabilize the one-way flow. The outlet pressure of the quantitative hydraulic pump ensures the safe operation of the liquid return mechanism.

Claims (8)

1. wheel online magnetic powder inspection magnetic flaw detection ink mixed stirring device, it is characterized in that this device is connected and composed by agitator (1), liquid stream rabbling mechanism (2) and gas rabbling mechanism (3), described agitator is provided with takes out material hole (104), return port (103), spout hole (106), bucket wall inner ring establishes the deflection plate (101) of band baffling hole (105), bucket wall and deflection plate form baffling chamber (102), and the return port on bucket wall connects with baffling chamber and communicates; The unidirectional quantitative hydraulic pump (204) of liquid stream rabbling mechanism is expected that hole, return port, spout hole and spraying mechanism (4) connect communicate through valve, being taken out of pipeline and agitator respectively; By air inlet pipe (301) and endless tube (302; 303; 304) the Gas Stirring mechanism formed is located in agitator, and air inlet pipe stretches into bottom by agitator central axis and is connected with endless tube, and the endless tube of band venthole (306) is fixed on agitator bottom inside.

2. wheel according to claim 1 online magnetic powder inspection magnetic flaw detection ink mixed stirring device, it is characterized in that described liquid stream rabbling mechanism (2) is by unidirectional quantitative hydraulic pump (204), two position, three-way electromagnetic change valve (201), first flow speed control valve (202), second flow speed control valve (203) and pipeline connect and compose, unidirectional quantitative hydraulic pump to be fixed on outside agitator and to be expected that hole (104) connects by drain pipe (205) and communicate with taking out, unidirectional quantitative hydraulic pump export mixes two bye-pass, first pipeline is connected and composed by the first flow speed control valve and two position, three-way electromagnetic change valve, two position, three-way electromagnetic change valve is established discharging port A and discharging opening B, discharging port A is for cleaning the waste liquid outlet of agitating device, discharging opening B is connected with spraying mechanism (4), second pipeline is connected and composed by the second flow speed control valve and return duct (206), and return duct is connected with the return port (103) on agitator (1).

3. wheel according to claim 1 online magnetic powder inspection magnetic flaw detection ink mixed stirring device, it is characterized in that described pneumatic stirring mechanism (3) is by air inlet pipe (301), first endless tube (302), second endless tube (303), 3rd endless tube (304), tube connector (305) connects and composes, the diameter of the 3rd endless tube and the internal diameter of agitator (1) adapt, first endless tube, second endless tube, 3rd endless tube concentric uniform distributes and is welded on agitator bottom inside, air inlet pipe is connected with the first endless tube, second endless tube by tube connector respectively with the first endless tube, 3rd endless tube connects, first endless tube, the second endless tube, the 3rd endless tube are all established venthole (306) vertically upward, its quantity is at least eight, 12,16 respectively.

4. the wheel online magnetic powder inspection magnetic flaw detection ink mixed stirring device according to claim 1 or 2 or 3, it is characterized in that described deflection plate (101) is made up of transverse slat and riser, riser cylindrically, external diameter is less than the internal diameter 5-8mm of agitator (1), riser middle and lower part radial direction all establishes three circle baffling holes (105), often enclose baffling hole and be at least four, the central axis in baffling hole is obliquely and horizontal by 30 ° of angles; Transverse slat is circular, and outer rim is closely welded with agitator wall, and inner edge is closely welded with riser, makes deflection plate and bucket wall form an airtight chamber.

5. wheel according to claim 2 online magnetic powder inspection magnetic flaw detection ink mixed stirring device, it is characterized in that the backflow branch road be made up of overflow valve (207) and overflow pipe (208) is established in the outlet of described unidirectional quantitative hydraulic pump (204), overflow pipe connects with spout hole (106) and communicates.

6. wheel according to claim 3 online magnetic powder inspection magnetic flaw detection ink mixed stirring device, it is characterized in that described first endless tube (302), the second endless tube (303), the 3rd endless tube (304) internal diameter be 14mm, external diameter is 16mm.

7. the online magnetic powder inspection magnetic flaw detection ink of the wheel according to claim 3 or 6 mixed stirring device, is characterized in that the diameter of described venthole (306) is 4mm.

8. wheel according to claim 4 online magnetic powder inspection magnetic flaw detection ink mixed stirring device, is characterized in that the diameter of described baffling hole (105) is 4mm.