JP5881097B2 - Slurry injection device used for subject evaluation - Google Patents

Description

  The present invention relates to a slurry injection device used for subject evaluation.

  Conventionally, for example, a slurry in which abrasive grains and a liquid are mixed, as disclosed in JP-A-2001-183279, JP-A-2006-184188, and JP-A-2010-237073, is jetted together with compressed air at a high speed. For example, a subject evaluation method has been proposed in which a subject such as a ceramic material collides with a subject for a certain period of time and the wear volume of the subject is measured to evaluate the wear strength of the subject.

  By the way, the injection of the slurry onto the surface of the subject in this subject evaluation method includes a slurry supply unit for supplying the slurry, a compressed air supply unit for supplying the compressed air, and a nozzle unit for injecting the slurry accelerated by the compressed air. However, in this conventional example, it takes time until the injection is stabilized at the start of the slurry injection, and the injection is immediately performed at the end of the slurry injection. There is a problem that it does not stop, etc., and in the actual evaluation, the evaluation is also performed by the unstable injection of the slurry and the like, and the evaluation accuracy is lowered.

  Specifically, in the conventional example, as shown in FIG. 5, an overshoot (a portion a in FIG. 5) with a large amount of shaving occurs for a long time at the start of slurry injection, and the inertia shaving that scrapes with inertia at the end of slurry injection. (The arrow b portion in FIG. 5) occurs, and these overshoots and coasting cuts cause the evaluation accuracy to deteriorate. For example, when evaluating by injecting slurry continuously for a long time as shown in FIG. Is less affected by the overshoot and the dwarfing, so the evaluation accuracy is not significantly affected.

  However, when the evaluation is performed by intermittently injecting the slurry for a short time as shown in FIG. 6, the ratio of overshoot and inertia cutting increases, and the evaluation accuracy is significantly reduced. 5 and 6, the horizontal axis represents time, and the vertical axis represents the amount of wear.

  In addition, when the wear rate obtained from the slurry injection amount and the wear depth is graphed (the horizontal axis is the slurry injection amount and the vertical axis is the wear depth), the overshoot and the inertia cutting cause long-time injection. It does not agree with the short-time injection, and also in this respect, it is clear that the evaluation accuracy is low when the short-time injection is performed.

JP 2001-183279 A JP 2006-184188 A JP 2010-237073 A

  The present applicant has advanced further research and development on the above-described slurry injection device, and as a result, it is possible to reduce as much as possible the overshoot and the dwarfing that have occurred in the above-described conventional example, for example, injecting slurry for a short time We have developed a slurry injection device used for epoch-making subject evaluation that exhibits unprecedented effects, such as improving the accuracy of evaluation when evaluated.

  The gist of the present invention will be described with reference to the accompanying drawings.

A slurry injection apparatus used for subject evaluation for evaluating a subject 20 by injecting slurry 3 in which abrasive grains 1 and liquid 2 are mixed with a subject 20 at a high speed together with compressed air 5. 3, a slurry supply unit 4 for supplying 3, a compressed air supply unit 6 for supplying the compressed air 5, and a nozzle unit 8 for injecting the slurry 3 accelerated by the compressed air 5. Is composed of a nozzle body 9 and a nozzle support body 12 that supports the nozzle body 9 and is connected to the slurry supply section 4 and the compressed air supply section 6. A slurry passage 13 for introducing the slurry 3 supplied from the section 4 into the nozzle body 9 and a compressed air passage 14 for introducing the compressed air 5 from the compressed air supply section 6 into the nozzle body 9 are provided. The path 13 is connected to the nozzle body 9 A slurry valve 15 for blocking the passage of the slurry 3 is provided, and a compressed air valve 16 for blocking the passage of the compressed air 5 to the nozzle body 9 is provided in the compressed air passage 14, and the slurry valve 15 Is provided at a distance of 20 to 100 mm from the nozzle body 9 in the nozzle support body 12, and the compressed air valve 16 is disposed in the nozzle support body 12 from the nozzle bodies 9 to 20 to 20-20 mm. A slurry return path 17 is provided at a distance of 100 mm, and the slurry valve 15 is disposed at the position where the slurry valve 15 is disposed, and the slurry 3 is returned to the slurry supply unit 4 when the slurry valve 15 is closed. The slurry return path 17 is provided with a small-diameter portion 18, and the present invention relates to a slurry injection apparatus used for subject evaluation.

Further, in the slurry ejection apparatus used in subjects evaluated according to claim 1 Symbol placement, to the setting of the volume ratio of the abrasive grains 1 and the liquid 2 constituting the slurry 3 to 1 / 1000-1 / 200 The present invention relates to a slurry jetting apparatus used for characteristic subject evaluation.

  Since the present invention is configured as described above, it is possible to reduce as much as possible the overshoot and inertia cutting that have occurred in the above-described conventional example, and for example, improve the evaluation accuracy when evaluating by injecting slurry for a short time. It becomes a slurry injection device used for epoch-making subject evaluation that exhibits an unprecedented operational effect.

It is use condition explanatory drawing which shows a present Example. It is a schematic operation | movement explanatory drawing of the principal part which concerns on a present Example. It is a schematic operation | movement explanatory drawing of the principal part which concerns on a present Example. It is a graph which shows the result of subject evaluation using a present Example. It is a graph which shows the result of subject evaluation using a conventional example. It is a graph which shows the result of subject evaluation using a conventional example.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

  The slurry 3 supplied from the slurry supply unit 4 is accelerated by the compressed air 5 supplied from the compressed air supply unit 6 and sprayed from the nozzle unit 8.

  Specifically, the slurry 3 and the compressed air 5 supplied from the slurry supply unit 4 and the compressed air supply unit 6 pass through the slurry path 13 and the compressed air path 14 provided on the nozzle support body 12 and then the nozzle body 9. For example, when the injection of the slurry 3 from the nozzle body 9 is started, the slurry valve 15 and the compressed air valve 16 provided in each of the slurry path 13 and the compressed air path 14 are opened, so that the slurry 3 And the compressed air 5 advances from this open position to the nozzle body 9, and the slurry 3 is accelerated by the compressed air 5 and injected from the nozzle body 9.

  In the present invention, as described above, the slurry valve 15 and the compressed air valve 16 are provided as close to the nozzle body 9 as possible, and from this configuration, the subject evaluation is performed by injecting the slurry 3 onto the subject 20. The evaluation accuracy can be improved.

  That is, in the case of the above-described conventional example, the slurry valve provided in the slurry pump that pumps the slurry and the compressed air valve that is provided in the compressed air pump that pumps the compressed air are provided at positions away from the nozzle body. At the start, there are portions (hollow portions) that are not filled with slurry and compressed air between the slurry valve and compressed air valve and the nozzle body (slurry passage and compressed air passage). Therefore, when the slurry valve and the compressed air valve are opened, the conventional example has a long time until the slurry and the compressed air are filled in the long cavity portion, and the flow rate of the slurry and the compressed air is increased more than necessary. As described above, it takes time from the start of slurry injection until the injection is stabilized, and overshoot occurs for a long time.

  On the other hand, at the end of injection, even after the slurry valve and the compressed air valve are closed, the slurry and the compressed air are supplied to the nozzle body, and the slurry is jetted from the nozzle body by inertia. At the end of injection, inertia cutting that occurs by inertia occurs for a long time.

  In this respect, according to the present invention, when the slurry valve 15 and the compressed air valve 16 are opened, the slurry 3 and the compressed air 5 immediately reach the nozzle body 9, and the slurry 3 becomes the compressed air 5. When the slurry valve 15 and the compressed air valve 16 are closed, the supply of the slurry 3 and the compressed air 5 to the nozzle body 9 is immediately stopped. Compared with the above-described conventional example, the time for overshooting and inertia cutting can be shortened to reduce improper cutting as much as possible. Therefore, for example, the evaluation when the slurry 3 is injected for a short time is evaluated. The accuracy can be improved, and as a result, the evaluation accuracy in the subject evaluation performed by injecting the slurry 3 onto the subject 20 can be improved.

  Further, according to the present invention, a slurry return path 17 for returning the slurry 3 to the slurry supply unit 4 when the slurry valve 15 is closed is provided at the position where the slurry valve 15 is provided as the slurry path 13. 3 is always a circulating type with a flow, so that the slurry concentration is guaranteed. Therefore, the evaluation accuracy can be improved also in this respect.

  Further, according to the present invention, since the small diameter portion 18 is provided in the slurry return path 17, the pressure of the slurry 3 can be guaranteed even if the slurry 3 is a circulation type. Can do.

  A specific embodiment of the present invention will be described with reference to the drawings.

  In this embodiment, the slurry supply unit 4 that supplies the slurry 3 in which the abrasive grains 1 and the liquid 2 are mixed, the compressed air supply unit 6 that injects the compressed air 5, and the slurry 3 that is accelerated by the compressed air 5 are used. And a nozzle portion 8 for jetting at high speed.

  In this embodiment, the slurry 3 injected from the nozzle portion 8 is made to collide with a subject 20 such as a ceramic material by a certain amount, and the wear volume of the subject 20 is measured to determine the wear strength of the subject 20. Although it is provided in the wear evaluation device to be evaluated, the present invention is not limited to this, and any device that exhibits the characteristics of the present embodiment can be used as appropriate.

  As shown in FIG. 1, the slurry supply unit 4 has a slurry storage container 21, one end connected to the slurry storage container 21, and the other end connected to a slurry path 13 provided in a nozzle support 12 described later. The slurry supply path 10 is provided with a slurry pump device 22 for pumping the slurry 3.

  Accordingly, the slurry 3 in the slurry storage container 21 is supplied to the slurry path 13 through the slurry supply path 10 by the operation of the slurry pump device 22.

  The compressed air supply part 6 is comprised by the compressed air pump apparatus 23 which produces the compressed air 5 as illustrated in FIG. 1, and the tubular compressed air supply path 11 extended from this compressed air pump apparatus 23. The compressed air supply path 11 is connected to a compressed air path 14 provided in a nozzle support 12 described later.

  Therefore, the compressed air 5 is supplied to the compressed air passage 14 through the compressed air supply passage 11 by the operation of the compressed air pump device 23.

  The nozzle unit 8 includes a nozzle body 9 and a nozzle support 12 that supports the nozzle body 9 and is connected to the slurry supply unit 4 and the compressed air supply unit 6.

  The nozzle body 9 is a long rod-like body having a circular injection port 9a at the lower end as shown in FIGS. 1 to 3, and the upper end (base end) is supported by a nozzle support 12 described later. The lower end portion (tip portion) is disposed in a suspended state in the processing space of the case-like base 24.

  Further, the nozzle body 9 is provided with a slurry introduction port portion 9b connected to the slurry passage 13 and a compressed air introduction port portion 9c connected to the compressed air passage 14 at the base end portion, and this slurry introduction port portion 9b. And a mixing chamber 9d for mixing the slurry 3 and the compressed air 5 introduced from the compressed air introduction port portion 9c, and a slurry passage 9e through which the accelerated slurry 3 produced in the mixing chamber 9d passes to the injection port portion 9a. It has been.

  In the present embodiment, the slurry 3 ejected from the ejection port portion 9a as the nozzle body 9 is a gun having a square cross section, but the slurry 3 ejected by providing the ejection port portion 9a in a slit shape is a flat plate shape. It may be a so-called wide gun.

  As shown in FIGS. 1 to 3, the nozzle support 12 is installed on the upper portion of the base 24 and is configured to support the base end portion of the nozzle body 9.

  The nozzle support 12 is provided with a tubular slurry passage 13 and a compressed air passage 14 inside, and one end of the slurry passage 13 and the compressed air passage 14 is formed by the slurry supply section 4 and the compressed air supply section 6. The other end is connected to the slurry inlet 9b and the compressed air inlet 9c of the nozzle body 9.

  A slurry valve 15 and a compressed air valve 16 are provided in the slurry path 13 and the compressed air path 14, respectively.

  As shown in FIG. 2, the slurry valve 15 and the compressed air valve 16 are configured by providing blocking action portions 15 a and 16 a at the tip of the cylinder device, and the blocking action portions 15 a and 16 a are formed by the nozzle support 12. It is configured to open and close a position as close as possible to the nozzle body 9 (slurry inlet port portion 9b and compressed air inlet port portion 9c) at a predetermined position in each of the slurry passage 13 and the compressed air passage 14 therein. Has been.

  Specifically, each of the slurry valve 15 and the compressed air valve 16 is provided at distances L1 and L2 of about 20 mm from the nozzle body 9. The distances L1 and L2 from the slurry valve 15 and the compressed air valve 16 to the nozzle body 9 are each effective from 20 mm to 100 mm.

  Therefore, when each of the slurry valve 15 and the compressed air valve 16 is opened, the slurry 3 and the compressed air 5 immediately reach the nozzle body 9, and the slurry 3 is accelerated by the compressed air 5 and injected. Therefore, the slurry 3 can be controlled better than the conventional example described above.

  Further, a slurry return path 17 for returning the slurry 3 to the downstream side when the slurry valve 15 is closed is provided at the position (opening / closing action position) of the slurry valve 15 as the slurry path 13.

  As shown in FIGS. 2 and 3, the slurry return path 17 is configured by providing a tubular portion that is turned back from the slurry path 13, and a slurry discharge pipe 26 is provided at the opening end of the nozzle support 12. It is recovered by a slurry recovery unit 25 described later.

  Therefore, even if the slurry 3 is in a state in which the slurry path 13 is closed by the slurry valve 15, the slurry 3 does not stagnate and always circulates and the concentration of the slurry 3 in the pipe is stabilized.

  The slurry return path 17 is provided with a small diameter portion 18 (orifice).

  The small-diameter portion 18 applies pressure to the slurry 3 in the slurry path 13, and therefore, by providing the slurry return path 17 as described above, a predetermined pressure is guaranteed even if the slurry 3 is circulated. Will be. In other words, the necessary pressure is always guaranteed before the slurry valve 15 and the compressed air valve 16.

  The slurry 3 ejected from the nozzle unit 8 falls freely to a slurry recovery unit 25 provided below the nozzle body 9 and below the subject 20, and is temporarily stored in the slurry recovery unit 25.

  The slurry 3 stored in the slurry recovery unit 25 is made to have a constant concentration (abrasive grains / liquid) by stirring with an agitator (not shown), or unwanted matter is removed by an unnecessary matter removing device that removes unwanted matter such as shavings. Or removed. The slurry 3 that can be reused in the slurry collecting section 25 is sent to a slurry storage container 21 adjacent to the slurry collecting section 25 through a feeding means 27 including a pump device 27a and a pipe body 27b.

  The abrasive grain 1 used in the present embodiment is composed of fine particles such as resin, metal, ceramics, and glass having a diameter of several μm to several hundred μm. The abrasive grain 1 is mixed with water 2 to form a slurry 3. . In addition to water, depending on the purpose, for example, an aqueous solution such as an alkali may be used for degreasing, or a solvent such as an alcohol may be used.

  In this embodiment, the volume ratio between the abrasive grains 1 and the liquid 2 constituting the slurry 3 is set to 1/1000 to 1/200.

  Since the present embodiment is configured as described above, the slurry 3 and the compressed air 5 supplied from the slurry supply unit 4 and the compressed air supply unit 6 are connected to the slurry path 13 and the compressed air path 14 provided in the nozzle support 12. For example, when the injection of the slurry 3 from the nozzle body 9 is started, the slurry valve 15 and the compressed air valve 16 provided in the slurry path 13 and the compressed air path 14 are respectively set. By opening, the slurry 3 and the compressed air 5 go from the open position to the nozzle body 9, and the slurry 3 is accelerated by the compressed air 5 and injected from the nozzle body 9.

  In the present embodiment, each of the slurry valve 15 and the compressed air valve 16 is provided as close as possible to the nozzle body 9. From this configuration, when the slurry valve 15 and the compressed air valve 16 are opened, the slurry 3 The compressed air 5 immediately reaches the nozzle body 9 and the slurry 3 is accelerated by the compressed air 5 and injected, and when the slurry valve 15 and the compressed air valve 16 are closed, the slurry 3 Therefore, the compressed air 5 is immediately stopped from being supplied to the nozzle body 9, and therefore, compared with the above-described conventional example, the overshoot and the inertia cutting time are shortened to make the abnormal cutting portion as possible as possible. Therefore, for example, it is possible to improve the evaluation accuracy when the slurry 3 is evaluated by being injected by short-time injection.

  Specifically, FIG. 4 is a case where the slurry 3 is intermittently injected for a short time using the slurry injection apparatus according to the present embodiment, and is graphed with the horizontal axis representing time and the vertical axis representing the amount of wear. is there.

  Compared to FIG. 6 illustrating the case where the above-described conventional example is used, the time for overshoot (arrow a portion) and inertia cutting at the injection end timing (arrow b portion) is shortened.

  That is, as compared with the conventional example, even when the slurry 3 is intermittently ejected for a short time, the ratio of the abnormal shaving portion is reduced, so that the evaluation accuracy is not lowered.

  Therefore, according to the present embodiment, highly accurate evaluation can be performed in the subject evaluation performed by injecting the slurry 3 onto the subject 20.

  Further, in this embodiment, a slurry return path 17 for returning the slurry 3 to the slurry supply section 4 when the slurry valve 15 is closed is provided at the position where the slurry valve 15 is provided as the slurry path 13. Thus, the slurry 3 having a stable concentration can be obtained.

  Further, in this embodiment, since the small diameter portion 18 is provided in the slurry return path 17, even if the slurry 3 is circulated by the slurry return path 17, a predetermined pressure is guaranteed.

  Note that the present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate.

DESCRIPTION OF SYMBOLS 1 Abrasive grain 2 Liquid 3 Slurry 4 Slurry supply part 5 Compressed air 6 Compressed air supply part 8 Nozzle part 9 Nozzle body
12 Nozzle support
13 Slurry road
14 Compressed air passage
15 Slurry valve
16 Compressed air valve
17 Slurry return path
18 small diameter part
20 subjects

Claims (2)

A slurry supply device used for subject evaluation for evaluating a subject by injecting a slurry in which abrasive grains and liquid are mixed with a compressed air at a high speed, and supplying the slurry. And a compressed air supply part for supplying the compressed air, and a nozzle part for injecting the slurry accelerated by the compressed air. The nozzle part supports the nozzle body and supports the nozzle body. The nozzle support is connected to the supply unit and the compressed air supply unit. The nozzle support includes a slurry path for introducing the slurry supplied from the slurry supply unit into the nozzle body and the compressed air. A compressed air path for introducing the compressed air from the supply unit to the nozzle body is provided, and the slurry path is provided with a slurry valve for preventing the passage of the slurry to the nozzle body, The serial compressed air passage, the compressed air valve to prevent the passage of compressed air is provided to the nozzle body, said Suraribarubu is to the nozzle support body provided at a distance of 20~100mm from said nozzle body The compressed air valve is provided in the nozzle support body at a distance of 20 to 100 mm from the nozzle body, and the slurry valve is closed at the position where the slurry valve is provided as the slurry path. A slurry return path for returning the slurry to the slurry supply section, and a small diameter section is provided in the slurry return path. In the slurry injection system used in the subject evaluation of claims 1 Symbol placement, subject, characterized in that setting the volume ratio of the abrasive grains and the liquid constituting the slurry to 1 / 1000-1 / 200 Slurry injection device used for evaluation.

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