CN115194165A - Low-temperature brittle metal powder grinding device - Google Patents
Low-temperature brittle metal powder grinding device Download PDFInfo
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- CN115194165A CN115194165A CN202211112691.5A CN202211112691A CN115194165A CN 115194165 A CN115194165 A CN 115194165A CN 202211112691 A CN202211112691 A CN 202211112691A CN 115194165 A CN115194165 A CN 115194165A
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- 238000004140 cleaning Methods 0.000 claims abstract description 43
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
- B08B1/12—Brushes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/30—Cleaning by methods involving the use of tools by movement of cleaning members over a surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/041—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by mechanical alloying, e.g. blending, milling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/049—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by pulverising at particular temperature
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- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention provides a low-temperature brittle metal powder grinding device, relates to the technical field of powder processing, and aims to solve the technical problem of long processing time caused by shutdown cooling due to cold welding during metal powder grinding in the prior art. A low temperature brittle metal powder grinding apparatus comprising: a box body; the box cover is arranged at the top of the box body; the grinding mechanism is arranged on the inner side of the box cover; the two grinding pieces are arranged in the box body and symmetrically arranged on the opposite sides of the grinding mechanism, and the top of each grinding piece is provided with a grinding groove; the liquid nitrogen temperature control mechanism is communicated with the interior of the box body; the auxiliary temperature control mechanism is communicated with the grinding mechanism and the grinding piece; and two cleaning mechanisms respectively mounted on the two grinding members, wherein the cleaning part of the cleaning mechanism is in contact with the grinding part of the grinding mechanism. The grinding mechanism provided by the invention intermittently grinds the metal powder, and timely cleans the residual metal powder on the grinding mechanism to prevent the metal powder from being cold-welded on the surface of the grinding mechanism.
Description
Technical Field
The invention relates to the technical field of powder processing, in particular to a low-temperature brittle metal powder grinding device.
Background
The metal powder has small size and large specific surface area, and the metal parts made of the metal powder have many different properties from the conventional materials, such as excellent mechanical properties, special magnetic properties, high conductivity and diffusivity, high reaction activity and catalytic activity, and the like. Due to the special properties, the metal powder material is more and more widely applied in the fields of aerospace, ships, automobiles, metallurgy, chemical industry and the like.
The preparation method of the metal powder includes a mechanical method, a physical-chemical method, and the like. The mechanical method has simple process and large yield when preparing metal powder, and can prepare ultrafine powder of high-melting-point metal and alloy which are difficult to obtain by the conventional method. However, the mechanical method makes a portion of the metal powder cold-welded to the surface of the grinding body as it continuously crushes and grinds the metal powder when preparing the metal powder. The existing cold welding method is to add ball grinding agent in the grinding process and then grind, but the grinding process needs to be stopped for cooling after being thrown away for a period of time.
Disclosure of Invention
The invention aims to solve the technical problem of cold welding of metal powder caused by grinding of metal powder in the prior art, and provides a low-temperature brittle metal powder grinding device.
The technical scheme adopted by the invention is as follows:
a low temperature brittle metal powder grinding apparatus comprising:
a box body;
the box cover is arranged at the top of the box body;
the grinding mechanism is arranged at the bottom of the box cover;
the two grinding pieces are arranged in the box body and symmetrically arranged on the opposite sides of the grinding mechanism, and a grinding groove is formed in the top of each grinding piece;
the liquid nitrogen temperature control mechanism is communicated with the interior of the box body;
the auxiliary temperature control mechanism is communicated with the grinding mechanism and the grinding piece; and
and the two cleaning mechanisms are respectively arranged on the two grinding pieces, and the cleaning parts of the cleaning mechanisms are contacted with the grinding parts of the grinding mechanisms.
Optionally, the grinding mechanism comprises:
one end of each mounting rod is connected with the bottom of the box cover, and the other end of each mounting rod faces the bottom of the box body;
the two first springs are sleeved on the two mounting rods respectively;
the mounting plate is connected with the two mounting rods in a sliding mode, and the first spring is located between the mounting plate and the box cover;
the two second springs are sleeved on the two mounting rods respectively;
the other ends of the two mounting rods are provided with the fixing plates, and the second spring is positioned between the fixing plates and the mounting plates;
the driving mechanism is arranged on the mounting plate and is provided with two output shafts, and the two output shafts face the two grinding pieces;
and the two striking hammers are respectively arranged on the two output shafts of the driving mechanism.
Optionally, an accommodating cavity is formed in the striking hammer, an air inlet channel and an air outlet channel which are communicated with the accommodating cavity are formed in the side wall, connected with the driving mechanism, of the striking hammer, and the air inlet channel is communicated with the auxiliary temperature control mechanism; the exhaust channel is connected to the outside of the tank body through an outer discharge pipeline.
Optionally, a temperature control cavity is arranged in the grinding piece, the auxiliary temperature control mechanism is connected to the inside of the temperature control cavity, and the temperature control cavity is connected to the outside of the box body through an auxiliary pipeline.
Optionally, the liquid nitrogen temperature control mechanism includes:
the liquid nitrogen storage tank is arranged on one side of the box body;
one end of the conveying pipeline is communicated with the liquid nitrogen storage tank, and the other end of the conveying pipeline is communicated with the box body;
the metering pump is arranged on the conveying pipeline;
the detection end of the thermometer is arranged in the box body, and the display end of the thermometer is arranged on the outer side wall of the box body;
and one end of the pressure control assembly is connected into the box body, and the other end of the pressure control assembly extends out of the box body.
Optionally, the pressure control assembly comprises:
one end of the pressure control pipeline is connected into the box body, and the other end of the pressure control pipeline is connected to the outer side of the box body;
the pressure control valve is arranged on the pressure control pipeline;
and a first signal output end of the controller is connected with a signal input end of the pressure control valve, a second signal output end of the controller is connected with a signal input end of the metering pump, and a first signal input end of the controller is connected with a signal output end of the thermometer.
Optionally, the auxiliary temperature control mechanism comprises:
one end of the auxiliary conveying pipe is connected with the liquid nitrogen storage tank;
one end of the three-way pipe is connected with the other end of the auxiliary conveying pipe, and the other two ends of the three-way pipe are respectively communicated with the grinding piece and the grinding mechanism;
and the two auxiliary metering pumps are respectively arranged on the three-way pipe and the pipeline communicated with the grinding piece, the three-way pipe and the grinding mechanism.
Optionally, the cleaning mechanism comprises:
a mounting member disposed on top of the grinding member;
the cleaning plate is arranged on the mounting piece, and a mounting surface is arranged on one side, facing the striking hammer, of the cleaning plate;
and the cleaning brush is arranged on the mounting surface.
Optionally, the installed part orientation one side of driving hammer is equipped with the mounting groove, the tank bottom one end of mounting groove is equipped with adjusting screw, the cleaning plate is installed in the mounting groove, adjusting screw's one end stretch into in the mounting groove with the cleaning plate is connected.
Optionally, grind the groove and be the hemisphere, the tup part of striking hammer with grind the structure phase-match in groove, the tup part of striking hammer has the cambered surface of stepping down towards one side of direction of motion.
Compared with the prior art, the invention has the beneficial effects that:
1. the grinding mechanism is intermittently contacted with the metal powder with the granularity which is not in line with the requirement and is placed in the grinding groove, so that the metal powder is prevented from being cold-welded on the surface of the grinding mechanism in the grinding process of the grinding mechanism.
2. The cleaning mechanism is arranged on the grinding piece to conveniently clean the metal powder stuck on the grinding mechanism, so that the metal powder is prevented from being welded on a hammer head of the striking hammer due to multiple times of grinding.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view of the overall internal structure of a low temperature brittle metal powder grinding apparatus.
FIG. 2 is a schematic cross-sectional view of a low temperature brittle metal powder grinding apparatus.
FIG. 3 is a schematic view of the structure of the striking hammer of the low temperature brittle metal powder grinding device.
Fig. 4 is a schematic view of a part a of the enlarged structure in fig. 2.
Fig. 5 is a schematic view of a striking hammer having a plurality of hammers.
Fig. 6 is a schematic structural view of the striking hammer with an abdicating arc surface.
FIG. 7 is a schematic view of the low temperature brittle metal powder grinding apparatus without the first spring and the second spring.
Reference numerals:
1. a box body; 2. a box cover; 3. a grinding mechanism; 31. mounting a rod; 32. a first spring; 33. mounting a plate; 34. a second spring; 35. a fixing plate; 36. a drive mechanism; 37. striking a hammer; 371. an accommodating chamber; 372. an air intake passage; 373. an exhaust passage; 374. a abdication cambered surface; 4. a grinding member; 41. a grinding groove; 42. a temperature control cavity; 5. a liquid nitrogen temperature control mechanism; 51. a liquid nitrogen storage tank; 52. a delivery conduit; 53. a metering pump; 54. a thermometer; 55. a pressure control assembly; 551. a pressure control pipeline; 552. a pressure control valve; 553. a controller; 6. an auxiliary temperature control mechanism; 61. an auxiliary delivery pipe; 62. a three-way pipe; 63. an auxiliary metering pump; 7. a cleaning mechanism; 71. a mounting member; 711. mounting grooves; 72. cleaning the plate; 73. cleaning the brush; 8. and adjusting the screw rod.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", "axial", and the like refer to orientations or positional relationships based on those shown in the drawings, or orientations or positional relationships that are customarily used in the product of the present invention, or orientations or positional relationships that are customarily understood by those skilled in the art, merely for the purpose of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present invention provides a low temperature brittle metal powder grinding apparatus, including: the box 1, set up the case lid 2 at box 1 top, grind the inboard that mechanism 3 set up at case lid 2, after case lid 2 and box 1 sealed, grind mechanism 3 and be located box 1, two are ground 4 and all set up in box 1, and the top of grinding 4 is equipped with grinds groove 41. The grinding mechanism 3 has two grinding portions, and the two grinding portions are installed to be located in the grinding grooves 41, so that the grinding mechanism 3 can grind the metal powder in the two grinding grooves 41 at the same time. The liquid nitrogen temperature control mechanism 5 is used for controlling the integral grinding temperature in the box body 1. The auxiliary temperature control mechanism 6 is used for controlling the temperature of the grinding piece 4 and the grinding mechanism 3, and the metal powder is prevented from being welded on the grinding mechanism 3 due to heat generated by grinding. The clearance structure sets up in the export one end that grinds 4, and the metal powder who glues on grinding mechanism 3 in the grinding process clears up through clearance mechanism 7, avoids long-time grinding to glue the metal powder on grinding mechanism 3, causes the metal powder cold welding on grinding mechanism 3.
The noun explains: cold welding refers to the formation of an adhesive bond between two directly contacting surfaces at normal and low temperatures in tribology. Cold welding is a process (method) of applying mechanical, molecular, or electrical forces to spread the weld material to the surface of an appliance, typically in mechanical engineering, tribology, or wear.
Note that a feed opening is provided at the top of the box cover 2, and the metal powder to be reprocessed enters the grinding groove 41 of the grinding member 4 through the feed opening, and is reprocessed by the grinding mechanism 3 to obtain metal powder meeting the particle size requirement. The grinding member 4 is made of tungsten steel.
Set up two and grind 4, grind improvement grinding efficiency through same grinding mechanism 3. The grinding mechanism 3 intermittently grinds the metal powder in the grinding material 4.
Note that the metal powder is intermittently ground by the grinding mechanism 3, and welding of the metal powder to the surface of the grinding mechanism 3 during continuous grinding is avoided.
In another embodiment, as shown in fig. 1 and 2, the grinding mechanism 3 includes: and one end of each mounting rod 31 is fixedly connected with the box cover 2, and the other end of each mounting rod 31 faces the box bottom. The two mounting rods 31 are sequentially provided with a first spring 32, a mounting plate 33, a second spring 34 and a fixing plate 35. The first spring 32 is disposed between the cover 2 and the mounting plate 33, and the second spring 34 is disposed between the mounting plate 33 and the fixing plate 35. The drive mechanism 36 is fixedly mounted on the mounting plate 33, and the drive mechanism 36 has two output shafts respectively provided toward the two polishing members 4. The two hammers 37 are mounted on an output shaft of the drive mechanism 36, and are driven by the drive mechanism 36 to move, so that the hammers 37 perform a reprocessing process on the metal powder placed in the grinding groove 41.
The drive mechanism 36 in this embodiment is a motor having two output shafts. The arrow in fig. 2 indicates the direction of movement of the drive mechanism 36.
In another embodiment, as shown in fig. 5, the striking hammer 37 has a plurality of hammers for grinding the metal powder in the grinding tank 41 at a time in accordance with the movement of the driving mechanism 36, and the hammers are brought into contact with the cleaning mechanism 7 provided on the grinding material 4 when moving out of the grinding tank 41, thereby cleaning the metal powder adhered to the hammers.
In other embodiments, the first spring 32 and the second spring 34 may be omitted (as shown in FIG. 7).
In the present embodiment, the driving mechanism 36 is continuously operated to intermittently bring the striking hammers 37 into contact with the metal powder placed in the grinding tank 41 and intermittently grind the metal powder. When the hammer 37 is detached from the grinding groove 41, the nitrogen gas charged in the box body 1 comes into contact with the metal powder in the grinding groove 41, and absorbs the heat generated by grinding. Because the gap is arranged between the hammer head and the grinding piece 4, the metal powder is cooled by liquid nitrogen when contacting with the hammer head, and the metal powder is prevented from being welded together due to friction heat generation.
The first spring 32 and the second spring 34 protect the grinding member 4 and the striking hammer 37 during grinding. When the hammer 37 encounters the metal powder which is agglomerated during the grinding process, the metal powder is abducted by the cooperation of the first spring 32 and the second spring 34, so that the hammer 37 and the grinding member 4 are prevented from being subjected to rigid impact. The life of the grinding member 4 and the striking hammers 37 is improved.
In another embodiment, as shown in fig. 2 and 3, in order to reduce the temperature of the striking hammer 37 during use, the striking hammer 37 has a receiving cavity 371, an air inlet channel 372 and an air outlet channel 373, which are communicated with the receiving cavity 371, are provided on the side wall of the striking hammer 37 connected to the driving mechanism 36, and the air inlet channel 372 is communicated with the auxiliary temperature control mechanism 6; the exhaust channel 373 is connected to the outside of the tank 1 through an outer discharge pipe.
It should be noted that the connection between the striking hammer 37 and the auxiliary temperature control mechanism 6 is a slip ring connection, so as to avoid the pipe of the auxiliary temperature control mechanism 6 from being twisted with the output shaft of the driving mechanism 36. Charging the receiving chamber 371 with liquid nitrogen lowers the temperature of the striking hammer 37 during the polishing process.
In another embodiment, as shown in fig. 2, in order to facilitate cooling of the grinding member 4, a temperature control chamber 42 is provided in the grinding member 4, the auxiliary temperature control mechanism 6 is connected to the inside of the temperature control chamber 42, and the temperature control chamber 42 is connected to the outside of the box 1 through an auxiliary pipeline.
The grinding piece 4 generates heat by friction with the metal powder in the grinding process, one part of the heat is absorbed by liquid nitrogen in the box body, and the other part of the heat is absorbed and taken away by the liquid nitrogen in the temperature control cavity 42. So that the metal powder is always kept at a constant temperature during grinding.
In another embodiment, as shown in fig. 1 and 2, in order to facilitate temperature control of the inside of the tank 1, the liquid nitrogen temperature control mechanism 5 includes: the liquid nitrogen storage tank 51 is communicated with the box body 1 through a conveying pipeline 52; a metering pump 53 arranged on the conveying pipeline 52 and used for metering liquid nitrogen entering the box body 1; the thermometer 54 is used for detecting the temperature in the box body 1 and conveniently supplementing liquid nitrogen; the pressure control assembly 55 is used for keeping the pressure in the box body 1 when supplementing liquid nitrogen conveniently, and avoiding potential safety hazards caused by overlarge pressure in the box body 1.
More specifically, the pressure control assembly 55 includes: the pressure control pipeline 551 is installed on one side of the box body 1 and is used for communicating the inside and the outside of the box body 1; a pressure control valve 552 installed on the pressure control pipeline 551 for opening and closing the pressure control pipeline 551; the controller 553 is connected to the thermometer 54, the metering pump 53, and the pressure control valve 552. The metering pump 53 and the pressure control valve 552 are controlled to operate according to the temperature detected by the thermometer 54, so that the operating temperature in the tank 1 is always maintained in a relatively constant interval.
More specifically, a first signal output of the controller 553 is connected to a signal input of the pressure control valve 552, a second signal output of the controller 553 is connected to a signal input of the metering pump 53, and a first signal input of the controller 553 is connected to a signal output of the thermometer 54.
In another embodiment, as shown in fig. 1 and 2, in order to facilitate the individual control of the temperature of the striking hammers 37 and the temperature of the grinding member 4, the auxiliary temperature control mechanism 6 comprises: an auxiliary delivery pipe 61, a three-way pipe 62 and two auxiliary metering pumps 63, wherein one end of the auxiliary delivery pipe 61 is communicated with the liquid nitrogen storage tank 51, and the other end is communicated with the three-way pipe 62. The other end of the tee 62 is in communication with the hammer 37 and the grinding member 4, respectively. The pipe connected to the grinding members 4 is connected to an auxiliary pipe through an auxiliary three-way pipe 62, and the auxiliary pipe is connected to the two grinding members 4, respectively.
The auxiliary metering pump 63 is connected to a third signal output end of the controller 553, which facilitates timing control of the auxiliary metering pump 63.
In another embodiment, as shown in fig. 2 and 4, in order to facilitate cleaning of the metal powder on the striking hammer 37, the cleaning mechanism 7 includes: a mounting member 71, a cleaning plate 72 and a cleaning brush 73, the mounting member 71 being mounted on the grinding member 4, the cleaning plate 72 being mounted on the mounting member 71, the cleaning brush 73 being mounted on the cleaning plate 72 and being disposed toward one side of the striking hammer 37. The shape of the side of the cleaning brush 73 in contact with the striking hammer 37 matches the shape of the hammer head end of the striking hammer 37. The cleaning brush 73 is made of low temperature resistant polytetrafluoroethylene. The polytetrafluoroethylene has excellent chemical stability, corrosion resistance, sealing property, high lubrication non-stick property, electric insulation property and good ageing resistance. High temperature resistance, and the working temperature of the product can reach 250 ℃. Low temperature resistance, good mechanical toughness at low temperature, and 5 percent of elongation rate can be maintained even if the temperature is reduced to-196 ℃. Corrosion resistance, inertness to most chemicals and solvents, and resistance to strong acids, strong bases, water and various organic solvents. Good weatherability and optimal aging life in plastics. High lubrication, the lowest coefficient of friction in solid materials.
In another embodiment, as shown in fig. 4, a mounting member 71 is provided with a mounting groove 711 on a side facing the striking hammer 37, an adjusting screw 8 is provided at one end of a bottom of the mounting groove 711, the cleaning plate 72 is mounted in the mounting groove 711, and one end of the adjusting screw 8 extends into the mounting groove 711 and is connected to the cleaning plate 72.
After the cleaning brush 73 is used for a period of time, the cleaning brush 73 is worn, so that the cleaning brush 73 cannot effectively clean the metal powder on the striking hammer 37, the adjusting screw 8 is arranged at one end of the bottom of the mounting groove 711, and the distance between the cleaning brush 73 and the striking hammer 37 is adjusted through the adjusting screw 8.
In another embodiment, as shown in fig. 6, the grinding groove 41 has a hemispherical shape, the hammer head portion of the striking hammer 37 matches with the structure of the grinding groove 41, and the side of the hammer head portion of the striking hammer 37 facing the moving direction has an abdicating arc 374. In order to avoid that the striking hammers 37 during their movement lift up the metal powder scattered at the bottom of the grinding trough. The arrows in the figure point in the direction of movement of the striking hammers 37.
The chromium powder is used as an example for explanation.
The chromium powder is first cooled in liquid nitrogen for 0.5 to 1.5 hours. Then, the chromium powder is conveyed into the grinding grooves 41 through the feed inlet (the weight of the chromium powder entering each grinding groove 41 is quantitative, and the grinding time is prevented from increasing), and at the moment, the temperature in the box body 1 is controlled to be kept between-150 ℃ and-180 ℃. The starter motor drives the striking hammer 37 to move, the striking hammer 37 strikes and grinds the chromium powder in the grinding groove 41 intermittently in the motion process, partial chromium powder can be adhered to the striking hammer 37 in the striking process, the chromium powder is cleaned through the cleaning brush 73 arranged on one side of the grinding piece 4, and the chromium powder adhered to the striking hammer 37 is prevented from being welded on the surface of the striking hammer 37 by long-time striking. The temperature inside the container body 1 is detected in real time by the thermometer 54 during the grinding process, and if the temperature inside the container body 1 is higher than a preset value, the controller 553 controls the metering pump 53 and the pressure control valve 552 to operate, the metering pump 53 supplies liquid nitrogen into the container body 1, and the pressure control valve 552 controls the pressure inside the container body 1. The auxiliary temperature control mechanism is used to control the operating temperature on the grinding member 4 and the striking hammer 37.
It should be noted that other inert gases may be introduced as a protective atmosphere during the milling process. An abrasive may also be added during grinding.
The use of the abrasive can be reduced or eliminated by using the device for grinding.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A low temperature brittle metal powder grinding apparatus comprising:
a box body;
the box cover is arranged at the top of the box body;
the grinding mechanism is arranged at the bottom of the box cover;
the two grinding pieces are arranged in the box body and symmetrically arranged on the opposite sides of the grinding mechanism, and a grinding groove is formed in the top of each grinding piece;
the liquid nitrogen temperature control mechanism is communicated with the interior of the box body;
the auxiliary temperature control mechanism is communicated with the grinding mechanism and the grinding piece; and
and the two cleaning mechanisms are respectively arranged on the two grinding pieces, and the cleaning parts of the cleaning mechanisms are contacted with the grinding parts of the grinding mechanisms.
2. The low temperature brittle metal powder grinding apparatus as claimed in claim 1, wherein the grinding mechanism comprises:
one end of each mounting rod is connected with the bottom of the box cover, and the other end of each mounting rod faces the bottom of the box body and is provided with a fixing plate;
the two first springs are sleeved on the two mounting rods respectively;
the mounting plate is connected with the two mounting rods in a sliding mode, and the first spring is located between the mounting plate and the box cover;
the two second springs are sleeved on the two mounting rods respectively and are positioned between the fixed plate and the mounting plate;
the driving mechanism is arranged on the mounting plate and is provided with two output shafts, and the two output shafts face the two grinding pieces;
and the two striking hammers are respectively arranged on the two output shafts of the driving mechanism.
3. The low temperature brittle metal powder grinding device according to claim 2, characterized in that the striking hammer is provided with a containing cavity therein, the side wall of the striking hammer connected with the driving mechanism is provided with an air inlet channel and an air outlet channel communicated with the containing cavity, and the air inlet channel is communicated with the auxiliary temperature control mechanism; the exhaust channel is connected to the outside of the tank body through an outer discharge pipeline.
4. The apparatus for grinding low-temperature brittle metal powder according to claim 1, wherein the grinding member has a temperature-controlled cavity therein, the auxiliary temperature-controlled mechanism is connected to the temperature-controlled cavity, and the temperature-controlled cavity is connected to the outside of the box body through an auxiliary pipeline.
5. The apparatus for grinding low-temperature brittle metal powder according to claim 1, wherein the liquid nitrogen temperature control mechanism comprises:
the liquid nitrogen storage tank is arranged on one side of the box body;
one end of the conveying pipeline is communicated with the liquid nitrogen storage tank, and the other end of the conveying pipeline is communicated with the box body;
the metering pump is arranged on the conveying pipeline;
the detection end of the thermometer is arranged in the box body, and the display end of the thermometer is arranged on the outer side wall of the box body;
and one end of the pressure control assembly is connected into the box body, and the other end of the pressure control assembly extends out of the box body.
6. The low temperature brittle metal powder grinding apparatus as claimed in claim 5, wherein the pressure control assembly comprises:
one end of the pressure control pipeline is connected into the box body, and the other end of the pressure control pipeline is connected to the outer side of the box body;
the pressure control valve is arranged on the pressure control pipeline;
and a first signal output end of the controller is connected with a signal input end of the pressure control valve, a second signal output end of the controller is connected with a signal input end of the metering pump, and a first signal input end of the controller is connected with a signal output end of the thermometer.
7. The apparatus according to claim 6, wherein the auxiliary temperature control mechanism comprises:
one end of the auxiliary conveying pipe is connected with the liquid nitrogen storage tank;
one end of the three-way pipe is connected with the other end of the auxiliary conveying pipe, and the other two ends of the three-way pipe are respectively communicated with the grinding piece and the grinding mechanism;
and the two auxiliary metering pumps are respectively arranged on the three-way pipe and the pipeline communicated with the grinding piece, the three-way pipe and the grinding mechanism.
8. The low temperature brittle metal powder grinding apparatus as claimed in claim 2, wherein the cleaning mechanism comprises:
a mounting member disposed on top of the grinding member;
the cleaning plate is arranged on the mounting piece, and a mounting surface is arranged on one side, facing the striking hammer, of the cleaning plate;
and the cleaning brush is arranged on the mounting surface.
9. The apparatus for grinding low-temperature brittle metal powder according to claim 8, wherein the mounting member is provided with a mounting groove at a side facing the striking hammer, an adjusting screw is provided at a bottom end of the mounting groove, the cleaning plate is mounted in the mounting groove, and an end of the adjusting screw extends into the mounting groove and is connected to the cleaning plate.
10. The grinding device for low-temperature brittle metal powder as claimed in claim 2, wherein the grinding groove is hemispherical, the hammer head part of the striking hammer is matched with the grinding groove in structure, and one side of the hammer head part of the striking hammer facing the direction of motion is provided with a yielding arc surface.
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