CN114739857A - Automatic thermal weightlessness detection device - Google Patents
Automatic thermal weightlessness detection device Download PDFInfo
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- CN114739857A CN114739857A CN202210433785.6A CN202210433785A CN114739857A CN 114739857 A CN114739857 A CN 114739857A CN 202210433785 A CN202210433785 A CN 202210433785A CN 114739857 A CN114739857 A CN 114739857A
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- 238000001514 detection method Methods 0.000 title claims abstract description 40
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 230000004580 weight loss Effects 0.000 claims description 26
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- 210000002421 cell wall Anatomy 0.000 claims 2
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000010881 fly ash Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/04—Crucibles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L9/00—Supporting devices; Holding devices
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- Crucibles And Fluidized-Bed Furnaces (AREA)
Abstract
The invention provides a thermal weightlessness automatic detection device, which is characterized by comprising: the crucible comprises a crucible cover and a crucible seat, and two sides of the cover body of the crucible cover outwards protrude two limiting bulges; the crucible base is used for containing a sample to be detected, and the upper part of the crucible base is provided with at least two similar G-shaped sliding grooves matched with the limiting bulges; a crucible connection piece, comprising: the crucible cover comprises a connecting seat detachably connected with the crucible cover, a hollow rod sleeve connected with the connecting seat, a mounting hole formed in the rod sleeve, and upper and lower contact switches arranged on the upper and lower sides of the mounting hole; a telescopic drive comprising: the connecting rod and the elastic part extend into the rod sleeve, and the electric telescopic rod is connected with the front end of the connecting rod at the driving end and drives the connecting rod to move up and down through the telescopic motion of the driving end; the rotating piece is connected with the telescopic driving piece; and the side pressure sensor is connected with the connecting rod and extends into the mounting hole to be positioned between the upper contact switch and the lower contact switch, the left side and the right side are used for monitoring pressure values, and the upper side and the lower side are respectively correspondingly matched with the upper contact switch and the lower contact switch.
Description
Technical Field
The invention belongs to the technical field of analysis and test devices, and particularly relates to a thermal weight loss automatic detection device.
Background
The operation of heating the solid material to a high temperature for the purpose of dehydrating, decomposing or removing volatile impurities, burning off organic substances, etc. is called burning. In experiments and analysis tests, a sample is often required to be placed in a furnace body at a certain temperature for burning, so that the sample is treated to remove certain specific components or substances.
In the burning process under different temperatures and different conditions, the weight loss condition of the sample directly reflects the material composition of the sample, and the crucible for burning is an extremely important analysis and test device, so that on one hand, the function of holding the sample needs to be undertaken, and the crucible can endure high temperature, and on the other hand, the whole crucible needs to be weighed after burning to obtain important component content information.
The existing crucible is easy to cause sample splashing in the rapid heating process, and the accuracy of obtaining the component content by subsequent weighing is influenced. Moreover, at present, the crucible is still moved by manual clamping, which results in slow detection, large error and significant influence of manual operation on result repeatability.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide an automated thermal weightlessness detection device capable of efficiently and stably performing ignition detection and improving accuracy of ignition detection data.
In order to achieve the purpose, the invention adopts the following scheme:
the invention provides a thermal weightlessness automatic detection device, which is characterized by comprising: the crucible comprises a crucible cover and a crucible base, wherein the crucible cover comprises a cover body and two limiting bulges which protrude outwards from two sides of the cover body; the crucible base is used for containing a sample to be measured, the upper part of the crucible base is matched with the crucible cover, and the upper part of the crucible base is provided with at least two similar G-shaped sliding grooves matched with the limiting bulges; the type G spout includes: the limiting bulge enters the entering section of the groove bottom, enters one end of the groove top from bottom to top, moves from one end of the groove top to the other end and is limited, so that the crucible cover is lifted to be higher than the upper edge of the crucible seat by a certain distance to form a limiting lifting section of an air flow channel; a crucible connecting member for detachably connecting a crucible cover, comprising: the crucible cover comprises a connecting seat detachably connected with the crucible cover, a hollow rod sleeve connected with the connecting seat, a mounting hole formed in the rod sleeve, and upper and lower contact switches arranged on the upper and lower sides of the mounting hole; a telescopic drive comprising: the electric telescopic rod comprises a connecting rod extending into a rod sleeve, an elastic piece arranged at the front end of the connecting rod and elastically abutted to the bottom of a hollow groove of the rod sleeve, and an electric telescopic rod of which the driving end is connected with the front end of the connecting rod and drives the connecting rod to move up and down through the telescopic motion of the driving end; the rotating piece is connected with the telescopic driving piece, and drives the crucible connecting piece through the telescopic driving piece so as to drive the crucible cover to rotate clockwise and anticlockwise; and the side pressure sensor is connected with the connecting rod, extends into the mounting hole, is positioned between the upper contact switch and the lower contact switch, can move back and forth between the upper contact switch and the lower contact switch along with the up-down movement of the connecting rod, the left side and the right side are used for monitoring pressure values, and the upper side and the lower side are respectively correspondingly matched with the upper contact switch and the lower contact switch.
The beneficial effect of above scheme does:
the automatic thermal weightlessness detection device provided by the invention has the structure, so that after being connected with the controller, the automatic control crucible movement, covering and combustion preparation operations can be realized by controlling the crucible connecting piece, the telescopic driving piece, the rotating piece and the side pressure sensor, and the automatic thermal weightlessness detection device specifically comprises the following components: when the inlet section of the G-type chute is positioned at the right side (viewed from the front of the chute or viewed from the counterclockwise direction), after the crucible connecting piece is connected with the crucible base, the limiting bulge can be determined to be pressed on the crucible at the moment according to a lower contact signal (when the side sensor is contacted with the lower contact switch, the electric telescopic rod stops to continue to extend, but the current extending amount is kept unchanged) of the contact between the side sensor and the lower contact switch, then the rotating piece rotates counterclockwise until the side sensor detects that the right side pressure is greater than a rotation threshold value and the side sensor is not contacted with the lower contact switch, and according to a lower non-contact signal (or no actual received signal, the condition that the lower or upper contact signal is not received is taken as a 'lower non-contact signal' or 'upper non-contact signal') and a right side pressure over-threshold signal (greater than the rotation threshold value, the rotating piece stops to continue to rotate, but the current rotation angle is still kept unchanged), the limit bulge is determined to find the entrance of the entering section at the moment, the electric telescopic rod is continuously extended until the side sensor is contacted with the lower contact switch, the limit bulge of the crucible cover is determined to be sent downwards to the bottom of the G-shaped sliding chute along the entering section according to the lower contact signal and the right side pressure over-threshold signal, the crucible is in a closed state (the crucible cover is contacted with the upper edge of the crucible seat), then the rotating member is reversely rotated clockwise until the side sensor monitors that the left side pressure is greater than the rotation threshold value, the limit bulge is judged to reach the entrance of the limit lifting section according to the lower contact signal and the left side pressure over-threshold signal, the electric telescopic rod is controlled to retract until the side sensor is contacted with the upper contact switch (when the electric telescopic rod is contacted with the upper contact switch, the electric telescopic rod stops continuously retracting, but the current extension amount is kept unchanged), then the rotating piece rotates anticlockwise again until the side sensor monitors that the side pressure is greater than the rotating threshold value, the limit protrusion is judged to be limited and lifted according to the upper contact signal and the right side pressure exceeding threshold value signal, at the moment, the crucible cover is higher than the upper edge of the crucible base by a certain distance, and a circle of gas flow channel is formed between the crucible cover and the inner wall of the crucible base, so that external combustion-supporting gas can fully flow in, and ignition gas can flow out from the gas flow channel, and full ignition is realized; on the other hand, the flying of the sample can be avoided, and the fly ash carried by the burning gas can be blocked by the crucible cover above the fly ash in the upward escape process of the fly ash, so that the precision of sample mass weighing is further ensured, and the accuracy of the detection result is ensured.
In particular, the arrangement of the rod sleeve, the upper contact switch, the lower contact switch and the side pressure sensor not only realizes structural connection, but also provides reliable pressure and contact condition signals which can be used as a basis for the extension and retraction of the electric telescopic rod and the rotation direction of the rotating part, and provides accurate relative position information in the extension (push-down) and retraction (push-up) directions of the push rod. Through the monitoring of upper and lower touch switch and side pressure sensor state signal, can judge crucible cover and crucible's relative position relation and current state in real time to effectively avoided because of crucible manufacturing difference or push rod, the actuating mechanism running error that the piece execution lost the step and caused, more adaptability and reliability for the scheme of coming control through the absolute quantity, also relatively lower to the requirement of equipment, make the firing detect can high-efficient, go on steadily, and avoid artificial interference, improve the accuracy of firing detection data conscientiously.
And the elastic piece arranged at the bottom end of the connecting rod can keep the relative position of the connecting rod and the rod sleeve to be elastically changed within a certain range, so that the crucible cover and the crucible base are kept in elastic contact in the relative movement process, and the damage is avoided.
Preferably, the automated thermal weight loss detection apparatus according to the present invention may further include: the judgment control part is in communication connection with the crucible connecting piece, the telescopic driving piece, the rotating piece and the side pressure sensor to control the operation of the crucible connecting piece, the telescopic driving piece, the rotating piece and the side pressure sensor; when the entering section in the G-like chute is positioned on the right side, after the crucible connecting piece is connected with the crucible base, when the electric telescopic rod is in an extending state and the side sensor is in contact with the lower contact switch, the limiting bulge is judged to be pressed on the crucible base at the moment, the rotating piece is controlled to rotate anticlockwise until the side sensor monitors that the side pressure is greater than the rotating threshold value and the side sensor is not in contact with the lower contact switch, the limiting bulge is judged to find the inlet of the entering section at the moment, the electric telescopic rod is controlled to continue to extend until the side sensor is in contact with the lower contact switch, the limiting bulge of the crucible cover is judged to be sent to the bottom of the G-like chute downwards along the entering section, and the crucible is in a closed state at the moment; when the side sensor is in contact with the lower contact switch and the side sensor monitors that the right side pressure is greater than a rotation threshold value, the rotating part is controlled to rotate clockwise in a reverse direction until the left side sensor monitors that the side pressure is greater than the rotation threshold value, the limiting bulge reaches the inlet of the limiting lifting section at the moment, the electric telescopic rod is controlled to retract until the side sensor is in contact with the upper contact switch, then the rotating part is controlled to rotate anticlockwise again in the reverse direction until the side sensor monitors that the side pressure is greater than the rotation threshold value, the limiting bulge is judged to be lifted in a limiting manner, and at the moment, the crucible is in a lifting state and a burning in-place state; on the contrary, when the entering section in the G-shaped sliding chute is positioned on the left side, the rotating direction is opposite; further, if the crucible needs to be moved, the electric telescopic rod can be controlled to continuously retract to drive the crucible connecting piece to lift the crucible upwards and then carry the crucible to move to a corresponding station; if the crucible needs to be combusted, the crucible connecting piece is controlled to be separated from the crucible cover after the crucible is positioned at the combustion station. The judgment control part can be used as a part of the device as described above, directly acquire the structure operation information and control each structure, and can conveniently perform information acquisition and structure control operation after being set by the existing external signal receiving control processor.
Preferably, the automatic thermal weight loss detection apparatus according to the present invention may further include: the top end of the cover body is provided with a threaded groove, the central area of the front end of the connecting seat is provided with an arc top threaded connecting column which is matched and screwed with the threaded groove, and the center of the connecting seat is provided with the arc top threaded connecting column which can be in threaded fit with the crucible cover and can further guide the crucible cover and the arc top threaded column to be quickly aligned; the peripheral side of the front end of the connecting seat is provided with a circle of knurls, so that resistance and skid resistance are increased during manual adjustment under special conditions.
Preferably, the automatic thermal weight loss detection apparatus according to the present invention may further include: the lid top is equipped with the bellied cylindric boss that makes progress, and this boss middle part is interior concave and is formed the screw thread recess, and the front end middle part region of connecting seat is equipped with: the arc-top threaded connecting column is screwed with the threaded groove in a matched mode, the inner recess, the groove wall and the arc-top threaded connecting column are spaced at a certain distance, and a first guide groove is formed around the arc-top threaded connecting column, and a second guide groove is formed by expanding the inner diameter of the outer groove wall of the first guide groove to the periphery and downwards to be gradually increased to be flush with the peripheral edge of the front end of the connecting seat. The first guide groove and the second guide groove can guide the crucible cover to slide into the center of the connecting seat when the connecting seat is not matched with the crucible cover in place, and the center is provided with an arc top thread connecting column which can be in thread fit with the crucible cover and can further guide the crucible cover to be quickly aligned with the arc top thread column.
Preferably, the automatic thermal weight loss detection apparatus according to the present invention may further include: the material of the contact area of the connecting seat and the crucible cover is polytetrafluoroethylene, so that the flexible connection of a certain degree is realized, and the collision and abrasion between the crucible and the connecting seat are avoided.
Preferably, the automatic thermal weight loss detection apparatus according to the present invention may further include: an electromagnetic positioner which is used for weighing the crucible, burning in the furnace, cleaning and accommodating each station for electromagnetic positioning is arranged in the connecting seat. Through such setting for the connecting seat can carry out quick counterpoint with the station that is provided with (can be on the station or near the station) corresponding electromagnetic positioner and fix, for subsequent operation.
Preferably, the automatic thermal weight loss detection apparatus according to the present invention may further include: the side pressure sensor transversely penetrates through the connecting rod and is fixedly connected with the connecting rod; the side pressure sensor transversely penetrates through two side walls of the rod sleeve through the mounting hole, and the vertical extension length of the mounting hole is greater than the section length of the side pressure sensor in the mounting hole when viewed along the axial direction of the rod sleeve; the upper and lower contact switches are arranged in two groups, symmetrically arranged on two side walls of the rod sleeve penetrated, and the upper and lower contact switches of each group are positioned at the upper and lower edge parts of the mounting hole. Contact switch and lower contact switch are all established to logical groove left and right sides, and certain side contact switch trouble when can avoiding long-time continuous use.
Preferably, the automatic thermal weight loss detection apparatus according to the present invention may further include: the cross section of the rod sleeve is hollow and round, the outer surface of the rod sleeve is oblong, namely, the two ends of the rod sleeve are semicircular and rectangular in the middle, correspondingly, the mounting hole is oblong in the axial direction, and the side pressure sensor stably moves along the mounting hole.
Preferably, the automatic thermal weight loss detection apparatus according to the present invention may further include: the crucible cover comprises three limiting bulges, the three limiting bulges are uniformly arranged on the side surface of the cover body, and the three limiting bulges are connected to form an equilateral triangle; at least three G-shaped sliding grooves matched with the limiting bulges are arranged on the upper part of the crucible base. The arrangement ensures that the crucible cover and the crucible base are connected and then are more stable in the moving and burning processes.
Preferably, the automatic thermal weight loss detection apparatus according to the present invention may further include: the perpendicular distance that the tank bottom of type G spout and the regional lower surface of adjacent lid or the spacing section of raising is 1/20 ~ 1/30 of crucible seat internal height, and the lower one of lower surface forms the auxiliary air flow channel in the tank bottom of type G spout and the regional or spacing section of raising of adjacent lid in both, can be when avoiding the sample to splash and flee, makes inside and outside air current circulate more smoothly, makes the combustion process go on fast steadily more.
Preferably, the automatic thermal weight loss detection device according to the present invention may further include: the horizontal distance between the outer wall of the cover body and the inner wall of the G-like sliding groove is 1-3 mm, so that a sample splashed in the crucible base can be prevented by the cover pot cover.
Drawings
Fig. 1 is a schematic structural diagram of an automatic thermal weight loss detection device according to an embodiment of the present invention;
fig. 2 is a first exploded view of an automatic thermal weight loss detection apparatus according to an embodiment of the present invention;
fig. 3 is a second exploded view of the thermal weight loss automatic detection device according to the embodiment of the present invention;
FIG. 4 is a schematic view of a crucible according to an embodiment of the present invention;
FIG. 5 is a schematic view showing the structure of a crucible cover according to an embodiment of the present invention;
FIG. 6 is a schematic structural view of a crucible holder according to an embodiment of the present invention;
FIG. 7 is a schematic view of a crucible cover according to an embodiment of the present invention in a raised state after being engaged with a crucible base;
FIG. 8 is a first schematic structural view of a crucible connection member and a side sensor according to an embodiment of the present invention;
FIG. 9 is a second schematic structural view of a crucible connection member and a side sensor according to an embodiment of the present invention;
FIG. 10 is a third schematic structural view of a crucible connection member and a side sensor according to an embodiment of the present invention;
FIG. 11 is a schematic view showing a structure of a crucible connecting member according to an embodiment of the present invention after being connected to a crucible;
FIG. 12 is a side view of a crucible connection member according to an embodiment of the present invention;
FIG. 13 is a schematic structural view of a telescoping drive member according to an embodiment of the present invention;
FIG. 14 is a schematic view of a rotary member according to an embodiment of the present invention;
fig. 15 is a schematic diagram showing the corresponding relationship between the side sensor and the mounting hole and the upper and lower contact switches according to the embodiment of the present invention, in which (a) the side sensor is in contact with the upper contact switch and (b) the side sensor is in contact with the lower contact switch;
fig. 16 is a schematic diagram of an operation process according to an embodiment of the present invention.
Detailed Description
The automatic thermal weight loss detection device according to the present invention will be described in detail with reference to the accompanying drawings.
< example >
As shown in fig. 1 to 3, the thermal weight loss automatic detection device 10 includes a crucible 20, a crucible connection member 30, a telescopic driving member 40, a rotating member 50, and a side pressure sensor 60.
As shown in FIGS. 4 to 6, the crucible 20 includes a crucible cover 21 and a crucible holder 22.
The crucible cover 21 includes a cover body 21a and two positioning pins 21b (stopper projections). The cover body 21a includes an upper cover portion 21a-1, a lower cover portion 21a-2, and a small cylindrical boss 21 a-3. The upper lid 21a-1 is disk-shaped and has an outer diameter larger than the outer diameter of the opening of the crucible holder 22, and the position of the crucible lid 21 can be restricted. The lower lid portion 21a-2 is provided on the lower side of the upper lid portion 21a-1, has a smaller outer diameter than the upper lid portion 21a-1, is cylindrical, and has a lower portion matching the inner wall of the crucible holder 22. The small cylindrical boss 21a-3 is arranged on the upper cover part 21a-1 and is a cylindrical boss, the middle part of the boss is concave inwards and is tapped to form a thread groove, and the thread groove can be connected with the crucible connecting piece 30 through threads. Two positioning pins 21b are provided on both sides of the middle portion of the lower cover portion 21 a-2.
As shown in FIGS. 4, 7 and 8, the crucible base 22 is fitted with the crucible cover 21 at the upper part and is used for holding a sample to be burned therein. In this embodiment, the cross section of the crucible base 22 is regular hexagon, the inside is cylindrical, and six G-like chutes 22a matched with the positioning pins 21b are arranged on the upper portion of the crucible base 22 and symmetrically arranged on each side. The G-like chute 22a includes an entry section 22a-1 and a limit elevation section 22 a-2. The entry section 22a-1 allows the locating pin 21b to enter the groove bottom. The spacing and elevating section 22a-2 enables the positioning pin 21b to enter one end of the top of the tank from the bottom of the tank from bottom to top, and then move from one end of the top of the tank to the other end to be spacing, so that the crucible cover 21 is elevated to be higher than the upper edge of the crucible base 22 by a certain distance (as shown in fig. 8) to form a gas flow channel.
In this embodiment, the entry section 22a-1 includes a bottom slot wall 22a-1a and a lead-in wall 22a-1 b. The positive elevation section 22a-2 includes one side slot wall 22a-2a, a top slot wall 22a-2b, another side slot wall 22a-2c, and a lateral elevation plate 22a-2 d. The bottom side groove wall 22a-1a, the top groove wall 22a-2b and the transverse lifting plate 22a-2d are all transversely arranged, and one side groove wall 22a-2a, the other side groove wall 22a-2c and the leading-in wall 22a-1b are all longitudinally arranged. Moreover, the bottom side groove wall 22a-1a is lower than the transverse lifting plate 22a-2d, and the distance between the two can allow the positioning pin 21b to enter; the inner end of the bottom side groove wall 22a-1a is connected with the side groove wall 22a-2 a; the lead-in wall 22a-1b and the other side groove wall 22a-2c are spaced at a distance which allows the positioning pin 21b to enter, and the two walls together form a guide groove for guiding the positioning pin 21 b. The transverse lifting plates 22a-2d are connected with the other side groove wall 22a-2c and enclose a limiting structure of the positioning pin 21b together with the top groove wall 22a-2b, and the crucible cover 21 is stably connected with the crucible base 22 through the positioning pin 21b, so that not only is an airflow channel for burning formed, but also the crucible base 22 can be moved to different stations along with the crucible cover 21.
In the embodiment, the vertical distances between the bottom of the G-like chute 22a and the lower surface or the limiting and raising section of the adjacent cover 21a are 1/20-1/30 of the internal height of the crucible base, and the horizontal distance between the outer wall of the cover 21a and the inner wall of the G-like chute 22a is 1-3 mm.
The direction of the entry sections 22a-1 of all the G-like chutes 22a is the same, i.e., the entry sections 22a-1 are located on the right side of the G-like chute 22a or on the left side of the G-like chute 22a when viewed in the counterclockwise direction (or from the front of each G-like chute 22 a), and in the present embodiment, the entry sections 22a-1 are located on the right side of the G-like chute 22 a.
A circle of limiting support ring 22b is arranged on the lower edge of the upper part of the crucible seat 22.
As shown in fig. 8 to 12, the crucible connecting member 30 is used for detachably connecting the crucible cover 21, and includes a connecting base 31, a rod sleeve 32, two mounting holes 33, two upper contact switches 34, and two lower contact switches 35.
The connection holder 31 is detachably connected to the crucible cover 21. The front middle region of the connecting seat 31 is provided with a screw coupling post 31a, a first guide groove 31b and a second guide groove 31c in sequence from the center to the outside. The arc top thread connecting column 31a is matched with the thread groove on the small cylindrical boss 21 a-3. The first guide groove 31b is recessed around the curved-topped threaded connection post 31a, and the groove wall is spaced a certain distance from the curved-topped threaded connection post 31 a. The second guide groove 31c is expanded outward and downward from the outer side wall of the first guide groove 31b, and the inner diameter is gradually increased to be flush with the outer peripheral edge of the front end of the coupling holder 31. The front end peripheral side surface of the connecting seat 31 is provided with a circle of knurl 31 d. In this embodiment, the connecting seat 31 is made of teflon.
The rod sleeve 32 is fixedly connected with the connecting seat 31, and a hollow cylindrical passage is formed inside. The rod sleeve 32 has a hollow circular inner surface and an oval outer surface, the outer surface of the rod sleeve 32 is divided into four sides, two opposite sides are semi-circular surfaces, and the other two opposite sides are rectangular planes extending along the axial direction.
The two mounting holes 33 are symmetrically formed on two rectangular flat sides of the rod cover 32, and are oblong extending along the axial direction of the rod cover 32.
In this embodiment, two sets of upper and lower contact switches are provided, and the two sets of upper and lower contact switches are symmetrically provided on both side walls through which the rod cover 32 is penetrated. In each set, the upper contact switch 34 and the lower contact switch 35 are disposed on the upper and lower sides of the mounting hole 33, respectively.
As shown in fig. 2, 3 and 13, the telescopic driving member 40 is coupled to the crucible connecting member 30, and includes a connecting rod 41, an elastic member 42 and an electric telescopic rod 43.
The connecting rod 41 is cylindrical and can extend into the hollow cylindrical passage of the rod sleeve 32, move up and down along the rod sleeve 32 and drive the rod sleeve 32 to move up and down. The link 41 is provided with a through hole 41a having a diameter corresponding to the width of the mounting hole 33 and is smaller than the length of the mounting hole 33.
The elastic member 42 is provided at the front end of the link 41 in a compressed state, and elastically contacts with the end side of the hollow cylindrical passage of the rod cover 32, but is not fixedly connected thereto.
The driving end of the electric telescopic rod 43 is connected with the front end of the connecting rod 41, and the connecting rod 41 is driven to move up and down through the telescopic motion of the driving end.
As shown in fig. 14, the rotating member 50 is connected to the telescopic driving member 40, and drives the telescopic driving member 40 to drive the crucible connecting member 30 and thus the crucible cover 21 to perform clockwise and counterclockwise rotational movements. The middle part of the rotating part 50 is provided with an inwards concave disc 51, the inwards concave area is connected with the rear end of the electric telescopic rod 43 in a matching way, and the side part is provided with a driving motor for driving the disc 51 to rotate.
As shown in fig. 1 to 3 and 15, the side pressure sensor 60 penetrates the connecting rod 41 through the through hole 41a, and both ends of the protrusion further protrude outward from the two mounting holes 33 between the upper and lower contact switches 35, thereby connecting the crucible connecting member 30 with the telescopic driving member 40. The side pressure sensor 60 can move back and forth between the upper and lower contact switches 35 along with the up-and-down movement of the link 41, or can move up or down along with the up/down contact switches following the link 41. The left and right sides of the side pressure sensor 60 are used for monitoring the pressure value of the corresponding side, and the upper and lower sides are respectively correspondingly matched with the upper and lower contact switches to generate corresponding contact signals during contact. In this embodiment, the side pressure sensor 60 has a cylindrical shape and a diameter corresponding to the through hole 41 a. In the process of preparing the crucible 20 for burning, when the side pressure sensor 60 contacts the upper contact switch 34, a retraction stopping signal of the telescopic driving member 40 is correspondingly generated, and when the side pressure sensor 60 contacts the lower contact switch 35, a retraction stopping signal of the telescopic driving member 40 is correspondingly generated. When the side pressure sensor 60 detects that the left pressure exceeds the rotation threshold, a signal indicating that the rotation member 50 stops rotating clockwise is correspondingly generated, and when the side pressure sensor 60 detects that the right pressure exceeds the rotation threshold, a signal indicating that the rotation member 50 stops rotating counterclockwise is correspondingly generated.
Based on the above structure, the specific working process of the thermal weight loss automatic detection device 10 provided in this embodiment is as follows:
before loading, the electric telescopic rod 43 (driving end) is in a fully retracted state (a state of being ready for loading), the crucible cover 21 is connected to the connecting seat of the crucible cover 21 and is in a lifted state (as shown in fig. 12), the rod sleeve 32 is pinned and hung on the connecting rod 41 by the side pressure sensor 60 under the action of gravity, and the side pressure sensor 60 is in contact with the upper contact switch 34; after the sample enters the crucible base 22, the rotating piece 50 starts to slowly rotate anticlockwise, the driving end of the electric telescopic rod 43 extends downwards, the crucible cover 21 approaches the crucible base 22 while rotating under the action of the electric telescopic rod 43 and the rotating piece 50, and after the positioning pin 21b reaches the upper edge of the crucible base 22 (as shown in a position 1 in fig. 16), the elastic piece 42 is compressed downwards until the side pressure sensor 60 contacts the lower contact switch 34, the electric telescopic rod 43 stops extending continuously according to a lower contact signal, and the extending amount is kept unchanged; the rotation member 50 maintains the counterclockwise rotation until the side sensor 60 detects that the right side pressure is greater than the rotation threshold and the side sensor 60 is not in contact with the lower contact switch 35; based on the lower non-contact signal and the right flank pressure exceeding the threshold signal, at which point the positioning pin 21b has found the entrance to the entry section (as shown in fig. 16, position 2), the driving end of the electric telescopic rod 43 continues to extend downward until the flank sensor 60 contacts the lower contact switch 35, and at the same time the rotation of the rotating member 50 is suspended (the positioning pin 21b is still pressed against the right flank of the groove, and the right flank pressure still exceeds the threshold); according to the lower contact signal and the right flank pressure above-threshold signal, the positioning pin 21b of the crucible cover has now been fed down the entry section to the bottom of the groove of the G-type chute 22a (position 3 in fig. 16), and the crucible 20 is in the closed state (the lower surface of the outer ring region of the crucible cover 21 is in contact with the upper edge of the crucible base 22); based on the signals, the rotor 50 rotates clockwise in the reverse direction until the side sensor 60 detects that the left side pressure is greater than the rotation threshold; based on the lower contact signal and the left side pressure over-threshold signal, when the positioning pin 21b reaches the entrance of the limit elevation section (as shown in fig. 16, position 3 and fig. 4), the electric telescopic rod 43 retracts until the side sensor 60 contacts the upper contact switch 34; according to the upper contact signal and the left side pressure over-threshold signal, at this time, the positioning pin 21b has reached the top left side of the limit elevation section (as shown in fig. 16, position 5), and the rotating member 50 rotates in the counterclockwise direction again in the reverse direction until the side sensor 60 detects that the side pressure is greater than the rotation threshold; according to the upper contact signal and the right lateral pressure over-threshold signal, the positioning pin 21b is limited and raised (as shown in fig. 16, position 6), at this time, the crucible cover 21 is higher than the upper edge of the crucible base 22 by a certain distance (as shown in fig. 8), if the whole crucible 20 needs to be moved, the electric telescopic rod 43 continues to retract to drive the crucible connecting piece 30 to lift the crucible 20 upwards and carry the crucible 20 to move to a corresponding station, and meanwhile, the rotating piece 50 stops rotating; if combustion is needed, after the crucible 20 is at the combustion station, the rotating member 50 overcomes the separation threshold (larger than the rotation threshold) to continue to rotate counterclockwise, and the electric telescopic rod 43 can withdraw the connecting seat 31 from the threaded connection state with the crucible cover 21, so that the crucible 20 is separated from other structures (the crucible connecting member 30, the telescopic driving member 40, the rotating member 50 and the side pressure sensor 60), the crucible cover 21 is still kept lifted to be higher than the upper edge of the crucible seat 22 by a certain distance to form a burning in-place state of an airflow channel, during the burning process, external combustion-assisting gas flows enter from the airflow channel, smoke generated by burning is discharged from the airflow channel, sufficient burning and effective exhaust are realized, meanwhile, the crucible cover 20 above can prevent a sample from flying and fly ash carried by burning gas can also be effectively blocked by the crucible cover 21 during the upward escape process, the stable operation of the burning process and the accuracy and reliability of the burning data are ensured. The operation of connecting, moving and separating the crucible 20 after firing is completed is the same as the aforementioned process.
The above is merely an illustration of the technical solution of the present invention. The automatic thermal weight loss detection device according to the present invention is not limited to the structure described in the above embodiments, but is subject to the scope defined by the claims. Any modification, supplement or equivalent replacement by a person skilled in the art on the basis of this disclosure is within the scope of the invention as claimed in the claims.
Claims (10)
1. Automatic detection device of thermal weightlessness, its characterized in that includes:
the crucible comprises a crucible cover and a crucible base, wherein the crucible cover comprises a cover body and two limiting bulges which protrude outwards from two sides of the cover body; the crucible base is used for containing a sample to be measured, the upper part of the crucible base is matched with the crucible cover, and the upper part of the crucible base is provided with at least two similar G-shaped sliding grooves matched with the limiting bulges; the type G chute includes: the limiting bulge enters the entering section of the groove bottom, enters one end of the groove top from the groove bottom from bottom to top, moves from one end of the groove top to the other end and is limited, so that the crucible cover is lifted to be higher than the upper edge of the crucible base by a certain distance to form a limiting lifting section of an airflow channel;
a crucible connection piece, comprising: the crucible pot comprises a connecting seat detachably connected with the crucible cover, a hollow rod sleeve connected with the connecting seat, a mounting hole formed in the rod sleeve, and upper and lower contact switches arranged on the upper and lower sides of the mounting hole;
a telescopic drive comprising: the electric telescopic rod comprises a connecting rod extending into the rod sleeve, an elastic piece arranged at the front end of the connecting rod and elastically abutted to the bottom of a hollow groove of the rod sleeve, and an electric telescopic rod of which the driving end is connected with the front end of the connecting rod and drives the connecting rod to move up and down through the telescopic motion of the driving end;
the rotating piece drives the crucible cover to rotate through the crucible connecting piece; and
side pressure sensor, with the connecting rod links to each other and stretches into be in the mounting hole between the upper and lower contact switch, can be along with reciprocating of connecting rod is round trip movement between the upper and lower contact switch, and the left and right sides is used for monitoring the pressure value, upper and lower both sides respectively with upper and lower contact switch corresponds the cooperation.
2. The automatic thermal weight loss detection device according to claim 1, characterized in that:
wherein the top end of the cover body is provided with a thread groove,
the connecting seat is characterized in that an arc top thread connecting column matched and screwed with the thread groove is arranged in the center area of the front end of the connecting seat, and a circle of knurl is arranged on the peripheral side face of the front end of the connecting seat.
3. The automatic thermal weightlessness detection device according to claim 1, characterized in that:
wherein, the top end of the cover body is provided with an upward convex cylindrical boss, the middle part of the boss is concave inwards to form a thread groove,
the front end middle area of the connecting seat is provided with: with arc top screw thread spliced pole that the screw thread groove phase-match spiral shell closed, indent, cell wall with screw thread spliced pole interval certain distance, and encircle the first guide recess that arc top screw thread spliced pole formed, and follow first guide recess outside cell wall begins to expand internal diameter grow gradually to peripheral and downwards to with the second guide recess that the peripheral edge of connecting seat front end flushes mutually.
4. The automatic thermal weight loss detection device according to claim 1, characterized in that:
the material of the contact area of the crucible cover and the connecting seat is polytetrafluoroethylene.
5. The automatic thermal weight loss detection device according to claim 1, characterized in that:
wherein, be equipped with in the connecting seat and weigh, go into stove burning, clearance, accomodate each station and carry out the electromagnetic positioner of electromagnetic positioning with the crucible.
6. The automatic thermal weight loss detection device according to claim 1, characterized in that:
the side pressure sensor transversely penetrates through the connecting rod and is fixedly connected with the connecting rod; the side pressure sensor transversely penetrates through two side walls of the rod sleeve through the mounting hole, and the vertical extension length of the mounting hole is greater than the section length of the side pressure sensor in the mounting hole when viewed along the axial direction of the rod sleeve;
the upper and lower contact switches are provided with two sets, the symmetry is arranged on two side walls of the rod sleeve which is penetrated, and each set of the upper and lower contact switches are located at the upper and lower edge parts of the mounting hole.
7. The automatic thermal weight loss detection device according to claim 1, characterized in that:
the cross section of the rod sleeve is hollow and round on the inner surface and long round on the outer surface.
8. The automatic thermal weight loss detection device according to claim 1, characterized in that:
the crucible cover comprises three limiting bulges, the three limiting bulges are uniformly arranged on the side surface of the cover body, and the three limiting bulges are connected to form an equilateral triangle;
and the upper part of the crucible base is provided with at least three G-shaped sliding grooves matched with the limiting bulges.
9. The automatic thermal weightlessness detection device according to claim 1, characterized in that:
and the vertical distance between the groove bottom of the G-shaped sliding groove and the lower surface of the adjacent cover body area or the limiting and lifting section is 1/20-1/30 of the internal height of the crucible base.
10. The automatic thermal weight loss detection device according to claim 1, characterized in that:
wherein, the rotation piece is connected with the non-driving end of the telescopic driving piece.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114720318A (en) * | 2022-04-24 | 2022-07-08 | 华中科技大学 | Automatic thermal weightlessness detection device and system |
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