CN214751470U - Powder material level intermittent measurement control device - Google Patents
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- CN214751470U CN214751470U CN202121460852.0U CN202121460852U CN214751470U CN 214751470 U CN214751470 U CN 214751470U CN 202121460852 U CN202121460852 U CN 202121460852U CN 214751470 U CN214751470 U CN 214751470U
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- 238000007667 floating Methods 0.000 description 4
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Abstract
The utility model discloses a powder material level intermittent measurement control device, which is provided with a control motor, a winding wheel disc, a counting rotating wheel, a directional pulley, a gravity detection lever, a descending detection probe and an ascending detection probe; the winding wheel disc is connected with a power shaft for controlling the motor, and a rope is wound on the winding wheel disc; the rope sequentially bypasses the counting rotating wheel and the directional pulley, passes through the partition plate and extends into the bin, and the tail end of the rope is connected with a heavy hammer; one end of the gravity detection lever is connected with the directional pulley; the descending detection probe is tightly close to the upper part of the other end of the gravity detection lever and is used for stroke control of the rope; the ascending detection probe is arranged on one side of the rope and used for controlling starting and stopping of the motor. The utility model provides a because of the dust floats the suspension uncertainty of spreading over at aerial boundary point, the boundary point of the unclear material level is surveyed to conventional material level measuring instrument, leads to the inaccurate problem of level measurement.
Description
Technical Field
The utility model belongs to the technical field of the level detects, concretely relates to powder level intermittent type measurement controlling means.
Background
At present, for the level measurement of an open container, the most original and oldest method is adopted when no reliable measuring instrument is available, namely, a weight is suspended by a rope or a measuring tape and put into a storage bin for on-site measurement, and the authenticity of measured data is more accurate although the measuring method is original. For the detection equipment which needs to operate for a long time, the labor intensity of measurement is increased by utilizing manual monitoring, and the purpose of continuous online measurement and monitoring cannot be achieved.
At present, the most widely used devices for measuring the material level in China are radar material level meters, and the principle of the radar material level meter is that a radar material level meter antenna is used for sending out a microwave pulse signal to generate reflection on the surface of a material to be measured, the antenna receives the reflected microwave pulse and transmits the microwave pulse to a receiving circuit, a microprocessor processes the signal, an echo generated by the microwave pulse on the surface of the material is identified and received by a radar system, and the distance of the material level is calculated and displayed through the fed-back microwave signal. However, radar level gauges are more accurate for level measurements with well-defined line-of-bounds, such as: the material level measurement such as water level, oil level, acid-base liquid level, house height, well depth is accurate, but the boundary of dust materials such as pulverized coal, fly ash, cement, mineral powder and the like which float and diffuse in the air and are indistinct is not clear, and the material level measurement is not easy to distinguish, so that the material level measurement is inaccurate. In addition, other measurement methods exist in the prior art, such as: e + H radar guided wave level indicator; an ultrasonic level gauge; guided wave radar material level gauge of VEGA (Tianjin Tianwei).
However, both guided wave radar and ultrasonic measurement have the following problems: firstly, measuring devices of non-contact type charge level indicators have a commonality, and a sensor cannot overcome authenticity judgment brought by field environment to a measuring result, particularly cannot overcome influences of floating, adhesion and concentration of dust on a probe measuring result; secondly, the true accuracy of the material level cannot be accurately calibrated; the stacking of the bin is irregular, the height is low, the level is inclined, the measurement and the receiving of the reflected wave are influenced, the price of the existing measurement level instrument is high, and the reliability of the measurement and the detection of the floating objects cannot truly reflect the accuracy of the materials.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model provides a powder level intermittent type measurement controlling means solves because of the dust floats the suspension uncertainty of filling up in aerial boundary point, and conventional material level measuring instrument surveys the boundary point of unclear material level, leads to the inaccurate problem of level measurement.
In order to achieve the above object, the present invention provides the following technical solutions: a powder level intermittent measurement control device comprises a storage bin, wherein the top of the storage bin is connected with a partition plate, and the powder level intermittent measurement control device also comprises a control motor, a winding wheel disc, a counting rotating wheel, a directional pulley, a gravity detection lever, a descending detection probe and an ascending detection probe; the winding wheel disc is connected with a power shaft of the control motor, and a rope is wound on the winding wheel disc; the rope sequentially bypasses the counting rotating wheel and the directional pulley, penetrates through the partition plate and extends into the bin, and the tail end of the rope is connected with a heavy hammer; one end of the gravity detection lever is connected with the directional pulley; the descending detection probe is tightly close to the upper part of the other end of the gravity detection lever and is used for stroke control of the rope; the lifting detection probe is arranged on one side of the rope and used for controlling starting and stopping of the motor.
The controller is electrically connected with the control motor, the descending detection probe and the ascending detection probe through data signal lines respectively.
As a preferable scheme of the powder level intermittent measurement control device, a spring support contact is arranged inside the falling detection probe, and the spring support contact is used for controlling the on/off of a signal of the falling detection probe according to the reduction of the gravity after the heavy hammer is contacted with the surface of the object in the storage bin.
As a preferable scheme of the powder level intermittent measurement control device, the controller is provided with a gravity sensing sensor, and the gravity sensing sensor is used for identifying the surface of an object in the storage bin when the heavy hammer contacts the object.
The preferred scheme of the intermittent measurement and control device for the level of the powder body further comprises a display instrument, wherein the display instrument is electrically connected with the controller and is used for displaying the level height in the storage bin.
As a preferable scheme of the powder level intermittent measurement control device, the counting rotating wheel is connected with a detection conversion sensor, the detection conversion sensor is electrically connected with the display instrument, and the detection conversion sensor is used for converting the rotation of the counting rotating wheel into the moving distance of the rope.
As a preferable scheme of the intermittent measurement and control device for the level of the powder, the controller is provided with a logic comparison circuit, the logic comparison circuit comprises an integrated device IC1 and an integrated device IC2, and the integrated device IC1 and the integrated device IC2 adopt 555 bipolar integrated devices.
As a preferred scheme of the powder level intermittent measurement control device, the logic comparison circuit further comprises a motor descending integrated control circuit, a motor descending control loop, a motor ascending integrated control circuit and a motor ascending control loop.
As a preferred scheme of the powder level intermittent measurement control device, the logic comparison circuit further comprises a zero clearing control circuit, and the zero clearing control circuit is used for clearing the measurement display result.
As a preferred scheme of the powder level intermittent measurement control device, the lower end of the gravity detection lever is connected with a rotary supporting point.
The utility model has the advantages of as follows: the device is provided with a control motor, a winding wheel disc, a counting rotating wheel, a directional pulley, a gravity detection lever, a descending detection probe and an ascending detection probe; the winding wheel disc is connected with a power shaft for controlling the motor, and a rope is wound on the winding wheel disc; the rope sequentially bypasses the counting rotating wheel and the directional pulley, passes through the partition plate and extends into the bin, and the tail end of the rope is connected with a heavy hammer; one end of the gravity detection lever is connected with the directional pulley; the descending detection probe is tightly close to the upper part of the other end of the gravity detection lever and is used for stroke control of the rope; the ascending detection probe is arranged on one side of the rope and used for controlling starting and stopping of the motor. The utility model is not affected by the dust floating, concentration, humidity and coal bed environment, and directly touches the interface of the measured medium to carry out direct measurement, thus providing accurate material level measurement data and overcoming the defect that the influence of environmental factors is inaccurate in powder material level measurement; the automatic control mode is realized, the height of the current material level is continuously updated and displayed, the coal level operation condition of the coal bunker is mastered at any time, and an accurate and reliable basis is provided for field personnel; the system is convenient for reminding operators on duty to prepare for feeding and stopping at any time, and provides basis guarantee, so that the accidents of empty and full bins are avoided; the detection probe is automatically lifted immediately after touching the surface of an object, so that the risk of burying the probe due to material feeding or material stacking collapse is avoided; the control circuit realizes automatic zero clearing of the data before the material level detection, avoids accumulating and overlapping the last measurement result to the current data, ensures that the result measured each time is independent data and has no interference with the previous and next measured data; intermittent measurement at different time intervals can be set, measurement from one measurement in a few seconds to one measurement in tens of minutes can be set at will, the measurement can be controlled and selected at a plurality of time points, and operators can conveniently and freely select measurement data according to field requirements at any time; the measurement display result obtained by each descending is basically consistent with the ascending measurement display result in value and opposite in sign, and the purpose of automatically correcting the ascending and descending measurement detection data is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.
Fig. 1 is a schematic structural view of a powder level intermittent measurement control device provided in an embodiment of the present invention;
fig. 2 is a schematic block diagram of a circuit of the intermittent measurement and control device for the level of powder provided in the embodiment of the present invention;
fig. 3 is a circuit diagram of the intermittent measurement and control device for powder level provided in the embodiment of the present invention.
In the figure, 1, a stock bin; 2. a partition plate; 3. controlling the motor; 4. winding a wire wheel disc; 5. counting the rotating wheels; 6. a directional pulley; 7. a gravity detection lever; 8. a descent detection probe; 9. a lift detection probe; 10. a rope; 11. a weight; 12. a controller; 13. a display instrument; 14. a detection conversion sensor; 15. the support point is rotated.
Detailed Description
The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, a powder level intermittent measurement control device is provided, which comprises a storage bin 1, a partition plate 2 connected to the top of the storage bin 1, a control motor 3, a winding wheel disc 4, a counting rotating wheel 5, a directional pulley 6, a gravity detection lever 7, a descending detection probe 8 and an ascending detection probe 9; the winding wheel disc 4 is connected with a power shaft of the control motor 3, and a rope 10 is wound on the winding wheel disc 4; the rope 10 sequentially bypasses the counting rotating wheel 5 and the directional pulley 6, the rope 10 penetrates through the partition plate 2 and extends into the bin 1, and the tail end of the rope 10 is connected with a heavy hammer 11; one end of the gravity detection lever 7 is connected with the directional pulley 6, and the lower end of the gravity detection lever 7 is connected with a rotating supporting point 15; the descending detection probe 8 is abutted above the other end of the gravity detection lever 7, and the descending detection probe 8 is used for stroke control of the rope 10; the ascending detection probe 9 is arranged at one side of the rope 10, and the ascending detection probe 9 is used for controlling the starting and stopping of the motor 3.
In this embodiment, the apparatus further includes a controller 12, and the controller 12 is electrically connected to the control motor 3, the descending detection probe 8, and the ascending detection probe 9 through data signal lines, respectively. And a spring supporting contact is arranged in the descending detection probe 8 and used for controlling the on-off of a signal of the descending detection probe 8 according to the reduction of the gravity after the heavy hammer 11 contacts the surface of an object in the storage bin 1. The controller 12 is provided with a gravity sensing sensor, and the gravity sensing sensor is used for identifying the surface of the object in the bin 1 contacted by the heavy hammer 11.
In this embodiment, the system further comprises a display instrument 13, the display instrument 13 is electrically connected with the controller 12, and the display instrument 13 is used for displaying the level of the material in the storage bin 1. The counting rotating wheel 5 is connected with a detection conversion sensor 14, the detection conversion sensor 14 is electrically connected with the display instrument 13, and the detection conversion sensor 14 is used for converting the rotation of the counting rotating wheel 5 into the moving distance of the rope 10.
Specifically, the utility model discloses a working process as follows:
the measured materials are all stored in the storage bin 1, the measurement control device is fixed on a partition board 2 at the top of the storage bin 1, a heavy hammer 11 is suspended by one end of a rope 10 and used as an induction probe for detecting the material level at the front end, the other end of the rope 10 is fixed on a winding wheel disc 4 of a control motor 3, the length of the rope 10 is measured by rotating a counting rotating wheel 5 and a directional pulley 6 which are bridged by the rope 10 under the drive of the rotation of the control motor 3, and the directional pulley 6 is fixed on a gravity detection lever 7 and rotatably supported by a rotating support point 15 of the gravity detection lever 7. The descending detection probe 8 is close to the other end of the gravity detection lever 7, the descending detection probe 8 is a travel switch, and is switched on and off by means of a spring supporting contact inside, so that the gravity is relieved after the heavy hammer 11 is contacted with the surface of an object to control the on and off of a travel switch signal.
When the weight 11 rotated by the rope 10 contacts the surface of the object, the weight 11 is suspended by the rope 10, and the gravity sensor installed on the controller 12 can automatically recognize whether the weight 11 contacts the surface of the object, and when the weight 11 contacts the surface of the object, the motor 3 is automatically controlled to lift the rope 10, and when the rope reaches the specified position of the lift detection probe 9, the motor 3 is automatically controlled to stop. The counting rotating wheel 5 is provided with a detection conversion sensor 14, a data signal line is connected with a controller 12, the detection conversion sensor 14 and a display instrument 13, and finally the level height currently measured is displayed through transmission, conversion and control.
Specifically, the utility model is designed with a zero clearing control circuit, when the fixed time interval measurement time is reached, the measuring device automatically clears the last measurement display result automatically, simultaneously, the control motor 3 is started to lead the heavy hammer 11 to downwards spirally discharge the rope 10 from the specified position of the storage bin 1, and the length of the rope 10 is started to be counted and spirally discharged, when the heavy hammer 11 contacts the surface of an object, the instrument displays that the current descending measurement result is a negative value, the descending measurement display result is automatically cleared immediately, the motor 3 is controlled to automatically lift the rope 10 immediately, the ascending length of the rope 10 is counted again, when the lifting rope 10 reaches the specified position of the ascending detection probe 9, the instrument automatically stops to the next interval of the timed interval measurement, at the moment, the measurement result displayed by the display instrument 13 is also kept to be refreshed again until the next timed interval measurement time, the displayed measurement result is a positive value, the values of the descending and ascending measurement results are consistent, the values are verified mutually, and only the signs are opposite, so that the purpose of displaying the result of the level measurement is achieved by utilizing the rotary length of the rope 10.
In this embodiment, the controller 12 is configured with a logic comparison circuit, the logic comparison circuit includes an integrated device IC1 and an integrated device IC2, and the integrated device IC1 and the integrated device IC2 are 555 bipolar integrated devices. The logic comparison circuit also comprises a motor descending integrated control circuit, a motor descending control loop, a motor ascending integrated control circuit and a motor ascending control loop. The logic comparison circuit further comprises a zero clearing control circuit, and the zero clearing control circuit is used for clearing the measurement display result.
Specifically, the integrated device IC1 and the integrated device IC2 mainly comprise an R-S flip-flop, two voltage comparators a1 and a2, an NPN-type triode and three equivalent resistors, and the three resistors are coupled to the power supply UCCAfter partial pressure, 2U is respectively obtainedCC3 and UCCThe voltage of/3 is applied to the non-inverting input of comparator A1 and the inverting input of comparator A2, with the logic states as follows:
referring to fig. 2 and 3, logic circuits suitable for level control are designed according to the above logic tables, in the following notations: i represents a circuit frame, R represents a resistor, G represents a normally closed travel switch, C represents a capacitor, F represents a fuse, BG represents a triode, and GK represents a non-contact solid-state relay; the numbers following the electrical symbols distinguish between different electrical components and are conventional in the art.
The motor descending integrated control circuit is composed of circuits I1, I2, I5, I7, I10, I11, normally closed travel switches G1 and G2 and a capacitor C1; wherein the I1 comprises a homodromous input end of the comparator composed of R1, F1, C1 and R3; i2 is composed of R2, F2, C2 and R4 to form the inverting input end of the comparator; the I1 integrated device circuit of I5 compares the logical decision and outputs to I7, I7 is by R5, BG1, GK1 make up and descend the control circuit, GK1 adopts the contactless solid-state relay, has strengthened the action reliability of the apparatus, overcome the contact fatigue of the conventional relay and apt to sinter and contact the bad problem; a timing gear-shifting trigger control circuit is composed of G2, I10, I11 and a capacitor C5, wherein I10 is a 74HC4060, 14-bit binary serial frequency division counter, time frequency is adjusted by R6 and C4 in pins 9, 10 and 11 connected to an IC3 integrated device, and I11 is a multi-gear time change-over switch.
Similarly, a motor ascending integrated control circuit is formed by I3, I4, I6 and I8, a normally closed travel switch G2, a normally open travel switch G1 and a normally open travel switch C9; i3 is composed of R7, F3, C6 and R9 to form the homodromous input end of the comparator; i4 is composed of R8, F4, C7 and R10 to form the inverting input end of the comparator; the output is output to I8 after the comparison logic of an IC2 integrated circuit of I6, wherein the I8 consists of an ascending control loop consisting of R11, BG2 and GK2, and the GK2 adopts a non-contact solid-state relay. When the weight 11 touches the object surface 16, the motor is immediately stopped from descending, and the control circuit is instantly triggered to ascend, so that the weight 11 is prevented from being buried by the accumulation of the falling materials or the sudden collapse of the materials, and the weight 11 is difficult to lift. The circuit composed of C10, GK1 and GK2 controls the three states of up, down and stop of the motor 3, respectively. I9 is composed of R13, D1, R14 and D2 respectively to form an OR gate, then a clear control circuit is composed of BG3, C11 and C12, and the OR gate is sent to a clear end of the display instrument 13. The control motor 3 drives the rope 10 to rotate around the wire wheel disc 4, and simultaneously drives the wheel disc bridged on the D to rotate, pulse signals are sent to the IC12J wiring terminal of the display instrument 13, and a pulse signal is sent every millimeter of rotation, so that the length is converted into counting pulse signals which are displayed by the display instrument 13. I12, I13, I14, I15, I16 and I17 in a dotted line frame are internal components of the display instrument 13 and mainly comprise a connecting terminal I12; a pulse shaping circuit I13; an alarm setting circuit I14; the double clock can preset the reversible counter I15; BCD-latch-decode-drive circuit I16; the digital display I17, etc. the application of the present digital display circuit is mature and extensive, which does not belong to the focus of the utility model.
To sum up, the utility model is provided with a control motor 3, a winding wheel disc 4, a counting rotating wheel 5, a directional pulley 6, a gravity detection lever 7, a descending detection probe 8 and an ascending detection probe 9; the winding wheel disc 4 is connected with a power shaft of the control motor 3, and a rope 10 is wound on the winding wheel disc 4; the rope 10 sequentially bypasses the counting rotating wheel 5 and the directional pulley 6, the rope 10 penetrates through the partition plate 2 and extends into the bin 1, and the tail end of the rope 10 is connected with a heavy hammer 11; one end of the gravity detection lever 7 is connected with the directional pulley 6; the descending detection probe 8 is abutted above the other end of the gravity detection lever 7, and the descending detection probe 8 is used for stroke control of the rope 10; the ascending detection probe 9 is arranged on one side of the rope 10, the ascending detection probe 9 is used for controlling starting and stopping of the motor 3, the controller 12 is provided with a logic comparison circuit, the logic comparison circuit comprises an integrated device IC1 and an integrated device IC2, and the integrated device IC1 and the integrated device IC2 are 555 bipolar integrated devices. The logic comparison circuit also comprises a motor descending integrated control circuit, a motor descending control loop, a motor ascending integrated control circuit and a motor ascending control loop. The logic comparison circuit also comprises a zero clearing control circuit, and the zero clearing control circuit is used for clearing the measurement display result. The utility model is not affected by the dust floating, concentration, humidity and coal bed environment, and directly touches the interface of the measured medium to carry out direct measurement, thus providing accurate material level measurement data and overcoming the defect that the influence of environmental factors is inaccurate in powder material level measurement; the automatic control mode is realized, the height of the current material level is continuously updated and displayed, the coal level operation condition of the coal bunker is mastered at any time, and an accurate and reliable basis is provided for field personnel; the system is convenient for reminding operators on duty to prepare for feeding and stopping at any time, and provides basis guarantee, so that the accidents of empty and full bins are avoided; the detection probe is automatically lifted immediately after touching the surface of an object, so that the risk of burying the probe due to material feeding or material stacking collapse is avoided; the control circuit realizes automatic zero clearing of the data before the material level detection, avoids accumulating and overlapping the last measurement result to the current data, ensures that the result measured each time is independent data and has no interference with the previous and next measured data; intermittent measurement at different time intervals can be set, measurement from one measurement in a few seconds to one measurement in tens of minutes can be set at will, the measurement can be controlled and selected at a plurality of time points, and operators can conveniently and freely select measurement data according to field requirements at any time; the measurement display result obtained by each descending is basically consistent with the ascending measurement display result in value and opposite in sign, and the purpose of automatically correcting the ascending and descending measurement detection data is achieved.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The intermittent measurement control device for the powder material level comprises a storage bin (1), wherein the top of the storage bin (1) is connected with a partition plate (2), and is characterized by further comprising a control motor (3), a winding wheel disc (4), a counting rotating wheel (5), a directional pulley (6), a gravity detection lever (7), a descending detection probe (8) and an ascending detection probe (9); the winding wheel disc (4) is connected with a power shaft of the control motor (3), and a rope (10) is wound on the winding wheel disc (4); the rope (10) sequentially bypasses the counting rotating wheel (5) and the directional pulley (6), the rope (10) penetrates through the partition plate (2) and extends into the bin (1), and the tail end of the rope (10) is connected with a heavy hammer (11); one end of the gravity detection lever (7) is connected with the directional pulley (6); the descending detection probe (8) is abutted against the other end of the gravity detection lever (7), and the descending detection probe (8) is used for stroke control of the rope (10); the ascending detection probe (9) is arranged on one side of the rope (10), and the ascending detection probe (9) is used for controlling starting and stopping of the motor (3).
2. The intermittent measurement and control device for the level of the powder body as claimed in claim 1, further comprising a controller (12), wherein the controller (12) is electrically connected with the control motor (3), the descending detection probe (8) and the ascending detection probe (9) through data signal lines respectively.
3. The intermittent powder level measurement and control device according to claim 2, wherein a spring support contact is arranged inside the descending detection probe (8), and the spring support contact is used for controlling the on/off of a signal of the descending detection probe (8) according to the reduction of the gravity after the weight (11) contacts the surface of the object in the storage bin (1).
4. The intermittent powder level measurement and control device as claimed in claim 2, wherein the controller (12) is provided with a gravity sensing sensor for identifying the contact of the weight (11) with the surface of the object in the storage bin (1).
5. The intermittent powder level measurement and control device according to claim 2, further comprising a display instrument (13), wherein the display instrument (13) is electrically connected with the controller (12), and the display instrument (13) is used for displaying the level of the material in the storage bin (1).
6. The intermittent powder level measurement and control device according to claim 5, wherein a detection conversion sensor (14) is connected to the counting rotating wheel (5), the detection conversion sensor (14) is electrically connected with the display instrument (13), and the detection conversion sensor (14) is used for converting the rotation of the counting rotating wheel (5) into the moving distance of the rope (10).
7. The intermittent measurement and control device for the level of powder as claimed in claim 2, wherein the controller (12) is configured with a logic comparison circuit, the logic comparison circuit comprises an integrated device IC1 and an integrated device IC2, and the integrated device IC1 and the integrated device IC2 are 555 bipolar integrated devices.
8. The intermittent measurement and control device for the level of powder as claimed in claim 7, wherein the logic comparison circuit further comprises a motor descending integrated control circuit, a motor descending control loop, a motor ascending integrated control circuit and a motor ascending control loop.
9. The intermittent measurement and control device for the level of the powder body as claimed in claim 8, wherein the logic comparison circuit further comprises a zero clearing control circuit, and the zero clearing control circuit is used for clearing the measurement display result.
10. The intermittent powder level measurement and control device as claimed in claim 1, wherein the lower end of the gravity detection lever (7) is connected with a rotary supporting point (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121460852.0U CN214751470U (en) | 2021-06-29 | 2021-06-29 | Powder material level intermittent measurement control device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121460852.0U CN214751470U (en) | 2021-06-29 | 2021-06-29 | Powder material level intermittent measurement control device |
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| CN214751470U true CN214751470U (en) | 2021-11-16 |
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| CN202121460852.0U Active CN214751470U (en) | 2021-06-29 | 2021-06-29 | Powder material level intermittent measurement control device |
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