CN113417867A - Embedded slurry pump guard plate abrasion on-line monitoring system - Google Patents

Embedded slurry pump guard plate abrasion on-line monitoring system Download PDF

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Publication number
CN113417867A
CN113417867A CN202110687663.5A CN202110687663A CN113417867A CN 113417867 A CN113417867 A CN 113417867A CN 202110687663 A CN202110687663 A CN 202110687663A CN 113417867 A CN113417867 A CN 113417867A
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CN
China
Prior art keywords
embedded
monitoring module
guard plate
shell
slurry pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110687663.5A
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Chinese (zh)
Inventor
陈伟
郭舟
刘斐
周萍
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Jiangxi Naipu Mining Machinery Co.,Ltd.
Original Assignee
Central South University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Central South University filed Critical Central South University
Priority to CN202110687663.5A priority Critical patent/CN113417867A/en
Publication of CN113417867A publication Critical patent/CN113417867A/en
Pending legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0088Testing machines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/08Sealings
    • F04D29/086Sealings especially adapted for liquid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/40Casings; Connections of working fluid
    • F04D29/42Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/40Casings; Connections of working fluid
    • F04D29/42Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4286Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps inside lining, e.g. rubber

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

The invention relates to wear detection equipment, and particularly discloses an embedded slurry pump guard plate wear online monitoring system which comprises an embedded sensing unit (1) and a data collection unit (2), wherein the embedded sensing unit comprises an embedded detection end (11), a monitoring module (12) and a connecting wire (13), the embedded detection end penetrates through a shell (31) and is inserted into a guard plate (32) to monitor the wear loss of the guard plate, and a shell adapter (111) is arranged at the joint of the embedded detection end and the shell to be hermetically connected with the shell through the shell adapter; the monitoring module comprises an energy storage unit (121) for supplying energy to the embedded detection end; the embedded detection end is electrically connected with the monitoring module through a connecting wire so as to transmit a wear loss signal to the monitoring module, and the wear loss signal is sent to the data collection unit through the monitoring module. The embedded slurry pump guard plate abrasion on-line monitoring system is simple in structure and good in sealing performance, and can adapt to severe working environments.

Description

Embedded slurry pump guard plate abrasion on-line monitoring system
Technical Field
The invention relates to wear detection equipment, in particular to an embedded type slurry pump guard plate wear online monitoring system.
Background
The slurry pump is one of the common mineral processing and treating devices, and has the function of conveying the solid-liquid mixed slurry to the next working section for post treatment. And because the flow speed of the solid-liquid mixture in the slurry pump is high, a guard plate needs to be added to carry out wear-resistant protection on the shell of the pump shell.
The guard plate material can be an alloy casting or a wear-resistant rubber composite material according to different pump types. The degree of wear of the shroud surface is generally determined by various operating conditions, and therefore monitoring the wear condition of the shroud is critical to ensuring the safety of the pump casing and is a necessary way to make efficient use of the shroud material.
At present, in the prior art, two methods of nondestructive detection and destructive detection are generally adopted for the abrasion condition in the material, the nondestructive detection generally adopts ultrasonic detection or electromagnetic detection, but the working environment of a slurry pump is polluted greatly, so that the slurry pump is not suitable for applying precision equipment; the damaged detection generally can carry out operations such as cutting and drilling on materials, and the working pressure in the slurry pump is higher (can reach 1MPa), so the requirement of sealing and leakage prevention is difficult to realize, and the non-stop monitoring of the abrasion loss of the protective plate of the slurry pump is also difficult to realize.
In view of the above, an embedded slurry pump protecting plate wear online monitoring system is needed.
Disclosure of Invention
The embedded type slurry pump protective plate abrasion on-line monitoring system provided by the invention has the advantages of simple structure and low cost, can adapt to severe working environment, and can ensure that the joint of the embedded type slurry pump protective plate and a slurry pump has good sealing performance after assembly, thereby realizing non-stop monitoring of the abrasion loss of the protective plate of the slurry pump.
In order to achieve the above purpose, the invention provides an embedded slurry pump guard plate abrasion online monitoring system, which comprises an embedded sensing unit and a data collecting unit, wherein the embedded sensing unit comprises an embedded detection end and a monitoring module, the embedded detection end can penetrate through a shell and be inserted into a guard plate so as to monitor the abrasion loss of the guard plate, and a shell adapter is arranged at the joint of the shell, which is used for penetrating through the embedded detection end, so as to be hermetically connected with the shell through the shell adapter; the monitoring module is arranged on the outer wall of the shell and comprises an energy storage unit for supplying energy to the embedded detection end; the embedded detection end is electrically connected with the monitoring module so as to transmit a wear loss signal to the monitoring module, and the wear loss signal is sent to the data collection unit through the monitoring module.
Optionally, the shell adapter is of a threaded structure, and the shell is provided with a threaded hole matched with the shell adapter.
Preferably, a sealing member is arranged at the joint of the shell adapter and the shell.
Further preferably, the embedded detection end is electrically connected with the monitoring module through a connecting wire, and the connection part of the embedded detection end and the connecting wire is wrapped in the shell adapter.
Further preferably, a plug-in structure is arranged in the shell adapter, and the connecting wire and the embedding detection end are connected through the plug-in structure in a plug-in manner.
Further preferably, the end of the embedded detection end embedded in the guard plate is flush with the surface of the guard plate far away from the shell.
Further preferably, the embedded sensing units are provided in plurality and inserted into the guard plate at the same angle intervals.
Specifically, the monitoring module further comprises a data receiving unit, a data sending unit and a monitoring module shell, the monitoring module shell is used for containing the energy storage unit, the data receiving unit and the data sending unit, and a monitoring module mounting structure is arranged on the monitoring module shell and connected with the shell through the monitoring module mounting structure.
Optionally, the monitoring module mounting structure is a magnetic attraction structure.
Further optionally, the data collection unit includes a data receiving module, a data storage module, and a data sending module, so as to receive and store the wear amount signal sent by the embedded sensing unit, and transmit the wear amount signal to a designated terminal device via the data sending module.
According to the embedded type slurry pump guard plate abrasion on-line monitoring system, the embedded detection end is inserted into the guard plate, so that the abrasion loss of the guard plate can be monitored in real time more directly, the monitoring mode is direct, the monitoring element is simple in structure, is slightly influenced by the severe working environment of a slurry pump, is not easy to damage, is suitable for long-term and continuous monitoring, and the embedded detection end is powered by the energy storage unit, so that the problem that the embedded detection end is difficult to be powered by a wire due to the limitation of the working environment can be effectively solved; in addition, the place that is connected at embedding sense terminal and the casing of sediment stuff pump is equipped with the casing adapter, thereby can realize the leakproofness of embedding sense terminal and casing junction through the assembly connection of casing adapter and casing, so that in the course of the work of sediment stuff pump, the inside sediment thick liquid of the pump body can not ooze from the junction of embedding sense terminal and casing, thereby can realize the monitoring to backplate wearing and tearing volume under the prerequisite of guaranteeing the stable work of sediment stuff pump, do not shut down the monitoring promptly.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
FIG. 1 is a front view of an embedded slurry pump protective plate wear on-line monitoring system of the invention assembled on a slurry pump;
FIG. 2 is a schematic structural diagram of an embedded sensing unit in the embedded slurry pump guard plate abrasion on-line monitoring system of the invention;
FIG. 3 is a rear view of the embedded slurry pump protective plate wear on-line monitoring system of the present invention assembled on the slurry pump;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 5 is a schematic view of the assembly between the embedded sensing unit and the mortar pump in the embedded slurry pump guard plate abrasion on-line monitoring system of the invention;
FIG. 6 is a schematic diagram of the connection between the embedded sensing unit and the data collecting unit in the embedded slurry pump protecting plate abrasion on-line monitoring system according to the present invention;
FIG. 7 is a schematic structural diagram of a monitoring module in the embedded slurry pump protecting plate abrasion on-line monitoring system.
Description of the reference numerals
1-Embedded sensing Unit 11-Embedded detection terminal
111-housing adapter 12-monitoring module
121-energy storage unit 122-data receiving unit
123-data sending unit 124-monitoring module housing
1241-magnetic attraction structure 13-connecting line
2-data collecting Unit 31-housing
32-shield
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
As shown in fig. 1, fig. 2 and fig. 6, as an embodiment of the embedded slurry pump guard plate wear online monitoring system of the present invention, the embedded slurry pump guard plate wear online monitoring system includes an embedded sensing unit 1 and a data collecting unit 2, wherein the embedded sensing unit 1 includes an embedded detection end 11 and a monitoring module 12, the embedded detection end 11 can be inserted into a guard plate 32 through a housing 31 to monitor the wear amount of the guard plate 32, and a housing adapter 111 is disposed at a connection portion of the housing 31 for inserting the embedded detection end 11 therethrough to be hermetically connected with the housing 31 through the housing adapter 111; the monitoring module 12 is mounted on the outer wall of the shell 31, and the monitoring module 12 comprises an energy storage unit 121 for supplying energy to the embedded detection end 11; the embedded detection end 11 is electrically connected with the monitoring module 12 so as to be capable of transmitting a wear amount signal to the monitoring module 12, and the wear amount signal is sent to the data collection unit 2 via the monitoring module 12 for collection and storage.
According to the embedded slurry pump guard plate abrasion on-line monitoring system, the embedded detection end 11 is inserted into the guard plate 32, so that the abrasion loss of the guard plate 32 can be monitored in real time more directly, the monitoring mode is direct, the monitoring element is simple in structure, is slightly influenced by the severe working environment of a slurry pump, is not easy to damage, is suitable for long-term and continuous monitoring, the embedded detection end 11 is powered by the energy storage unit 121, and the problem that the embedded detection end 11 is difficult to be powered by introducing a wire from the outside due to the limitation of the working environment can be effectively solved; in addition, the position that is connected at embedding sense terminal 11 and the casing 31 of sediment stuff pump is equipped with casing adapter 111, thereby can realize the leakproofness of embedding sense terminal 11 and casing 31 junction through the assembly connection of casing adapter 111 and casing 31, so that in the course of operation of sediment stuff pump, the inside sediment thick liquid of the pump body can not ooze from the junction of embedding sense terminal 11 and casing 31, thereby can realize the monitoring to backplate wearing and tearing volume under the prerequisite of guaranteeing the stable work of sediment stuff pump, do not shut down the monitoring promptly.
Specifically, as an embodiment of the embedded slurry pump guard plate abrasion online monitoring system, the shell adapter 111 can be set to be in a threaded structure, and the shell 31 is provided with a threaded hole matched with the threaded structure of the shell adapter 111, so that the shell adapter 111 and the shell 31 can be connected in a threaded manner, and by adopting a threaded manner, on one hand, the threaded manner can enable the connection between the shell adapter and the shell to be firmer and more reliable, so that the connection part can better withstand the pressure of the interior of the pump body of the slurry pump to the exterior of the pump body, and thus the leakage is not easy to generate; on the other hand, the threaded connection mode is adopted, so that the detection end 11 can be conveniently detached and installed, and the replacement of the detection end 11 is convenient to embed. In order to further improve the sealing performance of the connection, a sealing member may be disposed at the connection between the housing adapter 111 and the housing 31, and the sealing member may be a gasket disposed at the connection between the housing adapter 111 and the outer surface of the housing; the sealing member can also select the sealing washer for use, and when the sealing member was the sealing washer, the perforation hole that is used for wearing to establish embedding sense terminal 11 on the casing 31 should set up to do not establish the helicitic texture in the part that is close to the inner wall of casing 31, and the sealing washer sets up promptly and does not establish between helicitic texture's the part and embedding sense terminal 11 on this perforation hole, and this sealing washer can be preferably U type sealing washer, and the opening is inside towards the pump body of sediment stuff pump.
As shown in fig. 2 and fig. 7, as an embodiment of the embedded slurry pump protecting plate abrasion online monitoring system of the present invention, the monitoring module 12 further includes a data receiving unit 122, a data transmitting unit 123 and a monitoring module housing 124, the monitoring module housing 124 is configured to accommodate the energy storage unit 121, the data receiving unit 122 and the data transmitting unit 123 to perform a sealing protection function, and the monitoring module 12 is electrically connected to the embedded detection terminal 11 through the connection line 13, specifically, one end of the connection line 13 is connected to the embedded detection terminal 11, and the other end is connected to the energy storage unit 121 and the data receiving unit 122, so as to supply power to the embedded detection terminal 11 by using the energy storage unit 121 and receive an abrasion amount signal sent by the embedded detection terminal 11 by using the data receiving unit 122, the energy storage unit 121 can be configured as a battery, and the energy supply to the embedded detection terminal 11 by using the battery can enable the energy supply device to be miniaturized, thereby facilitating the arrangement of the embedded sensing unit 1 and the energy storage unit 121 is sealed in the monitoring module housing 124, which enables more reliable energy supply.
The connection part of the embedded detection end 11 and the connection line 13 can be arranged to be wrapped in the shell adapter 111 to prevent the situation that the connection part is polluted to cause unstable connection and failure, particularly, the shell adapter 111 is provided with an inserting structure, the connection line 13 and the embedded detection end 11 are inserted and connected through the inserting structure, the inserting structure can realize quick butt joint between the connection line 13 and the embedded detection end 11, and the embedded detection end 11 or the monitoring module 12 can be conveniently and independently replaced; in addition, be equipped with monitoring module mounting structure on the monitoring module shell 124, in order to be connected with casing 31 through this monitoring module mounting structure, this monitoring module mounting structure can be the joint structure, in order to be connected with the corresponding joint cooperation structure that casing 31 set up, thereby realize being connected of monitoring module 12 and casing 31, because the casing 31 of slurry pump is iron usually, therefore, monitoring module mounting structure preferably magnetism inhale structure 1241, in order to realize being connected of monitoring module 12 and casing 31 through the mode of magnetism, so that the installation and the dismantlement of monitoring module 12, it needs to be noted that, magnetism inhale structure 1241 should preferably be the permanent magnet, neodymium magnet for example, and magnetism inhale structure 1241 and should wrap up in monitoring module shell 124, in order to prevent the pollution.
Further, as shown in fig. 1 and fig. 3, as an embodiment of the embedded slurry pump protecting plate abrasion online monitoring system of the present invention, a plurality of embedded sensing units 1 are preferably provided, and are inserted into the protecting plate 32 at the same interval angle, for example, four embedded sensing units 1 are provided, and are distributed on the protecting plate 32 at an interval angle of 90 ° so as to be able to detect the abrasion condition of each part of the protecting plate 32 in more detail, it can be understood that the number of the embedded sensing units 1 can be determined according to the size of the protecting plate 32, that is, the larger the protecting plate 32 is, the more embedded sensing units 1 need to be arranged; the specific arrangement form of the embedded detection end 11 can be as shown in fig. 4 and 5, that is, the end of the end, embedded in the guard plate 32, of the embedded detection end 11 is flush with the surface, away from the housing 31, of the guard plate 32, so that the embedded detection end 11 can directly and accurately measure the abrasion loss of the guard plate 32, and thus, whether the slurry pump needs to be maintained or replaced can be determined according to the value of the abrasion loss; or, one end of the embedded detection end 11 embedded in the guard plate 32 is set to be wrapped in the guard plate 32, and the distance from the end of the embedded detection end 11 to the inner surface (the surface contacted with the slurry) of the guard plate 32 is set to be consistent with the maximum allowable abrasion loss of the guard plate 32, so that when the embedded detection end 11 detects the slurry, relevant personnel can be reminded to maintain and replace the slurry pump.
Further, as shown in fig. 6, as an embodiment of the embedded slurry pump protecting plate abrasion on-line monitoring system of the present invention, since the embedded sensing units 1 in the embedded slurry pump protecting plate abrasion on-line monitoring system of the present invention are usually provided in plurality, data of a plurality of embedded sensing units 1 can be collected and processed in a centralized manner to facilitate archiving and retrieving of data information, therefore, the data collecting unit 2 needs to include a data receiving module, a data storage module and a data sending module to receive and store the abrasion loss signal sent by the embedded sensing unit 1, specifically, the abrasion loss signal sent by the embedded detecting terminal 11 is transmitted to the data receiving unit 122 in the monitoring module 12 through the connecting line 13, and then the abrasion loss signal in the data receiving unit 122 is sent to the data receiving module in the data collecting unit 2 through the data sending unit 123, the data receiving module receives the wearing and tearing volume information and then transmits the wearing and tearing volume information to the data storage module for temporary storage, and can transfer the looks wearing and tearing volume information and transmit to appointed terminal equipment through the data sending module, and the terminal equipment can be a display screen, so that the wearing and tearing volume of the backplate 32 can be conveniently read in real time, or a cloud server, so that the wearing and tearing volume data can be conveniently stored and put on records.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.

Claims (10)

1. The embedded type slurry pump guard plate abrasion online monitoring system is characterized by comprising an embedded type sensing unit (1) and a data collecting unit (2), wherein the embedded type sensing unit (1) comprises an embedded detection end (11) and a monitoring module (12), the embedded detection end (11) can penetrate through a shell (31) to be inserted into a guard plate (32) so as to monitor the abrasion loss of the guard plate (32), and a shell adapter (111) is arranged at the joint of the shell (31) for penetrating through the embedded detection end (11) so as to be connected with the shell (31) in a sealing manner through the shell adapter (111); the monitoring module (12) is mounted on the outer wall of the shell (31), and the monitoring module (12) comprises an energy storage unit (121) for supplying energy to the embedded detection end (11); the embedded detection end (11) is electrically connected with the monitoring module (12) so as to be capable of transmitting a wear amount signal to the monitoring module (12), and the wear amount signal is sent to the data collection unit (2) through the monitoring module (12).
2. The embedded slurry pump guard plate abrasion online monitoring system according to claim 1, wherein the shell adapter (111) is of a threaded structure, and a threaded hole matched with the shell adapter (111) is formed in the shell (31).
3. The embedded slurry pump backplate wear online monitoring system of claim 2, wherein a seal is provided at the connection of the housing adapter (111) and the housing (31).
4. The embedded slurry pump guard plate abrasion online monitoring system according to claim 3, wherein the embedded detection end (11) is electrically connected with the monitoring module (12) through a connecting wire (13), and the connecting part of the embedded detection end (11) and the connecting wire (13) is wrapped in the shell adapter (111).
5. The embedded slurry pump guard plate abrasion online monitoring system according to claim 4, wherein a plug-in structure is arranged in the shell adapter (111), and the connecting wire (13) and the embedded detection end (11) are connected through the plug-in structure in a plug-in manner.
6. The embedded slurry pump cover plate wear online monitoring system according to claim 1, wherein the end of the embedded detection end (11) embedded in the cover plate (32) is flush with the surface of the cover plate (32) away from the housing (31).
7. The embedded slurry pump guard plate abrasion online monitoring system according to claim 6, characterized in that the embedded sensing units (1) are provided in plurality and inserted into the guard plate (32) at the same interval angle.
8. The embedded slurry pump guard plate abrasion online monitoring system according to claim 7, wherein the monitoring module (12) further comprises a data receiving unit (122), a data transmitting unit (123) and a monitoring module housing (124), the monitoring module housing (124) is used for accommodating the energy storage unit (121), the data receiving unit (122) and the data transmitting unit (123), and a monitoring module mounting structure is arranged on the monitoring module housing (124) so as to be connected with the shell (31) through the monitoring module mounting structure.
9. The embedded slurry pump guard plate wear online monitoring system of claim 7, wherein the monitoring module mounting structure is a magnetic attraction structure (1241).
10. The embedded slurry pump guard plate abrasion on-line monitoring system according to any one of claims 1 to 9, wherein the data collection unit (2) comprises a data receiving module, a data storage module and a data sending module, so as to receive and store the abrasion loss signal sent by the embedded sensing unit (1) and transmit the abrasion loss signal to a specified terminal device via the data sending module.
CN202110687663.5A 2021-06-21 2021-06-21 Embedded slurry pump guard plate abrasion on-line monitoring system Pending CN113417867A (en)

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CN202110687663.5A CN113417867A (en) 2021-06-21 2021-06-21 Embedded slurry pump guard plate abrasion on-line monitoring system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115045844A (en) * 2022-04-07 2022-09-13 山东省章丘鼓风机股份有限公司 Take sediment stuff pump of intelligent wearing and tearing monitoring warning

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Publication number Priority date Publication date Assignee Title
CN205157799U (en) * 2015-12-08 2016-04-13 潘熊炜 Survey stifled utensils detachable test probe
CN105466327A (en) * 2015-12-31 2016-04-06 中国铁建重工集团有限公司 Sensor for wear detection on shield machine cutter, device and cutter system
US20180333727A1 (en) * 2017-05-17 2018-11-22 Southern Cross Trading 5 (Pty) Ltd Wear gauge
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Publication number Priority date Publication date Assignee Title
CN115045844A (en) * 2022-04-07 2022-09-13 山东省章丘鼓风机股份有限公司 Take sediment stuff pump of intelligent wearing and tearing monitoring warning

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Inventor after: Pan Qing

Inventor after: Chen Wei

Inventor after: Zheng Hao

Inventor after: Meng Qingxia

Inventor after: Zhou Ping

Inventor after: Guo Zhou

Inventor after: Liu Fei

Inventor before: Chen Wei

Inventor before: Guo Zhou

Inventor before: Liu Fei

Inventor before: Zhou Ping

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RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20210921