CN113586930A - Single-wire type centralized lubrication control system and control method - Google Patents
Single-wire type centralized lubrication control system and control method Download PDFInfo
- Publication number
- CN113586930A CN113586930A CN202110871738.5A CN202110871738A CN113586930A CN 113586930 A CN113586930 A CN 113586930A CN 202110871738 A CN202110871738 A CN 202110871738A CN 113586930 A CN113586930 A CN 113586930A
- Authority
- CN
- China
- Prior art keywords
- mode
- module
- signal
- temperature
- lubrication
- 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
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N29/00—Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems
- F16N29/04—Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems enabling a warning to be given; enabling moving parts to be stopped
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
- F16N7/38—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated with a separate pump; Central lubrication systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N2250/00—Measuring
- F16N2250/04—Pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N2250/00—Measuring
- F16N2250/08—Temperature
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Auxiliary Devices For Machine Tools (AREA)
Abstract
The invention discloses a single-wire centralized lubrication control system and a control method, which adopt electric control intelligent control, enter automatic cycle operation by setting lubrication time or times, and intermittent time or times, monitor and protect each link in the system operation process, and when abnormity is found, the system enters a corresponding alarm state and is displayed on an LED screen of equipment, thereby improving the stability and the service life of the single-wire centralized lubrication system, being closer to the actual use condition of the equipment, and being worthy of popularization and application. The control method comprises the lubrication mode of the existing single-line centralized lubrication system, the lubrication mode can be decomposed into a counting mode and a timing mode, each mode has independent parameters which can be set freely, the control is more flexible and practical, and the purpose of intelligent control is realized.
Description
Technical Field
The invention relates to the technical field of lubricant supply, in particular to a single-wire centralized lubrication control system and a control method.
Background
The single-wire centralized lubrication system has the working principle that: the single-line centralized lubricating system outputs lubricating grease from a pump station, and changes one-way oil transportation into multi-way oil output through a primary (mother) distributor. The multi-path oil is divided into more branch oil paths by a secondary (sub) distributor; a three-stage (grandchild) distributor can be added according to the requirement, so that a single-line progressive oil way is formed, and lubricating grease can be supplied to hundreds of lubricating points. The single-wire centralized lubricating system is widely applied to mining machinery, steel, metallurgical machinery, hydraulic machinery, cement machinery, transport vehicle port machinery, construction machinery, forging machinery and the like.
The single-wire lubrication system mainly comprises a plunger pump, a single-wire distributor and related pipelines. The lubricating pump of the single-wire centralized lubricating system comprises a plurality of pump cores and a plurality of outlets, wherein each outlet is externally connected with a lubricating pipe, and then a distributor is arranged on a lubricating pipeline according to the requirements of lubricating points. The advantage has a plurality of lubricating pump cores, has many output pipeline, and each lubricated branch road does not influence each other, and the distributor is difficult for blockking up. The lubricating branch circuit has the defect that when any lubricating branch circuit has a problem and other branch circuits work normally, the whole system cannot generate an alarm signal, so that the problem that the whole system cannot be monitored is caused.
Based on the technical problems existing in the single-wire centralized lubrication system, no relevant solution is provided; there is therefore a pressing need to find effective solutions to the above problems.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a single-wire centralized lubrication control system and a control method, when the phenomena of over-low ambient temperature, over-low oil level, oil circuit blockage, abnormal oil circuit pressure and the like cause abnormal operation of equipment, a corresponding detection control means is added to ensure the normal operation of the equipment, one lubrication branch has a problem, and when other branches work normally, an alarm signal appears in the system, so that the monitoring of the whole system is realized, and the stability and the service life of the single-wire centralized lubrication system are further improved.
The technical scheme of the embodiment of the invention is as follows:
the embodiment of the invention provides a single-wire centralized lubrication control method, which comprises the following processes:
s1: powering on and starting the equipment, setting the lubricating frequency as N or the lubricating time as T, and setting the intermittent frequency N or the intermittent time T; detecting a low oil level signal and temperature, and carrying out the next step when the detection is normal; detecting abnormality of the low oil level signal and alarming; stopping the machine when the temperature is detected abnormally;
s2: the motor runs, enters a lubricating mode, and selects a counting or timing mode; the lubrication mode is a counting mode, when the actual lubrication times are equal to N, the motor stops, and the motor enters an intermittent mode; the lubrication mode is a timing mode, and when the actual lubrication time is T, the motor stops and enters an intermittent mode;
s3: entering an intermittent mode, and selecting a counting or timing mode; the intermittent mode is a counting mode, when the actual intermittent times is n, the operation returns to S2, the motor runs, and the lubricating mode is entered; the intermittent mode is a timing mode, when the actual intermittent time is t, the operation returns to S2, the motor runs, and the lubricating mode is entered;
s4: repeating the steps S2 and S3 for circulating operation;
wherein, the control system monitors low oil level signal, blockage signal, temperature and whether pipeline pressure signal can be detected in the running process of S2-S3;
when the oil is lower than the minimum value of the oil, judging the oil is abnormal, and outputting a corresponding alarm code;
when the temperature is lower than the solidification temperature of the lubricating oil, judging that the lubricating oil is abnormal, stopping the motor, and outputting a corresponding alarm code;
when the blocking signal is detected, judging that the signal is abnormal, stopping running the motor, and outputting a corresponding alarm code;
and if the pipeline pressure signal is not detected within the set time, the motor stops running and outputs a corresponding alarm code.
Correspondingly, the embodiment of the invention also provides a single-wire centralized lubrication control system, which is applied to the single-wire centralized lubrication control method and comprises a power module, an input module, an output module, a temperature detection module and an MCU module; the input module is connected to the MCU module and configured to receive an external signal, where the external signal includes but is not limited to: setting an oil level signal, a blockage signal and parameters; the output module is connected with the MCU module and used for converting the control signal of the MCU module into power to output so as to spray grease for lubrication; the output module outputs alarm signals and display parameters; the temperature detection module is connected with the MCU module, the MCU module acquires the current temperature through the temperature detection module, and the MCU module stops running when the temperature is lower than the set temperature; the MCU module is connected with the input module, the output module and the temperature detection module and automatically operates based on external signals of the input module and parameters set by a user.
Further, the method also comprises LED display and panel operation, wherein the LED display can display the character code number of the output alarm signal and the output display parameter.
Further, the input module adopts a photoelectric coupling chip.
Further, the number of the jam signals at least comprises 1, and a sensor for detecting the jam sends out the signals.
Further, the power supply module is connected with a wide voltage input of DC 11-36V.
Further, the set temperature is a freezing temperature of the lubricating oil.
The embodiment of the invention achieves the following beneficial effects:
the embodiment of the invention utilizes the control system and the control method to realize the monitoring of the whole system of the single-wire centralized lubrication system, when the phenomena of over-low ambient temperature, over-low oil level, oil circuit blockage, abnormal oil circuit pressure and the like cause abnormal operation of equipment, corresponding detection control means are added to ensure the normal operation of the equipment, the automatic cycle operation is carried out by adopting the electric control intelligent control, the lubrication time or times, the intermittent time or times are set to carry out the monitoring protection of each link in the operation process of the equipment, when the abnormality is found, the equipment enters a corresponding alarm state and is displayed on an LED screen of the equipment, the stability and the service life of the single-wire centralized lubrication system are further improved, the single-wire centralized lubrication system is closer to the actual use working condition of the equipment, and the popularization and application are worth. The control method comprises the lubricating mode of the existing single-line centralized lubricating system, the lubricating mode can be decomposed into a counting mode and a timing mode, each mode has independent parameters which can be set freely, the control is more flexible and practical, and the purpose of intelligent control is achieved.
Drawings
Fig. 1 is a wire-frame schematic diagram of a single-wire centralized lubrication control system according to an embodiment of the present invention.
Fig. 2 is a flow chart of a single-line centralized lubrication control method according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the present invention by those skilled in the art, specific embodiments thereof are described below with reference to the accompanying drawings.
It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, the present invention provides a single-wire centralized lubrication control system, which adopts electric control intelligent control, enters automatic circulation operation by setting lubrication time or frequency, and intermittent time or frequency, and performs monitoring protection of each link in the operation process of equipment, and includes: and when the abnormality is found, the equipment enters a corresponding alarm state and is displayed on an LED screen of the equipment.
The counting in the counting mode under the lubrication mode and the intermittent mode is that the control system can identify the pulse signal sent by the terminal equipment, and the control system receives the pulse signal once to count once. The terminal equipment refers to equipment needing lubrication where the single-wire type lubrication system is installed.
The control system comprises a power supply module, an input module, an output module, a temperature detection module, an LED display module, a panel operation module and an MCU module.
The functions of the modules are as follows:
a power supply module: the voltage-controlled power supply is connected with the MCU module, can be directly connected with DC11-36V wide voltage input, and processes an input power supply through measures such as filtering, directional current and the like so as to prevent negative effects on a control system caused by electrode reverse connection, voltage fluctuation, surge impact and the like.
An input module: and the MCU module is connected with the MCU module and used for receiving external signals, wherein the external signals include but are not limited to: oil level signal, blockage signal, command, parameter setting. The input module can adopt a photoelectric coupling chip, and effectively solves the problem of high-low voltage isolation.
An output module: the MCU module is connected with the control circuit and is used for converting the control signal of the MCU module into power output for grease spraying lubrication; the output module outputs alarm signals, display parameters and the like.
A temperature detection module: and the MCU module is connected with the MCU module, acquires the current temperature through the temperature detection module, and stops running when the temperature is lower than the set temperature. The set temperature is the freezing temperature of the lubricating oil. Specifically, in the embodiment, the temperature is set to be-15 ℃, and the operation is stopped when the temperature is below-15 ℃, so that the abnormality of equipment caused by solidification of grease is prevented.
And the MCU module is connected with the input module, the output module and the temperature detection module and automatically operates based on external signals of the input module and parameters set by a user.
LED display: and the MCU module is connected with the display module and can display the result of the output module, namely the character code of the alarm signal and the display parameter.
Panel operation: and the MCU module is connected with the MCU module and is a link for man-machine conversation. The panel operation can use a touch screen and a touch screen, has the advantages of sensitive response speed, easy communication, firmness, durability, space saving and the like, is the most convenient, simple and natural man-machine interaction mode at present, and can be operated and used conveniently by a user only by slightly using a finger to display icons or characters on the screen.
The number of jam signals includes at least 1, and a sensor for detecting jam sends out signals. Specifically, in this embodiment, there are 4 occlusion signals, including occlusion signal 1, occlusion signal 2, occlusion signal 3, and occlusion signal 4.
As shown in fig. 2, an embodiment of the present invention further provides a single-wire centralized lubrication control method, including the following steps:
s1: powering on and starting the equipment, setting the lubricating frequency as N or the lubricating time as T, and setting the intermittent frequency N or the intermittent time T; starting low oil level signal detection and temperature detection, and carrying out the next step without problems;
s2: step S1, the motor runs normally, the lubricating mode is entered, and the counting or timing mode is selected; the lubrication mode is a counting mode, when the actual lubrication times are equal to N, the motor stops, and the motor enters an intermittent mode; the lubrication mode is a timing mode, and when the actual lubrication time is T, the motor stops and enters an intermittent mode;
s3: entering an intermittent mode, and selecting a counting or timing mode; the intermittent mode is a counting mode, when the actual intermittent times is n, the operation returns to S2, the motor runs, and the lubricating mode is entered; the intermittent mode is a timing mode, when the actual intermittent time is t, the operation returns to S2, the motor runs, and the lubricating mode is entered;
s4: repeating the steps S2 and S3 for circulating operation;
wherein, the control system monitors low oil level signal, blockage signal, temperature and whether pipeline pressure signal can be detected in the running process of S2-S3;
when the oil is lower than the minimum value of the oil, judging the oil is abnormal, outputting an alarm code 'EL', and reminding a user of adding lubricating oil in time;
when the temperature is lower than-15 ℃, judging that the motor is abnormal, stopping running the motor, and outputting an alarm code 'ES 6';
when the blockage signal 1 is detected, judging that the blockage signal is abnormal, stopping the operation of the equipment, and outputting an alarm code 'ES 1';
when the blocking signal 2 is detected, judging that the device is abnormal, stopping running the device, and outputting an alarm code 'ES 2';
when a blocking signal 3 is detected, judging that the device is abnormal, stopping running the device, and outputting an alarm code 'ES 3';
when the jam signal 4 is detected, the abnormality is determined, the apparatus stops operating, and an alarm code "ES 4" is output.
And if the pipeline pressure signal is not detected within the set time, the motor stops running and outputs an alarm code EP.
The control system parameters are set as follows:
| serial number | Item | Parameter(s) | Unit of |
| 1 | Low temperature protection value | 0～-50 | ℃ |
| 2 | Oil circuit under-voltage detection time | 1～9999 | Second of |
| 3 | Lubrication mode counting | 1～9999 | Next time |
| 4 | Lubrication mode timing | 1～9999 | Second of |
| 5 | Intermittent mode counting | 1～9999 | Next time |
| 6 | Intermittent mode timing | 1～9999 | Is divided into |
The alarm code is set as follows:
| serial number | Item | (Code) |
| 1 | Low oil level alarm | EL |
| 2 | Oil circuit under-pressure alarm | EP |
| 3 | Jamming signal 1 alarm | ES1 |
| 4 | Jamming signal 2 alarm | ES2 |
| 5 | Jamming signal 3 alarm | ES3 |
| 6 | Jam signal 4 alarm | ES4 |
| 7 | Low temperature alarm | ES6 |
The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (7)
1. A single-wire centralized lubrication control method, the control method comprising the processes of:
s1: powering on and starting the equipment, setting the lubricating frequency as N or the lubricating time as T, and setting the intermittent frequency N or the intermittent time T; detecting a low oil level signal and temperature, and carrying out the next step when the detection is normal; detecting abnormality of the low oil level signal and alarming; stopping the machine when the temperature is detected abnormally;
s2: the motor runs, enters a lubricating mode, and selects a counting or timing mode; the lubrication mode is a counting mode, when the actual lubrication times are equal to N, the motor stops, and the motor enters an intermittent mode; the lubrication mode is a timing mode, and when the actual lubrication time is T, the motor stops and enters an intermittent mode;
s3: entering an intermittent mode, and selecting a counting or timing mode; the intermittent mode is a counting mode, when the actual intermittent times is n, the operation returns to S2, the motor runs, and the lubricating mode is entered; the intermittent mode is a timing mode, when the actual intermittent time is t, the operation returns to S2, the motor runs, and the lubricating mode is entered;
s4: repeating the steps S2 and S3 for circulating operation;
wherein, the control system monitors low oil level signal, blockage signal, temperature and whether pipeline pressure signal can be detected in the running process of S2-S3;
when the oil is lower than the minimum value of the oil, judging the oil is abnormal, and outputting a corresponding alarm code;
when the temperature is lower than the solidification temperature of the lubricating oil, judging that the lubricating oil is abnormal, stopping the motor, and outputting a corresponding alarm code;
when the blocking signal is detected, judging that the signal is abnormal, stopping running the motor, and outputting a corresponding alarm code;
and if the pipeline pressure signal is not detected within the set time, the motor stops running and outputs a corresponding alarm code.
2. A single-wire centralized lubrication control system, characterized in that: the single-wire centralized lubrication control method according to claim 1, wherein the control system comprises a power supply module, an input module, an output module, a temperature detection module and an MCU module;
the input module is connected to the MCU module and configured to receive an external signal, where the external signal includes but is not limited to: setting an oil level signal, a blockage signal and parameters;
the output module is connected with the MCU module and used for converting the control signal of the MCU module into power to output so as to spray grease for lubrication; the output module outputs alarm signals and display parameters;
the temperature detection module is connected with the MCU module, the MCU module acquires the current temperature through the temperature detection module, and the MCU module stops running when the temperature is lower than the set temperature;
the MCU module is connected with the input module, the output module and the temperature detection module and automatically operates based on external signals of the input module and parameters set by a user.
3. The single-wire centralized lubrication control system according to claim 2, wherein: the LED display device further comprises an LED display and panel operation, wherein the LED display can display the character code number of the output alarm signal and the output display parameter.
4. The single-wire centralized lubrication control system according to claim 1, wherein: the input module adopts a photoelectric coupling chip.
5. The single-wire centralized lubrication control system according to claim 2, wherein: the number of the jam signals at least comprises 1, and a sensor for detecting the jam sends out signals.
6. The single-wire centralized lubrication control system according to claim 2, wherein: the power supply module is connected with a wide voltage input of DC 11-36V.
7. The single-wire centralized lubrication control system according to claim 2, wherein: the set temperature is the freezing temperature of the lubricating oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110871738.5A CN113586930A (en) | 2021-07-30 | 2021-07-30 | Single-wire type centralized lubrication control system and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110871738.5A CN113586930A (en) | 2021-07-30 | 2021-07-30 | Single-wire type centralized lubrication control system and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113586930A true CN113586930A (en) | 2021-11-02 |
Family
ID=78252625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110871738.5A Pending CN113586930A (en) | 2021-07-30 | 2021-07-30 | Single-wire type centralized lubrication control system and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113586930A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115307047A (en) * | 2022-07-13 | 2022-11-08 | 北京现代汽车有限公司 | Equipment lubrication monitoring system and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0587293A (en) * | 1991-09-25 | 1993-04-06 | Riyuube Kk | Concentrated lubrication device |
| US20030037719A1 (en) * | 2001-08-27 | 2003-02-27 | Nsk Ltd. | Grease supply confirming device and method |
| CN210219262U (en) * | 2019-05-31 | 2020-03-31 | 中国核工业电机运行技术开发有限公司 | Centralized intelligent lubricating and bearing monitoring system |
-
2021
- 2021-07-30 CN CN202110871738.5A patent/CN113586930A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0587293A (en) * | 1991-09-25 | 1993-04-06 | Riyuube Kk | Concentrated lubrication device |
| US20030037719A1 (en) * | 2001-08-27 | 2003-02-27 | Nsk Ltd. | Grease supply confirming device and method |
| CN210219262U (en) * | 2019-05-31 | 2020-03-31 | 中国核工业电机运行技术开发有限公司 | Centralized intelligent lubricating and bearing monitoring system |
Non-Patent Citations (2)
| Title |
|---|
| 大连工学院机制专业《电工学》编写组: "《电工学》", 31 July 1978, pages: 57 * |
| 成建群: "《机床拆装与维护》", 31 August 2017, pages: 143 - 146 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115307047A (en) * | 2022-07-13 | 2022-11-08 | 北京现代汽车有限公司 | Equipment lubrication monitoring system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110805551A (en) | Intelligent control method for multi-pump-set water supply system | |
| CN210219262U (en) | Centralized intelligent lubricating and bearing monitoring system | |
| CN113586930A (en) | Single-wire type centralized lubrication control system and control method | |
| CN206965290U (en) | A kind of monitoring system of petrol station filter screen differential pressure | |
| CN202521205U (en) | Lubrication system, concrete pumping equipment and engineering machinery | |
| CN102236341A (en) | Data acquisition and control platform | |
| CN104913179B (en) | A kind of automatic lubricating system | |
| CN203067092U (en) | Diesel engine safety protection controller | |
| CN103587140A (en) | Fault monitoring system, fault monitoring method and hydraulic machine of hydraulic system | |
| CN108716610B (en) | Single-wire centralized lubrication system with blockage alarm display | |
| CN212623717U (en) | Remote energy consumption monitoring system based on raspberry group | |
| CN103771279A (en) | Control method for centralized control integrated device of hydraulic pump station and electrodeless rope continuous motor tractor | |
| CN111338279A (en) | Intelligent variable frequency control cabinet | |
| CN2831146Y (en) | Antistatic wrist worn states central monitor | |
| CN113586924A (en) | Double-wire type centralized lubrication control system and control method | |
| CN104933385A (en) | SMT transmission equipment monitoring system based on photoelectric sensors | |
| CN2482622Y (en) | Intelligent multi-point type central lubricating apparatus | |
| CN203807496U (en) | Concentrated on-line monitoring system for environment coal gas of multiple blast furnaces | |
| CN111578117A (en) | Lubrication monitoring system of automatic equipment | |
| CN112983932A (en) | Hydraulic test bed equipment and data acquisition system, measurement and control system and measurement and control method thereof | |
| CN220252698U (en) | Intelligent joint control early warning device for water system control | |
| CN219831690U (en) | Locking inquiry circuit for collecting fault points along coal mine belt line | |
| CN211083578U (en) | Fixed car lifting jack and lubricating device thereof | |
| CN204473777U (en) | Mine-used I. S tandem device | |
| CN215538049U (en) | Fire-fighting water pump control cabinet linkage control box |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211102 |
|
| RJ01 | Rejection of invention patent application after publication |