CN112378582A - Dynamic balance weight-removing system and control method thereof - Google Patents
Dynamic balance weight-removing system and control method thereof Download PDFInfo
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- CN112378582A CN112378582A CN202011174773.3A CN202011174773A CN112378582A CN 112378582 A CN112378582 A CN 112378582A CN 202011174773 A CN202011174773 A CN 202011174773A CN 112378582 A CN112378582 A CN 112378582A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000006073 displacement reaction Methods 0.000 claims abstract description 42
- 238000003825 pressing Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/30—Compensating imbalance
- G01M1/34—Compensating imbalance by removing material from the body to be tested, e.g. from the tread of tyres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
- B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B51/00—Arrangements for automatic control of a series of individual steps in grinding a workpiece
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/06—Dust extraction equipment on grinding or polishing machines
- B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
- B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Abstract
The invention relates to the technical field of aero-engine de-weighting systems, in particular to a dynamic balance de-weighting system and a control method thereof, wherein the system comprises a control box and handheld equipment; the handheld equipment comprises a displacement sensor and a grinding motor; the control box comprises a touch screen, a PLC (programmable logic controller) respectively connected with the touch screen, the displacement sensors and the grinding motor, a 24V fixed power supply for supplying working power to the touch screen, the PLC and the three displacement sensors, and a 0-24V adjustable power supply for supplying the working power to the grinding motor. This remove heavy system flexible operation, simple easy learning need not complicated protection and calculation process, removes heavy precision height, but significantly reduced removes heavy grinding number of times, improves and removes heavy efficiency, has realized clean chip removal, can not splash because of the piece, pollutes the workstation, can directly remove heavy operation on dynamic balancing machine operation platform, reduces the dismouting number of times, avoids the measuring error that the assembly difference brought.
Description
Technical Field
The invention relates to the technical field of aero-engine de-weighting systems, in particular to a dynamic balance de-weighting system and a control method thereof.
Background
The aeroengine encounters a great deal of vibration problems in the development and production process, which seriously hinders the development progress and product quality of the engine, wherein about more than 60% of the whole machine vibration is caused by the unbalance of the rotor, the mass of the rotor of the engine is uneven and the processing error exists, the gravity center of the rotor can deviate from the rotating center line, and the rotor vibrates due to the transmission of force between the centrifugal force and the supporting part during high-speed rotation, so when the vibration reduction and vibration problems of the engine are eliminated, the dynamic balance of the rotor becomes the most important and effective means.
The most important equipment for detecting the dynamic balance of the rotor is a dynamic balancing machine, the unbalance amount (namely the eccentric position of the gravity center of the rotor and the unbalance mass) of the rotor can be accurately measured, and the rotor can reach the optimal dynamic balance state by correcting the unbalance amount of the rotor.
At present, two modes of weight increasing and weight removing are mainly adopted for correcting unbalance of a rotor, a large engine is mainly corrected in a weight increasing mode, weight increasing is achieved through a complex connecting and fastening structure, and for a small turbojet engine, the rotor is small in overall size, high in rotating speed, high in correction requirement for two unbalanced ends, compact in structure and inconvenient to weight increasing operation, so that the weight removing mode is usually selected.
The de-weight usually adopts a grinding mode, and the main operation flow is as follows: 1) determining a weight removal position and weight removal quality through rotor dynamic balance measurement; 2) the rotor is disassembled from the driven balancing machine rack, and the non-weight-removing parts of the rotor are wrapped and protected (particularly bearings); 3) grinding the rotor and cleaning up the chips; 4) the rotor is remounted on a dynamic balancing machine rack for test verification; 5) and if the weight removal does not meet the weight removal requirement, repeating the steps 1-4) until the weight removal meets the design requirement.
At present, the weight removing method has the following defects: in the process of weight removal and grinding, the weight removal is determined only by visual observation and hand feeling, and then the verification is carried out by dynamic balance measurement again, usually, the rotor unbalance correction needs 5-10 times when reaching the design requirement, and the efficiency is low; a large amount of splashed scraps are generated in the grinding process, other parts are polluted, the other parts need to be protected, and the scraps left on the surfaces of the parts need to be cleaned in time after grinding; grinding operation all need all lift the rotor from the dynamic balancing machine off at every turn, prevents that the piece from polluting the dynamic balancing machine, when installing again, still can lead to the measuring error increase because of differences such as mounted position, belt elasticity, increased the loss of dynamic balancing machine, dismantlement operation many times causes colliding with of spare part easily, has the safety risk.
Disclosure of Invention
The invention provides a dynamic balance weight-removing system and a control method thereof aiming at the defects existing when the rotor unbalance amount is corrected by adopting the current weight-removing mode, and solves the technical problems that the weight-removing is determined only by visual and hand feeling in the existing weight-removing grinding process, and then the verification is carried out by dynamic balance measurement again, the rotor unbalance correction usually needs 5-10 times when reaching the design requirement, and the efficiency is low; the technical problems that a large amount of splashed scraps are generated in the grinding process, other parts are polluted, other parts need to be protected, and the scraps left on the surfaces of the parts need to be cleaned in time after grinding are solved; the problem of at every turn grinding operation all need lift the rotor from the dynamic balancing machine off, prevent that the piece from polluting the dynamic balancing machine, when installing again, still can lead to measuring error increase because of differences such as mounted position, belt elasticity, increased the loss of dynamic balancing machine, dismantle many times and operate the technical problem that causes colliding with of spare part easily, there is the safety risk.
In order to achieve the purpose, the invention provides the following technical scheme:
the dynamic balance weight removal system comprises: a control box and a handheld device;
the handheld equipment comprises a displacement sensor and a grinding motor;
the control box comprises a touch screen, a PLC (programmable logic controller) respectively connected with the touch screen, the displacement sensors and the grinding motor, a 24V fixed power supply for supplying working power to the touch screen, the PLC and the three displacement sensors, and a 0-24V adjustable power supply for supplying working power to the grinding motor.
Preferably, the handheld device further comprises a fixed seat, and the grinding motor and the fixed seat are connected and fastened through three first screws.
Preferably, the displacement sensor and the fixed seat are connected and fastened through a clamp and a second screw, and the movable part of the displacement sensor extends out of the fixed seat.
Preferably, the handheld device further comprises a movable sleeve, and a spring is installed between the movable sleeve and the fixed seat.
Preferably, the movable sleeve and the fixed seat are fixedly connected through a third screw, and the movable sleeve can move along the axial direction.
Preferably, the moving sleeve is further connected with a sealing ring, and the sealing ring is tightly sleeved with the moving sleeve.
Preferably, the grinding motor is provided with a grinding head, the grinding head can be replaced, and the handheld device is further provided with a handheld switch and a chip removal hole.
The control method of the dynamic balance weight removal system comprises the following steps:
electrifying the control box to electrify the 24V fixed power supply, the 0-24V adjustable power supply, the touch screen, the PLC and the displacement sensor, and keeping the grinding motor in a power-off state;
calibrating a zero point, vertically pressing a fixed seat of handheld equipment by holding the handheld equipment, contacting with a plane of a material to be removed, pressing until a grinding head contacts with a horizontal platform, pressing a '0-point calibration' key on a touch screen, and recording an average value (h) of displacement values of three displacement sensors by a PLC (programmable logic controller);
inputting a grinding weight requirement (m) obtained by a dynamic balance test into a touch screen, wherein the grinding weight requirement (m) is obtained according to the density (rho) of the material, the radius (R) of a grinding head and m ═ pi rho/3 (3R-t) t2Determining the grinding depth t, removing the weight according to the depth t when t is less than or equal to R, and re-determining m-2/3 pi rho R when t is more than R2+πρR2(t-R), calculating the depth of deduplication,
the grinding depth t is not more than 2/3R, when t is more than 2/3R, the touch screen displays an alarm to confirm whether to continue grinding or prompt to grind for multiple times, when multiple times of grinding are selected, the grinding times and the grinding weight of each time are recorded, and the residual grinding amount is calculated;
holding the handheld device by hand, clicking a 'start grinding' button on the touch screen, pressing a handheld switch of the handheld device, and starting the operation of a grinding motor;
aligning the handheld device to a position of a material to be subjected to weight removal, enabling a scrap discharge hole to be downward, placing a storage box below the handheld device to receive grinding scraps, pressing the handheld device for grinding, recording the average displacement in real time by a displacement sensor, automatically controlling a grinding motor to stop running by a PLC (programmable logic controller) when the average displacement is h + t, and prompting the completion of grinding by a touch screen;
and (4) loosening the handheld switch, retracting the handheld equipment, and closing the 24V fixed power supply and the 0-24V adjustable power supply in the control box to finish the repeated grinding operation.
Preferably, a relay is arranged between the grinding motor and the PLC, and the starting and stopping operation of the grinding motor is realized by giving a control signal by the PLC and controlling the on and off of the relay so as to control the starting and stopping of the grinding motor.
Compared with the prior art, the invention has the following beneficial effects:
1. the dynamic balance de-weighting system provided by the invention is flexible to operate, simple and easy to learn, and does not need complex protection and calculation processes.
2. The dynamic balance weight-removing system provided by the invention has high weight-removing precision, can greatly reduce the number of times of weight-removing grinding and improves the weight-removing efficiency.
3. The dynamic balance de-weighting system provided by the invention realizes cleaning and chip removal, avoids the pollution to a workbench caused by the splashing of chips, can directly perform de-weighting operation on an operation platform of a dynamic balancing machine, reduces the times of disassembly and assembly, and avoids measurement errors caused by assembly differences.
Drawings
FIG. 1 is a first schematic diagram illustrating the connection of components of a dynamic balance deduplication system according to an embodiment of the present invention;
FIG. 2 is a second schematic diagram illustrating the connection of components of the dynamic balance deduplication system according to an embodiment of the present invention;
fig. 3 is a first schematic structural diagram of a handheld device in a dynamic balance deduplication system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a handheld device in a dynamic balance deduplication system according to an embodiment of the present invention;
the grinding machine comprises a grinding motor 1, a fixed seat 2, a first screw 21, a displacement sensor 3, a hoop 31, a moving sleeve 4, a third screw 41, a spring 5, a sealing ring 6, a handheld switch 7, a grinding head 8 and a chip removal hole 9.
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "inner", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In order to more clearly and specifically describe the dynamic balance deduplication system and the control method thereof provided by the embodiment of the present invention, the following description is given with reference to specific embodiments.
Example 1
As shown in fig. 1 to 4, the present embodiment provides a dynamic balance deduplication system, including: a control box and a handheld device;
the handheld equipment comprises a displacement sensor 3 and a grinding motor 1;
the control box comprises a touch screen, a PLC (programmable logic controller) respectively connected with the touch screen, the displacement sensors 3 and the grinding motor 1, a 24V fixed power supply for supplying working power to the touch screen, the PLC and the three displacement sensors, and a 0-24V adjustable power supply for supplying the working power to the grinding motor 1.
The handheld device further comprises a fixed seat 2, and the grinding motor 1 and the fixed seat 2 are connected and fastened through three first screws 21.
The handheld device further comprises a movable sleeve 4, and a spring 5 is arranged between the movable sleeve 4 and the fixed seat 2.
The movable sleeve 4 and the fixed seat 2 are tightly connected through a third screw 41, and the movable sleeve 4 can move along the axial direction.
The movable sleeve 4 is further connected with a sealing ring 6, and the sealing ring 6 is tightly sleeved with the movable sleeve 4.
The grinding motor 1 is provided with a grinding head 8, the grinding head 8 can be replaced, and the handheld device is further provided with a handheld switch 7 and a chip removal hole 9.
In the embodiment, the adjustable power supply is a 0-24V adjustable power supply and mainly supplies power to the grinding motor, the grinding motor can be properly adjusted according to the characteristics of grinding hardness materials when the grinding motor is in different grinding rotating speeds under different voltages, and the start-stop operation of the grinding motor is mainly realized by giving out a control signal by a PLC (programmable logic controller) and controlling the on-off of a relay so as to control the start-stop of the grinding motor.
In the embodiment, the fixed power supply is a 24V fixed voltage power supply and is mainly used for providing working power for the PLC, the touch screen and the displacement sensor, the PLC is a programmable controller and is responsible for receiving a displacement signal of the displacement sensor, judging a 0 point and a grinding in-place displacement point and realizing the function of automatically stopping the operation of the grinding motor when the grinding is in place, the PLC also has a grinding depth calculation function, the touch screen is operated to input parameters such as material weight and material density and the diameter of the grinding head to the PLC, and the PLC can automatically calculate the grinding displacement.
The control method of the dynamic balance weight removal system in the embodiment includes the following steps:
electrifying the control box to electrify the 24V fixed power supply, the 0-24V adjustable power supply, the touch screen, the PLC and the displacement sensor, and keeping the grinding motor in a power-off state;
calibrating a zero point, vertically pressing a fixed seat 2 of a handheld device by holding the handheld device downwards, making planar contact with a material to be removed, pressing until a grinding head 8 is in contact with a horizontal platform, pressing a '0-point calibration' key on a touch screen, and recording an average value (h) of displacement values of three displacement sensors 3 by a PLC (programmable logic controller);
inputting a grinding weight requirement (m) obtained by a dynamic balance test into a touch screen, wherein the grinding weight requirement (m) is obtained according to the density (rho) of the material, the radius (R) of a grinding head and m ═ pi rho/3 (3R-t) t2Determining the grinding depth t, removing the weight according to the depth t when t is less than or equal to R, and re-determining m-2/3 pi rho R when t is more than R2+πρR2(t-R), calculating the depth of deduplication,
the grinding depth t is not more than 2/3R, when t is more than 2/3R, the touch screen displays an alarm to confirm whether to continue grinding or prompt to grind for multiple times, when multiple times of grinding are selected, the grinding times and the grinding weight of each time are recorded, and the residual grinding amount is calculated;
holding the handheld device by hand, clicking a 'start grinding' button on the touch screen, pressing a handheld switch 7 of the handheld device, and starting the operation of the grinding motor 1;
aligning the handheld device to a position where a material to be subjected to weight removal needs to be subjected to weight removal, enabling a scrap discharge hole 9 to be downward, placing a storage box below the scrap discharge hole to receive grinding scraps, pressing the handheld device for grinding, recording the average displacement in real time by a displacement sensor 3, automatically controlling a grinding motor 1 to stop running by a PLC (programmable logic controller) when the average displacement is h + t, and prompting the completion of grinding by a touch screen;
and (4) loosening the handheld switch 7, retracting the handheld equipment, and closing the 24V fixed power supply and the 0-24V adjustable power supply in the control box to finish the repeated grinding operation.
A relay is arranged between the grinding motor 1 and the PLC, and the starting and stopping operation of the grinding motor 1 is realized by giving a control signal by the PLC and controlling the on and off of the relay so as to control the starting and stopping of the grinding motor 1.
The calculation of the depth of weight removal provided by the embodiment of the present invention is designed according to a spherical grinding head, and may be changed into grinding heads with other shapes, and the calculation formula may be changed, and the above embodiment of the present invention should not be considered as a limitation to the claims of the present invention, and if those skilled in the art do not need creative work through the teaching of the present invention, they should fall within the protection scope of the claims of the present invention.
Claims (9)
1. Dynamic balance removes heavy system, its characterized in that: the dynamic balance weight removal system comprises: a control box and a handheld device;
the handheld equipment comprises a displacement sensor (3) and a grinding motor (1);
the control box comprises a touch screen, a PLC (programmable logic controller) respectively connected with the touch screen, the displacement sensors (3) and the grinding motor (1), a 24V fixed power supply for supplying working power to the touch screen, the PLC and the three displacement sensors, and a 0-24V adjustable power supply for supplying working power to the grinding motor (1).
2. The dynamic balance deduplication system of claim 1, wherein: the handheld device further comprises a fixed seat (2), and the grinding motor (1) and the fixed seat (2) are connected and fastened through three first screws (21).
3. The dynamic balance deduplication system of claim 2, wherein: displacement sensor (3) with fixing base (2) are through clamp (31) and second screwed connection fastening, the movable part of displacement sensor (3) stretches out fixing base (2).
4. The dynamic balance deduplication system of claim 2, wherein: the handheld device further comprises a movable sleeve (4), and a spring (5) is installed between the movable sleeve (4) and the fixed seat (2).
5. The dynamic balance deduplication system of claim 4, wherein: the movable sleeve (4) and the fixed seat (2) are fixedly connected through a third screw (41), and the movable sleeve (4) can move along the axial direction.
6. The dynamic balance deduplication system of claim 4, wherein: the moving sleeve (4) is further connected with a sealing ring (6), and the sealing ring (6) is tightly sleeved with the moving sleeve (4).
7. The dynamic balance deduplication system of claim 1, wherein: the grinding motor (1) is provided with a grinding head (8), the grinding head (8) can be replaced, and the handheld equipment is further provided with a handheld switch (7) and a chip removal hole (9).
8. The control method of the dynamic balance deduplication system of any one of claims 1-7, wherein: the method comprises the following steps:
electrifying the control box to electrify the 24V fixed power supply, the 0-24V adjustable power supply, the touch screen, the PLC and the displacement sensor, and keeping the grinding motor in a power-off state;
calibrating a zero point, vertically pressing a fixed seat (2) of a handheld device by holding, contacting with a plane of a material to be removed, pressing until a grinding head (8) contacts with a horizontal platform, pressing a '0-point calibration' key on a touch screen, and recording an average value (h) of displacement values of three displacement sensors (3) by a PLC (programmable logic controller);
inputting a grinding weight requirement (m) obtained by a dynamic balance test into a touch screen, wherein the grinding weight requirement (m) is obtained according to the density (rho) of the material, the radius (R) of a grinding head and m ═ pi rho/3 (3R-t) t2Determining the grinding depth t, removing the weight according to the depth t when t is less than or equal to R, and re-determining m-2/3 pi rho R when t is more than R2+πρR2(t-R), calculating the depth of deduplication,
the grinding depth t is not more than 2/3R, when t is more than 2/3R, the touch screen displays an alarm to confirm whether to continue grinding or prompt to grind for multiple times, when multiple times of grinding are selected, the grinding times and the grinding weight of each time are recorded, and the residual grinding amount is calculated;
the handheld equipment is held by hand, a 'start grinding' button on a touch screen is clicked, a handheld switch (7) of the handheld equipment is pressed, and a grinding motor (1) starts to operate;
aligning the handheld equipment to a position where a material to be subjected to weight removal needs to be subjected to weight removal, enabling a scrap discharge hole (9) to be downward, placing a storage box below the scrap discharge hole to receive grinding scraps, pressing the handheld equipment for grinding, recording average displacement in real time by a displacement sensor (3), and when the average displacement is h + t, automatically controlling a grinding motor (1) to stop running by a PLC (programmable logic controller) and prompting the completion of grinding by a touch screen;
and (4) loosening the hand-held switch (7), retracting the hand-held equipment, and closing the 24V fixed power supply and the 0-24V adjustable power supply in the control box to finish the de-weighting grinding operation.
9. The control method of the dynamic balance deduplication system of claim 8, wherein: a relay is arranged between the grinding motor (1) and the PLC, and the starting and stopping operation of the grinding motor (1) is realized by giving a control signal by the PLC to control the on and off of the relay so as to control the starting and stopping of the grinding motor (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011174773.3A CN112378582A (en) | 2020-10-28 | 2020-10-28 | Dynamic balance weight-removing system and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011174773.3A CN112378582A (en) | 2020-10-28 | 2020-10-28 | Dynamic balance weight-removing system and control method thereof |
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| CN112378582A true CN112378582A (en) | 2021-02-19 |
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| CN202011174773.3A Pending CN112378582A (en) | 2020-10-28 | 2020-10-28 | Dynamic balance weight-removing system and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114291291A (en) * | 2021-12-03 | 2022-04-08 | 武汉航空仪表有限责任公司 | Method for controlling high-low temperature time error performance of automatic unlocking device |
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| JP2009229216A (en) * | 2008-03-21 | 2009-10-08 | Ihi Corp | Unbalance correction method and apparatus of rotating body |
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2020
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|---|---|---|---|---|
| GB1325918A (en) * | 1969-12-27 | 1973-08-08 | Avery Ltd W T | Unbalance correction |
| JP2009229216A (en) * | 2008-03-21 | 2009-10-08 | Ihi Corp | Unbalance correction method and apparatus of rotating body |
| JP2012021864A (en) * | 2010-07-14 | 2012-02-02 | Ihi Corp | Balance adjusting method and device |
| CN204639861U (en) * | 2015-05-15 | 2015-09-16 | 张万军 | A kind of processing of stone grinding attachment controlled based on PLC |
| CN109420939A (en) * | 2017-08-30 | 2019-03-05 | 南京锦冠汽车零部件有限公司 | A kind of automobile shafts processing automation equipment for grinding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114291291A (en) * | 2021-12-03 | 2022-04-08 | 武汉航空仪表有限责任公司 | Method for controlling high-low temperature time error performance of automatic unlocking device |
| CN114291291B (en) * | 2021-12-03 | 2023-12-22 | 武汉航空仪表有限责任公司 | Method for controlling high-low temperature time error performance of automatic unlocking device |
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