CN113296477B - Chain arm saw electrical control system - Google Patents
Chain arm saw electrical control system Download PDFInfo
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- CN113296477B CN113296477B CN202110530837.7A CN202110530837A CN113296477B CN 113296477 B CN113296477 B CN 113296477B CN 202110530837 A CN202110530837 A CN 202110530837A CN 113296477 B CN113296477 B CN 113296477B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/414—Structure of the control system, e.g. common controller or multiprocessor systems, interface to servo, programmable interface controller
- G05B19/4147—Structure of the control system, e.g. common controller or multiprocessor systems, interface to servo, programmable interface controller characterised by using a programmable interface controller [PIC]
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/34—Director, elements to supervisory
- G05B2219/34013—Servocontroller
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Abstract
The invention discloses an electric control system of a chain arm saw, which relates to the field of electric control systems, and comprises: a PLC control module, a chain speed pulse module, a swing arm angle encoder, a walking speed pulse module, a swing arm speed pulse module and a human-computer interface module which are electrically connected with the PLC control module, through the pulse signals induced by the chain speed pulse module, the swing arm angle encoder, the walking speed pulse module and the swing arm speed pulse module, under the logical operation of the PLC control module, the linear speed value of the chain and the chain arm saw walking and the angular speed value of the chain arm swing are calculated, the PLC control module controls the walking of the chain arm saw and the swinging action of the chain arm, provides compensation displacement and controls the chain arm saw to walk slowly, the chain arm is always contacted with a cutting surface in the low-speed swinging cutting process, the chain arm realizes no dead angle feeding, the dead angle problem in the stone cutting process is solved, the yield of the stone is improved, and the waste of resources is avoided.
Description
Technical Field
The invention relates to the field of electrical control systems, in particular to an electrical control system for a chain arm saw.
Background
At present rail mounted chain arm cutter, its control system adopts conventional low pressure electric elements combination control, does not possess programmable function, therefore the circuit is complicated loaded down with trivial details, and function abundance, upgradeability are relatively poor. In addition, all the prior rail-type arm-type sawing machines do not have feed compensation, have the problem of cutting dead angles, cause troubles to site construction and waste of resources.
And: the chain saw cutting circuit control system applied to the mine at present is mainly controlled by conventional buttons and instrument type electric elements, the control function is simple, the display data is single, stone mine dust is large, water vapor is heavy, and the button type electric elements are easy to accumulate dust or rust for a long time, so that faults are caused, and the production efficiency of equipment is influenced.
Disclosure of Invention
The invention aims to overcome the defects and provide an electrical control system for a chain arm saw.
An electrical control system for a chain arm saw, the electrical control system comprising: PLC control module and with PLC control module electric connection's chain speed pulse module, swing arm angle encoder, walking speed pulse module, swing arm speed pulse module and human-computer interface module, wherein:
chain speed pulse module: a pulse signal for sensing a chain speed of the chain arm saw;
swing arm angle encoder: a pulse signal for sensing an angular displacement of a chain arm swing of the chain arm saw;
walking speed pulse module: the pulse signal is used for sensing the walking speed of the chain arm saw;
swing arm speed pulse module: a pulse signal for sensing the swing of the chain arm saw;
a PLC control module: the device is used for receiving pulse signals of the chain speed pulse module, the swing arm angle encoder, the walking speed pulse module and the swing arm speed pulse module to obtain corresponding pulse numbers, and converting the pulse signals into linear speed values of the chain and the chain arm saw walking and angular speed values of the chain arm swing; calculating the real-time swinging angle value of the chain arm according to the number of received angular displacement pulse signals of the swing arm angle encoder and the transformation ratio of the chain arm saw speed reducer;
a human-computer interface module: the PLC is used for displaying a linear speed value of the chain, a chain arm saw walking, an angular speed value of the chain arm swing and an angle value of the chain arm real-time swing, and sending a control command to the PLC control module; the PLC control module makes corresponding execution actions according to the control instructions;
the execution action comprises a preparation execution action and a work execution action, and specifically comprises the following steps:
preparing to execute actions: under the condition that the chain arm saw is in a preparation mode, the action of quickly walking the chain arm saw and the action of quickly swinging the chain arm are executed;
the work execution action: and under the condition that the chain arm saw is in a working mode, the actions of slow walking and slow swinging of the chain arm saw are executed according to the linear speed value, the angular speed value and the angular value of the swinging of the chain arm, which are calculated by the PLC control module in real time, and the chain arm saw is controlled to be in contact with the cutting surface all the time in the process of slow swinging and cutting when the chain arm saw walks at a slow speed.
Preferably, the electrical control system further comprises an oil return pressure sensing module, wherein the oil return pressure sensing module is electrically connected with the PLC control module, and is used for detecting the pressure in the chain arm saw hydraulic pipeline and transmitting the detected electric signal to the PLC control module.
Preferably, this electrical control system still includes main pump pressure sensor, this main pump pressure sensor and PLC control module electric connection for detect the pressure of the interior main pump of chain arm saw hydraulic system, carry the signal of telecommunication that detects to PLC control module, convert analog digital quantity through PLC control module, and carry to the display of man-machine display module and show.
Preferably, this electrical control system still includes auxiliary pump pressure sensor, this auxiliary pump pressure sensor and PLC control module electric connection for detect the pressure of the interior auxiliary pump of chain arm saw hydraulic system, carry the signal of telecommunication that detects to PLC control module, convert analog digital quantity through PLC control module, and carry to man-machine display module and show.
Preferably, the electrical control system further comprises an oil temperature detection sensor, the oil temperature detection sensor is electrically connected with the PLC control module and used for detecting the temperature of hydraulic oil in the chain arm saw hydraulic system, transmitting the detected electric signal to the PLC control module, converting the electric signal into an analog digital quantity through the PLC control module and transmitting the analog digital quantity to the man-machine display module for displaying.
Preferably, this electrical control system still includes liquid level detection sensor, this liquid level detection sensor and PLC control module electric connection for detect the liquid level of the interior hydraulic oil of chain arm saw hydraulic system, and carry the signal of telecommunication that detects to PLC control module, convert analog digital quantity through PLC control module, and carry to man-machine display module and show.
Preferably, the electrical control system further comprises a heater and a cooler which are electrically connected with the PLC control module, and when the PLC control module determines that the oil temperature is lower than or higher than the allowable range value according to the detected oil temperature data, the heater or the cooler is correspondingly controlled to heat or cool the oil temperature.
Preferably, the heater is a resistance wire, and the cooler is a cooling fan.
Preferably, the electrical control system further comprises a lubrication system, which is controlled with a proportional valve, for lubrication at the transmission structure of the chain arm saw.
Preferably, this electrical control system still includes the thing networking systems who is connected with PLC control module communication, and this thing networking systems includes IOT module and cloud platform, and this IOT module is used for receiving PLC control module's operating data to convey to the cloud platform.
By adopting the technical scheme, the invention has the beneficial effects that:
1. the PLC control module receives the sensing signals of the sensing modules and transmits the sensing signals to the human-computer interface, so that data visualization is realized, and meanwhile, the corresponding control instructions are output through the human-computer interface to control the PLC control module to perform corresponding execution actions, so that the complexity of hardware circuits is greatly reduced in the whole electric control system, and faults are further reduced; meanwhile, a humanized dynamic visual interface enables personnel to operate more conveniently, and is simple and easy to operate; the interface data diversity gets rid of the complexity of installing various instruments.
2. Through chain speed pulse module, swing arm angle encoder, the pulse signal of walking speed pulse module and swing arm speed pulse module response, and under PLC control module's logical operation effect, calculate the chain, the linear velocity value of chain arm saw walking and the wobbling angular velocity value of chain arm, and through the walking of PLC control module control chain arm saw and the swing action of chain arm, provide compensation displacement, make the chain arm in chain arm saw walking working process, the chain arm contacts with the cutting plane all the time in the low-speed swing cutting process, the chain arm realizes that no dead angle feeds the cutting, the dead angle problem in the stone material cutting process has been solved, the lumber recovery of stone material has been improved, the waste of resource has been avoided.
3. Through the Internet of things system, the working data can be transmitted to the cloud end for data analysis and working parameter optimization, and program optimization and fault query processing can also be remotely performed.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only one or several embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to such drawings without creative efforts.
FIG. 1 is a functional block diagram of an electrical control system in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a chain arm swing feed displacement compensation according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a compensation process of the swing feed displacement of the chain arm according to the embodiment of the invention:
FIG. 4 is a schematic diagram of the embodiment of the present invention in which the link arm swings without performing the displacement compensation.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details or with other methods described herein.
According to the invention, referring to fig. 1, the electrical control system comprises a human-computer interface module which is in communication connection with a PLC control module, the PLC control module is electrically connected with a main pump pressure sensor, an auxiliary pump pressure sensor and a secondary pressure sensor, and is used for detecting the pressure of the main pump and the auxiliary pump in a chain arm saw hydraulic system, and transmitting a detected electrical signal to the PLC control module, the PLC control module reads 4-20mA current signals of the main pump pressure sensor, the auxiliary pump pressure sensor and the secondary pressure sensor, the analog digital quantity is converted in the PLC control module, the readable digital quantity is transmitted to the human-computer interface module through an RS485 communication line for display, a touch screen is used as a human-computer interaction interface, the control mode is diverse, and data parameters can be randomly called and displayed on the screen, giving more reference information to the operator; the screen has waterproof and dustproof effects, the service life of single-point touch can reach millions of times, and the defect that button elements frequently break down is overcome;
the PLC control module is electrically connected with an oil temperature sensor and a liquid level sensor, the oil temperature sensor is used for detecting the temperature of hydraulic oil in a chain arm saw hydraulic system, detected electric signals are transmitted to the PLC control module, the electric signals are converted into analog digital quantity through the PLC control module and transmitted to the man-machine display module to be displayed, the PLC control module is electrically connected with a heater and a cooler aiming at the change of the oil temperature, when the PLC control module judges that the oil temperature is lower than or higher than an allowable range value according to the detected oil temperature data, the heater or the cooler is correspondingly controlled to heat or cool the oil temperature, the heater mainly adopts but not limited to a resistance wire, the cooler mainly adopts but not limited to a cooling fan, the PLC control module converts a 4-20mA current value obtained by the oil temperature sensor into temperature data, and then automatically turns on or off the hydraulic oil cooling fan according to the temperature data, or a hydraulic oil heating resistance wire is connected to perform cooling or heating action of hydraulic oil, the liquid level detection sensor is used for detecting the liquid level of the hydraulic oil in the chain arm saw hydraulic system, the detected electric signal is transmitted to the PLC control module, the analog digital quantity is converted by the PLC control module and is transmitted to the man-machine display module to be displayed, the PLC control module monitors the low-level state of the hydraulic oil through the switching signal of the liquid level detection sensor, and program shutdown is performed when the signal is ON.
The PLC control module is also electrically connected with an oil return pressure sensor and used for detecting the pressure in a chain arm saw hydraulic pipeline and conveying a detected electric signal to the PLC control module, and the liquid level state and the oil return pressure state are connected to an I/O port of the PLC control module through a switching value signal and monitored to reach an alarm point for alarm protection.
The electric control system also comprises a lubricating system, wherein the lubricating system is controlled by adopting a proportional valve and is used for lubricating a transmission structure of the chain arm saw; sending a command to a PLC control module through a human-computer interface module, opening or closing a lubricating system electromagnetic valve, and oiling and lubricating a moving element; a circuit of a hydraulic motor of the chain arm saw is provided with a thermal relay and a phase sequence protector which are used for protecting the hydraulic motor.
The electrical control system also comprises an internet of things system which is in communication with the PLC control module and the RS485 communication line, the internet of things system comprises an IOT module and a cloud platform, and the IOT module is used for receiving the operation data of the PLC control module and transmitting the operation data to the cloud platform; the purpose of remote monitoring through the cloud platform is achieved.
Referring to fig. 1, PLC control module electric connection has chain speed pulse module, swing arm angle encoder, walking speed pulse module, swing arm speed pulse module and human-computer interface module, wherein:
chain speed pulse module: a pulse signal for sensing the speed of the chain 1 of the chain arm saw;
swing arm angle encoder: a pulse signal for sensing an angular displacement of the chain arm 2 of the chain arm saw in swinging;
walking speed pulse module: the pulse signal is used for sensing the walking speed of the chain arm saw;
swing arm speed pulse module: a pulse signal for sensing the swing of the link arm 2 of the link arm saw;
a PLC control module: the device is used for receiving pulse signals of the chain speed pulse module, the swing arm angle encoder, the walking speed pulse module and the swing arm speed pulse module to obtain corresponding pulse numbers, and converting the pulse signals into linear speed values of the chain 1 and the chain arm saw walking and angular speed values of the chain arm 2 swinging; calculating the real-time swinging angle value of the chain arm 2 according to the number of received pulse signals of the angular displacement of the swing arm angle encoder and the transformation ratio of the chain arm saw speed reducer;
a human-computer interface module: the device is used for displaying the linear speed values of the chain 1 and the chain arm saw, the angular speed value of the chain arm 2 and the real-time swinging angle value of the chain arm 2, and sending a control command to the PLC control module; the PLC control module makes corresponding execution actions according to the control instructions;
the execution action comprises a preparation execution action and a work execution action, and specifically comprises the following steps:
preparing to execute actions: when the chain arm saw is in the preparation mode, the action of quickly walking the chain arm saw and the action of quickly swinging the chain arm 2 are executed;
the work execution action: and under the condition that the chain arm saw is in a working mode, the actions of slow walking of the chain arm saw and slow swinging of the chain arm 2 are executed according to the linear speed value of the chain arm saw walking, the angular speed value of the chain arm 2 swinging and the angular value of the chain arm 2 swinging, which are calculated by the PLC control module in real time, and when the chain arm saw is controlled to walk slowly, the chain arm 2 is always contacted with a cutting surface in the slow swinging cutting process.
Specifically, the method comprises the following steps: the PLC control module reads the pulse numbers of the chain speed pulse module (chain 1 speed pulse sensor), the walking speed pulse module (walking speed pulse sensor) and the swing arm speed pulse module (swing arm speed pulse sensor) through a specific high-speed pulse port, the pulse numbers are converted into the linear speed values of the walking of the chain 1 and the chain arm saw and the swing angular speed value of the chain arm 2 which are well known through program logic operation in the PLC control module, and the results are transmitted to the human-computer interface module to be displayed. The PLC control module reads the swing arm angle encoder, calculates the real-time swing angle value of the chain arm 2 according to the number of the received swing arm angle encoder pulse signals and the transformation ratio of the chain arm saw speed reducer, and sends the real-time swing angle value to the human-computer interface module for display.
The human-computer interface module sends a control instruction to the PLC control module, and the PLC control module performs program logic analysis and operation to perform an execution action; in the preparation mode, a solenoid valve for controlling the chain arm saw to walk quickly is switched on or off to execute the action of walking quickly; switching on or off an electromagnetic valve for controlling the quick swing arm of the chain arm 2 to execute the action of the quick swing arm;
in the working mode, referring to fig. 2 and 3, the proportional valve for controlling the chain arm saw to walk at a slow speed is switched on or off, and the action of walking at a slow speed is executed; switching on or switching off a proportional valve for controlling the swing arm of the chain arm 2 to execute the action of the slow swing arm; in the working mode, according to the swing angle value of the chain arm 2 obtained by the swing arm angle encoder, the pulse number of the walking speed pulse sensor and the swing arm pulse sensor is tracked in real time, referring to fig. 2, radian difference compensation is carried out in the program, the slow walking (by controlling a proportional valve) and the slow swing arm (by controlling the proportional valve) are controlled to realize compensation displacement, the compensation displacement is increased progressively along with the swing of the chain arm, and finally the final track of linear feed without dead angles is achieved, referring to fig. 3 specifically, when the chain arm saw starts to work, the chain arm 2 is parallel to the ground and is vertical to a cutting surface, in the downward swing cutting process of the chain arm 2, the chain arm 2 is gradually separated from the cutting surface, referring to fig. 4, so that dead angles (the chain arm 2 forms an included angle which can not be fed and cut with the cutting surface) exist all the time when the chain arm 2 feeds and the chain arm 2 swings slowly, referring to fig. 3, when the chain arm saw travels slowly, the chain arm 2 is always in contact with a cutting surface in the downward slow-speed swinging cutting process until the feed cutting is completed (the travel displacement of the chain arm saw during this period is the final compensation displacement), so that the chain arm 2 reaches the final straight-line feed trajectory without dead angles.
In conclusion, the PLC control module receives the sensing signals of the sensing modules and transmits the sensing signals to the human-computer interface module, so that data visualization is realized, and meanwhile, the corresponding control instructions are output through the human-computer interface to control the PLC control module to perform corresponding execution actions, so that the complexity of hardware circuits is greatly reduced in the whole electric control system, and faults are further reduced; meanwhile, a humanized dynamic visual interface enables personnel to operate more conveniently, and is simple and easy to operate; the interface data diversity gets rid of the complexity of installing various instruments.
Through chain speed pulse module, swing arm angle encoder, the pulse signal of walking speed pulse module and swing arm speed pulse module response, and under PLC control module's logical operation effect, calculate chain 1, the linear velocity value of chain arm saw walking and the wobbling angular velocity value of chain arm 2, and through the walking of PLC control module control chain arm saw and the swing action of chain arm 2, provide compensation displacement, make chain arm 2 in chain arm saw walking working process, contact with the cutting plane all the time in the chain arm 2 low-speed swing cutting process, chain arm 2 realizes no dead angle and feeds, the dead angle problem in the stone material cutting process has been solved, the lumber recovery of stone material has been improved, the waste of resource has been avoided.
Through the Internet of things system, the working data can be transmitted to the cloud end for data analysis and working parameter optimization, and program optimization and fault query processing can also be remotely performed.
It should be noted that in the foregoing description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
Claims (10)
1. An electrical control system for a chain arm saw, the electrical control system comprising: PLC control module and with PLC control module electric connection's chain speed pulse module, swing arm angle encoder, walking speed pulse module, swing arm speed pulse module and human-computer interface module, wherein:
chain speed pulse module: a pulse signal for sensing a chain speed of the chain arm saw;
swing arm angle encoder: a pulse signal for sensing an angular displacement of a chain arm swing of the chain arm saw;
walking speed pulse module: the pulse signal is used for sensing the walking speed of the chain arm saw;
swing arm speed pulse module: a pulse signal for sensing the swing of the chain arm saw;
a PLC control module: the device is used for receiving pulse signals of the chain speed pulse module, the swing arm angle encoder, the walking speed pulse module and the swing arm speed pulse module to obtain corresponding pulse numbers, and converting the pulse signals into linear speed values of the chain and the chain arm saw walking and angular speed values of the chain arm swing; calculating the real-time swinging angle value of the chain arm according to the number of received angular displacement pulse signals of the swing arm angle encoder and the transformation ratio of the chain arm saw speed reducer;
a human-computer interface module: the PLC is used for displaying a linear speed value of the chain, a chain arm saw walking, an angular speed value of the chain arm swing and an angle value of the chain arm real-time swing, and sending a control command to the PLC control module; the PLC control module makes corresponding execution actions according to the control instructions;
the execution action comprises a preparation execution action and a work execution action, and specifically comprises the following steps:
preparing to execute actions: under the condition that the chain arm saw is in a preparation mode, the action of quickly walking the chain arm saw and the action of quickly swinging the chain arm are executed;
the work execution action: and under the condition that the chain arm saw is in a working mode, the actions of slow walking and slow swinging of the chain arm saw are executed according to the linear speed value, the angular speed value and the angular value of the swinging of the chain arm, which are calculated by the PLC control module in real time, and the chain arm saw is controlled to be in contact with the cutting surface all the time in the process of slow swinging and cutting when the chain arm saw walks at a slow speed.
2. The electric control system of the chain arm saw as claimed in claim 1, further comprising a return oil pressure sensing module electrically connected to the PLC control module for detecting the pressure in the hydraulic pipeline of the chain arm saw and transmitting the detected electric signal to the PLC control module.
3. The electric control system of the chain arm saw as claimed in claim 1, further comprising a main pump pressure sensor electrically connected to the PLC control module for detecting a pressure of a main pump in the hydraulic system of the chain arm saw, transmitting a detected electric signal to the PLC control module, converting the detected electric signal into an analog digital quantity through the PLC control module, and transmitting the analog digital quantity to the man-machine display module for displaying.
4. The electric control system of the chain arm saw as claimed in claim 1, further comprising an auxiliary pump pressure sensor electrically connected to the PLC control module for detecting the pressure of the auxiliary pump in the hydraulic system of the chain arm saw, transmitting the detected electric signal to the PLC control module, converting the electric signal into analog digital quantity by the PLC control module, and transmitting the analog digital quantity to the man-machine display module for display.
5. The electric control system of the chain arm saw as claimed in claim 1, further comprising an oil temperature detecting sensor electrically connected to the PLC control module for detecting the temperature of the hydraulic oil in the hydraulic system of the chain arm saw and transmitting the detected electric signal to the PLC control module, and the electric signal is converted into analog digital quantity by the PLC control module and transmitted to the man-machine display module for display.
6. The electric control system of the chain arm saw as claimed in claim 1, further comprising a liquid level detection sensor electrically connected to the PLC control module for detecting the liquid level of the hydraulic oil in the hydraulic system of the chain arm saw, and transmitting the detected electric signal to the PLC control module, converting the electric signal into analog digital quantity by the PLC control module, and transmitting the analog digital quantity to the man-machine display module for displaying.
7. The electric control system for the chain arm saw as claimed in claim 5, further comprising a heater and a cooler electrically connected to the PLC control module, wherein when the PLC control module determines that the oil temperature is lower than or higher than the allowable range value according to the detected oil temperature data, the heater or the cooler is correspondingly controlled to heat or cool the oil temperature.
8. The electrical control system for chain arm saw as claimed in claim 7, wherein the heater is a resistance wire and the cooler is a cooling fan.
9. The electrical control system for a chain arm saw of claim 1, further comprising a lubrication system using proportional valve control for lubrication at the drive structure of the chain arm saw.
10. The chain arm saw electrical control system as claimed in claim 1, further comprising an internet of things system in communication connection with the PLC control module, wherein the internet of things system comprises an IOT module and a cloud platform, and the IOT module is used for receiving the operation data of the PLC control module and transmitting the operation data to the cloud platform.
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| CN114109383A (en) * | 2021-11-19 | 2022-03-01 | 中国铁建重工集团股份有限公司 | Chain arm top cutting machine and control method thereof |
| CN117307163B (en) * | 2023-11-27 | 2024-04-30 | 泉州华大超硬工具科技有限公司 | Electric control system and method for electrically driven plate chain arm saw |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE2709687A1 (en) * | 1977-03-05 | 1978-09-07 | Korfmann Gmbh Maschf | PROCEDURE AND CIRCUIT FOR CONTROLLING THE SCREWING POWER OF A MACHINE FOR CUTTING ROCK MATERIAL USING STONE CUTTING CHAINS |
| US7841266B2 (en) * | 2007-01-22 | 2010-11-30 | Robert Bosch Gmbh | Proximity sensor for stationary power tools |
| CN204188989U (en) * | 2014-08-25 | 2015-03-04 | 泉州华大超硬工具科技有限公司 | A kind of armed saw wireless remote control automatic electrical control system |
| CN105182901B (en) * | 2015-10-19 | 2018-03-16 | 泉州华大超硬工具科技有限公司 | A kind of liquid electricity armed saws electric control system |
| CN107825527A (en) * | 2016-07-06 | 2018-03-23 | 丁永新 | Using the electronic felling saw and its method of work of control board |
| CN111226626B (en) * | 2018-11-28 | 2022-09-16 | 南京泉峰科技有限公司 | Chain saw, electric tool, and control method for electric tool |
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