CN201848600U - Constant-power sawing control device of band sawing machine - Google Patents
Constant-power sawing control device of band sawing machine Download PDFInfo
- Publication number
- CN201848600U CN201848600U CN2010205911802U CN201020591180U CN201848600U CN 201848600 U CN201848600 U CN 201848600U CN 2010205911802 U CN2010205911802 U CN 2010205911802U CN 201020591180 U CN201020591180 U CN 201020591180U CN 201848600 U CN201848600 U CN 201848600U
- Authority
- CN
- China
- Prior art keywords
- sawing
- feeding
- tensioning
- control
- piston rod
- 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.)
- Expired - Lifetime
Links
Images
Landscapes
- Sawing (AREA)
Abstract
The utility model relates to a constant-power sawing control device of a band sawing machine. The existing sawing control device can not adjust the sawing feed speed according to the variation of sawing load. The device comprises a feed displacement sensor, a tensioning displacement sensor, a control circuit and a proportional direction valve. The feed displacement sensor is arranged in a feed hydraulic cylinder of the band sawing machine; the tensioning displacement sensor is arranged in a tensioning hydraulic cylinder of the band sawing machine; signal output terminals of the feed displacement sensor and the tensioning displacement sensor are respectively connected with an A/D sampling module in the control circuit; and the signal output terminal of the control circuit is connected with the signal input terminal of the proportional direction valve. The device realizes the non-contact detection of a band saw blade under sawing load, and can realize the real-time feedback of the sawing load of the band saw blade during the sawing process; and both the practicability and the reliability of non-contact detection are better than those of direct detection.
Description
Technical field
The utility model belongs to the control technology field, relates to the permanent power SAWING CONTROL of a kind of band sawing machine device.
Background technology
Band sawing machine is a kind of as sawing machine, be a kind of by bands for band as instrument, be widely used in sawing ferrous metal, non-ferrous metal, the lathe of nonmetallic materials occasion.The system of band sawing machine forms to be had: lathe bed and column part, saw frame and according to band running part, tensioning portion, targeting part, workpiece clamping part, Hydraulic Power Transmission System, electric control system, lubricated and cooling system.The sawing feed system of band sawing machine is made up of Hydraulic Power Transmission System control and electric control system.The hydraulic circuit that Hydraulic Power Transmission System is made up of first auxiliaries such as pump, valve, oil cylinder, fuel tank, pipelines, the control loop that electric control system is made up of electric box, control cabinet, terminal box, travel switch, electromagnet etc.The sawing feeding of band sawing machine is to be finished under the control of electric drive system by Hydraulic Power Transmission System, and the feeding parameter is set according to the sawing material by operating personnel in advance, and Hydraulic Power Transmission System is carried out work under the feeding parameter.
The sawing feed control method of existing band sawing machine mainly contains constant speed feed and variable-speed feeding speed.Constant speed feed relies on the band sawing machine self gravitation or the given signal of Hydraulic Power Transmission System is realized.Wherein the deficiency of Cun Zaiing is not consider the sudden change of sawing load, and variable-speed feeding speed can be adjusted feed speed according to the variation of sawing load.Band sawing machine sawing feed control device has the hydraulic pressure open ring control device, 2 support reaction feedback devices of bands for band.The hydraulic pressure open ring control device has only been considered and has been satisfied the feeding requirement, do not considered the changeability of sawing load in the feeding process.2 support reaction feedback devices of bands for band carry out band sawing machine feeding control by detecting the sawing load that is subjected on the bands for band, the support reaction feedback device is owing to need and bands for band moment in high-speed cruising keeps in touch, time has been grown and will produce wearing and tearing, influences accuracy of detection.Patent publication No. be the CN86200216 patent related for having the band sawing machine of permanent centripetal force mechanism, it is by a hydraulic jack and a band sawing machine saw frame joggleword with constant voltage, provide constant substantially sawing pressure to workpiece, this method does not detect the size of sawing load, and complicated in mechanical structure.
Summary of the invention
The utility model provides the permanent power SAWING CONTROL of a kind of band sawing machine device at the deficiencies in the prior art.This device is realized the real-time feedback of the suffered sawing load of sawing process bands for band by the displacement detecting of bands for band hydraulic tensioning cylinder; By having the sawing feed controller of pid control algorithm, the result according to actual sawing load feedback and setting sawing load are compared regulates the proportioning valve flow of sawing feed speed, thereby realizes the constant control of sawing load (permanent power) of sawing process.
The technical scheme that the utility model technical solution problem is adopted is:
The permanent power SAWING CONTROL of a kind of band sawing machine device comprises feeding displacement transducer, tensioning displacement transducer, control circuit and proportional reversing valve.
The feeding displacement transducer is arranged in the feeding hydrocylinder of band sawing machine, the tensioning displacement transducer is arranged in the hydraulic tensioning cylinder of band sawing machine, the signal output part of feeding displacement transducer, tensioning displacement transducer signal output part be connected with A/D sampling module in the control circuit respectively, the signal output part of control circuit is connected with the signal input part of proportional reversing valve.
Described feeding displacement transducer adopts magnetostrictive displacement sensor, and the measuring staff of magnetostrictive displacement sensor stretches in the piston rod of feeding hydrocylinder and with the feeding piston rod and flexibly connects; The afterbody of feeding piston rod is provided with first magnet ring, described first magnet ring, feeding piston rod and the coaxial setting of measuring staff.
Described tensioning displacement transducer adopts magnetostrictive displacement sensor, and the measuring staff of magnetostrictive displacement sensor stretches in the piston rod of hydraulic tensioning cylinder and with the tensioning piston rod and flexibly connects; The afterbody of tensioning piston rod is provided with second magnet ring, described second magnet ring, tensioning piston rod and the coaxial setting of measuring staff.
Described control circuit comprises A/D sampling module, control module, D/A modular converter.The A/D sampling module carries A/D sampling power supply, and the output of A/D sampling module is connected with the I/O mouth signal of control module; The I/O mouth of control module, control end are connected with D/A modular converter signal; The output of D/A modular converter is as the signal output part of control circuit; Control circuit also comprises display module.
The first oil circuit control end of described proportional reversing valve, the second oil circuit control end are imported and exported with two oil circuits of feeding hydrocylinder respectively and are connected; The oil-in of proportional reversing valve is divided into two-way, and one the tunnel is communicated with oil sources through check valve, oil pump, filter, and another road is communicated with oil sources behind overflow valve; The oil return opening of proportional reversing valve directly is communicated with oil sources.
The utility model has following beneficial effect than prior art: compare and directly detect the sawing load that bands for band is subjected to, the utility model is by the displacement detecting of bands for band hydraulic tensioning cylinder, realized bands for band is subjected to the non-contact detecting of sawing load, and can realize the real-time feedback of the suffered sawing load of sawing process bands for band, practicality and reliability are all better than direct detection.The utility model is according to actual sawing load feedback and set the result that the sawing load is compared, the calculating of the sawing feed controller by having pid control algorithm, regulate the proportioning valve flow of sawing feed speed, thereby realize the constant control of sawing load (permanent power) of sawing process, the most tangible benefit is exactly to have prolonged the life-span of having improved bands for band.
Description of drawings
Fig. 1 is the control procedure schematic diagram;
Fig. 2 is the band sawing machine side view;
Fig. 3 is the band sawing machine front view;
Fig. 4 is the sensor installation diagram;
Fig. 5 is the control circuit theory diagram;
Fig. 6 is a control circuit A/D module circuit diagram;
Fig. 7 is a control circuit D/A module circuit diagram;
Fig. 8 is a control circuit display module circuit diagram.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
The permanent power SAWING CONTROL of a kind of band sawing machine device comprises feeding displacement transducer, tensioning displacement transducer, control circuit and proportional reversing valve.The feeding displacement transducer is arranged in the feeding hydrocylinder of band sawing machine, and the tensioning displacement transducer is arranged in the hydraulic tensioning cylinder of band sawing machine.
As shown in Figure 1, the control procedure of the permanent power SAWING CONTROL of band sawing machine device is as follows: at first the operator is according to sawing material accommodation zone sawing machine hydraulic tensioning cylinder, the hydraulic tensioning cylinder displacement signal displacement transducer collection that is tensioned of this moment, and described displacement signal is made as reference signal r (t).Band sawing machine is started working then, continuous variation along with the sawing load, the tensioning displacement transducer is constantly gathered the displacement signal of hydraulic tensioning cylinder, and this displacement signal is made as feedback signal c (t), after feedback signal c (t) and reference signal r (t) compare, produce deviation signal e (t), e (t) is by having the sawing feeding control circuit output control signal u (t) of PID controller algorithm, scale parameter in the control circuit, integral parameter, differential parameter is regulated according to band sawing machine real work situation.Control signal u (t) control ratio reversal valve, the opening of adjusting proportional reversing valve.Proportional reversing valve output flow q (t) regulates the displacement y (t) of feeding hydrocylinder, thereby controls moving up and down of band sawing machine.The feeding displacement y (t) of band sawing machine changes the variation that causes the suffered sawing load F (t) of band sawing machine, the variation of the sawing load F (t) that band sawing machine is suffered causes the variation of the required tensile force of band sawing machine, thereby cause the variation of hydraulic tensioning cylinder displacement, this moment hydraulic tensioning cylinder Displacement Feedback signal c (t) just and setting signal r (t) produced deviation, feedback signal c (t) continuation and reference signal r (t) compare and carry out the control of next round.
As shown in Figure 2, the signal output part A of the signal output part of feeding displacement transducer 1, tensioning displacement transducer is connected with A/D sampling module 4 in the control circuit respectively, and the D/A module by signal output 3 of control circuit is connected with the signal input part of proportional reversing valve 2.Feeding displacement transducer 1 adopts magnetostrictive displacement sensor, and magnetostrictive displacement sensor is installed in the afterbody of feeding hydrocylinder.
The first oil circuit control end A1 mouth of proportional reversing valve 2, the second oil circuit control end B1 mouth are imported and exported with two oil circuits of feeding hydrocylinder respectively and are connected; The oil-in of proportional reversing valve 2 is divided into two-way, and one the tunnel is communicated with oil sources through check valve, oil pump, filter, and another road is communicated with oil sources behind overflow valve; The oil return opening of proportional reversing valve 2 directly is communicated with oil sources.
As shown in Figure 3, tensioning displacement transducer 10 adopts magnetostrictive displacement sensor, and the hydraulic tensioning cylinder of band sawing machine is connected with guide plate 6, and belt wheel and motor, bearing are contained on the guide plate 6.Four protruding shaft portions of guide plate 6 are extend in four guide seats 5, and four guide seats 5 are by on the bolting saw frame.Hydraulic tensioning cylinder 9 connected with being connected by middle gudgeon of saw frame, to support bottom end cover earlier by being bolted on the saw frame, middle gudgeon with hydraulic tensioning cylinder 9 extend in the support bottom end cover again, to support then in the middle gudgeon that upper end cover extend into hydraulic tensioning cylinder 9, will support upper end cover again and support bottom end cover and be connected by bolt.Earrings 8 is equipped with at the top of hydraulic tensioning cylinder 9, and earrings 8 is connected with earrings bearing 7 by bearing pin, and earrings bearing 7 is bolted on the guide plate 6 by four.The output line A of tensioning displacement transducer 10 is connected by the analog input end INA1 of the analog-digital converter AD7665 of comparator LM393 and controller.
As shown in Figure 4, tensioning displacement transducer above-mentioned and the feeding displacement transducer concrete installation details in hydraulic cylinder is as follows, and the measuring staff 11 of magnetostrictive displacement sensor stretches in the piston rod 12 of hydraulic tensioning cylinder and with tensioning piston rod 12 and flexibly connects; The afterbody of tensioning piston rod 12 is provided with magnet ring 13, described magnet ring 13, tensioning piston rod 12 and measuring staff 11 coaxial settings.Measuring staff 11 afterbodys of magnetostrictive displacement sensor are the parts 14 that is threaded, and the part that is threaded 14 is installed in the installing hole of hydraulic tensioning cylinder or feeding hydrocylinder afterbody.
As shown in Figure 5, in the control circuit theory diagram, controller adopts the STC11F32XE chip, the A/D modular converter adopts the AD7655 chip, the D/A modular converter adopts the DA0832 chip, display module is made up of two four LED charactron, is used to show hydraulic tensioning cylinder shift value and feeding hydrocylinder velocity amplitude.The keyboard input module is used for the startup of control device, stops and resetting.The output line A of hydraulic tensioning cylinder sensor is connected controller by one road A/D module respectively with the output line B of feeding hydrocylinder sensor, the output signal of controller is by output current signal after the D/A module, and current signal transforms voltage signal control ratio reversal valve through overdrive circuit again.
As shown in Figure 6, the A/D module is finished by chip AD7655, and AD780 provides stable 2.5V power supply.Be connected with the analog input end INA1 of AD7655 behind the hydraulic tensioning cylinder displacement input signal A process LM393 comparator, be connected with the analog input end INA2 of AD7655 behind the feeding hydrocylinder displacement input signal B process LM393 comparator.AD7655 is through after changing, and to controller output signal, output signal is finished by port D0～D15, and port D0～D15 of AD7655 connects the P0 of controller respectively, and the P2 mouth amounts to 16 ports.AD7655 needs 5 control signal wires in the process of conversion, they are respectively: input signal is selected A0, A/D conversion start bit, position
A/D EOC state flag bit
Output data upstate flag bit BUSY and data output channel are selected the position
Input signal is selected position A0, because AD7655 is 4 passage A/D converters, can import the two-way analog signal simultaneously, be expressed as INA1, INB1, INA2, INB2 at chip internal, input signal when to select a position A0 be low level INA1, INB1 two-way analog signal be input to the A/D conversion chip, when A0 was high level, INA2, INB2 two-way analog signal were input to the A/D switching signal.Input signal is selected the control of the controlled device P3.7 of position A0.After input signal selects the position to determine, controller will send the beginning conversion command to AD7655 by pin, promptly by P3.5 to AD7655's
Send control command, when
During for low level, AD7655 begins the A/D conversion, because AD7655 has gathered two paths of signals simultaneously, AD7655 will change the data of gathering at twice, and each data transaction finishes the pin of AD7655
Low level state just appears one time, controller can be monitored transition status by P3.3, when the two-way analog signal of gathering all behind the EOC, be that data are in available state, this moment, low level appearred in the BUSY pin of AD7655, and the BUSY pin is a high level state in the process of data transaction, and controller will read the state of data transaction by P3.4, when the data that read just can read the signal transformation result in the controller when being low level.Because when being low level, there is the transformation result of two-way analog signal in the data register inside of AD7655 at BUSY, so must select reading data in process of reading, controller can be by P4.4 to AD7655's
Pin sends the output data select signal, as P4.4 when being low level, will read the data of B passage, on the contrary, when P4.4 is high level, will read the signal of A channel.In reading the process of data, controller will be by the P3.6 pin to AD7655's
Pin sends and reads data command, just can carry out reading of data.
As shown in Figure 7, controller adopts chip STC11F32XE, and the D/A module is finished by chip DAC0832.The P1 mouth of controller connects data input port DI0～DI7 of DAC0832, and DAC0832 adopts single buffering method to connect, and the P3.2 of controller connects the sheet choosing end of DAC0832
Be used for beginning or stop the D/A conversion.Behind the D/A EOC, the IOUT1 of DAC0832 and IOUT2 output current signal, current signal is exported 0～10V Control of Voltage proportional reversing valve C of output after being converted into voltage behind the LM393.The P4.5 mouth of controller, P4.6 mouth, P4.7 mouth connect three buttons respectively, and the startup of implement device stops and resetting.
As shown in Figure 8, display module is made up of a 74LS138 decoder chip and a shift register 74HC164 chip and two LED charactrons, LED charactron D, E can show four 0～9 numeral, LED charactron D is used to show the hydraulic tensioning cylinder displacement, and LED charactron E is used to show feeding hydrocylinder speed.The A of 74LS138 decoder, B, the C mouth connects the P4.3 of controller respectively, P4.2, P4.1 mouth.4 sections that are used to show the LED charactron D of hydraulic tensioning cylinder displacement select pin to connect the Y0～Y3 of 74LS138 decoder, are used to show that 4 sections of the LED charactron E of feeding hydrocylinder displacement select pin to connect the Y4～Y7 of 74LS138 decoder.Y0～Y7 is used for 8 positions of LED charactron are selected.The P3.0 mouth of controller connects the data input pin A1 of shift register 76HC164, and the A2 mouth is used for providing serial data to shift register 74HC164.The P3.1 mouth of controller connects the CLOCK end of shift register 74HC164, be used for providing the shift pulse signal to shift register 74HC164, the P4.0 mouth of controller connects the RESET port of shift register 74HC164, and shift register 74HC164 is carried out reset operation.8 sections of LED charactron select pin to connect the parallel data delivery outlet Q end of shift register 74HC164 respectively, are used to receive the data that controller is exported.
Claims (1)
1. the permanent power SAWING CONTROL of a band sawing machine device comprises feeding displacement transducer, tensioning displacement transducer, control circuit and proportional reversing valve, it is characterized in that:
The feeding displacement transducer is arranged in the feeding hydrocylinder of band sawing machine, the tensioning displacement transducer is arranged in the hydraulic tensioning cylinder of band sawing machine, the signal output part of feeding displacement transducer, tensioning displacement transducer signal output part be connected with A/D sampling module in the control circuit respectively, the signal output part of control circuit is connected with the signal input part of proportional reversing valve;
Described feeding displacement transducer adopts magnetostrictive displacement sensor, and the measuring staff of magnetostrictive displacement sensor stretches in the piston rod of feeding hydrocylinder and with the feeding piston rod and flexibly connects; The afterbody of feeding piston rod is provided with first magnet ring, described first magnet ring, feeding piston rod and the coaxial setting of measuring staff;
Described tensioning displacement transducer adopts magnetostrictive displacement sensor, and the measuring staff of magnetostrictive displacement sensor stretches in the piston rod of hydraulic tensioning cylinder and with the tensioning piston rod and flexibly connects; The afterbody of tensioning piston rod is provided with second magnet ring, described second magnet ring, tensioning piston rod and the coaxial setting of measuring staff;
Described control circuit comprises A/D sampling module, control module, D/A modular converter, the A/D sampling module carries A/D sampling power supply, the output of A/D sampling module is connected with the I/O mouth signal of control module, the I/O mouth of control module, control end are connected with D/A modular converter signal, the output of D/A modular converter is as the signal output part of control circuit, and control circuit also comprises display module;
The first oil circuit control end of described proportional reversing valve, the second oil circuit control end are imported and exported with two oil circuits of feeding hydrocylinder respectively and are connected; The oil-in of proportional reversing valve is divided into two-way, and one the tunnel is communicated with oil sources through check valve, oil pump, filter, and another road is communicated with oil sources behind overflow valve; The oil return opening of proportional reversing valve directly is communicated with oil sources.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205911802U CN201848600U (en) | 2010-11-02 | 2010-11-02 | Constant-power sawing control device of band sawing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205911802U CN201848600U (en) | 2010-11-02 | 2010-11-02 | Constant-power sawing control device of band sawing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201848600U true CN201848600U (en) | 2011-06-01 |
Family
ID=44091013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205911802U Expired - Lifetime CN201848600U (en) | 2010-11-02 | 2010-11-02 | Constant-power sawing control device of band sawing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201848600U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102063086A (en) * | 2010-11-02 | 2011-05-18 | 杭州电子科技大学 | Constant power saw cutting control device of band sawing machine |
| CN103658850A (en) * | 2013-12-03 | 2014-03-26 | 苏州赛特尔集团机械有限公司 | Novel secondary power supply loop of automatic band sawing machine |
| CN104227500A (en) * | 2013-06-06 | 2014-12-24 | 科伊罗财产有限及两合公司电子数据处理-服务两合公司 | Sawing machine and method for controlling a sawing machine |
| US20150321274A1 (en) * | 2014-05-07 | 2015-11-12 | Keuro Besitz Gmbh & Co. Edv-Dienstleistungs Kg | Sawing machine and method for controlling a sawing machine |
| CN108020479A (en) * | 2017-11-21 | 2018-05-11 | 湖南泰嘉新材料科技股份有限公司 | A kind of sawing simulation test device and test method |
-
2010
- 2010-11-02 CN CN2010205911802U patent/CN201848600U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102063086A (en) * | 2010-11-02 | 2011-05-18 | 杭州电子科技大学 | Constant power saw cutting control device of band sawing machine |
| CN102063086B (en) * | 2010-11-02 | 2012-06-27 | 杭州电子科技大学 | Constant power saw cutting control device of band sawing machine |
| CN104227500A (en) * | 2013-06-06 | 2014-12-24 | 科伊罗财产有限及两合公司电子数据处理-服务两合公司 | Sawing machine and method for controlling a sawing machine |
| US11007587B2 (en) | 2013-06-06 | 2021-05-18 | KEURO Besitz GmbH & Co. EDV-Dienstleistimgs KG | Sawing machine and method for controlling a sawing machine |
| CN103658850A (en) * | 2013-12-03 | 2014-03-26 | 苏州赛特尔集团机械有限公司 | Novel secondary power supply loop of automatic band sawing machine |
| CN103658850B (en) * | 2013-12-03 | 2016-08-17 | 苏州中拓专利运营管理有限公司 | Novel current supply circuit of automatic band sawing machine |
| US20150321274A1 (en) * | 2014-05-07 | 2015-11-12 | Keuro Besitz Gmbh & Co. Edv-Dienstleistungs Kg | Sawing machine and method for controlling a sawing machine |
| US10596645B2 (en) * | 2014-05-07 | 2020-03-24 | Keuro Besitz Gmbh & Co. Edv-Dienstleistungs Kg | Sawing machine and method for controlling a sawing machine |
| CN108020479A (en) * | 2017-11-21 | 2018-05-11 | 湖南泰嘉新材料科技股份有限公司 | A kind of sawing simulation test device and test method |
| CN108020479B (en) * | 2017-11-21 | 2020-08-25 | 湖南泰嘉新材料科技股份有限公司 | Saw cutting simulation test device and test method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102063086B (en) | Constant power saw cutting control device of band sawing machine | |
| CN201848600U (en) | Constant-power sawing control device of band sawing machine | |
| CN101598232B (en) | Electro-hydraulic driver of control valve | |
| CN102182729B (en) | Large-flow high-frequency response electrohydraulic vibration device based on parallel servo valves and control method | |
| CN109654074A (en) | A kind of construction machinery hydraulic system | |
| CN102615350B (en) | Automatic deviation correcting device of metal band saw blade | |
| CN102886917B (en) | Hydraulic servo control system for efficiently improving pressing precision of powder-forming hydraulic machine | |
| CN101392771A (en) | Hydraulic double cylinder or multi-cylinder synchronous control system | |
| CN101402230B (en) | Top pin pressure control method and control system for internal mixing machine | |
| CN103615436A (en) | Numerical control electric-hydraulic proportioning system of steel tube straightening machine | |
| CN202091298U (en) | Bulk flow and high frequency response electrohydraulic vibrating device based on parallel connection of servo valves | |
| CN105909577B (en) | A kind of quick tensioning hydraulic station | |
| CN104999695A (en) | Electro-hydraulic control system capable of achieving ultralow-speed stable running of hydraulic machine | |
| CN100533099C (en) | Test bench for automatic gear box control valve of automobile | |
| CN105499549A (en) | Control system and control method for automatic quantitative casting of copper anode plate | |
| CN201344166Y (en) | Device for driving and controlling precise travel of hydraulic cylinder | |
| CN202533815U (en) | Intelligent tensioner | |
| CN203488483U (en) | Hydraulic system used for closed loop position control | |
| CN201865654U (en) | Automatic return control device of rotary drilling machine | |
| CN103420095A (en) | Multi-motor power balancing system and method for variable-speed-device-driven belt conveyor | |
| CN203614479U (en) | Tundish lifting hydraulic device with high synchronization accuracy | |
| CN201650894U (en) | Controllable high pressure and large flow generating device | |
| CN102485393A (en) | Cutting machine speed control system | |
| CN202851161U (en) | Device for control of real-time speed adjustment of forklift dynamical system | |
| CN202480353U (en) | Energy-saving control system of injection molding machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110601 Effective date of abandoning: 20120627 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20110601 Effective date of abandoning: 20120627 |