CN101270670A - Front and back opening/closing split type self-controllable power throttle - Google Patents
Front and back opening/closing split type self-controllable power throttle Download PDFInfo
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- CN101270670A CN101270670A CNA200610079651XA CN200610079651A CN101270670A CN 101270670 A CN101270670 A CN 101270670A CN A200610079651X A CNA200610079651X A CN A200610079651XA CN 200610079651 A CN200610079651 A CN 200610079651A CN 101270670 A CN101270670 A CN 101270670A
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Abstract
An automatic split impetus air door that can be opened on both front and back sides is characterized in that two air doors are interlinked by a crank arm and a connecting rod that can be opened or closed on both front and back sides, so acting force on two air doors produced by air current is balanced out, thus decreasing power required by opening and closing the air door and preventing impact on the air door caused by the air current when the air door is closed. As a result, the air door can run steadily and the installation orientation of the air door is not restrained. Moreover, the structure of the air door does not need to be changed when the air current varies. The invention designs two kinds of power for driving the air door, one of which adopts winch driving and the other of which adopts the linear motion mechanical driving of hydraulic cylinder. A power unit driven by the winch adopts a swing stander and gravity-setting-up overload protection structure. The power unit driven by the linear motion mechanism adopts a spring gear protector. The automatic split impetus air door has simple structure, sensitive protection and reliable operation and is very in favor of adopting automatic control.
Description
Technical field
The present invention relates to a kind of ventilation or the air door of distinguished and admirable distribution and device of automatic open and close air door that is used for mine or tunnel.
Background technology
The OBD of conventional art, because the opening direction of its air door is only opened to the direction of inverted air current, so when air door is closed or has just been opened, its distinguished and admirable active force that it is formed is bigger, if especially do not adopt corresponding impact mitigation measure also to be accompanied by very big impact force when closing air door.Therefore, all make push-pull structure for bigger air door in the prior art, to solve the ill-effect that distinguished and admirable active force produces its transmission mechanism, the power air door or the automatic power air door of controlling that adopt power to drag seldom adopt the opposite opened structure.Adopt pneumatic or hydraulicdriven air door all to adopt the overload protection of pressure limiting valve in addition in the prior art as air door and transmission mechanism thereof; and all adopt the mode of overcurrent protection that it is carried out overload protection for the power air door that adopts electric-motor drive; because these protections all are the protected modes of indirectly-acting; its protection process is slow in reacting; and because the fault rate of its protective device self is higher; so the reliability of protection is relatively poor; particularly for the overload protection of motor; because the control capacity of the flame-proof type magnetic starter (being explosion-proof switch) that uses under the coal mine is all bigger at present; and the power of electric motor that adopts on the air door is very little; generally all at 2KW between the 7.5KW; so these jumbo switches can't effectively be protected these low power motors at all; so the fault of motor often occurs burning out; if and big power of electric motor choosing; this just means that motor drags the increasing of ability; even if motor has been implemented destruction to air door and transmission mechanism; motor can not transship yet, so can not effectively protect system too.And adopting the plug-type air door of cylinder or hydraulic cylinder transmission because the stroke of its piston rod is long, its piston rod is very easy to buckling failure, also occurs leakage failure easily.And for above-mentioned reasons, the automaticity of coal mine lower wind door is not high at present, even if used automation, because its fault is many, its normal operation ratio is also lower, and maintenance capacity is bigger.
Summary of the invention
Technical problem to be solved by this invention is that a kind of opposite opened self-controllable power air door of front-and-back opening-closing is provided.The feature of this air door is:
First, be in air door structure, to have adopted the curved arm rod link gear, the doorframe that both frame (4) and crossbeam (5) had been connected and composed air door is embedded on the tunnel, left and right sides air door (1) (2) is hinged by hinge (3) and frame (4), left and right door crank arm (6) (7) respectively with about the upper end of two air doors (1) (2) fix, its hinged end is hinged by bearing pin and connecting rod (8) again, and is connected with the air door power set at the crank arm hinged end of (6) (7) of right air door or left air door.Crank arm and air door when rotating when power set drag one of them, connecting rod (8) also drives another simultaneously and cranks arm and do identical rotation with air door, makes the both direction unlatching forwards, backwards or close respectively of its two pectinids door.So, no matter which kind of position two pectinid doors are in, its distinguished and admirable active area to two pectinid doors all equates, but it is distinguished and admirable just in time opposite to the formed active force of air door transmission, just in time the formed active force of air door transmission system is cancelled out each other distinguished and admirable, so for the unlatching of air door or close and just only be left the conduct oneself with dignity frictional resistance of formed inertia force and air door transmission of air door for the resistance that is constituted, this has just reduced to drag the required power of air door greatly, and avoided the impact of wind-force, made the operation process of air door become very steady air door.
The second, be that the power set and the overload protection arrangement of air door have been implemented brand-new supporting design.The present invention has designed two kinds of power set for it, and a kind of is the power set that driven by the capstan winch driving machine, and another kind is the power set that driven by straight line driving; So-called capstan winch driving machine is the driving device of driving style exactly with the capstan winch lay winding wire ropes, and this machinery both can be made of motor and reductor, also can be hydraulic motor or gas motor; So-called straight line driving, the rectilinear motion by bar class driving member is the driving device of driving style exactly, this machinery both can be cylinder, hydraulic cylinder, Electrohydraulic push rod, also can be the dynamic power machine that is made of screw machanism or rackwork.
Be that its power set that open and close air door are to be made of jointly weight energy storage device that is located at the air door left side and the capstan driving device that is located at the air door right side with the power set of capstan winch driving machine driving and the feature of overload protection arrangement; The closing motion of its air door is finished by the weight energy storage device that is located at the air door left side; its action of opening the door is finished by the capstan driving device that is located at the air door right side; and frame is designed to swing type; carry device with pouring weight or the following pressing spring (20) that is located at the frame lower left as the accent that opens the door; constitute the overload protection that opens the door with overload limit switch (21) acting in conjunction of opening the door, its overload protection of closing the door is then finished by micro limit switch (19) and the spacing fork of slack rope (15).
Power set so that straight line driving drives is characterized in that having set up the spring limit for tonnage protective device (28) that the present invention invented at the fixed end of straight line driving (26).
The 3rd, be for air door has designed reliable self-con-tained unit, it is characterized in that, on right air door, be provided with high-order light sensor (22) and low level light sensor (23), and be provided with door open limit switch (24) in a side of lane wall, on crossbeam (5), be provided with and close door limit switch (25).Its automatically control by light sensor (22) (23), door open limit switch (24), close door limit switch (25), air door power set and corresponding limit for tonnage protective device and microcomputor program and cooperatively interact and finish.Certainly, the sensing mode of air door automatic control also has infrared rays, ultrasonic wave, radar etc., but still convenient with photosensitive control for this applied environment of underground air door by contrast, becomes optimum implementation of the present invention.
The invention has the beneficial effects as follows:
1, distinguished and admirable active force to the air door transmission is cancelled out each other, and has reduced to drag the power of air door greatly.
2, eliminated and distinguished and admirable air door has been closed the impact force of formation, made the process of damper movement steady.
3, owing to distinguished and admirable active force to the air door transmission is cancelled out each other,, when distinguished and admirable changing direction, also need not to change any structure of air door so the installation direction of air door is not influenced by wind direction yet.
4, the overload protection that adopts gravity or spring and limit switch to cooperatively interact and constitute, simple in structure, be active in one's movements, protect reliably.
5, compare the length that push-and-pull throttle has shortened cylinder body and piston rod greatly.
6, general structure is simple and reliable, is easy to cooperate microcomputor program to realize control automatically.
7, in the power set that the capstan winch driving machine drives, the capstan driving device that removes the air door right side promptly can be changed into and opens Door by Hand, the applied in any combination that the unpowered semi-automatic air door that weight is closed the door automatically, its air door structure can be numerous or simple according to user's request.
Description of drawings
Accompanying drawing 1: be to be the structure chart of the power air door of power set with the capstan winch driving machine.
Accompanying drawing 2: be to be the part figure of transmission mechanism of power air door of power set and the enlarged drawing of spring limit for tonnage protective device with the straight line driving.
The specific embodiment
The opposite opened self-controllable power air door of front-and-back opening-closing of the present invention is characterized in that, this air door by left air door (1), right air door (2), hinge (3), frame (4), crossbeam (5), left-hand door crank arm (6), right door is cranked arm (7) and air door power set formation; Frame (4) is embedded on the tunnel with the doorframe that crossbeam (5) connects and composes air door, left and right sides air door (1) (2) is hinged by hinge (3) and frame (4), left and right door crank arm (6) (7) respectively with about the upper end of two air doors (1) (2) fix, its hinged end is hinged by bearing pin and connecting rod (8) again, and is connected with the air door power set at the crank arm hinged end of (6) (7) of right air door or left air door.Crank arm and air door when rotating when power set drag one of them, connecting rod (8) also drives another simultaneously and cranks arm and do identical rotation with air door, makes the both direction unlatching forwards, backwards or close respectively of its two pectinids door.
The present invention has designed two kinds of power set for this air door, and a kind of is the power set that driven by the capstan winch driving machine, and another kind is the power set that driven by straight line driving; So-called capstan winch driving machine is the driving device of driving style exactly with the capstan winch lay winding wire ropes, and this machinery both can be made of motor and reductor, also can be hydraulic motor or gas motor; So-called straight line driving, the rectilinear motion by bar class driving member is the driving device of driving style exactly, this straight line driving both can be cylinder, hydraulic cylinder, Electrohydraulic push rod, also can be the dynamic power machine that is made of screw machanism or rackwork.
Be that its power set that open and close air door are to be made of jointly weight energy storage device that is located at the air door left side and the capstan driving device that is located at the air door right side with the power set of capstan winch driving machine driving and the feature of overload protection arrangement; Its weight energy storage device is made of weight string (11), left fixed pulley (9) and weight wire rope (12), and an end of its wire rope is contacted with weight and connect, and the other end passes crank arm with the left-hand door hinged end of (6) of left fixed pulley (9) and is connected; The capstan driving device on right side is by right fixed pulley (10), haulage cable (16), capstan winch (14), capstan winch driving machine (13), swing frame (18), frame bearing (17), balancing weight or pressing spring (20), the overload of opening the door limit switch (21), micro limit switch (19), the spacing fork of slack rope (15) constitute down; Frame bearing (17) is fixed with the tunnel, the right-hand member and the frame bearing (17) of swing frame (18) are hinged, the left end of swing frame is supported on the roadway floor, be provided with balancing weight or following pressing spring (20) in the bottom of swing frame left end, capstan winch driving machine (13) is fixed on the swing frame (18), capstan winch (14) is installed on the output shaft of capstan winch driving machine, the lower end of wire rope (16) is wrapped on the capstan winch (14), the upper end is passed right fixed pulley (10) and is connected with the hinged end of right crank arm (7), the overload limit switch (21) that opens the door is installed in the top of swing support, the upper end of the spacing fork of slack rope (15) is enclosed within on the haulage cable (12), and lower end and micro limit switch (19) form interlock.Under normal circumstances, swing frame (18) can not be swung under the effect of balancing weight or following pressing spring (20), only damper movement is obstructed when opening the door, make the tractive force that opens the door surpass after the setting power of balancing weight or following pressing spring (20), swing frame (18) just can upwards be swung and be triggered overload limit switch (21) action of opening the door, stop capstan winch driving machine (13) and rotate, realize opening the door overload protection; If air door is obstructed in closing movement; capstan winch (14) continues counter-rotating, and haulage cable (16) is lax sagging, and its gravity can press down the spacing fork of slack rope (15) and make micro limit switch (19) action; stop capstan winch driving machine (13) and rotate, realize closing the door overload protection.
Above-mentioned power set also can be simplified its structure according to user's needs, for example, remove the capstan driving device on air door right side, have just constituted to open Door by Hand the semi-automatic air door that weight is closed the door automatically; Also swing frame (18), frame bearing (17), balancing weight or following pressing spring (20), the overload of opening the door limit switch (21), micro limit switch (19), the spacing fork of slack rope (15) can be removed, and directly be fixed on capstan winch driving machine (13) on the tunnel, set up the control corresponding button again, just can constitute the power air door that manual control capstan winch driving machine drives.
With the power set that straight line driving drives, the hinged end hinge joint of the flexible end of its straight line driving (26) and crank arm (7), its fixed end can be directly hinged with bearing (27), constitutes the power air door of manually controlling the straight line driving driving; Also can pass through terminal pad (29) is connected with spring limit for tonnage protective device (28); again that cross axle on the spring limit for tonnage protective device (28) and bearing (27) is hinged, constitute the power air door of controlling automatically and realizing the straight line driving driving of automatic overload protection.
Spring straight line driving of the present invention (28) is the limit for tonnage protective device that aims at the straight line driving design, and this device draws spring (34), limit to push away spring (35), front and back flange (33) (32), touch panel (37), stretching limit switch (36), pushing tow limit switch (38) formation by spring strut (30), expansion link (31), limit; Expansion link (31) is installed in the spring strut (30), the middle part of expansion link is processed with the shaft shoulder, being respectively charged into limit in the both sides of the shaft shoulder draws spring (34) and limit to push away spring (35), front and back flange (33) (32) are fixed with the flange of spring strut (30) rear and front end respectively, touch panel (37) adopts the rear end that is bolted to expansion link, limit switch (36), (38) are separately fixed at the both sides, front and back of touch panel (37) by support, and its support are fixed on the rear end of spring strut.Expansion link under normal load (31) may be motionless or fine motion following of the restriction of its spring (34) and (35); only when the setting power that the thrust or the pulling force of straight line driving surpassed spring; its limit switch just can be touched and be stopped the motion of piston rod, thereby realizes overload protection.
The present invention has also designed the better way self-con-tained unit for air door, it is characterized in that, on right air door, be provided with high-order light sensor (22) and low level light sensor (23), and be provided with door open limit switch (24) in a side of lane wall, on crossbeam (5), be provided with and close thresholding position buting iron and close door limit switch (25).Its automatically control by light sensor (22) (23), door open limit switch (24), close door limit switch (25), air door power set and corresponding limit for tonnage protective device and microcomputor program and cooperatively interact and finish.Its automatic control process is: when vehicles or pedestrians when photosensitive sensing device sends project signal, light sensor (22) (23) will import its signal into Control System of Microcomputer, and inform transmission success by signal lamp (this signal lamp just is contained in the light sensor) simultaneously, the information that Control System of Microcomputer can be imported into according to the program and the damper system of setting automatically, (as the actuating signal of light, various limit switches) realizes control automatically.Its automatic control process is: vehicles or pedestrians send light signal to light sensor (22) (23), the microcomputer acknowledge(ment) signal is also informed transmission success by signal lamp simultaneously, microcomputer sends the instruction of opening the door to actuating unit, the first road air door is opened and is fed back enabling signal by door open limit switch (24) to microcomputer, vehicles or pedestrians enter the tunnel between the first road air door and the second road air door, microcomputer sends out code to the first road air door after delaying time, the first road air door is closed and is fed back shutdown signal by closing door limit switch (25) to microcomputer, microcomputer sends open command to the second road air door, the second road door opening and time-delay, vehicles or pedestrians are by the second road air door, time-delay finishes the second road air door closes, and finishes automatic control process.If vehicles or pedestrians oppositely pass through, its program and process are identical, and just direction is opposite.Its automatic control program and executing agency are simple and reliable.
Certainly, the sensing mode of air door automatic control also has infrared rays, ultrasonic wave, radar etc., but still convenient with photosensitive control for this applied environment of underground air door by contrast, becomes optimum implementation of the present invention.
Claims (9)
1. the opposite opened self-controllable power air door of a front-and-back opening-closing, it is characterized in that, this air door by left air door (1), right air door (2), hinge (3), frame (4), crossbeam (5), left-hand door crank arm (6), right door is cranked arm (7), connecting rod (8) and air door power set formation; Frame (4) is embedded on the tunnel with the doorframe that crossbeam (5) connects and composes air door, left and right sides air door (1) (2) is hinged by hinge (3) and frame (4), left and right door crank arm (6) (7) respectively with about the upper end of two air doors (1) (2) fix, its hinged end is hinged by bearing pin and connecting rod (8) again, and is connected with the air door power set at the crank arm hinged end of (6) (7) of right air door or left air door.
2. the opposite opened self-controllable power air door of front-and-back opening-closing according to claim 1, it is characterized in that, on right air door, be provided with high-order light sensor (22) and low level light sensor (23), and be provided with door open limit switch (24) in a side of lane wall, on crossbeam (5), be provided with and close thresholding position buting iron and close door limit switch (25).
3. the opposite opened self-controllable power air door of front-and-back opening-closing according to claim 2; it is characterized in that; its method of controlling automatically is by light sensor (22) (23); door open limit switch (24); close door limit switch (25); air door power set and corresponding limit for tonnage protective device and microcomputor program cooperatively interact and finish; its automatic control process is: when vehicles or pedestrians when photosensitive sensing device sends project signal; light sensor (22) (23) will import its signal into Control System of Microcomputer; and inform transmission success by signal lamp (this signal lamp just is contained in the light sensor) simultaneously; the information that Control System of Microcomputer can be imported into according to the program and the damper system of setting automatically is (as light; the actuating signal of various limit switches) realizes control automatically.Its automatic control process is: vehicles or pedestrians send light signal to light sensor (22) (23), the microcomputer acknowledge(ment) signal is also informed transmission success by signal lamp simultaneously, microcomputer sends the instruction of opening the door to actuating unit, the first road air door is opened and is fed back enabling signal by door open limit switch (24) to microcomputer, vehicles or pedestrians enter the tunnel between the first road air door and the second road air door, microcomputer sends out code to the first road air door after delaying time, the first road air door is closed and is fed back shutdown signal by closing door limit switch (25) to microcomputer, microcomputer sends open command to the second road air door, the second road door opening and time-delay, vehicles or pedestrians are by the second road air door, time-delay finishes the second road air door closes, and finishes automatic control process; If vehicles or pedestrians oppositely pass through, its program and process are identical, and just direction is opposite.
4. the opposite opened self-controllable power air door of front-and-back opening-closing according to claim 1, it is characterized in that, its air door power set can be one group of power set that driven by the capstan winch driving machine, and these power set are made of jointly weight energy storage device that is contained in the air door left side and the capstan driving device that is contained in the air door right side; The weight energy storage device is made of weight string (11), left fixed pulley (9) and weight wire rope (12), and an end of its wire rope is contacted with weight and connect, and the other end passes crank arm with the left-hand door hinged end of (6) of left fixed pulley (9) and is connected; The capstan driving device on right side is by right fixed pulley (10), haulage cable (16), capstan winch (14), capstan winch driving machine (13), swing frame (18), frame bearing (17), balancing weight or pressing spring (20), the overload of opening the door limit switch (21), micro limit switch (19), the spacing fork of slack rope (15) constitute down; Frame bearing (17) is fixed with the tunnel, the right-hand member and the frame bearing (17) of swing frame (18) are hinged, the left end of swing frame is supported on the roadway floor, be provided with balancing weight or following pressing spring (20) in the bottom of swing frame left end, capstan winch driving machine (13) is fixed on the swing frame (18), capstan winch (14) is installed on the output shaft of capstan winch driving machine, the lower end of wire rope (16) is wrapped on the capstan winch (14), the upper end is passed right fixed pulley (10) and is connected with the hinged end of right crank arm (7), the overload limit switch (21) that opens the door is installed in the top of swing support, the upper end of the spacing fork of slack rope (15) is enclosed within on the haulage cable (12), and lower end and micro limit switch (19) form interlock; Capstan winch driving machine (13) can be the dynamic power machine that is made of motor and reductor, also can be hydraulic motor or wind motor.
5. the opposite opened self-controllable power air door of front-and-back opening-closing according to claim 4 is characterized in that, the capstan driving device on air door right side can be removed, and formation opens Door by Hand, the semi-automatic air door that weight is closed the door automatically.
6. the opposite opened self-controllable power air door of front-and-back opening-closing according to claim 4, it is characterized in that, also swing frame (18), frame bearing (17), balancing weight or following pressing spring (20), the overload of opening the door limit switch (21), micro limit switch (19), the spacing fork of slack rope (15) can be removed, directly be fixed on capstan winch driving machine (13) on the tunnel, set up the control corresponding button again, constitute the manually power air door of control capstan winch driving machine driving.
7. the opposite opened self-controllable power air door of front-and-back opening-closing according to claim 1, it is characterized in that, its air door power set can be the actuating units that is driven by straight line driving (26), and this straight line driving (26) can be cylinder, hydraulic cylinder, Electrohydraulic push rod or the linear drives machinery that is made of screw transmission mechanism or rack gear.
8. the opposite opened self-controllable power air door of front-and-back opening-closing according to claim 7 is characterized in that, can straight line driving (26) and bearing (27) is hinged, constitute the manually power air door of control straight line driving driving; Also can be connected with spring limit for tonnage protective device (28) by terminal pad (29) at the fixed end of straight line driving (26); again that cross axle on the spring limit for tonnage protective device (28) and bearing (27) is hinged, constitute the power air door of controlling automatically and realizing the straight line driving driving of automatic overload protection.
9. the opposite opened self-controllable power air door of front-and-back opening-closing according to claim 7, it is characterized in that spring limit for tonnage protective device (28) draws spring (34), limit to push away spring (35), front and back flange (33) (32), touch panel (37), stretching limit switch (36), pushing tow limit switch (38) formation by spring strut (30), expansion link (31), limit; Expansion link (31) is installed in the spring strut (30), the middle part of expansion link is processed with the shaft shoulder, be respectively charged into spring (34) (35) in the both sides of the shaft shoulder, front and back flange (33) (32) are fixed with the flange of spring strut (30) rear and front end respectively, touch panel (37) adopts the rear end that is bolted to expansion link, limit switch (36) (38) is separately fixed at the both sides, front and back of touch panel (37) by support, and its support is fixed on the rear end of spring strut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610079651XA CN101270670A (en) | 2006-05-05 | 2006-05-05 | Front and back opening/closing split type self-controllable power throttle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610079651XA CN101270670A (en) | 2006-05-05 | 2006-05-05 | Front and back opening/closing split type self-controllable power throttle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101270670A true CN101270670A (en) | 2008-09-24 |
Family
ID=40004870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200610079651XA Pending CN101270670A (en) | 2006-05-05 | 2006-05-05 | Front and back opening/closing split type self-controllable power throttle |
Country Status (1)
| Country | Link |
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| CN (1) | CN101270670A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102587963A (en) * | 2011-09-13 | 2012-07-18 | 杜志刚 | Equipment for comprehensively preventing 'one ventilation and three prevention accidents' of extraction working face |
| CN102587967A (en) * | 2011-09-13 | 2012-07-18 | 杜志刚 | Equipment for comprehensively preventing accidents of 'ventilation, dust proofing, gas prevention and fire proofing' of working face |
| CN102587964A (en) * | 2011-09-13 | 2012-07-18 | 杜志刚 | Comprehensively preventive equipment for ventilation and prevention of coal dust, fire and gas explosion for stope face |
| CN103216254A (en) * | 2012-01-20 | 2013-07-24 | 淮南矿业(集团)有限责任公司 | Air door opening and closing device |
| CN103758771A (en) * | 2013-12-31 | 2014-04-30 | 河南安彩高科股份有限公司 | Fan device and method for glass drying |
| CN104706277A (en) * | 2015-02-04 | 2015-06-17 | 苏州德莱电器有限公司 | Ground cleaning head of surface cleaning device |
| CN108510649A (en) * | 2018-04-17 | 2018-09-07 | 杭州纳戒科技有限公司 | Automatic selling equipment and system |
| CN112563719A (en) * | 2020-12-03 | 2021-03-26 | 合肥开关厂有限公司 | Mining protector communication wireless transmission device |
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2006
- 2006-05-05 CN CNA200610079651XA patent/CN101270670A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102587963A (en) * | 2011-09-13 | 2012-07-18 | 杜志刚 | Equipment for comprehensively preventing 'one ventilation and three prevention accidents' of extraction working face |
| CN102587967A (en) * | 2011-09-13 | 2012-07-18 | 杜志刚 | Equipment for comprehensively preventing accidents of 'ventilation, dust proofing, gas prevention and fire proofing' of working face |
| CN102587964A (en) * | 2011-09-13 | 2012-07-18 | 杜志刚 | Comprehensively preventive equipment for ventilation and prevention of coal dust, fire and gas explosion for stope face |
| CN103216254A (en) * | 2012-01-20 | 2013-07-24 | 淮南矿业(集团)有限责任公司 | Air door opening and closing device |
| CN103758771A (en) * | 2013-12-31 | 2014-04-30 | 河南安彩高科股份有限公司 | Fan device and method for glass drying |
| CN103758771B (en) * | 2013-12-31 | 2016-08-17 | 河南安彩高科股份有限公司 | A kind of blower fan apparatus being dried for glass and method |
| CN104706277A (en) * | 2015-02-04 | 2015-06-17 | 苏州德莱电器有限公司 | Ground cleaning head of surface cleaning device |
| CN108510649A (en) * | 2018-04-17 | 2018-09-07 | 杭州纳戒科技有限公司 | Automatic selling equipment and system |
| CN112563719A (en) * | 2020-12-03 | 2021-03-26 | 合肥开关厂有限公司 | Mining protector communication wireless transmission device |
| CN112563719B (en) * | 2020-12-03 | 2023-01-17 | 合肥开关厂有限公司 | Mining protector communication wireless transmission device |
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Open date: 20080924 |