CN113290927A - Flywheel rapid braking and automatic resetting device - Google Patents
Flywheel rapid braking and automatic resetting device Download PDFInfo
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- CN113290927A CN113290927A CN202110619457.0A CN202110619457A CN113290927A CN 113290927 A CN113290927 A CN 113290927A CN 202110619457 A CN202110619457 A CN 202110619457A CN 113290927 A CN113290927 A CN 113290927A
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- 230000002093 peripheral effect Effects 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 15
- 210000004907 gland Anatomy 0.000 claims description 14
- 230000001939 inductive effect Effects 0.000 claims description 13
- 230000003584 silencer Effects 0.000 claims description 4
- 230000002146 bilateral effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 230000006698 induction Effects 0.000 abstract description 7
- 230000007246 mechanism Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000003825 pressing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/10—Brakes specially adapted for presses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/14—Control arrangements for mechanically-driven presses
- B30B15/142—Control arrangements for mechanically-driven presses controlling the brake or the clutch
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/14—Control arrangements for mechanically-driven presses
- B30B15/148—Electrical control arrangements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a flywheel rapid braking and automatic resetting device which comprises motors and flywheels which are arranged on an upper cross beam at intervals, wherein the flywheels are connected with the motors through belts, the flywheel rapid braking and automatic resetting device further comprises two braking resetting mechanisms, an oil atomizer, induction switches and a PLC (programmable logic controller), the two braking resetting mechanisms are symmetrically arranged on two opposite sides of each flywheel, the induction switches are arranged on the lateral sides of the flywheels and are arranged on the upper cross beam through switch supports, each braking resetting mechanism comprises a braking resetting component, an electromagnetic valve and a microswitch, the braking resetting components and the electromagnetic valves are respectively arranged on the upper cross beam, the electromagnetic valves are connected with the braking resetting components, the microswitches are arranged on one side face of each braking resetting component, and the oil atomizer is respectively connected with the two electromagnetic valves. The device uses two groups of braking reset mechanisms, and two control air paths are connected in parallel on two sides of the flywheel, so that the flywheel can be braked or loosened simultaneously, and the situation that if one side of the flywheel fails in braking, the other side of the flywheel can still work normally is prevented, and thus, double insurance of flywheel braking is realized.
Description
Technical Field
The invention relates to the field of liquid agricultural production equipment, in particular to a flywheel rapid braking and automatic resetting device.
Background
The mechanical press machine generally drives a flywheel through a main motor, and then realizes the linear motion of a sliding block through a clutch, a gear, a crankshaft and a connecting rod. The flywheel acts to reduce the motor power, and also to store the energy transmitted by the motor and release it at the instant of punching. The rotating speed of the flywheel is generally within 100-300R/min in the working process of the machine tool. When the machine tool needs to be overhauled or maintained, in order to ensure manual safety, the flywheel needs to be decelerated and stopped firstly. Some presses do not have a flywheel brake in order to reduce manufacturing cost and customer purchase cost, and the stop of flywheel is just closing the motor earlier, and then the flywheel slows down slowly under the effect of dead weight until static, causes the time that the workman waited for long, extravagant manual work, and enterprise overhauls, maintains the lathe inefficiency. Some presses are only provided with a flywheel brake, the braking area is small, the braking efficiency is not high, and if the brake fails due to failure, the braking of the flywheel can be restored to the most original state, namely, the flywheel slowly decelerates depending on the dead weight. Some presses do not have flywheel rotational speed detection yet, and the back of braker work like this, when the flywheel slows down and totally stops and need artifical incessant looking over, laggard behind.
Disclosure of Invention
The purpose of the invention is as follows: in view of the above problems, the present invention aims to provide a flywheel rapid braking and automatic resetting device, which is more convenient for machine tool personnel to overhaul and maintain a machine tool, improves maintenance efficiency, and reduces labor waste.
The technical scheme is as follows: the utility model provides a flywheel rapid braking and automatic re-setting device, include the motor of interval installation on the entablature, the flywheel passes through the belt and is connected with the motor, still include braking canceling release mechanical system, the oil atomizer, inductive switch, PLC, braking canceling release mechanical system is equipped with two, set up in the relative bilateral symmetry of flywheel, inductive switch sets up in flywheel side and installs on the entablature through the switch bracket, braking canceling release mechanical system is including braking reset assembly, the solenoid valve, micro-gap switch, braking reset assembly, the solenoid valve is installed respectively on the entablature, the solenoid valve is connected with braking reset assembly, micro-gap switch installs on a side of braking reset assembly, the oil atomizer is connected with two solenoid valves respectively, two solenoid valves, the motor, inductive switch and two micro-gap switches respectively with PLC signal connection.
Furthermore, the braking reset assembly comprises a reset cylinder, an incoming seat, a lining and a connecting plate, wherein the incoming seat is connected with one end of a piston of the reset cylinder, the lining is connected with the incoming seat and faces towards the outer circle of the flywheel, two kidney-shaped holes are formed in the connecting plate, the connecting plate is installed on one side face of the reset cylinder through the kidney-shaped holes, and the micro switch is installed on the connecting plate and is in contact with the incoming seat.
Further, the reset cylinder still includes the cylinder body, the cylinder cap, the gland, the pull rod, a spring, hexagonal slotted nut, the split pin, the spring housing is located on the pull rod, pull rod one end is connected with hexagonal slotted nut and is fastened through the split pin, hexagonal slotted nut and spring one end are supported and are closed, the gland is located on the pull rod from the pull rod other end cover, its one side supports with the boss on the pull rod and closes, another side supports with the spring other end and closes, the piston sets up in the cylinder body and contacts with its inner peripheral surface, pull rod one end is worn to locate in the piston, the gland is connected with the piston other end, cylinder cap closing cap cylinder body one end, the pull rod other end is worn to locate the cylinder cap and is connected with it, the cylinder body is connected with the entablature, air inlet A on the cylinder cap passes through the solenoid valve and is connected with the oil atomizer.
Furthermore, the reset cylinder also comprises a screw rod, an elongated slot is arranged on the peripheral surface of the piston along the axial direction of the piston, and one end of the screw rod vertically penetrates through the peripheral surface of the cylinder body and is arranged in the elongated slot to the end part of the screw rod.
The screw rod plays a limiting role on the piston.
Preferably, the air outlet of the reset cylinder is arranged on the peripheral surface of the cylinder body and is positioned between the cylinder cover and the screw rod.
Furthermore, the reset cylinder further comprises a first O-shaped sealing ring, a second O-shaped sealing ring and a third O-shaped sealing ring, the first O-shaped sealing ring is arranged between the connecting surfaces of the cylinder cover and the pull rod, the second O-shaped sealing ring is arranged between the connecting surfaces of the cylinder cover and the cylinder body, and the third O-shaped sealing ring is arranged between the contact surfaces of the piston and the cylinder body.
Furthermore, one end of the seat is provided with a protrusion, one end of the piston is provided with a blind hole, the protrusion is inserted into the blind hole to position the seat on the piston, a wedge-shaped key is arranged between the piston and the seat, the wedge-shaped key is L-shaped, one end of the wedge-shaped key vertically penetrates through the outer peripheral surface of the seat, and the other end of the wedge-shaped key is connected with the outer peripheral surface of the piston through a bolt.
Preferably, the friction coefficient of the linen pad is 0.35-0.45.
Preferably, the solenoid valve is a two-way solenoid valve.
Preferably, the device further comprises a silencer, and each electromagnetic valve is connected with a silencer.
Has the advantages that: compared with the prior art, the invention has the advantages that: two groups of braking reset mechanisms are used, two control air paths are connected in parallel on two sides of the flywheel, so that the flywheel is braked or loosened simultaneously, and the situation that if one side of the flywheel fails in braking, the other side of the flywheel still can work normally is prevented, and thus double insurance of flywheel braking is realized. Two sets of brake pads are used for braking, the braking area is large, the two-way electromagnetic valves on the first branch and the second branch are arranged on the upper cross beam and close to the cylinder cover, the distance of air pressure entering the cylinder cover is short, the air loss is low, and the piston can be guaranteed to rapidly respond and move after the electromagnetic valves are ventilated, so that the flywheel can be quickly and efficiently braked by the brake pads. The material of the linen pad is imported, the friction coefficient is 0.4, the wear resistance is high, and the service life is long. The piston and the brake shoe are fixed by using the wedge-shaped key and the bolt, the wedge-shaped key needs large pretightening force when being installed, and can bear the flywheel to transmit large axial force to the brake shoe after being installed, so that the brake shoe and the piston are prevented from loosening in the braking and resetting reciprocating motion processes.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view I of FIG. 1;
FIG. 3 is a cross-sectional view B-B of FIG. 2;
fig. 4 is a view taken along direction K of fig. 1.
Detailed Description
The present invention will be further illustrated with reference to the following figures and specific examples, which are to be understood as merely illustrative and not restrictive of the scope of the invention.
A flywheel rapid braking and automatic resetting device is shown in figures 1-4 and comprises a motor 18 and a flywheel 22 which are arranged on an upper cross beam 23 at intervals, wherein the flywheel 22 is connected with the motor 18 through a belt 19, and the flywheel rapid braking and automatic resetting device further comprises a braking resetting mechanism, an oil atomizer 24, an induction switch 21 and a PLC.
A spring 9 is sleeved on a pull rod 5, one end of the pull rod 5 is connected with a hexagonal slotted nut 6 and is fastened through a cotter pin 7, the hexagonal slotted nut 6 is abutted with one end of the spring 9, a gland 10 is sleeved on the pull rod 5 from the other end of the pull rod 5, one side surface of the gland is abutted with a boss on the pull rod 5, the other side surface of the gland is abutted with the other end of the spring 9, a piston 2 is arranged in a cylinder body 1 and is contacted with the inner circumferential surface of the piston 2, one end of the pull rod 5 is penetrated in the piston 2, the gland 10 is connected with the other end of the piston 2, the cylinder cover 8 covers one end of the cylinder body 1, the other end of the pull rod 5 is penetrated in the cylinder cover 8 and is connected with the cylinder cover, the cylinder body 1 is connected with an upper cross beam 23, an air inlet A on the cylinder cover 8 is connected with an oil atomizer 24 through an electromagnetic valve 25, an O-shaped seal ring I11 is arranged between the connecting surface of the cylinder cover 8 and the pull rod 5, an O-shaped seal ring II 12 is arranged between the connecting surface of the cylinder cover 8 and the cylinder body 1, an O-shaped seal ring III 13 is arranged between the contacting surface of the piston 2 and the cylinder body 1, an elongated slot is formed in the outer peripheral surface of the piston 2 along the axial direction of the piston, one end of the screw 14 vertically penetrates through the outer peripheral surface of the cylinder body 1 to be arranged in the elongated slot at the end part of the screw 14, an air outlet of the reset cylinder is arranged on the outer peripheral surface of the cylinder body 1, and the air outlet is positioned between the cylinder cover 8 and the screw 14.
The seat 3 is connected with one end of a piston 2 of the reset cylinder, one end of the seat 3 is provided with a protrusion, one end of the piston 2 is provided with a blind hole, the protrusion is inserted into the blind hole to position the seat 3 on the piston 2, a wedge-shaped key 15 is further arranged between the piston 2 and the seat 3, the wedge-shaped key 15 is L-shaped, one end of the wedge-shaped key 15 vertically penetrates through the outer peripheral surface of the seat 3, the other end of the wedge-shaped key is connected with the outer peripheral surface of the piston 2 through a bolt, a lining 4 is connected with the seat 3 and faces the outer circle of the flywheel 22, the friction coefficient of the lining 4 is 0.35-0.45, two kidney-shaped holes 171 are formed in a connecting plate 17, the connecting plate 17 is installed on one side surface of the reset cylinder through the kidney-shaped holes 171, and a microswitch 16 is installed on the connecting plate 17 and is in contact with the seat 3.
The microswitch 16 is arranged on one side surface of the brake resetting assembly, the air source is communicated with the oil atomizer 24, the oil atomizer 24 is connected with the two electromagnetic valves 25 which are communicated with the two brake resetting assemblies to form two parallel branches (a branch I and a branch II), and the two electromagnetic valves 25, the motor 18, the induction switch 21 and the two microswitches 16 are respectively connected with the PLC through signals.
After the machine tool is electrified, the motor rotates, then the belt drives the flywheel to rotate together, and the machine tool works normally. When the PCL does not receive a flywheel braking stop instruction, the electromagnetic valve is not switched on and is in the original position, and the first air source branch and the second air source branch are not switched on at the moment. The pressing cover, the piston, the brake seat and the brake pad are connected into a whole, and the compression spring force pushes the pull rod to be limited on the cylinder cover in the direction of the pressing cover, so that the pressing cover, the piston, the brake seat and the brake pad are kept in a static state. At the moment, the microswitch just touches the order seat, and can feed back a signal to the PLC to display that the order sheet is in the original position and is in an inoperative state. The inductive switch is arranged on the excircle of the flywheel, collects the flywheel rotating speed signal and feeds back the flywheel rotating speed signal to the PLC.
When the PCL receives a flywheel braking stop command, the motor starts to decelerate, the PLC controls the solenoid valve to be switched on and move to the left position, and at the moment, the first air source branch and the second air source branch are both switched on. The air source enters the air inlets A of the two cylinder covers along the first branch and the second branch respectively to push the gland, the piston, the seat and the brake lining to be jointed together towards the excircle direction of the flywheel, and the product of air pressure and contact area is equal to braking pressure, so that the excircle braking of the flywheel is realized. At the moment, the microswitch is disconnected to drive the seat, and a signal is fed back to the PLC to display that the brake lining is moved and is in a working state. The inductive switch detects that the rotating speed of the flywheel is continuously reduced in the braking process, and the collected rotating speed reduction signal of the flywheel is fed back to the PLC. The screw rod on the cylinder that resets can restrict piston extension length, places its excessively to stretch out or break away from the cylinder body, influences the braking effect of lining, guarantees the reliable and stable of braking.
The micro switch and the inductive switch are connected with the PLC, and the micro switch and the inductive switch are in correspondence with each other and cannot be used. The microswitch detects whether the brake pad moves or not and detects the starting process of braking; the inductive switch can detect whether the brake pad contacts the flywheel or not and whether the brake function is generated or not by sensing the rotating speed of the flywheel, and the signals are fed back to the PLC, so that an automatic result can be detected. When braking is finished, the air source is cut off, and the reset cylinder can enable the piston to quickly return to the initial position under the action of the elastic force of the spring, so that automatic reset is realized.
The connecting plate is connected with the cylinder body and is a waist-shaped hole, so that the microswitch can be conveniently adjusted according to the actual installation position of the seat, and the flexibility is higher.
According to the invention, two sets of brake pads are used for braking, the braking area is large, the electromagnetic valves on the first branch and the second branch are both arranged on the upper cross beam and close to the cylinder cover, the distance of air pressure entering the cylinder cover is short, the air loss is small, and the rapid response movement of the piston after the electromagnetic valves are ventilated can be ensured, so that the rapid and efficient braking of the brake pads on the flywheel is realized.
According to the brake pad, the cylinder body and the upper cross beam are connected through the bolts and are fixed and prevented from loosening through the two positioning pins, the end faces of the pull rod and the spring are fixed and prevented from loosening through the nuts and the split pins, and the brake stability of the brake pad is guaranteed. The pull rod is connected with the connecting end of the cylinder cover through the nut, the nut is sleeved on the pull rod, and meanwhile a certain adjustable interval is arranged between the nut and the cylinder cover, so that the movement stroke of the piston is adjustable by adjusting the position of the pull rod.
The invention provides a mechanism with high safety and reliability, linkage and high efficiency for rapidly braking and automatically resetting two sides of a flywheel, so that machine tool personnel can more conveniently overhaul and maintain the machine tool, the maintenance efficiency is improved, and the labor waste is reduced.
Claims (10)
1. The utility model provides a quick braking of flywheel and automatic re-setting device, includes motor, the flywheel of interval installation on the entablature, and the flywheel passes through the belt to be connected its characterized in that with the motor: still include braking canceling release mechanical system, the oil atomizer, inductive switch, PLC, braking canceling release mechanical system is equipped with two, set up in the relative bilateral symmetry of flywheel, inductive switch sets up in flywheel side and installs on the entablature through the switch support, braking canceling release mechanical system is including braking reset assembly, the solenoid valve, micro-gap switch, braking reset assembly, the solenoid valve is installed respectively on the entablature, the solenoid valve is connected with braking reset assembly, micro-gap switch installs on a side of braking reset assembly, the oil atomizer is connected with two solenoid valves respectively, two solenoid valves, the motor, inductive switch and two micro-gap switches respectively with PLC signal connection.
2. The flywheel quick braking and automatic return device according to claim 1, characterized in that: the brake reset assembly comprises a reset cylinder, an incoming seat, a lining sheet and a connecting plate, wherein the seat is connected with one end of a piston of the reset cylinder, the lining sheet is connected with the incoming seat and faces towards the outer circle of the flywheel, two waist-shaped holes are formed in the connecting plate, the connecting plate is installed on one side face of the reset cylinder through the waist-shaped holes, and a microswitch is installed on the connecting plate and is in contact with the incoming seat.
3. A flywheel quick braking and automatic return device according to claim 2, characterized in that: the reset cylinder further comprises a cylinder body, a cylinder cover, a gland, a pull rod, a spring, a hexagonal slotted nut and a split pin, wherein the spring is sleeved on the pull rod, one end of the pull rod is connected with the hexagonal slotted nut and is fastened through the split pin, the hexagonal slotted nut is abutted to one end of the spring, the gland is sleeved on the pull rod from the other end of the pull rod, one side of the gland is abutted to a boss on the pull rod, the other side of the gland is abutted to the other end of the spring, the piston is arranged in the cylinder body and is in contact with the inner peripheral surface of the piston, one end of the pull rod is arranged in the piston in a penetrating mode, the gland is connected with the other end of the piston, one end of the cylinder body is sealed by the cylinder cover, the other end of the pull rod is arranged in the cylinder cover and is connected with the cylinder cover, and an air inlet A on the cylinder cover is connected with an oil sprayer through an electromagnetic valve.
4. A flywheel quick braking and automatic return device according to claim 3, characterized in that: the reset cylinder also comprises a screw rod, an elongated slot is arranged on the peripheral surface of the piston along the axial direction of the piston, and one end of the screw rod vertically penetrates through the peripheral surface of the cylinder body and is arranged in the elongated slot to the end part of the screw rod.
5. The flywheel quick braking and automatic return device according to claim 4, characterized in that: the gas outlet of the reset cylinder is arranged on the peripheral surface of the cylinder body and is positioned between the cylinder cover and the screw rod.
6. A flywheel quick braking and automatic return device according to claim 3, characterized in that: the reset cylinder further comprises a first O-shaped sealing ring, a second O-shaped sealing ring and a third O-shaped sealing ring, the first O-shaped sealing ring is arranged between the connecting surfaces of the cylinder cover and the pull rod, the second O-shaped sealing ring is arranged between the connecting surfaces of the cylinder cover and the cylinder body, and the third O-shaped sealing ring is arranged between the contact surfaces of the piston and the cylinder body.
7. A flywheel quick braking and automatic return device according to claim 2, characterized in that: the piston is provided with a wedge-shaped key, the wedge-shaped key is L-shaped, one end of the wedge-shaped key vertically penetrates through the outer peripheral surface of the order seat, and the other end of the wedge-shaped key is connected with the outer peripheral surface of the piston through a bolt.
8. A flywheel quick braking and automatic return device according to claim 2, characterized in that: the friction coefficient of the linen pad is 0.35-0.45.
9. The flywheel quick braking and automatic return device according to claim 1, characterized in that: the electromagnetic valve is a two-way electromagnetic valve.
10. A flywheel quick braking and automatic return device according to claim 1 or 9, characterized in that: the electromagnetic valve is characterized by further comprising silencers, and each electromagnetic valve is connected with one silencer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110619457.0A CN113290927B (en) | 2021-06-03 | 2021-06-03 | Flywheel rapid braking and automatic resetting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110619457.0A CN113290927B (en) | 2021-06-03 | 2021-06-03 | Flywheel rapid braking and automatic resetting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113290927A true CN113290927A (en) | 2021-08-24 |
| CN113290927B CN113290927B (en) | 2024-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110619457.0A Active CN113290927B (en) | 2021-06-03 | 2021-06-03 | Flywheel rapid braking and automatic resetting device |
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| Country | Link |
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| CN (1) | CN113290927B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4312435A (en) * | 1978-05-22 | 1982-01-26 | The Brown Boggs Foundry And Machine Company Limited | Safety devices for mechanically operated apparatus such as a punch press |
| CN102756051A (en) * | 2012-06-28 | 2012-10-31 | 浙江金澳兰机床有限公司 | Flywheel brake device for punch press |
| CN108838307A (en) * | 2018-09-29 | 2018-11-20 | 四川德胜集团钒钛有限公司 | High vanadium titanium steel muscle shearing machine system |
| CN110641033A (en) * | 2019-11-05 | 2020-01-03 | 天津索玛科技有限公司 | Multifunctional laminating machine |
| CN217197142U (en) * | 2021-06-03 | 2022-08-16 | 沃得精机(中国)有限公司 | Flywheel rapid braking and automatic resetting device |
-
2021
- 2021-06-03 CN CN202110619457.0A patent/CN113290927B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4312435A (en) * | 1978-05-22 | 1982-01-26 | The Brown Boggs Foundry And Machine Company Limited | Safety devices for mechanically operated apparatus such as a punch press |
| CN102756051A (en) * | 2012-06-28 | 2012-10-31 | 浙江金澳兰机床有限公司 | Flywheel brake device for punch press |
| CN108838307A (en) * | 2018-09-29 | 2018-11-20 | 四川德胜集团钒钛有限公司 | High vanadium titanium steel muscle shearing machine system |
| CN110641033A (en) * | 2019-11-05 | 2020-01-03 | 天津索玛科技有限公司 | Multifunctional laminating machine |
| CN217197142U (en) * | 2021-06-03 | 2022-08-16 | 沃得精机(中国)有限公司 | Flywheel rapid braking and automatic resetting device |
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| Publication number | Publication date |
|---|---|
| CN113290927B (en) | 2024-08-13 |
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