CN214946179U - Electric cylinder with controllable power-loss fall-back speed - Google Patents
Electric cylinder with controllable power-loss fall-back speed Download PDFInfo
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- CN214946179U CN214946179U CN202121144958.XU CN202121144958U CN214946179U CN 214946179 U CN214946179 U CN 214946179U CN 202121144958 U CN202121144958 U CN 202121144958U CN 214946179 U CN214946179 U CN 214946179U
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Abstract
The invention discloses an electric cylinder with controllable power-loss fall-back speed, which comprises a motor, a speed limiter, a planetary gear reducer, a gear box and a cylinder barrel which are sequentially connected in a transmission manner and can rotate forward and backward, wherein the motor transmits power to the gear box through the speed limiter and the planetary gear reducer, the gear box drives a lead screw assembly and a piston rod assembly in the cylinder barrel to move up and down, the speed limiter comprises a box body, an overspeed clutch is arranged in the box body, a transition shaft is fixedly connected in the overspeed clutch, one end of the transition shaft is connected with the output end of the motor, the other end of the transition shaft is connected with the input end of the planetary gear reducer, the lead screw assembly stalls and descends, power is transmitted to the transition shaft after being accelerated by the planetary gear reducer through the gear box, the transition shaft drives the motor to accelerate and reverse, and the overspeed clutch brakes the transition shaft to enable the motor to rotate in a uniform speed. Through the mode, the electric cylinder with the controllable power-loss fall-back speed can control the stall fall-back speed of the electric cylinder within a safety range.
Description
Technical Field
The invention relates to the field of electric cylinders, in particular to an electric cylinder with controllable power-loss fall-back speed.
Background
Conventional electronic jar does not have speed limiter, and aerial work platform withdraws and provides reverse moment of torsion through the control motor to reach the purpose that aerial work platform descends at the uniform velocity, this kind of mode can't withdraw under the motor stops the power supply condition, also can't carry out potential energy and retrieve, can cause very big energy waste and potential safety hazard. When the high-altitude operation vehicle is in emergency withdrawing, the descending speed of the electric cylinder is controlled within a certain range, and the damage of the counter electromotive force current generated by the reversal of the motor to electronic components is prevented.
Disclosure of Invention
The invention mainly solves the technical problem of providing an electric cylinder with controllable power-loss fall-back speed, which can control the speed of the electric cylinder in a safe range.
In order to solve the technical problems, the invention adopts a technical scheme that: the utility model provides a controllable electronic jar of speed that falls back loses electricity, but including motor, overspeed governor, planetary gear reducer, gear box and the cylinder that just reverse that the transmission connects in proper order, the motor loops through overspeed governor and planetary gear reducer and transmits power to the gear box, lead screw assembly and the piston rod subassembly up-and-down motion in the gear box drive cylinder, the overspeed governor includes the box, be equipped with the overdrive clutch in the box, the transition axle has been linked firmly in the overdrive clutch, the one end of transition axle is connected with the output of motor, and the other end is connected with planetary gear reducer's input, lead screw assembly stall descends, and power passes through the gear box and transmits to the transition axle after planetary gear reducer acceleration rate, the transition axle drives the motor reversal with higher speed, and the overdrive clutch makes the motor at the uniform velocity reversal to the braking of transition axle.
In a preferred embodiment of the invention, the overdrive clutch comprises a shaft sleeve, the shaft sleeve is fixedly connected with the transition shaft, mounting frames are symmetrically arranged at two ends of the shaft sleeve, a friction plate in clearance fit with the box body is arranged on the outer side of each mounting frame, the left side and the right side of each mounting frame are connected through springs, a balancing weight is further arranged between each mounting frame and the shaft sleeve, and sliding cushion blocks are arranged between the left side and the right side of the balancing weight and the shaft sleeve.
In a preferred embodiment of the invention, the transition shaft accelerates and rotates reversely to generate centrifugal force to enable the friction plates and the box body to be subjected to friction braking so as to generate braking torque, until the braking torque is equal to reverse torque generated by the lead screw assembly due to gravity, and the motor rotates reversely at a constant speed.
In a preferred embodiment of the invention, the motor is provided with an electromagnetic brake with a manual release switch, and the motor is in a power-off state, and the manual release switch is pressed to enable the lead screw assembly to stall and descend.
In a preferred embodiment of the invention, the output end of the transition shaft is connected with a speed reducer shaft sleeve of a planetary gear speed reducer, the speed reducer shaft sleeve is connected with a sun gear, and the sun gear drives a planetary gear on a planetary gear carrier to output power through an output shaft on the planetary gear carrier.
In a preferred embodiment of the present invention, the screw assembly includes a ball screw and a screw nut, one end of the ball screw is in transmission connection with the gear box, the piston rod assembly includes a piston and a piston rod, the left end of the piston is connected with the screw nut, the right end of the piston is connected with the piston rod, the piston rod is sleeved outside the ball screw, the other end of the piston rod extends out of the cylinder barrel and is connected with the rod head, and the gear box drives the ball screw to rotate so that the screw nut drives the piston rod to reciprocate.
In a preferred embodiment of the invention, the other end of the ball screw is provided with an inner support piece, and the inner support piece is movably matched with the inner wall of the piston rod assembly.
In a preferred embodiment of the invention, the ball screw is further sleeved with a bearing inner sleeve, a bearing is fittingly installed on the outer side of the bearing inner sleeve, and an intermediate pin shaft is sleeved on the outer side of the bearing and connected between the gear box and the cylinder barrel.
In a preferred embodiment of the invention, the gear box comprises an upper gear, the upper gear is connected with an output shaft of the planetary gear reducer, the upper gear is also meshed with an idler gear, the idler gear is meshed with a lower gear, and the lower gear is fixedly connected with a ball screw so as to drive the ball screw to rotate.
The invention has the beneficial effects that: the electric cylinder with the controllable power-loss fall-back speed can control the stall fall-back speed of the electric cylinder within a safe range, prevent the counter electromotive force current generated by the reversal of the motor from damaging electronic components, and simultaneously recover the energy of the counter electromotive force generated by the uniform speed reversal of the motor, thereby meeting the requirements of emergency withdrawal and potential energy recovery.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic structural diagram of a preferred embodiment of an electric cylinder with controllable dropping speed after power loss;
FIG. 2 is a schematic view of a portion of the structure of FIG. 1;
FIG. 3 is a schematic view of a portion of the structure of FIG. 2;
FIG. 4 is a schematic view of a portion of the structure of FIG. 1;
the parts in the drawings are numbered as follows: 1. motor, 2, overspeed governor, 21, box, 22, overdrive clutch, 23, transition shaft, 24, shaft sleeve, 25, mounting bracket, 26, friction disc, 27, spring, 28, balancing weight, 29, sliding cushion block, 3, planetary gear reducer, 31, reducer shaft sleeve, 4, gear box, 41, upper gear, 42, idler, 43, lower gear, 5, cylinder, 6, electromagnetic brake, 61, manual release switch, 7, lead screw assembly, 71, ball screw, 72, lead screw nut, 73, inner support, 74, bearing inner sleeve, 75, bearing, 76, middle pin shaft, 8, piston rod assembly, 81, piston, 82, piston rod, 83, rod head.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, an electric cylinder with controllable power-off fall-back speed includes a motor 1 and a speed limiter 2 which are connected in sequence, planetary gear reducer 3, gear box 4 and cylinder 5, motor 1 loops through overspeed governor 2 and planetary gear reducer 3 with power transmission to gear box 4, gear box 4 drives lead screw subassembly 7 and the up-and-down motion of piston rod subassembly 8 in the cylinder 5, overspeed governor 2 includes box 21, be equipped with overdrive clutch 22 in the box 21, overdrive clutch 22 is internal to have linked firmly transition shaft 23, the one end of transition shaft 23 is connected with motor 1's output, the other end is connected with planetary gear reducer 3's input, lead screw subassembly 7 stall descends, power passes through gear box 4 and transmits to transition shaft 23 after planetary gear reducer 3 acceleration rate, transition shaft 23 drives motor 1 and reverses with higher speed, overdrive clutch 22 makes motor 1 reverse at the uniform velocity to transition shaft 23 braking.
In addition, overdrive clutch 22 includes axle sleeve 24, and axle sleeve 24 links firmly with transition shaft 23, and axle sleeve 24 both ends symmetry is provided with mounting bracket 25, and the outside of mounting bracket 25 is equipped with and box 21 clearance fit's friction disc 26, and the left and right sides of two mounting brackets 25 passes through spring 27 to be connected, still is equipped with balancing weight 28 between mounting bracket 25 and the axle sleeve 24, installs sliding cushion 29 between the left and right sides of balancing weight 28 and the axle sleeve 24.
In addition, the transition shaft 23 rotates reversely at an accelerated speed to generate centrifugal force, so that the friction plate 26 and the box body 21 are subjected to friction braking to generate braking torque until the braking torque is equal to reverse torque generated by the screw rod assembly 6 due to gravity, and the motor 1 rotates reversely at a constant speed. The transition shaft 23 drives the shaft sleeve 24 to rotate, when the rotating speed of the shaft sleeve 24 is low, the overspeed clutch has no braking torque, when the rotating speed reaches a certain value, the centrifugal force generated by the balancing weight 28 causes the friction plate 26 to contact with the box body 1 to generate the braking torque, and when the generated braking torque is equal to the reverse torque generated by gravity, the balanced rotating speed is reached, the motor 1 is in a state of uniform speed reverse rotation, and the screw rod assembly 7 descends at a uniform speed.
In addition, the motor 1 is provided with an electromagnetic brake 6 with a manual release switch 61, and the manual release switch 61 is pressed when the motor 1 is in a power-off state, so that the lead screw assembly 7 stalls and descends.
In addition, the output end of the transition shaft 23 is connected with a speed reducer sleeve 31 of the planetary gear speed reducer 3, the speed reducer sleeve 31 is connected with a sun gear, the sun gear drives a planetary gear on a planetary gear carrier, power is output through an output shaft on the planetary gear carrier, conventional components of the planetary gear speed reducer such as the sun gear, the planetary gear carrier and the like are not shown in the drawing, and the specific structure is consistent with that of the conventional planetary gear speed reducer. The gear box 4 comprises an upper gear 41, the upper gear 41 is connected with an output shaft of the planetary gear reducer 3, the upper gear 41 is also meshed with an idle gear 42, the idle gear 42 is meshed with a lower gear 43, and the lower gear 43 is fixedly connected with a ball screw 71 so as to drive the ball screw 71 to rotate. The planetary gear reducer flange is connected with the gear box shell through screws, the output shaft of the planetary gear reducer 3 is in key connection with the upper gear 41, the upper gear 41 is meshed with the idle gear 42, the idle gear 42 is meshed with the lower gear 43, and the lower gear 43 is in key connection with the ball screw 71.
In addition, the screw assembly 7 includes a ball screw 71 and a screw nut 72, one end of the ball screw 71 is in transmission connection with the gear box 4, and the gear box 4 drives the ball screw 71 to rotate so that the screw nut 72 drives the piston rod 82 to reciprocate. The other end of the ball screw 71 is provided with an inner support 73, and the inner support 73 is movably matched with the inner wall of the piston rod 82. One end of the piston 81 is connected with the feed screw nut 72 (with a safety nut) through a screw, the other end of the piston 81 is connected with the piston rod 82 through a screw, the rod head 83 is connected with the piston rod 82 through a thread, and the through hole mounting pin is arranged for looseness prevention after connection. The head 83 is connected to an external load (aerial cage). The inner support member 73 is supported by the inner hole wall of the piston rod 82, and functions to support the end of the ball screw 71 and also functions to guide the reciprocating movement of the piston rod 82.
In addition, a bearing inner sleeve 74 is further sleeved on the ball screw 71, a bearing 75 is fittingly installed on the outer side of the bearing inner sleeve 74, a middle pin shaft 76 is sleeved on the outer side of the bearing 75, and the middle pin shaft 76 is connected between the gear box 4 and the cylinder 5.
The electric cylinder with controllable power-loss fall-back speed has the following specific working principle:
the external battery of the motor 1 is electrified to run at a rated rotating speed, the motor 1 drives the piston rod 82 of the cylinder barrel 5 to ascend through the speed limiter 2, the planetary gear reducer 3 and the gear box 4 until an external load (an overhead working truck) reaches the highest position, the motor 1 is powered off at the moment, the electromagnetic brake 6 tightly holds the rotor shaft of the motor 1 to prevent the piston rod 82 from falling back, and the overspeed clutch 22 does not limit the speed in the process.
When the platform is emergently withdrawn/potential energy is recovered, the manual release switch 61 of the electromagnetic brake 6 is pulled, the electromagnetic brake 6 is opened, the piston rod 82 starts to fall back in an accelerating way under the action of gravity, the ball screw 71 accelerates and rotates at the moment to drive the lower gear 43, the idle gear 42 and the upper gear 41 to accelerate and rotate synchronously, the upper gear 41 transmits power to the planetary gear reducer 3, the rotating speed is amplified and acts on the reducer shaft sleeve 31, the transition shaft 23 is driven by the reducer shaft sleeve 31 to start to accelerate and rotate synchronously, the rotor shaft of the motor 1 also starts to accelerate and rotate reversely synchronously, because the transition shaft 23 is in key connection with the overrunning clutch 22, when the rotating speed reaches the limited value of the rotating speed of the overrunning clutch, the centrifugal force generated by the counterweight 28 drives the mounting frame 25 and the friction plate 26 to move towards the box body 1, and the friction plate 26 is in contact with the box body 1 to generate braking torque, when the generated braking torque is equal to the reverse torque generated by gravity, the balance rotating speed is reached, the motor 1 is in a state of uniform speed reverse rotation, the piston rod 72 descends at a uniform speed, finally the electric cylinder descends at a uniform speed, and the motor 1 reversely rotates to generate a counter electromotive force for energy recovery.
Compared with the prior art, the electric cylinder with controllable power-loss fall-back speed can control the stall fall-back speed of the electric cylinder within a safe range, prevent the counter electromotive force current generated by the reversal of the motor from damaging electronic components, and simultaneously recover the energy of the counter electromotive force generated by the uniform-speed reversal of the motor, thereby meeting the requirements of emergency withdrawal and potential energy recovery.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. An electric cylinder with controllable power-off fall-back speed comprises a motor capable of rotating forward and backward, a speed limiter, a planetary gear reducer, a gear box and a cylinder barrel which are connected in sequence in a transmission way, the motor transmits power to the gear box through the speed limiter and the planetary gear reducer in sequence, the gear box drives the screw rod assembly and the piston rod assembly in the cylinder barrel to move up and down, it is characterized in that the speed limiter comprises a box body, an overspeed clutch is arranged in the box body, a transition shaft is fixedly connected in the overspeed clutch, one end of the transition shaft is connected with the output end of the motor, the other end of the transition shaft is connected with the input end of the planetary gear reducer, the lead screw component stalls and descends, power is transmitted to the transition shaft after being accelerated by the planetary gear reducer through the gear box, the transition shaft drives the motor to rotate reversely in an accelerating mode, and the overspeed clutch brakes the transition shaft to enable the motor to rotate reversely at a constant speed.
2. The electric cylinder with the controllable power-loss fall-back speed according to claim 1, wherein the overspeed clutch comprises a shaft sleeve, the shaft sleeve is fixedly connected with the transition shaft, mounting frames are symmetrically arranged at two ends of the shaft sleeve, friction plates in clearance fit with the box body are arranged on the outer sides of the mounting frames, the left side and the right side of the two mounting frames are connected through springs, a balancing weight is further arranged between the mounting frames and the shaft sleeve, and sliding cushion blocks are arranged between the left side and the right side of the balancing weight and the shaft sleeve.
3. The electric cylinder with controllable power-loss fall-back speed according to claim 2, wherein the transition shaft accelerates and reverses to generate centrifugal force to enable the friction plates and the box body to be subjected to friction braking so as to generate braking torque until the braking torque is equal to reverse torque generated by the lead screw assembly due to gravity, and the motor reverses at a constant speed.
4. The electric cylinder with controllable power-loss fall-back speed according to claim 3, wherein an electromagnetic brake with a manual release switch is mounted on the motor, and the motor is powered off and the manual release switch is pressed to stall and lower the lead screw assembly.
5. The electric cylinder with controllable power loss and fall back speed as claimed in any one of claims 1 to 4, wherein the output end of the transition shaft is connected with a speed reducer shaft sleeve of a planetary gear speed reducer, the speed reducer shaft sleeve is connected with a sun gear, and the sun gear drives a planetary gear on a planetary gear carrier to output power through an output shaft on the planetary gear carrier.
6. The electric cylinder with controllable power-loss fall-back speed according to claim 5, wherein the screw assembly comprises a ball screw and a screw nut, one end of the ball screw is in transmission connection with the gear box, the piston rod assembly comprises a piston and a piston rod, the left end of the piston is connected with the screw nut, the right end of the piston is connected with the piston rod, the piston rod is sleeved outside the ball screw, the other end of the piston rod extends out of the cylinder barrel and is connected with the rod head, and the gear box drives the ball screw to rotate so that the screw nut drives the piston rod to reciprocate.
7. The electric cylinder with controllable power-loss fall-back speed according to claim 6, wherein an inner supporting piece is arranged at the other end of the ball screw, and the inner supporting piece is movably matched with the inner wall of the piston rod assembly.
8. The electric cylinder with controllable power-loss fall-back speed according to claim 7, characterized in that a bearing inner sleeve is further sleeved on the ball screw, a bearing is fittingly installed on the outer side of the bearing inner sleeve, and an intermediate pin shaft is sleeved on the outer side of the bearing and connected between the gear box and the cylinder barrel.
9. The electric cylinder with controllable power loss and fall back speed as claimed in claim 8, wherein the gear box comprises an upper gear, the upper gear is connected with an output shaft of the planetary gear reducer, the upper gear is further engaged with an idle gear, the idle gear is engaged with a lower gear, and the lower gear is fixedly connected with a ball screw to drive the ball screw to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121144958.XU CN214946179U (en) | 2021-05-26 | 2021-05-26 | Electric cylinder with controllable power-loss fall-back speed |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121144958.XU CN214946179U (en) | 2021-05-26 | 2021-05-26 | Electric cylinder with controllable power-loss fall-back speed |
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| CN214946179U true CN214946179U (en) | 2021-11-30 |
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| CN202121144958.XU Active CN214946179U (en) | 2021-05-26 | 2021-05-26 | Electric cylinder with controllable power-loss fall-back speed |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116915017A (en) * | 2023-09-11 | 2023-10-20 | 江苏恒立液压股份有限公司 | Linear actuating device, lifting equipment and control method |
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2021
- 2021-05-26 CN CN202121144958.XU patent/CN214946179U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116915017A (en) * | 2023-09-11 | 2023-10-20 | 江苏恒立液压股份有限公司 | Linear actuating device, lifting equipment and control method |
| CN116915017B (en) * | 2023-09-11 | 2023-12-12 | 江苏恒立液压股份有限公司 | Linear actuating device, lifting equipment and control method |
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