CN113028014A - Short zero-length gas-assisted electric cylinder device - Google Patents
Short zero-length gas-assisted electric cylinder device Download PDFInfo
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- CN113028014A CN113028014A CN202110121592.2A CN202110121592A CN113028014A CN 113028014 A CN113028014 A CN 113028014A CN 202110121592 A CN202110121592 A CN 202110121592A CN 113028014 A CN113028014 A CN 113028014A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 210000004907 gland Anatomy 0.000 claims description 76
- 238000005096 rolling process Methods 0.000 claims description 37
- 238000007789 sealing Methods 0.000 claims description 30
- 239000000872 buffer Substances 0.000 claims description 9
- 230000003584 silencer Effects 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 abstract description 7
- 230000033001 locomotion Effects 0.000 description 19
- 230000001965 increasing effect Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1433—End caps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
- F15B15/1461—Piston rod sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/008—Reduction of noise or vibration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
Abstract
The invention relates to a short zero-length gas-assisted electric cylinder device which comprises a motor and a cylinder body assembly which are coaxially arranged, wherein the cylinder body assembly comprises a cylinder barrel, and a screw rod, a screw rod nut and a piston rod which are coaxially arranged in the cylinder barrel; one end of the cylinder barrel is hermetically connected with the shell of the motor; one end of the screw rod penetrates through a rotor of the motor and is fixedly connected with the rotor; the screw rod nut is sleeved outside the screw rod and is in screw transmission with the screw rod; the piston rod is sleeved outside the screw rod and is fixedly connected with the screw rod nut; the piston rod divides the cylinder barrel into a cylinder barrel rod cavity and a closed cylinder barrel rodless cavity, and the cylinder barrel rodless cavity is provided with a vent hole for being connected with an external air-assisted system. The invention has the characteristics of compact structure, zero length, high precision, cylinder pressure maintaining, buffering and the like.
Description
Technical Field
The invention relates to the technical field of driving cylinders, in particular to a short zero-length pneumatic-assisted electric cylinder device.
Background
With the higher and higher requirements of factory automation, the electric cylinder is in operation. The electric cylinder is a modularized product which is designed by combining a servo motor and a screw rod, mainly comprises the parts such as the servo motor, a motor mounting flange, a bearing seat, the screw rod, a coupling, a piston rod, a cylinder barrel and the like, takes electric power as a direct power source, and can realize the function of reciprocating linear telescopic motion similar to that of a cylinder.
An electric cylinder generally adopts a motor to drive a screw rod (such as a trapezoidal screw rod and a ball screw rod) or a synchronous wheel to rotate, and the rotary motion is converted into reciprocating linear motion through a screw rod nut, so that a piston rod connected with the screw rod nut is driven to do telescopic motion in a cylinder barrel, and further, the load motion is pushed. Compared with the air cylinder, the electric cylinder has high positioning precision, but if the time for keeping at a specific position is longer, the electric cylinder consumes more energy, and the electric cost is higher. The air cylinder only consumes energy in a short time of action, air intake and pressurization are completely not needed when a specific position is kept, energy consumption is avoided, pressure maintaining, buffering and force increasing effects can be achieved, and meanwhile compressed air used by the air cylinder is rich in resources and can be recycled.
When the electric cylinder moves, the piston rod is completely extended, and the total length of the electric cylinder is the longest cylinder length. The piston rod is completely retracted, and the electric cylinder is always the shortest cylinder length at the moment. The difference between the longest cylinder length and the shortest cylinder length is the electric cylinder stroke, and the difference between the shortest cylinder length and the electric cylinder stroke is the zero length of the electric cylinder. For the application occasion that the space is comparatively compact, short zero-length electronic jar is conveniently arranged. Meanwhile, for the application occasions with the same use stroke, the short zero-length electric cylinder can reduce the overall size of the equipment, so that the overall equipment design cost is reduced, and the equipment motion envelope space is reduced.
Therefore, by combining the advantages of the electric cylinder and the air cylinder, a short zero-length air-assisted electric cylinder device is needed.
Disclosure of Invention
The invention provides a short zero-length air-assisted electric cylinder device aiming at the technical problems in the prior art, and solves the problems that the design cost and the use cost are high, the use environment of large load and compact space is not suitable, and the interference with surrounding environment facilities is caused.
The technical scheme for solving the technical problems is as follows: a short-zero-length gas-assisted electric cylinder device comprises a motor and a cylinder body assembly which are coaxially arranged, wherein the cylinder body assembly comprises a cylinder barrel, and a screw rod, a screw nut and a piston rod which are coaxially arranged in the cylinder barrel; one end of the cylinder barrel is hermetically connected with the shell of the motor; one end of the screw rod penetrates through a rotor of the motor and is fixedly connected with the rotor; the screw rod nut is sleeved outside the screw rod and is in screw transmission with the screw rod; the piston rod is of a hollow structure, is sleeved outside the screw rod and is fixedly connected with the screw rod nut; the piston rod divides the cylinder barrel into a cylinder barrel rod cavity and a closed cylinder barrel rodless cavity, and the cylinder barrel rodless cavity is provided with a vent hole for being connected with an external air-assisted system.
Preferably, the motor is characterized in that a bearing gland and a motor front end cover are fixedly arranged at one end, close to the cylinder barrel, of the motor shell, the bearing gland is connected with the cylinder barrel in a sealing mode, a first stepped through hole is formed in the motor front end cover, a large-diameter hole in the first stepped through hole faces the cylinder barrel, a first rolling bearing is installed in the large-diameter hole in the first stepped through hole, an inner ring of the first rolling bearing is connected with the lead screw in a sealing mode through a sealing shaft collar, the bearing gland is fixedly connected with the motor front end cover and is used for positioning an outer ring of the first rolling bearing, and the lead screw penetrates through the bearing gland, the sealing shaft collar, the first rolling bearing and the motor front end cover.
Preferably, a motor rear end cover is arranged at one end, away from the cylinder barrel, of the motor shell, a second stepped through hole is formed in the inner side of the motor rear end cover, the outer side of the motor rear end cover is of a stepped shaft structure, a second rolling bearing is arranged in a large-diameter hole of the second stepped through hole, a small-diameter hole of the second stepped through hole is formed in a small-diameter shaft section of the stepped shaft, and the lead screw penetrates through the second rolling bearing and the motor rear end cover; the outer side of the motor rear end cover is fixedly provided with an encoder, the screw rod penetrates through a central hole of the encoder, the outer side of the motor rear end cover is further provided with an encoder cover, the encoder cover is fixedly connected with the motor rear end cover, and the motor rear end cover and the encoder cover are provided with wire passing holes.
Preferably, the screw rod is a stepped shaft with at least three steps, a first shaft shoulder of the screw rod abuts against an inner ring of the second rolling bearing, a second shaft shoulder of the screw rod abuts against the edge of the rotor, and a third shaft shoulder of the screw rod abuts against the sealing shaft collar.
Preferably, the two ends of the cylinder barrel are provided with openings, one end of the cylinder barrel is hermetically connected with the bearing gland, the other end of the cylinder barrel is provided with a cylinder barrel end cover, the cylinder barrel end cover is provided with a through hole, the piston rod extends out of the cylinder barrel end cover through the through hole of the cylinder barrel end cover, and the cylinder barrel end cover is provided with a cylinder barrel silencer hole.
Preferably, a nut gland is fixedly arranged at one end of the screw rod nut, which faces the motor, the nut gland is coaxially arranged with the piston rod and is in sealing connection with the piston rod, and the periphery of the piston rod is sealed with the inner wall of the cylinder barrel.
Preferably, the vent hole is arranged on the bearing cover, a third stepped through hole is arranged on the bearing cover along the axial direction of the screw rod, and the vent hole is arranged in the circumferential direction of a large-diameter hole of the third stepped through hole; one end of the nut gland, facing the bearing gland, is arranged to be of a stepped shaft structure matched with the large-diameter hole of the third stepped through hole, when the piston rod retracts to the limit position, the nut gland and the bearing gland are sealed through a buffer sealing ring, and the inner cavity of the piston rod is isolated from the rodless cavity of the cylinder barrel.
Preferably, the piston rod is of a hollow structure, one end of the piston rod, which is far away from the screw rod nut, is sealed, and when the piston rod extends out, the inner cavity of the piston rod is communicated with the rodless cavity of the cylinder barrel.
Preferably, a piston rod vent hole is formed in one end, close to the screw nut, of the piston rod, a screw nut vent hole is formed in the screw nut, a nut gland vent groove is formed in the nut gland, and the inner cavity of the piston rod is communicated with the rodless cavity of the cylinder barrel through the piston rod vent hole, the screw nut vent hole and the nut gland vent groove in sequence.
The invention has the beneficial effects that: the short zero-length air-assisted electric cylinder device not only can reduce the design cost and the use cost, but also is particularly suitable for application occasions with large load and compact space, and can reduce the motion envelope space of equipment and further eliminate the possibility of interference between the equipment and peripheral facilities. Compared with the conventional electric cylinder structure, the electric cylinder structure has the characteristics of compact structure, zero length, high precision, pressure maintaining and buffering of the cylinder and the like, can reduce the design cost and the use cost, and effectively improves the thrust of the electric cylinder.
Drawings
FIG. 1 is a general view of the structure of the short zero-length pneumatic-assisted electric cylinder device of the present invention;
FIG. 2 is a cross-sectional view of the short zero-length pneumatic-assisted electric cylinder apparatus of the present invention;
FIG. 3 is a schematic view of the piston rod of the present invention in an extended position;
FIG. 4 is a schematic view of the piston rod of the present invention in a retracted state;
FIG. 5 is a schematic view of a bearing gland structure of the present invention;
FIG. 6 is a schematic view of the nut gland structure of the present invention;
FIG. 7 is a schematic cross-sectional view of a piston rod according to the present invention;
FIG. 8 is a schematic view of a feed screw nut according to the present invention;
FIG. 9 is a schematic view of the cylinder structure of the present invention;
fig. 10 is a schematic view of the structure of the housing of the motor of the present invention;
fig. 11 is a schematic structural view of the rear end cover of the motor of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the motor comprises a shell, 2, a stator, 3, a rotor, 4, a motor front end cover, 5, a motor rear end cover, 6, a screw rod, 7, a first rolling bearing, 8, a second rolling bearing, 9, an encoder, 10, an encoder cover, 11, an encoder pressure pad, 12, a first locking nut, 13, a second locking nut, 14, a sealing collar, 15, a bearing gland, 16, a nut gland, 17, a screw nut, 18, a piston rod, 19, a cylinder barrel, 20, a cylinder barrel end cover, 21, a front hinge fork, A, a bearing gland vent hole, B, a piston rod vent hole, C, a screw nut vent hole, D, a nut gland vent groove, E, a cylinder barrel silencer hole, F, a first wire passing hole, G, a second wire passing hole, H, a piston rod inner cavity, I, a cylinder barrel rodless cavity, J and a cylinder barrel with a rod cavity.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
The short zero-length gas-assisted electric cylinder device shown in fig. 1-2 comprises a motor and a cylinder body assembly which are coaxially arranged, wherein the motor comprises a shell 1, a stator 2 and a rotor 3 of the motor which are sequentially arranged from outside to inside, the stator 2 is fixedly arranged in the shell 1 of the motor, and the center of the rotor 3 is provided with a through hole; the cylinder body assembly comprises a cylinder barrel 19, a piston rod 18, a lead screw nut 17, a nut gland 16 and a lead screw 6, wherein the piston rod 18, the lead screw nut 17, the nut gland 16 and the lead screw 6 are coaxially arranged in the cylinder barrel 19, one end, close to the motor, of the cylinder barrel 19 is hermetically connected with a shell 1 of the motor, and the lead screw 6 penetrates through a through hole of the rotor 3 and is in interference fit with the rotor 3. The piston rod 18 is of a hollow structure, the piston rod 18, the screw rod nut 17 and the nut gland 16 are sequentially sleeved on the screw rod 6, and the screw rod nut 17 is in threaded fit with the screw rod 6 and performs spiral transmission through threads. One end of the piston rod 18 is fixedly connected with the screw rod nut 17, and the other end extends out of the cylinder 19. The periphery of the piston rod 18 is sealed with the cylinder barrel 19 through a sealing piece and can slide along the inner wall of the cylinder barrel 19, the piston rod 18 and the nut gland 16 are fixedly connected to clamp the screw rod nut 17 between the piston rod 18 and the nut gland, the cylinder barrel 19 is divided into a cylinder barrel rodless cavity I and a cylinder barrel rod cavity J by the piston rod 18, the cylinder barrel rodless cavity I is a sealing cavity, a vent hole is formed in the cavity wall of the cylinder barrel rodless cavity I, and the cylinder barrel rodless cavity I is connected with an external air-assisted system through the vent hole.
As shown in fig. 3 to 6, a bearing gland 15 and a motor front end cover 4 are fixedly arranged at one end of a housing 1 of the motor, which is close to the cylinder barrel 19, the bearing gland 15 is hermetically connected with the cylinder barrel 19, a first stepped through hole is arranged on the motor front end cover 4, a small-diameter hole on the first stepped through hole faces towards the motor, a large-diameter hole on the first stepped through hole faces towards the cylinder barrel 19, a first rolling bearing 7 is arranged in the large-diameter hole on the first stepped through hole, and the bearing gland 15 and the motor front end cover 4 are fixedly connected to position an outer ring of the first rolling bearing 7; the inner ring of the first rolling bearing 7 is connected with the screw rod 6 in a sealing mode through a sealing collar 14, and the sealing collar 14 is used for positioning the inner ring of the first rolling bearing 7. The screw rod 6 penetrates through the bearing gland 15, the sealing collar 14, the first rolling bearing 7 and the motor front end cover 4.
As shown in fig. 10 to 11, a motor rear end cover 5 is arranged at one end of the housing 1 of the motor, which is away from the cylinder barrel 19, a second stepped through hole is arranged at the inner side of the motor rear end cover 5, the outer side of the motor rear end cover 5 is of a stepped shaft structure, a large-diameter hole of the second stepped through hole faces the inner side of the motor, and a small-diameter hole of the second stepped through hole faces the outer side of the motor. A second rolling bearing 8 is arranged in a large-diameter hole of the second stepped through hole, the small-diameter hole of the second stepped through hole is arranged in a small-diameter shaft section of the stepped shaft, and the screw rod 6 penetrates through the second rolling bearing 8 and the motor rear end cover 5. The outer side of the motor rear end cover 5 is fixedly provided with an encoder 9, the lead screw 6 penetrates through a central hole of the encoder 9, the outer side of the motor rear end cover 5 is further provided with an encoder cover 10, the encoder cover 10 is fixedly connected with the motor rear end cover 5, and the motor rear end cover 5 and the encoder cover 10 are provided with wire passing holes. Specifically, a first wire passing hole F is formed in a shell 1 of the motor, a second wire passing hole G is formed in an encoder cover 10, a lead of an encoder 9 penetrates through the second wire passing hole G, and the lead is converged with a lead of a motor stator 2 and then led out through the first wire passing hole F.
As shown in fig. 2, the screw rod 6 is a stepped shaft having at least three steps, and a first shoulder of the screw rod 6 abuts against an inner ring of the second rolling bearing 8 to position the relative positions of the screw rod 6 and the second rolling bearing 8; the second shaft shoulder of the screw rod 6 is tightly abutted against the edge of the rotor 3 and used for limiting the relative position of the screw rod 6 and the rotor 3 in the assembling process of the motor rotor 3; the third shoulder of the screw 6 abuts against the sealing collar 14 for positioning the first rolling bearing 7. The third shaft shoulder of the screw rod 6 and the end face of the sealing collar 14 are axially sealed through a sealing element.
As shown in fig. 9, two ends of the cylinder 19 are open, one end of the cylinder is hermetically connected with the bearing gland 15, the other end of the cylinder is provided with a cylinder end cover 20, the cylinder end cover 20 is provided with a through hole, the piston rod 18 extends out of the cylinder end cover 20 through the through hole of the cylinder end cover 20, and the cylinder end cover 20 and the periphery of the piston rod 18 are sealed by a sealing member. Preferably, a cylinder muffler hole E is provided on the cylinder end cover 20. When the piston rod 18 moves towards the outside of the cylinder barrel 19, the muffler hole E of the cylinder barrel exhausts air to release pressure for the rod cavity J of the cylinder barrel; when the piston rod 18 moves outwards of the cylinder 19, the cylinder muffler hole E sucks air to pressurize the cylinder rod chamber J.
As shown in fig. 5, the vent hole is disposed on the bearing gland 15 (i.e., a bearing gland vent hole a), a third stepped through hole is disposed on the bearing gland 15 along the axial direction of the screw rod 6, and the bearing gland vent hole a is disposed at a large-diameter hole position of the third stepped through hole and penetrates through the bearing gland 15. As shown in fig. 8, the nut gland 16 is fixedly disposed at one end of the screw nut 17 facing the motor, the nut gland 16 is coaxially disposed and hermetically connected with the piston rod 18, the outer periphery of the piston rod 18 is sealed with the inner wall of the cylinder 19, and a space between the nut gland 16 and the bearing gland 15 in the cylinder 19 is a cylinder rodless chamber I. One end of the nut gland 16 facing the bearing gland 15 is provided with a stepped shaft structure matched with a large-diameter hole of the third stepped through hole, when the piston rod 18 retracts to a limit position, the nut gland 16 and the bearing gland 15 are sealed through a buffer sealing ring, and an inner cavity H of the piston rod is isolated from the rodless cavity I of the cylinder barrel; the piston rod 18 continues to retract, the volume of the rodless cavity I of the cylinder barrel is reduced, and air in the cavity is compressed to play a role in buffering.
As shown in fig. 2 and 7, the piston rod 18 is a hollow structure, one end of the piston rod 18 away from the feed screw nut 17 is connected with a front hinge fork 21, and the end of the piston rod 18 is sealed by the end of the front hinge fork 21. When the piston rod 18 extends out, the inner cavity H of the piston rod is communicated with the rodless cavity I of the cylinder barrel.
Specifically, a piston rod vent hole B is formed in one end, close to the screw nut 17, of the piston rod 18, a screw nut vent hole C is formed in the screw nut 17, a nut gland vent groove D is formed in the nut gland 16, and the inner cavity H of the piston rod is communicated with the rodless cavity I of the cylinder barrel through the piston rod vent hole B, the screw nut vent hole C and the nut gland vent groove D in sequence to form a vent loop in the device.
The working principle is as follows:
in this embodiment, the stator 2 is embedded in the housing 1 of the motor and then encapsulated as a whole. A first wire passing hole F is designed on a shell 1 of the motor, and a power wire and a coding wire are led out from the first wire passing hole F. The end surfaces of two sides of the shell 1 of the motor are respectively connected and fixed with the front end cover 4 of the motor and the rear end cover 5 of the motor. A first rolling bearing 7 is installed in an inner hole of the front end cover 4 of the motor, and the first rolling bearing 7 supports the screw rod 6 to rotate and bears the axial force and the radial force of the screw rod 6. The motor front end cover 4 is used for positioning the outer ring of one side of the first rolling bearing 7, and the bearing gland 15 is connected and fixed on the motor front end cover 4 and used for positioning the outer ring of the other side of the first rolling bearing 7. One side end face of the sealing collar 14 abuts against a shaft shoulder of the screw rod 6, the other side end face of the sealing collar positions an inner ring on one side of the first rolling bearing 7, and the inner ring on the other side of the first rolling bearing 7 is locked and fixed by a second locking nut 13. The central through hole of the rotor 3 is sleeved with the screw rod 6, circumferential fixation and transmission motion and torque are guaranteed through key connection, the shaft shoulder of the screw rod 6 axially positions the end face of one side of the rotor 3, and the end face of the other side of the rotor 3 is locked and fixed by the first locking nut 12. And a second rolling bearing 8 is arranged in a stepped hole of the rear end cover 5 of the motor so as to support the end part of the screw rod 6 to rotate. The shaft shoulder of the screw rod 6 positions the inner ring at one side of the second rolling bearing 8, and the rear end cover 5 of the motor positions the outer ring at the other side of the second rolling bearing 8. The encoder 9 is fixed on the rear end cover 5 of the motor, and a hollow hole of the encoder 9 is sleeved with a tail end shaft of the screw rod 6 so as to induce the rotary displacement of the screw rod 6. The encoder pressure pad 11 presses the end face of the encoder 9 and is locked and fixed with the screw rod 6 through a screw. The encoder cover 10 is fixed on the motor rear end cover 5. The rear end cover 5 of the motor is provided with a second wire passing hole G, and the coding wire is led into the shell 1 of the motor from the second wire passing hole G and led out through the first wire passing hole F. One end of the cylinder 19 is fixedly connected with the bearing gland 15, and the other end is provided with a cylinder end cover 20. The end of the cylinder 19 is circumferentially provided with a cylinder muffler hole E. The piston rod 18, the screw nut 17 and the nut gland 16 are fixedly connected through screws, and during assembly, attention needs to be paid to one-to-one correspondence of the piston rod vent hole B, the screw nut vent hole C and the nut gland vent groove D to form a vent loop. The end of the piston rod 18 is connected to the front fork 21 by a screw engagement.
The present embodiment may also be provided with a seal at the abutting face of the part as required. For example, the following sealing methods can be adopted: a toothed slip ring type combined seal ring is used between the bearing gland 15 and the seal collar 14, and the seal is suitable for hydraulic and pneumatic reciprocating and rotating motion. A buffer sealing ring is used between the bearing gland 15 and the nut gland 16, and the seal is used for a buffer function in the reciprocating cylinder. O-shaped rings are used between the cylinder 19 and the bearing gland 15, between the cylinder 19 and the cylinder end cover 20, between the nut gland 16 and the lead screw nut 17, and between the lead screw nut 17 and the piston rod 18. A COP air seal is used between the piston rod 18 and the cylinder 19. A dust seal is used between the piston rod 18 and the cylinder end cap 20. The sealing element and the structural member form closed cavities such as a cylinder rodless cavity I, a cylinder rod cavity J, a piston rod inner cavity H and the like.
The movement mode of the device of the embodiment is as follows:
when the motor runs, the rotor 3 rotates to drive the screw rod 6 to do rotary motion together, and the screw rod nut 17 converts the rotary motion into linear motion, so as to drive the piston rod 18 to do telescopic motion in the cylinder 19. When the screw rod 6 drives the piston rod 18 to extend out, the volume of a rodless cavity I of the cylinder barrel is increased, the volume of a rod cavity J of the cylinder barrel is reduced, and the air enters from the vent hole A of the bearing gland to provide certain thrust for the piston rod 18. When the piston rod 18 moves to a certain position and stops, the cylinder barrel rodless cavity I does not need to be charged again for pressurization, and the pressure maintaining effect is achieved. When the screw rod 6 drives the piston rod 18 to retract, the volume of the rodless cavity I of the cylinder barrel is reduced, the volume of the rod cavity J of the cylinder barrel is increased, and the vent hole A of the bearing gland is vented. When the piston rod 18 is about to retract to the lower limit position and the nut gland 16 is not in contact with the buffer sealing ring on the bearing gland 15, the inner cavity H of the piston rod is communicated with the rodless cavity I of the cylinder barrel. When the nut gland 16 and the buffer sealing ring start to contact, the inner cavity H of the piston rod is blocked with the rodless cavity I of the cylinder barrel, the piston rod 18 continues to retract, the volume of the rodless cavity I of the cylinder barrel is reduced, and air in the cavity is compressed to play a buffer role.
The device of this embodiment directly registrates the rotor 3 of motor on 6 axles of lead screw, and lead screw 6 has abandoned intermediate junction spare such as motor output shaft and shaft coupling as the output shaft of motor promptly, can improve the transmission precision. The rolling bearing is assembled on the front end cover 4 of the motor, the support screw rod 6 rotates and bears axial force and radial force, a motor mounting flange and a bearing seat are not needed, and the zero length of the electric cylinder is greatly shortened. In order to fully utilize the axial space to shorten the zero length of the electric cylinder, the rear end cover 5 of the motor is designed to be a sunken structure (namely a step-shaped through hole), a rolling bearing is assembled in the rear end cover 5 of the motor, and the end part of a support screw rod 6 rotates. An encoder 9 is fitted to the end of the lead screw 6 and screwed to the rear end cap 5 of the motor, which converts the rotational displacement into a series of digital pulse signals that can be used to feed back and control the angular displacement. When the rotor 3 rotates, the screw rod 6 is driven to do rotary motion, the screw rod nut 17 converts the rotary motion into reciprocating linear motion, and therefore the piston rod 18 connected with the screw rod nut 17 is driven to do telescopic motion in the cylinder 19. The electric cylinder is provided with a vent hole and an internal ventilation loop, and is connected with an air-assisted system consisting of a peripheral equipment air compressor, an air storage tank, a cold dryer and the like, so that the functions of pressure maintaining, buffering and force increasing are realized. The cylinder 19 is provided with a muffler which eliminates exhaust noise caused by a change in the internal volume of the cylinder 19. Meanwhile, cushion pads and oil pressure buffers can be further assembled at the front end part and the rear end part of the inner cavity of the cylinder barrel 19, and an additional buffering effect of an air auxiliary system is provided.
The short zero-length air-assisted electric cylinder device of the embodiment not only can reduce the design cost and the use cost, but also is particularly suitable for the application occasions with large load and compact space, and can reduce the motion envelope space of equipment and further eliminate the possibility of interference between the equipment and peripheral facilities. Compared with the conventional electric cylinder structure, the electric cylinder structure has the characteristics of compact structure, zero length, high precision, pressure maintaining and buffering of the cylinder and the like, can reduce the design cost and the use cost, and effectively improves the thrust of the electric cylinder.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The short zero-length gas-assisted electric cylinder device is characterized by comprising a motor and a cylinder body assembly which are coaxially arranged, wherein the cylinder body assembly comprises a cylinder barrel (19), and a screw rod (6), a screw rod nut (17) and a piston rod (18) which are coaxially arranged in the cylinder barrel (19); one end of the cylinder barrel (19) is hermetically connected with the shell (1) of the motor; one end of the screw rod (6) penetrates through a rotor (3) of the motor and is fixedly connected with the rotor (3); the screw rod nut (17) is sleeved outside the screw rod (6) and is in spiral transmission with the screw rod (6); the piston rod (18) is of a hollow structure, and the piston rod (18) is sleeved outside the screw rod (6) and is fixedly connected with the screw rod nut (17); the cylinder barrel (19) is divided into a cylinder barrel rod cavity (J) and a closed cylinder barrel rodless cavity (I) by the piston rod (18), and the cylinder barrel rodless cavity (I) is provided with a vent hole for being connected with an external air-assisted system.
2. The short zero-length gas-assisted electric cylinder device as claimed in claim 1, wherein a bearing gland (15) and a motor front end cover (4) are fixedly arranged at one end, close to the cylinder barrel (19), of the motor housing (1), the bearing gland (15) is hermetically connected with the cylinder barrel (19), a first stepped through hole is formed in the motor front end cover (4), a large-diameter hole in the first stepped through hole faces the cylinder barrel (19), a first rolling bearing (7) is installed in the large-diameter hole in the first stepped through hole, an inner ring of the first rolling bearing (7) is hermetically connected with the lead screw (6) through a sealing collar (14), the bearing gland (15) is fixedly connected with the motor front end cover (4) to position the first rolling bearing (7), and the lead screw (6) penetrates through the bearing gland (15), The sealing collar (14), the first rolling bearing (7) and the motor front end cover (4).
3. The short zero-length gas-assisted electric cylinder device as claimed in claim 2, wherein a motor rear end cover (5) is arranged at one end of the motor housing (1) away from the cylinder barrel (19), a second stepped through hole is arranged at the inner side of the motor rear end cover (5), a stepped shaft structure is arranged at the outer side of the motor rear end cover (5), a second rolling bearing (8) is arranged in a large-diameter hole of the second stepped through hole, a small-diameter hole of the second stepped through hole is arranged in a small-diameter shaft section of the stepped shaft, and the lead screw (6) penetrates through the second rolling bearing (8) and the motor rear end cover (5); the outer side of the motor rear end cover (5) is fixedly provided with an encoder (9), the screw rod (6) penetrates through a central hole of the encoder (9), the outer side of the motor rear end cover (5) is further provided with an encoder cover (10), the encoder cover (10) is fixedly connected with the motor rear end cover (5), and the motor rear end cover (5) and the encoder cover (10) are provided with wire passing holes.
4. The short zero-length gas-assisted electric cylinder device according to claim 3, characterized in that the screw rod (6) is a stepped shaft having at least three steps, a first shoulder of the screw rod (6) abuts against the inner ring of the second rolling bearing (8), a second shoulder of the screw rod (6) abuts against the edge of the rotor (3), and a third shoulder of the screw rod (6) abuts against the sealing collar (14).
5. The short zero-length pneumatic-assisted electric cylinder device as recited in claim 2, characterized in that the cylinder (19) is open at both ends, one end of the cylinder is hermetically connected with the bearing gland (15), the other end of the cylinder is provided with a cylinder end cover (20), the cylinder end cover (20) is provided with a through hole, the piston rod (18) extends out of the cylinder end cover (20) through the through hole of the cylinder end cover (20), and the cylinder end cover (20) is provided with a cylinder silencer hole (E).
6. The short zero-length gas-assisted electric cylinder device as recited in claim 2, characterized in that a nut gland (16) is further fixedly arranged at one end of the feed screw nut (17) facing the motor, the nut gland (16) is coaxially and hermetically connected with the piston rod (18), and the outer periphery of the piston rod (18) is hermetically sealed with the inner wall of the cylinder barrel (19).
7. The short zero-length gas-assisted electric cylinder device according to claim 6, characterized in that the vent hole is arranged on the bearing gland (15), a third step through hole is arranged on the bearing gland (15) along the axial direction of the screw rod (6), and the vent hole is arranged in the circumferential direction of the large-diameter hole of the third step through hole; the nut gland (16) is towards one end of the bearing gland (15) and is set to be in a stepped shaft structure matched with the large-diameter hole of the third stepped through hole, when the piston rod (18) retracts to the limit, the nut gland (16) and the bearing gland (15) are sealed through a buffer sealing ring, and the inner cavity (H) of the piston rod is isolated from the rodless cavity (I) of the cylinder barrel.
8. The short zero-length pneumatic-assisted electric cylinder device as recited in claim 6, characterized in that the end of the piston rod (18) facing away from the feed screw nut (17) is sealed, and when the piston rod (18) is extended, the piston rod inner chamber (H) is communicated with the cylinder rodless chamber (I).
9. The short zero-length pneumatic-assisted electric cylinder device according to claim 8, wherein a piston rod vent hole (B) is formed in one end, close to the feed screw nut (17), of the piston rod (18), a feed screw nut vent hole (C) is formed in the feed screw nut (17), a nut gland vent groove (D) is formed in the nut gland (16), and the piston rod inner cavity (H) is communicated with the cylinder rodless cavity (I) sequentially through the piston rod vent hole (B), the feed screw nut vent hole (C) and the nut gland vent groove (D).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110121592.2A CN113028014A (en) | 2021-01-28 | 2021-01-28 | Short zero-length gas-assisted electric cylinder device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110121592.2A CN113028014A (en) | 2021-01-28 | 2021-01-28 | Short zero-length gas-assisted electric cylinder device |
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| CN111786495A (en) * | 2020-06-29 | 2020-10-16 | 穆特科技（武汉）股份有限公司 | Short zero-length electric cylinder device |
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| US20050150730A1 (en) * | 2004-01-08 | 2005-07-14 | Huber Howard E.Jr. | Fluid actuator |
| WO2010089073A1 (en) * | 2009-02-06 | 2010-08-12 | Sew-Eurodrive Gmbh & Co. Kg | Spindle motor |
| CN106602789A (en) * | 2016-12-24 | 2017-04-26 | 上海交通大学 | Pneumatic and motor-hybrid driven linear actuator |
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Application publication date: 20210625 |
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