CN110230621B - Miniature digital oil cylinder - Google Patents
Miniature digital oil cylinder Download PDFInfo
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- CN110230621B CN110230621B CN201910548807.1A CN201910548807A CN110230621B CN 110230621 B CN110230621 B CN 110230621B CN 201910548807 A CN201910548807 A CN 201910548807A CN 110230621 B CN110230621 B CN 110230621B
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- 238000007789 sealing Methods 0.000 claims abstract description 16
- 230000033001 locomotion Effects 0.000 claims description 14
- 238000006073 displacement reaction Methods 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000003921 oil Substances 0.000 description 109
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000010687 lubricating oil Substances 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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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
-
- 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
- F15B15/1428—Cylinders
-
- 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
- F15B15/1447—Pistons; Piston to piston rod assemblies
-
- 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
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
-
- 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
- F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
-
- 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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/202—Externally-operated valves mounted in or on the actuator
-
- 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
- F15B21/08—Servomotor systems incorporating electrically operated control means
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Actuator (AREA)
Abstract
The invention relates to a miniature digital oil cylinder, a valve sleeve for installing a rotary sealing ring is matched and connected in a cylinder body, a wave spring is arranged between the end face of a circular groove at the rear part of a piston and the end face of an inner hole of the valve sleeve, a connecting shaft at the rear end of the valve sleeve is connected with an output shaft of a motor through a coupler, and the motor is fixedly connected with the cylinder body through a mounting seat; the valve sleeve is internally connected with a piston in a matched manner, the front end of the piston is connected with the cylinder body through a cushion sleeve, the piston and the cushion sleeve relatively move, an oil return cavity and a pressure oil cavity are respectively formed between the piston and two ends of the valve sleeve, the piston is provided with two spiral grooves and small holes, one small hole is communicated with the oil return cavity T to serve as a T port of the piston, the other small hole is communicated with the pressure oil cavity P to serve as a piston P port, and the two spiral grooves are communicated with the P port; the valve sleeve is provided with small holes, an oil return cavity communicated with one small hole is used as a valve sleeve T port, and a pressure oil cavity P cavity communicated with the other small hole is used as a valve sleeve P port; the end face of the cylinder body is provided with a pressure oil inlet which is communicated with the pressure oil cavity P through a piston P port.
Description
Technical Field
The invention relates to a digital control element of a miniature hydraulic cylinder, in particular to a miniature digital oil cylinder.
Background
The traditional hydraulic slide valve core control adopts an electromagnet or a torque motor to control the displacement of the valve core, the precision of the force or the torque output by the electromagnet or the torque motor is very poor (about 10%), the valve core must be corrected through feedback (position electric feedback LVDT or spring feedback) to achieve high-precision control, in addition, the output power of the electromagnet or the torque motor is very small, the large-flow valve core cannot be directly driven, and the problem can be solved only through multistage control, and the energy consumption is high. In particular to displacement control of an oil pump, the purpose of control is achieved by utilizing a complex structure of a spring and a valve, the energy consumption is larger, the precision is worse, the adjustment is difficult, and the purpose of accurate control cannot be achieved. As is well known, in recent years, the development speed of the electric control technology is far faster than that of the mechanical hydraulic control technology, so that the electric control technology has to be applied to the hydraulic technology, and the energy transmission (transmission) is really realized by hydraulic pressure, and the control is completely finished by electricity; if not, the field of hydraulic drive applications may be further greatly compressed by electric drives (which has been increasingly more the case in recent years, such as electric cylinders, etc.).
Based on the digital control technology of the existing oil cylinder, a new oil cylinder structure needs to be designed, and the miniature of the digital oil cylinder is realized by utilizing the stepping (or servo) control of a motor and driving the oil cylinder piston to generate miniature linear displacement through the miniature signal output of the motor.
Disclosure of Invention
The invention aims to provide a miniature digital oil cylinder which can realize electrohydraulic integrated control and mainly utilizes stepping (or servo) control of a motor, the rotation angle and the rotation speed of the motor can realize miniature digital signal output, a valve sleeve is driven to rotate by an output shaft of the motor, a high-pressure oil way is communicated, and the high-pressure oil way enters two cavities of a piston to generate pressure difference, so that the piston is pushed to perform reciprocating linear motion; the digital signal output by the motor and the small linear movement distance (position) of the oil cylinder piston are in a certain proportion relation, and finally the digital displacement output of the oil cylinder piston is realized; in practical application, the device can replace the control functions of the electromagnet and the force motor, and the output precision and the output power are higher than those of the electromagnet and the force motor.
In order to achieve the above purpose, the technical scheme of the invention is as follows: the miniature digital oil cylinder comprises a motor, a cylinder body, a valve sleeve and a piston, wherein the valve sleeve is internally matched and connected with a rotary sealing ring, the valve sleeve is axially and fixedly connected with the cylinder body through a clamping ring, a connecting shaft at the rear end of the valve sleeve is connected with an output shaft of the motor through a coupling, and the motor is fixedly connected with the cylinder body through a mounting seat; the mounting seat is fixed with the motor through the mounting plate; the piston is connected in a matched manner, a wave spring is arranged between the end face of a circular groove at the rear part of the piston and the end face of an inner hole of the valve sleeve, the front end of the piston is connected with the cylinder body through a cushion sleeve, the piston and the cushion sleeve move relatively, a plurality of steel balls are arranged between the piston and the cushion sleeve, an oil return cavity and a pressure oil cavity are respectively formed between the piston and the two ends of the valve sleeve, two spiral grooves and small holes are formed in the piston, one small hole is communicated with the oil return cavity T to serve as a T port of the piston, the other small hole is communicated with the pressure oil cavity P to serve as a piston P port, and the two spiral grooves are communicated with the piston P port; the valve sleeve is provided with small holes, one small hole is communicated with the oil return cavity to serve as a valve sleeve T port, and the other small hole is communicated with the pressure oil cavity P cavity to serve as a valve sleeve P port; the end face of the cylinder body is provided with a pressure oil inlet which is communicated with the pressure oil cavity P through a piston P port.
Further, the motor is a stepping motor or a servo motor with a driver.
Further, the miniature digital oil cylinder is connected with the controlled element through a screw, the digital quantity output of the linear motion of the piston is controlled through the digital quantity output of the rotation angle and the rotation speed of the motor, and the piston pushes the controlled element to realize digital displacement movement.
When the miniature digital oil cylinder does not work, the pressure oil enters the pressure oil cavity of the valve sleeve from the pressure oil outlet of the controlled element, the valve sleeve P port and the valve sleeve T port are respectively tangent with the spiral groove of the piston, the pressure oil enters the spiral groove and then enters the oil return cavity T through the spiral groove and the valve sleeve T port, one path enters the pressure oil cavity P through the piston P port, the pressure of the pressure oil cavity P is half of the pressure of the oil inlet, and the pressure of the valve core of the controlled element is equal to the pressure of the pressure oil cavity P, so that the piston does not move.
Further, when the miniature digital oil cylinder works, the motor rotates by an angle according to the instruction, the motor drives the piston to rotate by the same angle, pressure oil enters the spiral groove of the piston, oil at the port of the piston P completely enters the pressure oil cavity P, at the moment, the port of the valve sleeve T is not communicated with the spiral groove, the oil return port is closed, and the pressure oil cavity P pushes the piston and the valve core of the controlled element to move; after the piston moves, the spiral groove of the piston moves to a position tangential to the opening of the valve sleeve P, T, the pressure at the two ends of the piston is balanced again, and the piston stops moving.
Further, when the motor is reversed, the pressure oil port is closed, the pressure oil cavity P is communicated with the oil return cavity T through the spiral groove, the valve core pressure of the controlled element is larger than the pressure oil cavity P, the valve core pushes the piston to move, when the spiral groove of the piston moves to a position tangential to the valve sleeve P, T port, the pressure at the two ends of the piston is balanced again, and the piston stops moving.
The beneficial effects of the invention are as follows:
The invention organically combines electrohydraulic integrated control with a mechanical structure, fully utilizes the advantages of electric control, hydraulic and mechanical structures, and realizes the control function of the digital oil cylinder with lower cost.
The dynamic response time of the oil cylinder piston is controlled by controlling the stepping (or servo) motor and outputting a digital signal with high control precision and controlling the relation between the rotating speed of the motor and the working stroke of the piston, so that the working frequency of the piston is controlled and the quick response of the oil cylinder piston is realized. Meanwhile, the motor control signal can be combined with other control requirements of a system through PLC closed-loop control, so that artificial intelligent control is comprehensively realized.
By utilizing the working principle of hydraulic fluid mechanics tangential throttling edges and the relation between the flow and the pressure and the relation between the pressure and the area of hydraulic fluid, the pressure difference between the two ends of the piston is generated by controlling the area difference between the two ends of the piston, so that the reciprocating motion of the piston is realized.
By utilizing the working principle and the characteristics of the spiral line, through careful calculation, the digital signal output by the motor and the piston displacement value are mutually corresponding by controlling the starting position, the groove width and the pitch of the spiral groove of the piston, the starting angle of the small hole of the valve sleeve and the spiral groove of the piston, the full-overlap rotation angle and the full-overlap axial displacement, so that the digital displacement output of the piston of the oil cylinder is realized.
In summary, the miniature digital oil cylinder disclosed by the invention adopts a brand-new design concept, is compact in overall structure, convenient to control, low in cost, wide in application range, convenient to install and debug, fully utilizes the advantages of electromechanical and hydraulic integration, realizes the miniature and digital quantity output of the oil cylinder, and is high in control precision and output displacement precision, fast in dynamic response, stable and reliable in movement, strong in innovation and practicality, and good in effect in practical application.
Drawings
FIG. 1 is a front view of a miniature digital oil cylinder of the present invention;
FIG. 2 is a left side view of the miniature digital cylinder (with the guard plate removed);
FIG. 3 is a schematic view of a valve housing;
Wherein: (a) a main sectional view, (b) a sectional view A1-A1, (c) a sectional view A2-A2, and (d) a sectional view A3-A3;
FIG. 4 is a schematic diagram of a piston structure;
Wherein: (a) front view, (B) A-A cross-sectional view, (c) top view, (d) B1-B1 cross-sectional view, (e) B2-B2 cross-sectional view, (f) cross-sectional view.
Detailed Description
The invention will be further described with reference to the drawings and examples.
As shown in fig. 1 and 2, the miniature digital oil cylinder of the invention comprises a stepping (or servo) motor 1 (comprising a driver), a mounting seat 2, a mounting plate 3, a screw 4, a coupling 5, a cylinder body 6, a valve sleeve 7, a piston 8, a cushion sleeve 9, a sealing ring 10, a sealing ring 11, a screw 12, a steel ball 13, a screw plug 14, a set screw 15, a butt-top wave spring 16, a rotary sealing ring 17, a clamping ring 18, a protection plate 19 and a nut 20.
The cylinder body 6 is internally provided with a valve sleeve 7, a rotary sealing ring 17 is arranged in a sealing groove of the valve sleeve 7, a clamping ring 18 is clamped in a clamping ring groove at the rear end of the valve sleeve 7 and is fixedly connected with the axial direction of the cylinder body 6, a connecting shaft at the rear end of the valve sleeve 7 is connected with an output shaft of the stepping (or servo) motor 1 through a coupler 5, and the stepping (or servo) motor 1 is fixedly connected on the mounting seat 2 through the mounting plate 3 and is connected with the cylinder body 6 through the mounting seat 2. The valve sleeve 7 is internally matched and connected with a piston 8, a butt-jacking wave spring 16 is arranged between the end face of a circular groove at the rear part of the piston 8 and the end face of an inner hole of the valve sleeve 7, the front end of the piston 8 is connected with a cylinder body 6 through a cushion sleeve 9, the piston 8 and the cushion sleeve 9 move relatively, a plurality of steel balls 13 are arranged between the piston 8 and the cushion sleeve 9, a T cavity (oil return cavity) and a P cavity (pressure oil cavity) are respectively arranged between the piston 8 and the two ends of the valve sleeve 7, two spiral grooves and small holes are formed in the piston 8, one hole is communicated with the T cavity (oil return cavity) of the digital oil cylinder, the other hole is communicated with the P cavity (pressure oil cavity) of the digital oil cylinder, the other hole is communicated with the T cavity (oil return cavity) of the digital oil cylinder, and the other hole is communicated with the P cavity (pressure oil cavity) of the digital oil cylinder.
The miniature digital oil cylinder is used as a control part, the digital quantity output of the linear motion of the piston is controlled through the digital quantity output of the rotation angle and the rotation speed of the motor, and finally the piston pushes the controlled element to realize the digital displacement movement, and the miniature digital oil cylinder is generally used as a control stage of the axial movement position of the spool valve, and can push other elements with the linear motion requirement to work.
The protection plate 19 and the nut 20 only play a role in protection during transportation and storage, and are removed in actual use.
When the miniature digital oil cylinder controls other elements to be used, the screw 12 connects and fixes the digital oil cylinder and the controlled element into a whole, oil inlet and return of the digital oil cylinder are provided by the controlled element, and the sealing rings 10 and 11 ensure reliable sealing between the digital oil cylinder and the controlled element to prevent oil leakage.
The end face of the cylinder body 6 is provided with 2 pressure oil inlets P (see figure 2), one of the pressure oil inlets P is normally used, the other pressure oil inlet P is plugged, and the purpose of the two oil inlets is to ensure that the universality of the miniature digital oil cylinder is stronger.
The valve sleeve 7 is provided with small holes, one hole is communicated with a T-shaped cavity (oil return cavity) of the digital oil cylinder, which is called a T-shaped port, and the other hole is communicated with a P-shaped cavity (pressure oil cavity) of the digital oil cylinder, which is called a P-shaped port. The valve sleeve structure is schematically shown in figures 3 a-d.
The piston 8 is provided with spiral grooves and small holes, one hole is communicated with a T-shaped cavity (oil return cavity) of the digital oil cylinder, which is called a T-shaped opening, the other hole is communicated with a P-shaped cavity (pressure oil cavity) of the digital oil cylinder, which is called a P-shaped opening, and the two spiral grooves are communicated with the P-shaped opening. The schematic diagram of the piston structure is shown in fig. 4 a-f.
The specific implementation process of the invention comprises the following steps: see FIG. 1
(1) Step (or servo) motor connection assembly
The mounting base 2 is arranged on the stepping (or servo) motor 1, the mounting plate 3 is used for pressing the mounting base 2 on the end face of the stepping (or servo) motor 1, and the mounting base is fixed by the screw 4.
(2) Valve sleeve and cylinder body connecting assembly
The rotary sealing ring 17 is arranged in the sealing groove of the valve sleeve 7, and lubricating oil is coated on the inner hole of the cylinder body 6, so that the valve sleeve 7 and the rotary sealing ring 17 are prevented from being damaged in the assembly process.
And then the valve sleeve 7 is arranged in the cylinder body 6, finally the clamping ring 18 is clamped in the annular groove of the valve sleeve 7, and the valve sleeve 7 is rotated, so that the valve sleeve can rotate easily and freely, and the clamping stagnation phenomenon is avoided.
(3) The motor and the cylinder body are connected
The coupling 5 is arranged on the valve sleeve 7, the motor output shaft is aligned with the coupling groove, the stepping (or servo) motor 1 and the mounting seat 2 are screwed into the cylinder body 6 together, the valve sleeve 7 and the stepping (or servo) motor 1 can be rotated together in the screwing process, the rotation angles are the same, and after the output shaft of the stepping (or servo) motor 1 enters the coupling 5 groove, only the stepping (or servo) motor 1 body can be rotated until the mounting seat 2 is completely screwed into the cylinder body 6.
(4) Piston mounting
1) Firstly, the opposite-top wave spring 16 is arranged in a spring cavity of the valve sleeve 7, lubricating oil is coated on the outer circle of the piston 8, and then the piston 8 is arranged in the valve sleeve 7.
2) Lubricating oil is coated on the inner and outer circle positions of the cushion sleeve 9, the valve sleeve 9 is arranged in the cylinder body 6, and the valve sleeve 9 is rotated to align small holes on the outer circle of the valve sleeve with holes on the cylinder body.
3) The steel ball 13 is put into the small hole, then the steel ball 13 is rotated into the groove, and the steel ball 13 is continuously rotated until the steel ball 13 is fully filled in the groove, finally the set screw 15 is screwed in, the piston 8 is rotated (or moved back and forth), and the rotation and the forward and backward movement of the piston 8 are ensured to be free and free, and no clamping stagnation phenomenon exists.
(5) Accessory assembly
The screw plug 14 (with a sealing ring) is arranged on the process hole of the cylinder body 6, so that oil leakage is avoided.
The sealing rings 10, 11 are fitted into the sealing grooves of the cylinder 6.
The protection plate 19 is covered on the end surface of the cylinder body 6 and fixed by the screw 12 and the nut 20.
The working process (principle) of the invention is as follows:
When the digital oil cylinder is used, the outer end face of the piston of the oil cylinder is contacted with the end face of the valve core of the controlled element, and when the piston moves, the valve core can be pushed to move, otherwise, the valve core can also push the piston to move.
When the digital oil cylinder does not work, pressure oil enters the valve body P port from the controlled element through the cylinder body P port, the valve body P port is communicated with the valve sleeve P port, at the moment, the P port and the T port of the valve sleeve are respectively tangent with the spiral groove of the piston, the pressure oil enters the oil return cavity after entering the spiral groove, one path enters the oil return cavity through the spiral groove and the valve sleeve T port, and the other path enters the pressure cavity of the oil cylinder through the piston P port, and according to the principle of hydrodynamic tangent throttling edges, the pressure of the cavity of the oil cylinder P is half of the pressure of the oil inlet. At the moment, the valve core pressure of the controlled element is equal to the pressure of the P cavity of the oil cylinder (ensured by the design of a piston), and the piston does not move.
When the digital oil cylinder works, the motor receives an instruction to rotate by an angle, the motor drives the piston to rotate by the same angle, pressure oil sequentially passes through the P port of the cylinder body and the P port of the valve sleeve, the spiral groove of the piston and the oil passage of the P port of the piston all enter the P cavity of the oil cylinder, at the moment, the T port of the valve sleeve is not communicated with the spiral groove, the oil return port is closed, the pressure of the P cavity of the oil cylinder is twice greater than that of the original oil cylinder, the balance force at two ends of the piston is broken, the piston is pushed, and the piston pushes the valve core to move. After the piston moves, the spiral groove of the piston moves to a position tangential to the opening of the valve sleeve P, T, the pressures at the two ends of the piston are balanced again, and the piston stops moving.
When the motor rotates reversely, the pressure oil port is closed, the oil in the P cavity of the oil cylinder is communicated with the T cavity through the spiral groove, the valve core pressure of the controlled element is larger than the pressure in the P cavity of the oil cylinder, the valve core pushes the piston to move, and when the spiral groove of the piston moves to a position tangential to the opening of the valve sleeve P, T, the pressures at the two ends of the piston are balanced again, and the piston stops moving.
The positions and the initial angles of small holes at P, T ports on the valve sleeve 7 and P, T ports on the piston 8, the positions of the spiral grooves, the groove width, the screw pitch and the initial positions of the spiral grooves, including the initial angles of small holes of the valve sleeve and the spiral grooves of the piston, the full-overlapping rotation angle and the full-overlapping axial displacement are all obtained through detailed calculation and experimental verification, and are the key points for generating pressure change in a P cavity of the oil cylinder, pushing the piston to move and ensuring that the displacement of the piston movement is matched with a digital signal output by a motor.
The structure is an end face oil inlet structure, and the oil inlet and oil return plate type connecting structure from the bottom surface can be changed by changing the position of the oil port of the cylinder body 6, or the shape, the position and the connecting size of the cylinder body 6 can be changed according to other connecting requirements, so that the connecting requirements of various working conditions can be met.
Claims (6)
1. The utility model provides a miniature digital hydro-cylinder, includes motor, cylinder body, valve pocket, piston, its characterized in that: the cylinder body is internally matched and connected with a valve sleeve provided with a rotary sealing ring, the valve sleeve is axially and fixedly connected with the cylinder body through a clamping ring, a connecting shaft at the rear end of the valve sleeve is connected with an output shaft of a motor through a coupler, and the motor is fixedly connected with the cylinder body through a mounting seat; the mounting seat is fixed with the motor through the mounting plate; the piston is connected in a matched manner, a wave spring is arranged between the end face of a circular groove at the rear part of the piston and the end face of an inner hole of the valve sleeve, the front end of the piston is connected with the cylinder body through a cushion sleeve, the piston and the cushion sleeve move relatively, a plurality of steel balls are arranged between the piston and the cushion sleeve, an oil return cavity and a pressure oil cavity are respectively formed between the piston and the two ends of the valve sleeve, two spiral grooves and small holes are formed in the piston, one small hole is communicated with the oil return cavity T to serve as a T port of the piston, the other small hole is communicated with the pressure oil cavity P to serve as a piston P port, and the two spiral grooves are communicated with the piston P port; the valve sleeve is provided with small holes, one small hole is communicated with the oil return cavity to serve as a valve sleeve T port, and the other small hole is communicated with the pressure oil cavity P cavity to serve as a valve sleeve P port; the end face of the cylinder body is provided with a pressure oil inlet which is communicated with the pressure oil cavity P through a piston P port.
2. The miniature digital oil cylinder according to claim 1, wherein: the motor is a stepping motor or a servo motor with a driver.
3. The miniature digital oil cylinder according to claim 1, wherein: the miniature digital oil cylinder is connected with the controlled element through a screw, the digital quantity output of the linear motion of the piston is controlled through the digital quantity output of the rotation angle and the rotation speed of the motor, and the piston pushes the controlled element to realize digital displacement movement.
4. A miniature digital hydro-cylinder as defined by claim 3, wherein: when the miniature digital oil cylinder does not work, pressure oil enters a pressure oil cavity of a valve sleeve from a pressure oil output port of a controlled element, a valve sleeve P port and a valve sleeve T port are respectively tangent with a spiral groove of a piston, the pressure oil enters the spiral groove and then enters an oil return cavity T through the spiral groove and the valve sleeve T port, one path enters the pressure oil cavity P through the piston P port, the pressure of the pressure oil cavity P is half of the pressure of oil inlet, and the pressure of a valve core of the controlled element is equal to the pressure of the pressure oil cavity P, so that the piston does not move.
5. A miniature digital hydro-cylinder as defined by claim 3, wherein: when the miniature digital oil cylinder works, the motor rotates by an angle according to an instruction, the motor drives the piston to rotate by the same angle, pressure oil enters a piston spiral groove, oil at a port of the piston P completely enters a pressure oil cavity P, at the moment, a valve sleeve port T is not communicated with the spiral groove, an oil return port is closed, and the pressure oil cavity P pushes the piston and a valve core of a controlled element to move; after the piston moves, the spiral groove of the piston moves to a position tangential to the opening of the valve sleeve P, T, the pressure at the two ends of the piston is balanced again, and the piston stops moving.
6. A miniature digital hydro-cylinder as defined by claim 3, wherein: when the motor rotates reversely, the pressure oil port is closed, the pressure oil cavity P is communicated with the oil return cavity T through the spiral groove, the valve core pressure of the controlled element is larger than the pressure of the pressure oil cavity P, the valve core pushes the piston to move, when the spiral groove of the piston moves to a position tangential to the valve sleeve P, T, the pressure at the two ends of the piston is balanced again, and the piston stops moving.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910548807.1A CN110230621B (en) | 2019-06-24 | 2019-06-24 | Miniature digital oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910548807.1A CN110230621B (en) | 2019-06-24 | 2019-06-24 | Miniature digital oil cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110230621A CN110230621A (en) | 2019-09-13 |
| CN110230621B true CN110230621B (en) | 2024-05-07 |
Family
ID=67857117
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| Application Number | Title | Priority Date | Filing Date |
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|---|---|---|---|---|
| US4674539A (en) * | 1986-02-20 | 1987-06-23 | Sloate Harry M | Rotary servo valve |
| CN1724882A (en) * | 2004-07-22 | 2006-01-25 | 杨世祥 | Two-stage screw internal foodback digital fluid cylinder |
| CN101666341A (en) * | 2009-09-25 | 2010-03-10 | 浙江工业大学 | High frequency large flow 2D digital servo valve |
| CN203239673U (en) * | 2013-03-12 | 2013-10-16 | 浙江海洋学院 | Servo hydraulic cylinder |
| CN108317121A (en) * | 2018-04-13 | 2018-07-24 | 北京亿美博科技有限公司 | A kind of New Digital Hydraulic Servo Cylinder |
| CN210440310U (en) * | 2019-06-24 | 2020-05-01 | 上海衡拓液压控制技术有限公司 | Miniature digital oil cylinder |
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2019
- 2019-06-24 CN CN201910548807.1A patent/CN110230621B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4674539A (en) * | 1986-02-20 | 1987-06-23 | Sloate Harry M | Rotary servo valve |
| CN1724882A (en) * | 2004-07-22 | 2006-01-25 | 杨世祥 | Two-stage screw internal foodback digital fluid cylinder |
| CN101666341A (en) * | 2009-09-25 | 2010-03-10 | 浙江工业大学 | High frequency large flow 2D digital servo valve |
| CN203239673U (en) * | 2013-03-12 | 2013-10-16 | 浙江海洋学院 | Servo hydraulic cylinder |
| CN108317121A (en) * | 2018-04-13 | 2018-07-24 | 北京亿美博科技有限公司 | A kind of New Digital Hydraulic Servo Cylinder |
| CN210440310U (en) * | 2019-06-24 | 2020-05-01 | 上海衡拓液压控制技术有限公司 | Miniature digital oil cylinder |
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| CN110230621A (en) | 2019-09-13 |
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