CN114704523A - Driving variable hydraulic cylinder and control method thereof - Google Patents
Driving variable hydraulic cylinder and control method thereof Download PDFInfo
- Publication number
- CN114704523A CN114704523A CN202210389844.4A CN202210389844A CN114704523A CN 114704523 A CN114704523 A CN 114704523A CN 202210389844 A CN202210389844 A CN 202210389844A CN 114704523 A CN114704523 A CN 114704523A
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- piston
- rod
- piston rod
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- cylinder
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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
- F15B15/1409—Characterised by the construction of the motor unit of the straight-cylinder type with two or more independently movable working pistons
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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
- F15B15/1428—Cylinders
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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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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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
- F15B2015/1495—Characterised by the construction of the motor unit of the straight-cylinder type with screw mechanism attached to the piston
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The invention relates to the technical field related to hydraulic cylinders, and discloses a variable driving hydraulic cylinder and a control method thereof. This application is synthesized pneumatic cylinder hydraulic control's advantage and automatically controlled components and parts's advantage, when using hydraulic pressure as the drive mode, job stabilization is reliable, is fit for batch control, through the setting in vice piston chamber, under the well load condition, the piston rod stretches out the same distance, and the hydraulic oil that uses the required pump of vice piston chamber to go into is obviously less than the hydraulic oil that uses the required pump of main piston chamber to go into, reduces oil pump operating time and load.
Description
Technical Field
The invention relates to the technical field related to hydraulic cylinders, in particular to a driving variable hydraulic cylinder and a control method thereof.
Background
The hydraulic cylinder is used as an actuating element of a hydraulic system, has the characteristics of simple transmission structure, flexible action, capability of transferring acting force and the like, and is widely used in engineering machinery. However, the hydraulic cylinder is generally suitable for being used in the scenes of single load, general response speed and batch control, which are caused by the characteristics of the hydraulic cylinder, and the traditional hydraulic cylinder is difficult to achieve a better adaptive effect in the scenes of variable load, high response speed and movement speed requirements and convenience in control.
Disclosure of Invention
It is an object of the present invention to provide a driving variable hydraulic cylinder and a control method thereof for overcoming the above problems.
The invention is realized by the following technical scheme.
The variable driving hydraulic cylinder comprises a cylinder body, wherein a main piston cavity is formed in the cylinder body, a piston rod module and a first piston are arranged in the main piston cavity, the first piston is connected with the piston rod module, the piston rod module is arranged in a hollow mode, a screw rod is arranged in the cylinder body and is located in the piston rod module, a screw rod nut is arranged on the screw rod and is connected with the piston rod module or the first piston, a power assembly is arranged in the cylinder body and is connected with the screw rod, and the power assembly is used for driving the screw rod to rotate.
Furthermore, an auxiliary piston cavity is arranged in the lead screw, an auxiliary piston rod and an auxiliary piston are arranged in the auxiliary piston cavity, the piston rod module comprises an inner rod and an outer rod, the outer rod and the inner rod are installed in a nested mode and can slide relatively, and the auxiliary piston rod is connected with the outer rod.
Furthermore, the first piston is connected with the inner rod, and the outer rod is provided with a second piston.
Furthermore, the second piston is provided with an oil through hole which penetrates through the second piston.
Furthermore, the auxiliary piston rod is rotatably connected with a mounting seat, and the mounting seat is connected with the outer rod.
Further, the power assembly comprises a motor, the motor is connected with the screw rod through a transmission mechanism, and the transmission mechanism is a gear mechanism.
Further, the motor is a self-locking motor.
Furthermore, a rotary sealing assembly is arranged on the screw rod, and an oil inlet of the auxiliary piston cavity is connected to the rotary sealing assembly.
A control method for driving a variable hydraulic cylinder is based on the variable hydraulic cylinder, and under a conventional working state, oil enters a main piston cavity to push a first piston to move, so that a piston rod module is contracted or extended, and the working state is suitable for a medium load condition;
under the heavy load condition, the oil pump feeds oil into the main piston cavity, the power assembly is started to enable the screw rod to rotate, and the piston rod module is driven under the action of the first piston and the screw rod nut;
under the condition of light load, only the power assembly is started, and the piston rod module is driven to act through the rotation of the screw rod.
Further, under the light load condition, the oil pump takes oil into the auxiliary piston cavity, and the auxiliary piston rod drives the outer rod to act.
The invention has the beneficial effects that:
this application synthesizes pneumatic cylinder hydraulic control's advantage and automatically controlled components and parts's advantage, when using hydraulic pressure as the drive mode, job stabilization is reliable, be fit for batch control, but traditional pneumatic cylinder is because its jar internal diameter has been fixed, under the condition of load frequent change, be difficult to realize adjusting the adaptation, and this application is through the setting in vice piston chamber, under the well load condition, the piston rod stretches out the same distance, the hydraulic oil that uses the required pump of vice piston chamber to go into is obviously less than the hydraulic oil that uses the required pump of main piston chamber to go into, reduce oil pump operating time and load, and the increase of service life, and, under the unchangeable condition of oil pump income oil mass, use vice piston chamber to realize faster motion and corresponding speed, make the whole working property numerical value of pneumatic cylinder have great scope, improve application scope.
Under the scene that needs accuracy and nimble control, hydraulic system is inferior to electron, electrical equipment to functions such as mathematical operation, error detection, enlargies and compensation of miniwatt signal, make hydraulic system have great gap than the electromechanical system in the aspect of realizing complicated motion, and the control degree of difficulty is also higher, through the setting of power pack and lead screw, make the pneumatic cylinder of this application have the characteristics nimble, linearity, the accuracy is high, solved the restriction that traditional pneumatic cylinder can only be used in the power part, make it can use in quick response and the scene that needs accurate control. Through the arrangement of the screw rod and the power assembly, the effects of position keeping, quick response, accurate control and the like of the hydraulic cylinder are achieved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
The invention is further illustrated by the following examples in conjunction with the drawings.
FIG. 1 is a cross-sectional view of an actuating variable hydraulic cylinder;
FIG. 2 is a schematic view of the outer rod in its extended configuration;
fig. 3 is a schematic structural diagram of the piston rod module.
Detailed Description
The present invention is described in detail below with reference to fig. 1-3.
The variable driving hydraulic cylinder comprises a cylinder body 1, wherein a cylinder cover 12 is installed on the cylinder body 1, a sealing assembly is installed between the cylinder cover 12 and a piston rod module 2, at least four oil pipes 11 are arranged on the cylinder body 1 and are respectively connected with a rod cavity and a rodless cavity in a main piston cavity 10 and an auxiliary piston cavity 34, the cylinder body 1 is preferably an aluminum alloy cylinder body, and an oil way extends in the cylinder body.
Be equipped with main piston chamber 10 in the cylinder body 1, be equipped with piston rod module 2 and first piston 4 in the main piston chamber 10, first piston 4 with piston rod module 2 is connected, piston rod module 2 is thick wall cavity setting, be equipped with lead screw 3 in the cylinder body 1, auto-lock lead screw or non-auto-lock lead screw all can, preferably ball screw, lead screw 3 is located in the piston rod module 2, be equipped with screw-nut 31 on the lead screw 3, screw-nut 31 with piston rod module 2 or first piston 4 is connected, and in this embodiment, screw-nut 31 is connected with main piston 4, be equipped with power component in the cylinder body 1, power component with lead screw 3 is connected, power component is used for the drive lead screw 3 rotates.
The power assembly comprises a motor 42, the motor 42 is connected with the screw rod 3 through a transmission mechanism, the transmission mechanism is a gear mechanism, the gear mechanism comprises a first gear 4 arranged on the screw rod 3, the first gear 4 is meshed with a second gear 41, the motor 42 is arranged in the cylinder body or outside the cylinder body, and a shaft of the second gear 41 is fixedly or detachably connected with the motor.
The motor 42 is a self-locking motor, when the hydraulic cylinder needs to be kept at a position, the motor 42 is self-locked, the screw rod is prevented from rotating, and therefore hydraulic oil leakage is avoided, and the position of the piston rod is prevented from changing.
Be equipped with vice piston chamber 34 in the lead screw 3, be equipped with vice piston rod 32 and vice piston in the vice piston chamber 34, piston rod module 2 includes interior pole 21 and outer pole 20, outer pole 20 with but interior pole 21 nested installation and relative slip, vice piston rod 32 with outer pole 20 is connected, because vice piston chamber 34 diameter is less than main piston chamber 10 diameter, under the unchangeable condition of oil pump oil power, stretches out or the start efficiency of shrink through vice piston chamber 34 drive outer pole 20 is higher, and the velocity of motion is faster, is fit for the condition of moderate load and batch control.
The first piston 4 is connected with the inner rod 21, the outer rod 20 is provided with a second piston 41, when oil is injected into the rod cavity, the inner rod 21 retracts, and the outer rod 20 can not retract and can not retract synchronously under the action of friction force, so that under the action of the second piston, the second piston is stressed when retracting, and the synchronous motion of the inner rod and the outer rod is ensured.
Preferably, the second piston 41 is provided with an oil hole penetrating through the second piston 41, when the auxiliary piston rod 32 drives the outer rod 20 to extend, the hydraulic oil in the rod cavity of the main piston cavity 10 is pushed out through the second piston 41, and the hydraulic oil is returned to the oil tank through the oil path, so that when the hydraulic cylinders in the present application are arranged in batches, a detection component can be arranged at the load end of each hydraulic cylinder for detecting the load size, such as a pressure sensor, a weight sensor and the like, a proper operation mode is selected according to the current load, the hydraulic oil amount in the conventional oil tank at least meets the required amount when all the hydraulic cylinders move synchronously, and the hydraulic cylinders in the present application only need to use the auxiliary piston cavity 34 because some hydraulic cylinders can meet the requirement of the movement distance only need to use less hydraulic oil, therefore, the total oil amount in the oil tank can be less than the total required oil amount of all the hydraulic cylinders, and further reduce the volume of the oil tank, the application range is improved, and the oil inlet is arranged between the first piston and the second piston due to the arrangement of the oil through hole, so that a vacuum state is prevented from being formed between the first piston and the second piston.
Preferably, the auxiliary piston rod 32 is rotatably connected with the mounting seat 33, and the mounting seat 33 is connected with the outer rod 20, so that the outer rod 20 is prevented from rotating and affecting the sealing effect.
As shown in fig. 1, a rotary seal assembly 5 is arranged on the screw rod 3, and an oil inlet of the secondary piston cavity 34 is connected to the rotary seal assembly 5.
This application synthesizes pneumatic cylinder hydraulic control's advantage and automatically controlled components and parts's advantage, when using hydraulic pressure as the drive mode, job stabilization is reliable, be fit for batch control, but traditional pneumatic cylinder is because its jar internal diameter has been fixed, under the condition of load frequent change, be difficult to realize adjusting the adaptation, and this application is through the setting of vice piston chamber 34, under the well load condition, the piston rod stretches out the same distance, the hydraulic oil that uses the required pump of vice piston chamber 34 to go into is obviously less than the hydraulic oil that uses the required pump of main piston chamber 10 to go into, reduce oil pump operating time and load, and prolonged service life, and, under the unchangeable condition of oil pump income oil mass, use vice piston chamber to realize faster motion and corresponding speed, make the whole working property numerical value of pneumatic cylinder have a great scope, application scope is improved.
Under the scene that needs accuracy and nimble control, hydraulic system is inferior to electron, electrical equipment to functions such as mathematical operation, error detection, enlargies and compensation of miniwatt signal, make hydraulic system have great gap than the electromechanical system in the aspect of realizing complicated motion, and the control degree of difficulty is also higher, through the setting of power pack and lead screw, make the pneumatic cylinder of this application have the characteristics nimble, linearity, the accuracy is high, solved the restriction that traditional pneumatic cylinder can only be used in the power part, make it can use in quick response and the scene that needs accurate control. Through the arrangement of the screw rod and the power assembly, the effects of position keeping, quick response, accurate control and the like of the hydraulic cylinder are achieved.
And the power assembly and the hydraulic system can be synchronously started to drive the piston rod to move, so that the piston rod can drive a larger load, and meanwhile, the two sets of power systems are matched with each other, so that the effect of mutual calibration can be realized, and a more accurate control effect is achieved.
The hydraulic cylinder is suitable for use in a variable load and operation environment, and is suitable for use in a carrying mechanism and the like in an action assembly needing interaction.
A control method for driving a variable hydraulic cylinder is based on the variable hydraulic cylinder, in a conventional working state, oil enters a main piston cavity 10 to push a first piston 4 to move, so that a piston rod module 2 contracts or extends, and the working state is suitable for the condition of medium load;
under the heavy load condition, the oil pump feeds oil into the main piston cavity 10, the power assembly is started to enable the screw rod 3 to rotate, and the piston rod module 2 is driven under the action of the first piston 4 and the screw rod nut 31;
under the condition of light load, only the power assembly is started, and the piston rod module 2 is driven to act through the rotation of the screw rod 3.
Further, under light load, the oil pump takes oil into the auxiliary piston chamber 34, and the auxiliary piston rod 32 drives the outer rod 20 to move.
Heavy load > medium load > light load, generally, two thirds of the required power which is larger than the maximum hydraulic driving power of the hydraulic cylinder is heavy load, the required power is larger than one third of the maximum hydraulic driving power, the medium load is when the required power is smaller than two thirds of the maximum hydraulic driving power, the light load is when the required power is smaller than one third of the maximum hydraulic driving power, the required power of the light load and the light load can be the same, under the scene needing accurate and flexible control, only the power assembly is started, and the piston rod module 2 is driven to act through the rotation of the screw rod 3.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. A drive variable hydraulic cylinder characterized by: including cylinder body (1), be equipped with main piston chamber (10) in cylinder body (1), be equipped with piston rod module (2) and first piston (4) in main piston chamber (10), first piston (4) with piston rod module (2) are connected, piston rod module (2) set up for cavity, be equipped with lead screw (3) in cylinder body (1), lead screw (3) are located in piston rod module (2), be equipped with screw-nut (31) on lead screw (3), screw-nut (31) with piston rod module (2) or first piston (4) are connected, be equipped with power pack in cylinder body (1), power pack with lead screw (3) are connected, power pack is used for the drive lead screw (3) rotate.
2. A driving variable cylinder as defined in claim 1, wherein: be equipped with vice piston chamber (34) in lead screw (3), be equipped with vice piston rod (32) and vice piston in vice piston chamber (34), piston rod module (2) are including interior pole (21) and outer pole (20), outer pole (20) with but relative sliding is installed in interior pole (21) nestification, vice piston rod (32) with outer pole (20) are connected.
3. A driving variable cylinder as defined in claim 2, wherein: the first piston (4) is connected with the inner rod (21), and the outer rod (20) is provided with a second piston (41).
4. A driving variable cylinder as defined in claim 3, wherein: and the second piston (41) is provided with an oil through hole which penetrates through the second piston.
5. The driving variable hydraulic cylinder as recited in any one of claims 2 to 4, wherein: the auxiliary piston rod (32) is rotatably connected with a mounting seat (33), and the mounting seat (33) is connected with the outer rod (20).
6. The driving variable hydraulic cylinder as recited in any one of claims 1 to 4, wherein: the power assembly comprises a motor (42), the motor (42) is connected with the screw rod (3) through a transmission mechanism, and the transmission mechanism is a gear mechanism.
7. The actuating variable cylinder as set forth in claim 6, wherein: the motor (42) is a self-locking motor.
8. The driving variable hydraulic cylinder as recited in any one of claims 2 to 4, wherein: the rotary sealing assembly (5) is arranged on the screw rod (3), and an oil inlet of the auxiliary piston cavity (34) is connected to the rotary sealing assembly (5).
9. A control method of a driving variable cylinder, based on any one of claims 1 to 8, characterized in that: in a conventional working state, oil is fed into the main piston cavity (10) to push the first piston (4) to move, so that the piston rod module (2) contracts or extends, and the working state is suitable for the condition of medium load;
under the heavy load condition, an oil pump feeds oil into a main piston cavity (10), a power assembly is started to enable a screw rod (3) to rotate, and a piston rod module (2) is driven under the action of a first piston (4) and a screw rod nut (31);
under the condition of light load, only the power assembly is started, and the piston rod module (2) is driven to act through the rotation of the screw rod (3).
10. The control method of driving the variable hydraulic cylinder according to claim 9, characterized in that: under the condition of light load, the oil pump feeds oil into the auxiliary piston cavity (34), and the auxiliary piston rod (32) drives the outer rod (20) to act.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210389844.4A CN114704523A (en) | 2022-04-14 | 2022-04-14 | Driving variable hydraulic cylinder and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210389844.4A CN114704523A (en) | 2022-04-14 | 2022-04-14 | Driving variable hydraulic cylinder and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN114704523A true CN114704523A (en) | 2022-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210389844.4A Pending CN114704523A (en) | 2022-04-14 | 2022-04-14 | Driving variable hydraulic cylinder and control method thereof |
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| CN (1) | CN114704523A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117905751A (en) * | 2024-03-18 | 2024-04-19 | 娄底光华机械设备制造有限公司 | Simple energy-saving hydraulic cylinder with variable stroke and use method thereof |
-
2022
- 2022-04-14 CN CN202210389844.4A patent/CN114704523A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117905751A (en) * | 2024-03-18 | 2024-04-19 | 娄底光华机械设备制造有限公司 | Simple energy-saving hydraulic cylinder with variable stroke and use method thereof |
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