CN114857125A - Pushing centrifuge hydraulic system for controlling oil cylinder reversing by utilizing oil cylinder stroke - Google Patents

Pushing centrifuge hydraulic system for controlling oil cylinder reversing by utilizing oil cylinder stroke Download PDF

Info

Publication number
CN114857125A
CN114857125A CN202210469212.9A CN202210469212A CN114857125A CN 114857125 A CN114857125 A CN 114857125A CN 202210469212 A CN202210469212 A CN 202210469212A CN 114857125 A CN114857125 A CN 114857125A
Authority
CN
China
Prior art keywords
oil
reversing
stroke
oil cylinder
reversing valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210469212.9A
Other languages
Chinese (zh)
Inventor
章伟达
陶渊卿
陆斌
吕丽珍
赵瑶华
王慧剑
杨晓军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Qingji Centrifuge Manufacturing Co ltd
Original Assignee
Zhejiang Qingji Centrifuge Manufacturing Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang Qingji Centrifuge Manufacturing Co ltd filed Critical Zhejiang Qingji Centrifuge Manufacturing Co ltd
Priority to CN202210469212.9A priority Critical patent/CN114857125A/en
Publication of CN114857125A publication Critical patent/CN114857125A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
    • 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
    • F15B15/1471—Guiding means other than in the end cap
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Abstract

The invention discloses a hydraulic system of a material-pushing centrifuge, which utilizes the stroke of an oil cylinder to control the reversing of the oil cylinder, and is characterized in that a main oil path for the work of a piston in the oil cylinder is led to the outside of the oil cylinder and is provided with a reversing valve in the effective stroke of a material-pushing shaft, and meanwhile, the axial motion of the piston is output to a stroke reversing mechanism along the reverse direction of the material-pushing shaft by taking the piston as a reference; the reversing valve is communicated with the stroke reversing mechanism through a reversing oil way, wherein the stroke reversing mechanism is provided with an oil drainage negative pressure station and a station which forms an oil loop with the reversing valve; the reversing valve obtains reversing pressure through the area difference of two ends of the valve core in the isobaric oil path. The oil cylinder is provided with a hydraulic loop, the reversing control mechanism is arranged, the dynamic information of the piston is directly transmitted to the control system, the direction change of an oil path is obtained through the artificially set pressure difference, the structure is simple and reliable, and the pushing stroke is stable.

Description

Pushing centrifuge hydraulic system for controlling oil cylinder reversing by utilizing oil cylinder stroke
Technical Field
The invention relates to a centrifuge manufacturing technology, in particular to a hydraulic system of a pusher centrifuge, which controls the reversing of an oil cylinder by utilizing the stroke of the oil cylinder.
Background
The reversing and pushing mechanism of the piston pusher centrifuge comprises a proximity switch, an oil cylinder, a piston, a pushing device, an electro-hydraulic reversing valve, a constant delivery pump and an oil tank, wherein the piston is arranged in the oil cylinder, one side of the piston is fixedly provided with a guide rod, the other side of the piston is connected with the pushing device, one end of the guide rod, which is positioned at the outer side of the oil cylinder, is provided with an induction device, and two proximity switches are arranged below the guide rod at a certain distance; the oil cylinder is connected with an electro-hydraulic reversing valve through an oil inlet and an oil return port, an oil inlet interface of the electro-hydraulic reversing valve is connected with the oil tank through a metering pump and an oil conveying pipe, and an oil outlet interface of the electro-hydraulic reversing valve is connected with the oil tank through a pipeline. The electromagnetic valve is controlled to be switched by an electric signal, so that the electromagnetic valve with high frequency action is easy to damage, and has high noise and high energy consumption. In addition, in practical application, the internal design of the cylinder body which uses the stroke of the oil cylinder to switch the oil path and control the reversing valve to reverse is also utilized, but the existing structures have obvious defects: if the guide plunger and the front and rear piston discs generate overlarge gaps due to abrasion, the guide plunger is impacted due to the high running speed of the piston in the running process, the control oil passage is communicated with the cavity end of the oil cylinder in advance, so that the reversing sleeve is reversed in advance, and the pushing stroke is shortened. In addition, the structures have high requirements on manufacturing precision and complex structures, and are difficult to judge when faults occur.
Disclosure of Invention
The hydraulic reversing mechanism of the piston pushing centrifuge is designed by a built-in controller of the pushing stroke, controls a reversing valve to reverse an oil cylinder, gets rid of the application of a traditional electromagnetic valve, and has the characteristics of stable pushing stroke, simple structure, convenience in maintenance and the like.
The technical problem of the invention is mainly solved by the following technical scheme: the utility model provides an utilize hydro-cylinder stroke control hydro-cylinder switching-over to push away material centrifuge hydraulic system which characterized by: in the effective stroke of the material pushing shaft, a main oil path for the work of a piston in the oil cylinder is led to the outside of the oil cylinder, a reversing valve is arranged, and meanwhile, the axial motion of the piston is output to a stroke reversing mechanism along the reverse direction of the material pushing shaft by taking the piston as a reference; the reversing valve is communicated with the stroke reversing mechanism through a reversing oil way, wherein the stroke reversing mechanism is provided with an oil drainage negative pressure station and a station which forms an oil loop with the reversing valve; the reversing valve obtains reversing pressure through the area difference of two ends of the valve core in the isobaric oil path.
In the above-mentioned hydraulic system for a pusher centrifuge, which controls the direction change of the cylinder by using the stroke of the cylinder, preferably, the effective stroke of the pusher shaft is the distance between the pusher shaft fully retracted to the starting point and fully extended to the limit position.
In the above-mentioned hydraulic system for a pusher centrifuge, which uses the stroke of the cylinder to control the reversing of the cylinder, preferably, the pusher shaft is positioned in the stroke control frame by the stroke control sleeve, the pusher shaft and the stroke control sleeve make relative axial movement, and the stroke control sleeve and the stroke control frame provide an oil drainage negative pressure oil duct and an oil duct forming an oil loop with the reversing valve.
In the above-mentioned hydraulic system for a pusher centrifuge, which controls the direction change of the oil cylinder by using the stroke of the oil cylinder, preferably, the direction change valve includes a direction change valve body, a direction change valve left cavity and a direction change valve right cavity are formed at two ends of a valve core in the direction change valve body, an inner oil path is arranged at the axial center of the valve core, and a plurality of oil grooves are arranged on the outer diameter of the valve core; the reversing valve body is provided with an oil inlet channel and an oil outlet channel which are matched with the piston working main oil way.
In the above-mentioned pusher centrifuge hydraulic system for controlling the direction change of the oil cylinder by using the stroke of the oil cylinder, preferably, the oil cylinder, the stroke reversing mechanism and the reversing valve are fixedly connected.
In the above-mentioned hydraulic system for a pusher centrifuge, which controls the reversing of the cylinder by using the stroke of the cylinder, preferably, the cylinder rotates relative to the stroke reversing mechanism and the reversing valve.
In the above-mentioned hydraulic system for a pusher centrifuge, which uses the stroke of the oil cylinder to control the reversing of the oil cylinder, preferably, the position of the stroke control sleeve in the stroke control frame is positioned by a bearing, and one end of the stroke control sleeve extending out of the stroke control frame is connected with the oil cylinder; the oil cylinder is positioned on the intermediate body through a bearing, and the reversing valve is fixed with the intermediate body.
In the above-mentioned hydraulic system for a pusher centrifuge, which controls the direction change of the cylinder by using the stroke of the cylinder, preferably, a guide rod of the piston is arranged in the cylinder.
The technical scheme takes the effective stroke action elements of the pressure oil cylinder of the pusher centrifuge as a research object, a control loop communicated with the working main oil way of the piston is designed outside the oil cylinder, the action of the control loop is combined with the action of the piston, and when the piston is positioned at two limit positions of the oil cylinder, the control loop correspondingly reacts to change the walking direction of the working main oil way of the piston. The system does not need to provide reversing power externally and is determined by the stroke point position and the dynamic process of the oil cylinder during working.
The control loop system mainly comprises two parts: firstly, the reciprocating point of the piston during working is utilized to transmit signals to the reversing valve, so that the reversing valve immediately makes the main oil way change direction. This information is done by a direct "responsible body" -the piston, to ensure timeliness of the pusher shaft reversal. Namely, one end of the material pushing shaft extends out of the oil cylinder and is designed into a stroke control shaft, the stroke control shaft and related components form a stroke reversing mechanism, and a bidirectional oil path control position is arranged in the stroke reversing mechanism: namely a negative pressure oil drainage state position and a state position which forms a communicated oil path with the reversing valve. Then the oil circuit communicated with the reversing valve cooperates with the reversing valve to change the reversing action of the main oil circuit: when the piston needs to push the material pushing shaft to work, the main oil circuit supplies oil to one side of the stroke control shaft of the piston.
Because the pressures at the two ends of the valve core in the reversing valve are equal, the scheme performs differential design on the areas of the two ends of the valve core, so that pressure difference is formed at the two ends of the valve core, and thus instant action is obtained. In the oil inlet process, if one end of the valve core is positioned at an oil drainage station, the valve core moves to the other end after oil is fed. If the other end is at the loop station, the reversing force is obtained through the area difference of the two ends of the valve core in the isobaric oil path, and the valve core moves towards one end.
Because the stroke control shaft and the valve core are both in shaft structures, the reversing condition of the material pushing shaft at two extreme positions can be completely met by utilizing the advantages of the outer diameter of the stroke control shaft and the optional length selection of the central hole.
In the system, the main operation oil path of the material pushing shaft can be connected to the reversing valve body through an intermediate arranged outside the pressure oil cylinder, so that the reversing valve forms an independent external control part. Therefore, the phenomenon that the time for switching the oil way is changed due to the change of the pressure of a hydraulic system caused by different feeding amounts, the stroke is changed and the like is avoided, and the problems of advance reversing and the like caused by the traditional reverse sleeve structure are also eliminated.
This scheme can satisfy pushing away material work of fixed hydro-cylinder and rotation type hydro-cylinder.
Compared with the prior art, the invention has the beneficial effects that: the oil cylinder is provided with a hydraulic loop, the reversing control mechanism is arranged outside the oil cylinder, dynamic information of the piston is directly transmitted to the control system, and the direction of the oil path is changed by artificially set pressure difference, so that the defects of the traditional electromagnetic valve are overcome, the problems of unequal stroke change, advanced reversing and the like caused by the reversing structure of the reversing sleeve used inside are solved, the structure is simple and reliable, the influence of system pressure is avoided, and the pushing stroke is stable.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 and 3 are schematic diagrams of two operation states according to the present invention.
Fig. 4 is a schematic structural diagram of an embodiment of a rotary cylinder according to the present invention.
Fig. 5 is a partially enlarged structural view of a portion of the stroke control frame of fig. 4.
Fig. 6 is a partially enlarged structural view of the reversing valve of fig. 4.
Fig. 7 is a partially enlarged structural schematic diagram of a material pushing shaft part of the oil cylinder of fig. 4.
Fig. 8 is a schematic view of a state structure of a commutation position of the embodiment of fig. 4.
In the figure: 1. the hydraulic cylinder comprises a piston, 2 an oil cylinder, 3 a material pushing shaft, 4 a hollow shaft, 5 a reversing valve body, 6 a valve core, 7 a right reversing oil pipe, 8 a left reversing oil pipe, 9 a stroke control frame, 10 a stroke control sleeve, 11 a stroke control shaft, 12 a sealing cover, 13 a supporting gland, 14 a stroke control right oil hole, 15 a stroke control middle oil hole, 16 a stroke control left oil hole, 17 a first oil return hole, 18 a reversing valve right cover, 19 a reversing valve left cover, 20 a reversing valve right cavity, 21 a reversing valve left cavity, 22 a reversing valve right oil return hole, 23 an oil inlet hole, 24 an inner oil way, 25 a reversing valve left oil return hole, 26 a first reversing oil way, 27 a second reversing oil way, 28 a centrifuge bearing seat, 29 a sealing bush, 30 an end cover, 31 a guide rod, 32 a cylinder cover, 33 a propelling cavity and 34 a return cavity.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
In the hydraulic system of the pusher centrifuge for controlling the reversing of the oil cylinder by using the stroke of the oil cylinder, as shown in fig. 1 to 3, in the effective stroke of a pusher shaft 3 of the pusher centrifuge, a main oil path for the operation of a piston 1 in the oil cylinder 2 is led to the outside of the oil cylinder 2 and is provided with a reversing valve, and meanwhile, the piston is used as a reference and reversely outputs the axial motion of the piston 1 to a stroke reversing mechanism along the pusher shaft 3. The reversing valve is communicated with the stroke reversing mechanism through a reversing oil path, wherein the stroke reversing mechanism is provided with an oil drainage negative pressure station and a station which forms an oil loop with the reversing valve. The reversing valve obtains reversing pressure through the area difference of two ends of the valve core 6 in the isobaric oil path. The effective stroke of the pusher shaft 3 refers to the distance between the pusher shaft 3 being fully retracted to the starting point and fully extended to the extreme position.
In the oil inlet process, when one end of the reversing valve is positioned at an oil drainage station, the valve core moves to the other end after oil is fed; when the other end of the reversing valve is positioned at a loop station, reversing force is obtained in the isobaric oil path through the area difference of two ends of the valve core, and the valve core moves towards one end of the reversing valve.
The material pushing shaft 3 is positioned in the stroke control frame 9 through the stroke control sleeve 12, the material pushing shaft 3 and the stroke control sleeve 10 move axially relatively, and the stroke control sleeve 10 and the stroke control frame 9 jointly provide an oil drainage negative pressure oil duct and an oil duct forming an oil loop with the reversing valve.
The reversing valve comprises a reversing valve body 5, a reversing valve left cavity 21 and a reversing valve right cavity 20 are respectively formed at two ends of a valve core 6 in the reversing valve body 5, a section of inner oil way 24 is arranged at the axial center of the valve core 6, and three sections of oil through grooves are arranged on the outer diameter of the valve core 6. And the reversing valve body 5 is provided with an oil inlet channel and an oil outlet channel which are matched with the working main oil circuit of the piston 1. The oil cylinder 2 is internally provided with a guide rod 31 of the piston 1.
The first embodiment is as follows: the oil cylinder 2, the stroke reversing mechanism and the reversing valve are all fixedly connected, and in order to enable the main working oil way of the piston 1 to be smoothly connected with the reversing valve body 5, the oil cylinder 2, the stroke reversing mechanism and the reversing valve are connected through an intermediate body.
Example two: the oil cylinder 2 rotates relative to the stroke reversing mechanism and the reversing valve. Referring to fig. 4, the position of the stroke control sleeve 10 in the stroke control frame 9 is positioned by a bearing, and one end of the stroke control sleeve 10 extending out of the stroke control frame 9 is connected with the oil cylinder 2; the oil cylinder 2 is positioned on a centrifuge bearing seat 28 (intermediate body) through a bearing, and the reversing valve is fixed with the centrifuge bearing seat 28.
Detailed description of the preferred embodimentsreferring to fig. 5 to 7, the piston 1 forms a left push chamber 33 and a right return chamber 34 in the cylinder 2. One end of the piston 1 opposite to the material pushing shaft 3 is connected with a stroke control shaft 11 which extends out of the oil cylinder 2. An oil feeding hole is arranged at the center of the material pushing shaft 3, two oil grooves are arranged on the outer diameter of the material pushing shaft 3, one oil groove is communicated with the pushing cavity 33 through the central oil feeding hole, and the other oil groove is communicated with the return cavity 34. The two oil grooves are respectively connected to the reversing valve body 5 outside the oil cylinder 2 through a first reversing oil path 26 and a second reversing oil path 27, and two ends of the valve core 6 are respectively communicated with the control positions of the two-way oil paths in the stroke control frame 9.
The part of the stroke control sleeve 10 positioned in the stroke control frame 9 is positioned by bearings at two ends, the outer ends of the bearings are respectively provided with a sealing cover 12 and a supporting pressing cover 13 which are fixed with the stroke control frame 9, and one end of the stroke control sleeve 10 extending out of the stroke control frame 9 is connected with the oil cylinder 2.
An oil through groove is formed in the stroke control shaft 11, three-position oil feeding holes corresponding to the oil through groove are formed in the stroke control sleeve 10, the distance between the three-position oil feeding holes is equal, the distance between two adjacent oil feeding holes corresponds to the oil through groove, the three-position oil feeding holes are a stroke control right oil hole 14, a stroke control middle oil hole 15 and a stroke control left oil hole 16 respectively, and two holes (the stroke control right oil hole 14 and the stroke control middle oil hole 15) in the three-position oil feeding holes are connected to two ends of a valve core 6 in the reversing valve body 5 through a stroke control frame 9. The stroke control frame 9 is provided with a first oil return port 17, the first oil return port 17 corresponds to the stroke control left oil hole 16, and an oil return channel in the stroke control frame 9 is communicated with a bearing part.
In the reversing valve, two matched ends of the valve core 6 and the reversing valve body 5 respectively form a reversing valve left cavity 21 and a reversing valve right cavity 20, the area of one end, facing the reversing valve right cavity 20, of the valve core 6 is larger than that of the other end, and an inner oil way 24 in the axial center of the valve core 6 leads to the reversing valve left cavity 21 from an oil inlet hole in the middle of the valve core 6. The oil inlet hole in the middle of the valve core 6 is aligned with the oil inlet hole 23 on the reversing valve body 5 when the valve core 6 is at the right end. Three oil through grooves are arranged on the outer diameter of the valve core 6, and the length of each oil through groove corresponds to the oil inlet 23, the left oil return port 25 and the right oil return port 22 on the reversing valve body 5. Meanwhile, the reversing valve body 5 is provided with oil holes corresponding to the main oil passages (the first reversing oil passage 26 and the second reversing oil passage 27) of the charging shaft 3.
The reversing valve body 5 and the stroke control frame 9 are connected through a left reversing oil pipe 8 and a right reversing oil pipe 7, a reversing valve left cover 19 and a reversing valve right cover 18 which are matched with the left reversing oil pipe 8 and the right reversing oil pipe 7 are respectively arranged at two ends of the reversing valve body 5, wherein the left reversing oil pipe 8 is connected with a reversing valve left cavity 21, and the right reversing oil pipe 7 is connected with a reversing valve right cavity 20.
The end of the oil cylinder 2 facing the stroke control frame 9 is provided with a cylinder cover 32, the stroke control shaft 11 passes through the cylinder cover 32 to the stroke control frame 9, and the end of the stroke control sleeve 10 extending out of the stroke control frame 9 is fixed on the cylinder cover 32. Two oil grooves are arranged on the outer diameter of the material pushing shaft 3, oil passages are arranged in the center of the material pushing shaft 3, one oil groove corresponds to the second reversing oil passage 27 and is communicated with the central oil passage to the pushing cavity 33 on the left side of the piston 1, and the other oil groove corresponds to the first reversing oil passage 26 and is communicated with the return cavity 34 on the right side of the piston 1.
The material pushing shaft 3 is positioned in the hollow shaft 4, the hollow shaft 4 is positioned in the centrifuge bearing seat 28 through a bearing, the hollow shaft 4 is connected with the centrifuge bearing seat 28 in a sealing way through a sealing bush 29, and the centrifuge bearing seat 28 at the outer end of the bearing is provided with an end cover 30. The hollow shaft 4, the sealing bush 29 and the centrifuge bearing seat 28 are provided with corresponding oil passages communicated with the first reversing oil passage 26 and the second reversing oil passage 27.
The operation process of the reversing shaft will be described in the following with an embodiment in which the oil cylinder 2 rotates relative to the stroke reversing mechanism and the reversing valve.
The first action is as follows: referring to fig. 4 to 7 again, the pressure oil enters the left chamber 21 of the reversing valve through the oil inlet 23 and the internal oil passage 24 inside the valve core 6, at this time, the stroke control right oil hole 14 is closed (i.e., the stroke control right oil hole 14 and the stroke control middle oil hole 15 are disconnected), and the stroke control left oil hole 16 and the stroke control middle oil hole 15 are communicated. The hydraulic oil in the right cavity 20 of the reversing valve returns to the oil tank from the first oil return port 17 through the right reversing oil pipe 7 by communicating the stroke control left oil hole 16 and the stroke control middle oil hole 15, the hydraulic oil pushes the valve core 6 to move rightwards, at the moment, the oil inlet hole 23 is communicated with the second reversing oil way 27, and the first reversing oil way 26 is communicated with the reversing valve left oil return port 25. The pressure oil enters the oil cylinder propelling cavity 33 from the oil inlet hole 23 through the second reversing oil path 27 to push the piston 1 to move rightwards, and at the moment, the hydraulic oil in the oil cylinder returning cavity 34 returns to the oil tank through the first reversing oil path 26 through the reversing valve left oil return port 25.
And the second action: referring to fig. 8, the piston 1 moves to the right, and when the stroke control right oil hole 14 and the stroke control middle oil hole 15 are communicated (the stroke control left oil hole 16 and the stroke control middle oil hole 15 are disconnected), hydraulic oil flows into the reversing valve right cavity 20 through the oil inlet hole 23 to the oil passage 24 in the valve core 6, the left reversing oil pipe 8, the stroke control right oil hole 14 and the stroke control middle oil hole 15 through the right reversing oil pipe 7. At this time, although the pressure of the hydraulic oil in the direction valve left chamber 21 and the direction valve right chamber 20 is the same, since the sectional area of the direction valve right chamber 20 is larger than that of the direction valve left chamber 21, the acting force of the direction valve right chamber 20 on the spool 6 is larger than that of the direction valve left chamber 21 on the spool 6, and the spool 6 moves leftward. At this time, the oil inlet hole 23 is communicated with the first reversing oil path 26, and the right oil return port 22 of the reversing valve is communicated with the second reversing oil path 27. The pressure oil enters the cylinder return cavity 34 from the oil inlet hole 23 through the first reversing oil path 26 to push the piston 1 to move leftwards, and at the same time, the hydraulic oil in the cylinder propulsion cavity 33 returns to the oil tank through the second reversing oil path 27 and the reversing valve right oil return opening 22.
The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple and modified processes, methods, structures, etc. of the present invention are within the scope of the present invention.

Claims (8)

1. The utility model provides an utilize hydro-cylinder stroke control hydro-cylinder switching-over to push away material centrifuge hydraulic system which characterized by: in the effective stroke of the material pushing shaft (3), a main oil path for the work of a piston (1) in an oil cylinder (2) is led to the outside of the oil cylinder, a reversing valve is arranged, and meanwhile, the piston is used as a reference to output the axial motion of the piston to a stroke reversing mechanism in the reverse direction of the material pushing shaft; the reversing valve is communicated with the stroke reversing mechanism through a reversing oil way, wherein the stroke reversing mechanism is provided with an oil drainage negative pressure station and a station which forms an oil loop with the reversing valve; the reversing valve obtains reversing pressure through the area difference of two ends of the valve core (6) in the isobaric oil path.
2. The pusher centrifuge hydraulic system for controlling cylinder reversal by cylinder stroke according to claim 1, characterized in that the pusher shaft (3) effective stroke is the distance between the pusher shaft being fully retracted to the starting point and fully extended to the extreme position.
3. The hydraulic system of the pusher centrifuge, which utilizes the stroke of the oil cylinder to control the reversing of the oil cylinder, according to the claim 1 or 2, is characterized in that the pusher shaft (3) is positioned in the stroke control frame (9) through the stroke control sleeve (10), the pusher shaft and the stroke control sleeve do relative axial movement, and the stroke control sleeve and the stroke control frame provide an oil drainage negative pressure oil passage and an oil passage forming an oil loop with the reversing valve.
4. The hydraulic system of the pusher centrifuge for controlling the oil cylinder to change direction by utilizing the oil cylinder stroke according to the claim 1 or 2, characterized in that the reversing valve comprises a reversing valve body (5), a reversing valve left cavity (21) and a reversing valve right cavity (20) are respectively formed at two ends of an inner valve core (6) of the reversing valve body, an inner oil way (24) is arranged at the axial center of the valve core, and a plurality of oil through grooves are arranged on the outer diameter of the valve core; the reversing valve body is provided with an oil inlet channel and an oil outlet channel which are matched with the working main oil circuit of the piston (1).
5. The material pushing centrifuge hydraulic system for controlling the reversing of the oil cylinder by utilizing the oil cylinder stroke as claimed in claim 1, wherein the oil cylinder (2), the stroke reversing mechanism and the reversing valve are fixedly connected.
6. The material pushing centrifuge hydraulic system for controlling the reversing of the oil cylinder by utilizing the oil cylinder stroke as claimed in claim 3, wherein the oil cylinder (2) rotates relative to the stroke reversing mechanism and the reversing valve.
7. The material-pushing centrifuge hydraulic system for controlling the reversing of the oil cylinder by utilizing the stroke of the oil cylinder as claimed in claim 6, wherein the part of the stroke control sleeve (10) positioned in the stroke control frame (9) is positioned by a bearing, and one end of the stroke control sleeve extending out of the stroke control frame is connected with the oil cylinder (2); the oil cylinder is positioned on the intermediate body through a bearing, and the reversing valve is fixed with the intermediate body.
8. The material pushing centrifuge hydraulic system for controlling the reversing of the oil cylinder by using the oil cylinder stroke as claimed in claim 1, wherein a guide rod (31) of the piston (1) is arranged in the oil cylinder (2).
CN202210469212.9A 2022-04-28 2022-04-28 Pushing centrifuge hydraulic system for controlling oil cylinder reversing by utilizing oil cylinder stroke Pending CN114857125A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210469212.9A CN114857125A (en) 2022-04-28 2022-04-28 Pushing centrifuge hydraulic system for controlling oil cylinder reversing by utilizing oil cylinder stroke

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210469212.9A CN114857125A (en) 2022-04-28 2022-04-28 Pushing centrifuge hydraulic system for controlling oil cylinder reversing by utilizing oil cylinder stroke

Publications (1)

Publication Number Publication Date
CN114857125A true CN114857125A (en) 2022-08-05

Family

ID=82635738

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210469212.9A Pending CN114857125A (en) 2022-04-28 2022-04-28 Pushing centrifuge hydraulic system for controlling oil cylinder reversing by utilizing oil cylinder stroke

Country Status (1)

Country Link
CN (1) CN114857125A (en)

Similar Documents

Publication Publication Date Title
CN107387810A (en) The machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket can be servo-actuated
CN109630504B (en) Oil inlet and outlet independent control system with pressure compensation function
CN100449158C (en) Ratio-variable feedback type digital fluid cylinder
CN109798270B (en) Multi-mode energy-saving servo actuator and method for realizing multi-mode energy saving
CN110966270A (en) Digital electro-hydrostatic actuator system
CN111503081A (en) Electric proportional control hydraulic multi-way reversing valve and control method thereof
CN114857125A (en) Pushing centrifuge hydraulic system for controlling oil cylinder reversing by utilizing oil cylinder stroke
CN108194454B (en) Oil pump and oil cylinder integrated device driven by alternating-current servo motor
CN205639129U (en) Case hollow structure's large -traffic three -way switch valve
CN201110286Y (en) Compound oil cylinder
CN217401327U (en) Hydraulic reversing mechanism of piston pusher centrifuge
CN215719923U (en) Piston buffering reversing structure of hydraulic drive type compressor
CN116989025A (en) Hydraulic propeller
CN202646665U (en) Control system for hydraulic coupler
CN114542539A (en) Reversing valve of rock drill
CN111608967B (en) Hydraulic pressing control system for spinning machine die
CN100547250C (en) Differential valve
CN210461782U (en) Large-flow electro-hydraulic proportional reversing and exciting dual-purpose valve
CN101140002B (en) Compound oil cylinder
CN200989344Y (en) Digital fluid cylinder with built-in variable speed mechanism
CN112303059B (en) Gas-liquid composite driving type speed increasing cylinder device
CN117552922B (en) Energy-saving hydraulic cycloid motor
CN108425911B (en) A kind of cylinder moving type composite hydraulic cylinder
CN112984123B (en) Valve core driving conversion structure of servo valve
CN216518904U (en) Continuous flow amplifier and hydraulic press

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination