CN112901589A - Main oil cylinder of hydraulic machine - Google Patents

Main oil cylinder of hydraulic machine Download PDF

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Publication number
CN112901589A
CN112901589A CN202110115408.3A CN202110115408A CN112901589A CN 112901589 A CN112901589 A CN 112901589A CN 202110115408 A CN202110115408 A CN 202110115408A CN 112901589 A CN112901589 A CN 112901589A
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CN
China
Prior art keywords
oil
groove
sliding
rod
piston
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Granted
Application number
CN202110115408.3A
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Chinese (zh)
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CN112901589B (en
Inventor
张燕
孙龙
王洛
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Dingxiang Haodong Machinery Manufacturing Co ltd
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Individual
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Publication of CN112901589A publication Critical patent/CN112901589A/en
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Publication of CN112901589B publication Critical patent/CN112901589B/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423Component parts; Constructional details
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/027Check valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423Component parts; Constructional details
    • F15B15/1433End caps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423Component parts; Constructional details
    • F15B15/1438Cylinder to end cap assemblies
    • F15B15/1442End cap sealings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423Component parts; Constructional details
    • F15B15/1447Pistons; Piston to piston rod assemblies
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423Component parts; Constructional details
    • F15B15/1447Pistons; Piston to piston rod assemblies
    • F15B15/1452Piston sealings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423Component parts; Constructional details
    • F15B15/1457Piston rods
    • F15B15/1461Piston rod sealings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/149Fluid interconnections, e.g. fluid connectors, passages
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20Other details, e.g. assembly with regulating devices
    • F15B15/202Externally-operated valves mounted in or on the actuator
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04Special measures taken in connection with the properties of the fluid
    • F15B21/041Removal or measurement of solid or liquid contamination, e.g. filtering

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  • 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 belongs to the technical field of hydraulic press oil cylinders, and particularly relates to a main oil cylinder of a hydraulic press, which comprises a cylinder barrel, a moving unit and a sealing unit; the motion unit comprises a piston and a piston rod; a first sliding groove is formed in the cylinder barrel; the first sliding chute is internally connected with a piston in a sealing and sliding manner; therefore, the sealing performance of a sealing ring in the main oil cylinder of the hydraulic machine is enhanced, the oil leakage phenomenon of the main oil cylinder of the hydraulic machine is prevented, and the service efficiency of the hydraulic machine is improved; therefore, when the sealing strand is replaced, the replacement efficiency is improved, the damage to the sealing ring is reduced, the service life of the sealing ring is prolonged, the phenomenon of oil leakage in the main oil cylinder of the hydraulic machine is avoided, and the use efficiency of the hydraulic machine is improved; the hydraulic oil is filtered, so that the pressure reduction effect of the hydraulic oil is improved, and the sealing performance of the sealing ring on the main oil cylinder is improved; the inner wall of the main oil cylinder of the hydraulic machine is cleaned, the damage of the sealing ring is reduced, the service life of the sealing ring is prolonged, the main oil cylinder of the hydraulic machine is subjected to gas exhaust, and the use sensitivity of the hydraulic machine is improved.

Description

Main oil cylinder of hydraulic machine
Technical Field
The invention belongs to the technical field of hydraulic press oil cylinders, and particularly relates to a main oil cylinder of a hydraulic press.
Background
A hydraulic machine (also known as oil press) is a machine for processing products such as metal, plastic, rubber, wood, powder and the like by utilizing hydrostatic pressure. It is commonly used in pressing and press forming processes, such as forging, stamping, cold extrusion, straightening, bending, flanging, sheet drawing, powder metallurgy, press fitting, etc.; the principle of the hydraulic transmission mechanism is that the hydraulic transmission mechanism is made by using the Pascal law and has a plurality of types. Of course, the use is also quite extensive; and is varied as needed. For example, the pressure-transmitting liquid is classified into two categories, namely an oil press and a water press; the hydraulic press generates a large total pressure and is commonly used for forging and stamping. The forging hydraulic press is divided into a die forging hydraulic press and a free forging hydraulic press. The die forging hydraulic press uses a die, while the free forging hydraulic press does not use a die. The first ten thousand ton hydraulic press manufactured in China is a free forging hydraulic press.
The oil leakage phenomenon often appears when the hydraulic press hydro-cylinder that uses at present in the prior art makes use, makes the hydraulic press use and appears reacting slowly or even stop work, and it is low to changing the efficiency to the hydraulic press master cylinder inner seal circle, and the length causes the damage to the sealing washer, makes the sealing washer wearing and tearing seriously appear oil leakage phenomenon in the hydraulic press use, and the hydraulic press master cylinder internal storage has gas when using the hydraulic press for the first time, appears dull phenomenon when using the hydraulic press.
Disclosure of Invention
The invention provides a main oil cylinder of a hydraulic machine, aiming at overcoming the defects of the prior art and solving the problems that the use of the hydraulic machine is slow due to oil leakage of the main oil cylinder of the hydraulic machine, the sealing ring is damaged when the sealing ring is replaced due to low efficiency, the sealing ring is seriously abraded due to the use of the hydraulic machine, and gas is stored in the main oil cylinder when the hydraulic machine is used for the first time.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a main oil cylinder of a hydraulic machine, which comprises a cylinder barrel, a moving unit and a sealing unit; the motion unit comprises a piston and a piston rod; a first sliding groove is formed in the cylinder barrel; the first sliding chute is internally connected with a piston in a sealing and sliding manner; a second sliding groove is formed in the piston; the second sliding groove is communicated with the side wall of the piston; two ends of the second sliding chute are respectively connected with a first sliding rod in a sealing sliding manner; two first oil holes which are uniformly distributed are formed below the second sliding groove of the piston; each first oil hole is communicated with the second sliding groove and the first sliding groove in a space below the piston; the surface of the piston is provided with three first sealing grooves which are uniformly distributed; a first O-shaped sealing ring is hermetically connected in the first sealing groove in the middle; the upper and lower first sealing grooves are internally and hermetically connected with a first Y-shaped sealing ring; the lower end of the cylinder barrel is provided with a first liquid inlet; the sealing unit comprises a cylinder cover and a plunger rod; the bottom end of the cylinder barrel is in threaded connection with the cylinder cover through the surface of the bottom end of the cylinder barrel and a thread groove formed in the cylinder cover; the first liquid inlet is positioned above the cylinder cover; a second sealing groove is formed in the cylinder cover at the bottom end of the inner thread groove of the cylinder cover; the second sealing groove is connected with a second O-shaped sealing ring in a sealing manner; a plunger rod is hermetically connected in a first sliding groove in the top of the cylinder barrel; two third sealing grooves are formed in the surface of the plunger rod; a second Y-shaped sealing ring is hermetically connected in the third sealing groove at the bottom end; a third O-shaped sealing ring is hermetically connected in the third sealing groove at the upper end; a third sliding groove is formed in the plunger rod; the third sliding groove is communicated with the first sliding groove and the outside; the piston rod slides in the third sliding groove in a sealing manner and extends out of the third sliding groove; the cylinder barrel is provided with a second liquid inlet below the plunger rod;
when the hydraulic oil pump works, hydraulic oil enters the first chute from the first liquid inlet, so that the pressure intensity of the first chute in a space below the piston is increased, the threaded connection part of the cylinder barrel and the cylinder cover is in sealing connection with the second O-shaped sealing ring, so that the hydraulic oil is prevented from entering the first chute and leaking out through the connection part of the cylinder cover and the cylinder barrel, the sealing property of the cylinder barrel is enhanced, the pressure intensity of the first chute in the space below the piston is increased along with the continuous entry of the hydraulic oil into the first chute through the first liquid inlet, so that the piston is pushed to move upwards, and the piston rod is driven to move upwards, because the upper end and the lower end of the peripheral ring of the piston are in sealing connection with the first Y-shaped sealing rings, when the hydraulic oil enters the first chute and pushes the piston to move upwards, the Y opening of the first Y-shaped sealing ring at the lower end is downward, so that the sealing property between the piston and the first chute is enhanced, thereby reducing the sensitivity of the up-and-down movement of the piston, and the hydraulic oil passes through the first oil hole; the hydraulic oil enters the second chute, so that the pressure in the second chute is increased, the two first sliding rods move towards the opposite side, the two first sliding rods extrude the first O-shaped sealing ring, the first O-shaped sealing ring is further attached to the inner wall of the first chute, the hydraulic oil in the space below the piston of the first chute is prevented from entering the space above the piston of the first chute, the use sensitivity of the piston is enhanced, and the piston rod moves upwards and slides in the third chute; the surface of the plunger rod is connected with the second Y-shaped sealing ring and the third O-shaped sealing ring in a sealing mode, so that hydraulic oil in the space above the piston of the first sliding groove is prevented from entering the outside and leaking oil, the use flexibility of the hydraulic machine is reduced, the hydraulic oil is wasted, the hydraulic cost is increased, and the sealing type of the plunger rod is enhanced due to the fact that the plunger rod is connected with the two sealing rings in a sealing mode.
Preferably, air cavities which are uniformly distributed are formed in the first O-shaped sealing ring, the second O-shaped sealing ring and the third O-shaped sealing ring; the air cavity is close to the inner side direction;
when the sealing ring device works, a first O-shaped sealing ring, a second O-shaped sealing ring and a third O-shaped sealing ring are respectively arranged in corresponding sealing grooves of a brand new hydraulic machine, or the first O-shaped sealing ring, the second O-shaped sealing ring and the third O-shaped sealing ring are replaced, the size of the sealing rings and the size of the sealing grooves are correspondingly designed, so that the sealing rings are not easy to be arranged when the sealing rings are arranged, the sealing rings are damaged by using strong force, the service life of the sealing rings is shortened, and the service efficiency of the hydraulic machine is influenced, because air cavities are arranged in the first O-shaped sealing ring, the second O-shaped sealing ring and the third O-shaped sealing ring, when the first O-shaped sealing ring, the second O-shaped sealing ring and the third O-shaped sealing ring are arranged, the inner sides of the first O-shaped sealing ring, the second O-shaped sealing ring and the third O-shaped sealing ring are, thereby the internal diameter of increase sealing washer, thereby make first O type sealing washer, second O type sealing washer and third O type sealing washer pack into in the corresponding seal groove more easily, thereby less harm to the sealing washer, because first O type sealing washer of first slide bar extrusion, produce wearing and tearing when first O type sealing washer and first spout inner wall contact department, thereby reduce the outside radius size of first O type sealing washer, first O type sealing washer of first slide bar extrusion, thereby make the air cavity take place to warp, thereby make first O type sealing washer hug closely with first spout inner wall to taking place to warp, thereby make first O type sealing washer and first spout inner wall form sealedly, thereby the life of first O type sealing washer has been increased.
Preferably, each first oil hole is fixedly connected with a pressure control valve; each pressure control valve is provided with a second oil hole in the direction close to the lower surface of the piston; a first oil groove is formed in the upper end of each second oil hole in the pressure control valve; each pressure control valve is provided with a second oil groove in the direction close to the piston rod; the second oil groove is communicated with the first oil groove, and the inner diameter of the second oil groove is smaller than that of the first oil groove; a first oil rod is arranged in the first oil groove; the first oil rod penetrates into the second oil groove; the diameter of a first oil rod in the first oil groove is larger than that of a first oil rod in a second first oil rod; the first oil rod and the first oil groove are tightly attached to each other in an initial state close to the inner wall of the second oil groove; one end of the first oil rod, which is far away from the second oil groove, is fixedly connected with a baffle; the baffle and the inner wall of the first oil groove far away from the second oil groove are not tightly attached; the baffle is connected with the inner wall of the first oil groove in the direction close to the first oil groove through a first spring; the pressure control valve is provided with a third oil groove in the direction far away from the second oil groove; the third oil groove is communicated with the first oil groove through a sliding hole formed in the pressure control valve; the first oil rod penetrates into the third oil groove through the sliding hole; the first oil rod in the third oil groove is in a horn-shaped design; the third oil tank is communicated with the first oil tank through a fourth oil tank arranged in the pressure control valve; a second oil rod is arranged in the third oil groove; the second oil rod is fixedly connected with two sliding blocks which are designed corresponding to the first oil rod; the two sliding blocks are connected through a second spring; the two sliding blocks are in contact with the first oil rod in the initial state, and the sliding blocks are in an extrusion state on the first oil rod in the initial state; a fourth sliding groove is formed in the bottom end of the second oil rod in the second oil rod; a second sliding rod is connected in the fourth sliding groove in a sliding manner; the bottom of the second sliding rod is fixedly connected with the inner wall of the third oil groove; the bottom of the second sliding rod is connected with the inner wall of the bottom of the third oil groove through a third spring; a fifth oil groove is formed in the upper end of the second oil groove in the pressure control valve; the fifth oil groove is communicated with the second sliding chute and the second oil groove;
when in work, hydraulic oil enters the first sliding chute and then enters the first oil groove through the second oil hole, the inner diameter of the second oil hole is small, so that the pressure of hydraulic oil entering the first oil groove is reduced, the hydraulic oil enters the first oil groove and enters the third oil groove through the fourth oil groove, thereby further reducing the hydraulic pressure of the hydraulic oil, so that the hydraulic oil extrudes the second slide rod to move the second slide rod downwards, thereby the third spring is compressed downwards, and simultaneously the second oil rod drives the slide block to move downwards, thereby the first oil rod is separated from the extrusion state, thereby releasing the extrusion state of the first spring and extending the first spring, thereby pushing the baffle to move towards the third oil groove, the first oil rod is driven to move towards the third oil groove, so that the first oil rod and the first oil groove are close to the inner wall of the second oil groove and are not attached tightly, hydraulic oil enters the second oil groove and enters the second sliding groove through the fifth oil groove; the first sliding rod is pushed to slide, so that hydraulic pressure of hydraulic oil entering the second sliding groove is reduced, damage to the first O-shaped sealing ring caused by pushing of the first sliding rod due to overlarge pressure in the second sliding groove is avoided, and the sealing effect of the first O-shaped sealing ring is reduced; thereby the life of first O type sealing washer has been improved.
Preferably, each second oil hole is fixedly connected with a first block; each first block is provided with a fifth sliding chute; each fifth sliding groove is communicated with the upper surface and the lower surface of the first block; a third sliding rod is connected in each fifth sliding groove in a sliding manner; each third sliding rod is fixedly connected with a second block above the first block; the first block and the second block are tightly attached in an initial state; the second oil hole is fixedly connected with a third block above the second block; the third block is provided with a sixth sliding chute; the third sliding rod penetrates into the sixth sliding groove; the third block and the second block are connected through a fourth spring; the fourth spring is wound on the third slide bar; the third block is provided with uniformly distributed filter holes; each filtering hole is communicated with the upper surface and the lower surface of the third block;
when the sealing device works, when hydraulic oil enters the second oil hole, the pressure intensity of the second oil hole in a space below the first block is increased along with the entering of the hydraulic oil, so that the third sliding rod moves upwards, the fourth spring is driven to contract, the hydraulic oil enters a space formed by the first block and the third block through the fifth sliding groove, the hydraulic oil enters a space above the third block through the filter hole, the filter hole filters the hydraulic oil, impurities in the hydraulic oil are filtered between the first block and the third block, the impurities contained in the hydraulic oil are prevented from entering the first oil groove, the first oil groove is blocked, the hydraulic oil cannot be depressurized, the sealing performance of the first O-shaped sealing ring is reduced, when the hydraulic oil stops feeding into the second oil hole, the fourth spring extends, the second block is pushed to move downwards, and the second block and the first block are attached again, thereby make hydraulic oil can not get into first spout from the second oilhole to make first O type sealing washer continuously receive first slide bar extrusion, thereby strengthen first O type sealing washer's leakproofness.
Preferably, the upper surface and the lower surface of each piston are fixedly connected with a convex block; the cross section of each convex block is designed into a right-angled triangle, and the bevel edge of the right-angled triangle is designed into an arc shape; one side of the convex block is tightly attached to the inner wall of the first sliding chute;
the during operation reciprocates as the piston, thereby it removes to drive protruding piece, thereby make protruding piece to first spout inner wall attached to impurity in the hydraulic oil and first spout clear away because of the arch of making the time surface, thereby it is smooth to make first spout inner wall, thereby avoid first O type sealing ring and first Y type sealing ring to receive the arch of first spout inner wall and attached to the impurity harm in the hydraulic oil, thereby the leakproofness of first O type sealing ring and first Y type sealing ring has been improved, thereby the life of first O type sealing ring and first Y type sealing ring has been increased.
Preferably, a first air groove is formed in each of the convex block and the piston; a one-way valve is arranged in the first air groove in each protruding block; a second air groove is not formed in the piston rod; the second air groove is communicated with the first air groove and the top surface of the piston rod; a hollow ball is arranged at the joint of the first air groove and the second air groove; the inner diameter of the hollow ball is larger than that of the second gas groove; the hollow ball is connected to the inner wall of the second air groove through an elastic pull rope;
when the hydraulic press works for the first time, hydraulic oil enters the first sliding chute through the first oil inlet hole, so that gas in the space below the piston of the first sliding chute enters the first gas groove and enters the outside through the second gas groove, the gas in the first gas groove is discharged outside, and the use sensitivity of the hydraulic press is enhanced; because be equipped with the check valve in the first air pocket to prevent that external gas from getting into first spout, hydraulic oil gets into first air pocket in first spout, makes the air ball come-up under the effect of buoyancy, thereby makes clean shot and second air pocket bottom inner wall in close contact with, thereby hydraulic oil can not get into the external world through the second air pocket in the first air pocket, thereby avoids hydraulic oil to leak outward, thereby improves the service sensitivity of hydraulic press.
The invention has the following beneficial effects:
1. the main oil cylinder of the hydraulic machine is provided with a first O-shaped sealing ring, a second O-shaped sealing ring, a third O-shaped sealing ring and a cylinder barrel; the threaded connection part of the cylinder barrel and the cylinder cover is hermetically connected with the second O-shaped sealing ring, so that hydraulic oil is prevented from entering the first sliding groove and leaking out through the connection part of the cylinder cover and the cylinder barrel, and the sealing performance of the cylinder barrel is enhanced; hydraulic oil passes through the first oil hole; the hydraulic oil enters the second chute, so that the pressure in the second chute is increased, the two first sliding rods move towards the opposite side, the two first sliding rods extrude the first O-shaped sealing ring, the first O-shaped sealing ring is further attached to the inner wall of the first chute, the hydraulic oil in the space below the piston of the first chute is prevented from entering the space above the piston of the first chute, the use sensitivity of the piston is enhanced, and the piston rod moves upwards and slides in the third chute; the surface of the plunger rod is connected with the second Y-shaped sealing ring and the third O-shaped sealing ring in a sealing mode, so that hydraulic oil in the space above the piston of the first sliding groove is prevented from entering the outside and leaking oil, the use flexibility of the hydraulic machine is reduced, the hydraulic oil is wasted, the hydraulic cost is increased, and the sealing type of the plunger rod is enhanced due to the fact that the plunger rod is connected with the two sealing rings in a sealing mode.
2. The main oil cylinder of the hydraulic machine is provided with the first block, the second block and the third block; when the hydraulic oil enters the space formed by the first block and the third block through the fifth chute, the hydraulic oil enters the space above the third block through the filter hole and the second oil hole, thereby the filter holes filter the hydraulic oil, impurities in the hydraulic oil are filtered between the first block and the third block, thereby avoiding impurities contained in the hydraulic oil from entering the first oil groove to cause the first oil groove to be blocked, thereby the pressure of the hydraulic oil can not be reduced, the sealing performance of the first O-shaped sealing ring is reduced, when the hydraulic oil stops feeding oil into the second oil hole, thereby the fourth spring is expanded to push the second block to move downwards, the second block is jointed with the first block again, thereby make hydraulic oil can not get into first spout from the second oilhole to make first O type sealing washer continuously receive first slide bar extrusion, thereby strengthen first O type sealing washer's leakproofness.
3. The main oil cylinder of the hydraulic machine is provided with the convex block, the first air groove and the second air groove; when the hydraulic press is used for the first time, hydraulic oil enters the first sliding chute through the first oil inlet hole, so that gas in the space below the piston of the first sliding chute enters the first gas groove, and then enters the outside through the second gas groove, so that the gas in the first gas groove is discharged to the outside, and the use sensitivity of the hydraulic press is enhanced; because be equipped with the check valve in the first air pocket to prevent that external gas from getting into first spout, hydraulic oil gets into first air pocket in first spout, makes the air ball come-up under the effect of buoyancy, thereby makes clean shot and second air pocket bottom inner wall in close contact with, thereby hydraulic oil can not get into the external world through the second air pocket in the first air pocket, thereby avoids hydraulic oil to leak outward, thereby improves the service sensitivity of hydraulic press.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a front view of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is an enlarged view of a portion of FIG. 1 at B;
FIG. 4 is an enlarged view of a portion of FIG. 1 at C;
FIG. 5 is an enlarged view of a portion of FIG. 1 at D;
FIG. 6 is an enlarged view of a portion E of FIG. 1;
FIG. 7 is an enlarged view of a portion of FIG. 3 at F;
FIG. 8 is an enlarged view of a portion of FIG. 3 at G;
in the figure: the piston comprises a cylinder barrel 1, a first slide groove 10, a first liquid inlet 11, a second liquid inlet 12, a piston 2, a second slide groove 20, a first slide rod 21, a first oil hole 22, a first seal groove 23, a first O-shaped seal ring 24, an air cavity 240, a first Y-shaped seal ring 25, a piston rod 3, a cylinder head 4, a second seal groove 40, a second O-shaped seal ring 41, a piston rod 5, a third seal groove 50, a second Y-shaped seal ring 51, a third O-shaped seal ring 52, a pressure control valve 6, a second oil hole 60, a first oil groove 61, a second oil groove 62, a first oil rod 620, a baffle 621, a first spring 622, a third oil groove 63, a slide hole 630, a fourth oil groove 64, a second oil rod 640, a slide block 641, a second spring 642, a fourth slide groove 643, a second slide rod 644, a third spring 645, a fifth oil groove 65, a first block 7, a fifth slide groove 70, a third slide rod 71, a second block 72, a third block 73, a sixth block 74, a sixth slide groove 74, A fourth spring 75, a filter hole 76, a convex block 8, a first air groove 80, a one-way valve 81, a second air groove 82, a hollow ball 83 and an elastic pull rope 84.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 8, the master cylinder of the hydraulic machine of the present invention comprises a cylinder barrel 1, a moving unit, and a sealing unit; the motion unit comprises a piston 2 and a piston rod 3; a first sliding groove 10 is formed in the cylinder barrel 1; the first chute 10 is internally connected with a piston 2 in a sealing and sliding manner; a second chute 20 is formed in the piston 2; the second chute 20 is communicated with the side wall of the piston 2; two ends of the second chute 20 are respectively connected with a first sliding rod 21 in a sealing sliding manner; two first oil holes 22 are uniformly distributed below the second sliding chute 20 of the piston 2; each of the first oil holes 22 communicates the second slide groove 20 and the first slide groove 10 in a space below the piston 2; three first sealing grooves 23 which are uniformly distributed are formed in the surface of the piston 2; a first O-shaped sealing ring 24 is hermetically connected in the middle of the first sealing groove 23; a first Y-shaped sealing ring 25 is hermetically connected in the upper and lower first sealing grooves 23; the lower end of the cylinder barrel 1 is provided with a first liquid inlet 11; the sealing unit comprises a cylinder cover 4 and a plunger rod 5; the bottom end of the cylinder barrel 1 is in threaded connection with the cylinder cover 4 through a thread groove formed in the surface of the bottom end of the cylinder barrel 1 and the cylinder cover 4; the first liquid inlet 11 is positioned above the cylinder cover 4; a second sealing groove 40 is formed in the cylinder cover 4 at the bottom end of the internal thread groove of the cylinder cover 4; the second sealing groove 40 is connected with a second O-shaped sealing ring 41 in a sealing manner; a connecting column plug rod 5 is hermetically connected in a first sliding groove 10 at the top of the cylinder barrel 1; two third sealing grooves 50 are formed in the surface of the plunger rod 5; a second Y-shaped sealing ring 51 is hermetically connected in the third sealing groove 50 at the bottom end; a third O-shaped sealing ring 52 is hermetically connected in the third sealing groove 50 at the upper end; a third sliding groove is formed in the plunger rod 5; the third chute is communicated with the first chute 10 and the outside; the piston rod 3 slides in the third sliding groove in a sealing manner, and the piston rod 3 extends out of the third sliding groove; a second liquid inlet 12 is formed in the cylinder barrel 1 below the plunger rod 5;
when the hydraulic oil hydraulic cylinder works, hydraulic oil enters the first chute 10 from the first liquid inlet 11, so that the pressure intensity of the first chute 10 in a space below the piston 2 is increased, the second O-shaped sealing ring 41 is hermetically connected at the threaded connection part of the cylinder barrel 1 and the cylinder cover 4, so that the hydraulic oil is prevented from entering the first chute 10 and leaking out from the connection part of the cylinder cover 4 and the cylinder barrel 1, so that the sealing property of the cylinder barrel 1 is enhanced, the hydraulic oil continuously enters the first chute 10 through the first liquid inlet 11, so that the pressure intensity of the first chute 10 in the space below the piston 2 is increased, the piston 2 is pushed to move upwards, so that the piston rod 3 is driven to move upwards, the first Y-shaped sealing rings 25 are hermetically connected at the upper end and the lower end of the circumference of the piston 2, so that when the hydraulic oil enters the first chute 10 and pushes the piston 2 to move upwards, the Y-shaped opening of the first Y-shaped sealing ring 25 at, thereby preventing the hydraulic oil in the space below the piston 2 of the first sliding chute 10 from entering the space above the piston 2 of the first sliding chute 10, and reducing the sensitivity of the piston 2 to move up and down, the hydraulic oil passing through the first oil hole 22; the hydraulic oil enters the second chute 20, so that the pressure in the second chute 20 is increased, the two first sliding rods 21 move towards the opposite side, the two first sliding rods 21 extrude the first O-shaped sealing ring 24, the first O-shaped sealing ring 24 is further attached to the inner wall of the first chute 10, the hydraulic oil in the space below the piston 2 of the first chute 10 is prevented from entering the space above the piston 2 of the first chute 10, the use sensitivity of the piston 2 is enhanced, and the piston rod 3 moves upwards and slides in the third chute; the surface of the plunger rod 5 is connected with the second Y-shaped sealing ring 51 and the third O-shaped sealing ring 52 in a sealing mode, so that hydraulic oil in the space above the piston 2 of the first chute 10 is prevented from entering the outside, an oil leakage phenomenon is generated, the use flexibility of the hydraulic machine is reduced, the hydraulic oil is wasted, the hydraulic cost is increased, and the sealing type of the plunger rod 5 is enhanced because the plunger rod 5 is connected with the two sealing rings in a sealing mode.
As an embodiment of the present invention, the first O-ring 24, the second O-ring 41 and the third O-ring 52 are all provided with air cavities 240 uniformly distributed therein; the air cavity 240 is close to the inner side direction;
when the sealing ring device works, when a brand new hydraulic machine is respectively provided with the first O-shaped sealing ring 24, the second O-shaped sealing ring 41 and the third O-shaped sealing ring 52 in the corresponding sealing grooves, or the first O-shaped sealing ring 24, the second O-shaped sealing ring 41 and the third O-shaped sealing ring 52 are replaced, the sizes of the sealing rings and the sizes of the sealing grooves are correspondingly designed, so that the sealing rings are not easy to be arranged when the sealing rings are arranged, the sealing rings are damaged by using strong force, the service life of the sealing rings is shortened, and the service efficiency of the hydraulic machine is influenced, because the air cavities 240 are arranged in the first O-shaped sealing ring 24, the second O-shaped sealing ring 41 and the third O-shaped sealing ring 52, when the first O-shaped sealing ring 24, the second O-shaped sealing ring 41 and the third O-shaped sealing ring 52 are arranged, the inner sides of the first O-shaped sealing ring 24, the second O-shaped sealing ring 41 and, therefore, the air cavity 240 is deformed, the inner diameter of the sealing ring is increased, the first O-ring 24, the second O-ring 41 and the third O-ring 52 are more easily arranged in the corresponding sealing grooves, damage to the sealing rings is reduced, the first sliding rod 21 extrudes the first O-ring 24, when the contact part of the first O-ring 24 and the inner wall of the first sliding chute 10 is abraded, the outer radius of the first O-ring 24 is reduced, the first sliding rod 21 extrudes the first O-ring 24, the air cavity 240 is deformed, the first O-ring 24 deforms to be closely attached to the inner wall of the first sliding chute 10, the first O-ring 24 and the inner wall of the first sliding chute 10 are sealed, and the service life of the first O-ring 24 is prolonged.
As an embodiment of the present invention, a pressure control valve 6 is fixedly connected in each of the first oil holes 22; each pressure control valve 6 is provided with a second oil hole 60 in the direction close to the lower surface of the piston 2; a first oil groove 61 is formed in the pressure control valve 6 at the upper end of each second oil hole 60; each pressure control valve 6 is provided with a second oil groove 62 in the direction close to the piston rod 3; the second oil groove 62 is communicated with the first oil groove 61, and the inner diameter of the second oil groove 62 is smaller than that of the first oil groove 61; a first oil rod 620 is arranged in the first oil groove 61; the first oil rod 620 penetrates into the second oil groove 62; the diameter of the first oil rod 620 in the first oil groove 61 is larger than that of the first oil rod 620 in the second first oil rod 620; the first oil rod 620 and the first oil groove 61 are tightly attached to each other in an initial state close to the inner wall of the second oil groove 62; a baffle 621 is fixedly connected to one end of the first oil rod 620 far away from the second oil groove 62; the baffle 621 and the inner wall of the first oil groove 61 far away from the second oil groove 62 are not closely attached; the baffle 621 is connected with the inner wall of the first oil groove 61 close to the first oil groove 61 through a first spring 622; the pressure control valve 6 is provided with a third oil groove 63 in the direction away from the second oil groove 62; the third oil groove 63 is communicated with the first oil groove 61 through a sliding hole 630 formed in the pressure control valve 6; the first oil rod 620 penetrates into the third oil groove 63 through the slide hole 630; the first oil rod 620 in the third oil groove 63 is in a horn-shaped design; the third oil groove 63 is communicated with the first oil groove 61 through a fourth oil groove 64 formed in the pressure control valve 6; a second oil rod 640 is arranged in the third oil groove 63; the second oil rod 640 is fixedly connected with two sliding blocks 641 which are designed corresponding to the first oil rod 620; the two sliding blocks 641 are connected through a second spring 642; two of the sliders 641 are initially in contact with the first oil rod 620, and the sliders 641 are initially pressed against the first oil rod 620; a fourth chute 643 is formed in the bottom end of the second oil rod 640 and located in the second oil rod 640; a second sliding rod 644 is slidably connected in the fourth sliding groove 643; the bottom of the second sliding rod 644 is fixedly connected with the inner wall of the third oil groove 63; the bottom of the second sliding rod 644 is connected with the inner wall of the bottom of the third oil groove 63 through a third spring 645; a fifth oil groove 65 is formed in the pressure control valve 6 at the upper end of the second oil groove 62; the fifth oil groove 65 communicates the second chute 20 and the second oil groove 62;
in operation, when hydraulic oil enters the first sliding groove 10, and thus enters the first oil groove 61 through the second oil hole 60, because the inner diameter of the second oil hole 60 is small, pressure of the hydraulic oil entering the first oil groove 61 is reduced, the hydraulic oil enters the first oil groove 61 and enters the third oil groove 63 through the fourth oil groove 64, so that the hydraulic pressure of the hydraulic oil is further reduced, and thus the hydraulic oil extrudes the second sliding rod 644, so that the second sliding rod 644 moves downward, so that the third spring 645 compresses downward, and at the same time, the second oil rod 640 drives the sliding block 641 to move downward, so that the first oil rod 620 is separated from the extrusion state, so that the first spring 622 removes the extrusion state and extends, so as to push the baffle 621 to move toward the third oil groove 63, so as to drive the first oil rod 620 to move toward the third oil groove 63, so that the first oil rod 620 and the first oil groove 61 are close to the inner wall of the second oil groove 62 to, thereby allowing the hydraulic oil to enter the second oil groove 62, and thus to enter the second sliding groove 20 through the fifth oil groove 65; thereby pushing the first slide rod 21 to slide, so that the hydraulic pressure of the hydraulic oil entering the second chute 20 is reduced, thereby preventing the first slide rod 21 from being pushed by overlarge pressure in the second chute 20 to damage the first O-shaped sealing ring 24, and further reducing the sealing effect of the first O-shaped sealing ring 24; thereby increasing the service life of the first O-ring seal 24.
As an embodiment of the present invention, a first block 7 is fixedly connected in each of the second oil holes 60; each first block 7 is provided with a fifth chute 70; each fifth sliding groove 70 is communicated with the upper surface and the lower surface of the first block 7; a third sliding rod 71 is connected in each fifth sliding groove 70 in a sliding manner; each third sliding rod 71 is fixedly connected with a second block 72 above the first block 7; the first block 7 and the second block 72 are tightly attached in an initial state; the second oil hole 60 is fixedly connected with a third block 73 above the second block 72; the third block 73 is provided with a sixth sliding chute 74; the third sliding bar 71 penetrates into the sixth sliding groove 74; the third block 73 is connected with the second block 72 through a fourth spring 75; the fourth spring 75 is wound around the third slide bar 71; the third block 73 is provided with uniformly distributed filter holes 76; each filter hole 76 is communicated with the upper surface and the lower surface of the third block 73;
during operation, when hydraulic oil enters the second oil hole 60, the pressure of the second oil hole 60 in the space below the first block 7 is increased along with the entering of the hydraulic oil, so that the third sliding rod 71 moves upwards to drive the fourth spring 75 to contract, the hydraulic oil enters the space formed by the first block 7 and the third block 73 through the fifth sliding groove 70, and enters the space above the third block 73 through the second oil hole 60 through the filtering hole 76, so that the filtering hole 76 filters the hydraulic oil, impurities in the hydraulic oil are filtered between the first block 7 and the third block 73, the impurities in the hydraulic oil are prevented from entering the first oil groove 61, the first oil groove 61 is blocked, the pressure of the hydraulic oil cannot be reduced, the sealing performance of the first O-shaped sealing ring 24 is reduced, when the hydraulic oil stops entering the second oil hole 60, the fourth spring 75 is extended, thereby, the second block 72 is pushed to move downwards, the second block 72 is attached to the first block 7 again, and hydraulic oil cannot enter the first sliding groove 10 from the second oil hole 60, so that the first O-shaped sealing ring 24 is continuously extruded by the first sliding rod 21, and the sealing performance of the first O-shaped sealing ring 24 is enhanced.
As an embodiment of the invention, the upper and lower surfaces of each piston 2 are fixedly connected with a convex block 8; the section of each convex block 8 is designed into a right triangle, and the bevel edge of the right triangle is designed into an arc shape; one side of the convex block 8 is tightly attached to the inner wall of the first sliding groove 10;
the during operation reciprocates as piston 2, thereby drive protruding piece 8 and remove, thereby make protruding piece 8 to 10 inner walls of first spout impurity in the attached hydraulic oil and first spout 10 clear away because of the arch of making the surface, thereby make 10 inner walls of first spout smooth, thereby avoid first O type sealing ring and first Y type sealing ring to receive the arch of 10 inner walls of first spout and the impurity harm in the attached hydraulic oil, thereby the leakproofness of first O type sealing ring and first Y type sealing ring has been improved, thereby the life of first O type sealing ring and first Y type sealing ring has been increased.
As an embodiment of the present invention, each of the protruding block 8 and the piston 2 has a first air groove 80 formed therein; a one-way valve 81 is arranged in a first air groove 80 in each convex block 8; a second air groove 82 is not formed in the piston rod 3; the second air groove 82 is communicated with the first air groove 80 and the top surface of the piston rod 3; a hollow ball 83 is arranged at the joint of the first air groove 80 and the second air groove 82; the inner diameter of the hollow ball 83 is larger than that of the second gas groove 82; the hollow ball 83 is connected to the inner wall of the second air groove 82 through an elastic pull rope 84;
when the hydraulic press works for the first time, hydraulic oil enters the first sliding chute 10 through the first oil inlet hole, so that gas in the space below the piston 2 of the first sliding chute 10 enters the first air groove 80 and enters the outside through the second air groove 82, the gas in the first air groove 80 is discharged outside, and the use sensitivity of the hydraulic press is enhanced; because be equipped with check valve 81 in the first gas tank 80 to prevent that external gas from getting into first spout 10, hydraulic oil gets into first gas tank 80 in first spout 10, makes the air ball come-up under the effect of buoyancy, thereby makes clean shot 83 and 82 bottom inner walls in close contact with in second gas tank, thereby hydraulic oil can not get into the external world through second gas tank 82 in the first gas tank 80, thereby avoids hydraulic oil to leak outward, thereby improves the use sensitivity of hydraulic press.
The specific working process is as follows:
hydraulic oil enters the first chute 10 from the first liquid inlet 11, so that the pressure intensity of the first chute 10 in the space below the piston 2 is increased, the threaded connection part of the cylinder barrel 1 and the cylinder cover 4 is in sealing connection with the second O-shaped sealing ring 41, so that the hydraulic oil is prevented from entering the first chute 10 and leaking out from the connection part of the cylinder cover 4 and the cylinder barrel 1, the sealing performance of the cylinder barrel 1 is enhanced, the pressure intensity of the first chute 10 in the space below the piston 2 is increased along with the continuous entering of the hydraulic oil into the first chute 10 through the first liquid inlet 11, so that the piston 2 is pushed to move upwards, the piston rod 3 is driven to move upwards, the upper end and the lower end of the circumference of the piston 2 are in sealing connection with the first Y-shaped sealing ring 25, when the hydraulic oil enters the first chute 10 and pushes the piston 2 to move upwards, the opening of the first Y-shaped sealing ring 25 at the lower end is downward, so, thereby preventing the hydraulic oil in the space below the piston 2 of the first sliding chute 10 from entering the space above the piston 2 of the first sliding chute 10, and reducing the sensitivity of the piston 2 to move up and down, the hydraulic oil passing through the first oil hole 22; the hydraulic oil enters the second chute 20, so that the pressure in the second chute 20 is increased, the two first sliding rods 21 move towards the opposite side, the two first sliding rods 21 extrude the first O-shaped sealing ring 24, the first O-shaped sealing ring 24 is further attached to the inner wall of the first chute 10, the hydraulic oil in the space below the piston 2 of the first chute 10 is prevented from entering the space above the piston 2 of the first chute 10, the use sensitivity of the piston 2 is enhanced, and the piston rod 3 moves upwards and slides in the third chute; the surface of the plunger rod 5 is connected with the second Y-shaped sealing ring 51 and the third O-shaped sealing ring 52 in a sealing mode, so that hydraulic oil in the space above the piston 2 of the first chute 10 is prevented from entering the outside, an oil leakage phenomenon is generated, the use flexibility of the hydraulic machine is reduced, the hydraulic oil is wasted, the hydraulic cost is increased, and the sealing type of the plunger rod 5 is enhanced because the plunger rod 5 is connected with the two sealing rings in a sealing mode.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (6)

1. The utility model provides a hydraulic press master cylinder which characterized in that: comprises a cylinder barrel (1), a moving unit and a sealing unit; the movement unit comprises a piston (2) and a piston rod (3); a first sliding groove (10) is formed in the cylinder barrel (1); the first sliding chute (10) is internally connected with a piston (2) in a sealing and sliding manner; a second sliding chute (20) is formed in the piston (2); the second sliding chute (20) is communicated with the side wall of the piston (2); two ends of the second sliding chute (20) are respectively connected with a first sliding rod (21) in a sealing sliding manner; two first oil holes (22) which are uniformly distributed are formed in the piston (2) below the second sliding groove (20); each first oil hole (22) is communicated with the second sliding chute (20) and the first sliding chute (10) in a space below the piston (2); three first sealing grooves (23) which are uniformly distributed are formed in the surface of the piston (2); a first O-shaped sealing ring (24) is hermetically connected in the middle first sealing groove (23); a first Y-shaped sealing ring (25) is connected in the upper and lower first sealing grooves (23) in a sealing manner; the lower end of the cylinder barrel (1) is provided with a first liquid inlet (11); the sealing unit comprises a cylinder cover (4) and a plunger rod (5); the bottom end of the cylinder barrel (1) is in threaded connection with the cylinder cover (4) through a thread groove formed in the surface of the bottom end of the cylinder barrel (1) and the cylinder cover (4); the first liquid inlet (11) is positioned above the cylinder cover (4); a second sealing groove (40) is formed in the cylinder cover (4) at the bottom end of the internal thread groove of the cylinder cover (4); the second sealing groove (40) is connected with a second O-shaped sealing ring (41) in a sealing mode; the first sliding groove (10) at the top of the cylinder barrel (1) is internally connected with a plunger rod (5) in a sealing way; the surface of the plunger rod (5) is provided with two third sealing grooves (50); a second Y-shaped sealing ring (51) is connected in the third sealing groove (50) at the bottom end in a sealing manner; a third O-shaped sealing ring (52) is connected in the third sealing groove (50) at the upper end in a sealing manner; a third sliding groove is formed in the plunger rod (5); the third sliding groove is communicated with the first sliding groove (10) and the outside; the piston rod (3) slides in the third sliding groove in a sealing manner, and the piston rod (3) extends out of the third sliding groove; the cylinder barrel (1) is provided with a second liquid inlet (12) below the plunger rod (5).
2. The master cylinder of a hydraulic press according to claim (1), characterized in that: air cavities (240) which are uniformly distributed are formed in the first O-shaped sealing ring (24), the second O-shaped sealing ring (41) and the third O-shaped sealing ring (52); the air cavity (240) is close to the inner side direction.
3. The master cylinder of a hydraulic press as claimed in claim 1, wherein: a pressure control valve (6) is fixedly connected in each first oil hole (22); each pressure control valve (6) is provided with a second oil hole (60) in the direction close to the lower surface of the piston (2); a first oil groove (61) is formed in the pressure control valve (6) at the upper end of each second oil hole (60); a second oil groove (62) is formed in the direction, close to the piston rod (3), of each pressure control valve (6); the second oil groove (62) is communicated with the first oil groove (61) and the inner diameter of the second oil groove (62) is smaller than that of the first oil groove (61); a first oil rod (620) is arranged in the first oil groove (61); the first oil rod (620) penetrates into the second oil groove (62); the diameter of a first oil rod (620) in the first oil groove (61) is larger than that of a first oil rod (620) in a second first oil rod (620); the first oil rod (620) and the first oil groove (61) are tightly attached to each other in an initial state close to the inner wall of the second oil groove (62); one end of the first oil rod (620) far away from the second oil groove (62) is fixedly connected with a baffle plate (621); the baffle (621) and the inner wall of the first oil groove (61) far away from the second oil groove (62) are not tightly attached; the baffle (621) is connected with the inner wall of the first oil groove (61) close to the first oil groove (61) through a first spring (622); the pressure control valve (6) is provided with a third oil groove (63) in the direction away from the second oil groove (62); the third oil groove (63) is communicated with the first oil groove (61) through a sliding hole (630) formed in the pressure control valve (6); the first oil rod (620) penetrates into a third oil groove (63) through a sliding hole (630); the first oil rod (620) in the third oil groove (63) is in a horn-shaped design; the third oil groove (63) is communicated with the first oil groove (61) through a fourth oil groove (64) formed in the pressure control valve (6); a second oil rod (640) is arranged in the third oil groove (63); the second oil rod (640) is fixedly connected with two sliding blocks (641) which are designed corresponding to the first oil rod (620); the two sliding blocks (641) are connected through a second spring (642); the two sliding blocks (641) are in contact with the first oil rod (620) in the initial state, and the sliding blocks (641) are in a pressing state on the first oil rod (620) in the initial state; a fourth sliding groove (643) is formed in the second oil rod (640) at the bottom end of the second oil rod (640); a second sliding rod (644) is connected in the fourth sliding groove (643) in a sliding manner; the bottom of the second sliding rod (644) is fixedly connected with the inner wall of the third oil groove (63); the bottom of the second sliding rod (644) is connected with the inner wall of the bottom of the third oil groove (63) through a third spring (645); a fifth oil groove (65) is formed in the pressure control valve (6) at the upper end of the second oil groove (62); the fifth oil groove (65) communicates the second chute (20) and the second oil groove (62).
4. The master cylinder of a hydraulic press as claimed in claim 3, wherein: a first block (7) is fixedly connected in each second oil hole (60); each first block (7) is provided with a fifth sliding chute (70); each fifth sliding groove (70) is communicated with the upper surface and the lower surface of the first block (7); a third sliding rod (71) is connected in each fifth sliding groove (70) in a sliding manner; each third sliding rod (71) is fixedly connected with a second block (72) above the first block (7); the first block (7) and the second block (72) are tightly attached in an initial state; the second oil hole (60) is fixedly connected with a third block (73) above the second block (72); the third block (73) is provided with a sixth sliding chute (74); the third sliding rod (71) penetrates into a sixth sliding chute (74); the third block (73) is connected with the second block (72) through a fourth spring (75); said fourth spring (75) being wound around a third slide bar (71); the third block (73) is provided with uniformly distributed filter holes (76); each filter hole (76) is communicated with the upper surface and the lower surface of the third block (73).
5. The master cylinder of a hydraulic press as claimed in claim 1, wherein: the upper surface and the lower surface of each piston (2) are fixedly connected with a convex block (8); the section of each protruding block (8) is designed into a right-angled triangle, and the bevel edge of the right-angled triangle is designed into an arc shape; one side of the convex block (8) is tightly attached to the inner wall of the first sliding groove (10).
6. The master cylinder of a hydraulic press as recited in claim 5, wherein: a first air groove (80) is formed in each of the convex block (8) and the piston (2); a one-way valve (81) is arranged in a first air groove (80) in each convex block (8); a second air groove (82) is not formed in the piston rod (3); the second air groove (82) is communicated with the first air groove (80) and the top surface of the piston rod (3); a hollow ball (83) is arranged at the joint of the first air groove (80) and the second air groove (82); the inner diameter of the hollow ball (83) is larger than that of the second gas groove (82); the hollow ball (83) is connected to the inner wall of the second air groove (82) through an elastic pull rope (84).
CN202110115408.3A 2021-01-28 2021-01-28 Main oil cylinder of hydraulic press Active CN112901589B (en)

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