CN109534211B - Flexible jack - Google Patents
Flexible jack Download PDFInfo
- Publication number
- CN109534211B CN109534211B CN201910066091.1A CN201910066091A CN109534211B CN 109534211 B CN109534211 B CN 109534211B CN 201910066091 A CN201910066091 A CN 201910066091A CN 109534211 B CN109534211 B CN 109534211B
- Authority
- CN
- China
- Prior art keywords
- flexible
- cavity
- pressure
- bearing bag
- bearing
- 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.)
- Active
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
- B66F3/25—Constructional features
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
- B66F3/25—Constructional features
- B66F3/35—Inflatable flexible elements, e.g. bellows
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F2700/00—Lifting apparatus
- B66F2700/05—Hydraulic jacks
- B66F2700/055—Jacks with a single cylinder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F2700/00—Lifting apparatus
- B66F2700/05—Hydraulic jacks
- B66F2700/055—Jacks with a single cylinder
- B66F2700/057—Pistons, e.g. telescopic; Cylinders or sealing joints; Hydraulic travel-limiting devices or shock damping
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides a flexible jack. The jack comprises a cylinder body, a piston rod and a piston, wherein the piston separates the cylinder body to form an upper oil cylinder and a lower oil cylinder, the lower part of the lower oil cylinder is provided with a pressurizing oil nozzle, and the upper part of the upper oil cylinder is provided with a pressure relief oil nozzle; a flexible cavity is arranged at the ejection end of the piston rod far away from the piston or on the lower lug at the bottom of the cylinder body, a flexible pressure-bearing bag matched with the cavity in shape is arranged in the flexible cavity, a flexible pressure-bearing bag pad is arranged at the position of the flexible pressure-bearing bag, which is positioned at the cavity opening of the flexible cavity, and the area of the flexible pressure-bearing bag pad is equal to the effective output area of the lower oil cylinder and is fixedly connected with the cavity opening of the flexible cavity; the flexible pressure-bearing bags are communicated with the lower oil cylinder through oil holes. The invention has definite force transmission path, solves the problems of inaccurate rock mass stress measurement, uneven stress and deformation deviation of a pressed rock mass or a rigid plate by using a hydraulic (force) steel sleeper, a flexible jack and an ordinary jack in the existing rock mass mechanical test, and improves the rock mass mechanical test quality.
Description
Technical Field
The invention belongs to the technical field of geotechnical mechanics and engineering, relates to loading equipment for a geotechnical mechanical test, and particularly relates to a flexible jack.
Background
At present, a hydraulic steel sleeper is also called as a hydraulic steel sleeper, is a loading device for a rock mass mechanical test, and is a flat oil cavity formed by bending and welding two thin steel plates with the same shape, the oil cavity wall is expanded and deformed to extrude the rock mass by adding hydraulic oil into the oil cavity, the contact area of the hydraulic steel sleeper and the pressed rock mass or a single-layer rigid plate at the early stage of the force output is increased along with the increase of the force output, the contact area of the hydraulic steel sleeper is reduced along with the increase of the force output at the later stage, the load is gradually concentrated, and the force-bearing area cannot be accurately calculated, so that the obtained rock mass force is inaccurate. Because the hydraulic steel sleeper is a shell made of steel, the hydraulic steel sleeper has high rigidity, the hydraulic steel sleeper is short in stroke and low in bearing pressure, most of deformation cannot be recovered after being used, the hydraulic steel sleeper is used again and needs to be pressed back to the original thickness by an ordinary jack, and high-pressure hydraulic oil can be sprayed out due to the fact that the steel sleeper shell is broken, so that potential safety hazards exist. Other flexible jacks basically apply pressure to an object through expansion deformation, and have the problems of short stroke, low output and the like, and are not suitable for being used as loading equipment for rock mass mechanical tests. The loading equipment has the problems that the output cannot be accurately measured, the stress of the rock mass is uneven and the deformation deviation of the rock mass is caused, so that the obtained parameters related to the rock mass mechanical test are inaccurate.
Besides, the common jack is adopted to load the backing plate, so that the load is transmitted to the rock mass, the rigid plate is attached to the surface of the rock mass, the steel plate is then superimposed on the rigid plate, then the common jack is directly used for applying the load to the superimposed steel plate, the load is transmitted to the rock mass through multiple layers, the friction loss part load is transmitted, the section of the piston rod is smaller than the section of the piston, the unbalanced load is also generated due to the concentrated force, and the load is locally concentrated, so that the problems of small actual rock mass compression load, uneven measurement value of the compression stress applied to the rock mass and rock mass deformation deviation exist.
Disclosure of Invention
The invention aims to solve the problems that the hydraulic steel sleeper is not fully flexible, the contact area of the hydraulic steel sleeper and a pressed rock body or a single-layer rigid plate is increased along with the increase of the force in the early stage of the force output, the load is gradually concentrated along with the increase of the force output, most of deformation cannot be recovered, the hydraulic steel sleeper is short in stroke and small in force output like other flexible jacks, the existing rock body mechanical test is generally characterized in that the single-layer rigid plate is attached to the surface of a test body, a steel plate is then overlapped, and then a common jack is used for loading, load loss is caused by multi-layer transmission, the load is concentrated at the front end of a piston rod, partial concentrated phenomenon exists in the load, and the problems of inaccurate force output measurement, uneven surface stress of the pressed rock body and rock body deformation deviation exist.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the flexible jack is characterized in that: the jack comprises a cylinder body, a piston rod and a piston arranged in the cylinder body, wherein the piston separates the cylinder body to form an upper oil cylinder and a lower oil cylinder, the lower part of the lower oil cylinder is provided with a pressurizing oil nozzle, and the upper part of the upper oil cylinder is provided with a pressure relief oil nozzle; a flexible cavity is arranged at the ejection end of the piston rod far away from the piston or a lower lug is arranged at the bottom of the cylinder body, a flexible pressure-bearing bag matched with the cavity in shape is arranged in the flexible cavity, a flexible pressure-bearing bag pad is arranged at the position of the flexible pressure-bearing bag, which is positioned at the cavity opening of the flexible cavity, and the area of the flexible pressure-bearing bag pad is equal to the effective output area of the lower oil cylinder and is fixedly connected with the cavity opening of the flexible cavity; the flexible pressure-bearing bags are communicated with the lower oil cylinder through oil holes, and the flexible pressure-bearing bags are filled with non-corrosive hydraulic oil from the oil holes to expand the flexible pressure-bearing bags so that the flexible pressure-bearing bag gaskets are tightly adhered to the pressure-bearing rock mass directly or through a single-layer rigid plate and the load is transferred to the pressure-bearing rock mass. The area of the flexible pressure-bearing bag pad is theoretically the same as the cross-sectional area of the lower oil cylinder, the friction between the piston and the inner wall of the cylinder body is considered, the area can be slightly smaller than the cross-sectional area of the lower oil cylinder in practice, the cross-sectional area of the lower oil cylinder of the jack is initially simulated according to the required force output, after the cylinder body, the piston and the piston rod are assembled, the jack is checked, the check coefficient is obtained, and the opening size and the wall thickness of the flexible cavity are determined, so that the area of the flexible pressure-bearing bag pad is equal to the effective output area of the lower oil cylinder; the flexible pressure-bearing bag pad is tightly attached to the surface of the rock mass or the single-layer rigid plate, the flexible pressure-bearing bag and the flexible pressure-bearing plate synchronously advance and retreat with the piston rod or the cylinder bottom plate under the same hydraulic oil pressure, the flexible pressure-bearing plate is tightly attached to the rock mass or the single-layer pressure-bearing plate, the flexible pressure-bearing bag and the flexible pressure-bearing plate cannot expand and protrude, the flexible pressure-bearing bag pad directly or uniformly transmits load to the rock mass through the single-layer rigid plate, and therefore the equal pressure stress of each point of the pressed rock mass is ensured, and the stress measurement of the rock mass is accurate.
The invention has the preferable technical scheme that: the flexible pressure-bearing bag and the flexible pressure-bearing bag pad are of an integrated structure made of non-metal materials with corrosion resistance, high toughness and high elasticity.
The invention has the preferable technical scheme that: when the flexible cavity is arranged at the ejection end of the piston rod, the flexible cavity is a cavity formed by directly cutting the end surface of the ejection end of the piston rod downwards; when the bottom of the cylinder body is provided with a flexible cavity, the flexible cavity is a cavity formed by cutting the bottom surface of the lower lug upwards; the thickness of the flexible cavity side walls is the same.
The invention has the preferable technical scheme that: the flexible cavity is in the shape of a cylinder or a truncated cone or a cube or a regular trapezoid.
The invention has the preferable technical scheme that: the cross-sectional area of the flexible pressure-bearing bag cushion is equal to that of the flexible cavity. The flexible pressure-bearing bag pad is tightly attached to the rock mass or the single-layer rigid plate surface, the flexible pressure-bearing bag pad and the flexible cavity are jointly moved back and forth, the pressure stress of each point on the flexible pressure-bearing bag pad is equal, and hydraulic oil cannot be leaked due to expansion, rupture and hydraulic oil leakage of the flexible pressure-bearing bag and the flexible pressure-bearing bag pad.
The invention has the preferable technical scheme that: the flexible pressure-bearing bag is characterized in that the cavity bag of the flexible pressure-bearing bag is an elastic sealing cavity, the shape of the cavity bag is matched with that of the flexible cavity, the flexible pressure-bearing bag is embedded in the flexible cavity, a pressure-bearing bag oil nozzle is arranged on the flexible pressure-bearing bag, the flexible pressure-bearing bag oil nozzle is in sealing butt joint with the oil through holes, and the bag outer wall of the butt joint part of the flexible pressure-bearing bag is fixedly bonded with the inner wall of the flexible cavity.
The invention has the preferable technical scheme that: when the flexible cavity is arranged at the ejection end of the piston rod, the oil through hole is formed in the central axis of the piston and the piston rod; when the bottom of the cylinder body is provided with the flexible cavity, the oil through hole is the oil through hole arranged on the central axis of the bottom plate of the cylinder body.
The invention has the preferable technical scheme that: the flexible jack also comprises a protective cover arranged on the end face of the ejection end of the piston rod or the end face of the lower lug of the cylinder body, and the protective cover is made of the same material as the piston rod or the cylinder body and covers the flexible pressure-bearing bag pad completely.
The invention has the preferable technical scheme that: the flexible pressure-bearing bag and the flexible pressure-bearing bag pad are made of rubber or a flexible composite material.
The invention has the preferable technical scheme that: the periphery of the flexible pressure-bearing bag pad of the flexible pressure-bearing bag is bonded and fixed with the end face of the cavity wall of the flexible cavity, and is not bonded with the inner wall of the flexible cavity.
The preparation method of the cylinder body, the piston and the piston rod is the same as the preparation method of the existing jack, a flexible cavity is formed by cutting in the front end of the piston rod of the jack or in the bump at the bottom of the cylinder, the shape of the flexible cavity is matched with that of the flexible cavity, a sealed cavity bag which is made of high-toughness and flexible nonmetallic materials and can bear certain pressure is adopted as a flexible pressure-bearing bag, the flexible cavity bag is arranged in the flexible cavity, an oil through hole connected with an oil nozzle of the flexible pressure-bearing bag is communicated with a lower oil cylinder, hydraulic oil is pressed into the lower oil cylinder through the pressure-bearing oil nozzle by a pressure pump, the hydraulic oil is filled into the flexible pressure-bearing bag through the oil hole, the flexible pressure-bearing bag is expanded, and the bag wall is attached to the inner wall of the flexible cylinder, the flexible pressure-bearing bag pad is tightly attached to the surface of the rock mass or the single-layer rigid plate, the flexible pressure-bearing bag pad and the flexible cylinder are integrally and jointly driven to move in and out, the oil pressure in the bag cavity is equal to the pressure of hydraulic oil in the oil cylinder, the area of the flexible pressure-bearing bag pad is equal to the effective output area of the lower oil cylinder after the friction force of the jack is considered, the pressure of the section of the wall of the flexible cavity is equal to the pressure of the hydraulic oil in the bag cavity, the flexible pressure-bearing bag pad directly or through the single-layer rigid plate transmits load to the pressed rock mass, so that the equal pressure stress of each point of the pressed rock mass is ensured, the stress measurement of the rock mass is accurate, the deformation deviation is eliminated, and the mechanical test quality of the rock mass is improved.
The flexible force-exerting jack has the advantages of clear and simple force-exerting path, reasonable and reliable structure, basically the same using method as the common jack, simple and convenient operation, solves the problems of inaccurate rock mass stress measurement, uneven stress and deformation deviation of a rock mass or a rigid plate in the existing rock mass mechanical test by using the hydraulic steel sleeper, the flexible jack and the common jack, and has practical significance for improving the rock mass mechanical test technology and test quality.
Drawings
FIG. 1 is a schematic view of a jack with a flexible chamber of the present invention disposed at the ejection end of a piston rod;
FIG. 2-1 is a top view of the flexible chamber of the present invention in square shape;
FIG. 2-2 is a top view of the flexible chamber of the present invention in a circular shape;
FIG. 3 is a schematic illustration of the structure of the flexible pressure bladder of the present invention;
FIG. 4 is a schematic view of the structure of the jack with the flexible cavity arranged at the bottom of the oil cylinder;
in the figure: 1-cylinder body, 1-lower lug, 2-upper cylinder, 3-lower cylinder, 4-piston rod, 4-1-ejection end, 5-flexible cavity, 6-flexible pressure-bearing bag, 7-pressure oil nozzle 8-pressure relief oil nozzle 9-flexible pressure-bearing bag pad, 10-pressure-bearing bag oil nozzle, 11-oil through hole and 12-piston.
Detailed Description
The invention will be further described with reference to examples and figures. The following detailed description of the embodiments of the invention, provided in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments below, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc., are based on those shown in the drawings, or those conventionally put in place when the product is used, or those conventionally understood by those skilled in the art, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
It should also be noted that unless explicitly stated or limited otherwise, terms such as "disposed," "connected," and the like should be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The first embodiment provides a flexible jack, as shown in fig. 1 to 3, including a cylinder 1, a piston rod 4, and a piston 12 disposed in the cylinder 1, where the cylinder 1 is circular, the piston 12 is circular, a piston cavity is disposed in the cylinder 1, the piston cavity is separated by the piston 12 to form an upper cylinder 2 and a lower cylinder 3, a pressurizing oil nozzle 7 is disposed at the lower part of the lower cylinder 3, a relief oil nozzle 8 is disposed at the upper part of the upper cylinder 2, and the pressurizing oil nozzle 7 and the relief oil nozzle 8 extend out of the cylinder 1 and are used for being connected with an external hydraulic pipeline. The piston rod 4 is made of high-strength steel, one end of the piston rod is connected with the piston 12, one end of the piston rod far away from the piston 12 extends out of the piston cavity, an ejection end 4-1 with the cross section identical to that of the piston 12 is arranged at the end of the piston rod, and the ejection end face of the piston rod is in contact with the surface of the pressed piece.
As in the embodiment provided in fig. 1 to 3, a flexible cavity 5 is formed on the end face of the ejection end 4-1 of the piston rod 4, the flexible cavity 5 is directly formed by cutting the end of the ejection end 4-1 of the piston rod 4, the thickness of the side walls is the same, and the cavity mouth is level with the end face of the ejection end 4-1; a flexible pressure-bearing bag 6 matched with the cavity in shape is arranged in the flexible cavity 5, and a flexible pressure-bearing bag pad 9 is arranged at the position of the flexible pressure-bearing bag 6 at the cavity opening of the flexible cavity 5. The flexible pressure-bearing bag 6 and the flexible pressure-bearing bag pad 9 are of an integrated structure made of non-metal materials with corrosion resistance, high toughness and high elasticity, are formed at one time, and specific materials can be rubber composite materials with high toughness and high flexibility. The flexible pressure-bearing bag pad 9 is fixedly bonded with the end face of the cavity wall of the flexible cavity 5, is not bonded with the inner wall of the flexible cavity 5, and the flexible pressure-bearing bag pad 9 completely covers the end face of the ejection end 4-1 of the piston rod 14, so that the flexible pressure-bearing bag pad 9 can be tightly bonded with a pressed rock mass or a rigid plate. Oil holes are formed in the axes of the piston 12 and the piston rod 4, a pressure-bearing bag oil nozzle 10 is arranged at the lower part of the flexible pressure-bearing bag 6 and corresponds to the oil holes, the pressure-bearing bag oil nozzle 10 is in butt joint communication with the oil holes in the piston rod 4 after the flexible pressure-bearing bag 6 is arranged in the flexible cavity 5, the flexible pressure-bearing bag 6 is inflated by filling non-corrosive hydraulic oil into the flexible pressure-bearing bag 6 through the oil holes, and load is transmitted to a pressed rock body through a flexible pressure-bearing bag pad 9 directly or through a single-layer rigid plate.
The inner cross sections of the lower cylinder 3 and the piston 12 of the flexible jack provided by the embodiment are the same as round, the primary radius is 17.0cm, the ejection end of the piston is cut into square, the ejection end of the square is provided with a flexible cavity 5, and the flexible jack is verified according to a semi-finished jackThe coefficient is determined, the opening size of the flexible cavity 5 is 23cm multiplied by 23cm, the wall thickness of the flexible cavity is 3.5cm, the area of the flexible pressure-bearing bag pad 9 is equal to the area of the external section of the flexible cavity 5 and is square, the side length is 30cm, and the area is 900cm 2 . The shape of the cavity 6 and the shape of the flexible cavity 5 of the flexible pressure-bearing bag in the embodiment are square, the sizes are length, width and thickness=30 cm×30cm×5cm, the cavity of the flexible pressure-bearing bag is embedded in the flexible cavity 3, and the outer wall of the flexible pressure-bearing bag close to the oil nozzle 10 of the flexible pressure-bearing bag 6 is fixedly bonded with the inner wall of the flexible cavity 3. In order to increase the bearing internal pressure of the flexible cavity 5, a reinforcing steel hoop can be sleeved on the part of the piston rod 4 corresponding to the flexible cavity 5.
The main parameters of the jack of the whole flexible force in the first embodiment are as follows: the height of the body is 35cm, the outer diameter of the oil cylinder is 42cm, the inner diameter of the oil cylinder is 34cm, and the area of the flexible pressure-bearing bag pad is 900cm 2 The length of the flexible cavity is multiplied by the width of the flexible cavity and the depth of the flexible cavity are multiplied by 30cm multiplied by 5cm, the wall thickness of the flexible cavity is 3.5cm, the stroke is 10cm, the extension height is 45cm, the rated pressure is 63MPa, the rated output is 5670kN, and the self weight is 355kg.
In the flexible jack provided in the first embodiment, the working medium filled in the upper cylinder 2, the lower cylinder 3 and the flexible pressure-bearing bag 9 is non-corrosive hydraulic oil, the pressurizing oil nozzle 7 and the depressurizing oil nozzle 8 are respectively connected with an external pressurizing pump and the like, the specific work after connection is the same as that of the existing jack, when the flexible jack is used specifically, the pressurizing oil is pressed into the lower cylinder 3 through the pressurizing oil nozzle 7 by the pressurizing pump, the hydraulic oil is filled into the flexible pressure-bearing bag 6 through the oil through holes on the piston rod 4, the flexible pressure-bearing bag 6 is filled with the hydraulic oil, the bag wall is attached to the inner wall of the flexible cavity 5, the flexible pressure-bearing bag 9 and the flexible cavity 5 are integrally cooperated to exert force, so that the pressure-bearing bag 9 is tightly attached to the surface of the pressure-bearing rock or the single-layer rigid plate, the pressure of the flexible pressure-bearing bag 9 is equal to the hydraulic oil pressure of the flexible pressure-bearing bag 9 due to the area of the effective force exerted by the cylinder 1, the pressure of the wall section of the flexible pressure-bearing bag 9 is equal to the hydraulic oil pressure of the flexible pressure-bearing bag 9, the output force is measured accurately, so that the pressure stress of each point of the pressure-bearing rock is ensured, and deformation deviation is eliminated.
The structure of the cylinder body 1, the piston rod 4 and the piston of the flexible jack provided by the second embodiment is the same as that of the first embodiment, and the difference is that a flexible cavity is not arranged at the pushing end of the piston rod, a lower protruding block 1-1 with the width the same as that of the piston 12 is arranged at the bottom of the cylinder body 1, an upward flexible cavity 5 is arranged at the bottom surface of the lower protruding block 1-1, a flexible pressure-bearing bag 6 matched with the cavity in shape is arranged in the flexible cavity 5, a flexible pressure-bearing bag pad 9 is arranged at the position of the flexible pressure-bearing bag 6 at the cavity opening of the flexible cavity 5, and the area of the flexible pressure-bearing bag pad 9 is equal to the effective output area of the lower oil cylinder 3 and is fixedly connected with the cavity opening of the flexible cavity 5; the flexible pressure-bearing bag 6 is communicated with the lower oil cylinder 3 through the oil through holes 11 arranged on the central axis of the bottom plate of the cylinder body 1, the flexible pressure-bearing bag 6 is filled with non-corrosive hydraulic oil from the oil through holes 11 to enable the pressure-bearing bag pad 9 to be tightly attached to the surface of the pressed rock mass or the single-layer rigid plate, the flexible pressure-bearing bag pad 9 and the flexible cavity 5 are integrally and cooperatively powered, as the area of the flexible pressure-bearing bag pad 9 is equal to the effective power output area of the oil cylinder 1, the pressure of the flexible pressure-bearing bag pad 9 on the wall section of the flexible cavity 5 is equal to the hydraulic oil pressure of the flexible pressure-bearing bag pad 9, the flexible pressure-bearing bag pad 9 directly or through the single-layer rigid plate transmits the load to the pressed rock mass, the output measurement is accurate, so that the pressure stress of each point of the pressed rock mass is equal, and deformation deviation is eliminated.
In the flexible jack provided in the second embodiment, the working medium filled in the upper cylinder 2, the lower cylinder 3 and the flexible pressure-bearing bag 9 is non-corrosive hydraulic oil, the pressurizing oil nozzle 7 and the depressurizing oil nozzle 8 are respectively connected with an external pressurizing pump and the like, the specific work after connection is the same as that of the existing jack, when the flexible jack is used specifically, the pressurizing oil nozzle 7 is used for pressing the hydraulic oil into the lower cylinder 3 through the pressurizing pump, the hydraulic oil is filled into the flexible pressure-bearing bag 6 through the oil through holes on the cylinder body 1, the flexible pressure-bearing bag 6 is filled with the hydraulic oil, the bag wall is attached to the inner wall of the flexible cavity 5, the flexible pressure-bearing bag 9 and the flexible cavity 5 are integrally and jointly exerted, and the area of the flexible pressure-bearing bag 9 is equal to the effective output area of the oil cylinder 1, and the pressure of the flexible pressure-bearing bag 9 on the cross section of the wall of the flexible cavity 5 is equal to the hydraulic oil pressure of the flexible pressure-bearing bag 9, so that the pressure measurement of each point of the pressed rock is ensured to be equal, and deformation deviation is eliminated.
The flexible jack of the invention further comprises a protective cover arranged on the end face of the ejection end 4-1 of the piston rod 4 or the end face of the lower protruding block 1-1 of the cylinder body 1, wherein the protective cover is made of the same material as the piston rod or the cylinder body, and the flexible pressure-bearing bag pad 9 is completely covered. The protective cover can be sleeved outside the flexible cavity 5, and the inner wall of the protective cover is attached to the outer wall of the pressure-bearing bag pad 9, so that the jack can be used as an ordinary jack or can be detached to be used as a flexible jack.
The foregoing description of only two of the embodiments of the present invention is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.
Claims (8)
1. A flexible jack, characterized in that: the jack comprises a cylinder body (1), a piston rod (4) and a piston (12) arranged in the cylinder body (1), wherein the piston (12) separates the cylinder body (1) to form an upper oil cylinder (2) and a lower oil cylinder (3), a pressurizing oil nozzle (7) is arranged at the lower part of the lower oil cylinder (3), and a relief oil nozzle (8) is arranged at the upper part of the upper oil cylinder (2); the method comprises the steps that an ejection end (4-1) of a piston rod (4) far away from a piston (12) or a lower protruding block (1-1) is arranged at the bottom of a cylinder body (1), a flexible cavity (5) is arranged on the lower protruding block (1-1), a flexible pressure-bearing bag (6) matched with the cavity in shape is arranged in the flexible cavity (5), a flexible pressure-bearing bag pad (9) is arranged at a cavity opening part of the flexible cavity (5) of the flexible pressure-bearing bag (6), and the area of the flexible pressure-bearing bag pad (9) is equal to the effective output area of a lower oil cylinder (3) and is fixedly connected with the cavity opening of the flexible cavity (5); the flexible pressure-bearing bags (6) are communicated with the lower oil cylinder (3) through oil holes (11), and non-corrosive hydraulic oil is filled into the flexible pressure-bearing bags (6) from the oil holes (11) to expand the flexible pressure-bearing bags (6) so that the flexible pressure-bearing bag gaskets (9) are tightly attached to the pressure-bearing rock mass directly or through a single-layer rigid plate, and the load is uniformly transferred to the pressure-bearing rock mass; the flexible pressure-bearing bag (6) is characterized in that the cavity of the flexible pressure-bearing bag (6) is an elastic sealing cavity, the shape of the cavity is matched with that of the flexible cavity (5), the cavity is embedded in the flexible cavity (5), the flexible pressure-bearing bag (6) is provided with a pressure-bearing bag oil nozzle (10), the pressure-bearing bag oil nozzle (10) is in sealing butt joint with the oil through hole (11), and the outer wall of the butt joint part of the flexible pressure-bearing bag (6) is fixedly bonded with the inner wall of the flexible cavity (5); the flexible cavity (5) is in a cylinder shape or a truncated cone shape or a cube shape or a regular trapezoid shape.
2. A flexible jack according to claim 1, wherein: the flexible pressure-bearing bag (6) and the flexible pressure-bearing bag pad (9) are of an integrated structure made of non-metal materials with corrosion resistance, high toughness and high elasticity.
3. A flexible jack according to claim 1 or claim 2, wherein: when the flexible cavity (5) is arranged at the ejection end of the piston rod (4), the flexible cavity (5) is a cavity formed by directly cutting downwards at the end face of the ejection end (4-1) of the piston rod; when the flexible cavity (5) is arranged at the bottom of the cylinder body (1), the flexible cavity (5) is a cavity formed by cutting upwards the bottom surface of the lower lug (1-1); the thickness of the side wall of the flexible cavity (5) is the same.
4. A flexible jack according to claim 1 or claim 2, wherein: the external cross section area of the flexible pressure-bearing bag pad (9) is equal to that of the cavity opening of the flexible cavity (5).
5. A flexible jack according to claim 1 or claim 2, wherein: when the flexible cavity (5) is arranged at the ejection end (4-1) of the piston rod, the oil through hole (11) is an oil through hole arranged on the central axis of the piston (12) and the piston rod (4); when the flexible cavity (5) is arranged at the bottom of the cylinder body (1), the oil through hole (11) is an oil through hole arranged on the central axis of the bottom plate of the cylinder body.
6. A flexible jack according to claim 1 or claim 2, wherein: the flexible jack further comprises a protective cover arranged on the end face of the ejection end (4-1) of the piston rod (4) or the end face of the lower lug (1-1) of the cylinder body (1), and the protective cover is made of the same material as the piston rod or the cylinder body and covers the flexible pressure-bearing bag pad (9) completely.
7. A flexible jack according to claim 1 or claim 2, wherein: the flexible pressure-bearing bag (6) and the flexible pressure-bearing bag pad (9) are made of rubber or a flexible composite material.
8. A flexible jack according to claim 1 or claim 2, wherein: the periphery of the flexible pressure-bearing bag pad (9) of the flexible pressure-bearing bag (6) is bonded and fixed with the end face of the cavity wall of the flexible cavity (5) and is not bonded with the inner wall of the flexible cavity (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910066091.1A CN109534211B (en) | 2019-01-24 | 2019-01-24 | Flexible jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910066091.1A CN109534211B (en) | 2019-01-24 | 2019-01-24 | Flexible jack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109534211A CN109534211A (en) | 2019-03-29 |
| CN109534211B true CN109534211B (en) | 2023-10-27 |
Family
ID=65838353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910066091.1A Active CN109534211B (en) | 2019-01-24 | 2019-01-24 | Flexible jack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109534211B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118211B (en) * | 2019-05-28 | 2023-11-28 | 长江水利委员会长江科学院 | Square cylinder and sealing ring and sealing structure used in square cylinder |
| CN110219682A (en) * | 2019-05-31 | 2019-09-10 | 平顶山平煤机煤矿机械装备有限公司 | Anti-impacting upright column with high resiliency detachable apparatus |
| CN110579306A (en) * | 2019-09-17 | 2019-12-17 | 长江水利委员会长江科学院 | Vibrating wire type pressure sensor |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB874404A (en) * | 1959-03-11 | 1961-08-10 | Pynford Ltd | Improvements in or relating to jacking devices |
| CN2575082Y (en) * | 2002-09-24 | 2003-09-24 | 同济大学 | Scissor type hydraulic lift |
| CN1740083A (en) * | 2005-08-29 | 2006-03-01 | 杨天敏 | Flexible jack |
| CN101531331A (en) * | 2008-03-12 | 2009-09-16 | 北京纽希液压技术研究所 | Novel hydraulic lifting jack |
| CN101598160A (en) * | 2008-06-06 | 2009-12-09 | 同济大学 | Pressure stabilizing device for hydraulic loading |
| CN105152070A (en) * | 2015-07-10 | 2015-12-16 | 徐州市建科技术有限公司 | Integrated jack for static load test of building pile foundation |
| CN106545529A (en) * | 2016-12-22 | 2017-03-29 | 杭州天恒机械有限公司 | Can adjust automatically oil cylinder internal pressure hydraulic jack dynamical system |
| CN206336974U (en) * | 2016-12-21 | 2017-07-18 | 缙云县赵氏工具有限公司 | A kind of controlled vehicle-mounted electrical hydraulic jack |
| CN207390901U (en) * | 2017-11-01 | 2018-05-22 | 江苏凯恩特机械设备制造有限公司 | A kind of super-pressure mechanical caging hydraulic jack |
| CN108584830A (en) * | 2018-05-14 | 2018-09-28 | 长江三峡通航管理局 | A kind of hydraulic jack and control method with mechanical self-latching protective device |
| CN209583496U (en) * | 2019-01-24 | 2019-11-05 | 长江水利委员会长江科学院 | A kind of flexible jack |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2905428A1 (en) * | 2006-09-06 | 2008-03-07 | Hydro Leduc Soc Par Actions Si | HYDRAULIC CYLINDER WITH AUTOMATIC LOCK |
-
2019
- 2019-01-24 CN CN201910066091.1A patent/CN109534211B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB874404A (en) * | 1959-03-11 | 1961-08-10 | Pynford Ltd | Improvements in or relating to jacking devices |
| CN2575082Y (en) * | 2002-09-24 | 2003-09-24 | 同济大学 | Scissor type hydraulic lift |
| CN1740083A (en) * | 2005-08-29 | 2006-03-01 | 杨天敏 | Flexible jack |
| CN101531331A (en) * | 2008-03-12 | 2009-09-16 | 北京纽希液压技术研究所 | Novel hydraulic lifting jack |
| CN101598160A (en) * | 2008-06-06 | 2009-12-09 | 同济大学 | Pressure stabilizing device for hydraulic loading |
| CN105152070A (en) * | 2015-07-10 | 2015-12-16 | 徐州市建科技术有限公司 | Integrated jack for static load test of building pile foundation |
| CN206336974U (en) * | 2016-12-21 | 2017-07-18 | 缙云县赵氏工具有限公司 | A kind of controlled vehicle-mounted electrical hydraulic jack |
| CN106545529A (en) * | 2016-12-22 | 2017-03-29 | 杭州天恒机械有限公司 | Can adjust automatically oil cylinder internal pressure hydraulic jack dynamical system |
| CN207390901U (en) * | 2017-11-01 | 2018-05-22 | 江苏凯恩特机械设备制造有限公司 | A kind of super-pressure mechanical caging hydraulic jack |
| CN108584830A (en) * | 2018-05-14 | 2018-09-28 | 长江三峡通航管理局 | A kind of hydraulic jack and control method with mechanical self-latching protective device |
| CN209583496U (en) * | 2019-01-24 | 2019-11-05 | 长江水利委员会长江科学院 | A kind of flexible jack |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109534211A (en) | 2019-03-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109534211B (en) | Flexible jack | |
| CN105865930B (en) | A kind of experimental rig realized in rock pore different stress paths and add off-load | |
| CN107101875A (en) | The universal high pressure confined pressure calibration instrument of many bores of hollow inclusion geostress survey self sealss | |
| CN104594350A (en) | Pore pressure counterforce steel pipe pile pulling method and pipe pulling device thereof | |
| CN100587460C (en) | End face seal steel tube pressure-measuring method | |
| CN109163977A (en) | Ground pressure and hydraulic pressure combination loading slopes wall force simulation pilot system and method | |
| CN209583496U (en) | A kind of flexible jack | |
| KR101172480B1 (en) | Large Volume Water Hammer Cushion and Fabrication Method of That | |
| CN110044719B (en) | Triaxial compression test device and method for discrete gangue | |
| CN105092108B (en) | The test wrapper of radial direction contact stress inside and outside a kind of measurable packing element | |
| CN203267139U (en) | Mould for testing injection molding machine and injection molding machine testing device | |
| CN212008146U (en) | Rock mass test flexible oil cylinder and loading system with same | |
| CN112881192A (en) | Test fixture, test device and test method for testing hoop tensile property of pipe fitting | |
| CN110095236A (en) | A kind of packing element sealing property testing equipment | |
| CN204900366U (en) | Energy storage ware capsule | |
| CN110567811B (en) | Concrete body confining pressure loading device for anchor cable drawing experiment | |
| CN111366473A (en) | Flexible oil cylinder for rock mass test, loading system and installation method of flexible oil cylinder | |
| Tucker | Design and experimental evaluation of a high energy density elastomeric strain energy accumulator | |
| CN211717990U (en) | Hydraulic pillow suitable for unparallel loading surface | |
| CN204475337U (en) | A kind of hole pressure counter-force steel pipe pile pile pulling device | |
| CN106680078A (en) | Rock tensile test system capable of applying confining pressure | |
| CN109236761B (en) | Hydraulic energy storage control method and hydraulic energy storage device thereof | |
| CN108951718B (en) | Physical model test equipment and method for simulating foundation pit excavation | |
| CN220039790U (en) | Pressure accumulator type product inflation and deflation test device | |
| CN211697277U (en) | Testing arrangement that oil reservoir casing external pressure was crowded to destroy |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |