CN211895855U - Vertical jack - Google Patents
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- CN211895855U CN211895855U CN201922251498.XU CN201922251498U CN211895855U CN 211895855 U CN211895855 U CN 211895855U CN 201922251498 U CN201922251498 U CN 201922251498U CN 211895855 U CN211895855 U CN 211895855U
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Abstract
The utility model belongs to the jack field, in particular to a vertical jack, which comprises an outer sleeve cavity and an oil cylinder cavity, wherein the outer sleeve cavity and the oil cylinder cavity can realize oil return through the communication of an external oil circuit; the piston rod is characterized by also comprising a large piston rod, a middle piston rod and a small piston rod which are sequentially nested and are all provided with piston heads; the process that the piston small rod compresses the piston rod cavity I is the first stroke of the jack; the process that the middle rod of the piston compresses the second piston rod cavity forms a second stroke of the jack; the process that the big piston rod compresses the oil cylinder cavity forms the third stroke of the jack; the oil drain hole III is formed in a communicated oil way between the oil cylinder cavity and the outer sleeve cavity, so that the first stroke, the second stroke and the third stroke of the jack in a load state have the same descending speed. The lifting jack has multiple strokes, and each stroke has the same descending speed, so that the working stability of the lifting jack is effectively ensured.
Description
Technical Field
The utility model belongs to the jack field, concretely relates to vertical jack.
Background
In order to adapt to the development and application of various mechanical processing industries, maintenance industries, transportation industries and the like, the vertical jack is gradually improved from single formation to multi-stroke. The vertical three-stroke jack disclosed in the chinese patent CN201530703U comprises a cylinder body, wherein a pump body is arranged on one side of the cylinder body, a lifting rod is arranged on the pump body, an oil path a and an oil path B are respectively arranged at the lower end of the pump body, the oil path a is communicated with an oil cavity at the lower end of a primary piston rod, the oil path B is communicated with an oil storage chamber, a secondary piston rod is arranged in the primary piston rod, and a tertiary piston rod is arranged in the secondary piston rod; the primary piston rod, the secondary piston rod and the tertiary piston rod are respectively provided with an oil seal; an oil return valve is arranged on the cylinder body and is connected with an oil cavity at the lower end of the primary piston rod; an oil return hole is formed in the bottom of the oil storage chamber and is communicated with an oil cavity at the lower end of the primary piston rod through an oil return valve. There is also german patent EP2025638a1 which has the same principle as CN201530703U in multiple strokes, i.e. multiple-step piston rod communication.
The problems existing in the technical scheme are as follows: the tertiary piston rods have different download speeds when loaded, which affects the stability of the jack during operation.
SUMMERY OF THE UTILITY MODEL
The utility model provides a vertical jack, it has the multi-stroke to every stroke has the same falling speed, effectively guarantees the stability of jack work.
In order to achieve the technical purpose, the application provides a vertical jack which comprises an outer sleeve cavity and an oil cylinder cavity, wherein the outer sleeve cavity and the oil cylinder cavity can be communicated through an external oil way to achieve oil return; the piston is characterized by also comprising a small piston rod, a middle piston rod and a large piston rod, wherein the small piston rod, the middle piston rod and the large piston rod are respectively provided with a piston head at one end;
the piston small rod is nested in the piston middle rod in an axial movement mode, a first piston rod cavity is formed between the piston head of the piston small rod and the piston middle rod, and the process that the piston head compresses the first piston rod cavity when the piston small rod moves axially is defined as the first stroke of the jack;
the piston middle rod is nested in the piston large rod in an axial moving mode, a piston rod cavity II is formed between the piston head of the piston middle rod and the piston large rod, and the process that the piston head of the piston middle rod compresses the piston rod cavity II when the piston middle rod moves axially is defined as a second stroke of the jack;
the large piston rod is arranged in the oil cylinder cavity in an axial movement mode, and the third stroke of the jack is formed by the process that the piston head of the large piston rod compresses the oil cylinder cavity when the large piston rod moves axially;
the oil drain hole III is formed in a communicated oil way between the oil cylinder cavity and the outer sleeve cavity, so that the first stroke, the second stroke and the third stroke of the jack in a load state have the same descending speed.
As an improved technical scheme of the application, the cross-sectional area of a first oil drain hole is defined as S1, the cross-sectional area of a first piston rod cavity is defined as S11, and the ratio of S11 to S1 is defined as A1; defining the cross-sectional area of the oil drain hole I as S2, the cross-sectional area of the piston rod cavity I as S22, and the ratio of S22 to S2 as A2; defining the cross section area of the oil drain hole as S3, the cross section area of the oil cylinder cavity as S33, and the ratio of S33 to S3 as A3; wherein, A1: a2: a3 ═ 1: (1.8-2.1): (3.8-4.2).
As an improved technical scheme of the application, a piston head on a piston middle rod is provided with a first oil return valve.
As the improved technical solution of this application, the oil return valve one includes:
the first valve body is provided with a through hole combination communicated with the first piston rod cavity and the second piston rod cavity; the through hole combination comprises a ball mounting hole and a spring mounting hole which are coaxially arranged in sequence; the first spring mounting hole is communicated with the second piston rod cavity, the first ball mounting hole is communicated with the first piston rod cavity, and the diameter of the first ball mounting hole is larger than the maximum diameter of the first spring mounting hole;
the first ball is arranged in the first ball mounting hole and is blocked in the first spring mounting hole under the action of positive oil pressure difference between the first piston rod cavity and the second piston rod cavity; meanwhile, the first ball can move axially along the combination of the through holes under the action of negative oil pressure difference between the first piston rod cavity and the second piston rod cavity so as to remove the blockage of the first spring mounting hole;
one end of the first spring is fixed in the first spring mounting hole, and the other end of the first spring applies force to the first ball, so that the first ball is suspended on the first spring mounting hole when the first piston rod cavity and the second piston rod cavity have no oil pressure difference.
As the improved technical scheme of the application, the first spring mounting hole is adjacent to the second piston rod cavity, and a step surface is arranged in the first spring mounting hole to fix the first spring.
As an improved technical scheme of the application, a piston head on a piston middle rod is provided with a second oil return valve.
As the improved technical scheme of this application, oil return valve two includes:
the valve body is provided with a through hole combination for communicating the piston rod cavity II with the oil cylinder cavity; the through hole combination comprises a second spring mounting hole and a second ball mounting hole which are coaxially arranged in sequence; the mounting hole of the second spring is communicated with the oil cylinder cavity, the mounting hole of the second ball is communicated with the second piston rod cavity, and the diameter of the mounting hole of the second ball is larger than the maximum diameter of the mounting hole of the second spring;
the second ball is arranged in the second ball mounting hole and is blocked in the second spring mounting hole under the action of the positive oil pressure difference between the second piston rod cavity and the oil cylinder cavity; meanwhile, the second ball can move axially along the combination of the through holes under the action of the negative oil pressure difference between the second piston rod cavity and the cylinder cavity so as to remove the blockage of the second spring mounting hole;
one end of the second spring is fixed in the second spring mounting hole, and the other end of the second spring applies force to the second ball so that the second ball is suspended on the second spring mounting hole when the second piston rod cavity and the oil cylinder cavity are free of oil pressure difference.
As the improved technical scheme of the application, the second spring mounting hole is adjacent to the oil cylinder cavity, and the second spring mounting hole is provided with a step surface for fixing the second spring.
As the improved technical scheme of the application, the small piston rod slides along the inner wall of the middle piston rod to compress the end of the first piston rod cavity, and the periphery of the end is provided with a first oil seal;
the piston middle rod slides along the inner wall of the piston large rod to compress the end of the piston rod cavity II, and an oil seal II is arranged on the periphery of the end of the piston rod cavity II;
the piston large rod moves along the inner wall of the oil cylinder cavity to compress the end of the oil cylinder cavity, and the periphery of the piston large rod is provided with an oil seal III.
As the improved technical scheme of the application, the oil return device further comprises an oil return valve assembly, wherein the oil return valve assembly is arranged in an oil way communicated with the outer sleeve cavity and the oil cylinder cavity;
the oil return valve assembly comprises a valve body,
the oil return valve body is provided with an oil drainage hole III;
the oil return valve core is arranged in the oil return valve body and comprises a ball thirteen and a spring thirteen, and the spring thirteen is used for supporting the ball thirteen to plug the oil drain hole three;
the thimble assembly is arranged in the oil return valve body and comprises a thimble spring and an oil return valve thimble, and the thimble spring is used for supporting the bottom of the oil return valve thimble so that the oil return valve thimble is positioned above the thirteen balls; the top of the oil return valve thimble is connected with an external force application part, and the oil return valve thimble can press the ball thirteen under the action of downward external force so as to realize the removal of the blockage of the oil drain hole III by the ball thirteen.
Advantageous effects
The multi-stroke descending method of the jack adopts the multiple sections of piston rods with different sizes to realize multi-stroke descending of the jack, and is different from the essence of the prior art in that the design of each oil drainage hole ensures that each formation of the jack has the same descending speed in the descending process.
The oil drain hole is designed in a small size to play a similar damping role in the application process, so that the multi-section piston rod can realize a slow-speed descending function under load.
The design of the oil return valve is combined with an external oil way to realize that hydraulic oil in the outer sleeve cavity can flow into the oil cylinder cavity, the piston rod cavity II and the piston rod cavity I step by step, so that the piston rod is restored to a state to be used. Each case can integrated into one piece processing in each valve body of this application, can make the case precision higher through the selection material, and the quality is more stable, and easy maintenance, with low costs. Meanwhile, each valve body is matched with the ball body through the spring, so that the structure is simple, the replaceability is strong, and the operation process is simple; the jack can return oil quickly when no load exists, and the performance is stable when the jack is loaded.
To sum up, the jack piston rod of this application simple structure can descend at the uniform velocity under the load condition, can return oil fast when no-load, effectively guarantees the performance and the life of jack to each piston rod can be dismantled the maintenance.
Drawings
FIG. 1 is a schematic diagram of a vertical jack according to the present invention;
FIG. 2 is a close-up view of a piston rod cavity of a jack according to the present invention;
FIG. 3 is a partially enlarged view of a second piston rod cavity of a vertical jack according to the present invention;
FIG. 4 is a partial enlarged view of the oil return valve assembly of the present application in a vertical jack;
in the figure: 1. a piston small rod; 2. a piston rod; 3. a piston large rod; 4. a piston rod cavity I; 5. a piston rod cavity II; 6. a cylinder chamber; 7. a first oil drainage hole; 8. a second oil drainage hole; 9. a third oil drainage hole; 10. an outer sleeve cavity; 11. a first oil return valve; 12. an oil return valve II; 13. an oil return valve assembly; 14. pedaling; 15. an oil return valve thimble; 16. a thimble spring; 17. a spring thirteen; 18. and a ball thirteen.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the following description will clearly and completely describe the technical solution of the embodiments of the present invention by combining the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "inner" in the present invention means that the direction of the inside of the pointing device is inner, not to the specific limitation of the device of the present invention, relative to the device itself.
The term "connected" as used herein may mean either a direct connection between elements or an indirect connection between elements through other elements.
The vertical jack shown in fig. 1 comprises an outer sleeve cavity 10 and an oil cylinder cavity 6, wherein the outer sleeve cavity 10 and the oil cylinder cavity 6 can be communicated through an external oil path to realize oil return; the piston is characterized by also comprising a small piston rod 1, a middle piston rod 2 and a large piston rod 3, wherein the piston head is arranged at one end of the small piston rod;
the piston small rod 1 is nested in the piston middle rod 2 in an axial moving mode, a piston rod cavity I4 is formed between the piston head of the piston small rod 1 and the piston middle rod 2, and the process that the piston head compresses the piston rod cavity I4 when the piston small rod 1 moves axially is defined as a first stroke of the jack;
the piston middle rod 2 is nested in the piston large rod 3 in an axial moving mode, a piston rod cavity II 5 is formed between the piston head of the piston middle rod 2 and the piston large rod 3, and the process that the piston head of the piston middle rod 2 compresses the piston rod cavity II 5 when the piston middle rod 2 moves axially is defined as a second stroke of the jack;
the large piston rod 3 is arranged in the cylinder cavity 6 in an axial movement mode, and a third stroke of the jack is formed by the process that the piston head of the large piston rod 3 compresses the cylinder cavity 6 when the large piston rod moves axially;
the piston head on the piston middle rod 2 is provided with a first oil drainage hole 7, the piston head on the piston large rod 3 is provided with a second oil drainage hole 8, and a third oil drainage hole 9 is formed in a communicated oil way between the cylinder cavity 6 and the outer sleeve cavity 10, so that the first stroke, the second stroke and the third stroke of the jack have the same descending speed in a load state.
As an improved technical scheme of the application, the cross-sectional area of the oil drainage hole I7 is defined as S1, the cross-sectional area of the piston rod cavity I4 is defined as S11, and the ratio of S11 to S1 is defined as A1; defining the cross-sectional area of the oil drain hole I7 as S2, the cross-sectional area of the piston rod cavity I4 as S22, and the ratio of S22 to S2 as A2; the cross section area of the oil drain hole III 9 is defined as S3, the cross section area of the oil cylinder cavity 6 is defined as S33, and the ratio of S33 to S3 is defined as A3; wherein, A1: a2: a3 ═ 1: (1.8-2.1): (3.8-4.2).
As the improved technical scheme of the application, the piston head on the piston middle rod 2 is provided with a first oil return valve 11.
As an improved technical solution of the present application, the first oil return valve 11 includes:
the first valve body is provided with a through hole combination for communicating the first piston rod cavity 4 with the second piston rod cavity 5; the through hole combination comprises a ball mounting hole and a spring mounting hole which are coaxially arranged in sequence; the first spring mounting hole is communicated with the second piston rod cavity 5, the first ball mounting hole is communicated with the first piston rod cavity 4, and the diameter of the first ball mounting hole is larger than the maximum diameter of the first spring mounting hole;
the first ball is arranged in the first ball mounting hole and is blocked in the first spring mounting hole under the action of positive oil pressure difference between the first piston rod cavity 4 and the second piston rod cavity 5; meanwhile, the first ball can move axially along the combination of the through holes under the action of negative oil pressure difference between the first piston rod cavity 4 and the second piston rod cavity 5 so as to remove the blockage of the first spring mounting hole;
one end of the first spring is fixed in the first spring mounting hole, and the other end of the first spring applies force to the first ball, so that the first ball is suspended on the first spring mounting hole when the first piston rod cavity 4 and the second piston rod cavity 5 do not have oil pressure difference.
As the improved technical scheme of the application, the first spring mounting hole is adjacent to the second piston rod cavity 5, and a step surface is arranged in the first spring mounting hole to fix the first spring.
As the improved technical scheme of the application, the piston head on the piston middle rod 2 is provided with a second oil return valve 12.
As an improved technical solution of the present application, the second oil return valve 12 includes:
the valve body is provided with a through hole combination for communicating the piston rod cavity II 5 with the oil cylinder cavity 6; the through hole combination comprises a second spring mounting hole and a second ball mounting hole which are coaxially arranged in sequence; the mounting hole of the second spring is communicated with the oil cylinder cavity 6, the mounting hole of the second ball is communicated with the second piston rod cavity 5, and the diameter of the mounting hole of the second ball is larger than the maximum diameter of the mounting hole of the second spring;
the second ball is arranged in the second ball mounting hole and is blocked in the second spring mounting hole under the action of the positive oil pressure difference between the second piston rod cavity 5 and the oil cylinder cavity 6; meanwhile, the second ball can move axially along the combination of the through holes under the action of the negative oil pressure difference between the second piston rod cavity 5 and the oil cylinder cavity 6 so as to remove the blockage of the second spring mounting hole;
one end of the second spring is fixed in the second spring mounting hole, and the other end of the second spring applies force to the second ball so that the second ball is suspended on the second spring mounting hole when the second piston rod cavity 5 and the cylinder cavity 6 do not have oil pressure difference.
As the improved technical scheme of the application, the second spring mounting hole is adjacent to the oil cylinder cavity 6, and a step surface is arranged on the second spring mounting hole to fix the second spring.
As the improved technical scheme of the application, the small piston rod 1 slides along the inner wall of the middle piston rod 2 to compress the end of the first piston rod cavity 4, and the periphery of the end is provided with an oil seal I;
the piston middle rod 2 slides along the inner wall of the piston large rod 3 to compress the end of the piston rod cavity II 5, and an oil seal II is arranged at the periphery;
the piston large rod 3 moves along the inner wall of the oil cylinder cavity 6 to compress the end of the oil cylinder cavity 6, and the periphery of the piston large rod is provided with an oil seal III.
As an improved technical scheme of the application, the oil cylinder further comprises an oil return valve assembly 13, wherein the oil return valve assembly 13 is arranged in an oil path communicated with the outer sleeve cavity 10 and the oil cylinder cavity 6;
the oil return valve assembly 13 comprises a valve member,
the oil return valve body is provided with a third oil drainage hole 9;
the oil return valve core is arranged in the oil return valve body and comprises a ball thirteen 18 and a spring thirteen 17, and the spring thirteen 17 is used for supporting the ball thirteen 18 to plug the oil drain hole three 9;
the thimble assembly is arranged in the oil return valve body and comprises a thimble spring 16 and an oil return valve thimble 15, and the thimble spring 16 is used for supporting the bottom of the oil return valve thimble 15 so that the oil return valve thimble 15 is positioned above the thirteen balls 18; the top of the oil return valve thimble 15 is connected with an external force application part, and under the action of a downward external force, the oil return valve thimble 15 can press the ball thirteen 18 downwards so as to remove the blockage of the oil drain hole three 9 by the ball thirteen 18.
Example 1
A vertical jack comprises an outer sleeve cavity 10 and an oil cylinder cavity 6, wherein the outer sleeve cavity 10 and the oil cylinder cavity 6 can be communicated through an external oil way to realize oil return; the intercommunication of jar chamber 6 and outer jacket chamber 10 can adopt any connected mode of prior art, in order to realize the technical function of this application, only need guarantee in this oil circuit can be through the installation such as valve body subassembly, foraminiferous part etc for have the draining aperture in this oil circuit.
In order to realize the bearing function of the jack, in the embodiment, a piston large rod 3, a piston middle rod 2 and a piston small rod 1 are sequentially nested in a cylinder cavity 6. The characteristics of the piston rod of the various dimensions here are: the piston rod is a rod-shaped member with a hollow structure of a normal piston rod, and a piston head is arranged at one end of the hollow structure. The difference is that the piston small rod 1 of the smallest size is at the other end of the hollow structure the bearing end of the jack structure.
Explanation: the piston large rod 3, the piston middle rod 2 and the piston small rod 1 are named by piston rods according to sizes, wherein the sizes of the piston large rod 3, the piston middle rod 2 and the piston small rod 1 are reduced in sequence.
The piston rods with various sizes are nested in sequence, and the method comprises the following specific steps:
as shown in fig. 2, the small piston rod 1 is nested in the middle piston rod 2 in a manner of being capable of moving axially, a first piston rod cavity 4 is formed between the piston head of the small piston rod 1 and the middle piston rod 2, and a process that the piston head of the small piston rod 1 compresses the first piston rod cavity 4 when the small piston rod 1 moves axially is defined as a first stroke of the jack;
the piston middle rod 2 is nested in the piston large rod 3 in an axial moving mode, a piston rod cavity II 5 is formed between the piston head of the piston middle rod 2 and the piston large rod 3, and the process that the piston head of the piston middle rod 2 compresses the piston rod cavity II 5 when the piston middle rod 2 moves axially is defined as a second stroke of the jack;
the large piston rod 3 is arranged in the cylinder cavity 6 in an axial movement mode, and a third stroke of the jack is formed by the process that the piston head of the large piston rod 3 compresses the cylinder cavity 6 when the large piston rod moves axially;
the piston head on the piston middle rod 2 is provided with a first oil drainage hole 7, the piston head on the piston large rod 3 is provided with a second oil drainage hole 8, and a third oil drainage hole 9 is formed in a communicated oil way between the cylinder cavity 6 and the outer sleeve cavity 10, so that the first stroke, the second stroke and the third stroke of the jack have the same descending speed in a load state.
By definition, the "axial direction" is the direction of the common central axis of the large piston rod 3, the middle piston rod 2, the small piston rod 1 and the cylinder chamber 6.
The specific working principle is as follows:
when the jack is loaded, because the internal pressure of hydraulic oil in the piston cylinder cavity I, the piston rod cavity II 5 and the cylinder cavity 6 is larger, other loops of the piston rod cavity I4, the piston rod cavity II 5 and the cylinder cavity 6 are blocked, only the oil drainage hole I7, the oil drainage hole II 8 and the oil drainage hole III 9 are communicated, namely, hydraulic oil in the piston rod cavity I4 can only enter the piston rod cavity II 5 through the oil drainage hole I7, hydraulic oil in the piston rod cavity II 5 can only enter the cylinder cavity 6 through the oil drainage hole II 8, and hydraulic oil in the cylinder cavity 6 enters the outer sleeve cavity 10 through the oil drainage hole III 9, all strokes of the jack have consistent descending speed.
Example 2
In order to avoid the jack failure or instability, the oil drain hole is designed to be a small hole structure to play a similar damping role, so that the multi-section piston rod can slowly descend under load. Meanwhile, in order to realize uniform descending, the cross sectional areas of the cavities of the oil drain hole are limited, the cross sectional area of the first oil drain hole 7 is S1, the cross sectional area of the first piston rod cavity 4 is S11, and the ratio of S11 to S1 is A1; defining the cross-sectional area of the oil drain hole I7 as S2, the cross-sectional area of the piston rod cavity I4 as S22, and the ratio of S22 to S2 as A2; the cross section area of the oil drain hole III 9 is defined as S3, the cross section area of the oil cylinder cavity 6 is defined as S33, and the ratio of S33 to S3 is defined as A3; wherein, A1: a2: a3 ═ 1: (1.8-2.1): (3.8-4.2).
Preferred are a 1: a2: a3 ═ 1: 2: 4 to allow it to be applied to the jack under the respective pressures of use.
It has the following effects: the sizes of the first oil drain hole 7, the second oil drain hole 8 and the third oil drain hole 9 are designed, and one of the oil drain holes ensures that hydraulic oil in all cavities can be communicated under load; and under no load, hydraulic oil can be uniformly distributed to each cavity through the first oil drainage hole 7, the second oil drainage hole 8 and the third oil drainage hole 9.
Example 3
In order to realize that each level of piston rod can quickly rise back under no load, a piston head on the piston middle rod 2 is provided with an oil return valve I11; the piston head on the piston large rod 3 is provided with a second oil return valve 12.
As shown in fig. 2, the first oil return valve 11 includes:
the first valve body is provided with a through hole combination for communicating the first piston rod cavity 4 with the second piston rod cavity 5; the through hole combination comprises a ball mounting hole and a spring mounting hole which are coaxially arranged in sequence; the first spring mounting hole is communicated with the second piston rod cavity 5, the first ball mounting hole is communicated with the first piston rod cavity 4, and the diameter of the first ball mounting hole is larger than the maximum diameter of the first spring mounting hole;
the first ball is arranged in the first ball mounting hole and is blocked in the first spring mounting hole under the action of positive oil pressure difference between the first piston rod cavity 4 and the second piston rod cavity 5; meanwhile, the first ball can move axially along the combination of the through holes under the action of negative oil pressure difference between the first piston rod cavity 4 and the second piston rod cavity 5 so as to remove the blockage of the first spring mounting hole;
one end of the first spring is fixed in the first spring mounting hole, and the other end of the first spring applies force to the first ball, so that the first ball is suspended on the first spring mounting hole when the first piston rod cavity 4 and the second piston rod cavity 5 do not have oil pressure difference.
In this embodiment, the first spring mounting hole is adjacent to the second piston rod cavity 5, and a step surface is arranged in the first spring mounting hole to fix the first spring. The step surface can be realized by arranging a flange structure in a spring-mounting hole, namely the spring is mounted on the flange.
Or the step surface is realized by the following method: as shown in fig. 1-2, the first spring mounting hole has a second-step surface, the first step surface is used for mounting a first ball (i.e. the first step surface is formed by a difference in aperture between the first ball mounting hole and the first spring mounting hole), and the first spring is arranged on the second step surface, i.e. the first spring mounting hole has a step surface, and extends to the first step surface, so that the first ball is suspended above the first spring mounting hole in a conventional state (without oil pressure difference), i.e. the first piston rod cavity 4 is communicated with the second piston rod cavity 5; in the load state of the jack (the pressure difference is formed between the first piston rod cavity 4 and the second piston rod cavity 5), the oil pressure enables the first ball to overcome the acting force of the first spring to block the joint of the first ball mounting hole and the first spring mounting hole, namely the first step surface (the first step surface is formed between the first ball mounting hole and the first spring mounting hole because the size of the first ball mounting hole is larger than that of the first spring mounting hole).
In order to better understand the step surface of the first spring mounting hole and facilitate processing, the first spring mounting hole is divided into a large hole and a small hole, wherein the diameter of the large hole is between that of the first ball mounting hole and that of the small hole, and meanwhile, the large hole is communicated with the small hole and the first ball mounting hole; a first step surface is formed between the first ball mounting hole and the large hole; a step surface (a second step surface) of the spring mounting hole is formed between the large hole and the small hole; meanwhile, the diameter of the first ball is larger than that of the large hole, so that the first ball can block the large hole.
The piston head on the piston middle rod 2 is provided with a second oil return valve 12. As shown in fig. 3, the second oil return valve 12 includes:
the valve body is provided with a through hole combination for communicating the piston rod cavity II 5 with the oil cylinder cavity 6; the through hole combination comprises a second spring mounting hole and a second ball mounting hole which are coaxially arranged in sequence; the mounting hole of the second spring is communicated with the oil cylinder cavity 6, the mounting hole of the second ball is communicated with the second piston rod cavity 5, and the diameter of the mounting hole of the second ball is larger than the maximum diameter of the mounting hole of the second spring;
the second ball is arranged in the second ball mounting hole and is blocked in the second spring mounting hole under the action of the positive oil pressure difference between the second piston rod cavity 5 and the oil cylinder cavity 6; meanwhile, the second ball can move axially along the combination of the through holes under the action of the negative oil pressure difference between the second piston rod cavity 5 and the oil cylinder cavity 6 so as to remove the blockage of the second spring mounting hole;
one end of the second spring is fixed in the second spring mounting hole, and the other end of the second spring applies force to the second ball so that the second ball is suspended on the second spring mounting hole when the second piston rod cavity 5 and the cylinder cavity 6 do not have oil pressure difference.
As the improved technical scheme of the application, the second spring mounting hole is adjacent to the oil cylinder cavity 6, and a step surface is arranged on the second spring mounting hole to fix the second spring.
For convenience of processing and maintenance, the first oil return valve 11 and the second oil return valve 12 have the same structure, and even can have the same size and model.
The working principle is as follows:
when the piston rod assembly is restored to the standby state, the oil pressure of the outer sleeve cavity 10 is greater than that of the oil cylinder cavity 6, and when positive pressure difference exists between the oil cylinder cavity 6 and the second piston rod cavity 5 by applying pressure to the outer sleeve cavity 10, the oil pressure can gradually push open the plugs of the two ball-to-spring mounting holes (namely, the connection between the second piston rod cavity 5 and the oil cylinder cavity 6 is realized); when a positive pressure difference exists between the piston rod cavity II 5 and the piston rod cavity I4, the ball I removes the blockage of the spring I mounting hole (namely, the communication between the piston rod cavity I4 and the piston rod cavity II 5 is realized); the first ball removes the blockage of the first spring mounting hole (namely, the first piston rod cavity 4 is communicated with the second piston rod cavity 5); and part of hydraulic oil enters the second piston rod cavity 5 through the second oil drainage hole 8 and enters the first piston rod cavity 4 through the first oil drainage hole 7, so that quick oil return of the jack in an idle state is realized.
Example 4
The difference from the previous embodiment is that in order to ensure the oil pressure in each piston rod cavity and the oil cylinder cavity 6, the end of the piston small rod 1 which slides along the inner wall of the piston middle rod 2 to compress the piston rod cavity I4 is provided with an oil seal I at the periphery; the piston middle rod 2 slides along the inner wall of the piston large rod 3 to compress the end of the piston rod cavity II 5, and an oil seal II is arranged at the periphery; the piston large rod 3 moves along the inner wall of the oil cylinder cavity 6 to compress the end of the oil cylinder cavity 6, and the periphery of the piston large rod is provided with an oil seal III.
In order to ensure the use safety and stability of the jack, the small piston rod 1 slides along the inner wall of the middle piston rod 2 to compress the end of the first piston rod cavity 4, and an oil seal I is arranged at the periphery of the end;
the piston middle rod 2 slides along the inner wall of the piston large rod 3 to compress the end of the piston rod cavity II 5, and an oil seal II is arranged at the periphery; of course, the other end of the piston middle rod 2 can be provided with a second end oil seal within the moving range of the piston small rod 1.
The piston large rod 3 moves along the inner wall of the oil cylinder cavity 6 to compress the end of the oil cylinder cavity 6 and is provided with a third oil seal at the periphery; of course, a first end oil seal can be arranged at the other end of the piston large rod 3 and in the moving range of the piston middle rod 2.
Example 5
In order to realize the quick entry of the hydraulic oil in the cylinder cavity 6 into the outer sleeve cavity 10, the oil jack further comprises an oil return valve assembly 13.
As shown in fig. 4, the spill valve assembly 13 includes:
the oil return valve body is provided with a third oil drainage hole 9;
the oil return valve core is arranged in the oil return valve body and comprises a ball thirteen 18 and a spring thirteen 17, and the spring thirteen 17 is used for supporting the ball thirteen 18 to plug the oil drain hole three 9;
the thimble assembly is arranged in the oil return valve body and comprises a thimble spring 16 and an oil return valve thimble 15, and the thimble spring 16 is used for supporting the bottom of the oil return valve thimble 15 so that the oil return valve thimble 15 is positioned above the thirteen balls 18; the top of the oil return valve thimble 15 is connected with an external force application part, and under the action of a downward external force, the oil return valve thimble 15 can press the ball thirteen 18 downwards so as to remove the blockage of the oil drain hole three 9 by the ball thirteen 18.
The external force application member in this embodiment may be a snap-on, or any structure known in the art that is capable of applying a downward force to the spill valve needle 15.
The structure specially designed in the application can also be adopted, such as a pedal 14 assembly, which is used for applying acting force to the oil return valve thimble 15; the pedal 14 assembly comprises a connecting rod and a pedal 14; one end of the connecting rod is rotatably mounted on the outer wall of the outer sleeve cavity 10, and the end head of the other end of the connecting rod is fixed with a pedal 14; meanwhile, a section of the connecting rod close to the outer sleeve cavity 10 is fixedly connected to an oil return valve ejector pin 15, the pedal 14 can drive the oil return valve ejector pin 15 to move up and down when moving up and down, a ball thirteen 18 is positioned on a path of the oil return valve ejector pin 15 moving up and down, and when the ejector pin displaces, the ejector pin can act on the ball thirteen 18 to displace the ball thirteen 18; namely, when the pedal 14 applies downward acting force, the acting force of the thimble spring 16 is overcome, the oil return valve thimble 15 jacks a thirteen ball 18, and the oil drain hole III 9 is opened, so that the oil cylinder cavity 6 is communicated with the outer sleeve cavity 10, and hydraulic oil in the oil cylinder cavity 6 is quickly transmitted to the outer sleeve cavity 10; meanwhile, the oil return valve assembly 13, the first pump and the second pump can act together and act singly to achieve quick oil return, and the three are all operated mechanically, so that the portability and the rapidness of operation are guaranteed.
The technical effects that it can reach are: the combined valve is adopted to replace a single valve, so that the oil path structure is effectively simplified, and the production cost of the jack base is reduced. Each valve core in the combined valve can be integrally processed, the valve core precision can be higher through material selection, the quality is more stable, and the combined valve is convenient to maintain and low in cost. Meanwhile, each valve body in the combined valve is matched with the ball body through the spring, so that the combined valve is simple in structure, strong in replaceability and simple in operation process; the jack can return oil quickly when no load exists, and the performance is stable when the jack is loaded.
The above description is only for the embodiments of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several changes and modifications can be made, which all fall within the scope of the present invention.
Claims (10)
1. A vertical jack comprises an outer sleeve cavity and an oil cylinder cavity, wherein the outer sleeve cavity and the oil cylinder cavity can be communicated through an external oil path to realize oil return; the method is characterized in that: the piston is characterized by also comprising a small piston rod, a middle piston rod and a large piston rod, wherein the small piston rod, the middle piston rod and the large piston rod are respectively provided with a piston head at one end;
the piston small rod is nested in the piston middle rod in an axial movement mode, a first piston rod cavity is formed between the piston head of the piston small rod and the piston middle rod, and the process that the piston head compresses the first piston rod cavity when the piston small rod moves axially is defined as the first stroke of the jack;
the piston middle rod is nested in the piston large rod in an axial moving mode, a piston rod cavity II is formed between the piston head of the piston middle rod and the piston large rod, and the process that the piston head of the piston middle rod compresses the piston rod cavity II when the piston middle rod moves axially is defined as a second stroke of the jack;
the large piston rod is arranged in the oil cylinder cavity in an axial movement mode, and the third stroke of the jack is formed by the process that the piston head of the large piston rod compresses the oil cylinder cavity when the large piston rod moves axially;
the oil drain hole III is formed in a communicated oil way between the oil cylinder cavity and the outer sleeve cavity, so that the first stroke, the second stroke and the third stroke of the jack in a load state have the same descending speed.
2. A jack as claimed in claim 1 wherein the cross-sectional area of the first oil release opening is defined as S1, the cross-sectional area of the first piston rod cavity is defined as S11, and the ratio of S11 to S1 is defined as a 1; defining the cross-sectional area of the oil drain hole I as S2, the cross-sectional area of the piston rod cavity I as S22, and the ratio of S22 to S2 as A2; defining the cross section area of the oil drain hole as S3, the cross section area of the oil cylinder cavity as S33, and the ratio of S33 to S3 as A3; wherein, A1: a2: a3 ═ 1: (1.8-2.1): (3.8-4.2).
3. The vertical jack of claim 1, wherein the piston head on the piston center rod is provided with a first oil return valve.
4. A vertical jack as claimed in claim 3, wherein said first return valve comprises:
the first valve body is provided with a through hole combination communicated with the first piston rod cavity and the second piston rod cavity; the through hole combination comprises a ball mounting hole and a spring mounting hole which are coaxially arranged in sequence; the first spring mounting hole is communicated with the second piston rod cavity, the first ball mounting hole is communicated with the first piston rod cavity, and the diameter of the first ball mounting hole is larger than the maximum diameter of the first spring mounting hole;
the first ball is arranged in the first ball mounting hole and is blocked in the first spring mounting hole under the action of positive oil pressure difference between the first piston rod cavity and the second piston rod cavity; meanwhile, the first ball can move axially along the combination of the through holes under the action of negative oil pressure difference between the first piston rod cavity and the second piston rod cavity so as to remove the blockage of the first spring mounting hole;
one end of the first spring is fixed in the first spring mounting hole, and the other end of the first spring applies force to the first ball, so that the first ball is suspended on the first spring mounting hole when the first piston rod cavity and the second piston rod cavity have no oil pressure difference.
5. The vertical jack of claim 4, wherein the first spring mounting hole is adjacent to the second piston rod cavity, and a step surface is provided in the first spring mounting hole to fix the first spring.
6. The vertical jack of claim 1, wherein the piston head on the piston rod is provided with a second oil return valve.
7. The vertical jack of claim 6, wherein the second oil return valve comprises:
the valve body is provided with a through hole combination for communicating the piston rod cavity II with the oil cylinder cavity; the through hole combination comprises a second spring mounting hole and a second ball mounting hole which are coaxially arranged in sequence; the mounting hole of the second spring is communicated with the oil cylinder cavity, the mounting hole of the second ball is communicated with the second piston rod cavity, and the diameter of the mounting hole of the second ball is larger than the maximum diameter of the mounting hole of the second spring;
the second ball is arranged in the second ball mounting hole and is blocked in the second spring mounting hole under the action of the positive oil pressure difference between the second piston rod cavity and the oil cylinder cavity; meanwhile, the second ball can move axially along the combination of the through holes under the action of the negative oil pressure difference between the second piston rod cavity and the cylinder cavity so as to remove the blockage of the second spring mounting hole;
one end of the second spring is fixed in the second spring mounting hole, and the other end of the second spring applies force to the second ball so that the second ball is suspended on the second spring mounting hole when the second piston rod cavity and the oil cylinder cavity are free of oil pressure difference.
8. The vertical jack of claim 7, wherein the second spring mounting hole is adjacent to the cylinder chamber, and the second spring mounting hole is provided with a step surface for fixing the second spring.
9. The vertical jack according to claim 1, wherein the piston small rod is provided with a first oil seal at the periphery at the end of the piston small rod sliding along the inner wall of the piston middle rod to compress the piston rod cavity one;
the piston middle rod slides along the inner wall of the piston large rod to compress the end of the piston rod cavity II, and an oil seal II is arranged on the periphery of the end of the piston rod cavity II;
the piston large rod moves along the inner wall of the oil cylinder cavity to compress the end of the oil cylinder cavity, and the periphery of the piston large rod is provided with an oil seal III.
10. The vertical jack of claim 1, further comprising an oil return valve assembly disposed in an oil path communicating between the outer casing cavity and the cylinder cavity;
the oil return valve assembly comprises a valve body,
the oil return valve body is provided with an oil drainage hole III;
the oil return valve core is arranged in the oil return valve body and comprises a ball thirteen and a spring thirteen, and the spring thirteen is used for supporting the ball thirteen to plug the oil drain hole three;
the thimble assembly is arranged in the oil return valve body and comprises a thimble spring and an oil return valve thimble, and the thimble spring is used for supporting the bottom of the oil return valve thimble so that the oil return valve thimble is positioned above the thirteen balls; the top of the oil return valve thimble is connected with an external force application part, and the oil return valve thimble can press the ball thirteen under the action of downward external force so as to realize the removal of the blockage of the oil drain hole III by the ball thirteen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922251498.XU CN211895855U (en) | 2019-12-16 | 2019-12-16 | Vertical jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922251498.XU CN211895855U (en) | 2019-12-16 | 2019-12-16 | Vertical jack |
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| Publication Number | Publication Date |
|---|---|
| CN211895855U true CN211895855U (en) | 2020-11-10 |
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| CN201922251498.XU Active CN211895855U (en) | 2019-12-16 | 2019-12-16 | Vertical jack |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110902597A (en) * | 2019-12-16 | 2020-03-24 | 常熟通润汽车零部件股份有限公司 | Vertical jack |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110902597A (en) * | 2019-12-16 | 2020-03-24 | 常熟通润汽车零部件股份有限公司 | Vertical jack |
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