CN213775896U

CN213775896U - Hydraulic cylinder, double-cylinder pumping system and concrete pump truck

Info

Publication number: CN213775896U
Application number: CN202022614471.5U
Authority: CN
Inventors: 汪波; 苏耀; 吴丽平
Original assignee: HUNAN TELI HYDRAULIC CO Ltd; Zoomlion Heavy Industry Science and Technology Co Ltd
Current assignee: HUNAN TELI HYDRAULIC CO Ltd; Zoomlion Heavy Industry Science and Technology Co Ltd
Priority date: 2020-11-12
Filing date: 2020-11-12
Publication date: 2021-07-23
Anticipated expiration: 2030-11-12

Abstract

The utility model relates to an engineering machine tool discloses a pneumatic cylinder, twin-cylinder pumping system and mobile concrete pump. The cylinder body piston of the hydraulic cylinder divides the inner cavity space of the cylinder body into a rod cavity and a rodless cavity, a floating piston capable of performing reciprocating motion in the rodless cavity is arranged in the rodless cavity, and a gas storage cavity is formed between the floating piston and the closed end of the cylinder body. The utility model also provides a double-cylinder pumping system including above-mentioned pneumatic cylinder and concrete pump truck including above-mentioned double-cylinder pumping system. The utility model provides a pneumatic cylinder can reduce the impact of cylinder body piston to the cylinder body and carry out the potential energy at the stroke end and store, realizes the quick switching-over of pneumatic cylinder.

Description

Hydraulic cylinder, double-cylinder pumping system and concrete pump truck

Technical Field

The utility model relates to an engineering machine tool specifically, relates to a pneumatic cylinder, twin-cylinder pumping system and mobile concrete pump.

Background

At present, a concrete pumping system usually adopts a double-cylinder pumping device, namely two hydraulic cylinders work in a coordinated mode, when one hydraulic cylinder extends outwards, the other hydraulic cylinder retracts, and the two hydraulic cylinders work alternately to achieve continuous pumping construction of concrete sources. In order to realize continuous pumping of materials, the oil cylinder is required to be capable of quickly reversing, and because the pumping load is large, the impact force generated by reversing the oil cylinder is large, vibration can be generated, the energy consumption of the whole machine is increased, and the sealing durability of the system is poor. Therefore, the pumping mostly adopts the schemes of hydraulic control and electric control reversing at the tail end of the stroke of the oil cylinder, and the reversing power is derived from a hydraulic system.

The hydraulic cylinder hydraulic control buffering reversing structure mainly realizes buffering by arranging a one-way discharge device at the stroke tail end of the hydraulic cylinder so as to reduce the reversing impact at the hydraulic pumping stroke tail end; the electric control buffer reversing of the hydraulic cylinder is mainly characterized in that a proximity switch electric control reversing signal device is arranged at the tail end of the stroke of the hydraulic cylinder to control the oil supply amount of the hydraulic cylinder so as to reduce the reversing impact at the tail end of the stroke. Referring to fig. 1, although the conventional pumping cylinder considers that a buffer is arranged at the stroke end of the hydraulic cylinder to reduce the impact when the hydraulic cylinder is reversed, the problems of the impact at the stroke end of the hydraulic cylinder, the pressure loss when the hydraulic cylinder is reversed and the starting of quick reversing are not fundamentally solved.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that at first will solve provides a pneumatic cylinder, and this pneumatic cylinder can reduce at the stroke end and strike and carry out the potential energy and store, realizes the quick switching-over of pneumatic cylinder.

The utility model discloses a technical problem that further will solve provides a double-cylinder pumping system, and this double-cylinder pumping system can reduce the terminal impact of pneumatic cylinder stroke to realize the quick switching-over of pneumatic cylinder.

The utility model discloses the technical problem that will solve at last provides a concrete pump truck, and this concrete pump truck can carry out the quick switching-over of pneumatic cylinder for the continuous pumping effect of concrete is better.

In order to solve the technical problem, the utility model discloses the first aspect provides a pneumatic cylinder, and the cylinder body piston of this pneumatic cylinder divide into the inner chamber space of cylinder body has pole chamber and no pole chamber, no pole intracavity is provided with the floating piston that can carry out reciprocating motion in this no pole intracavity, floating piston with form the gas storage chamber between the blind end of cylinder body.

Preferably, a buffering push rod is arranged between the floating piston and the cylinder piston, and the buffering push rod is connected with the floating piston or the cylinder piston.

More preferably, a limiting block used for limiting the floating piston is arranged on the inner wall of the rodless cavity, the limiting block is located between the floating piston and the cylinder piston, and a push rod channel used for allowing the buffering push rod to penetrate is arranged on the limiting block.

Specifically, a first buffer loop and a second buffer loop are arranged on the cylinder body, the first buffer loop is arranged close to the opening end of the cylinder body, and the second buffer loop is arranged close to the closed end of the cylinder body and is positioned on the front side of the limiting block; the first buffer circuit and the second buffer circuit respectively comprise a front buffer port, a rear buffer port and a buffer liquid path, the front buffer port and the rear buffer port are arranged at intervals along the length direction of the cylinder body, the interval distance between the front buffer port and the rear buffer port is larger than the thickness of the piston of the cylinder body, one end of the buffer liquid path is connected with the front buffer port, the other end of the buffer liquid path is connected with the rear buffer port, and a one-way valve and a flow regulating valve are arranged on the buffer liquid path.

In a preferred structure, a limiting sleeve connected with the end plate is arranged on the outer side of the end plate at the opening end of the cylinder body, and the limiting sleeve is sleeved on the periphery of a piston rod of the cylinder piston.

Preferably, the cylinder body is connected with a liquid supplementing pipeline.

Specifically, the gas storage cavity is connected with a gas regulating device.

A second aspect of the present invention provides a dual cylinder pumping system, comprising the above-mentioned hydraulic cylinder.

Preferably, the number of the hydraulic cylinders is two, a connecting pipe is connected between the rodless cavities of the two hydraulic cylinders, and the rod cavities are respectively connected to the working oil way.

The third aspect of the utility model provides a concrete pump truck, including foretell double-cylinder pumping system.

Through the technical scheme, the beneficial effects of the utility model are that:

the utility model discloses an among the basic technical scheme, the pneumatic cylinder utilizes and forms the gas storage chamber between the blind end of floating piston and cylinder body, can form gas spring energy storage structure at the stroke end of pneumatic cylinder behind the gas storage intracavity gas filling, striking floating piston when cylinder body piston motion to stroke end, gas in the gas storage chamber can provide the cushion effect for the cylinder body piston, reduce the impact of cylinder body piston to the cylinder body, can also store the partial potential energy of cylinder body piston simultaneously, in order to provide certain auxiliary external force when the cylinder body piston commutates, in order to realize the quick switching-over of pneumatic cylinder.

In the preferred embodiment of the utility model, a buffer push rod is arranged between the floating piston and the cylinder piston, so that the gas storage cavity can buffer the cylinder piston more timely through the floating piston, and the buffer effect is better; be provided with on the inner wall of cylinder body and be used for carrying on spacing stopper to floating piston to can avoid floating piston's setting to the interference of cylinder body piston, can keep the gas pressure in the gas storage chamber in certain within range simultaneously, in order to exert its buffering energy storage's effect better.

Other features and advantages of the present invention will be described in detail in the detailed description which follows.

Drawings

FIG. 1 is a schematic diagram of a prior art hydraulic cylinder;

FIG. 2 is a schematic structural view of an embodiment of the hydraulic cylinder of the present invention;

fig. 3 is a schematic structural diagram of an embodiment of the middle two-cylinder pumping system of the present invention.

Description of the reference numerals

1 cylinder 11 end plate

12 rod cavity and 13 rodless cavity

14 first buffer circuit of limiting block 15

16 second buffer circuit 2 cylinder piston

3 piston rod 4 buffering push rod

5 floating piston 6 gas storage cavity

7 fluid infusion pipeline 8 connecting pipe

9 position limiting sleeve

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "connected," "mounted," and "disposed" are to be construed broadly, e.g., the connection may be a fixed connection, a detachable connection, or an integral connection; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

It should be noted that, in the following description, directional words such as "front", "rear", "upper", "lower", etc. are used for clearly explaining the technical solution of the present invention, and "front" refers to the open end of the cylinder body 1, "rear" refers to the closed end of the cylinder body 1, "upper" refers to the upper side along the front-rear direction of the cylinder body 1, and "lower" refers to the lower side along the front-rear direction of the cylinder body 1. The terminology used is for the purpose of describing the invention only and is for the purpose of simplifying the description based on the directions or positional relationships illustrated in the drawings, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, and therefore the features defined "first", "second" may explicitly or implicitly include one or more of the features described.

The utility model discloses the pneumatic cylinder that the first aspect provided, see fig. 2, the cylinder body piston 2 of this pneumatic cylinder divide into the inner chamber space of cylinder body 1 has pole chamber 12 and no pole chamber 13, is provided with the floating piston 5 that can carry out reciprocating motion in this no pole chamber 13 in the no pole chamber 13, forms gas storage chamber 6 between the blind end of floating piston 5 and cylinder body 1.

It should be noted that, a cylinder piston 2 of the hydraulic cylinder is provided with a piston rod 3, one end of the piston rod 3, which is far away from the cylinder piston 2, extends out from an opening end of the cylinder 1, one side of the cylinder 1, which is provided with the piston rod 3, is a rod cavity 12, one side of the cylinder 1, which is not provided with the piston rod 3, is a rod-free cavity 13, and the front side and the rear side of the cylinder 1 are respectively connected with a working oil path.

In the utility model, in order to ensure the air tightness of the air storage cavity 6, the periphery of the floating piston 5 can be provided with a sealing structure; in order to adjust or maintain the gas pressure in the gas storage cavity 6, preferably, the gas storage cavity 6 is configured to be connected to a gas adjusting device, and specifically, the gas adjusting device includes a gas pipe connected to the gas storage cavity 6, a gas control valve disposed on the gas pipe, and a gas supply device connected to the gas pipe, so as to adjust the gas pressure in the gas storage cavity 6 by opening or closing the gas control valve. In addition, the gas filled in the gas storage cavity 6 is generally inert gas so as to improve the safety of the hydraulic cylinder in the using process.

The utility model discloses the pneumatic cylinder that above-mentioned basic scheme provided, at the during operation, fill inert gas in the gas storage chamber 6 in advance, make certain atmospheric pressure in the gas storage chamber 6, oil feed in to having pole chamber 12 through the working oil route, make cylinder body piston 2 move to the blind end of cylinder body 1, the piston rod 3 contracts back, hydraulic oil in the rodless chamber 13 discharges from the working oil circuit simultaneously, when cylinder body piston 2 moved to the stroke end, cylinder body piston 2 collides with floating piston 5, make floating piston 5 move to the blind end of cylinder body 1, compress the gas in the gas storage chamber 6, produce the buffering effect to cylinder body piston 2, absorb the potential energy that the cylinder contracts back simultaneously, realize the quick braking to cylinder body piston 2, until gas storage chamber 6 prevents that cylinder body piston 2 continues to the blind end motion of cylinder body 1 or cylinder body piston 2 moves to its limit position department; at the moment, the gas storage cavity 6 absorbs and stores most of the cylinder retraction potential energy, the working oil path feeds oil into the rodless cavity 13, so that the cylinder body piston 2 moves towards the opening end of the cylinder body 1, namely the piston rod 3 extends in a reversing way, and meanwhile, the gas storage cavity 6 releases the cylinder retraction potential energy absorbed by the cylinder body piston to provide auxiliary power for reversing the cylinder body piston 2, and the quick reversing of the cylinder body piston 2 at the stroke tail end is realized.

As an optimal implementation mode of the utility model, be provided with buffering push rod 4 between floating piston 5 and the cylinder body piston 2, buffering push rod 4 sets up to be connected with floating piston 5 or cylinder body piston 2, can make gas storage chamber 6 more timely to the cushioning effect of cylinder body piston 2 through floating piston 5, and the buffering effect is better, can further reduce the impact force of cylinder body piston 2 to the cylinder body, reduces the vibration that the impact produced.

In order to maintain the air pressure in the air storage chamber 6 at a certain pressure, a sealing structure between the floating piston 5 and the inner wall of the cylinder 1 may be used to generate a corresponding resistance force to reduce the displacement of the floating piston 5 with the increase of the pressure in the air storage chamber 6. As an optimal implementation mode of the utility model, be provided with on the inner wall in rodless chamber 13 and be used for carrying out spacing stopper 14 to floating piston 5, stopper 14 is located between floating piston 5 and cylinder body piston 2, is provided with the push rod passageway that is used for supplying buffering push rod 4 to pass on the stopper 14. The movement space of the floating piston 5 and the cylinder piston 2 is separated by the arrangement of the limiting block 14, so that the stroke interference of the floating piston 5 on the cylinder piston 2 can be avoided, and meanwhile, the gas pressure in the gas storage cavity 6 can be kept in a certain range, so that the buffering and energy storage functions of the gas storage cavity can be better played.

When being applied to pumping system, the pneumatic cylinder need be used in the end cooperation conveying cylinder that stretches out of piston rod 3 usually, as the utility model discloses an optimal implementation mode, the outside of the end plate 11 of 1 open end of cylinder body is provided with the stop collar 9 of being connected with this end plate 11, 9 covers of stop collar are established in the periphery of the piston rod 3 of cylinder body piston 2, correspondingly piston rod 3 or the link of carrying jar and piston rod 3 are provided with the contact piece corresponding with stop collar 9, so that contact piece move to the back of being contacted with stop collar 9, piston rod 3 stops to retract, thereby realize carrying out corresponding limiting displacement to cylinder body piston 2 at the stroke end, avoid cylinder body piston 2's the too big cylinder body 1 or gas storage chamber 6 production damage of impact force. Preferably, the position limiting sleeve 9 is detachably connected with the end plate 11, so that the position limiting sleeve 9 is conveniently detached, and the floating piston 5 and the cylinder piston 2 are replaced from the opening end of the cylinder 1.

On the basis that the gas storage cavity 6 generates a buffering effect on the cylinder piston 2, as a preferred embodiment of the present invention, the cylinder 1 is provided with a first buffer circuit 15 and a second buffer circuit 16, the first buffer circuit 15 is disposed close to the open end of the cylinder 1, and the second buffer circuit 16 is disposed close to the closed end of the cylinder 1 and located in front of the limiting block 14; first buffer circuit 15 and second buffer circuit 16 respectively include preceding buffer port, back buffer port and buffer liquid way, and preceding buffer port and back buffer port set up along the length direction interval of cylinder body 1, and the spacing distance of preceding buffer port and back buffer port is greater than the thickness of cylinder body piston 2, and the one end and the preceding buffer port in buffer liquid way are connected, the other end is connected with back buffer port, are equipped with check valve and flow control valve on the buffer liquid way. Wherein, the check valve of the first buffer circuit 15 is set to face the front buffer port, and the check valve of the second buffer circuit 16 is set to face the rear buffer port; when the rod cavity 12 is filled with oil, the cylinder piston 2 moves to the closed end of the cylinder body 1 to a position between the front buffer port and the rear buffer port of the second buffer loop 16, the one-way valve of the second buffer loop 16 is opened, so that the rod cavity 12 and the rodless cavity 13 are communicated with the buffer liquid path through the front buffer port and the rear buffer port of the second buffer loop 16, hydraulic oil in the rod cavity 12 flows into the rodless cavity 13 through the one-way valve, the pressure difference between the rod cavity 12 and the rodless cavity 13 is reduced, and a buffer effect is further formed at the stroke end of the cylinder piston 2, so that the impact effect of the cylinder piston 2 on the floating piston 5 and the cylinder body 1 is reduced; accordingly, when oil is fed into the rodless chamber 13, the cylinder piston 2 moves toward the open end of the cylinder, and when the cylinder piston moves between the front buffer port and the rear buffer port of the first buffer circuit 15, the check valve of the first buffer circuit 15 opens, and hydraulic oil in the rodless chamber 13 flows into the rod chamber 12 through the check valve, so that a buffering effect is exerted on the cylinder piston 2.

The pneumatic cylinder can have certain hydraulic oil loss in the course of the work, for example, when the oil feed in the rodless chamber 13, the check valve of first buffer circuit 15 is opened for some hydraulic oil in rodless chamber 13 has the pole chamber 12 through the check valve inflow, finally can get into the working oil circuit, consequently, as the utility model discloses a preferred embodiment, cylinder body 1 is connected with fluid infusion pipeline 7 to can in good time make up hydraulic oil in 1 to the cylinder body.

On the basis of above-mentioned pneumatic cylinder, the utility model discloses the second aspect provides a double-cylinder pumping system, including the pneumatic cylinder that any one kind of above-mentioned scheme provided.

As the utility model discloses a well double-cylinder pumping system's a preferred embodiment, the pneumatic cylinder sets up to two, is connected with connecting pipe 8 between the rodless chamber 13 of two pneumatic cylinders, has pole chamber 12 to connect respectively in the working oil circuit. When one of the two hydraulic cylinders extends outwards, the other one retracts, the two hydraulic cylinders work alternately to realize an uninterrupted pumping process, when the cylinder piston 2 of the hydraulic cylinder moves to the tail end of the stroke, the floating piston 5 and the air storage cavity 6 are arranged to form an effective buffering effect on the cylinder piston 2, the reversing of the cylinder piston 2 is faster, and the pumping connection effect of the two hydraulic cylinders is better.

As a relatively preferred embodiment of the middle double-cylinder pumping system of the present invention, referring to fig. 3, the double-cylinder pumping system comprises a first hydraulic cylinder a and a second hydraulic cylinder b, the first hydraulic cylinder a and the second hydraulic cylinder b are respectively configured as: the cylinder piston 2 divides the inner cavity space of the cylinder 1 into a rod cavity 12 and a rodless cavity 13, a floating piston 5 capable of reciprocating in the rodless cavity 13 is arranged in the rodless cavity 13, a gas storage cavity 6 is formed between the floating piston 5 and the closed end of the cylinder 1, the cylinder 1 is connected with a liquid supplementing pipeline 7, and the gas storage cavity 6 is connected with a gas regulating device; a connecting pipe 8 is connected between the rodless cavities 13 of the first hydraulic cylinder a and the second hydraulic cylinder b, and rod cavities 12 are respectively connected to the working oil way; a piston rod 3 is arranged on the cylinder piston 2, one end of the piston rod 3, which is far away from the cylinder piston 2, extends out from the opening end of the cylinder 1, one side of the cylinder piston 2, which faces the floating piston 5, is connected with a buffer push rod 4, a limit block 14 is arranged on the inner wall of the rodless cavity 13, the limit block 14 is positioned between the floating piston 5 and the cylinder piston 2, and a push rod channel for the buffer push rod 4 to pass through is arranged on the limit block 14; a limiting sleeve 9 connected with the end plate 11 is arranged on the outer side of the end plate 11 at the opening end of the cylinder body 1, the limiting sleeve 9 is sleeved on the periphery of the piston rod 3 of the cylinder body piston 2, and a contact block corresponding to the limiting sleeve 9 is arranged on one side, away from the cylinder body piston 2, of the piston rod 3; a first buffer circuit 15 and a second buffer circuit 16 are arranged on the cylinder body 1, the first buffer circuit 15 is arranged close to the opening end of the cylinder body 1, and the second buffer circuit 16 is arranged close to the closed end of the cylinder body 1 and is positioned on the front side of the limiting block 14; first buffer circuit 15 and second buffer circuit 16 respectively include preceding buffer port, back buffer port and buffer liquid way, and preceding buffer port and back buffer port set up along the length direction interval of cylinder body 1, and the spacing distance of preceding buffer port and back buffer port is greater than the thickness of cylinder body piston 2, and the one end and the preceding buffer port in buffer liquid way are connected, the other end is connected with back buffer port, are equipped with check valve and flow control valve on the buffer liquid way.

In the double-cylinder pumping system provided by the embodiment, when the double-cylinder pumping system works, the gas storage cavities 6 of the first hydraulic cylinder a and the second hydraulic cylinder b are pre-filled with inert gas through the gas regulating device, so that a certain gas pressure is provided in the gas storage cavities 6;

firstly, the oil is fed into the rod cavity 12 of the first hydraulic cylinder a through the working oil path, and at the moment, the working process of the first hydraulic cylinder a is as follows: the cylinder piston 2 moves towards the closed end of the cylinder body 1, the piston rod 3 retracts, meanwhile, hydraulic oil in the rodless cavity 13 is discharged into the rodless cavity 13 of the second hydraulic cylinder b from the connecting pipe 8, when the cylinder piston 2 moves to be close to the stroke end, the buffering push rod 4 penetrates through the push rod channel to collide with the floating piston 5, so that the floating piston 5 moves towards the closed end of the cylinder body 1, gas in the gas storage cavity 6 is compressed, a buffering effect is generated on the cylinder piston 2, the potential energy of the cylinder piston 2 is absorbed at the same time, and the cylinder piston 2 is rapidly braked, when the cylinder piston 2 moves to be between a front buffering port and a rear buffering port of the second buffering loop 16, the one-way valve of the second buffering loop 16 is opened, so that the hydraulic oil in the rod cavity 12 flows into the rodless cavity 13 through the one-way valve until a contact block on the piston rod 3 is in contact with the limiting sleeve 9; the working process of the second hydraulic cylinder b is as follows: hydraulic oil enters the rodless cavity 13 through the connecting pipe 8, the cylinder piston 2 is pushed to move towards the opening end of the cylinder 1, the hydraulic oil in the rod cavity 12 is discharged, the piston rod 3 extends outwards in a reversing manner, when the cylinder piston 2 moves to a position between the front buffer port and the rear buffer port of the first buffer circuit 15, the one-way valve of the first buffer circuit 15 is opened, and the hydraulic oil in the rodless cavity 13 flows into the rod cavity 12 through the one-way valve to buffer the cylinder piston 2;

then, stop to the interior oil feed of having the pole chamber 12 of first pneumatic cylinder a, have the pole chamber 12 of second pneumatic cylinder b to the oil feed through the working fluid way, at this moment, first pneumatic cylinder a's working process is: hydraulic oil enters a rodless cavity 13 through a connecting pipe 8, the cylinder piston 2 is pushed to move towards the opening end of the cylinder body 1, the hydraulic oil in the rod cavity 12 is discharged, meanwhile, the air storage cavity 6 releases cylinder retraction potential energy absorbed by the air storage cavity to provide auxiliary power for reversing the cylinder piston 2, rapid reversing of the cylinder piston 2 is achieved, when the cylinder piston 2 moves to a position between a front buffer opening and a rear buffer opening of a first buffer loop 15, a one-way valve of the first buffer loop 15 is opened, and the hydraulic oil in the rodless cavity 13 flows into the rod cavity 12 through the one-way valve to buffer the cylinder piston 2; the working process of the second hydraulic cylinder b is the same as that of the first hydraulic cylinder a when retracting;

the oil inlet process of the rod cavities 12 of the first hydraulic cylinder a and the second hydraulic cylinder b is repeated in sequence, so that the first hydraulic cylinder a and the second hydraulic cylinder b can pump continuously;

when the floating piston 5 and the cylinder body piston 2 of the hydraulic cylinder need to be replaced, only the limiting sleeve 9 needs to be detached, and after pressure is relieved in the air storage cavity 6, the piston rod 3 can retract in a full stroke manner, so that the floating piston 5 and the cylinder body piston 2 can be replaced quickly.

The third aspect of the utility model provides a concrete pump truck, including foretell double-cylinder pumping system. Therefore, the hydraulic cylinder and the double-cylinder pumping system have at least all the advantages brought by the technical scheme of the embodiment of the hydraulic cylinder and the double-cylinder pumping system.

As can be seen from the above description, the utility model discloses a pneumatic cylinder utilizes and forms gas storage chamber 6 between the blind end of floating piston 5 and cylinder body 1, can form gas spring energy storage structure at the stroke end of pneumatic cylinder after the gas is filled in gas storage chamber 6, striking floating piston 5 when cylinder body piston 2 moves to the stroke end, gas in the gas storage chamber 6 can provide the buffer power for cylinder body piston 2, reduce the impact of cylinder body piston 2 to cylinder body 1, can also store cylinder body piston 2's partial potential energy simultaneously, in order to provide certain supplementary external force when cylinder body piston 2 commutates, in order to realize the quick switching-over of pneumatic cylinder.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. In the technical idea scope of the present invention, it is possible to provide the technical solution of the present invention with a plurality of simple modifications, including combining each specific technical feature in any suitable manner, and in order to avoid unnecessary repetition, the present invention does not provide additional description for various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.

Claims

1. The hydraulic cylinder is characterized in that the inner cavity space of a cylinder body (1) is divided into a rod cavity (12) and a rodless cavity (13) by a cylinder body piston (2), a floating piston (5) capable of reciprocating in the rodless cavity (13) is arranged in the rodless cavity (13), and an air storage cavity (6) is formed between the floating piston (5) and the closed end of the cylinder body (1).

2. Hydraulic cylinder according to claim 1, characterized in that a buffer push rod (4) is arranged between the floating piston (5) and the cylinder piston (2), which buffer push rod (4) is arranged in connection with the floating piston (5) or the cylinder piston (2).

3. The hydraulic cylinder according to claim 2, characterized in that a limiting block (14) for limiting the floating piston (5) is arranged on the inner wall of the rodless cavity (13), the limiting block (14) is located between the floating piston (5) and the cylinder piston (2), and a push rod channel for the buffer push rod (4) to pass through is arranged on the limiting block (14).

4. The hydraulic cylinder according to claim 3, characterized in that a first cushion circuit (15) and a second cushion circuit (16) are arranged on the cylinder body (1), the first cushion circuit (15) is arranged close to the open end of the cylinder body (1), the second cushion circuit (16) is arranged close to the closed end of the cylinder body (1) and is positioned at the front side of the stopper (14);

the first buffer circuit (15) and the second buffer circuit (16) respectively comprise a front buffer port, a rear buffer port and a buffer liquid path, the front buffer port and the rear buffer port are arranged at intervals along the length direction of the cylinder body (1), the interval distance between the front buffer port and the rear buffer port is larger than the thickness of the cylinder body piston (2), one end of the buffer liquid path is connected with the front buffer port, the other end of the buffer liquid path is connected with the rear buffer port, and a one-way valve and a flow regulating valve are arranged on the buffer liquid path.

5. Hydraulic cylinder according to any one of claims 1 to 4, characterized in that the outer side of the end plate (11) at the open end of the cylinder body (1) is provided with a stop collar (9) connected with the end plate (11), and the stop collar (9) is sleeved on the outer periphery of the piston rod (3) of the cylinder piston (2).

6. Hydraulic cylinder according to any one of claims 1 to 4, characterized in that the cylinder block (1) is connected to a fluid replacement line (7).

7. Hydraulic cylinder according to any one of claims 1 to 4, characterized in that the gas reservoir (6) is connected to a gas regulating device.

8. A two-cylinder pumping system, characterized by comprising a hydraulic cylinder according to any one of claims 1 to 7.

9. The two-cylinder pumping system according to claim 8, characterized in that the hydraulic cylinders are provided in two, a connecting pipe (8) is connected between the rodless chambers (13) of the two hydraulic cylinders, and the rod chambers (12) are respectively connected to the working oil passages.

10. A concrete pump truck comprising the two-cylinder pumping system of claim 8 or 9.