CN115681258A - Energy-saving and efficiency-increasing linear driving cylinder and using method thereof - Google Patents

Abstract

The invention relates to an energy-saving and efficiency-increasing linear driving cylinder and a using method thereof, wherein the driving cylinder comprises a main cylinder body, a front cover and a rear cover; a main piston and a main piston rod are arranged in the main cylinder body; an auxiliary piston is also arranged in the main cylinder body and is positioned between the main piston and the rear cover; a quick propelling cavity is arranged along the auxiliary piston and/or the auxiliary piston rod; and a main pressure cavity is formed between the auxiliary piston and the main piston along the main cylinder body. When the driving cylinder is used, driving fluid is injected into the quick propelling cavity to realize quick extension, and driving fluid is injected into the main pressure cavity to realize main pressure output. The invention improves the internal structure of the linear driving cylinder and combines different driving fluid injection modes, thereby improving the running speed during idle work or low-power stroke and reducing the fluid consumption, thereby improving the running efficiency of equipment and reducing the power consumption of a driving fluid station.

Description

Energy-saving and efficiency-increasing linear driving cylinder and using method thereof

Technical Field

The invention relates to a hydraulic cylinder or air cylinder for linear driving and a using method thereof, which have the functions of energy saving and synergy and belong to the field of mechanical driving elements.

Background

In the field of mechanical equipment, hydraulic or pneumatic cylinders are often used to perform linear drives, which may be collectively referred to as linear drive cylinders. The main components of the linear driving cylinder comprise a cylinder body, a piston and a piston rod; a cylindrical piston is arranged in a cylindrical cylinder body, a piston rod is arranged on one side of the piston, the piston rod penetrates through a cylinder cover at the end part of the cylinder body, and the piston rod is exposed out of the cylinder body and serves as a linear driving element; hydraulic oil or air is injected into the cylinder body on one side of the piston to drive the piston to linearly move along the cylinder body, so that the piston rod is driven to linearly move.

Since the cylinder and the piston are both cylindrical and have fixed areas, the sectional area of the piston and the inner cavity of the cylinder needs to be increased to obtain larger driving force under the same driving pressure (the same driving oil pressure or the same driving air pressure), so that larger driving fluid amount (oil amount or air amount) is required.

In a gantry shear (refer to a gantry shear with the Chinese patent publication No. CN206509581U, a double-edge shearing gantry shear with the Chinese patent publication No. CN214264056U, and the like), a hydraulic packer (refer to a horizontal hydraulic full-automatic packer with the Chinese patent publication No. CN1765617A, a hydraulic packer with a mandril with the Chinese patent publication No. CN216659013U, and the like), even a press, and the like, a linear driving cylinder is adopted as a device of the linear driving element, in the pressurizing working process of the linear driving cylinder, the front very long stroke is a reactive or low-power stroke, and the last stroke is a stroke requiring large pressure.

Although the working stroke of large pressure is short, the mechanical equipment is limited by the structure of the existing linear driving cylinder, and only a large-power linear driving cylinder with a full-length large-size piston can be adopted; although most of the stroke of the linear drive cylinder does not generate a large driving pressure, which is required by the operating space of the equipment or the operating characteristics of the product, a large amount of driving fluid has to be injected to move the piston rod to the final working area.

When the work efficiency of the equipment needs to be improved, the flow rate of the driving fluid needs to be increased, the injection speed needs to be increased, the fluid output speed of a driving fluid station (a hydraulic station or a hollow pressure pump) needs to be increased, and the cost of the equipment is increased.

The problem which puzzles mechanical equipment research personnel who use linear driving cylinder product for a long time is along with market's demand increase to equipment operating efficiency promotion to and the demand increase to equipment energy consumption reduction, it is necessary to improve the structure of sharp cylinder body to both reduce the energy consumption, improve drive speed again, improve the operating efficiency of the equipment that linear driving cylinder belongs to.

Disclosure of Invention

The invention aims to provide an energy-saving and efficiency-increasing linear driving cylinder and a using method thereof, which can improve the running speed of the linear driving cylinder in a reactive or low-power stroke and reduce the fluid consumption, thereby improving the running efficiency of equipment and reducing the power consumption of a driving fluid station.

In order to achieve the above object, a first aspect of the present invention provides an energy-saving and efficiency-increasing linear driving cylinder, which comprises a main cylinder body, a front cover and a rear cover; a main piston and a main piston rod are arranged in the main cylinder body;

the main piston rod is positioned on the main piston, and the main piston rod penetrates through the front cover to extend out of the main cylinder body; the main piston and the main piston rod are positioned in the main cylinder body to form a piston type linear driving cylinder;

a return cavity is formed between the main piston and the front cover along the main cylinder body, and the return cavity is communicated with the outside through a return interface; the effective fluid pushing area of the return cavity is S3;

an auxiliary piston is further arranged in the main cylinder body and is positioned between the main piston and the rear cover;

the auxiliary piston is embedded in the main cylinder body and matched with the inner cavity of the main cylinder body;

an auxiliary piston rod is arranged on the auxiliary piston, penetrates through the rear cover and is partially positioned outside the main cylinder body;

the rapid propulsion cavity is connected with an external driving fluid station through a rapid propulsion interface;

the effective fluid propelling area of the rapid propelling cavity is S1;

a main pressure cavity is formed between the auxiliary piston and the main piston along the main cylinder body; the main pressure cavity is connected with an external driving fluid station through a main pressure fluid inlet;

the effective fluid pushing area of the main pressure chamber is S2;

S2>S1；S2>S3。

as a further improvement of the invention, the main pressure chamber moves along the inner cavity of the main cylinder body;

the main pressure fluid inlet is positioned in the main piston and the main piston rod or in the auxiliary piston and the auxiliary piston rod;

one end of the main pressure fluid inlet is communicated with the main pressure cavity through an opening on the main piston or the auxiliary piston;

the opening at the other end of the main pressure fluid inlet is positioned on the rod body or the end face of the main piston rod or the auxiliary piston rod outside the main cylinder body.

As a further development of the invention, the main pressure fluid inlet is located on the main cylinder;

when the main pressure cavity moves to the main pressure fluid inlet along the inner cavity of the main cylinder body, driving fluid can be injected into the main pressure cavity through the main pressure fluid inlet.

As a further improvement of the invention, a support is arranged between the auxiliary piston and the main piston; the drive chamber is always present between the secondary piston and the primary piston.

Furthermore, a recess is arranged on the end surface of the auxiliary piston or the main piston to form a reserved main pressure cavity;

a supporting body is formed at the periphery of the reserved main pressure cavity;

when the volume of the main pressure cavity is minimum, the supporting body on the periphery of the reserved main pressure cavity is abutted against the main piston or the auxiliary piston;

the area of the contact surface of the reserved main pressure cavity and the main piston is S4, and S4 is larger than or equal to S1.

In a second aspect of the present invention, there is provided a method for using an energy-saving and efficiency-increasing linear driving cylinder, wherein the main piston rod comprises 2 extension working modes:

the working mode I is a quick extension mode;

the quick propelling cavity is communicated with the driving fluid station through the quick propelling interface and is used for injecting driving fluid;

the return cavity is communicated with the fluid loop through the return interface or is opened;

the main pressure cavity is kept closed, or the size of the inner cavity is unchanged;

the space in the quick propelling cavity becomes larger along with the injection of the driving fluid, and the driving fluid finally pushes the auxiliary piston to move forwards along the main cylinder body; the auxiliary piston moves to push the main piston to synchronously move forwards so as to drive the main piston rod to extend out;

the extension speed of the main piston rod is V1, and the output thrust is F1;

a second working mode, a main pressure mode;

the quick propelling interface of the quick propelling cavity is kept closed, and fluid media in the quick propelling cavity are kept;

the return cavity is communicated with the fluid loop through the return interface or is opened;

the main pressure cavity is communicated with the driving fluid station through the main pressure fluid inlet to inject driving fluid;

the space in the main pressure cavity is enlarged along with the injection of the driving fluid, and the driving fluid finally pushes the main piston to move forwards along the main cylinder body; the main piston rod is driven to extend out by the movement of the main piston;

the extension speed of the main piston rod is V2, and the output thrust is F2;

V1>V2；F1<F2。

as a further improvement of the present invention, the driving fluid station to which the fast propulsion chamber is connected in the first working mode of the energy-saving and efficiency-increasing linear driving cylinder in the fast extension mode and the driving fluid station to which the main pressure chamber is connected in the second working mode in the main pressure mode are the same driving fluid station, and the rated output fluid pressure and fluid speed are the same.

As a further improvement of the present invention, in a first working mode of the energy-saving and efficiency-increasing linear driving cylinder in the fast extension mode, the driving fluid station to which the fast propulsion chamber is connected is a first driving fluid station;

in a second working mode in the main pressure mode, the driving fluid station connected with the main pressure cavity is a second driving fluid station;

a nominal fluid output speed of the first drive fluid station is greater than a nominal fluid output speed of the second drive fluid station;

the rated fluid output pressure of the first drive fluid station is less than the rated fluid output pressure of the second drive fluid station.

As a further improvement of the invention, when the main piston rod retracts and resets, the third operating mode and the reset mode are operated;

the rapid propulsion cavity and the main pressure cavity are communicated with a fluid loop or are opened through respective interfaces sequentially, respectively or simultaneously; discharging the fluid medium in the fast propulsion cavity and the main pressure cavity;

the return cavity is communicated with the driving fluid station through the return interface and is used for injecting driving fluid;

the space in the return cavity is enlarged along with the injection of the driving fluid, and the driving fluid pushes the rod side of the main piston to move backwards so as to drive the main piston rod to retract backwards and reset;

the main piston pushes the auxiliary piston to move backwards, fluid media in the quick propelling cavity are discharged, and resetting is carried out.

In a third aspect of the invention, a bidirectional output method of an energy-saving and efficiency-increasing linear driving cylinder is provided,

the quick propelling cavity is formed between the auxiliary piston and the rear cover along the main cylinder body;

the quick propelling port is positioned on the rear cover or the main cylinder body close to the rear cover;

the auxiliary piston and the auxiliary piston rod form another set of piston type linear driving cylinder at the position of the main cylinder body close to the rear cover;

the part of the main piston rod, which is positioned outside the main cylinder body, and the part of the auxiliary piston rod, which is positioned outside the main cylinder body, are respectively connected with a part to be driven of the working equipment;

the working mode I is a main piston rod quick extension mode;

the quick propelling cavity is communicated with the driving fluid station through the quick propelling interface and is used for injecting driving fluid;

the return cavity is communicated with the fluid loop through the return interface or is opened;

the main pressure cavity is kept closed, or the size of the inner cavity is unchanged;

the space in the quick propelling cavity becomes larger along with the injection of the driving fluid, and the driving fluid finally pushes the auxiliary piston to move forwards along the main cylinder body; the auxiliary piston moves to push the main piston to synchronously move forwards so as to drive the main piston rod to extend out;

the extension speed of the main piston rod is V1, and the output thrust is F1;

a working mode II, namely a main pressure output mode of the main piston rod;

the quick propelling interface of the quick propelling cavity is kept closed, and fluid media in the quick propelling cavity are kept;

the return cavity is communicated with the fluid loop through the return interface or is opened;

the main pressure cavity is communicated with the driving fluid station through the main pressure fluid inlet to inject driving fluid;

the space in the main pressure cavity is enlarged along with the injection of the driving fluid, and the driving fluid finally pushes the main piston to move forwards along the main cylinder body; the main piston rod is driven to extend out by the movement of the main piston;

the extension speed of the main piston rod is V2, and the output thrust is F2;

V1>V2；F1<F2；

a working mode III, namely a rapid extension mode of the auxiliary piston rod;

the return cavity is communicated with the driving fluid station through the return interface and is used for injecting driving fluid;

the rapid propulsion cavity is communicated with the fluid circuit through the rapid propulsion interface or is opened;

the main pressure cavity is kept closed, or the size of the inner cavity is unchanged;

the space in the return cavity is enlarged along with the injection of the driving fluid, and the driving fluid finally pushes the main piston to move backwards along the main cylinder body; the main piston moves to push the auxiliary piston to synchronously move backwards so as to drive the auxiliary piston rod to extend out;

the extension speed of the auxiliary piston rod is V3, and the output thrust is F3;

the working mode is IV, and the auxiliary piston rod is in a main pressure output mode;

the return interface of the return cavity is kept closed, and fluid media in the quick propelling cavity are kept;

the rapid propulsion cavity is communicated with the fluid circuit through the rapid propulsion interface or is opened;

the main pressure cavity is communicated with the driving fluid station through the main pressure fluid inlet to inject driving fluid;

the space in the main pressure cavity is enlarged along with the injection of the driving fluid, and the driving fluid finally pushes the auxiliary piston to move backwards along the main cylinder body; the auxiliary piston moves to drive the auxiliary piston rod to extend out;

the extension speed of the auxiliary piston rod is V4, and the output thrust is F4;

V3>V4；F3<F4；

the main piston rod and the auxiliary piston rod have opposite main pressure output directions.

In a fourth aspect of the present invention, there is provided an application of an energy saving and efficiency increasing linear driving cylinder, wherein the energy saving and efficiency increasing linear driving cylinder is a hydraulic cylinder, and the driving fluid is hydraulic oil;

the energy-saving synergistic linear driving cylinder is used as a hydraulic driving cylinder and applied to a gantry shear, a hydraulic packing machine, a hydraulic crusher, a hydraulic forging machine and a metal scrap briquetting machine.

According to the energy-saving synergistic linear driving cylinder and the using method thereof, the auxiliary piston and the auxiliary piston rod are additionally arranged in the cylinder body; a quick propelling cavity is arranged along the auxiliary piston and the auxiliary piston rod or along the auxiliary piston rod, and the main piston rod can be quickly stretched out by reducing the area; and a main pressure cavity is arranged between the auxiliary piston and the main piston, and is communicated with the driving fluid station through a main pressure fluid inlet, so that the effective working area of the main pressure cavity is reserved, and larger working pressure can still be output when large pressure needs to be provided.

The energy-saving and efficiency-increasing linear driving cylinder and the use method thereof improve the running speed during idle work or low-power stroke and reduce the fluid consumption by improving the internal structure, thereby improving the running efficiency of equipment and reducing the power consumption of a driving fluid station.

Drawings

FIG. 1 is a schematic view of the overall structure of the energy-saving and efficiency-increasing linear driving cylinder of the present invention;

FIG. 2 is a schematic overall structural diagram of a first embodiment of the energy-saving and efficiency-increasing linear driving cylinder of the present invention;

FIG. 3 is a schematic overall structure diagram of a second embodiment of the energy-saving and efficiency-increasing linear driving cylinder of the present invention;

FIG. 4 is a schematic overall structure diagram of a third embodiment of the energy-saving and efficiency-increasing linear driving cylinder of the present invention;

FIG. 5 is a schematic structural view of another arrangement of the primary pressure fluid inlet of the present invention;

FIG. 6 is a schematic illustration of cross-sectional parameter labeling of important components of the present invention;

FIG. 7 is a schematic diagram of the arrangement of the reserved main pressure chamber of the present invention;

reference numerals are as follows: a main cylinder 101, a front cover 102, and a rear cover 103; an auxiliary cylinder body 104, a third cylinder head 105;

a main piston 201, a main piston rod 202; an auxiliary piston 301 and an auxiliary piston rod 302; a quick push piston 303;

a fast propulsion chamber 401, a main pressure chamber 402, a return chamber 403; a first rod chamber 404, a second rod chamber 405;

a reserved main pressure chamber 406;

a fast propulsion interface 501, a main pressure fluid inlet 502, a return interface 503;

a first auxiliary interface 504, a second auxiliary interface 505; guide channel 511, connecting hard pipe 512, connecting interface 513.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1, it is a schematic view of the overall structure of the energy-saving and efficiency-increasing linear driving cylinder of the present invention; the main body of the energy-saving synergistic linear driving cylinder is still a piston driving cylinder, the structure of the energy-saving synergistic linear driving cylinder is consistent with that of the existing common piston hydraulic cylinder or a piston cylinder, and the energy-saving synergistic linear driving cylinder comprises a main cylinder body 101, a front cover 102 and a rear cover 103; a main piston 201 and a main piston rod 202 are arranged in the main cylinder body 101; the main piston 201 is embedded in the main cylinder 101 and matched with the inner cavity of the main cylinder 101, and divides the main cylinder 10 into 2 independent chambers which are not communicated with each other; the main piston rod 202 is positioned on the main piston 201, the main piston rod 202 penetrates through the front cover 102, and the part of the main piston rod 202, which is positioned outside the front cover 102, is a linear driving element and can be connected with an element to be driven of a target device; generally, the front cover 102 is provided with a flange mounting hole for mounting on a rack of a target device to realize fixation; a return interface 503 is arranged on the wall surface of the main cylinder body 101 close to the front cover 102; a return cavity 403 is formed between the main piston 201 and the front cover 102 along the main cylinder 101, the return cavity 403 is connectable to a driving fluid station through the return port 503, and by injecting a fluid into the return cavity 403, the outer side surface of the main piston 201 is pushed to move backwards, so that the main piston rod 202 moves backwards. Since the main piston rod 202 is located in the return chamber 403, the effective fluid pushing area (S3) of the return chamber 403 is smaller than the entire cross-sectional area of the main piston 201 (or the cross-sectional area of the inner cavity of the main cylinder 101), so that the return force (i.e., the reverse force) of the piston driving cylinder is smaller, but the corresponding return speed is faster because the fluid injection cross-sectional area is also smaller.

The improvement of the energy-saving synergistic linear driving cylinder is that an auxiliary piston 301 is also arranged in the main cylinder body 101, and the auxiliary piston 301 is positioned between the main piston 201 and the rear cover 103; the auxiliary piston 301 is embedded in the main cylinder 101 and is matched with the inner cavity of the main cylinder 101; an auxiliary piston rod 302 is arranged on the auxiliary piston 301, and the auxiliary piston rod 302 penetrates through the rear cover 103 and is partially positioned outside the main cylinder body 101.

The invention is provided with a quick propelling cavity 401 along the auxiliary piston 301 and the auxiliary piston rod 302 or only along the auxiliary piston rod 302; the quick propelling cavity 401 is located inside the main cylinder 101 or outside the main cylinder 101; preferably, the maximum inner diameter of the fast propulsion cavity 401 is smaller than or equal to the inner cavity diameter of the main cylinder 101; the fast propulsion chamber 401 is connected with the driving fluid station through a fast propulsion interface 501; the effective fluid pushing area (S1) of the fast propulsion chamber 401 is smaller than the cross-sectional area of the inner cavity of the main cylinder 101 because of the presence of the auxiliary piston rod 302 in the fast propulsion chamber 401.

A main pressure cavity 402 is formed between the auxiliary piston 301 and the main piston 201 along the main cylinder 101; the main pressure chamber 402 is connected to a drive fluid station via a main pressure fluid inlet 502; the effective fluid pushing area (S2) of the main pressure chamber 402 is the cross-sectional area of the inner chamber of the main cylinder 101.

S2>S1；S2>S3。

Embodiments of the fast propulsion chamber 401 and the fast propulsion interface 501 may be further described with reference to fig. 2-4.

In one embodiment, as shown in fig. 2;

the quick-advancing cavity 401 is located between the secondary piston 301 and the rear cover 103, and the quick-advancing interface 501 is preferably located on the rear cover 103; that is, the sub piston 301 and the sub piston rod 302 form another set of piston driving cylinders at a portion of the main cylinder 101 near the rear cover 103.

The effective fluid displacement area (S1) of the rapid propulsion chamber 401 is the cross-sectional area of the secondary piston 301 minus the cross-sectional area of the secondary piston rod 302.

Embodiment two, as shown in fig. 3; embodiment three, as shown in fig. 4;

the quick-advancing cavity 401 is located outside the rear cover 103; on the outside of the rear cover 103, there is provided a sub-cylinder 104,

the part of the auxiliary piston rod 302 outside the rear cylinder cover 103 is completely positioned in the auxiliary cylinder body 104; the tail end of the auxiliary cylinder body 104 is closed by a third cylinder cover 105; the fast propulsion chamber 401 is located within the secondary cylinder 104.

The rear part of the auxiliary piston rod 302 is arranged in the auxiliary cylinder body 104 to form another set of linear driving cylinder, and the tail end of the auxiliary piston rod 302 can be driven by injecting driving fluid into the quick propelling cavity 401, so as to push the auxiliary piston 30 1.

As shown in fig. 3, in the second embodiment, the linear driving cylinder formed in the secondary cylinder 104 at the rear part of the secondary piston rod 302 is a plunger type driving cylinder, and the rapid propulsion cavity 401 is formed in the secondary cylinder 104; the quick-propulsion interface 501 may be located on the third cylinder head 105 (as shown), or on the secondary cylinder block 104, or even on the rear cylinder head 10 3.

The effective fluid pushing area (S1) of the fast propulsion chamber 401 is the area of the tail of the secondary piston rod 302 in contact with the fluid in the fast propulsion chamber 401.

A first rod chamber 404 is formed between the secondary piston 301 and the rear cover 103 along the main cylinder 101, and a fluid medium may be filled into the first rod chamber 404 or may be open; when a closed fluid medium is arranged in the first rod chamber 404, a first auxiliary interface 504 is arranged on the rear cover 103 (as shown in the figure) or at the tail end of the main cylinder body 101, and the first rod chamber 404 is communicated with a fluid medium source through the first auxiliary interface 504; when the first rod chamber 404 is not filled with a closed fluid medium, i.e., is kept open, the same first auxiliary port 504 may be provided to keep the first rod chamber 404 in a normally open state, or a gap channel is left in the assembly of the rear cover 103 and the auxiliary piston rod 302, or a gap channel is left in the assembly of the rear cover 103 and the main cylinder 101, so that the first rod chamber 404 can be communicated with the outside.

As shown in fig. 4, in the third embodiment, a quick-push piston 303 is further disposed at the end of the auxiliary piston rod 302; the quick-push piston 303 is embedded in the auxiliary cylinder body 104 and is matched with an inner cavity of the auxiliary cylinder body 104; the rear part of the auxiliary piston rod 302, and the quick-push piston 303, the linear driving cylinder formed in the auxiliary cylinder 104 is a piston-type driving cylinder, and the quick-push cavity 401 is formed between the quick-push piston 303 and the third cylinder cover 105 along the auxiliary cylinder 104; the quick-propulsion interface 501 may be located on the third cylinder head 105 (as shown) or at the end of the secondary cylinder 104.

The effective fluid displacement area (S1) of the rapid propulsion chamber 401 is the area of contact between the rapid propulsion piston 303 and the fluid in the rapid propulsion chamber 401.

In addition to the second embodiment, the third embodiment also includes a first rod chamber 404 and a first auxiliary port 504; meanwhile, a second rod-containing cavity 405 is formed between the quick-push piston 303 and the rear cover 103 along the auxiliary cylinder 104, and a fluid medium can be filled into the second rod-containing cavity 405 or the second rod-containing cavity can be opened; when a closed fluid medium is arranged in the second rod cavity 405, a second auxiliary interface 505 is arranged on the rear cover 103 or at the end part (as shown in the figure) of the auxiliary cylinder body 104, and the second rod cavity 405 is communicated with a fluid medium source through the second auxiliary interface 505; when the second rod chamber 405 is not filled with a closed fluid medium, i.e., is kept open, the same second auxiliary port 505 may be provided to keep the second rod chamber 405 in a normally open state, or a gap passage may be left in the assembly of the rear cover 103 and the sub-cylinder 104 to allow the second rod chamber 405 to communicate with the outside. The second rod cavity 405 and the first rod cavity 404 are both follower cavities, and they may be kept in communication or independent of each other.

According to the above embodiment, the main pressure fluid inlet 502 needs to communicate with the main pressure chamber 402, so there are 3 positions:

as shown in fig. 5, when the fluid filling position of the primary pressure cavity 402 is fixed relative to the position of the primary cylinder 101, a first primary pressure fluid port is provided on the primary cylinder 101 as the primary pressure fluid inlet 502; when the primary pressure cavity 402 moves to the location of the first primary pressure fluid interface, a driving fluid may be injected into the primary pressure cavity 402 through the first primary pressure fluid interface.

As shown in fig. 5, since the main pressure chamber 402 is in contact with the main piston 201, a second main pressure fluid channel is provided as the main pressure fluid inlet 502 along the main piston 201 via the main piston rod 202; the inner opening of the second main pressure fluid channel is located on the end face of the main piston 201, and the outer opening of the second main pressure fluid channel is located at the end of the main piston rod 202 and is always located on the outer side of the front cover 102.

However, in the setting mode i, the main pressure chamber 402 needs to be fixed in the fluid filling position each time, otherwise, a plurality of first main pressure fluid ports need to be arranged along the main cylinder 101.

In the setting mode ii, the interface is located on the main piston rod 202, and the main piston rod 202 is often located at the device action position, which is not convenient for installing the pipeline.

Therefore, in the setting mode iii of the main pressure fluid inlet 502, as shown in fig. 1 to 4, since the auxiliary piston 301 is also in contact with the main pressure chamber 402, a third main pressure fluid passage is provided as the main pressure fluid inlet 502 along the auxiliary piston 301 via the auxiliary piston rod 302.

As shown in fig. 2, in the first embodiment, the primary pressure fluid inlet 502 extends directly from the end of the secondary piston rod 302 to the inner end surface of the secondary piston 301.

As shown in fig. 3 and 4, in the second and third embodiments, since the end of the auxiliary piston rod 302 is wrapped and closed by the auxiliary cylinder 104, a passage through which the auxiliary piston rod 302 and the auxiliary piston 301 pass is provided as the main pressure fluid inlet 502, and a connection passage is provided between the end of the auxiliary piston rod 302 and the auxiliary cylinder 104 or the third cylinder head 105; in the embodiment shown in the drawings, it is preferable that a connection port 513 is provided on the third cylinder head 105, and the main pressure fluid inlet 502 in the auxiliary piston rod 302 is connected to the connection port 513 through a hose or a hard pipe. In the embodiment of the figure, the connection is preferably made by using a connection hard pipe 512; in the vice piston rod 302 the main fluid entry 502 that presses is as direction passageway 511, it inserts to connect hard tube 512 in the direction passageway 511, connect the outer wall of hard tube 512 with be equipped with sliding seal structure between the inner wall of direction passageway 511, it fixes to connect hard tube 512 on the third cylinder cap 105, when vice piston rod 302 removes, will change it is in to connect hard tube 512 length in the direction passageway 511, when realizing the distance change, ensure that the main fluid entry 502 that presses communicates with each other with the drive fluid station. Since the connection rigid tube 512 will occupy the fluid pushing area, in the second and third embodiments, the outer wall area of the connection rigid tube 512 needs to be subtracted when calculating the effective fluid pushing area (S1) of the fast propulsion chamber 401. When the connecting pipe is a hose, the hose is preset in the fast propulsion cavity 401, and when fluid is injected, the increased volume of the fast propulsion cavity 401 is irrelevant to the volume of the hose, so that the sectional area of the hose does not need to be subtracted when calculating the effective fluid propulsion area (S1) of the fast propulsion cavity 401. Meanwhile, when the volume of the fast propulsion chamber 401 changes, the size of the connection hard tube 512 in the guide channel 511 also changes, and the volume occupied by the fluid in the guide channel 511 also changes correspondingly, when the main pressure chamber 402 remains closed, a part of the fluid may enter the guide channel 511, or cause the volume of the main pressure chamber 402 to change, which is not considered too much in the following calculation process.

A part of space is preferably reserved in the primary pressure chamber 402, and accordingly, a plurality of protrusions (which may be raised ring surfaces, raised cylinders, or even raised lines) may be disposed on the inner side surface of the primary piston 201 or the inner side surface of the secondary piston 301, so that the primary piston 201 and the secondary piston 301 are always kept separated. When the driving fluid is injected into the main pressure cavity 402, the protrusion does not participate in the action any more and does not occupy the effective fluid pushing area of the main pressure cavity 402 after the main pressure cavity 402 is enlarged.

As shown in fig. 6, the internal sectional parameters according to the present invention are labeled:

(1) A = the cross-sectional area of the cavity of the main cylinder 101 = the cross-sectional area of the main piston 201 = the cross-sectional area of the auxiliary piston 301;

(2) B = cross-sectional area of the main piston rod 202;

(3) C = cross sectional area of the secondary piston rod 302;

(4) D = the cross-sectional area of the inner cavity of the secondary cylinder 104 = the cross-sectional area of the quick-push piston 303;

(5) E = outer diameter cross-sectional area of the connecting tube (connecting hard tube 512);

when the main pressure fluid inlet 502 adopts the setting mode i and the setting mode ii, E =0.

The effective fluid pushing area S2 of the main pressure chamber 402 and the effective fluid pushing area S3 of the return chamber 403 remain unchanged, i.e., S2= a and S3= a-B; s2> S3.

The effective fluid driving area S1 of the fast propulsion chamber 401 varies according to the specific implementation.

As shown in fig. 6 (a), in the first embodiment: s1= a-C; s2> S1.

As shown in fig. 6 (b), in the second embodiment: s1= C-E; s2> S1.

As shown in fig. 6 (c), in the third embodiment: s1= D-E; s2> S1.

When the linear cylinder of the present invention is used, it is preferable that the main cylinder body 101 is fixed to a frame of a target device, particularly, the front cover 102, and then the end of the main piston rod 202 is connected to a device operating portion; the telescopic motion of the main piston rod 202 drives the device to work with the relevant components.

When the linear driving cylinder is used, a driving fluid station (a hydraulic pump or an air pressure pump) needs to be connected, and the output of the driving fluid station is set to be stable at an output flow rate Q (m) ³ /s) and an output pressure of P (Pa).

The linear driving cylinder of the invention has at least three relatively independent working modes (the friction force, the resistance and the like of each part are not considered temporarily):

the working mode I is a quick extension mode;

the quick propelling cavity 401 is communicated with the driving fluid station through the quick propelling interface 501, and is filled with driving fluid;

the return cavity 403 is communicated with a fluid circuit through the return interface 503, or is opened;

the main pressure fluid inlet 502 of the main pressure chamber 402 remains closed, or open.

The auxiliary piston 301, the auxiliary piston rod 302 or the quick-push piston 303 is pushed by the driving fluid in the quick-push cavity 401, so that the auxiliary piston 301 moves forwards along the main cylinder 101; the movement of the secondary piston 301 pushes the primary piston 201 to move forward synchronously (by mutual contact or by fluid medium in the enclosed primary pressure chamber 402), and finally pushes the primary piston rod 202 to extend.

During this process, the fluid medium in the return chamber 403 is discharged.

When the secondary piston 301 pushes the primary piston 201 directly forward, the primary pressure chamber 402 may remain open or open to the fluid circuit; or the main pressure cavity 402 is kept small, the main pressure cavity 402 is closed, and when the fluid medium in the main pressure cavity 402 is hydraulic oil, the further compression space of the main pressure cavity 402 is almost not available; the forward movement distance of the sub-piston 301 coincides with the forward movement distance of the main piston 201.

When the primary pressure cavity 402 is kept small in size, the primary pressure cavity 402 is closed, but the fluid medium in the primary pressure cavity 402 is gas, the primary pressure cavity 402 is compressed under force until equilibrium due to the fact that the gas has strong volume compressibility, and therefore the primary piston 201 is influenced by front end resistance, and the forward movement distance is smaller than that of the secondary piston 301. The process analysis needs to be combined with specific external conditions, and the analysis is not carried out any more.

The forward moving distance of the main piston rod 202, the main piston 201, the auxiliary piston 301 and the auxiliary piston rod 302 is L1; therefore, in the first operating mode of the fast extension mode, the output parameters of the main piston rod 202 are:

operating speed V1= Q ÷ S1;

time-to-reach T1= L1 ÷ V1= L1 × S1 ÷ Q;

output thrust F1= P × S1;

and the output fluid volume of the driving fluid station M1= L1 × S1.

A second working mode, a main pressure mode; when the main piston rod 202 needs to output a larger thrust, the operation mode is switched to the second operation mode;

the fast propulsion interface 501 of the fast propulsion chamber 401 remains closed, and fluid media in the fast propulsion chamber 401 is maintained;

the return cavity 403 is communicated with a fluid circuit through the return interface 503, or is opened;

the main pressure chamber 402 communicates with the drive fluid station through the main pressure fluid inlet 502 for injection of drive fluid.

The driving fluid is directly injected into the primary pressure chamber 402, and simultaneously applies thrust to the primary piston 201 and the secondary piston 301.

Since the fast propulsion chamber 401 remains closed, when the fluid medium in the fast propulsion chamber 401 is liquid, there is little further compression space in the fast propulsion chamber 401, so the secondary piston 301 will remain in position as soon as the operating mode is finished.

When the fluid medium in the fast propulsion chamber 401 is gas, the fast propulsion chamber 401 is affected by the pressure of the main pressure chamber 402 due to the strong volume compressibility of the gas, and is compressed until equilibrium, so that the secondary piston 301 is slightly shifted backward with respect to the position at the end of the working mode. The process is not expanded here.

With the driving fluid injected into the primary pressure chamber 402, the primary piston 201 is forced to drive the primary piston rod 202 to move forward continuously, and the forward movement distance is L2; therefore, in the second working mode of the main pressure mode, the output parameters of the main piston rod 202 are:

operating speed V2= Q ÷ S2;

time-to-reach T2= L2 ÷ V2= L2 × S2 ÷ Q;

output thrust F2= P × S2;

and the output fluid volume of the drive fluid station M2= L2 × S2.

In summary, in the energy-saving and efficiency-increasing linear driving cylinder of the present invention, regardless of the switching time between the first operation mode and the second operation mode, the extending time of the entire main piston rod 202 is T:

T＝T1+T2＝L1×S1÷Q+L2×S2÷Q；

and the total fluid output of the drive fluid station is M:

M＝M1+M2＝L1×S1+L2×S2。

if the existing linear driving cylinder is adopted: the extension speed of the piston rod V' = Q/S2;

the extending time of the whole piston rod is T '= (L1 + L2) ÷ V' = L1 × S2 ÷ Q + L2 × S2 ÷ Q;

and the total fluid output M' = L1 × S2+ L2 × S2 of the driving fluid station.

Compared with the existing linear driving cylinder, the energy-saving synergistic linear driving cylinder of the invention,

saving projection time Δ T = T' -T = L1 × S2 ÷ Q-L1 × S1 ÷ Q = L1 × (S2-S1) ÷ Q;

the injection-saving driving fluid dosage Δ M = M' -M = L1 × S2-L1 × S1= L1 × (S2-S1);

namely, when the moving distance L1 in the first working mode (idle or low power stroke) of the fast extension mode is longer, the effective fluid pushing area S1 of the fast propulsion chamber 401 is smaller, the extension time consumption is correspondingly saved more, the consumption of the injected driving fluid is saved more, and the energy-saving and efficiency-increasing effect of the energy-saving and efficiency-increasing linear driving cylinder is more obvious.

In the process, the driving fluid stations connected with the 2 working processes of the energy-saving and efficiency-increasing linear driving cylinder are the same; however, in order to further improve efficiency, since the requirement for the working thrust is generally low in the first working mode of the fast extension mode, even only idle stroke, a first driving fluid station with large output flow and low output pressure can be adopted to connect into the fast propulsion chamber 401 for fast propulsion output in the first working mode. When entering the second working mode of the main pressure mode, a second driving fluid station with high-pressure output can be used to access the main pressure chamber 402 for high-thrust output of the second working mode because of the large working thrust required. By configuring 2 driving fluid stations with different output performances, the working efficiency can be further improved, the comprehensive energy consumption of the driving fluid stations, the purchase configuration cost and the maintenance cost are expected to be reduced (the 2 driving fluid stations work alternately, the idle time is longer, the heat dissipation time is more, and the service life can be correspondingly prolonged).

According to the energy-saving synergistic linear driving cylinder, when the L1 distance of the first working mode is fixed, the initial position of the main pressure cavity 402 on the main cylinder body 101 is also fixed, the main pressure fluid inlet 502 can adopt the setting mode I, and a first main pressure fluid interface is arranged on the main cylinder body 101.

When the linear driving cylinder of the present invention is used, if the primary pressure chamber 402 between the secondary piston 301 and the primary piston 201 is too small or even completely absent when the working mode is over to the working mode two, the generation of the primary thrust F2 in the subsequent primary pressure process is often affected, so that at the beginning of the working mode or during the working mode, when the required working thrust is small (i.e. the working resistance is small), a piston separation process can be set, such that the primary pressure fluid inlet 502 is briefly communicated with the driving fluid station, and the driving fluid is injected to form the primary pressure chamber 402. Alternatively, a support (which may be a raised ring surface, a raised cylinder, or even a raised grain; which may be formed by removing material from the end surface of the piston in a milling manner; or by installing a raised object on the end surface of the piston) is provided between the secondary piston 301 and the primary piston 201, so that the two are separated at least by a certain distance, and the primary pressure chamber 402 is always present.

As shown in fig. 7, the end of the secondary piston 301 is provided with a recess to form a reserved main pressure chamber 406, the periphery of the reserved main pressure chamber 406 forms a support body, and when the main pressure fluid inlet 502 is opened, the support body on the periphery of the reserved main pressure chamber 406 can be abutted against the primary piston 201 to directly push the primary piston 201; the main pressure fluid inlet 502 is preferably arranged in an arrangement mode iii, and a third main pressure fluid channel is arranged in the auxiliary piston 301 and the auxiliary piston rod 302 and serves as the main pressure fluid inlet 502; at this time, the area S4 of the contact surface between the reserved main pressure chamber 406 and the main piston 201 is equal to or larger than the cross-sectional area S1 of the rapid advance chamber 3.

Further, based on the above embodiment, a recess may also be provided at the end of the main piston 201; the recess may not be located completely in the middle of the piston, e.g. offset to one side; the depressions may also not be present completely in the form of circular depressions, such as rectangular, oval, or even irregular shapes; the recess may also be communicated with the inner wall of the main cylinder 101, so that the main pressure fluid inlet 502 is arranged in the arrangement mode i, that is, a first main pressure fluid port is arranged on the main cylinder 101, and the driving fluid is injected into the reserved main pressure cavity 406 of the recess through the first main pressure fluid port.

That is, when the linear driving cylinder of the present invention is applied to the field of hydraulic baling press (horizontal hydraulic full-automatic baling press with chinese patent publication No. CN 1765617A) and the like requiring continuous increasing of output pressure, the linear driving cylinder of the present invention operates in the fast extension process of the first working mode, and the auxiliary piston 301 pushes the main piston 201 to move forward through the supporting body at the periphery of the reserved main pressure cavity 406; when the first working mode is transited to the second working mode, the driving fluid is directly injected into the reserved main pressure cavity 406 through the main pressure fluid inlet 502 of the third main pressure fluid channel, at this time, as S4 is larger than or equal to S1, the output thrust F1 which is not smaller than the output thrust F1 in the quick extension process of the first working mode is also generated instantaneously, so that the main piston 201 can be directly pushed, once the main pressure cavity 402 is formed by pushing away, the output thrust is also improved to F2, and the main pressure process of the second working mode is entered.

In the above process, the main pressure fluid inlet 502 preferably adopts a setting mode iii (third main pressure fluid channel), which can ensure that the driving fluid can smoothly enter the reserved main pressure cavity 406 and can maximize the area of the main pressure cavity 402 on the main piston 201 side.

The energy-saving synergistic linear driving cylinder can be used as a hydraulic driving cylinder and applied to a gantry shear (replacing a main pressure oil cylinder (2) and a synchronous oil cylinder (3) in a hydraulic synchronous gantry shear with the Chinese patent publication No. CN 205362819U), a hydraulic packer (replacing a door cover oil cylinder (21), a main pressure oil cylinder (301), particularly a side pressure oil cylinder (41) and the like in a hydraulic packer with the Chinese patent publication No. CN 110281566A), a hydraulic crusher (replacing a ramming oil cylinder (1) and the like in a reinforced concrete beam pre-crushing device with the Chinese patent publication No. CN 107008560A), a metal chip briquetting machine (replacing a main pressure cylinder (2) and the like in an extrusion forming die of a horizontal metal chip briquetting machine with the Chinese patent publication No. CN 107011202169U), and a hydraulic forging machine.

The above processes, the first working mode of the fast extension mode and the second working mode of the main pressure mode do not indicate the sequential working process of the energy-saving and efficiency-improving linear driving cylinder of the invention, the fast extension mode and the main pressure mode can be reasonably allocated and set according to the specific equipment use requirements, and the 2 working processes can even be alternately performed, for example, the alternate operation is performed in the forms of 'working mode one/working mode two/working mode one', 'working mode two/working mode one/working mode two', 'working mode one/working mode two/working mode one/working mode two', and the like.

According to the energy-saving synergistic linear driving cylinder, after the main piston rod 202 is stretched out and works, the main piston rod needs to be retracted and restored to the initial position, and at the moment, the working mode III and the reset mode can be entered;

the fast propulsion chamber 401 is communicated with a fluid circuit through the fast propulsion interface 501, or is open;

the main pressure chamber 402 is in communication with a fluid circuit, or open, through the main pressure fluid inlet 502;

the return chamber 403 communicates with the drive fluid station via the return port 503 to inject the drive fluid.

Driving fluid is directly injected into the return cavity 403 to apply thrust to the main piston 201, so that the main piston 201 is driven to retract; in this process, the fluid medium in the quick-advancing chamber 401 and the main pressure chamber 402 is discharged, and the secondary piston 301 and the secondary piston rod 302 are returned as they are retracted.

The third working mode of the reset mode of the energy-saving and efficiency-increasing linear driving cylinder is consistent with the performance of the existing linear driving cylinder.

In the first embodiment of the energy saving and efficiency improving linear actuator according to the present invention, since the auxiliary piston rod 302 is also located outside the main cylinder block 101, the energy saving and efficiency improving linear actuator according to the present invention in the first embodiment can be used as a bidirectional output linear actuator. As shown in fig. 2, when the fast extension mode is required, the driving fluid is injected into the fast propulsion chamber 401 through the fast propulsion interface 501, or the driving fluid is injected into the return chamber 403 through the return interface 503, while the main pressure chamber 402 remains closed or fixed in size. When the main pressure mode is needed, the interface far away from the direction of extending out the piston rod is closed, and the other interface is opened; namely, when the main piston rod 202 is required to output the main pressure, the fast propulsion interface 501 is closed, and the return interface 503 is opened; when the auxiliary piston rod 302 outputs the main pressure, the return interface 503 is closed, and the fast propulsion interface 501 is opened; at this time, the driving fluid may be injected into the main pressure fluid inlet 502.

While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the embodiments disclosed, but is capable of various modifications and substitutions without departing from the spirit of the invention.

Claims (10)

1. The energy-saving synergistic linear driving cylinder comprises a main cylinder body, a front cover and a rear cover; a main piston and a main piston rod are arranged in the main cylinder body;

the main piston rod is positioned on the main piston, and the main piston rod penetrates through the front cover to extend out of the main cylinder body; the main piston and the main piston rod are positioned in the main cylinder body to form a piston type linear driving cylinder;

a return cavity is formed between the main piston and the front cover along the main cylinder body, and the return cavity is communicated with the outside through a return interface; the effective fluid pushing area of the return cavity is S3;

the piston is characterized in that an auxiliary piston is further arranged in the main cylinder body and is positioned between the main piston and the rear cover;

the auxiliary piston is embedded in the main cylinder body and matched with the inner cavity of the main cylinder body;

an auxiliary piston rod is arranged on the auxiliary piston, penetrates through the rear cover and is partially positioned outside the main cylinder body;

a quick propelling cavity is arranged along the auxiliary piston and the auxiliary piston rod or along the auxiliary piston rod; the quick propelling cavity is positioned in the main cylinder body or outside the main cylinder body;

the rapid propulsion cavity is connected with an external driving fluid station through a rapid propulsion interface;

the effective fluid propelling area of the rapid propelling cavity is S1;

a main pressure cavity is formed between the auxiliary piston and the main piston along the main cylinder body; the main pressure cavity is connected with an external driving fluid station through a main pressure fluid inlet;

the effective fluid pushing area of the main pressure chamber is S2;

S2>S1；S2>S3。

2. an energy saving and efficiency increasing linear drive cylinder as set forth in claim 1 wherein said primary pressure chamber moves along the interior chamber of said primary cylinder block;

the main pressure fluid inlet is positioned in the main piston and the main piston rod or in the auxiliary piston and the auxiliary piston rod;

one end of the main pressure fluid inlet is communicated with the main pressure cavity through an opening on the main piston or the auxiliary piston;

the opening at the other end of the main pressure fluid inlet is positioned on the rod body or the end face of the main piston rod or the auxiliary piston rod outside the main cylinder body.

3. An energy efficient linear drive cylinder as defined in claim 1 wherein a main pressure fluid inlet is located on said main cylinder block;

when the main pressure chamber moves to the main pressure fluid inlet along the inner cavity of the main cylinder body, a driving fluid may be injected into the main pressure chamber through the main pressure fluid inlet.

4. The energy saving and efficiency increasing linear drive cylinder as set forth in claim 1, wherein a support is provided between said secondary piston and said primary piston; the drive chamber is always present between the secondary piston and the primary piston.

5. The use method of the energy-saving and efficiency-increasing linear driving cylinder is characterized in that the energy-saving and efficiency-increasing linear driving cylinder as claimed in any one of claims 1 to 4 is adopted; the main piston rod comprises 2 extension working modes:

the working mode I is a quick extension mode;

the quick propelling cavity is communicated with the driving fluid station through the quick propelling interface and is used for injecting driving fluid;

the return cavity is communicated with the fluid loop through the return interface or is opened;

the main pressure cavity is kept closed, or the size of the inner cavity is unchanged;

the space in the quick propelling cavity becomes larger along with the injection of the driving fluid, and the driving fluid finally pushes the auxiliary piston to move forwards along the main cylinder body; the auxiliary piston moves to push the main piston to synchronously move forwards so as to drive the main piston rod to extend out;

the extension speed of the main piston rod is V1, and the output thrust is F1;

a second working mode, a main pressure mode;

the quick propelling interface of the quick propelling cavity is kept closed, and fluid media in the quick propelling cavity is kept;

the return cavity is communicated with the fluid loop through the return interface or is opened;

the main pressure cavity is communicated with the driving fluid station through the main pressure fluid inlet and is used for injecting driving fluid;

the space in the main pressure cavity is enlarged along with the injection of the driving fluid, and the driving fluid finally pushes the main piston to move forwards along the main cylinder body; the main piston rod is driven to extend out by the movement of the main piston;

the extension speed of the main piston rod is V2, and the output thrust is F2;

V1>V2；F1<F2。

6. the method of claim 5, wherein the driving fluid station to which the fast-propelling chamber is connected in the first operating mode of the cylinder in the fast-extension mode is the same as the driving fluid station to which the main pressure chamber is connected in the second operating mode of the cylinder in the main pressure mode, and the rated output fluid pressure and fluid speed are the same.

7. The method of using an energy efficient linear actuator cylinder as claimed in claim 5 wherein said drive fluid station to which said fast propulsion chamber is connected in a first operating mode of said energy efficient linear actuator cylinder in fast extension mode is a first drive fluid station;

in a second working mode in the main pressure mode, the driving fluid station connected with the main pressure cavity is a second driving fluid station;

the rated fluid output speed of the first drive fluid station is greater than the rated fluid output speed of the second drive fluid station;

the rated fluid output pressure of the first drive fluid station is less than the rated fluid output pressure of the second drive fluid station.

8. The use method of the energy-saving and efficiency-increasing linear driving cylinder as claimed in claim 5, wherein when the main piston rod retracts and resets, the operation mode III and the reset mode are operated;

the rapid propulsion cavity and the main pressure cavity are communicated with a fluid loop or are opened through respective interfaces sequentially, respectively or simultaneously; discharging the fluid medium in the fast propulsion cavity and the main pressure cavity;

the return cavity is communicated with the driving fluid station through the return interface and is used for injecting driving fluid;

the space in the return cavity is enlarged along with the injection of the driving fluid, and the driving fluid pushes the rod side of the main piston to move backwards so as to drive the main piston rod to retract backwards and reset;

the main piston pushes the auxiliary piston to move backwards, and fluid media in the rapid propelling cavity are discharged to reset.

9. The bidirectional output method of the energy-saving synergistic linear driving cylinder is characterized in that the energy-saving synergistic linear driving cylinder as claimed in any one of claims 1 to 4 is adopted;

the quick propelling cavity is formed between the auxiliary piston and the rear cover along the main cylinder body;

the quick propelling interface is positioned on the rear cover or the main cylinder body close to the rear cover;

the auxiliary piston and the auxiliary piston rod form another set of piston type linear driving cylinder at the position of the main cylinder body close to the rear cover;

the part of the main piston rod, which is positioned outside the main cylinder body, and the part of the auxiliary piston rod, which is positioned outside the main cylinder body, are respectively connected with a part to be driven of the working equipment;

the working mode I is a main piston rod quick extension mode;

the quick propelling cavity is communicated with the driving fluid station through the quick propelling interface and is used for injecting driving fluid;

the return cavity is communicated with the fluid loop through the return interface or is opened;

the main pressure cavity is kept closed, or the size of the inner cavity is unchanged;

the space in the quick propelling cavity becomes larger along with the injection of the driving fluid, and the driving fluid finally pushes the auxiliary piston to move forwards along the main cylinder body; the auxiliary piston moves to push the main piston to synchronously move forwards so as to drive the main piston rod to extend out;

the extension speed of the main piston rod is V1, and the output thrust is F1;

a working mode II, a main pressure output mode of the main piston rod;

the quick propelling interface of the quick propelling cavity is kept closed, and fluid media in the quick propelling cavity is kept;

the return cavity is communicated with the fluid loop through the return interface or is opened;

the main pressure cavity is communicated with the driving fluid station through the main pressure fluid inlet and is used for injecting driving fluid;

the space in the main pressure cavity is enlarged along with the injection of the driving fluid, and the driving fluid finally pushes the main piston to move forwards along the main cylinder body; the main piston rod is driven to extend out by the movement of the main piston;

the extension speed of the main piston rod is V2, and the output thrust is F2;

V1>V2；F1<F2；

a working mode III, namely a rapid extension mode of the auxiliary piston rod;

the return cavity is communicated with the driving fluid station through the return interface and is used for injecting driving fluid;

the rapid propulsion cavity is communicated with the fluid circuit through the rapid propulsion interface or is opened;

the main pressure cavity is kept closed, or the size of the inner cavity is unchanged;

the space of the return cavity is enlarged along with the injection of the driving fluid, and the driving fluid finally pushes the main piston to move backwards along the main cylinder body; the main piston moves to push the auxiliary piston to synchronously move backwards so as to drive the auxiliary piston rod to extend out;

the extension speed of the auxiliary piston rod is V3, and the output thrust is F3;

the working mode is a fourth working mode, and the auxiliary piston rod is in a main pressure output mode;

the return interface of the return cavity is kept closed, and fluid media in the quick propelling cavity is kept;

the rapid propulsion cavity is communicated with the fluid circuit through the rapid propulsion interface or is opened;

the main pressure cavity is communicated with the driving fluid station through the main pressure fluid inlet and is used for injecting driving fluid;

the space in the main pressure cavity is enlarged along with the injection of the driving fluid, and the driving fluid finally pushes the auxiliary piston to move backwards along the main cylinder body; the auxiliary piston moves to drive the auxiliary piston rod to extend out;

the extension speed of the auxiliary piston rod is V4, and the output thrust is F4;

V3>V4；F3<F4；

the main piston rod and the auxiliary piston rod have opposite main pressure output directions.

10. The application of the energy-saving and efficiency-increasing linear driving cylinder is characterized in that the energy-saving and efficiency-increasing linear driving cylinder is adopted according to any one of claims 1 to 4, the energy-saving and efficiency-increasing linear driving cylinder is a hydraulic cylinder, and the driving fluid is hydraulic oil;

the energy-saving synergistic linear driving cylinder is used as a hydraulic driving cylinder and applied to a gantry shear, a hydraulic packing machine, a hydraulic crusher, a hydraulic forging machine and a metal scrap briquetting machine.

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