Energy-saving and efficiency-enhancing linear drive cylinder and its usage method

Abstract

The present invention relates to an energy-saving and efficiency-enhancing linear drive cylinder and its usage method. The drive cylinder includes 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; a secondary piston is further arranged in the main cylinder body, and the secondary piston is located between the main piston and the rear cover; a rapid propulsion chamber is arranged along the secondary piston and / or the secondary piston rod; a main pressure chamber is formed along the main cylinder body between the secondary piston and the main piston. When the drive cylinder is in use, drive fluid is injected into the rapid propulsion chamber to achieve rapid extension, and drive fluid is injected into the main pressure chamber to achieve main pressure output. By improving the internal structure of the linear drive cylinder and combining different drive fluid injection methods, the present invention improves the operating speed during idle or low-power strokes and reduces the fluid consumption, thereby improving the operating efficiency of the equipment and reducing the power consumption of the drive fluid station.

Description

Technical Field

[0001] The present invention relates to a hydraulic cylinder or a pneumatic cylinder for linear drive, and its usage method, which has the functions of energy saving and efficiency increase, and belongs to the field of mechanical drive elements. Background Art

[0002] In the field of mechanical equipment, hydraulic cylinders or pneumatic cylinders are often used to perform linear drive, which can be collectively referred to as linear drive cylinders. The main components of such linear drive cylinders include a cylinder body, a piston, and a piston rod; a cylindrical piston is provided in a cylindrical cylinder body, and a piston rod is provided on one side of the piston. The piston rod passes through the cylinder head at the end of the cylinder body, and the piston rod extends out of the cylinder body as a linear drive element; by injecting hydraulic oil or air into the cylinder body on one side of the piston, the piston is driven to move linearly along the cylinder body, and then the piston rod is driven to move linearly.

[0003] Since both the cylinder body and the piston are cylindrical with fixed areas, this results in that under the same driving pressure (the same driving hydraulic pressure or driving air pressure), to obtain a greater driving force, it is necessary to increase the cross-sectional areas of the piston and the inner cavity of the cylinder body, thus requiring a greater amount of driving fluid (oil volume or gas volume).

[0004] In a gantry shear (such as the gantry shear with the Chinese patent publication number CN206509581U, the double-edge shearing gantry shear with the Chinese patent publication number CN214264056U, etc.), a hydraulic baler (such as the horizontal hydraulic full-automatic baler with the Chinese patent publication number CN1765617A, the hydraulic baler with a push rod with the Chinese patent publication number CN216659013U, etc.), and even a press, etc., for equipment using a linear drive cylinder as a linear drive element, during the pressurization working process of the linear drive cylinder, a very long section of the stroke is often a non-effective or low-effective stroke, and only the last section is the stroke that requires a large pressure.

[0005] For these mechanical equipment, although the working stroke with a large pressure is short, due to the structural limitation of the existing linear drive cylinder, only a high-power linear drive cylinder with a long and large-sized piston can be used; although most of the stroke of the linear drive cylinder does not generate a large driving pressure due to the requirements of the equipment operation space or the product working characteristics, a large amount of driving fluid has to be injected to move the piston rod to the final working area.

[0006] When it is necessary to improve the working efficiency of the equipment, it is necessary to increase the flow rate of the driving fluid and the injection speed, which requires increasing the output fluid speed of the driving fluid station (hydraulic station or air compressor pump), inevitably increasing the cost of the equipment.

[0007] This is a problem that has long troubled the R & D personnel of mechanical equipment using linear drive cylinders. With the increasing market demand for improving the operating efficiency of equipment and reducing energy consumption, it is necessary to improve the structure of the linear cylinder body, thereby reducing energy consumption, increasing the driving speed, and improving the operating efficiency of the equipment where the linear drive cylinder is located. Summary of the Invention

[0008] The purpose of the present invention is to provide an energy-saving and efficiency-enhancing linear drive cylinder and its usage method, which can improve the operating speed of the linear drive cylinder during the idle or low-power stroke, reduce the fluid consumption, thereby improving the operating efficiency of the equipment and reducing the power consumption of the driving fluid station.

[0009] To achieve the above-mentioned invention purpose, in the first aspect of the present invention, there is provided an energy-saving and efficiency-enhancing linear drive cylinder, including 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;

[0010] The main piston rod is located on the main piston, and the main piston rod passes through the front cover and extends out of the main cylinder body; the main piston and the main piston rod form a piston-type linear drive cylinder within the main cylinder body;

[0011] A return stroke cavity is formed between the main piston and the front cover along the main cylinder body, and the return stroke cavity communicates with the outside through a return stroke interface; the effective fluid pushing area of the return stroke cavity is S3;

[0012] A secondary piston is further arranged in the main cylinder body, and the secondary piston is located between the main piston and the rear cover;

[0013] The secondary piston is embedded in the main cylinder body and is matched with the inner cavity of the main cylinder body;

[0014] A secondary piston rod is arranged on the secondary piston, the secondary piston rod passes through the rear cover, and part of it is located outside the main cylinder body;

[0015] The rapid propulsion cavity is connected to the external driving fluid station through a rapid propulsion interface;

[0016] The effective fluid pushing area of the rapid propulsion cavity is S1;

[0017] A main pressure cavity is formed between the secondary piston and the main piston along the main cylinder body; the main pressure cavity is connected to the external driving fluid station through a main pressure fluid inlet;

[0018] The effective fluid pushing area of the main pressure cavity is S2;

[0019] S2 > S1; S2 > S3.

[0020] As a further improvement of the present invention, the main pressure cavity moves along the inner cavity of the main cylinder body;

[0021] The main pressure fluid inlet is located inside the main piston and the main piston rod, or inside the auxiliary piston and the auxiliary piston rod;

[0022] One end of the main pressure fluid inlet communicates with the main pressure chamber through an opening on the main piston or the auxiliary piston;

[0023] The opening at the other end of the main pressure fluid inlet is located on the rod body or end face of the main piston rod or the auxiliary piston rod outside the main cylinder block.

[0024] As a further improvement of the present invention, the main pressure fluid inlet is located on the main cylinder block;

[0025] When the main pressure chamber moves along the inner cavity of the main cylinder block to the main pressure fluid inlet, driving fluid can be injected into the main pressure chamber through the main pressure fluid inlet.

[0026] As a further improvement of the present invention, a support is provided between the auxiliary piston and the main piston; the main pressure chamber always exists between the auxiliary piston and the main piston.

[0027] Furthermore, a recess is provided on the end face of the auxiliary piston or the main piston to form a reserved main pressure chamber;

[0028] A support body is formed around the reserved main pressure chamber;

[0029] When the volume of the main pressure chamber is the smallest, the support body around the reserved main pressure chamber abuts against the main piston or the auxiliary piston;

[0030] The area of the contact surface between the reserved main pressure chamber and the main piston is S4, and S4 ≥ S1.

[0031] In the second aspect of the present invention, a method for using an energy-saving and efficiency-enhancing linear drive cylinder is provided. The main piston rod includes two extended working modes:

[0032] Working mode one, rapid extension mode;

[0033] The rapid propulsion chamber communicates with the drive fluid station through the rapid propulsion interface to inject drive fluid;

[0034] The return stroke chamber communicates with the fluid circuit through the return stroke interface or is open;

[0035] The main pressure chamber remains closed or the inner cavity size remains unchanged;

[0036] As the driving fluid is injected into the fast - advancing cavity, the space in the cavity becomes larger, and the driving fluid finally pushes the auxiliary piston to move forward along the main cylinder block; the movement of the auxiliary piston pushes the main piston to move forward synchronously, thereby driving the main piston rod to extend.

[0037] The extending speed of the main piston rod is V1, and the output thrust is F1.

[0038] Working mode two, main - pressure mode.

[0039] The fast - advancing interface of the fast - advancing cavity remains closed to hold the fluid medium in the fast - advancing cavity.

[0040] The return cavity communicates with or is open to the fluid circuit through the return interface.

[0041] The main - pressure cavity communicates with the driving - fluid station through the main - pressure fluid inlet to inject the driving fluid.

[0042] As the driving fluid is injected into the main - pressure cavity, the space in the cavity becomes larger, and the driving fluid finally pushes the main piston to move forward along the main cylinder block; the movement of the main piston drives the main piston rod to extend.

[0043] The extending speed of the main piston rod is V2, and the output thrust is F2.

[0044] V1 > V2; F1 < F2.

[0045] As a further improvement of the present invention, the driving - fluid station connected to the fast - advancing cavity in working mode one of the fast - extending mode of the energy - saving and efficiency - enhancing linear - drive cylinder is the same driving - fluid station as the driving - fluid station connected to the main - pressure cavity in working mode two of the main - pressure mode, with the same rated output fluid pressure and fluid speed.

[0046] As a further improvement of the present invention, the driving - fluid station connected to the fast - advancing cavity in working mode one of the fast - extending mode of the energy - saving and efficiency - enhancing linear - drive cylinder is the first driving - fluid station.

[0047] The driving - fluid station connected to the main - pressure cavity in working mode two of the main - pressure mode is the second driving - fluid station.

[0048] The rated fluid output speed of the first driving - fluid station is greater than the rated fluid output speed of the second driving - fluid station.

[0049] The rated fluid output pressure of the first driving - fluid station is less than the rated fluid output pressure of the second driving - fluid station.

[0050] As a further improvement of the present invention, when the main piston rod retracts and returns to its original position, operating mode three, the reset mode, is executed;

[0051] The quick advance chamber and the main pressure chamber communicate with or are opened to the fluid circuit through their respective interfaces, either separately or simultaneously, to discharge the fluid medium in the quick advance chamber and the main pressure chamber;

[0052] The return stroke chamber communicates with the drive fluid station through the return stroke interface to inject drive fluid;

[0053] As the drive fluid is injected into the return stroke chamber, the space inside the chamber increases, and the drive fluid pushes the rod side of the main piston to move backward, thereby driving the main piston rod to retract and return to its original position;

[0054] The main piston pushes the sub-piston to move backward to discharge the fluid medium in the quick advance chamber for resetting.

[0055] In the third aspect of the present invention, a bidirectional output method for an energy-saving and efficiency-enhancing linear drive cylinder is provided.

[0056] The quick advance chamber is formed between the sub-piston and the rear cover along the main cylinder body;

[0057] The quick advance interface is located on the rear cover or on the cylinder body of the main cylinder body near the rear cover;

[0058] The sub-piston and the sub-piston rod form another set of piston-type linear drive cylinders at the part of the main cylinder body near the rear cover;

[0059] The part of the main piston rod outside the main cylinder body and the part of the sub-piston rod outside the main cylinder body are respectively connected to the components to be driven of the working equipment;

[0060] Operating mode one, the mode in which the main piston rod quickly extends;

[0061] The quick advance chamber communicates with the drive fluid station through the quick advance interface to inject drive fluid;

[0062] The return stroke chamber communicates with or is opened to the fluid circuit through the return stroke interface;

[0063] The main pressure chamber remains closed or its internal cavity size remains unchanged;

[0064] As the drive fluid is injected into the quick advance chamber, the space inside the chamber increases, and the drive fluid finally pushes the sub-piston to move forward along the main cylinder body; the movement of the sub-piston pushes the main piston to move forward synchronously, thereby driving the main piston rod to extend;

[0065] The extension speed of the main piston rod is V1, and the output thrust is F1;

[0066] Working mode 2, the main pressure output mode of the main piston rod;

[0067] The fast propulsion interface of the fast propulsion chamber is kept closed to hold the fluid medium in the fast propulsion chamber;

[0068] The return stroke chamber communicates with the fluid circuit through the return stroke interface or is open;

[0069] The main pressure chamber communicates with the drive fluid station through the main pressure fluid inlet to inject drive fluid;

[0070] As the drive fluid is injected into the main pressure chamber, the space inside becomes larger, and the drive fluid finally pushes the main piston to move forward along the main cylinder block; the movement of the main piston drives the main piston rod to extend;

[0071] The extension speed of the main piston rod is V2, and the output thrust is F2;

[0072] V1 > V2; F1 < F2;

[0073] Working mode 3, the fast extension mode of the auxiliary piston rod;

[0074] The return stroke chamber communicates with the drive fluid station through the return stroke interface to inject drive fluid;

[0075] The fast propulsion chamber communicates with the fluid circuit through the fast propulsion interface or is open;

[0076] The main pressure chamber is kept closed or the inner cavity size remains unchanged;

[0077] As the drive fluid is injected into the return stroke chamber, the space inside becomes larger, and the drive fluid finally pushes the main piston to move backward along the main cylinder block; the movement of the main piston pushes the auxiliary piston to move backward synchronously, thereby driving the auxiliary piston rod to extend;

[0078] The extension speed of the auxiliary piston rod is V3, and the output thrust is F3;

[0079] Working mode 4, the main pressure output mode of the auxiliary piston rod;

[0080] The return stroke interface of the return stroke chamber is kept closed to hold the fluid medium in the fast propulsion chamber;

[0081] The fast propulsion chamber communicates with the fluid circuit through the fast propulsion interface or is open;

[0082] The main pressure chamber communicates with the drive fluid station through the main pressure fluid inlet to inject drive fluid;

[0083] As the driving fluid is injected into the main pressure chamber, the space in the main pressure chamber becomes larger, and finally the driving fluid pushes the auxiliary piston to move backward along the main cylinder body; the movement of the auxiliary piston drives the auxiliary piston rod to extend.

[0084] The extending speed of the auxiliary piston rod is V4, and the output thrust is F4.

[0085] V3 > V4; F3 < F4.

[0086] The main piston rod and the auxiliary piston rod have opposite main pressure output directions.

[0087] In the fourth aspect of the present invention, an application of an energy-saving and efficiency-enhancing linear drive cylinder is provided. The energy-saving and efficiency-enhancing linear drive cylinder is a hydraulic cylinder, and the driving fluid is hydraulic oil.

[0088] The energy-saving and efficiency-enhancing linear drive cylinder is used as a hydraulic drive cylinder and is applied in a gantry shear, a hydraulic baler, a hydraulic crusher, a hydraulic forging machine, and a metal chip briquetting machine.

[0089] For the energy-saving and efficiency-enhancing linear drive cylinder and its usage method of the present invention, an auxiliary piston and an auxiliary piston rod are added in the cylinder body; a fast propulsion chamber is provided along the auxiliary piston and the auxiliary piston rod, or along the auxiliary piston rod. By reducing the area, the fast extension of the main piston rod can be achieved; and between the auxiliary piston and the main piston is the main pressure chamber, and the main pressure chamber communicates with the driving fluid station through the main pressure fluid inlet. By retaining the effective working area of the main pressure chamber, a relatively large working pressure can still be output when a large pressure needs to be provided.

[0090] For the energy-saving and efficiency-enhancing linear drive cylinder and its usage method of the present invention, through the improvement of the internal structure, the running speed during the idle or low-power stroke is increased, and the fluid consumption is reduced, thereby improving the operation efficiency of the equipment and reducing the power consumption of the driving fluid station. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] Figure 1 It is a schematic diagram of the overall structure of the energy-saving and efficiency-enhancing linear drive cylinder of the present invention;

[0092] Figure 2 It is a schematic diagram of the overall structure of the first embodiment of the energy-saving and efficiency-enhancing linear drive cylinder of the present invention;

[0093] Figure 3 It is a schematic diagram of the overall structure of the second embodiment of the energy-saving and efficiency-enhancing linear drive cylinder of the present invention;

[0094] Figure 4 It is a schematic diagram of the overall structure of the third embodiment of the energy-saving and efficiency-enhancing linear drive cylinder of the present invention;

[0095] Figure 5Schematic diagram of other setting modes of the main pressure fluid inlet of the present invention;

[0096] FIG. 6(a), FIG. 6(b), and FIG. 6(c) are schematic diagrams for marking the cross-sectional parameters of important components of the present invention;

[0097] Figure 7 Schematic diagram of the setting of the reserved main pressure chamber of the present invention;

[0098] Reference numerals: main cylinder block 101, front cover 102, rear cover 103; auxiliary cylinder block 104, third cylinder head 105;

[0099] main piston 201, main piston rod 202; auxiliary piston 301, auxiliary piston rod 302; quick push piston 303;

[0100] quick advance chamber 401, main pressure chamber 402, return stroke chamber 403; first rod chamber 404, second rod chamber 405;

[0101] reserved main pressure chamber 406;

[0102] quick advance interface 501, main pressure fluid inlet 502, return stroke interface 503;

[0103] first auxiliary interface 504, second auxiliary interface 505; guide channel 511, connecting rigid pipe 512, connecting interface 513. Detailed implementation manners

[0104] The following further elaborates on the detailed implementation manners of the present invention with reference to the accompanying drawings.

[0105] As Figure 1As shown in the figure, it is a schematic diagram of the overall structure of the energy-saving and efficiency-enhancing linear drive cylinder of the present invention; the main body of the energy-saving and efficiency-enhancing linear drive cylinder of the present invention is still a piston drive cylinder, and its structure is the same as that of the existing ordinary piston hydraulic cylinder or piston air cylinder, including 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 body 101 and is matched with the inner cavity of the main cylinder body 101, dividing the main cylinder body 101 into two independent and non-communicating chambers; the main piston rod 202 is located on the main piston 201, and the main piston rod 202 passes through the front cover 102, and the part of the main piston rod 202 outside the front cover 102 is a linear drive element and can be connected to the element to be driven of the target device; generally, flange mounting holes are provided on the front cover 102 for mounting on the frame of the target device to achieve fixation; a return interface 503 is provided 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 body 101, and the return cavity 403 can be connected to the drive fluid station through the return interface 503. By injecting fluid into the return cavity 403, the outer side surface of the main piston 201 can be pushed to move backward, so that the main piston rod 202 moves in the return stroke. Since the main piston rod 202 is located in the return cavity 403, the effective fluid pushing area (S3) of the return cavity 403 is smaller than the overall cross-sectional area of the main piston 201 (or the cross-sectional area of the inner cavity of the main cylinder body 101), so the return force (i.e., the reverse force) of the piston drive cylinder is smaller, but because the fluid injection cross-sectional area is also smaller, the corresponding return speed is faster.

[0106] The improvement of the energy-saving and efficiency-enhancing linear drive cylinder of the present invention is that a secondary piston 301 is further arranged in the main cylinder body 101, and the secondary piston 301 is located between the main piston 201 and the rear cover 103; the secondary piston 301 is embedded in the main cylinder body 101 and is matched with the inner cavity of the main cylinder body 101; a secondary piston rod 302 is provided on the secondary piston 301, and the secondary piston rod 302 passes through the rear cover 103 and part of it is outside the main cylinder body 101.

[0107] In the present invention, a rapid propulsion chamber 401 is provided along the auxiliary piston 301 and the auxiliary piston rod 302, or only along the auxiliary piston rod 302; the rapid propulsion chamber 401 is located inside or outside the main cylinder block 101; preferably, the maximum inner diameter of the rapid propulsion chamber 401 is less than or equal to the inner cavity diameter of the main cylinder block 101; the rapid propulsion chamber 401 is connected to a driving fluid station through a rapid propulsion interface 501; due to the presence of the auxiliary piston rod 302 in the rapid propulsion chamber 401, the effective fluid pushing area (S1) of the rapid propulsion chamber 401 is smaller than the cross-sectional area of the inner cavity of the main cylinder block 101.

[0108] A main pressure chamber 402 is formed along the main cylinder block 101 between the auxiliary piston 301 and the main piston 201; the main pressure chamber 402 is connected to a driving fluid station through 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 cavity of the main cylinder block 101.

[0109] S2 > S1; S2 > S3.

[0110] For the specific implementation manners of the rapid propulsion chamber 401 and the rapid propulsion interface 501, further reference may be made to Figures 2 - 4 as shown.

[0111] Embodiment 1, as Figure 2 shown;

[0112] The rapid propulsion chamber 401 is located between the auxiliary piston 301 and the rear cover 103, and the rapid propulsion interface 501 is preferably located on the rear cover 103; that is, the auxiliary piston 301 and the auxiliary piston rod 302 form another set of piston driving cylinders at the part of the main cylinder block 101 close to the rear cover 103.

[0113] The effective fluid pushing area (S1) of the rapid propulsion chamber 401 is the cross-sectional area of the auxiliary piston 301 minus the cross-sectional area of the auxiliary piston rod 302.

[0114] Embodiment 2, as Figure 3 shown; Embodiment 3, as Figure 4 shown;

[0115] The rapid propulsion chamber 401 is located outside the rear cover 103; outside the rear cover 103, an auxiliary cylinder block 104 is provided,

[0116] The part of the auxiliary piston rod 302 located outside the rear cylinder cover 103 is completely located inside the auxiliary cylinder block 104; the end of the auxiliary cylinder block 104 is closed by a third cylinder cover 105; the rapid propulsion chamber 401 is located inside the auxiliary cylinder block 104.

[0117] The rear portion of the secondary piston rod 302 is inside the secondary cylinder body 104 to form another set of linear drive cylinders. By injecting drive fluid into the fast propulsion chamber 401 , the end of the secondary piston rod 302 can be driven to push the secondary piston 301 .

[0118] like Figure 3 As shown, in the second embodiment, the linear drive cylinder formed by the rear part of the auxiliary piston rod 302 in the auxiliary cylinder body 104 is a plunger drive cylinder, and the auxiliary cylinder body 104 is the rapid propulsion chamber 401; the rapid propulsion interface 501 can be located on the third cylinder head 105 (as shown in the figure), or on the auxiliary cylinder body 104, or even on the rear cylinder head 103.

[0119] The effective fluid pushing area (S1) of the fast propulsion chamber 401 is the area where the tail of the secondary piston rod 302 contacts the fluid in the fast propulsion chamber 401 .

[0120] A first rod chamber 404 is formed between the secondary piston 301 and the rear cover 103 along the main cylinder body 101, and the first rod chamber 404 can be injected with a fluid medium or can be left open; when a closed fluid medium is provided in the first rod chamber 404, a first auxiliary interface 504 is provided on the rear cover 103 (as shown in the figure) or at the 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 provided with a closed fluid medium, that is, when it is kept open, the same first auxiliary interface 504 as mentioned above can also be provided to keep it in a normally open state, or a gap channel is left in the assembly of the rear cover 103 and the secondary piston rod 302, or a gap channel is left in the assembly of the rear cover 103 and the main cylinder body 101, so that the first rod chamber 404 can be communicated with the outside.

[0121] like Figure 4 As shown, in the third embodiment, a quick-push piston 303 is further provided at the end of the auxiliary piston rod 302; the quick-push piston 303 is embedded in the auxiliary cylinder body 104 and cooperates with the inner cavity of the auxiliary cylinder body 104; the linear drive cylinder formed by the rear part of the auxiliary piston rod 302 and the quick-push piston 303 in the auxiliary cylinder body 104 is a piston-type drive cylinder, and the quick-push chamber 401 is formed between the quick-push piston 303 and the third cylinder head 105 along the auxiliary cylinder body 104; the quick-push interface 501 can be located on the third cylinder head 105 (as shown in the figure), or at the end of the auxiliary cylinder body 104.

[0122] The effective fluid pushing area (S1) of the fast pushing chamber 401 is the area where the fast pushing piston 303 contacts the fluid in the fast pushing chamber 401 .

[0123] On the basis of Embodiment 2, Embodiment 3 is also provided with a first rod chamber 404 and a first auxiliary interface 504. At the same time, a second rod chamber 405 is formed between the quick push piston 303 and the rear cover 103 along the secondary cylinder block 104. The second rod chamber 405 can also be filled with a fluid medium or left open. When the second rod chamber 405 is filled with a closed fluid medium, a second auxiliary interface 505 is provided on the rear cover 103 or at the end of the secondary cylinder block 104 (as shown in the figure). The second rod chamber 405 communicates 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, that is, when it remains open, the same second auxiliary interface 505 can also be provided to keep it normally open, or a clearance channel is left in the assembly of the rear cover 103 and the secondary cylinder block 104 to allow the second rod chamber 405 to communicate with the outside. Both the second rod chamber 405 and the first rod chamber 404 are follow-up chambers, and they can be kept conducting or independent of each other.

[0124] According to the above embodiments, since the main pressure fluid inlet 502 needs to communicate with the main pressure chamber 402, there are a total of 3 positions where it can be set:

[0125] The setting method Ⅰ of the main pressure fluid inlet 502 is as Figure 5 shown. When the fluid filling position of the main pressure chamber 402 is fixed relative to the main cylinder block 101 each time, a first main pressure fluid interface is provided on the main cylinder block 101 as the main pressure fluid inlet 502. When the main pressure chamber 402 moves to the position where the first main pressure fluid interface is located, the driving fluid can be injected into the main pressure chamber 402 through the first main pressure fluid interface.

[0126] The setting method Ⅱ of the main pressure fluid inlet 502 is as Figure 5 shown. Since the main pressure chamber 402 is in contact with the main piston 201, a second main pressure fluid channel is provided along the main piston 201 and through the main piston rod 202 as the main pressure fluid inlet 502. 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 outside the front cover 102.

[0127] However, for setting method Ⅰ, it is required that the fluid filling position of the main pressure chamber 402 is fixed each time, otherwise multiple first main pressure fluid interfaces need to be provided along the main cylinder block 101.

[0128] For setting method Ⅱ, since the interface is located on the main piston rod 202, and the main piston rod 202 is often located at the operating part of the equipment, it is not convenient to install pipelines.

[0129] Therefore, the setting method III of the main pressure fluid inlet 502 is as follows Figures 1 - 4 As shown, since the auxiliary piston 301 also contacts the main pressure chamber 402, a third main pressure fluid passage is provided along the auxiliary piston 301 and through the auxiliary piston rod 302 as the main pressure fluid inlet 502

[0130] As Figure 2 shown, in the first embodiment, the main pressure fluid inlet 502 directly penetrates from the end of the auxiliary piston rod 302 to the inner end face of the auxiliary piston 301

[0131] As Figure 3 、 Figure 4As shown, in the second and third embodiments, since the end of the auxiliary piston rod 302 is wrapped and enclosed by the auxiliary cylinder block 104, a through-channel is still provided inside the auxiliary piston rod 302 and the auxiliary piston 301 as the main pressure fluid inlet 502. A connection channel is also provided between the end of the auxiliary piston rod 302 and the auxiliary cylinder block 104 or the third cylinder head 105. In the attached drawing embodiments, preferably, a connection interface 513 is provided on the third cylinder head 105, and the main pressure fluid inlet 502 inside the auxiliary piston rod 302 is connected to the connection interface 513 through a hose or a rigid pipe. In the attached drawing embodiments, preferably, a rigid connection pipe 512 is used for connection. The main pressure fluid inlet 502 inside the auxiliary piston rod 302 serves as a guiding channel 511. The rigid connection pipe 512 is inserted into the guiding channel 511, and a sliding seal structure is provided between the outer wall of the rigid connection pipe 512 and the inner wall of the guiding channel 511. The rigid connection pipe 512 is fixed on the third cylinder head 105. When the auxiliary piston rod 302 moves, the length of the rigid connection pipe 512 inside the guiding channel 511 will change, ensuring that the main pressure fluid inlet 502 communicates with the driving fluid station while achieving the change in distance. Since the rigid connection pipe 512 will occupy the fluid pushing area, in the second and third embodiments above, when calculating the effective fluid pushing area (S1) of the fast propulsion chamber 401, the outer wall area of the rigid connection pipe 512 needs to be subtracted. When the connection pipe is a hose, the hose is preset inside the fast propulsion chamber 401. When fluid is injected, the increased volume of the fast propulsion chamber 401 has nothing to do with the volume of the hose. Therefore, when calculating the effective fluid pushing area (S1) of the fast propulsion chamber 401, the cross-sectional area of the hose does not need to be subtracted. At the same time, when the volume of the fast propulsion chamber 401 changes, the size of the rigid connection pipe 512 inside the guiding channel 511 also changes accordingly, and the volume occupied by the fluid inside the guiding channel 511 will also change. When the main pressure chamber 402 is kept closed, some fluid will enter the guiding channel 511 or cause the volume of the main pressure chamber 402 to change. In the following calculation process, this situation is not considered too much.

[0132] Preferably, a part of the space needs to be reserved in the main pressure chamber 402. Correspondingly, a number of protrusions (which can be a protruding toroidal surface, or a protruding cylinder, or even protruding lines) can be provided on the inner surface of the main piston 201 or the inner surface of the auxiliary piston 301, so that the main piston 201 and the auxiliary piston 301 are always separated. When the driving fluid is injected into the main pressure chamber 402 and the main pressure chamber 402 expands, the protrusions no longer participate in the action and do not occupy the effective fluid pushing area of the main pressure chamber 402.

[0133] As shown in FIGS. 6(a), 6(b), and 6(c), the internal cross-sectional parameters related to the present invention are labeled as follows:

[0134] (1) A = the cross-sectional area of the inner cavity of the main cylinder block 101 = the cross-sectional area of the main piston 201 = the cross-sectional area of the auxiliary piston 301;

[0135] (2) B = the cross-sectional area of the main piston rod 202;

[0136] (3) C = the cross-sectional area of the auxiliary piston rod 302;

[0137] (4) D = the cross-sectional area of the inner cavity of the auxiliary cylinder block 104 = the cross-sectional area of the quick-push piston 303;

[0138] (5) E = the cross-sectional area of the outer diameter of the connecting pipe (connecting rigid pipe 512);

[0139] Among them, when the main pressure fluid inlet 502 adopts setting method I or setting method II, then E = 0.

[0140] The effective fluid pushing area S2 of the main pressure chamber 402 and the effective fluid pushing area S3 of the return stroke chamber 403 remain unchanged, that is, S2 = A, S3 = A - B; S2 > S3.

[0141] The effective fluid pushing area S1 of the quick propulsion chamber 401 varies with different specific implementation manners.

[0142] As shown in FIG. 6(a), in Embodiment 1: S1 = A - C; S2 > S1.

[0143] As shown in FIG. 6(b), in Embodiment 2: S1 = C - E; S2 > S1.

[0144] As shown in FIG. 6(c), in Embodiment 3: S1 = D - E; S2 > S1.

[0145] When the linear drive cylinder of the present invention is in use, preferably, the main cylinder block 101 is fixed on the frame of the target device, especially it can be fixed through the front cover 102, and then the end of the main piston rod 202 is connected to the working part of the device; the telescopic movement of the main piston rod 202 drives the relevant components of the device to work.

[0146] When the linear drive cylinder of the present invention is in use, it is necessary to connect a drive fluid station (hydraulic pump or air compressor), and set the output of the drive fluid station to be stable at an output flow rate of Q (m³ / s) and an output pressure of P (Pa).

[0147] The linear drive cylinder of the present invention has at least three relatively independent working modes (temporarily not considering the friction, resistance, etc. of each part):

[0148] Working mode 1, fast extension mode;

[0149] The fast propulsion chamber 401 communicates with the drive fluid station through the fast propulsion interface 501, and drive fluid is injected;

[0150] The return stroke chamber 403 communicates with the fluid circuit through the return stroke interface 503, or is open;

[0151] The main pressure fluid inlet 502 of the main pressure chamber 402 remains closed, or is open.

[0152] The auxiliary piston 301, or the auxiliary piston rod 302, or the fast push piston 303 is pushed by the drive fluid in the fast propulsion chamber 401, so that the auxiliary piston 301 moves forward along the main cylinder block 101; the movement of the auxiliary piston 301 pushes the main piston 201 to move forward synchronously (by pushing through mutual contact, or by the fluid medium in the closed main pressure chamber 402), and finally pushes the main piston rod 202 to extend.

[0153] During this process, the fluid medium in the return stroke chamber 403 is discharged.

[0154] When the auxiliary piston 301 directly pushes the main piston 201 to move forward, at this time, the main pressure chamber 402 can remain open or communicate with the fluid circuit; or when the main pressure chamber 402 maintains a smaller size, the main pressure chamber 402 is closed, and when the fluid medium in the main pressure chamber 402 is hydraulic oil, there is almost no further compression space in the main pressure chamber 402; therefore, the forward movement distance of the auxiliary piston 301 is the same as that of the main piston 201.

[0155] When the main pressure chamber 402 maintains a smaller size, the main pressure chamber 402 is closed, but the fluid medium in the main pressure chamber 402 is gas, due to the strong volume compressibility of the gas, the main pressure chamber 402 will be compressed when it is stressed until it reaches equilibrium, so the forward movement distance of the main piston 201 will be less than that of the auxiliary piston 301 due to the influence of the front-end resistance. The analysis of this process needs to be combined with specific external conditions and will not be elaborated further.

[0156] The forward movement distances of the main piston rod 202, the main piston 201, the auxiliary piston 301, and the auxiliary piston rod 302 are L1; therefore, in working mode 1 of the fast extension mode, the output parameters of the main piston rod 202 are:

[0157] Operating speed V1 = Q ÷ S1;

[0158] Extension time T1 = L1 ÷ V1 = L1 × S1 ÷ Q;

[0159] Output thrust F1 = P × S1;

[0160] The output fluid volume M1 of the driving fluid station is M1 = L1 × S1.

[0161] Working mode 2, main pressure mode; when the main piston rod 202 needs to output a greater thrust, switch to this working mode 2.

[0162] The fast propulsion interface 501 of the fast propulsion chamber 401 is kept closed to hold the fluid medium in the fast propulsion chamber 401.

[0163] The return stroke chamber 403 communicates with the fluid circuit through the return stroke interface 503 or is open.

[0164] The main pressure chamber 402 communicates with the driving fluid station through the main pressure fluid inlet 502 to inject driving fluid.

[0165] The driving fluid is directly injected into the main pressure chamber 402 to apply a thrust force to the main piston 201 and the auxiliary piston 301 simultaneously.

[0166] Since the fast propulsion chamber 401 is kept closed, when the fluid medium in the fast propulsion chamber 401 is liquid, there is almost no further compression space in the fast propulsion chamber 401, so the auxiliary piston 301 will remain at the position at the end of working mode 1.

[0167] When the fluid medium in the fast propulsion chamber 401 is gas, due to the strong volume compressibility of the gas, the fast propulsion chamber 401 will be affected by the pressure in the main pressure chamber 402 and be compressed until it reaches equilibrium, so the auxiliary piston 301 will shift slightly backward relative to the position at the end of working mode 1. The analysis of this process will not be elaborated here.

[0168] As the driving fluid is injected into the main pressure chamber 402, the main piston 201 is forced to move forward with the main piston rod 202 by a distance of L2; therefore, in working mode 2 of the main pressure mode, the output parameters of the main piston rod 202 are:

[0169] Operating speed V2 = Q ÷ S2;

[0170] Extension time T2 = L2 ÷ V2 = L2 × S2 ÷ Q;

[0171] Output thrust F2 = P × S2;

[0172] The output fluid volume M2 of the driving fluid station is M2 = L2 × S2.

[0173] In summary, for the energy-saving and efficiency-enhancing linear drive cylinder of the present invention, without considering the switching time between working mode 1 and working mode 2, the extension time of the entire main piston rod 202 is T:

[0174] T = T1+T2 = L1×S1÷Q + L2×S2÷Q;

[0175] And the total fluid output of the drive fluid station is M:

[0176] M = M1+M2 = L1×S1 + L2×S2.

[0177] If an existing linear drive cylinder is adopted: the extension speed V' of the piston rod = Q÷S2;

[0178] The extension time T' of the entire piston rod = (L1+L2)÷V' = L1×S2÷Q + L2×S2÷Q;

[0179] And the total fluid output M' of the drive fluid station = L1×S2 + L2×S2.

[0180] The energy-saving and efficiency-enhancing linear drive cylinder of the present invention, compared with the existing linear drive cylinder,

[0181] The saved extension time ΔT = T'-T = L1×S2÷Q - L1×S1÷Q = L1×(S2-S1)÷Q;

[0182] The saved amount of drive fluid injected ΔM = M'-M = L1×S2 - L1×S1 = L1×(S2-S1);

[0183] That is, when the moving distance L1 in working mode 1 (reactive or low-power stroke) of the fast extension mode is longer and the effective fluid pushing area S1 of the fast propulsion chamber 401 is smaller, the more the corresponding saved extension time, and the more the saved amount of drive fluid injected. The energy-saving and efficiency-enhancing effects of the energy-saving and efficiency-enhancing linear drive cylinder of the present invention are more obvious.

[0184] During the above process, the drive fluid stations connected to the two working processes of the energy-saving and efficiency-enhancing linear drive cylinder of the present invention are the same; however, in order to further improve efficiency, since the demand for working thrust in the first working mode of the fast extension mode is generally low, or even only an idle stroke, a first drive fluid station with a large output flow rate and a low output pressure can be used and connected to the fast propulsion chamber 401 to perform fast propulsion output in the first working mode. When entering the second working mode of the main pressure mode, since a large working thrust is required, a second drive fluid station with a high-pressure output can be used and connected to the main pressure chamber 402 to perform large-thrust output in the second working mode. By configuring two drive fluid stations with different output performances, the working efficiency can be further improved, and it is expected to reduce the comprehensive energy consumption of the drive fluid stations, as well as the procurement configuration cost and maintenance cost (the two drive fluid stations work alternately, with a longer idle time and more heat dissipation time, and the service life can be correspondingly extended).

[0185] For the energy-saving and efficiency-enhancing linear drive cylinder of the present invention, when the L1 distance in each first working mode is fixed, the starting position of the main pressure chamber 402 on the main cylinder body 101 is also fixed, and the main pressure fluid inlet 502 can adopt the setting method I to set the first main pressure fluid interface on the main cylinder body 101.

[0186] When the linear drive cylinder of the present invention is in use, when transitioning from the first working mode to the second working mode, if the main pressure chamber 402 between the auxiliary piston 301 and the main piston 201 is too small, or even completely absent, it will often affect the generation of the main thrust F2 in the subsequent main pressure process. Therefore, when the required working thrust is small at the beginning or during the first working mode (i.e., the working resistance is small), a piston separation process can be set to briefly connect the main pressure fluid inlet 502 with the drive fluid station to inject drive fluid and form the main pressure chamber 402. Or, a support (the support can be a convex toroidal surface, or a convex cylinder, or even a convex texture; the support can be formed by milling to remove the material on the piston end face; the support can also be formed by installing a convex object on the piston end face) is provided between the auxiliary piston 301 and the main piston 201 to keep the two separated at least at a certain distance, so that the main pressure chamber 402 always exists.

[0187] That is, as Figure 7As shown, a recess is provided at the end of the auxiliary piston 301 to form a reserved main pressure chamber 406. A support body is formed around the reserved main pressure chamber 406. When the main pressure fluid inlet 502 is open, the support body around the reserved main pressure chamber 406 can abut against the main piston 201, thereby directly pushing the main piston 201; the main pressure fluid inlet 502 preferably adopts setting method III, and a third main pressure fluid channel is provided in the auxiliary piston 301 and the auxiliary piston rod 302 as the main pressure fluid inlet 502; at this time, the contact area S4 between the reserved main pressure chamber 406 and the main piston 201 is greater than or equal to the cross-sectional area S1 of the rapid propulsion chamber 3.

[0188] Further, based on the above embodiment, the recess can also be provided at the end of the main piston 201; the recess may not be completely located in the middle of the piston, such as being biased to one side; the recess may not completely exist in the form of a circular recess, such as a rectangle, an ellipse, or even an irregular shape; the recess can also communicate with the inner wall of the main cylinder block 101, so that the main pressure fluid inlet 502 is set in setting method I, that is, a first main pressure fluid interface is provided on the main cylinder block 101, and driving fluid is injected into the reserved main pressure chamber 406 of the recess through the first main pressure fluid interface.

[0189] That is, when the linear drive cylinder of the present invention is applied to fields where the output pressure requirement is continuously increasing, such as a hydraulic baler (a horizontal hydraulic full-automatic baler with Chinese Patent Publication No. CN1765617A), the linear drive cylinder of the present invention first operates in the rapid extension process of working mode 1, and the auxiliary piston 301 pushes the main piston 201 forward through the support body around the reserved main pressure chamber 406; when transitioning from working mode 1 to working mode 2, the driving fluid directly enters the reserved main pressure chamber 406 through the main pressure fluid inlet 502 of the third main pressure fluid channel. At this time, since S4≥S1, an output thrust not less than the output thrust F1 in the rapid extension process of working mode 1 will also be generated instantaneously, so that the main piston 201 can be directly pushed. Once pushed open, the main pressure chamber 402 is formed, and the output thrust is also increased to F2, entering the main pressure process of working mode 2.

[0190] The main pressure fluid inlet 502 preferably adopts setting method III (the third main pressure fluid channel) in the above process, which can ensure that the driving fluid can smoothly enter the reserved main pressure chamber 406 and can also maximize the area of the main pressure chamber 402 on the side of the main piston 201.

[0191] The energy-saving and efficiency-enhancing linear drive cylinder of the present invention can be used as a hydraulic drive cylinder and applied in a gantry shear (replacing the main pressure cylinder (2), synchronous cylinder (3), etc. in the hydraulic synchronous gantry shear with the Chinese Patent Publication No. CN205362819U), a hydraulic baler (replacing the door cover cylinder (21), main pressure cylinder (301), especially the side pressure cylinder (41), etc. in a hydraulic baler with the Chinese Patent Publication No. CN110281566A), a hydraulic crusher (replacing the ramming cylinder (1) in the reinforced concrete beam pre-crushing device with the Chinese Patent Publication No. CN107008560A), a metal chip briquetting machine (replacing the main pressure cylinder (2) in the extrusion molding die of a horizontal metal chip briquetting machine with the Chinese Patent Publication No. CN202011169U), and a hydraulic forging machine).

[0192] In the above process, 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-enhancing linear drive cylinder of the present invention. The fast extension mode and the main pressure mode can be reasonably arranged according to the specific equipment usage requirements. The two working processes can even be alternated, such as operating alternately 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", etc.

[0193] When the main piston rod 202 finishes its extension work and needs to retract to the initial position, the energy-saving and efficiency-enhancing linear drive cylinder of the present invention can enter the third working mode, the reset mode.

[0194] The fast propulsion chamber 401 communicates with or is open to the fluid circuit through the fast propulsion interface 501.

[0195] The main pressure chamber 402 communicates with or is open to the fluid circuit through the main pressure fluid inlet 502.

[0196] The return stroke chamber 403 communicates with the drive fluid station through the return stroke interface 503, and drive fluid is injected.

[0197] The drive fluid is directly injected into the return stroke chamber 403 to apply a thrust to the main piston 201, causing it to drive the main piston rod 202 to retract. During this process, the fluid media in the fast propulsion chamber 401 and the main pressure chamber 402 are discharged, and the auxiliary piston 301 and the auxiliary piston rod 302 retract and reset.

[0198] The third working mode of the reset mode of the energy-saving and efficiency-enhancing linear drive cylinder of the present invention is consistent with the performance of the existing linear drive cylinder.

[0199] In Embodiment 1 of the energy-saving and efficiency-enhancing linear drive cylinder of the present invention, since the secondary piston rod 302 is also located outside the main cylinder block 101, the energy-saving and efficiency-enhancing linear drive cylinder of the present invention under Embodiment 1 can also be used as a linear drive cylinder with bidirectional output. As Figure 2 shown, when a fast extension mode is required, drive fluid is injected into the fast propulsion chamber 401 through the fast propulsion interface 501, or drive fluid is injected into the return chamber 403 through the return interface 503, while the main pressure chamber 402 remains closed or has a fixed size. When the main pressure mode is required, the interface away from the direction of the extended piston rod is closed, and the other interface is opened; that is, when the main piston rod 202 is required to perform main pressure output, the fast propulsion interface 501 is closed, and the return interface 503 is opened; when the secondary piston rod 302 performs main pressure output, the return interface 503 is closed, and the fast propulsion interface 501 is opened; at this time, drive fluid can be injected into the main pressure fluid inlet 502.

[0200] The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. Energy-saving and efficiency-enhancing linear drive cylinder, comprising a main cylinder body, a front cover, and a rear cover; a main piston and a main piston rod are arranged inside the main cylinder body; The main piston rod is located on the main piston, and the main piston rod passes through the front cover and extends outside the main cylinder body; the main piston and the main piston rod form a piston-type linear drive cylinder inside the main cylinder body; A return stroke cavity is formed along the main cylinder body between the main piston and the front cover, and the return stroke cavity communicates with the outside through a return stroke interface; the effective fluid pushing area of the return stroke cavity is S3; It is characterized in that A secondary piston is further arranged inside the main cylinder body, and the secondary piston is located between the main piston and the rear cover; The secondary piston is fitted inside the main cylinder body and is matched with the inner cavity of the main cylinder body; A secondary piston rod is arranged on the secondary piston, the secondary piston rod passes through the rear cover, and part of it is located outside the main cylinder body; A quick propulsion cavity is arranged along the secondary piston and the secondary piston rod, or along the secondary piston rod; the quick propulsion cavity is located inside the main cylinder body or outside the main cylinder body; The quick propulsion cavity is connected to an external driving fluid station through a quick propulsion interface; The effective fluid pushing area of the quick propulsion cavity is S1; A main pressure cavity is formed along the main cylinder body between the secondary piston and the main piston; The main pressure cavity is connected to an external driving fluid station through a main pressure fluid inlet; The effective fluid pushing area of the main pressure cavity is S2; S2 > S1; S2 > S3.

2. The energy-saving and efficiency-enhancing linear drive cylinder according to claim 1, characterized in that, The main pressure cavity moves along the inner cavity of the main cylinder body; The main pressure fluid inlet is located inside the main piston and the main piston rod, or inside the secondary piston and the secondary piston rod; One end of the main pressure fluid inlet communicates with the main pressure cavity through an opening on the main piston or the secondary piston; The opening at the other end of the main pressure fluid inlet is located on the rod body or end face of the main piston rod or the secondary piston rod outside the main cylinder body.

3. The energy-saving and efficiency-enhancing linear drive cylinder according to claim 1, wherein The main pressure fluid inlet is located on the main cylinder body; When the main pressure cavity moves along the inner cavity of the main cylinder body to the main pressure fluid inlet, driving fluid can be injected into the main pressure cavity through the main pressure fluid inlet.

4. The energy-saving and efficiency-increasing linear drive cylinder according to claim 1, characterized in that, A support is arranged between the secondary piston and the main piston; the main pressure cavity always exists between the secondary piston and the main piston.

5. Method of using an energy-saving and efficiency-enhancing linear drive cylinder, characterized in that, Adopt the energy-saving and efficiency-enhancing linear drive cylinder according to any one of claims 1-4; the main piston rod includes two extended working modes: Working mode one, quick extension mode; The quick propulsion cavity communicates with the driving fluid station through the quick propulsion interface, and driving fluid is injected; The return stroke cavity communicates with a fluid circuit through the return stroke interface or is open; The main pressure cavity remains closed or the inner cavity size remains unchanged; As the driving fluid is injected, the space in the quick propulsion cavity becomes larger, and the driving fluid finally pushes the secondary piston to move forward along the main cylinder body; the movement of the secondary piston drives the main piston to move forward synchronously, thereby driving the main piston rod to extend; The extension speed of the main piston rod is V1, and the output thrust is F1; Working mode two, main pressure mode; The quick propulsion interface of the quick propulsion cavity remains closed to hold the fluid medium in the quick propulsion cavity; The return cavity communicates with the fluid circuit through the return interface or is open. The main pressure cavity communicates with the drive fluid station through the main pressure fluid inlet to inject drive fluid. As the drive fluid is injected into the main pressure cavity, the space inside becomes larger, and the drive fluid finally pushes the main piston to move forward along the main cylinder block. The movement of the main piston drives the main piston rod to extend. The extension speed of the main piston rod is V2, and the output thrust is F2. V1 > V2; F1 < F2.

6. The method of using the energy-saving and efficiency-enhancing linear drive cylinder according to claim 5, characterized in that, The drive fluid station connected to the fast propulsion cavity in Working Mode 1 of the fast extension mode of the energy-saving and efficiency-enhancing linear drive cylinder is the same drive fluid station as the drive fluid station connected to the main pressure cavity in Working Mode 2 of the main pressure mode, with the same rated output fluid pressure and fluid velocity.

7. The method of using the energy-saving and efficiency-increasing linear drive cylinder according to claim 5, characterized in that, The drive fluid station connected to the fast propulsion cavity in Working Mode 1 of the fast extension mode of the energy-saving and efficiency-enhancing linear drive cylinder is the first drive fluid station. The drive fluid station connected to the main pressure cavity in Working Mode 2 of the main pressure mode is the second drive 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 usage method of the energy-saving and efficiency-enhancing linear drive cylinder according to claim 5, characterized in that, When the main piston rod retracts and returns to its original position, it operates in Working Mode 3, the reset mode. The fast propulsion cavity and the main pressure cavity communicate with the fluid circuit or are open through their respective interfaces, either separately or simultaneously, to discharge the fluid media in the fast propulsion cavity and the main pressure cavity. The return cavity communicates with the drive fluid station through the return interface to inject drive fluid. As the drive fluid is injected into the return cavity, the space inside becomes larger, and the drive fluid pushes the rod side of the main piston to move backward, thereby driving the main piston rod to retract and return to its original position. The main piston pushes the sub-piston to move backward to discharge the fluid media in the fast propulsion cavity for resetting.

9. Two-way output method of a linear drive cylinder for energy saving and efficiency improvement, characterized in that, An energy-saving and efficiency-enhancing linear drive cylinder as described in any one of claims 1 - 4 is adopted. The fast propulsion cavity is formed between the sub-piston and the rear cover along the main cylinder block. The fast propulsion interface is located on the rear cover or on the cylinder block of the main cylinder block near the rear cover. The sub-piston and the sub-piston rod form another piston-type linear drive cylinder at the part of the main cylinder block near the rear cover. The part of the main piston rod outside the main cylinder block and the part of the sub-piston rod outside the main cylinder block are respectively connected to the components to be driven of the working equipment. Working Mode 1, the fast extension mode of the main piston rod. The fast propulsion cavity communicates with the drive fluid station through the fast propulsion interface to inject drive fluid. The return cavity communicates with the fluid circuit through the return interface or is open. The main pressure cavity remains closed or its inner cavity size remains unchanged. The space in the quick - advance cavity becomes larger as the driving fluid is injected. The driving fluid finally pushes the auxiliary piston to move forward along the main cylinder block. The movement of the auxiliary piston pushes the main piston to move forward synchronously, thereby driving the main piston rod to extend. The extending speed of the main piston rod is V1, and the output thrust is F1. Working mode two, the main - pressure output mode of the main piston rod. The quick - advance interface of the quick - advance cavity remains closed to hold the fluid medium in the quick - advance cavity. The return cavity communicates with the fluid circuit through the return interface or is open. The main - pressure cavity communicates with the driving - fluid station through the main - pressure fluid inlet to inject the driving fluid. The space in the main - pressure cavity becomes larger as the driving fluid is injected. The driving fluid finally pushes the main piston to move forward along the main cylinder block. The movement of the main piston drives the main piston rod to extend. The extending speed of the main piston rod is V2, and the output thrust is F2. V1 > V2; F1 < F2. Working mode three, the quick - extension mode of the auxiliary piston rod. The return cavity communicates with the driving - fluid station through the return interface to inject the driving fluid. The quick - advance cavity communicates with the fluid circuit through the quick - advance interface or is open. The main - pressure cavity remains closed or its inner - cavity size remains unchanged. The space in the return cavity becomes larger as the driving fluid is injected. The driving fluid finally pushes the main piston to move backward along the main cylinder block. The movement of the main piston pushes the auxiliary piston to move backward synchronously, thereby driving the auxiliary piston rod to extend. The extending speed of the auxiliary piston rod is V3, and the output thrust is F3. Working mode four, the main - pressure output mode of the auxiliary piston rod. The return interface of the return cavity remains closed to hold the fluid medium in the quick - advance cavity. The quick - advance cavity communicates with the fluid circuit through the quick - advance interface or is open. The main - pressure cavity communicates with the driving - fluid station through the main - pressure fluid inlet to inject the driving fluid. The space in the main - pressure cavity becomes larger as the driving fluid is injected. The driving fluid finally pushes the auxiliary piston to move backward along the main cylinder block. The movement of the auxiliary piston drives the auxiliary piston rod to extend. The extending speed of the auxiliary piston rod is V4, and the output thrust is F4. V3 > V4; F3 < F4. The main - pressure output directions of the main piston rod and the auxiliary piston rod are opposite.

10. Application of a linear drive cylinder for energy conservation and efficiency improvement, characterized in that, Adopt the energy - saving and efficiency - enhancing linear drive cylinder according to any one of claims 1 - 4. The energy - saving and efficiency - enhancing linear drive cylinder is a hydraulic cylinder, and the driving fluid is hydraulic oil. The energy - saving and efficiency - enhancing linear drive cylinder is used as a hydraulic drive cylinder and is applied in a gantry shear, a hydraulic baler, a hydraulic crusher, a hydraulic forging machine, and a metal - chip briquetting machine.

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