A two-stroke multi-stage booster cylinder

Abstract

The present invention relates to a two-stroke multi-stage boosting cylinder. The cylinder includes a piston rod and a front cylinder body, an intermediate cylinder body and a rear cylinder body connected together in sequence through end covers. The piston rod includes a front rod, a sleeve and a connecting rod. A front piston is provided in the front cylinder body, an intermediate piston is provided in the intermediate cylinder body, and a rear piston is provided in the rear cylinder body. When the two-stroke multi-stage boosting cylinder provided by the present invention is in action, first the intermediate piston in the intermediate cylinder body moves forward, pushing the sleeve forward, and then driving the front rod forward to complete the first stroke. While the front rod completes the first stroke, the sleeve is connected to the connecting rod through a detachable connecting mechanism. At this time, air is taken into the front cylinder body and the rear cylinder body, and the front piston and the rear piston move forward, and at the same time drive the front rod, the sleeve and the connecting rod forward to complete the second stroke. The two-stroke multi-stage boosting cylinder provided by the present invention can simultaneously realize the action and boosting effect of the two strokes, meeting the requirements of automobile body welding.

Description

Technical Field

[0001] The present invention relates to the technical field of cylinders, and in particular to a two-stroke multi-stage supercharged cylinder. Background Art

[0002] Spot welding for automotive assembly requires a cylinder with a wide range of openings. The cylinder must be able to move the welding clamp freely through the gap between the assembly clamp and the automotive component when the opening is large, while also ensuring stable welding when the opening is small. The cylinder's movement must provide a time gap for the clamp opening to change, while also ensuring a high frequency of spot welding and reducing production costs. Therefore, a two-stroke, multi-stage pressurized cylinder is crucial. Summary of the Invention

[0003] In response to the technical problems existing in the prior art, the present invention provides a two-stroke multi-stage booster cylinder, which can stop when completing the first stroke, providing a time gap for the welding clamp to open to a large opening, while ensuring its high-frequency spot welding operation when the opening is small.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: a two-stroke multi-stage booster cylinder, comprising a piston rod and a front cylinder body, an intermediate cylinder body and a rear cylinder body connected together through end covers in sequence, the piston rod comprising a front rod, a sleeve and a connecting rod; a front piston is provided in the front cylinder body, an intermediate piston is provided in the intermediate cylinder body, and a rear piston is provided in the rear cylinder body; the front rod is located in the front cylinder body and passes through the front end cover of the front cylinder body, the sleeve is located in the intermediate cylinder body and passes through the end cover and is connected to the tail of the front rod, the front piston is fixedly arranged on the front rod, the connecting rod The connecting rod passes through the front end cover of the rear cylinder body and extends into the sleeve. The connecting rod and the sleeve are connected together by a detachable connecting mechanism. The detachable connecting mechanism is in a detached state when the piston rod moves in the first stroke, and is in a connected state when the piston rod moves in the second stroke. The intermediate piston is sleeved on the connecting rod and can move relative to the connecting rod. The intermediate piston is located at the rear end of the sleeve and pushes the sleeve to move forward. The rear piston is fixed on the connecting rod; the front cylinder body, the intermediate cylinder body and the rear cylinder body are all provided with an air inlet and an air outlet.

[0005] The beneficial effects of the present invention are as follows: when the two-stroke multi-stage booster cylinder provided by the present invention is in action, the intermediate piston in the intermediate cylinder body moves forward first, pushing the sleeve to move forward, and then driving the front rod to move forward to complete the first stroke. While the front rod completes the first stroke, the sleeve is connected to the connecting rod through a detachable connecting mechanism. At this time, air is taken into the front cylinder body and the rear cylinder body, and the front piston and the rear piston move forward, simultaneously driving the front rod, the sleeve and the connecting rod to move forward to complete the second stroke. The two-stroke multi-stage booster cylinder provided by the present invention can simultaneously realize the actions and boosting effects of the two strokes, meeting the needs of automobile welding.

[0006] Preferably, the detachable connecting mechanism includes a fixing hole arranged on the sleeve, a marble arranged in the fixing hole, a slot arranged on the connecting rod, and a marble pressing device. The sleeve drives the marble to move under the action of the intermediate piston. When the sleeve completes the first stroke, the marble enters the slot and is pressed by the marble pressing device; when the sleeve returns to start the second stroke, the marble pressing device releases the marble, and the marble is driven by the sleeve to detach from the slot.

[0007] Preferably, the inner side of the fixing hole is a cylindrical structure, and the outer side is a spherical structure. The fixing hole and the marble are gap-fitted, and the opening diameter of the upper end of the spherical structure is less than the diameter of the marble.

[0008] Preferably, the height of the fixing hole is 1 / 2 of the diameter of the marble, and the height of the cylindrical structure is equal to the thickness of the sleeve and equal to 1 / 4 of the diameter of the marble.

[0009] Preferably, the connecting rod includes a first body with a larger diameter at the front end and a second body with a smaller diameter at the rear end, and a slot is formed between the first body and the second body.

[0010] Specifically, the intermediate cylinder body includes intermediate cylinder body one and intermediate cylinder body two connected together by end covers; the ball pressing device is located in intermediate cylinder body one, and the intermediate piston is located in intermediate cylinder body two. The ball pressing device includes a piston sleeve, and the piston sleeve is arranged on the sleeve and the front end of the piston sleeve is pressed against the end cover through a spring. The tail of the piston sleeve is provided with a slope, and a sealed cavity is formed between the outside of the tail of the piston sleeve and the end cover. When air is inflated into it, the spring is compressed.

[0011] Preferably, the connecting rod is a hollow structure, and a through hole is provided at the connection between the sleeve and the front rod. The tail of the connecting rod extends out of the rear piston, and the gas in the front cylinder body can enter the rear cylinder body through the sleeve and the connecting rod to push the rear piston to move forward. This arrangement can achieve the effect of multi-stage supercharging on the one hand, and on the other hand, it can reduce the number of air holes opened, facilitate gas path integration, and make the structure of the entire device more reasonable.

[0012] Preferably, the sleeve is connected to the front rod through a front shaft, the front shaft includes a solid small head and a hollow big head, the solid small head is provided with an external thread, the front rod is fixed to the solid small head through a thread, the hollow big head is provided with an external thread, the sleeve is fixed to the hollow big head through a thread, and the through hole is provided at the connection between the solid small head and the hollow big head.

[0013] Preferably, it also includes a rear axle, which is a hollow structure and includes a body of a hollow cylindrical structure. The tail of the body of the cylindrical structure is provided with an outward flange, the connecting rod is installed on the rear axle through a thread, the rear piston is installed on the rear axle, and the end of the rear axle is located on the rear side of the rear piston.

[0014] The installation of the front rod, the sleeve and the connecting rod is achieved through the front axle and the rear axle, and the disassembly and installation are convenient.

[0015] Preferably, multiple booster cylinders are provided between the intermediate cylinder and the rear cylinder, each of which is provided with a piston. The connecting rod passes through each booster cylinder in sequence, and the piston is fixed to the connecting rod. Multiple pistons are connected in series on the connecting rod to increase the number of booster pistons during operation, thereby increasing the working thrust of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0017] Figure 2 is a cross-sectional view of the present invention;

[0018] Figure 3 It is a schematic diagram of the explosion structure of the present invention;

[0019] Figure 4 Schematic diagram of the structure of the front axle;

[0020] Figure 5 It is a structural diagram of the cylinder in the initial state;

[0021] Figure 6 This is a structural diagram of the cylinder when it extends into the first stroke;

[0022] Figure 7 This is a structural diagram of the cylinder extending into the second stroke;

[0023] Figure 8 It is a structural diagram of the cylinder when it retracts to the second stroke;

[0024] Figure 9 It is a structural diagram of the cylinder when it retracts to the first stroke;

[0025] Figure 10 This is a schematic diagram of the intake structure of the piston sleeve;

[0026] Figure 11 This is a structural diagram of the tail of the cylinder when two pistons are connected in series;

[0027] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0028] 1 front cylinder body, 2 intermediate cylinder body, 3 rear cylinder body, 4 front rod, 5 sleeve, 6 connecting rod, 8 marble pressing device, 9 end cover, 10 front piston, 11 intermediate piston, 12 rear piston, 13 front axle, 14 rear axle, 21 intermediate cylinder body 1, 22 intermediate cylinder body 2, 71 fixing hole, 72 marble, 73 slot, 81 piston sleeve, 82 spring slot, 83 spring, 84 inclined surface, 85 sealing chamber, 131 through hole. DETAILED DESCRIPTION

[0029] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0030] like Figure 1-3 As shown, a two-stroke multi-stage booster cylinder includes a piston rod and a front cylinder body 1, an intermediate cylinder body 2 and a rear cylinder body 3 connected together through an end cover 9 in sequence. The piston rod includes a front rod 4, a sleeve 5 and a connecting rod 6; a front piston 10 is provided in the front cylinder body 1, an intermediate piston 11 is provided in the intermediate cylinder body 2, and a rear piston 12 is provided in the rear cylinder body 3; the front rod 4 is located in the front cylinder body 1 and passes through the front end cover of the front cylinder body 1, the sleeve 5 is located in the intermediate cylinder body 2 and passes through the end cover to be connected to the tail of the front rod 4, the front piston 10 is fixedly provided on the front rod 4, the connecting rod 6 passes through the front end cover of the rear cylinder body and extends into the sleeve 5, and the connecting rod 6 is connected to the sleeve 5. They are connected together by a detachable connecting mechanism, which is in a detached state when the piston rod moves in a first stroke, and in a connected state when the piston rod moves in a second stroke. The intermediate piston 11 is sleeved on the connecting rod 6 and can move relative to the connecting rod 6. The intermediate piston 11 is located at the rear end of the sleeve 5 and pushes the sleeve 5 to move forward. The rear piston 12 is fixed on the connecting rod 6; the front cylinder body 1, the intermediate cylinder body 2 and the rear cylinder body 3 are all provided with air inlets and air outlets as needed. The air inlets and air outlets can also use the same air hole as needed. The air hole can be opened on the end cover and connected to different cylinder bodies as needed.

[0031] When the two-stroke multi-stage booster cylinder provided in this embodiment is in operation, the intermediate piston 11 in the intermediate cylinder body 2 first moves forward, pushing the sleeve 5 forward, and then driving the front rod 4 to move forward to complete the first stroke. While the front rod 4 completes the first stroke, the sleeve 5 is connected to the connecting rod 6 through a detachable connecting mechanism. At this time, air is taken into the front cylinder body 1 and the rear cylinder body 3, and the front piston 10 and the rear piston 12 move forward, while driving the front rod 4, the sleeve 5 and the connecting rod 6 to move forward to complete the second stroke.

[0032] like Figure 2 、 3As shown, the detachable connection mechanism includes a fixing hole 71 provided on the sleeve 5, a marble 72 provided in the fixing hole 71, a slot 73 provided on the connecting rod 6, and a marble pressing device 8. The sleeve 5 drives the marble 72 to move under the action of the intermediate piston. When the sleeve 5 completes the first stroke, the marble 72 enters the slot 73 and is pressed by the marble pressing device 8. When the sleeve 5 returns to start the second stroke, the marble pressing device 8 releases the marble 72, and the marble 72 is driven by the sleeve 5 to disengage the slot 73, thereby achieving the separation of the sleeve 5 and the connecting rod 6. A plurality of fixing holes 71 can be provided along the circumference, such as six.

[0033] Specifically, the inner side of the fixing hole 71 is cylindrical, and the outer side is spherical. The fixing hole 71 and the marble 72 are loosely matched, and the opening diameter of the upper end of the spherical structure is smaller than the diameter of the marble 72. This arrangement ensures that the marble 72 cannot escape from the fixing hole 71 on the sleeve 5, but can still be exposed from the upper end of the fixing hole 71 to push the marble pressing device 8.

[0034] More specifically, we set the height of the fixing hole 71 to 1 / 2 the diameter of the marble 72 , the height of the cylindrical structure is equal to the thickness of the sleeve 5 , the height of the spherical structure is equal to 1 / 4 the diameter of the marble 72 .

[0035] In this embodiment, the connecting rod 6 includes a first body with a larger diameter at the front end and a second body with a smaller diameter at the rear end, and the diameters of the first body and the second body form a slot 73. More specifically, the depth of the slot 73 can be set to 1 / 4 of the diameter of the ball 72, or the surface of the slot 73 close to the second body can be set to an inclined surface, that is, a smooth transition between the second body and the first body, to ensure that the ball 72 can be smoothly brought out by the sleeve 5 and enter between the sleeve 5 fixing hole 71 and the connecting rod 6 without being pressed by the ball pressing device 8, and at the same time ensure that the ball 72 cannot continue to squeeze the piston sleeve 81 after entering.

[0036] like Figure 2As shown, the intermediate cylinder body 2 includes an intermediate cylinder body 1 21 and an intermediate cylinder body 2 22 connected together by an end cover 9; the marble pressing device 8 is located in the intermediate cylinder body 1 21, and the intermediate piston 11 is located in the intermediate cylinder body 2 22. The marble pressing device 8 includes a piston sleeve 81, which is sleeved on the sleeve 5 and the front end of the piston sleeve 81 is pressed against the end cover by a spring 83. The tail of the piston sleeve 81 is provided with an inclined surface 84. Specifically, the inclined surface 84 can be formed by gradually enlarging the inner opening of the piston sleeve 81. A sealed cavity 85 is formed between the outer tail of the piston sleeve 81 and the end cover 9, and a pressure in the sealed cavity is released. During inflation, the spring 83 is compressed, the marble pressing device 8 moves forward, and the slot 73 on the connecting rod 6 is located below the inclined surface 84. At this time, the marble 72 is not squeezed by the marble pressing device 8, and the sleeve 5 brings the marble 72 out of the slot 73; when the piston rod extends forward, the sleeve 5 drives the marble 72 to squeeze the piston sleeve 81 through the inclined surface 84, and the spring 83 is compressed, and the marble 72 falls into the slot 73. At this time, the marble 72 can no longer squeeze the piston sleeve 81, and the spring 83 is reset. The inner surface of the piston sleeve 81 presses the marble 72 in the slot 73, thereby smoothly connecting the sleeve 5 and the connecting rod 6 together.

[0037] In this embodiment, we further set the connecting rod 6 to be a hollow structure, and a through hole 131 is opened at the connection between the sleeve 5 and the front rod 4. The tail of the connecting rod 6 extends out of the rear piston 12, and the gas on the rear side of the front piston 10 in the front cylinder body 1 enters the rear cylinder body 3 through the sleeve 5 and the connecting rod 4 to push the rear piston 12 to move forward. On the one hand, it can achieve a multi-stage pressurization form, and on the other hand, it can reduce the number of air holes opened, facilitate gas path integration, and make the structure of the entire device more reasonable.

[0038] Specifically, if Figure 2-4 As shown, the sleeve 5 is connected to the front rod 4 through the front shaft 13. The front shaft 13 includes a solid small head and a hollow big head. The solid small head is provided with an external thread. The front rod 4 is fixed to the solid small head through a thread. The hollow big head is provided with an external thread. The sleeve 5 is fixed to the hollow big head through a thread. A through hole 131 is provided at the connection between the solid small head and the hollow big head. A plurality of through holes 131 can be arranged in a circular pattern. The gas enters the sleeve 5 through the through hole 131 and then enters the connecting rod 4 and finally reaches the rear end of the rear piston 12 in the rear cylinder 3. The front piston 10 is pressed tightly against the tail of the front rod 4 through the front shaft 13.

[0039] like Figure 4As shown, the two-stroke multi-stage supercharged cylinder further includes a rear shaft 14. The rear shaft 14 is a hollow structure and includes a hollow cylindrical body with an outward flange at the rear end of the cylindrical body. The connecting rod 6 is threadedly mounted on the rear shaft 14, and the rear piston 12 is mounted on the rear shaft 14, with the end of the rear shaft 14 located behind the rear piston 12. The front rod 4, the sleeve 5, and the connecting rod are installed through the front shaft 13 and the rear shaft 14, making disassembly and installation convenient.

[0040] In this embodiment, Figure 11 As shown, we can also set up multiple boosting cylinders between the middle cylinder 2 and the rear cylinder 3 as needed. Each of the boosting cylinders is provided with a piston. The connecting rod 6 passes through each boosting cylinder in sequence. The piston is fixed to the connecting rod 6. The connecting rod 6 can be provided with multiple air holes for simultaneously intake air into each boosting cylinder during forward movement. That is, each boosting cylinder and the rear cylinder 3 can be ventilated simultaneously through the hollow structure of the front cylinder 1 and the connecting rod 6. By connecting multiple pistons in series on the connecting rod, the number of pressurized pistons during operation is increased, thereby increasing the working thrust of the cylinder.

[0041] The specific working principle and process of the present invention are as follows:

[0042] When the cylinder is in the initial state: Figure 5 As shown, the piston sleeve is in an ejected state under the elastic force of the spring 83.

[0043] The cylinder extends the first stroke: Figure 6 As shown, air is taken in through ports A and B, and air is exhausted through ports C, D, E, and F. That is, air is taken in through port A by the middle cylinder 2 and air is taken in through port B by the rear cylinder 3. The space where the spring 83 is located is exhausted through port D (exhaust occurs when the spring is compressed). Air taken in through port A pushes the middle piston 11 forward, and the middle piston 11 pushes the sleeve 5 forward. The sleeve 5 pushes the front piston 10 and the front rod 4 forward through the front shaft 13. During this process, when the sleeve 5 moves forward, the marble 72 on the sleeve 5 will move with the sleeve 5. When it moves to the position of the piston sleeve 81, the marble 72 hits the piston sleeve 81 and continues to move forward to start squeezing the piston sleeve. The piston sleeve 81 is squeezed by the marble 72, and the spring 83 is compressed (at the same time, the D air outlet discharges the gas in the space where the spring 83 is located to ensure that the spring can be compressed normally). The marble 72 continues to move forward until it completely falls into the groove 73 on the connecting rod 6. The piston sleeve 81 pops out under the action of the spring 83 and presses the marble 72 in the groove 73 through its surface. At this time, the connecting rod 6, the sleeve 5 and the front rod 4 are connected and fixed together; the air intake at the B air inlet is used to provide a backward force to the rear piston 12, overcome the friction between the sleeve 5 and the marble 72, and ensure that the connecting rod 6 will not move forward with the sleeve 5, thereby accurately realizing the movement of the first stroke.

[0044] The cylinder extends to the second stroke: Figure 7 As shown, air is taken in through port G and exhausted through ports B and C, that is, the front end of the front cylinder body 1 is exhausted through port C, the front end of the rear cylinder body 3 is exhausted through port B, and the rear end of the front cylinder body 1 is taken in through port G. At the same time, the gas reaches the rear side of the rear piston 12 of the rear cylinder body 3, the front piston 10 and the rear piston 12 move forward at the same time, and the connecting rod 6, the sleeve 5 and the front rod 4 move forward at the same time to realize the movement of the second stroke. At this time, the intermediate piston 10 and the sleeve 5 are in a separated state.

[0045] The cylinder retracts to the second stroke: Figure 8 As shown, air enters through ports A and B, and exhausts through ports C, D, E, and F. That is, air enters the rear end of the intermediate cylinder 2 and the front end of the rear cylinder 3. Air entering the front end of the rear cylinder 3 pushes the rear piston 12 rearward, which in turn drives the connecting rod 6, sleeve 5, and front rod 4 backward, achieving the second stroke retraction. Air entering the rear end of the intermediate cylinder 2 presses against the intermediate piston, preventing it from being moved by sleeve 5. After the cylinder retracts to the second stroke, sleeve 5 contacts the intermediate piston 10.

[0046] The cylinder retracts to the first stroke: Figure 9 As shown, air enters through ports C, B, and H. Air enters port B, pressing the rear piston against the rear end cover, preventing it from moving. Air enters the sealed chamber 85 between the piston sleeve 81 and the end cover through port H, causing the piston sleeve 81 to compress the spring 83. The piston sleeve 81 no longer squeezes the ball 72, and air enters the front end of the front cylinder body 1 through port C. The front piston 10 moves backward, driving the sleeve 5 backward (the connecting rod 6 is fixed). The sleeve 5 drives the ball 72 out of the slot 73, and the front piston 10 continues to drive the sleeve 5 and the front rod 4 to retract until the middle piston 11 abuts against the middle end cover, completing the retraction of the first stroke.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A two-stroke multi-stage supercharged cylinder, characterized in that: The invention comprises a piston rod and a front cylinder body (1), an intermediate cylinder body (2) and a rear cylinder body (3) which are connected together in sequence through an end cover (9), wherein the piston rod comprises a front rod (4), a sleeve (5) and a connecting rod (6); a front piston (10) is arranged in the front cylinder body (1), an intermediate piston (11) is arranged in the intermediate cylinder body (2), and a rear piston (12) is arranged in the rear cylinder body (3); The front rod (4) is located in the front cylinder body (1) and passes through the front end cover of the front cylinder body (1); the sleeve (5) is located in the middle cylinder body (2) and passes through the end cover to be connected to the tail of the front rod (4); the front piston (10) is fixedly arranged on the front rod (4); the connecting rod (6) passes through the front end cover of the rear cylinder body (3) and extends into the sleeve (5); the connecting rod (6) and the sleeve (5) are connected together by a detachable connecting mechanism; the detachable connecting mechanism is in a detached state when the piston rod moves in a first stroke; the detachable connecting mechanism is in a connected state when the piston rod moves in a second stroke; the middle piston (11) is sleeved on the connecting rod (6) and can move relative to the connecting rod (6); the middle piston (11) is located at the rear end of the sleeve (5) to push the sleeve (5) forward; the rear piston (12) is fixed on the connecting rod (6); the front cylinder body (1), the middle cylinder body (3) and the sleeve (5) are fixed to the connecting rod (6); The body (2) and the rear cylinder body (3) are both provided with an air inlet and an air outlet; the detachable connecting mechanism comprises a fixing hole (71) provided on the sleeve (5), a marble (72) provided in the fixing hole (71), a clamping groove (73) provided on the connecting rod (6), and a marble pressing device (8); the sleeve (5) drives the marble (72) to move under the action of the intermediate piston (11); when the sleeve (5) completes the first stroke, the marble (72) enters The balls (72) are inserted into the card slot (73) and are compressed by the ball-pressing device (8); when the sleeve (5) returns to start the second stroke, the ball-pressing device (8) releases the balls, and the balls (72) are driven by the sleeve (5) to leave the card slot (73); a plurality of boosting cylinders are further provided between the intermediate cylinder (2) and the rear cylinder (3), and pistons are provided in the plurality of boosting cylinders. The connecting rod (6) passes through each of the boosting cylinders in sequence, and the pistons are fixed on the connecting rod (6).

2. A two-stroke multi-stage boost cylinder according to claim 1, characterized in that: The inner side of the fixing hole (71) is a cylindrical structure, and the outer side is a spherical structure. The fixing hole (71) and the marble (72) are clearance-matched, and the opening diameter of the upper end of the spherical structure is less than the diameter of the marble (72).

3. A two-stroke multi-stage boost cylinder according to claim 2, characterized in that: The height of the fixing hole is 1 / 2 of the diameter of the marble (72), and the height of the cylindrical structure is equal to the thickness of the sleeve and equal to 1 / 4 of the diameter of the marble (72).

4. A two-stroke multi-stage boost cylinder according to claim 1, characterized in that: The connecting rod (6) comprises a first body with a larger diameter at the front end and a second body with a smaller diameter at the rear end, and a slot (73) is formed between the first body and the second body.

5. The two-stroke multi-stage boost cylinder according to claim 1, characterized in that: The intermediate cylinder body (2) comprises an intermediate cylinder body 1 (21) and an intermediate cylinder body 2 (22) connected together via an end cover (9); the ball pressing device (8) is located in the intermediate cylinder body 1 (21), and the intermediate piston (11) is located in the intermediate cylinder body 2 (22); the ball pressing device (8) comprises a piston sleeve (81), the piston sleeve (81) is sleeved on the sleeve (5), and the front end of the piston sleeve (81) is pressed against the end cover via a spring (83); the tail of the piston sleeve (81) is provided with an inclined surface (84), and a sealed cavity (85) is formed between the outside of the tail of the piston sleeve (81) and the end cover (9), and when air is inflated into the sealed cavity, the spring (83) is compressed.

6. A two-stroke multi-stage boost cylinder according to claim 1, characterized in that: The connecting rod (6) is a hollow structure, and a through hole (131) is provided at the connection between the sleeve (5) and the front rod (4). The tail of the connecting rod (6) extends out of the rear piston (12), and the gas in the front cylinder (1) can enter the rear cylinder (3) through the sleeve (5) and the connecting rod (6) to push the rear piston (12) forward.

7. A two-stroke multi-stage boost cylinder according to claim 6, characterized in that: The sleeve (5) is connected to the front rod (4) through the front shaft (13); the front shaft (13) includes a solid small head and a hollow large head; the solid small head is provided with an external thread; the front rod (4) is fixed to the solid small head through a thread; the hollow large head is provided with an external thread; the sleeve (5) is fixed to the hollow large head through a thread; and the through hole (131) is provided at the connection between the solid small head and the hollow large head.

8. The two-stroke multi-stage boost cylinder according to claim 6, characterized in that: The invention also includes a rear axle (14), which is a hollow structure. The rear axle (14) includes a body of a hollow cylindrical structure. The tail of the body of the cylindrical structure is provided with an outward flange. The connecting rod (6) is installed on the rear axle (14) through a thread. The rear piston (12) is installed on the rear axle (14), and its end is located on the rear side of the rear piston (12).

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