A double stroke cylinder

Abstract

The present invention discloses a double-stroke cylinder. According to an embodiment of the present invention, the double-stroke cylinder comprises a front cylinder and a pressurizing cylinder connected to each other, the front cylinder comprises a front cylinder barrel; a front cylinder piston is arranged in the front cylinder barrel, and the front cylinder piston divides the front cylinder barrel into a first air chamber and a second air chamber; a front cylinder shaft is connected to the front cylinder piston for transmission; the pressurizing cylinder comprises a pressurizing cylinder barrel; a pressurizing cylinder piston is arranged in the pressurizing cylinder barrel, and the pressurizing cylinder piston divides the pressurizing cylinder barrel into a third air chamber and a fourth air chamber; and a pressurizing cylinder shaft is connected to the pressurizing cylinder piston for transmission; the double-stroke cylinder also comprises a locking mechanism for connecting the front cylinder shaft and the pressurizing cylinder shaft, the locking mechanism comprises a first connecting part, connected to the front cylinder piston, and used for connecting the front cylinder shaft and the pressurizing cylinder shaft; and a second connecting part, matched with the first connecting part, and arranged on the pressurizing cylinder shaft, and used for connecting with the front cylinder shaft. According to an embodiment of the present invention, the double-stroke cylinder takes into account both the size and output pressure of the cylinder.

Description

Technical Field

[0001] The invention relates to the technical field of cylinders, in particular to a double-stroke cylinder. Background Art

[0002] Cylinders are widely used in various industries due to their variable length, convenient operation, and especially their ability to effectively complete linear motion. Double-stroke cylinders are increasingly widely used because they have a longer stroke and can provide greater output pressure.

[0003] With the development of automobile manufacturing industry, there are higher requirements for the volume and output pressure of welding equipment. The cylinder components in welding equipment are important power components. In order to make the cylinder output a higher pressure, solutions such as increasing the cylinder diameter and connecting more cylinders in series are often adopted. These solutions greatly increase the overall volume of the cylinder and directly affect the size and weight of the entire welding machine. In the existing technology, it is usually impossible to take into account both the installation size and output pressure of the cylinder.

[0004] Therefore, it is hoped that a new double-stroke cylinder can be provided to solve the above problems. Summary of the invention

[0005] In view of the above problems, an object of the present invention is to provide a double-stroke cylinder so as to take into account both the size and the output pressure of the cylinder.

[0006] According to one aspect of the present invention, a double-stroke cylinder is provided, comprising a front cylinder and a pressurizing cylinder connected to each other, the front cylinder comprising a front cylinder barrel; a front cylinder piston, which is arranged in the front cylinder barrel, the front cylinder piston divides the front cylinder barrel into a first air chamber and a second air chamber; and a front cylinder shaft, which is connected to the front cylinder piston for transmission; the pressurizing cylinder comprises a pressurizing cylinder barrel; a pressurizing cylinder piston, which is arranged in the pressurizing cylinder barrel, the pressurizing cylinder piston divides the pressurizing cylinder barrel into a third air chamber and a fourth air chamber; and a pressurizing cylinder shaft, which is connected to the pressurizing cylinder piston for transmission; the double-stroke cylinder also comprises a locking mechanism for connecting the front cylinder shaft and the pressurizing cylinder shaft, the locking mechanism comprises a first connecting portion, which is connected to the front cylinder piston and is used for connecting the front cylinder shaft and the pressurizing cylinder shaft; and a second connecting portion, which matches the first connecting portion and is arranged on the pressurizing cylinder shaft for connection with the front cylinder shaft.

[0007] Preferably, the double-stroke cylinder also includes a first air hole, which is connected to the first air chamber and is used for air intake and / or exhaust of the first air chamber; and a second air hole, which is connected to the second air chamber and is used for air intake and / or exhaust of the second air chamber, wherein gas enters the second air chamber through the second air hole, and drives the front cylinder piston to drive the first connecting part to move, so that the first connecting part and the second connecting part are connected; gas enters the first air chamber through the first air hole, and drives the front cylinder piston to drive the first connecting part to move, so that the first connecting part and the second connecting part are separated.

[0008] Preferably, the double-stroke cylinder also includes a third air hole, which is connected to the third air chamber and is used for air intake and / or exhaust of the third air chamber; and a fourth air hole, which is connected to the fourth air chamber and is used for air intake and / or exhaust of the fourth air chamber, wherein the gas enters the third air chamber through the third air hole to drive the pressurized cylinder piston to move, and when the front cylinder shaft and the pressurized cylinder shaft are connected, the front cylinder shaft and the pressurized cylinder shaft are driven to move; the gas enters the fourth air chamber through the fourth air hole to drive the pressurized cylinder piston to move, and when the front cylinder shaft and the pressurized cylinder shaft are connected, the front cylinder shaft and the pressurized cylinder shaft are driven to move.

[0009] Preferably, at least a portion of the pressurizing cylinder shaft is sleeved in the front cylinder shaft.

[0010] Preferably, the diameter of the front cylinder is smaller than the diameter of the pressurizing cylinder; and / or the diameter of the front cylinder piston is smaller than the diameter of the pressurizing cylinder piston.

[0011] Preferably, the double-stroke cylinder also includes a retaining ring plate connected to the front cylinder piston, and the first connecting part is arranged on the retaining ring plate, wherein the retaining ring plate is sleeved on the pressurizing cylinder shaft; the first connecting part includes a ball, and the ball is in contact with the surface of the pressurizing cylinder shaft; the second connecting part includes a groove matching the ball, and the groove is arranged on the surface of the pressurizing cylinder shaft.

[0012] Preferably, the double-stroke cylinder also includes an end core shaft, located at one end of the pressurizing cylinder shaft, for limiting positioning, the diameter of the end core shaft being larger than the diameter of the pressurizing cylinder shaft; and an intermediate shaft, connected to the retaining ring plate, for limiting positioning, wherein after the first connecting part and the second connecting part are connected, the end core shaft contacts the intermediate shaft to avoid separation of the first connecting part and the second connecting part.

[0013] Preferably, a slot is provided at one end of the front cylinder shaft; one end of the pressurizing cylinder shaft is movably arranged in the slot; a ventilation pipeline is provided on the pressurizing cylinder shaft, and the ventilation pipeline is respectively connected with the slot and the second air chamber for gas circulation.

[0014] Preferably, the double-stroke cylinder further comprises a guide member for guiding the movement of the front cylinder shaft and / or the pressurizing cylinder shaft.

[0015] Preferably, the two-stroke cylinder includes an initial position, a pre-stroke position and a working position; when the two-stroke cylinder is in the initial position, the first air chamber and the third air chamber are at the position with the largest volume, and the second air chamber and the fourth air chamber are at the position with the smallest volume; when the two-stroke cylinder is in the pre-stroke position, the third air chamber is at the position with the largest volume, and the fourth air chamber is at the position with the smallest volume, and the front cylinder shaft and the pressurized cylinder shaft are connected by the locking mechanism; when the two-stroke cylinder is in the working position, the first air chamber and the third air chamber are at the position with the smallest volume, and the second air chamber and the fourth air chamber are at the position with the largest volume.

[0016] According to the double-stroke cylinder of the embodiment of the present invention, a locking mechanism for connecting the front cylinder shaft and the pressurizing cylinder shaft is provided, which can take into account both the size and the output pressure of the double-stroke cylinder.

[0017] According to the double-stroke cylinder of the embodiment of the present invention, at least a portion of the pressurizing cylinder shaft is movably arranged in the front cylinder shaft, and a ventilation pipeline for gas circulation is provided, so that the relative movement between the front cylinder shaft and the pressurizing cylinder shaft is more reliable.

[0018] According to the double-stroke cylinder of the embodiment of the present invention, the diameter of the piston of the pressurizing cylinder is larger than the diameter of the piston of the front cylinder, and the double-stroke cylinder has a more flexible movement mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0020] Figure 1 A schematic diagram of a double-stroke cylinder according to an embodiment of the present invention is shown;

[0021] Figure 2 A structural schematic diagram of a double-stroke cylinder according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0022] Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In each of the accompanying drawings, identical elements are represented by identical or similar reference numerals. For the sake of clarity, the various parts in the accompanying drawings are not drawn to scale. In addition, some well-known parts may not be shown in the drawings.

[0023] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. Many specific details of the present invention, such as the structure, materials, dimensions, processing technology and techniques of the components are described below to provide a clearer understanding of the present invention. However, as those skilled in the art will appreciate, the present invention may be implemented without following these specific details.

[0024] It should be understood that when describing the structure of a component, when a layer or a region is referred to as being "on" or "over" another layer or another region, it may mean that it is directly on the other layer or another region, or that other layers or regions are included between it and the other layer or another region. Moreover, if the component is turned over, the layer or a region will be "below" or "beneath" another layer or another region.

[0025] Figure 1 FIG. 2 shows a schematic diagram of a dual-stroke cylinder according to an embodiment of the present invention. Figure 1 As shown, the double-stroke cylinder according to the embodiment of the present invention comprises a front cylinder 100 and a pressurizing cylinder 200 connected to each other. The front cylinder 100 comprises a front cylinder barrel 3, a front cylinder piston 8 and a front cylinder shaft 1; the pressurizing cylinder 200 comprises a pressurizing cylinder barrel 14, a pressurizing cylinder piston 12 and a pressurizing cylinder shaft 9. The double-stroke cylinder further comprises a locking mechanism 300 for connecting the front cylinder shaft 1 and the pressurizing cylinder shaft 9. The locking mechanism 300 comprises a first connecting portion 301 and a second connecting portion 302.

[0026] Specifically, the front cylinder 100 includes a front cylinder tube 3. The front cylinder tube 3 has a cylindrical shape, for example.

[0027] The front cylinder piston 8 is disposed in the front cylinder barrel 3, and the front cylinder piston 8 divides the front cylinder barrel 3 into a first air chamber and a second air chamber. Optionally, the diameter of the front cylinder piston 8 matches the inner diameter of the front cylinder barrel 3, and the front cylinder piston 8 divides the front cylinder barrel 3 into a first air chamber and a second air chamber that are not connected to each other. The first air chamber is, for example, located on the left side of the front cylinder piston 8 shown in the figure, and the second air chamber is, for example, located on the right side of the front cylinder piston 8 shown in the figure.

[0028] The front cylinder shaft 1 is connected to the front cylinder piston 8 for transmission. Figure 1 As shown, the front cylinder piston 8 moves left and right in the front cylinder barrel 3, thereby driving the front cylinder shaft 1 to move left and right. Optionally, the front cylinder shaft 1 and the front cylinder piston 8 are integrally formed.

[0029] The pressurizing cylinder 200 includes a pressurizing cylinder barrel 14. The pressurizing cylinder barrel 14 is, for example, cylindrical. Optionally, the diameter of the front cylinder 100 is smaller than the diameter of the pressurizing cylinder 200. Optionally, the diameter (inner diameter) of the front cylinder barrel 3 is smaller than the diameter (inner diameter) of the pressurizing cylinder barrel 14.

[0030] The pressurizing cylinder piston 12 is disposed in the pressurizing cylinder barrel 14, and the pressurizing cylinder piston 12 divides the pressurizing cylinder barrel 14 into a third air chamber and a fourth air chamber. Optionally, the diameter of the front cylinder piston 8 is smaller than the diameter of the pressurizing cylinder piston 12. Optionally, the diameter of the pressurizing cylinder piston 12 matches the pressurizing cylinder barrel 14, and the pressurizing cylinder piston 12 divides the pressurizing cylinder barrel 14 into a third air chamber and a fourth air chamber that are not connected to each other. The third air chamber is, for example, located on the left side of the pressurizing cylinder piston 12 shown in the figure, and the fourth air chamber is, for example, located on the right side of the pressurizing cylinder piston 12 shown in the figure.

[0031] The pressurizing cylinder shaft 9 is connected to the pressurizing cylinder piston 12 for transmission. Figure 1 As shown, the pressurizing cylinder piston 12 moves left and right in the pressurizing cylinder barrel 14, thereby driving the pressurizing cylinder shaft 9 to move left and right. Optionally, the pressurizing cylinder shaft 9 and the pressurizing cylinder piston 12 are integrally formed.

[0032] The double-stroke cylinder also includes a locking mechanism 300 for connecting the front cylinder shaft 1 and the pressurized cylinder shaft 9. The locking mechanism 300 includes a first connecting portion 301 and a second connecting portion 302. The first connecting portion 301 is connected to the front cylinder piston 8 and is used for connecting the front cylinder shaft 1 and the pressurized cylinder shaft 9. The second connecting portion 302 matches the first connecting portion 301 and is arranged on the pressurized cylinder shaft 9, and (the second connecting portion 302) is used for connecting to the front cylinder shaft 1. Optionally, the first connecting portion 301 and the front cylinder piston 8 are rigidly connected. The front cylinder piston 8 drives the first connecting portion 301 to move so that the first connecting portion 301 and the second connecting portion 302 are connected or separated.

[0033] In an optional embodiment of the present invention, the outer diameter of the front cylinder shaft 1 is larger than the outer diameter of the pressurizing cylinder shaft 9, and a deep groove is provided on the front cylinder shaft 1. At least a portion of the pressurizing cylinder shaft 9 is sleeved in the front cylinder shaft 1. The pressurizing cylinder shaft 9 can move in the front cylinder shaft 1, so that at least a portion of the stroke of the front cylinder shaft 9 and the stroke of the pressurizing cylinder shaft 9 overlap, which can reduce the size of the double-stroke cylinder. Optionally, the central axis of the front cylinder shaft 1 overlaps with the central axis of the pressurizing cylinder shaft 9.

[0034] In an optional embodiment of the present invention, the double-stroke cylinder further includes a guide member (not shown in the figure). The guide member is used to guide the movement of the front cylinder shaft 1 and / or the pressurizing cylinder shaft 9. Optionally, the guide member is arranged parallel to the front cylinder shaft 1 and / or the pressurizing cylinder shaft 9.

[0035] Figure 2 FIG. 2 shows a schematic diagram of the structure of a double-stroke cylinder according to an embodiment of the present invention. Figure 2As shown, the double-stroke cylinder according to the embodiment of the present invention comprises at least one of a front cylinder shaft 1, a front cover 2, a front cylinder barrel 3, an end core shaft 4, an intermediate shaft 5, a ball 6, a snap ring plate 7, a front cylinder piston 8, a pressurizing cylinder shaft 9, a middle partition plate 10, a pressurizing cylinder piston 12, a rear cover plate 13 and a pressurizing cylinder barrel 14. For example, the double-stroke cylinder is further provided with a first air hole 401, a second air hole 402, a third air hole 403 and a fourth air hole 404. For example, a first air chamber 501, a second air chamber 502, a third air chamber 503 and a fourth air chamber 504 are separated in the double-stroke cylinder.

[0036] Specifically, the double-stroke cylinder includes a front cylinder, a pressurizing cylinder and a locking mechanism. The front cylinder is divided into two stroke sections: a pre-stroke and a working stroke. The front cylinder includes, for example, a front cylinder shaft 1, a front cover 2, a front cylinder barrel 3, a middle partition 10, a front cylinder piston 8, an intermediate shaft 5 and corresponding seals and guides.

[0037] The pressurizing cylinder, for example, includes a middle partition plate 10, a pressurizing cylinder shaft 9, an end core shaft 4, a rear cover plate 13, and corresponding sealing components and guide components.

[0038] In an optional embodiment of the present invention, the front cover 2 is located at one end of the two-stroke cylinder and is used for sealing the two-stroke cylinder, for example, for sealing the first air chamber 501. The front cover 2 is provided with a through hole for passing the front cylinder shaft 1. The rear cover plate 13 is located at the other end of the two-stroke cylinder and is used for sealing the two-stroke cylinder, for example, for sealing the fourth air chamber 504.

[0039] In an optional embodiment of the present invention, a middle partition plate 10 is further provided in the double-stroke cylinder. The middle partition plate 10 is used to separate the front cylinder piston 8 and the pressurizing cylinder piston 12, that is, to separate the second air chamber 502 and the third air chamber 503.

[0040] In an optional embodiment of the present invention, the double-stroke cylinder further includes a snap ring plate 7. The snap ring plate 7 is connected to the front cylinder piston 8, and the first connecting portion (not shown in the figure) is arranged on the snap ring plate 7. Optionally, the snap ring plate 7 is sleeved on the pressurized cylinder shaft 9. The first connecting portion includes a ball 6, and the ball 6 contacts the surface of the pressurized cylinder shaft 9. The second connecting portion (not shown in the figure) includes a groove matching the ball 6, and the groove is arranged on the surface of the pressurized cylinder shaft 9. The double-stroke cylinder further includes an end core shaft 4 and an intermediate shaft 5. The end core shaft 4 is located at one end of the pressurized cylinder shaft 9 and is used for limiting. The diameter of the end core shaft 4 is larger than the diameter of the pressurized cylinder shaft 9. The end core shaft 4 is, for example, a circular shaft coaxial with the pressurized cylinder shaft 9. The intermediate shaft 5 is connected to the snap ring plate 7 for limiting. Optionally, the intermediate shaft 5 is a sleeve (cylinder) sleeved on the pressurized cylinder shaft 9. After the first connection part (ball 6) and the second connection part (groove) are connected, the end core shaft 4 contacts the intermediate shaft 5 to prevent the first connection part and the second connection part from being separated. In the above embodiment of the present invention, the snap ring plate 7, the ball 6, the intermediate shaft 5 and the pressurizing cylinder shaft 9 constitute a locking mechanism; the end core shaft 4 and the locking mechanism play a limiting role.

[0041] In an optional embodiment of the present invention, a slot is provided at one end of the front cylinder shaft 1. One end of the pressurizing cylinder shaft 9 is movably disposed in the slot. A vent line 15 is provided on the pressurizing cylinder shaft 9, and the vent line 15 is respectively connected to the slot and the second air chamber for gas circulation. Optionally, a communicating vent hole (vent line 15) is provided on the pressurizing cylinder shaft 9, the end core shaft 4 and the front cylinder piston 8.

[0042] In an optional embodiment of the present invention, the first air hole 401 is connected to the first air chamber 501, and is used for air intake and / or exhaust of the first air chamber 501; the second air hole 402 is connected to the second air chamber 502, and is used for air intake and / or exhaust of the second air chamber 502. The gas enters the second air chamber 502 through the second air hole 402, and drives the front cylinder piston 8 to drive the first connecting part to move, so that the first connecting part and the second connecting part are connected; the gas enters the first air chamber 501 through the first air hole 401, and drives the front cylinder piston 8 to drive the first connecting part to move, so that the first connecting part and the second connecting part are separated. Optionally, the double-stroke cylinder also includes a third air hole 403 and a fourth air hole 404. The third air hole 403 is connected to the third air chamber 503, and is used for air intake and / or exhaust of the third air chamber 503. The fourth air hole 404 is connected to the fourth air chamber 504, and is used for air intake and / or exhaust of the fourth air chamber 504. The gas enters the third air chamber 503 through the third air hole 403 to drive the pressurizing cylinder piston 12 to move, and when the front cylinder shaft 1 and the pressurizing cylinder shaft 9 are connected, the gas drives the front cylinder shaft 1 and the pressurizing cylinder shaft 9 to move; the gas enters the fourth air chamber 504 through the fourth air hole 404 to drive the pressurizing cylinder piston 12 to move, and when the front cylinder shaft 1 and the pressurizing cylinder shaft 9 are connected, the gas drives the front cylinder shaft 1 and the pressurizing cylinder shaft 9 to move.

[0043] In an optional embodiment of the present invention, the two-stroke cylinder includes an initial position, a pre-stroke position and a working position. When the two-stroke cylinder is in the initial position, the first air chamber 501 and the third air chamber 503 are at the position of maximum volume, and the second air chamber 502 and the fourth air chamber 504 are at the position of minimum volume; when the two-stroke cylinder is in the pre-stroke position, the third air chamber 503 is at the position of maximum volume, the fourth air chamber 504 is at the position of minimum volume, and the front cylinder shaft 1 and the pressurized cylinder shaft 9 are connected by a locking mechanism; when the two-stroke cylinder is in the working position, the first air chamber 501 and the third air chamber 503 are at the position of minimum volume, and the second air chamber 502 and the fourth air chamber 504 are at the position of maximum volume.

[0044] In an optional embodiment of the present invention, in combination with Figure 2 As shown, the working process of the double-stroke cylinder is as follows:

[0045] The initial position of the double-stroke cylinder is the rightmost end. When located at the initial position, the front cylinder piston 8 and the pressurizing cylinder piston 12 are both located at the rightmost end. This position is, for example, a "wide opening" state.

[0046] The two-stroke cylinder first moves from the initial position (large opening state) to the pre-stroke position (small opening state), and stays at the pre-stroke position (small opening state).

[0047] When the two-stroke cylinder performs work (for example, when welding), the two-stroke cylinder moves from the pre-stroke position to the working position (closed state) until the (front cylinder shaft 1) presses the workpiece and stops moving, and the equipment starts welding. When the work (welding) is completed, the two-stroke cylinder moves to the pre-stroke position and stays at the pre-stroke position; in this way, it makes a back-and-forth motion between the pre-stroke position and the working position, repeating the working (welding) action, and multiple repetitions of the working action constitute a working cycle.

[0048] After completing a working cycle, the two-stroke cylinder moves from the pre-stroke position to the initial position and stays at the wide opening position.

[0049] In an optional embodiment of the present invention, in combination with Figure 2 As shown, the working principle of the double-stroke cylinder is as follows:

[0050] Step 1: From the initial position to the pre-travel position (from the large opening state to the small opening state)

[0051] Under the control of the air valve, the second air hole 402 and the third air hole 403 take in air, and the first air hole 401 exhausts air. The compressed gas pushes the front cylinder piston 8 to move to the left, and at the same time pushes the retaining ring plate 7 to move. When the intermediate shaft 5 contacts the end core shaft 4, it stops moving, and the ball 6 enters the groove of the (end core shaft 4). At the same time, the retaining ring plate 7 slides to the left to the end of the front cylinder shaft 1 under the action of the compressed air introduced through the air holes (ventilation pipeline 15) on the front cylinder piston 8 and the pressurized cylinder shaft 9, and forms a lock with the ball 6, the intermediate shaft 5 and the pressurized cylinder shaft 9. The front cylinder piston 8 is connected to the pressurized cylinder piston 12 (via the locking mechanism) as a whole. Since the diameter of the pressurized cylinder piston 12 is larger than the diameter of the front cylinder piston 8, the (force-bearing) area of ​​the pressurized cylinder piston 12 is larger than the (force-bearing) area of ​​the front cylinder piston 8. Under the action of the compressed air entering from the third air hole 403, the pressurized cylinder piston 12 and the front cylinder piston 8 can withstand the external force transmitted from the front cylinder shaft 1 and remain stationary.

[0052] Step 2: From the pre-travel position to the working position (from the small opening state to the closed state)

[0053] Keep the second air hole 402 in the air intake state, the first air hole 401 in the exhaust state unchanged, the fourth air hole 404 inlet air, and the third air hole 403 exhaust air. Under the action of compressed air, the pressurized cylinder piston 12 and the front cylinder piston 8 move to the left at the same time until the front cylinder shaft 1 contacts the workpiece. The output force of the double-stroke cylinder is the sum of the pressures generated by the front cylinder piston 8 and the pressurized cylinder piston 12 under the action of compressed gas.

[0054] Step 3: From the working position to the pre-travel position (from the closed state to the small opening state)

[0055] The second air hole 402 is kept for air intake, the first air hole 401 is kept for exhaust, the third air hole 403 is kept for air intake, and the fourth air hole 404 is kept for exhaust. Since the diameter of the booster cylinder piston 12 is larger than the diameter of the front cylinder piston 8, the booster cylinder piston 12 drives all moving parts to move to the right through the locking mechanism under the action of air pressure, and the locking mechanism remains in a locked state during this process.

[0056] Step 4: From the pre-travel position to the initial position (from the small opening state to the large opening state)

[0057] The first air hole 401 is for intake, the second air hole 402 is for exhaust, and the third air hole 403 and the fourth air hole 404 remain unchanged. The compressed air pushes the snap ring plate 7 to move rightward to release the locking position, and the gas between the snap ring plate 7 and the front cylinder piston 8 is discharged through the vent holes (vent line 15) on the front cylinder piston 8 and the pressurized cylinder shaft 9, and the gas in the slot (cavity) of the front cylinder shaft 1 is discharged through the vent holes (vent line 15) on the end core shaft 4 and the pressurized cylinder shaft 9. After the locking is released, the compressed gas continues to push the snap ring plate 7 to drive the front cylinder shaft 1, the intermediate shaft 5, the ball 6 and the front cylinder piston 8 to move rightward, and the ball 6 enters the empty groove on the snap ring plate 7 until the front cylinder piston 8 and the middle partition plate 10 come into contact and stop.

[0058] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0059] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A double-stroke cylinder, comprising a front cylinder and a pressurizing cylinder connected to each other, characterized in that: The front cylinder comprises: Front cylinder; A front cylinder piston is disposed in the front cylinder barrel, and the front cylinder piston divides the front cylinder barrel into a first air chamber and a second air chamber; and A front cylinder shaft, connected to the front cylinder piston, for transmission; The pressurizing cylinder comprises: Pressurized cylinder; a pressurizing cylinder piston, disposed in the pressurizing cylinder barrel, the pressurizing cylinder piston dividing the pressurizing cylinder barrel into a third air chamber and a fourth air chamber; and A pressurizing cylinder shaft, connected to the pressurizing cylinder piston for transmission, at least a portion of the pressurizing cylinder shaft being sleeved in the front cylinder shaft; The double-stroke cylinder also includes: a locking mechanism, a snap ring plate, an end core shaft and an intermediate shaft. The locking mechanism is a locking mechanism for connecting the front cylinder shaft and the pressurizing cylinder shaft, and the locking mechanism includes: A first connection portion connected to the front cylinder piston and used for connecting the front cylinder shaft and the pressurizing cylinder shaft; and The second connection part matches the first connection part and is arranged on the pressurizing cylinder shaft for connection with the front cylinder shaft. The snap ring plate is connected to the front cylinder piston, and the first connecting portion is arranged on the snap ring plate. The end mandrel is located at one end of the pressurizing cylinder shaft and is used for limiting. The diameter of the end mandrel is larger than the diameter of the pressurizing cylinder shaft. The intermediate shaft is connected to the snap ring plate for limiting position. Wherein, the snap ring plate is sleeved on the pressurizing cylinder shaft; The first connecting portion includes a ball, and the ball contacts the surface of the pressurizing cylinder shaft; The second connecting portion includes a groove matching the ball, and the groove is arranged on the surface of the pressurizing cylinder shaft. After the first connection part and the second connection part are connected, the end core shaft contacts the intermediate shaft to prevent the first connection part and the second connection part from being separated.

2. The two-stroke cylinder according to claim 1, characterized in that: The double-stroke cylinder also includes: a first air hole, connected to the first air chamber, and used for air intake and / or exhaust of the first air chamber; and A second air hole is connected to the second air chamber and is used for air intake and / or exhaust of the second air chamber. The gas enters the second air chamber through the second air hole, and drives the front cylinder piston to drive the first connecting part to move, so that the first connecting part is connected to the second connecting part; The gas enters the first air chamber through the first air hole and drives the front cylinder piston to move the first connecting part, so that the first connecting part and the second connecting part are separated.

3. The two-stroke cylinder according to claim 1, characterized in that: The double-stroke cylinder also includes: a third air hole, connected to the third air chamber, and used for air intake and / or exhaust of the third air chamber; and a fourth air hole, connected to the fourth air chamber, for air intake and / or exhaust of the fourth air chamber, The gas enters the third air chamber through the third air hole to drive the piston of the pressurizing cylinder to move, and when the front cylinder shaft and the pressurizing cylinder shaft are connected, the front cylinder shaft and the pressurizing cylinder shaft are driven to move; The gas enters the fourth air chamber through the fourth air hole to drive the pressurizing cylinder piston to move, and when the front cylinder shaft and the pressurizing cylinder shaft are connected, the front cylinder shaft and the pressurizing cylinder shaft are driven to move.

4. The two-stroke cylinder according to claim 1, characterized in that: The diameter of the front cylinder is smaller than the diameter of the pressurizing cylinder; and / or the diameter of the front cylinder piston is smaller than the diameter of the pressurizing cylinder piston.

5. The two-stroke cylinder according to claim 1, characterized in that: One end of the front cylinder shaft is provided with a slot; one end of the pressurizing cylinder shaft is movably arranged in the slot; A ventilation pipeline is arranged on the pressurizing cylinder shaft, and the ventilation pipeline is respectively connected with the slot and the second air chamber for the circulation of gas.

6. The two-stroke cylinder according to claim 1, characterized in that: The double-stroke cylinder also includes: A guide member is used to guide the movement of the front cylinder shaft and / or the pressurizing cylinder shaft.

7. The two-stroke cylinder according to claim 1, characterized in that: The double-stroke cylinder includes an initial position, a pre-stroke position and a working position; When the double-stroke cylinder is in the initial position, the first air chamber and the third air chamber are at the positions with the largest volumes, and the second air chamber and the fourth air chamber are at the positions with the smallest volumes; When the two-stroke cylinder is in the pre-stroke position, the third air chamber is in the position with the largest volume, the fourth air chamber is in the position with the smallest volume, and the front cylinder shaft and the pressurized cylinder shaft are connected by the locking mechanism; When the double-stroke cylinder is in the working position, the first air chamber and the third air chamber are at the position with the smallest volume, and the second air chamber and the fourth air chamber are at the position with the largest volume.

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