New double-acting multi-stage cylinder

Abstract

A new double-acting multi-stage cylinder disclosed in an embodiment of the utility model includes, for example: a cylinder assembly, a first-stage rod assembly, a second-stage rod assembly and a one-way throttle valve. Through the specific connection structure among the cylinder assembly, the first-stage rod assembly, the second-stage rod assembly and the one-way throttle valve, while realizing the double action of the oil cylinder, the speed control of the second-stage rod assembly when extending is also realized through the one-way throttle function of the one-way throttle valve, thereby ensuring the consistency of the speed of the first-stage rod assembly and the second-stage rod assembly when extending, and improving the application scope of the new double-acting multi-stage cylinder.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic transmission, in particular to a novel double-acting multi-stage cylinder. Background Art

[0002] Hydraulic cylinders are important actuators in hydraulic systems. Hydraulic cylinders can convert hydraulic energy into mechanical energy and cooperate with various transmission mechanisms to complete various mechanical movements. Hydraulic cylinders have the characteristics of simple structure, large output force, stable and reliable performance, etc. However, in the use of hydraulic cylinders, we usually encounter situations where double-acting multi-stage cylinders are needed. The current double-acting multi-stage cylinders typically include at least two pistons and piston rods (the pistons and piston rods form a rod-barrel assembly). The pistons and piston rods can move in both directions under the pressure control of the oil, that is, they can extend forward or retract backward. However, since it is a multi-stage hydraulic cylinder, the effective area of ​​the rodless cavity is different when the pistons and piston rods of each stage are extended. When the flow rate and load remain unchanged, there is a large speed difference in the extension speed of the pistons and piston rods of each stage. For some application scenarios that require constant or stable speed, the current double-acting multi-stage cylinders are obviously not practical. Utility Model Content

[0003] Therefore, in order to overcome at least some of the defects and shortcomings in the prior art, a new double-acting multi-stage cylinder provided in an embodiment of the utility model ensures the consistency of the speed of the first-stage rod barrel assembly and the second-stage rod barrel assembly when extending, thereby improving the application scope of the new double-acting multi-stage cylinder.

[0004] Specifically, an embodiment of the utility model provides a new type of double-acting multi-stage cylinder, for example, including: a cylinder barrel assembly, which has a first cavity formed inside and a first opening at one end, and the first opening is connected to the first cavity; a first-stage rod barrel assembly, which is inserted into the first cavity through the first opening, and the first-stage rod barrel assembly is provided with a second cavity and an inner hole of an oil pipe, and the inner hole of the oil pipe is spaced apart from the second cavity; the first-stage rod barrel assembly also includes a second opening and a third opening, the second opening is connected to the second cavity, and the third opening is connected to the inner hole of the oil pipe; a second-stage rod barrel assembly, which is inserted into the second cavity through the second opening, and the second-stage rod barrel assembly is provided with a third cavity, and the inner hole of the oil pipe is connected to the third cavity through the third opening. cavity; wherein, the first-stage rod-barrel assembly divides the first cavity into a rodless cavity and a rod cavity, and the rod cavity is arranged adjacent to the first opening; the first-stage rod-barrel assembly is provided with a first oil hole, and the first oil hole connects the rod cavity and the inner hole of the oil pipe; the second-stage rod-barrel assembly divides the second cavity into a first oil cavity and a second oil cavity; the second-stage rod-barrel assembly is provided with a second oil hole, and the second oil hole connects the second oil cavity and the third cavity; the first-stage rod-barrel assembly is provided with a third oil hole, and the third oil hole connects the rodless cavity and the first oil cavity; the new double-acting multi-stage cylinder also includes a one-way throttle valve, and the one-way throttle valve is provided on the third oil hole to control the speed of the second-stage rod-barrel assembly.

[0005] In one embodiment of the utility model, the first-stage rod-barrel assembly includes: a first rod barrel, in which a second cavity is arranged, the second opening is arranged at one end of the first rod barrel, and the second opening is connected to the second cavity; a first piston, connected to the end of the first rod barrel away from the second opening; an inner oil pipe, which is passed through the second cavity of the first rod barrel and one end of which is connected to the first piston, and the inner hole of the oil pipe is arranged on the inner oil pipe; the third opening is arranged on the end of the inner oil pipe away from the first piston, and the third opening is connected to the inner hole of the oil pipe; wherein, the first piston divides the first cavity to form the rodless cavity and the rod cavity; the first oil hole passes through the first piston, the first rod barrel and the inner oil pipe to connect the rod cavity and the inner hole of the oil pipe; the second-stage rod-barrel assembly is sleeved on the inner oil pipe, and the inner hole of the oil pipe is connected to the third cavity through the third opening; the third oil hole is arranged on the first piston.

[0006] In one embodiment of the utility model, the first piston includes: a piston sleeve, which is sleeved on the end of the first rod barrel away from the second opening; a rod barrel end plug, which is plugged in the end of the second cavity away from the second opening; wherein, the piston sleeve divides the first cavity to form the rodless cavity and the rod cavity; one end of the inner oil pipe is connected to the rod barrel end plug; the third oil hole is arranged on the rod barrel end plug; the first oil hole passes through the piston sleeve, the first rod barrel, the rod barrel end plug and the inner oil pipe to connect the rod cavity and the inner hole of the oil pipe.

[0007] In one embodiment of the utility model, the two-stage rod-barrel assembly includes: a second rod-barrel, which is sleeved on the inner oil-through pipe, and the third cavity is arranged in the second rod-barrel; a second piston, which is connected to one end of the second rod-barrel adjacent to the first piston and is sleeved on the inner oil-through pipe; wherein, the second oil-through hole is arranged on the second rod-barrel, and the second piston separates the second cavity to form the first oil chamber and the second oil chamber.

[0008] In one embodiment of the utility model, the cylinder assembly is provided with a first oil port and a second oil port, the second oil port is located at one end of the cylinder assembly adjacent to the first opening, the first oil port is connected to the rodless chamber, and the second oil port is connected to the rod chamber.

[0009] In one embodiment of the utility model, the cylinder assembly includes a cylinder and a cylinder bottom, the cylinder bottom is connected to one end of the cylinder, the first opening is arranged on the end of the cylinder away from the cylinder bottom, the first oil port is arranged on the cylinder bottom, and the second oil port is arranged on the end of the cylinder away from the cylinder bottom.

[0010] In one embodiment of the utility model, the novel double-acting multi-stage cylinder further comprises a first guide sleeve, which is sleeved on the first-stage rod barrel assembly and connected to one end of the cylinder barrel assembly adjacent to the first opening.

[0011] In one embodiment of the utility model, the novel double-acting multi-stage cylinder further comprises a second guide sleeve, which is sleeved on the secondary rod barrel assembly and connected to one end of the primary rod barrel assembly adjacent to the second opening.

[0012] It can be seen from the above that one or more of the above technical solutions have at least the following beneficial effects:

[0013] The embodiment of the utility model realizes the double action of the oil cylinder by setting up a cylinder barrel assembly, a first-stage rod barrel assembly, a second-stage rod barrel assembly and a one-way throttle valve and the specific structure between them, and at the same time, realizes the speed control when the second-stage rod barrel assembly is extended through the one-way throttling function of the one-way throttle valve, thereby ensuring the consistency of the speed of the first-stage rod barrel assembly and the second-stage rod barrel assembly when they are extended, and improving the application scope of the new double-acting multi-stage cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The specific implementation of the present utility model will be described in detail below with reference to the accompanying drawings.

[0015] Figure 1 The present invention is a schematic cross-sectional view of a novel double-acting multi-stage cylinder provided in an embodiment of the present invention.

[0016] Figure 2 for Figure 1 A schematic cross-sectional structure diagram of a cylinder assembly is shown.

[0017] Figure 3 for Figure 1 A schematic cross-sectional structure diagram of a primary rod barrel assembly is shown.

[0018] Figure 4 for Figure 1 A schematic cross-sectional structure diagram of a secondary rod barrel assembly is shown. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solution in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0021] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0022] It should also be noted that the division of multiple embodiments in the present invention is only for the convenience of description and should not constitute a special limitation. The features in various embodiments can be combined and referenced to each other without contradiction.

[0023] like Figure 1 As shown, the embodiment of the utility model provides a novel double-acting multistage cylinder 10. The novel double-acting multistage cylinder 10 is, for example, a two-stage hydraulic cylinder with bidirectional hydraulic drive. Specifically, the novel double-acting multistage cylinder 10 includes, for example: a cylinder assembly 100, a primary rod assembly 200, a secondary rod assembly 300, and a one-way throttle valve 400.

[0024] Among them, Figure 1 and 2 As shown, the cylinder assembly 100 is, for example, a long cylindrical component, typically including a cylinder 110 and a cylinder bottom 120. The cylinder bottom 120 is connected to one end of the cylinder 110. A first cavity 103 is formed inside the cylinder assembly 100. A first opening 104 is provided at one end of the cylinder assembly 100, for example, an end away from the cylinder bottom 120, and the first opening 104 is connected to the first cavity 103.

[0025] In addition, if Figure 1 and Figure 3As shown, the primary rod barrel assembly 200 is inserted into the first cavity 103 through the first opening 104. The primary rod barrel assembly 200 is also, for example, a long cylindrical component. Specifically, the primary rod barrel assembly 200 is provided with a second cavity 208 and an inner hole 204 of an oil pipe, and the inner hole 204 of the oil pipe is spaced apart from the second cavity 208. Specifically, the inner hole 204 of the oil pipe is not connected to the second cavity 208. In addition, the primary rod barrel assembly 200 further includes a second opening 207 and a third opening 205, the second opening 207 is connected to the second cavity 208, and the third opening 205 is connected to the inner hole 204 of the oil pipe. The primary rod barrel assembly 200 separates the first cavity 103 into a rodless cavity 101 and a cavity with a rod 102, and the cavity with a rod 102 is arranged adjacent to the first opening 104.

[0026] Furthermore, if Figure 4 As shown, the secondary rod barrel assembly 300 is inserted into the second cavity 208 through the second opening 207. The secondary rod barrel assembly 300 is, for example, a long cylindrical component. The secondary rod barrel assembly 300 is provided with a third cavity 301, and the inner hole 204 of the oil pipe is connected to the third cavity 301 through the third opening 205.

[0027] The first-stage rod barrel assembly 200 is provided with a first oil hole 203, and the first oil hole 203 connects the rod cavity 102 and the oil pipe inner hole 204. The second-stage rod barrel assembly 300 separates the second cavity 208 to form a first oil cavity 201 and a second oil cavity 202; the second-stage rod barrel assembly 300 is provided with a second oil hole 302, and the second oil hole 302 connects the second oil cavity 202 and the third cavity 301. The first-stage rod barrel assembly 200 is provided with a third oil hole 206, and the third oil hole 206 connects the rodless cavity 101 and the first oil cavity 201.

[0028] Based on the above, Figure 1 As shown, the novel double-acting multistage cylinder 10 also includes a one-way throttle valve 400, for example. The one-way throttle valve 400 is arranged on the third oil hole 206 to control the speed of the secondary rod barrel assembly 300. Typically, the one-way throttle valve 400 is, for example, a combination of a one-way valve and a throttle valve in parallel, and its function is to set a certain throttle port in the one-way fluid passage so that when the fluid flows through the throttle port, the flow rate passing through the throttle port is reduced, thereby achieving the purpose of controlling the movement speed of the hydraulic cylinder. The one-way throttle valve 400 has a throttling function in one flow direction, thereby realizing the speed control of the secondary rod barrel assembly 300 when it is extended through flow control. When moving in the opposite direction, the one-way throttle valve 400 is fully opened, there is no back pressure, and the oil can pass quickly.

[0029] like Figure 1As shown, when the rodless chamber 101 is filled with oil, under the action of oil pressure, the primary rod barrel assembly 200 drives the secondary rod barrel assembly 300 to move from the left to the right end, and the oil in the rod chamber 102 flows out of the cylinder assembly 100. When the primary rod barrel assembly 200 moves to the rightmost end, the primary rod barrel assembly 200 no longer moves to the right end. At this time, under the action of oil pressure, the oil in the rodless chamber 101 enters the first oil chamber 201 through the one-way throttle valve 400 and the third oil hole 206, driving the secondary rod barrel assembly 300 to continue to move from left to right to the maximum stroke, so that the secondary rod barrel assembly 300 is fully extended. In the process of extending the primary rod barrel assembly 200 and the secondary rod barrel assembly 300, the oil in the second oil chamber 202 flows into the third cavity 301, the oil pipe inner hole 204, the first oil hole 203 and the rod chamber 102 through the second oil hole 302, and finally flows out of the cylinder assembly 100. Since the area of ​​the oil pressure force of the first-stage rod barrel assembly 200 is larger than that of the second-stage rod barrel assembly 300 (or the cross-sectional area of ​​the rodless chamber 101 is larger than the cross-sectional area of ​​the first oil chamber 201), a one-way throttle valve 400 is provided in the third oil hole 206, and during the extension process of the second-stage rod barrel assembly 300, the one-way throttle valve 400 is opened and the size of the throttle opening of the one-way throttle valve is set to play a throttling role, so that the flow through the third oil hole 206 is reduced, thereby controlling the flow entering the first oil chamber 201, thereby controlling the extension speed of the second-stage rod barrel assembly 300 to be reduced, so that the extension speed of the second-stage rod barrel assembly 300 is consistent with the extension speed of the first-stage rod barrel assembly 200.

[0030] Furthermore, if Figure 1 As shown, when oil enters the rod chamber 102, under the action of oil pressure, the primary rod barrel assembly 200 drives the secondary rod barrel assembly 300 to move and retract from the right to the left end, and at this time, the oil in the rodless chamber 101 flows out of the cylinder assembly 100. When the primary rod barrel assembly 200 moves to the leftmost end, the primary rod barrel assembly 200 and the cylinder assembly 100 remain relatively still. At this time, under the action of oil pressure, the oil in the rod chamber 102 enters the second oil chamber 202 through the first oil hole 203, the oil pipe inner hole 204, the third cavity 301, and the second oil hole 302, and continues to drive the secondary rod barrel assembly 300 to move from the right to the left until the secondary rod barrel assembly 300 is completely retracted. During the retraction of the primary rod assembly 200 and the secondary rod assembly 300, the oil in the rodless chamber 101 flows out of the cylinder assembly 100; in addition, the oil in the first oil chamber 201 enters the rodless chamber 101 through the third oil hole 206 and the one-way throttle valve 400, and finally flows out of the cylinder assembly 100. During the retraction of the secondary rod assembly 300, the one-way throttle valve 400 is fully opened, so the one-way throttle valve 400 does not play a throttling role, and there is no back pressure in the first oil chamber 201, so that the oil in the first oil chamber 201 can quickly return, thereby avoiding the difficulty of retracting the secondary rod assembly 300 of the double-acting multi-stage cylinder 10.

[0031] Therefore, the embodiment of the utility model realizes the double action of the oil cylinder by setting up the cylinder assembly 100, the first-stage rod assembly 200, the second-stage rod assembly 300 and the one-way throttle valve 400 and the specific structure between them, and at the same time, realizes the speed control of the second-stage rod assembly 300 when extending through the one-way throttling function of the one-way throttle valve 400, thereby ensuring the consistency of the speed of the first-stage rod assembly 200 and the second-stage rod assembly 300 when extending, and improving the application scope of the new double-acting multi-stage cylinder 10.

[0032] Furthermore, if Figure 1 and Figure 3 As shown, the primary rod barrel assembly 200 includes, for example, a first rod barrel 210, a first piston 220, and an inner oil pipe 230. The first rod barrel 210 is a cylindrical part with openings at both ends, and a second cavity 208 is provided inside. The second opening 207 is provided at one end of the first rod barrel 210, and the second opening 207 is connected to the second cavity 208. The first piston 220 is connected to the end of the first rod barrel 210 away from the second opening 207. The inner oil pipe 230 is, for example, a slender tubular part, and is passed through the second cavity 208 of the first rod barrel 210. One end of the inner oil pipe 230 is connected to the first piston 220, and the inner hole 204 of the oil pipe is provided on the inner oil pipe 230, for example, the inner hole 204 of the oil pipe passes through the inner oil pipe 230 along the length direction of the inner oil pipe 230. The third opening 205 is provided on the end of the inner oil pipe 230 away from the first piston 220, and the third opening 205 is connected to the inner hole 204 of the oil pipe. Further, the first piston 220 separates the first cavity 103 to form the rodless cavity 101 and the rod cavity 102. The first oil hole 203 passes through the first piston 220, the first rod barrel 210 and the inner oil pipe 230 to connect the rod cavity 102 and the inner hole 204 of the oil pipe. The secondary rod barrel assembly 300 is sleeved on the inner oil pipe 230 through the third cavity 301, and the inner hole 204 of the oil pipe is connected to the third cavity 301 through the third opening 205. The third oil hole 206 is provided on the first piston 220.

[0033] Furthermore, if Figure 3As shown, the first piston 220 includes: a piston sleeve 221 and a rod barrel end plug 222. The piston sleeve 221 is sleeved on the end of the first rod barrel 210 away from the second opening 207; the rod barrel end plug 222 is plugged in the second cavity 208 at the end away from the second opening 207. A sealing assembly is usually provided on the piston sleeve 221, so that the piston sleeve 221 separates the first cavity 103 to form the rodless cavity 101 and the rod cavity 102. One end of the inner oil pipe 230 is connected to the rod barrel end plug 222. The third oil hole 206 is provided on the rod barrel end plug 222; the first oil hole 203 passes through the piston sleeve 221, the first rod barrel 210, the rod barrel end plug 222 and the inner oil pipe 230 to connect the rod cavity 102 and the inner hole 204 of the oil pipe.

[0034] In one embodiment of the present invention, Figure 1 and Figure 4 As shown, the secondary rod barrel assembly 300 includes: a second rod barrel 310 and a second piston 320. The third cavity 301 is arranged in the second rod barrel 310. The second rod barrel 310 is sleeved on the inner oil pipe 230, that is, the inner oil pipe 230 is penetrated in the third cavity 301. The second piston 320 is connected to one end of the second rod barrel 310 adjacent to the first piston 220 and sleeved on the inner oil pipe 230. Furthermore, the second oil hole 302 is arranged on the second rod barrel 310, and the second piston 320 separates the second cavity 208 to form the first oil chamber 201 and the second oil chamber 202.

[0035] In addition, if Figure 2 As shown, the cylinder assembly 100 is provided with a first oil port 105 and a second oil port 106. The second oil port 106 is located at one end of the cylinder assembly 100 adjacent to the first opening 104. Specifically, the first oil port 105 is provided on the cylinder bottom 120, and the second oil port 106 is provided on one end of the cylinder 110 away from the cylinder bottom 120. Figure 1 As shown, the first oil port 105 is connected to the rodless chamber 101 , and the second oil port 106 is connected to the rod chamber 102 .

[0036] In other embodiments of the present invention, Figure 1As shown, the novel double-acting multistage cylinder 10 further includes, for example, a first guide sleeve 500. The first guide sleeve 500 is sleeved on the primary rod barrel assembly 200, and the first guide sleeve 500 is connected to one end of the cylinder barrel assembly 100 adjacent to the first opening 104. Typically, a sealing assembly is provided on the first guide sleeve 500 for sealing the rod chamber 102. The first guide sleeve 500 is used to guide and support the primary rod barrel assembly 200. Further, the novel double-acting multistage cylinder 10 further includes a second guide sleeve 600, and the second guide sleeve 600 is sleeved on the secondary rod barrel assembly 300 and connected to one end of the primary rod barrel assembly 200 adjacent to the second opening 207. Typically, a sealing assembly is provided on the second guide sleeve 600 for sealing the second oil chamber 202. The second guide sleeve 600 is used to guide and support the secondary rod barrel assembly 300.

[0037] To summarize, the embodiment of the utility model realizes the double action of the oil cylinder by setting up the cylinder assembly 100, the first-stage rod assembly 200, the second-stage rod assembly 300 and the one-way throttle valve 400 and the specific structure between them, and at the same time, realizes the speed control of the second-stage rod assembly 300 when extending through the one-way throttling function of the one-way throttle valve 400, thereby ensuring the consistency of the speed of the first-stage rod assembly 200 and the second-stage rod assembly 300 when extending, and improving the application scope of the new double-acting multi-stage cylinder 10.

[0038] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A new type of double-acting multi-stage cylinder, characterized in that: include: A cylinder assembly, having a first cavity formed therein and a first opening disposed at one end, wherein the first opening is connected to the first cavity; A primary rod barrel assembly is inserted into the first cavity through the first opening, the primary rod barrel assembly is provided with a second cavity and an inner hole of an oil pipe, the inner hole of the oil pipe is spaced apart from the second cavity; the primary rod barrel assembly further includes a second opening and a third opening, the second opening is connected to the second cavity, and the third opening is connected to the inner hole of the oil pipe; A secondary rod barrel assembly is inserted into the second cavity through the second opening, a third cavity is provided on the secondary rod barrel assembly, and the inner hole of the oil pipe is connected to the third cavity through the third opening; The first-stage rod barrel assembly divides the first cavity into a rodless cavity and a rod cavity, and the rod cavity is arranged adjacent to the first opening; the first-stage rod barrel assembly is provided with a first oil hole, and the first oil hole communicates with the rod cavity and the inner hole of the oil pipe; The secondary rod barrel assembly separates the second cavity to form a first oil cavity and a second oil cavity; the secondary rod barrel assembly is provided with a second oil hole, which connects the second oil cavity and the third cavity; the primary rod barrel assembly is provided with a third oil hole, which connects the rodless cavity and the first oil cavity; the new double-acting multi-stage cylinder also includes a one-way throttle valve, which is provided on the third oil hole to control the speed of the secondary rod barrel assembly.

2. The novel double-acting multi-stage cylinder as claimed in claim 1 is characterized in that: The primary rod barrel assembly comprises: A first barrel having a second cavity disposed therein, wherein the second opening is disposed at one end of the first barrel, and the second opening is connected to the second cavity; A first piston connected to an end of the first rod barrel away from the second opening; An inner oil pipe is provided in the second cavity of the first rod barrel, and one end of the inner oil pipe is connected to the first piston, and the inner hole of the oil pipe is provided on the inner oil pipe; the third opening is provided on one end of the inner oil pipe away from the first piston, and the third opening is connected to the inner hole of the oil pipe; Among them, the first piston divides the first cavity to form the rodless cavity and the rod cavity; the first oil hole passes through the first piston, the first rod barrel and the inner oil tube to connect the rod cavity and the inner hole of the oil tube; the secondary rod barrel assembly is sleeved on the inner oil tube, and the inner hole of the oil tube is connected to the third cavity through the third opening; the third oil hole is arranged on the first piston.

3. The novel double-acting multi-stage cylinder as claimed in claim 2 is characterized in that: The first piston comprises: A piston sleeve, sleeved on an end of the first rod barrel away from the second opening; A rod barrel end plug, plugged in the second cavity at one end away from the second opening; Among them, the piston sleeve divides the first cavity to form the rodless cavity and the rod cavity; one end of the inner oil pipe is connected to the rod barrel end plug; the third oil hole is arranged on the rod barrel end plug; the first oil hole passes through the piston sleeve, the first rod barrel, the rod barrel end plug and the inner oil pipe to connect the rod cavity and the inner hole of the oil pipe.

4. The novel double-acting multi-stage cylinder as claimed in claim 2 is characterized in that: The secondary rod barrel assembly comprises: A second rod barrel is sleeved on the inner oil pipe, and the third cavity is arranged in the second rod barrel; A second piston is connected to one end of the second rod barrel adjacent to the first piston and is sleeved on the inner oil pipe; The second oil hole is arranged on the second rod barrel, and the second piston separates the second cavity to form the first oil chamber and the second oil chamber.

5. The novel double-acting multi-stage cylinder as claimed in claim 1 is characterized in that: The cylinder assembly is provided with a first oil port and a second oil port, the second oil port is located at one end of the cylinder assembly adjacent to the first opening, the first oil port is connected to the rodless cavity, and the second oil port is connected to the rod cavity.

6. The novel double-acting multi-stage cylinder as claimed in claim 5 is characterized in that: The cylinder assembly includes a cylinder and a cylinder bottom, the cylinder bottom is connected to one end of the cylinder, the first opening is arranged on the end of the cylinder away from the cylinder bottom, the first oil port is arranged on the cylinder bottom, and the second oil port is arranged on the end of the cylinder away from the cylinder bottom.

7. The novel double-acting multi-stage cylinder as claimed in claim 1 is characterized in that: The novel double-acting multi-stage cylinder also includes a first guide sleeve, which is sleeved on the first-stage rod barrel assembly and connected to one end of the cylinder barrel assembly adjacent to the first opening.

8. The novel double-acting multi-stage cylinder as claimed in claim 1 is characterized in that: The novel double-acting multi-stage cylinder also includes a second guide sleeve, which is sleeved on the secondary rod barrel assembly and connected to one end of the primary rod barrel assembly adjacent to the second opening.

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