Hydraulic oil cylinder device and hydraulic driving system

Abstract

The utility model provides a hydraulic oil cylinder device and a hydraulic driving system. The hydraulic oil cylinder device comprises a device body, a first piston assembly and a second piston assembly. The device main body comprises a first end cover piece, a first cylinder barrel, a middle end cover piece, a second cylinder barrel and a second end cover piece, the first end cover piece is provided with a first oil port and a first oil cavity which are communicated with each other, and the first end cover piece is provided with a convex ring part; the first cylinder barrel is provided with a first piston cavity communicated with the first oil cavity, and the convex ring part is located in the first piston cavity and connected with the first cylinder barrel; the first piston assembly is arranged in the first piston cavity and the first sliding through groove in a penetrating mode and connected with the first cylinder barrel and the middle end cover piece in a sliding mode. The first piston assembly is used for abutting against the convex ring part when sliding to one end of the first piston cavity; the second piston assembly is in sliding connection with the second cylinder barrel and the second end cover piece, and the second piston assembly further abuts against the first piston assembly. The hydraulic oil cylinder device is high in working efficiency.

Description

Technical Field

[0001] This disclosure relates to the technical field of hydraulic drive systems, and in particular to a hydraulic cylinder device and a hydraulic drive system. Background Technology

[0002] A hydraulic drive system is a power system that uses pressurized fluid to convert mechanical energy into hydraulic energy, thereby driving mechanical equipment to complete its tasks. Hydraulic drive systems are widely used in industrial robots, metallurgical equipment, mechanical engineering, aerospace, automotive industry, and shipbuilding. A hydraulic drive system consists of a hydraulic pump and hydraulic cylinders, with the hydraulic cylinders connected to the hydraulic pump.

[0003] The hydraulic cylinder device of the related technology includes a cylinder body, a piston assembly and a guide assembly. The cylinder body has a first oil port, an oil cavity, a mounting groove and a second oil port, which are sequentially connected. Part of the piston assembly is located in the oil cavity and is slidably connected to the cylinder body. The piston assembly has a guide groove, which is connected to the mounting groove. One end of the guide assembly is located in the mounting groove and is connected to the cylinder body. The part of the guide assembly protruding from the mounting groove is located in the guide groove and is slidably connected to the piston assembly, such as Chinese Patent No. CN109681488A.

[0004] However, since the second port is used to introduce or export hydraulic oil, allowing the hydraulic oil to enter or exit the oil chamber along the second port and the mounting groove, the hydraulic oil pushes the piston assembly relative to the guide assembly, so that the piston assembly can drive the mechanical equipment to move. During the process of the hydraulic oil entering or exiting the oil chamber, the hydraulic oil needs to pass through the mounting groove. One end of the guide assembly is located in the mounting groove and connected to the cylinder body, so that the mounting groove is isolated, making the effective area of ​​the mounting groove for introducing or exporting hydraulic oil smaller. This results in a smaller flow rate of hydraulic oil entering or exiting the oil chamber, a lower movement speed of the piston assembly, and consequently, a lower working efficiency of the hydraulic cylinder device. Utility Model Content

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a hydraulic cylinder device and hydraulic drive system with higher working efficiency.

[0006] The purpose of this disclosure is achieved through the following technical solution:

[0007] A hydraulic cylinder device, comprising:

[0008] The main body of the device includes a first end cap, a first cylinder, an intermediate end cap, a second cylinder, and a second end cap, which are sequentially connected. The first end cap has a first oil port and a first oil cavity that are connected to each other, and the first end cap is provided with a protruding ring portion. The first cylinder has a first piston cavity that is connected to the first oil cavity, and the protruding ring portion is located in the first piston cavity and connected to the first cylinder. The intermediate end cap has a second oil port and a first sliding groove, both of which are connected to the first piston cavity. The second cylinder has a second piston cavity that is connected to the second oil port and the first sliding groove. The second end cap has a third oil port and a second sliding groove, both of which are connected to the second piston cavity.

[0009] The first piston assembly is respectively disposed in the first piston cavity and the first sliding groove, and the first piston assembly is slidably connected to the first cylinder and the intermediate end cap; the first piston assembly is used to abut against the convex ring when it slides to one end of the first piston cavity.

[0010] The second piston assembly is respectively disposed in the second piston chamber and the second sliding groove. The second piston assembly is slidably connected to the second cylinder and the second end cap respectively. The second piston assembly also abuts against the first piston assembly.

[0011] In one embodiment, the intermediate end cap is provided with a first protrusion and a second protrusion opposite to each other. The first protrusion is located in the first piston chamber and connected to the first cylinder. The first piston assembly is used to abut against the first protrusion when it slides to the other end of the first piston chamber. The second protrusion is located in the second piston chamber and connected to the second cylinder. The second piston assembly is used to abut against the second protrusion when it slides to one end of the second piston chamber.

[0012] In one embodiment, the second end cap is provided with a flange portion located inside the second piston chamber and connected to the second cylinder, and the second piston assembly is used to abut against the flange portion when sliding to the other end of the second piston chamber.

[0013] In one embodiment, a first sealing ring is provided at the connection between the convex ring portion and the first cylinder barrel.

[0014] In one embodiment, a first intermediate sealing ring is provided at the connection between the first protrusion and the first cylinder; a second intermediate sealing ring is provided at the connection between the second protrusion and the second cylinder.

[0015] In one embodiment, a second sealing ring is provided at the connection between the flange and the second cylinder.

[0016] In one embodiment, the first piston assembly includes a first piston portion and a first piston rod connected to each other. The first piston portion passes through the first piston cavity and is slidably connected to the first cylinder. When the first piston portion slides to one end of the first piston cavity, it abuts against the convex ring portion. When the first piston portion slides to the other end of the first piston cavity, it abuts against the first protrusion portion. The first piston rod passes through the first sliding groove and is slidably connected to the intermediate end cap. The first piston rod abuts against the second piston assembly.

[0017] In one embodiment, the second piston assembly includes a second piston portion and a second piston rod connected to each other. The second piston portion passes through the second piston cavity and is slidably connected to the second cylinder. When the second piston portion slides to one end of the second piston cavity, it abuts against the second protrusion. When the second piston portion slides to the other end of the second piston cavity, it abuts against the flange. The second piston rod passes through the second sliding groove and is slidably connected to the second end cap. The first piston rod abuts against the second piston rod.

[0018] In one embodiment, a third sealing ring is provided at the connection between the second piston rod and the second end cap.

[0019] A hydraulic drive system includes the hydraulic cylinder device described in any of the above embodiments.

[0020] Compared with the prior art, this disclosure has at least the following advantages:

[0021] Since the first end cap has a connected first oil port and a first oil chamber, the first oil port is used to introduce or export hydraulic oil, and the first oil chamber is connected to the first piston chamber, so that the hydraulic oil enters or flows out of the first piston chamber along the first oil port and the first oil chamber, so that the hydraulic oil pushes the first piston assembly to move relative to the first cylinder, and the second piston assembly abuts against the first piston assembly, so that the first piston assembly drives the second piston assembly to move relative to the second cylinder, so that the second piston assembly is used to drive the mechanical equipment to move.

[0022] During the process of hydraulic oil entering or exiting the first piston chamber, the hydraulic oil needs to pass through the first oil chamber. The first end cap is provided with a convex ring portion, which surrounds and covers the first oil chamber. When the first piston assembly slides to one end of the first piston chamber, it abuts against the convex ring portion, so that the convex ring portion blocks the first piston assembly outside the first oil chamber, so that the first oil chamber is not isolated. This solves the problem of the mounting groove being isolated in the prior art, so that the effective area of ​​the first oil chamber for introducing or exporting hydraulic oil is larger, thereby increasing the flow rate of hydraulic oil entering or exiting the first piston chamber, and increasing the movement speed of the first piston assembly to achieve rapid movement of the first piston assembly, thereby increasing the working efficiency of the hydraulic cylinder device. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a hydraulic cylinder device according to one embodiment;

[0025] Figure 2 for Figure 1 Enlarged schematic diagram of point A of the hydraulic cylinder device shown;

[0026] Figure 3 for Figure 1 Enlarged schematic diagram of point B of the hydraulic cylinder device shown;

[0027] Figure 4 for Figure 1 A schematic diagram of another state of the hydraulic cylinder device shown. Detailed Implementation

[0028] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] like Figures 1 to 4 As shown, a hydraulic cylinder device 10 of one embodiment includes a device body 100, a first piston assembly 200, and a second piston assembly 300; the device body 100 includes a first end cap 110, a first cylinder 120, an intermediate end cap 130, a second cylinder 140, and a second end cap 150, which are sequentially connected; the first end cap 110, the first cylinder 120, the intermediate end cap 130, the second cylinder 140, and the second end cap 150 are first end cap 110. The cylinder 120 has a first oil port 111 and a first oil chamber 112 that are connected to each other. The first end cap 110 is provided with a protruding ring portion 113. The first cylinder 120 has a first piston chamber 121 that communicates with the first oil chamber 112. The protruding ring portion 113 is located in the first piston chamber 121 and is connected to the first cylinder 120. The intermediate end cap 130 has a second oil port 131 and a first sliding groove 132. Both the second oil port 131 and the first sliding groove 132 are connected to the first piston chamber. 121 is connected; the second cylinder 140 has a second piston chamber 141, which is connected to the second oil port 131 and the first sliding groove 132 respectively; the second end cap 150 has a third oil port 151 and a second sliding groove 152, which are both connected to the second piston chamber 141; the first piston assembly 200 is respectively inserted into the first piston chamber 121 and the first sliding groove 132, and is slidably connected to the first cylinder 120 and the intermediate end cap 130 respectively; the first piston assembly 200 is used to abut against the convex ring 113 when sliding to one end of the first piston chamber 121; the second piston assembly 300 is respectively inserted into the second piston chamber 141 and the second sliding groove 152, and is slidably connected to the second cylinder 140 and the second end cap 150 respectively, and is also abutting against the first piston assembly 200.

[0032] In this embodiment, the first oil port 111 is used to introduce or export hydraulic oil, and the first oil chamber 112 is connected to the first piston chamber 121, so that hydraulic oil enters or flows out of the first piston chamber 121 along the first oil port 111 and the first oil chamber 112, thereby driving the first piston assembly 200 to move relative to the first cylinder 120. The second piston assembly 300 abuts against the first piston assembly 200, so that the first piston assembly 200 drives the second piston assembly 300 to move relative to the second cylinder 140.

[0033] The aforementioned hydraulic cylinder device 10 has a first oil port 111 and a first oil chamber 112 connected to each other on the first end cap 110. The first oil port 111 is used to introduce or export hydraulic oil, and the first oil chamber 112 is connected to the first piston chamber 121, so that hydraulic oil enters or flows out of the first piston chamber 121 along the first oil port 111 and the first oil chamber 112, so that the hydraulic oil pushes the first piston assembly 200 to move relative to the first cylinder 120, and the second piston assembly 300 abuts against the first piston assembly 200, so that the first piston assembly 200 drives the second piston assembly 300 to move relative to the second cylinder 140, so that the second piston assembly 300 is used to drive the mechanical equipment to move.

[0034] During the process of hydraulic oil entering or exiting the first piston chamber 121, the hydraulic oil needs to pass through the first oil chamber 112. The first end cap 110 is provided with a convex ring portion 113, which surrounds and covers the first oil chamber 112. When the first piston assembly 200 slides to one end of the first piston chamber 121, it abuts against the convex ring portion 113, so that the convex ring portion 113 blocks the first piston assembly 200 from the outside of the first oil chamber 112, so that the first oil chamber 112 is not blocked, thereby solving the problem of the mounting groove being blocked in the prior art. This makes the effective area of ​​the first oil chamber 112 for introducing or exporting hydraulic oil larger, thereby making the flow rate of hydraulic oil entering or exiting the first piston chamber 121 larger, and making the movement speed of the first piston assembly 200 higher, so as to realize the rapid movement of the first piston assembly 200, and thus making the working efficiency of the hydraulic cylinder device 10 higher.

[0035] like Figures 1 to 4 As shown, in one embodiment, the intermediate end cap 130 is provided with a first protrusion 133 and a second protrusion 134 opposite to each other. The first protrusion 133 is located in the first piston chamber 121 and connected to the first cylinder 120. The first piston assembly 200 is used to slide to the other end of the first piston chamber 121 and abut against the first protrusion 133. The second protrusion 134 is located in the second piston chamber 141 and connected to the second cylinder 140. The second piston assembly 300 is used to slide to one end of the second piston chamber 141 and abut against the second protrusion 134.

[0036] like Figure 1 and Figure 4 As shown, in one embodiment, the second end cap 150 is provided with a flange 153, which is located in the second piston chamber 141 and connected to the second cylinder 140. The second piston assembly 300 is used to abut against the flange 153 when sliding to the other end of the second piston chamber 141.

[0037] like Figures 1 to 2 As shown, in one embodiment, a first sealing ring 122 is provided at the connection between the convex ring portion 113 and the first cylinder barrel 120, so that the sealing performance between the convex ring portion 113 and the first cylinder barrel 120 is better.

[0038] like Figures 1 to 3 As shown, in one embodiment, a first intermediate sealing ring 123 is provided at the connection between the first protrusion 133 and the first cylinder 120, so that the sealing performance between the first protrusion 133 and the first cylinder 120 is good; a second intermediate sealing ring 142 is provided at the connection between the second protrusion 134 and the second cylinder 140, so that the sealing performance between the second protrusion 134 and the second cylinder 140 is good.

[0039] like Figure 1 and Figure 3 As shown, in one embodiment, a second sealing ring 143 is provided at the connection between the flange portion 153 and the second cylinder barrel 140, so that the sealing performance between the flange portion 153 and the second cylinder barrel 140 is better.

[0040] like Figure 1 , Figure 2 and Figure 4 As shown, in one embodiment, the first piston assembly 200 includes a first piston portion 210 and a first piston rod 220 connected to each other. The first piston portion 210 passes through the first piston cavity 121 and is slidably connected to the first cylinder 120. When the first piston portion 210 slides to one end of the first piston cavity 121, it abuts against the protruding ring portion 113. When the first piston portion 210 slides to the other end of the first piston cavity 121, it abuts against the first protrusion portion 133. The first piston rod 220 passes through the first sliding groove 132 and is slidably connected to the intermediate end cap 130. The first piston rod 220 abuts against the second piston assembly 300.

[0041] like Figure 1 , Figure 3 and Figure 4As shown, in one embodiment, the second piston assembly 300 includes a second piston portion 310 and a second piston rod 320 connected to each other. The second piston portion 310 passes through the second piston cavity 141 and is slidably connected to the second cylinder 140. When the second piston portion 310 slides to one end of the second piston cavity 141, it abuts against the second protrusion 134. When the second piston portion 310 slides to the other end of the second piston cavity 141, it abuts against the flange portion 153. The second piston rod 320 passes through the second sliding groove 152 and is slidably connected to the second end cap 150. The first piston rod 220 abuts against the second piston rod 320.

[0042] like Figure 1 and Figure 4 As shown, in one embodiment, a third sealing ring 154 is provided at the connection between the second piston rod 320 and the second end cap 150, so that the sealing performance between the second piston rod 320 and the second end cap 150 is better.

[0043] This disclosure also provides a hydraulic drive system, including the hydraulic cylinder device 10 of any of the above embodiments.

[0044] Compared with the prior art, this disclosure has at least the following advantages:

[0045] Since the first end cap 110 has a first oil port 111 and a first oil chamber 112 that are connected, the first oil port 111 is used to introduce or export hydraulic oil, and the first oil chamber 112 is connected to the first piston chamber 121, so that the hydraulic oil enters or flows out of the first piston chamber 121 along the first oil port 111 and the first oil chamber 112, so that the hydraulic oil pushes the first piston assembly 200 to move relative to the first cylinder 120, and the second piston assembly 300 abuts against the first piston assembly 200, so that the first piston assembly 200 drives the second piston assembly 300 to move relative to the second cylinder 140, so that the second piston assembly 300 is used to drive the mechanical equipment to move;

[0046] During the process of hydraulic oil entering or exiting the first piston chamber 121, the hydraulic oil needs to pass through the first oil chamber 112. The first end cap 110 is provided with a convex ring portion 113, which surrounds and covers the first oil chamber 112. When the first piston assembly 200 slides to one end of the first piston chamber 121, it abuts against the convex ring portion 113, so that the convex ring portion 113 blocks the first piston assembly 200 from the outside of the first oil chamber 112, so that the first oil chamber 112 is not blocked, thereby solving the problem of the mounting groove being blocked in the prior art. This makes the effective area of ​​the first oil chamber 112 for introducing or exporting hydraulic oil larger, thereby making the flow rate of hydraulic oil entering or exiting the first piston chamber 121 larger, and making the movement speed of the first piston assembly 200 higher, so as to realize the rapid movement of the first piston assembly 200, and thus making the working efficiency of the hydraulic cylinder device 10 higher.

[0047] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A hydraulic cylinder device, characterized in that, include: The main body of the device includes a first end cap, a first cylinder, an intermediate end cap, a second cylinder, and a second end cap, which are sequentially connected. The first end cap has a first oil port and a first oil cavity that are connected to each other, and the first end cap is provided with a protruding ring portion. The first cylinder has a first piston cavity that is connected to the first oil cavity, and the protruding ring portion is located in the first piston cavity and connected to the first cylinder. The intermediate end cap has a second oil port and a first sliding groove, both of which are connected to the first piston cavity. The second cylinder has a second piston cavity that is connected to the second oil port and the first sliding groove. The second end cap has a third oil port and a second sliding groove, both of which are connected to the second piston cavity. The first piston assembly is respectively disposed in the first piston cavity and the first sliding groove, and the first piston assembly is slidably connected to the first cylinder and the intermediate end cap; the first piston assembly is used to abut against the convex ring when it slides to one end of the first piston cavity. The second piston assembly is respectively disposed in the second piston chamber and the second sliding groove. The second piston assembly is slidably connected to the second cylinder and the second end cap respectively. The second piston assembly also abuts against the first piston assembly.

2. The hydraulic cylinder device according to claim 1, characterized in that, The intermediate end cap is provided with a first protrusion and a second protrusion. The first protrusion is located in the first piston chamber and connected to the first cylinder. The first piston assembly is used to abut against the first protrusion when it slides to the other end of the first piston chamber. The second protrusion is located in the second piston chamber and connected to the second cylinder. The second piston assembly is used to abut against the second protrusion when it slides to one end of the second piston chamber.

3. The hydraulic cylinder device according to claim 2, characterized in that, The second end cap is provided with a flange portion, which is located inside the second piston chamber and connected to the second cylinder. The second piston assembly is used to abut against the flange portion when sliding to the other end of the second piston chamber.

4. The hydraulic cylinder device according to claim 1, characterized in that, A first sealing ring is provided at the connection between the convex ring and the first cylinder.

5. The hydraulic cylinder device according to claim 2, characterized in that, A first intermediate sealing ring is provided at the connection between the first protrusion and the first cylinder; a second intermediate sealing ring is provided at the connection between the second protrusion and the second cylinder.

6. The hydraulic cylinder device according to claim 3, characterized in that, A second sealing ring is provided at the connection between the flange and the second cylinder.

7. The hydraulic cylinder device according to claim 3, characterized in that, The first piston assembly includes a first piston portion and a first piston rod connected to each other. The first piston portion passes through the first piston cavity and is slidably connected to the first cylinder. When the first piston portion slides to one end of the first piston cavity, it abuts against the convex ring portion. When the first piston portion slides to the other end of the first piston cavity, it abuts against the first protrusion portion. The first piston rod passes through the first sliding groove and is slidably connected to the intermediate end cap. The first piston rod abuts against the second piston assembly.

8. The hydraulic cylinder device according to claim 7, characterized in that, The second piston assembly includes a second piston portion and a second piston rod connected to each other. The second piston portion passes through the second piston cavity and is slidably connected to the second cylinder. When the second piston portion slides to one end of the second piston cavity, it abuts against the second protrusion. When the second piston portion slides to the other end of the second piston cavity, it abuts against the flange. The second piston rod passes through the second sliding groove and is slidably connected to the second end cap. The first piston rod abuts against the second piston rod.

9. The hydraulic cylinder device according to claim 8, characterized in that, A third sealing ring is provided at the connection between the second piston rod and the second end cap.

10. A hydraulic drive system, characterized in that, The hydraulic cylinder device includes any one of claims 1 to 9.

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