Hydraulic cylinder and hydraulic equipment comprising same

Abstract

The utility model discloses a hydraulic cylinder and hydraulic equipment comprising the hydraulic cylinder. The front end cover is welded at one end of the cylinder barrel; the rear end cover is welded at the other end of the cylinder barrel; the piston is movably arranged in the cylinder barrel; the piston rod is arranged on the piston and extends out of the front end cover; the first buffering piece is arranged on the piston rod and located at one end of the piston; the second buffering piece is arranged on the piston rod and located at the other end of the piston. In the using process of the hydraulic cylinder, if the piston moves to the stroke end point, hard impact between the piston and the front end cover or the rear end cover is avoided through the first buffering piece and the second buffering piece. And the stability of the hydraulic cylinder is improved, and the service life of the piston is prolonged advantageously through the arrangement of the first buffer part and the second buffer part.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder and a hydraulic device containing the same. BACKGROUND

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion or oscillating motion. It is simple in structure and reliable in operation. When it is used to realize reciprocating motion, the reduction device can be omitted, and there is no transmission gap, so the motion is stable. Therefore, it is widely used in hydraulic systems of various machines.

[0003] In related technologies, during the movement of the hydraulic cylinder, when the piston moves to the end of the stroke, it will hit the cylinder cover or other components at a high speed, causing a huge impact and vibration. This not only causes damage to the cylinder itself, but also affects the stability and reliability of the entire hydraulic system. And it will affect the service life of the piston.

[0004] Therefore, it is necessary to provide a hydraulic cylinder and a hydraulic device containing the same, which has a bidirectional buffering function, and becomes an important technical problem to be solved. SUMMARY

[0005] The present application provides a hydraulic cylinder and a hydraulic device containing the same, which aims to solve the problem that in the prior art, during the movement of the hydraulic cylinder, when the piston moves to the end of the stroke, it will hit the cylinder cover or other components at a high speed, causing a huge impact and vibration. This not only causes damage to the cylinder itself, but also affects the stability and reliability of the entire hydraulic system. And it will affect the service life of the piston.

[0006] To achieve the above-mentioned purpose, the present application provides a hydraulic cylinder, comprising: a cylinder barrel; a front end cover welded to one end of the cylinder barrel; a rear end cover welded to the other end of the cylinder barrel; a piston movably arranged in the cylinder barrel; a piston rod arranged on the piston, the piston rod extending out of the front end cover; a first buffer arranged on the piston rod and located at one end of the piston; and a second buffer arranged on the piston rod and located at the other end of the piston.

[0007] In some embodiments, the first buffer and the second buffer each further comprise: a first enlarged end arranged at both ends of the first buffer; and a second enlarged end arranged at one end of the second buffer away from the piston.

[0008] In some embodiments, the first buffer and the second buffer each further comprise: a first sealing member arranged between the first buffer and the piston; and a second sealing member arranged between the second buffer and the piston.

[0009] In some embodiments, further comprising: a third seal, the first buffer is provided between the piston rod and the third seal; a fourth seal, the fourth seal is provided between the piston and the piston rod; a fifth seal, the fifth seal is provided between the cylinder and the piston.

[0010] In some embodiments, further comprising: a positioning member, the positioning member is provided between the piston and the piston rod.

[0011] In some embodiments, further comprising: a first oil port, the first oil port is provided on the front end cover; a second oil port, the second oil port is provided on the rear end cover.

[0012] In some embodiments, further comprising: a mounting seat, the mounting seat is provided on the rear end cover.

[0013] Based on another purpose of the present application, the present application also provides a hydraulic device using the hydraulic cylinder as described above.

[0014] The technical scheme of the present application provides a hydraulic cylinder, comprising: a cylinder; a front end cover, the front end cover is welded to one end of the cylinder; a rear end cover, the rear end cover is welded to the other end of the cylinder; a piston, the piston is movably provided in the cylinder; a piston rod, the piston rod is provided on the piston, and the piston rod extends out of the front end cover; a first buffer, the first buffer is provided on the piston rod and located at one end of the piston; and a second buffer, the second buffer is provided on the piston rod and located at the other end of the piston. During use of the hydraulic cylinder, if the piston moves to the end of the stroke, the first buffer and the second buffer are used to avoid hard impact of the piston with the front end cover or the rear end cover. The stability of the hydraulic cylinder is improved, and the first buffer and the second buffer are provided, which is beneficial to prolong the service life of the piston. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 It is a perspective view of a hydraulic cylinder in an embodiment of the present application;

[0017] Figure 2 It is a sectional view of a hydraulic cylinder in an embodiment of the present application;

[0018] Figure 3 It is a sectional view of a hydraulic cylinder in an embodiment of the present application; Figure 2 It is a local enlarged view of part A in the figure.

[0019] In the figure: cylinder 1, front end cover 2, first oil port 3, piston rod 4, mounting seat 5, second oil port 6, rear end cover 7, first sealing element 8, third sealing element 9, first enlarged end 10, first buffer element 11, fourth sealing element 12, piston 13, second buffer element 14, second enlarged end 15, second sealing element 17, positioning element 18, fifth sealing element 19. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0021] It should be noted that all directional indications, such as up, down, left, right, front, back, etc., in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0022] It should also be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or can have a middle element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or can have a middle element.

[0023] In addition, the description of "first", "second", etc. in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of a person of ordinary skill in the art, and when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present application.

[0024] Embodiment one

[0025] Reference Figure 1 , Figure 2 and Figure 3As shown, the application provides a hydraulic cylinder, comprising: a cylinder barrel 1; a front end cover 2 welded to one end of the cylinder barrel 1; a rear end cover 7 welded to the other end of the cylinder barrel 1; a piston 13 movably arranged in the cylinder barrel 1; a piston rod 4 arranged on the piston 13, the piston rod 4 extending out of the front end cover 2; a first buffer 11 arranged on the piston rod 4 and located at one end of the piston 13; and a second buffer 14 arranged on the piston rod 4 and located at the other end of the piston 13.

[0026] The cylinder barrel 1, the front end cover 2 and the rear end cover 7 constitute a cylinder body structure of the hydraulic cylinder, and the piston 13 and the piston rod 4 constitute an output structure of the hydraulic cylinder. The end of the piston rod 4 away from the piston 13 is connected with a load, the piston rod 4 is screwed with the piston 13, and under the control of hydraulic oil, the piston 13 and the piston rod 4 reciprocate in the cylinder body to drive the load to reach a set position. The first buffer 11 and the second buffer 14 are arranged at the two ends of the piston 13, and when the piston 13 moves to the end of the stroke, the first buffer 11 and the second buffer 14 are used to avoid hard impact of the piston 13 with the front end cover 2 or the rear end cover 7.

[0027] Specifically, during use of the hydraulic cylinder, if the piston 13 moves to the end of the stroke, the first buffer 11 and the second buffer 14 are used to avoid hard impact of the piston 13 with the front end cover 2 or the rear end cover 7. The stability of the hydraulic cylinder is improved, and the arrangement of the first buffer 11 and the second buffer 14 is beneficial to prolong the service life of the piston 13.

[0028] The front end cover 2 and the rear end cover 7 are made of ZG35 or ZG45 cast steel, and the cylinder barrel 1 is also made of cast iron material, but the inner surface of the cylinder barrel 1 is provided with a wear-resistant material coating. The piston 13 is made of aluminum alloy material, and the first buffer 11 and the second buffer 14 are both made of silica gel material. The silica gel material has good buffering performance, and has good heat resistance and corrosion resistance. The first buffer 11 and the second buffer 14 are compounded on the piston 13 by hot pressing bonding.

[0029] In the embodiment, the sixth seal is arranged between the cylinder barrel 1 and the front end cover 2 and the rear end cover 7, and the guide, the seventh seal and the dustproof piece are arranged between the piston rod 4 and the front end cover 2.

[0030] Referring to Figure 1 , Figure 2 and Figure 3As shown in some embodiments, further comprising: a first enlarged end 10, the first enlarged end 10 is arranged at both ends of the first buffer 11; the two first enlarged ends 10 of the first buffer 11 are in contact with the piston 13 and the front end cover 2 respectively, by arranging the first enlarged end 10, the contact area can be effectively increased, so as to reduce the pressure intensity of the contact surface, and reduce the possibility of damage of both ends of the first buffer 11 under the action of pressure. A second enlarged end 15 is arranged at the end of the second buffer 14 away from the piston 13. The second enlarged end 15 effectively increases the contact area between the second buffer 14 and the rear end cover 7, and reduces the possibility of damage of the end of the second buffer 14 under the action of pressure.

[0031] As shown in Figure 1 , Figure 2 and Figure 3 , in some embodiments, further comprising: a first seal 8, the first seal 8 is arranged between the first buffer 11 and the piston 13; the first seal 8 can effectively prevent hydraulic oil from entering the gap between the first buffer 11 and the piston 13, so as to prevent hydraulic oil from entering the gap between the piston 13 and the piston rod 4. A second seal 17 is arranged between the second buffer 14 and the piston 13. The second seal 17 can effectively prevent hydraulic oil from entering the gap between the second buffer 14 and the piston 13, so as to prevent hydraulic oil from entering the gap between the piston 13 and the piston rod 4.

[0032] Through the structural design of the first buffer 11, the second buffer 14, the first seal 8 and the second seal 17, it can effectively prevent hydraulic oil from entering the gap between the piston 13 and the piston rod 4, and improve the performance of the hydraulic cylinder.

[0033] As shown in Figure 1 , Figure 2 and Figure 3 , in some embodiments, further comprising: a third seal 9, the third seal 9 is arranged between the first buffer 11 and the piston rod 4; the third seal 9 can effectively prevent hydraulic oil from entering the gap between the first buffer 11 and the piston 13, so as to prevent hydraulic oil from entering the gap between the piston 13 and the piston rod 4. A fourth seal 12 is arranged between the piston 13 and the piston rod 4; the fourth seal 12 can effectively prevent hydraulic oil from passing through the gap between the piston 13 and the piston rod 4. A fifth seal 19 is arranged between the cylinder barrel 1 and the piston 13. The fifth seal 19 can effectively prevent hydraulic oil from passing through the gap between the cylinder barrel 1 and the piston 13.

[0034] As shown in Figure 1 , Figure 2 and Figure 3As shown in some embodiments, further comprising: a positioning member 18, the positioning member 18 is arranged between the piston 13 and the piston rod 4. The positioning member 18 is used to fix the relative position of the piston 13 and the piston rod 4.

[0035] Referring to Figure 1 As shown in some embodiments, further comprising: a first oil port 3, the first oil port 3 is arranged on the front end cover 2; a second oil port 6, the second oil port 6 is arranged on the rear end cover 7. The first oil port 3 and the second oil port 6 are both communicated with the cavity inside the cylinder barrel 1, and the first oil port 3 and the second oil port 6 are connected with a hydraulic station, and the action of the hydraulic cylinder is controlled through the hydraulic station.

[0036] Referring to Figure 1 As shown in some embodiments, further comprising: a mounting seat 5, the mounting seat 5 is arranged on the rear end cover 7. The mounting seat 5 is used to stably mount the mounting seat 5, and improve the stability of the mounting seat 5.

[0037] Embodiment two

[0038] In this embodiment, the same parts as in embodiment one are given the same reference numerals, and the same textual description is omitted.

[0039] This embodiment discloses a hydraulic equipment, and the hydraulic equipment uses the hydraulic cylinder in embodiment one.

[0040] The above is only part or preferred embodiments of the present application, neither the text nor the drawings can limit the scope of protection of the present application, any equivalent structural transformation using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the scope of protection of the present application.

Claims

1. A hydraulic cylinder characterized by, Comprising: a cylinder (1); a front end cover (2) welded to one end of the cylinder (1); a rear end cover (7) welded to the other end of the cylinder (1); a piston (13) movably arranged in the cylinder (1); a piston rod (4) arranged in the piston (13), the piston rod (4) extending out of the front end cover (2); a first buffer (11) arranged in the piston rod (4) at one end of the piston (13); a second buffer (14) arranged in the piston rod (4) at the other end of the piston (13).

2. A hydraulic cylinder according to claim 1, characterized in that Further comprising: a first enlarged end (10) arranged at both ends of the first buffer (11); a second enlarged end (15) arranged at one end of the second buffer (14) away from the piston (13).

3. A hydraulic cylinder as claimed in claim 1, characterized in that Further comprising: a first seal (8) arranged between the first buffer (11) and the piston (13); a second seal (17) arranged between the second buffer (14) and the piston (13).

4. The hydraulic cylinder of claim 1, wherein Further comprising: a third seal (9) arranged between the first buffer (11) and the piston rod (4); a fourth seal (12) arranged between the piston (13) and the piston rod (4); a fifth seal (19) arranged between the cylinder (1) and the piston (13).

5. The hydraulic cylinder of claim 1, wherein Further comprising: a positioning member (18) arranged between the piston (13) and the piston rod (4).

6. A hydraulic cylinder as claimed in claim 1, characterized in that Further comprising: a first oil port (3) arranged in the front end cover (2); a second oil port (6) arranged in the rear end cover (7).

7. A hydraulic cylinder according to claim 5, wherein Further comprising: a mounting seat (5) arranged in the rear end cover (7).

8. A hydraulic device, characterized by, The hydraulic device uses the hydraulic cylinder of any one of claims 1-7.

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