Multi-stage hydraulic oil cylinder capable of preventing sealing element from passing through hole
By employing a sandwich structure and inner and outer cylinder sealing design in multi-stage hydraulic cylinders, the problem of seal scratching is solved, improving the service life and production efficiency of hydraulic cylinders, and making them suitable for high-temperature environments.
Patent Information
- Application Number
- CN202422723886.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-11-08
AI Technical Summary
In existing multi-stage hydraulic cylinders, the seals are scratched when passing through the oil passages during reciprocating motion, affecting service life and production efficiency.
The multi-stage hydraulic cylinder with a sandwich structure avoids the seals from passing directly through the oil port through the sandwich design of the inner and outer cylinders. It uses a sealing device between the inner and outer cylinders to prevent oil leakage, and achieves the maximum stroke through the piston rod and buffer sleeve of the second-stage cylinder with limit sliding.
It effectively prevents scratches on seals, extends the service life of hydraulic cylinders, reduces production costs, is suitable for high-temperature environments, and improves the interchangeability of seals.
Smart Images
Figure CN223608982U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model mainly relates to the technical field of oil cylinder, concretely relates to a multistage hydraulic cylinder capable of avoiding the through hole of sealing element. BACKGROUND
[0002] The hydraulic cylinder is widely used in industries such as forging, metallurgy and engineering machinery, and the traditional oil cylinder is generally a single-stage hydraulic cylinder, in some application occasions requiring the use of double stroke, the short stroke hydraulic cylinder is generally used to be stacked or a multistage hydraulic cylinder is used due to the limitation of equipment installation space. Figure 1 As shown in the prior art, during reciprocating motion, in addition to the maximum first-stage oil cylinder, the piston seal of the second-stage hydraulic cylinder always passes through the oil channel on the piston rod of the first-stage cylinder, and the sealing element reciprocates through the oil channel for many times, so that the lip is easily scratched, the service life of the sealing element is affected, and the production efficiency is reduced. UTILITY MODEL CONTENTS
[0003] 1. Technical problem to be solved by the utility model:
[0004] The utility model provides a multistage hydraulic cylinder capable of avoiding the through hole of sealing element to solve the technical problems in the background.
[0005] 2. Technical scheme:
[0006] In order to achieve the above purpose, the technical scheme of the utility model is as follows:
[0007] A multistage hydraulic cylinder capable of avoiding the through hole of sealing element, comprising a cylinder body, wherein the cylinder body comprises a first-stage cylinder barrel and a second-stage cylinder barrel arranged in the first-stage cylinder barrel, one end of the second-stage cylinder barrel is fixed with a first-stage cylinder piston, the other end is fixed with a second-stage cylinder guide sleeve, the second-stage cylinder barrel divides the inside of the cylinder body into a first-stage cylinder rod cavity and a second-stage cylinder rod cavity, the second-stage cylinder barrel comprises an inner barrel and an outer barrel, and a layer is formed between the inner barrel and the outer barrel;
[0008] The outer barrel of the second-stage cylinder barrel is provided with an oil channel one close to the cylinder bottom end, the oil channel one is communicated with the second-stage cylinder rod cavity, the inner barrel of the second-stage cylinder barrel is provided with an oil channel two close to the guide sleeve end, and the oil channel two is communicated with the first-stage cylinder rod cavity;
[0009] A rod cavity oil port is arranged on the first-stage cylinder head, and the rod cavity oil port is communicated with the first-stage cylinder rod cavity and the second-stage cylinder rod cavity;
[0010] A rodless cavity oil port is arranged on the cylinder bottom, and the rodless cavity oil port is communicated with a rodless cavity;
[0011] When the rodless cavity oil port or the rod cavity oil port is filled with oil, the reciprocating operation of the second-stage cylinder barrel is driven, and the piston sealing element is prevented from passing through the oil channel.
[0012] Further improvement lies in that the outer cylinder and the inner cylinder are sealed to prevent oil leakage.
[0013] Further improvement lies in that the annular area of the rod cavity of the secondary cylinder is larger than that of the primary cylinder.
[0014] Further improvement lies in that the secondary cylinder piston rod is arranged in the cylinder body and is limited to slide, and the secondary cylinder buffer sleeve is arranged at the piston of the secondary cylinder piston rod.
[0015] Further improvement lies in that when the primary cylinder piston moves to contact the primary cylinder head, the maximum stroke of the primary oil cylinder is realized.
[0016] Further improvement lies in that when the secondary cylinder piston rod moves to contact the secondary cylinder guide sleeve, the maximum stroke of the secondary oil cylinder is realized.
[0017] 3. Beneficial effects:
[0018] Compared with the prior art, the technical scheme has the following beneficial effects:
[0019] 1. In the multi-stage hydraulic cylinder, the secondary cylinder barrel adopts a sandwich structure for oil passage transition, so that the sealing element is prevented from being directly passed through the oil port and from being scratched, and the service life of the hydraulic cylinder is improved.
[0020] 2. The conventional multi-stage cylinder needs to purchase special sealing elements for multi-stage cylinders, and the scheme can improve the interchangeability of the sealing elements and reduce the production organization cost.
[0021] 3. When the standard series of the hydraulic cylinder pipe material does not meet the actual use size, the inner and outer sandwich structures can be adopted for matching.
[0022] 4. The inner and outer sandwich structures can be filled with cooling circulating liquid and are used for the hydraulic cylinder in high-temperature and special environments. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 It is a structure schematic view of the existing multi-stage hydraulic cylinder of the utility model;
[0024] Figure 2 It is a starting state structure schematic view of the multi-stage hydraulic cylinder avoiding the sealing element passing through the hole provided by the utility model;
[0025] Figure 3 It is a part structure enlarged schematic view of the utility model; Figure 2
[0026] Figure 4 It is a schematic view of the primary oil cylinder reaching the limit state in the multi-stage hydraulic cylinder avoiding the sealing element passing through the hole provided by the utility model;
[0027] Figure 5 The utility model provides a kind of avoid sealing piece via hole multistage hydraulic oil cylinder middle stage oil cylinder and secondary oil cylinder reach limit state schematic diagram.
[0028] Reference Signs:
[0029] 1-primary cylinder;2-secondary cylinder;3-primary cylinder piston;4-secondary cylinder guide sleeve;5-inner cylinder;6-outer cylinder;7-cylinder bottom;8-oil passage one;9-primary cylinder head;10-oil passage two;11-rod cavity oil port;12-rodless cavity oil port;13-secondary cylinder piston rod;14-secondary cylinder buffer sleeve;A-interlayer;B1-primary cylinder rod cavity;B2-secondary cylinder rod cavity;C-rodless cavity. DETAILED DESCRIPTION
[0030] In order to facilitate the understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings, the drawings show several embodiments of the utility model, however, the utility model can be realized in many different forms, and is not limited to the embodiments described herein, on the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.
[0031] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing", "provided with" and other terms should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication between two elements inside. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.
[0032] It should be noted that the structure not introduced in the utility model does not involve the design points and improvement direction of the utility model, adopts prior art, and the content in the above background art belongs to the technical cognition range of the utility model person, because the technical content of the field is vast and complex, therefore, the above content of the present application does not necessarily constitute prior art.
[0033] Reference Figures 2-5 The embodiment provides a kind of avoid sealing piece via hole multistage hydraulic oil cylinder, including cylinder body, the cylinder body includes primary cylinder 1 and the secondary cylinder 2 of primary cylinder 1 inside setting, secondary cylinder 2 one end is fixed with primary cylinder piston 3, the other end is fixed with secondary cylinder guide sleeve 4, secondary cylinder 2 divides the cylinder body into primary cylinder rod cavity B1 and secondary cylinder rod cavity B2, wherein secondary cylinder 2 is both the piston rod of primary oil cylinder, it is also secondary oil cylinder's cylinder tube;
[0034] The secondary cylinder 2 comprises an inner cylinder 5 and an outer cylinder 6, and a sandwich A is formed between the inner cylinder 5 and the outer cylinder 6, facilitating the flow of oil;
[0035] The outer cylinder 6 of the secondary cylinder 2 is provided with an oil channel 8 near the cylinder bottom 7, and the oil channel 8 is connected with the secondary cylinder rod cavity B2; the inner cylinder 5 of the secondary cylinder 2 is provided with an oil channel 10 near the guide sleeve 4, and the oil channel 10 is connected with the primary cylinder rod cavity B1.
[0036] The primary cylinder head 9 is provided with a rod cavity oil port 11, and the rod cavity oil port 11 is connected with the primary cylinder rod cavity B1 and the secondary cylinder rod cavity B2.
[0037] The cylinder bottom 7 is provided with a rodless cavity oil port 12, and the rodless cavity oil port 12 is connected with the rodless cavity C.
[0038] When the rodless cavity oil port 12 or the rod cavity oil port 11 is filled with oil, the secondary cylinder 2 is pushed to reciprocate and work, and the piston sealing element is prevented from passing through the oil channel.
[0039] The above technical scheme is implemented, the secondary cylinder 2 adopts a sandwich structure for oil passage transition, the sealing element is prevented from directly passing through the oil port, the sealing element is prevented from being scratched, and the service life of the hydraulic cylinder is improved.
[0040] In the preferred embodiment, the outer cylinder 6 and the inner cylinder 5 are sealingly arranged to prevent oil leakage.
[0041] In the preferred embodiment, the secondary cylinder piston rod 13 is arranged to limit the sliding in the cylinder body, and the secondary cylinder buffer sleeve 14 is arranged at the piston of the secondary cylinder piston rod 13 (near the cylinder bottom 7).
[0042] In the preferred embodiment, the annular area of the secondary cylinder rod cavity B2 is greater than the annular area of the primary cylinder rod cavity B1, when the rod cavity oil port 11 is filled with oil, because the annular area of the secondary cylinder rod cavity B2 is greater than the annular area of the primary cylinder rod cavity B1, the force borne by the secondary cylinder piston rod 13 is greater than the force borne by the secondary cylinder 2, the secondary cylinder piston rod 13 is retracted first, and after complete retraction, the secondary cylinder 2 is further retracted.
[0043] In the preferred embodiment, when the primary cylinder piston 3 moves to contact the primary cylinder head 9, the maximum stroke of the primary oil cylinder is achieved.
[0044] In the preferred embodiment, when the secondary cylinder piston rod 13 moves to contact the secondary cylinder guide sleeve 4, the maximum stroke of the secondary oil cylinder is achieved.
[0045] The cylinder bottom 7, the primary cylinder piston 3, the secondary cylinder piston, and the cylinder body form a rodless cavity.
[0046] The initial state is as follows Figure 2As shown, when the rodless cavity oil port 12 is filled with oil, the secondary cylinder barrel 2 and the secondary cylinder piston rod 13 are simultaneously extended outwards under the action of pressure; when the secondary cylinder barrel 2 is extended to the position where the primary cylinder head 9 contacts the primary cylinder piston 3, the limit position is reached, and the secondary cylinder piston rod 13 continues to extend, as shown in Figure 4 As shown, when the secondary cylinder guide sleeve 4 contacts the secondary cylinder buffer sleeve 14, the secondary cylinder piston rod 13 reaches the limit position, at which time the hydraulic cylinder reaches the maximum length, as shown in Figure 5 As shown, the hydraulic oil in the secondary cylinder rod cavity B2 flows into the interlayer A through the oil passage two 10, and then flows into the primary cylinder rod cavity B1 through the oil passage one 8, and then returns to the system through the rod cavity oil port 11 of the secondary cylinder rod cavity B2.
[0047] When the rod cavity oil port 11 is filled with oil, the pressure transmission path is rod cavity oil port 11→primary cylinder rod cavity B1→oil passage one 8→interlayer A→oil passage two 10→secondary cylinder rod cavity B2, and because the annular area of the secondary cylinder rod cavity B2 is larger than that of the primary cylinder rod cavity B1, the force borne by the secondary cylinder piston rod 13 is greater than that borne by the secondary cylinder barrel 2, so that the secondary cylinder piston rod 13 is retracted first, and after complete retraction, the secondary cylinder barrel 2 continues to retract. The oil in the rodless cavity C directly returns to the oil tank through the rodless cavity oil port 12.
[0048] In this process, because the oil passage one 8 of the outer barrel 6 is arranged at the piston end, the sealing element of the primary hydraulic cylinder guide sleeve will not pass through the oil passage during reciprocating movement; at the same time, because the oil passage two 10 of the inner barrel 5 is arranged at the guide sleeve end, the sealing element of the secondary hydraulic cylinder piston 13 will not pass through the oil passage, thereby fundamentally avoiding the problem of scratching of the sealing element.
[0049] The above-described embodiments only express certain implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present application; it should be pointed out that, for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application; therefore, the protection scope of the present application should be subject to the appended claims.
Claims
1. A multi-stage hydraulic cylinder with seal avoidance of the over-penetrating, comprising a cylinder body, the cylinder body comprising a primary cylinder barrel and a secondary cylinder barrel disposed within the primary cylinder barrel, characterized in that: One end of the secondary cylinder is fixed with the primary cylinder piston, and the other end is fixed with the secondary cylinder guide sleeve, the secondary cylinder divides the cylinder body into the primary cylinder rod cavity and the secondary cylinder rod cavity, the secondary cylinder comprises an inner cylinder and an outer cylinder, and a sandwich is formed between the inner cylinder and the outer cylinder; The outer cylinder of the secondary cylinder is provided with an oil channel one near the cylinder bottom end, the oil channel one is communicated with the secondary cylinder rod cavity, the inner cylinder of the secondary cylinder is provided with an oil channel two near the guide sleeve end, and the oil channel two is communicated with the primary cylinder rod cavity; The primary cylinder head is provided with a rod cavity oil port, the rod cavity oil port is communicated with the primary cylinder rod cavity and the secondary cylinder rod cavity; The cylinder bottom is provided with a rodless cavity oil port, and the rodless cavity oil port is communicated with the rodless cavity.
2. The multi-stage hydraulic cylinder of claim 1, wherein: The outer cylinder and the inner cylinder are sealed.
3. The multi-stage hydraulic cylinder of claim 1, wherein: The annular area of the secondary cylinder rod cavity is greater than that of the primary cylinder rod cavity.
4. The multi-stage hydraulic cylinder of claim 1, wherein: The cylinder body is provided with a secondary cylinder piston rod which is limited to slide.
5. The multi-stage hydraulic cylinder of claim 1, wherein: When the primary cylinder piston moves to contact the primary cylinder head, the maximum stroke of the primary oil cylinder is realized.
6. The multi-stage hydraulic cylinder of claim 1, wherein: When the secondary cylinder piston rod moves to contact the secondary cylinder guide sleeve, the maximum stroke of the secondary oil cylinder is realized.