Multi-stage oil cylinder

Abstract

The utility model provides a multi-stage oil cylinder which comprises an outer cylinder barrel and an end cover, and the end cover is provided with a rodless cavity oil inlet channel and a rod cavity oil inlet channel. The outer cylinder barrel is provided with an external oil pipe, one end of the external oil pipe communicates with the rod cavity oil inlet channel, and the other end of the external oil pipe communicates with a rod end inner cavity of the outer cylinder barrel. At least two stages of telescopic assemblies are arranged in the outer cylinder barrel, each telescopic assembly comprises a piston and an inner cylinder barrel, and one end of each inner cylinder barrel is connected with the upper-stage piston; the upper-stage piston is provided with a rodless cavity oil passing channel which is used for communicating rodless cavities between two adjacent stages of pistons; the upper-stage piston is further provided with an oil passing piece with a first rod cavity oil passing channel and a built-in oil pipe, one end of the built-in oil pipe is communicated with the oil passing piece, and the other end of the built-in oil pipe penetrates through the lower-stage piston; one end of the next-stage built-in oil pipe sleeves the other end of the previous-stage built-in oil pipe, and a gap is formed between the next-stage built-in oil pipe and the previous-stage built- The first rod cavity oil passing channel of each stage is communicated with the rod cavity of the corresponding stage; oil can be prevented from entering from the piston rod head.

Description

Technical Field

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

[0002] Traditional multi-stage cylinders mostly take in oil from the piston rod head at the rod chamber end of the cylinder. Although this setting can achieve the purpose of telescoping the multi-stage cylinder, when each stage of the piston rod is extended or retracted, it must pass through the oil inlet port at the rod chamber end of the outer cylinder barrel, causing the main seal on the piston to be easily damaged, seriously affecting the quality of the main engine manufacturer and the cylinder manufacturer, and inevitably increasing the after-sales cost.

[0003] Therefore, there is an urgent need for a multi-stage oil cylinder that can avoid oil inflow from the piston rod head at the rod cavity end, thereby improving the quality of the multi-stage oil cylinder. Utility Model Content

[0004] The utility model aims to provide a multi-stage oil cylinder, aiming to solve the technical problem of poor quality of the traditional multi-stage oil cylinder caused by unreasonable arrangement of the small cavity oil inlet port.

[0005] To achieve the above object, the utility model provides a multi-stage oil cylinder, comprising an outer cylinder barrel and an end cover sealed at the bottom of the outer cylinder barrel, wherein the end cover is respectively provided with a rodless chamber oil inlet channel and a rod chamber oil inlet channel;

[0006] An external oil pipe is provided on the outer wall of the outer cylinder, one end of the external oil pipe is connected to the oil inlet channel of the rod chamber, and the other end is connected to the inner cavity of the rod end of the outer cylinder;

[0007] At least two stages of telescopic components are arranged in sequence in the outer cylinder, and the telescopic components include a piston and an inner cylinder slidably arranged in each stage of the cylinder, one end of the inner cylinder is connected to the piston of the previous stage, and the other end extends toward the rod end of the outer cylinder;

[0008] The upper piston is provided with a rodless chamber oil passage for connecting the rodless chambers between two adjacent pistons; the upper piston is also provided with an oil passage piece having a first rod chamber oil passage and an internal oil pipe connected to the first rod chamber oil passage, one end of the internal oil pipe is connected to the oil passage piece, and the other end passes through the lower piston and extends toward the rod end of the outer cylinder;

[0009] One end of the next-stage internal oil pipe is sleeved on the other end of the previous-stage internal oil pipe, and there is a gap between the previous-stage internal oil pipe to allow hydraulic oil to enter the next-stage rod chamber. For details, see Figure 5 ;

[0010] The first rod chamber oil passage of each stage is communicated with the rod chamber of the corresponding stage.

[0011] As a further improvement of the above solution, the inner cylinder comprises a cylinder body having a hollow inner cavity and a connecting piece arranged at one end of the cylinder body; the connecting piece is fixedly and sealedly connected to the piston of the corresponding stage;

[0012] The oil-passing member is arranged in the connecting member, and the connecting member is further provided with a second rod chamber oil-passing passage in a radial direction thereof, which is communicated with the first rod chamber oil-passing passage.

[0013] As a further improvement of the above solution, the oil-passing member is arranged along the axial direction of the connecting member, and a detachable seal is arranged in the connecting member.

[0014] As a further improvement of the above scheme, the rod end between the outer cylinder and the inner cylinder adjacent thereto, and the rod end between the adjacent inner cylinders are respectively provided with corresponding guide sleeves;

[0015] The guide sleeve is provided with a sealing dustproof component for preventing leakage of hydraulic oil in the rod chamber of the corresponding stage.

[0016] As a further improvement of the above scheme, sealing rings are respectively provided on both sides of the first rod chamber oil passage of the oil-passing member to prevent the hydraulic oil of each level of rod chamber from leaking into each level of rodless chamber.

[0017] As a further improvement of the above scheme, guide rings are provided in the next-stage piston and the next-stage connecting piece, which are used to match the built-in oil pipe of the previous stage to prevent damage to the corresponding built-in oil pipe and the corresponding connecting piece during the extension and retraction process.

[0018] As a further improvement of the above scheme, the rodless chamber oil inlet channel is a through hole penetrating the end cover; the through hole is arranged along the axial direction of the end cover, and its axis is parallel to the axis of the end cover.

[0019] As a further improvement of the above scheme, the rod chamber oil inlet channel includes a first channel and a second channel connected to the first channel, and the axis of the first channel and the axis of the second channel form a preset angle, and the preset angle is preferably 90°;

[0020] Preferably, the first channel is a first blind hole provided on the end cover, the first blind hole is provided along the axial direction of the end cover, and the second channel is a second blind hole provided on the end cover, the second blind hole is provided along the radial direction of the end cover.

[0021] Since the utility model adopts the above technical solution, the beneficial effects of this application are:

[0022] The utility model provides a multi-stage oil cylinder, comprising an outer cylinder barrel and an end cover sealing the bottom of the outer cylinder barrel, and the end cover is respectively provided with a rodless chamber oil inlet channel and a rod chamber oil inlet channel; the outer wall of the outer cylinder barrel is provided with an external oil pipe, one end of the external oil pipe is connected with the rod chamber oil inlet channel, and the other end is connected with the inner cavity of the rod end of the outer cylinder barrel; the outer cylinder barrel is provided with at least two stages of telescopic components which are sequentially sleeved, and the telescopic components include a piston and an inner cylinder barrel which are slidably arranged in each stage of the cylinder barrel, one end of the inner cylinder barrel is connected with the upper stage piston, and the other end extends toward the rod end direction of the outer cylinder barrel; a rodless chamber oil passage is provided on the upper stage piston, one end of the rodless chamber oil passage is connected with the rodless chamber oil inlet channel, and the other end is connected with the rodless chamber of the next stage piston; the upper stage piston is also provided with an oil passing part having a first rod chamber oil passage and a The built-in oil pipe connected to the first rod chamber through the oil channel, one end of the built-in oil pipe is connected to the oil-passing piece, and the other end passes through the next-stage piston and extends toward the rod end of the outer cylinder; one end of the next-stage built-in oil pipe is sleeved on the other end of the previous-stage built-in oil pipe, and there is a gap between the built-in oil pipe of the previous stage to allow hydraulic oil to enter the next-stage rod chamber; the first rod chamber oil channel of each stage is connected with the rod chamber of the corresponding stage; in the utility model, the oil in the external oil pipe is cleverly introduced into the rod chamber of each stage of the piston through the reasonable arrangement of the oil-passing piece and the built-in oil pipe, and there is no need to set the oil inlet of the rod chamber on the piston rod head, thereby reducing the wear of the main seal on the piston and improving the overall quality of the cylinder; at the same time, the rodless chamber oil inlet channel and the rod chamber oil inlet channel are both arranged on the end cover, which is convenient for the main engine hydraulic piping and can save piping space. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 It is a first cross-sectional schematic diagram of a multi-stage oil cylinder disclosed in the utility model;

[0025] Figure 2 for Figure 1 A local enlarged schematic diagram of the I direction;

[0026] Figure 3 for Figure 1 A local enlarged schematic diagram of the J direction;

[0027] Figure 4This is a second cross-sectional schematic diagram of a multi-stage oil cylinder disclosed in the utility model.

[0028] Figure 5 for Figure 4 A local enlarged schematic diagram of the K direction;

[0029] Figure 6 The utility model discloses a cross-sectional schematic diagram of oil inlet from a rod chamber of a multi-stage oil cylinder.

[0030] Reference numerals:

[0031] 1. Outer cylinder; 2. End cover; 3. External oil pipe; 4. Primary piston; 5. Inner cylinder; 51. Cylinder body; 52. Connector; 6. Secondary piston; 7. Secondary piston rod; 8. Oil passage; 9. Internal oil pipe; 10. Screw plug; 11. Guide sleeve; 12. Seal ring; 13. Guide ring;

[0032] a. Oil inlet channel of rodless chamber; b. Oil inlet channel of rod chamber; c. Oil passage channel of rodless chamber; d. Oil passage channel of first rod chamber; e. Oil passage channel of second rod chamber; f. Gap.

[0033] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be noted that all directional indications (such as up, down, etc.) in the implementation mode of the utility model are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0037] Furthermore, the technical solutions between the various implementation modes of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] See also Figure 1-Figure 6 The utility model provides a multi-stage oil cylinder, comprising an outer cylinder barrel 1 and an end cover 2 blocking the bottom of the outer cylinder barrel 1, wherein the end cover 2 is provided with a rodless chamber oil inlet channel a and a rod chamber oil inlet channel b;

[0039] An external oil pipe 3 is provided on the outer wall of the outer cylinder 1, one end of the external oil pipe 3 is connected to the oil inlet channel b of the rod chamber, and the other end is connected to the inner cavity of the rod end of the outer cylinder 1;

[0040] The outer cylinder 1 is provided with at least two telescopic assemblies which are sequentially sleeved, and the telescopic assemblies include a piston and an inner cylinder 5 which are slidably arranged in each stage of the cylinder, one end of the inner cylinder 5 is connected to the piston 4 of the previous stage, and the other end extends toward the rod end of the outer cylinder 1; for details, see Figure 1 In this embodiment, a two-stage oil cylinder is taken as an example for explanation. Specifically, the outer cylinder barrel 1 is provided with a two-stage telescopic assembly which is sequentially sleeved. The outer cylinder barrel 1 is slidably provided with a first-stage piston 4, one end of which is connected to a first-stage piston rod, and the first-stage piston rod has a hollow inner cavity, constituting an inner cylinder barrel 5 of the next stage; the inner cylinder barrel 5 of the next stage is slidably provided with a second-stage piston 6, one end of which is connected to a second-stage piston rod 7, and the second-stage piston rod 7 has a hollow inner cavity;

[0041] In some preferred embodiments, it is a multi-stage oil cylinder with three or more stages, and so on, the piston rod of each stage has a hollow inner cavity, which constitutes the inner cylinder barrel 5 of the next stage, forming a multi-stage oil cylinder;

[0042] A rodless chamber oil passage c is provided on the upper stage piston 4, one end of the rodless chamber oil passage c is communicated with the rodless chamber oil inlet passage a, and the other end is communicated with the rodless chamber of the lower stage piston 4; specifically, in a multi-stage oil cylinder, the rodless chamber oil passage c does not need to be provided on the final stage piston, and in the secondary oil cylinder of this embodiment, the rodless chamber oil passage c only needs to be provided on the first stage piston 4, and the rodless chamber oil passage c is provided through the axial direction of the first stage piston 4, so that the hydraulic oil can quickly enter the rodless chamber of the lower stage;

[0043] The upper-stage piston 4 is also provided with an oil-passing piece 8 having a first rod-chamber oil passage d and an internal oil pipe 9 connected to the first rod-chamber oil passage d, one end of the internal oil pipe 9 being connected to the oil-passing piece 8, and the other end passing through the lower-stage piston 4 and extending toward the rod end of the outer cylinder 1; specifically, in the present embodiment, the first-stage piston 4 is provided with a second rod-chamber oil passage e connected to the first rod-chamber oil passage d along its radial direction, and the second rod-chamber oil passage e is connected to the first-stage rod chamber; the oil-passing piece 8 is a block-shaped piece having a three-way pipe, which can be detachably arranged on the first-stage piston 4, the two ends of the straight section of the three-way pipe are respectively connected to the second rod-chamber oil passage e, and the vertical section of the three-way pipe is connected to the internal oil pipe 9; one end of the lower-stage internal oil pipe 9 is sleeved on the other end of the upper-stage internal oil pipe 9, and a gap f is provided between the upper-stage internal oil pipe 9 and the upper-stage internal oil pipe 9 for hydraulic oil to enter the lower-stage rod chamber;

[0044] The first rod chamber oil passage d of each stage is connected with the rod chamber of the corresponding stage;

[0045] In order to further illustrate the inventive concept of the present invention, the following Figure 6 , the oil inlet of the rod chamber of the secondary oil cylinder is used for explanation; specifically, the hydraulic oil enters from the rod chamber oil inlet channel b, then enters the external oil pipe 3, and flows along the external oil pipe 3 from the rodless end to the rod end, and then enters the rod chamber of the outer cylinder barrel 1. The hydraulic oil entering the rod chamber of the outer cylinder barrel 1, on the one hand, pushes the first-stage piston 4 therein to retract, and on the other hand, enters the first rod chamber oil passage d of the oil passing member 8 from the second rod chamber oil passage e of the first-stage piston rod, and then enters the built-in oil pipe 9 through the oil passing member 8, and then the hydraulic oil passes through the next-stage piston 4 along the built-in oil pipe 9 into the inner chamber of the secondary piston rod 7, and then enters the second rod chamber oil passage e of the secondary piston rod 7 through the gap f between the built-in oil pipe 9 and the secondary piston rod 7, and finally flows into the rod chamber of the secondary inner cylinder barrel 5, and pushes the secondary piston 6 therein to retract, thereby completing the rodless chamber oil inlet and retraction of the secondary oil cylinder; the extension and oil inlet process of the multi-stage oil cylinder, see Figure 1 and Figure 4 , the hydraulic oil enters the rodless chamber of the outer cylinder from the rodless chamber oil inlet channel a and pushes the first-stage piston 4 to extend, and at the same time, the hydraulic oil enters the rodless chamber of the next-stage piston 4 through the rodless chamber oil passage channel c of the first-stage piston 4 and pushes the next-stage piston 4 to extend;

[0046] In the utility model, the oil in the external oil pipe 3 is cleverly introduced into the rod chamber of each level of piston through the reasonable arrangement of the oil-passing piece 8 and the built-in oil pipe 9. There is no need to arrange the oil inlet of the rod chamber on the piston rod head, thereby reducing the wear of the main seal on the piston and improving the overall quality of the cylinder. At the same time, the rodless chamber oil inlet channel a and the rod chamber oil inlet channel b are both arranged on the end cover 2, which is convenient for the main engine hydraulic piping and can save piping space.

[0047] As a preferred embodiment, the inner cylinder 5 comprises a cylinder body 51 having a hollow inner cavity and a connecting piece 52 arranged at one end of the cylinder body 51; the connecting piece 52 is fixedly and sealedly connected to the piston of the corresponding stage;

[0048] The oil-passing member 8 is disposed in the connecting member 52, and the connecting member 52 is further provided with a second rod-cavity oil-passing passage e in radial direction thereof, which is in communication with the first rod-cavity oil-passing passage d;

[0049] For details, see Figure 3 The oil-passing piece 8 is a block-shaped piece with a three-way pipe. Preferably, the oil-passing piece 8 is a cylindrical piece with a three-way pipe. The oil-passing piece 8 is detachably sealed and arranged in the connecting piece 52 through a screw plug 10, and is axially arranged along the connecting piece 52. The first rod chamber oil passage d is a straight pipe section of the three-way pipe, and its two ends are respectively connected to the second rod chamber oil passage e, so that the hydraulic oil in the upper-level rod chamber passes through the second rod chamber oil passage e, the first rod chamber oil passage d, the built-in oil pipe 9 and the gap f in sequence into the next-level rod chamber.

[0050] As a preferred embodiment, the rod end between the outer cylinder 1 and the inner cylinder 5 adjacent thereto, and the rod end between the adjacent inner cylinders 5 are respectively provided with corresponding guide sleeves 11;

[0051] The guide sleeve 11 is provided with a sealing dustproof component to prevent leakage of the hydraulic oil in the rod chamber of the corresponding stage. Specifically, the guide sleeve 11 is provided with a dustproof ring, a piston rod seal, a guide ring 13, an O-ring and other seals to ensure that the hydraulic oil in the rod chamber of the corresponding stage does not leak.

[0052] As a preferred embodiment, see Figure 3 , sealing rings 12 are respectively provided on both sides of the first rod chamber oil passage d of the oil passage member 8, for preventing the hydraulic oil of each level of rod chamber from leaking into each level of rodless chamber;

[0053] Specifically, an O-ring 12 is provided on both sides of the left and right sides of the first rod chamber oil passage d to prevent the hydraulic oil in each rod chamber from entering the rodless chamber of each level through the gap f between the inner cylinder 5 of the next level and the oil block and the built-in oil pipe 9 to cause internal leakage.

[0054] As a preferred embodiment, a guide ring 13 is provided in the lower piston 4 and the lower connecting piece 52, which is used to match the built-in oil pipe 9 of the upper stage to prevent damage to the corresponding built-in oil pipe 9 and the corresponding connecting piece 52 during the telescopic process;

[0055] For details, see Figure 2 A guide ring 13 is provided in the next-stage piston 4, and a guide ring 13 is also provided in the next-stage connecting piece 52, so as to reduce the friction between the corresponding-stage built-in oil pipe 9 and the next-stage connecting piece 52, thereby reducing the damage to the corresponding built-in oil pipe 9 and the corresponding connecting piece 52, thereby improving the quality of the cylinder.

[0056] As a preferred embodiment, the rodless chamber oil inlet passage a is a through hole penetrating the end cover 2 ; the through hole is axially arranged along the end cover 2 , and its axis is parallel to the axis of the end cover 2 .

[0057] The rod chamber oil inlet channel b comprises a first channel and a second channel connected to the first channel in sequence, and the axis of the first channel and the axis of the second channel form a preset angle, and the preset angle is preferably 90°;

[0058] Preferably, the first channel is a first blind hole arranged on the end cover 2, and the first blind hole is arranged axially along the end cover 2, and the second channel is a second blind hole arranged on the end cover 2, and the second blind hole is arranged radially along the end cover 2; one end of the external oil pipe 3 is connected to the opening of the second blind hole, and the opening of the first blind hole is connected to the oil pipe through a joint; with such an arrangement, the oil inlets of the rod chamber and the rodless chamber are both arranged on the end cover 2. Compared with the traditional multi-stage oil cylinder, the oil port of the rod chamber is arranged on the piston rod head at the rod chamber end. The utility model is arranged at the end cover 2 to reduce the wear of the piston, thereby improving the quality of the oil cylinder; it is also beneficial to the piping of the connected hydraulic system and saves piping space.

[0059] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A multi-stage oil cylinder, characterized in that: It comprises an outer cylinder and an end cover sealed at the bottom of the outer cylinder, wherein the end cover is respectively provided with a rodless chamber oil inlet channel and a rod chamber oil inlet channel; An external oil pipe is provided on the outer wall of the outer cylinder, one end of the external oil pipe is connected to the oil inlet channel of the rod chamber, and the other end is connected to the rod chamber of the outer cylinder; At least two stages of telescopic components are arranged in sequence in the outer cylinder, and the telescopic components include a piston and an inner cylinder slidably arranged in each stage of the cylinder, one end of the inner cylinder is connected to the piston of the previous stage, and the other end extends toward the rod end of the outer cylinder; The upper piston is provided with a rodless chamber oil passage for connecting the rodless chambers between two adjacent pistons; the upper piston is also provided with an oil passage piece having a first rod chamber oil passage and an internal oil pipe connected to the first rod chamber oil passage, one end of the internal oil pipe is connected to the oil passage piece, and the other end passes through the lower piston and extends toward the rod end of the outer cylinder; One end of the next-stage internal oil pipe is sleeved on the other end of the previous-stage internal oil pipe, and a gap is formed between the next-stage internal oil pipe and the previous-stage internal oil pipe to allow hydraulic oil to enter the next-stage rod chamber; The first rod chamber oil passage of each stage is communicated with the rod chamber of the corresponding stage.

2. A multi-stage oil cylinder according to claim 1, characterized in that: The inner cylinder comprises a cylinder body having a hollow inner cavity and a connecting piece arranged at one end of the cylinder body; the connecting piece is fixedly and sealedly connected to the piston of the corresponding stage; The oil-passing member is arranged in the connecting member, and the connecting member is further provided with a second rod chamber oil-passing passage in a radial direction thereof, which is communicated with the first rod chamber oil-passing passage.

3. A multi-stage oil cylinder according to claim 2, characterized in that: The oil-passing member is arranged along the axial direction of the connecting member, and a detachable seal is arranged in the connecting member.

4. A multi-stage oil cylinder according to any one of claims 1 to 3, characterized in that: The rod end between the outer cylinder and the inner cylinder adjacent thereto, and the rod end between the adjacent inner cylinders are respectively provided with guide sleeves of corresponding levels; The guide sleeve is provided with a sealing dustproof component for preventing leakage of hydraulic oil in the rod chamber of the corresponding stage.

5. A multi-stage oil cylinder according to any one of claims 1 to 3, characterized in that: Sealing rings are respectively arranged on both sides of the first rod chamber oil passage of the oil-passing member to prevent the hydraulic oil in each level of rod chamber from leaking into each level of rodless chamber.

6. A multi-stage oil cylinder according to any one of claims 1 to 3, characterized in that: A guide ring is provided inside the next-stage piston and the next-stage connecting piece, which is used to match the built-in oil pipe of the previous stage to prevent damage to the corresponding built-in oil pipe and the corresponding connecting piece during the expansion and contraction process.

7. A multi-stage oil cylinder according to any one of claims 1 to 3, characterized in that: The rodless chamber oil inlet passage is a through hole penetrating the end cover; the through hole is arranged along the axial direction of the end cover, and the axis thereof is parallel to the axis of the end cover.

8. A multi-stage oil cylinder according to claim 7, characterized in that: The rod chamber oil inlet passage comprises a first passage and a second passage in sequential communication with the first passage, and an axis of the first passage and an axis of the second passage form a preset angle.

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