Two-stage hydraulic telescopic cylinder and engineering machinery telescopic arm

Abstract

The utility model relates to a two-stage hydraulic telescopic cylinder which comprises a first oil cylinder and a second oil cylinder. The first oil cylinder comprises a first cylinder body, a first piston rod, a first piston piece, a first cylinder bottom block and a first rod end block. The telescopic oil pipe penetrates through the first piston rod, an inlet of the telescopic oil pipe is formed in the first rod end block, and an outlet of the telescopic oil pipe is formed in the first cylinder bottom block; an outer oil pipe is connected between a telescopic oil pipe outlet of the first oil cylinder and an inlet of the second oil cylinder. The telescopic arm of the engineering machinery comprises a first-stage suspension arm, a second-stage suspension arm, a third-stage suspension arm and a fourth-stage suspension arm, and the two-stage hydraulic telescopic cylinder is adopted on the telescopic arm. An operator can directly control the second oil cylinder to stretch out and draw back through an inlet in the first rod end block, and therefore the first oil cylinder and the second oil cylinder can be independently controlled to stretch out and draw back.

Description

Technical Field

[0001] The utility model relates to the field of oil cylinders, in particular to a two-stage hydraulic telescopic cylinder and an engineering machinery telescopic arm. Background Art

[0002] Telescopic arms of construction machinery often require hydraulic cylinders to extend and retract. On the basis of the same maximum extension length, in order to save space, the number of telescopic sections needs to be increased, and two hydraulic cylinders need to be used in series. Generally, two hydraulic cylinders are used in series, one cylinder has a large load and the other cylinder has a small load. The hydraulic cylinders are extended step by step during operation. This mode has the following disadvantages: when the telescopic arm is extended or retracted, since the two hydraulic cylinders have the same specifications, the one with a small load extends first and the one with a large load extends later, and the extension and retraction order of the telescopic sections cannot be controlled. Utility Model Content

[0003] The technical problem to be solved by the utility model is: to overcome the deficiencies of the prior art, to provide a two-stage hydraulic telescopic cylinder and an engineering machinery telescopic arm, and to solve the problem that the telescopic sequence between telescopic sections in a traditional mechanical telescopic arm cannot be actively controlled.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] First aspect:

[0006] A two-stage hydraulic telescopic cylinder is provided, comprising a No. 1 oil cylinder and a No. 2 oil cylinder;

[0007] The No. 1 oil cylinder comprises a first cylinder body, a first piston rod, a first piston member, a first cylinder bottom block and a first rod end block; the inner end of the first piston rod extends into the first cylinder body and is connected to the first piston member, the outer end of the first piston rod is fixedly connected to the first rod end block, at least one first oil guide pipe is arranged in the first piston rod, the inlet of the first oil guide pipe is opened at the first rod end block, and the outlet of the first oil guide pipe is connected to the rodless cavity of the No. 1 oil cylinder; a telescopic oil pipe is arranged between the first rod end block and the first cylinder bottom block, the telescopic oil pipe passes through the first piston rod, the inlet of the telescopic oil pipe is opened at the first rod end block, and the outlet of the telescopic oil pipe is opened at the first cylinder bottom block;

[0008] The second oil cylinder comprises a second cylinder body, a second piston rod, a second piston member, a second cylinder bottom block and a second rod end block, a second oil guide pipe is arranged in the second piston rod, an inlet of the second oil guide pipe is opened in the second rod end block, and an outlet of the second oil guide pipe is connected to the rodless chamber of the second oil cylinder;

[0009] An external oil pipe is connected between the telescopic oil pipe outlet of the No. 1 oil cylinder and the inlet of the No. 2 oil cylinder.

[0010] Further, the telescopic oil pipe includes a left oil pipe and a right oil pipe;

[0011] One end of the right oil pipe is fixedly connected to the first rod end block, and the other end of the right oil pipe extends into the piston rod;

[0012] One end of the left oil pipe is fixedly connected to the first cylinder bottom block, and the other end of the left oil pipe extends into the right oil pipe. A guide piston is arranged on the left oil pipe to form a sliding fit between the inner walls of the left oil pipe and the right oil pipe, and the inner cavity of the left oil pipe is connected with the inner cavity of the right oil pipe.

[0013] Furthermore, the first piston member is sleeved on the first piston rod and forms a step fit with the first piston rod;

[0014] The first piston rod end is covered with a pressure cover, and a guide sleeve is arranged between the pressure cover and the first piston rod. The pressure cover and the first piston rod are fastened with bolts. The pressure cover axially presses the guide sleeve on the end of the first piston rod. A first annular cavity is formed between the pressure cover and the first piston rod, and the first annular cavity is connected with the first oil guide pipe. A through hole is provided on the pressure cover to connect the first annular cavity with the rodless cavity. The telescopic oil pipe passes through the guide sleeve and forms a sealed sliding fit with the guide sleeve.

[0015] Furthermore, a joint and a second annular cavity are arranged in the first cylinder bottom block, a through hole is provided on the joint so that the inner cavity of the joint is connected to the second annular cavity, the joint is fixedly connected to the telescopic oil pipe so that the telescopic oil pipe is connected to the second annular cavity, and the telescopic oil pipe outlet on the first cylinder bottom block is connected to the second annular cavity.

[0016] Furthermore, an axial step is formed between the joint and the first cylinder bottom block, the inner end of the joint is connected to the telescopic oil pipe, and the outer end of the joint extends out of the first cylinder bottom block and is connected to the locking nut, which is axially locked through the locking nut to fix the joint in the first cylinder bottom block.

[0017] Second aspect:

[0018] Provided is a telescopic arm of an engineering machinery, comprising a primary boom, a secondary boom, a tertiary boom and a quaternary boom, wherein the telescopic arm adopts the above-mentioned two-stage hydraulic telescopic cylinder;

[0019] The first cylinder of the two-stage hydraulic telescopic cylinder is connected to the first-stage boom and the third-stage boom;

[0020] The second oil cylinder of the two-stage hydraulic telescopic cylinder is connected to the second-stage boom and the fourth-stage boom.

[0021] The beneficial effects of the utility model are:

[0022] The two-stage hydraulic telescopic cylinder of the utility model is improved on the basis of the ordinary double-cylinder series connection. A telescopic oil pipe is added in the No. 1 oil cylinder to connect with the No. 2 oil cylinder, so that the operator can directly control the No. 2 oil cylinder to telescope through the inlet on the first rod end block, thereby realizing the telescopic movement of the No. 1 oil cylinder and the No. 2 oil cylinder can be independently controlled.

[0023] The engineering machinery telescopic arm of the utility model can start the corresponding load oil cylinder according to the actual load, thereby improving the safety and stability of the telescopic arm during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described below in conjunction with the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the utility model's hydraulic telescopic cylinder in a retracted state;

[0026] Figure 2 This is a schematic diagram of the first cylinder of the utility model hydraulic telescopic cylinder in the extended state;

[0027] Figure 3 This is a schematic diagram of the No. 1 oil cylinder in a retracted state;

[0028] Figure 4 This is a schematic diagram of the No. 1 oil cylinder in the extended state;

[0029] Figure 5 This is the schematic diagram of the No. 2 oil cylinder;

[0030] Figure 6 It is a schematic diagram between the first cylinder bottom block and the joint;

[0031] Figure 7 It is a schematic diagram of the telescopic tube;

[0032] Figure 8 It is a schematic diagram of the gland;

[0033] Fig. 9 is a schematic diagram of the guide sleeve;

[0034] 1. No. 1 oil cylinder, 11. First cylinder body, 12. First piston rod, 13. First piston member, 14. First cylinder bottom block, 15. First rod end block, 16. First oil guide pipe, 17. Gland, 18. Guide sleeve, 19. Joint;

[0035] 2. No. 2 oil cylinder, 21. second cylinder body, 22. second piston rod, 23. second piston member, 24. second cylinder bottom block, 25. second rod end block, 26. second oil guide pipe;

[0036] 3. Telescopic oil pipe, 31. Left oil pipe, 32. Right oil pipe, 33. Guide piston;

[0037] 41, first annular cavity, 42, second annular cavity;

[0038] 5. External oil pipe. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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.

[0040] The present application provides a two-stage hydraulic telescopic cylinder, which is described in detail below. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0041] In order to solve the technical problem that the conventional telescopic cylinder used in the telescopic arm in the prior art causes the booms of each level in the telescopic arm to be able to be extended and retracted in sequence, and causes the telescopic arm with a small load to be able to be extended and retracted first and the telescopic arm with a large load to be able to be extended and retracted later, an embodiment of the present application provides a two-stage hydraulic telescopic cylinder, which is described in detail below.

[0042] like Figures 1 to 9 As shown, a two-stage hydraulic telescopic cylinder includes a No. 1 oil cylinder 1 and a No. 2 oil cylinder 2;

[0043] The No. 1 oil cylinder 1 comprises a first cylinder body 11, a first piston rod 12, a first piston member 13, a first cylinder bottom block 14 and a first rod end block 15; the inner end of the first piston rod 12 extends into the first cylinder body 11 and is connected to the first piston member 13, the outer end of the first piston rod 12 is fixedly connected to the first rod end block 15, at least one first oil guide pipe 16 is arranged in the first piston rod 12, the inlet of the first oil guide pipe 16 is opened at the first rod end block 15, and the outlet of the first oil guide pipe 16 is connected to the rodless chamber of the No. 1 oil cylinder 1; a telescopic oil pipe 3 is arranged between the first rod end block 15 and the first cylinder bottom block 14, the telescopic oil pipe 3 passes through the first piston rod 12, the inlet of the telescopic oil pipe 3 is opened at the first rod end block 15, and the outlet of the telescopic oil pipe 3 is opened at the first cylinder bottom block 14;

[0044] The No. 2 oil cylinder 2 includes a second cylinder body 21, a second piston rod 22, a second piston member 23, a second cylinder bottom block 24 and a second rod end block 25. A second oil guide pipe 26 is arranged in the second piston rod 22. The inlet of the second oil guide pipe 26 is opened in the second rod end block 25, and the outlet of the second oil guide pipe 26 is connected to the rodless chamber of the No. 2 oil cylinder 2; the second oil guide pipe 26 is fixed in the second piston rod 22.

[0045] An external oil pipe 5 is connected between the outlet of the telescopic oil pipe 3 of the No. 1 oil cylinder 1 and the inlet of the No. 2 oil cylinder 2 .

[0046] In this embodiment, the number of the first oil guiding pipes 16 is two.

[0047] like Figure 3 Figure 4 As shown, the oil hole opened by the first oil guide pipe 16 on the first rod end block 15 is the first oil inlet hole. By supplying oil to the first oil inlet hole, the hydraulic oil can be input into the rodless cavity of the No. 1 cylinder 1 through the first oil guide pipe 16, thereby making the No. 1 cylinder 1 extend and retract.

[0048] The oil hole of the telescopic oil pipe 3 on the first rod end block 15 is the second oil inlet hole. By supplying oil to the second oil inlet hole, the hydraulic oil is sent to the rodless cavity of the second oil cylinder 2 through the telescopic oil pipe 3 and the external oil pipe 5, thereby controlling the second oil cylinder 2 to extend.

[0049] When input is made to the first oil inlet and the second oil inlet at the same time, the No. 1 oil cylinder 1 and the No. 2 oil cylinder 2 can be synchronously controlled to operate.

[0050] Specifically, as an optional implementation in this embodiment, Figure 3 Figure 4 as well as Figure 7 As shown, the telescopic oil pipe 3 includes a left oil pipe 31 and a right oil pipe 32;

[0051] One end of the right oil pipe 32 is fixedly connected to the first rod end block 15, and the other end of the right oil pipe 32 extends into the piston rod;

[0052] One end of the left oil pipe 31 is fixedly connected to the first cylinder bottom block 14, and the other end of the left oil pipe 31 extends into the right oil pipe 32. A guide piston 33 is provided on the left oil pipe 31 to form a sliding fit between the inner walls of the left oil pipe 31 and the right oil pipe 32, and the inner cavity of the left oil pipe 31 is connected to the inner cavity of the right oil pipe 32.

[0053] The telescopic oil pipe 3 passes through the center of the first piston rod 12. When the hydraulic oil is delivered to the No. 2 oil cylinder 2 through the telescopic oil pipe 3, the operation of the No. 1 oil cylinder 1 is not affected, thereby realizing independent control of the No. 2 oil cylinder 2.

[0054] Specifically, as an optional implementation in this embodiment, Figure 3 Figure 4 As shown, the first piston member 13 is sleeved on the first piston rod 12 and forms a step fit with the first piston rod 12;

[0055] A pressure cover 17 is provided at the end of the first piston rod 12, and a guide sleeve 18 is arranged between the pressure cover 17 and the first piston rod 12. The pressure cover 17 and the first piston rod 12 are fastened with bolts. The pressure cover 17 axially presses the guide sleeve 18 at the end of the first piston rod 12. A first annular cavity 41 is formed between the pressure cover 17 and the first piston rod 12, and the first annular cavity 41 is communicated with the first oil guide pipe 16. A through hole is provided on the pressure cover 17 to communicate the first annular cavity 41 with the rodless cavity. The telescopic oil pipe 3 passes through the guide sleeve 18 and forms a sealed sliding fit with the guide sleeve 18.

[0056] like Figure 7 Figure 8 As shown, a radial groove is provided on the guide sleeve 18 on the side facing the first oil guide pipe 16 , and the hydraulic oil delivered from the first oil guide pipe 16 flows into the gland 17 , i.e., the first annular cavity 41 , through the radial groove, and then flows into the rodless cavity through the radial through hole provided on the gland 17 .

[0057] Specifically, as an optional implementation in this embodiment, Figure 6 As shown, a joint 19 and a second annular cavity 42 are provided in the first cylinder bottom block 14, a through hole is provided on the joint 19 so that the inner cavity of the joint 19 is connected to the second annular cavity 42, the joint 19 is fixedly connected to the telescopic oil pipe 3 so that the telescopic oil pipe 3 is in communication with the second annular cavity 42, and the outlet of the telescopic oil pipe 3 on the first cylinder bottom block 14 is in communication with the second annular cavity 42.

[0058] Specifically, as an optional implementation in this embodiment, Figure 6 As shown, an axial step is formed between the joint 19 and the first cylinder bottom block 14, the inner end of the joint 19 is connected to the telescopic oil pipe 3, and the outer end of the joint 19 extends out of the first cylinder bottom block 14 and is connected to the locking nut, which is axially locked by the locking nut to fix the joint 19 in the first cylinder bottom block 14.

[0059] As an optional implementation in this embodiment, the left oil pipe 31 of the telescopic oil pipe 3 passes through the guide sleeve 18 and forms a sliding seal with the guide sleeve 18. The left end of the left oil pipe 31 is fixedly connected to the joint 19, and the right end of the left oil pipe 31 is inserted into the right oil pipe 32 for sliding seal. The right end of the right oil pipe 32 is welded and fixed to the rod end block, and the left end of the right oil pipe 32 extends into the guide sleeve 18, and a seal is formed between the outer wall of the right oil pipe 32 and the guide sleeve 18.

[0060] In the two-stage hydraulic telescopic cylinder of the utility model, the operating load of the first oil cylinder 1 is greater than that of the second oil cylinder 2.

[0061] When the No. 1 cylinder 1 is extended alone, hydraulic oil is input through the first oil inlet hole. The hydraulic oil first enters the first annular cavity 41 formed between the pressure cover 17 and the first piston rod 12, and then flows into the rodless cavity through the through hole on the pressure cover 17, driving the first cylinder body 11 and the first cylinder bottom block 14 to move and extend.

[0062] When the No. 2 oil cylinder 2 is extended alone, hydraulic oil is input through the second oil inlet hole, and the hydraulic oil is sequentially delivered to the second oil guide pipe 26 of the No. 2 oil cylinder 2 through the right oil pipe 32, the left oil pipe 31, the joint 19, the second annular cavity 42, and the outer oil pipe 5. The second oil guide pipe 26 passes through the second piston rod 22. The hydraulic oil can therefore be delivered to the rodless cavity of the No. 2 oil cylinder 2 through the second oil guide pipe 26, driving the second cylinder body 21 and the second cylinder bottom block 24 of the No. 2 oil cylinder 2 to move.

[0063] Another embodiment of the present application provides a telescopic arm of an engineering machinery, which is described in detail below.

[0064] A telescopic arm of an engineering machinery, comprising a primary boom, a secondary boom, a tertiary boom and a quaternary boom, wherein the telescopic arm adopts the above-mentioned two-stage hydraulic telescopic cylinder;

[0065] The first cylinder 1 of the two-stage hydraulic telescopic cylinder is connected to the first-stage boom and the third-stage boom;

[0066] The second oil cylinder 2 of the two-stage hydraulic telescopic cylinder is connected to the second-stage boom and the fourth-stage boom.

[0067] In this embodiment, the sliding matching structure between the four booms is the existing technology. Now a newly designed two-stage hydraulic telescopic cylinder is applied to the telescopic boom of the engineering machinery, so that when the telescopic arm is in operation, the telescopic arm can independently control the telescopic movement between the first-stage boom and the third-stage boom, the second-stage boom and the fourth-stage boom, or the four booms can be controlled to extend together.

[0068] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to technical personnel in this field, and their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods.

[0069] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0071] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0072] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0073] In addition, each functional unit in each embodiment of the present utility model may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0074] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A two-stage hydraulic telescopic cylinder, characterized in that: It comprises a No. 1 oil cylinder (1) and a No. 2 oil cylinder (2); The No. 1 oil cylinder (1) comprises a first cylinder body (11), a first piston rod (12), a first piston member (13), a first cylinder bottom block (14) and a first rod end block (15); the inner end of the first piston rod (12) extends into the first cylinder body (11) and is connected to the first piston member (13); the outer end of the first piston rod (12) is fixedly connected to the first rod end block (15); at least one first oil guide pipe (16) is arranged in the first piston rod (12); the inlet of the first oil guide pipe (16) is opened at the first rod end block (15); the outlet of the first oil guide pipe (16) is communicated with the rodless chamber of the No. 1 oil cylinder (1); a telescopic oil pipe (3) is arranged between the first rod end block (15) and the first cylinder bottom block (14); the telescopic oil pipe (3) passes through the first piston rod (12); the inlet of the telescopic oil pipe (3) is opened at the first rod end block (15); the outlet of the telescopic oil pipe (3) is opened at the first cylinder bottom block (14); The second oil cylinder (2) comprises a second cylinder body (21), a second piston rod (22), a second piston member (23), a second cylinder bottom block (24) and a second rod end block (25); a second oil guide pipe (26) is arranged inside the second piston rod (22); an inlet of the second oil guide pipe (26) is opened at the second rod end block (25); and an outlet of the second oil guide pipe (26) is connected to the rodless chamber of the second oil cylinder (2); An external oil pipe (5) is connected between the outlet of the telescopic oil pipe (3) of the No. 1 oil cylinder (1) and the inlet of the No. 2 oil cylinder (2).

2. The two-stage hydraulic telescopic cylinder according to claim 1 is characterized in that: The telescopic oil pipe (3) comprises a left oil pipe (31) and a right oil pipe (32); One end of the right oil pipe (32) is fixedly connected to the first rod end block (15), and the other end of the right oil pipe (32) extends into the piston rod; One end of the left oil pipe (31) is fixedly connected to the first cylinder bottom block (14), and the other end of the left oil pipe (31) extends into the right oil pipe (32). A guide piston (33) is provided on the left oil pipe (31) so that a sliding fit is formed between the inner walls of the left oil pipe (31) and the right oil pipe (32), and the inner cavity of the left oil pipe (31) is communicated with the inner cavity of the right oil pipe (32).

3. The two-stage hydraulic telescopic cylinder according to claim 1 is characterized in that: The first piston member (13) is sleeved on the first piston rod (12) and forms a step fit with the first piston rod (12); A pressure cover (17) is provided at the end of the first piston rod (12), a guide sleeve (18) is arranged between the pressure cover (17) and the first piston rod (12), the pressure cover (17) and the first piston rod (12) are fastened by bolts, the pressure cover (17) axially presses the guide sleeve (18) against the end of the first piston rod (12), a first annular cavity (41) is formed between the pressure cover (17) and the first piston rod (12), the first annular cavity (41) is connected to the first oil guide pipe (16), a through hole is provided on the pressure cover (17) so that the first annular cavity (41) is connected to the rodless cavity, and the telescopic oil pipe (3) passes through the guide sleeve (18) and forms a sealed sliding fit with the guide sleeve (18).

4. The two-stage hydraulic telescopic cylinder according to claim 1 is characterized in that: A joint (19) and a second annular cavity (42) are arranged in the first cylinder bottom block (14); a through hole is provided in the joint (19) so that the inner cavity of the joint (19) is connected to the second annular cavity (42); the joint (19) is fixedly connected to the telescopic oil pipe (3) so that the telescopic oil pipe (3) is in communication with the second annular cavity (42); and an outlet of the telescopic oil pipe (3) on the first cylinder bottom block (14) is in communication with the second annular cavity (42).

5. The two-stage hydraulic telescopic cylinder according to claim 4 is characterized in that: An axial step is formed between the joint (19) and the first cylinder bottom block (14); the inner end of the joint (19) is connected to the telescopic oil pipe (3); the outer end of the joint (19) extends out of the first cylinder bottom block (14) and is connected to a locking nut, which is axially locked to fix the joint (19) in the first cylinder bottom block (14).

6. A telescopic boom of an engineering machinery, comprising a primary boom, a secondary boom, a tertiary boom and a quaternary boom, characterized in that: The telescopic arm adopts the two-stage hydraulic telescopic cylinder described in any one of claims 1 to 5; The first oil cylinder (1) of the two-stage hydraulic telescopic cylinder is connected to the first-stage boom and the third-stage boom; The second oil cylinder (2) of the two-stage hydraulic telescopic cylinder is connected to the second-stage boom and the fourth-stage boom.

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