Buffer assembly for self-locking hydraulic device

Abstract

The utility model discloses a buffer assembly for a self-locking hydraulic device, the self-locking hydraulic device comprises an outer cylinder and a working piston arranged in the outer cylinder, the buffer assembly comprises a retraction end cover arranged at one end of the outer cylinder, and a closed retraction cavity is formed between the retraction end cover and the working piston in the outer cylinder; a buffer piston is arranged in the retraction cavity and divides the retraction cavity into an independent buffer cavity and an oil return cavity, and a first spring is arranged between the buffer piston and the retraction end cover. According to the hydraulic device, the retraction cavity is divided into the independent buffer cavity and the independent oil return cavity through the buffer piston, the oil return cavity achieves the function of an original retraction cavity, and when the working piston moves towards the retraction end to a locking position, a self-locking structure of the hydraulic device can achieve the self-locking function; and the separated buffer cavity independently realizes a buffer function. Thus, by means of the buffering assembly, in-place buffering can be achieved under the condition that the in-place self-locking function of an original hydraulic device is not interfered.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic devices, and in particular relates to a buffer component for a self-locking hydraulic device. Background Art

[0002] Traditional self-locking hydraulic devices primarily utilize slider locks or ball locks. These self-locking mechanisms require the rebound force of the locking spring to push the locking ring axially along the piston rod. The ring then pushes the slider or ball along the piston rod radially to the locking groove, locking the device. If this type of self-locking hydraulic device were to be buffered, extremely high pressure would build up within the buffer chamber, which would also act on the locking ring. This pressure would render the locking spring unable to overcome the pressure, preventing the locking ring from moving and thus preventing self-locking. Therefore, traditional self-locking hydraulic devices cannot simultaneously achieve self-locking and buffering. Summary of the Invention

[0003] The purpose of the utility model is to provide a buffer assembly for a self-locking hydraulic device, so as to solve the problem that the existing self-locking hydraulic device cannot achieve in-place buffering.

[0004] The utility model is achieved through the following technical solutions:

[0005] A buffer assembly for a self-locking hydraulic device, the self-locking hydraulic device comprising an outer cylinder and a working piston disposed within the outer cylinder, the buffer assembly comprising a retractable end cap disposed at one end of the outer cylinder, and a closed retractable cavity formed within the outer cylinder between the retractable end cap and the working piston;

[0006] A buffer piston is provided in the retraction chamber and divides the retraction chamber into an independent buffer chamber and an oil return chamber, and a first spring is provided between the buffer piston and the retraction end cover;

[0007] The retractable end cover is provided with an extension portion extending into the oil return chamber, and the buffer piston is fitted on the extension portion;

[0008] An oil return pipeline is provided on the retracted end cover, and an outlet end of the oil return pipeline is provided at the end of the extension portion, so that the oil return pipeline is connected to the oil return chamber;

[0009] The retractable end cover is provided with a buffer pipeline and a one-way pipeline respectively connected to the buffer cavity;

[0010] The buffer pipeline, the one-way pipeline and the oil return pipeline are connected at one end of the inlet;

[0011] A throttling component is provided in the buffer pipeline, and the throttling component is used to limit the flow of the fluid flowing through the buffer pipeline;

[0012] A control valve assembly is provided in the one-way pipeline, and the control valve assembly is used to control the flow direction of the fluid in the one-way pipeline so that the fluid can only flow toward the buffer cavity.

[0013] In some embodiments, a limiting device is provided at the end of the extension portion, and the limiting device is used to limit the range of movement of the buffer piston toward the working piston.

[0014] In some embodiments, the limiting device is a bolt connected to the end of the extension part. The size of the bolt end is larger than the size of the extension part and a limiting protrusion is formed at the end of the extension part. A connecting hole connected to the return oil pipeline is provided on the bolt.

[0015] In some embodiments, an end of the buffer piston close to the working piston is configured as a hollow structure capable of accommodating the extension portion, and a communicating gap is provided at an end of the buffer piston abutting against the working piston.

[0016] In some embodiments, a limiting portion is provided on one end of the buffer piston close to the retracting end cover, and the limiting portion is used to limit the range of movement of the buffer piston toward the retracting end cover.

[0017] In some embodiments, the throttling assembly includes a buffer gasket, and a throttling hole is provided on the buffer gasket.

[0018] In some embodiments, the throttle assembly further includes an oil filter ring.

[0019] In some embodiments, there are two oil filter rings, namely a first oil filter ring and a second oil filter ring, and the first oil filter ring and the second oil filter ring are respectively located on both sides of the buffer gasket.

[0020] In some embodiments, the throttling assembly further includes a limiting cylinder, which is used to compress the oil filter ring.

[0021] In some embodiments, the control valve assembly includes a conical plug, a one-way valve head and a second spring arranged in sequence from the inlet to the outlet of the one-way pipeline. The conical plug is fixed in the one-way pipeline, and the second spring is used to tighten the one-way valve head to the end of the flow hole of the conical plug.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] 1. The retraction chamber is divided into an independent buffer chamber and an oil return chamber by a buffer piston. The oil return chamber performs the function of the original retraction chamber. When the working piston moves toward the retraction end to the locked position, the self-locking structure of the hydraulic device can complete the self-locking function; the separated buffer chamber also performs its own buffering function. In this way, the use of the buffer assembly of the utility model can achieve in-position buffering without interfering with the original hydraulic device's in-position self-locking function.

[0024] 2. The entire buffer assembly is integrated together and can be directly installed on the original self-locking hydraulic device for use without modifying the original self-locking hydraulic device, which has strong applicability.

[0025] 3. The working oil pressure of the buffer chamber can be reduced by increasing the contact area between the buffer piston and the working piston (i.e., the effective working area of the buffer chamber), thereby reducing the pressure on the buffer structure and increasing the service life of the buffer structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the overall structure of the self-locking hydraulic device with the upper buffer assembly installed in the embodiment of the present application.

[0028] Figure 2 This is a cross-sectional view of a self-locking hydraulic device with an upper buffer assembly installed in an embodiment of the present application.

[0029] Figure 3 This is a cross-sectional view of the retracted end cover in an embodiment of the present application.

[0030] Figure 4 This is a cross-sectional view of the working piston and locking mechanism of the self-locking hydraulic device in the embodiment of the present application.

[0031] Figure 5 This is a general schematic diagram of the hydraulic oil flow during the retraction phase of the working piston in an embodiment of the present application.

[0032] Figure 6 This is a partial schematic diagram of the hydraulic oil flow during the retraction phase of the working piston in an embodiment of the present application.

[0033] Figure 7 This is a general schematic diagram of the hydraulic oil flow during the working piston extension stage of an embodiment of the present application.

[0034] Figure 8 This is a partial schematic diagram of the hydraulic oil flow during the working piston extension stage of an embodiment of the present application.

[0035] in:

[0036] 1-retract end nozzle, 2-extending end nozzle, 3-extending end cover, 4-outer cylinder, 5-working piston, 6-second limiting device, 7-buffer piston, 8-retracting end cover, 9-first spring, 10-extending end pipeline, 11-return oil pipeline, 121-buffer pipeline, 122-one-way pipeline, 13-extending chamber, 14-return oil chamber, 15-buffer chamber, 501-second limiting cylinder, 502-third spring, 503-working piston rod, 504-core shaft, 505-sleeve, 506-circuit ring, 507-slider, 801-second plug, 802-pressure head, 803-conical plug, 804-one-way valve head, 805-second spring, 806-retractable end cover part, 807-first oil filter ring, 808-first limiting cylinder, 809-buffer gasket, 810-second oil filter ring, 811-first plug. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0038] This embodiment is a buffer assembly for a self-locking hydraulic device.

[0039] Figure 1 and Figure 2 1 and 2 are a schematic diagram and a cross-sectional view of the overall structure of a self-locking hydraulic device equipped with a buffer assembly according to this embodiment.

[0040] The self-locking hydraulic device includes an outer cylinder 4, a working piston 5 arranged in the outer cylinder 4, and a locking mechanism.

[0041] The buffer assembly of this embodiment includes a retractable end cover 8 provided at one end of the outer cylinder 4, and a closed retractable chamber is formed in the outer cylinder 4 between the retractable end cover 8 and the working piston 5;

[0042] A buffer piston 7 is provided in the retraction chamber and divides the retraction chamber into an independent buffer chamber 15 and an oil return chamber 14. A first spring 9 is provided between the buffer piston 7 and the retraction end cover 8.

[0043] The retracting end cover 8 is provided with an extension portion extending into the oil return chamber 14, and the buffer piston 7 is fitted and sleeved on the extension portion;

[0044] An oil return line 11 is provided on the retracted end cover 8, and an outlet end of the oil return line 11 is provided at the end of the extension portion, so that the oil return line 11 is connected to the oil return chamber 14;

[0045] The retractable end cover 8 is provided with a buffer pipeline 121 and a one-way pipeline 122 which are respectively connected to the buffer cavity 15;

[0046] The buffer line 121, the one-way line 122 and the oil return line 11 are connected at one end of their inlet;

[0047] A throttling assembly is provided in the buffer line 121 , and the throttling assembly is used to limit the flow of the fluid flowing through the buffer line 121 ;

[0048] A control valve assembly is provided in the one-way pipeline 122 , and the control valve assembly is used to control the flow direction of the fluid in the one-way pipeline 122 so that the fluid can only flow toward the buffer chamber 15 .

[0049] In this embodiment, a limiting device 6 is provided at the end of the extension portion, and the limiting device 6 is used to limit the range of movement of the buffer piston 7 toward the working piston 5 .

[0050] In this embodiment, the limiting device 6 is a bolt connected to the end of the extension part. The size of the bolt end is larger than the size of the extension part and a limiting protrusion is formed at the end of the extension part. A connecting hole connected to the return oil pipeline 11 is provided on the bolt.

[0051] In this embodiment, the end of the buffer piston 7 close to the working piston 5 is configured as a hollow structure capable of accommodating the extension portion, and a communicating notch is provided at the end of the buffer piston 7 abutting against the working piston 5 .

[0052] In this embodiment, a limiting portion is provided on one end of the buffer piston 7 close to the retracting end cover 8 , and the limiting portion is used to limit the movement range of the buffer piston 7 toward the retracting end cover 8 .

[0053] In this embodiment, the throttling component is a buffer gasket 809, and a throttling hole is provided on the buffer gasket 809, through which the throttling effect is achieved.

[0054] In order to prevent the throttle hole from being blocked, the throttle assembly of this embodiment further includes two oil filter rings, namely a first oil filter ring 807 and a second oil filter ring 810 , which are respectively arranged on both sides of the buffer gasket 809 .

[0055] At the same time, the throttling assembly also includes a limiting cylinder for pressing the oil filter ring.

[0056] In this embodiment, the control valve assembly specifically includes a conical plug 803, a one-way valve head 804 and a second spring 805 arranged in sequence from the inlet to the outlet of the one-way pipeline 122. The conical plug 803 is fixedly arranged in the one-way pipeline 122, and the second spring 805 is used to tighten the one-way valve head 804 to the end of the flow hole of the conical plug 803.

[0057] The operation of the hydraulic device can be divided into two stages, namely the extension stage and the retraction stage.

[0058] The following describes the movement and principles of the various components of the hydraulic device in two stages.

[0059] Retraction phase:

[0060] like Figure 5 、 Figure 6 shown.

[0061] Oil flows from the extension end nozzle 2 through the extension end pipeline 10 into the extension chamber 13. The hydraulic oil in the extension chamber 13 pushes the working piston 5 toward the retraction end. At this time, the hydraulic oil in the return oil chamber 14 flows out through the return oil pipeline 11, making the hydraulic pressure in the buffer chamber 15 greater than the hydraulic pressure in the return oil chamber 14, pushing the one-way valve head 804 toward the tapered plug 803, blocking the one-way pipeline 122. At this time, the hydraulic oil in the buffer chamber 15 can only be discharged through the small hole in the buffer pipeline 121. At this time, the hydraulic oil in the buffer chamber 15 can only flow out through the buffer pipeline 121. Since the buffer pipeline 121 has a throttling effect, the pressure in the buffer chamber 15 decreases slowly instead of quickly, achieving a buffering effect. During the buffering process, the buffer piston 7 slowly moves toward the retraction end and compresses the first spring 9.

[0062] When the working piston 5 moves to the self-locking position, the liquid pressure in the oil return chamber 14 is less than the rebound force of the third spring 502. The rebound force of the third spring 502 drives the retaining ring 506 to move toward the retracted end, pushing the slider 507 to slide out and lock with the outer cylinder 4.

[0063] Extension phase:

[0064] like Figure 7 、 Figure 8 shown.

[0065] Oil enters the retracting nozzle 1. Under the pressure of the inlet oil, the check valve head 804 of the one-way line 122 moves away from the tapered plug 803, separating them and opening the one-way line 122. Hydraulic oil flows through the one-way line 122 and the buffer line 121 into the buffer chamber 15, and then through the return oil line 11 into the return oil chamber 14. At this point, the hydraulic pressures in the buffer chamber 15 and the return oil chamber 14 are equal. When the pressure in the return oil chamber 14 increases to a level greater than the self-locking force of the slider 507, the retaining ring 506 moves toward the extended end, releasing the retaining ring 506's force on the slider 507. Simultaneously, the hydraulic pressure in the return oil chamber pushes the slider 507 back into the sleeve 505, unlocking the locking mechanism and allowing the working piston 5 to move toward the extended end. Simultaneously, because the hydraulic pressures in the buffer chamber 15 and the return oil chamber 14 are equal, the buffer piston 7, under the rebound force of the first spring 9, moves toward the extended end, stopping at the stopper 6.

[0066] The basic parameters of the device can be set as shown in the following table:

[0067] Table 1 Basic parameters of the hydraulic device of Example 1

[0068]

[0069] During the retraction phase, the working piston 5 is subjected to a hydraulic pressure of F, and the buffer pressure of the buffer chamber is P3.

[0070] F=P1*π*(D 2 -d 2 ) / 4-P2*π*D 2 / 4

[0071] =21*3.14*(32 2 -18 2 ) / 4-2*3.14*32 2 / 4

[0072] =11539.5-1607.68

[0073] =9931.82N

[0074] P3=F / (π*(D1 2 -d1 2 ) / 4)

[0075] =9931.82 / (3.14*(37 2 -14 2 ) / 4)

[0076] =10.795MPa

[0077] It can be seen from this that the locking mechanism of the present invention can be locked by overcoming only the return oil pressure of 2 MPa, without having to overcome the buffer pressure of up to 10.795 MPa.

[0078] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention falls within the scope of protection of the present invention.

Claims

1. A buffer assembly for a self-locking hydraulic device, the self-locking hydraulic device comprising an outer cylinder (4) and a working piston (5) arranged in the outer cylinder (4), characterized in that: The buffer assembly includes a retractable end cover (8) disposed at one end of the outer cylinder (4), and a closed retractable cavity is formed in the outer cylinder (4) between the retractable end cover (8) and the working piston (5); A buffer piston (7) is provided in the retraction chamber, dividing the retraction chamber into an independent buffer chamber (15) and an oil return chamber (14); a first spring (9) is provided between the buffer piston (7) and the retraction end cover (8); The retractable end cover (8) is provided with an extension portion extending into the oil return chamber (14), and the buffer piston (7) is fitted and sleeved on the extension portion; An oil return pipeline (11) is provided on the retractable end cover (8), and an outlet end of the oil return pipeline (11) is provided at the end of the extension portion, so that the oil return pipeline (11) is communicated with the oil return chamber (14); The retractable end cover (8) is provided with a buffer pipeline (121) and a one-way pipeline (122) respectively communicating with the buffer cavity (15); The buffer pipeline (121), the one-way pipeline (122) and the oil return pipeline (11) are connected at one end of their inlet; A throttling component is provided in the buffer pipeline (121), and the throttling component is used to limit the flow of the fluid flowing through the buffer pipeline (121); A control valve assembly is provided in the one-way pipeline (122), and the control valve assembly is used to control the flow direction of the fluid in the one-way pipeline (122), so that the fluid can only flow toward the buffer chamber (15).

2. The buffer assembly for a self-locking hydraulic device according to claim 1, characterized in that: A limiting device is provided at the end of the extension portion, and the limiting device is used to limit the range of movement of the buffer piston (7) toward the working piston (5).

3. The buffer assembly for a self-locking hydraulic device according to claim 2, characterized in that: The limiting device is a bolt connected to the end of the extension part. The size of the bolt end is larger than the size of the extension part and a limiting protrusion is formed at the end of the extension part. The bolt is provided with a connecting hole connected to the oil return pipeline (11).

4. The buffer assembly for a self-locking hydraulic device according to claim 3, characterized in that: The end of the buffer piston (7) close to the working piston (5) is provided with a hollow structure capable of accommodating the extension portion, and the end of the buffer piston (7) abutting against the working piston (5) is provided with a communicating notch.

5. The buffer assembly for a self-locking hydraulic device according to claim 1, characterized in that: A limiting portion is provided on one end of the buffer piston (7) close to the retracting end cover (8), and the limiting portion is used to limit the range of movement of the buffer piston (7) toward the retracting end cover (8).

6. The buffer assembly for a self-locking hydraulic device according to claim 1, characterized in that: The throttling assembly comprises a buffer gasket (809), and a throttling hole is provided on the buffer gasket (809).

7. The buffer assembly for a self-locking hydraulic device according to claim 6, characterized in that: The throttle assembly further includes an oil filter ring.

8. The buffer assembly for a self-locking hydraulic device according to claim 7, characterized in that: There are two oil filter rings, namely a first oil filter ring and a second oil filter ring (810). The first oil filter ring and the second oil filter ring (810) are respectively located on both sides of the buffer gasket (809).

9. The buffer assembly for a self-locking hydraulic device according to claim 7, characterized in that: The throttling assembly further includes a limiting cylinder, which is used to compress the oil filter ring.

10. The buffer assembly for a self-locking hydraulic device according to claim 1, characterized in that: The control valve assembly includes a conical plug (803), a one-way valve head (804) and a second spring (805) which are arranged in sequence from the inlet to the outlet of the one-way pipeline (122). The conical plug (803) is fixedly arranged in the one-way pipeline (122), and the second spring (805) is used to press the one-way valve head (804) against the end of the flow hole of the conical plug (803).

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