Oil return device of vertical oil jack

Abstract

The invention discloses an oil return device of a vertical oil jack, which is arranged on a jack base and comprises a large oil passage, a large oil return pipe, a large oil return pipe, a large oil return pipe, a large oil return pipe and a large oil return pipe, the small oil duct is communicated with the large oil duct; the small oil duct is communicated with an oil storage cavity on the jack base through an oil return hole; the plugging structure is arranged in the large oil duct and used for plugging the oil inlet of the small oil duct from one side of the large oil duct; and the adjusting piece is movably arranged on the jack base and used for pushing the plugging structure so that the oil inlet of the small oil duct can be opened. The plugging structure plugs the oil inlet of the small oil duct from one side of the large oil duct, oil pressure in the oil cavity of the telescopic rod can be applied to the plugging structure, the plugging structure can plug the oil inlet of the small oil duct more tightly under the condition that the oil pressure is larger, and the situation that a hydraulic rod descends in the working process of the jack is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of vertical hydraulic jacks, in particular to an oil return device of a vertical hydraulic jack. Background Art

[0002] The existing vertical hydraulic jack oil return structure is as follows Figure 1 As shown, the oil return valve stem 14 is usually used to press the steel ball 15 against the oil return hole. When the hydraulic rod of the vertical hydraulic jack needs to be lowered, the oil return valve stem 14 is rotated outward to make the steel ball 15 leave the oil return hole, and the hydraulic oil in the telescopic rod oil chamber flows back to the oil storage chamber through the oil return channel, so that the hydraulic rod of the vertical hydraulic jack can be lowered. However, this oil return structure uses the steel ball 15 to block the oil return hole from the outside. When the oil pressure in the telescopic rod oil chamber is very high (that is, when the load is very heavy), the oil pressure easily pushes the steel ball from the inside, causing the steel ball and the oil return hole to become loose, and the hydraulic oil in the telescopic rod oil chamber leaks, resulting in the hydraulic rod of the vertical hydraulic jack often automatically descending during operation, which brings great safety hazards. In order to prevent the above problems from occurring, operators usually use the hand lever, pliers, wrench or hammer provided on the vertical hydraulic jack to tighten the oil return valve stem 14. However, the inventors have found through long-term testing that even with the assistance of the above tools, the oil drain valve cannot be locked in many cases. Instead, the steel ball, the oil return valve stem or the steel ball seat hole may be deformed and cracked because the locking force cannot be controlled, and the hydraulic oil cannot be properly sealed, resulting in pressure relief, which greatly reduces the service life and safety performance of the vertical hydraulic jack. Summary of the invention

[0003] In order to solve the above problems, the present application provides an oil return device for a vertical hydraulic jack, which can better seal the oil return hole when the oil pressure in the oil chamber of the telescopic rod is higher, thereby preventing the hydraulic rod of the vertical hydraulic jack from falling during operation.

[0004] The purpose of the present invention is achieved through the following technical solution: an oil return device for a vertical hydraulic jack, arranged on a jack base, comprising:

[0005] A large oil channel, which is connected with the telescopic rod oil chamber on the jack base through the large oil channel oil inlet hole;

[0006] A small oil passage, which is connected to the large oil passage; and the small oil passage is connected to the oil storage chamber on the jack base through an oil return hole;

[0007] A plugging structure, disposed in the large oil passage, for plugging the oil inlet of the small oil passage from one side of the large oil passage;

[0008] The adjusting member is movably arranged on the jack base and is used to push the blocking structure to open the oil inlet of the small oil channel.

[0009] The blocking structure of the present invention blocks the oil inlet of the small oil channel from one side of the large oil channel. The oil pressure in the oil chamber of the telescopic rod can be applied to the blocking structure, so that the blocking structure can block the oil inlet of the small oil channel more tightly when the oil pressure is greater, thereby preventing the hydraulic rod of the jack from falling during operation.

[0010] Furthermore, the blocking structure includes an elastic member and a blocking member connected to the elastic member; the elastic member can push the blocking member so that the blocking member blocks the oil inlet of the small oil channel.

[0011] The blocking member is a steel ball or a conical valve core.

[0012] The adjusting member comprises an adjusting block movably arranged on the jack base and a ejector pin arranged on the adjusting block; the ejector pin is inserted into the small oil channel and forms a gap with the inner wall of the small oil channel; when the adjusting block moves, the ejector pin can push the blocking structure forward to open the oil inlet of the small oil channel.

[0013] A sealing ring is arranged between the adjusting block and the jack base, which can prevent the hydraulic oil from leaking from the gap between the adjusting block and the jack base.

[0014] The outer wall of the adjusting block is provided with an annular limiting groove, and the jack base is provided with a limiting piece inserted into the annular limiting groove. The cooperation between the annular limiting groove and the limiting piece can prevent the adjusting block from being separated from the jack base.

[0015] The adjusting block is provided with a handle to facilitate turning the adjusting block.

[0016] The adjusting block is threadedly connected to the jack base.

[0017] The jack base is provided with an installation opening communicated with the large oil channel, a locking piece is installed in the installation opening, and the blocking structure is connected to the locking piece.

[0018] Compared with the prior art, this application has the following beneficial effects:

[0019] (1) The sealing structure of the present invention seals the oil inlet of the small oil channel from one side of the large oil channel. The oil pressure in the oil chamber of the telescopic rod can be applied to the sealing structure, so that the sealing structure can seal the oil inlet of the small oil channel more tightly when the oil pressure is greater, thereby preventing the hydraulic rod from falling during the operation of the jack.

[0020] (2) The present invention can limit the adjustment block by cooperating with the annular limit groove and the limit member to prevent the adjustment block from being separated from the jack base.

[0021] Some additional features of the present application may be explained in the following description. Some additional features of the present application will be apparent to those skilled in the art by inspection of the following description and corresponding drawings or understanding of the production or operation of the embodiments. The features disclosed in the present application may be realized and achieved by practice or use of various methods, means and combinations of the specific embodiments described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The exemplary embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation of the present application. In each figure, the same reference numeral represents the same component.

[0023] Figure 1 It is a schematic diagram of the existing jack oil return structure.

[0024] Figure 2 It is a top view of the present invention.

[0025] Figure 3 for Figure 2 Cross-sectional view at AA in the middle.

[0026] Figure 4 It is a schematic diagram of the adjusting member of the present invention.

[0027] The figure markings in the above drawings are: 1-jack base, 2-oil storage chamber, 3-telescopic rod oil chamber, 4-large oil channel oil inlet hole, 5-oil return hole, 6-elastic member, 7-blocking member, 8-locking member, 9-adjusting member, 91-thimble, 92-adjusting block, 93-sealing ring, 94-annular limit groove, 95-handle, 10-installation chamber, 11-small oil channel, 12-large oil channel, 13-limiting member, 14-oil return valve stem, 15-steel ball, 16-installation port. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0029] Example 1

[0030] like Figure 2 , 3As shown, this embodiment discloses an oil return device of a vertical hydraulic jack, which is arranged on a jack base 1. Specifically, the oil return device of the vertical hydraulic jack includes: a large oil channel 12, a small oil channel 11, a blocking structure and an adjusting member 9. Among them, the large oil channel 12 is opened in the jack base 1, and is connected with the telescopic rod oil chamber 3 on the jack base 1 through the large oil channel oil inlet hole 4, and the hydraulic oil in the telescopic rod oil chamber 3 can flow into the large oil channel 12 through the large oil channel oil inlet hole 4. The small oil channel 11 is also opened in the jack base 1, and is connected with the large oil channel 12; in addition, the small oil channel 11 is connected with the oil storage chamber 2 on the jack base 1 through the oil return hole 5. Through the above structure, the large oil channel oil inlet hole 4, the large oil channel 12, the small oil channel 11 and the oil return hole 5 together form an oil return channel, and the hydraulic oil in the telescopic rod oil chamber 3 can flow back to the oil storage chamber 2 through the large oil channel oil inlet hole 4, the large oil channel 12, the small oil channel 11 and the oil return hole 5 in sequence.

[0031] In addition, a blocking structure is arranged in the large oil channel 12, which is used to block the oil inlet of the small oil channel 11 from one side of the large oil channel 12. Specifically, the diameter of the large oil channel 12 is larger than the diameter of the small oil channel 11, and the blocking structure can block the oil inlet of the small oil channel 11, thereby closing the small oil channel 11, so that the hydraulic oil in the large oil channel 12 cannot enter the small oil channel 11. The adjusting member 9 is movably arranged on the jack base 1. When the adjusting member 9 moves forward, it can push the blocking structure to disengage the blocking structure from the oil inlet of the small oil channel 11, and the hydraulic oil in the large oil channel 12 can enter the small oil channel 11 and flow back from the oil return hole 5 to the oil storage chamber 2. When the adjusting member 9 moves backward, the blocking structure blocks the oil inlet of the small oil channel 11 again, and the oil return channel is blocked.

[0032] Specifically, Figure 3 As shown, the blocking structure includes an elastic member 6 and a blocking member 7, and the blocking member 7 is connected to the elastic member 6. The elastic member 6 is used to give the blocking member 7 a forward thrust so that the blocking member 7 can block the oil inlet of the small oil passage 11. When the blocking member 7 is squeezed by the adjusting member 9, the elastic member 6 is compressed, and the blocking member 7 is separated from the oil inlet of the small oil passage 11.

[0033] In the specific configuration, the elastic member 6 in this embodiment can be implemented by a spring, and of course, the elastic member 6 can also be implemented by other elastic devices, such as springs, elastic retaining rings, etc. Correspondingly, the blocking member 7 is a steel ball or a conical valve core, and this embodiment adopts a conical valve core.

[0034] In addition, the jack base 1 is provided with an installation opening 16, which is connected to the large oil passage 12 and extends to the outer wall of the jack base 1. A locking member 8 is installed in the installation opening 16, and the locking member 8 is connected to the elastic member 6, which is used to compress the elastic member 6 so that the elastic member 6 can apply a forward thrust to the blocking member 7. The locking member 8 and the installation opening 16 are threadedly connected. After the locking member 8 is unscrewed, the elastic member 6 and the blocking member 7 can be installed into the large oil passage 12 from the installation opening 16. In specific implementation, the locking member 8 can be implemented by a locking bolt, and a sealing ring can be provided on the locking bolt to seal the gap between the locking bolt and the installation opening 16 to prevent the hydraulic oil in the large oil passage 12 from leaking out from the installation opening 16.

[0035] In addition, the adjusting member 9 is used to push open the blocking member 7 so that the oil return channel forms a passage. Figure 4 As shown, the adjusting member 9 includes an adjusting block 92 and a ejector pin 91 disposed on the adjusting block 92. A mounting cavity 10 is disposed on the jack base 1, and the adjusting block 92 is mounted in the mounting cavity 10 by means of a threaded connection. When the adjusting block 92 is turned, the adjusting block 92 can move forward and backward. After the adjusting block 92 is installed in the mounting cavity 10, the ejector pin 91 is inserted in the small oil passage 11. When the adjusting block 92 is turned forward, the ejector pin 91 pushes the plugging member 7 forward, thereby opening the oil inlet of the small oil passage 11. When the adjusting block 92 is turned backward, the ejector pin is separated from the plugging member 7, and the plugging member 7 re-closes the oil inlet of the small oil passage 11 under the thrust of the elastic member 6.

[0036] A gap is formed between the ejector pin 91 and the inner wall of the small oil passage 11. When the ejector pin 91 pushes open the plugging member 7, the hydraulic oil in the large oil passage 12 can enter the oil return hole 5 from the gap between the ejector pin 91 and the inner wall of the small oil passage 11, and finally flow back into the oil storage chamber 2. Since the gap between the ejector pin 91 and the inner wall of the small oil passage 11 is small, the speed at which the hydraulic oil flows back into the oil storage chamber 2 is slow, so the contraction speed of the telescopic rod of the jack can be slowed down, thereby improving the safety of the use of the jack.

[0037] In order to improve the sealing performance between the adjusting block 92 and the installation cavity 10, a sealing ring 93 is provided between the adjusting block 92 and the jack base 1. When provided, the sealing ring 93 can be installed on the adjusting block 92, and the sealing ring can prevent the hydraulic oil from leaking from the gap between the adjusting block 92 and the jack base 1.

[0038] The adjusting block 92 is provided with a handle 95 for turning the adjusting block 92 .

[0039] When the jack is in operation, the plugging member 7 blocks the oil inlet of the small oil passage 11. When the hydraulic oil is continuously pumped into the telescopic rod oil chamber 3, the telescopic rod of the jack extends under the action of the oil pressure. When the telescopic rod of the jack needs to be retracted, the adjustment block 92 is turned forward, the ejector pin 91 pushes the plugging member 7 open, the reflux oil passage is opened, and the hydraulic oil in the telescopic rod oil chamber 3 flows back to the oil storage chamber 2. After the oil pressure in the telescopic rod oil chamber 3 disappears, the telescopic rod of the jack is retracted.

[0040] In this embodiment, the plugging member 7 blocks the oil inlet of the small oil passage 11 from the side of the large oil passage 12, and the oil pressure in the telescopic rod oil chamber 3 can be applied to the plugging member 7 after passing through the large oil passage oil inlet hole 4 and the large oil passage 12. Therefore, the plugging member 7 can be more tightly sealed on the oil inlet of the small oil passage 11 when the oil pressure is greater, preventing the hydraulic oil in the telescopic rod oil chamber 3 from leaking and the oil pressure from decreasing, thereby causing the hydraulic rod of the jack to drop during operation. Compared with the traditional operation method of tightening the oil return valve stem 14, the jack base 1 and the plugging member 7 can be effectively protected.

[0041] Example 2

[0042] like Figure 3 , 4 As shown, on the basis of Example 1, this embodiment is provided with an annular limiting groove 94 on the outer wall of the adjustment block 92. Correspondingly, a limiting member 13 is provided on the jack base 1. The limiting member 13 can be implemented by a screw, which can be installed on the bottom or side wall of the jack base 1. When the screw is screwed into the mounting cavity 10, the front end of the screw can be inserted into the annular limiting groove 94. The width of the annular limiting groove 94 needs to match the distance that the adjustment block 92 moves forward and backward, that is, when the adjustment block 92 moves forward and backward, the limiting member 13 can move relative to the annular limiting groove 94. When the adjustment block 92 moves backward to the extreme position, the groove wall of the annular limiting groove 94 abuts against the limiting member 13 to prevent the adjustment block 92 from being separated from the jack base 1.

[0043] It should be noted that all features disclosed in this specification, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any manner.

[0044] In addition, the above specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the present invention, and these solutions also belong to the disclosure scope of the present invention and fall within the protection scope of the present invention. Those skilled in the art should understand that the present invention description and its drawings are illustrative and do not constitute a limitation of the claims. The protection scope of the present invention is defined by the claims and their equivalents.

Claims

1. An oil return device for a vertical hydraulic jack, arranged on a jack base (1), characterized in that: include: A large oil channel (12) which is connected to the telescopic rod oil chamber (3) on the jack base (1) through the large oil channel oil inlet hole (4); A small oil passage (11) is connected to the large oil passage (12); and the small oil passage (11) is connected to the oil storage chamber (2) on the jack base (1) through an oil return hole (5); A blocking structure, arranged in the large oil passage (12), used for blocking the oil inlet of the small oil passage (11) from one side of the large oil passage (12); The adjusting member (9) is movably arranged on the jack base (1) and is used to push the blocking structure so as to open the oil inlet of the small oil channel (11).

2. The oil return device of the vertical hydraulic jack according to claim 1, characterized in that: The blocking structure comprises an elastic member (6) and a blocking member (7) connected to the elastic member (6); the elastic member (6) can push the blocking member (7) so that the blocking member (7) blocks the oil inlet of the small oil passage (11).

3. The oil return device of the vertical hydraulic jack according to claim 2, characterized in that: The blocking member (7) is a steel ball or a conical valve core.

4. The oil return device of the vertical hydraulic jack according to claim 1, characterized in that: The adjusting member (9) comprises an adjusting block (92) movably arranged on the jack base (1) and a ejector pin (91) arranged on the adjusting block (92); the ejector pin (91) is inserted into the small oil channel (11) and forms a gap with the inner wall of the small oil channel (11); when the adjusting block (92) moves, the ejector pin (91) can push the blocking structure forward to open the oil inlet of the small oil channel (11).

5. The oil return device of the vertical hydraulic jack according to claim 4, characterized in that: A sealing ring (93) is provided between the adjustment block (92) and the jack base (1).

6. The oil return device of the vertical hydraulic jack according to claim 4, characterized in that: The outer wall of the adjustment block (92) is provided with an annular limiting groove (94), and the jack base (1) is provided with a limiting member (13) inserted into the annular limiting groove (94).

7. The oil return device of the vertical hydraulic jack according to claim 4, characterized in that: The adjustment block (92) is provided with a handle (95).

8. The oil return device of the vertical hydraulic jack according to claim 4, characterized in that: The adjustment block (92) is threadedly connected to the jack base (1).

9. The oil return device of the vertical hydraulic jack according to claim 1, characterized in that: The jack base (1) is provided with a mounting opening (16) which is in communication with the large oil passage (12); a locking piece (8) is installed in the mounting opening (16); and the blocking structure is connected to the locking piece (8).

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