Double-acting bolt hydraulic tensioner

Abstract

The utility model relates to the technical field of hydraulic tensioners, and discloses a double-acting bolt hydraulic tensioner which comprises a shell, a third sliding groove is formed in the shell, a shell cover is fixed to the top of the inner wall of the third sliding groove, a piston is connected to the inner side of the third sliding groove in a sliding mode, and a sleeve used for being connected with a bolt is inserted into the inner side of the piston. A connecting hole is formed in the top of the sleeve. A prompt assembly is arranged on one side of the sleeve. Through the visual phenomenon that the second sliding column is flush with the top of the sleeve, a worker can immediately confirm that the bolt and the sleeve are correctly and completely connected together, errors caused by the fact that the bolt is not completely screwed or too tightly screwed are greatly reduced through a visual feedback mechanism, reworking work needing to be conducted due to poor connection is reduced, and the working efficiency is improved. Working quality and safety are further improved, the connection state can be confirmed in time, workers do not need to repeatedly check or adjust the screwing degree of the bolt, and therefore time is saved, and working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic tensioners, in particular to a double-acting bolt hydraulic tensioner. Background Art

[0002] Bolt tensioner is the abbreviation of bolt hydraulic tensioner. Hydraulic tensioner uses the hydraulic source provided by the hydraulic booster pump to determine the tensile force according to the tensile strength, yield coefficient and elongation of the material. The tensile force generated by the ultra-high pressure oil pump is used to stretch the bolt to which the force is applied in its elastic deformation zone, causing the bolt diameter to deform slightly, thereby making the nut easier to loosen. In addition, it can also be used as a device for applying axial force to the hydraulic interference connection for top pressure installation.

[0003] In the fields of heavy machinery, bridge construction, large equipment manufacturing, etc., the tightness and reliability of bolt connections are crucial to the safety and stability of the overall structure. Traditional bolt tightening methods such as manual or mechanical wrenches often rely on the operator's experience and feel, which can easily lead to the bolts not being fully tightened or being over-tightened. Therefore, a double-acting hydraulic bolt tensioner is proposed. Utility Model Content

[0004] The purpose of the utility model is to provide a double-acting hydraulic bolt tensioner to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a double-acting hydraulic bolt tensioner, comprising a housing, a third chute provided inside the housing, a housing cover fixed to the top of the inner wall of the third chute, a piston slidably connected to the inner side of the third chute, and a sleeve for connecting with a bolt inserted into the inner side of the piston;

[0006] A connecting hole is provided on the top of the sleeve, and a prompt component is provided on one side of the sleeve;

[0007] A first joint and a second joint for the piston to move in two directions, up and down, are respectively installed on one side of the housing;

[0008] The prompt component includes a slide plate, a first slide column and a second slide column are fixed on both sides of the slide plate, a spring is sleeved on the outer side of the second slide column, a second slide groove is opened inside the sleeve, and a first slide groove is provided inside the second slide groove.

[0009] Preferably, the first connector and the second connector are both connected to the third slide slot, and a hand strap is fixed to the outside of the shell.

[0010] Preferably, the outer side of the slide is slidably connected to the inner side of the second slide groove, the outer side of the second slide column is slidably connected to the inner side of the first slide groove, and both ends of the spring are respectively connected to one side of the slide and the second slide groove.

[0011] Preferably, a second limiting groove is provided on the inner side wall of the third sliding groove, and a first sealing ring seamlessly slidably connected to the outer side of the piston is connected to the inner side of the second limiting groove.

[0012] Preferably, a first limiting groove is provided on the outer side of the piston, and a second sealing ring is connected to the inner side of the first limiting groove and is seamlessly slidably connected to the inner side wall of the third sliding groove.

[0013] Preferably, the bottom of the shell cover is connected to a third sealing ring and a fourth sealing ring, respectively. The outer side of the third sealing ring is connected between the shell and the shell cover, respectively. The outer side of the fourth sealing ring is seamlessly slidably connected to the outer side of the piston.

[0014] Preferably, when the first joint delivers hydraulic oil to the inner side of the third chute, the piston pushes the sleeve to move upward, and when the second joint delivers hydraulic oil to the inner side of the third chute, the piston drives the sleeve to move downward.

[0015] Compared with the prior art, the above technical solution adopted by the present invention has the following technical effects:

[0016] 1. The visual indication that the second slide post is flush with the top of the sleeve allows workers to immediately confirm that the bolt and sleeve are correctly and completely connected. This visual feedback mechanism significantly reduces errors caused by incomplete or overtightened bolts, reduces the need for rework due to poor connections, and further improves work quality and safety. The connection status can be instantly confirmed, eliminating the need for workers to repeatedly check or adjust the tightening of the bolts, thus saving time and improving work efficiency.

[0017] Second, the hydraulic tensioner applies tension to the bolt by precisely controlling the pressure of the hydraulic oil, ensuring that the bolt is subjected to a uniform and controllable preload during the tightening process. When the hydraulic tensioner applies tension to the bolt, relative rotation between the bolt and nut does not occur, thus avoiding damage caused by friction and wear. The hydraulic tensioner can quickly and accurately complete the tensioning and tightening of the bolt, greatly shortening the working time. At the same time, due to its easy operation, it reduces the labor intensity of workers and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1This is a schematic structural diagram of the utility model from a first perspective;

[0020] Figure 2 This is a schematic diagram of the structure of the utility model from a second perspective;

[0021] Figure 3 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0022] Figure 4 This is a schematic diagram of the three-dimensional structure of the sleeve of the present utility model;

[0023] Figure 5 This is a schematic diagram of the main cross-sectional structure of the sleeve of the present utility model;

[0024] Figure 6 This is a structural diagram of the slide plate of the present utility model.

[0025] Explanation of the accompanying drawings: 1. Shell; 2. Hand strap; 3. Prompt assembly; 31. First slide groove; 32. First slide column; 33. Slide plate; 34. Second slide groove; 35. Spring; 36. Second slide column; 4. Shell cover; 5. Connecting hole; 6. Sleeve; 7. First joint; 8. Second joint; 9. First limiting groove; 10. First sealing ring; 11. Second limiting groove; 12. Second sealing ring; 13. Piston; 14. Third sealing ring; 15. Fourth sealing ring; 16. Third slide groove. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0028] Example

[0029] See also Figure 1-6The utility model provides a technical solution: a double-acting bolt hydraulic tensioner, including a housing 1, a third slide groove 16 is provided inside the housing 1, a housing cover 4 is fixed to the top of the inner wall of the third slide groove 16, a piston 13 is slidably connected to the inside of the third slide groove 16, and a sleeve 6 for connecting with the bolt is inserted into the inside of the piston 13; a connecting hole 5 is opened on the top of the sleeve 6, and the housing 1, the housing cover 4, the sleeve 6, the first joint 7 and the second joint 8 and other parts constitute the hydraulic tensioner, and a prompt component 3 is provided on one side of the sleeve 6;

[0030] The prompt component 3 includes a slide plate 33, and a first slide post 32 and a second slide post 36 are fixed on both sides of the slide plate 33. A spring 35 is sleeved on the outside of the second slide post 36, and a second slide groove 34 is opened inside the sleeve 6. A sleeve 6 containing first slide posts 32 of different lengths can be prepared. When it is necessary to thread bolts of different lengths, it is only necessary to select sleeves 6 of first slide posts 32 of different lengths and insert the sleeve 6 into the inside of the piston 13. First slide posts 32 of different lengths can match bolts of different lengths. A first slide groove 31 is provided on the inside of the second slide groove 34. The outside of the slide plate 33 is slidably connected to the inside of the second slide groove 34, and the outside of the second slide post 36 is slidably connected to the inside of the first slide groove 31. The two ends of the spring 35 are respectively connected to one side of the slide plate 33 and the second slide groove 34.

[0031] A first joint 7 and a second joint 8 are respectively installed on one side of the housing 1 for the piston 13 to move in two directions, the first joint 7 and the second joint 8 are both connected to the third chute 16. A hand strap 2 is fixed to the outside of the housing 1. When the first joint 7 delivers hydraulic oil to the inside of the third chute 16, the piston 13 pushes the sleeve 6 to move upward. When the second joint 8 delivers hydraulic oil to the inside of the third chute 16, the piston 13 drives the sleeve 6 to move downward.

[0032] Connect the first joint 7 to the hydraulic booster pump, and the hydraulic oil enters the inner side of the third slide groove 16 through the first joint 7. Under the sealing of the first sealing ring 10 and the second sealing ring 12, the hydraulic oil pushes the piston 13 and the sleeve 6 to move upward. At this time, the sleeve 6 stretches the bolt upward and tightens the bolt on the outside of the bolt. It is only necessary to relieve the pressure of the first joint 7 and connect the second joint 8 to the hydraulic booster pump. At this time, the hydraulic oil enters the inner side of the third slide groove 16. At this time, under the sealing of the second sealing ring 12, the third sealing ring 14 and the fourth sealing ring 15, the piston 13 is pushed to move downward. At this time, the tension of the bolt is released, and a ratchet wrench is used to insert the connecting hole 5 to loosen the sleeve 6 connected to the bolt. Under the action of the first joint 7 and the second joint 8, the piston 13 can move in both directions.

[0033] A second limiting groove 11 is provided on the inner wall of the third slide groove 16, and a first sealing ring 10 seamlessly slidably connected to the outer side of the piston 13 is connected to the inner side of the second limiting groove 11. A first limiting groove 9 is provided on the outer side of the piston 13, and a second sealing ring 12 seamlessly slidably connected to the inner wall of the third slide groove 16 is connected to the inner side of the first limiting groove 9. A third sealing ring 14 and a fourth sealing ring 15 are respectively connected to the bottom of the shell cover 4. The outer side of the third sealing ring 14 is respectively connected between the shell 1 and the shell cover 4, and the outer side of the fourth sealing ring 15 is seamlessly slidably connected to the outer side of the piston 13.

[0034] Working principle: When the hydraulic tensioner is needed, first place the ring frame with an opening on the outside of the nut to be tightened, then connect the bottom of the housing 1 to the top of the ring frame. At this time, use the output end of the ratchet wrench to insert it into the inner side of the connecting hole 5. At this time, the bolt is inserted into the inner side of the housing 1 and is located at the bottom of the sleeve 6. At this time, the ratchet wrench drives the sleeve 6 to rotate. When the sleeve 6 rotates, it is threadedly connected with the bolt inserted inside.

[0035] When the sleeve 6 is threadedly connected to the bolt so that the top of the bolt contacts the first slide post 32, the first slide post 32 slides on the top of the bolt. When the top of the bolt is completely in contact with the top of the inner wall of the sleeve 6, the bolt pushes the first slide post 32, the slide plate 33 and the second slide post 36 to move upward. At the same time, the slide plate 33 compresses the spring 35. When the top of the second slide post 36 is flush with the top of the sleeve 6, the bolt and the sleeve 6 are connected together. The staff can know that the bolt and the sleeve 6 are threadedly connected together by visually observing that the second slide post 36 is flush with the top of the sleeve 6, so as to avoid the workers not being able to visually observe the connection status of the sleeve 6 and the bolt when using the ratchet wrench.

[0036] At this time, the first joint 7 is connected to the hydraulic booster pump. The hydraulic oil enters the inner side of the third chute 16 through the first joint 7. Under the sealing of the first sealing ring 10 and the second sealing ring 12, the hydraulic oil pushes the piston 13 and the sleeve 6 upward. At this time, the sleeve 6 pulls the bolt upward, and the bolt on the outside of the bolt can be tightened.

[0037] After the bolts are tightened, it is only necessary to relieve the pressure on the first joint 7 and connect the second joint 8 to the hydraulic booster pump. At this time, the hydraulic oil enters the inner side of the third slide groove 16. At this time, under the sealing of the second sealing ring 12, the third sealing ring 14 and the fourth sealing ring 15, the piston 13 is pushed downward. At this time, the tension of the bolt is released, and a ratchet wrench is used to insert the connecting hole 5 to loosen the sleeve 6 connected to the bolt. Under the action of the first joint 7 and the second joint 8, the piston 13 can move in both directions.

[0038] In summary, through the intuitive phenomenon that the second sliding column 36 is flush with the top of the sleeve 6, the staff can immediately confirm that the bolt and the sleeve 6 are correctly and completely connected together. The visual feedback mechanism greatly reduces the errors caused by the bolts not being fully tightened or being overtightened, reduces the rework required due to poor connections, further improves the work quality and safety, and can instantly confirm the connection status. Workers do not need to repeatedly check or adjust the tightening of the bolts, thereby saving time and improving work efficiency.

[0039] Hydraulic tensioners apply tension to bolts by precisely controlling the pressure of the hydraulic oil, ensuring a uniform and controllable preload during tightening. When applying tension, the bolt and nut do not rotate relative to each other, thus preventing damage from friction and wear. Hydraulic tensioners can quickly and accurately complete bolt tensioning and tightening, significantly reducing work time. Simultaneously, their ease of operation reduces labor intensity and improves work efficiency.

[0040] Those skilled in the art will appreciate that various combinations and / or combinations of features described in the various embodiments and / or claims of the present invention may be employed, even if such combinations and / or combinations are not explicitly described in the present invention. In particular, various combinations and / or combinations of features described in the various embodiments and / or claims of the present invention may be employed without departing from the spirit and teachings of the present invention. All such combinations and / or combinations fall within the scope of the present invention.

Claims

1. A double-acting hydraulic bolt tensioner, comprising a housing (1), characterized in that: A third slide groove (16) is provided inside the housing (1), a shell cover (4) is fixed to the top of the inner wall of the third slide groove (16), a piston (13) is slidably connected to the inner side of the third slide groove (16), and a sleeve (6) for connecting with a bolt is inserted into the inner side of the piston (13); A connection hole (5) is provided on the top of the sleeve (6), and a prompt component (3) is provided on one side of the sleeve (6); A first joint (7) and a second joint (8) for the piston (13) to move in two directions, up and down, are respectively installed on one side of the housing (1); The prompt component (3) includes a slide plate (33), a first slide column (32) and a second slide column (36) are fixed on both sides of the slide plate (33), a spring (35) is sleeved on the outside of the second slide column (36), a second slide groove (34) is provided inside the sleeve (6), and a first slide groove (31) is provided inside the second slide groove (34).

2. A double-acting hydraulic bolt tensioner according to claim 1, characterized in that: The first joint (7) and the second joint (8) are both connected to the third slide groove (16), and a hand strap (2) is fixed to the outside of the shell (1).

3. A double-acting hydraulic bolt tensioner according to claim 2, characterized in that: The outer side of the slide plate (33) is slidably connected to the inner side of the second slide groove (34), the outer side of the second slide column (36) is slidably connected to the inner side of the first slide groove (31), and the two ends of the spring (35) are respectively connected to one side of the slide plate (33) and the second slide groove (34).

4. The double-acting hydraulic bolt tensioner according to claim 1, characterized in that: A second limiting groove (11) is formed on the inner wall of the third sliding groove (16), and a first sealing ring (10) seamlessly slidably connected to the outer side of the piston (13) is connected to the inner side of the second limiting groove (11).

5. The double-acting hydraulic bolt tensioner according to claim 1, characterized in that: A first limiting groove (9) is formed on the outside of the piston (13), and a second sealing ring (12) is connected to the inside of the first limiting groove (9) and is seamlessly slidably connected to the inner wall of the third sliding groove (16).

6. The double-acting hydraulic bolt tensioner according to claim 1, characterized in that: The bottom of the shell cover (4) is respectively connected to a third sealing ring (14) and a fourth sealing ring (15); the outer side of the third sealing ring (14) is respectively connected between the housing (1) and the shell cover (4); and the outer side of the fourth sealing ring (15) is seamlessly slidably connected to the outer side of the piston (13).

7. The double-acting hydraulic bolt tensioner according to claim 1, characterized in that: When the first joint (7) delivers hydraulic oil to the inside of the third chute (16), the piston (13) pushes the sleeve (6) to move upward, and when the second joint (8) delivers hydraulic oil to the inside of the third chute (16), the piston (13) drives the sleeve (6) to move downward.

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