Three-stage series oil cylinder bolt tensioner

Abstract

The utility model relates to the technical field of bolt tensioners, and discloses a three-stage series oil cylinder bolt tensioner which is characterized in that a first fixing barrel is mounted in a shell, a rotating assembly is arranged in the bottom side of the first fixing barrel, a rotating shaft is mounted in the shell, and a connecting assembly is arranged at the bottom end of the rotating shaft; according to the utility model, the connecting bolt is disassembled through the wrench, and then the convex ring on the internal thread seat is pulled outwards, so that the bottom of the internal thread seat is pulled to be separated from the outer side of the fixed seat, and the proper internal thread seat can be replaced according to the requirement of the internal thread hole of the internal thread seat; when the matched second connecting seat needs to be replaced according to the nut of the bolt, the second connecting seat is pulled outwards, the first magnet on one side of the second connecting seat is separated from the second magnet on the base, and meanwhile, the two ends of the base are separated from the interior of the second slot, so that the replacement of the second connecting seat can be completed, and bolts of different specifications can be matched for use; the universality of the stretcher is greatly improved, and the stretcher is more convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of bolt stretchers, in particular to a bolt stretcher with a three-stage series cylinder. Background Technique

[0002] A bolt stretcher is the abbreviation of a bolt hydraulic stretcher. The hydraulic stretcher relies on the hydraulic source provided by a hydraulic booster pump (ultra-high pressure hydraulic pump). It determines the tensile force according to the tensile strength, yield coefficient and elongation rate of the material. Using the tensile force generated by the ultra-high pressure oil pump, the bolt to which the force is applied is stretched within its elastic deformation zone, and the bolt diameter is slightly deformed, so that the nut is easy to loosen. In addition, it can also be used as a device for applying axial force in hydraulic interference connection for press-fitting installation. The biggest advantage of the stretcher is that multiple bolts can be fixed and disassembled simultaneously with a fixed value, and the force distribution is uniform. It is a safe, efficient and fast tool and the best way to tighten and disassemble bolts of various specifications. It is applied to fields such as petrochemical industry, nuclear power, wind power, hydropower, thermal power, shipbuilding, railway, aerospace, mining, heavy machinery, etc. According to different working conditions and user requirements, special stretchers can be designed. During the use of locomotive connecting rods, it is necessary to stretch the bolts on the connecting rods through a bolt stretcher for convenient actual use.

[0003] Traditional bolt stretchers can usually stretch bolts of one specification. When stretching bolts of various specifications, the stretchers need to be replaced, which results in poor versatility of the stretchers and inconvenient use. Therefore, a bolt stretcher with a three-stage series cylinder is proposed. Content of the Utility Model

[0004] The purpose of the utility model is to provide a bolt stretcher with a three-stage series cylinder to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A bolt stretcher with a three-stage series cylinder, including a housing, a first fixed cylinder is installed inside the housing, a rotating assembly is arranged inside the bottom side of the first fixed cylinder, a rotating shaft is installed inside the housing, a connecting assembly is arranged at the bottom end of the rotating shaft, and a stretching assembly is arranged outside the rotating shaft at the top of the housing;

[0006] The connecting component includes a fixed seat, a telescopic spring and a ball. An installation groove is formed at the bottom end of the rotating shaft. The fixed seat is fixedly connected to the bottom of the installation groove. Connecting grooves are formed on both sides of the fixed seat. The telescopic spring is fixedly connected inside the connecting groove. The ball is fixedly connected to one end of the telescopic spring and is located inside the connecting groove. An internally threaded seat is installed on the outer side of the fixed seat. A fixing groove is formed at one end of the internally threaded seat. Limiting grooves are formed on both sides inside the fixing groove. A convex ring is arranged at the other end on the outer side of the internally threaded seat. A connecting bolt is connected between the internally threaded seat and the fixed seat.

[0007] Preferably, the rotating component includes a base and a second connecting seat. The base is fixedly connected to the inner bottom of the first fixed cylinder. A second slot is formed at the bottom of the base. Both ends of the second connecting seat are inserted into the second slot. A plurality of convex columns are arranged inside the second connecting seat. A first magnet is arranged on the top side of the second connecting seat. A second magnet is arranged on the bottom side of the base.

[0008] Preferably, a plurality of outer cylinders are arranged on the outer side of the top end of the housing and located outside the rotating shaft. A piston is sleeved outside the rotating shaft inside the plurality of outer cylinders.

[0009] Preferably, a second fixed cylinder is arranged at the top of the top one of the outer cylinders. A connecting cylinder is arranged at the top of the top one of the pistons. A disc spring is arranged on the outer side of the connecting cylinder. The disc spring is located between the connecting cylinder and the second fixed cylinder.

[0010] Preferably, a gearbox is arranged on the outer side of the housing. A first gear and a second gear are respectively arranged inside the gearbox. The first gear is meshed and connected to the outer side of the second gear. A tooth groove is arranged on the outer side of the top of the first fixed cylinder. The second gear is meshed and connected to the outer side of the tooth groove.

[0011] Preferably, connecting holes are formed on the outer sides of the plurality of outer cylinders. A first connecting seat is installed on the outer sides of the plurality of outer cylinders.

[0012] Preferably, a first slot is formed at the top of the rotating shaft. The connecting hole is communicated with the first connecting seat.

[0013] The utility model adopts the above technical solution, and compared with the prior art, it has the following technical effects: The utility model disassembles the connecting bolt through a wrench, and then pulls the convex ring on the internally threaded seat outwards, so as to pull the bottom of the internally threaded seat away from the outside of the fixed seat, and then the appropriate internally threaded seat can be replaced according to the requirements of the threaded hole inside the internally threaded seat; when it is necessary to replace the matching second connecting seat according to the nut of the bolt, pull the second connecting seat outwards, the first magnet on one side of the second connecting seat is separated from the second magnet on the base, and at the same time, both ends of the base are separated from the inside of the second slot, and then the replacement of the second connecting seat can be completed, which can be used in combination with bolts of different specifications, greatly improving the versatility of the stretcher and making it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 is a schematic structural diagram of the utility model;

[0016] Figure 2 is a schematic right-view structure diagram of the utility model;

[0017] Figure 3 is a schematic left-view sectional structure diagram of the utility model;

[0018] Figure 4 is of the utility model Figure 3 enlarged structure diagram of area A;

[0019] Figure 5 is a schematic structure diagram of the first fixed cylinder of the utility model;

[0020] Figure 6 is a schematic structure diagram of the second connecting seat of the utility model.

[0021] Explanation of reference numerals: 1. housing; 2. first fixed cylinder; 3. rotating shaft; 4. first slot; 5. outer cylinder; 6. piston; 7. connecting bolt; 8. connecting cylinder; 9. second fixed cylinder; 10. disc spring; 11. connecting hole; 12. first connecting seat; 13. installation groove; 14. fixed seat; 15. connecting groove; 16. telescopic spring; 17. ball; 18. internally threaded seat; 19. fixed groove; 20. limiting groove; 21. convex ring; 22. base; 23. second slot; 24. second connecting seat; 25. tooth groove; 26. gear box; 27. first gear; 28. second gear. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limiting conditions that the present application can be implemented. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present application can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present application.

[0024] Embodiment

[0025] Please refer to Figures 1-6 , the present utility model provides a technical solution: a three-stage series cylinder bolt stretcher, including a housing 1, a first fixed cylinder 2 is installed inside the housing 1, a rotating assembly is arranged inside the bottom side of the first fixed cylinder 2, a rotating shaft 3 is installed inside the housing 1, a connecting assembly is arranged at the bottom end of the rotating shaft 3. The arrangement of the rotating assembly and the connecting assembly can match bolts of different specifications for use, greatly improving the versatility of the stretcher and making it more convenient to use; a stretching assembly is arranged outside the rotating shaft 3 at the top of the housing 1.

[0026] By setting up the connection component, the appropriate internal thread seat 18 can be replaced according to the requirements of the internal thread hole in the internal thread seat 18; the connection component includes a fixed seat 14, a telescopic spring 16 and a ball 17. An installation groove 13 is opened at the bottom end of the rotating shaft 3, and the fixed seat 14 is fixedly connected to the bottom of the installation groove 13. Connection grooves 15 are opened on both sides of the fixed seat 14. The telescopic spring 16 is fixedly connected inside the connection groove 15. The ball 17 is fixedly connected to one end of the telescopic spring 16 and is located inside the connection groove 15. An internal thread seat 18 is installed on the outside of the fixed seat 14. A fixing groove 19 is opened at one end of the internal thread seat 18. Limiting grooves 20 are opened on both sides inside the fixing groove 19. A convex ring 21 is arranged at the other end on the outside of the internal thread seat 18. A connection bolt 7 is connected between the internal thread seat 18 and the fixed seat 14; the connection bolt 7 is disassembled by a wrench, and then the convex ring 21 on the internal thread seat 18 is pulled outwards, so as to pull the bottom of the internal thread seat 18 away from the outside of the fixed seat 14. During this process, the ball 17 moves under force into the connection groove 15, and the ball 17 disengages from the inside of the limiting groove 20. After the internal thread seat 18 is disassembled, the requirements of the internal thread hole in the internal thread seat 18 can be met.

[0027] By setting up the rotating component, the replacement of the second connection seat 24 can be quickly completed to match different bolts for use; the rotating component includes a base 22 and a second connection seat 24. The base 22 is fixedly connected to the inner bottom of the first fixed cylinder 2. A second slot 23 is opened at the bottom of the base 22. Both ends of the second connection seat 24 are inserted into the inside of the second slot 23. A number of convex columns are arranged on the inner side of the second connection seat 24. A first magnet is arranged on the top side of the second connection seat 24. A second magnet is arranged on the bottom side of the base 22. When it is necessary to replace the second connection seat 24 adapted to the nut of the bolt, the second connection seat 24 is pulled outwards. The first magnet on one side of the second connection seat 24 disengages from the second magnet on the base 22. At the same time, both ends of the base 22 disengage from the inside of the second slot 23, and the replacement of the second connection seat 24 can be completed.

[0028] In order to fix the nut of the bolt after stretching, a gearbox 26 is arranged on the outside of the housing 1. A first gear 27 and a second gear 28 are respectively arranged inside the gearbox 26. The first gear 27 is meshed and connected to the outside of the second gear 28. A tooth groove 25 is arranged on the outer side of the top of the first fixed cylinder 2. The second gear 28 is meshed and connected to the outside of the tooth groove 25; after the bolt is stretched, the first gear 27 is driven to rotate by a tool, the first gear 27 drives the second gear 28 to rotate, and the second gear 28 drives the first fixed cylinder 2 to rotate, so as to drive the nut inside the second connection seat 24 to rotate and tighten the nut.

[0029] To stretch the bolt, several outer cylinders 5 are arranged at the top of the housing 1 outside the rotating shaft 3. A piston 6 is sleeved outside the rotating shaft 3 inside several outer cylinders 5. A second fixed cylinder 9 is arranged at the top of the top outer cylinder 5. A connecting cylinder 8 is arranged at the top of the top piston 6. A disc spring 10 is arranged outside the connecting cylinder 8. The disc spring 10 is located between the connecting cylinder 8 and the second fixed cylinder 9. When the disc spring 10 is stressed, it is compressed. At the same time, when the stretcher is not in use, it can drive the rotating shaft 3 to reset, thereby driving the piston 6 to reset; Connecting holes 11 are arranged on the outside of several outer cylinders 5. A first connecting seat 12 is installed on the outside of several outer cylinders 5. A first slot 4 is arranged at the top of the rotating shaft 3. The connecting holes 11 communicate with the first connecting seat 12; When using the bolt stretcher, place it outside the bolt to be stretched. The bolt column is inserted into the internal thread seat 18. Insert a tool into the first slot 4, and then rotate the rotating shaft 3 to make the internal thread seat 18 connect to the outside of the bolt column. During this process, one end of the housing 1 abuts above the bolt fixation, and at the same time, the nut of the bolt moves to the inside of the second connecting seat 24. At this time, connect the high-pressure oil pipe to the first connecting seat 12. The high-pressure oil liquid enters the inside of the outer cylinder 5 through the connecting hole 11. The oil liquid pushes the piston 6 to move, thereby pushing the connecting cylinder 8 to move. The connecting cylinder 8 drives the rotating shaft 3 to move upward.

[0030] Working principle or structural principle. When using the bolt stretcher, place it outside the bolt to be stretched. The bolt column is inserted into the internal thread seat 18. Insert a tool into the first slot 4, and then rotate the rotating shaft 3 to make the internal thread seat 18 connect to the outside of the bolt column. During this process, one end of the housing 1 abuts above the bolt fixation, and at the same time, the nut of the bolt moves to the inside of the second connecting seat 24. At this time, connect the high-pressure oil pipe to the first connecting seat 12. The high-pressure oil liquid enters the inside of the outer cylinder 5 through the connecting hole 11. The oil liquid pushes the piston 6 to move, thereby pushing the connecting cylinder 8 to move. The connecting cylinder 8 drives the rotating shaft 3 to move upward. During this process, the disc spring 10 is stressed and compressed. At this time, the rotating shaft 3 drives the bolt rod to move upward, thereby stretching the bolt rod. After the bolt stretching is completed, drive the first gear 27 to rotate through a tool. The first gear 27 drives the second gear 28 to rotate. The second gear 28 drives the first fixed cylinder 2 to rotate, which can drive the nut inside the second connecting seat 24 to rotate and tighten the nut, that is, complete the stretching and fixation of the bolt.

[0031] When it is necessary to stretch different bolts, the connecting bolt 7 is disassembled by a wrench, and then the convex ring 21 on the internal thread seat 18 is pulled outwards, so as to pull the bottom of the internal thread seat 18 away from the outside of the fixed seat 14. During this process, the ball 17 is forced to move into the connecting groove 15, and the ball 17 disengages from the inside of the limiting groove 20. After the internal thread seat 18 is disassembled, the appropriate internal thread seat 18 can be replaced according to the requirements of the threaded hole inside the internal thread seat 18; during installation, the fixing groove 19 at one end of the internal thread seat 18 is aligned with the fixed seat 14, one end of the internal thread seat 18 is sleeved on the outside of the fixed seat 14, and the ball 17 is forced to compress. When the ball 17 moves to the outside of the limiting groove 20, the ball 17 moves into the inside of the limiting groove 20, and then the internal thread seat 18 and the fixed seat 14 are fixed by the connecting bolt 7, and the installation of the internal thread seat 18 can be completed;

[0032] When it is necessary to replace the adapted second connecting seat 24 according to the nut of the bolt, the second connecting seat 24 is pulled outwards, the first magnet on one side of the second connecting seat 24 is separated from the second magnet on the base 22, and at the same time, both ends of the base 22 are separated from the inside of the second slot 23, and the replacement of the second connecting seat 24 can be completed; during installation, by inserting both ends of the base 22 into the inside of the second slot 23, and then the first magnet is adsorbed on the second magnet, the installation of the second connecting seat 24 can be completed, which is time-saving and labor-saving.

[0033] Those skilled in the art can understand that the features recited in the various embodiments and / or claims of the present invention can be combined or combined in various ways, even if such combinations or combinations are not explicitly recited in the present invention. In particular, without departing from the spirit and teachings of the present invention, the features recited in the various embodiments and / or claims of the present invention can be combined and combined in various ways. All such combinations and / or combinations fall within the scope of the present invention.

Claims

1. A three-stage tandem cylinder bolt tensioner, comprising a housing (1), characterized in that: A first fixed cylinder (2) is installed inside the shell (1), a rotating assembly is arranged inside the bottom side of the first fixed cylinder (2), a rotating shaft (3) is installed inside the shell (1), a connecting assembly is arranged at the bottom end of the rotating shaft (3), and a stretching assembly is arranged at the top of the shell (1) outside the rotating shaft (3); The connecting assembly comprises a fixing seat (14), a telescopic spring (16) and a ball (17); a mounting groove (13) is provided at the bottom end of the rotating shaft (3); the fixing seat (14) is fixedly connected to the bottom of the mounting groove (13); connecting grooves (15) are provided on both sides of the fixing seat (14); the telescopic spring (16) is fixedly connected to the inside of the connecting groove (15); the ball (17) is fixedly connected to one end of the telescopic spring (16) and is located inside the connecting groove (15); an internal thread seat (18) is installed on the outside of the fixing seat (14); a fixing groove (19) is provided at one end of the internal thread seat (18); limiting grooves (20) are provided on both sides of the inside of the fixing groove (19); a convex ring (21) is provided at the other end of the outside of the internal thread seat (18); and a connecting bolt (7) is connected between the internal thread seat (18) and the fixing seat (14).

2. A three-stage tandem cylinder bolt tensioner according to claim 1, characterized in that: The rotating assembly comprises a base (22) and a second connecting base (24); the base (22) is fixedly connected to the inner bottom of the first fixed cylinder (2); a second slot (23) is provided at the bottom of the base (22); two ends of the second connecting base (24) are inserted into the second slot (23); a plurality of convex columns are provided on the inner side of the second connecting base (24); a first magnet is provided on the top side of the second connecting base (24); and a second magnet is provided on the bottom side of the base (22).

3. A three-stage tandem cylinder bolt tensioner according to claim 1, characterized in that: The top end of the housing (1) is located outside the rotating shaft (3) and is provided with a plurality of outer cylinders (5), and the interiors of the plurality of outer cylinders (5) are sleeved on the outside of the rotating shaft (3) and are provided with pistons (6).

4. A three-stage tandem cylinder bolt tensioner according to claim 3, characterized in that: A second fixed cylinder (9) is arranged at the top of the outer cylinder (5), a connecting cylinder (8) is arranged at the top of the piston (6), a disc spring (10) is arranged on the outside of the connecting cylinder (8), and the disc spring (10) is located between the connecting cylinder (8) and the second fixed cylinder (9).

5. The three-stage tandem cylinder bolt tensioner according to claim 1 is characterized in that: A gear box (26) is arranged on the outside of the housing (1), and a first gear (27) and a second gear (28) are arranged inside the gear box (26), the first gear (27) is meshingly connected to the outside of the second gear (28), and a tooth groove (25) is arranged on the outside of the top of the first fixed cylinder (2), and the second gear (28) is meshingly connected to the outside of the tooth groove (25).

6. A three-stage tandem cylinder bolt tensioner according to claim 3, characterized in that: The outer sides of the plurality of outer cylinders (5) are each provided with a connection hole (11), and the outer sides of the plurality of outer cylinders (5) are each provided with a first connection seat (12).

7. A three-stage tandem oil cylinder bolt tensioner according to claim 6, characterized in that: A first slot (4) is provided at the top of the rotating shaft (3), and the connecting hole (11) is connected to the first connecting seat (12).

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