Four-stage bolt tensioner

Abstract

The utility model discloses a four-stage bolt tensioner which comprises a support, a ferrule is arranged at the lower end of an inner hole of the support, a multi-stage oil cylinder mechanism is connected to the upper end of the inner hole of the support in an inserted mode, the multi-stage oil cylinder mechanism comprises four oil cylinder assemblies which are sequentially arranged in the axial direction of the inner hole of the support, and each oil cylinder assembly comprises an oil cylinder. A piston is arranged in the oil cylinder in a sliding fit mode, a nut is connected to the inner side of the upper end of the multi-stage oil cylinder mechanism in an inserted mode, a pull rod is connected into internal threads of the nut in a screwed mode, a cylinder cover is connected to the outer side of the upper end of the multi-stage oil cylinder mechanism in a threaded mode, and an oil path block is connected to one side of the multi-stage oil cylinder mechanism through a second screw. The outer side end of the oil path block is in threaded connection with a connecting shaft, and the connecting shaft is connected with a male connector through a rotating block. According to the invention, the bolt fastening torque is uniform and accurate, the installation and maintenance quality is greatly improved, the maintenance period is shortened, the working efficiency is improved, the labor intensity is reduced, and the problem of use under the condition that the diameter direction is limited is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of stretcher, specifically, especially relates to a four-stage bolt stretcher. BACKGROUND

[0002] The bolt stretcher is generally composed of a hydraulic pump, a high-pressure hose, a pressure gauge and a stretching body. When the bolt stretcher is working, the high-pressure oil output by the power source is delivered to the closed space formed by the cylinder body and the piston through the high-pressure hose, and the piston in the cylinder body moves up under the pressure, so that the bolt threaded with the piston is elongated. When the bolt is elongated to the required deformation, the bolt is pre-tightened or disassembled, and finally the working bolt is restored to its original shape by hydraulic or mechanical return, completing the whole working process. In the structure of the above-mentioned existing bolt stretcher, the bolt stretcher usually has only one cylinder body and one piston. When the system pressure is constant, the stretching force can be met under the condition that the space where the bolt stretcher is located is large enough. However, when the space where the bolt stretcher is located is limited, the diameter of the cylinder body will also be limited, so that the stretching force of the bolt stretcher cannot meet the requirements, and improvement is needed. SUMMARY

[0003] In view of the above technical problems in the related art, the utility model provides a four-stage bolt stretcher, which can solve the above problems.

[0004] To achieve the above technical purposes, the technical scheme of the utility model is as follows:

[0005] A four-stage bolt stretcher, comprising a support, a sleeve ring is arranged at the lower end of the inner hole of the support, a multi-stage oil cylinder mechanism is inserted into the upper end of the inner hole of the support, the multi-stage oil cylinder mechanism comprises four groups of oil cylinder assemblies arranged in the axial direction of the inner hole of the support in sequence, each oil cylinder assembly comprises an oil cylinder, a piston is slidably fitted in the oil cylinder, a nut is inserted into the inner side of the upper end of the multi-stage oil cylinder mechanism, a pull rod is screwed onto the internal threads of the nut, a cylinder cover is threadedly connected to the outer side of the upper end of the multi-stage oil cylinder mechanism, an oil way block is connected to one side of the multi-stage oil cylinder mechanism through a screw, a counting assembly is connected to the upper end of the oil way block, a connecting shaft is threadedly connected to the outer side end of the oil way block, and a male connector is connected to the connecting shaft through a rotating block.

[0006] Further, an upper groove and a lower groove are arranged in the inner hole of the support, a retaining ring two and a retaining ring one are respectively arranged in the upper groove and the lower groove, the upper end surface of the retaining ring one is provided with the sleeve ring, and the lower end surface of the retaining ring two is connected with a compression spring through a spring fixing ring.

[0007] Further, the side end of the support is provided with an observation hole, the middle part of the sleeve ring is provided with a positioning installation hole matched with the flange nut, and the side surface of the sleeve ring is provided with a poking hole matched with the poking rod.

[0008] Further, the four groups of oil cylinder assemblies are sequentially arranged from bottom to top as oil cylinder assembly one, oil cylinder assembly two, oil cylinder assembly three and oil cylinder assembly four, a sealing ring one is arranged between the small-diameter inner hole of the oil cylinder and the piston, and a sealing ring two is arranged between the large-diameter inner hole of the oil cylinder and the piston.

[0009] Further, the oil cylinder of the oil cylinder assembly one is connected with the support through a screw one, the nut is inserted into the inner hole of the piston of the oil cylinder assembly four, and the cylinder cover is threadedly connected to the oil cylinder of the oil cylinder assembly four.

[0010] Further, one end of the pull rod passes through the nut and is sleeved with a pull rod disc spring, the other end of the pull rod passes through the multi-stage oil cylinder mechanism and extends into the inner hole of the support, the upper end surface of the pull rod is provided with a first adjusting hole, the lower end surface of the pull rod is provided with a second avoiding hole, and the nut is further connected with the pull rod through a jackscrew one.

[0011] Further, the outer side surface of the cylinder cover is connected with a handle through a handle fixing ring, and the upper end surface of the cylinder cover is provided with a through hole for the upper end part of the pull rod to pass through.

[0012] Further, the inner side of the oil way block is provided with an oil way, the oil way is in communication with the oil cavity of the oil cylinder and the input end of the male connector respectively, the side surface of the oil cylinder is provided with a connecting groove, the oil way block is provided with a connecting block matched with the connecting groove, and a sealing ring three is arranged between the connecting block and the connecting groove.

[0013] Further, the counting assembly comprises a plunger installed in the inner hole of the upper end of the oil way block, a jackscrew two is threadedly connected in the central inner hole of the plunger, the lower end of the jackscrew two extends into the oil way, the upper end of the jackscrew two is sleeved with a positioning column, the outer circle of the positioning column is sleeved with a counter disc spring, the upper end surface of the positioning column is provided with a counter, and the upper end of the oil way block is connected with a counter upper cover through a jackscrew three, and the counter is installed in the counter upper cover.

[0014] The bolt fastening torque is uniform and accurate, the installation and maintenance quality is greatly improved, the maintenance cycle is shortened, the work efficiency is improved, the labor intensity is reduced, and the working condition of diameter limitation is solved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings described in the following embodiments are only some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0016] The present application will be further described in detail below with reference to the drawings.

[0017] Figure 1 is a front view of a four-stage bolt stretcher according to an embodiment of the present application;

[0018] Figure 2 is an axial sectional view of a four-stage bolt stretcher according to an embodiment of the present application;

[0019] Figure 3 is an axial sectional view of an oil passage block according to an embodiment of the present application;

[0020] Figure 4 is a scene diagram of a four-stage bolt stretcher in use according to an embodiment of the present application.

[0021] In the drawings:

[0022] 1, support; 2, retainer ring 1; 3, sleeve ring; 4, compression spring; 5, spring fixing ring; 6, retainer ring 2; 7, oil cylinder; 8, screw 1; 9, sealing ring 1; 10, piston; 11, sealing ring 2; 12, nut; 13, pull rod; 14, jackscrew 1; 15, pull rod disc spring; 16, cylinder cover; 17-1, handle fixing ring; 17-2, handle; 18, retainer ring 3; 19, screw 2; 20, oil passage block; 21, sealing ring 3; 22, plunger; 23, jackscrew 2; 24, positioning column; 25, counter disc spring; 26, counter; 27, counter upper cover; 28, jackscrew 3; 29, connecting shaft; 30, sealing ring 4; 31, rotating block; 32, retainer ring 4; 33, fixed cover; 34, screw 3; 35, male connector; 36, lever; 37, fan tower; 38, flange nut; 39, flange bolt; 40, ratchet wrench. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0024] As Figures 1-3The utility model discloses a four -stage bolt stretcher, including support 1, the inner hole lower extreme of support 1 is equipped with a ferrule 3, the inner hole upper extreme of support 1 is inserted with multistage oil cylinder mechanism, multistage oil cylinder mechanism includes four groups of oil cylinder subassembly in turn arranged along the inner hole axial direction of support, oil cylinder subassembly includes oil cylinder 7, the piston 10 of sliding fit has in oil cylinder 7, the inside of multistage oil cylinder mechanism upper end inserts nut 12, the inside screw thread of nut 12 is connected with pull rod 13, the upper end outside of multistage oil cylinder mechanism is connected with cylinder cover 16 with screw, one side of multistage oil cylinder mechanism is connected with oil passage block 20 through screw two 19, the upper end of oil passage block 20 is connected with counting assembly, the outside end of oil passage block 20 is connected with a connecting shaft 29 with screw, connecting shaft 29 is connected with a male joint 35 through a swivel block 31.

[0025] Embodiment one:

[0026] The inner hole of the support 1 of the present application is provided with a ferrule 3, the lower end face of the ferrule 3 is provided with a stop ring I, and is installed in the groove below the inner hole of the support, the upper end face of the ferrule 3 is provided with a compression spring 4, the upper end of the compression spring 4 is provided with a spring fixing ring 5, the upper end of the spring fixing ring 5 has a stop ring II 6 and is installed in the groove above the inner hole of the support.

[0027] The inner hole of the support 1 of the present application is provided with a ferrule 3, the lower end face of the ferrule 3 is provided with a stop ring I, and is installed in the groove below the inner hole of the support, the upper end face of the ferrule 3 is provided with a compression spring 4, the upper end of the compression spring 4 is provided with a spring fixing ring 5, the upper end of the spring fixing ring 5 has a stop ring II 6 and is installed in the groove above the inner hole of the support. The inner hole of the support 1 of the present application is provided with a ferrule 3, the lower end face of the ferrule 3 is provided with a stop ring I, and is installed in the groove below the inner hole of the support, the upper end face of the ferrule 3 is provided with a compression spring 4, the upper end of the compression spring 4 is provided with a spring fixing ring 5, the upper end of the spring fixing ring 5 has a stop ring II 6 and is installed in the groove above the inner hole of the support.

[0028] The side of the four groups of oil cylinder assemblies is provided with an oil passage block 20 fixed on the oil cylinder assembly by a plurality of screws 19, a connecting lug on the oil passage block 20 and a connecting groove on the oil cylinder assembly are provided with a sealing ring 3 to seal an oil passage hole, a plunger 22 is arranged in an inner hole of the upper end of the oil passage block 20, the center inner hole of the plunger 22 is threadedly connected with a jackscrew 2, a positioning column 24 is sleeved on the jackscrew 2, a counter disc spring 25 is sleeved on the outer circle of the positioning column 24, a counter 26 is arranged on the upper end surface of the positioning column 24 and passes through the inner hole of the oil passage block 20, the outer circle of the counter 26 is sleeved with a counter upper cover 27, and the counter upper cover 27 is connected and fixed with the oil passage block 20 by a jackscrew 3, the four connecting lugs of the oil passage block 20 are threadedly connected with a connecting shaft 29, the front end outer circle groove of the connecting shaft 29 is provided with two sealing rings 4, the outer circle of the sealing rings 4 is sleeved with a rotating block 31, the end surface of the rotating block 31 is provided with a check ring 4 and is arranged in the outer circle groove of the front end of the connecting shaft 29, a fixed cover 33 is arranged on the top end of the connecting shaft 29, and the center hole is provided with a screw 3 to be fixed with the connecting shaft 29, the side surface of the rotating block 31 is threadedly connected with a male connector 35, and the stretching device is used in cooperation with a accessory lever 36 and a ratchet wrench 40 during operation to complete the operation.

[0029] As Figure 4 shown, in specific use, the following steps are included:

[0030] S1, the four-stage bolt stretcher is placed on the outer hexagonal upper side of the flange nut 38 to be locked, the ratchet wrench 40 is inserted into the first adjusting hole (four-square hole) on the upper end surface of the pull rod 13, the pull rod 13 is rotated clockwise to make the inner thread in the lower end surface avoiding hole threadedly combined with the flange bolt 39, when the lower end surface of the support 1 is in full contact with the flange surface of the fan tower 37, the ratchet wrench 40 is pulled out, the lever 36 is used to drive the sleeve ring 3 through the observation hole of the support 1, and under the pressure of the compression spring 4, the sleeve ring 3 is completely sleeved on the hexagonal of the flange nut 38;

[0031] S2, the oil pipe and the stretcher pump station are connected through the male connector 35;

[0032] S3, the pressure is increased to the correct pressure, the stretcher starts to work, the sleeve ring 3 is rotated clockwise by using the lever 36, the sleeve ring 3 drives the flange nut 38 to rotate until it is locked;

[0033] S4, the pressure is slowly released, at this time, the pull rod disc spring 15 is completely retracted, the stretcher returns to the initial state, the pull rod 13 is separated from the flange bolt 39 by rotating the ratchet wrench counterclockwise, the stretcher is removed, and the operation is completed.

[0034] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A four-stage bolt tensioner, characterized in that: The invention comprises a support (1), wherein a ring (3) is provided at the lower end of the inner hole of the support (1), a multi-stage oil cylinder mechanism is inserted at the upper end of the inner hole of the support (1), the multi-stage oil cylinder mechanism comprises four groups of oil cylinder assemblies arranged in sequence along the axial direction of the inner hole of the support, the oil cylinder assembly comprises an oil cylinder (7), a piston (10) is slidably fitted in the oil cylinder (7), a nut (12) is inserted at the inner side of the upper end of the multi-stage oil cylinder mechanism, a pull rod (13) is screwed into the inner thread of the nut (12), the outer side of the upper end of the multi-stage oil cylinder mechanism is threadedly connected to a cylinder cover (16), one side of the multi-stage oil cylinder mechanism is connected to an oil circuit block (20) by screw 2 (19), the upper end of the oil circuit block (20) is connected to a counting assembly, the outer end of the oil circuit block (20) is threadedly connected to a connecting shaft (29), and the connecting shaft (29) is connected to a male joint (35) through a rotating block (31).

2. A four-stage bolt tensioner according to claim 1, characterized in that: An upper groove and a lower groove are provided in the inner hole of the support (1), and a retaining ring 2 (6) and a retaining ring 1 (2) are installed in the upper groove and the lower groove respectively. The upper end surface of the retaining ring 1 (2) is provided with the ferrule (3), and the lower end surface of the retaining ring 2 (6) is connected to a compression spring (4) via a spring fixing ring (5).

3. A four-stage bolt tensioner according to claim 2, characterized in that: An observation hole is provided at the side end of the support (1), a positioning installation hole adapted to the flange nut is provided at the middle of the ferrule (3), and a shifting hole adapted to the shifting rod (36) is provided on the side of the ferrule (3).

4. A four-stage bolt tensioner according to claim 1, characterized in that: The four groups of oil cylinder assemblies are oil cylinder assembly 1, oil cylinder assembly 2, oil cylinder assembly 3 and oil cylinder assembly 4 from bottom to top. A sealing ring 1 (9) is provided between the small-diameter inner hole of the oil cylinder (7) and the piston (10), and a sealing ring 2 (11) is provided between the large-diameter inner hole of the oil cylinder (7) and the piston (10).

5. A four-stage bolt tensioner according to claim 4, characterized in that: The oil cylinder (7) of the oil cylinder assembly one is connected to the support (1) via a screw (8), the nut (12) is inserted into the inner hole of the piston of the oil cylinder assembly four, and the cylinder cover (16) is threadedly connected to the oil cylinder (7) of the oil cylinder assembly four.

6. A four-stage bolt tensioner according to claim 5, characterized in that: One end of the pull rod (13) passes through the nut (12) and is sleeved with a pull rod disc spring (15), and the other end of the pull rod (13) passes through the multi-stage cylinder mechanism and extends into the inner hole of the support (1). The upper end surface of the pull rod (13) is provided with a first adjustment hole, and the lower end surface of the pull rod (13) is provided with a second avoidance hole. The nut (12) is also connected to the pull rod (13) through a top screw (14).

7. A four-stage bolt tensioner according to claim 6, characterized in that: The outer side surface of the cylinder cover (16) is connected to a handle (17-2) via a handle fixing ring (17-1), and the upper end surface of the cylinder cover (16) is provided with a through hole for the upper end of the pull rod (13) to pass through.

8. A four-stage bolt tensioner according to claim 1, characterized in that: An oil circuit is provided on the inner side of the oil circuit block (20), and the oil circuit is respectively connected to the oil chamber in the oil cylinder (7) and the input end of the male connector (35). A connecting groove is provided on the side of the oil cylinder (7). A connecting protrusion adapted to the connecting groove is provided on the oil circuit block (20), and a sealing ring (21) is provided between the connecting protrusion and the connecting groove.

9. A four-stage bolt tensioner according to claim 8, characterized in that: The counting assembly includes a plunger (22) installed in the inner hole of the upper end of the oil circuit block (20), a second top screw (23) is threadedly connected in the central inner hole of the plunger (22), the lower end of the second top screw (23) extends into the oil circuit, the upper end of the second top screw (23) is sleeved with a positioning column (24), the outer circle of the positioning column (24) is sleeved with a counter disc spring (25), the upper end surface of the positioning column (24) is provided with a counter (26), the upper end of the oil circuit block (20) is connected to a counter upper cover (27) through a third top screw (28), and the counter (26) is installed in the counter upper cover (27).

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