Two-stage intelligent hydraulic bolt tensioner

Abstract

The utility model discloses a two-stage intelligent hydraulic bolt tensioner which comprises a pull rod, the pull rod is sequentially sleeved with a nut, a second piston and a first piston from top to bottom, the nut is sleeved with a cylinder cover, a reset spring is arranged between the nut and the cylinder cover, the second piston is sleeved with a second cylinder body, and the second cylinder body is sleeved with a piston rod. A first cylinder body is arranged outside the first piston in a sleeving mode, a shell is arranged at the bottom end of the first cylinder body, and the pull rod is sleeved with the shell. The ultrahigh-pressure hydraulic pump supplies oil to the hydraulic cylinder through the quick connector, the piston in the hydraulic cylinder pushes the pull rod to pull the bolt to stretch under the action of high-pressure oil, and the strain gauge in the pressure load sensor deforms under the counter-acting force. The acquisition circuit board acquires an analog signal of deformation, converts the analog signal into a digital signal and sends the digital signal to the data receiver to realize accurate oil supply of the ultrahigh pressure hydraulic pump, so that the purposes of sensing the tensile force of the bolt on line in real time and accurately controlling the pre-tightening force of the bolt are achieved, and the mounting quality and the construction efficiency are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to bolt stretching technical field, specifically, relate to a two -stage intelligent hydraulic bolt stretcher. BACKGROUND

[0002] In the equipment assembly process, the installation bolt reaches certain pre -tightening force, makes the connecting part stress even. Bolt stretcher is a kind of hydraulic source provided with the help of hydraulic booster pump, according to the tensile strength, yield coefficient and elongation of material determine the stretching force, utilize the stretching force generated by superhigh pressure oil pump, the bolt subjected to force is lengthened in its elastic deformation zone, bolt diameter slightly deforms, so that the nut is easy to loosen or tighten, no torsional shear force and lateral force, no friction damage to the contact surface of coupling, hydraulic bolt stretcher is widely applied in multiple technical fields, mainly including mechanical manufacturing, building industry, petroleum chemical industry, electric power, shipbuilding industry, metallurgy coal mine etc. But the existing bolt stretcher cannot perceive bolt stretching force, cannot accurately control the pre -tightening force of bolt.

[0003] For the above problems, there is no effective solution at present. CONTENT OF UTILITY MODEL

[0004] For the above technical problems in the related art, the utility model provides a two -stage intelligent hydraulic bolt stretcher, which can overcome the above shortcomings of the prior art.

[0005] To achieve the above technical purposes, the technical scheme of the utility model is as follows:

[0006] A two -stage intelligent hydraulic bolt stretcher, including draw bar, the draw bar is sequentially sleeved with nut, piston two and piston one from top to bottom, the outside of the nut is sleeved with cylinder cover, reset spring is arranged between the nut and the cylinder cover, the piston two is externally sleeved with cylinder body two, the piston one is externally sleeved with cylinder body one, the bottom of the cylinder body one is equipped with the shell, the shell is sleeved on the outside of the draw bar;

[0007] The shell is externally provided with pressure load sensor, the bottom end of the draw bar is internally provided with cavity, the lower end of the draw bar is connected with the sleeve ring, the sleeve ring is externally provided with control box assembly and gear box assembly, the upper portion of the control box assembly is provided with the gear box assembly, the outside of the cylinder body one and the cylinder body two is provided with quick coupling, the quick coupling is connected with superhigh hydraulic pump, and the superhigh hydraulic pump is connected with data receiver.

[0008] Further, the cylinder body one, the cylinder body two and the outer end of the cylinder cover are flush.

[0009] Further, the control box assembly is connected with pressure load sensor and data receiver in communication.

[0010] Furthermore, a switch and an indicator light are provided on the front of the control box assembly, a charging port is provided on the side of the control box assembly, and a signal window is provided on the bottom of the control box assembly.

[0011] Furthermore, the control box assembly includes a control box and a control box cover, and the control box is provided with a circuit display board, a Bluetooth module, an acquisition circuit board and a lithium battery module.

[0012] The beneficial effects of the present invention are as follows: the ultra-high pressure hydraulic pump of the present invention supplies oil to the hydraulic cylinder through a quick connector. The piston in the hydraulic cylinder pushes the pull rod to pull the bolt for stretching under the action of high-pressure oil. The strain gauge inside the pressure load sensor is deformed under the reaction force. The acquisition circuit board collects the analog signal of the deformation and converts it into a digital signal and sends it to the data receiver to realize the precise oil supply of the ultra-high pressure hydraulic pump, thereby realizing online real-time perception of the bolt tensile force and achieving the purpose of precise control of the bolt pre-tightening force, solving the problem of online measurement of the bolt tightening tensile force, integrating construction and detection, and improving installation quality and construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 This is a structural diagram of a two-stage intelligent hydraulic bolt tensioner according to an embodiment of the present utility model;

[0015] Figure 2 This is a schematic diagram of the three-dimensional structure of a two-stage intelligent hydraulic bolt tensioner according to an embodiment of the present utility model;

[0016] Figure 3 is a cross-sectional view of a two-stage intelligent hydraulic bolt tensioner according to an embodiment of the present utility model;

[0017] Figure 4 1. It is a bottom view of the control box assembly of the dual-stage intelligent hydraulic bolt tensioner according to an embodiment of the present utility model;

[0018] Figure 5 is a cross-sectional view of a control box assembly of a two-stage intelligent hydraulic bolt tensioner according to an embodiment of the present utility model;

[0019] In the figure: 1. Ring; 2. Pull rod; 3. Cylinder body 1; 4. Piston 1; 5. Cylinder body 2; 6. Piston 2; 7. Nut; 8. M cylinder head; 9. Return spring; 10. Quick connector 11. Gear box assembly; 12. Control box assembly; 13. Pressure load sensor; 1201. Control box; 1202. Control box cover; 1203. Circuit display board; 1204. Indicator light; 1205. Switch; 1206. Charging port; 1207. Collection circuit board; 1208. Signal window; 1209. Lithium battery module; 1210. Bluetooth module; 14. Bolt under test. DETAILED DESCRIPTION

[0020] 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 are within the scope of protection of the present invention.

[0021] like Figures 1-4 As shown, a two-stage intelligent hydraulic bolt tensioner according to an embodiment of the present utility model includes a pull rod 2, the pull rod 2 is sequentially sleeved with a nut 7, a piston 2 6 and a piston 1 4 from top to bottom, the outer portion of the nut 7 is sleeved with a cylinder cover 8, a return spring 9 is provided between the nut 7 and the cylinder cover 8, the outer portion of the piston 2 6 is sleeved with a cylinder body 2 5, the outer portion of the piston 1 4 is sleeved with a cylinder body 1 3, the bottom end of the cylinder body 1 3 is provided with a shell, and the shell is sleeved on the outer portion of the pull rod 2;

[0022] A pressure load sensor 13 is provided on the outside of the shell, a cavity is provided inside the bottom end of the pull rod 2, the lower end of the pull rod 2 is connected to the ring 1, a control box assembly 12 and a gear box assembly 11 are provided on the outside of the ring 1, the gear box assembly 11 is provided on the upper part of the control box assembly 12, a quick connector 10 is provided on the outside of the cylinder body 1 3 and the cylinder body 2 5, the quick connector 10 is connected to the ultra-high hydraulic pump, and the ultra-high hydraulic pump is communicatively connected to the data receiver.

[0023] The cylinder body 1 3 and the cylinder body 2 5 are flush with the outer ends of the cylinder cover 8 .

[0024] The control box assembly 12 is communicatively connected to the pressure load sensor 13 and the data receiver respectively.

[0025] like Figures 4-5 As shown, a switch 1205 and an indicator light 1204 are provided on the front of the control box assembly 12 , a charging port 1206 is provided on the side of the control box assembly 12 , and a signal window 1208 is provided on the bottom of the control box assembly 12 .

[0026] The control box assembly 12 comprises a control box 1201 and a control box cover 1202, the control box 1201 is internally provided with a circuit display panel 1203, a Bluetooth module 1210, a collection circuit board 1207 and a lithium battery module 1209.

[0027] The gear box assembly uses a 1 / 2" square hand torque wrench, and the setting value is recommended to be 30-50NM, the gear box square wrench shaft is inserted and rotated into the gear until the nut is tightened.

[0028] The two-stage intelligent hydraulic bolt tensioner adopts elastic stretching deformation on the bolt to generate pre-tightening force on the bolt, and can directly generate EXCEL format original data record, and can store local or send in file form. After collection, the pre-tightening force data can be sent to the data receiver in real time, and the feedback data of the data receiver is automatically adjusted by the super-high pressure hydraulic pump to accurately control the pre-tightening force of the intelligent hydraulic bolt tensioner on the bolt.

[0029] The principle is:

[0030] (1) the pull rod of the intelligent hydraulic bolt tensioner is screwed into the bolt;

[0031] (2) set the force value required for stretching on the data receiver;

[0032] (3) start the super-high pressure hydraulic pump, and the intelligent hydraulic bolt tensioner stretches the bolt;

[0033] (4) the super-high pressure hydraulic pump receives the real-time stretching force value of the intelligent hydraulic bolt tensioner and automatically adjusts the oil pressure;

[0034] (5) the stretching force value received by the data receiver reaches the set value, and the super-high pressure hydraulic pump stops;

[0035] In order to facilitate the understanding of the above technical scheme of the utility model, the above technical scheme of the utility model will be described in detail through specific use mode.

[0036] In specific use, according to the two-stage intelligent hydraulic bolt tensioner, the intelligent two-stage hydraulic bolt tensioner cooperates with the super-high pressure hydraulic pump, the data receiver, the control system and other equipment to realize the tightening of the bolt / nut.

[0037] Figures 1-3 The components in the middle 1-11 are combined into the tension execution component of the intelligent hydraulic bolt tensioner, and the hydraulic cylinders 3, 5, the pistons 4, 6 and the pull rods 2 are replaced to adapt to bolt stretching of different specifications.

[0038] (1) the intelligent hydraulic bolt tensioner is screwed into the bolt.

[0039] (2) The super high pressure hydraulic pump supplies oil to the hydraulic cylinders 3, 5 through the quick connector 10.

[0040] (3) The internal pistons 4, 6 of the hydraulic cylinders 3, 5 push the pull rod 2 upwards under the action of high pressure oil, and the pull rod pulls the bolt to stretch.

[0041] (4) The reaction force of the hydraulic cylinders on the pressure load sensor 13 causes the strain gauge inside the pressure load sensor to deform.

[0042] (5) The acquisition circuit board acquires the analog signal generated due to the deformation of the strain gauge and converts it into a digital signal.

[0043] (6) The MCU circuit board analyzes and operates the digital signal and transmits it in real time in a wireless form.

[0044] (7) The tension value is reached by controlling the oil supply pressure.

[0045] (8) Under the condition of stopping oil supply or not changing the oil pressure, the nut is locked by the nut sleeve 1. The high pressure in the hydraulic cylinders 3, 5 is unloaded on the super high pressure hydraulic pump, and the pull rod 2 is rotated out of the bolt.

[0046] (9) The pistons 4, 6 are automatically reset under the action of the reset spring 9, and the intelligent hydraulic bolt stretcher is removed for stretching the next bolt.

[0047] In summary, by means of the above technical scheme of the utility model, the super high pressure hydraulic pump supplies oil to the hydraulic cylinders through the quick connector, the piston in the hydraulic cylinder pushes the pull rod to pull the bolt to stretch under the action of high pressure oil, the strain gauge inside the pressure load sensor deforms under the reaction force, the acquisition circuit board acquires the analog signal of the deformation and converts it into a digital signal and sends it to the data receiver to realize accurate oil supply of the super high pressure hydraulic pump, so as to realize online real-time sensing of the bolt stretching force and achieve the purpose of accurately controlling the pre-tightening force of the bolt, solve the problem of online measurement of the bolt fastening stretching force, and realize construction and detection integration, improve installation quality and construction efficiency.

[0048] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A two-stage intelligent hydraulic bolt tensioner, characterized in that: It comprises a pull rod (2), wherein the pull rod (2) is provided with a nut (7), a second piston (6) and a first piston (4) in sequence from top to bottom, the outer portion of the nut (7) is provided with a cylinder cover (8), a return spring (9) is provided between the nut (7) and the cylinder cover (8), the outer portion of the second piston (6) is provided with a second cylinder body (5), the outer portion of the first piston (4) is provided with a first cylinder body (3), the bottom end of the first cylinder body (3) is provided with a shell, and the shell is provided on the outer portion of the pull rod (2); A pressure load sensor (13) is provided on the outside of the shell, a cavity is provided on the inside of the bottom end of the pull rod (2), the lower end of the pull rod (2) is connected to the ring (1), a control box assembly (12) and a gear box assembly (11) are provided on the outside of the ring (1), the gear box assembly (11) is provided on the upper part of the control box assembly (12), and a quick connector (10) is provided on the outside of the cylinder body 1 (3) and the cylinder body 2 (5), the quick connector (10) is connected to the ultra-high hydraulic pump, and the ultra-high hydraulic pump is communicatively connected to the data receiver.

2. The dual-stage intelligent hydraulic bolt tensioner according to claim 1 is characterized in that: The cylinder body 1 (3) and the cylinder body 2 (5) are flush with the outer ends of the cylinder cover (8).

3. The dual-stage intelligent hydraulic bolt tensioner according to claim 1, characterized in that: The control box assembly (12) is communicatively connected to the pressure load sensor (13) and the data receiver respectively.

4. The dual-stage intelligent hydraulic bolt tensioner according to claim 1, characterized in that: The front surface of the control box assembly (12) is provided with a switch (1205) and an indicator light (1204), the side surface of the control box assembly (12) is provided with a charging port (1206), and the bottom surface of the control box assembly (12) is provided with a signal window (1208).

5. The dual-stage intelligent hydraulic bolt tensioner according to claim 1, characterized in that: The control box assembly (12) comprises a control box (1201) and a control box cover (1202). The control box (1201) is provided with a circuit display board (1203), a Bluetooth module (1210), an acquisition circuit board (1207), and a lithium battery module (1209).

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