Hydraulic nut testing equipment

Abstract

A hydraulic nut testing equipment is used for testing the performance parameters of hydraulic nuts. The main shaft is connected to the box body; the hydraulic nut is threadedly connected to the main shaft, and the hydraulic nut is connected to the pressure ring through a pressure transmission ring, and a pressure sensor is provided between the pressure transmission ring and the pressure ring; a vibration motor, an impact assembly and a displacement sensor are installed on the box body; the pressure sensor and the displacement sensor perform static or dynamic testing on the hydraulic nut. The present invention can scientifically collect and store the operating data of the hydraulic nut, and compare it with its design parameters. It can effectively solve the problem of the relationship between the design parameters of the hydraulic nut and the parameters under actual working conditions, provide data support for the design of the hydraulic nut, and provide technical reference for the selection of the working medium of the hydraulic nut. It has a high degree of automation, and the test data is stable and reliable. It can prevent the oil and the like in the equipment from being thrown out, and can also prevent the operator's hair, clothes, etc. from being accidentally entangled in the rotating parts. It has very high safety performance and can meet the parameter testing of hydraulic nuts of different specifications.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic testing, in particular to a testing device for testing design parameters of a hydraulic nut. Background Art

[0002] Hydraulic nuts have many excellent features, such as being able to provide strong, controllable and stable locking pressure, being easy and quick to install and use, being able to achieve higher precision in the locking process, being able to effectively eliminate the vibration of the locked workpiece, and being able to better control the gap between the workpieces, and so on. They have been widely used in the steel, chemical and other industrial fields at home and abroad. However, for the traditional mechanical nuts or open hydraulic nuts, the larger the nut thread specifications, the more difficult it is to lock and prevent loosening. The equipment is easy to loosen after running for a period of time, and it is difficult to install and disassemble. The open hydraulic nuts require an external refueling pump and the oil drain joints need to be frequently disassembled. The leaked hydraulic oil will pollute the environment around the equipment, causing personnel to step on the leaked oil and fall, posing a safety hazard. The nut body is a steel part. The larger the specifications, the greater the product quality and the more difficult it is to install.

[0003] At present, most of the hydraulic nuts used on high-end equipment are imported. In order to replace the imported ones, it is urgent to design a hydraulic nut with stable and reliable locking force, convenient and quick frequent installation and disassembly, light weight, and reduced environmental pollution. It is even more important to study a test equipment to test the design parameters of hydraulic nuts. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a hydraulic nut testing device to simulate the actual working conditions of the hydraulic nut and test its various performance parameters under dynamic and static conditions.

[0005] In order to achieve the above-mentioned purpose of the invention, the main shaft of the present invention is connected to the box body; the hydraulic nut is threadedly connected to the main shaft, the hydraulic nut is connected to the pressure ring through a pressure transmission ring, and a pressure sensor is provided between the pressure transmission ring and the pressure ring; a vibration motor, an impact assembly and a displacement sensor are installed on the box body; the pressure sensor and the displacement sensor perform static or dynamic testing on the hydraulic nut.

[0006] The right end of the left part of the main shaft is fixed to the right end of the box body by screws through a sleeve, and the left end of the left part of the main shaft is fixed to the left end of the box body by screws through a semicircular flange. The left end and the right end of the left part of the main shaft are connected to the sleeve through a left end bearing and a right end bearing respectively. A lubricating oil channel communicating with the left end bearing and the right end bearing is arranged in the sleeve, and a grease nozzle and a plug are arranged on the lubricating oil channel. A sealing ring and a retaining ring are installed on the outside of the left end bearing. The inner ring of the left end bearing is positioned by the retaining ring and the shoulder of the main shaft, and the outer ring is positioned by the sealing ring and the sleeve, and the main shaft locking nut is locked. On the outside of the retaining ring, the inner ring of the right end bearing is positioned with the shoulder of the main shaft through the sleeve 2 placed on the inside thereof, and the outer ring is positioned with the sleeve 1 through the sealing retaining ring placed on the outside of the right end bearing, and the sealing retaining ring is connected with the sleeve 1 with screws; the screw sleeve on the right part of the main shaft is connected with the main shaft through a flat key, the hydraulic nut is threadedly connected with the screw sleeve, the outside of the screw sleeve is locked with locking nut 2 through gasket 1, the pressure transmission ring placed on the inside of the hydraulic nut is connected with the main shaft through a flat key, the pressure transmission ring and the pressure ring are fixed with limiting bolts, and the pressure ring and the main shaft are connected with a flat key.

[0007] The pressure sensor is installed between the pressure transmission ring and the pressure-bearing ring with a fine-tuning bolt. A second gasket is provided between the pressure sensor and the pressure-bearing ring. A locking nut three locks the fine-tuning bolt on the pressure-bearing ring through a gasket. There are three pressure sensors, which are evenly distributed on the circumference of the pressure transmission ring and the pressure-bearing ring.

[0008] The rotating end of the conductive slip ring is fixed on the main shaft through its flange, a thrust bearing is installed between the rotating end and the stationary end, the tight ring of the thrust bearing is connected to the rotating end, the tight ring is driven by the main shaft to rotate with the rotating end, the loose ring of the thrust bearing is connected to the stator end, and the stator end does not rotate; a deep groove ball bearing is installed between the rotating end and the stator end; one end of the test wire is connected to the electrical control cabinet fixed on the base, and the other end passes through the wire guide groove fixed on the box body, and after the contact on the stator end of the conductive slip ring is connected with the contact on the rotating end, it passes through the radial hole 1 and the axial hole 1 of the rotating end in turn, and then passes through the axial hole 2 and the radial hole 2 of the main shaft in turn to connect to the pressure sensor; the displacement sensor wiring does not pass through the conductive slip ring, but is directly connected to the electrical control cabinet through the wire groove.

[0009] The main shaft is connected with a driving reduction motor installed on the base via a coupling.

[0010] The vibration motor is fixed at the middle of the left side of the lower part of the box body.

[0011] The displacement sensor is fixed on the right side of the box body through a displacement sensor support, and the displacement sensor is in contact with the pressure ring.

[0012] The cylinder body of the impact assembly is fixed on the box body, and the piston rod end of the impact assembly extends out to hit the main shaft.

[0013] The box body is fixedly mounted on the base, and is provided with a door and a hanging ring; the left end of the base is hinged to a hinge fixed on the ground, and shock-absorbing springs are respectively arranged between the middle part and the right end of the base and the ground.

[0014] During the test, firstly, adjust the three pressure sensors to the same digital display through the fine-tuning bolts, then inject the working medium of the hydraulic nut into the hydraulic nut body, and then install the hydraulic nut on the right end of the main shaft and tighten it with the second locking nut. Drive the reduction motor to rotate, and the pressure sensor, hydraulic nut, etc. can be driven to operate together through the main shaft. The frequency of the impact cylinder of the vibration motor and the impact assembly can be set arbitrarily to make the hydraulic nut truly simulate the actual working conditions. Through the pressure sensor and displacement sensor, the internal liquid pressure of the hydraulic nut in static or dynamic state can be tested, and the pressure attenuation curve with time can be output automatically. The relationship curve between pressure and speed of the hydraulic nut in the rotating working state can be automatically generated. At the same time, the relationship between the displacement of the pressure ring, the cavity pressure of the hydraulic nut, and the grease compression ratio in static state can be tested and formed into a curve, and compared with its design parameters.

[0015] Compared with the prior art, the present invention can arbitrarily set the frequency of the vibration motor and the impact cylinder, so that the hydraulic nut can truly simulate the actual working conditions. Through the pressure sensor and the displacement sensor, the various performance parameters of the hydraulic nut in dynamic and static conditions can be measured and recorded in real time. The operation data of the hydraulic nut can be scientifically collected and stored, and compared with its design parameters, which can effectively solve the problem of the relationship between the design parameters of the hydraulic nut and the parameters under actual working conditions, provide data support for the design of the hydraulic nut, and provide technical reference for the selection of the working medium of the hydraulic nut. The automation degree is high, and the test data is stable and reliable. On the one hand, it can prevent the oil in the equipment from being thrown out, and on the other hand, it can also prevent the operator's hair, clothes, etc. from being accidentally entangled in the rotating parts. The safety performance is very high and can meet the parameter testing of hydraulic nuts of different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0017] Figure 2 for Figure 1 A simplified cross-sectional diagram of .

[0018] Figure 3 for Figure 1 Schematic diagram of the pressure sensor fine-tuning structure.

[0019] Figure 4 for Figure 1 Schematic diagram of the main shaft structure.

[0020] Figure 5 for Figure 1 Schematic diagram of the conductive slip ring structure. DETAILED DESCRIPTION

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, the box body 3 of the present invention is installed and fixed on the base 14. The box body 3 is welded by steel plates. The box body 3 is provided with a door 12 and a hanging ring 17. When testing, the door 12 is closed. On the one hand, it can prevent the oil and the like in the equipment from being thrown out, and on the other hand, it can also prevent the operator's hair, clothes, etc. from being accidentally entangled in the rotating parts; the left end of the base 14 is hinged to the hinge 16 fixed on the ground 11, and shock-absorbing springs 22 are respectively provided between the middle part and the right end of the base 14 and the ground 11, which can not only provide a gap for vibration during the test, but also ensure the safety of the overall structure. The main shaft 8 is connected to the driving reduction motor 1 installed on the base 14 through the coupling 15; the right end of the left part of the main shaft 8 is fixed to the right end of the box body 3 by screws through a sleeve 38, and the left end of the left part of the main shaft 8 is fixed to the left end of the box body 3 by screws through a semicircular flange 23. The left end and the right end of the left part of the main shaft 8 are connected to the sleeve 38 through a left end bearing 32 and a right end bearing 35 respectively. A lubricating oil channel 33 communicating with the left end bearing 32 and the right end bearing 35 is provided in the sleeve 38, and a grease nozzle 41 and a plug 40 are provided on the lubricating oil channel 33. The sealing ring 31 and the retaining ring 30 are installed on the outer side of the left end bearing 32. The inner ring of the left end bearing 32 is positioned by the retaining ring 30 and the shoulder of the main shaft 8, and the outer ring is positioned by the sealing ring 31 and the sleeve 38 The spindle locking nut 29 is locked on the outside of the retaining ring 30. The inner ring of the right end bearing 35 is positioned with the shoulder of the spindle 8 through the sleeve 2 34 placed on the inside thereof. The outer ring is positioned with the sleeve 1 38 through the sealing retaining ring 39 placed on the outside of the right end bearing 35. The sealing retaining ring 39 is connected to the sleeve 1 38 with screws; the screw sleeve 42 on the right part of the spindle 8 is connected to the spindle 8 through a flat key 36, the hydraulic nut 10 is threadedly connected to the screw sleeve 42, and the outside of the screw sleeve 42 is locked with a locking nut 26 through a gasket 1 43. The pressure transmission ring 24 placed on the inside of the hydraulic nut 10 is connected to the spindle 8 through a flat key 36, the pressure transmission ring 24 and the pressure ring 5 are connected and fixed with a limiting bolt 37, and the pressure ring 5 and the spindle 8 are connected through a flat key 36. The pressure sensor 20 is installed between the pressure transmission ring 24 and the pressure ring 5 with a fine-tuning bolt 19. A second gasket 28 is provided between the pressure sensor 20 and the pressure ring 5. A locking nut 3 26 locks the fine-tuning bolt 19 on the pressure ring 5 through a gasket 27. There are three pressure sensors 20, which are evenly distributed on the circumference of the pressure transmission ring 24 and the pressure ring 5. The pressure sensor 20 adopts a "pin" structure layout, so that a small-range pressure sensor 20 can be selected to test a larger thrust.The present invention simulates the influence of vibration and impact on the hydraulic nut 10 under actual working conditions by setting a vibration motor 2 and an impact component 4, and can adjust the vibration and impact frequency according to actual needs; the vibration motor 2 is fixed to the middle of the left side of the lower part of the box body 3, and the different vibration frequencies required by the hydraulic nut 10 can be simulated by controlling the rotation speed of the vibration motor 2; the displacement sensor 18 is fixed to the right side of the box body 3 through the displacement sensor support 9, the displacement sensor 18 is in contact with the pressure ring 5, and the displacement of the hydraulic nut 10 can be monitored in real time. The displacement sensor 18 is used to test the relationship curve between the extension amount of the pressure ring 5 of the hydraulic nut 10 and the thrust generated by it, and the state of the working medium of the hydraulic nut 10 under high-speed rotation and long-term static extrusion can be reflected by the curve; the cylinder body of the impact component 4 is fixed on the box body 3, and the piston rod end of the impact component 4 is extended to hit the main shaft 8. When the hydraulic nut 10 is in a rotating or stationary state, the main shaft 8 is hit by the impact cylinder, which can simulate the impact of the hydraulic nut 10 under actual working conditions, and is used to test the working stability and reliability of the hydraulic nut 10. The rotating end 44 of the conductive slip ring 21 is fixed on the main shaft 8 through its flange, and a thrust bearing 45 is installed between the rotating end 44 and the stationary end 47. The tight ring of the thrust bearing 45 is connected to the rotating end 44, and the tight ring is driven by the main shaft 8 to rotate with the rotating end 44. The loose ring of the thrust bearing 45 is connected to the stator end 47, and the stator end 47 does not rotate; a deep groove ball bearing 46 is installed between the rotating end 44 and the stator end 47; one end of the test wire is connected to the electrical control cabinet 7 fixed on the base 14, and the other end passes through the wire guide groove 13 fixed on the box body 3, and passes through the stator end of the conductive slip ring 21. After the contacts on 47 are connected with the contacts of the rotating end 44, they are successively passed through the radial hole 1 49 and the axial hole 1 50 of the rotating end 44, and then successively connected to the pressure sensor 20 through the axial hole 2 48 and the radial hole 25 of the main shaft 8; the wiring of the displacement sensor 18 does not pass through the conductive slip ring 21, but is directly connected to the electrical control cabinet 7 through the wire groove; due to the effect of the conductive slip ring 2, when the main shaft 8 drives the hydraulic nut 10 to rotate together, the three pressure sensors 20 together with the test wires on the pressure sensors 20 will rotate synchronously, while the test wires connected in the wire guide groove 13 remain stationary.

[0022] During the test, firstly, the displacement of the backing plate 28 is changed by fine-tuning the bolt 19, and after the three pressure sensors 20 are adjusted to be consistent in digital display, the working medium of the hydraulic nut 10 is injected into the hydraulic nut body 10, and then the hydraulic nut 10 is installed on the right end of the main shaft 8 and compressed with the locking nut 26. When the reduction motor 1 is driven to rotate, the main shaft 8 drives the pressure sensor 20, the hydraulic nut 10, etc. to operate together. The present invention can arbitrarily set the frequency of the impact cylinder of the vibration motor 2 and the impact assembly 4, so that the hydraulic nut 10 can truly simulate its actual working conditions, test the internal liquid pressure of the hydraulic nut 10 through the pressure sensor 20 and the displacement sensor 18, and can automatically output the pressure decay curve with time, can automatically generate the relationship curve between the pressure and the speed of the hydraulic nut 10 in the rotating working state, can test the relationship between the displacement of the pressure ring 5, the cavity pressure of the hydraulic nut 10, and the grease compression ratio in the static state and form a curve, and compare it with its design parameters.

Claims

1. A hydraulic nut testing device, characterized in that: The main shaft (8) is connected to the housing (3); the hydraulic nut (10) is threadedly connected to the main shaft (8); the hydraulic nut (10) is connected to the pressure ring (5) via a pressure transmission ring (24); a pressure sensor (20) is provided between the pressure transmission ring (24) and the pressure ring (5); a vibration motor (2), an impact assembly (4) and a displacement sensor (18) are installed on the housing (3); the pressure sensor (20) and the displacement sensor (18) perform static or dynamic testing on the hydraulic nut (10); The right end of the left part of the main shaft (8) is fixed to the right end of the box body (3) by means of a sleeve (38) with screws, and the left end of the left part of the main shaft (8) is fixed to the left end of the box body (3) by means of a semicircular flange (23) with screws. The left end and the right end of the left part of the main shaft (8) are connected to the sleeve (38) by means of a left end bearing (32) and a right end bearing (35) respectively. The sleeve (38) is provided with a bearing connected to the left end bearing (32) and the right end bearing (35). The lubricating oil passage (33) is connected to the bearing (35), and a lubricating oil nozzle (41) and a plug (40) are provided on the lubricating oil passage (33). The sealing ring (31) and the retaining ring (30) are installed on the outer side of the left end bearing (32). The inner ring of the left end bearing (32) is positioned by the retaining ring (30) and the shoulder of the main shaft (8), and the outer ring is positioned by the sealing ring (31) and the shaft sleeve (38). The main shaft locking nut (29) is locked on the retaining ring. (30), the inner ring of the right end bearing (35) is positioned with the shaft shoulder of the main shaft (8) through the shaft sleeve 2 (34) placed on the inner side thereof, and the outer ring is positioned with the shaft sleeve 1 (38) through the sealing retaining ring (39) placed on the outer side of the right end bearing (35), and the sealing retaining ring (39) is connected with the shaft sleeve 1 (38) by screws; the screw sleeve (42) on the right part of the main shaft (8) is connected with the main shaft (8) through a flat key (36), the hydraulic nut (10) is threadedly connected with the screw sleeve (42), the outer side of the screw sleeve (42) is locked with the locking nut 2 (6) through the gasket 1 (43), the pressure transmission ring (24) placed on the inner side of the hydraulic nut (10) is connected with the main shaft (8) through a flat key (36), the pressure transmission ring (24) and the pressure ring (5) are connected and fixed by a limiting bolt (37), and the pressure ring (5) and the main shaft (8) are connected by a flat key (36); The pressure sensor (20) is installed between the pressure transmission ring (24) and the pressure-bearing ring (5) by means of a fine-tuning bolt (19); a second gasket (28) is provided between the pressure sensor (20) and the pressure-bearing ring (5); a third locking nut (26) locks the fine-tuning bolt (19) on the pressure-bearing ring (5) via a gasket (27); there are three pressure sensors (20) evenly distributed on the circumference of the pressure transmission ring (24) and the pressure-bearing ring (5).

2. The hydraulic nut testing equipment according to claim 1, characterized in that: The rotating end (44) of the conductive slip ring (21) is fixed to the main shaft (8) through its flange, a thrust bearing (45) is installed between the rotating end (44) and the stator end (47), a tight ring of the thrust bearing (45) is connected to the rotating end (44), the tight ring is driven by the main shaft (8) to rotate with the rotating end (44), the loose ring of the thrust bearing (45) is connected to the stator end (47), and the stator end (47) does not rotate; a deep groove ball bearing (46) is installed between the rotating end (44) and the stator end (47); one end of the test lead is connected to a base (14) fixed thereto. The other end of the lead wire passes through a wire guide groove (13) fixed on the housing (3), and after being connected to the contact point on the stator end (47) of the conductive slip ring (21) and the contact point on the rotating end (44), it passes through the radial hole 1 (49) and the axial hole 1 (50) of the rotating end (44) in sequence, and then passes through the axial hole 2 (48) and the radial hole 2 (25) of the main shaft (8) in sequence to connect to the pressure sensor (20); the wiring of the displacement sensor (18) does not pass through the conductive slip ring (21), but is directly connected to the electrical control cabinet (7) through the wire groove.

3. The hydraulic nut testing equipment according to claim 1, characterized in that: The main shaft (8) is connected to a driving reduction motor (1) mounted on a base (14) via a coupling (15).

4. The hydraulic nut testing equipment according to claim 1, characterized in that: The vibration motor (2) is fixed to the middle of the left side of the lower part of the box body (3).

5. The hydraulic nut testing equipment according to claim 1, characterized in that: The displacement sensor (18) is fixed to the right side of the box body (3) via a displacement sensor support (9), and the displacement sensor (18) is in contact with the pressure ring (5).

6. The hydraulic nut testing equipment according to claim 1, characterized in that: The cylinder body of the impact assembly (4) is fixed on the box body (3), and the piston rod end of the impact assembly (4) extends out to strike the main shaft (8).

7. The hydraulic nut testing equipment according to claim 1, characterized in that: The box body (3) is mounted and fixed on a base (14), and the box body (3) is provided with a door (12) and a hanging ring (17); the left end of the base (14) is hingedly connected to a hinge (16) fixed on the ground (11), and shock-absorbing springs (22) are respectively provided between the middle part and the right end of the base (14) and the ground (11).

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