A high frequency fatigue actuation device

Abstract

The present invention discloses a high-frequency fatigue actuation device, which belongs to the technical field of fatigue test equipment. A high-frequency fatigue actuation device comprises: an electromagnetic resonance generator, a piston assembly, a first hydraulic cylinder and a second hydraulic cylinder; the piston assembly comprises a piston and a connecting rod; the piston is placed in the first hydraulic cylinder and slides with the inner side wall of the first hydraulic cylinder, and a pressure chamber is formed between the piston and the side wall and top wall of the first hydraulic cylinder; the top end of the connecting rod is connected to the piston, and the bottom end of the connecting rod passes through the bottom side of the first hydraulic cylinder and is connected to the electromagnetic resonance generator; the first hydraulic cylinder is provided with an oil inlet channel and an oil outlet channel respectively connected to the pressure chamber, and the oil outlet channel is also connected to the second hydraulic cylinder through a pipeline. The present invention is based on the Pascal principle, and can realize load amplification according to a certain proportion through hydraulic oil pressure transmission, thereby reducing the power consumption of traditional high-frequency fatigue equipment, and can realize high-frequency vibration of ultra-large force values.

Description

Technical Field

[0001] The invention relates to the technical field of fatigue testing equipment, and in particular to a high-frequency fatigue actuation device. Background Art

[0002] At present, high-frequency fatigue equipment is mainly divided into two types. One adopts hydraulic control method, combined with high-frequency servo valve, to achieve high-frequency vibration of the equipment. This method requires multiple sets of high-pressure, large-flow hydraulic pumps and multiple sets of high-power motors. The hydraulic system is large and complex and needs to be equipped with a cooling system. The manufacturing cost is very expensive, the energy consumption is serious, and it is difficult to achieve high-frequency vibration with ultra-large force.

[0003] Another type of high-frequency vibration equipment that uses mechanical transmission is represented by electromagnetic resonance fatigue equipment. The output shaft of the electromagnetic resonance generating device is rigidly connected to the test piece, and the vibration frequency can reach several hundred Hz. As the load increases, the volume of the electromagnetic resonance generating device also increases, the power also increases, the energy consumption is relatively serious, and it is also difficult to achieve high-frequency vibration with ultra-large force values. Summary of the invention

[0004] The purpose of the present invention is to provide a high-frequency fatigue actuation device to solve the problem that existing high-frequency fatigue equipment is difficult to achieve ultra-large force and high-frequency vibration.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A high-frequency fatigue actuation device comprises: an electromagnetic resonance generator, a piston assembly, a first hydraulic cylinder and a second hydraulic cylinder; the piston assembly comprises a piston and a connecting rod; the piston is placed in the first hydraulic cylinder and slidingly cooperates with the inner side wall of the first hydraulic cylinder, and a pressure chamber is formed between the piston and the side wall and top wall of the first hydraulic cylinder; the top end of the connecting rod is connected to the piston, and the bottom end of the connecting rod passes through the bottom side of the first hydraulic cylinder and is connected to the electromagnetic resonance generator; the first hydraulic cylinder is provided with an oil inlet channel and an oil outlet channel respectively connected to the pressure chamber, and the oil outlet channel is also connected to the second hydraulic cylinder through a pipeline.

[0007] The present invention generates controllable frequency vibration through an electromagnetic resonance generator to drive the piston to vibrate in the first hydraulic cylinder. Since the first hydraulic cylinder is connected to the second hydraulic cylinder, based on the Pascal principle, the load can be amplified in a certain proportion through the hydraulic oil pressure, thereby reducing the power consumption of traditional high-frequency fatigue equipment and achieving high-frequency vibration with ultra-large force values.

[0008] The working process of the high-frequency fatigue actuation device is as follows: (1) The hydraulic oil enters the first hydraulic cylinder from the oil inlet channel. After the pressure chamber is filled with the hydraulic oil, the hydraulic oil enters the second hydraulic cylinder from the oil outlet channel; (2) After the hydraulic oil fills the second hydraulic cylinder, the pressure of the hydraulic oil is applied to the target force value. At this time, the liquid pressures in the first hydraulic cylinder and the second hydraulic cylinder are consistent and the oil supply is stopped; (3) The electromagnetic resonance generator is started to generate a vibration of a certain frequency, and the electromagnetic resonance generator drives the piston in the first hydraulic cylinder to vibrate at a corresponding frequency; (4) Since the cross-sections of the first hydraulic cylinder and the second hydraulic cylinder are in a certain ratio, that is, the cylinder diameter ratio, according to Pascal's principle, the force amplitude of the hydraulic oil in the second hydraulic cylinder will be proportionally amplified according to the cylinder diameter ratio, thereby reducing the power consumption of the traditional high-frequency fatigue equipment when the working frequency of the hydraulic oil in the second hydraulic cylinder is consistent, and correspondingly reducing the volume of the electromagnetic resonance generator. At the same time, high-frequency vibration with ultra-large force can be achieved through the amplification principle.

[0009] Furthermore, the oil inlet channel is transversely arranged on the bottom side of the first hydraulic cylinder; the piston assembly is provided with a delivery channel, and both ends of the delivery channel are respectively connected to the pressure chamber and the oil inlet channel.

[0010] The hydraulic oil of the present invention enters the first hydraulic cylinder from the piston assembly, that is, the hydraulic oil is transported from bottom to top, so as to fill the pressure chamber and ensure that it is not affected by air compression during the working process.

[0011] Furthermore, the above-mentioned delivery channel includes a first oil hole located in the connecting rod and a second oil hole passing through the piston; the two openings of the first oil hole are respectively located on the side wall and the top wall of the connecting rod, and the first oil hole is respectively connected to the first oil hole and the oil inlet channel.

[0012] One of the openings of the first oil hole of the present invention is located on the side wall of the connecting rod, and at the same time, the oil inlet channel is arranged on the bottom side of the first hydraulic cylinder, that is, after the first oil hole is connected with the oil inlet channel, the hydraulic oil will pass through the position where the connecting rod contacts the first hydraulic cylinder. Since the electromagnetic resonance generator generates controllable high-frequency vibration, high-frequency friction will be generated between the connecting rod and the first hydraulic cylinder, and the hydraulic oil can lubricate and dissipate heat for the position where the connecting rod and the first hydraulic cylinder rub.

[0013] Furthermore, the side wall of the connecting rod is provided with an oil ring groove, and the opening of the first oil hole located on the side wall of the connecting rod is located in the oil ring groove; a lubrication ring groove is provided at the position where the first hydraulic cylinder contacts the connecting rod, the oil ring groove is located in the lubrication ring groove, and the width of the lubrication ring groove is greater than the width of the oil ring groove.

[0014] The oil ring groove and the lubrication ring groove of the present invention can facilitate the flow of hydraulic oil, so that the hydraulic oil can surround the connecting rod, thereby facilitating lubrication and heat dissipation. When the width of the lubrication ring groove is greater than the width of the oil ring groove, the movement of the connecting rod will not cause the oil ring groove to separate from the lubrication ring groove, thereby ensuring effective lubrication and heat dissipation.

[0015] Furthermore, a first sealing ring and a second sealing ring are provided at the position where the first hydraulic cylinder contacts the connecting rod, and the lubrication ring groove is located between the first sealing ring and the second sealing ring.

[0016] The first sealing ring and the second sealing ring of the present invention can prevent the hydraulic oil from leaking from the contact position between the connecting rod and the first hydraulic cylinder, thereby ensuring that the hydraulic oil pressure in the oil circuit, the pressure chamber and the second hydraulic cylinder remains unchanged.

[0017] Furthermore, a third sealing ring is provided between the top wall of the connecting rod and the piston, and the third sealing ring is arranged around the first oil hole.

[0018] The first oil hole and the second oil hole of the present invention are respectively located in the connecting rod and the piston. The hydraulic oil is bound to pass through the position between the connecting rod and the piston. The third sealing ring can seal the position between the connecting rod and the piston to prevent the hydraulic oil from leaking from the position between the connecting rod and the piston, resulting in changes in the working pressure of the hydraulic oil.

[0019] Furthermore, the connecting rod extends into the piston and is threadedly connected to the piston; the connecting rod is also connected to a nut, which is in contact with the piston.

[0020] After the connecting rod and the piston of the present invention are fixedly connected by threads, a nut is arranged on the connecting rod. After the nut is tightened, the connecting rod and the piston can be tightly connected under the extrusion of the thread, thereby preventing the connecting rod and the piston from loosening under high-frequency operation.

[0021] Furthermore, the diameter of the first hydraulic cylinder is smaller than the diameter of the second hydraulic cylinder.

[0022] When the diameter of the first hydraulic cylinder of the present invention is smaller than that of the second hydraulic cylinder, force amplification can be achieved. By changing the diameter of the second hydraulic cylinder, the multiple of force amplification can be changed, thereby achieving high-frequency vibration with ultra-large force.

[0023] Furthermore, the first hydraulic cylinder comprises a cylinder body and an upper end cover and a lower end cover respectively arranged at both ends of the cylinder body; an oil overflow port is arranged on the bottom side wall of the cylinder body; and an oil inlet channel and an oil outlet channel are respectively arranged on the lower end cover and the upper end cover.

[0024] Since the hydraulic oil has a high pressure, the hydraulic oil may enter the lower space of the cylinder body from the area between the piston and the first hydraulic cylinder under the action of pressure, and the oil overflow port on the bottom side wall of the cylinder body can discharge the hydraulic oil in the lower space of the cylinder body.

[0025] Furthermore, the oil inlet channel is connected to a control valve via a pipeline.

[0026] The present invention can accurately control the pressure of the hydraulic oil through the control valve, thereby changing the working pressure of the hydraulic oil in the second hydraulic cylinder.

[0027] The present invention has the following beneficial effects:

[0028] (1) The present invention generates controllable frequency vibration through an electromagnetic resonance generator to drive the piston to vibrate in the first hydraulic cylinder. Since the first hydraulic cylinder is the same as the second hydraulic cylinder, based on the Pascal principle, the load can be amplified in a certain proportion through the hydraulic oil pressure, thereby reducing the power consumption of traditional high-frequency fatigue equipment and achieving high-frequency vibration with ultra-large force values.

[0029] (2) The present invention can also lubricate and dissipate heat at the contact point between the connecting rod and the first hydraulic cylinder through hydraulic oil, thereby increasing the service life of the device and avoiding the generation of high temperature between the connecting rod and the first hydraulic cylinder to reduce the maintenance interval time.

[0030] (3) The present invention also has the advantages of small size, simple structure, fast response speed, small control fluctuation, high precision, low noise and low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the high-frequency fatigue actuation device of the present invention;

[0032] Figure 2 It is a structural schematic diagram of the first hydraulic cylinder of the present invention;

[0033] Figure 3 It is a structural schematic diagram of the piston assembly of the present invention.

[0034] In the figure: 10-electromagnetic resonance generator; 20-piston assembly; 21-piston; 22-connecting rod; 24-oil ring groove; 25-nut; 30-first hydraulic cylinder; 31-pressure chamber; 32-oil inlet channel; 33-oil outlet channel; 34-lubricating ring groove; 35-cylinder body; 36-upper end cover; 37-lower end cover; 38-oil overflow port; 40-second hydraulic cylinder; 50-first sealing ring; 51-second sealing ring; 52-third sealing ring; 60-bracket; 70-coupling; 231-first oil hole; 232-second oil hole. DETAILED DESCRIPTION

[0035] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0036] Example

[0037] Please refer to Figure 1 A high-frequency fatigue actuation device comprises: an electromagnetic resonance generator 10, a piston assembly 20, a first hydraulic cylinder 30 and a second hydraulic cylinder 40. A bracket 60 is provided on the top of the electromagnetic resonance generator 10, and the first hydraulic cylinder 30 is mounted on the bracket 60. The top end of the piston assembly 20 is placed in the first hydraulic cylinder 30, and the bottom end is connected to the electromagnetic resonance generator 10 through a coupling 70. The top of the first hydraulic cylinder 30 is connected to the second hydraulic cylinder 40 through a pipeline. In this embodiment, in order to achieve force amplification, the diameter of the first hydraulic cylinder 30 is smaller than the diameter of the second hydraulic cylinder 40.

[0038] Please refer to Figure 2 The first hydraulic cylinder 30 includes a cylinder body 35, and an upper end cover 36 and a lower end cover 37 are respectively provided at the upper and lower ends of the cylinder body 35. The cylinder body 35 is detachably connected to the upper end cover 36 and the lower end cover 37 by bolts, and a sealing ring is provided at the position where the cylinder body 35 is connected to the upper end cover 36 and the lower end cover 37.

[0039] The bottom side wall of the cylinder body 35 is provided with an oil overflow port 38, and a hydraulic joint is provided at the oil overflow port 38. The upper end cover 36 is provided with an oil outlet channel 33, and a pipeline is connected to the oil outlet channel 33 through a hydraulic joint, and the pipeline is connected to the second hydraulic cylinder 40. The lower end cover 37 is provided with an axial hole in the longitudinal direction for installing the connecting rod 22 in the piston assembly 20. The axial hole is provided with a lubrication ring groove 34, a first sealing ring 50 and a second sealing ring 51. The lubrication ring groove 34 is located between the first sealing ring 50 and the second sealing ring 51. After the hydraulic oil enters the axial hole, it is sealed by the first sealing ring 50 and the second sealing ring 51 to prevent the hydraulic oil from overflowing. The lower end cover 37 is provided with an oil inlet channel 32 in the transverse direction, and the orifice of the oil inlet channel 32 is located in the lubrication ring groove 34. The oil inlet channel 32 is connected to the hydraulic oil container through a pipeline, and a control valve is also provided on the pipeline to control the working pressure of the hydraulic oil.

[0040] Please refer to Figure 3 The piston assembly 20 includes a piston 21 and a connecting rod 22. The piston 21 is located in the first hydraulic cylinder 30, and the piston 21 matches the cylinder body 35, so that the piston 21 can slide along the inner wall of the cylinder body 35. The piston 21, the side wall of the cylinder body 35 and the upper end cover 36 together form a pressure chamber 31. In order to prevent the hydraulic oil from overflowing from the gap between the piston 21 and the cylinder body 35, a sealing ring is provided on the outer side of the piston 21. When the piston 21 moves, the sealing ring moves with the piston 21. At the same time, the hydraulic oil has the effect of lubricating and dissipating heat for the movement of the piston 21.

[0041] A threaded hole is provided on the bottom side of the piston 21, and a second oil hole 232 is provided at the bottom of the threaded hole, which penetrates the piston 21. The top end of the connecting rod 22 is fixedly installed in the threaded hole by a thread, and a nut 25 is provided on the outer sleeve of the connecting rod 22. After the connecting rod 22 is connected to the piston 21, the connecting rod 22 and the piston 21 can be tightly connected by tightening the nut 25, so as to avoid looseness between the piston 21 and the connecting rod 22 during the movement. The bottom end of the connecting rod 22 extends from the shaft hole of the lower end cover 37 and is connected to the electromagnetic resonance generator 10 through the coupling 70.

[0042] The middle of the connecting rod 22 is located in the shaft hole, and an oil ring groove 24 is provided on the outer side of the middle of the connecting rod 22. The oil ring groove 24 is located in the lubrication ring groove 34, and the width of the oil ring groove 24 is smaller than the width of the lubrication ring groove 34. During the movement of the connecting rod 22, the oil ring groove 24 is always located in the lubrication ring groove 34. A first oil hole 231 is provided inside the connecting rod 22, and the first oil hole 231 and the second oil hole 232 together serve as a delivery channel for the piston assembly 20. One of the orifices of the first oil hole 231 is located on the top wall of the connecting rod 22, and the other orifice is located in the oil ring groove 24. After the hydraulic oil enters from the oil inlet channel 32, it will enter the pressure chamber 31 from the first oil hole 231 and the second oil hole 232 in sequence. At the same time, the hydraulic oil will also enter the oil ring groove 24 and the lubrication ring groove 34 to lubricate and cool the connecting rod 22.

[0043] The working process of the high-frequency fatigue actuation device is as follows: (1) the hydraulic oil enters the first hydraulic cylinder 30 from the oil inlet channel 32. After the pressure chamber 31 is filled with the hydraulic oil, the hydraulic oil enters the second hydraulic cylinder 40 from the oil outlet channel 33; (2) after the hydraulic oil fills the second hydraulic cylinder 40, the pressure of the hydraulic oil is applied to the target force value. At this time, the liquid pressures in the first hydraulic cylinder 30 and the second hydraulic cylinder 40 are consistent; (3) the control valve returns to the middle cut-off state and stops supplying oil; (4) the electromagnetic resonance generator 10 is started to generate controllable frequency vibration. The electromagnetic resonance generator 10 drives the piston 21 to vibrate at a corresponding frequency in the first hydraulic cylinder 30; (5) Since the cross-sections of the first hydraulic cylinder 30 and the second hydraulic cylinder 40 are in a certain ratio, namely, the cylinder diameter ratio, according to Pascal's principle, the force amplitude of the hydraulic oil in the second hydraulic cylinder 40 will be proportionally amplified according to the cylinder diameter ratio, thereby reducing the power consumption of the traditional high-frequency fatigue equipment while keeping the working frequency of the hydraulic oil in the second hydraulic cylinder 40 consistent, and correspondingly reducing the volume of the electromagnetic resonance generator 10. At the same time, high-frequency vibration with ultra-large force can be achieved through the amplification principle.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high frequency fatigue actuation device, characterized in that: include: An electromagnetic resonance generator (10), a piston assembly (20), a first hydraulic cylinder (30), and a second hydraulic cylinder (40); the piston assembly (20) comprises a piston (21) and a connecting rod (22); the piston (21) is disposed in the first hydraulic cylinder (30) and is slidably matched with the inner side wall of the first hydraulic cylinder (30); a pressure chamber (31) is formed between the piston (21) and the side wall and top wall of the first hydraulic cylinder (30); the top end of the connecting rod (22) is connected to the piston (21), and the bottom end of the connecting rod (22) passes through the bottom side of the first hydraulic cylinder (30) and is connected to the electromagnetic resonance generator (10); the first hydraulic cylinder (30) is provided with an oil inlet channel (32) and an oil outlet channel (33) respectively connected to the pressure chamber (31), and the oil outlet channel (33) is also connected to the second hydraulic cylinder (40) through a pipeline; A bracket (60) is provided on the top of the electromagnetic resonance generator (10), and the first hydraulic cylinder (30) is mounted on the bracket (60); The oil inlet passage (32) is transversely arranged on the bottom side of the first hydraulic cylinder (30); the piston assembly (20) is provided with a delivery passage, and both ends of the delivery passage are respectively connected to the pressure chamber (31) and the oil inlet passage (32); The delivery channel comprises a first oil hole (231) located in the connecting rod (22) and a second oil hole (232) penetrating the piston (21); two openings of the first oil hole (231) are respectively located on the side wall and the top wall of the connecting rod (22), and the first oil hole (231) is respectively connected to the second oil hole (232) and the oil inlet channel (32); An oil ring groove (24) is provided on the side wall of the connecting rod (22), and the opening of the first oil hole (231) located on the side wall of the connecting rod (22) is located in the oil ring groove (24); a lubrication ring groove (34) is provided at a position where the first hydraulic cylinder (30) contacts the connecting rod (22), the oil ring groove (24) is located in the lubrication ring groove (34), and the width of the lubrication ring groove (34) is greater than the width of the oil ring groove (24); The diameter of the first hydraulic cylinder (30) is smaller than the diameter of the second hydraulic cylinder (40).

2. The high-frequency fatigue actuation device according to claim 1, characterized in that: A first sealing ring (50) and a second sealing ring (51) are also provided at the position where the first hydraulic cylinder (30) contacts the connecting rod (22), and the lubricating ring groove (34) is located between the first sealing ring (50) and the second sealing ring (51).

3. The high-frequency fatigue actuation device according to claim 2, characterized in that: A third sealing ring (52) is provided between the top wall of the connecting rod (22) and the piston (21), and the third sealing ring (52) is arranged around the first oil hole (231).

4. The high-frequency fatigue actuation device according to claim 3, characterized in that: The connecting rod (22) extends into the piston (21) and is threadedly connected to the piston (21); the connecting rod (22) is also connected to a nut (25), and the nut (25) is in contact with the piston (21).

5. The high frequency fatigue actuation device according to claim 4, characterized in that: The first hydraulic cylinder (30) comprises a cylinder body (35) and an upper end cover (36) and a lower end cover (37) respectively arranged at both ends of the cylinder body (35); an oil overflow port (38) is provided on the bottom side wall of the cylinder body (35); and the oil inlet channel (32) and the oil outlet channel (33) are respectively arranged on the lower end cover (37) and the upper end cover (36).

6. The high frequency fatigue actuation device according to claim 5, characterized in that: The oil inlet passage (32) is connected to a control valve via a pipeline.

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