Active vibration isolation device

Abstract

An active vibration isolation device comprises a hydraulic control station, the hydraulic control station is connected with at least one vibration isolation unit, the hydraulic control station provides a high-pressure oil source with the highest pressure of 21 MPa and the adjustable pressure flow of 40 L / min for a vibration test, the output oil pressure of the high-pressure oil source can be stabilized, the oil supply flow is supplemented, and high-pressure oil supply with the highest pressure of 250 L / min is achieved in a short time. Each vibration isolation unit comprises an outer frame body, the outer frame body is of a rectangular structure, each edge of the rectangular structure formed by the outer frame body is provided with at least three hydraulic drivers, the three hydraulic drivers are distributed in three directions, specifically, one direction is the vertical direction, the other two are the horizontal direction, and linear vibration can be conducted; meanwhile, each hydraulic driver has the capacity of three-axis adjustment, such as pitching rotation, rolling rotation and azimuth rotation, so that angular vibration is achieved, in addition, the three hydraulic drivers have the capacity of the vibration isolation frequency band ranging from 10 Hz to 200 Hz, and the vibration isolation stroke is + / -20 mm.

Description

Technical Field

[0001] The utility model relates to the technical field of testing, in particular to an active vibration isolation device. Background Art

[0002] Vibration resistance test is a test operation that most mechanical equipment needs to undergo after processing. However, the vibration resistance test device currently used has a poor effect of isolating vibration. It is easy to cause the test device to vibrate when vibrating, thus affecting the test results. At the same time, it is also impossible to accurately control the vibration frequency and vibration amplitude. Utility Model Content

[0003] The utility model provides an active vibration isolation device to solve the above-mentioned deficiencies in the prior art, improves the vibration isolation effect and has strong practicability.

[0004] In order to achieve the purpose of this utility model, the following technologies are proposed:

[0005] An active vibration isolation device includes a hydraulic control station, which is connected to at least one vibration isolation unit. The hydraulic control station provides a high-pressure oil source with a maximum pressure and flow rate of 21MPa and 40L / min for vibration testing, and can also stabilize the output oil pressure of the high-pressure oil source and supplement the oil supply flow rate, thereby achieving a high-pressure oil supply of up to 250L / min in a short time.

[0006] The vibration isolation unit includes an outer frame, which has a rectangular structure, and at least three hydraulic drivers are respectively arranged on each edge of the rectangular structure formed by the outer frame. The three hydraulic drivers are distributed in three directions, one of which is a vertical direction, and the other two are horizontal directions, and can perform linear vibration. At the same time, each hydraulic driver has the ability of three-axis adjustment, such as pitch rotation, roll rotation, and azimuth rotation to achieve angular vibration. In addition, the three hydraulic drivers have the ability to isolate the frequency band of 10Hz to 200Hz, and the vibration isolation stroke is ±20mm.

[0007] An inner frame is arranged inside the outer frame, the inner frame is in a rectangular structure, the inner side end of the hydraulic driver is arranged on the edge of the rectangular structure formed by the inner frame, and the test workpiece is placed in the inner frame. The above four sets of hydraulic drivers can perform multi-dimensional vibration test operations on the test workpiece.

[0008] The hydraulic driver includes an upper seat body mounted on each edge of the outer frame, a connecting rod is provided on the upper seat body, a first end ball is provided on the inner end of the connecting rod, a first ball sleeve is sleeved on the first end ball, a hydraulic cylinder is provided on the other end of the first ball sleeve, and a controller and a speed sensor for controlling the amount of movement of the movable rod thereon are provided on the hydraulic cylinder, as well as a sensor for feedback of the movement distance, etc. The hydraulic cylinder is connected to the hydraulic control station, a first end cover is installed on the end of the movable rod of the hydraulic cylinder by screws, a first spring is sleeved on the inner side of the first end cover, the first spring is sleeved on the movable rod of the hydraulic cylinder, a middle septum ring is provided on the other end of the first spring, a sleeve is provided on the outer periphery of the middle septum ring, a second spring is provided on the other side of the middle septum ring, the second spring is sleeved on the movable rod of the hydraulic cylinder, the first end cover is movably provided on one end of the sleeve, a second end cover is also installed on the movable rod of the hydraulic cylinder, the second end cover is movably provided on the other end of the sleeve, and the second spring is located on the inner side of the second end cover, and the end of the sleeve A third end cover is installed, a second connecting rod is installed on the third end cover, a second ball sleeve is provided at the other end of the second connecting rod, a second ball is rotatably provided in the second ball sleeve, a third connecting rod is provided on the second ball, an inner connecting seat is installed on the third connecting rod, and the inner connecting seat is installed on the edge of the rectangular structure formed by the inner frame. Through the arrangement of the first spring and the second spring, when the hydraulic driver drives the inner frame to move, the inner frame transfers the motion to the hydraulic driver, which plays a damping role, thereby avoiding the outer frame from vibrating during the test, thereby improving the stability during the test.

[0009] Furthermore, the outer frame includes an upper frame and a lower frame, and a plurality of vertical rods are provided between the upper frame and the lower frame to ensure safety during the test.

[0010] Furthermore, a plurality of lower mounting plates are provided inside the lower frame for mounting and fixing the outer frame.

[0011] Furthermore, a plurality of reinforcing rods are provided inside the upper frame to improve the structural strength of the outer frame.

[0012] Furthermore, the upper frame is provided with a plurality of external lifting rings for transfer operations.

[0013] Furthermore, the inner frame includes an upper frame and a lower frame, and a plurality of vertical rods are provided between the upper frame and the lower frame to facilitate fixing of the workpiece.

[0014] Furthermore, the upper frame is provided with a plurality of inner lifting rings to facilitate the transfer of the inner frame.

[0015] Furthermore, rubber washers are provided on both sides of the middle septum ring, and the rubber washers are located at the inner ends of the second spring and the first spring, which improves the vibration isolation effect. Specifically, within a certain displacement range, the ratio of the load change to the displacement change of the rubber washer is different, and the static stiffness values ​​obtained in different displacement ranges are different, while the ratio of the load change to the displacement change of the metal spring within any displacement range is constant. After the metal spring and the shock-absorbing rubber are compressed to the limit at the same time, the pressure of the metal spring will remain unchanged, while the pressure of the shock-absorbing rubber will relax over time. This pressure relaxation characteristic of the shock-absorbing rubber makes it have a better vibration reduction effect than the metal spring.

[0016] Furthermore, a pair of bosses are provided on the outer circumference of the outer sleeve, screws are installed on the bosses, and an annular groove is provided on the outer circumference of the septum ring. The inner end of the screw is inserted into the annular groove to facilitate the installation and fixation of the septum ring.

[0017] The advantages of the above technical solution are:

[0018] The utility model improves the vibration isolation effect and improves the stability and safety during testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0020] Figure 1 A three-dimensional structural diagram of one embodiment is shown.

[0021] Figure 2 A three-dimensional structural diagram of the vibration isolation unit is shown.

[0022] Figure 3 A three-dimensional structural diagram of a hydraulic drive is shown.

[0023] Figure 4 Shows the cross-sectional structure of the hydraulic actuator Figure 1 .

[0024] Figure 5 Shows the cross-sectional structure of the hydraulic actuator Figure 2 .

[0025] Figure 6 A control flow chart of the active vibration isolation device is shown. DETAILED DESCRIPTION

[0026] like Figure 1 to Figure 6 As shown, an active vibration isolation device includes a hydraulic control station 1 , to which at least one vibration isolation unit 2 is connected.

[0027] The vibration isolation unit 2 includes an outer frame 3, which is a rectangular structure, and three hydraulic drivers 4 are respectively arranged on each edge of the rectangular structure formed by the outer frame 3. An inner frame 6 is arranged inside the outer frame 3, and the inner frame 6 is a rectangular structure. The inner side end of the hydraulic driver 4 is arranged on the edge of the rectangular structure formed by the inner frame 6, and the test workpiece is placed in the inner frame 6.

[0028] The outer frame 3 includes an upper frame 31 and a lower frame 300, and a plurality of vertical rods 30 are arranged between the upper frame 31 and the lower frame 300. A plurality of lower mounting plates 301 are arranged inside the lower frame 300. A plurality of reinforcing rods 34 are arranged inside the upper frame 31. A plurality of external hanging rings 33 are installed on the upper frame 31.

[0029] The hydraulic driver 4 includes an upper seat body 400 installed on each edge of the outer frame 3, and a connecting rod 40 is provided on the upper seat body 400. The inner end of the connecting rod 40 is provided with a first end ball 401, and a first ball sleeve 41 is sleeved on the first end ball 401. The other end of the first ball sleeve 41 is provided with a hydraulic cylinder 42. Generally, the hydraulic driver 4 located in the vertical direction carries a hydraulic cylinder 42, while the two hydraulic drivers 4 located in the horizontal direction do not carry the hydraulic cylinder 42. That is to say, the two hydraulic drivers 4 located in the horizontal direction do not have the ability of automatic driving, but have the ability of passive vibration damping. The hydraulic cylinder 42 is connected to the hydraulic control station 1. The end of the movable rod 43 of the hydraulic cylinder 42 is installed with a first end cover 44 through a screw 45. The inner side of the first end cover 44 is sleeved with a first spring 46. The first spring 46 is sleeved on the movable rod 43 of the hydraulic cylinder 42. The other end of the first spring 46 is provided with a septum ring 50. The outer periphery of the septum ring 50 is provided with a sleeve 49. The other side of the septum ring 50 is provided with a second spring 47. The second spring 47 is sleeved on the movable rod 43 of the hydraulic cylinder 42. The first end cover 44 is movably provided at one end of the sleeve 49. The hydraulic cylinder 42 The movable rod 43 is also provided with a second end cap 48, which is movably arranged at the other end of the outer sleeve 49, and the second spring 47 is located inside the second end cap 48. The end of the outer sleeve 49 is provided with a third end cap 52, and the third end cap 52 is provided with a second connecting rod 53. The other end of the second connecting rod 53 is provided with a second ball sleeve 54, and a second ball is rotatably arranged in the second ball sleeve 54. The second ball is provided with a third connecting rod 55, and the third connecting rod 55 is provided with an inner connecting seat 62, which is installed on the edge of the rectangular structure formed by the inner frame 6. Rubber washers 51 are provided on both sides of the septum ring 50, and the rubber washers 51 are located at the inner side ends of the second spring 47 and the first spring 46. A pair of bosses 56 are provided on the outer periphery of the outer sleeve 49, and a screw 57 is installed on the boss 56. The outer periphery of the septum ring 50 is provided with an annular groove 59, and the inner side end of the screw 57 is inserted into the annular groove 59.

[0030] The inner frame 6 includes an upper frame 600 and a lower frame 610, and a plurality of vertical rods 61 are disposed between the upper frame 600 and the lower frame 610. A plurality of inner hanging rings 60 are disposed on the upper frame 600.

[0031] When performing the test in this embodiment, the operator places the test workpiece in the inner frame 6 and fixes the test workpiece with a plurality of screws. After the fixation is completed, the vibration resistance test is performed.

[0032] During the test, the operator starts the hydraulic control station 1.

[0033] The edited vibration parameters enable the engineering control computer to control the vibration test process. For specific control, see Figure 6 shown.

[0034] During the vibration test, the four hydraulic cylinders 42 located in the vertical direction as the driving source simultaneously cooperate to make the movable rod 43 thereon move linearly according to the instructions sent by the engineering control computer, and will drive the inner frame 6 and the workpiece therein to vibrate during the movement. The vibration of the inner frame 6 will be achieved by the four hydraulic drivers 4 in the horizontal direction that do not carry the hydraulic cylinders 42, and the four hydraulic drivers 4 that do not carry the hydraulic cylinders 42 will rotate and move respectively. The first spring 46 and the second spring 47 arranged thereon will reduce the influence of the vibration of the inner frame 6 on the outer frame 3. In addition, the first spring 46 and the second spring 47 on the hydraulic driver 4 in the vertical direction will reduce the influence of the movement of the inner frame 6 on the cylinder body of the hydraulic cylinder 42, thereby extending the service life of the hydraulic cylinder 42.

[0035] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and their equivalents, the utility model is also intended to include these modifications and variations.

Claims

1. An active vibration isolation device, characterized in that: It comprises a hydraulic control station (1), wherein the hydraulic control station (1) is connected to at least one vibration isolation unit (2); The vibration isolation unit (2) comprises an outer frame (3), the outer frame (3) being in a rectangular structure, and three hydraulic drivers (4) are respectively provided on each edge of the rectangular structure formed by the outer frame (3); An inner frame (6) is arranged inside the outer frame (3); the inner frame (6) is in a rectangular structure; the inner end of the hydraulic driver (4) is arranged on an edge of the rectangular structure formed by the inner frame (6); The test workpiece is placed in the inner frame (6); The hydraulic driver (4) comprises an upper seat body (400) mounted on each edge of the outer frame body (3); a connecting rod (40) is provided on the upper seat body (400); a first end ball (401) is provided at the inner end of the connecting rod (40); a first ball sleeve (41) is sleeved on the first end ball (401); a hydraulic cylinder (42) is provided at the other end of the first ball sleeve (41); the hydraulic cylinder (42) is connected to the hydraulic control station (1); a first end cover (44) is installed at the end of a movable rod (43) of the hydraulic cylinder (42) via a screw (45); a first spring (46) is sleeved on the inner side of the first end cover (44); the first spring (46) is sleeved on the movable rod (43) of the hydraulic cylinder (42); a middle septum ring (50) is provided at the other end of the first spring (46); a jacket (49) is provided on the outer periphery of the middle septum ring (50); a first end cover (44) is provided on the other side of the middle septum ring (50); The second spring (47) is sleeved on the movable rod (43) of the hydraulic cylinder (42); the first end cover (44) is movably mounted on one end of the outer sleeve (49); the movable rod (43) of the hydraulic cylinder (42) is also mounted with a second end cover (48); the second end cover (48) is movably mounted on the other end of the outer sleeve (49); the second spring (47) is located on the inner side of the second end cover (48); the end of the outer sleeve (49) is mounted with a third end cover (52); the third end cover (52) is mounted with a second connecting rod (53); the other end of the second connecting rod (53) is provided with a second ball sleeve (54); a second ball is rotatably mounted in the second ball sleeve (54); the second ball is provided with a third connecting rod (55); the third connecting rod (55) is mounted with an inner connecting seat (62); the inner connecting seat (62) is mounted on the edge of the rectangular structure formed by the inner frame (6).

2. The active vibration isolation device according to claim 1, characterized in that: The outer frame (3) comprises an upper frame (31) and a lower frame (300), and a plurality of vertical rods (30) are provided between the upper frame (31) and the lower frame (300).

3. The active vibration isolation device according to claim 2, characterized in that: A plurality of lower mounting plates (301) are arranged inside the lower frame (300).

4. The active vibration isolation device according to claim 2, characterized in that: A plurality of reinforcing rods (34) are arranged inside the upper frame (31).

5. The active vibration isolation device according to claim 2, characterized in that: A plurality of external lifting rings (33) are mounted on the upper frame (31).

6. The active vibration isolation device according to claim 1, characterized in that: The inner frame (6) comprises an upper frame (600) and a lower frame (610), and a plurality of vertical rods (61) are provided between the upper frame (600) and the lower frame (610).

7. The active vibration isolation device according to claim 1, characterized in that: A plurality of inner lifting rings (60) are provided on the upper frame (600).

8. The active vibration isolation device according to claim 1, characterized in that: Rubber washers (51) are respectively provided on both sides of the middle septum ring (50), and the rubber washers (51) are located at the inner ends of the second spring (47) and the first spring (46).

9. The active vibration isolation device according to claim 1, characterized in that: A pair of bosses (56) are provided on the outer circumference of the outer sleeve (49), a screw rod (57) is mounted on the bosses (56), an annular groove (59) is provided on the outer circumference of the middle septum ring (50), and the inner end of the screw rod (57) is inserted into the annular groove (59).

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