CN117249198A

CN117249198A - Vibration isolation device

Info

Publication number: CN117249198A
Application number: CN202311523691.9A
Authority: CN
Inventors: 易炬; 卢明辉; 谢海圣; 王珏; 刘畅; 谭鑫; 徐秋玲; 陆晨怡
Original assignee: Suzhou Acoustic Industrial Technology Research Institute Co ltd
Current assignee: Suzhou Acoustic Industrial Technology Research Institute Co ltd
Priority date: 2023-11-16
Filing date: 2023-11-16
Publication date: 2023-12-19
Anticipated expiration: 2043-11-16
Also published as: CN117249198B

Abstract

The invention relates to a vibration isolation device, which comprises a base and a platform arranged above the base, wherein the platform is connected with the base through a spring so as to isolate vibration between the platform and the base, the edge of the platform extends to the base to form a side plate, at least two pinch rollers which are different in position and used for limiting the transverse shaking of the platform are arranged on the outer side of the side plate, the pinch rollers are tightly adhered to the side plate and can rotate along with the movement of the side plate relative to the base, the pinch rollers are arranged on a connecting plate, the connecting plate is connected to a vertical plate through bolts, the vertical plate is connected to the base, a vibration isolation pad I is inserted between the connecting plate and the vertical plate, and the vibration isolation pad I is provided with a slot sleeved on a bolt so as to be convenient for replacing the vibration isolation pad I with different thicknesses. The pinch roller is tightly pressed on the side plate, so that the lateral displacement of the side plate can be more strictly limited, and the lateral displacement of the platform is limited.

Description

Vibration isolation device

Technical Field

The invention relates to a vibration isolation device, which is used for reducing the propagation of solid sound caused by equipment vibration.

Background

The metal spring vibration isolator is widely applied to vibration isolation of various pumps, pipelines, motors, fans, cooling towers, die cutting machines, punching machines and other devices, and is used for reducing solid sound propagation caused by device vibration in the running process of the devices.

The existing metal spring vibration isolator mainly plays a vibration isolating role in the axial direction (herein defined as Z direction) of a metal spring, and the vertical plane (herein defined as XY plane) of the axial direction of the metal spring completely depends on the rigidity reducing equipment of the metal spring and the vibration isolating system to shake on the XY plane, namely lateral displacement. The larger the rigidity of the metal spring is, the smaller the lateral displacement of the vibration isolation device and the vibration isolation system swaying on the XY plane is. However, too much stiffness of the metal spring may result in a decrease in vibration isolation efficiency of the vibration isolation system.

In some application scenes, such as vibration isolation of a die cutting machine, after vibration isolation treatment is carried out on the die cutting machine by using the existing metal spring vibration isolator, the size deviation of die-cut products is increased due to shaking of equipment on an XY surface, and the service life of a die used in die cutting operation is shortened. This is where the performance of existing metal spring isolators needs to be improved.

For the vibration of the XY plane, there are the air-floating vibration isolation unit 400, the active damping unit 500, and the limiting unit 600 disclosed in the chinese patent document "CN115217890a", which are known to affect the levelness of the vibration isolation platform 200, because the air-floating vibration isolation unit 400 and the active damping unit 500 on the sides absorb the horizontal displacement of the vibration isolation platform 200 by their own expansion and contraction, the expansion and contraction amounts of the air-floating vibration isolation unit 400 and the active damping unit 500 are large, thereby affecting the levelness of the vibration isolation platform 200. The chinese patent document "CN115727095a" restricts the horizontal displacement of the upper mount 1 by the damping action between the damping sheet 41 and the damping packing 42, but the friction force between the damping sheet 41 and the damping packing 42 is limited, and the horizontal displacement of the upper mount 1 cannot be restricted to a large extent. Other chinese patent documents such as "CN217440676U", "CN213877286U", "CN216555143U", "CN213979398U", "CN215763012U", "CN217271630U", "CN219580616U" and "CN208719252U" are almost all abutted against by springs at the sides to limit the horizontal displacement of the platform, but the deformation of the springs is still large, and vibration isolation of some occasions where the horizontal displacement needs to be strictly limited, such as a die cutting machine, is not applicable.

Disclosure of Invention

The invention aims to provide a vibration isolation device, which solves the problem of how to more strictly limit the transverse displacement (or horizontal displacement and XY plane displacement) of a platform.

In order to achieve the above purpose, the invention adopts the following technical scheme:

the invention provides a vibration isolation device, which comprises a base and a platform arranged above the base, wherein the platform is connected with the base through a spring so as to isolate vibration between the platform and the base, the edge of the platform extends towards the base to form a side plate, at least two pinch rollers which are different in position and used for limiting the platform to transversely shake are arranged on the outer side of the side plate, the pinch rollers are tightly attached to the side plate and can rotate along with the movement of the side plate relative to the base, the pinch rollers are arranged on a connecting plate, the connecting plate is connected with a vertical plate through a bolt, the vertical plate is connected with the base, a vibration isolation pad I is further inserted between the connecting plate and the vertical plate, and the vibration isolation pad I is provided with a slot sleeved on the bolt so as to be convenient for replacing the vibration isolation pad I with different thicknesses.

Preferably, a spring cover is arranged on one side of the platform facing the base, a plane is arranged in the spring cover, planes are arranged at two ends of the spring, one end of the spring is inserted into the spring cover, the plane of the end of the spring is attached to the plane in the spring cover, the spring cover is connected with the platform through a screw rod and a nut, a vibration isolation pad II is arranged on the base, a groove is formed in the vibration isolation pad II, and the other end of the spring is embedded in the groove.

Preferably, the vibration isolation pad I is a rubber block or a structure in which the rubber block and the steel sheet are alternately overlapped.

Preferably, the connecting plate is provided with two, and is single the connecting plate includes riser installation department and pinch roller installation department, two wear to be equipped with the shaft between the pinch roller installation department, the pinch roller is located two between the pinch roller installation department and the cover is established on the shaft, the both ends of shaft pass the pinch roller installation department and expose in the pinch roller installation department outside, the shaft expose in the outer end spiro union in pinch roller installation department outside has fastening nut I.

Further, a collar for limiting the movement of the pressing wheel is arranged between the pressing wheel mounting portions on two sides of the pressing wheel, the collar is sleeved on the wheel shaft, and an opening is further formed in the vertical plate, corresponding to the area between the two pressing wheel mounting portions.

Preferably, the base comprises a base plate and a vibration isolator III arranged on the lower surface of the base plate, and the platform comprises a cover plate and a vibration isolator IV arranged on the upper surface of the cover plate.

Preferably, the device further comprises an axial limiting assembly, the axial limiting assembly comprises a vertical rod arranged on the base, an upper limiting piece and a lower limiting piece arranged on the vertical rod, threads are arranged on the periphery of the vertical rod, the upper limiting piece is fixed on the vertical rod through a fastening nut II above and below the upper limiting piece, an extending plate is connected to the side plate, and the extending plate penetrates through the periphery of the vertical rod and is in non-contact with the vertical rod.

Further, the positions of the upper limiting piece and the lower limiting piece on the vertical rod are adjustable, and the position of the upper limiting piece can be adjusted to enable the spring to be precompressed.

Further, the upper surface of the extension plate is provided with a vibration isolation pad V, the vibration isolation pad V is further provided with an annular hole surrounding the periphery of the vertical rod, the annular hole is enough to accommodate a fastening nut II used for fixing the upper limit plate, and the upper surface of the lower limit plate is provided with a vibration isolation pad VI.

Further, the base comprises a base plate and a vibration isolation pad arranged on the lower surface of the base plate, a counter bore is formed in the lower surface of the base plate, a bolt is arranged at the lower end of the vertical rod, and the bolt head is embedded in the counter bore.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

according to the vibration isolation device, the pressing wheels are arranged on the side plates and pressed on the side plates, so that transverse displacement of the side plates can be more strictly limited, transverse displacement of the platform is limited, and displacement of the platform in the vertical direction is not particularly influenced.

Drawings

Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:

FIG. 1 is a perspective view of embodiment 1 of the present invention;

FIG. 2 is a cross-sectional view, A-A, of FIG. 1, shown in perspective;

FIG. 3 is a schematic perspective view of the lateral stop assembly of FIG. 1;

FIG. 4 is an exploded view of the lateral stop assembly of FIG. 3;

FIG. 5 is a cross-sectional view B-B of FIG. 1;

FIG. 6 is an enlarged view at C of FIG. 5;

FIG. 7 is a top view of FIG. 1;

FIG. 8 is a top view of example 2, corresponding to FIG. 7;

FIG. 9 is a top view of example 3, corresponding to FIG. 7;

wherein reference numerals are as follows:

1. a base; 11. a substrate; 111. countersink; 12. vibration isolator III; 2. a platform; 21. a cover plate; 22. vibration isolation pad IV; 3. a side plate; 31. a clamping groove; 4. an axial vibration isolation assembly; 41. a spring; 42. a spring cover; 421. a top plate; 422. a side limiting plate; 43. a screw; 44. a nut; 45. vibration isolation pad II; 451. a groove; 46. a gasket; 47. coaming plate; 5. a lateral limit assembly; 51. a pinch roller; 52. a connecting plate; 521. a vertical plate mounting part; 522. a pinch roller mounting portion; 53. a bolt; 54. a vertical plate; 541. an opening; 542. a support plate; 55. vibration isolation pad I; 551. a slot; 56. a wheel axle; 57. a fastening nut I; 58. a collar; 59. a spring washer; 510. a small gasket; 511. a fastening nut III; 6. an axial limit assembly; 61. a vertical rod; 611. a bolt head; 62. an upper limit piece; 63. a lower limit piece; 64. a fastening nut II; 65. an extension plate; 66. a vibration isolator V; 661. an annular hole; 67. vibration isolator VI; 68. fastening a nut IV; 69. and (5) fastening the nut V.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.

Example 1

The vibration isolation device shown in fig. 1 mainly comprises a base 1, a platform 2, side plates 3, an axial vibration isolation assembly 4 (see fig. 2), a lateral limiting assembly 5 and an axial limiting assembly 6.

Wherein the platform 2 is vibration isolated with respect to the base 1, i.e. the vibrations of the platform 2 are not transmitted to the base 1, so that physical vibrations of the equipment mounted on the platform 2 do not cause the propagation of solid-state sound.

As shown in fig. 2, vibration isolation is performed between the platform 2 and the base 1 through an axial vibration isolation assembly 4.

The axial vibration isolation assembly 4 mainly includes a spring 41. Vibration isolation is mainly achieved between the platform 2 and the base 1 by means of springs 41.

Be provided with bounding wall 47 on the base 1, the space that encloses in the bounding wall 47 is provided with spring 41, and the bottom in bounding wall 47 inner periphery closes the space is provided with isolator II 45, and isolator II 45 top surface has seted up recess 451, and spring 41 lower extreme inlays and is established by spacing in recess 451, and the upper and lower end of spring 41 all has the plane, and spring 41 lower extreme is plane fit with the bottom surface of recess 451. The shroud 47 protects the springs 41 on the one hand and stabilizes the vibration isolator ii 45 on the other hand.

The screw 43 is fixed to the platform 2 by a nut 44 and a washer 46. A spring cover 42 is fixed to the lower portion of the screw 43 by two other nuts 44. The spring cover 42 includes a top plate 421 and a lateral limiting plate 422 extending downward from an outer edge of the top plate 421. An accommodating space is formed by enclosing the inner side of the side limiting plate 422 and the lower part of the top plate 421, and the accommodating space is used for embedding the upper end of the spring 41. The upper end of the spring 41 has a plane, and is matched with the lower surface of the top plate 421 in a plane, so that the spring has a stabilizing effect. The side stopper 422 can restrict the spring 41 from moving sideways.

The platform 2 includes a cover plate 21 and vibration isolators iv 22. The cover plate 21 is made of stainless steel or cast iron. The vibration isolator iv 22 is a rubber vibration isolator. The outer edge of the cover plate 21 extends vertically downwards to form a side plate 3. The side plate 3 and the cover plate 21 are integrally formed or welded. The side plates 3 can hide the inner axial vibration isolation assembly 4, and can play an attractive role.

As shown in fig. 1 and 7, four sets of lateral limiting assemblies 5 are arranged on the outer side of the side plate 3, and the number of the lateral limiting assemblies 5 is not limited.

The lateral stop assembly 5 mainly limits the horizontal movement of the platform 2.

As shown in fig. 3, the lateral limiting assembly 5 mainly comprises a pressing wheel 51, and the pressing wheel 51 abuts against the outer surface of the side plate 3. And the rotation axis of the pinch roller 51 is in a horizontal direction, so that the pinch roller 51 can rotate by static friction force when the side plate 3 moves up and down, and the up and down movement of the side plate 3 is not affected.

Since the pinch roller 51 is tightly abutted against the side plate 3, the horizontal displacement of the platform 2 can be restricted more strictly.

As shown in fig. 3 and 4, the pinch roller 51 is mounted on the connection plates 52 on both sides by the wheel shaft 56, and each connection plate 52 includes a riser mounting portion 521 and a pinch roller mounting portion 522. The riser mounting portion 521 is for connecting to the riser 54, and the pinch roller mounting portion 522 is for mounting the axle 56. The two ends of the wheel axle 56 pass through the pinch roller mounting part 522, and the two ends of the wheel axle 56 are connected with the fastening nuts I57 in a threaded manner. Pinch roller 51 is sleeved on axle 56 between pinch roller mounting portions 522 on both sides. The gap between puck 51 and axle 56 is small so that the position of puck 51 is relatively fixed. And bearings may also be provided between puck 51 and axle 56.

The space between the two sides of the pinch roller 51 and the pinch roller mounting portion 522 is also provided with a collar 58, the collar 58 is sleeved on the axle 56, and the collar 58 is used for limiting the axial movement of the pinch roller 51 on the axle 56.

The riser mounting portion 521 is mounted on the riser 54 by the bolt 53, the spring washer 59, the small washer 510, and the fastening nut iii 511. The bolt head of the bolt 53, the spring washer 59, and the small washer 510 are located on the side of the riser mount 521 facing away from the counter plate 54, and the fastening nut iii 511 is located on the side of the riser 54 facing away from the counter plate mount 521. A vibration isolator i 55 is further provided between the riser mounting portion 521 and the riser 54. Vibration isolator i 55 has a slot 551. The slot 551 is located the isolator I55 below, and the slot 551 cover is established in the bolt 53 outside. Thus, the vibration isolation pad I55 with different thickness can be conveniently replaced, and the distance between the pinch roller 51 and the side plate 3 can be adjusted.

The vibration isolator i 55 of this example is a rubber block. Other embodiments can also be a structure in which rubber blocks and steel sheets are alternately overlapped.

The vertical plate 54 is further provided with an opening 541, and a portion of the pressing wheel 51 may be located in the opening 541, so that the overall space occupied by the lateral limiting assembly 5 can be reduced. The openings 541 are configured to accommodate different sized puck 51. And opening 541 also facilitates viewing the operation of puck 51.

The lower end of the vertical plate 54 is further provided with a support plate 542 extending laterally, and the support plate 542 can be welded with the base 1. The support plate 542 improves the bonding strength between the riser 54 and the base 1. In other embodiments, the riser 54 may also be integrally formed (e.g., cast) with the base 1.

As shown in fig. 5 and 6, the present example further includes an axial limiting assembly 6 for limiting the upward and downward travel of the platform 2. The axial stop assemblies 6 may have at least one, in this case four, sets.

The axial limiting assembly 6 mainly comprises a vertical rod 61, an upper limiting piece 62, a lower limiting piece 63 and an extension plate 65. The upright 61 is mounted on the base 1. The upper limit piece 62 and the lower limit piece 63 are arranged on the vertical rod 61. The space between the upper limit plate 62 and the lower limit plate 63 is provided with an extension plate 65, and the extension plate 65 is integrated with or connected with the side plate 3. The extension plate 65 is sleeved on the periphery of the upright 61, and the maximum distance between the upper and lower sides of the extension plate 65 is limited by the blocking of the upper limiting piece 62 and the lower limiting piece 63. However, the extension plate 65 is not in contact with the upright 61, so that the vibrations of the extension plate 65 are isolated from the upright 61 and do not transfer vibrations to the base 1, which is a structural feature that greatly reduces the transfer of vibration energy to the surrounding environment compared to prior art isolators. It is also due to the presence of the lateral limiting assembly 5 that the uprights 61 are not in contact with the extension plate 65.

In order to reduce the noise generated by collision during blocking, the upper surface of the extension plate 65 is provided with a vibration isolation pad V66, and the middle part of the vibration isolation pad V66 is embedded downwards into an opening in the middle part of the extension plate 65. The vibration isolator v 66 also has an opening in the middle thereof formed as an annular ring 661 surrounding the upright 61 such that the vibration isolator v 66 is not in contact with the upright 61. And the annular hole 661 is large enough to accommodate the fastening nut ii 64 above for securing the upper limit plate 62 to the upright 61. Two fastening nuts II 64 fasten the upper limit plate 62 on the upright 61 from top to bottom, respectively. Vibration isolator v 66 rides on extension plate 65 without the need for additional fasteners.

A vibration isolator vi 67 for buffering collision with the extension plate 65 is placed on the upper surface of the lower limit plate 63. And the lower limit plate 63 is supported by only one fastening nut IV 68 below.

As shown in fig. 6, the base 1 includes a base plate 11 and vibration insulators iii 12 on the lower surface of the base plate 11. The lower surface of the base plate 11 is also provided with a counterbore 111. The lower end of the upright rod 61 is provided with a bolt head 611, the bolt head 611 is embedded in the counter bore 111, the lower surface of the bolt head 611 is basically level with the lower surface of the base plate 11, and the lower part of the bolt head 611 is covered by the vibration isolation pad III 12. On the upright 61, a fastening nut v 69 is screwed to the upper surface of the base plate 11, and the fastening nut v 69 is engaged with the bolt head 611 to fix the upright 61 to the base plate 11.

The positions of the upper limit plate 62 and the lower limit plate 63 on the upright rod 61 are adjustable, and the position of the upper limit plate 62 can be adjusted to enable the spring 41 to be precompressed, so that the vibration isolation device is more convenient to install.

All the vibration isolation pads can be made of rubber materials.

Example 2

Referring to fig. 8, compared with fig. 7, fig. 7 is a top view of fig. 1, and as can be seen from fig. 8, the platform 2 is circular, and the lateral limiting assemblies 5 may be not limited to four, for example, three, that is, only three pressing wheels 51 are required to press against the side plates 3 at the outer edge of the platform 2, so that the platform 2 can be effectively prevented from moving in any direction on the horizontal plane.

Example 3

In fig. 9, in contrast to fig. 7, the platform 2 is irregularly shaped, and the side plate 3 has two recesses, namely two clamping grooves 31, and the pressing wheel 51 just presses on the clamping grooves 31 on the side plate 3. At this time, the movement of the platform 2 in any direction on the horizontal plane can be well restricted by the two pressing wheels 51.

In summary, the lateral limiting component 5 of the present embodiment actively controls XY displacement of the vibration isolation device and vibration isolation system, and improves precision of the machined parts after vibration isolation and noise reduction measures are implemented and service life of the punching die when the lateral limiting component is used in devices such as a die cutting machine and a punching machine.

The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a vibration isolation device, it includes base (1) and sets up platform (2) in base (1) top, thereby connect through spring (41) between platform (2) with base (1) thereby make between platform (2) for vibration isolation between base (1), its characterized in that: the edge of platform (2) is to base (1) extends and forms curb plate (3), the outside of curb plate (3) is provided with two at least positions different and is used for limiting pinch roller (51) that platform (2) transversely rocked, pinch roller (51) paste tightly in curb plate (3) and can follow curb plate (3) for base (1) removal and rotatory, pinch roller (51) set up on connecting plate (52), just connecting plate (52) are connected on riser (54) through bolt (53), riser (54) are connected on base (1), connecting plate (52) with still insert between riser (54) and be equipped with vibration isolator I (55), vibration isolator I (55) have the cover establish slot (551) on bolt (53) in order to be convenient for change vibration isolator I (55) of different thickness.

2. The vibration isolation device according to claim 1, wherein: the utility model discloses a vibration isolator, including base (1), base (2), spring cover (42) are provided with one side of base (1), have the plane in spring cover (42), the both ends of spring (41) all have the plane, one tip of spring (41) is inserted and is established in spring cover (42) just the plane of spring (41) tip with the plane in spring cover (42) is pasted mutually, spring cover (42) with be connected through screw rod (43) and nut (44) between platform (2), be provided with vibration isolator II (45) on base (1), set up recess (451) in vibration isolator II (45), the other end of spring (41) is inlayed and is established in recess (451).

3. The vibration isolation device according to claim 1, wherein: the vibration isolation pad I (55) is a rubber block or a structure of alternately superposing the rubber block and the steel sheet.

4. The vibration isolation device according to claim 1, wherein: the connecting plates (52) are arranged in two, each connecting plate (52) comprises a vertical plate mounting part (521) and a pressing wheel mounting part (522), an axle (56) is arranged between the two pressing wheel mounting parts (522) in a penetrating mode, the pressing wheels (51) are arranged between the two pressing wheel mounting parts (522) and are sleeved on the axle (56), two ends of the axle (56) penetrate through the pressing wheel mounting parts (522) and are exposed out of the outer sides of the pressing wheel mounting parts (522), and the outer ends of the axle (56) exposed out of the pressing wheel mounting parts (522) are connected with fastening nuts I (57) in a threaded mode.

5. The vibration isolation apparatus of claim 4, wherein: collar (58) used for limiting the movement of the pressing wheel (51) are arranged between the pressing wheel (51) and the pressing wheel mounting portions (522) on two sides, the collar (58) is sleeved on the wheel shaft (56), and an opening (541) is formed in the vertical plate (54) corresponding to the area between the two pressing wheel mounting portions (522).

6. The vibration isolation device according to claim 1, wherein: the base (1) comprises a base plate (11) and a vibration isolation pad III (12) arranged on the lower surface of the base plate (11), and the platform (2) comprises a cover plate (21) and a vibration isolation pad IV (22) arranged on the upper surface of the cover plate (21).

7. The vibration isolation device according to claim 1, wherein: it still includes axial spacing subassembly (6), axial spacing subassembly (6) are in including setting up pole setting (61) on base (1), set up last spacing piece (62) and lower spacing piece (63) on pole setting (61), pole setting (61) periphery is provided with the screw thread, go up spacing piece (62) and fix through fastening nut II (64) of its top and below pole setting (61), be connected with extension board (65) on curb plate (3), extension board (65) wear to establish pole setting (61) periphery and with pole setting (61) contactless.

8. The vibration isolation apparatus of claim 7, wherein: the positions of the upper limit plate (62) and the lower limit plate (63) on the vertical rod (61) are adjustable, and the position of the upper limit plate (62) can be adjusted to enable the spring (41) to be precompressed.

9. The vibration isolation apparatus of claim 7, wherein: the vibration isolator is characterized in that a vibration isolator V (66) is arranged on the upper surface of the extension plate (65), an annular hole (661) surrounding the periphery of the vertical rod (61) is further formed in the vibration isolator V (66), the annular hole (661) is enough to accommodate a fastening nut II (64) used for fixing the upper limiting piece (62), and a vibration isolator VI (67) is arranged on the upper surface of the lower limiting piece (63).

10. The vibration isolation apparatus of claim 7, wherein: the base (1) comprises a base plate (11) and a vibration isolation pad III (12) arranged on the lower surface of the base plate (11), a counter bore (111) is formed in the lower surface of the base plate (11), a bolt head (611) is arranged at the lower end of the vertical rod (61), and the bolt head (611) is embedded in the counter bore (111).