Polyurethane vibration isolator of vibration centrifuge

Abstract

The polyurethane vibration isolator is characterized in that a vibration table is arranged in an end cavity of a large arm of the vibration centrifuge and comprises a table body and a moving coil, and the moving coil can drive the table body to vibrate; when the vibrating centrifugal machine works, the vibrating centrifugal machine big arm horizontally rotates along the axis of the vibrating centrifugal machine, one end of the table body under the action of centrifugal force can make contact with the inner end face of the vibrating centrifugal machine big arm, and vibration is transmitted to the vibrating centrifugal machine big arm. The vibration isolator is of a laminated structure formed by vulcanizing and bonding a metal top plate, a metal bottom plate and a metal partition plate through an elastic body, the vibration isolator is arranged between the end face of one end of the table body and the inner end face of a large arm of the vibration centrifugal machine, the vibration isolator is in a circular ring shape, installation holes are formed in the circumferential direction of the vibration isolator, and the vibration isolator is installed on the end face of the table body through bolts via the installation holes. The vibration isolator is arranged between the end part of the large arm of the vibrating centrifuge and one end of the table body of the vibrating table, so that the vibrating table is separated from the large arm of the vibrating centrifuge, and the vibration influence on the machine body of the centrifuge is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of vibration isolation of vibrating centrifuges, in particular to a polyurethane vibration isolator for vibrating centrifuges. Background Art

[0002] like Figure 1 As shown, the arm 1 of the vibrating centrifuge is in a horizontal position, and the vibrating table 3 is installed in the distal cavity of the arm 1 of the vibrating centrifuge. The vibrating table 3 includes a moving coil 31 and a table body 32, and the moving coil 31 is arranged in the table body 32. When the system is working, the vibrating centrifuge rotates, the moving coil 31 drives the table body 32 to vibrate, and the arm 1 of the vibrating centrifuge rotates around the vertical axis of the vibrating centrifuge. At this time, the vibrating table 3 is subjected to the action of the centrifugal force F and moves toward the end of the arm 1 of the vibrating centrifuge, so that one end of the table body 32 is pressed on the inner end surface of the arm 1 of the vibrating centrifuge. At this time, the table body 32 will transmit the vibration force to the arm 1 of the vibrating centrifuge, so that the vibrating centrifuge body vibrates as a whole. The long-term vibration of the vibrating centrifuge will cause the components of the vibrating centrifuge (such as bearings, seals, bolts, etc.) to loosen or be damaged, thereby affecting the normal operation of the equipment. In severe cases, it may even cause the equipment to be scrapped, causing huge economic losses to the enterprise. It may also affect the stability of the equipment, cause safety accidents, reduce production efficiency, and other hazards. Therefore, the vibration problem of the vibrating centrifuge should be highly valued and effective measures should be taken to solve it.

[0003] Through searching, no patents or documents related to the present invention have been found.

[0004] In summary, how to design a polyurethane vibration isolator for a vibrating centrifuge that can isolate the vibration table from the main arm of the vibrating centrifuge to reduce the vibration impact of the vibration table on the vibrating centrifuge body is a technical problem that needs to be solved urgently. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a vibrating centrifuge polyurethane isolator for isolating a vibrating table from a vibrating centrifuge arm to reduce the impact of the vibrating table on the vibrating centrifuge body.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a vibrating centrifuge polyurethane vibration isolator, a vibrating table is arranged in the end cavity of the vibrating centrifuge arm, the vibrating table includes a table body and a moving coil, and the moving coil can drive the table body to vibrate; when the vibrating centrifuge is working, the vibrating centrifuge arm rotates horizontally along the axis of the vibrating centrifuge, and one end of the table body subjected to the centrifugal force can contact the inner end surface of the vibrating centrifuge arm, so that the vibration can be transmitted to the vibrating centrifuge arm; the vibrating centrifuge polyurethane vibration isolator is arranged on the table body The vibrating centrifuge polyurethane vibration isolator comprises a metal top plate, a metal bottom plate and a multi-layer metal partition plate arranged between the metal bottom plate and the metal top plate, and the metal top plate, the metal bottom plate and the metal partition plate are bonded to form a laminated structure by vulcanization of an elastomer. The vibration isolator is annular, and a plurality of mounting holes are arranged along the circumference of the vibrating centrifuge polyurethane vibration isolator. Bolts pass through the mounting holes to mount the vibrating centrifuge polyurethane vibration isolator on one end surface of the table body.

[0007] Furthermore, the mounting hole includes hole one and hole two, hole one passes through the metal partition and the elastomer layer in sequence from the metal top plate, hole two is arranged on the metal bottom plate, and hole one and hole two are connected; the bolts install the vibration centrifuge polyurethane vibration isolator to the platform through hole one and hole two, at which time the head of the bolt is located in hole one, and there is an annular gap one between the head of the bolt and hole one; when the vibration centrifuge is working, the elastic body of the vibration centrifuge polyurethane vibration isolator is compressed and deformed under the action of centrifugal force to bulge toward hole one, and at this time there is still a gap two between hole one and the head of the bolt.

[0008] Furthermore, the hole 1 is a conical hole, and its diameter gradually decreases from the metal top plate to the metal bottom plate.

[0009] Furthermore, the elastomer is a polyurethane rubber material, the hardness of the polyurethane rubber material is (60~90) Shore A, the damping factor is 0.1~0.2, and the tensile strength is greater than 20MPa.

[0010] Furthermore, the elastomer is provided with a conical groove, which is located on the inner circumference and outer circumference of each layer of the elastomer, and the conical groove includes a bottom semi-circular arc portion, a sloped surface 1 extending outwardly along both ends of the semi-circular arc portion, a straight surface extending in the tangent direction of the end of the semi-circular arc portion of the slope, and a sloped surface 2 extending outwardly along the straight surface; the arc portion, the sloped surface 1, the straight surface and the sloped surface 2 are connected in sequence to form a conical groove; in the direction perpendicular to the axis of the polyurethane vibration isolator of the vibrating centrifuge, the sloped surface 1 has an angle α, and the sloped surface 2 has an angle β, and α and β satisfy: α<β.

[0011] Furthermore, the locations of the metal top plate, the metal bottom plate and the metal partition exposed to the atmosphere are coated with a protective layer.

[0012] Furthermore, the metal top plate, metal bottom plate and metal partition are all made of low-alloy high-strength structural steel.

[0013] The beneficial effects of the present invention are: (1) The present invention arranges a vibrating centrifuge polyurethane vibration isolator between the end of the vibrating centrifuge arm and one end of the table body of the vibrating table, so that when the vibrating centrifuge rotates, the vibrating centrifuge arm rotates in a horizontal plane along the axis of the vibrating centrifuge. The vibrating centrifuge polyurethane vibration isolator can isolate one end of the table body subjected to the centrifugal force from the inner end surface of the vibrating centrifuge arm, thereby reducing the vibration effect transmitted to the vibrating centrifuge arm, thereby reducing the influence on the vibration of the vibrating centrifuge.

[0014] (2) A plurality of mounting holes are arranged on the vibration centrifuge polyurethane vibration isolator along the circumference thereof. The mounting holes are arranged in a manner of combining a conical hole 1 and a circular hole 2. After the bolts pass through the mounting holes to vertically mount the vibration centrifuge polyurethane vibration isolator between the end of the vibrating centrifuge arm and one end of the table, a gap 1 is left between the bolt head and the hole 1. When the vibration isolator is compressed to the maximum extent, a gap 2 is still left between the bolt head and the hole 1 to prevent the elastomers on both sides of the mounting holes from interfering with the bolt heads and damaging the elastomers.

[0015] (3) The present invention uses an elastomer of polyurethane rubber material with moderate hardness and high damping to be compounded with a metal rigid plate, so that the vibrating centrifuge polyurethane vibration isolator has a certain rigidity and also has a good vibration isolation effect.

[0016] (4) Conical grooves are arranged on the inner and outer surfaces of the elastomer, so that the polyurethane vibration isolator of the vibrating centrifuge has sufficient deformation space when it is compressed by pressure, preventing the elastomer from protruding from the edge of the vibrating centrifuge polyurethane vibration isolator after compression and being worn, thereby affecting the life of the elastomer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the position structure of the distal end of the main arm of a vibrating centrifuge in the prior art; Figure 2 A schematic diagram of the installation position relationship of the polyurethane vibration isolator for a vibrating centrifuge according to an embodiment of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the polyurethane vibration isolator for a vibrating centrifuge according to an embodiment of the present invention; Figure 4 for Figure 3 Schematic diagram of the middle AA section; Figure 5 A cross-sectional view of the installation portion of the polyurethane vibration isolator for a vibrating centrifuge according to an embodiment of the present invention; Figure 6 for Figure 4 A partial enlarged view of B in the middle; Figure 7 for Figure 5 A partial enlarged view of D in the middle; Figure 8 A schematic diagram of the vibration isolation process of a vibrating centrifuge polyurethane isolator according to an embodiment of the present invention; Fig. 9 for Figure 8 A partial enlarged view of middle E; Fig.10 for Figure 6 A partial enlarged view of middle C; Fig.11 This is a stress cloud diagram of the elastic body of the polyurethane vibration isolator of the vibrating centrifuge according to an embodiment of the present invention; Fig.12 The elastic body strain cloud diagram of the vibrating centrifuge polyurethane isolator according to the embodiment of the present invention; Fig.13 The stress cloud diagram of the metal top plate, metal partition plate and metal bottom plate of the polyurethane vibration isolator of the vibrating centrifuge according to the embodiment of the present invention; Fig.14 The stiffness curve of the polyurethane isolator of the vibrating centrifuge under different compression amounts.

[0018] In the figure: 1. vibrating centrifuge arm, 2. vibrating centrifuge polyurethane vibration isolator, 21. metal top plate, 22. metal partition, 23. metal bottom plate, 24. elastomer, 241. conical groove, 2411. semicircular arc portion, 2412. inclined surface 1, 2413. inclined surface 2, 25. mounting hole, 251. hole 1, 252. hole 2, 3. vibration table, 31. moving coil, 32. table body, 4. gap 1, 5. gap 2, 6. bolt head, 7. protective layer. DETAILED DESCRIPTION

[0019] To make the purpose, technical solution and advantages of the embodiments of the invention more clear, the following will be combined with the appended drawings of the embodiments of the invention to Figure 2-14 , clearly and completely describe the technical solutions of the embodiments of the invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0020] It should be noted that all directional indications (such as up, down, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship of the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. Example

[0021] like Figure 2As shown, a vibrating table 3 is arranged in the end cavity of the vibrating centrifuge arm 1, and the vibrating table 3 includes a moving coil 31 and a table body 32, and the moving coil 31 can drive the table body 32 to vibrate; when the vibrating centrifuge is working, in order to prevent the background technology (such as Figure 1 As shown in the figure, the platform 32 moves toward the end of the vibrating centrifuge arm 1 under the action of the centrifugal force F, so that the end surface of one end of the platform 32 contacts the inner end surface of the vibrating centrifuge arm 1 and transmits the vibration to the vibrating centrifuge arm 1. The vibrating centrifuge polyurethane isolator 1 of the present application is installed between the end surface of one end of the platform 32 and the inner end surface of the vibrating centrifuge arm 1. Figure 3 , Figure 4 and Figure 5 As shown, the vibrating centrifuge polyurethane vibration isolator 2 includes a metal top plate 21, a metal bottom plate 23 and a multi-layer metal partition 22 arranged between the metal top plate 21 and the metal bottom plate 23. The metal top plate 21, the metal bottom plate 23 and the metal partition 23 are vulcanized and bonded to form a laminated structure through an elastomer 24. The vibrating centrifuge polyurethane vibration isolator 2 of the present application is annular, and a plurality of mounting holes 25 are arranged on the vibrating centrifuge polyurethane vibration isolator 2 along the circumference of the vibrating centrifuge polyurethane vibration isolator 2. Bolts are passed through the mounting holes 25 to mount the vibrating centrifuge polyurethane vibration isolator 2 on one end surface of the table body 32. In this embodiment, the vibrating centrifuge polyurethane vibration isolator 2 is annular, mainly to adapt to the installation environment of the circular inner cavity of the vibrating centrifuge. The metal top plate 21, metal bottom plate 23 and multi-layer metal partition 22 provided on the vibrating centrifuge polyurethane vibration isolator can provide sufficient rigidity for the vibrating centrifuge polyurethane vibration isolator 2, so that it can withstand a large load; the elastomer vulcanized on the metal top plate 21, metal bottom plate 23 and multi-layer metal partition 22 can provide a good vibration isolation effect for the vibrating centrifuge polyurethane vibration isolator. By installing the above-mentioned vibrating centrifuge polyurethane vibration isolator 2 between one end face of the table body 32 and the inner end face of the vibrating centrifuge arm 1, the vibrating table 3 is isolated from the vibrating centrifuge arm 1, thereby reducing the vibration effect of the vibrating table 1 on the vibrating centrifuge body.

[0022] It should be noted that in this embodiment, the total number of metal partitions 22 is preferably three layers, and the number of layers of elastomers 24 is preferably four layers. The number of layers of metal partitions 22 and elastomers 24 can also be adjusted according to the stiffness of the isolator 2 and the vibration isolation effect.

[0023] like Figure 6 As shown, the mounting hole 25 includes a hole 1 251 and a hole 252. The hole 1 251 passes through the metal partition 22 and the elastic body 24 from the metal top plate 21 in sequence. The hole 252 is set on the metal bottom plate. The hole 1 251 and the hole 2 252 are connected; Figure 7As shown, the bolts are installed on one end surface of the platform 32 through the hole 251 and the hole 252. At this time, the bolt head 6 of the bolt is located in the hole 251, and there is an annular gap 4 between the bolt head 6 and the hole 251; Figure 8 and Fig. 9 As shown, when the vibration centrifuge is working, the elastic body 24 of the vibration isolator 2 is compressed and deformed under the action of centrifugal force to bulge toward the hole 1 251, and at this time, there is still a gap 25 between the hole 1 251 and the bolt head 6. The purpose of this arrangement is to prevent the bolt head 6 from interfering with the elastic body 24 in the mounting hole 25, to prevent the bolt head 6 from wearing the elastic body, causing the elastic body 24 to crack and affect the vibration isolation effect and service life of the vibration centrifuge polyurethane vibration isolator 2.

[0024] Figure 6 and Figure 7 As shown, hole 1 251 is a conical hole, and its diameter gradually decreases from the metal top plate 21 to the metal bottom plate 23. Setting hole 1 251 as a conical hole facilitates the metal top plate 21, the metal bottom plate 23 and the metal partition plate 23 to be vulcanized and bonded with the elastic body 24 to form a laminated structure as a whole, which has a draft angle when demolding, and is easy to be released from the mold.

[0025] like Figure 4 As shown, the elastic body 24 is a polyurethane rubber material. The polyurethane rubber material used in this embodiment has a hardness of (60~90) Shore A, a damping factor of 0.1~0.2, and a tensile strength greater than 20 MPa. Fig.11 and Fig.12 As shown in the figure, the stress cloud diagram and strain cloud diagram of the elastomer 24 in the vibrating centrifuge polyurethane vibration isolator 2 show that the elastomer 24 has good deformation ability, so that the vibrating centrifuge polyurethane vibration isolator 2 has good compression performance, and can absorb and buffer the vibration energy transmitted from the vibration table 3 to the vibrating centrifuge arm 1, so that the vibrating centrifuge polyurethane vibration isolator 2 has a good vibration isolation effect, thereby reducing the vibration influence of the vibration table 3 on the vibrating centrifuge arm 1.

[0026] like Fig.10As shown, the elastic body 24 is provided with a conical groove 241, and the inner and outer surfaces of each layer of the elastic body 3 are provided with a conical groove structure 241, and the conical groove structure 241 includes a semicircular arc portion 2411 at the bottom, a slope 1 2412 extending outward along the two ends of the semicircular arc portion 2411, and a slope 2 2413 extending outward along the slope 1 2413; the arc portion 2411, the slope 1 2412 and the slope 2 2413 are sequentially connected to form a conical groove structure 241; in the direction perpendicular to the axis of the vibration isolator 2, the slope 1 2412 has an angle α, and the slope 2 2414 has an angle β, and α and β satisfy: α<β. The conical groove 241 is provided so that the vibration isolator 2 has a certain deformation space when it is squeezed, so as to prevent the inner and outer circumferences of the elastic body 24 from rubbing against other components after protruding outwards, thereby damaging the elastic body 24 and affecting the life of the elastic body 24, thereby affecting the vibration isolation effect of the vibration isolator 2. It is also arranged that the inclined plane 1 2412 has an angle α, and the inclined plane 2 2414 has an angle β in a direction perpendicular to the axis of the vibrating centrifuge polyurethane isolator 2, and α and β satisfy: α<β; this arrangement is to make the thickness of the elastomer 24 between the inclined plane 1 2412 and the metal top plate 21, the metal partition plate 22 and the metal bottom plate 23 greater than the thickness of the elastomer 24 between the inclined plane 2414 and the metal top plate 21, the metal partition plate 22, and the metal bottom plate 23, thereby ensuring the vulcanization bonding effect of the elastomer 24 and the metal top plate 21, the metal partition plate 22, and the metal bottom plate 23.

[0027] like Figure 4 As shown, the metal top plate 21, the metal partition plate 22 and the metal bottom plate 23 exposed to the atmosphere are coated with a protective layer 7. This is to prevent the metal top plate 21, the metal bottom plate 23 and the metal partition plate 22 exposed to the atmosphere from being corroded for a long time and affecting the overall vibration isolation effect and stiffness of the vibrating centrifuge polyurethane isolator 2.

[0028] like Figure 4 As shown, the metal top plate 21, the metal partition plate 22 and the metal bottom plate 23 are all made of low-alloy high-strength structural steel. When the isolator is subjected to stress testing, Fig.13 As shown, from the stress cloud diagram of the metal top plate 21, the metal partition plate 22 and the metal bottom plate 23 of the vibration isolator, it can be seen that the use of low-alloy high-strength structural steel can withstand very large stress, which means that the large load-bearing requirements of the vibrating centrifuge polyurethane vibration isolator can be met.

[0029] Fig.14 As shown, the vibrating centrifuge polyurethane vibration isolator 2 was subjected to a stiffness test and a deformation capacity test, and it can be seen that the vibrating centrifuge polyurethane vibration isolator 2 has a large stiffness and a good vibration isolation effect.

[0030] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Technicians in the relevant technical field may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the protection scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims

1. A polyurethane vibration isolator for a vibrating centrifuge, wherein a vibrating table is arranged in a cavity at the end of a large arm of the vibrating centrifuge, the vibrating table comprises a table body and a moving coil, and the moving coil can drive the table body to vibrate; when the vibrating centrifuge is working, the large arm of the vibrating centrifuge rotates horizontally along the axis of the vibrating centrifuge, and one end of the table body subjected to the centrifugal force can contact the inner end surface of the large arm of the vibrating centrifuge, so that the vibration can be transmitted to the large arm of the vibrating centrifuge; the characteristics are: The polyurethane vibration isolator for a vibrating centrifuge is arranged between an end surface of a table body and an inner end surface of a large arm of the vibrating centrifuge, isolating the table body from the large arm of the vibrating centrifuge; the polyurethane vibration isolator for a vibrating centrifuge comprises a metal top plate, a metal bottom plate and a multi-layer metal partition plate arranged between the metal bottom plate and the metal top plate, the metal top plate, the metal bottom plate and the metal partition plate are bonded to form a laminated structure by vulcanization of an elastomer, the vibration isolator is in a circular ring shape, and a plurality of mounting holes are arranged along the circumference of the polyurethane vibration isolator for a vibrating centrifuge, and bolts are passed through the mounting holes to mount the polyurethane vibration isolator for a vibrating centrifuge on an end surface of the table body.

2. The vibrating centrifuge polyurethane isolator according to claim 1, characterized in that: The mounting holes include hole one and hole two, wherein hole one passes through the metal partition and the elastomer layer in sequence from the metal top plate, and hole two is arranged on the metal bottom plate, and hole one and hole two are connected; the bolts are used to mount the vibration centrifuge polyurethane isolator to the platform through hole one and hole two, at which time the head of the bolt is located in hole one, and there is an annular gap one between the head of the bolt and hole one; when the vibration centrifuge is working, the elastic body of the isolator is compressed and deformed under the action of centrifugal force to bulge toward hole one, and at this time there is still a gap two between hole one and the head of the bolt.

3. The vibrating centrifuge polyurethane isolator according to claim 2, characterized in that: The first hole is a conical hole, the diameter of which gradually decreases from the metal top plate to the metal bottom plate.

4. The vibrating centrifuge polyurethane isolator according to claim 1, characterized in that: The elastomer is a polyurethane rubber material, the hardness of the polyurethane rubber material is (60-90) Shore A, the damping factor is 0.1-0.2, and the tensile strength is greater than 20 MPa.

5. The vibrating centrifuge polyurethane isolator according to claim 1, characterized in that: The inner circumference and outer circumference of each layer of the elastomer are provided with a conical groove structure, and the conical groove structure includes a semicircular arc portion, a slope 1 extending outward along the two ends of the semicircular arc portion, and a slope 2 extending outward along the slope 1; the arc portion, the slope 1 and the slope 2 are connected in sequence to form a conical groove structure; in the direction perpendicular to the axis of the vibrating centrifuge polyurethane isolator, the slope 1 has an angle α, and the slope 2 has an angle β, and α and β satisfy: α<β.

6. The vibrating centrifuge polyurethane isolator according to claim 1, characterized in that: The metal top plate, metal bottom plate and metal partitions exposed to the atmosphere are coated with a protective layer.

7. The vibrating centrifuge polyurethane isolator according to claim 1, characterized in that: The metal top plate, metal bottom plate and metal partition plate are all made of low-alloy high-strength structural steel.

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