A base with adjustable resonance characteristics and adjustment method

Abstract

The present invention relates to the field of resonance adjustment technology, and specifically discloses a base with adjustable resonance characteristics and an adjustment method, wherein the base includes a bearing portion, an upper adjustment portion is coaxially processed on the upper portion of the bearing portion, and a lower adjustment portion is coaxially processed on the lower portion of the bearing portion. The machine is fixed on a foundation through the base, and if resonance occurs on site, the lower adjustment portion is cut, and the inner edge size and the inner edge height of the lower adjustment portion are gradually increased, so that the natural frequency deviates from the resonance frequency. The present invention can significantly change the resonance characteristics of the device without changing the device and the foundation, and without changing the external interface of the device.

Description

Technical Field

[0001] The invention belongs to the technical field of resonance adjustment, and in particular relates to a base with adjustable resonance characteristics and an adjustment method. Background Art

[0002] Compared with horizontal machines, vertical machines are taller and have a smaller installation span. During installation, the lower end of a vertical machine is usually fixed to the foundation through a base, and the upper end is usually free. These structural characteristics of vertical machines determine that the low-order natural frequency after installation is small, sometimes even close to or lower than the rotation frequency of the machine. When the natural frequency is close to the rotation frequency, it is easy to cause equipment resonance, resulting in large vibration. Therefore, the resonance phenomenon of vertical machines is more likely to occur than that of horizontal machines.

[0003] When installing vertical equipment, the foundation of the equipment needs to be arranged according to the actual situation on site. Therefore, even if it is the same equipment, it may pass the vibration test on the test bench and in some sites, but fail the resonance test in other sites. In equipment commissioning and maintenance, in order to solve similar problems, it is often necessary to either replace the equipment model or modify the foundation to change the resonance characteristics of the equipment on the foundation. This method has a very high cost in terms of economy, time and manpower, and it is often difficult to meet the project progress and economic budget requirements.

[0004] In order to quickly solve the resonance problem of the equipment on site without changing the equipment structure, basic structure and related interfaces, it is urgent to design a base with adjustable vibration characteristics and an adjustment method. Summary of the invention

[0005] The object of the present invention is to provide a base with adjustable resonance characteristics and an adjustment method to solve the resonance problem of vertical equipment.

[0006] The technical solution of the present invention is as follows:

[0007] A base with adjustable resonance characteristics, comprising a bearing portion, a lower adjustment portion and an upper adjustment portion;

[0008] The outer edge shape of the bearing portion is adjusted according to the foundation adaptability;

[0009] A base connection bolt hole and a base positioning pin hole are processed at the outer edge of the bearing portion so as to fix the base to the foundation by bolts and pins;

[0010] A coupling hole is machined at the center of the bearing part to facilitate the driving shaft of the machine to pass through the base, and the shape of the coupling hole is adjusted according to the adaptability of the machine foot;

[0011] An upper adjustment portion is coaxially processed on the upper portion of the bearing portion;

[0012] The upper adjustment part is a raised ring platform, and its outer edge shape is the same as the outer edge shape of the bearing part;

[0013] A machine connection platform is processed at the upper inner edge of the upper adjustment part;

[0014] The shape of the outer edge of the machine connection platform is adapted to the machine base;

[0015] The machine connection platform is provided with machine connection screw holes and machine positioning stoppers so as to fix the machine to the base by screws;

[0016] A lower adjustment portion is coaxially processed at the lower portion of the bearing portion;

[0017] The lower adjustment part is a raised ring platform, and the outer edge shape of the lower adjustment part is the same as the outer edge shape of the bearing part, so as to facilitate the installation of the base.

[0018] The machine positioning stop is a sunken platform coaxial with the machine connecting platform.

[0019] The upper surface of the machine connection platform is lower than the upper surface of the upper adjusting portion.

[0020] The outer edge shape of the bearing part is circular, the shape of the shaft connecting hole is circular, and the outer edge shape of the machine connecting platform is circular.

[0021] The total height of the base is H0, and the height of the lower adjustment part is H d , the height of the upper adjustment part is H D , H0-H d -H D >H r ; Among them, H r The minimum plate thickness required to support the machine and its operation.

[0022] A method for adjusting a base based on adjustable resonance characteristics of the base comprises the following steps:

[0023] Step 1: Calculate the minimum load-bearing plate thickness

[0024] Select the outer edge size of the load-bearing plate, and determine the minimum plate thickness required for the load-bearing machine and the machine operation according to the machine gravity load borne by the load-bearing plate, the load of the load-bearing plate when the machine is working, and the load of the load-bearing plate under earthquake conditions, which is recorded as H. r ;

[0025] Step 2: Machining the Base

[0026] Processing base, the total height is H0, H0 value is 2H r ~10H r between;

[0027] Step 3: Resonance Adjustment

[0028] Fix the machine on the foundation through the base. If resonance occurs on site, cut the lower adjustment part and gradually increase the inner edge size and inner edge height H of the lower adjustment part. d , so that the natural frequency deviates from the resonant frequency to improve the resonance characteristics.

[0029] In step 3, if the inner edge height H of the lower adjustment part is further increased during the cutting process of the lower adjustment part, d This will cause the machine connection screw hole to be cut, and H will no longer be increased. d At this time, in order to further change the resonance characteristics, the upper adjustment part is cut to gradually reduce the outer edge size of the upper adjustment part and increase the outer edge height H of the upper adjustment part. D , so that the natural frequency deviates from the resonant frequency to improve the resonance characteristics.

[0030] During the adjustment process in step 3, ensure that H0-H d -H D >H r .

[0031] The base processed in step 2, wherein the outer edge size of the bearing part is the same as the outer edge size of the bearing plate selected in step 1, the inner edge size of the lower adjustment part is the same as the inner edge size of the bearing part, and the outer edge size of the upper adjustment part is the same as the outer edge size of the bearing part.

[0032] The machine described is a vertical machine.

[0033] The remarkable effects of the present invention are:

[0034] (1) The present invention can significantly change the resonance characteristics of a device without changing the device and foundation, and without changing the external interface of the device.

[0035] (2) The structure of the present invention can be applied to different on-site conditions, and the on-site resonance problem can be quickly solved by adjusting according to the method of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A front view of a base that is adjustable for resonance characteristics;

[0037] Figure 2 Top view of the base with adjustable resonance characteristics.

[0038] In the figure: 1. Load-bearing part; 2. Lower adjustment part; 3. Upper adjustment part; 4. Machine connecting platform; 5. Machine positioning stop; 6. Coupling hole; 7. Machine connecting screw hole; 8. Base connecting bolt hole; 9. Base positioning pin hole. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] like Figures 1-2 The base with adjustable resonance characteristics shown in the figure comprises a bearing part 1 , a lower adjustment part 2 and an upper adjustment part 3 .

[0041] The outer edge shape of the bearing portion 1 can be adjusted according to basic adaptability, and can be circular, rectangular, etc. The present invention is described by taking a circle as an example, and its outer diameter is D0.

[0042] A base connection bolt hole 8 and a base positioning pin hole 9 are processed at the outer edge of the bearing portion 1 so that the base can be fixedly connected to the foundation by bolts and pins.

[0043] A coupling hole 6 is processed at the center position of the bearing part 1 to facilitate the driving shaft of the vertical equipment to pass through the base. The shape of the coupling hole 6 is adjusted according to the adaptability of the machine foot and can be circular, rectangular, etc. When it is circular, its inner diameter is d0.

[0044] An upper adjustment portion 3 is coaxially processed on the upper portion of the bearing portion 1. The upper adjustment portion 3 is a raised ring platform with a height of H D , its outer edge shape is the same as the outer edge shape of the bearing part 1, and the outer edge diameter is D.

[0045] A machine connection platform 4 is processed at the upper inner edge of the upper adjustment part 3, and the upper surface of the machine connection platform 4 is lower than the upper surface of the upper adjustment part 3. The outer edge shape of the machine connection platform 4 is adapted to the machine base, and can be circular, square, etc. The present invention is described by taking a circular shape as an example. Machine connection screw holes 7 and machine positioning stoppers 5 are processed on the machine connection platform 4, so that the machine can be fixedly connected to the base by screws. The machine positioning stoppers 5 are sunken platforms, which are coaxial with the machine connection platform 4.

[0046] A lower adjustment portion 2 is coaxially processed at the lower part of the bearing portion 1. The lower adjustment portion 2 is a raised ring platform with a height of H d The outer edge shape of the lower adjusting portion 2 is the same as the outer edge shape of the bearing portion 1, so as to facilitate the base installation. The inner edge shape of the lower adjusting portion 2 is circular, with a diameter of d.

[0047] The total height of the base is H0, H0-H d -H D >H r Among them, H r The minimum plate thickness required to support the machine and its operation.

[0048] A method for adjusting a base with adjustable resonance characteristics, using the above base for operation, comprises the following steps:

[0049] Step 1: Calculate the minimum load-bearing plate thickness

[0050] When the outer diameter of the bearing plate is D0, the minimum plate thickness required for the bearing machine and the machine operation is determined according to the machine gravity load borne by the bearing plate, the operating load of the bearing plate when the machine is working, and the load of the bearing plate under earthquake conditions, which is recorded as H. r ;

[0051] Step 2: Machining the Base

[0052] Processing base, the total height is H0, H0 value is 2H r ~10H r between;

[0053] The outer diameter of the bearing part 1 is D0, the inner diameter is d0, the inner edge diameter of the lower adjustment part 2 is d=d0, and the inner edge height is H d The outer diameter of the upper adjustment part 3 is D = D0, and the outer height is H D ;

[0054] Step 3: Resonance Adjustment

[0055] Fix the machine on the foundation through the base. If resonance occurs on site, cut the lower adjustment part 2 and gradually increase the inner edge diameter d and the inner edge height H of the lower adjustment part 2. d , so that the natural frequency deviates from the resonant frequency to improve the resonance characteristics;

[0056] If during the cutting process of the lower adjustment portion 2, the inner edge height H of the lower adjustment portion 2 is increased d This will cause the machine connection screw hole 7 to be cut, and H will no longer increase. d At this time, in order to further change the resonance characteristics, the upper adjustment portion 3 is cut, gradually reducing the outer edge diameter D of the upper adjustment portion 3 and increasing the outer edge height H of the upper adjustment portion 3 D , so that the natural frequency deviates from the resonant frequency to improve the resonance characteristics;

[0057] During the adjustment process, H0-H d -H D >H r .

Claims

1. A base with adjustable resonance characteristics, characterized in that: It comprises a bearing part (1), a lower adjustment part (2) and an upper adjustment part (3); The outer edge shape of the bearing portion (1) is adjusted according to the foundation adaptability; A base connection bolt hole (8) and a base positioning pin hole (9) are processed at the outer edge of the bearing portion (1) so as to fix the base to the foundation by means of bolts and pins; A coupling hole (6) is machined at the center of the bearing portion (1) to facilitate the driving shaft of the machine to pass through the base, and the shape of the coupling hole (6) is adjusted according to the adaptability of the machine foot; An upper adjustment portion (3) is coaxially processed on the upper portion of the bearing portion (1); The upper adjustment portion (3) is a raised ring platform, and its outer edge shape is the same as the outer edge shape of the bearing portion (1); A machine connection platform (4) is processed at the upper inner edge of the upper adjustment portion (3); The outer edge shape of the machine connection platform (4) is adapted to the machine base; The machine connection platform (4) is provided with a machine connection screw hole (7) and a machine positioning stop (5) so that the machine can be fixedly connected to the base by screws; A lower adjustment portion (2) is coaxially processed at the lower portion of the bearing portion (1); The lower adjustment part (2) is a raised ring platform, and its outer edge shape is the same as the outer edge shape of the bearing part (1) to facilitate base installation.

2. A base with adjustable resonance characteristics as claimed in claim 1, characterized in that: The machine positioning stop (5) is a sunken platform coaxial with the machine connecting platform (4).

3. A base with adjustable resonance characteristics as claimed in claim 2, characterized in that: The upper surface of the machine connection platform (4) is lower than the upper surface of the upper adjustment part (3).

4. A base with adjustable resonance characteristics as claimed in claim 3, characterized in that: The outer edge of the bearing portion (1) is circular, the coupling hole (6) is circular, and the outer edge of the machine connection platform (4) is circular.

5. A base with adjustable resonance characteristics as claimed in any one of claims 1 to 4, characterized in that: The total height of the base is H0, and the height of the lower adjustment part (2) is H d , the height of the upper adjustment part (3) is H D , H0-H d -H D >H r ; Among them, H r The minimum plate thickness required to support the machine and its operation.

6. A method for adjusting a base with adjustable resonance characteristics based on the base of claim 5, characterized in that: The following steps are involved: Step 1: Calculate the minimum load-bearing plate thickness Select the outer edge size of the load-bearing plate, and determine the minimum plate thickness required for the load-bearing machine and the machine operation according to the machine gravity load borne by the load-bearing plate, the load of the load-bearing plate when the machine is working, and the load of the load-bearing plate under earthquake conditions, which is recorded as H. r ; Step 2: Machining the Base Processing base, the total height is H0, H0 value is 2H r ~10H r between; Step 3: Resonance Adjustment Fix the machine on the foundation through the base. If resonance occurs on site, cut the lower adjustment part (2) and gradually increase the inner edge size and inner edge height H of the lower adjustment part (2). d , so that the natural frequency deviates from the resonant frequency to improve the resonance characteristics.

7. A method for adjusting a base with adjustable resonance characteristics as claimed in claim 6, characterized in that: In step 3, if the inner edge height H of the lower adjustment portion (2) is further increased during the cutting process of the lower adjustment portion (2), d This will cause the machine connection screw hole (7) to be cut, and H will no longer increase. d At this time, in order to further change the resonance characteristics, the upper adjustment portion (3) is cut to gradually reduce the outer edge size of the upper adjustment portion (3) and increase the outer edge height H of the upper adjustment portion (3). D , so that the natural frequency deviates from the resonant frequency to improve the resonance characteristics.

8. A method for adjusting a base with adjustable resonance characteristics as claimed in claim 7, characterized in that: During the adjustment process in step 3, ensure that H0-H d -H D >H r .

9. A method for adjusting a base with adjustable resonance characteristics as claimed in claim 8, characterized in that: The base processed in step 2, wherein the outer edge size of the bearing part (1) is the same as the outer edge size of the bearing plate selected in step 1, the inner edge size of the lower adjustment part (2) is the same as the inner edge size of the bearing part (1), and the outer edge size of the upper adjustment part (3) is the same as the outer edge size of the bearing part (1).

10. A method for adjusting a base with adjustable resonance characteristics as claimed in claim 9, characterized in that: The machine is a vertical machine.

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