Ejector rod of vibration exciter

Abstract

The utility model relates to a vibration exciter ejector rod which is composed of a sensor base (1), a plastic-coated steel wire rope (2), a vibration exciter connecting piece (3) and a fixing nut (4). The upper part of the sensor base (1) is connected with a sensor through a bolt; the upper part of the plastic-coated steel wire rope (2) is inserted into a preformed hole of the sensor base (1), and the lower part is inserted into a preformed hole of the head of the vibration exciter connecting piece (3); the vibration exciter connecting piece (3) is of a screw structure, the head is provided with a preformed hole, and the lower part of the screw is provided with threads; and the vibration exciter ejector rod is fixed after being connected with the vibration exciter through the fixing nut (4). According to the utility model, the problem that the connection between the sensor and the old-fashioned hard metal rod is easy to fall off in the excitation process is solved, the stability of a modal test can be improved, and the efficiency of the modal test is effectively improved.

Description

Technical Field

[0001] This utility model relates to a modal testing device for modal testing of products, specifically a vibrator top rod. Background Technology

[0002] Modal testing involves placing sensors on the product to collect system input and output signals, and then obtaining modal parameters through parameter identification. The purpose of the test is to evaluate the dynamic characteristics of the existing structure of the product and identify weaknesses in the design. During modal testing, a vibrator is used to generate excitation, which is transmitted to the product with minimal distortion through the vibrator's push rod.

[0003] The exciter push rod is an important component for the rigid connection between the exciter and the product. It is required to have good rigidity along the axial direction of the push rod to facilitate the transmission of excitation, and good flexibility along the radial direction of the push rod so that radial bending does not affect the measurement results.

[0004] Currently, the exciter push rod in China is usually a solid metal rod with poor radial flexibility. During the test, a small radial displacement between the sensor and the exciter push rod can cause the sensor to fall off the product, forcing the test to be interrupted. Summary of the Invention

[0005] The purpose of this utility model is:

[0006] This utility model proposes a vibrator push rod. The purpose of inventing this vibrator push rod is to enhance the radial flexibility of the vibrator push rod and ensure the stability of modal testing.

[0007] The technical solution of this utility model:

[0008] A vibrator push rod is composed of a sensor base ①, a plastic-coated steel wire rope ②, a vibrator connector ③, and a fixing nut ④;

[0009] The sensor base ① has a bolt connecting the sensor to the upper part and a pre-drilled hole at the lower part;

[0010] The upper part of the plastic-coated steel wire rope ② is inserted into the reserved hole of the sensor base ①, and the lower part is inserted into the reserved hole of the head of the exciter connector ③;

[0011] The vibrator connector ③ is a screw structure with a pre-drilled hole at the head and a thread at the bottom of the screw.

[0012] Fixing nut ④ secures the vibrator top rod to the vibrator after connection.

[0013] Its characteristic is that the exciter top rod is installed on the exciter table mounting position through the exciter connector and nut.

[0014] Its characteristic is that the sensor is connected via a sensor base.

[0015] Its characteristic feature is that the sensor base ① is a square lightweight metal block.

[0016] The feature is that the two ends of the plastic-coated steel wire rope ② are respectively inserted into the reserved holes at the head of the vibrator connector ③ and the reserved holes in the sensor base ①, and then sealed with epoxy resin or other adhesive materials.

[0017] The feature is that there are two fixing nuts ④. The lower fixing nut ④ is used to fix the exciter top rod and the exciter, and the upper fixing nut ④ is used to prevent the screw of the exciter connecting part ③ from loosening during the excitation test.

[0018] The beneficial effects of this utility model are:

[0019] By designing the exciter push rod of this invention, the problem of the sensor easily detaching from the old-fashioned rigid metal rod connection during vibration is improved. It also enhances the stability of modal testing and effectively increases the efficiency of modal testing. This exciter push rod is easy to manufacture, has low manufacturing cost, and reduces testing costs. Attached Figure Description

[0020] Figure 1 Schematic diagram of exciter push rod

[0021] Figure 2 Vibrator push rod installation diagram

[0022] Among them, ①——sensor base, ②——plastic-coated steel wire rope, ③——vibrator connector, ④——fixing nut, ⑤——product, ⑥——sensor, ⑦——vibrator top rod, ⑧——vibrator Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings:

[0024] like Figure 1 As shown, a vibrator top rod of the present invention comprises a sensor base ①, a plastic-coated steel wire rope ②, a vibrator connector ③, and a fixing nut ④; the upper part of the sensor base ① is connected to the sensor by bolts, and the lower part has a reserved hole; the upper part of the plastic-coated steel wire rope ② is inserted into the reserved hole of the sensor base ①, and the lower part is inserted into the reserved hole at the head of the vibrator connector ③; the vibrator connector ③ is a screw structure with a reserved hole at the head and threads at the lower part of the screw; the fixing nut ④ secures the vibrator top rod after it is connected to the vibrator.

[0025] The installation process of the exciter push rod during modal testing is as follows: Figure 2 As shown:

[0026] 1) Connect the exciter connector ③ at the bottom of the exciter top rod ⑦ to the exciter ⑧. At this time, the two fixing nuts ④ are not fixed.

[0027] 2) Attach sensor ⑥ to product ⑤;

[0028] 3) Connect the sensor base ① of the vibrator top rod ⑦ to the sensor ⑥ and tighten it;

[0029] 4) Adjust the vibrator ⑧ to an appropriate position so that the sensor base ① of the vibrator top rod ⑦, the plastic-coated steel wire rope ②, and the vibrator connector ③ are on the same axis, so as to ensure that the excitation generated by the vibrator ⑧ is transmitted to the product ⑤ along the axial direction of the vibrator top rod ⑦.

[0030] 5) Fix the two fixing nuts ④ that connect the lowest vibrator connector ③ to the vibrator ⑧ on the vibrator top rod ⑦. First fix the lower fixing nut ④, and then fix the upper fixing nut ④.

[0031] 6) After the above installation is completed, modal testing can be performed on the test product ⑤.

Claims

1. A vibrator push rod, comprising a sensor base ①, a plastic-coated steel wire rope ②, a vibrator connector ③, and a fixing nut ④; Its features are, The sensor base ① has a bolt connecting the sensor to the upper part and a pre-drilled hole at the lower part; The upper part of the plastic-coated steel wire rope ② is inserted into the reserved hole of the sensor base ①, and the lower part is inserted into the reserved hole of the head of the exciter connector ③; The vibrator connector ③ is a screw structure with a pre-drilled hole at the head and a thread at the bottom of the screw. Fixing the nut ④ secures the vibrator top rod to the vibrator after connection.

2. The exciter push rod as described in claim 1, characterized in that, The exciter top rod is installed on the exciter platform mounting position via the exciter connector and nut.

3. The exciter push rod as described in claim 2, characterized in that, The sensor is connected via a sensor base.

4. The exciter push rod as described in claim 3, characterized in that, The sensor base ① is a square, lightweight metal block.

5. The exciter push rod as described in claim 4, characterized in that, The two ends of the plastic-coated steel wire rope ② are inserted into the reserved holes at the head of the vibrator connector ③ and the reserved holes in the sensor base ①, respectively, and then sealed with epoxy resin or other adhesive materials.

6. The exciter push rod as described in claim 5, characterized in that, There are two fixing nuts ④. The lower fixing nut ④ is used to fix the exciter top rod to the exciter, and the upper fixing nut ④ is used to prevent the screw of the exciter connecting part ③ from loosening during the excitation test.

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