Trapezoidal lead screw vibration noise measuring device

Abstract

The utility model discloses a trapezoidal lead screw vibration noise measuring device, which comprises a measuring chamber and a detection table, and the detection table is arranged in the measuring chamber. The detection table comprises an equipment installation base, bottom feet are arranged on the bottom face of the equipment installation base, and a driving mechanism, a loading mechanism and a transmission mechanism are installed on the top face of the equipment installation base. According to the utility model, the noise level of the trapezoidal lead screw can be accurately evaluated.

Description

Technical Field

[0001] The utility model belongs to the technical field of noise measurement, in particular to a trapezoidal lead screw vibration noise measuring device. Background Art

[0002] The lead screw is mainly composed of a lead screw and a nut. It is a commonly used transmission element, mainly used to convert rotational motion into linear motion, or convert linear motion into rotational motion.

[0003] Since there is a clearance fit between the nut and the screw of the trapezoidal lead screw, if the clearance is too large during power transmission, it will cause transient impact. If the clearance is too small, it will cause installation difficulties and occasional abnormal noises during movement.

[0004] Currently, the vibration and noise detection method of a lead screw is mainly to place the lead screw in an environment without any acoustic treatment and measure its vibration level with a vibration sensor, which is unable to accurately assess the noise level of the lead screw.

[0005] Therefore, how to solve the defects of the above-mentioned prior art has become the direction of efforts of technicians in this field. Utility Model Content

[0006] The purpose of the utility model is to provide a trapezoidal lead screw vibration noise measuring device, which can completely solve the shortcomings of the above-mentioned prior art.

[0007] The purpose of the utility model is achieved through the following technical solutions:

[0008] A device for measuring vibration and noise of a trapezoidal screw comprises a measuring chamber and a detection platform, wherein the detection platform is installed in the measuring chamber; the measuring chamber comprises a measuring chamber shell and an acoustic packaging layer, wherein the measuring chamber shell is installed on a foundation, the acoustic packaging layer is arranged on the inner wall of the measuring chamber shell, and a sound absorbing material is filled between the acoustic packaging layer and the measuring chamber shell;

[0009] The testing platform comprises an equipment mounting base, a foot is provided on the bottom surface of the equipment mounting base, and a driving mechanism, a loading mechanism and a transmission mechanism are installed on the top surface of the equipment mounting base; the driving mechanism comprises a driving motor, the driving motor is fixed to the equipment mounting base through a driving motor bracket, and a sound insulation cover is installed outside the driving motor;

[0010] The loading mechanism includes a loading motor and a reduction box, the loading motor is installed on the equipment installation base through a loading motor bracket, the reduction box is installed on the equipment installation base through a reduction box bracket, and the loading motor bracket and the reduction box bracket are connected to each other, a sound insulation cover is installed outside the loading motor, the output end of the loading motor is connected to the reduction box, and a nut fixing device is provided on the top of the reduction box;

[0011] The transmission mechanism includes a coupling, a front bearing seat, a rear bearing seat, a front bearing seat bracket, a rear bearing seat bracket and a locking device. The loading mechanism is arranged between the front and rear bearing seats. The front bearing seat is fixed to the equipment mounting base through the front bearing seat bracket. A slide rail is laid on the equipment mounting base. The rear bearing seat is slidably mounted on the slide rail through the rear bearing seat bracket. Sound insulation covers are installed outside the front and rear bearing seats. A connecting shaft is installed at one end of the front bearing seat and a locking device is installed at the other end. The output end of the driving motor is connected to the connecting shaft through a coupling, and a locking device is correspondingly installed at the end of the rear bearing seat opposite to the front bearing seat.

[0012] Furthermore, a speed measuring device is arranged between the driving mechanism and the front bearing seat. The speed measuring device is fixed to the equipment mounting base through a speed measuring device bracket. The input end of the speed measuring device is connected to the output end of the driving motor through a coupling, and the output end of the speed measuring device is connected to the connecting shaft through a coupling.

[0013] Furthermore, the acoustic packaging layer is a honeycomb structure.

[0014] Furthermore, the sound absorbing material is glass wool felt, glass fiber, slag wool or foam plastic.

[0015] Furthermore, the height between the top surface of the equipment installation base and the foundation is 0.8m.

[0016] Furthermore, a shock-absorbing rubber pad is installed at the bottom end of the base.

[0017] Furthermore, the locking device is a mechanical chuck.

[0018] Furthermore, a screw is fixed between the front and rear bearing seats by a locking device, the thread on the screw cooperates with a nut, and the nut is located in the middle of the screw, and a first microphone, a second microphone and a third microphone are respectively arranged on the left side, right side and upper side of the nut at a distance of 1 m from the outer surface of the nut, and a fourth microphone is arranged at a distance of 0.1 m from the outer surface of the nut, and a vibration sensor is pasted on the surface of the nut.

[0019] Furthermore, the vibration sensor, the first microphone and the second microphone are located on the same horizontal plane.

[0020] Compared with the prior art, the utility model has the beneficial effects of simple structure, reasonable design and the ability to accurately evaluate the noise level of the trapezoidal lead screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model;

[0022] Figure 2 It is a connection relationship diagram of the driving mechanism, the loading mechanism and the transmission mechanism in the utility model;

[0023] Figure 3 It is a layout diagram of the utility model when measuring the vibration noise of a trapezoidal lead screw. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with specific embodiments and drawings.

[0025] like Figures 1 to 3 As shown, a trapezoidal screw vibration noise measuring device includes a measuring room 1 and a test bench 2, and the test bench 2 is installed in the measuring room 1; the measuring room 1 includes a measuring room shell 101 and an acoustic packaging layer 102, the measuring room shell 101 is installed on the foundation, the measuring room shell 101 is made of metal material, the acoustic packaging layer 102 is arranged on the inner wall of the measuring room shell 101, and a sound absorbing material 103 is filled between the acoustic packaging layer 102 and the measuring room shell 101; the acoustic packaging layer 102 is a honeycomb structure. The sound absorbing material 103 is glass wool felt, glass fiber, slag wool or foam plastic. The internal space of the measuring room 1 is a rectangular space, and its length, width and height are: 4.2m, 4.2m, 4m.

[0026] The test bench 2 includes an equipment installation base 201, and a foot 202 is provided on the bottom surface of the equipment installation base 201. In order to improve the vibration reduction effect, a shock-absorbing rubber pad is installed at the bottom of the foot 202. The height between the top surface of the equipment installation base 201 and the foundation is 0.8m. The purpose of this design is to reduce the influence of ground reflection during noise measurement. A driving mechanism, a loading mechanism and a transmission mechanism are installed on the top surface of the equipment installation base 201; the driving mechanism includes a driving motor 3, which is fixed to the equipment installation base 201 through a driving motor bracket 4, and a sound insulation cover 10 is installed outside the driving motor 3.

[0027] The loading mechanism includes a loading motor 5 and a reduction box 6. The loading motor 5 is mounted on the equipment mounting base 201 through a loading motor bracket 7. The reduction box 6 is mounted on the equipment mounting base 201 through a reduction box bracket 8. The loading motor bracket 7 and the reduction box bracket 8 are connected to each other. A sound insulation cover is installed outside the loading motor 5. The output end of the loading motor 5 is connected to the reduction box 6. A nut fixing device 9 is provided at the top of the reduction box 6. The above-mentioned loading mechanism is an existing mature technology. The loading motor 5 provides power to drive the loading mechanism to apply the required load to the lead screw 21. The loading motor bracket 7 and the reduction box bracket 8 are both slidably fitted on the slide rail 17.

[0028] The transmission mechanism includes a coupling 11, a front bearing seat 12, a rear bearing seat 13, a front bearing seat bracket 14, a rear bearing seat bracket 15 and a locking device 16. The loading mechanism is arranged between the front and rear bearing seats 12 and 13. The front bearing seat 12 is fixed to the equipment installation base 201 through the front bearing seat bracket 14. A slide rail 17 is laid on the equipment installation base 201. The rear bearing seat 13 is slidably installed on the slide rail 17 through the rear bearing seat bracket 15. A positioning mechanism is provided on the rear bearing seat bracket 15. When the rear bearing seat bracket 15 moves to a required position on the slide rail 17, the positioning is achieved through the positioning mechanism. The positioning mechanism can be a positioning bolt. Soundproof covers are installed outside the front and rear bearing seats 12 and 13. A connecting shaft 18 is installed at one end of the front bearing seat 12, and a locking device 16 is installed at the other end. The output end of the drive motor 3 is connected to the connecting shaft 18 through the coupling 11. The locking device 16 is correspondingly installed at the end of the rear bearing seat 13 opposite to the front bearing seat 12. The locking device 16 is a mechanical chuck, and the connecting shaft 18 is connected to the mechanical chuck.

[0029] A speed measuring device 19 is provided between the driving mechanism and the front bearing seat 12. The speed measuring device 19 is fixed on the equipment mounting base 201 through a speed measuring device bracket 20. The input end of the speed measuring device 19 is connected to the output end of the driving motor 3 through a coupling 11, and the output end of the speed measuring device 19 is connected to the connecting shaft 18 through a coupling 11. In this embodiment, the speed measuring device 19 is a speed sensor, which can be selected from electromagnetic, Hall effect or photoelectric types according to actual needs.

[0030] When measuring the vibration noise of the trapezoidal screw, the three-point method is used to measure the sound pressure level at different positions. The screw 21 is fixed between the front and rear bearing seats 12 and 13 by a locking device 16. The thread on the screw 21 cooperates with the nut, and the nut is located in the middle position of the screw 21. The first microphone 22, the second microphone 23 and the third microphone 24 are respectively arranged on the left side, the right side and the upper side of the nut 26 at a distance of 1m from the outer surface of the nut. The fourth microphone 25 is arranged at a distance of 0.1m from the outer surface of the nut. A vibration sensor is pasted on the surface of the nut to measure the vibration level of the trapezoidal screw, and the vibration sensor is located on the same horizontal plane as the first microphone 22 and the second microphone 23.

[0031] The utility model can accurately evaluate the noise level of the trapezoidal screw. The utility model adopts a simple silent chamber, which is more cost-effective than a semi-anechoic chamber and has a strong engineering application value. It can quickly perform acoustic tests and provide timely feedback for product development and improvement, which is conducive to shortening the product development cycle. Adding sound insulation measures at the position of the main rotating parts can more accurately evaluate the noise level of the trapezoidal screw. The utility model adds a high-precision speed measurement device at the drive end to accurately analyze the speed fluctuation level of the transmission system, and at the same time can realize a comprehensive qualitative analysis of the trapezoidal screw.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A trapezoidal screw vibration noise measuring device, characterized in that: It includes a measuring room and a testing table, and the testing table is installed in the measuring room; The measuring chamber comprises a measuring chamber shell and an acoustic packaging layer, wherein the measuring chamber shell is installed on a foundation, the acoustic packaging layer is arranged on an inner wall of the measuring chamber shell, and a sound absorbing material is filled between the acoustic packaging layer and the measuring chamber shell; The testing platform comprises an equipment installation base, a foot is arranged on the bottom surface of the equipment installation base, and a driving mechanism, a loading mechanism and a transmission mechanism are installed on the top surface of the equipment installation base; The driving mechanism comprises a driving motor, which is fixed to the equipment mounting base via a driving motor bracket, and a sound insulation cover is installed outside the driving motor; The loading mechanism includes a loading motor and a reduction box, the loading motor is installed on the equipment installation base through a loading motor bracket, the reduction box is installed on the equipment installation base through a reduction box bracket, and the loading motor bracket and the reduction box bracket are connected to each other, a sound insulation cover is installed outside the loading motor, the output end of the loading motor is connected to the reduction box, and a nut fixing device is provided on the top of the reduction box; The transmission mechanism includes a coupling, a front bearing seat, a rear bearing seat, a front bearing seat bracket, a rear bearing seat bracket and a locking device. The loading mechanism is arranged between the front and rear bearing seats. The front bearing seat is fixed to the equipment mounting base through the front bearing seat bracket. A slide rail is laid on the equipment mounting base. The rear bearing seat is slidably mounted on the slide rail through the rear bearing seat bracket. Sound insulation covers are installed outside the front and rear bearing seats. A connecting shaft is installed at one end of the front bearing seat and a locking device is installed at the other end. The output end of the driving motor is connected to the connecting shaft through a coupling, and a locking device is correspondingly installed at the end of the rear bearing seat opposite to the front bearing seat.

2. The trapezoidal screw vibration noise measuring device according to claim 1, characterized in that: A speed measuring device is arranged between the driving mechanism and the front bearing seat. The speed measuring device is fixed to the equipment mounting base through a speed measuring device bracket. The input end of the speed measuring device is connected to the output end of the driving motor through a coupling, and the output end of the speed measuring device is connected to the connecting shaft through a coupling.

3. The trapezoidal screw vibration noise measuring device according to claim 1, characterized in that: The acoustic packaging layer is a honeycomb structure.

4. The trapezoidal screw vibration noise measuring device according to claim 3, characterized in that: The sound absorbing material is glass wool felt, glass fiber, slag wool or foam plastic.

5. The trapezoidal screw vibration noise measuring device according to claim 4, characterized in that: The height between the top surface of the equipment installation base and the foundation is 0.8m.

6. The trapezoidal screw vibration and noise measuring device according to claim 5, characterized in that: A shock-absorbing rubber pad is installed at the bottom end of the foot.

7. The trapezoidal screw vibration noise measuring device according to claim 6, characterized in that: The locking device is a mechanical chuck.

8. The trapezoidal screw vibration and noise measuring device according to any one of claims 1 to 7, characterized in that: A locking device is used to fix the lead screw between the front and rear bearing seats. The thread on the lead screw cooperates with a nut, and the nut is located in the middle of the lead screw. The first, second and third microphones are respectively arranged on the left side, right side and upper side of the nut at a distance of 1m from the outer surface of the nut. The fourth microphone is arranged at a distance of 0.1m from the outer surface of the nut, and a vibration sensor is pasted on the surface of the nut.

9. The trapezoidal lead screw vibration and noise measuring device according to claim 8, characterized in that: The vibration sensor is located on the same horizontal plane as the first microphone and the second microphone.

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