CN220893735U

CN220893735U - Non-sinusoidal vibration testing device

Info

Publication number: CN220893735U
Application number: CN202322673012.8U
Authority: CN
Inventors: 张�杰; 左宏伟; 沈国振; 王国春; 李培玉
Original assignee: Hangzhou Putedy Industrial Co ltd
Current assignee: Hangzhou Putedy Industrial Co ltd
Priority date: 2023-10-07
Filing date: 2023-10-07
Publication date: 2024-05-03
Anticipated expiration: 2033-10-07

Abstract

The utility model discloses a non-sinusoidal vibration testing device, and relates to the technical field of vibration testing. According to the non-sinusoidal vibration testing device, the servo control unit drives the screw rod in the screw rod lifting mechanism to rotate, so that the rotating motion of the servo motor is converted into the linear reciprocating motion of the internal thread driving piece, and the vibration platform is driven to vibrate up and down through the clamping panel. Meanwhile, the device combines the structures such as the guide rail sliding blocks and the supporting frames, ensures the rigidity of the system and the stability of the lifting platform, can solve the problem that the vibration table is subjected to vibration deflection after being worn for a long time in the testing process, and avoids testing errors. The vibration platform is driven by adopting a servo motor to connect with a screw rod lifting mechanism, different parameters can be set by modifying a PLC, and high-precision diversified vibration control can be realized.

Description

Non-sinusoidal vibration testing device

Technical Field

The utility model relates to the technical field of vibration testing, in particular to a non-sinusoidal vibration testing device.

Background

The crystallizer is used as a core component for continuous casting in a steel mill, and the stability of working vibration of the crystallizer has obvious effects of improving the drawing speed, improving the casting blank quality and the like, so that the vibration detection requirement of the crystallizer is generated.

The non-sinusoidal vibration testing device is used as a device for simulating the vibration of the crystallizer, and has the main function of generating the vibration which is highly similar to that of the crystallizer on site, so that the vibration table does arc-like motion according to given amplitude, frequency and waveform deflection characteristics, and is mainly used as a platform for testing the precision of a vibration detector of the crystallizer.

Taking the equipment for simulating the vibration detection of the crystallizer developed earlier by the applicant as an example (see the patent application number CN201420551989 for a test platform for detecting the vibration of the crystallizer), the vibration platform adopts an upper panel and a lower panel which are connected through a polish rod which is vertically arranged, and the polish rod is connected with a supporting base through a linear bearing. In order to avoid signal errors and generate vibration signals with reliable amplitude, vibration frequency and deflection rate, the stability of the vibration platform must be ensured, which is a problem to be solved at present. Therefore, for such a simulated crystallizer, new mechanical structures need to be developed and designed again.

Disclosure of Invention

Aiming at the defect of the stability of the existing vibration test table, the utility model provides a non-sinusoidal vibration test device.

The specific technical scheme of the utility model is as follows:

A non-sinusoidal vibration testing device comprises a servo control unit and a screw rod vibration unit;

The screw rod vibration unit comprises a support base, a screw rod lifting mechanism and a vibration platform supported on the support base through the screw rod lifting mechanism;

the screw rod lifting mechanism comprises a screw rod, guide rails, an upper bottom plate, screw rod nuts, a lower bottom plate, a sliding block and a clamping panel, wherein the lower bottom plate is horizontally and fixedly arranged on a supporting base, the two guide rails are vertically arranged on the lower bottom plate, and the upper bottom plate is horizontally arranged on the tops of the two guide rails; the two guide rails are respectively provided with a sliding block which forms sliding fit, and the screw rod passes through screw rod nuts fixed on the lower bottom plate and the upper bottom plate to be vertically installed;

the clamping panel is fixedly connected with the sliding blocks on the two guide rails in a mode that the plate surface is vertical, and the vibration platform is horizontally arranged at the top of the clamping panel; an internal thread driving piece is fixed on the clamping panel and sleeved on the screw rod to form a screw pair; the bottom of the screw rod is connected with the servo control unit, and the screw rod can rotate forward and backward around the axis under the drive of the servo control unit, so that the vibration platform is driven to vibrate up and down through the internal thread driving piece and the clamping panel.

Preferably, the servo control unit comprises a PLC, a servo amplifier and a servo motor, wherein the output control end of the PLC is connected with the input control end of the servo amplifier, the output end of the servo amplifier is connected to the power input end of the servo motor, and the output end of the servo motor is connected with the end part of the screw rod through a coupler.

Preferably, the PLC is connected to an adjustment button for controlling the switching of the vibration frequency, the vibration amplitude and the vibration waveform.

Preferably, the screw rod lifting mechanism further comprises a metal transverse plate, and the two guide rails are transversely connected through the metal transverse plate.

Preferably, the screw rod lifting mechanism further comprises a lower support frame, and the lower support frame is arranged between the lower bottom plate and the guide rail to form a triangular stable structure.

Preferably, the screw rod lifting mechanism further comprises an upper supporting frame, and the upper supporting frame is arranged between the clamping panel and the vibration platform to form a triangular stable structure.

Preferably, the lower bottom plate is provided with a limit baffle for limiting the lower limit position of the clamping panel.

Preferably, the non-sinusoidal vibration testing device further comprises an operation platform, and the support base is placed on the operation platform.

Preferably, the operation platform is an operation platform with a horizontal adjustment function.

Preferably, the screw rod lifting mechanism is made of metal materials.

Compared with the prior art, the utility model has the beneficial effects that:

According to the non-sinusoidal vibration testing device, the servo control unit drives the screw rod in the screw rod lifting mechanism to rotate, so that the rotating motion of the servo motor is converted into the linear reciprocating motion of the internal thread driving piece, and the vibration platform is driven to vibrate up and down through the clamping panel. Meanwhile, the device combines the structures such as the guide rail sliding blocks and the supporting frames, ensures the rigidity of the system and the stability of the lifting platform, can solve the problem that the vibration table is subjected to vibration deflection after being worn for a long time in the testing process, and avoids testing errors. According to the utility model, the rapid adjustment of the vibration signal can be realized through the servo control unit, the testing efficiency is improved, the use is convenient, and the testing precision is improved.

Drawings

FIG. 1 is a schematic illustration of a mechanical portion of a non-sinusoidal vibrating table mechanism according to the present utility model;

FIG. 2 is a left side view of a mechanical portion of a non-sinusoidal vibration table mechanism according to the present utility model;

FIG. 3 is a schematic diagram of a driving flow of a non-sinusoidal vibration table system according to the present utility model;

Fig. 4 is a schematic diagram of the electrical control of a non-sinusoidal vibration table according to the present utility model.

The labels in the figures are: 1. an adjustment button; 2. a PLC; 3. a servo amplifier; 4. a servo motor; 5. a coupling; 6. a screw nut; 7. a screw rod lifting mechanism; 8. a vibration platform; 9. a ball screw; 10. a guide rail; 11. a metal cross plate; 12. an upper base plate; 13. a screw nut; 14. a lower base plate; 15. a support base; 16. a lower support frame; 17. an upper support frame; 18. a slide block; 19. clamping the panel; 20. limit baffle, 21 internal thread driving piece.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below. The technical features of the embodiments of the utility model can be combined correspondingly on the premise of no mutual conflict.

In the description of the present utility model, it will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be indirectly connected with intervening elements present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.

In the description of the present utility model, it should be understood that the terms "first" and "second" are used solely for the purpose of distinguishing between the descriptions and not necessarily for the purpose of indicating or implying a relative importance or implicitly indicating the number of features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

In a preferred embodiment of the present utility model, a non-sinusoidal vibration testing apparatus is provided for simulating the vibration state of a mold under actual conditions. The utility model comprises a servo control unit and a screw rod vibration unit, and can realize high-precision diversified vibration control. The utility model concept of the testing device is that a servo motor is connected with a ball screw lifting mechanism for driving, a servo amplifier is controlled by a control system such as a PLC to drive the servo motor to operate, so that the ball screw lifting mechanism is driven to move up and down, and vibration is simulated.

The specific implementation forms and the working principles of the servo control unit and the screw vibration unit in the present utility model are described in detail below.

As shown in fig. 1 and 2, in the embodiment of the present utility model, the above-mentioned screw vibration unit includes a support base 15, a screw elevating mechanism 7, and a vibration table 8 supported on the support base 15 through the screw elevating mechanism 7. The basic components of the screw lifting mechanism 7 comprise a screw 9, a guide rail 10, an upper base plate 12, a screw nut 13, a lower base plate 14, a slider 18 and a clamping panel 19. The support base 15 is used as a mounting base of other components, the lower base plate 14 is horizontally and fixedly mounted on the support base 15, the two guide rails 10 are respectively and vertically mounted on the lower base plate 14, and a certain interval is kept between the two guide rails 10. The upper base plate 12 is horizontally installed on top of the two guide rails 10. The two guide rails 10 are respectively provided with a sliding block 18 which forms sliding fit, and the sliding blocks 18 can move up and down along the corresponding guide rails 10 under the action of external force. A screw nut 13 matched with the screw rod 9 is respectively arranged at the middle positions of the lower base plate 14 and the upper base plate 12, the screw rod 9 penetrates through the screw nut 13 fixed on the lower base plate 14 and the upper base plate 12, and the screw rod 9 is integrally arranged perpendicular to the lower base plate 14 and the upper base plate 12.

In addition, the action of the screw rod 9 provides driving force for the vibration platform 8 to vibrate up and down, and can be realized by adopting a ball screw. The entire vibration table 8 is matched and operated with the screw rod 9 through the clamping panel 19 and the internal thread driving piece 21. The clamping panel 19 is fixedly connected with the sliding blocks 18 on the two guide rails 10, and the clamping panel 19 is installed in a posture that the plate surface is vertical to the horizontal plane and can slide up and down along with the sliding blocks 18. The sliding blocks 18 arranged on the left side and the right side of the guide rail 10 can ensure that the whole lifting mechanism stably slides along the vertical horizontal plane in the up-down running action of the screw rod 9. The vibration table 8 is horizontally mounted on top of the clamping panel 19. An internal thread driving member 21 is fixed to the clamping panel 19, and the internal thread driving member 21 may be a nut having an internal thread or other structural member, and the specific form is not limited. The internal thread driving piece 21 is sleeved on the screw rod 9 to form a screw pair. The self power of the screw rod 9 comes from a servo control unit connected with the bottom of the screw rod 9, and the screw rod 9 can rotate forward and backward around the axis under the drive of the servo control unit, so that the vibration platform 8 is driven to vibrate up and down through the internal thread driving piece 21 and the clamping panel 19. The vibration test platform drives the screw rod to rotate through the servo control unit, the rotary motion of the servo motor is converted into linear reciprocating motion of the internal thread driving piece 21, and then the vibration platform 8 is driven to vibrate up and down through the clamping panel 19.

It should be noted that the above-mentioned servo control unit may be implemented by a common servo drive control mechanism, so long as the rotational speed and direction of the screw rod 9 can be precisely controlled. In the embodiment of the utility model, the servo control unit comprises a PLC2, a servo amplifier 3 and a servo motor 4, wherein the output control end of the PLC2 is connected with the input control end of the servo amplifier 3, the output end of the servo amplifier 3 is connected with the power input end of the servo motor 4, and the output end of the servo motor 4 is connected with the end part of the screw rod 9 through a coupler 5. The servo control unit can adopt a digital control technology, the PLC2 can be arranged through the adjusting button 1 to control the vibration frequency, the vibration amplitude and the vibration waveform switching, and the servo control unit can also be controlled through other UI interfaces or automatic control programs without arranging a physical button. If the servo control unit is divided into a control unit and a servo unit, as shown in fig. 3, the control unit comprises an adjusting button 1, a PLC2, a supporting base 15, a vibration platform 8, a screw lifting mechanism 7 and a signal control flow diagram among the servo unit, which comprises a servo motor 4 and a servo amplifier 3, the test device can output different vibration frequencies, vibration amplitudes and waveform parameters through the PLC2, and the servo amplifier 3 is driven to control the quantity of pulse signals to realize that the servo motor 4 operates at a desired rotating speed, so as to drive the vibration platform to realize non-sinusoidal vibration.

In addition, because the non-sinusoidal vibration testing device has high requirements on precision and stability, in the embodiment of the utility model, a metal transverse plate 11 is further arranged in the screw rod lifting mechanism 7, and the two guide rails 10 are transversely connected through the metal transverse plate 11. Meanwhile, the screw rod lifting mechanism 7 can be further provided with a lower supporting frame 16 and an upper supporting frame 17, the lower supporting frame 16 is installed between the lower bottom plate 14 and the guide rail 10 to form a triangular stable structure, the same upper supporting frame 17 is installed between the clamping panel 19 and the vibration platform 8 to form the triangular stable structure, and then the functional effect of stabilizing the vibration platform 8 is achieved through the triangular structure. The metal cross plate 11 may be directly connected to the two guide rails 10, or may be transversely connected to the lower support frames 16 on the two guide rails 10. The metal cross plate 11 and the slider 18 are mounted on the guide rail 10, and the clamp panel 19 is mounted on the slider 18. With this structure, the guide rail can clamp the lifting mechanism 7 more tightly by fixing screws at a plurality of positions of the clamping panel 19, so as to ensure the rigidity of the system and the stability of the lifting platform. Therefore, the screw rod lifting mechanism 7 is installed on the guide rail by adopting the sliding block and the triangular support frame, the straightness of the guide rail is kept within 5 wires, the parallelism is kept within 1 wire, the sliding block has the automatic aligning capability, and even if the mechanism is subjected to vibration interference and pre-pressing, certain errors can be absorbed, so that the linear motion with high precision, smoothness and stability can be obtained. In the embodiment of the utility model, in order to simulate the working environments of different continuous casting crystallizers, the non-sinusoidal vibration testing device can meet the following working characteristics: the range of vibration amplitude h is: h is more than or equal to 1 and less than or equal to 8mm; the range of the vibration frequency f is: f is more than or equal to 0 and less than or equal to 420cpm; the range of the bias rate is as follows: 0-30%.

In addition, since the mechanical part of the screw lifting mechanism 7 vibrates up and down as a whole, in order to prevent the clamping panel 19 from touching the lower plate 14 during the up and down vibration, a limit stop 20 may be provided on the lower plate 14 for limiting the lower limit position of the clamping panel 19. A proximity switch may be provided on the limit stop 20 to feedback control the servo motor.

In addition, the non-sinusoidal vibration testing device may further be provided with an operation platform, on which the support base 15 is placed. And the operation platform is preferably an operation platform with a horizontal adjustment function, so that the operation platform can be horizontally adjusted, and the whole vibration detection platform is ensured to be in a horizontal position.

In addition, the screw rod lifting mechanism 7 can be made of metal materials, for example, the guide rail sliding block and the supporting frame can be made of metal materials, so that the structural rigidity is improved, and the problem that the vibration table is subjected to vibration deflection after being worn for a long time in the testing process is solved.

It should be noted that, the specific control mode, that is, the specific vibration mode of the non-sinusoidal vibration testing device needs to be designed according to the actual testing requirement. In an embodiment of the present utility model, a preferred control manner of the non-sinusoidal vibration testing apparatus is further provided. The amplitude, the vibration frequency and the waveform are set through the adjusting button 1, a signal is output to the servo amplifier 3 through the PLC2, the servo motor 4 is driven, the ball screw 9 is driven to rotate through the coupler 5 after the servo motor 4 runs, the ball screw 9 is matched with the screw nut 13 arranged on the screw lifting mechanism 7, and the rotation of the ball screw 9 drives the sliding block 18 and the vibration platform 8 to float up and down. The upper supporting frame 17 and the lower supporting frame 16 ensure that the lifting platform does not incline when lifting, and the stability of vibration is improved. The relevant parameters of the PLC2 to the servo amplifier 3 include pulse number, pulse frequency, and forward/reverse rotation command for controlling the forward/reverse rotation and the rotation speed and stop position of the servo motor 4.

In one embodiment of the present utility model, the control circuit of the non-sinusoidal vibration testing apparatus may employ the control method as shown in fig. 4, and the control method is further described below in conjunction with the figure: firstly, the PLC is externally connected with a 220V alternating current power supply, and power supply is controlled through a switch. Four keys are arranged below the debugging button 1 panel: reset, start/stop, rise and fall. The reset button is used for restoring the vibrating table to the original position. The start/stop button is used to start and stop the servo motor 4 and display the current state. The up and down buttons are used for controlling the up and down of the vibrating table in a point-to-point mode, and the position of the vibrating table is controlled when special requirements exist. The upper left corner of the panel is a sine/non-sine button, and the LED lamp on the right side of the button indicates the output waveform state. The frequency and amplitude keys are input through 138 decoders to realize vibration frequency and amplitude switching. The limit switch is mounted on the limit stop 20 for triggering the rising signal.

In the control circuit, the PLC2 is connected with a port of the servo amplifier 3 through a special connecting wire, and CN1 is a socket for inputting signals and is used for providing a DC24V working power supply and inputting pulse signals in an open collector mode. When the servo motor is operated, the forward and reverse stroke terminals are short-circuited with the public end, and if the circuit is disconnected, the servo motor is suddenly stopped and locked. When the PLC2 is connected to the servo amplifier 3 in an open collector manner, a forward pulse train and a reverse pulse train are formed between the terminals to drive the servo motor 4 to operate. CN2 is the socket for the encoder, uses the special line to be connected with servo motor 4, realizes servo motor 4 function of testing speed to real-time control motor rotational speed guarantees vibration signal's stability.

The above embodiments are only preferred embodiments of the present utility model, but are not intended to limit the present utility model. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present utility model. Therefore, all the technical schemes obtained by adopting the equivalent substitution or equivalent transformation are within the protection scope of the utility model.

Claims

1. The non-sinusoidal vibration testing device is characterized by comprising a servo control unit and a screw rod vibration unit;

The screw rod vibration unit comprises a supporting base (15), a screw rod lifting mechanism (7) and a vibration platform (8) supported on the supporting base (15) through the screw rod lifting mechanism (7);

The screw rod lifting mechanism (7) comprises a screw rod (9), guide rails (10), an upper bottom plate (12), screw rod nuts (13), a lower bottom plate (14), a sliding block (18) and a clamping panel (19), wherein the lower bottom plate (14) is horizontally and fixedly arranged on a supporting base (15), two guide rails (10) are vertically arranged on the lower bottom plate (14), and the upper bottom plate (12) is horizontally arranged at the tops of the two guide rails (10); the two guide rails (10) are respectively provided with a sliding block (18) which forms sliding fit, and the screw rod (9) is vertically installed through a screw rod nut (13) which is fixed on the lower bottom plate (14) and the upper bottom plate (12);

The clamping panel (19) is fixedly connected with the sliding blocks (18) on the two guide rails (10) in a mode that the plate surface is vertical, and the vibration platform (8) is horizontally arranged at the top of the clamping panel (19); an internal thread driving piece (21) is fixed on the clamping panel (19), and the internal thread driving piece (21) is sleeved on the screw rod (9) to form a screw pair; the bottom of the screw rod (9) is connected with the servo control unit, and the screw rod (9) can rotate forward and backward around the axis under the drive of the servo control unit, so that the vibration platform (8) is driven to vibrate up and down through the internal thread driving piece (21) and the clamping panel (19).

2. The non-sinusoidal vibration testing device according to claim 1, wherein the servo control unit comprises a PLC (2), a servo amplifier (3) and a servo motor (4), an output control end of the PLC (2) is connected with an input control end of the servo amplifier (3), an output end of the servo amplifier (3) is connected to a power input end of the servo motor (4), and an output end of the servo motor (4) is connected with an end portion of the screw rod (9) through a coupling (5).

3. The non-sinusoidal vibration testing device according to claim 2, characterized in that the PLC (2) is connected to an adjustment button (1) for controlling the vibration frequency, the vibration amplitude and the switching of the vibration waveform.

4. The non-sinusoidal vibration testing device according to claim 1, characterized in that the screw lifting mechanism (7) further comprises a metal cross plate (11), the two guide rails (10) being laterally coupled by the metal cross plate (11).

5. The non-sinusoidal vibration testing device according to claim 1, wherein the screw elevating mechanism (7) further comprises a lower support frame (16), and the lower support frame (16) is installed between the lower base plate (14) and the guide rail (10) to form a triangle stabilizing structure.

6. The non-sinusoidal vibration testing device according to claim 1, wherein the screw lifting mechanism (7) further comprises an upper support frame (17), the upper support frame (17) being mounted between the clamping panel (19) and the vibration platform (8) to form a triangular stabilizing structure.

7. The non-sinusoidal vibration testing device according to claim 1, characterized in that the lower base plate (14) is provided with a limit stop (20) for limiting the lower limit position of the clamping panel (19).

8. The non-sinusoidal vibration testing device according to claim 1, further comprising an operating platform on which the support base (15) is placed.

9. The non-sinusoidal vibration testing device of claim 8, wherein the operating platform is an operating platform with a level adjustment function.

10. A non-sinusoidal vibration testing device according to claim 1, characterized in that the screw lifting mechanism (7) is of metallic material.