Vibration switch calibration platform and calibration method

Abstract

The invention discloses a vibration switch calibration platform and calibration method. The vibration switch calibration platform comprises an outer platform, an inner platform, a spring and a vibration motor. The size of the inner platform is smaller than that of the outer platform, the inner platform is located in the center inside the outer platform, and eight corners outside the inner platform are connected with eight corners inside the outer platform through springs. A vibration motor and a vibration sensor are arranged on the inner platform, an eccentric wheel is connected to an output shaft of the vibration motor, and a balance weight is arranged on the eccentric wheel; and the vibration sensor is arranged on the same or parallel plane of the inner platform and the vibration motor. Accurate online calibration of the vibration switch under a standard allowable limit intensity working condition is realized.

Description

Technical Field

[0001] The invention belongs to the field of vibration switches and relates to a vibration switch calibration platform and a calibration method. Background Art

[0002] The magnetic vibration switch installed on the compressor is a safety protection device for the unit. The abnormal vibration generated by the equipment before a serious failure will cause the vibration switch to disconnect, and the signal will be transmitted to the control system of the unit to cut off the fuel gas for emergency shutdown to avoid further damage to the safety protection device.

[0003] The magnetic vibration switch adjusts the magnetic force by adjusting the gap between the adjusting screw and the magnetic head inside the switch to control the switch trip value. Currently, there is no standard vibration switch calibration method in the industry. The gap between the magnetic head and the screw is adjusted on-site based on experience, and then the switch is disconnected and tripped by hitting with a hammer. This method will have a large deviation in the applied force due to human operation and other reasons, and there is no standard theoretical data as a theoretical support. Therefore, there will inevitably be a large deviation between the calibration of the switch and the expected value, which will cause the switch to fail to trip normally when it needs to work, the protection function will fail, and the shutdown protection function in the early stage of equipment abnormality cannot be realized. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a vibration switch calibration platform and calibration method to achieve accurate online calibration of the vibration switch under standard allowable extreme intensity working conditions.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A vibration switch calibration platform, comprising an outer platform, an inner platform, a spring and a vibration motor;

[0007] The inner platform is smaller than the outer platform and is located at the center of the outer platform. The eight corners of the inner platform are connected to the eight corners of the outer platform by springs.

[0008] A vibration motor and a vibration sensor are arranged on the inner platform. An eccentric wheel is connected to the output shaft of the vibration motor, and a counterweight is arranged on the eccentric wheel. The vibration sensor is arranged on the same plane as or parallel to the vibration motor on the inner platform.

[0009] Preferably, threaded rods are provided at the eight corners inside the outer platform, and the threaded rods are inclined toward the eight corners outside the corresponding inner platform. The spring and the threaded rod are connected by a spring preload adjustment device, and a threaded hole is provided at one end of the spring preload adjustment device toward the threaded rod.

[0010] Furthermore, the spring preload force adjustment device is connected to a rotating rod rotatably toward one end of the spring, and a ring is provided at the end of the rotating rod, and the ring is sleeved on the spring.

[0011] Preferably, the eccentric wheel is provided with a radial elongated through hole, and the counterweight comprises a bolt and a nut, and the bolt passes through the elongated through hole and is threadedly connected with the nut.

[0012] Preferably, the eccentric wheel may also be provided with a plurality of through holes in the radial direction, and the counterweight includes bolts and nuts, and the bolts pass through the through holes and are threadedly connected with the nuts.

[0013] Preferably, the number of vibration motors is one to three. If there are multiple vibration motors, they are respectively arranged on planes in different directions of the inner platform, and the number and positions of vibration sensors correspond to the number and positions of vibration motors.

[0014] Preferably, a switch installation panel is provided on the outside of the inner platform, and a connection hole corresponding to the vibration switch installation hole is provided on the switch installation panel.

[0015] Preferably, a data processing device is provided on the external platform, the output end of the vibration sensor is connected to the data processing device, and the data processing device is connected to a host computer.

[0016] A calibration method based on the vibration switch calibration platform comprises the following steps: installing the vibration switch on an inner platform, adjusting the magnetic attraction adjustment knob of the vibration switch to the maximum magnetic attraction value, turning on the vibration motor to drive the inner platform to vibrate, adjusting the rotation speed of the vibration motor to control the vibration intensity, obtaining the current vibration value of the inner platform through a vibration sensor, adjusting the vibration intensity of the inner platform to the vibration limit value of the vibration switch required by the standard, fine-tuning the magnetic attraction adjustment knob of the vibration switch, reducing the magnetic force value of the switch adsorption, until the switch in the vibration switch starts to trip, and completing the calibration.

[0017] Preferably, vibration data is collected by a vibration sensor, and the collected vibration numerical signal is converted into a current signal through a conversion module, transmitted to a data processing device for processing, and then uploaded to a host computer. The host computer is provided with a display panel to match the data processed by the data processing device and display the specific vibration numerical value.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention connects the inner platform and the outer platform by using a spring so that the inner platform is in a suspended state, thereby maximizing the vibration intensity. The inner platform is driven to vibrate by a vibration motor, and the vibration value of the inner platform is obtained by a vibration sensor. The vibration intensity is controlled by adjusting the rotation speed of the vibration motor, and the starting point of the vibration switch is adjusted to achieve calibration of the vibration switch under different vibration intensities. The vibration calibration platform has a reasonable structure and stable performance, and is suitable for simulating operating conditions of equipment at different positions. It is benchmarked against the extreme vibration intensity allowed by the current national standard to form a stable equipment operating condition at the allowable extreme vibration intensity, and is used for installation calibration of magnetic vibration switches to achieve a standard and reliable calibration method.

[0020] Furthermore, the spring preload adjustment device is used to control the extension and contraction degree of the spring device, adjust the force level of the inner platform, and thus adjust the vibration intensity of the inner platform.

[0021] Furthermore, the rotating rod is rotatably connected to the spring preload force adjusting device, which can offset the rotation of the threaded hole when it is threadedly connected to the threaded rod, thereby avoiding damage to the spring.

[0022] Furthermore, the bolt is moved along the length direction of the long strip through hole, so that the vibration intensity is changed by the difference in the magnitude of the centrifugal force.

[0023] Furthermore, by installing bolts and nuts at through holes at different positions, the vibration intensity can be changed by varying the magnitude of the centrifugal force.

[0024] Further, multiple vibration motors can generate vibrations from different directions.

[0025] Furthermore, providing a switch installation panel enables quick installation or removal of the vibration switch, thereby improving calibration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A three-dimensional diagram of the vibration switch calibration platform of the present invention;

[0027] Figure 2 It is a side view of the vibration switch calibration platform of the present invention;

[0028] Figure 3 It is a rear view of the vibration switch calibration platform of the present invention;

[0029] Figure 4 It is a front view of the vibration switch calibration platform of the present invention.

[0030] Among them: 1-outer platform; 2-inner platform; 3-spring; 4-spring preload adjustment device; 5-vibration motor; 6-eccentric wheel; 7-counterweight; 8-vibration sensor; 9-vibration switch; 10-data processing device; 11-motor speed control knob; 12-opening and closing status indicator light. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0034] like Figure 1 As shown, the vibration switch calibration platform of the present invention includes an outer platform 1, an inner platform 2, a spring 3 and a vibration motor 5.

[0035] The outer platform 1 is a rectangular parallelepiped frame structure. The use of the frame structure can reduce the overall weight of the platform and reduce costs.

[0036] The inner platform 2 is a rectangular structure with a size smaller than that of the outer platform 1. It is located at the center of the outer platform 1. The eight corners on the outside of the inner platform 2 are connected to the eight corners on the inside of the outer platform 1 by springs 3, so that the inner platform 2 is in a suspended state, maximizing the vibration intensity.

[0037] The eight corners inside the outer platform 1 are all provided with threaded rods, and the threaded rods are all inclined toward the eight corners outside the corresponding inner platform 2. The spring 3 and the threaded rod are connected by a spring preload adjustment device 4. The spring preload adjustment device 4 is an elliptical ring structure, one end of which is rotatably connected with a rotating rod, the end of the rotating rod is provided with a ring, and the other end is provided with a threaded hole, and the threaded rod is threadedly connected. The rotating rod is rotatably connected to the spring preload adjustment device, which can offset the rotation of the threaded hole and the threaded rod when they are threadedly connected, and avoid damage to the spring 3.

[0038] Hooks are provided at both ends of the spring 3, and connecting rings are provided at the eight corners outside the inner platform 2. One end of the spring 3 is hooked on the connecting ring, and the other end is hooked on the ring, which makes it convenient to hang or remove the spring 3 from the outer platform 1 and the inner platform 2.

[0039] The inner platform 2 is hollow inside, and a vibration motor 5 is arranged inside. An eccentric wheel 6 is arranged on the output shaft of the vibration motor 5. The output shaft of the vibration motor 5 is connected to the eccentric position of the eccentric wheel 6. A counterweight 7 is arranged on the eccentric wheel 6 to generate vibration through centrifugal force.

[0040] The eccentric wheel 6 is provided with a radial long strip through hole, and the counterweight 7 includes a bolt and a nut. The bolt passes through the long strip through hole and is threadedly connected to the nut. The bolt head and the nut are respectively clamped on both sides of the eccentric wheel 6, so that the counterweight 7 is fixed. When the vibration intensity needs to be adjusted, it can be achieved by adjusting the position of the counterweight 7, loosening the nut a little, and moving the bolt along the length direction of the long strip through hole, thereby changing the vibration intensity through the difference in centrifugal force.

[0041] Another way of counterweight 7 is that a plurality of through holes can be radially arranged on the eccentric wheel 6, and the counterweight 7 includes bolts and nuts. The bolts pass through the through holes and are threadedly connected to the nuts. The bolt heads and nuts are respectively clamped on both sides of the eccentric wheel 6, so that the counterweight 7 is fixed. When the vibration intensity needs to be adjusted, it can be achieved by adjusting the position of the counterweight 7, removing the nuts, and installing the bolts and nuts at the through holes at different positions, thereby changing the vibration intensity through the difference in centrifugal force.

[0042] The number of the vibration motors 5 is one to three. If there are multiple vibration motors 5, they are respectively arranged on planes in different directions of the inner platform 2 to generate vibrations from different directions.

[0043] The inner platform 2 is also provided with the same number of vibration sensors 8 as the number of the vibration motors 5 for collecting vibration data. The vibration sensors 8 are arranged on the same or parallel plane of the inner platform 2 and the corresponding vibration motors 5 .

[0044] A switch installation panel is provided on the outside of the inner platform 2 for installing the vibration switch 9. The switch installation panel is provided with connection holes corresponding to the installation holes of the vibration switch 9, so that the switch installation panel can quickly install or remove the vibration switch 9, thereby improving efficiency.

[0045] The vibration switch 9 is provided with a magnetic attraction adjustment knob for adjusting the magnetic force value of the switch adsorption inside the vibration switch 9, thereby affecting the vibration intensity value corresponding to the disconnection of the vibration switch 9.

[0046] A data processing device 10 is provided on the outer platform 1. The data processing device 10 has a motor speed control knob 11 and an opening and closing status indicator light 12. The motor speed control knob 11 is connected to the vibration motor 5 and is used to control the rotation speed of the vibration motor 5, thereby controlling the vibration intensity. The opening and closing status indicator light 12 is connected to the vibration switch 9 and is used to display the opening and closing status of the vibration switch 9.

[0047] In this embodiment, the data processing device 10 adopts PLC, the output end of the vibration sensor 8 is connected to the PLC through a data line, and the PLC is connected to a host computer through a data line.

[0048] The vibration switch 9 is installed on the switch installation panel, and the magnetic attraction adjustment knob of the vibration switch 9 is adjusted to the maximum magnetic attraction value. The data line connects the host computer and the data processing device 10, and the power of the data processing device 10 is turned on. At this time, the counterweight 7 adjustment module is adjusted to adjust the centrifugal force of the eccentric device, and the spring preload adjustment device 4 is adjusted to control the extension and contraction degree of the spring 3 device, and adjust the force degree of the inner platform 2. At this time, the rotation speed of the vibration motor 5 is controlled by the motor speed control knob 11. Through the above three methods, the vibration intensity of the inner platform 2 is adjusted. The vibration data of the inner platform 2 is collected by the vibration sensor 8, transmitted to the data processing device 10 for processing, and then uploaded to the host computer monitoring screen via the data line to display the actual vibration intensity value, and the vibration intensity of the inner platform 2 is adjusted to the set target value. The target value is the working condition when the vibration limit value of the vibration switch 9 required by the standard is reached. The magnetic attraction adjustment knob of the vibration switch 9 is fine-tuned to adjust the gap between the adjusting screw and the magnetic attraction head, and the magnetic force value adsorbed by the switch is reduced until the switch in the vibration switch 9 is tripped, and the opening and closing status indicator light 12 lights up, and the calibration is completed.

[0049] The vibration data is collected by the vibration sensor 8, and the collected vibration value signal is converted into a current signal through a conversion module, transmitted to the PLC for processing, and then connected to the host computer via a network cable. The host computer makes a display panel that matches the data processed by the PLC and can display a specific vibration value in mm / s. A power module is also provided, which converts 220V AC into 22V DC to power the PLC and the vibration switch 9.

[0050] This vibration calibration platform has a reasonable structure and stable performance. It is suitable for simulating operating conditions at different locations of the equipment. It is benchmarked against the ultimate vibration intensity allowed by the current national standard to form a stable equipment operating condition at the allowable ultimate vibration intensity. It is used for installation calibration of magnetic vibration switches to achieve a standard and reliable calibration method.

[0051] By adjusting the platform frame parameters, the vibration intensity can be adjusted within the range of 3 to 25 mm / s. At the same time, the upper computer vibration intensity can be displayed online. The national standard allows data adjustment to set the platform vibration intensity. The platform can simulate the vibration of the equipment under different working conditions. The switch is installed on the platform to adjust the magnetic adjustment screw to realize the switch start and disconnection, completing the reasonable calibration of the vibration switch 9.

[0052] The present invention is aimed at the method of calibrating the vibration switch 9 in the industry without a standard. A vibration platform that can realize free adjustment of vibration intensity is developed. The allowable limit values ​​of vibration intensity for specific parts of various types of equipment are referred to the current national standard, and the operating conditions of the equipment at the allowable limit values ​​of vibration are simulated. The vibration switch 9 is installed on the platform and the adjustment knob inside the switch is adjusted to disconnect the switch, which can realize accurate online calibration of the vibration switch 9 under the standard allowable limit intensity conditions.

[0053] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0054] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the foregoing claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A vibration switch calibration platform, characterized in that: It comprises an outer platform (1), an inner platform (2), a spring (3) and a vibration motor (5); The inner platform (2) is smaller than the outer platform (1) and is located at the center of the outer platform (1). The eight corners outside the inner platform (2) are connected to the eight corners inside the outer platform (1) by springs (3). A vibration motor (5) and a vibration sensor (8) are arranged on the inner platform (2); an eccentric wheel (6) is connected to the output shaft of the vibration motor (5); and a counterweight (7) is arranged on the eccentric wheel (6); and the vibration sensor (8) is arranged on the inner platform (2) on a plane that is the same as or parallel to the vibration motor (5).

2. The vibration switch calibration platform according to claim 1, characterized in that: The eight corners inside the outer platform (1) are all provided with threaded rods, and the threaded rods are all inclined toward the eight corners outside the corresponding inner platform (2). The spring (3) and the threaded rod are connected by a spring preload adjustment device (4), and the spring preload adjustment device (4) is provided with a threaded hole at one end of the threaded rod.

3. The vibration switch calibration platform according to claim 2, characterized in that: The spring preload force adjustment device (4) is rotatably connected to one end of the spring (3) with a rotating rod, and a circular ring is arranged at the end of the rotating rod, and the circular ring is sleeved on the spring (3).

4. The vibration switch calibration platform according to claim 1, characterized in that: The eccentric wheel (6) is provided with a radial long strip through hole, and the counterweight (7) comprises a bolt and a nut, and the bolt passes through the long strip through hole and is threadedly connected with the nut.

5. The vibration switch calibration platform according to claim 1, characterized in that: The eccentric wheel (6) may also be provided with a plurality of through holes in the radial direction, and the counterweight (7) comprises bolts and nuts, and the bolts pass through the through holes and are threadedly connected with the nuts.

6. The vibration switch calibration platform according to claim 1, characterized in that: The number of the vibration motors (5) is one to three. If there are multiple vibration motors (5), they are respectively arranged on planes in different directions of the inner platform (2). The number and positions of the vibration sensors (8) correspond to the number and positions of the vibration motors (5).

7. The vibration switch calibration platform according to claim 1, characterized in that: A switch installation panel is arranged outside the inner platform (2), and a connection hole corresponding to the installation hole of the vibration switch (9) is arranged on the switch installation panel.

8. The vibration switch calibration platform according to claim 1, characterized in that: A data processing device (10) is arranged on the outer platform (1), an output end of the vibration sensor (8) is connected to the data processing device (10), and the data processing device (10) is connected to a host computer.

9. A calibration method based on the vibration switch calibration platform according to any one of claims 1 to 8, characterized in that: The vibration switch is mounted on the inner platform (2), the magnetic attraction adjustment knob of the vibration switch (9) is adjusted to the maximum magnetic attraction value, the vibration motor (5) is turned on to drive the inner platform (2) to vibrate, the rotation speed of the vibration motor (5) is adjusted to control the vibration intensity, the current vibration value of the inner platform (2) is obtained through the vibration sensor (8), the vibration intensity of the inner platform (2) is adjusted to the vibration limit value of the vibration switch (9) required by the standard, the magnetic attraction adjustment knob of the vibration switch (9) is fine-tuned to reduce the magnetic force value of the switch adsorption, until the switch in the vibration switch (9) is tripped, and the calibration is completed.

10. The calibration method of the vibration switch calibration platform according to claim 9, characterized in that: The vibration data is collected by a vibration sensor (8), and the collected vibration numerical signal is converted into a current signal through a conversion module, transmitted to a data processing device (10) for processing, and then uploaded to a host computer. The host computer is provided with a display panel, which matches the data processed by the data processing device (10) and displays the specific vibration numerical value.

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