Standard device of speed sensor for calibration of drop hammer impact testing machine

Abstract

The utility model relates to a standard device of a speed sensor for calibration of a drop hammer impact testing machine, which comprises a device support, a vacuum tube arranged on the device support, and an electromagnetic suction device assembled in the vacuum tube in a guiding and moving manner, and further comprises a hammer body capable of being adsorbed on the lower side of the electromagnetic suction device when the electromagnetic suction device is electrified, the periphery of the hammer body and the inner wall of the vacuum tube are arranged at intervals, and an impact buffering device is arranged at the bottom of the vacuum tube and comprises a buffering device base and a buffering seat arranged on the upper side of the buffering device base in a floating mode through a spring. The upper end of the buffer seat is provided with a hammer body positioning groove which is used for being matched with a hammer body in a centering mode, and the caliber of the hammer body positioning groove is gradually reduced from top to bottom. An installation position used for installing a corresponding speed sensor is arranged inside and / or outside the vacuum tube. The utility model provides the standard device of the speed sensor for calibration of the drop hammer impact testing machine, which can calibrate the speed sensor.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor metrology verification, in particular to a standard device for a speed sensor used for calibration of a drop weight impact testing machine. Background Art

[0002] A drop hammer impact tester is a specialized device used to apply impact force to a specimen and conduct impact tests. It's used to determine the impact resistance of a material or structure under dynamic loads. It's widely used in quality inspections of various products and is also a test instrument used by scientific research institutions conducting research on new materials. Its operating principle is to convert the gravitational potential energy of the hammer into impact energy through the free-fall motion of the hammer, performing an impact test on the sample. However, during the hammer's fall, energy is lost due to friction in the protective tube and guide device, as well as air resistance. Energy loss is a key parameter of a drop hammer impact tester, and current verification procedures in my country require calibration using a velocity measurement device.

[0003] That is, the drop hammer velocity of the drop hammer impact testing machine is calibrated through some velocity sensors. Common velocity sensors include laser interferometer sensors, micro-electromechanical acceleration sensors, single-point / double-point photoelectric sensors, and wire displacement detection devices. These sensors are of various types and have different measurement principles. In order to ensure the accuracy and consistency of the drop hammer impact velocity measurement, it is necessary to provide a standard device that can trace the value of the velocity sensor. Utility Model Content

[0004] The purpose of the utility model is to provide a standard device for calibrating a speed sensor for a drop weight impact testing machine, which can calibrate the speed sensor.

[0005] In order to solve the above technical problems, the technical solution of a standard device for calibrating a velocity sensor for a drop weight impact testing machine in the present invention is as follows:

[0006] A standard device for calibrating a velocity sensor for a drop hammer impact testing machine includes a device bracket, a vacuum tube extending in an up-down direction is provided on the device bracket, a vacuum pump is connected to the vacuum tube, an electromagnetic magnetic device is installed in the vacuum tube for guiding movement, and a lifting mechanism for lifting and lowering the electromagnetic magnetic device is provided at the upper end of the device bracket. The standard device also includes a hammer body that can be adsorbed on the lower side of the electromagnetic magnetic device when the electromagnetic magnetic device is energized, the outer periphery of the hammer body is spaced apart from the inner wall of the vacuum tube, an impact buffer device is provided at the bottom of the vacuum tube, the impact buffer device includes a buffer device base and a buffer seat arranged on the upper side of the buffer device base by a spring float, the upper end of the buffer seat is provided with a hammer positioning groove with a diameter that gradually decreases from top to bottom for centering with the hammer body, and an installation position for installing a corresponding velocity sensor is provided inside and / or outside the vacuum tube.

[0007] Furthermore, the lifting mechanism includes a drum driven by a drum motor, and a pull rope connected to the electromagnetic magnetic attraction device is wound around the drum.

[0008] Furthermore, the device bracket is also provided with a displacement detection device that can be raised and lowered for detecting the height position of the hammer body.

[0009] Furthermore, a vertically arranged lead screw and guide rod are provided on the device bracket, a displacement detection device support is installed on the guide rod for guiding movement, the lead screw is driven by a lead screw motor, the displacement detection device includes a laser mounted on the displacement detection device support and facing the vacuum tube, and the displacement detection device also includes a vertically arranged grating scale.

[0010] Furthermore, the standard device also includes a standard device base, the bottom of the device bracket is arranged on the standard device base through a leveling device, and a level or an inclination sensor is arranged on the device bracket.

[0011] Furthermore, the vacuum tube is made of a transparent material.

[0012] Furthermore, the vacuum tube includes a vertically arranged circular tube and a working box arranged at the bottom of the circular tube, the impact buffer device is arranged on the lower side of the working box, the electromagnetic magnetic suction device is matched with the sealing guide movement of the inner wall of the circular tube, an electric hatch is provided at the bottom of the circular tube, and the working box has a door that can be opened and closed.

[0013] Furthermore, the installation positions are respectively set inside the working box and on the upper side of the working box.

[0014] Furthermore, the device bracket includes a top plate, a middle plate and a bottom plate arranged at intervals along the upper and lower directions, the lifting mechanism is arranged on the top plate, the two ends of the circular tube are respectively fixed on the top plate and the middle plate, the working box is located between the middle plate and the bottom plate, and the device bracket also includes four vertical columns arranged at intervals along the circumferential direction, and the top plate, the middle plate and the bottom plate are fixed on the four vertical columns.

[0015] Furthermore, the hammer positioning groove is coaxially arranged with the circular tube.

[0016] The beneficial effects of the present invention are as follows: when the present invention is used, the speed sensor to be calibrated is installed at the installation position, the electromagnetic magnetic device is energized, the electromagnetic magnetic device has magnetism and can attract the upper end of the hammer, the lifting mechanism lifts the hammer to a specified height through the electromagnetic magnetic device, the electromagnetic magnetic device is de-energized, and the hammer falls freely in the absence of air resistance. The expected speed of the hammer when passing the speed sensor can be calculated based on the height of the hammer, and the speed sensor is calibrated by comparing the expected speed of the hammer with the measured value of the speed sensor. After the hammer falls on the impact buffer device, the impact buffer device absorbs the impact energy of the hammer, reduces damage to the hammer during the impact process, and extends the service life of the hammer. At the same time, it can also locate the falling position of the hammer, so that the electromagnetic magnetic device can attract the hammer next time to ensure the positional relationship between the hammer and the vacuum tube, and avoid contact and friction between the outer periphery of the hammer and the inner wall of the vacuum tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an illustrative and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0018] Figure 1 It is a structural diagram of an embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the calibration principle in the present utility model;

[0020] 1. Device bracket; 2. Standard device base; 3. Leveling device; 4. Drum motor; 5. Screw motor; 6. Top plate; 7. Middle plate; 8. Bottom plate; 9. Work box; 10. Impact buffer device; 11. Round tube; 12. Vertical column; 13. Grating scale; 14. Screw; 15. Displacement detection device support; 16. Displacement detection device; 17. Reinforced plate; 18. Pull rope; 19. Electromagnetic magnetic device; 20. Hammer; 21. Electric hatch; 22. Vacuum port; 23. First installation position; 24. Dual-electric laser tester; 25. Reflector; 26. Second installation position; 27. Hammer positioning groove; 28. Buffer seat; 29. ​​Spring; 30. Buffer device base; 31. Drum; 32. Laser. DETAILED DESCRIPTION

[0021] To facilitate understanding of the present invention, the present invention is described in more detail below with reference to the accompanying drawings and specific embodiments. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0022] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art in the field of the present invention. The terms used 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.

[0023] The implementation of a standard device for a velocity sensor for calibrating a drop weight impact tester in the utility model is as follows: Figures 1 and 2 As shown:

[0024] It includes a standard device base and a device bracket 1 set on the standard device base through a leveling device 3. The device bracket 1 is provided with an inclination sensor (or spirit level). In this embodiment, the leveling device 3 includes four leveling support angles set between the device bracket and the standard device base. Each leveling support angle can adjust the height of the corresponding position of the device bracket, thereby adjusting the device bracket to a vertical posture.

[0025] The device bracket includes a top plate 6, a middle plate 7, and a bottom plate 8 spaced apart in the vertical direction. The bracket also includes four vertical columns 12 spaced apart in the circumferential direction. The top plate 6, middle plate 7, and bottom plate 8 are fixed to the four vertical columns. The leveling brackets of the leveling device are located between the four corners of the bottom plate 8 and the standard device base 2. Reinforcement plates are also fixed to the four vertical columns at intervals to increase the overall strength of the device bracket.

[0026] The device bracket is equipped with a vacuum tube extending vertically and connected to a vacuum pump. The vacuum tube is located on the underside of the base plate. An electromagnetic magnetic device is installed in the vacuum tube, which includes an electromagnet. The upper end of the device bracket is equipped with a lifting mechanism for raising and lowering the electromagnetic magnetic device. In this embodiment, the lifting mechanism includes a drum 31 driven by a drum motor, which is connected to the drum through a reduction gearbox. The reduction gearbox is equipped with an angle sensor for controlling the height of the pull rope. The drum 31 and the drum motor are both located on the upper side of the top plate 6. The drum is wrapped with a pull rope 18 connected to the electromagnetic magnetic device. A top cover is installed on the top of the vacuum tube, and the pull rope and the top cover slide and seal together. In this embodiment, the vacuum tube is made of a transparent material and comprises a vertically arranged circular tube 11 and a work box 9 disposed at the bottom of the tube 11. The ends of the circular tube 11 are fixed to the top plate 6 and the middle plate 7, respectively. The work box is disposed between the middle plate 7 and the bottom plate 8. An electromagnetic magnetic device is guided and moved along the inner wall of the circular tube. An electric hatch 21 is provided at the bottom of the circular tube, and the work box 9 has a door that can be opened and closed. A pressure sensor is installed within the work box.

[0027] The standard device also includes a hammer 20 that can be attracted to the underside of the electromagnetic magnetic attraction device when the electromagnetic attraction device is energized. The outer periphery of the hammer 20 is spaced apart from the inner wall of the circular tube. An impact buffer 10 is provided at the bottom of the vacuum tube. The impact buffer 10 is located on the underside of the base plate. The impact buffer 10 includes a buffer base 30 and a buffer seat 28 that is floatingly mounted above the buffer base 30 via a spring 29. The upper end of the buffer seat is provided with a hammer positioning groove 27, which has a diameter that gradually decreases from top to bottom and is used for centering the hammer 20. The hammer positioning groove 27 is coaxial with the circular tube. Mounting locations for corresponding speed sensors are provided inside and outside the vacuum tube. In this embodiment, the mounting locations include a first mounting location 23 located on the upper side of the work box and a second mounting location 26 located inside the work box. The first mounting location is located on the upper surface of the intermediate plate. The first and second mounting locations are respectively used for mounting different types of speed sensors.

[0028] The device bracket is also equipped with a displacement detection device 16 that can be raised and lowered to detect the height position of the hammer. Specifically, the device bracket is equipped with two vertically arranged screws 14, the ends of which are rotatably mounted on the top and bottom plates. The upper ends of the two screws are synchronously driven by a screw motor 5, which is mounted on the upper side of the top plate 6.

[0029] The displacement detection device 16 includes a displacement detection device support 15 coupled to two lead screws. The rotation of the lead screws moves the displacement detection device support 15 up and down. A laser 32, positioned toward the vacuum tube, is mounted on the displacement detection device support 15. The displacement detection device also includes a grating scale 13 arranged parallel to the lead screws. The displacement detection device support 15 cooperates with the grating scale's guided movement to determine the height of the laser 32. When the laser height matches the hammer height, the hammer height can be determined.

[0030] The vacuum box 9 is provided with a vacuum port 22 , and the vacuum port 22 is connected to a vacuum pump, which is located on the lower side of the bottom plate.

[0031] During actual use, the device bracket 1 is adjusted using the leveling device 3 to ensure that the vacuum tube is in a vertical position. When the electromagnetic magnetic device 19 is energized, it exerts a magnetic force, allowing the hammer 20 to be attracted to its lower end. The reel 31 pulls the hammer 20 to a certain height, and the specific height of the hammer is detected by the displacement detection device. The speed sensor to be calibrated in this embodiment is a dual-electric laser velocimeter 24. The dual-electric laser velocimeter 24 can be installed in a first installation position, with the dual-electric laser velocimeter 24 and the reflector 25 positioned on opposite sides of the circular tube. When the electromagnetic magnetic device is de-energized, the hammer falls freely within the vacuum tube without resistance. When the hammer passes the speed sensor, the speed sensor detects its falling speed. The speed sensor is calibrated by comparing the calculated free-fall speed of the hammer with the actual detected falling speed. The hammer eventually landed in the hammer positioning slot of the buffer seat. The spring's buffering and energy absorption prevented excessive damage to the hammer and prevented the hammer from being reflected to other locations. When the hammer was stationary, the hammer positioning slot positioned it coaxially with the tube. This ensured that the next time the electromagnetic attraction device attracted the magnet, the outer periphery of the hammer would be spaced from the inner wall of the tube, preventing the hammer from rubbing against the inner wall of the tube when it fell. Throughout the test, the electric hatch was open, and a pressure sensor detected the pressure in the vacuum tube, which was maintained in a vacuum state by a vacuum pump.

[0032] In other embodiments of the present invention, the hammer body may also have a spherical structure. In this case, the hammer body positioning groove may be a hemispherical groove structure adapted to the bottom of the hammer body, and the bottom of the electromagnetic magnetic device is provided with an upper spherical groove adapted to the upper end of the hammer body. When dealing with other types of speed sensors, such as proximity speed sensors, the electric door can be closed to reduce vacuum leakage, the work box door can be opened, and the speed sensor can be placed in the second installation position of the work box. The door is then closed, the electric door is opened, and the vacuum pump ensures a vacuum environment in the vacuum tube, thereby completing the traceability calibration of the speed sensor.

[0033] In the above description of this specification, unless otherwise expressly specified or limited, terms such as "fixed," "mounted," "connected," or "connected" should be understood broadly. For example, the term "connected" can refer to a fixed connection, a removable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal connection between two components or the interaction between two components. Therefore, unless otherwise expressly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0034] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0035] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinal numbers are used for descriptive purposes only and should not be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, "plurality" means at least two, such as two, three or more, etc., unless otherwise clearly specified.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A standard device for calibrating a velocity sensor for a drop weight impact tester, characterized by: The device includes a device bracket, a vacuum tube extending in the up and down directions is provided on the device bracket, a vacuum pump is connected to the vacuum tube, an electromagnetic magnetic device is installed in the vacuum tube for guiding movement, and a lifting mechanism for lifting and lowering the electromagnetic magnetic device is provided at the upper end of the device bracket. The standard device also includes a hammer body that can be adsorbed on the lower side of the electromagnetic magnetic device when the electromagnetic magnetic device is energized, the outer periphery of the hammer body is spaced apart from the inner wall of the vacuum tube, an impact buffer device is provided at the bottom of the vacuum tube, the impact buffer device includes a buffer device base and a buffer seat arranged on the upper side of the buffer device base by spring floating, the upper end of the buffer seat is provided with a hammer positioning groove with a diameter that gradually decreases from top to bottom and is used to cooperate with the centering of the hammer body, and an installation position for installing a corresponding speed sensor is provided inside and / or outside the vacuum tube.

2. The standard device according to claim 1, characterized in that: The lifting mechanism comprises a drum driven by a drum motor, and a pull rope connected to the electromagnetic magnetic attraction device is wound around the drum.

3. The standard device according to claim 1, characterized in that: The device bracket is also provided with a displacement detection device which can be raised and lowered and is used to detect the height position of the hammer body.

4. The standard device according to claim 3, characterized in that: A vertically arranged lead screw and guide rod are provided on the device bracket, a displacement detection device support is installed on the guide rod for guiding movement, the lead screw is driven by a lead screw motor, the displacement detection device includes a laser mounted on the displacement detection device support and facing the vacuum tube, and the displacement detection device also includes a vertically arranged grating scale.

5. The standard device according to claim 1, characterized in that: The standard device also includes a standard device base. The bottom of the device bracket is arranged on the standard device base through a leveling device. The device bracket is provided with a level or an inclination sensor.

6. The standard device according to claim 1, characterized in that: The vacuum tube is made of transparent material.

7. The standard device according to any one of claims 1 to 6, characterized in that: The vacuum tube includes a vertically arranged circular tube and a working box arranged at the bottom of the circular tube. The impact buffer device is arranged on the lower side of the working box. The electromagnetic magnetic suction device is matched with the sealing guide movement of the inner wall of the circular tube. An electric hatch is arranged at the bottom of the circular tube, and the working box has a door that can be opened and closed.

8. The standard device according to claim 6, characterized in that: The installation positions are respectively arranged inside the working box and on the upper side of the working box.

9. The standard device according to claim 7, characterized in that: The device bracket includes a top plate, a middle plate and a bottom plate arranged at intervals along the upper and lower directions. The lifting mechanism is arranged on the top plate. The two ends of the circular tube are respectively fixed on the top plate and the middle plate. The working box is located between the middle plate and the bottom plate. The device bracket also includes four vertical columns arranged at intervals along the circumferential direction. The top plate, the middle plate and the bottom plate are fixed on the four vertical columns.

10. The standard device according to claim 6, characterized in that: The hammer body positioning groove is coaxially arranged with the circular tube.

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