Isostatic pressing graphite workpiece stability testing device

Abstract

The utility model discloses an isostatic pressing graphite workpiece stability testing device which comprises a controller, a humidifier, a sealing box, a cover plate, a first roller, a second roller, a first distance measuring sensor, a second distance measuring sensor and a third distance measuring sensor. The cover plate is arranged above the sealing box in a lifting mode, the first distance measuring sensor is arranged at the bottom of the cover plate and located over the cylindrical isostatic pressing graphite workpiece, and the second distance measuring sensor is arranged in the sealing box and located under the bottom of the cylindrical isostatic pressing graphite workpiece. The third distance measuring sensors are arranged in the sealing box in a lifting mode and located on the two sides of the cylindrical isostatic pressing graphite workpiece, various high-humidity environments are built through the humidifier, the first distance measuring sensors, the second distance measuring sensors and the third distance measuring sensors are used for detecting the distance between the cylindrical isostatic pressing graphite workpiece and the third distance measuring sensors, and the dimensional stability test is automatically completed.

Description

A stability testing device for isostatically pressed graphite workpieces Technical Field

[0001] This utility model relates to the field of isostatic graphite workpiece testing technology, and in particular to a stability testing device for isostatic graphite workpieces. Background Technology

[0002] During the production of isostatically pressed graphite workpieces, changes in equipment or process control parameters can cause changes in the properties of the isostatically pressed graphite workpieces. For example, changes in hygroscopicity can lead to slight changes in the size of the isostatically pressed graphite workpieces due to changes in ambient humidity. This is especially true for large cylindrical isostatically pressed graphite workpieces, where changes in hygroscopicity can cause more significant dimensional changes.

[0003] To ensure that isostatically pressed graphite workpieces meet usage requirements in humid environments, it is necessary to test their dimensional stability under high humidity conditions. Currently, there is no equipment specifically designed for testing the dimensional stability of isostatically pressed graphite workpieces under different humidity conditions. The existing technology involves placing the workpiece in a sealed chamber, adjusting the humidity within the chamber, allowing it to stand for a period of time, and then removing the workpiece for dimensional measurement. This process is cumbersome and inefficient. Furthermore, changes in ambient humidity after the workpiece is removed lead to inaccurate measurement data, necessitating improvement. Summary of the Invention

[0004] The purpose of this invention is to provide a stability testing device for isostatically pressed graphite workpieces, which can be used to test the dimensional stability of cylindrical isostatically pressed graphite workpieces under different humidity conditions, thereby improving the efficiency and accuracy of the test.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A stability testing device for isostatically pressed graphite workpieces includes: a controller, a humidifier, a sealed box, a cover plate, a first roller, a second roller, a first distance sensor, a second distance sensor, and a third distance sensor. A pipe is provided between the output end of the humidifier and the sealed box. The cylindrical isostatically pressed graphite workpiece is horizontally placed in the sealed box. The first and second rollers are parallel to each other on both sides of the bottom of the cylindrical isostatically pressed graphite workpiece for rolling support. The cover plate is vertically adjustable above the sealed box. The first distance sensor is located at the bottom of the cover plate and directly above the cylindrical isostatically pressed graphite workpiece. The second distance sensor is located inside the sealed box and directly below the bottom of the cylindrical isostatically pressed graphite workpiece. The third distance sensor is vertically adjustable inside the sealed box and located on both sides of the cylindrical isostatically pressed graphite workpiece. The first, second, and third distance sensors are respectively connected to the controller for signal transmission. The controller is connected to the humidifier for operation control.

[0007] The sealed box is equipped with a motor that drives the first roller to rotate, and the controller is connected to the motor to control the rotation.

[0008] The sealed box or cover is equipped with a humidity sensor, which is connected to the controller to send signals.

[0009] The sealed box is equipped with a lifting drive mechanism on both sides to drive the third ranging sensor to adjust up and down. The controller is connected to the lifting drive mechanism to control the lifting.

[0010] The lifting drive mechanism is an electric lead screw slide.

[0011] The sealed box is equipped with brackets on both sides of the cover plate, and a fixing plate is provided on the top of the brackets. A cylinder connected to the cover plate is provided on the fixing plate.

[0012] The cover plate is provided with a guide rod that extends upward through the fixing plate, and the fixing plate is provided with a guide sleeve corresponding to the guide rod.

[0013] The cover plate is equipped with a pressure relief valve.

[0014] The beneficial effects of this utility model are as follows: A stability testing device for isostatically pressed graphite workpieces supports and rotates the cylindrical isostatically pressed graphite workpiece using a first and second roller, and uses a humidifier to increase the humidity of the sealed box to create various high-humidity environments. Before, during, and after humidification, the distance between the workpiece and the first, second, and third distance sensors is detected using a first, second, and third distance sensor to obtain the change in the outer radius of the cylindrical isostatically pressed graphite workpiece. This device automatically completes the dimensional stability test of the cylindrical isostatically pressed graphite workpiece under different humidity conditions, which is highly efficient and reduces labor costs. Attached Figure Description

[0015] Figure 1 is a structural schematic diagram of this utility model;

[0016] Figure 2 is a schematic diagram of the structure after the cover plate in Figure 1 is raised and opened. Detailed Implementation

[0017] The technical solution of this utility model will be further explained below with reference to Figures 1 and 2 and through specific embodiments.

[0018] As shown in Figure 1, the isostatic pressing graphite workpiece stability testing device is used to test the outer radius stability of large-sized cylindrical isostatic pressing graphite workpieces 9 under different humidity conditions. The device includes: a controller 16, a humidifier 5, a sealed box 1, a cover plate 8, a first roller 14, a second roller 15, a first distance sensor 11, a second distance sensor 12, and a third distance sensor 13. A pipe 7 is provided between the output end of the humidifier 5 and the sealed box 1. The humidifier 5 is used to increase the humidity of the sealed box 1, creating various high-humidity environments to simulate more realistic usage scenarios.

[0019] The humidifier 5 is connected to the controller 16 (PLC) for operation control. A humidity sensor 4 is installed on the sealed box 1 or the cover plate 8. The humidity sensor 4 is connected to the controller 16 to send signals, realizing real-time monitoring of the humidity inside the sealed box 1. This facilitates the controller 16's control over the start and stop of the humidifier 5 and improves the accuracy of the humidity environment.

[0020] The cylindrical isostatic graphite workpiece 9 is horizontally arranged in the sealed box 1. The first roller 14 and the second roller 15 are arranged in parallel on both sides of the bottom of the cylindrical isostatic graphite workpiece 9 to provide rolling support for the cylindrical isostatic graphite workpiece 9. The first roller 14 and the second roller 15 are tangent to the outer circle of the cylindrical isostatic graphite workpiece 9 to achieve self-centering.

[0021] A motor is provided in or on the outside of the sealed box 1 to drive the first roller 14 to rotate. The controller 16 is connected to the motor to control the rotation, thereby realizing the rotation of the cylindrical isostatic graphite workpiece 9 and improving the uniformity of moisture absorption.

[0022] The cover plate 8 is vertically and flexibly positioned above the sealing box 1 to seal the sealing box 1. The cover plate 8 is equipped with a pressure relief valve 19, which can release excess air and prevent the air pressure in the sealing box 1 from becoming too high.

[0023] In this embodiment, the sealing box 1 is provided with brackets 6 located on both sides of the cover plate 8. The top of the brackets 6 is provided with a fixing plate 2. The fixing plate 2 is provided with a cylinder 3 connected to the cover plate 8. The cylinder 3 can be extended and retracted by the controller 16, as shown in Figure 2, to drive the cover plate 8 to rise and fall.

[0024] A guide rod 18 is provided on the cover plate 8, which extends upward through the fixed plate 2. A guide sleeve 17 corresponding to the guide rod 18 is provided on the fixed plate 2. The cover plate 8 is guided to rise and fall by the cooperation of the guide rod 18 and the guide sleeve 17, which has high stability.

[0025] As shown in Figure 1, the first distance sensor 11 is set at the bottom of the cover plate 8 and directly above the cylindrical isostatic graphite workpiece 9 to detect the distance a1 between the top of the cylindrical isostatic graphite workpiece 9 and the first distance sensor 11. Before, during and after humidification, the change in distance a1 is used to obtain the change in the outer radius of the top of the cylindrical isostatic graphite workpiece 9 under the corresponding humidity conditions, and the change in the outer radius b1 is obtained.

[0026] The second distance sensor 12 is placed inside the sealed box 1 and located directly below the bottom of the cylindrical isostatic graphite workpiece 9. The distance a2 between the bottom of the cylindrical isostatic graphite workpiece 9 and the second distance sensor 12 is detected. Before, during and after humidification, the change in the outer radius of the bottom of the cylindrical isostatic graphite workpiece 9 under the corresponding humidity conditions is obtained by the change in distance a2.

[0027] The third distance sensor 13 is vertically mounted in the sealed box 1 and located on both sides of the cylindrical isostatic graphite workpiece 9. In this embodiment, the two side walls of the sealed box 1 are provided with a lifting drive mechanism 10 for driving the third distance sensor 13 to adjust up and down. The lifting drive mechanism 10 adopts an electric lead screw slide. The controller 16 is connected to the lifting drive mechanism 10 to control the lifting, so that the third distance sensor 13 is horizontally pointed to the central axis of the cylindrical isostatic graphite workpiece 9, and the distance a3 between the side of the cylindrical isostatic graphite workpiece 9 and the third distance sensor 13 is measured. Before, during and after humidification, the change of distance a3 is used to obtain the change of the outer radius of the side of the cylindrical isostatic graphite workpiece 9 under the corresponding humidity conditions, b3.

[0028] In this embodiment, the first ranging sensor 11, the second ranging sensor 12, and the third ranging sensor 13 are respectively connected to the controller 16 for signal transmission, and the ranging results are recorded by the controller 16. To ensure that the positions of the first ranging sensor 11, the second ranging sensor 12, and the third ranging sensor 13 pointing to the cylindrical isostatic graphite workpiece 9 remain unchanged before, during, and after humidification, marks corresponding to the first ranging sensor 11, the second ranging sensor 12, and the third ranging sensor 13 are made at the ends of the cylindrical isostatic graphite workpiece 9. The cylindrical isostatic graphite workpiece 9 is rotated by the first roller 14, and the marks are observed through the transparent observation window on the side of the sealed box 1. After the first ranging sensor 11, the second ranging sensor 12, and the third ranging sensor 13 point to their respective marked positions, the ranging results are recorded. Finally, b1, b2, and b3 are added together and averaged to obtain the change in the outer radius of the cylindrical isostatic graphite workpiece 9 under the corresponding humidity conditions, thus realizing the outer diameter stability test.

[0029] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A device for testing the stability of isostatically pressed graphite workpieces, used to test the dimensional stability of cylindrical isostatically pressed graphite workpieces under different humidity conditions, characterized in that... include: The system comprises a controller, a humidifier, a sealed box, a cover plate, a first roller, a second roller, a first distance sensor, a second distance sensor, and a third distance sensor. A pipe is provided between the output end of the humidifier and the sealed box. The cylindrical isostatic graphite workpiece is horizontally placed in the sealed box. The first and second rollers are arranged parallel to each other on both sides of the bottom of the cylindrical isostatic graphite workpiece for rolling support. The cover plate is vertically adjustable above the sealed box. The first distance sensor is located at the bottom of the cover plate and directly above the cylindrical isostatic graphite workpiece. The second distance sensor is located inside the sealed box and directly below the bottom of the cylindrical isostatic graphite workpiece. The third distance sensor is vertically adjustable inside the sealed box and located on both sides of the cylindrical isostatic graphite workpiece. The first, second, and third distance sensors are connected to the controller for signal transmission. The controller is connected to the humidifier for operation control.

2. The apparatus of claim 1, wherein, A motor that drives the first roller to rotate is provided inside or on the outside of the sealed box, and the controller is connected to the motor to control the rotation.

3. The apparatus of claim 1, wherein, A humidity sensor is installed on the sealed box or cover plate, and the humidity sensor is connected to the controller to send signals.

4. The apparatus of claim 1, wherein, The sealed box is equipped with a lifting drive mechanism on both sides to drive the third ranging sensor to adjust up and down. The controller is connected to the lifting drive mechanism to control the lifting.

5. The apparatus of claim 4, wherein, The lifting drive mechanism adopts an electric lead screw slide.

6. The apparatus of claim 1, wherein, The sealed box is equipped with brackets located on both sides of the cover plate, and a fixing plate is provided on the top of the brackets. A cylinder connected to the cover plate is provided on the fixing plate.

7. The apparatus of claim 6, wherein, The cover plate is provided with a guide rod that extends upward through the fixing plate, and the fixing plate is provided with a guide sleeve corresponding to the guide rod.

8. The apparatus of claim 1, wherein, A pressure relief valve is provided on the cover plate.

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