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CN115854937B - Graphite electrode detection device - Google Patents

Graphite electrode detection device Download PDF

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Publication number
CN115854937B
CN115854937B CN202310159378.5A CN202310159378A CN115854937B CN 115854937 B CN115854937 B CN 115854937B CN 202310159378 A CN202310159378 A CN 202310159378A CN 115854937 B CN115854937 B CN 115854937B
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China
Prior art keywords
ring
sealing ring
graphite electrode
connecting plate
sleeve
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CN202310159378.5A
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Chinese (zh)
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CN115854937A (en
Inventor
董增亮
张向军
张胜利
肖国宏
乔亚东
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Shanxi Juxian Graphite New Material Co ltd
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Shanxi Juxian Graphite New Material Co ltd
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Abstract

The invention discloses a graphite electrode detection device, which comprises a sleeve, wherein one end of the sleeve is rotationally connected with a connecting plate, the outer side of the sleeve is provided with a sealing ring in a sliding manner, the sealing ring is provided with a cavity structure, the inside of the sealing ring is connected with a compression ring in a sliding manner, and one side surface of the sealing ring, which is close to the connecting plate, is provided with a first through hole; the device comprises a connecting plate, a graphite electrode, a pressing ring, a guide assembly, a sealing ring, a first through hole, a second through hole, a guide assembly and a sealing ring, wherein the pressing assembly is arranged on one side of the connecting plate, which is close to the graphite electrode, and the guide assembly is arranged on the pressing ring; the gas in the sealing ring is led out circle by circle through the flow guide assembly, so that whether the end face of the graphite electrode is concave or not is detected, the structure is comprehensive in detection, detection data are accurate, and the end face of the graphite electrode can be detected omnidirectionally.

Description

Graphite electrode detection device
Technical Field
The invention relates to the technical field of graphite electrode detection, in particular to a graphite electrode detection device.
Background
The graphite electrode is widely applied to the fields of chemical industry, photovoltaic power generation, metallurgy, aerospace and the like, and the graphite electrode needs to be detected before being processed and delivered, mainly comprises the detection of the flatness of the two ends of the graphite electrode, and the uneven end face of the graphite electrode can cause poor contact of the graphite electrode and even safety accidents.
Chinese patent CN212482371U discloses a graphite electrode end face verticality detecting device, which comprises a base plate, a support rod, a slide block, a hanging bracket and an electric push rod, wherein hydraulic cylinders are arranged on two sides of the hanging bracket, clamping blocks are arranged at the output ends of the hydraulic cylinders, and a limiting counter bore is formed in the bottom of the hanging bracket; a detection component is arranged below the limiting counter bore and comprises a telescopic rod, a trapezoid block and a tension display, one end of the tension display is arranged on the supporting rod, and one side of the supporting rod is provided with a control panel; when the end face verticality of the graphite electrode is 90 degrees and is completely clamped in the gap between the trapezoid blocks and continuously pressed downwards, the tension display is subjected to downward inclined and same tension, and the display values of the tension display are the same; through observing whether the display numerical values of the tension display are the same, whether the end face perpendicularity of the graphite electrode is 90 degrees can be directly judged, and the tension display is simple in structure, and is time-saving and labor-saving.
The device detects the perpendicularity of the end face of the graphite electrode through the symmetrically arranged detection assemblies, but in the practical use process, the structure can only detect the end face of the graphite electrode in a single direction, and when the end face of the graphite electrode is concave, the detection is difficult in the mode, so that the device has certain limitation in the specific use process.
Therefore, it is necessary to provide a graphite electrode detection device to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a graphite electrode detection device, which is used for solving the problems that the prior device provided in the prior art detects the perpendicularity of the end face of a graphite electrode through symmetrically arranged detection components, but in the actual use process, the structure can only detect the end face of the graphite electrode in a single direction, and when the end face of the graphite electrode is concave, and the like, the detection is difficult.
Based on the thought, the invention provides the following technical scheme: the sealing device comprises a sleeve, wherein one end of the sleeve is rotationally connected with a connecting plate, a sealing ring is slidably arranged on the outer side of the sleeve, the sealing ring is of a cavity structure, a compression ring is slidably connected inside the sealing ring, and a first through hole is formed in one side surface, close to the connecting plate, of the sealing ring;
the connecting plate is provided with the extrusion subassembly near one side of graphite electrode, be equipped with the water conservancy diversion subassembly on the clamping ring, when the extrusion subassembly pressurized, its inside gas can be through leading-in to the sealing ring inner chamber in the first through-hole, and can be with the gaseous round by round of leading-out in the sealing ring through the water conservancy diversion subassembly.
As a further scheme of the invention: the extrusion assembly comprises an air bag arranged on one side of a connecting plate, one end of the air bag, which is close to the connecting plate, is fixedly connected with an annular plate, a cavity is formed in the annular plate, the annular plate is in running fit with the connecting plate, a plurality of diversion holes are uniformly formed in one side surface of the connecting plate, which is close to a sealing ring, a diversion channel is formed between the outer side wall of the sleeve and the inner wall of the graphite electrode, a baffle ring is fixedly sleeved on the outer side of the sleeve, and a first spring is arranged between the baffle ring and the sealing ring.
As a further scheme of the invention: the guide assembly comprises a rotating ring which is arranged in an inner cavity of the sealing ring in a rotating mode, a plurality of groups of first through holes are formed in the rotating ring, the first through holes in each group are arranged along the inclined direction, the second through holes are arranged in a plurality of groups, the second through holes in each group are arranged along the diameter direction of the sealing ring, the rotating ring is in contact with the sealing ring and in running fit, a limiting shaft is connected inside the sealing ring in a rotating mode, the limiting shaft is arranged along the axis direction of the sealing ring, a round hole matched with the limiting shaft is formed in the pressing ring, the limiting shaft penetrates through the round hole and is in sliding fit with the pressing ring, a guide groove and a limiting groove are formed in the outer peripheral surface of the limiting shaft, the limiting groove is in a spiral shape, the guide groove is in a horizontal shape, the guide groove is communicated with the guide groove, a limiting block is fixedly connected to the inner wall of the round hole, the limiting block is in sliding fit with the limiting groove and the guide groove, a transmission tooth is arranged on the outer side of the rotating ring, a gear is fixedly sleeved on the outer side of the limiting shaft, and the gear is meshed with the transmission tooth.
As a further scheme of the invention: one side of the connecting plate, which is far away from the air bag, is fixedly connected with a rotating shaft, and one end of the rotating shaft extends to the outer side of the sleeve and is fixedly connected with a crank.
As a further scheme of the invention: the outer peripheral surface of the sleeve is provided with a positioning groove, the inner peripheral surface of the sealing ring is fixedly connected with a positioning block, and the positioning block is slidably connected inside the positioning groove.
As a further scheme of the invention: the outside cover of spacing axle is equipped with the second spring, the second spring sets up between clamping ring and sealing ring.
As a further scheme of the invention: the outer side peripheral surface of the sealing ring is fixedly connected with a sliding plate, a fixed frame is sleeved on the outer side sliding sleeve of the sliding plate, and fastening bolts are engaged with two sides of the fixed frame in a threaded manner.
As a further scheme of the invention: the pressure ring is provided with a gas pressure sensor on one side surface close to the connecting plate, the output end of the gas pressure sensor is electrically connected with a controller, and the controller is electrically connected with an external display.
As a further scheme of the invention: the connecting plate is close to the first snap ring of fixedly connected with on the side of pivot, the sleeve is close to the one end fixedly connected with second snap ring of connecting plate, the second snap ring rotates the outside of connecting in first snap ring.
Compared with the prior art, the invention has the beneficial effects that: the connecting plate is connected with the electrode hole thread on the graphite electrode, and telescopic outside slip is provided with the sealing ring, when the connecting plate screw in to the inside of graphite electrode, the sealing ring is laminated with the terminal surface of graphite electrode mutually to be convenient for follow-up terminal surface straightness to the graphite electrode detects, this device cooperatees with the water conservancy diversion subassembly through the extrusion subassembly that sets up, when the water conservancy diversion subassembly is by the extrusion, its inside gas is extruded to the sealing ring inside, at this in-process, can carry out holistic detection to the terminal surface straightness of graphite electrode, if terminal surface straightness does not meet the requirements, the atmospheric pressure numerical value in the sealing ring is less, later derive the gas in the sealing ring round by round through the water conservancy diversion subassembly, thereby detect the condition such as there is indent in graphite electrode terminal surface, therefore, the above-mentioned structure detects comprehensively, and the detected data is comparatively accurate, can all-round detect the terminal surface of graphite electrode.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the structure of the connecting plate and the seal ring of the present invention;
FIG. 3 is a schematic view of the sleeve structure of the present invention;
FIG. 4 is a schematic view of a press ring and a limiting shaft according to the present invention;
FIG. 5 is a schematic view of a rotating ring and gear structure according to the present invention;
FIG. 6 is a schematic diagram of the structure of the guide slot and the limit slot of the present invention;
FIG. 7 is a graph of first and second via patterns according to the present invention;
FIG. 8 is a cross-sectional view of the web and sleeve of the present invention;
FIG. 9 is a schematic view of a stopper according to the present invention;
fig. 10 is an enlarged schematic view of the structure of fig. 4 at a in accordance with the present invention.
In the figure: 1. a bottom plate; 2. a display; 3. a rotating shaft; 4. a baffle ring; 5. a first spring; 6. a seal ring; 7. a connecting plate; 8. an air bag; 9. a bottom cover; 10. a sleeve; 11. a first through hole; 12. an annular plate; 13. a positioning groove; 14. a limiting shaft; 15. a second spring; 16. a compression ring; 17. a guide groove; 18. a limit groove; 19. a second through hole; 20. a gear; 21. a drive tooth; 22. a support ring; 23. a first snap ring; 24. a second snap ring; 25. a deflector aperture; 26. a graphite electrode; 27. a positioning block; 28. a limiting block; 29. a fastening bolt; 30. a rotating ring; 31. a diversion channel; 32. a slide plate; 33. and fixing the frame.
Detailed Description
As shown in fig. 1-4 and 8, a graphite electrode detection device comprises a bottom plate 1 and a sleeve 10 arranged at the top of the bottom plate 1, wherein one end of the sleeve 10 is rotationally connected with a connecting plate 7, the connecting plate 7 is in threaded connection with an electrode hole on a graphite electrode 26, a sealing ring 6 is slidably arranged on the outer side of the sleeve 10, and when the connecting plate 7 is screwed into the graphite electrode 26, the sealing ring 6 is attached to the end face of the graphite electrode 26, so that the subsequent detection of the perpendicularity of the end face of the graphite electrode 26 is facilitated.
The sealing ring 6 is of a cavity structure, the inside of the sealing ring 6 is slidably connected with the pressing ring 16, the pressing ring 16 is in sealing fit with the inner wall of the sealing ring 6, when the air pressure on one side of the inner cavity of the sealing ring 6 is increased, the pressing ring 16 can be pushed to slide inside the sealing ring 6, an extrusion component is arranged on one side, close to the graphite electrode 26, of the connecting plate 7, and a plurality of first through holes 11 are formed in one side, close to the connecting plate 7, of the sealing ring 6, so that air enters the sealing ring 6 through the first through holes 11.
The above-mentioned extrusion subassembly is including setting up in the gasbag 8 of connecting plate 7 one side, and gasbag 8 is telescopic structure, and its one end fixedly connected with annular plate 12 that is close to connecting plate 7, annular plate 12 and connecting plate 7 normal running fit, after gasbag 8 extrudees, and its inside gas can be led into in the connecting plate 7 inner chamber through this annular plate 12, the one end fixedly connected with bottom 9 of connecting plate 7 is kept away from to gasbag 8, and above-mentioned connecting plate 7 inside sets up to the cavity for annular plate 12 can extend to in the connecting plate 7 inner chamber and rotate with it to be connected, evenly offered a plurality of water conservancy diversion holes 25 on the one side that connecting plate 7 is close to sealing ring 6, after connecting plate 7 screw in to graphite electrode 26 inside, form water conservancy diversion passageway 31 between the lateral wall of sleeve 10 and the inner wall of graphite electrode 26.
Further, a baffle ring 4 is fixedly sleeved on the outer side of the sleeve 10, a first spring 5 is arranged between the baffle ring 4 and the sealing ring 6, and the first spring 5 is sleeved on the outer side of the sleeve 10.
Specifically, in order to more intuitively observe the test result, a gas pressure sensor may be installed on a side surface of the compression ring 16 near the connection plate 7, an output end of the gas pressure sensor is electrically connected with a controller, not shown in the figure, the controller may be a single chip microcomputer or a PLC, and the controller is electrically connected with the display 2 on the outer side, in the specific test process, the connection plate 7 is aligned to an electrode hole on the graphite electrode 26 and screwed into the graphite electrode 26, at this time, the sealing ring 6 contacts with an end surface of the graphite electrode 26, and as the connection plate 7 gradually goes deep into the electrode hole, the sealing ring 6 gradually compresses the first spring 5, so that the sealing ring can be closely attached to the end surface of the graphite electrode 26, after one end of the air bag 8 contacts with an inner end surface of the electrode hole, the air bag 8 can be extruded through the graphite electrode 26, so that the gas in the air bag 8 is extruded into the inner cavity of the connecting plate 7 and flows to the diversion channel 31 through the diversion hole 25, further, the gas can flow into the inner cavity of the sealing ring 6 through the first through hole 11 and extrude the pressing ring 16, so that the gas slides in the inner cavity of the sealing ring 6, after the gas slides to the limit position, the pressure born by the pressing ring 16 is gradually increased along with the continuous entering of the gas into the sealing ring 6, at the moment, the gas pressure in the sealing ring 6 is detected by the gas pressure sensor, the detected analog signal is transmitted to the controller, the controller is transmitted to the external display 2 after analysis and processing, when the perpendicularity of the end face of the graphite electrode 26 meets the requirement, the gas in the sealing ring 6 and the diversion channel 31 is difficult to flow out through the gap between the sealing ring 6 and the end face of the graphite electrode 26, at this time, the pressure fluctuation of the gas is small, the pressure value displayed on the display 2 is stable or is in a slow descending trend, and when the perpendicularity of the end face of the graphite electrode 26 does not meet the requirement, the gas in the sealing ring 6 and the diversion channel 31 can flow out rapidly, and at this time, the displayed pressure value on the display 2 is small, so that the perpendicularity of the end face of the graphite electrode 26 can be detected through the structure.
As shown in fig. 5-9, when the end surface of the graphite electrode 26 protrudes outwards or is recessed inwards, the above structure has a certain limitation in use, so that the present solution further provides a flow guiding assembly on the pressure ring 16.
Specifically, the above-mentioned water conservancy diversion subassembly includes rotating ring 30 that sets up in sealing ring 6 inner chamber, has seted up second through-hole 19 on the rotating ring 30, and as shown in fig. 5 and 7, the quantity of first through-hole 11 is provided with the multiunit, and the first through-hole 11 in every group is arranged along the direction of slope, second through-hole 19 is provided with the multiunit, and the second through-hole 19 in each group is arranged along sealing ring 6's diameter direction, rotating ring 30 and sealing ring 6 contact and normal running fit, when second through-hole 19 is by inner circle to the outer circle progressively with first through-hole 11 alignment, the gas in the sealing ring 6 can be through the first through-hole 11 of progressively opening out.
The inside rotation at sealing ring 6 is connected with spacing axle 14, spacing axle 14 arranges along the axis direction of sealing ring 6, set up on the clamping ring 16 with spacing axle 14 matched with round hole for spacing axle 14 passes this round hole and with clamping ring 16 sliding fit, set up guide way 17 and spacing groove 18 on spacing axle 14's the outside global, spacing groove 18 sets up to the heliciform, and guide way 17 is the horizontality, and spacing groove 18 is linked together with guide way 17, fixedly connected with stopper 28 on the inner wall of round hole, stopper 28 and spacing groove 18 and guide way 17 sliding fit.
Further, a gear 20 is fixedly sleeved on the outer side of one of the limiting shafts 14, and the gear 20 is meshed with the gear 21.
In the initial state, the second through holes 19 are staggered with the first through holes 11, so that after gas enters the sealing ring 6 through the diversion channel 31 and the first through holes 11 at the innermost ring and extrudes the pressing ring 16 to the limit position, the internal pressure of the gas gradually increases along with the continuous entering of the gas into the sealing ring 6, in the process, the limiting block 28 gradually slides from the guide groove 17 on the limiting shaft 14 to the inside of the limiting groove 18, at the moment, the limiting block 28 and the limiting groove 18 are extruded, when the limiting block 28 slides in the limiting groove 18, the limiting shaft 14 can be driven to rotate, the gear 20 can be driven to synchronously rotate through the limiting shaft 14, the rotating ring 30 can be driven to rotate by the meshing of the gear 20 and the transmission teeth 21, so that the position of the second through holes 19 relative to the first through holes 11 is changed, as shown in figure 7, when the rotating ring 30 rotates by a certain angle and then the second through holes 19 are aligned with the first through holes 11 in the direction from inside to outside, at this time, the gas in the sealing ring 6 can be led out through the first through holes 11 and the second through holes 19 which are aligned with each other, if the perpendicularity of the end face of the graphite electrode 26 meets the requirement, the sealing ring 6 can be closely attached to the end face, at this time, the gas pressure will not generate large fluctuation, but if the end face has the condition of protruding or recessed, the gas can be led out through the first through holes 11 and the second through holes 19, so that the gas pressure fluctuation can be generated, at this time, by observing the pressure value on the display 2, and similarly, when the rotating ring 30 continues to rotate, the second through holes 19 can be aligned with the first through holes 11 of the third circle, so that the first through holes 11 are aligned with the second through holes 19, and the end face of the graphite electrode 26 is detected from inside to outside, detecting whether the concave and other conditions exist.
To sum up, this device cooperatees with the water conservancy diversion subassembly through the extrusion subassembly that sets up, when the water conservancy diversion subassembly was extrudeed, its inside gaseous quilt was extruded to sealing ring 6 inside, in this process, can carry out holistic detection to the terminal surface straightness of graphite electrode 26, if the terminal surface straightness is not satisfactory, the atmospheric pressure numerical value in the sealing ring 6 is less, afterwards derive the gas in the sealing ring 6 round by round through the water conservancy diversion subassembly to detect the condition such as recess has on graphite electrode 26 terminal surface, consequently, above-mentioned structure detects comprehensively, and the detected data is comparatively accurate, can all-round to the terminal surface of graphite electrode 26 detects.
As shown in fig. 4 and 8, in order to drive the connection plate 7 to rotate, a rotating shaft 3 is fixedly connected to a side surface of the connection plate, which is far away from the air bag 8, one end of the rotating shaft 3 extends to the outer side of the sleeve 10 and is fixedly connected with a crank, a first clamping ring 23 is fixedly connected to a side surface of the connection plate 7, which is close to the rotating shaft 3, and one end of the sleeve 10, which is close to the connection plate 7, is fixedly connected with a second clamping ring 24, and the second clamping ring 24 is rotatably connected to the outer side of the first clamping ring 23, so that the rotation fit between the connection plate 7 and the sleeve 10 is realized.
In addition, the positioning groove 13 is formed in the outer peripheral surface of the sleeve 10, the positioning block 27 is fixedly connected to the inner peripheral surface of the sealing ring 6, and the positioning block 27 is slidably connected to the inside of the positioning groove 13, so that the sealing ring 6 can be prevented from rotating relative to the sleeve 10, and the sealing ring 6 can be contacted with the end surface of the graphite electrode 26 more stably.
As shown in fig. 4 and 10, in order to drive the compression ring 16 to reset, a second spring 15 is sleeved outside the limiting shaft 14, and the second spring 15 is arranged between the compression ring 16 and the sealing ring 6.
In order to install the rotating ring 30, the inner cavity of the sealing ring 6 is fixedly sleeved with the supporting ring 22, and the rotating ring 30 is rotatably sleeved on the outer side of the supporting ring 22.
As shown in fig. 1, in order to adjust the overall height of the apparatus, a sliding plate 32 is fixedly connected to the outer peripheral surface of the sealing ring 6, a fixing frame 33 is sleeved on the outer side of the sliding plate 32, the fixing frame 33 is fixedly connected to the top of the bottom plate 1, fastening bolts 29 are arranged on two sides of the fixing frame 33, the fastening bolts 29 penetrate through the fixing frame 33 and are in threaded connection with the fixing frame 33, the display 2 is mounted on the fixing frame 33, in particular, in the use process, the sliding plate 32 is adjusted up and down according to the height of the graphite electrode 26, and after adjustment, the sliding plate 32 is fixed through the fastening bolts 29, so that the connecting plate 7 is aligned with the electrode holes of the graphite electrode 26.

Claims (7)

1. The utility model provides a graphite electrode detection device, includes sleeve, its characterized in that: one end of the sleeve is rotationally connected with a connecting plate, a sealing ring is arranged on the outer side of the sleeve in a sliding manner, the sealing ring is of a cavity structure, a compression ring is connected in the sealing ring in a sliding manner, and a first through hole is formed in one side surface, close to the connecting plate, of the sealing ring;
the device comprises a connecting plate, a graphite electrode, a pressing ring, a guide assembly, a sealing ring, a first through hole, a second through hole, a guide assembly and a sealing ring, wherein the pressing assembly is arranged on one side of the connecting plate, which is close to the graphite electrode, and the guide assembly is arranged on the pressing ring;
the extrusion assembly comprises an air bag arranged on one side of a connecting plate, one end of the air bag, which is close to the connecting plate, is fixedly connected with an annular plate, a cavity is formed in the annular plate, the annular plate is in running fit with the connecting plate, a plurality of diversion holes are uniformly formed in one side surface, which is close to a sealing ring, of the connecting plate, a diversion channel is formed between the outer side wall of the sleeve and the inner wall of the graphite electrode, a baffle ring is fixedly sleeved on the outer side of the sleeve, and a first spring is arranged between the baffle ring and the sealing ring;
the guide assembly comprises a rotating ring which is arranged in an inner cavity of the sealing ring in a rotating mode, a plurality of groups of first through holes are formed in the rotating ring, the first through holes in each group are arranged along the inclined direction, the second through holes are arranged in a plurality of groups, the second through holes in each group are arranged along the diameter direction of the sealing ring, the rotating ring is in contact with the sealing ring and in running fit, a limiting shaft is connected inside the sealing ring in a rotating mode, the limiting shaft is arranged along the axis direction of the sealing ring, a round hole matched with the limiting shaft is formed in the pressing ring, the limiting shaft penetrates through the round hole and is in sliding fit with the pressing ring, a guide groove and a limiting groove are formed in the outer peripheral surface of the limiting shaft, the limiting groove is in a spiral shape, the guide groove is in a horizontal shape, the guide groove is communicated with the guide groove, a limiting block is fixedly connected to the inner wall of the round hole, the limiting block is in sliding fit with the limiting groove and the guide groove, a transmission tooth is arranged on the outer side of the rotating ring, a gear is fixedly sleeved on the outer side of the limiting shaft, and the gear is meshed with the transmission tooth.
2. The graphite electrode inspection device according to claim 1, wherein: one side of the connecting plate, which is far away from the air bag, is fixedly connected with a rotating shaft, and one end of the rotating shaft extends to the outer side of the sleeve and is fixedly connected with a crank.
3. The graphite electrode inspection device according to claim 1, wherein: the outer peripheral surface of the sleeve is provided with a positioning groove, the inner peripheral surface of the sealing ring is fixedly connected with a positioning block, and the positioning block is slidably connected inside the positioning groove.
4. The graphite electrode inspection device according to claim 1, wherein: the outside cover of spacing axle is equipped with the second spring, the second spring sets up between clamping ring and sealing ring.
5. The graphite electrode inspection device according to claim 1, wherein: the outer side peripheral surface of the sealing ring is fixedly connected with a sliding plate, a fixed frame is sleeved on the outer side sliding sleeve of the sliding plate, and fastening bolts are engaged with two sides of the fixed frame in a threaded manner.
6. The graphite electrode inspection device according to claim 1, wherein: the pressure ring is provided with a gas pressure sensor on one side surface close to the connecting plate, the output end of the gas pressure sensor is electrically connected with a controller, and the controller is electrically connected with an external display.
7. A graphite electrode inspection apparatus as claimed in claim 2, wherein: the connecting plate is close to the first snap ring of fixedly connected with on the side of pivot, the sleeve is close to the one end fixedly connected with second snap ring of connecting plate, the second snap ring rotates the outside of connecting in first snap ring.
CN202310159378.5A 2023-02-24 2023-02-24 Graphite electrode detection device Active CN115854937B (en)

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CN117308793B (en) * 2023-10-16 2024-03-19 江苏江龙新材料科技有限公司 Graphite electrode testing platform

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