An electric energy meter calibrating device

Abstract

The application discloses a kind of electric energy meter verification device, comprising: support plate, telescopic rod, bottom plate, top plate, linkage plate, test probe and ceramic cylinder;Bottom plate is set on the upside of support plate, top plate is set above bottom plate, and movable linkage plate is arranged between top plate and bottom plate, telescopic rod is set on support plate;Bottom plate and top plate are also parallelly arranged with multiple test probes, one end of test probe extends bottom plate, the other end of test probe is connected with linkage plate;Elastic compression mechanism is arranged between the inner end of test probe and linkage plate, and elastic compression mechanism includes ceramic cylinder and compression spring.The application is provided with elastic compression mechanism between the inner end of test probe and linkage plate, which can effectively avoid the situation that test probe and terminal hole contact badly in electric energy meter verification process, so as to effectively improve the accuracy and reliability of electric energy meter verification.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric energy meter calibration, and in particular to an electric energy meter calibration device. BACKGROUND

[0002] As an electric energy metering device, an electric energy meter needs to be tested for accuracy during production, before installation and during use, or calibrated according to national regulations and relevant standards. The calibration and testing process of an electric energy meter usually includes three steps: 1. positioning and wiring of the electric energy meter, in which the test probe set of the calibration device is connected to the terminal hole set of the electric energy meter; 2. calibration and testing of the electric energy meter; and 3. separation of the calibrated electric energy meter from the calibration device.

[0003] When the test probe set of the existing electric energy meter calibration device is inserted into the terminal hole set of the electric energy meter to be tested, some probes may not be in good contact with the terminal holes, which makes it difficult for the existing electric energy meter calibration device to accurately calibrate the electric energy meter. SUMMARY

[0004] The present application provides an electric energy meter calibration device to solve the technical problem that the existing electric energy meter calibration device is difficult to accurately calibrate the electric energy meter.

[0005] An embodiment of the present application provides an electric energy meter calibration device, which comprises:

[0006] a support plate, an extension rod, a bottom plate, a top plate, a linkage plate, a test probe and a ceramic cylinder;

[0007] The bottom plate is arranged on the upper side of the support plate,

[0008] The top plate is arranged above the bottom plate, and a movable linkage plate is arranged between the top plate and the bottom plate,

[0009] The extension rod is arranged on the support plate and used to drive the linkage plate to slide between the bottom plate and the top plate;

[0010] A plurality of test probes are arranged in parallel between the bottom plate and the top plate, one end of each test probe extends out of the bottom plate, and the other end of each test probe is connected to the linkage plate;

[0011] An elastic compression mechanism is arranged between the inner end of each test probe and the linkage plate, and the elastic compression mechanism comprises a ceramic cylinder and a compression spring, the inner end of the ceramic cylinder is connected to the linkage plate, the outer end of the ceramic cylinder extends out of the bottom plate, the center of the end plate of the inner end of the ceramic cylinder is provided with a plurality of guide rod holes, a guide rod is arranged in each guide rod hole, a compression spring is sleeved on one end of the guide rod, the other end of the guide rod extends out of the ceramic cylinder and is provided with a pin hole, and a limiting pin rod is inserted into the pin hole to prevent the test probe from being separated from the ceramic cylinder.

[0012] Further, a limiting groove is arranged on the outer wall of the test probe, and a limiting protrusion corresponding to the limiting groove is arranged on the inner wall of the ceramic barrel.

[0013] Further, two positioning steps are arranged on the outer wall of the inner end of the ceramic barrel, and the inner end of the ceramic barrel is connected to the linkage plate through two locking blocks.

[0014] Further, a lubricating plate is further arranged on the support plate, and a plurality of lubricating holes corresponding to the test probe are arranged on the lubricating plate.

[0015] Further, an annular oil groove and a plurality of oil storage cavities are arranged in the lubricating hole, an oil distribution ring is arranged in the annular oil groove, each of the oil storage cavities is arranged on the corresponding lubricating hole, and each of the oil storage cavities is independently arranged.

[0016] Further, the inner end of the ceramic barrel is rotatably mounted on the linkage plate through two locking rings, and a probe rotating mechanism for driving the ceramic barrel to rotate when the test probe is inserted into the lubricating hole is further arranged on the bottom plate or the top plate.

[0017] Further, the probe rotating mechanism comprises a spiral guide groove and a limiting ring, a limiting structure for preventing the limiting ring from rotating is further arranged on the bottom plate or the top plate, the spiral guide groove is arranged on the outer wall of the ceramic barrel, and the spiral guide groove comprises a rotation guide groove and an axial guide groove, and the rotation guide groove and the axial guide groove are communicated.

[0018] The limiting ring is sleeved on the ceramic barrel, a limiting protrusion extending into the spiral guide groove is arranged on the inner wall of the limiting ring, a limiting compression spring is further sleeved on the ceramic barrel between the locking ring and the limiting ring, one end of the limiting compression spring abuts against the locking ring, and the other end of the limiting compression spring abuts against the limiting ring.

[0019] Further, a limiting block is further arranged on the outer wall of the limiting ring, and a limiting sliding groove parallel to the ceramic barrel is arranged on the top plate, the limiting block is inserted into the limiting sliding groove to prevent the limiting ring from rotating.

[0020] Further, an end of the limiting sliding groove is further provided with a limiting baffle for preventing the limiting ring from moving.

[0021] Further, a first lower support plate and a second lower support plate are arranged on the bottom plate, semicircular grooves corresponding to the ceramic barrel are arranged on the first lower support plate and the second lower support plate, a first upper support plate and a second upper support plate are arranged on the top plate, and semicircular grooves corresponding to the ceramic barrel are arranged on the first upper support plate and the second upper support plate.

[0022] In the embodiment of the present application, the elastic compression mechanism is arranged between the inner end of the test probe and the linkage plate, so that the test probe and the ceramic cylinder are elastically connected. When the telescopic rod drives each test probe to extend simultaneously, the end of each test probe is first abutted against the bottom of the terminal hole after each test probe is inserted into the terminal hole of the electric energy meter to be tested. The telescopic rod is further extended by a preset length, so that the compression spring on each test probe is compressed, thereby enabling each test probe to be in reliable contact with each terminal hole. The elastic connection between the test probe and the ceramic cylinder can effectively avoid the poor contact between the test probe and the terminal hole during the electric energy meter testing process, thereby effectively improving the accuracy and reliability of the electric energy meter testing. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic view of the electric energy meter testing device provided by the embodiment of the present application;

[0024] Figure 2 is a structural schematic view of the ceramic cylinder when it is moved to the right and extended;

[0025] Figure 3 is a structural schematic view of the electric energy meter testing device provided by the embodiment of the present application; Figure 1 is a partial enlarged view of the electric energy meter testing device A part provided by the embodiment of the present application;

[0026] Figure 4 is a partial enlarged view of the electric energy meter testing device B part provided by the embodiment of the present application; Figure 1

[0027] Figure 5 is another structural schematic view of the electric energy meter testing device provided by the embodiment of the present application;

[0028] Figure 6 is a structural schematic view of the internal structure of the electric energy meter testing device provided by the embodiment of the present application;

[0029] Figure 7 is a structural schematic view of the top plate provided by the embodiment of the present application;

[0030] Figure 8 is a structural schematic view of the ceramic cylinder provided by the embodiment of the present application. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] ​In the description of the present application, it should be understood that the terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0033] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] Please refer to Figures 1-8 The embodiment of the present application provides an electric energy meter calibration device, comprising:

[0035] The support plate 10, the telescopic rod 11, the bottom plate 20, the top plate 30, the linkage plate 40, the test probe 50 and the ceramic barrel 60;

[0036] The bottom plate 20 is arranged on the upper side of the support plate 10,

[0037] The top plate 30 is arranged above the bottom plate 20, and the movable linkage plate 40 is arranged between the top plate 30 and the bottom plate 20,

[0038] The telescopic rod 11 is arranged on the support plate 10, and is used for driving the linkage plate 40 to slide between the bottom plate 20 and the top plate 30;

[0039] A plurality of test probes 50 are arranged in parallel between the bottom plate 20 and the top plate 30, one end of the test probe 50 extends out of the bottom plate 20, and the other end of the test probe 50 is connected with the linkage plate 40;

[0040] An elastic pressing mechanism is arranged between the inner end of the test probe 50 and the linkage plate 40, the elastic pressing mechanism comprises the ceramic barrel 60 and the pressing spring 52, the inner end of the ceramic barrel 60 is connected with the linkage plate 40, the outer end of the ceramic barrel 60 extends out of the bottom plate 20, the center of the end plate of the inner end of the ceramic barrel 60 is provided with a plurality of guide rod 51 holes, the guide rod 51 is arranged in the guide rod 51 hole, the pressing spring 52 is sleeved on one end of the guide rod 51, the other end of the guide rod 51 extends out of the ceramic barrel 60 and is provided with a pin hole 53, and the limit pin rod is inserted in the pin hole 53 to prevent the test probe 50 from being separated from the ceramic barrel 60.

[0041] In the embodiment of the present application, the elastic compression mechanism is arranged between the inner end of the test probe 50 and the linkage plate 40, so that the test probe 50 and the ceramic cylinder 60 are elastically connected. When the telescopic rod 11 drives each test probe 50 to extend simultaneously, the end of each test probe 50 first abuts against the bottom of the terminal hole of the electric energy meter to be tested, and then the telescopic rod 11 extends by a preset length, so that the compression spring 52 on each test probe 50 is compressed, thereby ensuring that each test probe 50 can reliably contact each terminal hole. The elastic connection between the test probe 50 and the ceramic cylinder 60 can effectively avoid the poor contact between the test probe and the terminal hole during the electric energy meter testing process, thereby effectively improving the accuracy and reliability of the electric energy meter testing.

[0042] In one embodiment, a limiting groove 54 is arranged on the outer wall of the test probe 50, and a limiting protrusion 631 corresponding to the limiting groove 54 is arranged on the inner wall of the ceramic cylinder 60.

[0043] Please refer to Figure 8 In the embodiment of the present application, the test probe 50 is a cylindrical test probe 50, and a limiting groove 54 is arranged on the outer wall of the test probe 50. The limiting protrusion 631 on the ceramic cylinder 60 is used to prevent the test probe 50 from rotating relative to the ceramic cylinder 60, so that the test probe 50 can only move axially in the ceramic cylinder 60.

[0044] Optionally, a limiting groove 54 is arranged on the outer wall of the test probe 50, and the limiting groove 54 is an inner recessed groove formed by cutting the cylindrical outer wall in the axial direction, so as to improve the processing convenience.

[0045] In one embodiment, two positioning steps are arranged on the outer wall of the inner end of the ceramic cylinder 60, and the inner end of the ceramic cylinder 60 is connected to the linkage plate 40 through two locking blocks.

[0046] In the embodiment of the present application, the cross section of the linkage plate 40 is square or rectangular, a detachable top cover is arranged on the upper side of the linkage plate 40, a circular hole is arranged on the side plate of the linkage plate 40 close to the test probe 50, the inner end of the ceramic cylinder 60 is arranged in the circular hole on the side plate of the test probe 50, and two locking rings 61 are respectively arranged on the inner and outer sides of the linkage plate 40, so as to facilitate the assembly of the end of the ceramic cylinder 60 and the linkage plate 40. Preferably, an external thread corresponding to the locking ring 61 is arranged on the outer wall of the inner end of the ceramic cylinder 60, an internal thread corresponding to the locking ring 61 is arranged on the locking ring 61, and the distance between the two positioning steps is greater than the sum of the thickness of the locking ring 61 and the thickness of the side plate of the linkage plate 40, so that when the two locking rings 61 are screwed with the outer wall of the ceramic cylinder 60, the ceramic cylinder 60 can rotate relative to the linkage plate 40. In another embodiment of the present application, the ceramic cylinder 60 can be locked on the linkage plate 40 through the two locking rings 61, so that the ceramic cylinder 60 cannot rotate.

[0047] In one embodiment, the support plate 10 is further provided with a lubricating plate, and the lubricating plate is provided with a plurality of lubricating holes 71 corresponding to the probes.

[0048] In the embodiment of the present application, the lubricating holes 71 are provided with conductive grease, and the test probes 50 can pass through the lubricating holes 71 when they move outwardly along with the linkage plate 40; in the embodiment of the present application, when the telescopic rods 11 are extended to drive the test probes 50 to extend simultaneously, the ends of the test probes 50 first pass through the lubricating holes 71 and then are inserted into the terminal holes of the electric energy meter to be tested, so that the test probes 50 can be coated with the conductive grease through the lubricating holes 71, the contact between the test probes 50 and the terminals can be enhanced when the test probes 50 are inserted into the terminal holes, the contact resistance between the test probes 50 and the terminals during the testing process can be greatly reduced, and thus the failure rate of the automatic testing process can be reduced.

[0049] On the other hand, the conductive grease can also prevent the test probes 50 and the terminals from being oxidized during the testing process, can effectively reduce the abrasion of the test probes 50, and thus can prolong the service life of the test probes 50; the conductive grease transferred to the terminals when the test probes 50 contact the terminals can also protect the terminals from being oxidized and corroded.

[0050] In one embodiment, the lubricating holes 71 are provided with annular oil grooves 72 and a plurality of oil storage cavities 74, the annular oil grooves 72 are provided with oil distribution rings 73, each of the oil storage cavities 74 is arranged on a corresponding lubricating hole 71, and each of the oil storage cavities 74 is independently arranged.

[0051] In the embodiment of the present application, each of the oil storage cavities 74 is arranged corresponding to a lubricating hole 71, so as to ensure the reliability of each probe and the stability of the test probes 50, and the independently arranged manner can also effectively avoid the electrical connection between adjacent test probes 50 through the conductive grease. The upper side of the lubricating plate 70 in the embodiment of the present application is further provided with a cover plate 75, and the cover plate 75 is provided with a plurality of oil injection holes 76 corresponding to the oil storage cavities 74 respectively, so as to facilitate the addition of the conductive grease to the oil storage cavities 74.

[0052] In one embodiment, the inner end of the ceramic cylinder 60 is rotatably mounted on the linkage plate 40 through two locking rings 61, and the bottom plate 20 or the top plate 30 is further provided with a probe rotating mechanism for driving the ceramic cylinder 60 to rotate when the test probes 50 are deeply inserted into the lubricating holes 71.

[0053] The embodiment of the present application can make the test probes 50 be located in the ceramic cylinder 60 when they are deeply inserted into the lubricating holes 71, so as to ensure the uniform coating of the conductive grease on the test probes 50.

[0054] In one embodiment, the probe rotating mechanism comprises a spiral guide groove 62 and a limiting ring 63, and the bottom plate 20 or the top plate 30 is further provided with a limiting structure for preventing the limiting ring 63 from rotating, the spiral guide groove 62 is arranged on the outer wall of the ceramic barrel 60, and the spiral guide groove 62 comprises a rotating guide groove 621 and an axial guide groove 622, and the rotating guide groove 621 and the axial guide groove 622 are communicated;

[0055] The limiting ring 63 is sleeved on the ceramic barrel 60, and the inner wall of the limiting ring 63 is provided with a limiting protrusion 631 extending into the spiral guide groove 62, and the ceramic barrel 60 is further sleeved with a limiting compression spring 64 between the lock ring 61 and the limiting ring 63, one end of the limiting compression spring 64 abuts against the lock ring 61, and the other end of the limiting compression spring 64 abuts against the limiting ring 63.

[0056] In one embodiment, the outer wall of the limiting ring 63 is further provided with a limiting block 632, and the top plate 30 is provided with a limiting sliding groove 301 parallel to the ceramic barrel 60, and the limiting block 632 is inserted into the limiting sliding groove 301 to prevent the limiting ring 63 from rotating.

[0057] Please refer to Figures 1-4 In the embodiment of the present application, when the telescopic rod 11 is not elongated to push the linkage plate 40, the limiting ring 63 is located at the end of the rotating guide groove 621, the limiting protrusion 631 on the inner wall of the limiting ring 63 is inserted into the right end of the rotating guide groove 621, the limiting block 632 on the outer wall of the limiting ring 63 is inserted into the limiting sliding groove 301 on the top plate 30, and the limiting compression spring 64 presses the limiting ring 63 against the right end of the rotating guide groove 621; when the telescopic rod 11 starts to elongate to push the linkage plate 40 to move rightward, the ceramic barrel 60, the test probe 50 and the limiting ring 63 move rightward together with the linkage plate 40, and the limiting compression spring 64 always presses the limiting ring 63 against the right end of the rotating guide groove 621, and the limiting ring 63 is stationary relative to the ceramic barrel 60; please refer to Figure 2When the ceramic cylinder 60, the test probe 50 and the limiting ring 63 move rightward together with the linkage plate 40 to the position where the limiting ring 63 abuts against the limiting baffle 302, the limiting ring 63 can no longer move rightward, and the end of the test probe 50 is about to be inserted into the lubricating hole 71; when the telescopic rod 11 continues to extend to push the linkage plate 40 to move rightward, the limiting compression spring 64 is further compressed, the limiting protrusion 631 on the inner wall of the limiting ring 63 cooperates with the rotary guide groove 621 on the outer wall of the ceramic cylinder 60, so that the ceramic cylinder 60 rotates and continues to extend rightward, the test probe 50 rotates and continues to extend rightward with the ceramic cylinder 60, and the end of the test probe 50 extends into the lubricating hole 71; when the ceramic cylinder 60 moves rightward so that the limiting protrusion 631 on the inner wall of the limiting ring 63 slides to the left end of the rotary guide groove 621 and enters the axial guide groove 622, the ceramic cylinder 60 can no longer rotate, at this time, the end of the test probe 50 has moved rightward and extended out of the lubricating hole 71, and the linkage plate 40 can continue to push the ceramic cylinder 60 to move rightward until the test probe 50 is inserted into the terminal hole of the electric energy meter to be tested; when the end of the test probe 50 abuts against the bottom of the terminal hole, the telescopic rod 11 continues to extend by a preset length, so that the compression spring 52 on each test probe 50 is compressed, thereby enabling each test probe 50 to reliably contact each terminal hole.

[0058] In one embodiment, the end of the limiting sliding groove 301 is further provided with a limiting baffle 302 for preventing the limiting ring 63 from moving.

[0059] Please refer to Figure 8 In one embodiment, when the test probe 50 is assembled with the ceramic cylinder 60, the compression spring 52 is first sleeved on the guide rod 51 at the left end of the test probe 50, then the left end of the test probe 50 is inserted into the ceramic cylinder 60 from the right end of the ceramic cylinder 60 until the test probe 50 passes through the hole of the guide rod 51 at the center of the end plate of the left end of the ceramic cylinder 60, and then the limiting pin is inserted into the pin hole 53 at the left end of the guide rod 51, thereby enabling the test probe 50 to be quickly installed in the ceramic cylinder 60; preferably, the guide rod 51 of each test probe 50 can be provided with a terminal for connecting with a power line, a signal line or the like, so as to facilitate the corresponding electrical connection according to the role of each test probe 50 in the electric energy meter testing operation. Preferably, please continue to refer to Figure 8When the limiting ring 63 is assembled with the ceramic barrel 60, first, the two locking rings 61 at the left end of the ceramic barrel 60 are removed, and the limiting ring 63 is sleeved on the outer wall of the ceramic barrel 60 from the right end of the ceramic barrel 60. Specifically, when the limiting ring 63 is sleeved, the limiting protrusions 631 on the inner wall of the limiting ring 63 are aligned with the end openings of the axial guide grooves 622 on the outer wall of the ceramic barrel 60, so that the limiting protrusions 631 on the inner wall of the limiting ring 63 are inserted into the axial guide grooves 622, and then the limiting ring 63 is moved to the right until the limiting protrusions 631 on the inner wall of the limiting ring 63 move along the axial guide grooves 622, the rotating guide grooves 621 to the right end of the rotating guide grooves 621, and then the limiting compression spring 64 is installed, so that the limiting ring 63 can be quickly installed on the ceramic barrel 60. Preferably, the length of the rotating guide groove 621 on the ceramic barrel 60 should ensure that the ceramic barrel 60 can rotate an angle greater than 360 degrees, that is, at least one rotation when the end of the test probe 50 passes through the lubricating hole 71, so that the end of the test probe 50 is uniformly coated with conductive grease.

[0060] In one embodiment, the bottom plate 20 is provided with a first lower support plate and a second lower support plate, and the first lower support plate and the second lower support plate are provided with semicircular grooves corresponding to the ceramic barrel 60. The top plate 30 is provided with a first upper support plate and a second upper support plate, and the first upper support plate and the second upper support plate are provided with semicircular grooves corresponding to the ceramic barrel 60, so that the ceramic barrel 60 is reliably positioned between the bottom plate 20 and the top plate 30, and reliably rotates between the bottom plate 20 and the top plate 30.

[0061] The embodiment of the present application has the following beneficial effects:

[0062] In the embodiment of the present application, the elastic compression mechanism is arranged between the inner end of the test probe 50 and the linkage plate 40, so that the test probe 50 and the ceramic barrel 60 are elastically connected. When each test probe 50 is inserted into each terminal hole of the electric energy meter to be tested, the end of the test probe 50 first abuts against the bottom of the terminal hole, and then the telescopic rod 11 is further extended by a predetermined length, so that the compression spring 52 on each test probe 50 is compressed, thereby ensuring that each test probe 50 can reliably contact each terminal hole. The elastic connection between the test probe 50 and the ceramic barrel 60 can effectively prevent the test probe from being in poor contact with the terminal hole during the electric energy meter testing process, thereby effectively improving the accuracy and reliability of the electric energy meter testing.

[0063] The above is the preferred embodiment of the present application. It should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements are also considered within the scope of protection of the present application.

Claims

1. A device for calibrating an electricity meter, characterized in that, include: Support plate, telescopic rod, base plate, top plate, linkage plate, test probe and ceramic cylinder; The base plate is disposed on the upper side of the support plate. The top plate is disposed above the bottom plate, and a movable linkage plate is provided between the top plate and the bottom plate; The telescopic rod is mounted on the support plate and is used to drive the linkage plate to slide between the bottom plate and the top plate; Multiple test probes are also arranged in parallel between the base plate and the top plate. One end of each test probe extends out of the base plate, and the other end of each test probe is connected to the linkage plate. An elastic clamping mechanism is provided between the inner end of the test probe and the linkage plate. The elastic clamping mechanism includes a ceramic cylinder and a clamping spring. The inner end of the ceramic cylinder is connected to the linkage plate. The outer end of the ceramic cylinder extends out of the bottom plate. A plurality of guide rod holes are provided at the center of the end plate of the inner end of the ceramic cylinder. A guide rod is provided in the guide rod hole. A clamping spring is sleeved on one end of the guide rod. The other end of the guide rod extends out of the ceramic cylinder and is provided with a pin hole. A limiting pin is inserted into the pin hole to prevent the test probe from detaching from the ceramic cylinder. The support plate is also provided with a lubrication plate, which is provided with a plurality of lubrication holes corresponding to the probe. The lubrication holes are provided with annular oil grooves and a plurality of oil storage chambers. An oil distribution ring is provided in the annular oil grooves. Each oil storage chamber is provided on the corresponding lubrication hole, and each oil storage chamber is independently provided. The inner end of the ceramic cylinder is rotatably mounted on the linkage plate via two locking rings. The bottom plate or the top plate is also provided with a probe rotation mechanism that drives the ceramic cylinder to rotate when the test probe penetrates the lubrication hole. The probe rotation mechanism includes a spiral guide groove and a limiting ring. The bottom plate or the top plate is also provided with a limiting structure to prevent the limiting ring from rotating. The spiral guide groove is provided on the outer wall of the ceramic cylinder. The spiral guide groove includes a rotating guide groove and an axial guide groove, which are connected. The limiting ring is sleeved on the ceramic cylinder, and the inner wall of the limiting ring is provided with a limiting protrusion that extends into the spiral guide groove. A limiting compression spring is also sleeved on the ceramic cylinder between the locking ring and the limiting ring. One end of the limiting compression spring abuts against the locking ring, and the other end of the limiting compression spring abuts against the limiting ring.

2. The electricity meter calibration device as described in claim 1, characterized in that, The outer wall of the test probe is provided with a limiting groove, and the inner wall of the ceramic cylinder is provided with a limiting protrusion corresponding to the limiting groove.

3. The electricity meter calibration device as described in claim 1, characterized in that, Two positioning steps are provided on the outer wall of the inner end of the ceramic cylinder, and the inner end of the ceramic cylinder is connected to the linkage plate through two locking blocks.

4. The electricity meter calibration device as described in claim 1, characterized in that, The outer wall of the limiting ring is also provided with a limiting block, and the top plate is provided with a limiting groove parallel to the ceramic cylinder. The limiting block is inserted into the limiting groove to prevent the limiting ring from rotating.

5. The electricity meter calibration device as described in claim 4, characterized in that, The end of the limiting groove is also provided with a limiting baffle to prevent the limiting ring from moving.

6. The electricity meter calibration device as described in claim 1, characterized in that, The base plate is provided with a first lower support plate and a second lower support plate, and the first lower support plate and the second lower support plate are provided with semi-circular grooves corresponding to the ceramic cylinder. The top plate is provided with a first upper support plate and a second upper support plate, and the first upper support plate and the second upper support plate are provided with semi-circular grooves corresponding to the ceramic cylinder.

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