Opening and closing mechanism and intelligent mutual inductor verification device

Abstract

The utility model discloses an opening and closing mechanism and an intelligent mutual inductor verification device, and relates to the technical field of electric power test equipment. Comprising a fixing frame, a sliding rail arranged on the inner side of the fixing frame, a pressing piece arranged on the side wall of the sliding rail, a gear arranged on one side of the pressing piece, a pressing piece arranged on the end face of the gear, a reset spring arranged on one side of the pressing piece and a buckling piece arranged on the other side of the pressing piece. The beneficial effects of the utility model are that the box cover and the box body can be opened and closed by simple operation through the cooperation between the pressing piece and the buckling piece, the operation is simpler, the operation of workers is facilitated, the operation burden of the workers is reduced to a certain extent, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power testing equipment, in particular to an opening and closing mechanism and an intelligent transformer calibration device. Background Art

[0002] Power voltage transformers and current transformers are the signal sources for power system control, protection and measurement. The safe and accurate operation of voltage transformers and current transformers is the basic condition for accurate energy metering. According to relevant national metrology laws, regulations and verification procedures, it is necessary to carry out mandatory verification of power voltage transformers and current transformers operating on site.

[0003] At present, the transformer tester used for on-site verification of power transformers has a large size due to the integration of multiple modules. In addition, due to the limitation of the size of the equipment, the transformer tester is generally not provided with a communication unit, or the communication unit is arranged outside the transformer tester. When data is to be transmitted, an external communication unit is required; therefore, the transformer tester is large in size, poor in portability, and it is difficult to integrate the communication unit, which makes the data transmission efficiency slow; at the same time, it is inconvenient to open the box to activate the equipment, and the box 2 and the box cover are closed together, which is troublesome to operate. Utility Model Content

[0004] In view of the above-mentioned prior art problems, the present utility model is proposed.

[0005] The utility model aims to provide an opening and closing mechanism, and aims to solve the problem that the existing box body and the box cover are stuck together after closing, which makes it inconvenient for staff to open the box cover.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: an opening and closing mechanism, which includes a box body;

[0007] Box cover;

[0008] The limiting unit includes a fixing frame, a slide rail arranged inside the fixing frame, a pressing member arranged on the side wall of the slide rail, a gear arranged on one side of the pressing member, a pressing member arranged on the end surface of the gear, a return spring arranged on one side of the pressing member, and a buckle arranged on the other side of the pressing member;

[0009] The fixing frame is arranged on the end surface of the box body; and the buckle is arranged on the end surface of the box cover.

[0010] As a preferred solution of the opening and closing mechanism of the utility model, wherein: the fixing frame includes a first through slot arranged on the top thereof, a second through slot arranged on one side of the first through slot, and a fixing shaft arranged inside the fixing frame;

[0011] The pressing member comprises a rack, a connecting rod arranged at the end of the rack, a button arranged at the top end of the connecting rod, and a lifting spring arranged at the outer side of the connecting rod.

[0012] As a preferred solution of the opening and closing mechanism of the utility model, wherein: the rack matches the slide rail; the connecting rod penetrates the fixing frame and extends outward; the lifting spring is arranged between the fixing frame and the button.

[0013] As a preferred solution of the opening and closing mechanism of the utility model, wherein: the pressing member includes a limit block, a lifting block arranged at the end of the limit block, and a fixing rod arranged at both ends of the limit block;

[0014] The limiting block includes an arc surface arranged at an end thereof.

[0015] As a preferred solution of the opening and closing mechanism of the utility model, wherein: the rack is meshed with the gear; the gear is connected to the fixing rod;

[0016] The interior of the fixing rod is a hollow structure, and the fixing rod is sleeved on the outside of the fixing shaft.

[0017] As a preferred solution of the opening and closing mechanism of the utility model, wherein: the buckle member includes a detour portion arranged at its end;

[0018] The buckle member passes through the second through slot and extends to the inner side of the fixing frame;

[0019] The lifting block passes through the first through slot and extends outward; the surface of the lifting block contacts the surface of the buckle.

[0020] As a preferred solution of the opening and closing mechanism of the utility model, wherein: the detour portion matches the arc surface;

[0021] The end of the return spring is welded and fixed to the end of the limit block.

[0022] The beneficial effect of the opening and closing mechanism of the utility model is that through the cooperation between the set clamping part and the snap fastener, the box cover and the box body can be opened and closed through simple operation, which is simpler to operate and convenient for workers to operate, thus reducing the operating burden of the workers to a certain extent and improving work efficiency.

[0023] Another object of the utility model is to provide an intelligent transformer calibration device, which aims to solve the problems that the existing transformer calibrators are large in size, poor in portability, and difficult to integrate a communication unit, resulting in slow data transmission efficiency.

[0024] In order to solve the above technical problems, the utility model also provides the following technical solutions: an intelligent transformer calibration device, which includes an opening and closing mechanism; and a human-computer interaction module, including a touch screen and a screen assembly;

[0025] A mainboard, on which a basic function module, a data acquisition module, a data conversion module, a central processing module and a communication module are integrated;

[0026] A power module, including a plurality of lithium batteries connected in series;

[0027] Binding Posts.

[0028] As a preferred solution of the intelligent transformer calibration device of the utility model, wherein: the terminal is connected to the data acquisition module;

[0029] The central processing module includes a DSP controller, and the DSP controller is connected to the data acquisition module and the communication module respectively.

[0030] As a preferred solution of the intelligent transformer calibration device of the utility model, wherein: the central processing module further includes an encryption unit, and the encryption unit is used to encrypt the data transmitted from the data acquisition module to the central processing module;

[0031] The communication module includes a built-in communication unit connected to the central processing module.

[0032] The beneficial effects of the intelligent transformer calibration device of the utility model are: it can effectively reduce the volume of the intelligent transformer calibration device, improve the portability of the intelligent transformer calibration device, and integrate a communication module to improve the data transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of the closed structure in the utility model.

[0035] Figure 2 It is a schematic diagram of the opening structure in the utility model.

[0036] Figure 3 It is a schematic diagram of the connection structure of the limiting unit in the utility model.

[0037] Figure 4It is a schematic diagram of the explosion structure of the limiting unit in the utility model.

[0038] Figure 5 It is a schematic diagram of the structure of the pressing member in the utility model.

[0039] Figure 6 It is a flowchart of the utility model.

[0040] Figure 7 It is the workflow diagram in the utility model. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0042] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0044] Example 1

[0045] Reference Figure 1 to Figure 5 , which is the first embodiment of the utility model, and this embodiment provides an opening and closing mechanism, including: a box body 100; a box cover 200; a limiting unit 300, including a fixing frame 301, a slide rail 302 arranged on the inner side of the fixing frame 301, a pressing piece 303 arranged on the side wall of the slide rail 302, a gear 304 arranged on one side of the pressing piece 303, a pressing piece 305 arranged on the end face of the gear 304, a return spring 306 arranged on one side of the pressing piece 305, and a buckle 307 arranged on the other side of the pressing piece 305; the fixing frame 301 is welded and fixed to the end face of the box body 100; the buckle 307 is welded and fixed to the end face of the box cover 200.

[0046] Preferably, the box body 100 and one end of the box cover 200 are hinged and rotated by a set hinge, so that the box cover 200 can be rotated to open the box body 100; the interior of the set fixing frame 301 is a hollow structure, the set slide rail 302 is located on the inner wall of the fixing frame 301, and the slide rail 302 and the fixing frame 301 are welded and fixed; the set pressing piece 303 is located inside the slide rail 302 and slides, the pressing piece 303 cooperates with the gear 304, the movement of the pressing piece 303 can drive the gear 304 to rotate, and the gear 304 and the clamping piece 305 are integrally formed; the rotation of the gear 304 drives the clamping piece 305 to rotate; the clamping piece 305 rotates in a direction away from the buckle 307 and compresses the reset spring 306, so that the buckle 307 can be separated from the interior of the fixing frame 301, and then contact the box cover 200 and the box body 100 to be fixed.

[0047] When in use, when the box body 100 needs to be removed, the box cover 200 is flipped over so that the fastener 307 connected to the end of the box cover 200 is inserted into it, and the end of the fastener 307 squeezes the clamping member 305, and the clamping member 305 is flipped to one side to make room for the fastener 307; when the fastener 307 is inserted into the fixing frame 301, the reset spring 306 is reset and pushes the clamping member 305 and the fastener 307 to engage with each other; thus, the positions of the clamping member 305 and the fastener 307 are fixed, and then the box cover 200 is closed. When the box 100 needs to be opened, the pressing piece 303 is pushed to move downward; the movement of the pressing piece 303 drives the gear 304 matched with it to rotate, and the rotation of the gear 304 drives the clamping piece 305 to rotate, and the clamping piece 305 flips to the side away from the latch 307, and then the latch 307 and the clamping piece 305 are not in contact, the limit between the latch 307 and the clamping piece 305 is released, and then the box cover 200 is flipped over, so as to open the box 100.

[0048] In summary, by setting the limit unit 300, it is convenient for the staff to close and open the box 100 more quickly, which is convenient for the staff to operate, reduces the labor burden of the staff, and improves work efficiency.

[0049] Example 2

[0050] Reference Figure 1 to Figure 5, which is the second embodiment of the utility model, comprises: the fixing frame 301 comprises a first through slot 301a arranged at the top thereof, a second through slot 301b arranged at one side of the first through slot 301a, and a fixing shaft 301c arranged inside the fixing frame 301; the pressing member 303 comprises a rack 303a, a connecting rod 303b arranged at the end of the rack 303a, a button 303c arranged at the top of the connecting rod 303b, and a lifting spring 303d arranged outside the connecting rod 303b; the rack 303a cooperates with the slide rail 302;

[0051] The connecting rod 303b penetrates the fixing frame 301 and extends outwards; the lifting spring 303d is arranged between the fixing frame 301 and the button 303c; the limiting block 305a includes an arc surface 305a-1 arranged at its end.

[0052] Preferably, the first through groove 301a and the second through groove 301b are both located on the top surface of the fixed frame 301; one end of the rack 303a cooperates with the slide rail 302, and one end of the rack 303a slides inside the slide rail 302; the other end of the rack 303a has a toothed structure; through the engagement between the rack 303a and the gear 304, the movement of the rack 303a can drive the gear 304 to rotate; the connecting rod 303b plays the role of connecting the button 303c with the rack 303a; by pressing the button 303c, the rack 303a can be driven to move downward; the button 303c can compress the lifting spring 303d, and the resilience of the lifting spring 303d can reset the button 303c, which is convenient for the staff to press the button 303c next time; the lifting spring 303d is movably arranged on the outside of the connecting rod 303b.

[0053] Furthermore, the rack 303a is meshed with the gear 304; the gear 304 is connected to the fixed rod 305c; the fixed rod 305c is hollow inside, and the fixed rod 305c is sleeved on the outside of the fixed shaft 301c;

[0054] The buckle 307 includes a detour portion 307a disposed at its end; the buckle 307 penetrates the second through slot 301b and extends to the inner side of the fixing frame 301; the lifting block 305b penetrates the first through slot 301a and extends outward; the surface of the lifting block 305b contacts the surface of the buckle 307;

[0055] The detour portion 307a matches with the arc surface 305a-1;

[0056] The end of the return spring 306 is fixedly welded to the end of the limiting block 305a.

[0057] Preferably, the fixed rods 305c are symmetrically arranged at both ends of the limit block 305a, the fixed rods 305c are sleeved outside the fixed shaft 301c, the fixed rods 305c rotate around the axis direction of the fixed shaft 301c, and the gear 304 is arranged at the end position of one group of fixed rods 305c;

[0058] The structure of the buckle 307 is an L-shaped structure. The end of the buckle 307 is provided with a detour portion 307a bent inwardly. The detour portion 307a cooperates with the arc surface 305a-1, so that the pressing member 305 and the buckle 307 can be closely attached together, thereby ensuring the fixing of the positions of the pressing member 305 and the buckle 307; the buckle 307 passes through the second through groove 301b and extends to the inside of the fixing frame 301;

[0059] The lifting block 305b is set at the top corner of the limit block 305a. The lifting block 305b is a cam-shaped structure. As the limit block 305a rotates, the lifting block 305b can rotate to contact the surface of the fastener 307, and then lift the fastener 307, so that the box cover 200 can be lifted up, so that a gap is generated between the box cover 200 and the box body 100, which is convenient for the staff to open the box body 100; the reset spring 306 can push the clamping piece 305 to reset, which is convenient for the staff to connect the fastener 307 with the clamping piece 305 next time, thereby facilitating the staff to operate and reducing the labor burden of the staff.

[0060] When in use, the staff flips over the box cover 200, and the latch 307 passes through the second through groove 301b and enters the interior of the fixing frame 301, as the box cover 200 continues to flip; the end of the latch 307 squeezes the limit block 305a; the limit block 305a rotates around the axial direction of the fixed shaft 301c through the fixing rod 305c, and the rotation of the limit block 305a drives and compresses the return spring 306; as the latch 307 continuously squeezes the pressing member 305, when the detour portion 307a corresponds to the arc surface 305a-1, the return spring 306 is no longer compressed and resets, and the return spring 306 pushes the pressing member 305 and the latch 307 to clamp together; so that the box cover 200 and the box body 100 can be locked and closed; when the box body 100 needs to be opened, by pressing the button 303c, the button 303c activates the lifting spring The spring 303d is compressed, and the rack 303a moves to drive the gear 304 to rotate. The rotation of the gear 304 drives the limit block 305a to rotate, and the limit block 305a rotates to the side away from the latch 307; the limit block 305a rotates while the lifting block 305b is driven to rotate, and the lifting block 305b rotates and passes through the first through groove 301a and extends outward, and the lifting block 305b contacts the surface of the latch 307 and lifts the latch 307, thereby making the latch 307 and the pressing member 305 non-contact; so that there is a certain gap between the box cover 200 and the box body 100, so that it is convenient for the staff to open the box body 100; release the pressing on the button 303c, the lifting spring 303d drives the rack 303a to reset, and the reset spring 306 pushes the pressing member 305 to reset, which can better facilitate the staff to perform the closing operation next time.

[0061] In summary, by cooperating between the clamping member 305 and the fastener 307, the box cover 200 and the box body 100 can be opened and closed through simple operations, which makes the operation simpler and convenient for workers to operate, reduces the operating burden of workers to a certain extent, and improves work efficiency.

[0062] Example 3

[0063] Reference Figure 2 , Figure 6 and Figure 7 , which is the third embodiment of the utility model, and this embodiment further provides an intelligent transformer calibration device, including; a human-computer interaction module 400, including a touch screen and a screen assembly; a main board, on which a basic function module, a data acquisition module, a data conversion module, a central processing module and a communication module are integrated; a power supply module, including a plurality of lithium batteries connected in series; and a terminal.

[0064] Furthermore, a cavity is provided inside the box 100, and the human-computer interaction module 400 is embedded in the cavity; the main board is installed in the box 100, and the main board is located below the human-computer interaction module 400; the power module box 100 includes a plurality of lithium batteries connected in series, and the plurality of lithium batteries are installed in the cavity and are located around the main board; there are a plurality of terminals; a plurality of terminals are arranged on the top surface of the box 100, and some of the terminals are connected to the data acquisition module.

[0065] Furthermore, the central processing module includes a DSP controller, which is connected to the data acquisition module and the communication module respectively; the central processing module also includes an encryption unit, which is used to encrypt data transmitted from the data acquisition module to the central processing module; the communication module includes a built-in communication unit, which is connected to the central processing module.

[0066] Preferably, the communication module includes a built-in communication unit, which is connected to the central processing module; the communication module also includes a communication interface, which is arranged on the top surface of the box and connected to the built-in communication unit; the communication interface includes one or more of a USB interface, a serial communication interface and a Bluetooth communication interface.

[0067] The data acquisition module and the communication module are both connected to the central processing module; the data acquisition module consists of an ammeter, a voltmeter, an overcurrent and short-circuit protection device, and an isolation transformer; the data acquisition module collects dial meter signals and differential signals, and is used to collect voltage signals, current signals, differential pressure signals, and differential current signals of the voltage / current transformer and the load; the signal data collected by the data acquisition module is transmitted to the data and conversion module for processing.

[0068] The data conversion module is connected to both the data acquisition module and the central processing module to transmit the data from the data acquisition module to the central processing module; the data conversion module is a 16-bit high-speed analog-to-digital converter, which converts the voltage, current signals, differential pressure, and differential current signals collected by the data acquisition module through a high-precision AD conversion chip for digital-to-analog conversion, and then transmits them to the central processing module.

[0069] The central processing module processes the data from the data conversion module, and processes the test data into a unified and standard format, and transmits the data from the central processing module to the communication module, and the communication module transmits the test data to the host computer and / or the handheld terminal. In this embodiment, the communication module transmits the test data to the host computer; the host computer is pre-configured with mutual inductor verification management software, so as to facilitate the generation of original records and verification / calibration reports that meet the specified requirements; data is automatically and efficiently transmitted, and the storage is highly automated.

[0070] Furthermore, the human-computer interaction module 400 is connected to the central processing template; the human-computer interaction module is arranged on the box 1, and includes a touch screen and a screen assembly; the touch screen is embedded in the top surface of the box 100; the screen assembly is used to support the normal operation of the touch screen, and it is arranged in the cavity; the touch screen has high resolution and is touchable; it can display test results, time, power, etc.; it can also be used to consult regulations and specifications, and test wiring diagrams; the human-computer interaction unit is used to manually set test parameters, including transformer / load type, range, accuracy level, capacity and power factor, etc., making the operation more convenient and quick.

[0071] Furthermore, multiple lithium batteries are fixed in the cavity and arranged around the mainboard. Multiple lithium batteries are used to fully utilize the space in the cavity and reduce the volume of the box. Pure lithium batteries can also bring more stable and accurate measurement data, and facilitate on-site verification work.

[0072] A charging interface is provided on the top surface of the box body 100, and the charging interface is connected to the lithium battery. The lithium battery is connected to an external power source through the charging interface to charge the lithium battery, wherein the charging interface is an AC220V interface; a charging display light is also provided on the top surface of the box body 100, and displays blue when the lithium battery is in an under-powered state, displays red when in a charging state, and displays green when fully charged; a power switch is provided on the top surface of the box body 100, and is connected to the lithium battery to control the switch of the lithium battery.

[0073] Furthermore, the plurality of terminals are To, Tx, a, x, K, D, and ground terminals, which are used to lead out voltage, current, differential pressure, differential current signals, and ground protection. The To, Tx, a, x, K, and D terminals are connected to the data acquisition module, and the ground terminal is connected to the box 100, the earth, and the D terminal.

[0074] Furthermore, the central processing module includes a DSP controller and an encryption unit; the DSP controller is connected to the data acquisition module and the communication module; the DSP controller is used for data processing, communication interface setting, state control and data storage; and its main frequency is not less than 100MHz.

[0075] The encryption unit is used to encrypt the data transmitted from the data acquisition module to the central processing module; the data transmitted to the central processing module is divided into multiple blocks of 128 bits in size and multiple groups, and encrypted one by one; the specific process is: read the data and cache it, perform AES encryption, output the serial port and cache it, and the communication encryption is completed.

[0076] The encrypted data is transmitted to the host computer through the communication module, and the host computer is equipped with a decryption unit, which decrypts the encrypted data through the decryption unit; the specific decryption process is: read the serial port and cache, perform AES decryption, output data and cache, and the communication decryption is completed; thus, the data transmission from the central processing module to the host computer is completed. The encryption and decryption process ensures the security of data transmission.

[0077] The communication interface includes one or more of a USB interface, a serial communication interface and a Bluetooth communication interface; in this embodiment, the communication interface includes a USB interface, a serial communication interface and a Bluetooth communication interface; and the communication interface also includes an Ethernet communication interface; therefore, data can be transmitted to the host computer with the help of a USB flash drive, or data can be transmitted to the host computer with the help of a serial port line, or data can be transmitted to the host computer with the help of Bluetooth.

[0078] Preferably, in order to facilitate understanding of the use process of the intelligent transformer calibration device, the error calibration process of the intelligent transformer calibration device is introduced as follows:

[0079] (1) Carry out test wiring;

[0080] (2) Calculation of amplitude and phase of dial indicator channel;

[0081] (3) Calculation of differential pressure / differential flow channel amplitude and phase;

[0082] (4) Calculation of ratio difference and angle difference;

[0083] (5) Rate control calculation;

[0084] (5) The test data is transmitted to the human-computer interaction module 400 and displayed on the human-computer interaction interface;

[0085] (7) Method 1: Use a USB flash drive to upload data to the host computer through the USB interface in the communication module; the host computer transformer calibration management software automatically generates original records and test reports;

[0086] Method 2: With the help of a serial line, upload the data to the host computer through the serial communication interface in the communication module; the original records and test reports are automatically generated through the transformer calibration management software on the host computer;

[0087] Method 3: With the help of Bluetooth, the data is encrypted and uploaded to the host computer such as a handheld terminal, PAD, PC terminal, etc. through the Bluetooth communication interface in the communication module; the host computer decrypts the data and automatically generates original records and test reports through the transformer calibration management software.

[0088] In summary, since the basic function module, data acquisition module, data conversion module, central processing module and communication module are all integrated on a mainboard and occupy a small volume, it is easier to design the structure of each component in the box, which is convenient for reducing the volume of the box; at the same time, the relatively large modules among the basic function module, data acquisition module, data conversion module, central processing module and communication module are located at the edge of the mainboard, thus avoiding the space required for the human-computer interaction module, reducing the gap between the human-computer interaction module and the mainboard, and facilitating the miniaturization design of the box, reducing the volume of the box, and improving portability;

[0089] Since the main board integrates a data acquisition module, a data conversion module, a central processing module and a communication module, when the transformer is calibrated, the data measured by the data acquisition module is converted into analog by the data conversion module and then transmitted to the central processing module. The test data can be transmitted to the host computer in a unified and standard format using the communication module, which facilitates data collection and sorting, eliminates the need for manual recording, input, output of data, and reporting, reduces human influence factors, improves test accuracy, reduces manpower and material resources, improves test efficiency, and promotes big data intelligent management of transformer error tests.

[0090] It is important to note that the above embodiments are only used to illustrate the technical solution of the utility model and are not intended to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. An opening and closing mechanism, characterized in that: include, Box (100); Box cover (200); The limiting unit (300) comprises a fixing frame (301), a slide rail (302) arranged on the inner side of the fixing frame (301), a pressing member (303) arranged on the side wall of the slide rail (302), a gear (304) arranged on one side of the pressing member (303), a pressing member (305) arranged on the end surface of the gear (304), a return spring (306) arranged on one side of the pressing member (305), and a buckle member (307) arranged on the other side of the pressing member (305); The fixing frame (301) is arranged on the end surface of the box body (100); and the buckle (307) is arranged on the end surface of the box cover (200).

2. The opening and closing mechanism according to claim 1, characterized in that: The fixing frame (301) comprises a first through-groove (301a) arranged at the top thereof, a second through-groove (301b) arranged at one side of the first through-groove (301a), and a fixing shaft (301c) arranged inside the fixing frame (301); The pressing member (303) comprises a rack (303a), a connecting rod (303b) arranged at the end of the rack (303a), a button (303c) arranged at the top of the connecting rod (303b), and a lifting spring (303d) arranged on the outside of the connecting rod (303b).

3. The opening and closing mechanism according to claim 2, characterized in that: The rack (303a) cooperates with the slide rail (302); the connecting rod (303b) penetrates the fixing frame (301) and extends outward; and the lifting spring (303d) is arranged between the fixing frame (301) and the button (303c).

4. The opening and closing mechanism according to claim 3, characterized in that: The pressing member (305) comprises a limit block (305a), a lifting block (305b) arranged at the end of the limit block (305a), and fixing rods (305c) arranged at both ends of the limit block (305a); The limiting block (305a) comprises an arc surface (305a-1) arranged at an end thereof.

5. The opening and closing mechanism according to claim 4, characterized in that: The rack (303a) is meshed with the gear (304); the gear (304) is connected to the fixing rod (305c); The interior of the fixing rod (305c) is a hollow structure, and the fixing rod (305c) is sleeved on the outside of the fixing shaft (301c).

6. The opening and closing mechanism according to any one of claims 4 and 5, characterized in that: The buckle (307) comprises a detour portion (307a) arranged at an end thereof; The buckle (307) passes through the second through slot (301b) and extends to the inner side of the fixing frame (301); The lifting block (305b) passes through the first through slot (301a) and extends outward; the surface of the lifting block (305b) contacts the surface of the buckle (307).

7. The opening and closing mechanism according to claim 6, characterized in that: The detour portion (307a) matches the arc surface (305a-1); The end of the return spring (306) is welded and fixed to the end of the limit block (305a).

8. An intelligent transformer calibration device, characterized in that: comprising the opening and closing mechanism according to any one of claims 1 to 7; and A human-computer interaction module (400), comprising a touch screen and a screen assembly; A mainboard, on which a basic function module, a data acquisition module, a data conversion module, a central processing module and a communication module are arranged; A power module, including a plurality of lithium batteries connected in series; Binding Posts.

9. The intelligent transformer calibration device according to claim 8, characterized in that: The terminal is connected to the data acquisition module; The central processing module includes a DSP controller, and the DSP controller is connected to the data acquisition module and the communication module respectively.

10. The intelligent transformer calibration device according to claim 9, characterized in that: The central processing module further comprises an encryption unit, which is used to encrypt data transmitted from the data acquisition module to the central processing module; The communication module includes a built-in communication unit connected to the central processing module.

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