Plug and meter

Abstract

The application relates to a plug-in connector and a meter. The plug-in connector is configured to be connected to a host and / or an expansion module, so as to detachably and electrically connect the host and the expansion module, or detachably and electrically connect two adjacent expansion modules. The plug-in connector comprises a shell and an electric connector. An installation cavity is formed in the shell, and a second limiting part is arranged on the shell. The electric connector is arranged in the installation cavity, and the electric connector has a first connecting part and a second connecting part outside the shell. Thus, the splicing step of the meter can be simplified, and the assembly efficiency of the meter is improved.

Description

Technical Field

[0001] This application relates to the field of electricity meter technology, and in particular to a connector and meter. Background Technology

[0002] Electricity meters require the ability to expand their circuits to meet the metering needs of multiple circuits. Multi-circuit meters are typically formed by assembling metering expansion modules onto a main unit. In related technologies, the main unit and expansion modules are usually connected via a plug-in structure for detachable connection. This requires the use of wiring harnesses or other electrical connectors to achieve the electrical connection between the main unit and the expansion modules, making the assembly process complex and inefficient. Utility Model Content

[0003] This application provides a connector and a meter. The connector enables detachable and electrical connections between the host and an expansion module, or between two adjacent expansion modules. This simplifies the assembly steps of the meter and improves the assembly efficiency of the meter, thereby at least partially solving the above-mentioned technical problems.

[0004] To achieve the above objectives, according to a first aspect of this application, a connector is provided, the connector being configured to connect to a host and / or an expansion module, for detachably and electrically connecting the host to the expansion module, or detachably and electrically connecting two adjacent expansion modules; wherein the connector includes: The housing has an internal mounting cavity; An electrical connector is disposed within the mounting cavity, the electrical connector having a first connecting portion and a second connecting portion located outside the housing.

[0005] Optionally, the housing includes: The first cover plate has a mounting groove. A second cover plate is connected to the first cover plate, and the second cover plate closes the mounting groove to form the mounting cavity; The first cover plate includes a main body, a first insertion part, and a second insertion part, wherein the first insertion part and the second insertion part are located at opposite ends on the same side of the main body.

[0006] Optionally, a first groove segment is formed in the main body, a second groove segment is formed in the first insertion part that communicates with one end of the first groove segment, and a third groove segment is formed in the second insertion part that communicates with the other end of the first groove segment. The first groove segment, the second groove segment, and the third groove segment together define the mounting groove. Wherein, a portion of the electrical connector extends through the second groove segment to form the first connection portion, and a portion of the electrical connector extends through the third groove segment to form the second connection portion.

[0007] According to a second aspect of this application, a measuring instrument is provided, including a main unit, an expansion module, and a connector as described above. Along a first direction, the expansion module abuts against the main unit. Along a second direction, a first slot is formed on one side of the main unit, and a second slot is provided on one side of the expansion module. A housing is connected within the first and second slots to allow the main unit and the expansion module to be detachably connected. A first connecting portion is electrically connected to a first connector of the main unit, and a second connecting portion is electrically connected to a second connector of the expansion module, for electrically connecting the main unit and the expansion module. The first direction and the second direction are set at an angle.

[0008] Optionally, along a third direction, a first limiting part is formed on the groove wall surface of one side of the first card slot and / or the second card slot, and a second limiting part is formed on the plug-in, wherein the first limiting part is connected to the second limiting part; And / or, along the third direction, the opposite sides of the connector respectively abut against the groove wall surfaces of the opposite sides of the first slot and / or the second slot; Wherein, the third direction is set at an angle to the first direction, and the third direction is set at an angle to the second direction.

[0009] Optionally, along the second direction, the second cover plate of the housing has a first end face away from the bottom surface of the first slot. The host has a second end face, and the first card slot is located on the second end face, wherein the first end face is flush with the second end face, or the first end face is located within the first card slot; and / or The expansion module has a third end face, and the second slot is located on the third end face. The first end face is flush with the third end face, or the first end face is located in the second slot.

[0010] Optionally, the host has a fourth end face and a fifth end face located on opposite sides in a third direction, and the fourth end face and / or the fifth end face are connected to a third limiting part on the side closer to the expansion module; The expansion module has a sixth end face and a seventh end face located on opposite sides of the third direction. The sixth end face and / or the seventh end face are rotatably connected to a fourth limiting part on the side closer to the host. The fourth limiting part is configured to connect with the third limiting part. Wherein, the third direction is set at an angle to the first direction, and the third direction is set at an angle to the second direction.

[0011] Optionally, the third limiting portion includes a second limiting protrusion, and the fourth limiting portion includes a rotating portion and a second limiting hole provided on the rotating portion, wherein the second limiting protrusion is configured to engage with the second limiting hole; or The third limiting part includes a third limiting hole, and the fourth limiting part includes a rotating part and a third limiting protrusion disposed on the rotating part. The third limiting protrusion is configured to engage with the third limiting hole.

[0012] Optionally, the sixth end face and / or the seventh end face are further provided with a fifth limiting part on the side away from the host. The expansion module is configured as at least two and is connected sequentially along the first direction. Each pair of adjacent expansion modules is detachably connected and electrically connected through the plug-in. For two adjacent expansion modules, the fourth limiting part of one expansion module is connected to the fifth limiting part of the other expansion module.

[0013] Optionally, the sixth end face and / or the seventh end face are provided with a rotating seat on the side near the host, and the fourth limiting part is rotatably connected to the rotating seat; And / or, the fourth limiting part has a first position and a second position, in the first position, the fourth limiting part of one of the expansion modules is connected to the fifth limiting part of the same expansion module, and in the second position, the fourth limiting part of one of the expansion modules is connected to the third limiting part, or to the fifth limiting part of another expansion module.

[0014] In the connectors and measuring instruments of this application, the connectors enable detachable and electrical connections between the main unit and expansion modules, or between two adjacent expansion modules, simplifying the assembly process and improving assembly efficiency. Specifically, the connectors achieve detachable connections between the main unit and expansion modules, or between two adjacent expansion modules, through a housing, and achieve electrical connections through electrical connectors. An internal mounting cavity within the housing accommodates the electrical connectors, ensuring that the electrical connectors are at least partially housed within the housing. The first and second connecting portions of the electrical connectors can be used to connect the main unit or expansion modules, forming an electrical connection between the main unit and expansion modules, or between two adjacent expansion modules.

[0015] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0017] Figure 1 This is a schematic diagram of the structure of the measuring instrument after it is assembled on the guide rail according to an exemplary embodiment of this application; Figure 2 This is a schematic diagram of the host structure provided in an exemplary embodiment of this application; Figure 3 This is a schematic diagram of the structure of the extension module provided in an exemplary embodiment of this application; Figure 4 This is a schematic diagram of the structure of the connector provided in an exemplary embodiment of this application; Figure 5 This is an exploded view of the connector provided in an exemplary embodiment of this application; Figure 6 This is a cross-sectional view of the host and expansion module connected in an exemplary embodiment of this application; Figure 7 This is a partial structural diagram of the host and expansion module after connection provided in an exemplary embodiment of this application; Figure 8 This is a partial structural diagram of the extension module provided in an exemplary embodiment of this application; Figure 9 This is a schematic diagram of a structure provided in an exemplary embodiment of this application, showing the disassembly of a connector using a disassembly tool.

[0018] Explanation of reference numerals in the attached figures: 1. Main unit; 11. First card slot; 111. First card receiving section; 112. Second card receiving section; 12. First limiting part; 13. First connector; 14. First insertion position; 15. Second end face; 17. Fourth end face; 18. Fifth end face; 19. Third limiting part; 191. Connecting section; 1911. First connecting sub-section; 1912. Second connecting sub-section; 192. Stop section; 1921. First stop sub-section; 1922. Second stop sub-section; 2. Expansion module; 21. Second slot; 211. Third connector section; 212. Fourth connector section; 22. Second connector; 23. Second insertion position; 24. Third end face; 25. Sixth end face; 26. Seventh end face; 27. Fourth limiting part; 271. Rotating part; 272. Second limiting hole; 28. Fifth limiting part; 29. ​​Rotating seat; 291. Rib; 3. Connector; 31. Second limiting part; 32. Housing; 321. First cover plate; 3211. Main body; 3212. First connector; 3213. Second connector; 322. Second cover plate; 3221. First end face; 323. Mounting groove; 324. First limiting rib; 325. Second limiting rib; 33. Electrical connector; 331. First connecting part; 332. Second connecting part; 34. Disassembly connector; 341. Disassembly groove; 4. Disassembly tools; 6. Guide rail. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0020] According to the first aspect of this application, referring to Figures 1 to 9 This application provides a connector 3. The connector 3 is configured to connect to a host 1 and / or an expansion module 2, enabling a detachable and electrical connection between the host 1 and the expansion module 2, or enabling a detachable and electrical connection between two adjacent expansion modules 2. The connector 3 includes a housing 32 and an electrical connector 33. A mounting cavity is formed inside the housing 32. The electrical connector 33 is disposed within the mounting cavity. The electrical connector 33 has a first connecting portion 331 and a second connecting portion 332 located outside the housing 32.

[0021] In this embodiment, the detachable connection and electrical connection between the host 1 and the expansion module 2, or between two adjacent expansion modules 2, are achieved through the connector 3. This simplifies the assembly process of the meter and improves its assembly efficiency. Specifically, the connector 3 achieves the detachable connection between the host 1 and the expansion module 2, or between two adjacent expansion modules 2, through the housing 32, and the electrical connection between the host 1 and the expansion module 2, or between two adjacent expansion modules 2, through the electrical connector 33. The mounting cavity inside the housing 32 accommodates the electrical connector 33, so that the electrical connector 33 is at least partially built into the housing 32. The first connecting portion 331 and the second connecting portion 332 of the electrical connector 33 can be used to connect the host 1 or the expansion module 2, thereby forming an electrical connection between the host 1 and the expansion module 2, or between two adjacent expansion modules 2.

[0022] In some embodiments, the electrical connector 33 is configured in a U-shape, and the mounting cavity is adapted to the shape of the electrical connector 33. When the electrical connector 33 is installed in the mounting cavity, both ends of the electrical connector 33 protrude from the mounting cavity, thereby forming a first connection portion 331 and a second connection portion 332. For example, the electrical connector 33 is a U-shaped pin, and both the first electrical connector and the second electrical connector are circuit pin headers.

[0023] In some embodiments, at least two electrical connectors 33 are provided, with each adjacent pair of electrical connectors 33 spaced apart. Correspondingly, at least two mounting cavities are formed inside the housing 32, each for mounting one electrical connector 33. The number of electrical connectors 33 can be selected according to the number of circuits to be expanded. For example, when seven circuits need to be expanded, seven mounting cavities inside the housing 32 can be equipped with electrical connectors 33, and the mounting cavities where no electrical connectors 33 are required can be closed by injection molding.

[0024] like Figure 5 As shown, in some embodiments, the housing 32 includes a first cover plate 321 and a second cover plate 322. The first cover plate 321 is configured with a mounting groove 323. The second cover plate 322 is connected to the first cover plate 321 and closes the mounting groove 323 to form a mounting cavity.

[0025] It is understood that a mounting groove 323 is formed within the first cover plate 321. When the second cover plate 322 is connected to the first cover plate 321, the mounting groove 323 can be closed to form a mounting cavity, thereby reserving an area inside the housing 32 for mounting the electrical connector 33. Specifically, the first cover plate 321 is close to the bottom surface of the first slot 11 and / or the second slot 21, and the second cover plate 322 is close to the opening surface of the first slot 11 and / or the second slot 21.

[0026] In some embodiments, the first cover plate 321 and the second cover plate 322 are ultrasonically welded to ensure a reliable connection between them. Alternatively, the first cover plate 321 and the second cover plate 322 can also be connected by adhesive, bolts, or other methods to ensure a stable connection.

[0027] Please continue reading. Figure 5 In some embodiments, the first cover plate 321 includes a main body portion 3211, a first insertion portion 3212, and a second insertion portion 3213. The first insertion portion 3212 and the second insertion portion 3213 are located at opposite ends on the same side of the main body portion 3211. The bottom surface of the first slot 11 is provided with a first insertion position 14. The bottom surface of the second slot 21 is provided with a second insertion position 23. The first insertion portion 3212 is connected to the first insertion position 14. The second insertion portion 3213 is connected to the second insertion position 23.

[0028] Understandably, the main body 3211 is completely accommodated in the first slot 11 and the second slot 21. The first insertion part 3212 is connected to the first insertion position 14 on the bottom surface of the first slot 11 so that the first insertion part 3212 can be reliably fixed in the first slot 11. The second insertion part 3213 is connected to the second insertion position 23 on the bottom surface of the second slot 21 so that the second insertion part 3213 can be reliably fixed in the second slot 21.

[0029] It should be noted that a portion of the electrical connector 33 protrudes from the first insertion portion 3212 to form the first connecting portion 331, and a portion of the electrical connector 33 protrudes from the second insertion portion 3213 to form the second connecting portion 332. Therefore, when the first insertion portion 3212 is inserted into the host unit 1 from the first insertion position 14, the first connecting portion 331 can be inserted into the first connector 13 located inside the host unit 1, achieving an electrical connection between the electrical connector 33 and the first connector 13. The second connecting portion 332 can be inserted into the second connector 22 located inside the expansion module 2, achieving an electrical connection between the electrical connector 33 and the second connector 22.

[0030] The first plug-in portion 3212 and the second plug-in portion 3213 are provided in pairs. The number of the first plug-in portion 3212 and the second plug-in portion 3213 is the same as the number of electrical connectors 33.

[0031] The first insertion part 3212 and the second insertion part 3213 are integrally formed on the main body part 3211. For example, the main body part 3211, the first insertion part 3212 and the second insertion part 3213 are integrally injection molded.

[0032] like Figure 4 and Figure 5As shown, in some embodiments, a first groove segment is formed within the main body portion 3211. A second groove segment communicating with one end of the first groove segment is formed within the first insertion portion 3212. A third groove segment communicating with the other end of the first groove segment is formed within the second insertion portion 3213. The first groove segment, the second groove segment, and the third groove segment together define a mounting groove 323. A portion of the electrical connector 33 protrudes from the second groove segment and forms a first connecting portion 331. A portion of the electrical connector 33 protrudes from the third groove segment and forms a second connecting portion 332.

[0033] It is understood that the mounting groove 323 is defined by the first groove in the main body 3211, the second groove in the first plug-in portion 3212, and the third groove in the second plug-in portion 3213, so that part of the electrical connector 33 is located in the main body 3211, part is located in the first plug-in portion 3212 and passes through the first plug-in portion 3212, and part is located in the second plug-in portion 3213 and passes through the second plug-in portion 3213.

[0034] The first insertion position 14 is an opening structure formed on the bottom surface of the first slot 11. The first slot 11 is connected to the inside of the host 1 through the first insertion position 14. A second slot segment is formed in the first insertion part 3212. The first connecting part 331 is the part that extends out of the second slot segment. Thus, the first connecting part 331 can be inserted into the inside of the host 1 from the first insertion position 14, thereby being inserted into the first connector 13 located inside the host 1, realizing the electrical connection between the electrical connector 33 and the first connector 13.

[0035] The second insertion position 23 is an opening structure formed on the bottom surface of the second slot 21. The second slot 21 is connected to the inside of the expansion module 2 through the second insertion position 23. A third slot segment is formed in the second insertion part 3213. The second connecting part 332 is the part that extends out of the third slot segment. Thus, the second connecting part 332 can be inserted into the inside of the expansion module 2 from the second insertion position 23, thereby plugging into the second connector 22 located inside the expansion module 2, realizing the electrical connection between the electrical connector 33 and the second connector 22.

[0036] According to a second aspect of this application, a measuring instrument is provided. The measuring instrument includes a main unit 1, an expansion module 2, and a connector 3 as described in the foregoing embodiments. Along a first direction, the expansion module 2 abuts against the main unit 1. Along a second direction, a first slot 11 is formed on one side of the main unit 1, and a second slot 21 is provided on one side of the expansion module 2. A housing 32 is connected within the first slot 11 and the second slot 21, allowing for a detachable connection between the main unit 1 and the expansion module 2. A first connecting portion 331 is electrically connected to a first connector 13, and a second connecting portion 332 is electrically connected to a second connector 22, allowing for an electrical connection between the main unit 1 and the expansion module 2. The first direction and the second direction are arranged at an angle.

[0037] It is understandable that by inserting the connector 3 into the first slot 11 of the host 1 and the second slot 21 of the expansion module 2, the host 1 and the expansion module 2 can be detachably fixed and electrically connected. At the same time, the host 1 and the expansion module 2 can be limited in the first direction to prevent relative movement in the first direction after the host 1 and the expansion module 2 are assembled.

[0038] In some embodiments, the groove walls of the first slot 11 and / or the second slot 21 are provided with a first limiting portion 12. A second limiting portion 31 is provided on the connector 3. The first limiting portion 12 is connected to the second limiting portion 31. The second limiting portion 31 of the connector 3 cooperates with the first limiting portion 12 on the groove walls of the first slot 11 and / or the second slot 21. On the one hand, it can limit and fix the connector 3 to prevent it from falling out of the first slot 11 and the second slot 21 along the second direction. On the other hand, the connector 3 can also limit the main unit 1 and the expansion module 2 to a certain extent in the second direction, preventing relative movement between the main unit 1 and the expansion module 2 after assembly in the second direction. Thus, the connector 3 can be avoided from being exposed, thus preventing it from affecting the appearance and size of the measuring instrument, and allowing for multi-directional degree of freedom limiting of the main unit 1 and the expansion module 2.

[0039] Specifically, when the connector 3 is inserted into the first slot 11 and the second slot 21, the connector 3 engages with the first slot 11 and the second slot 21, thereby achieving a detachable connection and electrical connection between the host 1 and the expansion module 2. Based on the engagement of the connector 3 with the first slot 11 and the second slot 21, the connector 3 can also limit the freedom of the host 1 and the expansion module 2 in the first direction, preventing relative movement in the first direction after assembly. Since the connector 3 is connected to the first limiting part 12 on the wall of the first slot 11 and / or the second slot 21 through the second limiting part 31, the engagement of the first limiting part 12 and the second limiting part 31 can reliably fix the connector 3, preventing it from falling out of the first slot 11 and the second slot 21. Simultaneously, the engagement of the first limiting part 12 and the second limiting part 31 also prevents the connector 3 from moving in the second direction after assembly into the first slot 11 and the second slot 21. Since the main unit 1, expansion module 2, and connector 3 are connected as a single unit, connector 3 cannot move relative to each other in the second direction. Consequently, the main unit 1 and expansion module 2 also cannot move relative to each other in the second direction. This prevents the main unit 1 and expansion module 2 from moving relative to each other in the second direction after assembly.

[0040] The first slot 11 and the second slot 21 are connected to form a connector slot. The connector 3 is inserted into the connector slot to achieve a detachable connection between the host 1 and the expansion module 2. The connector 3 is also reused as an electrical connection structure between the host 1 and the expansion module 2 to achieve an electrical connection between them. Therefore, when the expansion circuit is connected to the expansion module 2, energy metering can also be performed through the host 1.

[0041] The host unit 1 is the meter host. After the expansion module 2 is electrically connected to the host unit 1, it can be used to connect an expansion circuit to meet the metering requirements of multiple circuits. In this embodiment, the meter is an electricity meter.

[0042] like Figures 1 to 3 As shown, in some embodiments, the groove wall of the first slot 11 is provided with a first limiting part 12, and the plug-in 3 is provided with a second limiting part 31 at a position corresponding to the first slot 11; when the plug-in 3 is inserted into the first slot 11 and the second slot 21, the first limiting part 12 is connected to the second limiting part 31.

[0043] In some embodiments, the groove wall of the second slot 21 is provided with a first limiting part 12, and the plug-in 3 is provided with a second limiting part 31 at a position corresponding to the second slot 21; when the plug-in 3 is inserted into the first slot 11 and the second slot 21, the first limiting part 12 is connected to the second limiting part 31.

[0044] In some embodiments, the groove walls of the first slot 11 and the second slot 21 are provided with a first limiting part 12, and the plug-in 3 is provided with two second limiting parts 31 at intervals; when the plug-in 3 is inserted into the first slot 11 and the second slot 21, the first limiting part 12 is connected to the corresponding second limiting part 31.

[0045] When the first limiting part 12 is provided on the groove wall surface of both the first groove 11 and the second groove 21, the first limiting part 12 is located on the groove wall surface of the first groove 11 and the second groove 21 on the same side, so that the two second limiting parts 31 are located on the same side of the connector 3.

[0046] In some embodiments, the first direction and the second direction are set at an acute angle; or, the first direction and the second direction are set at a right angle; or, the first direction and the second direction are set at an obtuse angle. For example, the first direction is the X-axis direction, and the second direction is the Y-axis direction.

[0047] like Figure 2 As shown, in some embodiments, a first limiting portion 12 is constructed on one side of the groove wall of the first slot 11 and / or the second slot 21 along a third direction. The third direction is angled relative to the first direction; the third direction is angled relative to the second direction.

[0048] It is understandable that if the first limiting part 12 is provided on the groove wall of the first slot 11 and / or the second slot 21 on one side of the third direction, then the second limiting part 31 only needs to be provided on one side of the plug-in 3. Thus, the plug-in 3 can be installed without mistake, and reliable limiting and fixing can be achieved through the cooperation of the first limiting part 12 and the second limiting part 31.

[0049] Since the first limiting part 12 is located on the groove wall of the first slot 11 and / or the second slot 21 in the third direction, the second limiting part 31 is also provided on one side of the connector 3 in the third direction. When the first limiting part 12 and the second limiting part 31 are connected in the third direction, the first limiting part 12 and the second limiting part 31 cannot move relative to each other in the first direction and the second direction. Thus, the first limiting part 12 and the second limiting part 31 are limited in the first direction and the second direction, thereby preventing the host 1, the expansion module 2 and the connector 3 from moving relative to each other in the third direction.

[0050] In some embodiments, the first direction is set at an acute angle to the third direction; or, the first direction is set at a right angle to the third direction; or, the first direction is set at an obtuse angle to the third direction. The second direction is set at an acute angle to the third direction; or, the second direction is set at a right angle to the third direction; or, the second direction is set at an obtuse angle to the third direction. For example, the first direction is the X-axis direction, the second direction is the Y-axis direction, and the third direction is the Z-axis direction.

[0051] In some embodiments, the first slot 11 and the second slot 21 are both provided with a first limiting part 12 on the slot wall surface near the top; the plug-in 3 is provided with a second limiting part 31 on its top.

[0052] like Figure 1 As shown, in some embodiments, along a third direction, the opposite sides of the connector 3 abut against the groove wall surfaces of the opposite sides of the first slot 11 and / or the second slot 21, respectively.

[0053] It is understandable that, along a third direction, the opposite sides of the connector 3 are respectively abutted against the groove walls of the opposite sides of the first slot 11 and / or the second slot 21. This ensures that the connector 3 cannot move relative to the first slot 11 and / or the second slot 21 along a third direction, so that after the host 1, the expansion module 2 and the connector 3 are connected as one unit, the host 1 and the expansion module 2 also cannot move relative to each other along a third direction.

[0054] In some embodiments, along the second direction, the opposite sides of the connector 3 abut against the groove wall of the first slot 11 and the groove wall of the second slot 21, respectively. This prevents the connector 3 from moving relative to each other in the second direction within the first slot 11 and / or the second slot 21, so that after the host 1, the expansion module 2 and the connector 3 are connected as one unit, the host 1 and the expansion module 2 are also unable to move relative to each other in the second direction.

[0055] In some embodiments, one of the first limiting portion 12 and the second limiting portion 31 includes a first limiting hole, and the other includes a first limiting protrusion. The first limiting protrusion engages with the first limiting hole.

[0056] It is understandable that the first limiting protrusion is engaged in the first limiting hole along the third direction, so that the connector 3 and the first slot 11 and / or the second slot 21 form a limiting fixation, thereby effectively limiting the connector 3.

[0057] In some embodiments, the first limiting part 12 is a first limiting hole and the second limiting part 31 is a first limiting protrusion. In this case, the first limiting protrusion is integrally formed on the connector 3.

[0058] In some embodiments, the first limiting part 12 is a first limiting protrusion and the second limiting part 31 is a first limiting hole. In this case, the first limiting protrusion is integrally formed on the groove wall surface of the first slot 11 and / or the second slot 21.

[0059] like Figure 2 and Figure 3 As shown, in some embodiments, the host 1 is provided with a first connector 13. The expansion module 2 is provided with a second connector 22.

[0060] It is understood that the housing 32 is inserted into the first slot 11 and the second slot 21 to form a connection between the main unit 1 and the expansion module 2, enabling their detachable and fixed connection. The main unit 1 and the expansion module 2 are electrically connected through the electrical connector 33. Specifically, after the first connecting part 331 is inserted into the first connector 13, the first connecting part 331 and the first connector 13 form an electrical connection; simultaneously, after the second connecting part 332 is inserted into the second connector 22, the second connecting part 332 and the second connector 22 form an electrical connection. The specific electrical connection path is: first electrical connector - first connecting part 331 - electrical connector 33 - second connecting part 332 - second electrical connector 33 - second electrical connector.

[0061] like Figure 2 and Figure 3As shown, in some embodiments, the first card slot 11 includes a first card contact segment 111 and a second card contact segment 112 that are interconnected. The second card contact segment 112 is located outside the first card contact segment 111, and the slot width of the second card contact segment 112 is greater than the slot width of the first card contact segment 111. The second card slot 21 includes a third card contact segment 211 and a fourth card contact segment 212 that are interconnected. The fourth card contact segment 212 is located outside the third card contact segment 211, and the slot width of the fourth card contact segment 212 is greater than the slot width of the third card contact segment 211. The second card contact segment 112 and the fourth card contact segment 212 are connected. The main body portion 3211 is located within the second card contact segment 112 and the fourth card contact segment 212. The first insertion portion 3212 is located within the first card contact segment 111. The second insertion portion 3213 is located within the third card contact segment 211.

[0062] It is understood that the first card slot 11 includes a second card receiving segment 112 with a wider slot width and a first card receiving segment 111 with a narrower slot width. Since the second card receiving segment 112 is located outside the first card receiving segment 111, a roughly T-shaped first card slot 11 can be formed. The second card slot 21 includes a fourth card receiving segment 212 with a wider slot width and a third card receiving segment 211 with a narrower slot width. Since the fourth card receiving segment 212 is located outside the third card receiving segment 211, a roughly T-shaped second card slot 21 can be formed. The first card slot 11 and the second card slot 21 are interconnected through the connection between the second card receiving segment 112 and the fourth card receiving segment 212. The main body 3211 is located within the second latching section 112 and the fourth latching section 212. The main body 3211 abuts against the groove walls of the second latching section 112 and the fourth latching section 212 on opposite sides in the third direction, and also abuts against the opposite sides of the second latching section 112 and the fourth latching section 212 on opposite sides in the second direction. The first insertion part 3212 is inserted into the first latching section 111, and the second insertion part 3213 is inserted into the third latching section 211. Thus, the insertion member 3 can form connections with multiple latching sections of the first latching slot 11 and the second latching slot 21, thereby ensuring that the insertion member 3 can be stably and reliably installed in the first latching slot 11 and the second latching slot 21 without relative movement within them.

[0063] The first card connector segment 111 and the second card connector segment 112 are connected along the second direction, and the third card connector segment 211 and the fourth card connector segment 212 are connected along the third direction. The second card connector segment 112 and the fourth card connector segment 212 are connected along the first direction.

[0064] like Figure 4 and Figure 6As shown, in some embodiments, the first cover plate 321 further includes a first limiting rib 324 and a second limiting rib 325. The first limiting rib 324 and the second limiting rib 325 are connected to the main body portion 3211 at intervals along a first direction. The first limiting rib 324 abuts against the groove wall surface of the first engaging section 111. The second limiting rib 325 abuts against the groove wall surface of the third engaging section 211.

[0065] It is understandable that, by having the first limiting rib 324 abut against the groove wall of the first locking segment 111 and the second limiting rib 325 abut against the groove wall of the third locking segment 211, when the connector 3 is spliced ​​to the host 1 and the expansion module 2, the connector 3 can limit the host 1 and the expansion module 2 in the first direction to prevent the host 1 and the expansion module 2 from moving relative to each other in the first direction.

[0066] The spacing between the first limiting rib 324 and the second limiting rib 325 is the same as the sum of the wall thickness of the first locking section 111 groove wall and the wall thickness of the third locking section 211 groove wall, so that the groove walls of the first locking section 111 and the third locking section 211 are located between the first limiting rib 324 and the second limiting rib 325.

[0067] The first limiting rib 324 and the second limiting rib 325 are connected at intervals along the first direction to the main body 3211. The first limiting rib 324 extends along the third direction, and the second limiting rib 325 also extends along the third direction.

[0068] The first limiting rib 324 and the second limiting rib 325 are both integrally formed on the main body 3211.

[0069] like Figures 2 to 5 As shown, in some embodiments, along the second direction, the second cover plate 322 has a first end face 3221 away from the bottom surface of the first slot 11. The host 1 has a second end face 15. The first slot 11 is located on the second end face 15. The first end face 3221 is flush with the second end face 15. Alternatively, the first end face 3221 is located within the first slot 11. And / or, the expansion module 2 has a third end face 24. The second slot 21 is located on the third end face 24. The first end face 3221 is flush with the third end face 24. Alternatively, the first end face 3221 is located within the second slot 21.

[0070] In some embodiments, the first end face 3221 of the second cover plate 322 is the exposed surface of the connector 3. When the connector 3 is inserted into the first slot 11 and the second slot 21, the first end face 3221 is flush with the second end face 15 of the main unit 1. This avoids the connector 3 protruding from the main unit 1 and affecting the appearance and size of the measuring instrument, and also makes the connector 3 difficult to disassemble by hand, ensuring the reliability of the electrical connection and mechanical fixation of the connector 3 to the main unit 1 and the expansion module 2. Alternatively, when the connector 3 is inserted into the first slot 11 and the second slot 21, the first end face 3221 is located inside the first slot 11. This also avoids the connector 3 protruding from the main unit 1 and affecting the appearance and size of the measuring instrument, and also makes the connector 3 difficult to disassemble by hand, ensuring the reliability of the electrical connection and mechanical fixation of the connector 3 to the main unit 1 and the expansion module 2.

[0071] When the connector 3 is inserted into the first slot 11 and the second slot 21, its first end face 3221 is flush with the third end face 24 of the expansion module 2. This prevents the connector 3 from protruding beyond the expansion module 2 and affecting the appearance and size of the measuring instrument, and also makes the connector 3 difficult to disassemble by hand, ensuring the reliability of the electrical connection and mechanical fixation of the connector 3 to the main unit 1 and the expansion module 2. Alternatively, when the connector 3 is inserted into the first slot 11 and the second slot 21, its first end face 3221 is located within the second slot 21. This also prevents the connector 3 from protruding beyond the expansion module 2 and affecting the appearance and size of the measuring instrument, and also makes the connector 3 difficult to disassemble by hand, ensuring the reliability of the electrical connection and mechanical fixation of the connector 3 to the main unit 1 and the expansion module 2.

[0072] It should be noted that the second end face 15 of the host 1 is flush with the third end face 24 of the expansion module 2.

[0073] like Figure 5 As shown, in some embodiments, a disassembly connector 34 is connected to the first end face 3221. A disassembly groove 341 is formed on the disassembly connector 34. The disassembly groove 341 is configured to connect a disassembly tool 4.

[0074] Understandably, since the first end face 3221 is flush with the second end face 15 of the host 1 and the third end face 24 of the expansion module 2, or the first end face 3221 is located within the first slot 11 and the second slot 21, the connector 3 is not easily disassembled by hand. By providing a disassembly connector 34 on the first end face 3221 and a disassembly groove 341 on the disassembly connector 34, and by connecting a disassembly tool 4 to the disassembly groove 341, the connector 3 can be pulled out of the first slot 11 and the second slot 21, thereby separating the connector 3 from the host 1 and the expansion module 2, and allowing the expansion module 2 to be disassembled from one side of the host 1.

[0075] Two disassembly joints 34 may be provided at intervals on the first end face 3221. Each disassembly joint 34 is constructed with a disassembly groove 341. The disassembly groove 341 may be a square groove.

[0076] In some embodiments, the disassembly tool 4 includes, but is not limited to, tools such as tweezers, flathead screwdrivers, etc.

[0077] like Figure 2 and Figure 3 As shown, in some embodiments, the host 1 has a fourth end face 17 and a fifth end face 18 located on opposite sides in a third direction. A third limiting portion 19 is connected to the fourth end face 17 and / or the fifth end face 18 on the side near the expansion module 2. The expansion module 2 has a sixth end face 25 and a seventh end face 26 located on opposite sides in a third direction. A fourth limiting portion 27 is rotatably connected to the sixth end face 25 and / or the seventh end face 26 on the side near the host 1. The fourth limiting portion 27 is configured to connect with the third limiting portion 19.

[0078] It is understood that a third limiting part 19 is provided on the fourth end face 17 and / or the fifth end face 18 of the main unit 1, and a fourth limiting part 27 is provided on the sixth end face 25 and / or the seventh end face 26 of the expansion module 2. When the expansion module 2 is in close contact with one side of the main unit 1, the fourth limiting part 27 is rotated to connect with the third limiting part 19. Thus, the cooperation of the fourth limiting part 27 and the third limiting part 19 allows the main unit 1 and the expansion module 2 to be connected, and the main unit 1 and the expansion module 2 can be limited in the first and second directions to prevent relative movement between the main unit 1 and the expansion module 2 in the first and second directions.

[0079] In some embodiments, the fourth end face 17 and the sixth end face 25 are located on the same side of the measuring instrument; the fifth end face 18 and the seventh end face 26 are located on the same side of the measuring instrument.

[0080] In some embodiments, the fourth end face 17 is connected to the third limiting part 19 on the side near the expansion module 2, and the sixth end face 25 is rotatably connected to the fourth limiting part 27 on the side near the host 1. When the expansion module 2 is pressed against one side of the host 1, the fourth limiting part 27 is rotated to connect with the third limiting part 19. Thus, the host 1 and the expansion module 2 can be connected through the cooperation of the fourth limiting part 27 and the third limiting part 19, and the host 1 and the expansion module 2 can be limited in the first and second directions to prevent relative movement between the host 1 and the expansion module 2 in the first and second directions.

[0081] In some embodiments, the fifth end face 18 is connected to a third limiting part 19 on the side near the expansion module 2, and the seventh end face 26 is rotatably connected to a fourth limiting part 27 on the side near the host 1. When the expansion module 2 is pressed against one side of the host 1, the fourth limiting part 27 is rotated to connect with the third limiting part 19. Thus, the host 1 and the expansion module 2 can be connected through the cooperation of the fourth limiting part 27 and the third limiting part 19, and the host 1 and the expansion module 2 can be limited in the first and second directions to prevent relative movement between the host 1 and the expansion module 2 in the first and second directions.

[0082] In some embodiments, the fourth end face 17 and the fifth end face 18 are each connected to a third limiting part 19 on the side near the expansion module 2, and the sixth end face 25 and the seventh end face 26 are each rotatably connected to a fourth limiting part 27 on the side near the host 1.

[0083] like Figure 7 and Figure 8 As shown, in some embodiments, the third limiting portion 19 includes a second limiting protrusion. The fourth limiting portion 27 includes a rotating portion 271 and a second limiting hole 272 provided on the rotating portion 271. The second limiting protrusion is configured to engage within the second limiting hole 272. Alternatively, the third limiting portion 19 includes a third limiting hole. The fourth limiting portion 27 includes a rotating portion 271 and a third limiting protrusion provided on the rotating portion 271. The third limiting protrusion is configured to engage within the third limiting hole.

[0084] Understandably, when the expansion module 2 is pressed against one side of the main unit 1, the rotating part 271 is rotated towards the direction of the second limiting protrusion, causing the second limiting protrusion to engage with the second limiting hole 272. Thus, the cooperation of the second limiting protrusion and the second limiting hole 272 connects the main unit 1 and the expansion module 2, and limits the movement of the main unit 1 and the expansion module 2 in the first and second directions, preventing relative movement in those directions. Alternatively, when the expansion module 2 is pressed against one side of the main unit 1, the rotating part 271 is rotated towards the direction of the third limiting hole, causing the third limiting protrusion to engage with the third limiting hole. Thus, the cooperation of the third limiting protrusion and the third limiting hole connects the main unit 1 and the expansion module 2, and limits the movement of the main unit 1 and the expansion module 2 in the first and second directions, preventing relative movement in those directions.

[0085] like Figure 7As shown, in some embodiments, the second limiting protrusion includes a connecting section 191 and a stop section 192. The connecting section 191 is connected to the main unit 1. The stop section 192 is connected to the end of the connecting section 191 away from the main unit 1. The size of the stop section 192 is larger than the size of the second limiting hole 272. The connecting section 191 is configured to engage within the second limiting hole 272. The stop section 192 is configured to abut against the side of the rotating part 271 away from the main unit 1.

[0086] Understandably, the connecting segment 191 is used to connect with the second limiting hole 272, and the stop end is used to abut against the rotating part 271 to prevent the rotating part 271 from falling off the connecting segment 191. The size of the connecting segment 191 is less than or equal to the diameter of the second limiting hole 272, so that the connecting segment 191 can pass through the second limiting hole 272. The stop segment 192 can deform to reduce its size. Therefore, when the second limiting hole 272 passes through the stop segment 192, the stop segment 192 deforms to reduce its size, ensuring that the second limiting hole 272 can pass through the stop segment 192. When the second limiting hole 272 passes through the stop section 192, the stop section 192 returns to its original shape, thereby abutting the rotating part 271 on the side away from the main unit 1 to stop and limit the rotation of the rotating part 271, ensuring a reliable connection between the third limiting part 19 and the fourth limiting part 27, thereby ensuring a reliable connection between the main unit 1 and the expansion module 2.

[0087] In some embodiments, the second limiting hole 272 is a circular hole, the connecting section 191 is a cylindrical section, and the stop section 192 is a hemispherical section. In this case, the size of the second limiting hole 272 refers to the diameter of the second limiting hole 272, and the size of the stop section 192 refers to the diameter of the stop section 192.

[0088] like Figure 2 As shown, in some embodiments, the connecting segment 191 includes a first connecting sub-segment 1911 and a second connecting sub-segment 1912. The stop segment 192 includes a first stop sub-segment 1921 and a second stop sub-segment 1922. The first connecting sub-segment 1911 and the second connecting sub-segment 1912 are spaced apart from each other on the host 1. The first stop sub-segment 1921 is connected to the first connecting sub-segment 1911. The second stop sub-segment 1922 is connected to the second connecting sub-segment 1912.

[0089] Understandably, the first connecting segment 1911 and the second connecting segment 1912 are spaced apart on the fourth end face 17 and / or the fifth end face 18 of the main unit 1. The first stop segment 1921 is connected to the first connecting segment 1911, and the second stop segment 1922 is connected to the second connecting segment 1912. When the rotating part 271 rotates towards the connecting segment 191, the second limiting hole 272 first partially engages with the first stop segment 1921 and the second stop segment 1922. As the second limiting hole 272 continues to engage, the first stop segment 1921 and the second stop segment 1922 move closer to each other, thereby reducing the size of the stop segment 192 to ensure that the second limiting hole 272 can pass through the stop segment 192. During this process, the first connecting segment 1911 and the second connecting segment 1912 also move closer to each other. As the second limiting hole 272 passes through the first stop segment 1921 and the second stop segment 1922, the second limiting hole 272 can be fitted into the area where the first connecting segment 1911 and the second connecting segment 1912 are located. Since the diameter of the connecting segment 191 is less than or equal to the diameter of the second limiting hole 272, the first connecting segment 1911 and the second connecting segment 1912 can recover their deformation, that is, the first connecting segment 1911 and the second connecting segment 1912 move away from each other. During this process, the first stop segment 1921 and the second stop segment 1922 also move away from each other, so that the diameter of the stop segment 192 is greater than the diameter of the second limiting hole 272, and the stop segment 192 abuts against the side of the rotating part 271 away from the main unit 1. At this time, the stop segment 192 can play a limiting and stopping role to prevent the rotating part 271 from falling off the connecting segment 191.

[0090] In some embodiments, the first connecting segment 1911 and the first stop segment 1921 are integrally formed on the fourth end face 17 and / or the fifth end face 18 of the host 1. The second connecting segment 1912 and the second stop segment 1922 are integrally formed on the fourth end face 17 and / or the fifth end face 18 of the host 1.

[0091] like Figure 3 As shown, in some embodiments, the sixth end face 25 and / or the seventh end face 26 are further provided with a fifth limiting portion 28 on the side away from the host 1. At least two expansion modules 2 are configured and connected sequentially along the first direction. For two adjacent expansion modules 2, the fourth limiting portion 27 of one expansion module 2 is connected to the fifth limiting portion 28 of the other expansion module 2.

[0092] It is understandable that when at least two expansion modules 2 are provided, the at least two expansion modules 2 are connected sequentially along the first direction to connect more expansion loops through the at least two expansion modules 2. For adjacent expansion modules 2, the fourth limiting part 27 of one expansion module 2 is connected to the fifth limiting part 28 of the other expansion module 2, thereby achieving a detachable connection between the adjacent expansion modules 2. Furthermore, through the cooperation of the fourth limiting part 27 and the fifth limiting part 28, the connection between the adjacent expansion modules 2 can be limited in both the first and second directions to prevent relative movement between the adjacent expansion modules 2 in both directions.

[0093] In some embodiments, the sixth end face 25 is rotatably connected to the fourth limiting part 27 on the side closer to the host 1, and a fifth limiting part 28 is provided on the side away from the host 1.

[0094] In some embodiments, the seventh end face 26 is rotatably connected to the fourth limiting part 27 on the side closer to the host 1, and a fifth limiting part 28 is provided on the side away from the host 1.

[0095] It should be noted that the structure of the fifth limiting part 28 is the same as the structure of the second limiting protrusion.

[0096] In some embodiments, a rotating seat 29 is provided on the sixth end face 25 and / or the seventh end face 26 on the side near the main unit 1. The fourth limiting part 27 is rotatably connected to the rotating seat 29.

[0097] It is understood that the rotational connection between the fourth limiting part 27 and the sixth end face 25 and / or the seventh end face 26 is achieved by rotating the fourth limiting part 27 to the rotating seat 29.

[0098] In some embodiments, the fourth limiting portion 27 has a first position and a second position. In the first position, the fourth limiting portion 27 of one expansion module 2 is connected to the fifth limiting portion 28 of the same expansion module 2. In the second position, the fourth limiting portion 27 of one expansion module 2 is connected to the third limiting portion 19, or to the fifth limiting portion 28 of another expansion module 2.

[0099] It is understandable that when the fourth limiting part 27 is in the first position, the fourth limiting part 27 of one expansion module 2 is connected to the fifth limiting part 28 of the same expansion module 2, that is, the expansion module 2 is not assembled to the host 1 or other expansion modules 2, and the expansion module 2 is in a state of pending assembly. When the fourth limiting part 27 is in the second position, the fourth limiting part 27 of one expansion module 2 is connected to the third limiting part 19, that is, the expansion module 2 is assembled to one side of the host 1, and the expansion module 2 is in a state of being assembled to the host 1. When the fourth limiting part 27 is in the second position, the fourth limiting part 27 of one expansion module 2 is connected to the fifth limiting part 28 of another expansion module 2, that is, the expansion module 2 is assembled to one side of another expansion module 2, and the expansion module 2 is in a state of being assembled to another expansion module 2.

[0100] The fourth limiting part 27 switches between the first position and the second position by rotating itself.

[0101] like Figure 7 and Figure 8 As shown, in some embodiments, the rotating seat 29 is provided with a rib 291. In the first position, the fourth limiting portion 27 abuts against the rib 291 to support the fourth limiting portion 27.

[0102] It is understandable that by using the rib 291 to support the fourth limiting part 27, and cooperating with the connection between the fourth limiting part 27 and the fifth limiting part 28 of the expansion module 2, the fourth limiting part 27 is locked in the first position. When the expansion module 2 is not spliced ​​to the host 1 or another expansion module 2, the position of the fourth limiting part 27 can be reliably locked to prevent the fourth limiting part 27 from rotating at will.

[0103] In some embodiments, each rotating seat 29 includes two spaced-apart seats. One seat has a rib 291 on the side facing the other seat; or, both seats have ribs 291 on the side facing each other. Thus, when the fourth limiting part 27 is in the first position, the rib 291 can abut against the side surface of the fourth limiting part 27, thereby locking the position of the fourth limiting part 27.

[0104] The measuring device in this embodiment can be limited in the first, second, and third directions, satisfying multi-directional degree of freedom. Meanwhile, the connector 3, after being connected to the main unit 1 and the expansion module 2, does not affect the product's appearance or size, nor does it affect the wiring of the functional terminals. The connector 3's assembly and disassembly steps are simple and efficient; after assembly, each expansion module 2 can be disassembled individually, improving product repair and maintenance efficiency.

[0105] According to a third aspect of this application, a method for assembling a measuring instrument is provided, comprising: S1. Install the main unit 1 and the expansion module 2 onto the guide rail 6, and make the main unit 1 and the expansion module 2 fit together.

[0106] S2. Rotate the fourth limiting part 27 located on the expansion module 2 so that the fourth limiting part 27 of the expansion module 2 is engaged in the third limiting part 19 of the host 1.

[0107] S3. Insert the connector 3 into the first slot 11 of the host 1 and the second slot 21 of the expansion module 2, and make the host 1 and the expansion module 2 detachably connected and electrically connected.

[0108] When multiple expansion modules 2 are configured, the multiple expansion modules 2 are installed sequentially on the same side of the host 1, and the multiple expansion modules 2 are close to each other.

[0109] When multiple expansion modules 2 are spliced ​​together, rotate the fourth limiting part 27 of one expansion module 2 to connect it with the fifth limiting part 28 of another expansion module 2. Insert the connector 3 into the two second slots 21 of the two expansion modules 2, and connect the first limiting part 12 and the second limiting part 31 to complete the assembly of two adjacent expansion modules 2. Repeating this step can complete the splicing of multiple expansion modules 2.

[0110] The disassembly steps of the measuring instrument are the reverse of the assembly steps, and disassembly can be assisted by disassembly tool 4.

[0111] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0112] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0113] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0114] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A connector (3), characterized in that, The connector (3) is configured to connect to the host (1) and / or the expansion module (2), for detachably connecting and electrically connecting the host (1) and the expansion module (2), or for detachably connecting and electrically connecting two adjacent expansion modules (2); wherein the connector (3) includes: The housing (32) has an internal mounting cavity; An electrical connector (33) is disposed within the mounting cavity, the electrical connector (33) having a first connecting portion (331) and a second connecting portion (332) located outside the housing (32).

2. The connector (3) according to claim 1, characterized in that, The housing (32) includes: The first cover plate (321) has a mounting groove (323); A second cover plate (322) is connected to the first cover plate (321), and the second cover plate (322) closes the mounting groove (323) to form the mounting cavity; The first cover plate (321) includes a main body (3211), a first insertion part (3212), and a second insertion part (3213), wherein the first insertion part (3212) and the second insertion part (3213) are located at opposite ends on the same side of the main body (3211).

3. The connector (3) according to claim 2, characterized in that, A first groove is formed in the main body (3211), a second groove is formed in the first insertion part (3212) that communicates with one end of the first groove, and a third groove is formed in the second insertion part (3213) that communicates with the other end of the first groove. The first groove, the second groove, and the third groove together define the mounting groove (323). The electrical connector (33) extends through the second groove and forms the first connection portion (331), while the electrical connector (33) extends through the third groove and forms the second connection portion (332).

4. A measuring instrument, characterized in that, The device includes a host (1), an expansion module (2), and a connector (3) as described in any one of claims 1 to 3. Along a first direction, the expansion module (2) abuts against the host (1). Along a second direction, a first slot (11) is formed on one side of the host (1), and a second slot (21) is provided on one side of the expansion module (2). The housing (32) is connected in the first slot (11) and the second slot (21) to allow the host (1) and the expansion module (2) to be detachably connected. The first connecting part (331) is electrically connected to the first connector (13) of the host (1), and the second connecting part (332) is electrically connected to the second connector (22) of the expansion module (2) to allow the host (1) and the expansion module (2) to be electrically connected. The first direction and the second direction are set at an angle.

5. The measuring instrument according to claim 4, characterized in that, Along a third direction, a first limiting part (12) is constructed on the groove wall surface of one side of the first card slot (11) and / or the second card slot (21), and a second limiting part (31) is constructed on the plug (3), and the first limiting part (12) is connected to the second limiting part (31). And / or, along the third direction, the opposite sides of the connector (3) abut against the groove wall surfaces of the opposite sides of the first slot (11) and / or the second slot (21); Wherein, the third direction is set at an angle to the first direction, and the third direction is set at an angle to the second direction.

6. The measuring instrument according to claim 4, characterized in that, Along the second direction, the second cover plate (322) of the housing (32) has a first end face (3221) away from the bottom surface of the first slot (11); The host (1) has a second end face (15), and the first card slot (11) is located on the second end face (15), wherein the first end face (3221) is flush with the second end face (15), or the first end face (3221) is located within the first card slot (11); and / or The expansion module (2) has a third end face (24), and the second slot (21) is located on the third end face (24). The first end face (3221) is flush with the third end face (24), or the first end face (3221) is located in the second slot (21).

7. The measuring instrument according to claim 4, characterized in that, The host (1) has a fourth end face (17) and a fifth end face (18) located on opposite sides in the third direction, and the fourth end face (17) and / or the fifth end face (18) are connected to a third limiting part (19) on the side close to the expansion module (2). The expansion module (2) has a sixth end face (25) and a seventh end face (26) located on opposite sides of the third direction. The sixth end face (25) and / or the seventh end face (26) are rotatably connected to a fourth limiting part (27) on the side closer to the host (1). The fourth limiting part (27) is configured to be connected to the third limiting part (19). Wherein, the third direction is set at an angle to the first direction, and the third direction is set at an angle to the second direction.

8. The measuring instrument according to claim 7, characterized in that, The third limiting part (19) includes a second limiting protrusion, and the fourth limiting part (27) includes a rotating part (271) and a second limiting hole (272) provided on the rotating part (271), wherein the second limiting protrusion is configured to engage with the second limiting hole (272); or The third limiting part (19) includes a third limiting hole, and the fourth limiting part (27) includes a rotating part (271) and a third limiting protrusion provided on the rotating part (271). The third limiting protrusion is configured to engage with the third limiting hole.

9. The measuring instrument according to claim 8, characterized in that, The sixth end face (25) and / or the seventh end face (26) are further provided with a fifth limiting part (28) on the side away from the host (1). The expansion module (2) is configured to be at least two and connected sequentially along the first direction. Each pair of adjacent expansion modules (2) is detachably connected and electrically connected through the plug (3). For two adjacent expansion modules (2), the fourth limiting part (27) of one expansion module (2) is connected to the fifth limiting part (28) of the other expansion module (2).

10. The measuring instrument according to claim 9, characterized in that, The sixth end face (25) and / or the seventh end face (26) are provided with a rotating seat (29) on the side near the host (1), and the fourth limiting part (27) is rotatably connected to the rotating seat (29); And / or, the fourth limiting part (27) has a first position and a second position, in the first position, the fourth limiting part (27) of one of the expansion modules (2) is connected to the fifth limiting part (28) of the same expansion module (2), and in the second position, the fourth limiting part (27) of one of the expansion modules (2) is connected to the third limiting part (19) or to the fifth limiting part (28) of another expansion module (2).

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