A wiring structure of a basket-type electric power meter

Abstract

The wiring structure of the basket-type electric power meter of the present invention comprises at least one or more wiring terminals and a mounting frame, wherein the wiring terminals comprise a housing and a conductor post installed in the housing and having at least one end extending out of the housing, wherein a plurality of elastic elements are installed between the conductor post and the inner wall of the housing, wherein the conductor post is configured to be movable relative to the housing along a direction perpendicular to the extension direction of the conductor post under the action of the elastic elements; the wiring terminals are detachably installed on the mounting frame at intervals along a direction perpendicular to the extension direction of the conductor post. The wiring structure of the basket-type electric power meter of the present invention has the advantages of simple structure, low impedance, simple assembly, high reliability, the conductor post can adaptively fit according to the posture of the copper sheet in the wiring hole of the electric power meter, and conveniently adjust the number of wiring terminals and the spacing between wiring terminals.

Description

Technical Field

[0001] The invention relates to the technical field of wiring, and in particular to a wiring structure of a basket-type electric power meter. Background Art

[0002] In the electric power meter industry, the basket-type meter wiring method is a common and efficient wiring technology, which is widely used in various types of electric power metering instruments. This wiring method not only simplifies the wiring process and improves the wiring efficiency, but also ensures the accuracy and stability of electric power metering. The basket-type meter wiring method is a wiring technology designed specifically for electric power metering instruments. Its core lies in the tight connection of the wire post and the meter wiring copper sheet through the design of the basket-type structure. During the wiring process, the operator only needs to accurately insert the wire post into the wiring hole, and use a specific mechanism to firmly press the wire post on the wiring copper sheet to achieve low-impedance contact.

[0003] like Figure 7 As shown, a basket-type electric power meter wiring structure of the prior art includes a mounting seat 2 and wiring terminals 1 evenly spacedly installed on the mounting seat, the wiring terminals 1 and the mounting seat 2 are connected by a guide rail-slider structure 25, the wiring terminals include a shell 11 and a wire post 12, the wire post is fixedly connected to the shell and both ends extend out of the shell, and spring sheets 14 are provided on the upper and lower sides of one end. During the wiring process, the mounting seat 2 is moved close to the electric power meter to be connected through horizontal power, and the end of the wire post 12 provided with the spring sheet is inserted into the wiring hole of the electric power meter, and the spring sheet 14 is fitted with the copper sheet in the wiring hole under the action of elastic force, thereby completing the contact with the electric power meter. Although such a structural design is convenient and quick to use, it still has some technical defects:

[0004] (1) In the wiring structure of the spring-type electric power meter, the wiring terminal 1 and the mounting seat 2 are connected only by the guide rail-slider structure 25, and the wiring terminal and the mounting seat cannot be locked and positioned. As a result, during the repeated plug-in process between the wiring structure of the spring-type electric power meter and the electric power meter, the wiring terminal slides relative to the mounting seat, causing the spacing between the wiring terminals to change, making it impossible to effectively plug in, thereby affecting the accuracy and stability of subsequent plug-in.

[0005] (2) The wire post of the terminal block in the wiring structure of the spring-type power meter is fixedly connected to the shell, and the height cannot be adjusted in the vertical direction according to the position of the copper sheet in the wiring port of the external power meter. When the position of the copper sheet in the wiring port of the power meter is not in the expected position due to manufacturing tolerance, installation error or other reasons, the wire post may not be able to accurately connect with the copper sheet, resulting in poor versatility.

[0006] (3) In the wiring structure of the spring-type power meter, the terminal is connected to the copper sheet in the wiring hole of the power meter through the spring sheet in the wire column. In order to maintain elasticity, the spring sheet is designed with a certain inclination, which reduces the effective contact area between the spring sheet and the copper sheet in the wiring hole. The spring sheet is thin, has a small cross-sectional area, and has a certain contact gap with the wire column, which further reduces the conduction area. These two factors together lead to an increase in the impedance of the conduction between the spring sheet and the copper sheet, especially when the current is large, the impedance is too large. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a basket-type power meter wiring structure with simple structure, low impedance, simple assembly, high reliability, and the ability of the wire post to adaptively fit according to the posture of the copper sheet in the wiring hole of the power meter and conveniently adjust the number of wiring terminals and the spacing between the wiring terminals.

[0008] In order to solve the above technical problems, the present invention provides a technical solution, a basket-type electric power meter wiring structure, comprising at least one or more wiring terminals and a mounting frame, wherein the wiring terminal comprises a housing and a wire post installed in the housing and having at least one end extending out of the housing, wherein a plurality of elastic elements are installed between the wire post and the inner wall of the housing, and the wire post is configured to be movable relative to the housing along a direction perpendicular to the extension direction of the wire post under the action of the elastic elements;

[0009] The connecting terminals are detachably mounted on the mounting frame at intervals along an extending direction perpendicular to the conducting rods.

[0010] In a preferred embodiment, the shell is provided with a cavity penetrating front to back, the wire post is installed in the cavity, and two ends thereof extend out of the shell along the penetrating direction of the cavity respectively.

[0011] In a preferred embodiment, a contact is provided at one end of the wire column, and a first mounting hole is provided at the other end, and the material of the contact includes one or more of copper, silver or graphene.

[0012] In a preferred embodiment, a guiding slope is provided at one end of the contact away from the housing.

[0013] In a preferred embodiment, the shell is provided with a plurality of guide grooves which are connected with the cavity and arranged in parallel, the extension direction of the guide grooves is perpendicular to the penetration direction of the cavity, and the wire column is provided with a plurality of guide blocks which are adapted to the guide grooves.

[0014] In a preferred embodiment, the guide groove includes a first guide groove located above the wire post and a second guide groove coaxial with the first guide groove and located below the wire post.

[0015] In a preferred embodiment, the guide block includes a first guide block adapted to the first guide groove and a second guide block adapted to the second guide groove, the end face of the first guide block close to one end of the wire column is provided with a positioning portion extending outward, the wire column is provided with a positioning hole adapted to the positioning portion, and the positioning portion passes through the positioning hole and is fixedly connected to the second positioning block.

[0016] In a preferred embodiment, one end of the elastic element is fixedly connected to the wire post, and the other end is fixedly connected to the inner wall of the cavity along the extension direction of the guide groove, the elastic element includes a first elastic element and a second elastic element respectively located on both sides of the positioning hole, a second mounting hole for installing the first elastic element and the second elastic element is provided at the bottom of the wire post, and a third mounting hole for installing the first elastic element and the second elastic element is provided at a position corresponding to the second mounting hole in the cavity.

[0017] In a preferred embodiment, the mounting frame comprises a base, a top plate arranged parallel to the base, and a side plate for connecting the base and the top plate, the base and / or the top plate are provided with a plurality of slide grooves penetrating vertically, and the extending direction of the slide grooves is perpendicular to the extending direction of the wire posts in the wiring terminals;

[0018] The housing of the wiring terminal is provided with a sliding block matched with the sliding slot, and the wiring terminal is detachably mounted on the mounting frame at intervals along the extending direction of the sliding slot.

[0019] In a preferred embodiment, the top side wall of at least one of the slide grooves is recessed outward to form a step and a mounting groove, and a gasket and a screw adapted to the mounting groove are provided on the top of the corresponding sliding block on the terminal housing, and the terminal presses the gasket against the step through the screw to form a detachable connection with the mounting frame.

[0020] Compared with the prior art, the basket-type electric power meter wiring structure of the present invention has the following beneficial effects:

[0021] (1) The wiring structure of the basket-type electric power meter of the present invention comprises at least one or more wiring terminals and a mounting frame, wherein the wiring terminal comprises a housing and a wire post installed in the housing and having at least one end extending out of the housing, wherein a plurality of elastic elements are installed between the wire post and the inner wall of the housing, wherein the wire post is configured to be movable relative to the housing along a direction perpendicular to the extension direction of the wire post under the action of the elastic elements, and the wiring terminals are detachably installed on the mounting frame along a direction perpendicular to the extension direction of the wire post. With such a structural design, on the one hand, the wire post can be moved along a direction perpendicular to the extension direction of the wire post under the action of the elastic elements, thereby ensuring that the wire post can be adjusted in height in a vertical direction according to the wiring position of different types of electric power meters, and can be accurately inserted into the wiring hole of the electric power meter, thereby improving the wiring efficiency and versatility of the wiring terminal; on the other hand, the wire post can be adaptively fitted according to the posture of the copper sheet in the wiring port of the electric power meter under the action of the elastic elements, thereby making the wire post in direct contact with the copper sheet, thereby increasing the effective contact area and conduction area between the wire post and the copper sheet, reducing the impedance, reducing the energy loss during the electric power transmission process, and improving the accuracy of electric power metering.

[0022] (2) A contact is provided at one end of the wire post in the wiring structure of the basket-type electric power meter of the present invention, and the material of the contact includes one or more of copper, silver or graphene. Through the design of the contact structure, on the one hand, the wire post can better fit the copper sheet in the wiring port of the electric power meter, and on the other hand, by providing a contact made of low-impedance material, the contact impedance between the wire post and the copper sheet is further reduced, meeting the requirement of large current passing, reducing energy loss during power transmission, and improving the accuracy of power metering.

[0023] (3) The elastic element in the basket-type electric power meter structure of the present invention includes a first elastic element and a second elastic element respectively located on both sides of the positioning hole, a second mounting hole for mounting the first elastic element and the second elastic element is provided at the bottom of the conductor post, and a third mounting hole for mounting the first elastic element and the second elastic element is provided at a position corresponding to the second mounting hole. The double elastic element design located on both sides of the positioning hole, on the one hand, effectively prevents the displacement of the conductor post under the action of a single-sided elastic force, thereby avoiding the common problem of getting stuck. At the same time, during the insertion and removal of the terminal, this design can more evenly disperse the extrusion force, reduce the force burden of a single elastic element, and reduce the risk of deformation or failure of the elastic element due to repeated extrusion, thereby improving the service life and reliability of the terminal; on the other hand, the synergistic effect of the double spring elements further enhances the fit between the conductor post and the copper sheet in the wiring port of the electric power meter. This tight fit not only ensures the stable transmission of current, but also meets the requirements of large current passing, providing a strong guarantee for the accuracy of electric power metering.

[0024] (4) The wiring structure of the basket-type electric power meter of the present invention comprises a mounting frame including a base, a top plate arranged parallel to the base, and a side plate for connecting the base and the top plate. The base and / or the bottom plate are provided with a plurality of slide grooves extending vertically, and the extension direction of the slide grooves is perpendicular to the extension direction of the wire posts in the wiring terminals; the housing of the wiring terminals is provided with sliders adapted to the slide grooves, and the wiring terminals are detachably mounted on the mounting frame at intervals along the extension direction of the slide grooves. With such a structural design, on the one hand, the wiring terminals are easy to assemble, and on the other hand, under the action of the sliders and the slide grooves, the number and intervals of the wiring terminals can be conveniently adjusted according to the wiring ports of different types of electric power meters, so that the wiring structure of the basket-type electric power meter is applicable to more types of electric power meters, thereby improving its versatility and flexibility.

[0025] (5) In the wiring structure of the basket-type electric power meter of the present invention, the top side wall of at least one slide groove is recessed outward to form a step and a mounting groove, and the top of the corresponding slider on the terminal housing is provided with a gasket and a screw adapted to the mounting groove, and the terminal uses the screw to press the gasket against the step to form a detachable connection with the mounting frame. The use of such a locking structure design ensures that the terminal and the mounting seat are locked and positioned, avoiding the problem of the terminal sliding relative to the mounting seat during repeated plug-in, resulting in a change in the spacing between the terminals, thereby improving the accuracy, stability and reliability of plug-in. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a wiring structure of a basket-type electric power meter of the present invention;

[0027] Figure 2 A schematic diagram of a wiring terminal structure of a basket-type electric power meter wiring structure embodiment of the present invention;

[0028] Figure 3 It is a structural schematic diagram of a connection terminal of a basket-type electric power meter connection structure embodiment of the present invention from another angle;

[0029] Figure 4 A schematic diagram of the guide block structure of an embodiment of a basket-type electric power meter wiring structure of the present invention;

[0030] Figure 5 It is a schematic diagram of the wire column structure of an embodiment of a basket-type electric power meter wiring structure of the present invention;

[0031] Figure 6 A cross-sectional view of the installation structure of a basket-type electric power meter wiring structure embodiment of the present invention;

[0032] Figure 7 The present invention is a schematic diagram of the wiring structure of a shrapnel-type electric power meter in the prior art.

[0033] Description of reference numerals:

[0034] 1-terminal; 11-housing; 111-cavity; 1111-third mounting hole; 112-guide groove; 1121-first guide groove; 1122-second guide groove; 113-slider; 114-gasket; 115-screw; 116-first housing; 117-second housing; 118-positioning block; 119-positioning groove; 1110-groove; 12-conductor post; 121-contact; 1211-guide slope; 122-first mounting hole; 123-guide block; 1231-first guide block; 12311-positioning portion; 1232-second guide block; 124-positioning hole; 125-second mounting hole; 13-elastic element; 131-first elastic element; 132-second elastic element; 14-spring sheet;

[0035] 2-mounting frame; 21-base; 22-top plate; 23-side plate; 24-slide groove; 241-step; 242-mounting groove; 25-guide rail-slider structure; 26-positioning rod. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, an integral connection, or a detachable connection; it can be the internal connection of two components; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The wiring structure of the basket-type electric power meter in this embodiment is as follows: Figure 1-Figure 2The invention comprises at least one or more wiring terminals 1 and a mounting frame 2. The wiring terminal 1 comprises a housing 11 and a wire post 12 installed in the housing and having at least one end extending out of the housing. A plurality of elastic elements 13 are installed between the wire post and the inner wall of the housing. The wire post is configured to move relative to the housing along a direction perpendicular to the extension direction of the wire post under the action of the elastic elements 13. The wiring terminal is detachably installed on the mounting frame 2 along the direction perpendicular to the extension direction of the wire post. On the one hand, under the action of the elastic elements, the wire post can move along a direction perpendicular to the extension direction of the wire post, ensuring that the wire post can be adjusted in height in a vertical direction at the wiring position of different types of power metering instruments, accurately inserted into the wiring hole of the power metering instrument, and improving the wiring efficiency and versatility of the wiring terminal; on the other hand, under the action of the elastic elements, the wire post is adaptively fitted according to the posture of the copper sheet in the wiring port of the power metering instrument, so that the wire post is in direct contact with the copper sheet, thereby increasing the effective contact area and conduction area between the wire post and the copper sheet, reducing the impedance, reducing the energy loss during power transmission, and improving the accuracy of power metering.

[0040] like Figure 2-Figure 3 As shown, the housing 11 is provided with a cavity 111 penetrating from front to back, and the lead post 12 is installed in the cavity, and both ends extend out of the housing 11 along the penetrating direction of the cavity.

[0041] The shell 11 in this embodiment includes a first shell 116 and a second shell 117. The first shell is provided with a plurality of positioning blocks 118, and the second shell 15 is provided with a plurality of positioning grooves 119 corresponding to the positioning blocks one by one. The first shell and the second shell are fastened together and fixed by screws to form a cavity 111 that passes through the front and back.

[0042] The housing 11 is provided with a plurality of guide grooves 112 connected to the cavity and arranged in parallel, the extension direction of the guide grooves is perpendicular to the penetration direction of the cavity 111, and the conductor post 12 is provided with a plurality of guide blocks 123 adapted to the guide grooves.

[0043] In this embodiment, the guide groove 112 includes a first guide groove 1121 located above the wire post and a second guide groove 1122 coaxial with the first guide groove and located below the wire post. The guide block 123 includes a first guide block 1231 adapted to the first guide groove and a second guide block 1232 adapted to the second guide groove, so that the wire post is more stable when inserted into the wiring hole of the power meter, and the looseness or deviation caused by external force is reduced. Figure 4 As shown, the end surface of the first guide block close to one end of the conductor post is provided with a positioning portion 12311 extending outward, and the conductor post 12 is provided with a positioning hole 124 adapted to the positioning portion, and the positioning portion passes through the positioning hole and is fixedly connected to the second positioning block.

[0044] One end of the elastic element 13 is fixedly connected to the wire post 12, and the other end is fixedly connected to the inner wall of the cavity 111 along the extension direction of the guide groove 112. In this embodiment, the elastic element 13 includes a first elastic element 131 and a second elastic element 132 respectively located on both sides of the positioning hole 124, and a second mounting hole 125 for mounting the first elastic element and the second elastic element is provided at the bottom of the wire post 12, and a third mounting hole 1111 for mounting the first elastic element and the second elastic element is provided at a position corresponding to the second mounting hole. The double elastic element design located on both sides of the positioning hole, on the one hand, effectively prevents the displacement of the wire post under the action of a unilateral elastic force, thereby avoiding the common problem of getting stuck. At the same time, during the insertion and removal of the terminal blocks, this design can more evenly disperse the extrusion force, reduce the force burden of a single elastic element, and reduce the risk of deformation or failure of the elastic element due to repeated extrusion, thereby improving the service life and reliability of the terminal blocks; on the other hand, the synergistic effect of the double spring elements further enhances the fit between the wire post and the copper sheet in the wiring port of the electric meter. This tight fit not only ensures the stable transmission of current, but also meets the requirements for large current passage, providing a strong guarantee for the accuracy of electric power metering.

[0045] In this embodiment, a double compression spring with a wire diameter of 0.8 mm is used to generate a compressive elastic force to make the conductor post contact and fit with the copper sheet in the wiring port of the electric power meter, and the fitting force meets the requirement for large current passing.

[0046] like Figure 5 As shown, a contact 121 is provided at one end of the wire column 12, and a first mounting hole 122 is provided at the other end for connecting an external device. The material of the contact includes one or more of copper, silver or graphene. In this embodiment, the material of the contact is silver, and the resistivity of silver is 1.62×10-8Ω·m, which improves the conductivity efficiency. Through the design of the contact structure, on the one hand, the wire column can better fit the copper sheet in the wiring port of the power meter. On the other hand, by setting the contact of low-impedance material, the contact impedance between the wire column and the copper sheet is further reduced, meeting the demand for large current passing, reducing energy loss during power transmission, and improving the accuracy of power metering.

[0047] In this embodiment, a guide slope 1211 is provided at one end of the contact away from the housing, which helps the contact to find the correct contact position more easily, reduces problems caused by improper installation or difficult debugging, and helps to improve the efficiency of installation and debugging and reduce maintenance costs.

[0048] like Figure 1As shown, the mounting frame 2 includes a base 21, a top plate 22 arranged parallel to the base, and a side plate 23 for connecting the base and the top plate. The base and / or the top plate are provided with a plurality of slide grooves 24 running through from top to bottom, and the extension direction of the slide groove is perpendicular to the extension direction of the wire column in the terminal block 1. The housing of the terminal block is provided with a slider 113 adapted to the slide groove, and the terminal block is detachably installed on the mounting frame at intervals along the extension direction of the slide groove. With such a structural design, on the one hand, the terminal block is easy to assemble, and on the other hand, under the action of the slider and the slide groove, the number and interval of the terminal blocks can be conveniently adjusted according to the wiring ports of different types of electric power meters, so that the wiring structure of the basket-type electric power meter is suitable for more types of electric power meters, thereby improving its versatility and flexibility.

[0049] In this embodiment, Figure 6 As shown, the base and the top plate are both provided with a plurality of slide grooves 24 that penetrate up and down. The top side wall of one slide groove 24 of the top plate is recessed outward to form a step 241 and a mounting groove 242. The top of the corresponding slider 113 on the terminal housing is provided with a gasket 114 and a screw 115 that match the mounting groove. The terminal 1 presses the gasket against the step through the screw to form a detachable connection with the mounting frame. The use of such a locking structure design ensures that the terminal and the mounting seat are locked and positioned, avoids the terminal sliding relative to the mounting seat during repeated plug-in, and causes the spacing between the terminals to change, thereby improving the accuracy, stability and reliability of plug-in.

[0050] In this embodiment, Figure 1 As shown, the mounting frame 2 is provided with a positioning rod 26 arranged parallel to the base, and the terminal housing 11 is provided with a groove 1110 adapted to the cross section of the positioning rod.

[0051] In short, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A basket-type power meter wiring structure, characterized in that: The invention comprises at least one or more wiring terminals (1) and a mounting frame (2), wherein the wiring terminal comprises a housing (11) and a conductor post (12) installed in the housing and having at least one end extending out of the housing, wherein a plurality of elastic elements (13) are installed between the conductor post and the inner wall of the housing, and under the action of the elastic elements, the conductor post is configured to be movable relative to the housing in a direction perpendicular to the extension direction of the conductor post; The housing (11) is provided with a cavity (111) penetrating from front to back, and has a plurality of guide grooves (112) communicating with the cavity and arranged in parallel, the extension direction of the guide grooves being arranged perpendicular to the penetration direction of the cavity, and the conductor post (12) is provided with a plurality of guide blocks (123) adapted to the guide grooves; The guide groove (112) comprises a first guide groove (1121) located above the conductor post and a second guide groove (1122) coaxial with the first guide groove and located below the conductor post; The guide block (123) comprises a first guide block (1231) adapted to the first guide groove and a second guide block (1232) adapted to the second guide groove, the end surface of the first guide block close to one end of the wire column is provided with a positioning portion (12311) extending outward, the wire column (12) is provided with a positioning hole (124) adapted to the positioning portion, and the positioning portion passes through the positioning hole and is fixedly connected to the second guide block; The connection terminals are detachably mounted on the mounting frame (2) at intervals along an extension direction perpendicular to the lead posts.

2. A basket-type electric power meter wiring structure according to claim 1, characterized in that: The conductor post (12) is installed in the cavity, and two ends thereof extend out of the housing along a penetrating direction of the cavity.

3. A basket-type electric power meter wiring structure according to claim 2, characterized in that: One end of the conductor post (12) is provided with a contact point (121), and the other end is provided with a first mounting hole (122); the material of the contact point includes one or more of copper, silver or graphene.

4. A basket-type electric power meter wiring structure according to claim 3, characterized in that: A guiding inclined surface (1211) is provided at one end of the contact away from the housing.

5. A basket-type electric power meter wiring structure according to claim 4, characterized in that: One end of the elastic element (13) is fixedly connected to the wire post (12), and the other end is fixedly connected to the inner wall of the cavity (111) along the extension direction of the guide groove (112); the elastic element (13) comprises a first elastic element (131) and a second elastic element (132) respectively located on both sides of the positioning hole (124); a second mounting hole (125) for mounting the first elastic element and the second elastic element is provided at the bottom of the wire post (12); and a third mounting hole (1111) for mounting the first elastic element and the second elastic element is provided at a position corresponding to the second mounting hole in the cavity (111).

6. A basket-type electric power meter wiring structure according to claim 5, characterized in that: The mounting frame comprises a base (21), a top plate (22) arranged parallel to the base, and a side plate (23) for connecting the base and the top plate, the base and / or the top plate being provided with a plurality of slide grooves (24) penetrating vertically, the extension direction of the slide grooves being arranged perpendicular to the extension direction of the wire posts in the wiring terminal; The housing of the connection terminal is provided with a sliding block (113) adapted to the sliding slot, and the connection terminal is detachably mounted on the mounting frame at intervals along the extension direction of the sliding slot.

7. A basket-type electric power meter wiring structure according to claim 6, characterized in that: The top side wall of at least one of the slide grooves (24) is recessed outward to form a step (241) and a mounting groove (242); a gasket (114) and a screw (115) adapted to the mounting groove are provided on the top of the corresponding slide block on the terminal housing; the terminal is connected to the step by pressing the gasket against the step via the screw, thereby forming a detachable connection with the mounting frame.

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