Combined multi-loop voltage and current monitoring terminal equipment and mounting bracket thereof

Abstract

The invention relates to the technical field of electric power, and discloses a combined type multi-loop voltage and current monitoring terminal device and a mounting bracket thereof, the combined type multi-loop voltage and current monitoring terminal device comprises a digital display ampere-voltage meter, and the surface of the digital display ampere-voltage meter is fixedly connected with uniformly distributed jack auxiliary mechanisms; a socket of the digital display ampere-voltage meter is arranged at the inner side of the socket auxiliary mechanism; according to the digital display ampere-voltage meter, the telescopic mounting structure is matched with the adapter, so that the interface of the digital display ampere-voltage meter and the external electric appliance element can be moved to a position where the digital display ampere-voltage meter and the external electric appliance element are convenient to assemble and disassemble; the digital display ampere-voltage meter can be easily taken out and installed by a worker on the premise of not disconnecting external electric appliance elements, so that the subsequent installation and maintenance difficulty of the worker is effectively reduced, and the problem that the existing combined multi-loop voltage and current monitoring terminal equipment is difficult to install and maintain is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power, and in particular relates to a combined multi-circuit voltage and current monitoring terminal device and a mounting bracket thereof. Background Art

[0002] Digital current and voltage meter is a current and voltage testing and monitoring instrument with digital display function. It is currently a common combined multi-circuit voltage and current monitoring terminal equipment. With the continuous development of digital technology and microcomputer technology, digital display meters and new display and recording instruments with single-chip microcomputer as the core are increasingly widely used in industrial automation and industrial control fields.

[0003] At present, a Chinese patent discloses a smart substation voltage and current monitoring device (authorization announcement number is CN221351596U). The user twists the sealing cover and removes the sealing cover from the surface of the movable block, then inserts the wire into the through hole, and pulls it out from the inner cavity of the sealing cover. Then the user presses the movable block through the groove to slide on the surface of the insulating sleeve. The movable block slides and cooperates with the voltage and current digital display to compress the spring. The movable block moves to one side so that the conductive block is separated from the movable block. Then the user winds the wire in the connecting groove. After the winding is completed, the user loosens the movable block and drives the movable block to reset through the elastic force of the spring. The movable block cooperates with the conductive block to fix the wire. At the same time, the user pulls the wire and twists the sealing cover back to the surface of the movable block, thereby achieving the purpose of facilitating the fixing of the cable.

[0004] Since the above-mentioned device sets the wire terminal on the back of the digital current and voltage meter, and the staff needs to rotate the movable block on the back of the digital current and voltage meter to lock the wire when fixing the wire, this not only affects the staff's rapid and stable installation of the digital current and voltage meter, but also increases the difficulty of fixing the wire, which is inconvenient for the staff to install and maintain. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the shortcomings of the prior art, the present invention provides a combined multi-circuit voltage and current monitoring terminal device and its mounting bracket, which have the advantages of easy installation and connection, good dustproof effect and over-temperature protection function, and solve the problems of the existing combined multi-circuit voltage and current monitoring terminal device that is difficult to install and connect, has poor dustproof effect and low safety factor.

[0007] (II) Technical solution

[0008] In order to achieve the above-mentioned purpose of easy installation and connection, good dustproof effect and over-temperature protection function, the present invention provides the following technical solutions:

[0009] A combined multi-circuit voltage and current monitoring terminal device comprises a digital current and voltage meter, the surface of which is fixedly connected with uniformly distributed socket auxiliary mechanisms, and the sockets of the digital current and voltage meter are arranged on the inner side of the socket auxiliary mechanisms.

[0010] Based on the above technical features: the socket auxiliary mechanism includes a mounting sleeve, the mounting sleeve is fixedly connected to the surface of the digital current and voltage meter, the socket of the digital current and voltage meter is arranged on the inner side of the mounting sleeve, one end of the mounting sleeve is fixedly connected to a plastic ring, the surface of the plastic ring is slidably connected to a protective sleeve, one end of the mounting sleeve is provided with a mounting cavity, the interior of the mounting cavity is slidably connected to a guide rod, one end of the guide rod passes through the mounting cavity and extends to the outside of the plastic ring, the guide rod is fixedly connected to the plastic ring, and a rubber spring that is always in a compressed state is arranged between the guide rod and the mounting cavity.

[0011] As a preferred solution of the combined multi-circuit voltage and current monitoring terminal device described in the present invention: when the temperature of the adapter reaches the melting point of the plastic ring, the plastic ring in contact with the adapter gradually melts and loses its fixation on the guide rod. At this time, the rubber spring quickly pushes the guide rod outward, and the guide rod drives the connecting ring to push the protective sleeve outward, and the protective sleeve drives the external electrical component connector to quickly separate from the adapter. This is to ensure safety, prevent fire risks and personal injury, and at the same time protect the digital current and voltage meter and external electrical components from further damage, extend their service life, limit the scope of failure, and reduce maintenance costs.

[0012] Based on the above technical features: an L-shaped ring groove is opened on the inner side of the protective sleeve, the top of the plastic ring is fixedly connected with a connecting ring in contact with the protective sleeve, one end of the connecting ring is fixedly connected with elastic silicone membrane petals distributed in a ring shape and in contact with the L-shaped ring groove, two adjacent elastic silicone membrane petals are in contact with each other, and all the elastic silicone membrane petals together form a round cover for the digital current and voltage meter socket.

[0013] As a preferred solution of the combined multi-circuit voltage and current monitoring terminal device described in the present invention: through the coordinated use of a protective sleeve and an elastic silicone membrane petal, when the adapter is not in use, the elastic silicone membrane petal is gathered by the protective sleeve to seal the opening of the protective sleeve, which can prevent external dust, water vapor and other impurities from entering the interior of the adapter, so that the interior of the adapter is always kept clean and dry to ensure that the adapter can be used normally. When the external electrical component plug needs to be connected to the adapter, the staff can easily remove the blockage of the elastic silicone membrane petal by moving the protective sleeve, and in the process of connecting the external electrical component plug to the adapter, the protective sleeve and the elastic silicone membrane petal respectively play the role of guidance and elastic positioning, which can reduce the probability of the electrical component plug being offset or loosened during installation and use.

[0014] Based on the above technical features: a limiting ring groove is provided on the inner side of the protective sleeve, and the plastic ring is slidably connected to the inside of the limiting ring groove.

[0015] As a preferred solution of the combined multi-circuit voltage and current monitoring terminal device described in the present invention: this can limit the moving trajectory of the protective sleeve and prevent the protective sleeve from completely separating from the plastic ring to achieve an anti-separation effect.

[0016] Based on the above technical features: a positioning groove is provided on the surface of the plastic ring, and a positioning block in contact with the limiting ring groove is clamped inside the positioning groove.

[0017] As a preferred solution of the combined multi-circuit voltage and current monitoring terminal device described in the present invention: this can firmly lock the reset protective cover in this position to improve the stability of the connection between the external electrical component connector and the adapter.

[0018] Based on the above technical features: the positioning block is a rubber material component, and the positioning groove and the positioning block are both in matching arc shapes.

[0019] As a preferred solution of the combined multi-circuit voltage and current monitoring terminal device described in the present invention: this can reduce the difficulty of disengaging the positioning block from the positioning groove, so that the staff can easily adjust the position of the protective cover.

[0020] Based on the above technical features: one end of the rubber spring is fixedly connected to a slip ring that is slidably connected to the installation cavity, and one end of the slip ring is fixedly connected to the guide rod; the number of the guide rods is not less than two, and the guide rod is fixedly connected to one end of the guide rod in a ring shape around the axis of the slip ring.

[0021] As a preferred solution of the combined multi-circuit voltage and current monitoring terminal device described in the present invention: this enables the protective cover to smoothly push the external electrical component plug out of the adapter to ensure the normal operation of the over-protection function.

[0022] A mounting bracket for a combined multi-loop voltage and current monitoring terminal device comprises an L-shaped mounting bracket, a sliding cavity is provided on the top of the L-shaped mounting bracket, a slide plate is slidably connected to the inside of the sliding cavity, a top plate is fixedly connected to the top of the slide plate, the digital current and voltage meter is arranged between the L-shaped mounting bracket and the top plate, the mounting sleeve is respectively fixedly connected to the opposite ends of the L-shaped mounting bracket and the top plate, the opposite ends of the L-shaped mounting bracket and the top plate are both threadedly connected with evenly distributed adapters, the male head of the adapter is electrically connected to the socket of the digital current and voltage meter, and the female head of the adapter passes through the inner side of the mounting sleeve.

[0023] As a preferred solution for the installation bracket of a combined multi-circuit voltage and current monitoring terminal device described in the present invention: by utilizing the telescopic installation structure in conjunction with the adapter, not only can the interface between the digital current and voltage meter and the external electrical component be moved to a position that is convenient for loading and unloading, but also when the staff needs to maintain the digital current and voltage meter, the staff can easily take out and install the digital current and voltage meter without disconnecting the external electrical component. This also effectively reduces the difficulty of subsequent installation and maintenance for the staff, so as to solve the problem of installation and maintenance difficulties in the existing combined multi-circuit voltage and current monitoring terminal device.

[0024] Based on the above technical features: a metal spring is arranged between the slide plate and the slide cavity, and the metal spring is always in a compressed state.

[0025] As a preferred solution for the mounting bracket of a combined multi-circuit voltage and current monitoring terminal device described in the present invention: the metal spring can always apply a downward thrust to the top plate through the slide plate, so that the top plate cooperates with the L-shaped mounting frame to lock the digital current and voltage meter more stably.

[0026] Based on the above technical features: an adjustment handle is fixedly connected to the top of the top plate, and the corners of the adjustment handle are rounded.

[0027] Based on the above technical features: this can reduce the difficulty for workers to pull up the top plate, so as to facilitate the workers to load and unload the digital display ammeter and voltmeter.

[0028] (III) Beneficial effects

[0029] Compared with the prior art, the present invention provides a combined multi-circuit voltage and current monitoring terminal device and a mounting bracket thereof, which has the following beneficial effects:

[0030] By using the telescopic installation structure and the adapter, not only can the interface between the digital current and voltage meter and the external electrical component be moved to a position that is convenient for loading and unloading, but also when the staff needs to maintain the digital current and voltage meter, the staff can easily take out and install the digital current and voltage meter without disconnecting the external electrical component, which effectively reduces the difficulty of subsequent installation and maintenance for the staff, so as to solve the problem of difficult installation and maintenance of the existing combined multi-circuit voltage and current monitoring terminal equipment;

[0031] Through the coordinated use of the protective sleeve and the elastic silicone membrane flap, when the adapter is not in use, the elastic silicone membrane flap is gathered by the protective sleeve to seal the opening of the protective sleeve, which can prevent external dust, water vapor and other impurities from entering the interior of the adapter, so that the interior of the adapter is always kept clean and dry to ensure that the adapter can be used normally. When the external electrical component plug needs to be connected to the adapter, the staff can easily remove the blockage of the elastic silicone membrane flap by moving the protective sleeve, and in the process of connecting the external electrical component plug to the adapter, the protective sleeve and the elastic silicone membrane flap respectively play the role of guidance and elastic positioning, which can reduce the probability of the electrical component plug being offset or loosened during installation and use;

[0032] When the temperature of the adapter reaches the melting point of the plastic ring, the plastic ring in contact with the adapter gradually melts and loses its fixation on the guide rod. At this time, the rubber spring quickly pushes the guide rod outward, and the guide rod drives the connecting ring to push the protective sleeve outward. The protective sleeve drives the external electrical component connector to quickly separate from the adapter. This is to ensure safety, prevent fire risks and personal injury, and at the same time protect the digital current and voltage meter and external electrical components from further damage, extend their service life, limit the scope of failure, and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the overall structure of the present invention;

[0034] Figure 2 It is a cross-sectional schematic diagram of the overall structure of the present invention;

[0035] Figure 3 It is a schematic diagram of the connection between the socket auxiliary mechanism and the adapter of the present invention;

[0036] Figure 4 It is a cross-sectional schematic diagram of the socket auxiliary mechanism and the adapter of the present invention;

[0037] Figure 5 It is an exploded schematic diagram of the socket auxiliary mechanism of the present invention;

[0038] Figure 6 It is a schematic diagram of a partial structure of the present invention;

[0039] Figure 7 It is a cross-sectional schematic diagram of a local cut structure of the present invention.

[0040] In the figure: 100, digital display current and voltage meter; 200, socket auxiliary mechanism; 210, installation sleeve; 211, installation cavity; 220, plastic ring; 221, positioning groove; 230, protective sleeve; 231, L-shaped ring groove; 232, limit ring groove; 240, guide rod; 250, rubber spring; 260, connecting ring; 270, elastic silicone membrane petal; 280, positioning block; 290, slip ring; 300, L-shaped mounting frame; 310, sliding cavity; 400, slide plate; 500, top plate; 600, adapter; 700, metal spring; 800, adjustment handle. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] See also Figure 1 - Figure 7 , the present invention provides a technical solution:

[0043] A combined multi-circuit voltage and current monitoring terminal device includes a digital current and voltage meter 100, the surface of which is fixedly connected with uniformly distributed socket auxiliary mechanisms 200, and the sockets of the digital current and voltage meter 100 are arranged on the inner side of the socket auxiliary mechanism 200.

[0044] like Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the socket auxiliary mechanism 200 includes a mounting sleeve 210, which is fixedly connected to the surface of the digital current and voltage meter 100, and the socket of the digital current and voltage meter 100 is arranged on the inner side of the mounting sleeve 210, and one end of the mounting sleeve 210 is fixedly connected to a plastic ring 220, and the surface of the plastic ring 220 is slidably connected to a protective sleeve 230, and one end of the mounting sleeve 210 is provided with a mounting cavity 211, and the interior of the mounting cavity 211 is slidably connected to a guide rod 240, and one end of the guide rod 240 passes through the mounting cavity 211 and extends to the outside of the plastic ring 220, and the guide rod 240 is fixedly connected to the plastic ring 220, and a rubber spring 250 that is always in a compressed state is arranged between the guide rod 240 and the mounting cavity 211, and the plastic ring 220 can be made of a low melting point plastic component, and the specific material and type need to be selected according to actual conditions, which will not be described here;

[0045] A limiting ring groove 232 is provided on the inner side of the protective sleeve 230, and the plastic ring 220 is slidably connected to the inside of the limiting ring groove 232, which can limit the movement trajectory of the protective sleeve 230 and prevent the protective sleeve 230 from being completely separated from the plastic ring 220, so as to achieve an anti-detachment effect; a positioning groove 221 is provided on the surface of the plastic ring 220, and a positioning block 280 in contact with the limiting ring groove 232 is clamped inside the positioning groove 221, which can firmly lock the reset protective sleeve 230 in this position, so as to improve the stability of the connection between the external electrical component connector and the adapter 600; the positioning block 280 is a rubber material component, and the positioning groove 221 and the positioning block 280 are all matched arc shapes, which can reduce the difficulty of separating the positioning block 280 from the positioning groove 221, so that the staff can easily adjust the position of the protective sleeve 230; one end of the rubber spring 250 is fixedly connected to a slip ring 290 that is slidably connected to the installation cavity 211, and one end of the slip ring 290 is fixedly connected to the guide rod 240. The number of the guide rods 240 is not less than two, and the guide rod 240 is annularly fixedly connected to one end of the guide rod 240 around the axis of the slip ring 290, which enables the protective sleeve 230 to smoothly push the external electrical component plug out of the adapter 600 to ensure the normal operation of the over-inquiry protection function;

[0046] When the temperature of the adapter 600 reaches the melting point of the plastic ring 220, the plastic ring 220 in contact with the adapter 600 gradually melts and loses its fixation on the guide rod 240. At this time, the rubber spring 250 quickly pushes the guide rod 240 outward, and the guide rod 240 drives the connecting ring 260 to push the protective sleeve 230 outward. The protective sleeve 230 drives the external electrical component connector to quickly separate from the adapter 600. This is to ensure safety, prevent fire risks and personal injuries, and at the same time protect the digital current and voltage meter 100 and the external electrical components from further damage, extend their service life, limit the scope of failure, and reduce maintenance costs.

[0047] like Figure 4 and Figure 5 As shown, an L-shaped ring groove 231 is provided on the inner side of the protective sleeve 230, a connecting ring 260 in contact with the protective sleeve 230 is fixedly connected to the top of the plastic ring 220, and elastic silicone membrane petals 270 distributed in a ring shape and in contact with the L-shaped ring groove 231 are fixedly connected to one end of the connecting ring 260, and two adjacent elastic silicone membrane petals 270 are in contact with each other, and all the elastic silicone membrane petals 270 together form a round cover of the socket of the digital display current and voltage meter 100;

[0048] When the opening of the protective sleeve 230 is close to the adapter 600, the protective sleeve 230 squeezes the elastic silicone membrane petal 270 through the L-shaped ring groove 231, so that the elastic silicone membrane petal 270 is bent and two adjacent elastic silicone membrane petals 270 are squeezed against each other to form a round cover-shaped flexible structure to block the opening of the protective sleeve 230, which can prevent dust, water vapor and other impurities from entering the interior of the adapter 600, so that the interior of the adapter 600 is always kept clean and dry, so as to ensure that the adapter 600 can be used normally;

[0049] When the opening of the protective sleeve 230 is at a position away from the adapter 600, the protective sleeve 230 drives the L-shaped ring groove 231 to move away from the elastic silicone membrane 270, and the elastic silicone membrane 270 loses its obstruction and returns to its original state, exposing the opening of the protective sleeve 230, so that the staff can easily connect the external electrical component plug with the adapter 600;

[0050] When the external electrical component plug drives the protective sleeve 230 to move toward the adapter 600, the protective sleeve 230 re-extrudes the elastic silicone membrane petal 270 through the L-shaped ring groove 231, which enables the elastic silicone membrane petal 270 to bend again and elastically squeeze the external electrical component plug, thereby reducing the probability of the electrical component plug loosening during normal use.

[0051] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, a mounting bracket of a combined multi-loop voltage and current monitoring terminal device includes an L-shaped mounting frame 300, a sliding cavity 310 is opened on the top of the L-shaped mounting frame 300, a slide plate 400 is slidably connected inside the sliding cavity 310, a top plate 500 is fixedly connected on the top of the slide plate 400, a digital current and voltage meter 100 is arranged between the L-shaped mounting frame 300 and the top plate 500, a mounting sleeve 210 is fixedly connected to the opposite ends of the L-shaped mounting frame 300 and the top plate 500, and the opposite ends of the L-shaped mounting frame 300 and the top plate 500 are both threadedly connected with uniformly distributed adapters 600, the male head of the adapter 600 is electrically connected to the socket of the digital current and voltage meter 100, and the female head of the adapter 600 penetrates the inner side of the mounting sleeve 210;

[0052] A metal spring 700 is provided between the slide plate 400 and the slide cavity 310. The metal spring 700 is always in a compressed state. The metal spring 700 can always apply a downward thrust to the top plate 500 through the slide plate 400, so that the top plate 500 cooperates with the L-shaped mounting frame 300 to lock the digital current and voltage meter 100 more stably; an adjustment handle 800 is fixedly connected to the top of the top plate 500, and the corners of the adjustment handle 800 are rounded, which can reduce the difficulty of the staff to pull up the top plate 500, so as to achieve the effect of facilitating the staff to load and unload the digital current and voltage meter 100;

[0053] Adapter 600 is a practical component that connects two different interfaces. It can solve the problem of interface incompatibility, expand the scope of use of equipment, and improve the efficiency of use. There are many types. According to the interface connection form, it can be divided into direct plug-in type, wired type and plate type; according to the interface type, it can be divided into HDMI, VGA, DisplayPort, USB, etc. In actual applications, the staff needs to customize the matching adapter 600 according to the socket of the digital current and voltage meter 100 and the connector of the external electrical component. The specific model needs to be selected according to the actual situation, which will not be elaborated here;

[0054] First, fix the L-shaped mounting frame 300 at the corresponding position by bolts, then lift the top plate 500, plug the downward socket of the digital current and voltage meter 100 with the corresponding adapter 600 at the bottom, then move the top plate 500 back, the top plate 500 drives the corresponding adapter 600 above to plug with the upward socket of the digital current and voltage meter 100, and lock the digital current and voltage meter 100 between the top plate 500 and the L-shaped mounting frame 300, then the staff can electrically connect the electrical components such as the current transformer used for the detection circuit with the adapter 600 through the plug corresponding to the adapter 600. At this time, the electrical components establish connection with the digital current and voltage meter 100 through the adapter 600, and the electrical components can transmit the voltage and current data of the normal detection circuit to the digital current and voltage meter 100.

[0055] Working principle: After the digital current and voltage meter 100 is installed on the inner side of the L-shaped mounting frame 300, if the staff needs to quickly connect the external electrical component to the digital current and voltage meter 100, the staff first pulls out the protective sleeve 230, and the protective sleeve 230 drives the L-shaped ring groove 231 away from the elastic silicone membrane flap 270. At this time, the elastic silicone membrane flap 270 loses its obstruction and returns to a vertical state. At the same time, the opening of the protective sleeve 230 just loses its obstruction. At this time, the staff can insert the plug of the external electrical component into the protective sleeve 230 without hindrance, and then the staff plugs the plug of the external electrical component into the inside of the adapter 600. The plug of the external electrical component drives the protective sleeve 230 to move together, and the installation sleeve 210 limits the moving trajectory of the plug of the external electrical component through the protective sleeve 230 to avoid the plug of the external electrical component from moving during the connection process. The probability of tilting or offsetting occurs, and at the same time, the protective sleeve 230 re-extrudes the elastic silicone membrane petal 270 through the L-shaped ring groove 231, which can make the elastic silicone membrane petal 270 bend again and elastically squeeze the external electrical component plug, which can reduce the probability of the electrical component plug loosening during normal use, until the electrical component plug and the female head of the adapter 600 are plugged into place. Compared with the existing combined multi-circuit voltage and current monitoring terminal equipment, this can not only reduce the difficulty for the staff to connect the external electrical components with the digital current and voltage meter 100, but also when the staff needs to maintain the digital current and voltage meter 100, the staff can easily take out and install the digital current and voltage meter 100 without disconnecting the external electrical components, which also effectively reduces the difficulty of subsequent installation and maintenance for the staff.

[0056] It should be noted that the digital current and voltage meter 100, adapter 600 and current transformer in the above description are all relatively mature devices in existing technology applications. The specific models can be selected according to actual needs. At the same time, the digital current and voltage meter 100 and the current transformer can be powered by a built-in power supply or by AC power. The specific power supply method is selected according to the situation and will not be elaborated here.

[0057] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined multi-circuit voltage and current monitoring terminal device, comprising a digital current and voltage meter (100), characterized in that: The surface of the digital current and voltage meter (100) is fixedly connected with evenly distributed socket auxiliary mechanisms (200), and the socket of the digital current and voltage meter (100) is arranged on the inner side of the socket auxiliary mechanism (200); The socket auxiliary mechanism (200) comprises a mounting sleeve (210), wherein the mounting sleeve (210) is fixedly connected to the surface of the digital current and voltage meter (100), the socket of the digital current and voltage meter (100) is arranged on the inner side of the mounting sleeve (210), one end of the mounting sleeve (210) is fixedly connected to a plastic ring (220), the surface of the plastic ring (220) is slidably connected to a protective sleeve (230), one end of the mounting sleeve (210) is provided with a mounting cavity (211), the interior of the mounting cavity (211) is slidably connected to a guide rod (240), one end of the guide rod (240) passes through the mounting cavity (211) and extends to the outside of the plastic ring (220), the guide rod (240) is fixedly connected to the plastic ring (220), and a rubber spring (250) which is always in a compressed state is arranged between the guide rod (240) and the mounting cavity (211).

2. A combined multi-circuit voltage and current monitoring terminal device as claimed in claim 1, characterized in that: An L-shaped annular groove (231) is provided on the inner side of the protective sleeve (230); a connecting ring (260) in contact with the protective sleeve (230) is fixedly connected to the top of the plastic ring (220); elastic silicone membrane petals (270) distributed in an annular shape and in contact with the L-shaped annular groove (231) are fixedly connected to one end of the connecting ring (260); two adjacent elastic silicone membrane petals (270) are in contact with each other, and all the elastic silicone membrane petals (270) together form a round cover for the socket of a digital display current and voltage meter (100).

3. The combined multi-circuit voltage and current monitoring terminal device according to claim 1, characterized in that: A limiting ring groove (232) is provided on the inner side of the protective sleeve (230), and the plastic ring (220) is slidably connected to the inside of the limiting ring groove (232).

4. A combined multi-circuit voltage and current monitoring terminal device as claimed in claim 3, characterized in that: A positioning groove (221) is provided on the surface of the plastic ring (220), and a positioning block (280) in contact with the limiting ring groove (232) is clamped inside the positioning groove (221).

5. A combined multi-circuit voltage and current monitoring terminal device as claimed in claim 4, characterized in that: The positioning block (280) is a rubber material component, and the positioning groove (221) and the positioning block (280) are both in matching arc shapes.

6. The combined multi-circuit voltage and current monitoring terminal device according to claim 1, characterized in that: One end of the rubber spring (250) is fixedly connected to a slip ring (290) that is slidably connected to the installation cavity (211), and one end of the slip ring (290) is fixedly connected to the guide rod (240).

7. A combined multi-circuit voltage and current monitoring terminal device as claimed in claim 6, characterized in that: The number of the guide rods (240) is not less than two, and the guide rods (240) are fixedly connected to one end of the guide rod (240) in a ring shape around the axis of the slip ring (290).

8. A mounting bracket for a combined multi-circuit voltage and current monitoring terminal device, comprising the combined multi-circuit voltage and current monitoring terminal device according to any one of claims 1 to 7 and an L-shaped mounting bracket (300), characterized in that: The top of the L-shaped mounting frame (300) is provided with a sliding cavity (310), the interior of the sliding cavity (310) is slidably connected to a slide plate (400), the top of the slide plate (400) is fixedly connected to a top plate (500), the digital current and voltage meter (100) is arranged between the L-shaped mounting frame (300) and the top plate (500), the mounting sleeve (210) is respectively fixedly connected to the opposite ends of the L-shaped mounting frame (300) and the top plate (500), the opposite ends of the L-shaped mounting frame (300) and the top plate (500) are both threadedly connected to uniformly distributed adapters (600), the male head of the adapter (600) is electrically connected to the socket of the digital current and voltage meter (100), and the female head of the adapter (600) passes through the inner side of the mounting sleeve (210).

9. The mounting bracket of the combined multi-circuit voltage and current monitoring terminal device according to claim 8, characterized in that: A metal spring (700) is arranged between the slide plate (400) and the slide cavity (310), and the metal spring (700) is always in a compressed state.

10. The mounting bracket of the combined multi-circuit voltage and current monitoring terminal device according to claim 8, characterized in that: An adjustment handle (800) is fixedly connected to the top of the top plate (500), and the corners of the adjustment handle (800) are rounded.

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