Input power-off protection device for switching power supply and auxiliary installation equipment of input power-off protection device

Abstract

The invention discloses an input power-off protection device for a switching power supply and auxiliary installation equipment of the input power-off protection device, and belongs to the field of power-off protection devices.The input power-off protection device for the switching power supply and the auxiliary installation equipment are included, the power-off protection device comprises a shell, and a first bent plate and a second bent plate are arranged in the shell in a sliding mode; the auxiliary installation equipment comprises an installation support and a positioning mechanism, the power-off protection device and the auxiliary installation equipment, the power-off protection device can be easily installed and disassembled, the power-off protection device is inserted into a rectangular groove during installation, a trapezoidal sliding table is made to move through a cylindrical rod, and the power-off protection device descends; the first rectangular clamping plate and the second rectangular clamping plate achieve automatic clamping and fixing, and during dismounting, the cylindrical rod enables the trapezoidal sliding table to move, the power-off protection device to ascend, the first rectangular clamping plate and the second rectangular clamping plate loosen the mounting rail, so that the power-off protection device is lifted, and meanwhile, the power-off protection device is easily dismounted.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power-off protection devices, in particular to an input power-off protection device for switching power supply and an auxiliary installation equipment thereof. BACKGROUND

[0002] The switching power supply is a device for converting alternating current into stable direct current, which is often used to provide reliable power supply for control systems, communication equipment and the like. The switching power supply can obtain input power through the bus or terminal in the power distribution cabinet. The circuit breaker in the power distribution cabinet can provide overcurrent protection for the switching power supply to prevent it from being damaged due to input abnormalities. The direct current output by the switching power supply can be used in the control loop (such as PLC, relay, etc.) in the power distribution cabinet to realize automatic management.

[0003] The power-off protection device in the prior art is commonly a circuit breaker, which is usually provided with a one-way movable buckle at the bottom. During use, the bottom buckle is pushed to clamp the circuit breaker on the slide rail. However, in actual use, several circuit breakers are usually arranged. If one of them fails and needs to be removed for replacement or repair, the bottom buckle needs to be pulled to remove the circuit breaker. However, the buckle is located at the bottom, and wires may be arranged thereon. In addition, several circuit breakers are arranged on the same horizontal plane, which makes it difficult to remove the circuit breakers and causes certain troubles to the construction personnel. SUMMARY

[0004] The present application provides an input power-off protection device for switching power supply and an auxiliary installation equipment thereof, which can solve the problem of difficult removal of several parallel arranged power-off protection devices in the prior art.

[0005] An input power-off protection device for switching power supply, comprising a shell, a first bending plate and a second bending plate are slidably arranged in the shell, and a first rectangular clamping plate and a second rectangular clamping plate are fixedly arranged on the first bending plate and the second bending plate, respectively.

[0006] Further, a cavity is arranged in the shell, a fourth spring and a fifth spring are fixedly arranged on both sides of the cavity, the first bending plate is connected to the fourth spring, and the second bending plate is connected to the fifth spring. Grooves are arranged on both sides of the shell, the first bending plate and the second bending plate pass through the grooves and are slidably connected thereto, rectangular grooves are arranged at the ends of the first bending plate and the second bending plate, a first through groove is arranged on the first bending plate, a second through groove is arranged on the second bending plate, the first rectangular clamping plate passes through the second through groove, a second rack is fixedly arranged on the first bending plate, and a third rack is fixedly arranged on the second bending plate.

[0007] Further, a connecting shaft is arranged to rotate in the cavity and located between the second rack and the third rack, a first gear is coaxially and fixedly arranged on the connecting shaft, a second gear is coaxially and fixedly arranged on the first gear, the first gear is engaged with the second rack and the third rack, and the second gear is located outside the second rack and the third rack.

[0008] The application discloses an auxiliary installation device for an input power-off protection device of a switching power supply, which comprises a mounting bracket and a positioning mechanism.

[0009] Further, an intermediate transverse plate is fixedly arranged at the middle of the main bracket, a first sliding groove is formed in the intermediate transverse plate, a first opening is arranged at one end of the main bracket and located at the first sliding groove, a second sliding groove is formed in the bottom of the main bracket, a second opening is arranged at one end of the main bracket and located at the second sliding groove, the first opening and the second opening are arranged in a one-above-the-other mode, mounting pieces are fixedly arranged at both ends of the bottom of the main bracket, and a plurality of mounting holes are formed in the mounting pieces.

[0010] Further, the positioning mechanism comprises a U-shaped plate, a cylindrical rod is slidably arranged on the U-shaped plate, the cylindrical rod is slidably connected with the U-shaped plate, a trapezoidal sliding table is fixedly arranged on the cylindrical rod and located at the inner side of the U-shaped plate of the U-shaped plate, a circular piece is fixedly arranged at the other end of the cylindrical rod, a third sliding groove is symmetrically formed in the outer side of the U-shaped plate of the cylindrical rod, and a limiting mechanism is slidably arranged in the third sliding groove.

[0011] Further, the limiting mechanism comprises first clamping plates and second clamping plates, the first clamping plates and the second clamping plates are rotatably arranged, a rotating shaft is arranged at the rotating connection position, the rotating shaft is slidably connected with the third sliding groove, the first clamping plates on both sides and the second clamping plates on both sides are fixedly connected through short rods, first springs are arranged between the first clamping plates and the second clamping plates on each side, and a rectangular plate is slidably arranged on the cylindrical rod and located between the limiting mechanism and the U-shaped plate.

[0012] Further, a fourth sliding groove is arranged at the bottom of the U-shaped plate, a sliding block is fixedly arranged at the bottom of the trapezoidal sliding table, the sliding block is slidably connected with the fourth sliding groove, a second spring is fixedly arranged in the fourth sliding groove, and the other end of the second spring is fixedly connected with the sliding block.

[0013] Further, a cylindrical sliding rod is slidably arranged above the U-shaped plate, a U-shaped clamping plate is fixedly arranged at the bottom end of the cylindrical sliding rod, a roller is rotatably arranged in the U-shaped clamping plate, the roller is in contact with the inclined surface of the trapezoidal sliding table, a rectangular piece is fixedly connected with the cylindrical sliding rod and passes through the top end of the U-shaped clamping plate, a third spring is arranged between the U-shaped plate and the U-shaped clamping plate, and the third spring is sleeved between the rectangular piece and the U-shaped clamping plate.

[0014] Further, the rectangular piece is fixed with a mounting rail in the middle, fifth sliding grooves are opened on both sides of the mounting rail on the rectangular piece, sixth springs are fixed in the fifth sliding grooves on both sides, rectangular vertical plates are fixed on the sixth springs, and a first rack is further fixed at the top of the U-shaped plate.

[0015] Beneficial effects 1. The auxiliary installation equipment matched with the power-off protection device is provided, easy installation and disassembly of the power-off protection device are realized, the first rectangular clamping plate and the second rectangular clamping plate are slidably arranged in the power-off protection device, the power-off protection device can be fixed on the auxiliary installation equipment through the first rectangular clamping plate and the second rectangular clamping plate, the trapezoidal sliding table is slidably arranged in the auxiliary installation equipment, the mounting rail on the trapezoidal sliding table is moved up and down, the power-off protection device is further moved up and down, the power-off protection device is inserted into the rectangular groove during installation, the trapezoidal sliding table is moved through the cylindrical rod, the power-off protection device is lowered, and the first rectangular clamping plate and the second rectangular clamping plate are automatically clamped and fixed, when disassembling, the trapezoidal sliding table is moved through the cylindrical rod, the power-off protection device is raised, the first rectangular clamping plate and the second rectangular clamping plate are loosened, and the power-off protection device is lifted and disassembled easily.

[0016] 2. The limiting mechanism is further arranged on the positioning mechanism, the limiting mechanism mainly comprises a first clamping plate, a second clamping plate, a rotating shaft and a first spring, the first clamping plate and the second clamping plate are engaged to fix the positioning mechanism, the positioning mechanism is fixed in the mounting support, the cylindrical rod on the positioning mechanism can slide relative to the limiting mechanism, the trapezoidal sliding table can be moved without affecting the overall fixation of the positioning mechanism, the overall structure of the equipment is simple, the functionality is strong, a plurality of positioning mechanisms can be installed on the mounting support according to needs, and different use requirements are met. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is an installation schematic view of the power-off protection device of the application; Figure 2 It is an overall structure schematic view of the mounting support of the application; Figure 3 It is an overall structure schematic view of the positioning mechanism of the application; Figure 4 It is a front view of the positioning mechanism of the application; Figure 5 It is an internal structure schematic view of the power-off protection device of the application; Figure 6 It is an enlarged schematic view of the A part structure of the application; Figure 7 It is a working schematic view of the limiting mechanism of the application; Figure 8 The installation front view of the power-off protection device of the present application; Figure 9 The sectional view at A-A of the present application.

[0018] Explanation of reference signs: 1, mounting bracket; 2, positioning mechanism; 3, power-off protection device; 101, main bracket; 102, intermediate cross plate; 103, first sliding groove; 104, mounting piece; 105, second sliding groove; 106, first opening; 107, second opening; 108, mounting hole; 201, cylindrical rod; 202, circular piece; 203, U-shaped plate; 204, rectangular plate; 205, third sliding groove; 206, first clamping plate; 207, second clamping plate; 208, rotating shaft; 209, first spring; 210, trapezoidal sliding table; 211, fourth sliding groove; 212, second spring; 213, cylindrical sliding rod; 214, third spring; 215, U-shaped clamping plate; 216, roller; 217, first rack; 218, rectangular piece; 219, mounting rail; 220, fifth sliding groove; 221, sixth spring; 222, rectangular vertical plate; 223, short rod; 224, sliding block; 301, shell; 302, cavity; 303, fourth spring; 304, first bent plate; 305, fifth spring; 306, second bent plate; 307, first through slot; 308, second through slot; 309, first rectangular clamping plate; 310, second rectangular clamping plate; 311, rectangular slot; 312, second rack; 313, third rack; 314, connecting shaft; 315, first gear; 316, second gear. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] The power-off protection device in the prior art is commonly a circuit breaker, which is usually provided with a one-way moving buckle at the bottom end. During use, the bottom buckle is pushed to clamp the circuit breaker on the sliding rail. However, in actual use, several circuit breakers are usually arranged. If one of them fails and needs to be removed for replacement or repair, the bottom buckle needs to be pulled to remove the circuit breaker. However, the buckle is located at the bottom, and wires may be arranged thereon. In addition, several circuit breakers are arranged on the same horizontal plane, which makes it difficult to remove the circuit breakers and causes certain troubles to the construction personnel. Therefore, the present embodiment provides an input power-off protection device for switching power supply and an auxiliary installation equipment for power-off protection device to solve the above problems.

[0021] As Figure 1 shown, the application provides an input power-off protection device for switching power supply and an auxiliary installation equipment thereof, which specifically comprises a power-off protection device 3 and an auxiliary installation equipment, wherein the auxiliary installation equipment comprises an installation support 1 and a positioning mechanism 2, as Figure 2 shown, the installation support 1 comprises a main support 101, an intermediate transverse plate 102 is fixedly arranged at the middle position of the main support 101, a first sliding groove 103 is formed on the intermediate transverse plate 102, a first opening 106 is arranged at one end of the first sliding groove 103 on the main support 101, a second sliding groove 105 is further formed on the bottom of the main support 101, a second opening 107 is arranged at one end of the second sliding groove 105 on the main support 101, the first opening 106 and the second opening 107 are arranged in a corresponding manner, the main support 101 is in a semi-closed structure at the positions of the first opening 106 and the second opening 107, mounting pieces 104 are fixedly arranged at both ends of the bottom of the main support 101, a plurality of mounting holes 108 are formed on the mounting pieces 104, the installation support 1 can be fixed on the installation position as a whole through the cooperation of the mounting screws in the mounting holes 108, in use, the positioning mechanism 2 is installed through the semi-closed part of the installation support 1 and is moved inward along the first sliding groove 103 and the second sliding groove 105, a plurality of positioning mechanisms 2 can be installed on the installation support 1, and the positioning mechanism 2 can be fixed through its own structure after being moved to the specified position.

[0022] If the power-off protection device 3 is directly installed on the installation support 1, the single power-off protection device 3 cannot be adjusted, and there is still some inconvenience when it needs to be repaired or replaced, therefore, the embodiment adds the positioning mechanism 2 to solve the problem of inconvenient disassembly of the power-off protection device 3.

[0023] As Figure 3 and Figure 4As shown, the positioning mechanism 2 comprises a U-shaped plate 203, a cylindrical rod 201 is slidably arranged on the U-shaped plate 203, the cylindrical rod 201 is slidably connected with the U-shaped plate 203, a trapezoidal sliding table 210 is fixedly arranged on the cylindrical rod 201 and located inside the U-shaped plate 203, a circular plate 202 is also fixedly arranged on the cylindrical rod 201, a third sliding groove 205 is symmetrically formed on the cylindrical rod 201 and located outside the U-shaped plate 203, a limiting mechanism is slidably arranged on the third sliding groove 205, the limiting mechanism is used for fixing the positioning mechanism 2 on the mounting bracket 1, the limiting mechanism comprises a first clamping plate 206 and a second clamping plate 207, the first clamping plate 206 and the second clamping plate 207 are rotatably arranged, a rotating shaft 208 is connected at the rotating connection, the rotating shaft 208 is slidably connected with the third sliding groove 205, the limiting mechanism is divided into a fixed end and a driving end through the rotating shaft 208, the end close to the U-shaped plate 203 is the fixed end, and the end close to the circular plate 202 is the driving end, the first clamping plate 206 on one side and the second clamping plate 207 on the other side are fixedly connected through a short rod 223, and the first clamping plate 206 on each side and the second clamping plate 207 are connected with a first spring 209, the short rod 223 and the first spring 209 are located at the driving end, and a rectangular plate 204 is slidably arranged on the cylindrical rod 201 and located between the limiting mechanism and the U-shaped plate 203.

[0024] In use, the positioning mechanism 2 is slid into the mounting bracket 1, and the limiting mechanism is moved to the end close to the circular plate 202, as shown in the figure, Figure 7 At this time, the upper end and the lower end of the rectangular plate 204 are located in the first sliding groove 103 and the second sliding groove 105 respectively, after being moved to the specified position, the short rod 223 at the driving end is pinched, the distance between the first clamping plate 206 and the second clamping plate 207 at the fixed end becomes smaller (the distance is smaller than the distance between the middle horizontal plate 102 and the main bracket 101), then the limiting mechanism is moved to make the first clamping plate 206 and the second clamping plate 207 at the fixed end move to the position between the middle horizontal plate 102 and the bottom of the main bracket 101, the short rod 223 at the driving end is released, the first spring 209 restores the deformation, and under the action of the first spring 209, the first clamping plate 206 and the second clamping plate 207 at the fixed end are tightly attached to the mounting bracket 1 respectively, the limiting mechanism fixes the positioning mechanism 2 on the mounting bracket 1, and the limiting of the positioning mechanism 2 is realized, wherein the U-shaped plate 203 is slidably connected with the bottom of the mounting bracket 1, that is, the U-shaped plate 203 and the mounting bracket 1 can remain relatively stationary during the movement of the cylindrical rod 201.

[0025] In actual operation, when facing a plurality of power-off protection devices 3 in the same horizontal plane, the surrounding power-off protection devices 3 may cause obstruction during inspection or removal, in the embodiment, the trapezoidal sliding table 210 cooperates with the roller 216 to automatically lift the power-off protection device 3, which is convenient for the operator to check, maintain and replace.

[0026] As shown in the figure, Figure 3 andFigure 4 As shown, the bottom of the U-shaped plate 203 is provided with a fourth sliding groove 211, the bottom of the trapezoidal sliding table 210 is fixedly provided with a sliding block 224, the sliding block 224 is in sliding connection with the fourth sliding groove 211, the fourth sliding groove 211 is also fixedly provided with a second spring 212, the other end of the second spring 212 is fixedly connected with the sliding block 224, the upper side of the U-shaped plate 203 is also slidably provided with a cylindrical sliding rod 213, the bottom end of the cylindrical sliding rod 213 is fixedly provided with a U-shaped clamping plate 215, the U-shaped clamping plate 215 is rotatably provided with a roller 216, the roller 216 is in contact with the inclined surface of the trapezoidal sliding table 210, the cylindrical sliding rod 213 penetrates through the top end of the U-shaped clamping plate 215 and is fixedly connected with a rectangular piece 218, the third spring 214 is arranged between the U-shaped plate 203 and the U-shaped clamping plate 215, the third spring 214 is sleeved between the rectangular piece 218 and the U-shaped clamping plate 215, the middle position of the rectangular piece 218 is fixedly provided with a mounting track 219, the fifth sliding grooves 220 are arranged on both sides of the mounting track 219 of the rectangular piece 218, the sixth springs 221 are fixedly arranged in the fifth sliding grooves 220, the rectangular vertical plates 222 are fixedly arranged on the sixth springs 221, and the top end of the U-shaped plate 203 is fixedly provided with a first gear rack 217 beside the rectangular piece 218.

[0027] In use, after the rectangular plate 204 and the limiting mechanism fix the positioning mechanism 2 on the mounting bracket 1, the cylindrical rod 201 is pushed to slide along the direction of the U-shaped plate 203, at this time, the trapezoidal sliding table 210 slides along the fourth sliding groove 211 and compresses the second spring 212, with the movement of the trapezoidal sliding table 210, the roller 216 moves upward along the inclined surface of the trapezoidal sliding table 210, the roller 216 and the cylindrical sliding rod 213 thereon are further lifted and compress the third spring 214, the power-off protection device 3 is arranged on the rectangular piece 218, the cylindrical sliding rod 213 is lifted to realize that the power-off protection device 3 is lifted upward together, and the power-off protection device 3 is convenient to replace or install.

[0028] For the common situation that the bottom buckle of the power-off protection device 3 needs to be manually pulled, the embodiment provides a new power-off protection device 3, which realizes automatic lifting and separation of the power-off protection device 3 in cooperation with the auxiliary installation equipment, and the operation is simple and convenient for operators to overhaul, replace and the like.

[0029] As Figure 5 and Figure 6As shown, the power-off protection device 3 comprises a shell 301, a cavity 302 is arranged inside the shell 301, fourth springs 303 and fifth springs 305 are fixedly arranged on both sides in the cavity 302, first bending plates 304 are connected to the fourth springs 303, second bending plates 306 are connected to the fifth springs 305, notches are arranged on both sides of the shell 301, the first bending plates 304 and the second bending plates 306 pass through the notches and are slidably connected to the notches, rectangular grooves 311 are arranged at the ends of the first bending plates 304 and the second bending plates 306, first through grooves 307 are arranged on the first bending plates 304, second through grooves 308 are arranged on the second bending plates 306, first rectangular clamping plates 309 are fixedly arranged on the first bending plates 304 and pass through the second through grooves 308, second rectangular clamping plates 310 are fixedly arranged on the second bending plates 306, second racks 312 are fixedly arranged on the first bending plates 304, third racks 313 are fixedly arranged on the second bending plates 306, a connecting shaft 314 is rotatably arranged in the cavity 302 and located between the second racks 312 and the third racks 313, a first gear 315 is coaxially and fixedly arranged on the connecting shaft 314, a second gear 316 is coaxially and fixedly arranged on the first gear 315, the first gear 315 is engaged with the second racks 312 and the third racks 313, and the second gear 316 is located outside the second racks 312 and the third racks 313.

[0030] As Figure 8 and Figure 9As shown, the power-off protection device 3 is installed in the mounting rail 219 of the rectangular member 218 during use. The specific installation steps are as follows. The bottom of the power-off protection device 3 is provided with a hole communicating with the internal cavity 302. During installation, the two side rectangular grooves 311 on the power-off protection device 3 are inserted into the rectangular vertical plate 222. At this time, the first rack 217 also enters the cavity 302 of the power-off protection device 3 from the hole in the bottom of the power-off protection device 3 and is just engaged with the second gear 316. At this time, the first rectangular clamping plate 309 and the second rectangular clamping plate 310 are respectively located on the two sides of the mounting rail 219 and do not contact the mounting rail 219. With the descent of the cylindrical slide rod 213, the rectangular member 218 descends synchronously with the power-off protection device 3 thereon. The second gear 316 is engaged with the first rack 217 during the descent process to realize the clockwise rotation thereof. The second gear 316 rotates coaxially with the first gear 315, that is, the first gear 315 rotates clockwise, so that the first bent plate 304 and the second bent plate 306 move towards each other until the first rectangular clamping plate 309 and the second rectangular clamping plate 310 clamp the mounting rail 219 from both ends. At this time, the rectangular vertical plate 222 also moves with the two side rectangular grooves 311 and stretches the sixth spring 221. The first rectangular clamping plate 309 and the second rectangular clamping plate 310 fix the power-off protection device 3 as a whole on the positioning mechanism 2. When it is necessary to remove the power-off protection device 3 from the positioning mechanism 2, the trapezoidal slide table 210 is pushed, and the rectangular member 218 moves upwards synchronously with the power-off protection device 3 thereon. During this process, the second gear 316 is engaged with the first rack 217 during the descent process to realize the counterclockwise rotation thereof. The first gear 315 rotates counterclockwise, and the first bent plate 304 and the second bent plate 306 move away from each other. The first rectangular clamping plate 309 and the second rectangular clamping plate 310 loosen the mounting rail 219, so that the power-off protection device 3 is easily taken. In the initial state, the second spring 212 ensures that the trapezoidal slide table 210 is located at the beginning end of the fourth slide groove 211. The third spring 214 ensures that the roller 216 is located at the lowermost position. The sixth spring 221 ensures that the rectangular vertical plate 222 is located at the beginning position. The fourth spring 303 and the fifth spring 305 ensure that the first bent plate 304 and the second bent plate 306 are located at the initial position.

[0031] In the description of the present application, it is to be understood that the terms "upper", "lower", "left", "right", and the like refer to the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, and a particular orientation configuration and operation, therefore, cannot be understood as a limitation on the present application. In addition, "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0032] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] The above describes one embodiment of the present application in detail, but the content described is only the preferred embodiment of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made within the scope of the present application shall still belong to the scope of the present application.

Claims

1. An input power-off protection device for a switching power supply, characterized by, It includes a shell (301), the first bending plate (304) and the second bending plate (306) are slidably arranged in the shell (301), and the first rectangular clamping plate (309) and the second rectangular clamping plate (310) are respectively fixedly arranged on the first bending plate (304) and the second bending plate (306).

2. The input power-off protection device for a switching power supply according to claim 1, wherein The cavity (302) is internally provided with the fourth spring (303) and the fifth spring (305) which are respectively fixedly arranged on the two sides, the first bending plate (304) is connected to the fourth spring (303), the second bending plate (306) is connected to the fifth spring (305), notches are formed in the two sides of the shell (301), the first bending plate (304) and the second bending plate (306) pass through the notches and are slidably connected thereto, rectangular grooves (311) are formed in the ends of the first bending plate (304) and the second bending plate (306), the first through groove (307) is arranged on the first bending plate (304), the second through groove (308) is arranged on the second bending plate (306), the first rectangular clamping plate (309) passes through the second through groove (308), the second rack (312) is fixedly arranged on the first bending plate (304), and the third rack (313) is fixedly arranged on the second bending plate (306).

3. The input power failure protection device for a switching power supply as described in claim 2, characterized in that, The connecting shaft (314) is rotatably arranged in the cavity (302) and is located between the second rack (312) and the third rack (313), the first gear (315) is coaxially and fixedly arranged on the connecting shaft (314), the second gear (316) is coaxially and fixedly arranged on the first gear (315), the first gear (315) is engaged with the second rack (312) and the third rack (313), and the second gear (316) is located outside the second rack (312) and the third rack (313).

4. An auxiliary installation device for input power-off protection apparatus for switching power supply, characterized by, The input power-off protection device for a switching power supply is characterized in that it comprises a mounting bracket (1) and a positioning mechanism (2), the positioning mechanism (2) is in sliding connection with the mounting bracket (1), the mounting bracket (1) comprises a main bracket (101), the main bracket (101) is fixedly provided with an intermediate transverse plate (102), the positioning mechanism (2) comprises a U-shaped plate (203), the U-shaped plate (203) is slidably provided with a trapezoidal sliding table (210) and a cylindrical rod (201), the cylindrical rod (201) is in contact with the inclined surface of the trapezoidal sliding table (210), the cylindrical rod (201) is fixedly provided with a mounting track (219), and the mounting track (219) is slidably provided with rectangular vertical plates (222) on the two sides.

5. The auxiliary installation equipment for input power-off protection device of a switching power supply according to claim 4, wherein The middle transverse plate (102) is provided in the middle of the main support (101), the first sliding groove (103) is formed in the middle transverse plate (102), the first opening (106) is formed in one end of the main support (101) and located at the first sliding groove (103), the second sliding groove (105) is formed in the bottom of the main support (101), the second opening (107) is formed in one end of the main support (101) and located at the second sliding groove (105), the first opening (106) and the second opening (107) are in correspondence with each other, the mounting piece (104) is fixedly arranged at the two ends of the bottom of the main support (101), and the mounting hole (108) is formed in the mounting piece (104).

6. The auxiliary installation equipment for input power-off protection device of a switching power supply according to claim 4, wherein The positioning mechanism (2) comprises a U-shaped plate (203), a cylindrical rod (201) is slidably arranged on the U-shaped plate (203), the cylindrical rod (201) is slidably connected with the U-shaped plate (203), a trapezoidal sliding table (210) is fixedly arranged on the cylindrical rod (201) and located at the inner side of the U-shaped plate (203), a circular plate (202) is further fixedly arranged on the other end of the cylindrical rod (201), a third sliding groove (205) is symmetrically formed on the outer side of the U-shaped plate (203) and the cylindrical rod (201), and a limiting mechanism is slidably arranged in the third sliding groove (205).

7. The auxiliary installation equipment for input power-off protection device of a switching power supply according to claim 6, wherein The limiting mechanism comprises first clamping plates (206) and second clamping plates (207), the first clamping plates (206) and the second clamping plates (207) are rotatably arranged, the rotating connection portions are connected through rotating shafts (208), the rotating shafts (208) are slidably connected with the third sliding groove (205), the first clamping plates (206) on the two sides and the second clamping plates (207) on the two sides are fixedly connected through short rods (223), first springs (209) are arranged between the first clamping plates (206) and the second clamping plates (207) on each side, and a rectangular plate (204) is slidably arranged on the cylindrical rod (201) and located between the limiting mechanism and the U-shaped plate (203).

8. The auxiliary installation equipment for input power-off protection device of a switching power supply according to claim 7, wherein A fourth sliding groove (211) is arranged at the bottom of the U-shaped plate (203), a sliding block (224) is fixedly arranged at the bottom of the trapezoidal sliding table (210), the sliding block (224) is slidably connected with the fourth sliding groove (211), a second spring (212) is further fixedly arranged in the fourth sliding groove (211), and the other end of the second spring (212) is fixedly connected with the sliding block (224).

9. The auxiliary installation equipment for input power-off protection device of a switching power supply according to claim 8, wherein A cylindrical sliding rod (213) is further slidably arranged above the U-shaped plate (203), a U-shaped clamping plate (215) is fixedly arranged at the bottom end of the cylindrical sliding rod (213), a roller (216) is rotatably arranged in the U-shaped clamping plate (215), the roller (216) is in contact with the inclined surface of the trapezoidal sliding table (210), the cylindrical sliding rod (213) penetrates through the top end of the U-shaped clamping plate (215) and is fixedly connected with a rectangular piece (218), a third spring (214) is arranged between the U-shaped plate (203) and the U-shaped clamping plate (215), and the third spring (214) is sleeved between the rectangular piece (218) and the U-shaped clamping plate (215).

10. The auxiliary installation equipment for input power-off protection device of a switching power supply according to claim 9, wherein The middle position of the rectangular part (218) is fixedly provided with a mounting rail (219), fifth sliding grooves (220) are arranged on both sides of the mounting rail (219) on the rectangular part (218), sixth springs (221) are fixedly arranged in the fifth sliding grooves (220) on both sides, rectangular vertical plates (222) are fixedly arranged on the sixth springs (221), and a first gear rack (217) is further fixedly arranged at the top end of the U-shaped plate (203) beside the rectangular part (218).

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