Online automatic switching device of low-voltage frequency converter

Abstract

The invention discloses an online automatic switching device of a low-voltage frequency converter, and belongs to the technical field of frequency converter control equipment. Aiming at the problem that the structure for controlling the switching of the frequency converter in the existing product needs to be driven by a power supply, the invention provides the following technical scheme: the frequency converter comprises a control cabinet and two frequency converter main bodies arranged in the control cabinet. According to the invention, the automatic switching part is arranged in the control cabinet, the control switches of the main frequency converter and the auxiliary frequency converter in the frequency converter system are supported, and then the other control switch is automatically switched on by means of the tripping power of the control switch, so that the automatic switching of the frequency converters is realized; an existing controller and a related driving structure and a standby power supply are replaced by a mechanical structure, the manufacturing cost of equipment is reduced, the back plate of the control cabinet is synchronously opened when the automatic switching component moves, and therefore workers can conveniently overhaul the tripped main frequency converter.

Description

Technical Field

[0001] The invention relates to the technical field of frequency converter control equipment, in particular to an online automatic switching device for a low-voltage frequency converter. Background Art

[0002] As automated production becomes more and more popular, the requirements for production continuity are getting higher and higher, and the application of frequency converters is becoming more and more extensive. However, in important places, once the frequency converter fails, it will cause production accidents or even safety accidents. In this case, the online automatic switching of low-voltage frequency converters is particularly important.

[0003] There is a Chinese patent with authorization announcement number CN114268165B, which discloses an online low-voltage inverter automatic switching device, including: a body, a socket mechanism, a plug mechanism and a driving mechanism, wherein the body includes a chassis, an indicator light and an alarm light installed on the chassis, a control computer arranged on the side of the chassis and a placement rack installed in the chassis. The present invention realizes the automatic operation of the knob switch to select any inverter as the main inverter after a fault through the socket mechanism, the plug mechanism and the driving mechanism. When the main inverter is running, the standby inverter switches to the hot standby state, and the standby inverter system is in the hot standby state. When the main inverter system suddenly fails, the main inverter sends a fault signal to the standby inverter, automatically starts the standby inverter, and sends an alarm prompt at the same time, thereby greatly shortening the fault time and reducing the uncertainty of human operation. It is a control scheme suitable for relatively important places and is easy to promote and use.

[0004] Although the technical solution in the above patent document realizes the automatic switching of the main inverter to the sub-inverter in the inverter system, it is implemented by combining the controller and the related auxiliary drive structure in completing the switching operation of the inverter system. The configuration of the controller and the related auxiliary drive structure not only requires a high assembly cost, but the operation of the controller and the related auxiliary drive structure also requires power supply, which requires the internal configuration of the equipment with a related standing power supply, further increasing the manufacturing cost of the equipment. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides an online automatic switching device for a low-voltage frequency converter, which supports the control switches of the main frequency converter and the auxiliary frequency converter in the frequency converter system by arranging an automatic switching component inside the control cabinet, and then automatically closes the other control switch with the help of the tripping power of the control switch, thereby realizing automatic switching of the frequency converter, replacing the existing controller and related drive structure and backup power supply with a mechanical structure, reducing the manufacturing cost of the equipment, and the back panel of the control cabinet is opened synchronously when the automatic switching component moves, so as to facilitate the staff to repair the tripped main frequency converter, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An online automatic switching device for a low-voltage frequency converter comprises a control cabinet and a frequency converter main body arranged inside the control cabinet, wherein the frequency converter main body comprises two frequency converter main bodies, which are used to act as a main frequency converter and a sub-frequency converter in a low-voltage frequency converter system, and an automatic switching component for switching between the main frequency converter and the sub-frequency converter is arranged inside the control cabinet, wherein the automatic switching component is composed of a support seat, a switching mechanism, a locking mechanism, a signal transmitter and a contact switch;

[0008] A plurality of control switches are installed on the support base for docking with the corresponding inverter body, and the switching mechanism, signal transmitter and contact switch are all arranged on the support base, wherein the switching mechanism is used to switch and adjust the plurality of control switches;

[0009] The switching mechanism is composed of a supporting component and a supporting component, wherein the supporting component includes two corresponding control switches, and the supporting component is located below the supporting component and is used to support the supporting component.

[0010] As a further solution of the present invention, the control cabinet includes a cabinet, a cabinet door for opening and closing is installed at the front cabinet opening of the cabinet, a horizontal plate is integrally arranged inside the cabinet to separate the internal space of the cabinet, the space above the horizontal plate is used as the main space for loading the inverter, and the space below the horizontal plate is used as the auxiliary space for assembling the supporting structure, wherein a partition is fixedly connected to the top of the horizontal plate, and the two inverter bodies are installed on the top outer wall of the horizontal plate and are located on both sides of the partition;

[0011] Two notches are provided on the back shell wall of the main space, corresponding to the corresponding inverter bodies respectively. A cover plate is installed in the left notch by screws, and a back plate is movably connected to the right notch. An inspection port is provided on the back shell wall of the auxiliary space, and an inspection plate is screwed in the inspection port. An alarm light for warning is installed on the top outer wall of the cabinet.

[0012] As a further solution of the present invention, the back panel includes a frame rotatably connected to the right notch through a pin shaft, a groove is provided on the back outer wall of the frame, a shield plate for covering is installed in the groove by screws, and limit buckles for limit locking are symmetrically arranged on the front outer wall of the frame, wherein torsion springs located on the pin shaft are both sleeved on the top and bottom of the frame.

[0013] As a further solution of the present invention, the support seat is composed of a bearing portion and a vertical portion, and its vertical cross section is an L-shaped structure;

[0014] The support assembly includes a U-shaped plate fixedly connected to the bearing part of the support seat by screws, and a front plate is fixedly connected to the front shell wall of the U-shaped plate by bolts, wherein a guide groove is opened on the front inner wall of the U-shaped plate, and the U-shaped plate and the front plate together form a rectangular frame structure, a bottom plate is integrally provided at the bottom of the rectangular frame structure, and a plurality of folding frames are movably connected inside the rectangular frame structure, the plurality of folding frames correspond to the plurality of supporting assemblies one by one, and a force storage member located on the bottom plate is provided between the plurality of folding frames, and the force storage member assists in applying force to the folding frame on the left side.

[0015] As a further solution of the present invention, the folding frame includes two mutually staggered support rods, the top ends of the support rods are fixedly connected to a U-shaped frame, a roller for contacting the supporting assembly is installed in the U-shaped frame through a movable pin, the bottom ends of the support rods are movably connected to a roller for contacting the bottom plate through a pin rod, and the rear ends of the pin rods are slidably connected to the guide grooves;

[0016] The front ends of two adjacent pins are connected by a short connecting plate, and the front ends of the other two pins are connected by a long connecting plate. A return groove is provided on the front plate, and a convex rod is movably connected in the return groove, and the rear end of the convex rod is fixedly connected to the front outer wall of the long connecting plate;

[0017] A guide rod for guiding support is movably connected to the right shell wall of the U-shaped plate, an arc-shaped push plate is fixedly connected to the left side of the guide rod, and a return spring 1 located on the guide rod is sleeved between the arc-shaped push plate and the right inner wall of the U-shaped plate.

[0018] As a further solution of the present invention, the supporting assembly includes a slide rail arranged on both sides of the control switch, a slide sleeve is slidably connected to the slide rail, a telescopic rod 2 for telescopic guidance is fixedly connected to the slide sleeve, the output ends of the two telescopic rods 2 are commonly connected to a support plate, the support plate is located directly above the folding frame, and a telescopic plate for limiting the force storage member is arranged on the bottom outer wall of the left side of the support plate;

[0019] A cavity is provided on the bottom shell wall of the support plate, and a through opening is provided on the cavity shell wall of the cavity, in which a double-sided wedge is movably connected, and single-sided wedges are slidably connected to the inclined surfaces on both sides of the double-sided wedge, and a round rod is fixedly connected to the side of the single-sided wedge away from the double-sided wedge, and one end of the round rod away from the single-sided wedge passes through the corresponding side walls of the cavity, and a limiting frame for limiting the position of the telescopic rod 2 is installed by screws, wherein a return spring 2 is sleeved on the round rod, one end of the return spring 2 is fixedly connected to the single-sided wedge, and the other end of the return spring 2 is arranged on the corresponding inner wall of the cavity.

[0020] As a further solution of the present invention, the contact switch includes a vertical plate fixedly connected to the bearing portion of the support seat, a negative contact piece is installed on the side wall of the vertical plate, a positive contact piece located on the guide rod is provided on the left side of the negative contact piece, and the negative contact piece and the positive contact piece are fitted together to form a closed-loop circuit for activating the signal transmitter and the alarm light.

[0021] As a further solution of the present invention, the locking mechanism includes a sleeve plate fixedly connected to the shell wall on the right side of the partition, a push-pull rod is movably connected to the sleeve plate, a front end of the push-pull rod is fixedly connected to a fixed plate, an inclined groove is provided on the fixed plate, a rod body is slidably connected in the inclined groove, and one end of the rod body away from the inclined groove is fixedly connected to the corresponding sliding sleeve;

[0022] The rear end of the push-pull rod is fixedly connected with a force-applying wedge block, the inclined surface of the force-applying wedge block is slidably connected with a force-bearing wedge block, the side wall of the force-bearing wedge block is fixedly connected with a straight plate, a plurality of rectangular through grooves are opened on the straight plate, a fixing rod is arranged in each of the rectangular through grooves, a sliding plate is sleeved on the fixing rod, three return springs located on the fixing rod are sleeved on the top and bottom of the sliding plate, and a limiting column for limiting the back plate is rotatably connected to the right shell wall of the sliding plate.

[0023] As a further solution of the present invention, the support seat includes a base fixedly connected to the top outer wall of the horizontal plate by bolts, a notch is opened on the bearing part of the base, a carrier plate is connected to the notch through a rotating shaft, and fastening bolts located on the top shell wall of the bearing part are threadedly connected on both sides of the notch, and the bottom end of the fastening bolts is fixedly connected to the carrier plate, which is arranged on the top outer wall of the carrier plate.

[0024] As a further solution of the present invention, the folding frame includes a telescopic rod and an end plate. The telescopic rod is arranged in a U-shaped frame on the support rod, and the output end of the telescopic rod passes through the front shell wall of the U-shaped frame. The end plate is fixedly connected to the output end of the telescopic rod, and the top end of the end plate is slidably connected to a constraint groove opened on the bottom shell wall of the support plate.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. Automatic switching components are arranged inside the control cabinet to support the control switches of the main inverter and the auxiliary inverter in the inverter system, and then the tripping power of the control switch is used to automatically close the other control switch, thereby realizing automatic switching of the inverter, replacing the existing controller and related drive structure and backup power supply with a mechanical structure, and reducing the manufacturing cost of the equipment.

[0027] 2. The automatic switching component mechanically pushes and adjusts the control switches of the main inverter and the sub-inverter in the inverter system, thereby realizing the switch control of the main inverter and the sub-inverter. When the main inverter is running, the sub-inverter does not need to be in the hot standby state, reducing the damage to energy.

[0028] 3. The automatic switching component is composed of a support base, a switching mechanism, a locking mechanism, a signal transmitter and a contact switch. The switching mechanism is used to switch and adjust the control switches of the main inverter and the auxiliary inverter, and the locking mechanism is used to lock the back panel on the control cabinet. When the switching mechanism is running, the locking mechanism is synchronously driven to adjust, thereby realizing the automatic opening of the back panel, so as to facilitate the staff to repair the tripped main inverter and reduce the maintenance burden.

[0029] 4. The switching mechanism is composed of a supporting component and a carrying component, wherein the carrying component can be manually stretched forward for adjustment, thereby facilitating the staff to manually push and pull the relevant control switches.

[0030] 5. The support seat in the switching mechanism can be flipped, so that the support assembly and the supporting assembly loaded thereon can be flipped and adjusted as a whole, thereby facilitating the loading and unloading maintenance of the control switch and further simplifying the convenience of maintenance by the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the three-dimensional structure of an online automatic switching device for a low-voltage inverter Figure 1 ;

[0032] Figure 2 A schematic diagram of the three-dimensional structure of an online automatic switching device for a low-voltage inverter Figure 2 ;

[0033] Figure 3 for Figure 1 A schematic diagram of a partial cross-sectional structure;

[0034] Figure 4 for Figure 3 A schematic diagram of the automatic switching component structure;

[0035] Figure 5 for Figure 4 A schematic diagram of the locking mechanism structure;

[0036] Figure 6 for Figure 5 A schematic diagram of the enlarged local structure at A;

[0037] Figure 7 for Figure 5 A schematic diagram of the enlarged local structure at B;

[0038] Figure 8 This is a schematic diagram of the switching mechanism structure of Example 1 of the present invention;

[0039] Fig. 9 for Figure 8 Schematic diagram of the structure viewed from above;

[0040] Fig.10 for Figure 8 A schematic diagram of the enlarged local structure at C;

[0041] Fig.11 for Figure 8 A magnified schematic diagram of the local structure at D;

[0042] Fig.12 for Fig. 9 A magnified schematic diagram of the local structure at E;

[0043] Fig.13 This is a schematic diagram of the switching mechanism structure of Example 2 of the present invention;

[0044] Fig.14 This is a schematic diagram of the switching mechanism structure of Example 3 of the present invention;

[0045] Fig.15 for Fig.14 Schematic diagram of the structure viewed from above;

[0046] Fig.16 for Fig.15 An enlarged schematic diagram of the local structure at F.

[0047] In the figure: 1, control cabinet; 11, cabinet; 12, cabinet door; 13, horizontal plate; 14, partition; 2, inverter body; 3, back plate; 31, frame; 32, shield; 33, limit buckle; 4, support seat; 41, base; 42, carrier plate;

[0048] 5. Switching mechanism; 51. Support assembly; 511. U-shaped plate; 512. Front plate; 513. Folding frame; 5131. Support rod; 5132. Roller; 5133. Telescopic rod 1; 5134. End plate; 514. Short connecting plate; 515. Long connecting plate; 516. Guide rod; 517. Arc push plate;

[0049] 52, supporting assembly; 521, supporting plate; 522, double-sided wedge block; 523, single-sided wedge block; 524, round rod; 525, limiting frame; 526, telescopic rod 2; 527, slide rail;

[0050] 6. Locking mechanism; 61. Straight plate; 62. Force wedge; 63. Force wedge; 64. Push-pull rod; 65. Fixed plate; 66. Fixed rod; 67. Slide plate; 68. Limiting column; 69. Rod body;

[0051] 7. Signal transmitter; 8. Contact switch; 81. Negative contact piece; 82. Positive contact piece; 9. Warning light. DETAILED DESCRIPTION

[0052] Example 1: Please refer to Figure 1-3 In an embodiment of the present invention, an online automatic switching device for a low-voltage frequency converter includes a control cabinet 1 and a frequency converter body 2 disposed inside the control cabinet 1. The frequency converter body 2 includes two frequency converter bodies, which are used to act as a main frequency converter and a sub-frequency converter in a low-voltage frequency converter system. The configuration of the two frequency converter bodies 2 enables the low-voltage frequency converter system to perform rapid automatic switching when an accident occurs, thereby ensuring the normal operation of the low-voltage frequency converter system.

[0053] An automatic switching component for switching between the main frequency converter and the auxiliary frequency converter is arranged inside the control cabinet 1. The automatic switching component is composed of a support base 4, a switching mechanism 5, a locking mechanism 6, a signal transmitter 7 and a contact switch 8. The signal transmitter 7 is electrically connected to the contact switch 8, and when the contact switch 8 is turned on, the closed-loop circuit formed by the signal transmitter 7 can activate the signal transmitter 7, thereby realizing the generation of the equipment fault signal, thereby facilitating the staff to understand the operating status of the equipment.

[0054] See also Figure 3-4 In the embodiment of the present invention, two control switches are installed on the support base 4 for connecting to the corresponding inverter body 2. The two control switches correspond to the inverter body 2 used to act as the main inverter and the auxiliary inverter respectively, and then the closing and closing of the two control switches realize the operation of different inverter bodies 2. The switching mechanism 5, the signal transmitter 7 and the contact switch 8 are all arranged on the support base 4. Among them, the switching mechanism 5 is used to switch and adjust multiple control switches. When the control switch of the main inverter is tripped by the switching mechanism 5, the control switch of the auxiliary inverter is pushed and closed synchronously, thereby completing the online automatic switching operation of the low-voltage inverter system.

[0055] See also Figure 3-4 In the embodiment of the present invention, the switching mechanism 5 is composed of a supporting assembly 51 and a supporting assembly 52. ​​The supporting assembly 52 includes two supporting assemblies 52, which are distributed corresponding to the corresponding control switches. The supporting assembly 51 is located below the supporting assembly 52 and is used to support the supporting assembly 52. ​​The supporting assembly 52 is located below the lever in the control switch and has no contact with the lever, so that when the control switch trips, it will not hinder the tripping movement of the lever in the control switch.

[0056] See also Figure 1-3In the embodiment of the present invention, the control cabinet 1 includes a cabinet 11, and a cabinet door 12 for opening and closing is installed at the front cabinet opening of the cabinet 11. A horizontal plate 13 is integrally arranged inside the cabinet 11 to separate the internal space of the cabinet 11. The space above the horizontal plate 13 is used as the main space for loading the inverter, and the space below the horizontal plate 13 is used as the auxiliary space for assembling the supporting structure. Among them, a partition 14 is fixedly connected to the top of the horizontal plate 13, and the two inverter bodies 2 are both installed on the top outer wall of the horizontal plate 13 and are located on both sides of the partition 14. The internal space of the cabinet 11 is separated by the arrangement of the horizontal plate 13, so as to facilitate the orderly assembly of the various structures in the low-voltage inverter system. The separation of the main space by the partition 14 makes it convenient for the staff to avoid contact with the running auxiliary inverter when the main inverter fails and needs to be repaired and maintained, thereby ensuring the safety of the maintenance personnel.

[0057] There are two notches on the back shell wall of the main space, corresponding to the corresponding inverter body 2. A cover plate is installed in the left notch by screws, and a back plate 3 is movably connected in the right notch. The back plate 3 is located behind the main inverter, which is convenient for opening when the main inverter fails, reducing the burden on maintenance personnel. An inspection port is opened on the back shell wall of the auxiliary space, and an inspection plate is screwed in the inspection port. An alarm light 9 for warning is installed on the top outer wall of the cabinet 11. The alarm light 9 is electrically connected to the contact switch 8, and is activated when the contact switch 8 forms a closed-loop circuit, which is used to warn the staff that there is a fault in the equipment and timely maintenance is required.

[0058] See also Figure 3-4 In the embodiment of the present invention, the back panel 3 includes a frame 31 rotatably connected to the notch on the right side by a pin shaft. A groove is provided on the back outer wall of the frame 31, and a shield 32 for covering is installed in the groove by screws. The arrangement of the shield 32 on the frame 31 enables the equipment to be conveniently disassembled during normal operation, which is convenient for the maintenance of the main inverter corresponding to the inside during operation. The front outer wall of the frame 31 is symmetrically provided with limit buckles 33 for limit locking, wherein the upper and lower parts of the frame 31 are both sleeved with torsion springs located on the pin shaft. The arrangement of the torsion spring enables the back panel 3 to open automatically without limit locking, which is convenient for the staff to maintain the inside of the cabinet 11.

[0059] See also Figure 8-12 In the embodiment of the present invention, the support seat 4 is composed of a bearing part and a vertical part, and its vertical section is an L-shaped structure. The control switch is mounted on the vertical part by screws, and a rectangular through slot is provided on the bearing part directly below the two control switches for the passage of cables.

[0060] The support assembly 51 includes a U-shaped plate 511 fixedly connected to the bearing part of the support seat 4 by screws. A front plate 512 is fixedly connected to the front shell wall of the U-shaped plate 511 by bolts. Among them, a guide groove is provided on the front inner wall of the U-shaped plate 511, and the U-shaped plate 511 and the front plate 512 together form a rectangular frame structure. The bottom of the rectangular frame structure is integrally provided with a bottom plate, and two folding frames 513 are movably connected inside the rectangular frame structure. The two folding frames 513 correspond to the two supporting assemblies 52 one by one. Then, the supporting assembly 52 located below the control switch in the auxiliary main inverter is moved upward by the transmission of the folding frame 513. A force storage member located on the bottom plate is provided between the two folding frames 513, and the force storage member assists the folding frame 513 on the left side. The force storage member is composed of a convex block, a movable plate and a force storage spring, wherein the convex block is fixedly connected to the top of the bottom plate, the movable plate is slidably connected to the bottom plate, and the convex block and the movable plate are connected by a force storage spring. The movable plate is threadedly connected with a positioning pin, so as to realize the limit locking of the movable plate. The configuration of the force storage member enables the folding frame 513 corresponding to the control switch in the auxiliary inverter to have a stronger driving force when another folding frame 513 is driven, so as to lift the corresponding supporting assembly 52 higher, thereby realizing the closing operation of the control switch in the auxiliary inverter.

[0061] The folding frame 513 includes two struts 5131 arranged in an interlaced manner. A U-shaped frame is fixedly connected to the top of the strut 5131, and a roller 5132 for contacting the supporting assembly 52 is installed in the U-shaped frame through a movable pin. The setting of the roller 5132 ensures stable top support for the supporting assembly 52 during the movement of the folding frame 513. The bottom end of the strut 5131 is movably connected to a roller for contacting the supporting bottom plate through a pin rod, and the rear end of the pin rod is slidably connected to the guide groove. The setting of the roller can not only reduce the power loss during the transmission between the two folding frames 513, but also provide bottom support for the folding frame 513, and ensure the stability of the folding frame 513 under the condition of the cooperation between the pin shaft and the guide groove.

[0062] The front ends of two adjacent pins are connected by a short connecting plate 514, and the front ends of the other two pins are connected by a long connecting plate 515. By setting the long connecting plate 515 and the short connecting plate 514, stable transmission between the two folding frames 513 is achieved. A return groove is provided on the front plate 512, and a protruding rod is movably connected in the return groove, and the rear end of the protruding rod is fixedly connected to the front outer wall of the long connecting plate 515. The configuration of the return groove and the protruding rod further ensures the stability of the folding frame 513.

[0063] A guide rod 516 for guiding support is movably connected to the right shell wall of the U-shaped plate 511. An arc-shaped push plate 517 is fixedly connected to the left side of the guide rod 516, and a return spring 1 located on the guide rod 516 is sleeved between the arc-shaped push plate 517 and the right inner wall of the U-shaped plate 511. The cooperation of the guide rod 516, the return-shaped push plate 517 and the return spring 1 allows the state of each folding frame 513 in the support assembly 51 to be adjusted when the main inverter is running, so that it can be used to synchronously realize the closing movement of the control switch in the auxiliary inverter when the control switch in the main inverter trips. The arc-shaped push plate 517 corresponds to the roller, and the roller close to it is pushed and adjusted under the drive of the return spring 1 and the guide rod 516. The elasticity of the return spring 1 is relatively small, and it can only ensure that the folding frame 513 is adjusted under no-load conditions, and will not cause adverse effects on the tripping of the control switch in the main inverter and the closing of the control switch in the auxiliary inverter.

[0064] The supporting assembly 52 includes a slide rail 527 arranged on both sides of the control switch. The slide rail 527 is fixedly connected to the vertical part in the support seat 4 by screws. A sliding sleeve is slidably connected to the slide rail 527, and a telescopic rod 526 for telescopic guidance is fixedly connected to the sliding sleeve. The output ends of the two telescopic rods 526 are commonly connected to a support plate 521, and the support plate 521 is located directly above the folding frame 513. A telescopic plate for limiting the force storage member is arranged on the bottom outer wall of the left support plate 521. When the control switch in the auxiliary inverter is in a tripped state, the bottom end of the telescopic plate blocks the moving plate in the force storage member, thereby ensuring the force storage effect of the force storage spring in the force storage member.

[0065] A cavity is provided on the bottom shell wall of the support plate 521, and a through hole is provided on the cavity shell wall of the cavity, in which a double-sided wedge 522 is movably connected. The inclined surfaces on both sides of the double-sided wedge 522 are slidably connected with a single-sided wedge 523, and a round rod 524 is fixedly connected to the side of the single-sided wedge 523 away from the double-sided wedge 522. The top of the single-sided wedge 523 is slidably connected to the top inner wall of the cavity. Multiple inclined surfaces of the double-sided wedge 522 are provided with T-slots, and the inclined surface of the single-sided wedge 523 is provided with a T-bar slidably connected to the T-slot, which is used to ensure the stability of the extrusion movement between the double-sided wedge 522 and the single-sided wedge 523.

[0066] The end of the round rod 524 away from the single-sided wedge block 523 passes through the corresponding side wall of the cavity, and a limit frame 525 for limiting the position of the second telescopic rod 526 is installed by screws. Among them, the round rod 524 is sleeved with a second return spring, one end of which is fixedly connected to the single-sided wedge block 523, and the other end of which is arranged on the corresponding inner wall of the cavity. The second telescopic rod 526 is composed of an outer tube and a core rod, wherein the end of the core rod away from the outer tube is fixedly connected to the support plate 521, and a plurality of limit openings are opened on the outer tube for inserting and limiting the limit frame 525.

[0067] See also Figure 3-4 In the embodiment of the present invention, the contact switch 8 includes a vertical plate fixedly connected to the bearing portion of the support seat 4, and a negative contact 81 is installed on the side wall of the vertical plate. A positive contact 82 located on the guide rod 516 is provided on the left side of the negative contact 81. The contact between the negative contact 81 and the positive contact 82 forms a closed loop circuit for activating the signal transmitter 7 and the alarm light 9.

[0068] See also Figure 3-7 In the embodiment of the present invention, the locking mechanism 6 includes a sleeve plate fixedly connected to the right shell wall of the partition 14. A push-pull rod 64 is movably connected to the sleeve plate, and a fixed plate 65 is fixedly connected to the front end of the push-pull rod 64. An inclined groove is provided on the fixed plate 65, and a rod body 69 is slidably connected in the inclined groove. The end of the rod body 69 away from the inclined groove is fixedly connected to the corresponding sliding sleeve. The rod body 69 moves synchronously with the up and down movement of the sliding sleeve, and the rod body 69 slides in the inclined groove, and then the fixed plate 65 is driven to adjust the forward and backward displacement with the movement of the rod body 69, so as to realize the forward and backward movement of the push-pull rod 64.

[0069] The rear end of the push-pull rod 64 is fixedly connected with a force-applying wedge 63, and the inclined surface of the force-applying wedge 63 is slidably connected with a force-bearing wedge 62. The inclined surface of the force-applying wedge 63 is provided with a T-shaped guide groove, and the inclined surface of the force-bearing wedge 62 is integrally provided with a T-shaped guide plate slidably connected to the T-shaped guide groove, thereby ensuring the stability of the mutual sliding between the two. A straight plate 61 is fixedly connected to the side wall of the force-bearing wedge 62, and a plurality of rectangular through grooves are provided on the straight plate 61. A fixed rod 66 is provided in each rectangular through groove, and a slide plate 67 is sleeved on the fixed rod 66, and the front and rear sides of the slide plate 67 are respectively slidably connected to the corresponding inner walls of the rectangular through groove. The top and bottom of the slide plate 67 are sleeved with a return spring three located on the fixed rod 66, and a limiting column 68 for limiting the back plate 3 is rotatably connected to the right shell wall of the slide plate 67. The limiting column 68 cooperates with the setting of the return spring three so that when the back panel 3 is closed, the limiting buckle 33 on the back panel 3 squeezes and applies force to the corresponding limiting column 68, thereby realizing the movement of the limiting column 68 with the slide plate 67, and further completing the locking between the limiting column 68 and the limiting buckle 33.

[0070] The working principle of the present invention is: when the equipment is assembled and used, when the main inverter in the low-voltage inverter system fails and causes the corresponding control switch to trip, the downward force generated by the tripping of the control switch lever acts on the supporting component 52 in the corresponding switching mechanism 5, causing it to move downward under force.

[0071] The supporting assembly 52 that moves downward due to the force exerts force on the corresponding folding frame 513 in the supporting assembly 51 below. The folding frame 513 that is subjected to the force performs an unfolded downward movement as the upper supporting assembly 52 moves downward. When the current folding frame 513 is forced to move downward, it exerts force on the arc-shaped push plate 517 that is in contact with it, causing it to move rightward, driving the guide rod 516 to move, and compressing the return spring 1.

[0072] When the current folding frame 513 moves, the short connecting plate 514 cooperates with the long connecting plate 515, thereby driving the other folding frame 513 to perform a folding movement. When the folding frame 513 is folded, the roller 5132 configured on the top thereof moves upward accordingly, thereby performing a supporting movement on the corresponding supporting assembly 52.

[0073] When the current supporting assembly 52 is forced to move upward, the telescopic plate arranged thereon is synchronously driven to move upward, and then the telescopic plate cancels the limit of the force storage member, so that the force storage member can be released, and then the corresponding lever in the control switch is driven to push upward with the help of the power released by the force storage member. The lever in the control switch is forced to move upward, and then the closing operation of the control switch is realized, thereby realizing the opening of the corresponding inverter body 2, completing the activation of the auxiliary inverter in the low-voltage inverter system, and thus ensuring the normal operation of the low-voltage inverter system.

[0074] When the guide rod 516 moves rightward, the positive contact 82 of the contact switch 8 mounted thereon contacts the negative contact 81, thereby completing the circuit closed-loop connection. The activation signal transmitter 7 and the alarm light 9 are thereby activated, and a fault signal is sent to the control center or the handheld terminal of the staff through the signal transmitter 7. The warning effect of the alarm light 9 after activation further enhances the warning effect for the staff.

[0075] The supporting assembly 52 driven by the tripped control switch synchronously drives the rod body 69 in the locking mechanism 6 to move downward synchronously during the downward movement. When the rod body 69 moves downward with the supporting assembly 52 in the inclined slot, the fixed plate 65 moves backward, thereby driving the push-pull rod 64 to move synchronously. When the push-pull rod 64 moves backward, it drives the force wedge 63 to move. The force wedge 63 is slidably connected with the force wedge 62, and then with the movement of the force wedge 63, the force wedge 62 is squeezed and forced, so that it drives the straight plate 61 to move leftward. When the straight plate 61 moves, the multiple limit posts 68 arranged thereon are adjusted to move leftward accordingly, and then each limit post 68 is separated from the corresponding limit buckle 33 arranged on the back plate 3.

[0076] After the limiting column 68 is separated from the limiting buckle 33, the back plate 3 is opened with the pin shaft as the rotation center due to the torsion spring arranged thereon, so that the staff can inspect and repair the corresponding inverter body 2 that has stopped running due to tripping.

[0077] When each inverter body 2 needs to be tested, it is necessary to manually open and close the corresponding control switches. Before manually adjusting each control switch, the corresponding supporting components 52 need to be adjusted to avoid hindering the movement of the lever in the control switch.

[0078] By pressing the double-sided wedge block 522 in the supporting assembly 52, and moving with it, the single-sided wedge blocks 523 connected thereto are pressed and squeezed, so that the single-sided wedge blocks 523 are displaced. The movement of the single-sided wedge block 523 drives the round rod 524 connected thereto to move, compressing the second reset spring. The movement of the round rod 524 drives the limit frame 525 connected thereto to move, and disengages from the limit of the corresponding telescopic rod 2 526. At this time, the support plate 521 can be pulled forward, and the telescopic rod 2 526 is stretched. When it moves to the maximum mileage, the squeezing of the single-sided wedge block 523 is released. At this time, under the action of the second reset spring, each limit frame 525 again limits and locks the corresponding telescopic rod 2 526. This makes it convenient for the staff to manually open and close each control switch.

[0079] After the manual operation of the control switch is completed, the above adjustment of the supporting assembly 52 is repeated again to reset it, thereby facilitating the subsequent automatic switching.

[0080] The use of the auxiliary inverter is a temporary transition. After the maintenance of the main inverter is completed, the operation of the main inverter is still the main one. At this time, the maintenance personnel need to manually adjust the support assembly 51 in the switching mechanism 5, manually reset the force storage member thereon, and then adjust the support assembly 52 corresponding to the control switch in the main inverter, and pull the support plate 521 thereon forward. Then turn off the control switch on the auxiliary inverter, and then close the control switch on the main inverter, so that the main inverter can operate normally, and finally reset the support assembly 52 corresponding to the control switch in the main inverter.

[0081] Example 2: Please refer to Fig.13In the embodiment of the present invention, the support seat 4 includes a base 41 fixedly connected to the top outer wall of the horizontal plate 13 by bolts. A notch is provided on the bearing portion of the base 41, and a carrier plate 42 is connected to the notch through a rotating shaft. Then, the carrier plate 42 can perform a flipping motion with the rotating shaft as the rotation center. The two sides of the notch are threadedly connected with fastening bolts located on the top shell wall of the bearing portion, and the bottom ends of the fastening bolts are fixedly connected to the carrier plate 42. 51 is set on the top outer wall of the carrier plate 42. The setting of the fastening bolts realizes the limit locking of the carrier plate 42.

[0082] The working principle of the present invention is: when the control switch arranged on the automatic switching component needs to be inspected and maintained, the support assembly 51 in the switching mechanism 5 loaded on the support seat 4 needs to be adjusted first to avoid obstruction to the loading and unloading of the control switch.

[0083] When the support assembly 51 needs to be adjusted, the force storage member loaded on the support assembly 51 is first locked and limited to prevent it from being dislocated, and then the telescopic plate loaded on the left supporting assembly 52 is adjusted to make its bottom end detach from the support assembly 51 below. Finally, the multiple fastening bolts on the base 41 are loosened, and then the carrier plate 42 in the support seat 4 is turned 90 degrees under the action of gravity, thereby driving the support assembly 51 to turn over and adjust, thereby canceling the support for the supporting assembly 52 and folding the control switch. The supporting assembly 52 moves downward by itself under the action of gravity without support, thereby further facilitating the loading and unloading operations of the control switch.

[0084] Example 3: Please refer to Figure 14-16 In the embodiment of the present invention, the folding frame 513 includes a telescopic rod 5133 and an end plate 5134. The telescopic rod 5133 is arranged in the U-shaped frame on the support rod 5131, and the output end of the telescopic rod 5133 passes through the front shell wall of the U-shaped frame. The end plate 5134 is fixedly connected to the output end of the telescopic rod 5133, and the top end of the end plate 5134 is slidably connected to the constraint groove provided on the bottom shell wall of the support plate 521. The sliding of the end plate 5134 in the constraint groove on the bottom shell wall of the support plate 521 not only ensures the movement of the folding frame 513 and the need for the forward and backward pulling adjustment of the support plate 521 in the support assembly 52, but also connects the support assembly 52 with the support assembly 51, so that the two become a whole, which is convenient for the overall flip adjustment of the carrier plate 42 when it is flipped and adjusted, so as to facilitate the loading and unloading maintenance of the control switch on the support seat 4. The end plate 5134 is composed of a disc and a protrusion, wherein the disc is fixedly connected to the output end of the telescopic rod 5133, and the protrusion is integrally arranged on the circumferential shell wall of the disc, and the top of the protrusion is a T-shaped structure, and the vertical section of the constraint groove is also a T-shaped structure, so that the protrusion of the end plate 5134 slides stably in the constraint groove.

[0085] The working principle of the present invention is: when the control switch arranged on the automatic switching component needs to be inspected and maintained, the switching mechanism 5 loaded on the support seat 4 needs to be adjusted first to avoid obstruction to the loading and unloading of the control switch.

[0086] When the switching mechanism 5 needs to be adjusted, the force storage member loaded on the support assembly 51 is first locked and limited to prevent it from dislocation, and then the telescopic plate loaded on the left supporting assembly 52 is adjusted to make its bottom end detach from the supporting assembly 51 below. Then, the slide rails 527 loaded on the base 41 in each supporting assembly 52 are disassembled, and the supporting assembly 52 in the switching mechanism 4 is integrated with the supporting assembly 51 after disassembly by means of the sliding connection between the end plate 5134 and the restraining groove on the supporting plate 521. Finally, the multiple fastening bolts on the base 41 are loosened, and then the supporting plate 42 in the supporting seat 4 is turned ninety degrees under the action of gravity, driving the switching mechanism 5 loaded thereon to turn ninety degrees as a whole, thereby eliminating the shielding of the control switch by the switching mechanism 5, and facilitating the subsequent loading and unloading and maintenance operations of the control switch.

[0087] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An online automatic switching device for a low-voltage frequency converter, comprising a control cabinet (1), and a frequency converter body (2) arranged inside the control cabinet (1), wherein: The inverter body (2) includes two inverters, which are used to act as a main inverter and a sub-inverter in a low-voltage inverter system, and is characterized in that an automatic switching component for switching between the main inverter and the sub-inverter is arranged inside the control cabinet (1), wherein the automatic switching component is composed of a support base (4), a switching mechanism (5), a locking mechanism (6), a signal transmitter (7) and a contact switch (8); A plurality of control switches are installed on the support base (4) for docking with the corresponding inverter body (2); the switching mechanism (5), the signal transmitter (7) and the contact switch (8) are all arranged on the support base (4); wherein the switching mechanism (5) is used to switch and adjust the plurality of control switches; The switching mechanism (5) is composed of a supporting component (51) and a supporting component (52), wherein the supporting component (52) includes two corresponding control switches, and the supporting component (51) is located below the supporting component (52) and is used to support the supporting component (52).

2. The online automatic switching device of a low voltage frequency converter according to claim 1, characterized in that: The control cabinet (1) comprises a cabinet (11), a cabinet door (12) for opening and closing is installed at the front cabinet opening of the cabinet (11), a horizontal plate (13) is integrally arranged inside the cabinet (11) for dividing the internal space of the cabinet (11), the space above the horizontal plate (13) is used as the main space for loading the inverter, and the space below the horizontal plate (13) is used as the auxiliary space for assembling the supporting structure, wherein a partition plate (14) is fixedly connected to the top of the horizontal plate (13), and the two inverter bodies (2) are both installed on the top outer wall of the horizontal plate (13) and located on both sides of the partition plate (14); Two notches are provided on the back shell wall of the main space, corresponding to the corresponding inverter main body (2) respectively; a cover plate is installed in the left notch by means of screws, and a back plate (3) is movably connected in the right notch; an inspection opening is provided on the back shell wall of the auxiliary space, and an inspection plate is installed in the inspection opening by means of screws; an alarm light (9) for warning is installed on the top outer wall of the cabinet (11).

3. The online automatic switching device of a low voltage frequency converter according to claim 2, characterized in that: The back plate (3) comprises a frame (31) rotatably connected to the right notch via a pin shaft, a groove is provided on the back outer wall of the frame (31), a shielding plate (32) for covering is installed in the groove via screws, and a limit buckle (33) for limit locking is symmetrically arranged on the front outer wall of the frame (31), wherein the upper and lower parts of the frame (31) are sleeved with a torsion spring located on the pin shaft.

4. The online automatic switching device of a low voltage frequency converter according to claim 1, characterized in that: The support seat (4) is composed of a bearing portion and a vertical portion, and its vertical cross section is an L-shaped structure; The support assembly (51) comprises a U-shaped plate (511) fixedly connected to the bearing part of the support seat (4) by screws, and a front plate (512) is fixedly connected to the front shell wall of the U-shaped plate (511) by bolts, wherein a guide groove is provided on the front inner wall of the U-shaped plate (511), and the U-shaped plate (511) and the front plate (512) together form a rectangular frame structure, a bottom plate is integrally provided at the bottom of the rectangular frame structure, and a plurality of folding frames (513) are movably connected inside the rectangular frame structure, the plurality of folding frames (513) correspond to the plurality of supporting assemblies (52) one by one, and a force storage member located on the bottom plate is provided between the plurality of folding frames (513), and the force storage member assists in applying force to the folding frame (513) on the left side.

5. The online automatic switching device of a low voltage frequency converter according to claim 4, characterized in that: The folding frame (513) comprises two support rods (5131) arranged in an interlaced manner, the top end of the support rod (5131) is fixedly connected to a U-shaped frame, a roller (5132) for contacting the supporting assembly (52) is installed in the U-shaped frame through a movable pin, the bottom end of the support rod (5131) is movably connected to a roller for contacting the bottom plate through a pin rod, and the rear end of the pin rod is slidably connected to the guide groove; The front ends of two adjacent pin rods are connected by a short connecting plate (514), and the front ends of the other two pin rods are connected by a long connecting plate (515). A return groove is provided on the front plate (512), a convex rod is movably connected in the return groove, and the rear end of the convex rod is fixedly connected to the front outer wall of the long connecting plate (515); A guide rod (516) for guiding support is movably connected to the right shell wall of the U-shaped plate (511), an arc-shaped push plate (517) is fixedly connected to the left side of the guide rod (516), and a return spring 1 located on the guide rod (516) is sleeved between the arc-shaped push plate (517) and the right inner wall of the U-shaped plate (511).

6. The online automatic switching device of a low voltage frequency converter according to claim 5, characterized in that: The supporting assembly (52) comprises a slide rail (527) arranged on both sides of the control switch, a slide sleeve is slidably connected to the slide rail (527), a telescopic rod (526) for telescopic guidance is fixedly connected to the slide sleeve, the output ends of the two telescopic rods (526) are commonly connected to a support plate (521), the support plate (521) is located directly above the folding frame (513), and a telescopic plate for limiting the force storage member is arranged on the bottom outer wall of the left support plate (521); A cavity is provided on the bottom shell wall of the support plate (521), and a through opening is provided on the cavity shell wall of the cavity, in which a double-sided wedge block (522) is movably connected, and single-sided wedge blocks (523) are slidably connected to the inclined surfaces on both sides of the double-sided wedge block (522), and a round rod (524) is fixedly connected to the side of the single-sided wedge block (523) away from the double-sided wedge block (522), and one end of the round rod (524) away from the single-sided wedge block (523) passes through the corresponding side walls of the cavity, and a limiting frame (525) for limiting the second telescopic rod (526) is installed by screws, wherein a second reset spring is sleeved on the round rod (524), one end of the second reset spring is fixedly connected to the single-sided wedge block (523), and the other end of the second reset spring is arranged on the corresponding inner wall of the cavity.

7. The online automatic switching device of a low voltage frequency converter according to claim 5, characterized in that: The contact switch (8) comprises a vertical plate fixedly connected to the bearing portion of the support seat (4), a negative contact piece (81) is mounted on the side wall of the vertical plate, a positive contact piece (82) located on the guide rod (516) is arranged on the left side of the negative contact piece (81), and the negative contact piece (81) and the positive contact piece (82) are attached to form a closed loop circuit for activating the signal transmitter (7) and the alarm light (9).

8. The online automatic switching device of a low voltage frequency converter according to claim 6, characterized in that: The locking mechanism (6) comprises a sleeve plate fixedly connected to the right shell wall of the partition (14), a push-pull rod (64) being movably connected to the sleeve plate, a front end of the push-pull rod (64) being fixedly connected to a fixing plate (65), an inclined groove being provided on the fixing plate (65), a rod body (69) being slidably connected in the inclined groove, and an end of the rod body (69) away from the inclined groove being fixedly connected to a corresponding sliding sleeve; The rear end of the push-pull rod (64) is fixedly connected to a force-applying wedge block (63), the inclined surface of the force-applying wedge block (63) is slidably connected to a force-bearing wedge block (62), the side wall of the force-bearing wedge block (62) is fixedly connected to a straight plate (61), a plurality of rectangular through grooves are provided on the straight plate (61), each of the rectangular through grooves is provided with a fixed rod (66), a slide plate (67) is sleeved on the fixed rod (66), the top and bottom of the slide plate (67) are sleeved with three return springs located on the fixed rod (66), and a limiting column (68) for limiting the back plate (3) is rotatably connected to the right shell wall of the slide plate (67).

9. The online automatic switching device of a low voltage frequency converter according to claim 4, characterized in that: The support seat (4) comprises a base (41) fixedly connected to the top outer wall of the horizontal plate (13) by bolts, a notch is provided on the bearing part of the base (41), a carrier plate (42) is connected in the notch by a rotating shaft, fastening bolts located on the top shell wall of the bearing part are threadedly connected on both sides of the notch, the bottom ends of the fastening bolts are fixedly connected to the carrier plate (42), and the (51) is arranged on the top outer wall of the carrier plate (42).

10. The online automatic switching device of a low voltage frequency converter according to claim 4, characterized in that: The folding frame (513) comprises a telescopic rod (5133) and an end plate (5134); the telescopic rod (5133) is arranged in a U-shaped frame on the support rod (5131); the output end of the telescopic rod (5133) passes through the front shell wall of the U-shaped frame; the end plate (5134) is fixedly connected to the output end of the telescopic rod (5133); and the top end of the end plate (5134) is slidably connected to a restraining groove provided on the bottom shell wall of the support plate (521).

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