Mine flameproof and intrinsically safe vacuum AC soft starter

Abstract

The present application discloses a flameproof and intrinsically safe vacuum AC soft starter for mining, comprising a main body, a wiring socket disposed on the top of the main body, and a cover for covering the opening at the top of the wiring socket. The wiring socket is provided with multiple groups of contact sockets; the wiring socket is provided with an anti-accidental touch protection mechanism, which includes an electromagnet, a clamping assembly, and a push button switch; the push button switch is connected in series to the power supply circuit of the contact socket, and the electromagnet and the clamping assembly are linked; when the electromagnet is energized, the electromagnet drives the clamping assembly to tighten; the push button switch is disposed on the clamping assembly, and the wiring socket is provided with a wire inlet, and the push button switch is located near the wire inlet. The present application greatly improves safety during wiring and provides multiple safety guarantees for workers.

Description

Technical Field

[0001] The present invention relates to the field of mine starters, in particular to a mine flameproof and intrinsically safe vacuum AC soft starter. Background Art

[0002] This explosion-proof and intrinsically safe vacuum high-voltage soft starter for mining is suitable for use in underground coal mines exposed to explosive gases (methane) and coal dust. It is primarily designed for soft starting and stopping high-voltage motors with rated three-phase AC voltages of 10kV and 6kV and rated currents of 50A, 75A, 150A, 200A, 300A, 400A, 500A, and 630A or less. As a main distribution switch or branch switch, this explosion-proof and intrinsically safe vacuum high-voltage soft starter for mining provides protection against undervoltage, overload, short circuit, leakage lockout, leakage current, and selective leakage current. It can be connected to an external remote shunt pushbutton to form a system.

[0003] The vacuum AC soft starter in the related art primarily comprises a housing, within which various electrical components for protection and control are installed. A terminal block is located at the top of the housing, within which are located several sets of contact blocks for connecting to external circuits. The contact blocks are electrically connected to the electrical components within the housing. A cover plate is located on the top of the terminal block to cover the opening of the terminal block. Wiring is accomplished by connecting the external circuit cable through the terminal block's input terminal, connecting the external circuit cable to the contact block, and then exiting the external circuit cable through the terminal block's output terminal. Finally, the exiting cable is connected to the motor, completing the installation of both.

[0004] Regarding the above-mentioned explosion-proof and intrinsically safe vacuum high-voltage soft starter for mining, the applicant believes that before performing wiring work, it is usually necessary to operate the vacuum AC soft starter to the open state first. When the wiring work is completed, the opening of the terminal block is covered with a cover plate. If an incorrect operation occurs during wiring and the vacuum AC soft starter is closed, the contact block after power is turned on will cause the workers to be in danger of electric shock. Summary of the Invention

[0005] In order to improve the problem that if the vacuum AC soft starter is closed due to improper operation during wiring, the energized contact seat will cause electric shock to the workers, the present application provides a mine-use explosion-proof and intrinsically safe vacuum AC soft starter.

[0006] A mine-use explosion-proof and intrinsically safe vacuum AC soft starter comprises a main body, a wiring seat is provided on the top of the main body, and a cover for covering the opening on the top of the wiring seat, wherein multiple groups of contact seats are provided in the wiring seat; an anti-accidental touch protection mechanism is provided in the wiring seat, and the anti-accidental touch protection mechanism comprises an electromagnet, a clamping assembly and a push button switch; the push button switch is connected in series to the power supply circuit of the contact seat, and the electromagnet is linked to the clamping assembly; when the electromagnet is energized, the electromagnet drives the clamping assembly to tighten; the push button switch is arranged on the clamping assembly, and a wire inlet is provided on the wiring seat, and the push button switch is close to the wire inlet.

[0007] By adopting the above technical solution, the electromagnet is kept in a de-energized state before wiring, and the clamping assembly is in a relaxed state at this time; since the push button switch is connected in series in the power supply circuit of the contact holder, if the power supply circuit of the contact holder needs to be connected, the push button switch must be triggered and kept in the on state; at this time, if an incorrect operation occurs and the main body is closed, since the push button switch is not triggered, the power supply circuit of the contact holder is always in a disconnected state, ensuring the wiring safety of the staff; when the staff completes the wiring work, the electromagnet is energized first. After energization, the electromagnet will drive the clamping assembly to tighten. As the clamping assembly is tightened, the push button switch will contact the cable in the line inlet, and the push button switch can now turn on the power supply circuit of the contact holder; thereby greatly improving the safety during wiring and providing multiple safety guarantees for the staff.

[0008] Optionally, the clamping assembly includes a first clamping plate and a second clamping plate that are arranged opposite to each other, and the first clamping plate and the second clamping plate are located on both sides of the wire inlet; the first clamping plate is arranged on the terminal block, and the second clamping plate is provided with a sliding rod, and the sliding rod is movably passed through the first clamping plate; the movable end of the electromagnet is linked to the sliding rod.

[0009] By adopting the above technical solution, when the electromagnet is energized, the movable end of the electromagnet will drive the second clamping plate to move toward the first clamping plate through the sliding rod, and finally the first clamping plate and the second clamping plate will clamp and fix the cable in the cable inlet, thereby enhancing the stability and reliability of the cable in the cable inlet, and making the connection between the cable and the terminal block less likely to break due to external force; when the electromagnet is de-energized, the movable end of the electromagnet will reset, and at this time the first clamping plate and the second clamping plate will separate from each other.

[0010] Optionally, a reset spring for resetting the second clamping plate is sleeved on the slide bar, one end of the reset spring abuts against the side wall of the first clamping plate facing away from the second clamping plate, and the other end of the reset spring is connected to the slide bar.

[0011] By adopting the above technical solution, when the second clamping plate moves toward the first clamping plate under the drive of the electromagnet, the reset spring will be gradually compressed; when the electromagnet is powered off, the second clamping plate will be reset under the action of the reset spring; under the action of the reset spring, the first clamping plate and the second clamping plate are smoothly separated. When the first clamping plate and the second clamping plate are separated, the push button switch will also be separated from the cable. As the push button switch is separated, the power supply circuit of the contact holder will also be disconnected, thereby ensuring safety during wiring removal and maintenance.

[0012] Optionally, the cover is provided with a limit plate extending into the terminal block, and the limit plate is in contact with the inner wall of the terminal block; the limit plate is penetrated by a through hole for inserting the movable end of the power supply magnet; the insertion direction of the movable end of the electromagnet is perpendicular to the direction in which the limit plate is inserted into the terminal block.

[0013] By adopting the above technical solution, when the cover covers the upper opening of the terminal block, the limit plate will extend into the limit plate, and when the cover is installed in place, the through hole on the limit plate will be aligned with the movable end of the electromagnet; after the electromagnet is energized, the movable end of the electromagnet will be inserted into the through hole, and at this time the cover can be limited by the action of the electromagnet, thereby locking the cover; the cover can only be opened after the electromagnet is powered off, thereby effectively preventing the cover from being opened when the contact block is energized, and further enhancing the anti-electric shock protection effect.

[0014] Optionally, a first cover plate close to the wire inlet is rotatably provided on the first clamping plate, and a second cover plate also close to the wire inlet is rotatably provided on the second clamping plate; torsion springs are provided on the rotating axes of the first cover plate and the second cover plate, and the first cover and the second cover plate cover the adjacent wire inlets under the action of the torsion springs.

[0015] By adopting the above technical solution, when the cable is inserted into the terminal block from the cable inlet, the cable will push the first cover plate and the second cover plate to open in the direction of separation from each other, and the cable can be smoothly inserted into the terminal block; when the cable is pulled out from the cable inlet, the first cover plate and the second cover plate will be reset under the action of the torsion spring and cover the cable inlet; by covering the cable inlet, the dust under the mine can be reduced from entering the terminal block through the cable inlet, thereby achieving a dust-proof effect; when the first cover plate and the second cover plate cover the cable inlet, if the electromagnet is energized due to careless operation, the first cover plate and the second cover plate can limit the tightening of the first clamping plate and the second clamping plate, thereby preventing hands from being pinched.

[0016] Optionally, the button switch is close to the second cover plate, and the button switch is located on the rotation path of the second cover plate.

[0017] By adopting the above technical solution, when the cable is inserted into the terminal block from the cable inlet, the second cover plate will rotate toward the direction close to the button switch; since the electromagnet is in the power-off state at this time, there is a large gap between the second clamping plate and the first clamping plate. At this time, it is difficult for the second cover plate to contact the button switch when rotating, thereby further ensuring that the power supply circuit of the contact block remains disconnected during wiring; only when the electromagnet is energized and the second clamping plate is tightened toward the direction close to the first clamping plate, the second clamping plate will drive the second cover plate to rotate in the direction closer to the button switch, and finally the second cover plate can successfully trigger the button switch.

[0018] Optionally, a magnet is provided on the side wall of the first cover plate facing away from the line inlet, and the magnet is used to be attracted to the first clamping plate.

[0019] By adopting the above technical solution, when the magnet rotates with the first cover plate until it is attracted to the first clamping plate, the first cover plate can be fixed to the first clamping plate; at this time, if the cable needs to be taken out from the cable inlet, since the first cover plate is in an open state at this time, it is convenient for the staff to smoothly take the cable out of the cable inlet; when taking out the cable, it is prevented from being stuck due to being clamped by the first cover plate and the second cover plate.

[0020] Optionally, a driving frame is provided at the movable end of the electromagnet, and the driving frame is located between adjacent clamping assemblies, and the driving frame is used to drive the adjacent clamping assemblies to move synchronously.

[0021] By adopting the above technical solution, when the electromagnet is energized, the drive frame can realize the synchronous movement of two adjacent clamping assemblies. One set of electromagnets can control the movement of the two sets of clamping assemblies, saving electric energy.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] If an incorrect operation occurs and the main body is closed, the push button switch is not triggered, thereby ensuring that the power supply circuit of the contact holder is always in a disconnected state, ensuring the wiring safety of the staff; greatly improving the safety during wiring and providing multiple safety guarantees for the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0025] Figure 2 yes Figure 1 Schematic diagram of the local structure explosion.

[0026] Figure 3 yes Figure 1 Schematic diagram of the local structure behind the hidden cover.

[0027] Figure 4 yes Figure 3 The figure shows the partial structure diagram of the protection mechanism against accidental touch.

[0028] Figure 5 yes Figure 4 The figure shows a schematic diagram of the local structure of the clamping component.

[0029] Description of reference numerals:

[0030] 1. Main body; 2. Terminal block; 21. Wire inlet; 3. Cover; 31. Limit plate; 311. Perforation; 4. Contact holder; 5. Anti-accidental touch protection mechanism; 51. Electromagnet; 52. Clamping assembly; 521. First clamping plate; 5211. First cover plate; 522. Second clamping plate; 5221. Second cover plate; 523. Slide rod; 5231. Mounting plate; 524. Return spring; 525. Torsion spring; 53. Push button switch; 54. Magnet; 55. Drive frame. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-5 This application is described in further detail.

[0032] The embodiment of the present application discloses a mine flameproof and intrinsically safe vacuum AC soft starter. Figure 1 、 Figure 2 The flameproof and intrinsically safe vacuum AC soft starter for mining includes a main body 1, with a terminal block 2 disposed on top. Within this block are multiple contact blocks 4 for connecting to the electrical components within the main body 1. A cover 3, securing the top opening of the terminal block 2 with bolts, is integrally formed with two opposing limit plates 31. The lower ends of the limit plates 31 extend into the terminal block 2 and engage the inner wall of the terminal block 2.

[0033] like Figure 3 、 Figure 4 As shown, the terminal block 2 is provided with two groups of wire inlets 21, which are arranged opposite to each other, and the number of wire inlets 21 in each group is two, and the two wire inlets 21 in the same group are arranged on the same inner wall of the terminal block 2. The terminal block 2 is provided with an anti-accidental touch protection mechanism 5 near the wire inlet 21. The anti-accidental touch protection mechanism 5 includes an electromagnet 51 located between the two groups of wire inlets 21. The type of electromagnet 51 used in this embodiment is a push-pull type. When the electromagnet 51 is energized, the movable end of the electromagnet 51 will remain in an extended state. When the electromagnet 51 is de-energized, its movable end will retract. In this embodiment, the number of electromagnets 51 is two groups, and the movable ends of the two groups of electromagnets 51 are arranged back to back.

[0034] like Figure 3 、 Figure 4As shown, a drive frame 55 is fixedly mounted on the movable end of each set of electromagnets 51. The movable ends of the electromagnets 51 extend from the drive frame 55 and face their respective opposing stop plates 31. The stop plates 31 are provided with through-holes 311, each of which faces its respective opposing movable end. When the electromagnets 51 are energized, the movable ends of the electromagnets 51 are inserted into their respective opposing through-holes 311. The insertion direction of the movable ends of the electromagnets 51 is perpendicular to the direction in which the stop plates 31 are inserted into the terminal block 2.

[0035] like Figure 3 、 Figure 4 As shown, the anti-accidental touch protection mechanism 5 also includes four groups of clamping assemblies 52 respectively close to the adjacent wire inlets 21, and each group of clamping assemblies 52 includes a first clamping plate 521 and a second clamping plate 522 arranged opposite to each other. The first clamping plate 521 and the second clamping plate 522 located on the same group of clamping assemblies 52 are respectively located on both sides of their respective through-holes 311. The first clamping plate 521 is fixedly mounted on the inner side wall of the terminal block 2, and the second clamping plate 522 is fixedly mounted with four slide bars 523 passing through the first clamping plate 521 of the same group. The second clamping plate 522 is movable relative to the first clamping plate 521 respectively through the slide bars 523. The slide bars 523 that pass through the first clamping plate 521 are fixedly mounted on the same mounting plate 5231. The ends of the drive frame 55 extend in the direction close to the adjacent mounting plates 5231, and the ends of the drive frame 55 extend between the mounting plate 5231 and the first clamping plate 521.

[0036] like Figure 3 、 Figure 4 As shown, each slide bar 523 is provided with a return spring 524 positioned between the mounting plate 5231 and the first clamping plate 521. The return spring 524 is used to move the mounting plate 5231 toward the adjacent first clamping plate 521. The return spring 524 extends and contracts along the length of the slide bar 523. One end of the return spring 524 is connected to the mounting plate 5231, and the other end is connected to the first clamping plate 521. When the electromagnet 51 is energized, the drive frame 55 drives the mounting plates 5231 on both sides to move synchronously away from their respective first clamping plates 521. At this time, the second clamping plates 522, driven by the slide bar 523, move toward their respective first clamping plates 521, thereby tightening the clamping assembly 52.

[0037] like Figure 3 、 Figure 4As shown, a first cover plate 5211 is rotatably mounted on the first clamping plate 521, positioned near the cable inlet 21. A second cover plate 5221 is rotatably mounted on the second clamping plate 522, also positioned near the cable inlet 21. The first cover plate 5211 and the second cover plate 5221, located on the same clamping assembly 52, rotate about their respective rotation axes toward or away from each other. Torsion springs 525 are mounted on the rotation axes of the first and second cover plates 5211, 5221. The elastic force of the respective torsion springs 525 causes the first and second cover plates 5211, 5221 to rotate toward each other. Furthermore, the first and second cover plates 5211, 5221 are used to cover the cable inlet 21.

[0038] like Figure 4 、 Figure 5 As shown, a magnet 54 is fixedly mounted on the side wall of the first cover 5211 facing away from the cable inlet 21, and the first clamping plate 521 is made of an iron material that can be attracted by the magnet 54. When a cable is inserted into the terminal block 2 through the cable inlet 21, the first cover 5211 and the second cover 5221 will open in a direction away from each other under the push of the cable. At this time, the magnet 54 on the first cover 5211 will move toward the first clamping plate 521. When the magnet 54 and the first clamping plate 521 are attracted, the first cover 5211 will be fixed to the first clamping plate 521.

[0039] like Figure 3 、 Figure 4 、 Figure 5 As shown, the accidental touch protection mechanism 5 also includes a push button switch 53 connected in series with the power supply circuit of the contact base 4. The push button switch 53 is a normally open push button switch. When the push button switch 53 is kept pressed, the power supply circuit of the contact base 4 is connected. The push button switch 53 is mounted on the side wall of the second clamping plate 522 near the cable inlet 21 and is located in the rotation path of the second cover plate 5221.

[0040] like Figure 4 、 Figure 5 As shown, when the first cover plate 5211 and the second cover plate 5221 are opened in a direction away from each other under the push of the cable, since the electromagnet 51 is in an off-state at this time, there is still a large gap between the second clamping plate 522 and the first clamping plate 521. At this time, the second cover plate 5221 still has difficulty contacting the push button switch 53 during rotation, thereby ensuring that the power supply circuit of the contact holder 4 remains disconnected during wiring. Only when the electromagnet 51 is energized and the second clamping plate 522 is tightened in a direction closer to the first clamping plate 521, the second clamping plate 522 will drive the second cover plate 5221 to rotate in a direction closer to the push button switch 53, and finally the second cover plate 5221 can successfully trigger the push button switch 53 and keep the push button switch 53 in the triggered state.

[0041] like Figure 4 、 Figure 5 As shown, when the first cover plate 5211 and the second cover plate 5221 cover the wire inlet 21, if the electromagnet 51 is energized due to careless operation, the first cover plate 5211 and the second cover plate 5221 can limit the tightening of the first clamping plate 521 and the second clamping plate 522, thereby preventing the hand from being pinched.

[0042] The implementation principle of a mine-use explosion-proof and intrinsically safe vacuum AC soft starter according to the embodiment of the present application is as follows:

[0043] Before wiring, the electromagnet 51 is kept in a de-energized state, and the clamping assembly 52 is in a relaxed state. Since the button switch 53 is connected in series to the power supply circuit of the contact base 4, if the power supply circuit of the contact base 4 needs to be connected, the button switch 53 must be triggered and kept in the on state. At this time, if an inadvertent operation occurs and the main body 1 is closed, since the button switch 53 is not triggered, the power supply circuit of the contact base 4 is always in the off state, ensuring the wiring safety of the staff. When the staff completes the wiring work, they first energize the electromagnet 51. At this time, the second clamping plate 522 will tighten in the direction close to the first clamping plate 521, and then the second clamping plate 522 will drive the second cover plate 5221 to rotate in the direction closer to the button switch 53. Finally, the second cover plate 5221 can successfully trigger the button switch 53 and keep the button switch 53 in the triggered state; thereby greatly improving the safety during wiring and providing multiple safety guarantees for the staff.

[0044] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A mine flameproof and intrinsically safe vacuum AC soft starter, comprising a body (1), a wiring seat (2) provided on the top of the body (1), and a cover (3) for covering the top opening of the wiring seat (2), wherein a plurality of contact seats (4) are provided in the wiring seat (2); the characteristics include: An anti-accidental touch protection mechanism (5) is provided in the wiring base (2), and the anti-accidental touch protection mechanism (5) includes an electromagnet (51), a clamping assembly (52) and a button switch (53); the button switch (53) is connected in series to the power supply circuit of the contact base (4), and the electromagnet (51) and the clamping assembly (52) are linked; when the electromagnet (51) is energized, the electromagnet (51) drives the clamping assembly (52) to tighten; the button switch (53) is provided on the clamping assembly (52), and a wire inlet (21) is provided on the wiring base (2), and the button switch (53) is close to the wire inlet (21); The clamping assembly (52) includes a first clamping plate (521) and a second clamping plate (522) that are arranged opposite to each other, wherein the first clamping plate (521) and the second clamping plate (522) are located on both sides of the line inlet (21); the first clamping plate (521) is arranged on the wiring seat (2), and the second clamping plate (522) is provided with a slide bar (523), and the slide bar (523) is movably arranged on the first clamping plate (521); the movable end of the electromagnet (51) is linked to the slide bar (523); A first cover plate (5211) close to the wire inlet (21) is rotatably provided on the first clamping plate (521), and a second cover plate (5221) also close to the wire inlet (21) is rotatably provided on the second clamping plate (522); a torsion spring (525) is provided on the rotation axis of each of the first cover plate (5211) and the second cover plate (5221), and the first cover plate (5211) and the second cover plate (5221) cover the adjacent wire inlet (21) under the action of the torsion spring (525); The button switch (53) is close to the second cover plate (5221), and the button switch (53) is located on the rotation path of the second cover plate (5221).

2. The explosion-proof and intrinsically safe vacuum AC soft starter for mining according to claim 1 is characterized in that: A return spring (524) is sleeved on the slide bar (523) for returning the second clamping plate (522). One end of the return spring (524) contacts the side wall of the first clamping plate (521) away from the second clamping plate (522), and the other end of the return spring (524) is connected to the slide bar (523).

3. The explosion-proof and intrinsically safe vacuum AC soft starter for mining according to claim 1 is characterized in that: The cover (3) is provided with a limiting plate (31) extending into the wiring base (2), and the limiting plate (31) is in contact with the inner wall of the wiring base (2); the limiting plate (31) is penetrated by a through hole (311) for inserting the movable end of the power supply magnet (51); the insertion direction of the movable end of the electromagnet (51) is perpendicular to the direction in which the limiting plate (31) is inserted into the wiring base (2).

4. The explosion-proof and intrinsically safe vacuum AC soft starter for mining according to claim 1 is characterized in that: A magnet (54) is provided on the side wall of the first cover plate (5211) facing away from the line inlet (21), and the magnet (54) is used to attract the first clamping plate (521).

5. The explosion-proof and intrinsically safe vacuum AC soft starter for mining according to claim 1 is characterized in that: A driving frame (55) is provided at the movable end of the electromagnet (51), and the driving frame (55) is located between adjacent clamping assemblies (52). The driving frame (55) is used to drive the adjacent clamping assemblies (52) to move synchronously.

Images