阅读说明：本技术 驱动齿条锁紧装置 (Driving rack locking device ) 是由 刘书秀 吴铁 冯忠海 董世财 李喜明 吴坤 候彦峥 刘运承 于 2021-11-11 设计创作，主要内容包括：本申请涉及安全棒驱动机构领域,尤其是涉及一种驱动齿条锁紧装置。驱动齿条锁紧装置包括保持件、顶紧件和驱动组件,驱动齿条的外侧壁上开设有锁紧槽,顶紧件通过保持件活动设置于驱动齿条的径向方向的一侧,且顶紧件能够在保持件上沿驱动齿条的径向方向移动。驱动齿条能够移动至锁紧槽与顶紧件相正对,驱动组件的活动端能够推动顶紧件使顶紧件朝向驱动齿条的一端伸出保持件并伸入驱动齿条的锁紧槽内与驱动齿条的外侧壁相抵靠,从而使顶紧件的一部分位于保持件内,顶紧件的另一部分伸入驱动齿条的锁紧槽内,且顶紧件的两端分别与驱动组件的活动端和驱动齿条的外侧壁相抵靠,进而对驱动齿条进行轴向锁止,使驱动齿条无法沿自身的轴线方向运动。(The application relates to the field of safety rod driving mechanisms, in particular to a driving rack locking device. The driving rack locking device comprises a retaining piece, a jacking piece and a driving assembly, a locking groove is formed in the outer side wall of the driving rack, the jacking piece is movably arranged on one side of the radial direction of the driving rack through the retaining piece, and the jacking piece can move on the retaining piece along the radial direction of the driving rack. The drive rack can move to the locking groove just right with top tight piece mutually, drive assembly's expansion end can promote top tight piece and make the one end of top tight piece orientation drive rack stretch out the holding piece and stretch into the locking inslot of drive rack and lean on with the lateral wall counterbalance of drive rack, thereby make a part of top tight piece be located the holding piece, another part of top tight piece stretches into the locking inslot of drive rack, and the both ends of top tight piece lean on with drive assembly's expansion end and drive rack's lateral wall counterbalance respectively, and then carry out axial locking to the drive rack, make the unable axis direction motion of following self of drive rack.)

1. A locking device of a driving rack is used for locking the driving rack of a safety rod driving mechanism; the locking device is characterized by comprising a holding piece, a top fastening piece and a driving assembly;

the holding piece is arranged on one side of the driving rack in the length direction, and the tightening piece is movably arranged on the holding piece;

a locking groove is formed in the outer side wall of one end, facing the holding piece, of the driving rack, and the driving rack can move to a position where the locking groove is opposite to the jacking piece;

the movable end of the driving assembly can drive the tightening piece to move, so that a part of the tightening piece extends into the locking groove to lock the driving rack.

2. The drive rack locking apparatus according to claim 1 wherein said retaining member is a retaining sleeve open at one end, said retaining sleeve being disposed coaxially with said drive rack with the open end of said retaining sleeve facing said drive rack so that one end of said drive rack can extend into said retaining sleeve;

the side wall of the retaining sleeve is provided with a limiting through hole, the top member is movably arranged in the limiting through hole, and the driving assembly can drive the top member to move along the radial direction of the retaining sleeve so that part of the top member extends into the retaining sleeve.

3. The drive rack locking apparatus of claim 2 wherein said top member is a ball bearing.

4. The drive rack locking device of claim 2 wherein said locking groove is disposed circumferentially around said drive rack;

the quantity of spacing through-hole is a plurality of, and is a plurality of spacing through-hole is in be circumference interval distribution on the holding sleeve, and every all be provided with in the spacing through-hole top tight piece to it is right through a plurality of top tight piece drive rack carries out the kayser.

5. The drive rack locking device of claim 2 wherein said drive assembly comprises a stationary core, a movable core and a solenoid;

the static iron core and the movable iron core are oppositely sleeved on the retaining sleeve at intervals, and the inner wall of the movable iron core is abutted against the jacking piece;

the electromagnetic coil is arranged around the static iron core and the movable iron core and is used for being electrically connected with a power supply;

when the electromagnetic coil is electrified, electromagnetic force can be formed between the static iron core and the movable iron core, so that the movable iron core moves from a first station far away from the static iron core to a second station against the static iron core, and the pushing piece is pushed to move towards the inside of the retaining sleeve, so that part of the pushing piece extends into the retaining sleeve.

6. The locking device for the driving rack according to claim 5, wherein an abdicating groove is formed on the inner side wall of the movable iron core around the movable iron core, and the side wall surface of one side of the abdicating groove, which is far away from the static iron core, is an inclined surface;

when the movable iron core is positioned at the first station, a part of the top piece can extend into the abdicating groove so that the top piece can be completely withdrawn from the holding sleeve;

when move the iron core and be located during the second station, move the iron core and pass through the inside wall of abdicating the groove outside with the tight piece counterbalance of top leans on, so that a part of the tight piece of top stretches into in the holding sleeve.

7. The drive rack locking device of claim 5 wherein said drive assembly further comprises a first resilient member;

the two ends of the first elastic piece are respectively abutted against the static iron core and the movable iron core, and the elastic force of the first elastic piece can drive the movable iron core to move towards the direction away from the static iron core.

8. The drive rack locking apparatus of claim 5 further comprising a hold-down circuit through which said solenoid is electrically connected to said power source.

9. The drive rack locking device of claim 2 further comprising a stop assembly;

the stop assembly comprises a stop sleeve and a second elastic piece;

the stopping sleeve is arranged in the retaining sleeve, and the closed end of the stopping sleeve faces the driving rack;

one end of the second elastic piece abuts against the closed end of the retaining sleeve, and the other end of the second elastic piece extends into the stopping sleeve through the open end of the stopping sleeve and abuts against the closed end of the stopping sleeve;

the elastic force of the second elastic piece can drive the retaining sleeve to move towards the driving rack until the side wall of the retaining sleeve is opposite to the limiting through hole.

10. The drive rack locking apparatus of claim 2 further comprising a radiation shield housing;

the anti-radiation outer shell cover is arranged on the outer sides of the retaining sleeve and the driving assembly, and the anti-radiation outer shell is used for being connected with the outer shell of the safety rod driving mechanism, and enables the open end of the retaining sleeve to be exposed towards the driving rack.

Technical Field

The application relates to the field of safety rod driving mechanisms, in particular to a driving rack locking device.

Background

The safety rod driving mechanism is a key device in the reactor and is used for being connected with the safety rod, when the reactor normally operates, the safety rod driving mechanism can ensure that the safety rod is suspended above the reactor core of the reactor, and when the reactor needs to be shut down, the safety rod driving mechanism can release the safety rod to enable the safety rod to be rapidly inserted into the reactor core, so that emergency shutdown is realized. The driving rack is a key component of the safety rod driving mechanism for controlling the state of the safety rod, and the safety rod is released through the movement of the driving rack so as to be used for stopping the reactor, so that the driving rack needs to be locked when the reactor normally runs, and the safety rod can stably hover above the reactor.

Disclosure of Invention

The invention aims to provide a driving rack locking device which can lock a driving rack of a safety rod driving mechanism when a reactor normally operates.

The invention provides a driving rack locking device which is used for locking a driving rack of a safety rod driving mechanism; the driving rack locking device comprises a holding piece, a jacking piece and a driving assembly;

the holding piece is arranged on one side of the driving rack in the length direction, and the tightening piece is movably arranged on the holding piece;

a locking groove is formed in the outer side wall of one end, facing the holding piece, of the driving rack, and the driving rack can move to a position where the locking groove is opposite to the jacking piece;

the movable end of the driving assembly can drive the tightening piece to move, so that a part of the tightening piece extends into the locking groove to lock the driving rack.

Further, the holding piece is a holding sleeve with one open end, the holding sleeve is arranged coaxially with the driving rack, and the open end of the holding sleeve faces the driving rack, so that one end of the driving rack can extend into the holding sleeve;

the side wall of the retaining sleeve is provided with a limiting through hole, the top member is movably arranged in the limiting through hole, and the driving assembly can drive the top member to move along the radial direction of the retaining sleeve so that part of the top member extends into the retaining sleeve.

Further, the top member is a ball.

Further, the locking groove is arranged around the circumferential direction of the driving rack;

the quantity of spacing through-hole is a plurality of, and is a plurality of spacing through-hole is in be circumference interval distribution on the holding sleeve, and every all be provided with in the spacing through-hole top tight piece to it is right through a plurality of top tight piece drive rack carries out the kayser.

Further, the driving assembly comprises a static iron core, a movable iron core and an electromagnetic coil;

the static iron core and the movable iron core are oppositely sleeved on the retaining sleeve at intervals, and the inner wall of the movable iron core is abutted against the jacking piece;

the electromagnetic coil is arranged around the static iron core and the movable iron core and is used for being electrically connected with a power supply;

when the electromagnetic coil is electrified, electromagnetic force can be formed between the static iron core and the movable iron core, so that the movable iron core moves from a first station far away from the static iron core to a second station against the static iron core, and the pushing piece is pushed to move towards the inside of the retaining sleeve, so that part of the pushing piece extends into the retaining sleeve.

Furthermore, a yielding groove is formed in the inner side wall of the movable iron core in a surrounding mode, and the side wall surface of the yielding groove, which is far away from one side of the static iron core, is an inclined surface;

when the movable iron core is positioned at the first station, a part of the top piece can extend into the abdicating groove so that the top piece can be completely withdrawn from the holding sleeve;

when move the iron core and be located during the second station, move the iron core and pass through the inside wall of abdicating the groove outside with the tight piece counterbalance of top leans on, so that a part of the tight piece of top stretches into in the holding sleeve.

Further, the driving assembly further comprises a first elastic piece; the two ends of the first elastic piece are respectively abutted against the static iron core and the movable iron core, and the elastic force of the first elastic piece can drive the movable iron core to move towards the direction away from the static iron core.

Furthermore, the driving rack locking device also comprises a holding-down circuit, and the electromagnetic coil is electrically connected with the power supply through the holding-down circuit.

Further, the driving rack locking device also comprises a stop component;

the stop assembly comprises a stop sleeve and a second elastic piece; the stopping sleeve is arranged in the retaining sleeve, and the closed end of the stopping sleeve faces the driving rack;

one end of the second elastic piece abuts against the closed end of the retaining sleeve, and the other end of the second elastic piece extends into the stopping sleeve through the open end of the stopping sleeve and abuts against the closed end of the stopping sleeve;

the elastic force of the second elastic piece can drive the retaining sleeve to move towards the driving rack until the side wall of the retaining sleeve is opposite to the limiting through hole.

Further, the radiation-proof shell is further included;

the anti-radiation outer shell cover is arranged on the outer sides of the retaining sleeve and the driving assembly, and the anti-radiation outer shell is used for being connected with the outer shell of the safety rod driving mechanism, and enables the open end of the retaining sleeve to be exposed towards the driving rack.

Compared with the prior art, the invention has the beneficial effects that:

the driving rack locking device comprises a retaining piece, a jacking piece and a driving assembly, wherein a locking groove is formed in the outer side wall of one end of the driving rack in the length direction, the retaining piece is arranged close to the end part, provided with the locking groove, of the driving rack, the jacking piece is movably arranged on the retaining piece, so that the jacking piece is located on one side of the driving rack in the radial direction, and the jacking piece can move on the retaining piece in the radial direction of the driving rack. When the reactor normally runs, the driving rack stays at a preset position, and the locking groove on the outer side wall of the driving rack is opposite to the jacking piece. The expansion end of drive assembly can with push up the tight one end of keeping away from the drive rack of piece and offset and lean on, and the motion of the expansion end of piece is got in the drive can promote a tight piece, make the tight piece in top stretch out the holding piece and stretch into the locking inslot of drive rack and lean on with the lateral wall counterbalance of drive rack, thereby make a part of a tight piece in top be located the holding piece, another part of a tight piece in top stretches into the locking inslot of drive rack, and the both ends of a tight piece in top lean on with the expansion end of drive assembly and the lateral wall counterbalance of drive rack respectively, and then carry out the axial locking to the drive rack through a tight piece, make the drive rack can't follow the axis direction motion of self.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a driving rack locking device provided in an embodiment of the present invention in a locked state;

fig. 2 is a schematic structural diagram of the driving rack locking device provided in the embodiment of the present invention in an unlocked state.

Reference numerals:

1-driving rack, 11-locking groove, 2-holding sleeve, 21-tightening piece, 22-step part, 3-static iron core, 4-movable iron core, 41-abdicating groove, 42-inclined surface, 5-first elastic piece, 6-electromagnetic coil, 7-stopping sleeve, 71-boss part, 8-second elastic piece and 9-radiation-proof shell.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.

The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A driving rack locking device according to some embodiments of the present application will be described with reference to fig. 1 and 2.

The application provides a driving rack locking device for a safety rod driving mechanism of a reactor, so that when the reactor normally operates, the driving rack 1 of the safety rod driving mechanism can be locked through the driving rack locking device, and the safety rod can stably hover above the reactor.

As shown in fig. 1, the driving rack locking device includes a holding member, an abutting member 21 and a driving assembly, a locking groove 11 is formed on an outer side wall of one end of the driving rack 1 in the length direction, the holding member is disposed near an end of the driving rack 1 where the locking groove 11 is formed, the abutting member 21 is movably mounted on the holding member, so that the abutting member 21 is located on one side of the driving rack 1 in the radial direction, and the abutting member 21 can move on the holding member in the radial direction of the driving rack 1. When the reactor normally runs, the driving rack 1 stays at a preset position, and the locking groove 11 on the outer side wall of the driving rack 1 is opposite to the tightening piece 21.

The loose end of drive assembly can keep away from the one end counterbalance of drive rack 1 with top tight part 21, and the motion of the loose end of piece is got in the drive can promote top tight part 21, make top tight part 21 stretch out the holding piece and stretch into the locking groove 11 of drive rack 1 towards the one end of drive rack 1 and counterbalance with the lateral wall of drive rack 1, thereby make a part of top tight part 21 be located the holding piece, another part of top tight part 21 stretches into the locking groove 11 of drive rack 1, and the both ends of top tight part 21 respectively counterbalance with the loose end of drive assembly and the lateral wall of drive rack 1, and then carry out axial locking to drive rack 1 through top tight part 21, make drive rack 1 can't follow the axis direction motion of self.

In one embodiment of the present application, preferably, as shown in fig. 1, the holding member is a holding sleeve 2, and one end of the holding sleeve 2 in the length direction is a closed end, and the other end in the length direction is an open end; the retaining sleeve 2 is coaxially arranged at one end of the driving rack 1, which is provided with the locking groove 11 in the length direction, and the open end of the retaining sleeve 2 faces the driving rack 1, so that the driving rack 1 can extend into the retaining sleeve 2. Keep offering the spacing through-hole that runs through on the lateral wall of sleeve 2, top piece 21 and spacing through-hole looks adaptation for top piece 21 can install in spacing through-hole and along the radial direction motion of drive rack 1 in spacing through-hole. When it is desired to lock the drive rack 1, the top piece 21 can be moved towards the inside of the holding sleeve 2 by the movable end of the drive assembly, so that a portion of the top piece 21 extends into the holding sleeve 2 and is inserted into the locking groove 11 of the drive rack 1 to axially lock the drive rack 1 by means of the top piece 21.

In this embodiment, preferably, the locking groove 11 is disposed around the circumference of the driving rack 1, the sidewall of the retaining sleeve 2 is provided with a plurality of limiting through holes, the limiting through holes are circumferentially distributed at intervals along the circumference of the retaining sleeve 2, and each limiting through hole is internally provided with one propping member 21; the movable end of the driving assembly can drive the plurality of top members 21 to move simultaneously, so that one ends of the plurality of top members 21 are inserted into the locking groove 11 and tightly abutted against the outer side wall of the driving rack 1, the driving rack 1 is axially locked through the plurality of top members 21, and the stability of locking the driving rack 1 is improved.

In one embodiment of the present application, preferably, as shown in fig. 1, the driving assembly includes a stationary iron core 3, a movable iron core 4 and an electromagnetic coil 6, the stationary iron core 3 and the movable iron core 4 are relatively spaced and sleeved on the retaining sleeve 2, and the stationary iron core 3 is fixedly disposed relative to the retaining sleeve 2, and the movable iron core 4 can move relative to the retaining sleeve 2 along the axial direction of the retaining sleeve 2 to be close to or far away from the stationary iron core 3, so that the movable iron core 4 can reciprocate between a first station far away from the stationary iron core 3 and a second station against the stationary iron core 3.

The electromagnetic coil 6 is arranged around the static iron core 3 and the movable iron core 4, and the electromagnetic coil 6 can be electrically connected with a power supply to realize the on-off of the electromagnetic coil 6; when the electromagnetic coil 6 is energized, an electromagnetic force can be generated between the movable iron core 4 and the stationary iron core 3, the movable iron core 4 moves from a first station far away from the stationary iron core 3 to a second station against the stationary iron core 3 under the attraction of the electromagnetic force, the movable iron core 4 in fig. 2 is located at the first station, and the movable iron core 4 in fig. 1 is located at the second station.

Preferably, as shown in fig. 1 and fig. 2, a first elastic member 5 is further disposed between the stationary core 3 and the movable core 4, the first elastic member 5 is sleeved on the holding sleeve 2, and two ends of the first elastic member 5 respectively abut against the stationary core 3 and the movable core 4; the first elastic element 5 can provide elastic driving force for the movable iron core 4, so that the movable iron core 4 can move towards the direction far away from the static iron core 3, and therefore when the electromagnetic coil 6 is powered off, the movable iron core 4 returns to the first station under the action of the first elastic element 5.

Move iron core 4 and be drive assembly's expansion end promptly, when moving iron core 4 cover and locate and keep sleeve 2 on, move the inside wall of iron core 4 and push up the piece 21 and face to and lean on mutually, and along with moving iron core 4 and remove to the second station by first station, move iron core 4 and will promote and push up the piece 21 and make a part of piece 21 of pushing up stretch into the locking groove 11 of drive rack 1 towards the inside motion that keeps sleeve 2 to carry out axial locking to drive rack 1.

In this embodiment, preferably, the inner side wall of the movable iron core 4 is provided with a relief groove 41 along the circumferential direction of the movable iron core 4, and the side wall surface of the relief groove 41 on the side away from the stationary iron core 3 is an inclined surface 42; when the plunger 4 is at the first working position, as shown in fig. 2, the relief groove 41 is opposite to the top member 21, so that the top member 21 can partially enter the relief groove 41, and simultaneously the top member 21 can completely withdraw from the inside of the holding sleeve 2, thereby keeping the inside of the holding sleeve 2 clear, and the driving rack 1 can be inserted into a predetermined position in the holding sleeve 2 or the driving rack 1 can be extracted from the holding sleeve 2 to drive the safety rod to be inserted into the reactor core.

When the driving rack 1 needs to be locked, the electromagnetic coil 6 is electrified, the movable iron core 4 moves from the first station to the second station, and the inclined surface 42 of the abdicating groove 41 pushes the propping piece 21 to move towards the inside of the holding sleeve 2 along with the movement of the movable iron core 4; when the movable iron core 4 reaches the second station, as shown in fig. 1, the pushing member 21 is pushed out of the abdicating groove 41, the inner side wall of the movable iron core 4 connected with the inclined surface 42 of the abdicating groove 41 abuts against one end of the pushing member 21, and the other end of the pushing member 21 extends into the locking groove 11 of the driving rack 1 and abuts against the outer side wall of the driving rack 1, so as to lock the driving rack 1.

When the driving rack 1 needs to be pulled out of the holding sleeve 2, firstly, the electromagnetic coil 6 is powered off to enable the movable iron core 4 to return to the first station under the action of the first elastic piece 5, and the abdicating groove 41 of the movable iron core 4 is opposite to the propping piece 21; when the driving rack 1 is driven to move outwards of the retaining sleeve 2, the acting force between the driving rack 1 and the tightening member 21 enables the tightening member 21 to move towards the receding groove 41 until the tightening member 21 is completely withdrawn from the locking groove 11 of the driving rack 1, so that the unlocking of the driving rack 1 is realized.

Preferably, the top member 21 is a ball so that the plunger 4 and the driving rack 1 push the top member 21 to move. Preferably, the cross section of the locking groove 11 of the driving rack 1 is arc-shaped and matched with the ball, so that the ball can penetrate into the locking groove 11 and is tightly abutted against the arc-shaped side wall of the locking groove 11; and simultaneously, the driving rack 1 is convenient to push the ball out of the locking groove 11.

In this embodiment, preferably, as shown in fig. 1 and 2, the driving rack locking device further includes a stopper assembly disposed in the retaining sleeve 2, and capable of stopping the locking member to prevent the holding member 21 from falling out of the limit through hole when the driving rack 1 is not in a position facing the holding member 21.

Preferably, the stopping assembly comprises a stopping sleeve 7 and a second elastic member 8, the stopping sleeve 7 is arranged in the retaining sleeve 2, the closed end of the stopping sleeve 7 faces the driving rack 1, one end of the second elastic member 8 is positioned in the stopping sleeve 7 and abuts against the closed end of the stopping sleeve 7, and the other end of the second elastic member 8 abuts against the closed end of the retaining sleeve 2; the second elastic member 8 can provide a driving force to the holding sleeve 2 so that the holding sleeve 2 can move toward the direction of driving the rack 1. When the driving rack 1 is moved from the position facing the abutting member 21, as shown in fig. 2, the holding sleeve 2 is driven by the second elastic member 8 to move to the position where the side wall of the holding sleeve 2 faces the abutting member 21, so that the abutting member 21 is stopped by the holding sleeve 2 to prevent the abutting member 21 from falling out of the limit through hole. When it is desired to lock the drive rack 1, the drive rack 1 is moved towards the stop sleeve 7 and pushes the stop sleeve 7 to move the stop sleeve 7 away from the position directly opposite the abutment member 21, as shown in fig. 1.

In this embodiment, preferably, as shown in fig. 2, a step portion 22 is provided on the inner side wall of the retaining sleeve 2 between the closed end thereof and the limiting through hole, a boss portion 71 is provided on the outer side wall of the stopping sleeve 7, the boss portion 71 is located between the step portion 22 and the closed end of the retaining sleeve 2, the stopping sleeve 7 is driven by the second elastic member 8 to move towards the driving rack 1 until the boss portion 71 abuts against the step portion 22, and the outer side wall of the stopping sleeve 7 is opposite to the tightening member 21; so that the movement of the holding sleeve 2 is limited by the step 22.

In one embodiment of the present application, it is preferable that the driving rack locking device further includes a holding-down circuit, and the solenoid 6 is electrically connected to a power source through the holding-down circuit to be able to change an operating power of the solenoid 6. When the driving rack 1 needs to be locked, the electromagnetic coil 6 is powered by a power supply in a high-power mode to start the movable iron core 4, the movable iron core 4 can move towards the static iron core 3 to abut against the static iron core 3, and the jacking piece 21 is pushed to be inserted into the driving rack 1; after the clamping of the top fastening piece 21 on the driving rack 1 is completed, the power supply power of the power supply to the electromagnetic coil 6 is reduced through the holding-down circuit, so that the electromagnetic coil 6 works under the working condition of low-power supply, and the movable iron core 4 is kept at a station abutting against the static iron core 3; therefore, the high-power starting of the driving rack locking device and the power supply mode of low-power keeping are realized, the heat emission is reduced, the phenomenon that the performance of the device is influenced due to the fact that the temperature in the device rises because the device runs under high power for a long time is avoided, and the driving rack locking device can be guaranteed to be kept in the locking state of the driving rack 1 for a long time.

In one embodiment of the present application, preferably, as shown in fig. 1 and 2, the driving rack locking device further comprises an irradiation-proof housing 9, the irradiation-proof housing 9 houses the holding sleeve 2 and the driving assembly inside, and the irradiation-proof housing 9 can be connected with the housing of the safety bar driving mechanism and can expose the open end of the holding sleeve 2 toward the driving rack 1 so that the driving rack 1 protrudes into the holding sleeve 2.

Preferably, the material of the radiation-proof housing 9 is 316H.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.