阅读说明：本技术 一种主备互锁直接启泵装置 (Main-standby interlocking direct pump starting device ) 是由 熊子南 曾萍 于 2021-10-18 设计创作，主要内容包括：本申请公开了一种主备互锁直接启泵装置,涉及消防水泵控制器的技术领域,改善了主备用泵同时合闸的误操作的问题,其包括设置在消防水泵控制柜内部的两个负荷隔离开关动触头,负荷隔离开关动触头对称安装在消防水泵控制柜的左右两侧,负荷隔离开关动触头分别连接有一台消防水泵电机,负荷隔离开关动触头的下方分别设置有用于触发负荷隔离开关动触头的推块,推块处于朝向或远离负荷隔离开关动触头移动的状态,两推块的下方均设置有推杆,推杆上设置有将推杆旋转连接在消防水泵控制柜上的第一转轴,相邻两推杆之间连接有驱动盘,驱动盘上接触推杆的位置设置有供推杆连接的连接轴。本申请具有减少主备用泵同时合闸的误操作的效果。(The application discloses a master-slave interlocking direct pump starting device, relates to the technical field of fire pump controllers, improves the problem of misoperation of simultaneous switching-on of master-slave pumps, it is including setting up two load isolator moving contacts inside the fire water pump switch board, the left and right sides at the fire water pump switch board is installed to load isolator moving contact symmetry, the load isolator moving contact is connected with a fire water pump motor respectively, the below of load isolator moving contact is provided with the ejector pad that is used for triggering the load isolator moving contact respectively, the ejector pad is in the state towards or keeps away from the removal of load isolator moving contact, the below of two ejector pads all is provided with the push rod, be provided with the first pivot of rotating connection on the fire water pump switch board with the push rod on the push rod, be connected with the driving-disc between the two adjacent push rods, the position of contact push rod on the driving-disc is provided with the connecting axle that supplies the push rod to connect. This application has the effect that reduces the maloperation that main and backup pump closed a floodgate simultaneously.)

1. The utility model provides a direct pump starting device of activestandby interlocking, is including setting up two load isolator moving contacts (1) in fire pump switch board (5) inside, load isolator moving contact (1) symmetry is installed in the left and right sides of fire pump switch board (5), load isolator moving contact (1) is connected with a fire pump motor (17) of fighting respectively, its characterized in that: the novel fire-fighting water pump is characterized in that push blocks (2) used for triggering the load isolating switch moving contacts (1) are respectively arranged below the load isolating switch moving contacts (1), the push blocks (2) are located in a state of moving towards or away from the load isolating switch moving contacts (1), push rods (14) are arranged below the push blocks (2), first rotating shafts (15) for rotatably connecting the push rods (14) to a fire-fighting water pump control cabinet (5) are arranged on the push rods (14), a driving disc (12) is connected between every two adjacent push rods (14), a connecting shaft (122) for connecting the push rods (14) is arranged at a position on the driving disc (12) contacting the push rods (14), and a kidney-shaped groove (141) for allowing the connecting shaft (122) to slide is formed in a position where the push rods (14) are connected with the connecting shaft (122).

2. The master-slave interlocking direct pump starting device according to claim 1, characterized in that: be connected with installation piece (6) on the lateral wall of ejector pad (2), the lock has connecting block (7) on installation piece (6), be connected with between the upper end of connecting block (7) and fire water pump control cabinet (5) pulling ejector pad (2) to being close to first extension spring (11) that load isolator moving contact (1) direction removed, fire water pump control cabinet (5) inside is provided with makes ejector pad (2) be in the locating part of keeping away from load isolator moving contact (1).

3. The master-slave interlocking direct pump starting device according to claim 2, characterized in that: the locating part is for rotating pin (8) of connecting in fire pump control cabinet (5) inside, be connected with on pin (8) and make pin (8) rotatory second pivot (9) of relative fire pump control cabinet (5), inside upside that is close to connecting block (7) one end in pin (8) of fire pump control cabinet (5) is provided with mounting panel (19), be connected with second extension spring (18) between mounting panel (19) and pin (8), when ejector pad (2) is in the position of keeping away from load isolator moving contact (1), the one end overlap joint that pin (8) are close to connecting block (7) is on the last face of connecting block (7), when push rod (14) of pin (8) one side takes place the rotation under the drive of driving-disc (12), the one end that connecting block (7) were kept away from in pin (8) butt push rod (14).

4. The master-slave interlocking direct pump starting device according to claim 3, wherein: and a limiting block (10) which enables the stop lever (8) to be in a horizontal state is arranged between the second tension spring (18) and the second rotating shaft (9) of the stop lever (8).

5. The master-slave interlocking direct pump starting device according to claim 2, characterized in that: the fire pump control cabinet is characterized in that a pull handle (72) for pulling the connecting block (7) to move away from the load isolating switch moving contact (1) is arranged on the connecting block (7), a cabinet door (53) is hinged to the fire pump control cabinet (5), and an opening (531) for the pull handle (72) to extend to the outside of the cabinet door (53) is formed in the position, corresponding to the position where the pull handle (72) slides, of the cabinet door (53).

6. The master-slave interlocking direct pump starting device according to claim 2, characterized in that: one side of the connecting block (7) close to the stop lever (8) is provided with a guide surface (73) which is obliquely and downwards arranged from the upper end of the connecting block (7) to the lower end of the connecting block (7).

7. The master-slave interlocking direct pump starting device according to claim 1, characterized in that: one side that ejector pad (2) is close to fire water pump control cabinet (5) is provided with bottom plate (3) that the width is greater than ejector pad (2) width, the cover is equipped with base (4) on ejector pad (2), set up spout (41) that supply ejector pad (2) to slide on base (4), storage tank (42) that supply bottom plate (3) holding are seted up to one side that base (4) are close to fire water pump control cabinet (5).

8. The master-slave interlocking direct pump starting device according to claim 1, characterized in that: the first rotating shaft (15) is arranged at the position of the push rod (14) close to the driving disc (12).

Technical Field

The application relates to the technical field of fire pump controllers, in particular to a master-slave interlocking direct pump starting device.

Background

The master-slave interlocking direct pump starting device is a switching-on/switching-off device installed in a fire pump control cabinet, when a fire pump control line fails, a fire pump is directly started through mechanical switching-on, switching is performed through pure mechanical action without depending on any secondary circuit and power supply energizing action, the existence of fault points can be effectively reduced, and the reliability of the fire pump in the use process is improved.

The utility model with the publication number of CN205858637U discloses a fire pump controller with the functions of electric control starting and mechanical emergency starting of a fire pump, which comprises a control cabinet body, wherein a self-starting lock control switch and a remote control lock control switch are arranged at the lower part in the cabinet body; a PLC programmable controller is arranged in the control cabinet body, and 2 groups of star-delta starting operation units capable of operating normally are arranged in the control cabinet body and respectively control 2 fire-fighting water pump motors; 2 sets of emergency starting devices are also arranged in the control cabinet body and respectively control 2 fire-fighting water pump motors; correspondingly, an unlocking operation handle with a quick energy storage mechanism is arranged on the emergency starting device, and a 'total stop' button is arranged on a panel of the cabinet body.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: the mechanical emergency starting is mainly realized through a circuit breaker or a load isolating switch, mechanical interlocking is not arranged between the main and standby switches, and misoperation that the main and standby pumps are switched on simultaneously is easy to occur.

Disclosure of Invention

In order to reduce misoperation of simultaneous switching on of a main pump and a standby pump, the application provides a main and standby interlocking direct pump starting device.

The application provides a master spare interlocking directly starts pump unit adopts following technical scheme:

a master-slave interlocking direct pump starting device comprises two load isolating switch moving contacts arranged in a fire pump control cabinet, the moving contacts of the load isolating switch are symmetrically arranged at the left side and the right side of the fire pump control cabinet, the moving contacts of the load isolating switch are respectively connected with a fire pump motor, push blocks used for triggering the moving contact of the load isolating switch are respectively arranged below the moving contact of the load isolating switch, the push blocks are in a state of moving towards or away from the moving contact of the load isolating switch, push rods are arranged below the two push blocks, the push rods are provided with a first rotating shaft which rotationally connects the push rods to the fire pump control cabinet, a driving disc is connected between every two adjacent push rods, the position of the driving disc contacting the push rod is provided with a connecting shaft for the push rod to connect, and the position of the push rod connected with the connecting shaft is provided with a kidney-shaped groove for the connecting shaft to slide.

Through adopting above-mentioned technical scheme, setting through the driving-disc, when the driving-disc is rotatory, drive the rotation of two push rods of being connected with the driving-disc, when the driving-disc clockwise rotation, the relative first pivot rotation of left push rod of driving-disc, the inside at the kidney slot is connected in the connecting axle slides, make left push rod rotatory to the one end of keeping away from the load isolator moving contact, at this moment, the push rod on right side is rotatory to the direction that is close to the load isolator moving contact, during the push rod contact load isolator moving contact on right side, realize the start-up operation to the fire pump motor on right side, because the driving-disc only can make the push rod and the load isolator moving contact realization of one side in rotatory in-process touch, thereby can effectively reduce the possibility of the maloperation that the master and backup pump closed simultaneously.

Optionally, an installation block is connected to the side wall of the push block, a connection block is buckled on the installation block, a first tension spring for pulling the push block to move towards the direction close to the moving contact of the load isolating switch is connected between the connection block and the upper end of the fire water pump control cabinet, and a limiting part for enabling the push block to be located far away from the moving contact of the load isolating switch is arranged inside the fire water pump control cabinet.

Through adopting above-mentioned technical scheme, through the setting of first extension spring, when spacing subassembly relieved the restriction to the ejector pad, first extension spring pulling ejector pad removes to the direction that is close to the load isolator moving contact fast to can realize the ejector pad and to the quick start of load isolator moving contact, can effectively reduce the time that electric arc exists, improve the security that the load isolator moving contact opened and close the in-process.

Optionally, the locating part is the pin of rotation connection inside the fire pump control cabinet, be connected with the rotatory second pivot of the relative fire pump control cabinet of messenger's pin on the pin, the inside upside that is close to connecting block one end in the pin of fire pump control cabinet is provided with the mounting panel, be connected with the second extension spring between mounting panel and the pin, when the ejector pad is in the position of keeping away from the load isolator moving contact, the one end overlap joint that the pin is close to the connecting block is on the last face of connecting block, and when the push rod of pin one side took place rotatoryly under the drive-disc's drive, the one end of connecting block was kept away from at the pin to the push rod butt.

Through adopting above-mentioned technical scheme, through the setting of pin, when the ejector pad was kept away from the load isolator moving contact, the upper end of ejector pad is arranged in to the pin, when the push rod butt was kept away from one side of ejector pad at the pin, the pin promoted the ejector pad and moved to the direction of keeping away from the load isolator moving contact, when the pin continued to rotate under the promotion of push rod, the one end of pin contact ejector pad breaks away from the ejector pad, when the upper end of ejector pad was arranged in to the pin, the pin made the pin be in the upper end of ejector pad all the time under the effect of mounting panel and second extension spring, realize the limiting displacement to the ejector pad.

Optionally, a position of the stop lever between the second tension spring and the second rotating shaft is provided with a limiting block for enabling the stop lever to be in a horizontal state.

By adopting the technical scheme, the limit block limits the pushing action of the push block on the stop lever when the push block abuts against the stop lever.

Optionally, be provided with the pull handle that the pulling connecting block removed to keeping away from the load isolator moving contact on the connecting block, fire water pump control cabinet is last to articulate there is the cabinet door, the position that the cabinet door corresponds the pull handle and slides is seted up and is supplied the pull handle to extend to the outside opening of cabinet door.

Through adopting above-mentioned technical scheme, through the setting of pull handle, be convenient for realize through the connecting block drive ejector pad in the cabinet door outside to keeping away from the one end removal of load isolator moving contact.

Optionally, a guide surface which is obliquely and downwardly arranged from the upper end of the connecting block to the lower end of the connecting block is arranged on one side of the connecting block, which is close to the stop rod.

Through adopting above-mentioned technical scheme, through the setting of guide face, when the connecting block moved to the direction of keeping away from the load isolator moving contact, the guide face realized the convenient removal between the relative baffle of connecting block.

Optionally, one side that the ejector pad is close to fire water pump switch board is provided with the bottom plate that the width is greater than the ejector pad width, the cover is equipped with the base on the ejector pad, set up the spout that supplies the ejector pad to slide on the base, the storage tank that supplies the bottom plate holding is seted up to one side that the base is close to fire water pump switch board.

Through adopting above-mentioned technical scheme, through the setting of base for the ejector pad slides all the time through the bottom plate and connects on the base, and the ejector pad slides and connects inside the spout, is convenient for lead the moving direction of ejector pad.

Optionally, the first rotating shaft is disposed at a position where the push rod is close to the driving disc.

Through adopting above-mentioned technical scheme, because first pivot setting is close to the one end of driving-disc at the push rod, when the rotatory less angle of driving-disc, the push rod is kept away from the great distance of the one end swing of driving-disc, improves the convenience of driving-disc rotation in-process.

In summary, the present application includes at least one of the following benefits:

1. the right push rod rotates towards the direction close to the moving contact of the load isolating switch, when the right push rod contacts the moving contact of the load isolating switch, the starting operation of the right fire pump motor is realized, and as the driving disc only can enable the push rod on one side to be in touch with the moving contact of the load isolating switch in the rotating process, the possibility of misoperation of simultaneously switching on the main pump and the standby pump can be effectively reduced;

2. through the setting of first extension spring, when spacing subassembly relieved the restriction to the ejector pad, first extension spring pulling ejector pad removes to the direction that is close to the load isolator moving contact fast to can realize the quick start of ejector pad to the load isolator moving contact, can effectively reduce the time that electric arc exists, improve the security that the load isolator moving contact was opened and close the in-process.

Drawings

FIG. 1 is a schematic structural view of the overall structure of the present embodiment;

FIG. 2 is a schematic structural diagram of the salient base structure of the present embodiment;

FIG. 3 is a schematic view showing a state where the drive disk of the present embodiment rotates counterclockwise;

FIG. 4 is a schematic view showing a state where the disk of the present embodiment is rotated clockwise;

FIG. 5 is an exploded view of the highlighted turntable configuration of the present embodiment;

FIG. 6 is a schematic structural diagram of the installation structure of the highlighting dial of the present embodiment.

Description of reference numerals: 1. a moving contact of the load isolating switch; 2. a push block; 3. a base plate; 4. a base; 41. a chute; 42. a containing groove; 5. a fire pump control cabinet; 51. a back plate; 52. a side plate; 53. a cabinet door; 531. an opening; 6. mounting blocks; 7. connecting blocks; 71. a card slot; 72. pulling a handle; 73. a guide surface; 8. a stop lever; 9. a rotating shaft; 10. a limiting block; 11. a first tension spring; 12. a drive disc; 121. a connecting rod; 122. a connecting shaft; 123. mounting the cylinder; 13. a third rotating shaft; 14. a push rod; 141. a kidney-shaped groove; 15. a first rotating shaft; 16. a turntable; 161. inserting a rod; 17. a fire pump motor; 18. a second tension spring; 19. and (7) mounting the plate.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses a master-slave interlocking direct pump starting device. Referring to fig. 1, the direct pump starting device of activestandby interlocking is including setting up two load isolator moving contacts 1 at fire water pump control cabinet 5 inside, the left and right sides at fire water pump control cabinet 5 is installed to two load isolator moving contacts 1 symmetry, load isolator moving contact 1 is connected with fire pump motor 1717 through the power cord respectively, the below of load isolator moving contact 1 is provided with ejector pad 2 that is used for triggering load isolator moving contact 1, when ejector pad 2 contacts load isolator moving contact 1, the realization is to the start-up operation of load isolator moving contact 1.

Referring to fig. 1 and 2, push block 2 has the width to be greater than bottom plate 3 of push block 2 width towards one side welded fastening of fire water pump control cabinet 5, the cover is equipped with base 4 on the push block 2, set up the spout 41 that supplies push block 2 to reciprocate along base 4 on the base 4, the width of spout 41 is unanimous with push block 2's width, base 4 offers the storage tank 42 that is used for holding bottom plate 3 towards one side of fire water pump control cabinet 5, the extension length of storage tank 42 is unanimous with the extension length of spout 41, when carrying out the installation of push block 2, wear out push block 2 from spout 41, later with base 4 welded fastening on fire water pump control cabinet 5, realize reciprocating of push block 2 relative base 4, when push block 2 moves to and contacts with load isolator moving contact 1, push block 2 realizes the start-up of load isolator moving contact 1.

Referring to fig. 3, the fire pump control cabinet 5 includes a back plate 51 and a side plate 52 connected to the circumference of the back plate 51, the fire pump control cabinet 5 is integrally in the shape of a rectangular box, an installation block 6 is welded and fixed on one side of the push block 2 facing the vertical center line of the fire pump control cabinet 5, a connection block 7 is fastened on the installation block 6, a slot 71 for installing the installation block 6 is formed at a position of the connection block 7 corresponding to the installation block 6, a stop lever 8 is installed in the fire pump control cabinet 5, a second rotating shaft 9 is rotatably connected to the middle of the stop lever 8, the second rotating shaft 9 is fixedly connected to the fire pump control cabinet 5, a limit block 10 is welded and fixed at a position on the upper side of the stop lever 8 of the fire pump control cabinet 5, for the left stop lever 8, the limit block 10 is disposed at a left position of the second rotating shaft 9, the limit block 10 of the right stop lever 8 and the left limit block 10 are symmetrically disposed with the vertical symmetrical center line of the fire pump control cabinet 5 as an axis, taking the left blocking lever 8 as an example, when the left side of the blocking lever 8 contacts the limiting block 10, the blocking lever 8 is in a horizontal state. When the push block 2 is at a position far away from the moving contact 1 of the load isolating switch, the stop lever 8 is abutted against the upper plate surface of the connecting block 7.

Referring to fig. 3, be connected with first extension spring 11 between the last face of connecting block 7 and the last side plate 52 of fire water pump control cabinet 5, when the pin 8 is rotatory to the direction of keeping away from load isolator moving contact 1, drive ejector pad 2 and remove one section distance to the direction of keeping away from load isolator moving contact 1, when the pin 8 rotates to separately with connecting block 7, first extension spring 11 pulling connecting block 7 drives ejector pad 2 and removes to the direction that is close to load isolator moving contact 1, thereby improve the speed that ejector pad 2 removed to load isolator moving contact 1, can effectively reduce the time that electric arc exists, improve the security that load isolator moving contact 1 opened and close the in-process.

Referring to fig. 1 and 3, a pull handle 72 is connected to the connection block 7, and when the operation of the fire pump motor 17 needs to be stopped, the pull handle 72 is pulled to make the pull handle 72 drive the connection block 7 to realize that the push block 2 moves in a direction away from the movable contact 1 of the load isolation switch. In the process that the connecting block 7 moves downwards, the stop lever 8 is pushed towards the direction far away from the moving contact 1 of the load isolating switch. Fire pump control cabinet 5 has mounting panel 19 in the upside welded fastening of pin 8, is connected with second extension spring 18 between pin 8 and the mounting panel 19, and when connecting block 7 removed to the downside of pin 8, the 18 pulling pin 8 of second extension spring of connecting on the pin 8 reset for pin 8 contacts stopper 10 and is in the horizontally state. At this moment, the stop lever 8 abuts against the upper plate surface of the connecting block 7, so that the limiting effect on the push block 2 is realized.

Referring to fig. 3, a guide surface 73 obliquely and downwardly arranged from the upper end surface of the connecting block 7 to the lower end surface of the connecting block 7 is arranged on one side of the connecting block 7 close to the stop lever 8, and when the connecting block 7 is moved in a direction away from the movable contact 1 of the load isolating switch by using the pull handle 72, the inclined surface of the connecting block 7 moves along the stop lever 8, so that the convenience of the connecting block 7 in the moving process relative to the stop lever 8 is improved.

Referring to fig. 4, a driving disc 12 for driving the blocking rods 8 to rotate relative to the second rotating shaft 9 is disposed between two adjacent blocking rods 8, the driving disc 12 rotates relative to the back plate 51, a connecting rod 121 is connected to the middle of the driving disc 12, a third rotating shaft 13 is rotatably connected to the connecting rod 121, the third rotating shaft 13 is welded and fixed to the back plate 51, two push rods 14 are symmetrically disposed on the left and right sides of the driving disc 12, a first rotating shaft 15 for the push rods 14 to rotate relative to the back plate 51 is disposed on the back plate 51, when the push rods 14 rotate relative to the first rotating shaft 15 to contact one end of the blocking rods 8 far away from the second tension spring 18 and push one end of the blocking rods 8 far away from the second tension spring 18 upwards, one end of the blocking rods 8 close to the connecting block 7 presses the connecting block 7 downwards, and when one end of the blocking rods 8 close to the connecting block 7 rotates to be separated from the connecting block 7, the first tension spring 11 pulls the connecting block 7 to drive the push block 2 to move towards the movable contact of the load isolation switch 1, thereby realizing the starting operation of the movable contact 1 of the load isolating switch.

Referring to fig. 3, the first rotating shaft 15 is installed on one side of the push rod 14 close to the driving disk 12, so that when the driving disk 12 rotates for a certain distance, a larger rotational displacement is achieved at one end of the push rod 14 far from the driving disk 12.

Referring to fig. 3 and 4, a kidney-shaped groove 141 is formed at a position where the push rod 14 contacts the driving disc 12, a connecting shaft 122 slidably connected in the kidney-shaped groove 141 is fixedly welded on the driving disc 12, when the driving disc 12 rotates counterclockwise relative to the back plate 51, the push rod 14 on the left side rotates under the action of the driving disc 12 to a state of inclining downwards from a position far away from the driving disc 12 to a position close to the driving disc 12, and meanwhile, the push rod 14 on the right side also rotates to a state of inclining downwards, so that in the process that the push rod 14 on the left side pushes the stop lever 8 on the left side, the push rod 14 on the right side moves to a position far away from the stop lever 8, and at this time, the driving operation of the movable contact 1 of the load isolation switch on the left side is realized.

Referring to fig. 4, when the driving disc 12 rotates clockwise relative to the back plate 51, the left push rod 14 rotates to a state of inclining downward from a position close to the driving disc 12 to a position far away from the driving disc 12, and the right push rod 14 rotates to a state of inclining upward from a position close to the driving disc 12 to a position far away from the driving disc 12, so that the right push rod 14 shifts the right stop lever 8, and when the right stop lever 8 rotates relative to the second rotating shaft 9 to be separated from the connecting block 7, the first tension spring 11 connected to the right connecting block 7 pulls the connecting block 7 to drive the push block 2 to move to a position close to the right load isolation switch moving contact 1, thereby triggering the right load isolation switch moving contact 1.

Referring to fig. 3 and 4, in the process of rotation of the driving disc 12, the moving contacts 1 of the load disconnectors on the left and right sides only have the state that one moving contact 1 of one load disconnector is opened, so that the two moving contacts 1 of the load disconnectors cannot be opened simultaneously, the misoperation of simultaneous closing of the main pump and the backup pump can be effectively reduced, and the safety in the operation process is improved.

Referring to fig. 5, be connected with cabinet door 53 on fire water pump control cabinet 5, be connected with carousel 16 on driving-disc 12, carousel 16 arranges the outside of cabinet door 53 in, symmetrical welding has installation section of thick bamboo 123 on driving-disc 12, carousel 16 has the inserted bar 161 of pegging graft in installation section of thick bamboo 123 towards one side welding of installation section of thick bamboo 123, when cabinet door 53 is closed, the grafting cooperation through inserted bar 161 and installation section of thick bamboo 123 realizes being connected between carousel 16 and the driving-disc 12, when the outside rotatory carousel 16 at cabinet door 53, drive the rotation of the inside driving-disc 12 of fire water pump control cabinet 5, thereby realize the outside rotatory operation to driving-disc 12 at cabinet door 53, improve the convenience of driving-disc 12 rotation in-process.

Referring to fig. 5 and 6, the cabinet door 53 is provided with an opening 531 through which the pull handle 72 extends to the outside of the cabinet door 53, and when the cabinet door 53 is closed, the pull handle 72 can be operated outside the cabinet door 53.

The implementation principle of the master-slave interlocking direct pump starting device in the embodiment of the application is as follows:

when the starting operation of the fire pump motor 17 is performed, the rotary disc 16 is rotated clockwise, so that the rotary disc 16 drives the driving disc 12 to rotate relative to the back plate 51, the push rod 14 on the left side of the driving disc 12 is in a state of inclining downwards from a position close to the driving disc 12 to a position far away from the driving disc 12, the push rod 14 on the right side inclines upwards from a position close to the driving disc 12 to a position far away from the driving disc 12, the push rod 14 on the right side contacts the stop lever 8 and pushes the stop lever 8 on the right side to rotate clockwise relative to the second rotating shaft 9, when the stop lever 8 rotates clockwise, the connecting block 7 drives the push block 2 to move towards the direction far away from the moving contact 1 of the load isolating switch, when the stop lever 8 is separated from the connecting block 7, the first tension spring 11 pulls the connecting block 7 to drive the push block 2 to move towards the direction close to the moving contact 1 of the load isolating switch, so that the triggering effect on the moving contact 1 of the load isolating switch on the right side is realized. Similarly, when the rotating disc 16 rotates anticlockwise, the moving contact 1 of the load isolating switch on the left side is triggered, and the moving contact 1 of the load isolating switch on one side can be triggered to start at most in the rotating process of the rotating disc 16, so that the misoperation of simultaneous switching on of the main pump and the standby pump can be effectively reduced, and the safety in the switching-on process is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.