CN219123141U - Double-layer visual isolating switch - Google Patents

Abstract

The utility model provides a double-layer visual isolating switch which comprises a shell, an operating mechanism, a sliding block and a contact system, wherein the operating mechanism, the sliding block and the contact system are arranged in the shell; the shell comprises a base, a middle cover and a transparent upper cover which are sequentially covered, a lower cavity is formed by surrounding the base and the middle cover, and an upper cavity is formed by surrounding the middle cover and the transparent upper cover; the contact system is arranged in the upper cavity, the operating mechanism and the sliding block are arranged in the lower cavity, the layered design is realized, the structural layout in the upper cavity and the structural layout in the lower cavity are not mutually influenced, the contact system does not need to give way to the operating mechanism, the contact system has enough space layout, and the structures of the contact knife, the movable contact and other parts can be unified, so that the types of parts are reduced; the state of the contact system in the upper chamber can be visually and clearly confirmed through the transparent upper cover without dead angles.

Description

Double-layer visual isolating switch

Technical Field

The utility model relates to the field of switch equipment, in particular to the field of load isolating switches, and further particularly relates to a double-layer visual isolating switch.

Background

The isolating switch has certain switching-on and switching-off capacity, is a device for isolating a power failure part from a live part and causing an obvious disconnection point to isolate fault equipment or carry out power failure maintenance. The existing load disconnecting switch is shown as a switching device of a quick-opening and closing load disconnecting switch disclosed in CN 200710195757.0. Currently, the existing load disconnecting switch generally has the following disadvantages that an operating mechanism and a contact system are arranged in the same cavity of a shell: 1. the structure layout is compact, and the operating mechanism occupies a larger position, so that the structure of the contact system is required to be rearranged for abdication, so that the structures of movable contacts, contact cutters and the like of the structural system are not uniform, and the variety of used parts is increased; 2. even if the shell is made of transparent materials, the on/off condition of the internal contact system cannot be intuitively and accurately confirmed, and misjudgment is easy to cause or abnormality is difficult to find. 3. When the product sets up auxiliary switch, need trompil in order to assemble auxiliary switch on the casing, the customer can adopt sealing plug (like the rubber buffer) to block up the through-hole when not needing the auxiliary switch of installation, but this through-hole through-contact system, in order to avoid the outside environment to the electric influence of inside contact system, and inside if produce the electric arc condition of leaking when switching on or breaking the load electric current of different natures, the rubber buffer is high with the sealed cooperation requirement of through-hole, even accomplish the assembly, also can be washed away by the unrestrained of contact system production, current almost is difficult to satisfy, if the shutoff is not enough, can lead to outside steam/dust to get into in the casing and cause contact system's function damage or electric arc to leak burning and lead to the incident. Therefore, the customer needs to explicitly select whether to have an auxiliary switch or not when purchasing the product, and the customer can only return after ordering by mistake.

Disclosure of Invention

Therefore, the utility model provides a double-layer visual isolating switch for solving the problems.

In order to achieve the above purpose, the technical scheme provided by the utility model is as follows:

a double-layer visual isolating switch comprises a shell, an operating mechanism, a sliding block and a contact system, wherein the operating mechanism, the sliding block and the contact system are arranged in the shell; the shell comprises a base, a middle cover and a transparent upper cover which are sequentially covered, a lower cavity is formed by surrounding the base and the middle cover, and an upper cavity is formed by surrounding the middle cover and the transparent upper cover; the contact system is assembled in the upper cavity and comprises a sliding beam with a movable contact group and a contact knife group, wherein the contact knife group comprises contact knives symmetrically arranged on two sides of the sliding beam, and the contact knives extend outwards to the outside of the shell; the operating mechanism is in driving connection with the sliding block and is assembled in the lower cavity together, the sliding block penetrates through the middle cover and is connected with the sliding beam, and the operating mechanism drives the sliding beam to slide through the sliding block so as to control the contact or separation of the movable contact group on the sliding beam and the two contact knives of the contact knife group.

Further, operating device is energy storage type operating device, has energy storage spring and drive energy storage spring energy storage's drive pivot, and drive pivot's first end is located down the cavity, and its second end passes well lid and transparent upper cover in proper order in order to stretch out transparent upper cover, stretch out the second end of transparent upper cover's drive pivot is equipped with the handle, still cup jointed sealed lantern ring and the instruction lantern ring that has the instruction arrow in the drive pivot, sealed lantern ring seal fit is in the fit clearance of drive pivot and well lid, the sealed fit of instruction lantern ring is in the fit clearance of drive pivot and transparent upper cover.

Further, the upper surface of well lid towards upper chamber is provided with first spout and is located the through window of first spout, the smooth roof beam slidable assembly in first spout and cover the through window, be provided with the joint on the slider, the joint passes through the through window and fixed joint to the smooth roof beam.

Further, the middle cover is provided with a baffle plate at two sides of the first chute, and the baffle plate is also abutted against the side surface of the sliding beam; the touch knife groups are provided with a plurality of groups, and touch knives of adjacent touch knife groups are isolated by a partition plate; an arc extinguishing chamber is arranged beside each contact knife.

Further, two spacing buffer blocks which are arranged at intervals are fixed on the middle cover, spacing convex parts are arranged on the sliding beam, and the spacing convex parts are positioned between the two spacing buffer blocks.

Further, the sliding beam is further provided with an elastic pin, the transparent upper cover is provided with a limiting pin hole, and when the sliding beam slides to the opening position, the elastic pin is clamped in the limiting pin hole.

Further, a second chute is arranged on the base and/or the middle cover, and the sliding block is slidably assembled in the second chute.

Further, a through hole penetrating into the lower cavity is formed in the side wall of the base, and an auxiliary impact piece corresponding to the through hole is further arranged on the sliding block.

Further, two spacing buffer parts which are arranged at intervals are arranged on the middle cover or the base, and the auxiliary impact part is positioned between the two spacing buffer parts.

Further, the movable contact group on the sliding beam comprises a contact roller group and a compression spring, wherein the contact roller group can be arranged on the sliding beam in a lifting and moving mode in a certain range, and the contact roller group comprises two rows of rollers which are arranged at intervals up and down; the compression spring is arranged above the contact roller group and is abutted on the sliding beam.

The technical scheme provided by the utility model has the following beneficial effects:

1. the shell is provided with an upper cavity and a lower cavity which are isolated from each other, the contact system is arranged in the upper cavity, the operating mechanism and the sliding block are arranged in the lower cavity, the layered design is realized, the structural layout in the upper cavity and the structural layout in the lower cavity are not influenced, the contact system does not need to give way to the operating mechanism, the contact system has enough space layout, and the structures of the parts such as a contact knife, a movable contact and the like can be unified, so that the types of the parts are reduced; the on/off state of the contact system in the upper chamber can be visually and clearly confirmed through the transparent upper cover without dead angles.

2. The upper cavity and the lower cavity are isolated, the mechanism bin (i.e. the lower cavity for placing the operating mechanism) is safely isolated from the electric bin (i.e. the upper cavity for placing the contact system), a through hole communicated with the lower cavity can be arranged on the base, the through hole is used for installing an auxiliary switch, the contact system in the upper cavity cannot be influenced, external water vapor/dust enters the lower cavity and is not easy to cause functional damage of the contact system, and electric arcs of the upper cavity are not easy to leak from the lower cavity and the through hole, so that the requirement on blocking of the through hole is low, the assembly requirement on the rubber plug is reduced by blocking the rubber plug when the auxiliary switch is not used, and the universality is good; the customer can install the auxiliary switch by himself at any time.

Drawings

FIG. 1 is a schematic perspective view of a double-layer visual disconnecting switch according to the first embodiment;

FIG. 2 is a partially exploded view of a double-layered visual isolating switch according to the first embodiment;

FIG. 3 is a top view of a two-layer visual disconnector according to a first embodiment;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 3;

FIG. 6 is a schematic view showing the internal structure of the upper chamber in the first embodiment;

FIG. 7 is a schematic view showing the internal structure of the lower chamber in the first embodiment;

FIG. 8 is a schematic view showing the structure of a base in the first embodiment;

FIG. 9 is a schematic view showing the structure of a middle cap in the first embodiment;

FIG. 10 is a schematic diagram showing a second structure of the middle cap in the first embodiment;

FIG. 11 is a schematic view showing the structure of a transparent upper cover according to the first embodiment;

FIG. 12 is a top view of a two-layer visual disconnector according to a second embodiment;

fig. 13 is a cross-sectional view of a double-layer visual disconnector in a third embodiment.

Detailed Description

For further illustration of the various embodiments, the utility model is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present utility model. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.

The utility model will now be further described with reference to the drawings and detailed description.

Example 1

Referring to fig. 1 to 11, the present embodiment provides a double-layer visual isolating switch, which includes a housing 10, and an operating mechanism 20, a slider 30 and a contact system disposed in the housing 10; the shell 10 comprises a base 11, a middle cover 12 and a transparent upper cover 13 which are sequentially covered, wherein the base 11 and the middle cover 12 are enclosed to form a lower cavity 101, and the middle cover 12 and the transparent upper cover 13 are enclosed to form an upper cavity 102; in this way, the upper chamber 102 and the lower chamber 101 are disposed apart from each other.

The contact system is assembled in the upper chamber 102, so that the state of the contact system in the upper chamber 102 can be visually and clearly confirmed without dead angle by the transparent upper cover 13.

Specifically, the contact system comprises a sliding beam 41 with a movable contact group 42 and a contact knife group, wherein the contact knife group comprises contact knives 43 symmetrically arranged at two sides of the sliding beam 41, and the contact knives 43 extend outwards to the outside of the shell 10 for wiring; the sliding of the sliding beam 41 makes the movable contact group 42 contact the contact blades 43 at two sides to realize closing or separating from the contact blades 43 at two sides to realize opening.

The operating mechanism 20 is in driving connection with the sliding block 30 and is assembled in the lower chamber 101 together, the sliding block 30 passes through the middle cover 12 and is connected with the sliding beam 41, the operating mechanism 20 drives the sliding beam 41 to slide through the sliding block 30, and then the moving contact group 42 on the sliding beam 41 is controlled to contact or separate from the two contact blades 43 of the contact blade group.

By adopting the double-layer visual isolating switch, the shell 10 is provided with the upper cavity 102 and the lower cavity 101 which are isolated, the contact system is arranged in the upper cavity 102, the operating mechanism 20 and the sliding block 30 are arranged in the lower cavity 101, the layered design is realized, the structural layout in the upper cavity 102 and the lower cavity 101 is not affected, the contact system does not need to give way to the operating mechanism 20, the contact system has enough space layout, the structures of the contact knife 43, the movable contact group 42 and other components can be unified, and the variety of parts is reduced; the on/off state of the contact system in the upper chamber 102 can be visually, clearly and dead-angle-free through the transparent upper cover 13.

Meanwhile, due to the isolation design of the upper chamber 102 and the lower chamber 101, the mechanism cabin (namely the lower chamber 101 for placing the operating mechanism 20) is safely isolated from the electric cabin (namely the upper chamber 102 for placing the contact system), through holes (such as through holes 112 for installing the auxiliary switch 40 in the following) can be formed on the base 11 at will, the through holes 112 formed in the base 11 are communicated with the lower chamber 101, the contact system in the upper chamber 102 cannot be influenced, external water vapor/dust enters the lower chamber 101 and is not easy to cause functional damage of the contact system, and electric arcs generated by the contact system of the upper chamber 102 are not easy to leak from passing through the lower chamber 101 and the through holes 112, so that the plugging requirement on the through holes 112 is low, the assembly requirement of the rubber plug and the through holes 112 is reduced when the auxiliary switch 40 is not used, and the universality of the isolating switch is better; the customer can choose whether to install the auxiliary switch 40, when installing the auxiliary switch 40, the auxiliary switch 40 is installed, when the auxiliary switch 40 is not needed to be equipped, the auxiliary switch 40 is detached, the rubber plug is plugged into the through hole 112, and the auxiliary switch 40 can be installed at any time.

Further, in this embodiment, the operating mechanism 20 is an energy-storing operating mechanism, which has an energy-storing spring 22 and a driving shaft 21 for driving the energy-storing spring 22 to store energy, the first end of the driving shaft 21 is located in the lower chamber 101, the second end of the driving shaft 21 sequentially passes through the middle cover 12 and the transparent upper cover 13 to extend out of the transparent upper cover 13, the second end of the driving shaft 21 extending out of the transparent upper cover 13 is provided with a handle 26, and during opening and closing operations, the driving shaft 21 is driven to rotate by rotating the handle 26, and during the rotation of the driving shaft 21, the energy-storing spring 22 is compressed, so that the energy-storing spring 22 stores energy, and after the energy storage is completed, the elastic force is released as a driving force for pushing the sliding block 30 and the sliding beam 41 to slide, and finally the opening and closing operations are completed.

The driving rotating shaft 21 is also sleeved with a sealing sleeve ring 27 and an indication sleeve ring 28 with an indication arrow, and the sealing sleeve ring 27 is in sealing fit in a fit gap between the driving rotating shaft 21 and the middle cover 12 so as to ensure sealing isolation between the upper cavity 102 and the lower cavity 101. The indication collar 28 is in sealing fit in a fit gap between the driving rotating shaft 21 and the transparent upper cover 13, so that sealing isolation between the upper chamber 101 and the external environment is realized, and meanwhile, the indication collar 28 can well indicate the opening and closing state of the operating mechanism 20 along with rotation of the driving rotating shaft 21, so that an operator can clearly confirm the state of the operating mechanism 20.

Specifically, the operating mechanism 20 further comprises a first swing arm 23 and a second swing arm 24, the first swing arm 23 is fixed at a first end of the driving rotating shaft 21, the first end of the second swing arm 24 is rotatably assembled between the base 11 and the middle cover 12, the energy storage spring 22 is sleeved on the second swing arm 24, a connecting shaft 25 is arranged at the tail end of the first swing arm 23, and the connecting shaft 25 is arranged on a second end of the second swing arm 24 and the sliding block 30 in a penetrating manner, so that the layout of the operating mechanism 20 is realized. Of course, in other embodiments, the operating mechanism 20 may also employ other prior art energy storage operating mechanisms, such as the energy storage spring operating mechanism of the low voltage isolation switch disclosed in CN201611262203.3, and the like. Meanwhile, the driving shaft 21 may not pass through the upper chamber 102, for example, a transmission mechanism (such as gear transmission) in transmission connection with the driving shaft 21 is disposed at the side of the base 11, and then the handle 26 is disposed at the side of the base 11 and connected with the transmission mechanism.

The upper surface of the middle cover 12 facing the upper chamber 102 is provided with a first sliding groove 121 and a through window 122 positioned in the first sliding groove 121, the sliding beam 41 is slidably assembled in the first sliding groove 121 and covers the through window 122, the sliding block 30 is provided with a clamping head 31, and the clamping head 31 passes through the through window 122 and is fixedly clamped on the sliding beam 41. The arrangement meets the sliding guide arrangement of the sliding beam 41 and the connection of the sliding beam 41 and the sliding block 30, and meanwhile, the through window 122 is covered and blocked through the sliding beam 41, so that the isolation between the upper cavity 102 and the lower cavity 101 is ensured, and the structural design is ingenious. Of course, in other embodiments, for example, a skin with elasticity may be covered on the through window 122 in a sealing manner, the clamping connector 31 of the slider 30 is penetrated on the skin in a sealing manner, and the movement of the clamping connector 31 is matched through the elastic expansion and contraction of the skin, so that the upper chamber 102 and the lower chamber 101 can be effectively isolated.

The middle cover 12 is formed with a partition 123 at two sides of the first chute 121, the partition 123 is also abutted against the side surface of the sliding beam 41, and the partition 123 is arranged to limit and guide the sliding beam 41 further to prevent the sliding beam 41 from dislocating, so that the partition 123 also partitions the upper chamber 102 into a plurality of isolation spaces; the contact knife groups are provided with a plurality of groups, and the contact knives 43 of the adjacent contact knife groups are isolated by a partition plate 123; therefore, the matching of each group of movable contact groups 42 and the contact blades 43 is isolated independently, the electric arc is prevented from moving, and the stability is better. Meanwhile, an arc extinguishing chamber 44 is also provided beside each contact blade 43 for effective arc extinguishing.

Specifically, the transparent upper cover 13 is also provided with a chute 131, the upper end of the sliding beam 41 is slidably assembled in the chute 131 of the transparent upper cover 13, and the sliding stability of the sliding beam 41 is better.

Two spacing buffer blocks 51 which are arranged at intervals are fixed on the middle cover 12, spacing convex parts 411 are arranged on the sliding beams 41, the spacing convex parts 411 are positioned between the two spacing buffer blocks 51, the sliding limiting effect on the sliding beams 41 is achieved, the excessive sliding of the sliding beams 41 is prevented, meanwhile, the buffering effect is also achieved, and the collision damage caused by the excessive force when the sliding beams 41 slide is prevented.

The sliding beam 41 is further provided with an elastic pin 45, the transparent upper cover 13 is provided with a limit pin hole 132, and when the sliding beam 41 slides to the opening position, the elastic pin 45 is clamped in the limit pin hole 132, so that the sliding beam 41 can be ensured to be positioned at the opening position under the condition that no external force is applied, and the sliding beam 41 is prevented from being closed due to the sliding caused by the connection failure with the sliding block 30 and the like, thereby better ensuring the safety of maintenance personnel; when the handle 26 is rotated, the force applied by the operating mechanism 20 can disengage the elastic pin 45 from the limit pin hole 132 to achieve the closing operation of the slide beam 41.

Specifically, the movable contact group 42 on the sliding beam 41 includes a contact roller group 421 and a compression spring 422, the contact roller group 421 is disposed on the sliding beam 41 and can be lifted in a certain range, and the contact roller group 421 includes two rows of rollers disposed at an upper-lower interval; the compression spring 422 is arranged above the set of contact rollers 421 and abuts on the slide beam 41. So set up, when carrying out the closing operation, two rows of rollers are close to touch sword 43, and during the contact, touch sword 43 inserts between two rows of rollers, and the convex surface of roller has the guide effect, can be according to touch the adjustment position of the height self-adaptation of sword 43, finally with touch sword 43 centre gripping, forms electric connection, and the reliability is high.

The base 11 and the middle cover 12 are respectively provided with a second chute (a second chute 111 on the base 11 and a second chute 124 on the middle cover 12), the sliding blocks 30 are slidably assembled in the second chutes 111 and 124, and the base 11 and the middle cover 12 support, limit and guide the sliding blocks 30 together, so that the effect is good. Of course, in other embodiments, the second chute may be provided on the base 11 or the middle cover 12.

The through hole 112 penetrating into the lower chamber 101 is formed in the side wall of the base 11, the auxiliary striking member 32 corresponding to the through hole 112 is further arranged on the sliding block 30, the auxiliary switch 40 is arranged on the side wall of the base 10, the triggering end of the auxiliary switch 40 is arranged in the through hole 112, so that the through hole 112 is formed in the base 11 to be communicated with the lower chamber 101, the contact system in the upper chamber 102 is not affected, and the auxiliary striking member 32 is driven to trigger the auxiliary switch 40 or separate from the auxiliary switch 40 through the sliding of the closing or opening of the sliding block 30, so that the auxiliary switch 40 can accurately indicate the state of the operating mechanism 20. Of course, when the auxiliary switch 40 is not required, a sealing plug (i.e., a rubber plug) may be inserted into the through-hole 112 to block the through-hole 112. Of course, in other embodiments, the structure of the through hole 112 may not be provided.

Further, in this embodiment, two sides of the housing 10 are further provided with protection covers 14, and the protection covers 14 cover the contact knives 43 extending out of the housing 10, so as to play a role in isolation protection, and prevent personnel from touching the position of the electrical connection by mistake.

Example two

The two-layer visual isolating switch provided in this embodiment is substantially the same as the structure provided in the first embodiment, and is mainly different in that the setting position of the driving shaft is different, in this embodiment, the driving shaft 21 is disposed at the middle position of the housing 10, that is, the handle 26 is connected to the middle position of the housing 10 in fig. 12, and the driving shaft 21 is disposed at the left side of the housing 10 in the first embodiment, that is, the handle 26 is connected to the left side of the housing 10 in the first embodiment. The shapes of other components are different, but the connection relation and the operation mode are the same.

Example III

The structure of the double-layer visual isolating switch provided by the embodiment is approximately the same as that provided by the second embodiment, and the difference is that: in the present embodiment, the limit bumper 51 for limiting the slide beam 41 is not provided; instead, two spacing buffers 52 are provided on the middle cap 12 at intervals, and the auxiliary striker 32 is located between the two spacing buffers 52. That is, in the present embodiment, the limit of the slide beam 41 is achieved by limiting the auxiliary impact member 32 by the two limit buffers 52, the achieved effect is the same, and the limit structure is not required to be laid out in the upper chamber 102. Of course, in other embodiments, two limiting bumpers 52 may be provided on the base 11 to limit the secondary impact member 32.

While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (10)

1. A double-layer visual isolating switch comprises a shell, an operating mechanism, a sliding block and a contact system, wherein the operating mechanism, the sliding block and the contact system are arranged in the shell; the method is characterized in that: the shell comprises a base, a middle cover and a transparent upper cover which are sequentially covered, a lower cavity is formed by surrounding the base and the middle cover, and an upper cavity is formed by surrounding the middle cover and the transparent upper cover; the contact system is assembled in the upper cavity and comprises a sliding beam with a movable contact group and a contact knife group, wherein the contact knife group comprises contact knives symmetrically arranged on two sides of the sliding beam, and the contact knives extend outwards to the outside of the shell; the operating mechanism is in driving connection with the sliding block and is assembled in the lower cavity together, the sliding block penetrates through the middle cover and is connected with the sliding beam, and the operating mechanism drives the sliding beam to slide through the sliding block so as to control the contact or separation of the movable contact group on the sliding beam and the two contact knives of the contact knife group.

2. The double-layer visual isolating switch of claim 1, wherein: the operating mechanism is an energy storage type operating mechanism, the operating mechanism is provided with an energy storage spring and a driving rotating shaft for driving the energy storage spring to store energy, a first end of the driving rotating shaft is located in the lower cavity, a second end of the driving rotating shaft sequentially penetrates through the middle cover and the transparent upper cover to extend out of the transparent upper cover, a handle is assembled at a second end of the driving rotating shaft of the transparent upper cover, a sealing lantern ring and an indication lantern ring with an indication arrow are further sleeved on the driving rotating shaft, the sealing lantern ring is in sealing fit in a fit gap between the driving rotating shaft and the middle cover, and the indication lantern ring is in sealing fit in a fit gap between the driving rotating shaft and the transparent upper cover.

3. The double-layer visual isolating switch of claim 1, wherein: the upper surface of well lid towards upper chamber is provided with first spout and is located the through window of first spout, the smooth roof beam slidable assembly in first spout and cover the through window, be provided with the joint on the slider, the joint passes through the through window and fixed joint to smooth roof beam on.

4. A double-layer visual isolating switch as claimed in claim 3, in which: the middle cover is provided with a baffle plate at two sides of the first chute, and the baffle plate is also abutted against the side surface of the sliding beam; the touch knife groups are provided with a plurality of groups, and touch knives of adjacent touch knife groups are isolated by a partition plate; an arc extinguishing chamber is arranged beside each contact knife.

5. A double-layer visual isolating switch as claimed in claim 1 or 3, wherein: the middle cover is fixedly provided with two spacing buffer blocks which are arranged at intervals, the sliding beam is provided with spacing convex parts, and the spacing convex parts are positioned between the two spacing buffer blocks.

6. A double-layer visual isolating switch as claimed in claim 1 or 3, wherein: the sliding beam is further provided with an elastic pin, the transparent upper cover is provided with a limit pin hole, and when the sliding beam slides to the opening position, the elastic pin is clamped in the limit pin hole.

7. The double-layer visual isolating switch of claim 1, wherein: the base and/or the middle cover are/is provided with a second chute, and the sliding block is slidably assembled in the second chute.

8. The double-layer visual isolating switch of claim 1, wherein: the side wall of the base is provided with a through hole penetrating into the lower cavity, and the sliding block is also provided with an auxiliary impact piece corresponding to the through hole.

9. The double-layer visual isolating switch of claim 8, wherein: two spacing buffer parts which are arranged at intervals are arranged on the middle cover or the base, and the auxiliary impact part is positioned between the two spacing buffer parts.

10. The double-layer visual isolating switch of claim 1, wherein: the movable contact group on the sliding beam comprises a contact roller group and a compression spring, wherein the contact roller group can be arranged on the sliding beam in a lifting and moving mode in a certain range, and the contact roller group comprises two rows of rollers which are arranged at intervals up and down; the compression spring is arranged above the contact roller group and is abutted on the sliding beam.

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