A double-layer visual isolating switch

Abstract

The present invention provides a double-layer visual isolating switch, comprising a shell and an operating mechanism, a slider and a contact system arranged in the shell; the shell comprises a base, a middle cover and a transparent upper cover which are covered in sequence, the base and the middle cover enclose a lower chamber, and the middle cover and the transparent upper cover enclose an upper chamber; the contact system is arranged in the upper chamber, and the operating mechanism and the slider are arranged in the lower chamber, realizing a layered design, wherein the structural layouts in the upper chamber and the lower chamber do not affect each other, the contact system does not need to give way to the operating mechanism, and has sufficient space layout, and the structures of its contact blades, moving contacts and other components can be unified to reduce the number of parts; the status of the contact system in the upper chamber can be confirmed intuitively, clearly and without blind spots through the transparent upper cover.

Description

Technical Field

[0001] The present invention relates to the field of switchgear, in particular to the field of load isolating switches, and more particularly to a double-layer visual isolating switch. Background Art

[0002] The isolating switch has a certain connection and disconnection capability. It is a device that isolates the power-off part from the live part and creates an obvious disconnection point to isolate the faulty equipment or perform power outage maintenance. Existing load isolating switches are shown as the switch device for quickly disconnecting and closing the load isolating switch disclosed in CN200710195757.0. At present, the existing load isolating switches generally set the operating mechanism and the contact system in the same chamber of the shell. This method has the following disadvantages: 1. The structural layout is compact, and the operating mechanism needs to occupy a larger position. Therefore, in order to make room, the structure of the contact system needs to be rearranged, resulting in inconsistent structures such as the moving contacts and / or contact knives of the structural system, resulting in an increase in the types of parts used; 2. Even if the shell is made of transparent material, it is impossible to intuitively and accurately confirm the connection / disconnection status of the internal contact system, which can easily lead to misjudgment or difficulty in detecting abnormalities. 3. When installing an auxiliary switch on a product, a hole needs to be drilled in the housing to fit the switch. When the auxiliary switch is not needed, customers will seal the hole with a sealing plug (such as a rubber plug). However, this hole leads directly to the contact system. To prevent the external environment from affecting the electrical system inside the contact system and to prevent arc leakage when connecting or disconnecting load currents of different natures, the sealing fit between the rubber plug and the hole must be high. Even after assembly, the rubber plug will be flushed out by the air waves generated by the contact system, which is almost impossible to meet with existing products. If the sealing is insufficient, external moisture / dust will eventually enter the housing, causing functional damage to the contact system or arc leakage and combustion, leading to safety accidents. Therefore, customers need to clearly select whether the product comes with an auxiliary switch when purchasing. If the wrong order is made, the product will be returned. Summary of the Invention

[0003] Therefore, in order to solve the above problems, the present invention provides a double-layer visual isolating switch.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A double-layer visual isolating switch comprises a shell and an operating mechanism, a slider and a contact system arranged in the shell; the shell comprises a base, a middle cover and a transparent upper cover which are covered in sequence, the base and the middle cover enclose a lower chamber, and the middle cover and the transparent upper cover enclose an upper chamber; the contact system is assembled in the upper chamber, the contact system comprises a sliding beam with a moving contact group and a contact knife group, the contact knife group comprises contact knives symmetrically arranged on both sides of the sliding beam, and the contact knives extend outward from the shell; the operating mechanism drives the slider to be connected and assembled together in the lower chamber, the slider passes through the middle cover and is connected to the sliding beam, and the operating mechanism drives the sliding beam to slide through the slider, thereby controlling the moving contact group on the sliding beam and the two contact knives of the contact knife group to contact or separate.

[0006] Furthermore, the operating mechanism is an energy storage type operating mechanism, having an energy storage spring and a driving shaft that drives the energy storage spring to store energy. The first end of the driving shaft is located in the lower chamber, and its second end passes through the middle cover and the transparent upper cover in sequence to extend out of the transparent upper cover. The second end of the driving shaft extending out of the transparent upper cover is equipped with a handle. The driving shaft is also sleeved with a sealing ring and an indicator ring with an indicator arrow. The sealing ring is sealed in the fitting gap between the driving shaft and the middle cover, and the indicator ring is sealed in the fitting gap between the driving shaft and the transparent upper cover.

[0007] Furthermore, the upper surface of the middle cover facing the upper chamber is provided with a first slide groove and a through window located in the first slide groove, the sliding beam can be slidably assembled in the first slide groove and cover the through window, and the slider is provided with a card joint, which passes through the through window and is fixedly connected to the sliding beam.

[0008] Furthermore, the middle cover is formed with partitions on both sides of the first slide groove, and the partitions are also abutted against the side of the sliding beam; the contact knife groups are provided in multiple groups, and the contact knives of adjacent contact knife groups are isolated by partitions; an arc extinguishing chamber is also provided next to each contact knife.

[0009] Furthermore, two spaced-apart limiting buffer blocks are fixed on the middle cover, and a limiting convex portion is provided on the sliding beam, and the limiting convex portion is located between the two spaced-apart limiting buffer blocks.

[0010] Furthermore, an elastic pin is provided on the sliding beam, and a limit pin hole is provided on the transparent upper cover. When the sliding beam slides to the opening position, the elastic pin is engaged in the limit pin hole.

[0011] Furthermore, a second sliding groove is provided on the base and / or the middle cover, and the slider can be slidably assembled in the second sliding groove.

[0012] Furthermore, a through hole is provided on the side wall of the base and passes through to the lower chamber, and an auxiliary impact member corresponding to the through hole is also provided on the slider.

[0013] Furthermore, two spaced-apart limiting buffer members are provided on the middle cover or the base, and the auxiliary impact member is located between the two spaced-apart limiting buffer members.

[0014] Furthermore, the moving contact group on the sliding beam includes a contact roller group and a compression spring. The contact roller group is arranged on the sliding beam and can be raised and lowered within a certain range. The contact roller group includes two rows of rollers spaced apart in an upper and lower manner; the compression spring is arranged above the contact roller group and abuts against the sliding beam.

[0015] The technical solution provided by the present invention has the following beneficial effects:

[0016] 1. The housing is provided with an isolated upper chamber and a lower chamber, the contact system is arranged in the upper chamber, and the operating mechanism and the slider are arranged in the lower chamber, realizing a layered design. The structural layouts in the upper chamber and the lower chamber do not affect each other. The contact system does not need to give way to the operating mechanism, and has sufficient space layout. The structures of its contact blades, moving contacts and other components can be unified to reduce the number of parts. The on / off status of the contact system in the upper chamber can be confirmed intuitively, clearly and without blind spots through the transparent upper cover.

[0017] 2. The isolation design of the upper chamber and the lower chamber ensures safe isolation between the mechanism compartment (i.e., the lower chamber where the operating mechanism is placed) and the electrical compartment (i.e., the upper chamber where the contact system is placed). A through-hole connecting to the lower chamber can be optionally opened on the base. This through-hole is used to install an auxiliary switch and will not affect the contact system in the upper chamber. External moisture / dust entering the lower chamber is unlikely to cause functional damage to the contact system, and the arc in the upper chamber is unlikely to leak out through the lower chamber and the through-hole. Therefore, the sealing requirements for the through-hole are low. When the auxiliary switch is not in use, it is plugged with a rubber plug, which reduces the assembly requirements for the rubber plug and has good versatility. Customers can install the auxiliary switch themselves at any time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a three-dimensional schematic diagram of a double-layer visual disconnect switch in Example 1;

[0019] Figure 2 The figure shows a partial structural decomposition diagram of the double-layer visual isolating switch in the first embodiment;

[0020] Figure 3 Shown is a top view of the double-layer visual disconnector in Example 1;

[0021] Figure 4 Shown Figure 3 Cross-sectional view along line AA;

[0022] Figure 5 Shown Figure 3Cross-sectional view along the midline BB;

[0023] Figure 6 The figure shows the internal structure of the upper chamber in the first embodiment;

[0024] Figure 7 The figure shows the internal structure of the lower chamber in the first embodiment;

[0025] Figure 8 Shown is a schematic structural diagram of the base in Example 1;

[0026] Figure 9 The diagram shows the structure of the middle cover in the first embodiment. Figure 1 ;

[0027] Figure 10 The diagram shows the structure of the middle cover in the first embodiment. Figure 2 ;

[0028] Figure 11 Shown is a schematic structural diagram of the transparent upper cover in Example 1;

[0029] Figure 12 Shown is a top view of the double-layer visual disconnector in Example 2;

[0030] Figure 13 Shown is a cross-sectional view of the double-layer visual isolating switch in Example 3. DETAILED DESCRIPTION

[0031] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the present disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, one of ordinary skill in the art will understand other possible embodiments and the advantages of the present invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0032] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] Reference Figures 1 to 11 As shown, this embodiment provides a double-layer visual isolating switch, including a shell 10 and an operating mechanism 20, a slider 30 and a contact system arranged in the shell 10; the shell 10 includes a base 11, a middle cover 12 and a transparent upper cover 13 covered in sequence, the base 11 and the middle cover 12 enclose a lower chamber 101, and the middle cover 12 and the transparent upper cover 13 enclose an upper chamber 102; in this way, the upper chamber 102 and the lower chamber 101 are isolated from each other.

[0035] The contact system is assembled in the upper chamber 102 , so that the status of the contact system in the upper chamber 102 can be confirmed intuitively, clearly and without blind spots through the transparent upper cover 13 .

[0036] Specifically, the contact system includes a sliding beam 41 with a moving contact group 42 and a contact knife group. The contact knife group includes contact knives 43 symmetrically arranged on both sides of the sliding beam 41. The contact knives 43 extend outward to the outside of the shell 10 for wiring. The sliding of the sliding beam 41 causes the moving contact group 42 on it to contact the contact knives 43 on both sides to achieve closing or separate from the contact knives 43 on both sides to achieve opening.

[0037] The operating mechanism 20 drives and connects the slider 30 and is assembled together in the lower chamber 101. The slider 30 passes through the middle cover 12 and is connected to the sliding beam 41. The operating mechanism 20 drives the sliding beam 41 to slide through the slider 30, thereby controlling the contact or separation between the moving contact group 42 on the sliding beam 41 and the two contact knives 43 of the contact knife group.

[0038] The above-mentioned double-layer visual isolating switch is adopted, and the shell 10 is provided with an isolated upper chamber 102 and a lower chamber 101, the contact system is arranged in the upper chamber 102, and the operating mechanism 20 and the slider 30 are arranged in the lower chamber 101, realizing a layered design. The structural layouts in the upper chamber 102 and the lower chamber 101 do not affect each other. The contact system does not need to give way to the operating mechanism 20, and has sufficient space layout. The structures of its contact blade 43, moving contact group 42 and other components can be unified to reduce the types of parts; the transparent upper cover 13 can be used to intuitively, clearly and without blind spots to confirm the on / off status of the contact system in the upper chamber 102.

[0039] At the same time, the isolation design of the upper chamber 102 and the lower chamber 101, the mechanism compartment (i.e. the lower chamber 101 where the operating mechanism 20 is placed) and the electrical compartment (i.e. the upper chamber 102 where the contact system is placed) are safely isolated, and a through hole can be opened on the base 11 at will (such as the through hole 112 for installing the auxiliary switch 40 described below), and the through hole 112 opened on the base 11 is connected to the lower chamber 101, which will not affect the contact system in the upper chamber 102, and external moisture / dust entering the lower chamber 101 is not likely to cause functional damage to the contact system, and the connection of the upper chamber 102 is safe. The arc generated by the contact system is not easy to leak out through the lower chamber 101 and the through hole 112, so the sealing requirements for the through hole 112 are low. When the auxiliary switch 40 is not in use, it is plugged with a rubber plug, which reduces the assembly requirements of the rubber plug and the through hole 112, making the isolating switch more versatile; 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, the auxiliary switch 40 is removed and the rubber plug is plugged into the through hole 112. The auxiliary switch 40 can be installed by the customer at any time.

[0040] Furthermore, in this embodiment, the operating mechanism 20 is an energy storage type operating mechanism, having an energy storage spring 22 and a driving shaft 21 that drives the energy storage spring 22 to store energy. The first end of the driving shaft 21 is located in the lower chamber 101, and its second end passes through the middle cover 12 and the transparent upper cover 13 in sequence 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 equipped with a handle 26. During the opening and closing operations, the driving shaft 21 is driven to rotate by rotating the handle 26. During the rotation of the driving shaft 21, the energy storage spring 22 will be compressed, thereby causing the energy storage spring 22 to store energy. When the energy storage is completed, the elastic force is released as the driving force to push the slider 30 and the sliding beam 41 to slide, thereby finally completing the opening or closing operation.

[0041] The drive shaft 21 is also sleeved with a sealing collar 27 and an indicator collar 28 with an indicator arrow. The sealing collar 27 is sealed within the clearance between the drive shaft 21 and the middle cover 12 to ensure sealed isolation between the upper chamber 102 and the lower chamber 101. The indicator collar 28 is sealed within the clearance between the drive shaft 21 and the transparent upper cover 13 to achieve sealed isolation between the upper chamber 101 and the external environment. At the same time, the indicator collar 28 can effectively indicate the open and closed status of the operating mechanism 20 as the drive shaft 21 rotates, allowing the operator to clearly confirm the status of the operating mechanism 20.

[0042] Specifically, the operating mechanism 20 also includes a first swing arm 23 and a second swing arm 24. The first swing arm 23 is fixed to the first end of the drive 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. The end of the first swing arm 23 is provided with a connecting shaft 25. The connecting shaft 25 is passed through the second end of the second swing arm 24 and the slider 30. In this way, the layout of the operating mechanism 20 is realized. Of course, in other embodiments, the operating mechanism 20 can also adopt other energy storage operating mechanisms in the prior art, such as the energy storage spring operating mechanism of the low-voltage disconnector disclosed in CN201611262203.3. At the same time, the drive shaft 21 does not need to pass through the upper chamber 102. For example, a transmission mechanism (such as a gear transmission) that is connected to the drive shaft 21 is provided on the side of the base 11, and then the handle 26 is provided on the side of the base 11 and connected to the transmission mechanism.

[0043] The upper surface of the middle cover 12 facing the upper chamber 102 is provided with a first slide groove 121 and a through-window 122 within the first slide groove 121. The sliding beam 41 is slidably assembled within the first slide groove 121 and covers the through-window 122. The slider 30 is provided with a clamping joint 31 that passes through the through-window 122 and is fixedly clamped to the sliding beam 41. This arrangement satisfies the sliding guide arrangement of the sliding beam 41 and the connection between the sliding beam 41 and the slider 30. At the same time, the sliding beam 41 itself covers and blocks the through-window 122, ensuring the isolation of the upper chamber 102 from the lower chamber 101, resulting in a clever structural design. Of course, other embodiments are not limited to this. For example, the through-window 122 can be sealed with an elastic rubber cover, and the clamping joint 31 of the slider 30 can be sealed through the rubber cover. The elastic expansion and contraction of the rubber cover can coordinate the movement of the clamping joint 31, thereby effectively isolating the upper chamber 102 from the lower chamber 101.

[0044] The middle cover 12 is formed with partitions 123 on either side of the first slide slot 121. These partitions 123 also abut the sides of the slide beam 41. The partitions 123 not only further limit and guide the slide beam 41, preventing it from dislodging, but also conveniently divide the upper chamber 102 into multiple isolated spaces. Multiple contact blade groups are provided, with the blades 43 of adjacent contact blade groups separated by partitions 123. This ensures that the coordination between each set of moving contacts 42 and blades 43 is individually isolated, preventing arc sway and improving stability. Furthermore, an arc extinguishing chamber 44 is provided next to each blade 43 for effective arc extinguishing.

[0045] Specifically, the transparent upper cover 13 is also provided with a slide groove 131 , and the upper end of the slide beam 41 can be slidably assembled in the slide groove 131 of the transparent upper cover 13 , so that the sliding stability of the slide beam 41 is better.

[0046] Two spaced-apart limiting buffer blocks 51 are fixed on the middle cover 12, and a limiting protrusion 411 is provided on the sliding beam 41. The limiting protrusion 411 is located between the two limiting buffer blocks 51, which serves to limit the sliding of the sliding beam 41 and prevent the sliding beam 41 from sliding excessively. It also serves as a buffer to prevent the sliding beam 41 from sliding with excessive force and causing collision damage.

[0047] An elastic pin 45 is also provided on the sliding beam 41, and a limit pin hole 132 is provided on the transparent upper cover 13. When the sliding beam 41 slides to the opening position, the elastic pin 45 is engaged in the limit pin hole 132. In this way, when no external force is applied, the sliding beam 41 can be ensured to be in the opening position, preventing the sliding beam 41 from sliding due to failure of the connection with the slider 30 and causing closing, thereby better ensuring the safety of maintenance personnel; when the handle 26 is rotated, the force applied by the operating mechanism 20 can make the elastic pin 45 disengage from the limit pin hole 132 to realize the closing operation of the sliding beam 41.

[0048] Specifically, the movable contact assembly 42 on the slide beam 41 includes a contact roller assembly 421 and a compression spring 422. The contact roller assembly 421 is mounted on the slide beam 41 and can be raised and lowered within a certain range. The contact roller assembly 421 comprises two rows of rollers spaced apart from one another. The compression spring 422 is positioned above the contact roller assembly 421 and abuts against the slide beam 41. With this arrangement, during the closing operation, the two rows of rollers approach the contact blade 43. When contact is made, the contact blade 43 is inserted between the two rows of rollers. The arc-shaped surfaces of the rollers act as guides, adaptively adjusting their position according to the height of the contact blade 43, ultimately clamping the contact blade 43 and establishing an electrical connection, resulting in high reliability.

[0049] The base 11 and the middle cover 12 are both provided with second chute grooves (the second chute groove 111 on the base 11 and the second chute groove 124 on the middle cover 12). The slider 30 is slidably assembled in the second chute grooves 111 and 124. The base 11 and the middle cover 12 jointly support, limit, and guide the slider 30, which is effective. Of course, in other embodiments, the second chute can also be provided on the base 11 or the middle cover 12.

[0050] A through hole 112 is provided on the side wall of the base 11, which passes through the lower chamber 101. The slider 30 is also provided with an auxiliary striker 32 corresponding to the through hole 112. An auxiliary switch 40 is provided on the side wall of the base 10, and the trigger end of the auxiliary switch 40 is provided in the through hole 112. In this way, the through hole 112 is provided on the base 11 to connect with the lower chamber 101, which will not affect the contact system in the upper chamber 102. The auxiliary striker 32 is driven to trigger or disengage the auxiliary switch 40 by sliding the slider 30 to close or open the switch, so that the auxiliary switch 40 can accurately indicate the status of the operating mechanism 20. Of course, when the auxiliary switch 40 is not needed, a sealing plug (i.e., a rubber plug) can be inserted into the through hole 112 to seal the through hole 112. Of course, in other embodiments, the structure of the through hole 112 can also be omitted.

[0051] Furthermore, in this embodiment, protective covers 14 are provided on both sides of the housing 10, and the protective covers 14 cover the contact blades 43 extending out of the housing 10 to play an isolation and protection role, preventing people from accidentally touching the electrical connection position.

[0052] Example 2

[0053] The double-layer visual isolating switch provided in this embodiment has a structure similar to that provided in the first embodiment. The main difference is that the drive shaft is set at a different position. In this embodiment, the drive shaft 21 is set at the middle position of the housing 10, that is, Figure 12 The middle handle 26 is connected to the middle position of the housing 10, while the driving shaft 21 in the first embodiment is arranged at the left side of the housing 10, that is, the handle 26 in the first embodiment is connected to the left side of the housing 10. There are differences in the shapes of other components, but the connection relationship and operation method are the same.

[0054] Example 3

[0055] The double-layer visual isolating switch provided in this embodiment has a structure substantially the same as that provided in the second embodiment, with the difference being that in this embodiment, there is no limiting buffer block 51 for limiting the sliding beam 41; instead, two limiting buffer members 52 are provided at intervals on the middle cover 12, and the auxiliary impact member 32 is located between the two limiting buffer members 52. That is, in this embodiment, the two limiting buffer members 52 limit the auxiliary impact member 32 to achieve the limiting of the sliding beam 41, and the effect achieved is the same, and there is no need to arrange a limiting structure in the upper chamber 102. Of course, in other embodiments, the two limiting buffer members 52 can also be provided on the base 11 to limit the auxiliary impact member 32.

[0056] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A double-layer visual disconnect switch, comprising a housing, an operating mechanism, a slider, and a contact system disposed within the housing; characterized in that: The housing includes a base, a middle cover, and a transparent upper cover that are sequentially covered. The base and the middle cover enclose a lower chamber, and the middle cover and the transparent upper cover enclose an upper chamber. The contact system is assembled in the upper chamber. The contact system includes a sliding beam with a movable contact group and a contact blade group. The contact blade group includes contact blades symmetrically arranged on both sides of the sliding beam, and the contact blades extend outward from the housing. The operating mechanism drives and connects to the slider and is assembled together in the lower chamber. The slider passes through the middle cover and is connected to the sliding beam. The operating mechanism drives the sliding beam to slide via the slider, thereby controlling the movable contact group on the sliding beam to contact or separate with the two contact blades of the contact blade group. The upper surface of the middle cover facing the upper chamber is provided with a first slide groove and a through window located in the first slide groove, the sliding beam is slidably assembled in the first slide groove and covers the through window, and the slider is provided with a clamping joint, which passes through the through window and is fixedly clamped to the sliding beam; The middle cover is formed with partitions on both sides of the first slide groove, and the partitions are also in contact with the side surfaces of the slide beam; the contact blade groups are provided in multiple groups, and the contact blades of adjacent contact blade groups are separated by partitions; an arc extinguishing chamber is also provided next to each contact blade; The sliding beam is further provided with an elastic pin, and the transparent upper cover is provided with a limit pin hole. When the sliding beam slides to the opening position, the elastic pin is clamped in the limit pin hole.

2. The double-layer visual disconnector according to claim 1, characterized in that: The operating mechanism is an energy storage type operating mechanism, which has an energy storage spring and a driving shaft that drives the energy storage spring to store energy. The first end of the driving shaft is located in the lower chamber, and the second end thereof passes through the middle cover and the transparent upper cover in sequence to extend out of the transparent upper cover. The second end of the driving shaft extending out of the transparent upper cover is equipped with a handle. A sealing ring and an indicator ring with an indicator arrow are also sleeved on the driving shaft. The sealing ring is sealed in the fitting gap between the driving shaft and the middle cover, and the indicator ring is sealed in the fitting gap between the driving shaft and the transparent upper cover.

3. The double-layer visual disconnector according to claim 1, characterized in that: Two spaced-apart limiting buffer blocks are fixed on the middle cover, and a limiting convex portion is provided on the sliding beam, wherein the limiting convex portion is located between the two spaced-apart limiting buffer blocks.

4. The double-layer visual disconnector according to claim 1, characterized in that: The base and / or the middle cover are provided with a second sliding groove, and the slider is slidably assembled in the second sliding groove.

5. The double-layer visual disconnector according to claim 1, characterized in that: A through hole is provided on the side wall of the base, which passes through to the lower chamber, and an auxiliary impact piece corresponding to the through hole is also provided on the slider.

6. The double-layer visual disconnector according to claim 5, characterized in that: The middle cover or the base is provided with two spaced-apart limiting buffer members, and the auxiliary impact member is located between the two limiting buffer members.

7. The double-layer visual disconnector according to claim 1, characterized in that: The moving contact group on the sliding beam includes a contact roller group and a compression spring. The contact roller group is arranged on the sliding beam and can be raised and lowered within a certain range. The contact roller group includes two rows of rollers spaced apart in an upper and lower manner; the compression spring is arranged above the contact roller group and abuts against the sliding beam.

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