A mobile switch cabinet bracket device

Abstract

The present invention relates to a mobile switch cabinet bracket device and relates to the technical field of switch cabinet brackets, comprising a switch cabinet, wherein the bottom of the switch cabinet is fixedly connected to the bracket through a cover plate, and the cover plate is fixedly connected to the switch cabinet, and the bottom of the bracket is provided with universal wheels in a rectangular array, and the bracket includes a bottom bracket fixedly connected to the cover plate, and a shaft rod mounting hole for a driving support rod and a belt placement groove for placing a toothed belt are opened on the side of the bracket close to the cover plate; a lifting bracket that can be raised and lowered is provided at the bottom of the bracket, and a driving support rod for transmission is provided between the bracket and the lifting bracket, and the lifting and lowering of the lifting bracket is controlled by the driving support rod, thereby reducing the bearing pressure of the universal wheel, thereby preventing damage caused by long-term stress between the bracket and the universal wheel, and a plurality of driving support rods are provided in a rectangular array at the bottom of the bracket, so that the load on the bracket will be evenly distributed to each driving support rod, thereby improving the load-bearing performance of the switch cabinet bracket and extending the service life.

Description

Technical Field

[0001] The present invention relates to the technical field of switch cabinet brackets, and in particular to a mobile switch cabinet bracket device. Background Art

[0002] Switchgear is an electrical equipment mainly used in power generation, transmission, distribution and power conversion of power systems. Switchgear can effectively control the equipment in the power system. By operating the switch, it can realize the on-off control of the circuit, thereby meeting the operation requirements of different equipment.

[0003] In order to prevent moisture from the bottom from entering the switch cabinet, a bracket is generally installed at the bottom of the switch cabinet, and some brackets are also installed with universal wheels at the bottom of the bracket to facilitate small-range movement of the switch cabinet, and the switch cabinet is moved by the universal wheels.

[0004] At present, most brackets need to have extremely strong load-bearing performance, so general brackets are made of metal materials such as channel steel or I-beam. Combined with the weight of the switch cabinet, the weight of the bracket and the switch cabinet will be concentrated at the connection between the moving wheel and the bracket, and most of the connections are movable connections. As the use time increases, the connection between the moving wheel and the bracket is prone to deformation, resulting in immobility. Severe damage to the moving wheel will also cause the bracket to tilt, causing the switch cabinet to tilt and cause safety accidents. Although some brackets without moving wheels will not have this problem, moving the switch cabinet requires a large number of workers to move it, which takes a lot of time, and manual movement is impossible in some small spaces, which makes it more difficult to move the switch cabinet. Summary of the Invention

[0005] Technical problems to be solved

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, meet practical needs, and provide a mobile switch cabinet bracket device to solve the above technical problems.

[0007] Technical Solution

[0008] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is:

[0009] A mobile switch cabinet bracket device includes a switch cabinet, wherein the bottom of the switch cabinet is fixedly connected to the bracket via a cover plate, and the cover plate is fixedly connected to the switch cabinet, the bottom of the bracket is provided with universal wheels in a rectangular array, the bracket includes a bottom support plate fixedly connected to the cover plate, and a shaft rod mounting hole for a drive support rod and a placement belt groove for placing a toothed belt are formed on a side of the bracket close to the cover plate, wherein the shaft rod mounting holes are distributed in a rectangular array, and each of the shaft rod mounting holes is connected to the placement belt groove;

[0010] The inner side of the bottom support plate is further provided with a steering cavity, and the steering cavity is communicated with both ends of the placement belt groove, wherein steering wheels are symmetrically installed in the steering cavity, and the steering wheels are movably connected to the bottom support plate through a pin shaft;

[0011] A toothed belt is placed in the belt placement groove, and the toothed belt passes around the outer side of the steering wheel when passing through the steering cavity. A mounting groove is also provided on the side of the bottom support plate, and the mounting groove is communicated with the side of the belt placement groove, and the mounting groove is located below the belt placement groove;

[0012] A positioning tooth is provided on the upper end of the side surface of the mounting groove, and a first thread is provided below the positioning tooth;

[0013] A driving support rod is installed in each of the shaft mounting holes, and the driving support rod has a support column movably connected to the shaft mounting hole, and an installation bearing is interference fit at one end of the support column close to the shaft mounting hole, and the outer ring of the installation bearing is interference fit with the shaft mounting hole;

[0014] The end of the support column passes through the shaft mounting hole and extends into the placement belt groove, and the end of the support column is fixedly connected to a synchronous pulley, and each of the synchronous pulleys is engaged with a toothed belt placed in the placement belt groove;

[0015] When the toothed belt moves, the toothed belt and the synchronous pulley engage with each other, causing the synchronous pulley to drive the support column to rotate. Since the support column is installed in the shaft mounting hole through the mounting bearing, the support column will rotate in the shaft mounting hole, and each synchronous pulley engages with the toothed belt, thereby driving multiple support columns to rotate simultaneously through the toothed belt;

[0016] A lifting support plate is provided below the driving support rod, and the lifting support plate has a center plate located in the middle position and edge plates located on both sides. The center plate and the edge plates are respectively located below the bottom support plate, and through holes corresponding to the support columns are also opened in the center plate and the edge plates.

[0017] As a further technical solution of the present invention, a threaded column is integrally provided at the bottom of each of the support columns, and a threaded sleeve is threadedly engaged with one end of each of the threaded columns away from the support column. The threaded sleeves are respectively fixed to the center plate and the edge plate in a rectangular array, and the mounting bearings correspond to the through holes on the center plate and the edge plate.

[0018] When the toothed belt drives multiple support columns to rotate simultaneously, the threaded column at the bottom of the support column cooperates with the threaded sleeve, and the threaded cooperation at the connection pushes the center plate and the edge plate to rise and fall at the same time. When descending, the lifting support plate and the driving support rod cooperate to lift the bracket until the universal wheel is separated from the ground, and the multiple driving support rods will evenly distribute the load on the bracket, thereby increasing the load-bearing performance of the switch cabinet bracket, and can also prevent damage to the connection between the universal wheel and the bracket.

[0019] As a further technical solution of the present invention, an adjusting turntable is movably connected in the mounting groove, and the adjusting turntable has an integrally arranged anti-skid turntable and a driving pulley, wherein the driving pulley is located above the anti-skid turntable, and the driving pulley and the toothed belt are meshed with each other, and a molded limit block is provided above the driving pulley, and the limit block is engaged with the toothed belt during the downward movement, and the anti-skid turntable is located below the toothed belt, and one side of the anti-skid turntable extends to the side of the bottom support plate;

[0020] A fastening base is slidably mounted on the bottom of the anti-slip turntable, and a second thread matching the first thread is provided on the inner wall of the fastening base. A positioning slot matching the positioning tooth is provided on the inner wall of the anti-slip turntable above the second thread. Sliding beads are mounted at symmetrical positions where the fastening base and the anti-slip turntable meet, and a spring is fixedly mounted at the center of the inner top of the anti-slip turntable.

[0021] Since the anti-slip turntable and the drive pulley are integrated into one unit, workers only need to rotate the anti-slip turntable. Through the mutual engagement of the drive pulley and the toothed belt, the toothed belt is driven to move on the inner side of the belt groove, thereby driving all the support columns to rotate synchronously. No separate adjustment is required, which saves a lot of time. In addition, when rotating the support columns, there is no need to remove the switch cabinet from above the bottom pallet, so it is more convenient for workers to move the switch cabinet.

[0022] As a further technical solution of the present invention, the upper portion of the driving pulley is movably connected to the cover plate via a bearing, the toothed belt is located below the cover plate, and the top of the steering wheel is movably connected to the cover plate via a pin shaft.

[0023] As a further technical solution of the present invention, the universal wheel is located between the center plate and the edge plate, and the universal wheel can rotate between the center plate and the edge plate.

[0024] (3) Beneficial effects:

[0025] A. In the present invention, a lifting support plate that can be raised and lowered is provided at the bottom of the bracket, and a driving rod for transmission is provided between the bracket and the lifting support plate. The driving rod is used to control the raising and lowering of the lifting support plate, reducing the bearing pressure of the universal wheel, thereby preventing damage caused by long-term stress between the bracket and the universal wheel. In addition, multiple driving rods are provided in a rectangular array at the bottom of the bracket, so the load on the bracket is evenly distributed to each driving rod, thereby improving the load-bearing capacity of the switchgear bracket and extending its service life.

[0026] B. In the present invention, since each support column is provided with a synchronous pulley at the end thereof, and each synchronous pulley is connected in series by a toothed belt, when the anti-slip turntable drives the drive pulley to rotate, the mutual engagement between the drive pulley and the toothed belt causes the multiple support columns to rotate simultaneously under the engagement of the toothed belt and the synchronous pulley, thereby ensuring the normal lifting of the lifting pallet, and the movement distance of each support column is the same, ensuring uniform distribution of the load on the bracket, and also facilitating workers to simultaneously control multiple drive rods;

[0027] C. In the present invention, a corresponding threaded sleeve is provided at the bottom of each support column. When the support column rotates, the threaded engagement between the support column and the threaded sleeve causes the center plate and the edge plates to rise or fall synchronously. When the switchgear is in use, the entire bracket can be lifted, preventing gravity from being applied to the connection between the universal wheel and the bracket for a long time. This prevents deformation and damage to the connection between the bracket and the universal wheel after long-term use, thereby extending the service life.

[0028] D. In the present invention, the operator presses down the anti-slip turntable so that the positioning slot is connected with the positioning tooth at the installation groove position. After reaching the bottom, the operator rotates the fastening base. At this time, the second thread on the inner wall of the fastening base is connected with the first thread at the installation groove position to fix it. At the same time, the driving pulley at the top of the anti-slip turntable moves downward synchronously, driving the limit block at its top to engage with the toothed belt, preventing the support column from falling due to the overall weight, thereby maintaining the current state. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0030] Figure 2 For the present invention Figure 1 Schematic diagram of the bottom structure;

[0031] Figure 3 For the present invention Figure 2 A partial enlarged schematic diagram;

[0032] Figure 4 Schematic diagram of the three-dimensional structure of the bracket in the present invention;

[0033] Figure 5 For the present invention Figure 4 A partial enlarged schematic diagram;

[0034] Figure 6 Schematic diagram of the position structure of the bracket, lifting support plate and toothed belt in the present invention;

[0035] Figure 7 For the present invention Figure 6 A partial enlarged schematic diagram;

[0036] Figure 8 For the present invention Figure 6 A partial enlarged schematic diagram;

[0037] Figure 9 Schematic diagram of the connection structure of the lifting support plate, universal wheel and driving support rod in the present invention;

[0038] Figure 10 For the present invention Figure 9 A partial enlarged schematic diagram;

[0039] Figure 11 It is a cross-sectional structural diagram of the anti-skid turntable in the present invention.

[0040] In the figure: incoming cabinet -1, control cabinet -2, outgoing cabinet -3, cover plate -4, bracket -5, bottom support plate -51, shaft mounting hole -52, placement belt groove -53, steering cavity -54, steering wheel -55, mounting groove -56, positioning tooth -57, first thread -58, lifting support plate -6, center plate -61, edge plate -62, threaded sleeve -63, universal wheel -7, toothed belt -8, adjustment turntable -9, anti-slip turntable -91, fastening base -910, second thread -911, positioning slot -912, sliding ball -913, spring -914, drive pulley -92, limit block -93, drive support rod -10, support column -101, threaded column -102, mounting bearing -103, synchronous pulley -104. DETAILED DESCRIPTION

[0041] See also Figure 1-11 , a mobile switch cabinet bracket device, including a switch cabinet, the bottom of the switch cabinet is fixedly connected to a bracket 5 through a cover plate 4, and the cover plate 4 is fixedly connected to the switch cabinet, the bottom of the bracket 5 is provided with a universal wheel 7 in a rectangular array, and the universal wheel 7 can be used to move the placement position of the switch cabinet in a small range, the bracket 5 includes a bottom support plate 51 fixedly connected to the cover plate 4, and the side of the bracket 5 close to the cover plate 4 is provided with a shaft rod mounting hole 52 for driving the support rod 10 and a placement belt groove 53 for placing the toothed belt 8, wherein the shaft rod mounting holes 52 are distributed in a rectangular array, each of the shaft rod mounting holes 52 is connected to the placement belt groove 53, and the shaft rod mounting holes 52 and the placement belt groove 53 are covered by the cover plate 4;

[0042] A steering cavity 54 is also provided on the inner side of the bottom support plate 51, and the steering cavity 54 is connected to both ends of the placement groove 53, wherein a steering wheel 55 is symmetrically installed in the steering cavity 54, and the steering wheel 55 is movably connected to the bottom support plate 51 through a pin shaft to ensure the normal rotation of the steering wheel 55 inside the steering cavity 54.

[0043] Furthermore, a toothed belt 8 is placed in the belt placement groove 53, and the toothed belt 8 bypasses the outer side of the steering wheel 55 when passing through the steering cavity 54. A mounting groove 56 is also provided on the side of the bottom support plate 51. The mounting groove 56 is connected to the side of the belt placement groove 53, and the mounting groove 56 is located below the belt placement groove 53. When the belt placement groove 53 moves, the toothed belt 8 will pass through each shaft mounting hole 52.

[0044] To be more specific, a driving support rod 10 is installed in each of the shaft mounting holes 52. The driving support rod 10 has a support column 101 movably connected to the shaft mounting hole 52, and an installation bearing 103 is interference fit at one end of the support column 101 close to the shaft mounting hole 52, and the outer ring of the installation bearing 103 is interference fit with the shaft mounting hole 52, so that the support column 101 can only rotate horizontally on the inner side of the shaft mounting hole 52. Since a cover plate 4 is installed on the top, the support column 101 can be prevented from moving up and down in the shaft mounting hole 52.

[0045] Furthermore, the end of the support column 101 passes through the shaft mounting hole 52 and extends into the placement belt groove 53, and the end of the support column 101 is fixedly connected to a synchronous pulley 104, and each of the synchronous pulleys 104 is engaged with the toothed belt 8 placed in the placement belt groove 53.

[0046] By adopting the above technical solution, when the toothed belt 8 moves, the toothed belt 8 and the synchronous pulley 104 are engaged with each other, so that the synchronous pulley 104 drives the support column 101 to rotate. Since the support column 101 is installed in the shaft mounting hole 52 by installing the bearing 103, the support column 101 will rotate in the shaft mounting hole 52, and each synchronous pulley 104 is engaged with the toothed belt 8, thereby driving multiple support columns 101 to rotate simultaneously through the toothed belt 8.

[0047] In this embodiment, a lifting support plate 6 is provided below the driving support rod 10. The lifting support plate 6 has a center plate 61 located in the middle position and edge plates 62 located on both sides. The center plate 61 and the edge plates 62 are respectively located below the bottom support plate 51. Through holes corresponding to the support columns 101 are also opened in the center plate 61 and the edge plates 62.

[0048] Specifically, each support column 101 is integrally provided with a threaded column 102 at its bottom, and each threaded column 102 is threadedly engaged with a threaded sleeve 63 at one end away from the support column 101. The threaded sleeves 63 are fixed to the center plate 61 and the edge plate 62 in a rectangular array, and the mounting bearings 103 correspond to the through holes on the center plate 61 and the edge plate 62.

[0049] By adopting the above technical solution, when the toothed belt 8 mobilizes multiple support columns 101 to rotate simultaneously, the threaded column 102 at the bottom of the support column 101 cooperates with the threaded sleeve 63, and the threaded cooperation at the connection pushes the center plate 61 and the edge plate 62 to rise and fall simultaneously. When descending, the lifting support plate 6 and the driving support rod 10 cooperate to lift the bracket 5 until the universal wheel 7 is separated from the ground, and the multiple driving support rods 10 will evenly distribute the load on the bracket 5, thereby increasing the load-bearing performance of the switch cabinet bracket, and can also prevent the connection between the universal wheel 7 and the bracket 5 from being damaged.

[0050] An adjustment dial 9 is movably connected to the mounting groove 56. The adjustment dial 9 has an integrally arranged anti-skid disc 91 and a drive pulley 92. The drive pulley 92 is located above the anti-skid disc 91 and is engaged with the toothed belt 8. The anti-skid disc 91 is located below the toothed belt 8, and one side of the anti-skid disc 91 extends to the side of the bottom support plate 51.

[0051] By adopting the above technical solution, since the anti-slip turntable 91 and the driving pulley 92 are arranged in one piece, the worker only needs to rotate the anti-slip turntable 91, and through the mutual engagement of the driving pulley 92 and the toothed belt 8, the toothed belt 8 is driven to move on the inner side of the belt groove 53, and then all the support columns 101 are driven to rotate synchronously. No separate adjustment is required, which saves a lot of time. In addition, when the support column 101 is rotated, there is no need to remove the switch cabinet from above the bottom support plate 51, so it is more convenient for workers to move the switch cabinet.

[0052] In this embodiment, the upper portion of the driving pulley 92 is movably connected to the cover plate 4 via a bearing, the toothed belt 8 is located below the cover plate 4, and the top of the steering wheel 55 is movably connected to the cover plate 4 via a pin shaft.

[0053] In this embodiment, the universal wheel 7 is located between the center plate 61 and the edge plate 62 , and the universal wheel 7 can rotate between the center plate 61 and the edge plate 62 .

[0054] In this embodiment, the switch cabinet has an incoming cabinet 1, a control cabinet 2 and an outgoing cabinet 3, and the incoming cabinet 1, the control cabinet 2 and the outgoing cabinet 3 are fixedly connected in sequence from left to right, and the bottoms of the incoming cabinet 1, the control cabinet 2 and the outgoing cabinet 3 are respectively fixedly connected to the cover plate 4.

[0055] The working principle of the present invention is as follows: when in use, the switch cabinet is first fixed to the cover plate 4, thereby installing the switch cabinet above the bracket 5, and then the position of the bracket 5 is adjusted by the universal wheel 7, and then the position of the switch cabinet is adjusted. After moving to the appropriate position, the staff rotates the anti-skid turntable 91. Since the anti-skid turntable 91 and the driving pulley 92 are integrally arranged, the anti-skid turntable 91 will drive the driving pulley 92 to rotate, and the driving pulley 92 and the toothed belt 8 are meshed with each other, so that the movable toothed belt 8 moves on the inner side of the placement belt groove 53, and when the toothed belt 8 moves, the toothed belt 8 and the synchronous pulley 104 are meshed with each other, so that the synchronous pulley 104 drives the support column 101 to rotate. The bearing 103 is installed in the shaft mounting hole 52, so the support column 101 will rotate in the shaft mounting hole 52, and each of the synchronous pulleys 104 is engaged with the toothed belt 8, thereby driving multiple support columns 101 to rotate simultaneously through the toothed belt 8. At this time, through the threaded cooperation between the threaded column 102 at the bottom of the support column 101 and the threaded sleeve 63, the center plate 61 and the edge plate 62 are synchronously lowered until the lifting support plate 6 and the driving support rod 10 cooperate to lift the bracket 5. At this time, the universal wheel 7 is separated from the ground, and the multiple driving support rods 10 will evenly distribute the load on the bracket 5, thereby increasing the load-bearing performance of the switch cabinet bracket, and can also prevent the connection between the universal wheel 7 and the bracket 5 from being damaged;

[0056] After completing the above adjustment, the operator presses down the anti-skid turntable 91 so that the positioning slot 912 engages with the positioning tooth 57 at the position of the mounting groove 56. After reaching the bottom, the operator rotates the fastening base 910. At this time, the second thread 911 on the inner wall of the fastening base 910 engages with the first thread 58 at the position of the mounting groove 56 to fix it. At the same time, the driving pulley 92 on the top of the anti-skid turntable 91 moves downward synchronously, driving the limit block 93 on its top to engage with the toothed belt 8, preventing the support column 101 from falling due to the overall weight, thereby maintaining the current state.

[0057] On the other hand, when releasing this state, it is only necessary to rotate the fastening base 910 in the reverse direction. At this time, the second thread 911 is separated from the first thread 58. Under the action of the spring 914, the anti-slip turntable 91 will move upward according to its elastic properties. Finally, the toothed belt 8 and the drive pulley 92 are engaged, and the adjustment process is carried out again.

[0058] The embodiments disclosed in the present invention are preferred embodiments, but are not limited to them. Ordinary technicians in this field can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. As long as they do not deviate from the spirit of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A mobile switch cabinet bracket device, characterized in that: The invention comprises a switch cabinet, wherein the bottom of the switch cabinet is fixedly connected to a bracket (5) via a cover plate (4), and the cover plate (4) is fixedly connected to the switch cabinet, the bottom of the bracket (5) is provided with a universal wheel (7) in a rectangular array, the bracket (5) comprises a bottom support plate (51) fixedly connected to the cover plate (4), and a shaft rod mounting hole (52) for a driving support rod (10) and a placement belt groove (53) for placing a toothed belt (8) are provided on a side of the bracket (5) close to the cover plate (4), wherein the shaft rod mounting holes (52) are distributed in a rectangular array, and each of the shaft rod mounting holes (52) is connected to the placement belt groove (53); A steering cavity (54) is further provided on the inner side of the bottom support plate (51), and the steering cavity (54) is communicated with both ends of the placement groove (53), wherein a steering wheel (55) is symmetrically installed in the steering cavity (54), and the steering wheel (55) is movably connected to the bottom support plate (51) via a pin shaft; A toothed belt (8) is placed in the belt placement groove (53), and the toothed belt (8) passes around the outer side of the steering wheel (55) when passing through the steering cavity (54). A mounting groove (56) is also provided on the side of the bottom support plate (51), and the mounting groove (56) is communicated with the side of the belt placement groove (53), and the mounting groove (56) is located below the belt placement groove (53); A positioning tooth (57) is provided on the upper end of the side surface of the installation groove (56), and a first thread (58) is provided below the positioning tooth (57); A driving support rod (10) is installed in each of the shaft mounting holes (52), and the driving support rod (10) has a support column (101) movably connected to the shaft mounting hole (52), and an end of the support column (101) close to the shaft mounting hole (52) is interference-fitted with a mounting bearing (103), and an outer ring of the mounting bearing (103) is interference-fitted with the shaft mounting hole (52); The end of the support column (101) passes through the shaft mounting hole (52) and extends into the placement belt groove (53), and the end of the support column (101) is fixedly connected to a synchronous pulley (104), and each of the synchronous pulleys (104) is engaged with a toothed belt (8) placed in the placement belt groove (53); A lifting support plate (6) is provided below the driving support rod (10), and the lifting support plate (6) has a center plate (61) located in the middle and edge plates (62) located on both sides, and the center plate (61) and the edge plates (62) are respectively located below the bottom support plate (51), and through holes corresponding to the support columns (101) are also provided in the center plate (61) and the edge plates (62).

2. The mobile switch cabinet bracket device according to claim 1, characterized in that: The bottom of each support column (101) is integrally provided with a threaded column (102), and one end of each threaded column (102) away from the support column (101) is threadedly fitted with a threaded sleeve (63), the threaded sleeves (63) are respectively fixed on the center plate (61) and the edge plate (62) in a rectangular array, and the mounting bearings (103) correspond to the through holes on the center plate (61) and the edge plate (62).

3. The mobile switch cabinet bracket device according to claim 2, characterized in that: An adjusting turntable (9) is movably connected in the mounting groove (56), and the adjusting turntable (9) has an anti-skid turntable (91) and a driving pulley (92) arranged in an integrated manner, wherein the driving pulley (92) is located above the anti-skid turntable (91), and the driving pulley (92) and the toothed belt (8) are meshed with each other, and a molded limiting block (93) is provided above the driving pulley (92), and the limiting block (93) is engaged with the toothed belt (8) during the downward movement, and the anti-skid turntable (91) is located below the toothed belt (8), and one side of the anti-skid turntable (91) extends to the side of the bottom support plate (51); A fastening base (910) is slidably mounted on the bottom of the anti-skid turntable (91), and a second thread (911) matching a thread (58) is provided on the inner wall of the fastening base (910), and a positioning slot (912) matching a positioning tooth (57) is provided on the inner wall of the anti-skid turntable (91) above the second thread (911). Sliding beads (913) are mounted at symmetrical positions where the fastening base (910) and the anti-skid turntable (91) meet, and a spring (914) is fixedly mounted at the center position of the inner top of the anti-skid turntable (91).

4. The mobile switch cabinet bracket device according to claim 3, characterized in that: The upper portion of the driving pulley (92) is movably connected to the cover plate (4) via a bearing, the toothed belt (8) is located below the cover plate (4), and the top portion of the steering wheel (55) is movably connected to the cover plate (4) via a pin shaft.

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