Distributed photovoltaic access protection equipment

Abstract

The invention relates to the technical field of distributed photovoltaic access protection equipment, and particularly discloses distributed photovoltaic access protection equipment which comprises a wind meter installed at the top of an access box, two triangular windproof plate devices, a driving folding device, a power supply device and a power supply device. The driving folding device is installed at the bottom of the access box, the driving folding device drives the triangular windproof plate devices on the two sides of the access box to rotate, and the two telescopic devices are installed on the two sides of the triangular windproof plate devices correspondingly. The arranged triangular windproof plate equipment can be driven by the driving folding device and the telescopic device to rotate front and back, so that a certain angle can be formed between the triangular windproof plate equipment and the periphery of the access box, the wind speed is dispersed, and the situation that strong wind power directly hits the surface of the access box, consequently, the access box is unstable, and use of the distributed photovoltaic device is damaged and affected is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of distributed photovoltaic access protection equipment, and in particular to a distributed photovoltaic access protection equipment. Background Art

[0002] Distributed photovoltaic power generation refers specifically to photovoltaic power generation facilities that are built near user sites, operate in a way that users generate electricity for their own use, and connect excess electricity to the grid, and are characterized by balanced regulation of the distribution system. During the construction of distributed photovoltaic systems, access boxes are often used to connect and converge each photovoltaic unit. In the access box, multiple electrical devices are installed, such as circuit breakers, splitters, transformers, photovoltaic inverters and other components. In distributed photovoltaic systems, the access box needs to withstand high DC voltage and large current, and it is often placed in an outdoor environment without special personnel to supervise it.

[0003] Therefore, when some access boxes installed on the roof are in use, when encountering windy and rainy weather, the surface of the access box is directly hit by the wind, which can easily cause damage to the access box. To this end, we propose a distributed photovoltaic access protection device. Summary of the invention

[0004] The purpose of the present invention is to provide a distributed photovoltaic access protection device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a distributed photovoltaic access protection device, including an access box, and also including;

[0006] An anemometer, the anemometer being mounted on the top of the access box;

[0007] A triangular windbreak board device, wherein two triangular windbreak board devices are provided, and the two triangular windbreak board devices are respectively installed on both sides of the access box;

[0008] A driving folding device, which is installed at the bottom of the access box and drives the triangular windbreak plate devices on both sides of the access box to rotate;

[0009] The telescopic device is provided with two telescopic devices, and the two telescopic devices are respectively installed on both sides of the triangular windproof plate equipment.

[0010] Wherein, the triangular windbreak plate device comprises two triangular plates respectively arranged on both sides of the access box;

[0011] A first rotating rod is installed on the outer side of one end of the triangular plate, and a rotating plate is installed on the first rotating rod via a rotating shaft. A second rotating rod is installed on the other end of the rotating plate, and the second rotating rod is rotatably installed on the outer side of the access box via a rotating shaft.

[0012] Both the first rotating rod and the second rotating rod are connected to the driving folding device.

[0013] Wherein, the triangular plate comprises two telescopic plates, one ends of the two telescopic plates are rotatably connected through a rotating shaft, connecting plates are rotatably installed at the other ends of the two telescopic plates, and one end of the connecting plate is connected to the first rotating rod.

[0014] Wherein, the driving folding device comprises a first driving gear and a second driving gear respectively installed at the bottoms of the first rotating rod and the second rotating rod;

[0015] Steering devices are respectively installed between the two first driving gears and between the two second driving gears;

[0016] A driving connection device is installed between the mutually approaching first driving gear and second driving gear.

[0017] Wherein, the steering device comprises two steering gears respectively meshed and connected to the outer sides of the first driving gear and the second driving gear;

[0018] The steering gear is installed at the bottom of the access box, a fixed gear is installed on the outer side of the steering gear, and a first gear chain and a second gear chain are respectively meshed and connected between the two fixed gears and the other first driving gear and second driving gear.

[0019] Wherein, the driving connection device comprises an arc-shaped gear installed on the outer side of the second driving gear, a driving motor is installed at the center of the arc-shaped gear, and the driving motor is installed at the bottom of the access box through a motor bracket;

[0020] A first rotating gear and a second rotating gear are respectively installed on the outer side of the arc-shaped gear, and the second rotating gear is installed on the outer side of the second rotating rod;

[0021] The first rotating gear is rotatably installed at the bottom of the access box, a connecting component is installed on the outer side of the first rotating gear, and the connecting component drives the first rotating rod to rotate;

[0022] A positioning device is installed at the output end of the driving motor.

[0023] Wherein, the connecting component comprises a first connecting gear installed on the top of the first rotating gear, a third gear chain is meshed and connected to the outer side of the first connecting gear, the other end of the third gear chain is meshed and connected to a second connecting gear, and the center of the second connecting gear is installed on the outer side of the first rotating rod.

[0024] Wherein, the positioning device comprises an arc-shaped rotating block installed at the output end of the driving motor, and the arc-shaped block comprises a smooth part and an arc part;

[0025] An arc-shaped groove is provided on the outer side of the arc-shaped portion, and positioning portions are slidably connected to both ends of the arc-shaped groove respectively;

[0026] The two positioning portions are respectively installed on the tops of the second driving gear and the first connecting gear.

[0027] Among them, the positioning portion includes a lifting column that slides inside the arc-shaped groove. The top of the lifting column slides inside the arc-shaped groove. A positioning groove is provided at the bottom of the lifting column, and a positioning column slides inside the positioning groove. The positioning column is installed at the bottom of the access box;

[0028] A clamping groove is provided on the outer side of the positioning column, and a U-shaped clamping block is clamped inside the clamping groove. A positioning block is rotatably installed at the bottom of the U-shaped clamping block, and the positioning block is installed on the top of the second driving gear;

[0029] A connecting spring is installed on the outer side of the U-shaped positioning block, and the other end of the connecting spring is installed on the top of the second driving gear.

[0030] Among them, the telescopic device includes a telescopic cylinder installed on the connecting plate. A limiting block is rotatably installed at the output end of the telescopic cylinder, and both ends of the limiting block are respectively connected to the inner sides of the two telescopic plates;

[0031] A sliding groove is provided on the rotating plate, and one end of the telescopic cylinder slides inside the sliding groove.

[0032] The present invention has at least the following beneficial effects:

[0033] The provided triangular windproof plate device can rotate back and forth under the drive of the drive folding device and the telescopic device, and thus can form a certain angle with the periphery of the access box to disperse the wind speed, avoiding strong wind directly hitting the surface of the access box, resulting in instability of the access box and thus damage to the use of distributed photovoltaics. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a front view schematic diagram of the structure of the present invention;

[0035] Figure 2 is a top view schematic diagram of the structure of the present invention;

[0036] Figure 3 is a bottom view schematic diagram of the structure of the present invention;

[0037] Figure 4 is a front view schematic diagram of the triangular windproof device and the drive folding device of the structure of the present invention;

[0038] Figure 5 is a front view schematic diagram of the drive folding device of the structure of the present invention;

[0039] Figure 6Schematic front view of the structure positioning of the present invention;

[0040] Figure 7 Schematic top view of the drive device part of the structure of the present invention;

[0041] Figure 8 Schematic front view of the structure positioning device of the present invention;

[0042] Figure 9 Schematic front view of the cross-section of the arc-shaped rotating block of the structure of the present invention.

[0043] In the figure: 1, access box; 2, anemometer; 3, triangular wind protection plate device; 4, drive folding device; 5, telescopic device; 30, triangular plate; 31, first rotating rod; 32, rotating plate; 33, second rotating rod; 34, telescopic plate; 35, connecting plate; 40, first drive gear; 41, second drive gear; 42, drive connection device; 43, steering device; 430, steering gear; 431, fixed gear; 432, first gear chain; 433, second gear chain; 420, arc gear; 421, drive motor; 422, first rotating gear; 423, second rotating gear; 44, connection component; 45, positioning device; 440, first connection gear; 441, third gear chain; 442, second connection gear; 450, arc-shaped rotating block; 451, smooth part; 452, arc part; 453, arc groove; 46, positioning part; 460, lifting column; 461, positioning groove; 462, positioning column; 463, clamping groove; 464, U-shaped clamping block; 465, positioning block; 467, connection spring; 50, telescopic cylinder; 51, limiting block; 52, sliding groove. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0045] Please refer to Figures 1 to 9 , the present invention provides a technical solution: a distributed photovoltaic access protection device, including.

[0046] Including access box 1, and also including;

[0047] Anemometer 2, the anemometer 2 is fixedly installed on the top of the access box 1, and the anemometer 2 can detect the outdoor wind direction;

[0048] Triangular wind protection plate device 3, there are two triangular wind protection plate devices 3, and the two triangular wind protection plate devices 3 are respectively installed on both sides of the access box 1;

[0049] The driving folding device 4 is installed at the bottom of the access box 1, and the driving folding device 4 drives the triangular windproof plate devices 3 on both sides of the access box 1 to rotate;

[0050] The telescopic device 5 is provided with two, and the two telescopic devices 5 are respectively installed on both sides of the triangular windproof plate device 3;

[0051] When working, the anemometer 2 at the bottom of the access box 1 can detect the wind speed and direction. When the wind speed is relatively high, the anemometer 2 controls the driving mechanism folding device or the telescopic device 5 to open. When the wind direction is on the left and right sides of the access box 1, the two telescopic devices 5 open, and the telescopic device 5 drives the triangular windproof plate device 3 to open. Thus, the triangular windproof plate device 3 presents a triangular shape on both sides of the access box 1, which can guide and weaken the wind force and reduce the impact of the wind force on the access box 1;

[0052] When the wind direction enters from the front and rear sides of the access box 1, the anemometer 2 controls the driving folding device 4 to open. Therefore, the triangular windproof plate device 3 rotates and is placed at an angle with the outside of the access box 1 on the front side or the rear side of the access box 1, guiding the wind force on the front side or the rear side of the access box 1 and strengthening the impact of the wind speed on the outside of the access box 1;

[0053] The anemometer 2 is of the existing technology and is electrically controlled and connected to the triangular windproof plate device 3 and the driving folding device 4.

[0054] The triangular windproof plate device 3 includes triangular plates 30 respectively arranged on both sides of the access box 1;

[0055] A first rotating rod 31 is fixedly installed on the outside of one end of the triangular plate 30. The first rotating rod 31 is rotatably installed with a rotating plate 32 through a rotating shaft. A second rotating rod 33 is fixedly installed at the other end of the rotating plate 32, and the second rotating rod 33 is rotatably installed on the outside of the access box 1 through a rotating shaft;

[0056] Both the first rotating rod 31 and the second rotating rod 33 are connected to the driving folding device 4;

[0057] The triangular plate 30 includes two telescopic plates 34. One ends of the two telescopic plates 34 are rotatably connected through a rotating shaft. The other ends of the two telescopic plates 34 are both rotatably installed with connecting plates 35 through a rotating shaft, and one end of the connecting plate 35 is fixedly connected to the first rotating rod 31;

[0058] The driving folding device 4 includes a first driving gear 40 and a second driving gear 41 respectively installed at the bottoms of the first rotating rod 31 and the second rotating rod 33;

[0059] Steering devices 43 are respectively installed between the two first driving gears 40 and between the two second driving gears 41;

[0060] A driving connection device 42 is installed between the first driving gear 40 and the second driving gear 41 that are close to each other;

[0061] The steering device 43 includes two steering gears 430 that are respectively meshed and connected to the outer sides of the first driving gear 40 and the second driving gear 41;

[0062] The steering gears 430 are rotatably installed at the bottom of the access box 1, and a fixed gear 431 is fixedly installed on the outer side of the steering gears 430. A first gear chain 432 and a second gear chain 433 are respectively meshed and connected between the two fixed gears 431 and another first driving gear 40 and second driving gear 41;

[0063] The driving connection device 42 includes an arc-shaped gear 420 installed on the outer side of the second driving gear 41. A driving motor 421 is fixedly installed at the center of the arc-shaped gear 420, and the driving motor 421 is fixedly installed at the bottom of the access box 1 through a motor bracket;

[0064] A first rotating gear 422 and a second rotating gear 423 are respectively installed on the outer side of the arc-shaped gear 420, and the second rotating gear 423 is installed on the outer side of the second rotating rod 33;

[0065] The first rotating gear 422 is rotatably installed at the bottom of the access box 1, and a connecting component 44 is installed on the outer side of the first rotating gear 422. The connecting component 44 drives the first rotating rod 31 to rotate;

[0066] A positioning device 45 is installed at the output end of the driving motor 421;

[0067] The connecting component 44 includes a first connecting gear 440 fixedly installed on the top of the first rotating gear 422. A third gear chain 441 is meshed and connected to the outer side of the first connecting gear 440. The other end of the third gear chain 441 is meshed and connected to a second connecting gear 442, and the center of the second connecting gear 442 is fixedly installed on the outer side of the first rotating rod 31;

[0068] The positioning device 45 includes an arc-shaped rotating block 450 fixedly installed at the output end of the driving motor 421. The arc-shaped block includes a smooth part 451 and an arc part 452;

[0069] An arc-shaped groove 453 is arranged on the outer side of the arc part 452, and positioning parts 46 are respectively slidably connected to both ends of the arc-shaped groove 453;

[0070] The two positioning parts 46 are respectively installed on the tops of the second driving gear 41 and the first connecting gear 440;

[0071] The positioning part 46 includes a lifting column 460 that slides inside the arc-shaped groove 453. The two lifting columns 460 are respectively connected to both ends of the arc-shaped groove 453, and the middle of the bottom of both ends of the arc-shaped groove 453 is higher. The top of the lifting column 460 slides inside the arc-shaped groove 453. A positioning groove 461 is provided at the bottom of the lifting column 460, and a positioning column 462 slides inside the positioning groove 461. The positioning column 462 is fixedly installed at the bottom of the access box 1;

[0072] A clamping groove 463 is provided on the outer side of the positioning column 462, and a U-shaped clamping block 464 is clamped inside the clamping groove 463. A positioning block 465 is rotatably installed at the bottom of the U-shaped clamping block 464, and the positioning block 465 is fixedly installed at the top of the first connecting gear 440 of the second driving gear 41;

[0073] A connecting spring 467 is fixedly installed on the outer side of the U-shaped positioning block 465, and the other end of the connecting spring 467 is fixedly installed at the top of the first connecting gear 440 of the second driving gear 41;

[0074] When the wind blows from the front and back of the access box 1, the driving motor 421 is turned on. The driving motor 421 drives the arc-shaped gear 420 to rotate. The gear blocks on the arc-shaped gear 420 are arranged between the first rotating gear 422 and the second rotating gear 423, and can drive the first rotating gear 422 and the second rotating gear 423 to rotate respectively;

[0075] When the wind enters from the front side of the access box 1, the front side of the access box 1 mainly bears the wind force. The driving motor 421 is turned on to drive the arc-shaped gear 420 to rotate. The arc-shaped gear 420 rotates towards the second rotating rod 33 and the second rotating gear 423, and the driving motor 421 drives the arc-shaped rotating block 450 to rotate. The arc-shaped part 452 of the arc-shaped rotating block 450 rotates towards the second rotating gear 423, and the smooth part 451 on the other side of the arc-shaped rotating block 450 rotates towards the first rotating gear 422;

[0076] The arc-shaped groove 453 on the arc-shaped part 452 first drives the positioning column 462 to move in the vertical direction. The upward movement of the positioning column 462 causes the clamping groove 463 not to be clamped with the U-shaped clamping block 464. In this way, the arc-shaped gear 420 can drive the second rotating gear 423 to rotate, drive the second rotating rod 33 to rotate, the second rotating rod 33 drives the second driving gear 41 to rotate, the second driving gear 41 drives the second gear chain 433 to rotate, the second gear chain 433 drives the fixed gear 431 to rotate, the fixed gear 431 drives the steering gear 430 to rotate, and the steering gear 430 drives the remaining second driving gears 41 to rotate. Therefore, the two second rotating rods 33 rotate, driving the rotating plate 32 to rotate, and the rotating plate 32 drives the triangular plate 30 to rotate. The two triangular plates 30 form a triangular area on both sides of the access box 1 to guide the wind direction, reducing the impact of the wind force on the front side of the access box 1;

[0077] When the wind enters from the rear side of the access box 1, the rear side of the access box 1 mainly bears the wind force. The driving motor 421 drives the arc-shaped gear 420 to rotate. The arc-shaped gear 420 rotates towards the first rotating gear 422. And the driving motor 421 drives the arc-shaped rotating block 450 to rotate. The arc-shaped part 452 of the arc-shaped rotating block 450 rotates towards the first rotating gear 422. And the smooth part 451 on the other side of the arc-shaped rotating block 450 rotates towards the first rotating gear 422;

[0078] Contact the fixation of the U-shaped clamping block 464. The arc-shaped gear 420 drives the first rotating gear 422 to rotate, drives the first connecting gear 440 and the third gear chain 441 to rotate, drives the second connecting gear 442 to rotate. The second connecting gear 442 drives the first rotating rod 31 to rotate. The first rotating rod 31 drives the first driving gear 40 to rotate. The first driving gear 40 drives the first gear chain 432 and the fixed gear 431 to rotate, drives the other steering gear 430, the first driving gear 40 and the first rotating rod 31 to rotate. Therefore, the two connecting plates 35 can rotate to form a triangular area to avoid the impact of the wind on the rear side of the access box 1;

[0079] When the triangular plate 30 is not in use, the arc-shaped rotating block 450 rotates back to the initial position, and the positioning column 462 finally moves downwards to press and clamp the clamping on the lifting column 460 of the U-shaped clamping block 464. Therefore, the two U-shaped connectable blocks are positioned. So the second driving gear 41 and the first connecting gear 440 are positioned. Therefore, the first rotating rod 31 and the other rotating rod are fixed.

[0080] The telescopic device 5 includes a telescopic cylinder 50 fixedly installed on the connecting plate 35. The output end of the telescopic cylinder 50 is rotatably installed with a limiting block 51. Both ends of the limiting block 51 are fixedly connected to the inner sides of the two telescopic plates 34 respectively;

[0081] The rotating plate 32 is provided with a sliding groove 52. One end of the telescopic cylinder 50 slides inside the sliding groove 52;

[0082] When the wind enters from both sides of the access box 1, the telescopic cylinder 50 is opened. The telescopic cylinder 50 drives the telescopic plate 34 to move, and the telescopic rods form a triangular plate 30. Therefore, the wind can be guided to weaken the influence of the wind speed on both sides of the access box 1.

[0083] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0084] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A distributed photovoltaic access protection device, comprising an access box (1): characterized in that: Further included are; An anemometer (2), which is installed on the top of the access box (1); Triangular windproof plate devices (3), there are two of the triangular windproof plate devices (3), and the two triangular windproof plate devices (3) are respectively installed on both sides of the access box (1); A driving folding device (4), which is installed at the bottom of the access box (1), and the driving folding device (4) drives the triangular windproof plate devices (3) on both sides of the access box (1) to rotate; Expansion devices (5), there are two of the expansion devices (5), and the two expansion devices (5) are respectively installed on both sides of the triangular windproof plate device (3).

2. The distributed photovoltaic access protection device according to claim 1, wherein: The triangular windproof plate device (3) includes two triangular plates (30) respectively arranged on both sides of the access box (1); A first rotating rod (31) is installed on the outer side of one end of the triangular plate (30), a rotating plate (32) is installed on the first rotating rod (31) through a rotating shaft, a second rotating rod (33) is installed on the other end of the rotating plate (32), and the second rotating rod (33) is rotatably installed on the outer side of the access box (1) through a rotating shaft; Both the first rotating rod (31) and the second rotating rod (33) are connected to the driving folding device (4).

3. The distributed photovoltaic access protection device according to claim 2, characterized in that: The triangular plate (30) includes two telescopic plates (34), one ends of the two telescopic plates (34) are rotatably connected through a rotating shaft, connecting plates (35) are rotatably installed on the other ends of the two telescopic plates (34), and one end of the connecting plate (35) is connected to the first rotating rod (31).

4. The distributed photovoltaic access protection device according to claim 1, characterized in that: The driving folding device (4) includes a first driving gear (40) and a second driving gear (41) respectively installed at the bottoms of the first rotating rod (31) and the second rotating rod (33); Steering devices (43) are respectively installed between the two first driving gears (40) and between the two second driving gears (41); A driving connection device (42) is installed between the mutually approaching first driving gear (40) and second driving gear (41).

5. The distributed photovoltaic access protection device according to claim 4, characterized in that: The steering device (43) includes two steering gears (430) respectively meshed and connected to the outer sides of the first driving gear (40) and the second driving gear (41); The steering gear (430) is installed at the bottom of the access box (1), a fixed gear (431) is installed on the outer side of the steering gear (430), and a first gear chain (432) and a second gear chain (433) are respectively meshed and connected between the two fixed gears (431) and another first driving gear (40) and second driving gear (41).

6. The distributed photovoltaic access protection device according to claim 4, characterized in that: The driving connection device (42) includes an arc-shaped gear (420) installed on the outer side of the second driving gear (41), a driving motor (421) is installed at the center of the arc-shaped gear (420), and the driving motor (421) is installed at the bottom of the access box (1) through a motor bracket; A first rotating gear (422) and a second rotating gear (423) are respectively installed on the outer side of the arc-shaped gear (420), and the second rotating gear (423) is installed on the outer side of the second rotating rod (33); The first rotating gear (422) is rotatably installed at the bottom of the access box (1). A connection component (44) is installed outside the first rotating gear (422), and the connection component (44) drives the first rotating rod (31) to rotate; A positioning device (45) is installed at the output end of the drive motor (421).

7. The distributed photovoltaic access protection device according to claim 6, characterized in that: The connection component (44) includes a first connection gear (440) installed at the top of the first rotating gear (422). A third gear chain (441) is meshed and connected outside the first connection gear (440). The other end of the third gear chain (441) is meshed and connected with a second connection gear (442), and the center of the second connection gear (442) is installed outside the first rotating rod (31).

8. The distributed photovoltaic access protection device according to claim 6, characterized in that: The positioning device (45) includes an arc-shaped rotating block (450) installed at the output end of the drive motor (421). The arc-shaped block includes a smooth part (451) and an arc part (452); An arc-shaped groove (453) is arranged outside the arc part (452), and positioning parts (46) are respectively slidably connected to both ends of the arc-shaped groove (453); The two positioning parts (46) are respectively installed at the tops of the second drive gear (41) and the first connection gear (440).

9. The distributed photovoltaic access protection device according to claim 8, wherein: The positioning part (46) includes a lifting column (460) slidable inside the arc-shaped groove (453). The top of the lifting column (460) slides inside the arc-shaped groove (453). A positioning groove (461) is arranged at the bottom of the lifting column (460). A positioning column (462) slides inside the positioning groove (461), and the positioning column (462) is installed at the bottom of the access box (1); A clamping groove (463) is arranged outside the positioning column (462). A U-shaped clamping block (464) is clamped inside the clamping groove (463). A positioning block (465) is rotatably installed at the bottom of the U-shaped clamping block (464), and the positioning block (465) is installed at the top of the second drive gear (41); A connection spring (467) is installed outside the U-shaped positioning block (465), and the other end of the connection spring (467) is installed at the top of the second drive gear (41).

10. The distributed photovoltaic access protection device according to claim 1, characterized in that: The telescopic device (5) includes a telescopic cylinder (50) installed on the connecting plate (35). A limiting block (51) is rotatably installed at the output end of the telescopic cylinder (50), and both ends of the limiting block (51) are respectively connected to the inner sides of the two telescopic plates (34); A sliding groove (52) is arranged on the rotating plate (32), and one end of the telescopic cylinder (50) slides inside the sliding groove (52).

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