A composite plant anti-sand structure for desert photovoltaic power station engineering

Abstract

The present invention belongs to the technical field of windbreak and sand control, and is particularly a composite sand control structure for plants in a desert photovoltaic power station project, comprising a fixed plate, a culture pot is fixedly installed on the fixed plate in a through-type manner, a plant body is arranged in the culture pot, a plurality of knocking mechanisms are arranged on the fixed plate and are evenly spaced, the plurality of knocking mechanisms all penetrate the fixed plate and are movably connected to the fixed plate, a digging mechanism is arranged at the bottom end of the knocking mechanism, the knocking mechanism is used to drive the digging mechanism to dig in the sand, and in windy weather, the knocking mechanism is used to knock the digging mechanism to move downward in a spiral. The present invention can knock the digging mechanism through the knocking mechanism in windy weather, and by making the digging mechanism dig downward in a spiral, it can also prevent the knocking mechanism from being pulled upward, thereby improving the burial stability of the knocking mechanism and the digging mechanism in the sand.

Description

Technical Field

[0001] The invention relates to the technical field of windbreak and sand control, and in particular to a composite sand-control structure of desert photovoltaic power station engineering plants. Background Art

[0002] With the development of renewable energy, photovoltaic power generation has become one of the most promising renewable energy sources. However, the particularity of the desert environment, such as arid climate, sparse vegetation and frequent wind and sand activities, has brought great challenges to the construction and maintenance of photovoltaic power stations. Taking effective anti-sand measures to protect the safety and stability of power stations has become an important issue at present. At present, traditional anti-sand measures mainly include grass grid sand barriers and planting sand-fixing plants. These measures can play a role in preventing sand to a certain extent. When encountering strong winds, plants planted in the sand can easily be blown out of the sand by the strong wind. Therefore, a composite anti-sand structure of desert photovoltaic power station engineering plants is proposed. Summary of the invention

[0003] In order to solve the shortcomings of the prior art, the present invention proposes a composite anti-sand structure of desert photovoltaic power station engineering plants.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a composite sand-proof structure for plants in a desert photovoltaic power station project, comprising a fixed plate, a culture pot is fixedly installed on the fixed plate, a plant body is arranged in the culture pot, a plurality of knocking mechanisms distributed at equal intervals are arranged on the fixed plate, the plurality of knocking mechanisms all penetrate the fixed plate and are movably connected to the fixed plate, a digging mechanism is arranged at the bottom end of the knocking mechanism, the knocking mechanism is used to drive the digging mechanism to dig in the sand, and in windy weather, the knocking mechanism is used to knock the digging mechanism to move spirally downward.

[0005] Furthermore, the fixed plate can shield the sand below and reduce the evaporation of water in the sand. The culture pot is provided with a plurality of holes, and the roots of the plant body can pass through the holes on the culture pot and contact the surrounding sand, so that the plant body can become a whole with the surrounding sand.

[0006] Preferably, the fixed plate is provided with a plurality of mounting holes, the knocking mechanism comprises a cylinder one which passes through the mounting hole and is movably connected to the inner wall of the mounting hole, the excavation mechanism comprises a conical box arranged at the bottom end of the cylinder one, a cylinder four is fixedly mounted on the top of the conical box, the cylinder four is slidably sleeved on the cylinder one, an excavation blade is fixedly mounted on the outside of the conical box, a plurality of beveled holes distributed in a circular array are provided on the inner wall of the conical box, and a plurality of sand discharge holes distributed in a circular array are provided on the top inner wall of the conical box.

[0007] Preferably, the excavation mechanism also includes an annular plate 1 fixedly mounted on the inner wall of the cylinder 1, an annular plate 2 is provided above the annular plate 1, the annular plate 2 is slidably connected to the inner wall of the cylinder 1, a one-way bearing 2 is provided on the inner side of the annular plate 2, the one-way bearing 2 includes an outer ring and an inner ring, the outer ring of the one-way bearing 2 is fixedly connected to the inner wall of the annular plate 2, a cylinder is fixedly mounted on the inner ring of the one-way bearing 2, the cylinder passes through the annular plate 1 and the top of the conical box and is movably connected to the annular plate 1 and the top of the conical box, a same return spring 2 is fixedly mounted between the annular plate 1 and the annular plate 2, a retaining ring is provided above the annular plate 2, the retaining ring is fixedly connected to the inner wall of the cylinder 1, a cylinder 3 is movably sleeved on the cylinder, and the cylinder 3 is fixedly connected to the inner wall of the top of the conical box.

[0008] Preferably, a plurality of spiral ribs distributed in a circular array are fixedly mounted on the inner wall of the cylinder three, and a plurality of spiral grooves matching the plurality of spiral ribs are opened on the side surface of the cylinder.

[0009] Preferably, a nut is fixedly sleeved on the outer side of the cylinder, a one-way bearing is provided on the inner side of the cylinder, the one-way bearing comprises an outer ring and an inner ring, the outer ring of the one-way bearing is fixedly connected to the inner wall of the cylinder, a transmission shaft is fixedly installed on the inner ring of the one-way bearing, a driving impeller is fixedly installed on the top end of the transmission shaft, a round box is fixedly installed on the bottom end of the transmission shaft, and the bottom of the round box is opened.

[0010] Preferably, a half-end face toothed disc is fixedly installed at the bottom end of the round box, a bevel gear is meshedly connected to the half-end face toothed disc, a round shaft is fixedly installed on the bevel gear, both ends of the round shaft are rotatably connected to an inner wall of a cylinder, a spur gear is fixedly sleeved on the round shaft, a rack is meshedly connected to the spur gear, a counterweight column is fixedly installed at the bottom end of the rack, the counterweight column is slidably connected to an inner wall of the cylinder, and the bottom end of the counterweight column is conically arranged.

[0011] Preferably, two symmetrically distributed cylinders 2 are fixedly installed through the inner wall of the cylinder 1, a locking column is slidably installed in the cylinder 2, the bottom end of the locking column extends to the outside of the sand discharge hole and a baffle is fixedly installed, and the same return spring 1 is fixedly installed between the baffle and the cylinder 2, and the return spring 1 is slidably sleeved on the locking column.

[0012] Preferably, a rotating shaft is rotatably installed through the baffle, and two oblique levers are fixedly installed on the top of the counterweight column. The two oblique levers are respectively matched with the corresponding rotating shafts, and the two oblique levers are arranged in a V shape.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention can knock the excavation mechanism through the knocking mechanism in windy weather, and by making the excavation mechanism spiral downward, it can also prevent the knocking mechanism from being pulled upward, thereby improving the burial stability of the knocking mechanism and the excavation mechanism in the sand;

[0015] 2. By transmitting the vibration generated when the knocking mechanism knocks the excavation mechanism to the surrounding sand, the loose sand can be continuously gathered toward the excavation mechanism, ensuring that the sand around the excavation mechanism and the knocking mechanism will not be hollow, ensuring that there is always a large friction between the knocking mechanism and the excavation mechanism, and improving the burial stability of the knocking mechanism and the excavation mechanism in the sand;

[0016] 3. In the knocking mechanism, when the torque generated by the driving impeller cannot move the counterweight column upward, the knocking mechanism and the excavation mechanism are always kept in a stationary state. Therefore, when the wind force is small and the driving impeller cannot rotate, it will not cause any impact on the knocking mechanism and the excavation mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The overall structure of the composite plant anti-sand structure for a desert photovoltaic power station proposed by the present invention is shown in FIG. Figure 1 ;

[0018] Figure 2 The overall structure of the composite plant anti-sand structure for a desert photovoltaic power station proposed by the present invention is shown in FIG. Figure 2 ;

[0019] Figure 3 A side cross-sectional view of a knocking mechanism and a tunneling mechanism in a composite anti-sand structure of a desert photovoltaic power station project proposed by the present invention;

[0020] Figure 4 for Figure 3 A schematic diagram of the enlarged structure of part A;

[0021] Figure 5 for Figure 3 A schematic diagram of the enlarged structure of part B;

[0022] Figure 6 This is a schematic diagram of the structure of the cylindrical three-column structure in the composite sand-proof structure of the plant in a desert photovoltaic power station project proposed by the present invention.

[0023] In the figure: 1, fixing plate; 11, mounting hole; 2, culture pot; 3, plant body; 4, knocking mechanism; 41, cylinder 1; 42, one-way bearing 1; 43, transmission shaft; 44, driving impeller; 45, round box; 46, half end face gear plate; 47, round shaft; 48, bevel gear; 49, spur gear; 410, rack; 411, counterweight column; 412, cylinder 2; 413, locking column; 414, baffle plate; 41 5. Return spring one; 416. Rotating shaft; 417. Oblique lever; 418. Nut; 5. Excavation mechanism; 51. Conical box; 52. Excavation blade; 53. Cylinder three; 531. Spiral rib; 54. Cylinder; 541. Spiral groove; 55. Annular plate one; 56. Annular plate two; 57. One-way bearing two; 58. Retaining ring; 59. Return spring two; 510. Cylinder four; 511. Oblique hole; 512. Sand discharge hole. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Please refer to Figure 1-Figure 6 The present invention provides a technical solution: a composite anti-sand structure for plants in a desert photovoltaic power station project, comprising a fixed plate 1, a culture pot 2 is fixedly installed on the fixed plate 1, a plant body 3 is arranged in the culture pot 2, a plurality of knocking mechanisms 4 distributed at equal intervals are arranged on the fixed plate 1, the plurality of knocking mechanisms 4 all penetrate the fixed plate 1 and are movably connected to the fixed plate 1, a digging mechanism 5 is arranged at the bottom end of the knocking mechanism 4, the knocking mechanism 4 is used to drive the digging mechanism 5 to dig in the sand, and in windy weather, the knocking mechanism 4 is used to knock the digging mechanism 5 to move spirally downward.

[0026] A plurality of mounting holes 11 are provided on the fixing plate 1, the knocking mechanism 4 comprises a cylinder 41 penetrating the mounting hole 11 and movably connected to the inner wall of the mounting hole 11, the excavation mechanism 5 comprises a conical box 51 arranged at the bottom end of the cylinder 41, a cylinder 4 510 is fixedly installed on the top of the conical box 51, the cylinder 4 510 is slidably sleeved on the cylinder 41, an excavation blade 52 is fixedly installed on the outer side of the conical box 51, a plurality of oblique holes 511 distributed in a circular array are provided on the inner wall of the conical box 51, and a plurality of sand discharge holes 512 distributed in a circular array are provided on the inner wall of the top of the conical box 51.

[0027] Furthermore, through the cooperation of multiple bevel holes 511, when the conical box 51 is excavating in the sand, the sand will enter the interior of the conical box 51 through the bevel holes 511, and the excess sand will be discharged from the multiple sand discharge holes 512. The sand inside the conical box 51 is used for counterweighting, and the sand above the conical box 51 is blocked, so that the stability of the conical box 51 buried in the sand can be improved.

[0028] The excavation mechanism 5 also includes an annular plate 1 55 fixedly mounted on the inner wall of the cylinder 1 41, an annular plate 2 56 is provided above the annular plate 1 55, the annular plate 2 56 is slidably connected to the inner wall of the cylinder 1 41, a one-way bearing 2 57 is provided on the inner side of the annular plate 2 56, the one-way bearing 2 57 includes an outer ring and an inner ring, the outer ring of the one-way bearing 2 57 is fixedly connected to the inner wall of the annular plate 2 56, a cylinder 54 is fixedly mounted on the inner ring of the one-way bearing 2 57, the cylinder 54 passes through the annular plate 1 55 and the top of the conical box 51 and is movably connected to the annular plate 1 55 and the top of the conical box 51, a same return spring 2 59 is fixedly mounted between the annular plate 1 55 and the annular plate 2 56, a retaining ring 58 is provided above the annular plate 2 56, the retaining ring 58 is fixedly connected to the inner wall of the cylinder 1 41, a cylinder 3 53 is movably sleeved on the cylinder 54, and the cylinder 3 53 is fixedly connected to the inner wall of the top of the conical box 51.

[0029] Furthermore, a plurality of limiting ribs are fixed to the outer side of the annular plate 2 56 , and limiting grooves matching the plurality of limiting ribs are opened on the inner wall of the cylinder 1 41 . Through the cooperation of the plurality of limiting ribs and limiting grooves, it is ensured that the annular plate 2 56 can only move vertically up and down in the cylinder 1 41 .

[0030] A plurality of spiral ribs 531 distributed in a circular array are fixedly mounted on the inner wall of the cylinder 53 , and a plurality of spiral grooves 541 matching the plurality of spiral ribs 531 are opened on the side of the cylinder 54 .

[0031] Furthermore, by providing a one-way bearing 2 57, when the cylinder 54 moves downward, the cylinder 54 and the annular plate 2 56 will become a whole. Therefore, with the cooperation of multiple sets of spiral grooves 541 and spiral ribs 531, the downward-moving cylinder 54 will drive the cylinder 3 53 to rotate, and when the cylinder 54 moves upward, the cylinder 54 will rotate on its own and will not drive other components to move.

[0032] A nut 418 is fixedly sleeved on the outer side of the cylinder 41, and a one-way bearing 42 is provided on the inner side of the cylinder 41. The one-way bearing 42 includes an outer ring and an inner ring. The outer ring of the one-way bearing 42 is fixedly connected to the inner wall of the cylinder 41, and a transmission shaft 43 is fixedly installed on the inner ring of the one-way bearing 42. A driving impeller 44 is fixedly installed on the top end of the transmission shaft 43, and a round box 45 is fixedly installed on the bottom end of the transmission shaft 43. The bottom of the round box 45 is opened.

[0033] A half-end face gear disc 46 is fixedly installed at the bottom end of the round box 45, and a bevel gear 48 is meshedly connected to the half-end face gear disc 46. A round shaft 47 is fixedly installed on the bevel gear 48. Both ends of the round shaft 47 are rotatably connected to the inner wall of the cylinder 41. A spur gear 49 is fixedly sleeved on the round shaft 47, and a rack 410 is meshedly connected to the spur gear 49. A counterweight column 411 is fixedly installed at the bottom end of the rack 410. The counterweight column 411 is slidably connected to the inner wall of the cylinder 41, and the bottom end of the counterweight column 411 is conically set.

[0034] Two symmetrically distributed cylinders 412 are fixedly installed through the inner wall of the cylinder 1 41, a locking column 413 is slidably installed in the cylinder 2 412, the bottom end of the locking column 413 extends to the outside of the sand discharge hole 512 and a baffle 414 is fixedly installed, and the same return spring 1 415 is fixedly installed between the baffle 414 and the cylinder 2 412, and the return spring 1 415 is slidably sleeved on the locking column 413.

[0035] A rotating shaft 416 is rotatably installed through the baffle 414 , and two oblique levers 417 are fixedly installed on the top of the counterweight column 411 . The two oblique levers 417 are respectively matched with the corresponding rotating shaft 416 , and the two oblique levers 417 are arranged in a V shape.

[0036] Furthermore, by providing a one-way bearing 42, the driving impeller 44 can only drive the transmission shaft 43 to rotate in a single direction, and ultimately the spur gear 49 can only drive the rack 410 to move upward, and the rotating spur gear 49 will not push the rack 410 to move downward.

[0037] Furthermore, when the wind force is relatively small, the torque generated by the driving impeller 44 cannot move the counterweight column 411 upward, so the driving impeller 44 cannot rotate when the wind force is relatively small, thereby ensuring that the knocking mechanism 4 and the excavation mechanism 5 are always in a stationary state.

[0038] In this embodiment: when in use, the nut 418 is screwed by a tool, and the nut 418 rotates and drives the cylinder 1 41 to rotate. At this time, the bottom end of the cylinder 1 41 is against the top of the conical box 51. When the nut 418 drives the cylinder 1 41 to rotate, it will drive the conical box 51 to rotate. The rotation of the conical box 51 will be screwed into the sand through the excavation blade 52. When the bottom of the nut 418 fits with the top of the fixing plate 1, the nut 418 will drive the fixing plate 1 to move down and fit tightly against the surface of the sand. At this time, the culture pot 2 is also buried in the pre-excavated pit.

[0039] In windy weather, the strong wind will sweep over the driving impeller 44 to make it rotate, and the driving impeller 44 will then drive the round box 45 to rotate through the transmission shaft 43, and the round box 45 will then drive the half-end face gear plate 46 to rotate. After the half-end face gear plate 46 is meshed with the bevel gear 48, as the half-end face gear plate 46 continues to rotate, it will drive the bevel gear 48 to rotate. The bevel gear 48 will then drive the spur gear 49 to rotate through the circular shaft 47. The rotation of the spur gear 49 will drive the rack 410 to move up, and the rack 410 will then drive the counterweight column 411 to move up. When the half-end face gear plate 46 is separated from the bevel gear 48, the counterweight column 411 will automatically fall down under the action of gravity.

[0040] The falling counterweight column 411 will knock the top of the cylinder 54, and the cylinder 54 will move vertically downward after being knocked. The downward movement of the cylinder 54 will generate a torsional force on the cylinder 3 53 through the cooperation of the multiple sets of spiral ribs 531 and the spiral grooves 541. The cylinder 3 53 will transmit the torsional force to the cone box 51, which will cause the cone box 51 to rotate. The rotating cone box 51 will move spirally downward in the sand through the cooperation of the excavation blades 52.

[0041] When the rack 410 drives the counterweight column 411 to move upward, the two sets of inclined levers 417 will push the two rotating shafts 416 to approach each other. When the two rotating shafts 416 approach each other, the two return springs 415 will be stretched and extended. After the counterweight column 411 falls, the two inclined levers 417 will be pushed downward under the return elastic force of the two stretched return springs 415. The two inclined levers 417 will push the counterweight column 411 downward. Therefore, the counterweight column 411 not only falls under the action of gravity, but the two return springs 415 can also accelerate the downward movement of the counterweight column 411, thereby increasing the falling speed of the counterweight column 411.

[0042] And after the two inclined levers 417 are separated from the corresponding rotating shafts 416, the top ends of the two locking columns 413 that are far away from each other will be extended out from the corresponding cylinder 2 412 under the action of inertia. By extending the two locking columns 413 of the two cylinders 412, the position of the cylinder 1 41 can be limited to ensure that the cylinder 1 41 will not be pushed to move upward during the spiral downward movement of the cone box 51. Therefore, the process of the top ends of the two locking columns 413 extending out from the corresponding cylinder 2 412 is carried out simultaneously with the process of the cone box 51 digging downward. After the cone box 51 digs downward for a certain distance, the two locking columns 413 will be reset and completely stored in the corresponding cylinder 2 412.

[0043] When the counterweight column 411 moves upward, the compressed return spring 2 59 will drive the annular plate 2 56 to move upward and return to its original position. When the annular plate 2 56 pulls the cylinder 54 upward, the cylinder 54 will rotate.

[0044] The impact force caused by the falling counterweight column 411 on the excavation mechanism 5 will be transmitted to the sand around the excavation mechanism 5. Through vibration, the surrounding loose sand is always kept close to the conical box 51 and the excavation blades 52, providing sufficient friction to the conical box 51 and the excavation blades 52, thereby improving the stability of the excavation mechanism 5 buried in the sand.

[0045] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A composite plant anti-sand structure for a desert photovoltaic power station project, comprising a fixing plate (1), characterized in that: A culture pot (2) is fixedly installed through the fixing plate (1), a plant body (3) is arranged in the culture pot (2), a plurality of knocking mechanisms (4) are arranged on the fixing plate (1) at equal intervals, the plurality of knocking mechanisms (4) all pass through the fixing plate (1) and are movably connected to the fixing plate (1), a digging mechanism (5) is arranged at the bottom end of the knocking mechanism (4), the knocking mechanism (4) is used to drive the digging mechanism (5) to dig in the sand, and in windy weather, the knocking mechanism (4) is used to knock the digging mechanism (5) to move spirally downward; The fixing plate (1) is provided with a plurality of mounting holes (11), the knocking mechanism (4) comprises a cylinder (41) penetrating the mounting hole (11) and movably connected to the inner wall of the mounting hole (11), the excavation mechanism (5) comprises a conical box (51) arranged at the bottom end of the cylinder (41), a cylinder (510) is fixedly mounted on the top of the conical box (51), the cylinder (510) is slidably sleeved on the cylinder (41), an excavation blade (52) is fixedly mounted on the outer side of the conical box (51), a plurality of oblique holes (511) distributed in a circumferential array are provided on the inner wall of the conical box (51), and a plurality of sand discharge holes (512) distributed in a circumferential array are provided on the inner wall of the top of the conical box (51); The excavation mechanism (5) further comprises an annular plate (55) fixedly mounted on the inner wall of the cylinder (41), an annular plate (56) is arranged above the annular plate (55), the annular plate (56) is slidably connected to the inner wall of the cylinder (41), a one-way bearing (57) is arranged on the inner side of the annular plate (56), the one-way bearing (57) comprises an outer ring and an inner ring, the outer ring of the one-way bearing (57) is fixedly connected to the inner wall of the annular plate (56), and a cylinder (54) is fixedly mounted on the inner ring of the one-way bearing (57). The cylinder (54) passes through the annular plate 1 (55) and the top of the conical box (51) and is movably connected to the annular plate 1 (55) and the top of the conical box (51); a same return spring 2 (59) is fixedly installed between the annular plate 1 (55) and the annular plate 2 (56); a retaining ring (58) is provided above the annular plate 2 (56); the retaining ring (58) is fixedly connected to the inner wall of the cylinder 1 (41); a cylinder 3 (53) is movably sleeved on the cylinder (54); the cylinder 3 (53) is fixedly connected to the inner wall of the top of the conical box (51); A plurality of spiral ribs (531) distributed in a circumferential array are fixedly mounted on the inner wall of the cylinder three (53), and a plurality of spiral grooves (541) matching the plurality of spiral ribs (531) are opened on the side surface of the cylinder (54).

2. The composite anti-sand structure of desert photovoltaic power station engineering plants according to claim 1 is characterized by: A nut (418) is fixedly sleeved on the outer side of the cylinder (41), and a one-way bearing (42) is provided on the inner side of the cylinder (41). The one-way bearing (42) comprises an outer ring and an inner ring. The outer ring of the one-way bearing (42) is fixedly connected to the inner wall of the cylinder (41). A transmission shaft (43) is fixedly installed through the inner ring of the one-way bearing (42). A driving impeller (44) is fixedly installed at the top end of the transmission shaft (43). A round box (45) is fixedly installed at the bottom end of the transmission shaft (43), and the bottom of the round box (45) is opened.

3. The composite anti-sand structure of a desert photovoltaic power station engineering plant according to claim 2 is characterized by: A half-end face gear disc (46) is fixedly mounted on the bottom end of the round box (45), a bevel gear (48) is meshedly connected to the half-end face gear disc (46), a round shaft (47) is fixedly mounted on the bevel gear (48), both ends of the round shaft (47) are rotatably connected to the inner wall of the first cylinder (41), a spur gear (49) is fixedly sleeved on the round shaft (47), a rack (410) is meshedly connected to the spur gear (49), a counterweight column (411) is fixedly mounted on the bottom end of the rack (410), the counterweight column (411) is slidably connected to the inner wall of the first cylinder (41), and the bottom end of the counterweight column (411) is conically arranged.

4. The composite anti-sand structure of a desert photovoltaic power station engineering plant according to claim 3 is characterized by: Two symmetrically distributed cylinders (412) are fixedly installed through the inner wall of the cylinder (41), a locking column (413) is slidably installed in the cylinder (412), the bottom end of the locking column (413) extends to the outside of the sand discharge hole (512) and is fixedly installed with a baffle (414), and a same return spring (415) is fixedly installed between the baffle (414) and the cylinder (412), and the return spring (415) is slidably sleeved on the locking column (413).

5. The composite anti-sand structure of desert photovoltaic power station engineering plants according to claim 4 is characterized by: A rotating shaft (416) is rotatably installed through the baffle plate (414), and two oblique levers (417) are fixedly installed on the top of the counterweight column (411). The two oblique levers (417) are respectively matched with the corresponding rotating shafts (416), and the two oblique levers (417) are arranged in a V shape.

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