CN115864963B

CN115864963B - Solar power generation equipment

Info

Publication number: CN115864963B
Application number: CN202211511791.5A
Authority: CN
Inventors: 沈宝荣
Original assignee: Wuhan Zhenglu Energy Co ltd
Current assignee: Wuhan Zhenglu Energy Co ltd
Priority date: 2022-11-29
Filing date: 2022-11-29
Publication date: 2023-06-27
Anticipated expiration: 2042-11-29
Also published as: CN115864963A

Abstract

The invention discloses solar power generation equipment, and relates to the technical field of solar power generation. The solar panel heat collection device comprises a movable bottom plate, wherein a bearing box is fixedly arranged on the upper surface of the movable bottom plate, a first placing groove and a second placing groove are formed in two sides of the upper surface of the bearing box, an angle inclination mechanism is arranged in the first placing groove, and the solar panel is adjusted according to the irradiation angle of solar rays through the arranged angle inclination mechanism, so that the heat collection density of the solar panel is increased, the solar panel can be inclined in four directions by the mechanism, the adjustment range of the device is further increased, the working efficiency of the solar panel in sunlight is improved, the problem that the solar panel of the existing solar power generation device in the prior art is fixed mostly, the irradiation angle of the solar rays is changed to reduce the heat collection density, and the working efficiency of the solar panel is reduced is solved.

Description

Solar power generation equipment

Technical Field

The invention belongs to the technical field of solar power generation, and particularly relates to solar power generation equipment.

Background

Solar thermal power generation is a technical form of converting solar radiant energy into heat energy and then into electric energy through various modes by utilizing a solar concentrator. Solar energy generally refers to the radiant energy of sunlight. The main utilization forms of solar energy include three main modes of photo-thermal conversion, photoelectric conversion and photochemical conversion of solar energy; at present, the new energy industry has wide development prospect. Solar energy is one of new energy sources, and solar energy is received through solar equipment to be converted into electric energy.

The solar panel in the existing solar power generation equipment is generally fixed on the support through bolts, the fixed bolts can be rusted after long-time exposure, the operation of workers can be difficult when the solar panel needs to be replaced, the solar panel of the existing solar power generation device is mostly fixed, the change of the irradiation angle of solar rays can cause the reduction of the heat collection density, and then the working efficiency of the solar panel is reduced.

Disclosure of Invention

The invention aims to provide solar power generation equipment, which solves the problems of the existing solar power generation equipment during use through arrangement.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to solar power generation equipment, which comprises a movable bottom plate, wherein a bearing box is fixedly arranged on the upper surface of the movable bottom plate, a first placing groove and a second placing groove are formed in two sides of the upper surface of the bearing box, an angle tilting mechanism is arranged in the first placing groove, a stabilizing mechanism is arranged on the surface of the angle tilting mechanism, a damping mechanism is arranged on the inner bottom wall of the second placing groove, a solar storage battery is arranged on the upper surface of the damping mechanism, protection baffles are rotatably connected to two sides of the upper surface of the first placing groove, a cover plate is rotatably connected to the upper surface of the second placing groove, and an anti-collision soft cushion is arranged on the lower surface of the cover plate.

Further, angle tilting mechanism includes the cross backup pad of diapire in first standing groove through bolt fixed mounting, the first connecting seat of the center department both sides of cross backup pad, the inside rotation of first connecting seat is connected with ball joint, ball joint's surface rotation is connected with first rotation seat, the last fixed surface who rotates the seat installs flexible cylinder, the output fixedly connected with first flexible post of flexible cylinder, first flexible post is fixed through the bolt, the one end fixedly connected with second rotation seat of first flexible post, the second rotation seat is connected with the second connecting seat through ball joint rotation.

Further, four sides department of cross backup pad upper surface all fixed mounting has the expansion plate, the surface threaded connection of expansion plate has stop bolt, and threaded connection and the screw thread groove at top, four the upper surface of expansion plate is connected with same connecting frame jointly.

Further, the equal fixed mounting of connecting frame upper surface week side has place the piece, the quantity of placing the piece is four, the spacing groove has been seted up on the surface of placing the piece, the draw-in groove has been seted up to one side of spacing groove, spacing post has been placed to the inside of spacing groove, the equal fixed mounting in both sides of spacing post surface one side has L shape connecting rod, L shape connecting rod is placed in the inside of draw-in groove, four the one end fixed mounting of L shape connecting rod has the guard frame, the center department fixedly connected with second connecting seat of guard frame lower surface.

Further, one side fixed mounting of placing the piece has first cardboard, the upper surface fixed mounting of first cardboard has the second cardboard, the surface sliding connection of second cardboard has the slip post, the one end fixed mounting of slip post has the pushing handle, the grafting groove has been seted up to the surface of spacing post, grafting groove and slip post looks adaptation.

Further, clamping springs are fixedly installed on two sides of the inner side wall of the protection frame, a supporting plate is fixedly installed on one side surface of each clamping spring, a solar panel is placed in the middle of each supporting plate, the solar panel is electrically connected with a solar storage battery through a lead, and a closing plate is rotatably connected to one side of the protection frame.

Further, stabilizing mean is including the spacing spout of seting up in first standing groove inside wall both sides, the quantity of spacing spout is four, four the equal sliding connection in inside of spacing spout has the slider, the surface fixed mounting of slider has first spherical joint, first spherical joint rotates and is connected with the flexible post of third, the interior bottom wall fixed mounting of the flexible post outer column of third has buffer spring, buffer spring's one end overlap joint is in the interior bottom wall of the flexible post inner column of third, the other end rotation of the flexible post of third is connected in the spherical joint of second, the outer column of second spherical joint fixed mounting in the flexible post of first.

Further, damping mechanism includes the damping bumper shock absorber of fixed mounting in second standing groove inner bottom wall both sides, two damping bumper shock absorber's upper surface fixed mounting has the loading board, the upper surface of loading board is seted up flutedly, solar cell has been placed to the inside of recess, the equal fixed mounting in both sides of loading board lower surface has first connecting piece, first connecting piece rotates and is connected with the fourth telescopic column, the inside fixed mounting of fourth telescopic column has damping spring, the one end rotation of fourth telescopic column is connected with the second connecting piece, second connecting piece fixed mounting is in the inside wall of second standing groove.

Further, universal wheels are fixedly arranged on the lower surface of the movable bottom plate, a handle is fixedly arranged on one side surface of the bearing box, and radiating holes are formed in two sides of the inner side wall of the second placing groove.

The invention has the following beneficial effects:

1. through the angle tilting mechanism, the solar panel is adjusted according to the irradiation angle of the solar rays, so that the density of the heat collected by the solar panel is increased, the solar panel can tilt in four directions by the angle tilting mechanism, the adjustment range of the device is further increased, the working efficiency of the solar panel in sunlight is further improved, the problems that the solar panel of the existing solar power generation device is mostly fixed in the prior art, the density of the heat collected is reduced due to the change of the irradiation angle of the solar rays, and the working efficiency of the solar panel is further reduced are solved;

2. through the stabilizing mechanism, when the solar panel adjusts the sunlight receiving angle, the stability of the solar panel in movement can be improved, and the practicability of the device is improved;

3. through the damping mechanism, when the equipment moves, the hollow land on the ground can lead the equipment to jolt, and in the jolt process, the damping mechanism can effectively protect the safety of the solar storage battery, greatly increase the shock resistance of the solar storage battery, and further improve the service life of the solar storage battery;

4. through the bearing box, the protection frame, the angle tilting mechanism and the protection baffle that set up, replaced the fixed mode of using the bolt, when the staff need change solar panel, open closed version and can change solar panel, when weather is overcast and rainy day, the angle tilting mechanism can shrink solar panel to the inside of bearing the weight of the box, then closes the protection baffle of both sides, prevents the slope of rainwater to part and solar panel, and then has prolonged the life of device.

Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those skilled in the art from this disclosure that the drawings described below are merely exemplary and that other embodiments may be derived from the drawings provided without undue effort.

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic view of an angle tilting mechanism according to the present invention;

FIG. 3 is a schematic cross-sectional view of the present invention;

FIG. 4 is a schematic view of a second view angle structure of the angle tilting mechanism of the present invention;

FIG. 5 is a schematic view of a structure of a solar panel and a protection frame according to the present invention;

FIG. 6 is a schematic view of the structure of the carrying case of the present invention;

FIG. 7 is a schematic view of a part of the shock absorbing mechanism of the present invention;

fig. 8 is a schematic structural diagram of a second embodiment of the angle tilting mechanism of the present invention.

In the drawings, the list of components represented by the various numbers is as follows:

1. a movable bottom plate;

2. a carrying case;

3. a first placement groove;

4. a second placement groove;

5. an angle tilting mechanism; 501. a cross-shaped support plate; 502. a first connection base; 503. a spherical joint; 504. a first rotating seat; 505. a telescopic cylinder; 506. a first telescoping column; 507. a telescoping plate; 508. a connection frame; 509. placing a block; 510. a limit column; 511. an L-shaped connecting rod; 512. a sliding column; 513. a plug-in groove;

6. a stabilizing mechanism; 601. limiting sliding grooves; 602. a first spherical joint; 603. a third telescoping column;

7. a damping mechanism; 701. damping shock absorber; 702. a carrying plate; 703. a first connector; 704. a fourth telescoping column; 705. a damping spring; 706. a second connector;

8. a solar storage battery;

9. a protective baffle;

10. a cover plate;

11. a clamping spring;

12. a support plate;

13. a solar panel;

14. a universal wheel;

15. a heat radiation hole;

16. and (5) protecting the frame.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus consistent with some aspects of the disclosure as detailed in the accompanying claims.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

Referring to fig. 1 to 8, the present invention is a solar power generation device, which comprises a movable bottom plate 1, wherein a carrying case 2 is fixedly installed on the upper surface of the movable bottom plate 1, two sides of the upper surface of the carrying case 2 are provided with a first placing groove 3 and a second placing groove 4, an angle tilting mechanism 5 is arranged in the first placing groove 3, a stabilizing mechanism 6 is arranged on the surface of the angle tilting mechanism 5, a damping mechanism 7 is arranged on the inner bottom wall of the second placing groove 4, a solar battery 8 is arranged on the upper surface of the damping mechanism 7, two sides of the upper surface of the first placing groove 3 are rotatably connected with a protection baffle 9, the upper surface of the second placing groove 4 is rotatably connected with a cover plate 10, and an anti-collision cushion is arranged on the lower surface of the cover plate 10.

The staff can remove the equipment, will equip and remove to the strong place of sunshine, then rotate the protective shield 9 of both sides to both sides, then upwards pull the inside angle tilting mechanism 5 of first standing groove 3, then fix through the bolt, the staff observes the angle of shining of sun to solar panel 13, be in the optimal position with the inclination of solar panel 13 through telescopic cylinder 505, the heat that solar panel 13 absorbed turns into electricity and stores in solar cell 8 inside, then improved the work efficiency of solar panel 13 under sunshine.

When being overcast and rainy weather, can demonstrate, shrink angle tilting mechanism 5 to the inside of first standing groove 3, then rotate the protection baffle 9 of both sides to the middle part, make it closed, protection baffle 9 can prevent the rainwater to solar panel 13 and interior part's erosion, when the staff needs to remove to equip, when the road section comparatively jolts, the equipment has avoided not taking place jolts, damper 7 can carry out effectual shock attenuation protection to inside solar battery 8, and then improved solar battery 8's life.

Example 2

Referring to fig. 1, 2, 4 and 8, further, the angle tilting mechanism 5 includes a cross-shaped supporting plate 501 fixedly mounted on the inner bottom wall of the first placing groove 3 through bolts, first connecting seats 502 on two sides of the center of the cross-shaped supporting plate 501, spherical joints 503 rotatably connected to the inner parts of the first connecting seats 502, first rotating seats 504 rotatably connected to the surfaces of the spherical joints 503, telescopic cylinders 505 fixedly mounted on the upper surfaces of the first rotating seats 504, first telescopic columns 506 fixedly connected to the output ends of the telescopic cylinders 505, the first telescopic columns 506 fixed through bolts, second rotating seats fixedly connected to one ends of the first telescopic columns 506 and rotatably connected to the second connecting seats through the spherical joints 503, telescopic plates 507 fixedly mounted on four sides of the upper surfaces of the cross-shaped supporting plate 501, limiting bolts screwed to the surfaces of the telescopic plates 507, the upper surfaces of the four expansion plates 507 are connected with the same connecting frame 508 through threads, the circumference sides of the upper surfaces of the connecting frame 508 are fixedly provided with placing blocks 509, the number of the placing blocks 509 is four, the surfaces of the placing blocks 509 are provided with limiting grooves, one side of each limiting groove is provided with a clamping groove, a limiting column 510 is placed in each limiting groove, two sides of one side of each limiting column 510 are fixedly provided with L-shaped connecting rods 511, the L-shaped connecting rods 511 are placed in the clamping grooves, one ends of the four L-shaped connecting rods 511 are fixedly provided with a protection frame 16, the center of the lower surface of the protection frame 16 is fixedly connected with a second connecting seat, one side of each placing block 509 is fixedly provided with a first clamping plate, the upper surface of each first clamping plate is fixedly provided with a second clamping plate, the surface of each second clamping plate is slidably connected with a sliding column 512, one end of each sliding column 512 is fixedly provided with a pushing handle, the surface of the limit post 510 is provided with a plugging groove 513, and the plugging groove 513 is matched with the sliding post 512.

Staff upwards pulls to be equipped for the connecting frame 508 removes to the outside of first standing groove 3, then make the device be fixed state through bolt fastening expansion plate 507, then the staff observes the direction of directing the sun, then move the slip post 512 of directing direction one side to the middle part and promote, make slip post 512 insert spacing post 510 surperficial jack-in groove 513 in, make spacing post 510 can rotate but unable removal, then pull the outside with three other slip posts 512, then start expansion cylinder 505, expansion cylinder 505 moves through first expansion cylinder 506, first expansion cylinder 506 removes and makes the protection frame 16 slope through second connecting seat and second rotation seat, in the middle of the spacing groove of this moment, three limit post 510 break away from the placing block 509 surface in addition, realized adjusting solar panel 13 according to the irradiation angle of solar ray, thereby make solar panel 13 collect the density increase of heat, this mechanism can incline solar panel 13 to four directions angle, and then the accommodation range of device has been increased, then the work efficiency of solar panel 13 under the improvement is, solar panel's work efficiency is reduced in the solar panel's of the sun, and solar panel's the solar panel's that solar panel's the solar panel's of the present technology of the change is not radiating density is greatly reduced, and the solar panel's of the solar panel's that the solar panel's of the prior art has not had the solar panel's of the change.

Example 3

Referring to fig. 1, 5 and 6, further, clamping springs 11 are fixedly installed on two sides of an inner side wall of a protection frame 16, a supporting plate 12 is fixedly installed on one side surface of each clamping spring 11, a solar panel 13 is placed in the middle of each supporting plate 12, the solar panel 13 is electrically connected with a solar storage battery 8 through a wire, a closing plate is rotatably connected to one side of the protection frame 16, a universal wheel 14 is fixedly installed on the lower surface of the movable bottom plate 1, a handle is fixedly installed on one side surface of the bearing box 2, and heat dissipation holes 15 are formed in two sides of the inner side wall of the second placing groove 4.

When the solar panel 13 needs to be replaced, the closing plate on one side of the protection frame 16 is opened, then the old solar panel 13 is taken out, the new solar panel 13 is placed in the protection frame 16, meanwhile, the supporting plates 12 on the two sides are extruded to move towards the two sides, the clamping springs 11 on the two sides shrink, the solar panel 13 in the middle is clamped and protected, and damage to the solar panel 13 caused by left and right shaking is reduced.

Example 4

Referring to fig. 2, 3 and 4, further, the stabilizing mechanism 6 includes four limiting sliding grooves 601 formed on two sides of the inner side wall of the first placing groove 3, sliding blocks are slidably connected in the four limiting sliding grooves 601, a first spherical joint 602 is fixedly mounted on the surface of the sliding blocks, a third telescopic column 603 is rotatably connected to the first spherical joint 602, a buffer spring is fixedly mounted on an inner bottom wall of an outer column of the third telescopic column 603, one end of the buffer spring is lapped on an inner bottom wall of an inner column of the third telescopic column 603, the other end of the third telescopic column 603 is rotatably connected to a second spherical joint, and the second spherical joint is fixedly mounted on an outer column of the first telescopic column 506.

When the angle tilting mechanism 5 works, the first telescopic column 506 of the angle tilting mechanism tilts, the first telescopic column 506 can extrude the third telescopic column 603 at one tilting side when tilting, the third telescopic column 603 at one extruding side can shrink, the buffer spring inside the extrusion is extruded, and meanwhile, the other three third telescopic columns 603 are driven to expand outwards and drive the sliding block to slide in the limiting chute 601, so that the stability of the device is improved when tilting.

Example 5

Referring to fig. 3 and 7, further, the damping mechanism 7 includes damping dampers 701 fixedly mounted on two sides of the inner bottom wall of the second placement groove 4, a carrying plate 702 is fixedly mounted on the upper surfaces of the two damping dampers 701, a groove is formed on the upper surface of the carrying plate 702, a solar battery 8 is placed in the groove, first connecting pieces 703 are fixedly mounted on two sides of the lower surface of the carrying plate 702, a fourth telescopic column 704 is rotatably connected to the first connecting pieces 703, damping springs 705 are fixedly mounted in the fourth telescopic column 704, a second connecting piece 706 is rotatably connected to one end of the fourth telescopic column 704, and the second connecting pieces 706 are fixedly mounted on the inner side wall of the second placement groove 4.

When the staff needs to remove and equip, when the road section comparatively jolts, equip and avoid not taking place jolting, jolting the effect that the time damping bumper shock absorber 701 can greatly alleviate solar battery 8 and receive jolting, the fourth telescopic column 704 that is connected between the first connecting piece 703 of loading board 702 below and the second connecting piece 706 of recess one side contracts, and extrude inside damping spring 705, damper 7 can protect the security of solar battery 8 effectively, greatly increased the shock-resistant ability of solar battery 8, thereby improved solar battery 8's life.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims.

Claims

1. A solar power generation apparatus, characterized in that: the solar energy storage device comprises a movable bottom plate (1), wherein a bearing box (2) is fixedly arranged on the upper surface of the movable bottom plate (1), a first placing groove (3) and a second placing groove (4) are formed in two sides of the upper surface of the bearing box (2), an angle tilting mechanism (5) is arranged in the first placing groove (3), a stabilizing mechanism (6) is arranged on the surface of the angle tilting mechanism (5), a damping mechanism (7) is arranged on the inner bottom wall of the second placing groove (4), a solar energy storage battery (8) is arranged on the upper surface of the damping mechanism (7), protection baffles (9) are rotationally connected to two sides of the upper surface of the first placing groove (3), a cover plate (10) is rotationally connected to the upper surface of the second placing groove, and an anti-collision cushion is arranged on the lower surface of the cover plate (10);

the angle tilting mechanism (5) comprises a cross-shaped supporting plate (501) fixedly mounted on the inner bottom wall of the first placing groove (3) through bolts, first connecting seats (502) are arranged on two sides of the center of the cross-shaped supporting plate (501), spherical joints (503) are rotatably connected to the inner parts of the first connecting seats (502), first rotating seats (504) are rotatably connected to the surfaces of the spherical joints (503), telescopic cylinders (505) are fixedly mounted on the upper surfaces of the first rotating seats (504), first telescopic columns (506) are fixedly connected to the output ends of the telescopic cylinders (505), the first telescopic columns (506) are fixed through bolts, second rotating seats are fixedly connected to one ends of the first telescopic columns (506), and the second rotating seats are rotatably connected to the second connecting seats through the spherical joints;

four sides of the upper surface of the cross-shaped supporting plate (501) are fixedly provided with telescopic plates (507), the surfaces of the telescopic plates (507) are in threaded connection with limit bolts, the threaded connection is connected with a threaded groove at the top, and the upper surfaces of the four telescopic plates (507) are commonly connected with the same connecting frame (508);

the connecting frame comprises a connecting frame body (508), wherein the periphery of the upper surface of the connecting frame body is fixedly provided with placing blocks (509), the number of the placing blocks (509) is four, the surface of the placing blocks (509) is provided with limiting grooves, one side of each limiting groove is provided with clamping grooves, limiting columns (510) are placed in the limiting grooves, two sides of one side of the surface of each limiting column (510) are fixedly provided with L-shaped connecting rods (511), the L-shaped connecting rods (511) are placed in the clamping grooves, one ends of the four L-shaped connecting rods (511) are fixedly provided with a protection frame (16), and the center of the lower surface of each protection frame (16) is fixedly connected with a second connecting seat;

a first clamping plate is fixedly arranged on one side of the placement block (509), a second clamping plate is fixedly arranged on the upper surface of the first clamping plate, a sliding column (512) is connected to the surface of the second clamping plate in a sliding manner, a pushing handle is fixedly arranged at one end of the sliding column (512), a plugging groove (513) is formed in the surface of the limiting column (510), and the plugging groove (513) is matched with the sliding column (512);

the stabilizing device comprises a stabilizing mechanism (6), wherein the stabilizing mechanism comprises limiting sliding grooves (601) which are formed in two sides of the inner side wall of a first placing groove (3), the limiting sliding grooves (601) are four in number, sliding blocks are slidably connected in the limiting sliding grooves (601), first spherical joints (602) are fixedly arranged on the surfaces of the sliding blocks, third telescopic columns (603) are rotatably connected with the first spherical joints (602), buffer springs are fixedly arranged on the inner bottom walls of the outer columns of the third telescopic columns (603), one ends of the buffer springs are lapped on the inner bottom walls of the inner columns of the third telescopic columns (603), the other ends of the third telescopic columns (603) are rotatably connected with second spherical joints, and the second spherical joints are fixedly arranged on the outer columns of the first telescopic columns (506).

2. The solar power generation device according to claim 1, wherein clamping springs (11) are fixedly installed on two sides of an inner side wall of the protection frame (16), a supporting plate (12) is fixedly installed on one side surface of each clamping spring (11), a solar panel (13) is placed in the middle of each supporting plate (12), the solar panel (13) is electrically connected with the solar storage battery (8) through a wire, and a closing plate is rotatably connected to one side of the protection frame (16).

3. The solar power generation device according to claim 1, wherein the damping mechanism (7) comprises damping dampers (701) fixedly mounted on two sides of the inner bottom wall of the second placing groove (4), a bearing plate (702) is fixedly mounted on the upper surface of each damping damper (701), a groove is formed in the upper surface of each bearing plate (702), a solar storage battery (8) is placed in each groove, first connecting pieces (703) are fixedly mounted on two sides of the lower surface of each bearing plate (702), a fourth telescopic column (704) is rotatably connected to the first connecting pieces (703), damping springs (705) are fixedly mounted in the fourth telescopic column (704), a second connecting piece (706) is rotatably connected to one end of each fourth telescopic column (704), and each second connecting piece (706) is fixedly mounted on the inner side wall of the second placing groove (4).

4. The solar power generation device according to claim 1, wherein the universal wheels (14) are fixedly arranged on the lower surface of the movable bottom plate (1), a handle is fixedly arranged on one side surface of the bearing box (2), and heat dissipation holes (15) are formed in two sides of the inner side wall of the second placing groove (4).