An encapsulation machine for a solar cell module

Abstract

The present invention discloses a packaging machine for solar cell modules, which is provided with a processing table. The upper end surface of the processing table is fitted with a lower housing, and the upper end surface of the solar panel is provided with an upper housing. The upper end surface of the processing table is fixedly covered with a protective cover. The output shaft of the motor is connected with a lead screw, and a fixing rod penetrates through the plate at the upper end of the other end of the support frame; it includes: a pressing mechanism, which is arranged below both ends of the support frame, and the pressing mechanism moves and presses on the upper housing; an air outlet assembly, which is symmetrically arranged at both side edges of the processing table. For this packaging machine for solar cell modules, when packaging the solar panel, the vibration mechanism can be used to accelerate the discharge of air bubbles in the sealing film, thereby improving the tightness of the connection of the housing. And before packaging, the sealing film is heated by hot air, and during the packaging process, the sealing film is cured by cold air, and the gas is automatically switched, improving the packaging efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of solar cell assembly packaging, in particular to a packaging machine for solar cell assemblies. Background Art

[0002] The solar cell module is composed of components such as solar cells, packaging materials and metal frames. The metal frames are softened by heating the sealing film and then assembled by applying pressure to complete the packaging of the solar cells. For example, a solar cell module packaging device with publication number CN204516789U includes a workbench supported by legs, and a square frame support frame is arranged on the workbench; an extrusion rod is arranged on the left short side of the support frame, and a support rod parallel to the extrusion rod is arranged on the right short side of the support frame. Two first cylinders for pushing the extrusion rod to move toward the support rod are arranged on the left side of the workbench through a cylinder seat; the frame packaging operation can be performed on solar photovoltaic modules of various sizes, the structure is simple, the operation is convenient, and the versatility is strong. During the frame assembly process, the aluminum frame is evenly stressed, and there will be no quality problems such as aluminum bowing and module self-explosion. On the basis of ensuring the safety of photovoltaic module products, the packaging efficiency is improved;

[0003] For example, the publication number CN208596688U is a heat sealing device and solar cell assembly for solar cell assemblies, the heat sealing device includes a conveyor belt for conveying the solar cell assembly to be packaged, a heating module for heating the sealing film of the solar cell assembly to be packaged, and an upper pressing wheel and a lower pressing wheel for pressing the solar cell assembly to be packaged from opposite sides thereof, the heating module, the upper pressing wheel and the lower pressing wheel are sequentially arranged along the conveying direction of the solar cell assembly to be packaged. The upper pressing wheel and the lower pressing wheel can gradually press the solar cell assembly conveyed forward, and bubbles can be driven out during the pressing process, so that the packaging of the solar cell assembly can be completed without vacuum conditions, which simplifies the packaging process and saves packaging costs. However, the above-mentioned packaging machine still has the following disadvantages during actual use:

[0004] 1. Although the above packaging machine can realize the packaging of solar panels, a large number of bubbles will exist in the sealing film after it is softened by heat during the packaging process. The packaging is only achieved by applying pressure to the shell, and there is no structure to eliminate bubbles, which makes it difficult to discharge the bubbles in the sealing film, affecting the tightness of the shell connection;

[0005] 2. At the same time, the sealing film needs to be heated before packaging, but it does not need to be heated during the packaging process. The sealing film needs to be cooled to accelerate its curing. However, the traditional sealing machine is not convenient enough for switching gases, which affects the packaging efficiency.

[0006] In view of the above problems, it is urgent to innovate and design on the basis of the original encapsulation machine. Summary of the Invention

[0007] The purpose of the present invention is to provide an encapsulation machine for solar cell modules, so as to solve the problems in the above background technology that in the encapsulation process of traditional encapsulation machines, there will be a large number of bubbles after the sealing film is heated and softened, there is only a structure that presses on the shell to achieve encapsulation, lacks a structure to eliminate bubbles, and the switching of gases is not convenient enough, affecting the encapsulation efficiency.

[0008] To achieve the above purpose, the present invention provides the following technical solution: An encapsulation machine for solar cell modules is provided with a processing table, the upper end surface of the processing table is fitted with a lower shell, and a solar panel is placed inside the lower shell. An upper shell is arranged on the upper end surface of the solar panel, and a sealing film is arranged between the upper shell and the lower shell. The upper end surface of the processing table is fixedly covered with a protective cover, and a motor is installed on the side surface of the protective cover through bolts. The output shaft of the motor is connected with a lead screw, and the outer side of the lead screw is threadedly connected with a plate above one end of the support frame. A fixing rod penetrates through the plate at the other upper end of the support frame, and the fixing rod is fixed inside the protective cover;

[0009] Including: a pressing mechanism, arranged below both ends of the support frame, the pressing mechanism moves and presses on the upper shell to realize the encapsulation of the lower shell and the upper shell on the solar panel;

[0010] An air outlet assembly, symmetrically arranged at both side edges of the processing table, the air outlet assembly blows hot air between the lower shell and the upper shell to soften the sealing film for the encapsulation of the lower shell and the upper shell, and the air outlet assembly blows cold air between the lower shell and the upper shell to quickly solidify the sealing film after being pressed, completing the encapsulation of the lower shell and the upper shell.

[0011] Preferably, the lead screw is symmetrically provided with thread grooves with opposite directions at both ends. The support frame and the fixing rod are slidably connected, and the moving directions of the two support frames are opposite. When the lead screw rotates, it can drive the two support frames to approach or move away from each other, and drive the support frame to slide on the fixing rod.

[0012] Preferably, the pressing mechanism includes a movable shaft rotatably penetrating through the lower end of the support frame, and pressing wheels are fixedly sleeved at both ends of the movable shaft. And vibration mechanisms are arranged on the sides of both pressing wheels. When the support frame moves, it can drive the pressing wheels to press on the shell, and drive the movable shaft, the pressing wheels and the connecting wheels to rotate through their contact.

[0013] Preferably, the vibration mechanism includes a connecting wheel arranged on the side of the pressing wheel. Fixed blocks are arranged at equal angles on the side surface of the connecting wheel. A fixing plate is fixed on the support frame above the connecting wheel. At the same time, a connecting block is fixed on the lower end surface of the fixing plate. When the connecting wheel rotates, it drives the fixed blocks to rotate synchronously and can contact the connecting block to generate vibration.

[0014] Preferably, the air outlet assembly includes fixed boxes fixed on both sides of the processing table. A movable plate is rotatably arranged inside the fixed box. One end of the movable plate close to the solar panel is of an inclined structure. At the same time, balls are evenly embedded on the inclined surface. A spring is arranged at the rotation part of the movable plate and the fixed box. When the housing and the solar panel are placed on the processing table, they can contact the movable plate, and the rotation of the movable plate can play a role in correcting the position of the solar panel.

[0015] Preferably, hot air pipes are fixed at both ends of the fixed box. Cold air pipes are arranged at both ends of the fixed box on the side away from the solar panel. The hot air pipes and the cold air pipes are perpendicular to each other. External hot air or cold air can be transmitted into the fixed box through the hot air pipes and the cold air pipes respectively.

[0016] Preferably, support shafts penetrate through both ends of the fixed box. The support shafts are rotatably connected to the fixed box. A connecting plate is fixed at the top of the support shaft. At the same time, the upper end cross section of the connecting plate is of an "L" - shaped structure. When the connecting plate is pushed to rotate, it can drive the blocking block to rotate synchronously through the support shaft.

[0017] Preferably, a fixed cavity is formed inside the fixed box. The fixed cavity is alternately communicated with the hot air pipes and the cold air pipes. Equal - spaced air outlet holes are reserved on one side of the fixed box close to the solar panel. When hot air or cold air enters the fixed cavity in the fixed box, it can be blown between the housings from the air outlet holes.

[0018] Preferably, a blocking block is fixed on the side surface of the support shaft through a rod. The surface of the blocking block is of an arc - surface structure. The surface of the blocking block fits and slides with the inner walls at both ends of the fixed box. At the same time, the inner walls at both ends of the fixed box are of an arc - surface structure. The blocking block can block the hot air pipes or the cold air pipes respectively to ensure that only one kind of gas enters each time.

[0019] Preferably, a guiding rod is fixed at one end of the fixing plate away from the support frame. The guiding rod is of an inverted "L" - shaped structure. The bottom end of the guiding rod is at the same height as the horizontal axis of the connecting plate. When the support frame moves, it can drive the guiding rod to move synchronously through the fixing plate and contact the connecting plate to push it to rotate.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: When encapsulating the solar panel with this encapsulating machine for solar cell modules, the vibration mechanism can accelerate the discharge of air bubbles in the sealing film, thereby improving the tightness of the connection of the housing. Before encapsulation, the sealing film is heated by hot air, and during the encapsulation process, cold air is used to accelerate the curing of the sealing film, and the gas is automatically switched, improving the encapsulation efficiency. The specific content is as follows:

[0021] 1. Through the threaded transmission between the lead screw and the support frame, the two support frames are driven to approach each other. After the support frames move, the pressure wheels are driven to press on the edge of the housing. Therefore, the housing can be tightly pressed by two sets of approaching pressure wheels to complete the encapsulation of the solar panel;

[0022] Furthermore, when the pressure wheel moves and contacts the housing, it can rotate. When rotating, it can drive the connecting wheel to rotate synchronously. The connecting wheel drives the fixed block to rotate. During the rotation process, it contacts the connecting block. Vibration can be generated through the contact between the fixed block and the connecting block, and the vibration is transmitted to the pressure wheel. In this way, during the movement of the pressure wheel, the housing can also be extruded through vibration, which can accelerate the discharge of air bubbles in the sealing film and improve the tightness after the connection of the housing;

[0023] 2. Hot air can be discharged from the air outlet holes and blown between the upper housing and the lower housing to heat the sealing film to make it soft. After softening, the housing is pressed by the movement of the pressure wheel. The movement of the support frame drives the guide rod to move synchronously. When the guide rod moves to contact the connecting plate, it can push the connecting plate to rotate 90°. Then, the support shaft and the blocking block are driven to rotate. At this time, the blocking block that blocks the cold air pipe changes to block the hot air pipe. When the support frame moves, hot air stops entering the fixed box, and cold air enters the fixed box through the cold air pipe. Then, during the process of pressing and encapsulating the housing, the cold air discharged through the air outlet holes blows between the housings, which can accelerate the curing of the sealing film and improve the encapsulation efficiency;

[0024] Furthermore, when the air supply stops after encapsulation and the support frame moves in the reverse direction, the guide rod can also be driven to contact the connecting plate and push it to rotate 90° in the reverse direction, driving the blocking block to release the blockage of the hot air pipe and re-block the cold air pipe, so as to continuously supply air during the subsequent encapsulation of the solar panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a front view structural schematic diagram of the present invention;

[0026] Figure 2 is a front sectional structural schematic diagram of the housing of the present invention;

[0027] Figure 3 is a front view structural schematic diagram of the support frame of the present invention;

[0028] Figure 4 is a side view structural schematic diagram of the support frame of the present invention;

[0029] Figure 5 This is the schematic diagram of the bottom view of the connecting wheel of the present invention;

[0030] Figure 6 This is the schematic diagram of the top view of the fixed box of the present invention;

[0031] Figure 7 This is the schematic diagram of the side sectional view of the fixed box of the present invention;

[0032] Figure 8 This is the schematic diagram of the top sectional view of the fixed box of the present invention;

[0033] Figure 9 This is the present invention Figure 8 The enlarged schematic diagram of part A in;

[0034] Figure 10 This is the schematic diagram of the structure after the connecting plate of the present invention rotates.

[0035] In the figure: 1, processing table; 2, lower housing; 3, solar panel; 4, upper housing; 5, protective cover; 6, motor; 7, lead screw; 8, support frame; 9, fixed rod; 10, movable shaft; 11, pressure wheel; 12, connecting wheel; 13, fixed block; 14, fixing plate; 15, connecting block; 16, guide rod; 17, fixed box; 18, movable plate; 19, ball; 20, hot air pipe; 21, cold air pipe; 22, support shaft; 23, connecting plate; 24, fixed cavity; 25, air outlet; 26, blocking block. Specific embodiments

[0036] 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.

[0037] Please refer to Figures 1 - 10 , the present invention provides the following technical solutions:

[0038] Embodiment 1: To solve the problems existing in the prior art, this embodiment adopts the following technical solution. An encapsulation machine for a solar cell module is provided with a processing table 1. A lower housing 2 is attached to the upper end surface of the processing table 1, and a solar panel 3 is placed inside the lower housing 2. An upper housing 4 is arranged on the upper end surface of the solar panel 3, and a sealing film is provided between the upper housing 4 and the lower housing 2. A protective cover 5 is fixedly covered on the upper end surface of the processing table 1, and a motor 6 is installed on the side surface of the protective cover 5 through bolts. The output shaft of the motor 6 is connected to a lead screw 7, and the outer side of the lead screw 7 is threadedly connected to a plate above one end of a support frame 8. A fixing rod 9 penetrates through the plate at the upper end of the other end of the support frame 8, and the fixing rod 9 is fixed inside the protective cover 5; it includes: a pressing mechanism, arranged below both ends of the support frame 8, and the pressing mechanism moves and presses on the upper housing 4 to realize the encapsulation of the solar panel 3 by the lower housing 2 and the upper housing 4; an air outlet assembly, symmetrically arranged at the two side edges of the processing table 1, and the air outlet assembly blows hot air between the lower housing 2 and the upper housing 4 to soften the sealing film, so as to facilitate the encapsulation of the lower housing 2 and the upper housing 4. The air outlet assembly blows cold air between the lower housing 2 and the upper housing 4 to quickly solidify the sealing film after being pressed, and complete the encapsulation of the lower housing 2 and the upper housing 4.

[0039] During the encapsulation process of the existing encapsulation machine, there will be a large number of bubbles in the sealing film after it is heated and softened. There is only a structure for pressing the housing to achieve encapsulation, lacking a structure for eliminating bubbles, resulting in the bubbles in the sealing film being not easily discharged, affecting the tightness of the connection between the housings, such as Figures 1 - 5As shown in the figure, threaded grooves with opposite directions at both ends are symmetrically arranged on the lead screw 7. The support frame 8 and the fixed rod 9 are slidably connected, and the moving directions of the two support frames 8 are opposite. The pressing mechanism includes a movable shaft 10 that rotates through the lower end of the support frame 8, and pressing wheels 11 are fixedly sleeved at both ends of the movable shaft 10. Vibration mechanisms are arranged on the sides of both pressing wheels 11. The vibration mechanism includes a connecting wheel 12 arranged on the side of the pressing wheel 11. Fixed blocks 13 are arranged at equal angles on the side surface of the connecting wheel 12. A fixed plate 14 is fixed on the support frame 8 above the connecting wheel 12. At the same time, a connecting block 15 is fixed on the lower end surface of the fixed plate 14. First, the sealing film is arranged between the lower shell 2 and the upper shell 4. Then, the lower shell 2, the solar panel 3, and the upper shell 4 are placed on the processing table 1. After heating and softening the sealing film between the shells, the motor 6 drives the lead screw 7 to rotate. Through the threaded transmission between the lead screw 7 and the support frame 8, the two support frames 8 are driven to approach each other. And the support frame 8 can slide on the fixed rod 9 to maintain the stability during movement. After the support frame 8 moves, it drives the pressing wheel 11 to press on the edge of the shell. And the contact between the pressing wheel 11 and the shell can drive the pressing wheel 11 to rotate by itself. Therefore, the two sets of pressing wheels 11 approaching each other can realize the pressing of the shell, and the encapsulation of the solar panel 3 is completed. When the pressing wheel 11 rotates, it can drive the connecting wheel 12 to rotate synchronously. The connecting wheel 12 drives the fixed block 13 to rotate. During the rotation process, it contacts the connecting block 15. Vibration can be generated through the contact between the fixed block 13 and the connecting block 15, and the vibration is transmitted to the pressing wheel 11. In this way, the pressing wheel 11 can also extrude the shell through vibration during movement, which can accelerate the discharge of air bubbles in the sealing film and improve the tightness after the connection of the shells.

[0040] Embodiment 2: Before encapsulation, the existing encapsulator needs to heat the sealing film, and during the encapsulation process, it is not necessary to heat the sealing film. It is necessary to cool the sealing film to accelerate its curing. However, the traditional sealing machine is not convenient enough for gas switching, which affects the encapsulation efficiency. Therefore, this embodiment adopts the following technical solutions, such as Figure 1 and Figures 6 - 10As shown in the figure, the air outlet assembly includes fixed boxes 17 fixed on both sides of the processing table 1. An activity plate 18 is rotatably arranged inside the fixed box 17. One end of the activity plate 18 close to the solar panel 3 is of an inclined structure, and balls 19 are evenly embedded on the inclined surface. A spring is arranged at the rotation position of the activity plate 18 and the fixed box 17. Heat pipes 20 are fixed at both ends of the fixed box 17. Cold air pipes 21 are arranged at both ends of the fixed box 17 on the side away from the solar panel 3. The heat pipes 20 and the cold air pipes 21 are perpendicular to each other. Support shafts 22 penetrate through both ends of the fixed box 17. The support shafts 22 are rotatably connected to the fixed box 17. A connecting plate 23 is fixed at the top of the support shaft 22. The upper end cross-section of the connecting plate 23 is of an "L" - shaped structure. A fixed cavity 24 is formed inside the fixed box 17. The fixed cavity 24 is alternately communicated with the heat pipes 20 and the cold air pipes 21. Air outlet holes 25 are reserved at equal intervals on the side of the fixed box 17 close to the solar panel 3. A blocking block 26 is fixed on the side surface of the support shaft 22 through a rod body. The surface of the blocking block 26 is of an arc structure. The surface of the blocking block 26 fits and slides with the inner walls at both ends of the fixed box 17. The inner walls at both ends of the fixed box 17 are of an arc structure. One end of the fixed plate 14 away from the support frame 8 is fixed with a guiding rod 16. The guiding rod 16 is of an inverted "L" - shaped structure. The bottom end of the guiding rod 16 is at the same height as the horizontal axis of the connecting plate 23. When the solar panel 3 and the housing are placed on the processing table 1, first, the edge of the housing is driven to contact the activity plate 18, and the activity plate 18 is pushed to rotate. The balls 19 on the activity plate 18 can accelerate the falling of the housing and the solar panel 3. Then, through the spring arranged at the rotation position of the activity plate 18, the positions of the falling solar panel 3 and the housing can be corrected to ensure that they are in the middle of the processing table 1. Before encapsulating the solar panel 3, hot air enters the fixed cavity 24 in the fixed box 17 from the heat pipes 20, and then the hot air can be discharged from the air outlet holes 25 and blown between the upper housing 4 and the lower housing 2 to heat the sealing film and soften it. After softening, the support frame 8 moves to drive the guiding rod 16 to move synchronously. When the guiding rod 16 moves to contact the connecting plate 23, it can push the connecting plate 23 to rotate 90°. Then, the support shaft 22 and the blocking block 26 are driven to rotate. At this time, the blocking block 26 blocking the cold air pipe 21 changes to blocking the heat pipe 20. When the support frame 8 moves, hot air stops entering the fixed box 17. Cold air enters the fixed box 17 through the cold air pipes 21. Then, during the process of pressing and encapsulating the housing, the cold air discharged from the air outlet holes 25 blows between the housings, which can accelerate the curing of the sealing film and improve the encapsulation efficiency. When the encapsulation is completed and the air supply stops, the support frame 8 moves in the reverse direction. Similarly, it can drive the guiding rod 16 to contact the connecting plate 23 and push the connecting plate 23 to rotate, driving the blocking block 26 to release the blockage of the heat pipe 20 and re - block the cold air pipe 21 for continuous air supply during the subsequent encapsulation of the solar panel 3.

[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A packaging machine for solar cell modules, comprising a processing table (1), a lower shell (2) being fitted on the upper end surface of the processing table (1), a solar panel (3) being placed on the inner side of the lower shell (2), an upper shell (4) being provided on the upper end surface of the solar panel (3), a sealing film being provided between the upper shell (4) and the lower shell (2), a protective cover (5) being provided on the upper end surface fixed cover of the processing table (1), and a motor (6) being installed on the side of the protective cover (5) by bolts, a screw rod (7) being connected to the output shaft of the motor (6), and the outer side of the screw rod (7) being threadedly connected to a plate above one end of a support frame (8), a fixing rod (9) being passed through the interior of the plate above the other end of the support frame (8), and the fixing rod (9) being fixed to the inner side of the protective cover (5); It is characterized in that include: A pressure mechanism is arranged below the two ends of the support frame (8), and the pressure mechanism applies pressure by moving on the upper shell (4), thereby achieving encapsulation of the solar panel (3) by the lower shell (2) and the upper shell (4); An air outlet assembly is symmetrically arranged at the edges of both sides of the processing table (1), wherein the air outlet assembly blows hot air between the lower shell (2) and the upper shell (4) to soften the sealing film, thereby facilitating the sealing of the lower shell (2) and the upper shell (4), and the air outlet assembly blows cold air between the lower shell (2) and the upper shell (4), thereby causing the sealing film to solidify quickly after being pressurized, thereby completing the sealing of the lower shell (2) and the upper shell (4); The pressure mechanism comprises a movable shaft (10) which rotates and passes through the lower end of the support frame (8), and fixed sleeves at both ends of the movable shaft (10) are provided with pressure wheels (11), and the sides of the two pressure wheels (11) are both provided with vibration mechanisms.

2. A solar cell assembly packaging machine according to claim 1, characterized in that: The screw rod (7) is symmetrically provided with thread grooves at both ends with opposite directions. The support frame (8) and the fixed rod (9) are slidably connected, and the movement directions of the two support frames (8) are opposite.

3. A solar cell assembly packaging machine according to claim 1, characterized in that: The vibration mechanism comprises a connecting wheel (12) arranged on the side of the pressure wheel (11), and a fixing block (13) is arranged at an equal angle on the side of the connecting wheel (12), and a fixing plate (14) is fixed on the support frame (8) above the connecting wheel (12), and a connecting block (15) is fixed on the lower end surface of the fixing plate (14).

4. A solar cell assembly packaging machine according to claim 1, characterized in that: The air outlet assembly comprises a fixed box (17) fixed to both sides of the processing table (1), and a movable plate (18) is rotatably arranged inside the fixed box (17), and one end of the movable plate (18) close to the solar panel (3) is an inclined structure, and balls (19) are evenly embedded on the inclined surface, and a spring is arranged at the rotating position of the movable plate (18) and the fixed box (17).

5. A solar cell assembly packaging machine according to claim 4, characterized in that: Hot air pipes (20) are fixed to both ends of the fixing box (17), and cold air pipes (21) are provided at both ends of the fixing box (17) on a side away from the solar panel (3), and the hot air pipes (20) and the cold air pipes (21) are perpendicular to each other.

6. A solar cell assembly packaging machine according to claim 5, characterized in that: Support shafts (22) penetrate both ends of the fixed box (17), and the support shaft (22) and the fixed box (17) are rotatably connected. A connecting plate (23) is fixed on the top of the support shaft (22), and the upper end cross-section of the connecting plate (23) is an "L"-shaped structure.

7. A solar cell assembly packaging machine according to claim 6, characterized in that: The fixing box (17) has a fixing cavity (24) formed inside, and the fixing cavity (24) is alternately connected to the hot air pipe (20) and the cold air pipe (21), and air outlet holes (25) are reserved at equal intervals on one side of the fixing box (17) close to the solar panel (3).

8. A solar cell assembly packaging machine according to claim 7, characterized in that: A blocking block (26) is fixed to the side surface of the support shaft (22) via a rod body, and the surface of the blocking block (26) is a curved surface structure, and the surface of the blocking block (26) slides in contact with the inner walls at both ends of the fixed box (17), and the inner walls at both ends of the fixed box (17) are both curved surface structures.

9. A solar cell assembly packaging machine according to claim 3, characterized in that: A guide rod (16) is fixed to one end of the fixing plate (14) away from the support frame (8), and the guide rod (16) is an inverted "L"-shaped structure, and the bottom end of the guide rod (16) is at the same height as the horizontal axis of the connecting plate (23).

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