A protective plate bending and shaping device

Abstract

This utility model relates to the field of battery manufacturing technology and discloses a protection board bending and shaping device, including a conveying mechanism, and a bending mechanism and a shaping mechanism arranged sequentially along the conveying direction of the conveying mechanism. The shaping mechanism includes a support unit and a shaping unit, both of which are located on one side of the conveying mechanism. The shaping unit includes a first shaping component, a second shaping component, and a first driving component. The first shaping component and the second shaping component are both connected to the driving end of the first driving component. The first shaping component is used for shaping the protection board, and the second shaping component is used for shaping the solder pads on the protection board. This utility model achieves the following technical effects: by shaping the battery protection board and the protection board solder pads by the first shaping component and the second shaping component respectively, the consistency of battery products is improved, and the performance stability and product quality of the battery are guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of battery production technology, specifically relating to a protective plate bending and shaping device. Background Technology

[0002] During the production of steel-cased batteries, the positive and negative terminals at the battery's head need to be connected to a protection board to achieve electrical connection between the battery and external devices. The protection board typically has positive and negative electrode pads welded on it. Electrical connection between the protection board and the positive and negative terminals is achieved by welding these pads to the battery's positive and negative terminals respectively. In some special production scenarios, it is necessary to first weld the negative electrode pad to the battery's negative terminal, then bend the protection board 180 degrees so that the positive electrode pad on the protection board fits against the battery's positive electrode surface, and then perform the welding operation on the positive electrode pad.

[0003] However, existing technologies do not disclose protective board bending equipment specifically designed for the aforementioned special production scenarios, and existing protective board bending equipment also lacks a mechanism for shaping the solder pads of the bent protective board. If the solder pads of the protective board are not properly shaped after bending, it will not only affect the consistency of the battery products but also their performance and quality. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model provides a protective board bending and shaping device. The device uses a first shaping component to shape the battery protective board and a second shaping component to shape the protective board pads. This allows both the protective board and the protective board pads to be shaped in a standardized manner, which can improve the consistency of battery products, maintain the normal performance of the battery, and ensure product quality.

[0005] The technical effects to be achieved by this utility model are realized through the following technical aspects:

[0006] This utility model provides a protective plate bending and shaping device, including a conveying mechanism, and a bending mechanism and a shaping mechanism arranged sequentially along the conveying direction of the conveying mechanism. The shaping mechanism includes a support unit and a shaping unit, and the support unit and the shaping unit are both located on one side of the conveying mechanism.

[0007] The shaping unit includes a first shaping component, a second shaping component, and a first driving component. The first shaping component and the second shaping component are both connected to the driving end of the first driving component. The first shaping component is used for shaping the protection board, and the second shaping component is used for shaping the pads on the protection board.

[0008] As a further description of the technical solution of this utility model, the first shaping component includes a pressing block and a first driving member for driving the pressing block to move in a vertical direction, and the second shaping component includes a first pushing block and a second driving member for driving the first pushing block to move in a horizontal direction.

[0009] As a further description of the technical solution of this utility model, pressure sensors are provided on both the pressing block and the first pushing block.

[0010] As a further description of the technical solution of this utility model, the shaping mechanism also includes a pre-shaping unit disposed on one side of the support unit. The pre-shaping unit is used for pre-shaping the protective plate. The pre-shaping unit includes a second push block and a second driving component for driving the second push block to move in the horizontal direction.

[0011] As a further description of the technical solution of this utility model, the support unit includes a shaping support block and a third driving component for driving the shaping support block to move in the vertical direction.

[0012] As a further description of the technical solution of this utility model, the bending mechanism includes a bending unit and a limiting unit. The bending unit is disposed on one side of the conveying mechanism, and the limiting unit is disposed above the conveying mechanism.

[0013] The bending unit includes a bending support block, a bending clamping assembly, a fourth drive assembly, and a fifth drive assembly. The bending support block and the bending clamping assembly are both connected to the drive end of the fourth drive assembly. The drive end of the fifth drive assembly is connected to the fixed end of the fourth drive assembly. The fifth drive assembly is used to drive the bending support block and the bending clamping assembly to move closer to or away from the conveying mechanism. The fourth drive assembly is used to drive the bending support block and the bending clamping assembly to rotate. The limiting unit is used to limit the clamping action of the bending clamping assembly.

[0014] As a further description of the technical solution of this utility model, the bending clamping assembly includes a clamping block, a third driving member for driving the clamping block to move in a direction parallel to the bending support block, and a fourth driving member for driving the clamping block to move in a direction perpendicular to the bending support block.

[0015] As a further description of the technical solution of this utility model, the bending support block is provided with an adsorption element on the end face that contacts the protective plate.

[0016] As a further description of the technical solution of this utility model, the limiting unit includes a limiting block and a sixth driving component for driving the limiting block to move in the vertical direction.

[0017] As a further description of the technical solution of this utility model, the conveying mechanism includes a drive unit, a guide rail and multiple carrier trolleys, the carrier trolleys are slidably connected to the guide rail, and the drive unit is used to drive the carrier trolleys to move horizontally along the guide rail.

[0018] In summary, this utility model has at least the following advantages:

[0019] The protective plate bending and shaping equipment provided by this utility model, by setting a first shaping component and a second shaping component to perform bending and shaping operations on the battery protective plate and the protective plate solder pads respectively, ensures that the protective plate and the protective plate solder pads are uniformly shaped, which not only improves the consistency and aesthetics of the battery products, but also ensures the stability of the battery product performance and improves the quality of the battery products. By simultaneously driving the first shaping component and the second shaping component to move their positions, the relative positions of the first shaping component and the second shaping component remain unchanged, which helps to improve the accuracy of the shaping operation and further improves production quality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the protective plate bending and shaping equipment according to Embodiment 1 of this utility model;

[0021] Figure 2 This is a schematic diagram of the shaping unit in Embodiment 1 of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the first shaping component and the second shaping component in Embodiment 1 of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the support unit and the pre-shaping unit in Embodiment 2 of this utility model;

[0024] Figure 5 This is a schematic diagram of the protective plate bending and shaping equipment of Embodiment 3 of this utility model;

[0025] Figure 6 This is a schematic diagram of the bending unit in Embodiment 3 of this utility model;

[0026] Figure 7 This is a schematic diagram of the bending support block and bending clamp assembly of Embodiment 3 of this utility model;

[0027] Figure 8 for Figure 7 Enlarged view of section A;

[0028] Figure 9 This is a schematic diagram of the limiting unit in Embodiment 3 of this utility model;

[0029] Figure 10 This is a schematic diagram of the conveying mechanism in Embodiment 3 of this utility model;

[0030] Figure 11 This is a schematic diagram of the battery assembly in Embodiment 3 of this utility model.

[0031] Marked in the image:

[0032] 1. Conveying mechanism; 11. Drive unit; 12. Guide rail; 13. Carrying trolley;

[0033] 2. Bending mechanism; 21. Bending unit; 211. Bending support block; 2111. Adsorption component; 212. Bending clamping assembly; 2121. Clamping block; 2122. Third driving component; 2123. Fourth driving component; 213. Fourth driving assembly; 214. Fifth driving assembly; 22. Limiting unit; 221. Limiting block; 222. Sixth driving assembly;

[0034] 3. Shaping mechanism; 31. Support unit; 311. Shaping support block; 312. Third drive assembly; 32. Shaping unit; 321. First shaping assembly; 3211. Pressing block; 3212. First drive component; 322. Second shaping assembly; 3221. First push block; 3222. Second drive component; 323. First drive assembly; 33. Pre-shaping unit; 331. Second push block; 332. Second drive assembly;

[0035] 4. Pressure sensor; 100. Battery; 200. Clamp; 300. Protection board. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of this utility model.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] Example 1

[0039] refer to Figures 1 to 3The protective plate bending and shaping equipment provided in this embodiment includes a conveying mechanism 1, and a bending mechanism 2 and a shaping mechanism 3 arranged sequentially along the conveying direction of the conveying mechanism 1. The shaping mechanism 3 includes a support unit 31 and a shaping unit 32, both of which are located on one side of the conveying mechanism 1. The support unit 31 is used to support the battery head during the shaping process.

[0040] The shaping unit 32 includes a first shaping component 321, a second shaping component 322, and a first driving component 323. Both the first shaping component 321 and the second shaping component 322 are connected to the driving end of the first driving component 323. The first shaping component 321 is used for shaping the protection board, the second shaping component 322 is used for shaping the pads on the protection board, and the first driving component 323 is used to drive the first shaping component 321 and the second shaping component 322 to move simultaneously. The first driving component 323 can be a robotic arm. The first shaping component 321 and the second shaping component 322 can perform shaping operations simultaneously or sequentially.

[0041] During operation, the battery is first conveyed to the bending mechanism 2 via the conveying mechanism 1. The bending mechanism 2 bends the battery protection board. Then, the conveying mechanism 1 continues to convey the battery to the shaping mechanism 3. The first driving component 323 drives the first shaping component 321 and the second shaping component 322 to approach the battery protection board simultaneously. The first shaping component 321 first shapes the protection board, and then the second shaping component 322 shapes the protection board pads. The first shaping component 321 and the second shaping component 322 hold pressure for a moment to complete the shaping operation of the protection board and the protection board pads.

[0042] The first shaping component 321 and the second shaping component 322 perform bending and shaping operations on the protection board and its solder pads, respectively, ensuring that both the protection board and its solder pads are uniformly shaped. This not only improves the consistency and aesthetics of the battery product but also guarantees the battery's stable performance, thus enhancing product quality. Furthermore, the first driving component 323 drives the first shaping component 321 and the second shaping component 322 to move simultaneously, ensuring that their relative positions remain constant, which helps improve the accuracy of the shaping operation.

[0043] In some embodiments, the first shaping component 321 includes a pressing block 3211 and a first driving member 3212 for driving the pressing block 3211 to move vertically, and the second shaping component 322 includes a first pushing block 3221 and a second driving member 3222 for driving the first pushing block 3221 to move horizontally. Both the first driving member 3212 and the second driving member 3222 can be electric cylinders.

[0044] It should be noted that before the bending operation, the protection board is connected to the negative terminal of the battery via solder pads. At this time, the solder pads of the protection board are in a flat state, and the protection board is located on the outside of the battery head and on the same plane as the battery body. After the bending operation, the solder pads of the protection board are bent 180 degrees, and the protection board is flipped 180 degrees and attached to the upper surface of the battery head. At this time, the bending point of the solder pads of the protection board is located on the side of the protection board away from the battery body. During the shaping operation, the lower pressure block 3211 moves vertically downward under the drive of the first driving member 3212 and presses against the upper surface of the bent protection board for pressure holding and shaping. The first push block 3221 moves horizontally towards the solder pads of the protection board under the drive of the second driving member 3222 and presses against the bending point of the solder pads of the protection board for pressure holding and shaping, so that the bending point of the solder pads of the protection board is straightened from an arc shape to a straight edge shape.

[0045] Since the pressure block 3211 and the first push block 3221 need to apply certain pressure to the protection board and the protection board pads respectively for pressure holding and shaping, as a further optimization, pressure sensors 4 can be installed on the pressure block 3211 and the first push block 3221. This allows for real-time monitoring of the pressure applied by the pressure block 3211 to the protection board and the pressure applied by the first push block 3221 to the protection board pads, preventing excessive pressure from the pressure block 3211 and the first push block 3221 that could damage the protection board and the protection board pads. In some embodiments, an RFID reader / writer component can also be installed at the shaping station to read the pressure value detected by the pressure sensor 4 and upload it to the information management system for subsequent traceability.

[0046] Example 2

[0047] As a further optimization of Example 1, refer to Figure 4 The shaping mechanism 3 also includes a pre-shaping unit 33 disposed on one side of the support unit 31. The pre-shaping unit 33 is used for pre-shaping the protective plate. The pre-shaping unit 33 includes a second push block 331 and a second drive assembly 332 for driving the second push block 331 to move horizontally towards the support unit 31. The second push block 331 is used to push against the outer edge of the bent protective plate. In this embodiment, the second drive assembly 332 includes a first drive cylinder for driving the second push block 331 to move in the X direction and a second drive cylinder for driving the second push block 331 to move in the Y direction, wherein the X direction is perpendicular to the Y direction.

[0048] The support unit 31 includes a shaping support block 311 and a third drive assembly 312 for driving the shaping support block 311 to move in the vertical direction. The third drive assembly 312 can be a drive cylinder.

[0049] During the shaping process, the shaping support block 311 moves vertically upward under the drive of the third drive assembly 312 and abuts against the lower surface of the battery head. Then, the second push block 331, driven by the second drive assembly 332, approaches the battery head and pushes against the outer edge of the bent protective plate, making the protective plate fit tightly against the battery head. Afterwards, the first shaping assembly 321 and the second shaping assembly 322 respectively perform shaping operations on the protective plate and the protective plate pads. By setting up a pre-shaping unit 33 to pre-shape the protective plate, the fit between the bent protective plate and the battery head can be made tighter, which can further improve the shaping quality of the subsequent shaping unit 32.

[0050] Example 3

[0051] As a further optimization of Example 1, refer to Figures 5 to 11 The bending mechanism 2 includes a bending unit 21 and a limiting unit 22. The bending unit 21 is located on one side of the conveying mechanism 1, and the limiting unit 22 is located above the conveying mechanism 1. The bending unit 21 includes a bending support block 211, a bending clamping assembly 212, a fourth drive assembly 213, and a fifth drive assembly 214. Both the bending support block 211 and the bending clamping assembly 212 are connected to the drive end of the fourth drive assembly 213, and the drive end of the fifth drive assembly 214 is connected to the fixed end of the fourth drive assembly 213. The fifth drive assembly 214 is used to drive the bending support block 211 and the bending clamping assembly 212 to simultaneously move closer to or further away from the conveying mechanism 1. The fourth drive assembly 213 is used to drive the bending support block 211 and the bending clamping assembly 212 to rotate simultaneously. The limiting unit 22 is used to limit the clamping action of the bending clamping assembly 212. In this embodiment, the fourth drive assembly 213 includes a rotary drive motor, and the fifth drive assembly 214 is a robotic arm.

[0052] In this embodiment, the bending support block 211 is used to fix and support the lower surface of the protective plate to be bent, and the bending clamp assembly 212 is used to press and fix the side of the protective plate away from the battery body. Under the rotational drive of the fourth drive assembly 213, the bending support block 211 and the bending clamp assembly 212 can cooperate to realize the bending operation of the protective plate. It should be noted that the bending clamp assembly 212 does not press against the protective plate throughout the entire bending operation. At the beginning of the bending operation, the bending support block 211 and the bending clamp assembly 212 jointly fix the protective plate to be bent and perform the bending operation. When the protective plate completes a 150-degree bend, the bending clamp assembly 212 will be removed to avoid interfering with the subsequent bending operation. Afterwards, the bending support block 211 alone continues to bend the protective plate to 180 degrees.

[0053] The bending clamping assembly 212 includes a clamping block 2121, a third driving member 2122 for driving the clamping block 2121 to move in a direction parallel to the bending support block 211, and a fourth driving member 2123 for driving the clamping block 2121 to move in a direction perpendicular to the bending support block 211. Both the third driving member 2122 and the fourth driving member 2123 can be driving cylinders. The third driving member 2122 is mainly used to enable the clamping block 2121 to extend and retract, while the fourth driving member 2123 is mainly used to enable the clamping block 2121 to contact and press against the side of the protective plate. In some embodiments, a buffer pad may be provided at the part of the clamping block 2121 that contacts the protective plate to protect the protective plate.

[0054] As a further optimization, the bending support block 211 has multiple adsorption elements 2111 on its end face that contacts the protective plate. The adsorption elements 2111 can be suction cups or suction holes. In this embodiment, the adsorption elements 2111 are suction cups. By using the adsorption elements 2111 to further adsorb and fix the protective plate, it is possible to prevent the protective plate from shifting position during bending, thereby further improving the quality of the bending operation.

[0055] The limiting unit 22 includes a limiting pressure block 221 and a sixth driving component 222 for driving the limiting pressure block 221 to move vertically. The sixth driving component 222 can be a driving cylinder. The limiting pressure block 221 is used to press against the upper surface of the protective plate to be bent, so as to limit the pressing action of the clamping block 2121. Since the clamping block 2121 is used to press against the side of the protective plate, the contact surface between the clamping block 2121 and the protective plate is small, making it difficult to ensure that the clamping block 2121 presses in place. Through the limiting action of the limiting pressure block 221, it can be ensured that the clamping block 2121 presses in place, while preventing the clamping block 2121 from pressing too hard and causing damage or deformation to the protective plate.

[0056] During the bending operation, the bending support block 211 first abuts against the lower surface of the protection plate to be bent and fixes the protection plate to be bent. Then, the limiting pressure block 221 presses against the upper surface of the protection plate to be bent. After that, the clamping block 2121 abuts against the limiting pressure block 221 and presses against the side of the protection plate to be bent away from the battery body. After the clamping block 2121 is pressed into place, the limiting pressure block 221 is removed and reset. The bending support block 211 and the clamping block 2121 cooperate to complete the bending operation of the protection plate.

[0057] In some embodiments, a pressure sensor can be installed on the limiting block 221 to monitor the pressure applied by the limiting block 221 to the protective plate, so as to prevent the limiting block 221 from being over-pressed. At the same time, the limiting unit 22 can also be connected to the horizontal moving module drive. When it is necessary to limit the clamping block 2121, the limiting unit 22 is driven to approach the protective plate by the horizontal moving module. After the limiting is completed, the limiting unit 22 is driven to withdraw and reset by the horizontal moving module, so as to avoid interfering with the bending operation of the bending unit 21.

[0058] In one embodiment, the conveying mechanism 1 includes a drive unit 11, a guide rail 12, and multiple carrier trolleys 13. The carrier trolleys 13 are slidably connected to the guide rail 12. The drive unit 11 drives the carrier trolleys 13 to move horizontally along the guide rail 12. The drive unit 11 may include a drive motor. Each carrier trolley 13 carries a battery, and each carrier trolley 13 is equipped with a fixing component for securing the carried object. In this embodiment, the carried object of the carrier trolley is a battery assembly, which includes a battery 100 and a clamp 200. The main body of the battery 100 is clamped in the clamp 200, while the head of the battery 100 and the protective plate 300 protrude from the outside of the clamp 200, allowing the bending mechanism 2 to perform bending operations and the shaping mechanism 3 to perform shaping operations.

[0059] In some implementations, the number of bending mechanism 2 and shaping mechanism 3 can be set to multiple. In this embodiment, the number of bending mechanism 2 is four and the number of shaping mechanism 3 is two, thereby improving the production efficiency of the battery.

[0060] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0061] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0062] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0063] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A protective plate bending and shaping device, characterized in that, It includes a conveying mechanism (1), and a bending mechanism (2) and a shaping mechanism (3) arranged sequentially along the conveying direction of the conveying mechanism (1). The shaping mechanism (3) includes a support unit (31) and a shaping unit (32). The support unit (31) and the shaping unit (32) are both located on one side of the conveying mechanism (1). The shaping unit (32) includes a first shaping component (321), a second shaping component (322), and a first driving component (323). The first shaping component (321) and the second shaping component (322) are both connected to the driving end of the first driving component (323). The first shaping component (321) is used for shaping the protection board, and the second shaping component (322) is used for shaping the pads on the protection board.

2. The protective plate bending and shaping equipment according to claim 1, characterized in that, The first shaping component (321) includes a pressing block (3211) and a first driving member (3212) for driving the pressing block (3211) to move in a vertical direction. The second shaping component (322) includes a first pushing block (3221) and a second driving member (3222) for driving the first pushing block (3221) to move in a horizontal direction.

3. The protective plate bending and shaping equipment according to claim 2, characterized in that, Pressure sensors (4) are provided on both the lowering block (3211) and the first pushing block (3221).

4. The protective plate bending and shaping equipment according to claim 1, characterized in that, The shaping mechanism (3) further includes a pre-shaping unit (33) disposed on one side of the support unit (31). The pre-shaping unit (33) is used for pre-shaping the protective plate. The pre-shaping unit (33) includes a second push block (331) and a second drive assembly (332) for driving the second push block (331) to move in the horizontal direction.

5. The protective plate bending and shaping equipment according to claim 1, characterized in that, The support unit (31) includes a shaping support block (311) and a third drive assembly (312) for driving the shaping support block (311) to move in the vertical direction.

6. The protective plate bending and shaping equipment according to claim 1, characterized in that, The bending mechanism (2) includes a bending unit (21) and a limiting unit (22). The bending unit (21) is located on one side of the conveying mechanism (1), and the limiting unit (22) is located above the conveying mechanism (1). The bending unit (21) includes a bending support block (211), a bending clamping assembly (212), a fourth drive assembly (213), and a fifth drive assembly (214). The bending support block (211) and the bending clamping assembly (212) are both connected to the drive end of the fourth drive assembly (213). The drive end of the fifth drive assembly (214) is connected to the fixed end of the fourth drive assembly (213). The fifth drive assembly (214) is used to drive the bending support block (211) and the bending clamping assembly (212) to move closer to or further away from the conveying mechanism (1). The fourth drive assembly (213) is used to drive the bending support block (211) and the bending clamping assembly (212) to rotate. The limiting unit (22) is used to limit the clamping action of the bending clamping assembly (212).

7. The protective plate bending and shaping equipment according to claim 6, characterized in that, The bending clamping assembly (212) includes a clamping block (2121), a third driving member (2122) for driving the clamping block (2121) to move in a direction parallel to the bending support block (211), and a fourth driving member (2123) for driving the clamping block (2121) to move in a direction perpendicular to the bending support block (211).

8. The protective plate bending and shaping equipment according to claim 6, characterized in that, The bending support block (211) has an adsorption element (2111) on its end face that contacts the protective plate.

9. The protective plate bending and shaping equipment according to claim 6, characterized in that, The limiting unit (22) includes a limiting block (221) and a sixth driving component (222) for driving the limiting block (221) to move in the vertical direction.

10. The protective plate bending and shaping equipment according to claim 1, characterized in that, The conveying mechanism (1) includes a drive unit (11), a guide rail (12) and multiple carrier trolleys (13). The carrier trolleys (13) are slidably connected to the guide rail (12). The drive unit (11) is used to drive the carrier trolleys (13) to move horizontally along the guide rail (12).

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