Boiler fuel conveying mechanism

Abstract

The utility model provides a boiler fuel conveying mechanism, which belongs to the technical field of boiler fuel conveying and comprises a base station arranged on the front side of a boiler mouth, wheels at the bottom of a feeding trolley are slidably arranged on a feeding track through caulking grooves formed in the circumferential direction, the wheels move along the feeding track, and the wheels are driven by the caulking grooves corresponding to the feeding track to move along the feeding track. Due to the fact that fuel of the boiler is usually conveyed on a large scale, the safety of the fuel conveying process is guaranteed, the tail end of each feeding rail is provided with a feeding table opposite to a feeding port of the boiler, and a driving component used for driving the feeding trolley to move is arranged between the two feeding rails. After the feeding trolley moves to the feeding table, straw fuel on the feeding trolley is fed into the boiler from the boiler feeding port through the material pushing piece, the feeding trolley conveys the fuel continuously through the driving component located between the two feeding rails, and therefore the efficiency of the boiler fuel conveying process is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler fuel transportation, in particular to a boiler fuel transportation mechanism. Background Art

[0002] A boiler is an energy conversion device. Energy inputs include chemical energy from fuel and electrical energy, and the boiler outputs steam, high-temperature water, or an organic heat carrier with a certain amount of thermal energy. The original meaning of "pot" refers to a container for water heated over a fire, while "furnace" refers to the place where fuel is burned. A boiler consists of two main parts: the pot and the furnace. The hot water or steam produced by the boiler can directly provide heat energy for industrial production and daily life. It can also be converted into mechanical energy through a steam power plant, or further converted into electrical energy through a generator. Boilers require fuel to maintain the combustion temperature. Because boilers require large amounts of fuel, large quantities of fuel, such as bundles of straw, are transported each time.

[0003] Related technology (publication number: CN221542993U) discloses a straw fuel conveying device for biomass power generation. The disclosed technical solution is: through structural improvement, a rotating discharge pipe is used to evenly disperse the straw in the boiler, so that the straw will not accumulate on one side, the overall combustion is more complete, the use of motors is reduced, and the overall reliability is improved.

[0004] In the above-mentioned disclosed technical solutions, the following problems were found in the relevant technologies: during the boiler loading process, a large amount of boiler fuel, i.e. straw, needs to be transported, and the boiler feed port is usually located at a high place, which makes feeding extremely inconvenient. Once the fuel falls during the transportation process, the efficiency of boiler feeding is affected. Therefore, we have proposed a new boiler fuel delivery mechanism.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background technology section of this application, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Utility Model Content

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art or related art. In order to solve the problem of boiler fuel transportation in the above-mentioned prior art, the present invention provides a boiler fuel delivery mechanism that uses a feeding structure combined with a feeding positioning structure to achieve accurate feeding. The specific technical solution is as follows:

[0007] A boiler fuel conveying mechanism includes a base arranged on the front side of the boiler furnace mouth, a feeding track is laid on the base in a slope, a feeding trolley is slidably arranged on the feeding track, and the wheels at the bottom of the feeding trolley are slidably arranged on the feeding track through circumferentially opened grooves, and a loading platform opposite to the boiler feed port is provided at the end of the feeding track, a driving component for driving the feeding trolley to move is provided between the two feeding tracks, and a sensor module for starting and stopping the feeding trolley is provided on the top of the loading platform.

[0008] In the above technical solution, the sensor module includes a position sensor arranged on the top of the loading platform and a weight sensor embedded in the base of the feeding vehicle, and the position sensor and the weight sensor are electrically connected to the driving component respectively.

[0009] The driving component includes a chain connected to the bottom of the feeding car, and sprockets are rotatably provided at the starting end of the feeding track and the top of the loading platform. The chain is sleeved on the outside of the two sprockets, and a driving member for driving the sprockets to rotate is provided on the top of the loading platform.

[0010] Baffles are symmetrically arranged on the top of the feeding vehicle.

[0011] The top of the loading platform is provided with a positioning component for locking the feeding trolley, and the bottom of the feeding trolley is provided with an unlocking component opposite to the positioning component.

[0012] The positioning assembly includes a support column fixed to the top of the loading platform, a clamping column is embedded in the top of the support column, the wheel is set at the bottom of the feeding car through the frame, a clamping seat corresponding to the clamping column is set on the side wall of the frame, and an elastic member is set between the bottom of the inner wall of the support column and the clamping column.

[0013] The top end of the clamping column is provided with a spherical clamping end.

[0014] The bottom of the clamping seat close to the loading platform is provided with an arc-shaped inclined surface.

[0015] The unlocking assembly includes an electric telescopic member arranged on the frame, and the electric telescopic member is arranged opposite to the card hole of the card seat, and the movable end of the electric telescopic member is provided with an unlocking plug-in corresponding to the card hole of the card seat.

[0016] The outer sides of the two feeding tracks are both provided with anti-deflection guide rails, and the side walls of the frame are provided with limiting clamps that fit on the inner walls of the anti-deflection guide rails.

[0017] Compared with the prior art, the beneficial effects of the present invention are: the boiler fuel delivery mechanism:

[0018] 1. When driving the feeder to transport fuel, connect the drive unit to the power supply, so that the drive unit drives the corresponding sprocket to rotate through the reducer, and the other sprocket rotates through the chain, so that the feeder moves along with the chain after loading the fuel. This brings convenience to the boiler fuel transportation process.

[0019] Second, the wheels move along the feeding track, and the corresponding grooves on the feeding track prevent the feeding car from deviating from the feeding track. Since the fuel for the boiler is usually transported in large batches, that is, the bundled straw transported each time is 1000kg to 3000kg, plus the weight of the feeding car itself, the wheels will not deviate from the feeding track, thereby ensuring the stability of the fuel transportation process and further ensuring the safety of the fuel transportation process.

[0020] 3. Two arc-shaped baffles are symmetrically fixed on the top of the feeding car and close to the edges on both sides. The curvature of the baffles corresponds to the pushing piece pushed into the boiler. The baffles on both sides prevent the fuel from falling during transportation.

[0021] Fourth, the position of the feeding trolley is locked by the positioning component to prevent the position of the feeding trolley from shifting during the process of pushing the material into the boiler, thereby ensuring the stability of the boiler loading process.

[0022] 5. When the feeding trolley needs to return to retrieve the materials after feeding, the movable end of the electric telescopic part drives the unlocking plug-in to slide in the card hole, so that the unlocking plug-in pushes the card post out of the card seat, thereby unlocking the feeding trolley. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural diagram of a boiler fuel delivery mechanism of the utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the loading platform and feeding car of the utility model Figure 1 ;

[0025] Figure 3 This is a schematic diagram of the structure of the loading platform and feeding car of the utility model Figure 2 ;

[0026] Figure 4 This is a partial structural diagram of the feeding vehicle of the present utility model;

[0027] Figure 5 This is a structural cross-sectional view of the positioning component part of the utility model;

[0028] in, Figures 1 to 5The correspondence between the figure marks and the component names is: 1-feeding cart, 2-feeding track, 3-loading platform, 4-chain, 5-limiting clamp, 6-anti-deflection guide rail, 7-wheel, 8-sprocket, 9-frame, 10-feeding port, 11-fixed frame, 12-baffle, 13-reducer, 14-driving part, 15-connecting part, 16-base, 17-electric telescopic part, 18-clamping seat, 19-support column, 20-unlocking plug-in, 21-clamping column, 22-spherical clamping end, 23-elastic part, 24-position sensor, 25-weight sensor. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] The following is a combination of specific implementation cases and attached Figure 1-5 The present invention will be further described below, but the present invention is not limited to these embodiments.

[0031] A boiler fuel delivery mechanism includes a base 16 disposed in front of the boiler furnace. A feed track 2 is laid on the base 16 at a slope. A feed trolley 1 is slidably mounted on the feed track 2. The feed track 2 is laid on the base 16 at a slope. When the base 16 is constructed, since loading is required at a low point, a slope of 10° to 30° is created between the base 16 and the loading platform 3, ensuring the convenience of the fuel transportation process. Two feed tracks 2 are laid from low to high in front of the boiler. After the bundled straw fuel is placed on the feed trolley 1 at a low point, it is moved to the boiler loading platform 3 via the feed tracks 2. On the loading platform 3, the straw fuel on the feed trolley 1 is pushed into the boiler by a pusher. A sensor module for starting and stopping the feed trolley 1 is installed on the top of the loading platform 3. The sensor module controls the start and stop of the driving component, making the position of the feed trolley 1 for picking up and feeding the material more accurate.

[0032] The bottom of the feeder trolley 1 is equipped with wheels 7, which slide onto the feeder track 2 via circumferentially defined slots. Four wheels 7 are mounted on the bottom of the feeder trolley 1, near both side edges. Each wheel 7 has a circumferentially defined slot on its outer wall, with the slotted holes corresponding to the feeder track 2. This allows the wheels 7 to be clipped onto the outside of the feeder track 2, effectively covering the top of the track 2. This allows the wheels 7 to move along the track 2, while the corresponding slots prevent the feeder trolley 1 from deviating from the track 2.

[0033] Since boiler fuel is usually transported in large batches, that is, the bundled straw transported each time is 1000Kg to 3000Kg, plus the weight of the feeding vehicle 1 itself, the wheels 7 will not deviate from the feeding track 2, thereby ensuring the stability of the fuel transportation process and further ensuring the safety of the fuel transportation process.

[0034] The end of the feeding track 2 is provided with a loading platform 3 opposite to the boiler feed port 10. A driving member for driving the feeding vehicle 1 is provided between the two feeding tracks 2. The end of the feeding track 2 is connected to the loading platform 3, which is supported and fixed by a bracket at the bottom, and is fixed in front of the boiler feed port 10.

[0035] When the feeding car 1 moves to the loading platform 3, the straw fuel on the feeding car 1 is fed into the boiler through the boiler feed port 10 by the pushing member. The driving component located between the two feeding rails 2 enables the feeding car 1 to continuously transport fuel, thereby ensuring the efficiency of the boiler fuel transportation process.

[0036] The sensor module includes a position sensor 24 arranged on the top of the loading platform 3 and a weight sensor 25 embedded in the base of the feeding vehicle 1. The position sensor 24 and the weight sensor 25 are electrically connected to the driving component respectively.

[0037] Through the position sensor 24 located on the top of the loading platform 3, when the feeding cart 1 moves to the sensing position of the position sensor 24, the feeding cart 1 stops moving at this time, and the feeding cart 1 is opposite to the feed port 10 of the boiler.

[0038] As the fuel is pushed into the boiler, the weight of the fuel decreases. When the weight sensor 25 on the base of the feeder trolley 1 reaches a preset value, the weight sensor 25 transmits a signal to the drive component, causing the feeder trolley 2 to return to retrieve the fuel, thus ensuring the stability of the boiler fuel transportation process.

[0039] The drive assembly includes a chain 4 connected to the bottom of the feeder trolley 1. A connector 15 is fixedly mounted on the bottom of the feeder trolley 1, located between the two wheels 7. Specifically, two connectors 15 are mounted on the bottom of the feeder trolley 1, located in a straight line. The two connectors 15 are fixed to the front and rear sides of the feeder trolley 1. The two connectors 15 are connected to corresponding outer link plates on the chain 4. As the chain moves, it drives the feeder trolley 1 via the outer link plates at the corresponding positions.

[0040] Sprockets 8 are rotatably mounted at the starting ends of the feed tracks 2 and on top of the loading platform 3. A mounting bracket is fixed to the ground between the starting ends of the two feed tracks 2. Bearings are embedded in the inner walls of both sides of the bracket. The ends of the central shaft are respectively embedded in the insides of the two bearings. One of the sprockets 8 is fixedly mounted on the outside of the central shaft through a mounting hole opened in the center. A drive member 14 is fixed to the loading platform 3 via a frame.

[0041] Chain 4 is mounted on the outside of two sprockets 8. A driver 14 is installed on top of the loading platform 3 to drive the sprockets 8. Driver 14 is a motor, electrically connected to an external power source via wires. Driver 14 is connected to the input shaft of a reducer 13, which is fixed to the top of the loading platform 3 via a frame. The other sprocket 8 is fixedly mounted on the outside of the output shaft of the reducer 13 through a central mounting hole. The chain 4 corresponding to the feed track 2 is mounted on the outside of both sprockets 8. That is, the two sprockets 8 mesh with the chain 4 at the beginning and end of the feed track 2, respectively.

[0042] When driving the feeder 1 to transport fuel, the driving member 14 is connected to a power source, so that the driving member 14 drives the corresponding sprocket 8 to rotate through the reducer 13, and the other sprocket 8 rotates through the chain 4, so that the feeder 1 is loaded with fuel and moves along with the chain 4. This brings convenience to the boiler fuel transportation process.

[0043] Among them, baffles 12 are symmetrically provided on the top of the feeding cart 1. Two arc-shaped baffles 12 are symmetrically fixed on the top of the feeding cart 1 and near the edges on both sides. The curvature of the baffles 12 corresponds to the pushing piece pushed into the boiler, and the baffles 12 on both sides prevent the fuel from falling during transportation.

[0044] The top of the loading platform 3 is equipped with a positioning assembly for locking the feeder trolley 1, and the bottom of the feeder trolley 1 is equipped with an unlocking assembly opposite the positioning assembly. After the feeder trolley 1 delivers fuel to the loading platform 3, the positioning assembly locks the feeder trolley 1 in place, preventing it from shifting during the process of pushing fuel into the boiler, thereby ensuring the stability of the boiler loading process.

[0045] After the fuel delivery in the boiler is completed, the position of the feeding trolley 1 is unlocked by the unlocking component, and then the feeding trolley 1 is driven by the driving component to take the fuel.

[0046] It's worth noting that the positioning assembly includes support columns 19 fixed to the top of the loading platform 3. A clamping column 21 is embedded in the top of the support column 19. Four support columns 19 are vertically fixed to the top of the loading platform 3, and their positions correspond to the positions of the four wheels 7 of the loading cart 1. The four clamping columns 21 extend through the top of their corresponding support columns 19 and into the inner cavity, forming a telescopic structure with the clamping columns 21 and the clamping columns 19.

[0047] Wheels 7 are mounted on the bottom of the feeder trolley 1 via a frame 9. Attachment seats 18 corresponding to attachment posts 21 are provided on the sidewalls of the frame 9. A fixed mounting frame 9 is provided at the bottom of the feeder trolley 1, corresponding to the feeder track 2. Each wheel 7 rotates within its respective frame 9 via a movable axle. Attachment seats 18 are snugly fixed to the outer wall of the frame 9, located on the inner side. Attachment holes are defined longitudinally on the surface of these attachment seats.

[0048] An elastic member 23 is provided between the bottom of the inner wall of the support column 19 and the clamping column 21 . The elastic member 23 is a compression spring. Two ends of the elastic member 23 are respectively fixed to the bottom of the inner wall of the support column 19 and the bottom of the clamping column 21 .

[0049] When the feeding trolley 1 moves to the loading platform 3, the feeding trolley 1 drives the clamping seat 18 on the frame 9 to slide over the surface of the clamping column 21. At this time, the elastic member 23 is compressed and generates elastic force. When the clamping column 21 slides to the clamping hole position of the clamping seat 18, the elastic force of the elastic member 23 is used to drive the clamping column 21 to move, so that the clamping column 21 is clamped in the clamping hole of the clamping seat 18. The position of the feeding trolley 1 is locked by the plug-in cooperation of the four clamping columns 21 and the clamping seat 18, thereby ensuring the stability of the boiler loading process.

[0050] In addition, the top of the clamping column 21 is provided with a spherical clamping end 22. The hemispherical spherical clamping end 22 is fixed to the top of the clamping seat 21, thereby reducing the friction between the top of the clamping column 21 and the clamping seat 18, thereby making the locking process of the feeding vehicle 1 more streamlined.

[0051] In addition, a curved inclined surface is provided on the bottom of the clamping seat 18 near the loading platform 3. A curved inclined surface is provided between the bottom of the clamping seat 18 near the loading platform 3 and the clamping hole. The curved inclined surface corresponds to the spherical clamping end 22, reducing the friction between the clamping column 21 and the clamping seat 18, thereby ensuring the smoothness of the locking process of the feeding cart 1.

[0052] Furthermore, the unlocking assembly includes an electric telescopic member 17 disposed on the vehicle frame 9, and the electric telescopic member 17 is disposed opposite the latching hole of the mounting base 18. The movable end of the electric telescopic member 17 is provided with an unlocking plug-in 20 corresponding to the latching hole of the mounting base 18. The electric telescopic member 17 is fixedly mounted on the inner side of the vehicle frame 9, perpendicular to the ground. The electric telescopic member 17 can be an electric push rod, and the electric telescopic member 17 is electrically connected to an external power source via a wire. The movable end of the electric telescopic member 17 is vertically fixed to the top of the unlocking plug-in 20. The specifications of the unlocking plug-in 20 correspond to the latching hole of the mounting base 18, so that the unlocking plug-in 20 fits the inner wall of the latching hole and slides.

[0053] When the feeding trolley 1 needs to return to pick up the materials after finishing feeding, the electric telescopic part 17 is connected to the power supply, so that the movable end of the electric telescopic part 17 drives the unlocking plug-in 20 to slide in the card hole, so that the unlocking plug-in 20 pushes the card column 21 out of the card seat 18, thereby unlocking the feeding trolley 1.

[0054] The outer sides of the two feed tracks 2 are each provided with an anti-deflection guide rail 6, and the side walls of the frame 9 are provided with a limit clamp 5 that fits against the inner wall of the anti-deflection guide rail 6. The limit clamp 5 is a spherical body. The anti-deflection rail 6 is laid on both sides of the feed track 2. The anti-deflection rail 6 and the feed track 2 are both fixed to the ground by a fixing frame 11, ensuring the stability of the anti-deflection rail 6 and the loading track 2.

[0055] A spherical limit card 5 is installed between the frame 9 and the anti-deviation track 6. The spherical limit card 5 slides along the inner wall of the anti-deviation guide rail 6 as the frame 9 is attached, thereby preventing the feeding cart 1 from deviating during the movement process, thereby ensuring the stability of the feeding cart 1 during the movement process.

[0056] This embodiment provides a boiler fuel delivery mechanism, and its working principle is as follows: first, the driving member 14 is connected to the power supply, so that the driving member 14 drives the corresponding sprocket 8 to rotate through the reducer 13, and the other sprocket 8 is rotated through the chain 4, so that the feeding car 1 moves along with the chain 4 after being loaded with fuel.

[0057] When the feeder 1 moves onto the loading platform 3, it drives the connecting seat 18 on the frame 9 to slide across the surface of the connecting post 21. This compresses the elastic member 23 and generates an elastic force. When the connecting post 21 slides to the position of the engaging hole of the connecting seat 18, the elastic force of the elastic member 23 drives the connecting post 21 to move, causing it to engage within the engaging hole of the connecting seat 18. The four connecting posts 21 engage the connecting seat 18 to lock the feeder 1 in place. The fuel on the feeder 1 is then pushed into the boiler by the pusher.

[0058] When the feeding trolley 1 needs to return to pick up the materials after finishing feeding, the electric telescopic part 17 is connected to the power supply, so that the movable end of the electric telescopic part 17 drives the unlocking plug-in 20 to slide in the card hole, so that the unlocking plug-in 20 pushes the card column 21 out of the card seat 18, and then drives the feeding trolley 1 to return to pick up the materials through the chain 4.

[0059] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "two ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0060] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one such feature.

[0061] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0062] Although the 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A boiler fuel delivery mechanism, comprising a base (16) arranged at the front side of a boiler furnace, characterized in that: A feeding track (2) is laid on the base (16) in a sloped manner, a feeding trolley (1) is slidably arranged on the feeding track (2), and the wheels (7) at the bottom of the feeding trolley (1) are slidably arranged on the feeding track (2) through circumferentially arranged grooves, and a loading platform (3) opposite to the boiler feed port (10) is arranged at the end of the feeding track (2), and a driving component for driving the feeding trolley (1) to move is arranged between the two feeding tracks (2), and a sensor module for starting and stopping the feeding trolley (1) is arranged on the top of the loading platform (3).

2. A boiler fuel delivery mechanism according to claim 1, characterized in that: The sensor module comprises a position sensor (24) arranged on the top of the loading platform (3) and a weight sensor (25) embedded in the base of the feeding vehicle (1); the position sensor (24) and the weight sensor (25) are respectively electrically connected to the driving component.

3. A boiler fuel delivery mechanism according to claim 1, characterized in that: The driving component includes a chain (4) connected to the bottom of the feeding vehicle (1), a sprocket (8) is rotatably provided at the starting end of the feeding track (2) and the top of the loading platform (3), the chain (4) is sleeved on the outside of the two sprockets (8), and a driving member (14) is provided on the top of the loading platform (3) for driving the sprocket (8) to rotate.

4. A boiler fuel delivery mechanism according to claim 1, characterized in that: Baffles (12) are symmetrically provided on the top of the feeding vehicle (1).

5. The boiler fuel delivery mechanism according to claim 1, characterized in that: The top of the loading platform (3) is provided with a positioning component for locking the feeding trolley (1), and the bottom of the feeding trolley (1) is provided with an unlocking component opposite to the positioning component.

6. A boiler fuel delivery mechanism according to claim 5, characterized in that: The positioning assembly includes a support column (19) fixed to the top of the loading platform (3), a clamping column (21) is embedded in the top of the support column (19), the wheel (7) is set at the bottom of the feeding vehicle (1) through the frame (9), a clamping seat (18) corresponding to the clamping column (21) is set on the side wall of the frame (9), and an elastic member (23) is set between the bottom of the inner wall of the support column (19) and the clamping column (21).

7. A boiler fuel delivery mechanism according to claim 6, characterized in that: The top end of the clamping column (21) is provided with a spherical clamping end (22).

8. A boiler fuel delivery mechanism according to claim 7, characterized in that: The bottom of the clamping seat (18) close to the loading platform (3) is provided with an arc-shaped inclined surface.

9. The boiler fuel delivery mechanism according to claim 6, characterized in that: The unlocking assembly comprises an electric telescopic member (17) arranged on the vehicle frame (9), and the electric telescopic member (17) is arranged relative to the clamping hole of the clamping seat (18), and the movable end of the electric telescopic member (17) is provided with an unlocking plug-in (20) corresponding to the clamping hole of the clamping seat (18).

10. The boiler fuel delivery mechanism according to claim 6, characterized in that: The outer sides of the two feeding tracks (2) are both provided with anti-deflection guide rails (6), and the side walls of the vehicle frame (9) are provided with position limiting clamps (5) that fit on the inner walls of the anti-deflection guide rails (6).

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