Guide rail introduction device and elevator guide rail processing apparatus

Abstract

This utility model provides a guide rail guiding device and an elevator guide rail processing equipment. The guide rail guiding device includes: a guide rail temporary storage conveyor line, a feeding conveyor line, and a turning mechanism. A blocking and positioning mechanism is provided on the guide rail temporary storage conveyor line. The feeding conveyor line is located on one side of the guide rail temporary storage conveyor line. The turning mechanism includes multiple robotic arms and a turning drive assembly. The robotic arms are rotatably positioned on the side of the feeding conveyor line away from the guide rail temporary storage conveyor line, and the ends of the robotic arms extend to the guide rail temporary storage conveyor line. The robotic arms can rotate to the receiving position and the turning position under the drive of the turning drive assembly. Compared with the prior art, the guide rail guiding device of this utility model, after hoisting a row of guide rails onto the guide rail buffer conveyor line, can automatically turn the guide rails from the guide rail buffer conveyor line to the feeding conveyor line in sequence through the turning mechanism, eliminating the need for manual lifting of the guide rails one by one, saving manpower and resources, and is simple to operate.

Description

Technical Field

[0001] This utility model relates to the field of elevator technology, specifically to a guide rail guiding device and elevator guide rail processing equipment. Background Technology

[0002] Elevator guide rails are elevator components mainly composed of steel rails and connecting plates. They are divided into car guide rails and counterweight guide rails, and are classified by cross-sectional shape into T-shaped, L-shaped, and hollow forms. While serving a guiding function, the guide rails also bear the impact forces during car and elevator braking, as well as the impact forces during emergency braking of the safety brakes.

[0003] The process of processing elevator guide rails usually involves the transfer of elevator guide rails between different processing equipment. In the current transfer process, the guide rails are usually stored on the first temporary storage rack. After a certain number are stacked on the first temporary storage rack, workers use a crane to transfer a row of guide rails to the second temporary storage rack. Then, the guide rails are manually lifted one by one onto the feeding conveyor line of the subsequent feeding line. This process is labor-intensive for workers, takes a long time, and is time-consuming and labor-intensive. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings and deficiencies in the existing technology and provide a guide rail guiding device and an elevator guide rail processing equipment.

[0005] One embodiment of this utility model provides a guide rail guiding device, including: a guide rail temporary storage conveyor line, a feeding conveyor line, and a turning mechanism;

[0006] The guide rail temporary storage and conveying line is equipped with a blocking and positioning mechanism;

[0007] The feeding conveyor line is located on one side of the guide rail temporary storage conveyor line;

[0008] The material turning mechanism is disposed between the guide rail temporary storage conveyor line and the feeding conveyor line. The material turning mechanism includes multiple robotic arms and a flipping drive assembly. The robotic arms are rotatably disposed on the side of the feeding conveyor line away from the guide rail temporary storage conveyor line. The end of the robotic arm extends to the guide rail temporary storage conveyor line. The flipping drive assembly is disposed on the feeding conveyor line.

[0009] The robotic arm can rotate to the receiving position and the flipping position under the drive of the flipping drive assembly. When the robotic arm is in the receiving position, the top of the robotic arm is not higher than the top conveying surface of the guide rail temporary storage conveyor line and the top of the robotic arm is not higher than the top conveying surface of the feeding conveyor line. The end of the robotic arm is behind the blocking positioning mechanism in the conveying direction of the guide rail temporary storage conveyor line. When the robotic arm is in the flipping position, the end of the robotic arm is higher than the top conveying surface of the guide rail temporary storage conveyor line. The robotic arm extends downward at an angle from the guide rail temporary storage conveyor line and the feeding conveyor line.

[0010] In some alternative embodiments, a stop structure is provided on the side of the feeding conveyor away from the guide rail temporary storage conveyor.

[0011] In some alternative embodiments, the blocking positioning mechanism includes a plurality of blocking blocks arranged sequentially in a direction perpendicular to the conveying direction of the guide rail temporary storage conveyor line.

[0012] In some alternative embodiments, the blocking block is provided with an adjustable positioning member, which is movable relative to the blocking block and can move relative to the blocking block in the conveying direction of the guide rail temporary storage conveyor line. The adjustable positioning member is formed with a positioning part, which is located behind the blocking block in the conveying direction of the guide rail temporary storage conveyor line.

[0013] In some alternative embodiments, the adjustable positioning element is a bolt, and the positioning portion is formed at the end of the bolt.

[0014] In some alternative embodiments, a first detection component is provided on the guide rail temporary storage conveyor line. The first detection component is signal-connected to the guide rail temporary storage conveyor line and is located on the side of the blocking block away from the feeding conveyor line.

[0015] In some alternative embodiments, the guide rail temporary storage conveyor line includes a chain conveyor mechanism, a buffer rack, and a plurality of first adjustable height feet, wherein the chain conveyor mechanism is disposed on the buffer rack, and the plurality of first adjustable height feet are disposed at the bottom of the buffer rack.

[0016] In some alternative embodiments, the feeding conveyor line includes a feeding frame, a feeding conveying mechanism, and a plurality of second adjustable height feet, the feeding conveying mechanism being disposed on the feeding frame, and the plurality of second adjustable height feet being disposed at the bottom of the feeding frame.

[0017] In some optional embodiments, a second detection component is provided on the feeding frame. The second detection component is signal-connected to the feeding conveying mechanism and is used to detect whether a guide rail exists on the feeding conveying mechanism.

[0018] Another embodiment of this utility model provides an elevator guide rail processing equipment, including: a guide rail guiding device as described above.

[0019] Compared with the existing technology, the guide rail guiding device of this utility model can automatically flip the guide rails from the guide rail buffer conveyor line to the feeding conveyor line in sequence through the flipping mechanism after a row of guide rails is hoisted onto the guide rail buffer conveyor line. This eliminates the need for manual lifting of the guide rails in sequence, saving manpower and resources, and is also simple to operate.

[0020] To provide a clearer understanding of this invention, the specific embodiments of this invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the guide rail guiding device according to an embodiment of the present invention when the robotic arm is in the material receiving position;

[0022] Figure 2 This is a schematic diagram of the guide rail guiding device according to an embodiment of the present invention when the robotic arm is in the material turning position;

[0023] Figure 3 This is a schematic diagram of one side of the feeding conveyor line and the turning mechanism according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the other side of the feeding conveyor line and the turning mechanism according to one embodiment of the present invention;

[0025] Figure 5 This is a cross-sectional view of a partial structure of a guide rail temporary storage and conveying line according to an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10. Guide rail temporary storage conveyor line; 11. Blocking and positioning mechanism; 111. Blocking block; 112. Adjustable positioning component; 113. Positioning part; 12. Chain conveyor mechanism; 13. Buffer frame; 14. First adjustable height foot; 20. Feeding conveyor line; 21. Stop structure; 211. Clearance groove; 22. Feeding frame; 23. Feeding conveyor mechanism; 24. Second adjustable height foot; 25. Second detection component; 30. Turning mechanism; 31. Robotic arm; 32. Turning drive component. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. In the description of the present utility model, unless otherwise stated, "a plurality of" means two or more, and "a number" means one or more. In addition, unless otherwise stated, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. 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.

[0030] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" 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 based on the specific circumstances.

[0031] In the description of this utility model, references to terms such as "one embodiment," "some alternative implementations," or "some optional embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0032] Please see Figures 1 to 4 One embodiment of this utility model provides a guide rail guiding device, including: a guide rail temporary storage conveyor line 10, a feeding conveyor line 20, and a turning mechanism 30.

[0033] A blocking and positioning mechanism 11 is provided on the guide rail temporary storage conveyor line 10;

[0034] The feeding conveyor line 20 is located on one side of the guide rail temporary storage conveyor line 10;

[0035] The material turning mechanism 30 is located between the guide rail temporary storage conveyor line 10 and the feeding conveyor line 20. The material turning mechanism 30 includes multiple robotic arms 31 and a flipping drive assembly 32. The robotic arms 31 are rotatably located on the side of the feeding conveyor line 20 away from the guide rail temporary storage conveyor line 10. The end of the robotic arm 31 extends to the guide rail temporary storage conveyor line 10. The flipping drive assembly 32 is located on the feeding conveyor line 20.

[0036] The robotic arm 31 can rotate to the receiving position and the flipping position under the drive of the flipping drive assembly 32. When the robotic arm 31 is in the receiving position, the top of the robotic arm 31 is not higher than the top conveying surface of the guide rail temporary storage conveyor line 10 and the top conveying surface of the feeding conveyor line 20. The end of the robotic arm 31 is behind the blocking positioning mechanism 11 in the conveying direction of the guide rail temporary storage conveyor line 10. When the robotic arm 31 is in the flipping position, the end of the robotic arm 31 is higher than the top conveying surface of the guide rail temporary storage conveyor line 10. The robotic arm 31 extends downward at an angle from the guide rail temporary storage conveyor line 10 and the feeding conveyor line 20.

[0037] The working principle of the guide rail guiding device according to one embodiment of the present invention is explained below:

[0038] A row of guide rails is lifted onto the guide rail buffer conveyor line by a crane. These guide rails are arranged sequentially along the line. At this point, the robotic arm 31 is in the receiving position. The guide rail buffer conveyor line then transports the guide rails until the foremost guide rail reaches the side of the blocking positioning mechanism 11 away from the feeding conveyor line 20. Next, driven by the flipping drive assembly 32, the robotic arm 31 swings upwards to the flipping position, lifting the foremost guide rail. Since the robotic arm 31 is tilted, the guide rail's own gravity drives it to move along the robotic arm 31 towards... The guide rail rolls onto the feeding conveyor line 20, and then the robotic arm 31 swings downward to the receiving position under the drive of the flipping drive component 32, so that the guide rail is placed on the conveying surface of the feeding conveyor line 20. The guide rail can then be conveyed away by the feeding conveyor line 20. The next guide rail can be conveyed down to the side of the blocking positioning mechanism 11 away from the feeding conveyor line 20 by the guide rail buffer conveyor line. The robotic arm 31 swings upward again to perform the flipping operation of the next guide rail. In this cycle, the guide rails on the guide rail buffer conveyor line can be flipped onto the feeding conveyor line 20 one by one.

[0039] Because the guide rails can be automatically flipped from the guide rail buffer conveyor line to the feeding conveyor line 20 in sequence by the flipping mechanism 30, there is no need for manual lifting of the guide rails in sequence, which saves manpower and material resources, and the operation is simple.

[0040] In some alternative implementations, a stop structure 21 is provided on the side of the feeding conveyor 20 away from the guide rail temporary storage conveyor 10. When the robotic arm 31 is in the material-turning position, the gravity of the guide rail itself drives the guide rail to roll along the robotic arm 31 toward the feeding conveyor 20 until the guide rail abuts against the stop structure 21. This can prevent the guide rail from moving excessively and rolling out of the feeding conveyor 20.

[0041] In order to prevent the stop structure 21 from hindering the rotation of the robotic arm 31, a clearance groove 211 is also provided on the stop structure 21, and part of the robotic arm 31 is located in the clearance groove 211.

[0042] Please see Figure 5 In some optional embodiments, the blocking positioning mechanism 11 includes a plurality of blocking blocks 111, which are arranged sequentially in a direction perpendicular to the conveying direction of the guide rail temporary storage conveyor line 10. The plurality of blocking blocks 111 can prevent the guide rail from tilting relative to the conveying direction of the guide rail temporary storage conveyor line 10. In this embodiment, the blocking positioning mechanism 11 includes two blocking blocks 111. Based on the principle that two points determine a line, the two blocking blocks 111 can prevent the guide rail from tilting relative to the conveying direction of the guide rail temporary storage conveyor line 10.

[0043] Since the dimensions of the guide rails may vary, and in order to ensure that guide rails of different sizes can be positioned at the same location so that the robotic arm 31 can accurately lift the guide rails, in some optional embodiments, an adjustable positioning member 112 is provided on the blocking block 111. The adjustable positioning member 112 is movable relative to the blocking block 111 and can move relative to the blocking block 111 in the conveying direction of the guide rail temporary storage conveyor line 10. A positioning part 113 is formed on the adjustable positioning member 112, and the positioning part 113 is positioned relative to the blocking block 111 in the conveying direction of the guide rail temporary storage conveyor line 10. Behind 1, the position of the adjustable positioning member 112 is adjusted based on the size of the guide rail, thereby adjusting the position of the positioning part 113. After the guide rail is conveyed by the guide rail temporary storage conveyor line 10, it abuts against the positioning part 113. If the guide rail size is relatively large, the adjustable positioning member 112 adjusts its position along the conveying direction of the guide rail temporary storage conveyor line 10, so that the positioning part 113 is close to the blocking block 111. If the guide rail size is relatively small, the adjustable positioning member 112 adjusts its position along the conveying direction of the guide rail temporary storage conveyor line 10, so that the positioning part 113 is away from the blocking block 111.

[0044] In some alternative embodiments, the adjustable positioning member 112 is a bolt, and the positioning part 113 is formed at the end of the bolt. By rotating the bolt, the bolt can be moved relative to the blocking block 111, thereby adjusting the position of the positioning part 113, which is convenient to operate. Of course, the structure of the adjustable positioning member 112 is not limited to this, and those skilled in the art can choose other suitable structures based on the teachings of this utility model.

[0045] In some optional embodiments, a first detection component (not shown) is provided on the guide rail temporary storage conveyor line 10. The first detection component is signal-connected to the guide rail temporary storage conveyor line 10 and is located on the side of the blocking block 111 away from the feed conveyor line 20. When the guide rail is about to abut against the blocking block 111, the guide rail will trigger the first detection component. At this time, the first detection component sends a signal to the guide rail temporary storage conveyor line 10, and the guide rail temporary storage conveyor line 10 stops conveying the guide rail, thereby preventing the guide rail from being squeezed by the guide rail behind it, and preventing the guide rail behind it from being lifted by the robotic arm 31 because it is too close to the guide rail ahead. When the guide rail temporary storage conveyor line 10 stops conveying, the guide rail ahead may abut against the positioning part 113 or may not abut against the positioning part 113. The positioning part 113 can play a limit-limiting role at this time to prevent the guide rail from falling off the guide rail temporary storage conveyor line 10.

[0046] The first detection component can be connected to the guide rail temporary storage conveyor line 10 via wired or wireless means. The specific structure of the first detection component can be selected according to actual needs. For example, the first detection component can be a proximity switch, photoelectric sensor, infrared sensor, etc. The first detection component can be set at a position lower than the top conveying surface of the guide rail temporary storage conveyor line 10, or it can be set above the guide rail temporary storage conveyor line 10. For example, in this embodiment, the first detection component is a metal induction switch. The metal induction switch is set at a position lower than the top conveying surface of the guide rail temporary storage conveyor line 10 and faces upward. When the guide rail passes the metal induction switch, it will trigger the metal induction switch and send a signal to the guide rail temporary storage conveyor line 10. The guide rail temporary storage conveyor line 10 stops conveying the guide rail, so that the guide rail stops near the positioning part 113 or abuts against the positioning part 113.

[0047] In some optional embodiments, the guide rail temporary storage conveyor line 10 includes a chain conveyor mechanism 12, a buffer frame 13, and a plurality of first adjustable height feet 14. The chain conveyor mechanism 12 is mounted on the buffer frame 13, and the plurality of first adjustable height feet 14 are located at the bottom of the buffer frame 13. The first adjustable height feet 14 can adjust the height of the buffer frame 13, thereby adaptively adjusting the height of the chain conveyor mechanism 12 relative to other equipment, so that the height of the chain conveyor mechanism 12 meets the requirements. In this embodiment, the first detection component is signal-connected to the chain conveyor mechanism 12, and the blocking positioning mechanism 11 is mounted on the buffer frame 13.

[0048] The specific structure of the first adjustable height foot 14 can be selected according to actual needs. For example, the first adjustable height foot 14 includes a support plate and a plurality of first adjusting bolts. The first adjusting bolts are rotatably mounted on the support plate and are threadedly engaged with the buffer frame 13. This example is not limited to this one.

[0049] In some alternative embodiments, the feeding conveyor line 20 includes a feeding frame 22, a feeding conveying mechanism 23, and a plurality of second adjustable height feet 24. The feeding conveying mechanism 23 is mounted on the feeding frame 22, and the plurality of second adjustable height feet 24 are mounted at the bottom of the feeding frame 22. The height of the feeding frame 22 is adjusted by the second adjustable height feet 24, thereby adaptively adjusting the height of the chain conveying mechanism 12 relative to other equipment and structures, so that the height of the feeding conveying mechanism 23 meets the requirements.

[0050] In this embodiment, the flipping drive assembly 32 is mounted on the feeding frame 22, and the robotic arm 31 is rotatably mounted on the feeding frame 22. When the robotic arm 31 is in the receiving position, the top of the robotic arm 31 is lower than the top conveying surface of the feeding conveying mechanism 23 and the top conveying surface of the chain conveying mechanism 12.

[0051] The specific structure of the flip drive assembly 32 can be selected according to actual needs. For example, the flip drive assembly 32 can be a cylinder, an electric cylinder, or a hydraulic cylinder. In this embodiment, the flip drive assembly 32 uses multiple cylinders, and the output shafts of the multiple cylinders are connected to multiple robotic arms 31 for driving. Of course, the flip drive assembly 32 can also be a motor, which directly drives the robotic arms 31 to rotate.

[0052] The specific structure of the second adjustable height foot 24 can be selected according to actual needs. For example, the second adjustable height foot 24 includes a support plate and multiple second adjusting bolts. The second adjusting bolts are rotatably mounted on the support plate and are threadedly engaged with the buffer frame 13. This example is not limited to this one.

[0053] The specific structure of the feeding conveyor 23 can be selected according to actual needs. For example, the feeding conveyor 23 can adopt a mesh belt conveyor, a roller conveyor, or a chain plate conveyor, etc., without limitation.

[0054] In some optional embodiments, a second detection component 25 is provided on the feeding frame 22. The second detection component 25 is signal-connected to the feeding conveyor mechanism 23 and is used to detect whether a guide rail is present on the feeding conveyor mechanism 23. After the guide rail rolls down along the robotic arm 31 onto the feeding conveyor mechanism 23, the robotic arm 31 swings down to the receiving position, causing the guide rail to fall onto the feeding conveyor mechanism 23. At this time, the guide rail will trigger the second detection component 25, which sends a signal to the feeding conveyor mechanism 23, and the feeding conveyor mechanism 23 will then start to transport the guide rail.

[0055] The second detection component 25 can be connected to the feeding conveyor mechanism 23 via wired or wireless means. The specific structure of the second detection component 25 can be selected according to actual needs. For example, the second detection component 25 can be a proximity switch, photoelectric sensor, infrared sensor, mechanical switch, etc. For example, in this embodiment, the second detection component 25 adopts a mechanical switch. The mechanical switch can be set on the feeding frame 22 and facing upward. When the guide rail falls on the feeding conveyor mechanism 23, it will press against and trigger the mechanical switch. The mechanical switch sends a signal to the feeding conveyor mechanism 23, and the feeding conveyor mechanism 23 will then transport the guide rail away.

[0056] The aforementioned guide rail guiding device can be applied to elevator guide rail processing equipment, which includes: a guide rail guiding device as described above.

[0057] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A guide rail guiding device, characterized in that, include: Guide rail temporary storage conveyor line, feeding conveyor line and material turning mechanism; The guide rail temporary storage and conveying line is equipped with a blocking and positioning mechanism; The feeding conveyor line is located on one side of the guide rail temporary storage conveyor line; The material turning mechanism is disposed between the guide rail temporary storage conveyor line and the feeding conveyor line. The material turning mechanism includes multiple robotic arms and a flipping drive assembly. The robotic arms are rotatably disposed on the side of the feeding conveyor line away from the guide rail temporary storage conveyor line. The end of the robotic arm extends to the guide rail temporary storage conveyor line. The flipping drive assembly is disposed on the feeding conveyor line. The robotic arm can rotate to the receiving position and the flipping position under the drive of the flipping drive assembly. When the robotic arm is in the receiving position, the top of the robotic arm is not higher than the top conveying surface of the guide rail temporary storage conveyor line and the top of the robotic arm is not higher than the top conveying surface of the feeding conveyor line. The end of the robotic arm is behind the blocking positioning mechanism in the conveying direction of the guide rail temporary storage conveyor line. When the robotic arm is in the flipping position, the end of the robotic arm is higher than the top conveying surface of the guide rail temporary storage conveyor line. The robotic arm extends downward at an angle from the guide rail temporary storage conveyor line and the feeding conveyor line.

2. The guide rail guiding device according to claim 1, characterized in that: A stop structure is provided on the side of the feeding conveyor line away from the guide rail temporary storage conveyor line.

3. The guide rail guiding device according to claim 1, characterized in that: The blocking and positioning mechanism includes multiple blocking blocks, which are arranged sequentially in a direction perpendicular to the conveying direction of the guide rail temporary storage conveyor line.

4. The guide rail guiding device according to claim 3, characterized in that: An adjustable positioning component is provided on the blocking block. The adjustable positioning component is movable with the blocking block and can move relative to the blocking block in the conveying direction of the guide rail temporary storage conveyor line. A positioning part is formed on the adjustable positioning component, and the positioning part is located behind the blocking block in the conveying direction of the guide rail temporary storage conveyor line.

5. The guide rail guiding device according to claim 4, characterized in that: The adjustable positioning element is a bolt, and the positioning part is formed at the end of the bolt.

6. The guide rail guiding device according to claim 3, characterized in that: A first detection component is provided on the guide rail temporary storage conveyor line. The first detection component is signal-connected to the guide rail temporary storage conveyor line and is located on the side of the blocking block away from the feeding conveyor line.

7. A guide rail guiding device according to any one of claims 1 to 6, characterized in that: The guide rail temporary storage conveyor line includes a chain conveyor mechanism, a buffer frame, and multiple first adjustable height feet. The chain conveyor mechanism is mounted on the buffer frame, and the multiple first adjustable height feet are mounted at the bottom of the buffer frame.

8. A guide rail guiding device according to any one of claims 1 to 6, characterized in that: The feeding conveyor line includes a feeding frame, a feeding conveying mechanism, and a plurality of second adjustable height feet. The feeding conveying mechanism is mounted on the feeding frame, and the plurality of second adjustable height feet are mounted at the bottom of the feeding frame.

9. A guide rail guiding device according to claim 8, characterized in that: The feeding frame is equipped with a second detection component, which is signal-connected to the feeding conveying mechanism. The second detection component is used to detect whether there is a guide rail on the feeding conveying mechanism.

10. Elevator guide rail processing equipment, characterized in that, include: A guide rail guiding device as described in any one of claims 1 to 9.

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