Pipe cutting feeding mechanism based on automatic feeding

Abstract

This utility model belongs to the field of pipe fitting feeding technology, and particularly relates to a feeding mechanism for pipe fitting cutting based on automated feeding. It includes a mounting plate, two toothed belts, and a first toothed belt drive plate. The two toothed belts are mounted on the mounting plate, and the first toothed belt drive plate is located within one of the toothed belts. It also includes a limiting groove, which is located within the mounting plate and communicates with the outside. A sliding plate is slidably connected within the limiting groove. A second toothed belt drive plate is fixedly connected to one side of the sliding plate, and the second toothed belt drive plate is located within the cavity of the other toothed belt and is in contact with it. A first sliding groove is provided on the top surface of the sliding plate. This utility model significantly improves the moving speed of the toothed belt drive plate by optimizing its transmission logic and motion efficiency, fundamentally shortening the adjustment time of the distance between the two toothed belts, and ultimately enhancing the overall operating efficiency of the integrated "feeding to cutting" production line, better meeting the actual needs of "efficient production changeover and cost reduction" in industrial production.

Description

Technical Field

[0001] This utility model belongs to the field of pipe feeding technology, and in particular relates to a feeding mechanism for pipe cutting based on automated feeding. Background Technology

[0002] The automatic feeding mechanism for pipe cutting, also known as an automatic pipe feeder, is an automated feeding device designed specifically for the cutting and processing of pipes (such as metal pipes, plastic pipes, copper pipes, stainless steel pipes, etc.). Its core function is to replace manual labor in completing processes such as loading, positioning, conveying, and length setting of pipes. It is used in conjunction with pipe cutting machines (such as laser pipe cutting machines, saw blade pipe cutting machines, plasma pipe cutting machines, etc.) to form an integrated automated processing flow of "feeding to cutting".

[0003] In the actual working conditions of the automatic pipe cutting feeder, the inability to flexibly adjust the distance between the two toothed belts is a key issue restricting the practicality of the equipment. Due to the fixed distance, the equipment is difficult to adapt to pipes of different diameters, wall thicknesses and other specifications, resulting in a narrow range of applications and an inability to meet the production needs of processing multiple types of pipes. It is particularly limited in small-batch, multi-variety production scenarios.

[0004] To overcome this limitation, existing technologies have developed automatic pipe feeding machines equipped with a spacing adjustment mechanism. The adjustment logic is as follows: the toothed belt drive plate drives one toothed belt to move closer to or further away from the other toothed belt, thereby adjusting the spacing between the two toothed belts to adapt to different types of pipe fittings.

[0005] However, the current driving method of the equipment has obvious shortcomings. When driving the toothed belt drive plate, the structure of "rotating threaded rod" is generally adopted. The toothed belt drive plate is moved by the thread transmission of the threaded rod. This adjustment method is limited by the characteristics of thread transmission, resulting in a slow moving speed of the toothed belt drive plate and a long time for spacing adjustment. It is difficult to quickly complete the switching of processing different specifications of pipe fittings, which directly slows down the rhythm of the "feeding to cutting" integrated production line and reduces the overall working efficiency of the equipment. It is incompatible with the requirements of "efficient switching and rapid production" in industrial production. In view of this, we propose a feeding mechanism for pipe fitting cutting based on automated feeding. Utility Model Content

[0006] The purpose of this invention is to provide a feeding mechanism for pipe cutting based on automated feeding, so as to solve the problems mentioned in the background art.

[0007] In view of this, the present invention provides a feeding mechanism for pipe cutting based on automated feeding, including a mounting plate, two toothed belts and a first toothed belt drive plate, wherein the two toothed belts are disposed on the mounting plate, and the first toothed belt drive plate is disposed within one of the toothed belts, and further includes: A limiting groove is formed inside the mounting plate and communicates with the outside. A sliding plate is slidably connected inside the limiting groove. A second toothed belt drive plate is fixedly connected to one side of the sliding plate. The second toothed belt drive plate is located in the inner cavity of another toothed belt and is in contact with the other toothed belt. A first sliding groove is formed on the top surface of the sliding plate. Two first sliders are slidably connected inside the first sliding groove. Two transmission plates are rotatably connected inside the limiting groove. One end of each of the two transmission plates is rotatably connected to the two first sliders respectively. A drive assembly, located on a mounting plate, is used to drive two transmission plates to rotate.

[0008] This technical solution ensures that users can quickly adjust the spacing between the two toothed belts, thereby improving the overall working efficiency of the device.

[0009] In the above technical solution, the driving component further includes: A fixing plate is fixedly connected to one side of a mounting plate. Two gears are rotatably connected to the inner wall of the fixing plate, and the two gears mesh with each other. One end of each gear passes through one side of the mounting plate and extends into a limiting groove, where it is fixedly connected to two transmission plates respectively. The other end of one of the gears is fixedly connected to a rotating rod, and one end of the rotating rod passes through the inner wall of the fixing plate and extends to the outside. A clamping assembly is located between a fixed plate and a rotating rod, and is used to fix the rotating rod.

[0010] In this technical solution, it is ensured that the user can simultaneously drive two transmission plates to rotate rapidly in opposite directions.

[0011] In the above technical solution, one end of each of the two gears is rotatably connected to the limiting groove, one end of each of the two gears is rotatably connected to the mounting plate, and the rotating rod is rotatably connected to the fixing plate.

[0012] In this technical solution, it is ensured that when the two gears rotate, one end of each gear can rotate normally within the limiting groove, and that when the two gears rotate, one end of each gear can rotate normally within the mounting plate. At the same time, it is ensured that when the rotating rod rotates, the rotating rod can rotate normally within the fixed plate.

[0013] In the above technical solution, the clamping component further includes: A clamping sleeve is disposed on the periphery of the rotating rod and is fixedly connected to the fixing plate; The second slide groove is formed inside the rotating rod and communicates with the outside. A second slider is slidably connected inside the second slide groove, and both ends of the second slider extend to the outside. Both ends of the second slider are fixedly connected to a sliding sleeve, which is fitted around the circumference of the rotating rod. A pressing groove is formed at the end of the sliding sleeve near the clamping sleeve. A threaded rod is threadedly connected inside the second slider, and the threaded rod is located inside the second slide groove and rotatably connected to the inner wall of the second slide groove. A rotating block is fixedly connected to one end of the threaded rod, and one end of the rotating block penetrates the inner wall of the second slide groove and extends to the outside, rotatably connected to the rotating rod.

[0014] In this technical solution, it is ensured that the rotating rod will not be affected by external factors and will not rotate.

[0015] In the above technical solution, the rotating rod and the clamping sleeve are rotatably engaged but not connected. The sliding sleeve is slidably connected to the circumference of the rotating rod. One end of the clamping sleeve is inclined. Anti-slip texture is provided on the circumference of the rotating block. The extrusion groove is inserted into one end of the clamping sleeve.

[0016] In this technical solution, it is ensured that when the rotating rod rotates, it can rotate normally within the clamping sleeve without causing the clamping sleeve to rotate. It is also ensured that when the sliding sleeve moves, it can slide normally around the rotating rod. At the same time, it is ensured that when one end of the clamping sleeve is squeezed, that end of the clamping sleeve will retract towards the rotating rod to fix the rotating rod. The anti-slip texture on the rotating block can increase the friction between the rotating block and the hand, reducing the occurrence of hand slippage. In addition, it is ensured that when the sliding sleeve moves to the appropriate position, one end of the clamping sleeve can be inserted into the extrusion groove.

[0017] The beneficial effects of this utility model are: 1. This automated feeding mechanism for pipe cutting utilizes a transmission plate, gears, and a rotating rod. Two transmission plates rotate in opposite directions within a limiting groove. A sliding plate, a second toothed belt drive plate, and a first slider ensure that as the two transmission plates rotate in opposite directions, the sliding plate moves rapidly up and down along the limiting groove, driving the second toothed belt drive plate to move rapidly up and down. This allows the user to adjust the distance between the two toothed belts. This structural design optimizes the transmission logic and motion efficiency of the toothed belt drive plate, significantly improving its movement speed and fundamentally reducing the time required to adjust the distance between the two toothed belts. This enables users to quickly switch between processing pipes of different diameters and wall thicknesses without spending excessive time on equipment debugging. Ultimately, this effectively improves the continuous operation capability of the automatic pipe cutting feeder, enhances the overall operating efficiency of the integrated "feeding to cutting" production line, and better meets the actual needs of "efficient production changeover and cost reduction" in industrial production.

[0018] 2. This automated feeding mechanism for pipe cutting allows the user to move the sliding sleeve via a second slider, sliding sleeve, threaded rod, and rotating block. Through a clamping sleeve and an extrusion groove, the sliding sleeve presses against one end of the clamping sleeve as it moves, clamping the rotating rod and fixing it to the fixed plate. This design ensures the rotating rod is stably fixed within the fixed plate when it reaches the preset position, guaranteeing stable positioning accuracy and preventing displacement or rotation due to external forces (such as equipment vibration or forces from subsequent processes) after reaching the preset position, thus ensuring consistent positioning. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the limiting groove in this utility model; Figure 3 This is a schematic diagram of the regional structure of the skateboard in this utility model; Figure 4 This utility model Figure 1 Enlarged structural diagram at point A in the middle; Figure 5 This is a schematic diagram of the regional structure of the fixing plate in this utility model; Figure 6 This is a schematic diagram of the internal structure of the rotating rod in this utility model.

[0020] The markings in the diagram are as follows: 1. Mounting plate; 2. Toothed belt; 3. First toothed belt drive plate; 4. Limiting groove; 5. Slide plate; 6. Second toothed belt drive plate; 7. First slide groove; 8. First slider; 9. Transmission plate; 10. Fixing plate; 11. Gear; 12. Rotating rod; 13. Clamping sleeve; 14. Second slide groove; 15. Second slider; 16. Sliding sleeve; 17. Extrusion groove; 18. Threaded rod; 19. Rotating block. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0022] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0023] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0024] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" 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 application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0025] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0026] Example 1: Please see Figure 1 - Figure 6 As shown, this embodiment provides a feeding mechanism for pipe cutting based on automated feeding, including a mounting plate 1, two toothed belts 2, and a first toothed belt drive plate 3. The two toothed belts 2 are disposed on the mounting plate 1, and the first toothed belt drive plate 3 is disposed within one of the toothed belts 2. It also includes: The limiting groove 4 is opened in the mounting plate 1 and is connected to the outside. The sliding plate 5 is slidably connected in the limiting groove 4. The second toothed belt drive plate 6 is fixedly connected to one side of the sliding plate 5. The second toothed belt drive plate 6 is located in the inner cavity of another toothed belt 2 and is in contact with the other toothed belt 2. The top surface of the sliding plate 5 is provided with a first sliding groove 7. Two first sliders 8 are slidably connected in the first sliding groove 7. Two transmission plates 9 are rotatably connected in the limiting groove 4, and one end of the two transmission plates 9 is rotatably connected to the two first sliders 8 respectively. The drive assembly is located on the mounting plate 1 and is used to drive the two transmission plates 9 to rotate.

[0027] In operation, the user drives two transmission plates 9 to rotate in opposite directions within the limiting groove 4 via the drive assembly. When the two transmission plates 9 rotate in opposite directions, they respectively drive two first sliders 8 to move closer or further apart along the first slide groove 7. This causes the two first sliders 8 to drive the slide plate 5 to move rapidly downward along the limiting groove 4, which in turn causes the slide plate 5 to drive the second toothed belt drive plate 6 to move rapidly downward. When the second toothed belt drive plate 6 moves rapidly downward, it pushes another toothed belt 2 towards one of the toothed belts 2, ensuring that the user can quickly adjust the gap between the two toothed belts 2 and improve the overall working efficiency of the device.

[0028] Example 2: This embodiment provides a feeding mechanism for pipe cutting based on automated feeding. In addition to the technical solutions of the above embodiments, it also has the following technical features, and the driving component includes: A fixing plate 10 is fixedly connected to one side of the mounting plate 1. Two gears 11 are rotatably connected to the inner wall of the fixing plate 10, and the two gears 11 mesh with each other. One end of the two gears 11 passes through one side of the mounting plate 1 and extends into the limiting groove 4, and is fixedly connected to the two transmission plates 9 respectively. The other end of one of the gears 11 is fixedly connected to a rotating rod 12, and one end of the rotating rod 12 passes through the inner wall of the fixing plate 10 and extends to the outside. A clamping assembly is located between the fixed plate 10 and the rotating rod 12 and is used to fix the rotating rod 12.

[0029] In use, the user manually rotates the rotating rod 12, causing one of the gears 11 to rotate within the cavity of the fixed plate 10. This causes one gear 11 to drive the other gear 11 to rotate in the opposite direction. When the two gears 11 rotate in opposite directions, one end of each gear 11 will drive the two transmission plates 9 to rotate in opposite directions within the limiting groove 4, ensuring that the user can simultaneously drive the two transmission plates 9 to rotate rapidly in opposite directions.

[0030] Example 3: This embodiment provides a feeding mechanism for pipe cutting based on automated feeding. In addition to the technical solution of the above embodiment, it also has the following technical features: one end of the two gears 11 is rotatably connected to the limiting groove 4, one end of the two gears 11 is rotatably connected to the mounting plate 1, and the rotating rod 12 is rotatably connected to the fixing plate 10.

[0031] Specifically, it is ensured that when the two gears 11 rotate, one end of the two gears 11 can rotate normally within the limiting groove 4, and that when the two gears 11 rotate, one end of the two gears 11 can rotate normally within the mounting plate 1. At the same time, it is ensured that when the rotating rod 12 rotates, the rotating rod 12 can rotate normally within the fixed plate 10.

[0032] Example 4: This embodiment provides a feeding mechanism for pipe cutting based on automated feeding. In addition to the technical solutions of the above embodiments, it also has the following technical features: the clamping component includes: The clamping sleeve 13 is disposed on the periphery of the rotating rod 12 and is fixedly connected to the fixing plate 10. The second slide groove 14 is formed inside the rotating rod 12 and communicates with the outside. A second slider 15 is slidably connected inside the second slide groove 14, and both ends of the second slider 15 extend to the outside. Sliding sleeves 16 are fixedly connected to both ends of the second slider 15 and are fitted around the circumference of the rotating rod 12. A pressing groove 17 is formed at one end of the sliding sleeve 16 near the clamping sleeve 13. A threaded rod 18 is threadedly connected inside the second slider 15 and is located inside the second slide groove 14 and rotatably connected to the inner wall of the second slide groove 14. A rotating block 19 is fixedly connected to one end of the threaded rod 18 and one end of the rotating block 19 penetrates the inner wall of the second slide groove 14 and extends to the outside and is rotatably connected to the rotating rod 12.

[0033] In use, the user manually rotates the rotating block 19, causing the threaded rod 18 to rotate within the second slide groove 14. This causes the second slider 15 to move along the second slide groove 14 due to the action of the threaded rod 18. The second slider 15 then moves the sliding sleeve 16 along the circumference of the rotating rod 12, causing the sliding sleeve 16 to move towards the clamping sleeve 13. As the sliding sleeve 16 moves, it presses one end of the clamping sleeve 13 through the inner wall of the pressing groove 17, clamping and fixing one end of the clamping sleeve 13 to the circumference of the rotating rod 12. This fixes the rotating rod 12 within the fixing plate 10, preventing it from rotating and ensuring that the rotating rod 12 is not affected by external factors.

[0034] Example 5: This embodiment provides a feeding mechanism for pipe cutting based on automated feeding. In addition to the technical solutions of the above embodiments, it also has the following technical features: the rotating rod 12 and the clamping sleeve 13 are rotatably engaged but not connected; the sliding sleeve 16 is slidably connected to the circumference of the rotating rod 12; one end of the clamping sleeve 13 is inclined; anti-slip texture is provided on the circumference of the rotating block 19; and the extrusion groove 17 is inserted into one end of the clamping sleeve 13.

[0035] Specifically, it is ensured that when the rotating rod 12 rotates, it can rotate normally within the clamping sleeve 13 without causing the clamping sleeve 13 to rotate. It is also ensured that when the sliding sleeve 16 moves, it can slide normally around the rotating rod 12. At the same time, it is ensured that when one end of the clamping sleeve 13 is squeezed, that end of the clamping sleeve 13 will retract towards the rotating rod 12 to fix the rotating rod 12. The anti-slip texture on the rotating block 19 can increase the friction between the rotating block 19 and the hand, reducing the occurrence of hand slippage. At the same time, it is ensured that when the sliding sleeve 16 moves to the appropriate position, one end of the clamping sleeve 13 can be inserted into the compression groove 17.

[0036] Working principle: In use, the user manually rotates the rotating rod 12, causing one of the gears 11 to rotate within the cavity of the fixed plate 10. This causes one gear 11 to drive the other gear 11 to rotate in the opposite direction. When the two gears 11 rotate in opposite directions, one end of each gear 11 will drive the two transmission plates 9 to rotate in opposite directions within the limiting groove 4. When the two transmission plates 9 rotate in opposite directions, they will drive the two first sliders 8 to move closer or further apart along the first slide groove 7. This causes the two first sliders 8 to drive the slide plate 5 to move rapidly downward along the limiting groove 4. The slide plate 5 then drives the second toothed belt drive plate 6 to move rapidly downward. When the second toothed belt drive plate 6 moves rapidly downward, it will push the other toothed belt 2 towards the direction of one of the toothed belts 2, ensuring that the user can quickly adjust the gap between the two toothed belts 2 and improve the overall working efficiency of the device. In use, the user manually rotates the rotating block 19, causing the threaded rod 18 to rotate within the second slide groove 14. This causes the second slider 15 to move along the second slide groove 14 due to the action of the threaded rod 18. The second slider 15 then causes the sliding sleeve 16 to move along the circumference of the rotating rod 12, moving the sliding sleeve 16 towards the clamping sleeve 13. As the sliding sleeve 16 moves, it presses one end of the clamping sleeve 13 through the inner wall of the extrusion groove 17, clamping and fixing one end of the clamping sleeve 13 to the circumference of the rotating rod 12. This fixes the rotating rod 12 within the fixing plate 10, preventing it from rotating and ensuring that the rotating rod 12 is not affected by external factors.

[0037] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A feeding mechanism for pipe cutting based on automated feeding, comprising a mounting plate (1), two toothed belts (2), and a first toothed belt drive plate (3), wherein the two toothed belts (2) are disposed on the mounting plate (1), and the first toothed belt drive plate (3) is disposed within one of the toothed belts (2), characterized in that, Also includes: A limiting groove (4) is opened in the mounting plate (1) and connected to the outside. A sliding plate (5) is slidably connected in the limiting groove (4). A second toothed belt drive plate (6) is fixedly connected to one side of the sliding plate (5). The second toothed belt drive plate (6) is located in the inner cavity of another toothed belt (2) and is in contact with the other toothed belt (2). A first sliding groove (7) is opened on the top surface of the sliding plate (5). Two first sliders (8) are slidably connected in the first sliding groove (7). Two transmission plates (9) are rotatably connected in the limiting groove (4). One end of the two transmission plates (9) is rotatably connected to the two first sliders (8) respectively. A drive assembly is located on a mounting plate (1) and is used to drive two transmission plates (9) to rotate.

2. The feeding mechanism for pipe cutting based on automated feeding according to claim 1, characterized in that, The driving component includes: A fixing plate (10) is fixedly connected to one side of the mounting plate (1). Two gears (11) are rotatably connected to the inner wall of the fixing plate (10), and the two gears (11) mesh with each other. One end of the two gears (11) passes through one side of the mounting plate (1) and extends into the limiting groove (4) and is fixedly connected to the two transmission plates (9) respectively. The other end of one of the gears (11) is fixedly connected to a rotating rod (12), and one end of the rotating rod (12) passes through the inner wall of the fixing plate (10) and extends to the outside. A clamping assembly is located between a fixed plate (10) and a rotating rod (12) and is used to fix the rotating rod (12).

3. A feeding mechanism for pipe cutting based on automated feeding according to claim 2, characterized in that, One end of each of the two gears (11) is rotatably connected to the limiting groove (4), one end of each of the two gears (11) is rotatably connected to the mounting plate (1), and the rotating rod (12) is rotatably connected to the fixing plate (10).

4. A feeding mechanism for pipe cutting based on automated feeding according to claim 2, characterized in that, The clamping assembly includes: A clamping sleeve (13) is provided on the periphery of the rotating rod (12) and is fixedly connected to the fixing plate (10); The second slide groove (14) is opened inside the rotating rod (12) and connected to the outside. The second slide groove (14) is slidably connected to the second slider (15), and the two ends of the second slider (15) extend to the outside. The two ends of the second slider (15) are fixedly connected to the sliding sleeve (16), and the sliding sleeve (16) is sleeved on the periphery of the rotating rod (12). The sliding sleeve (16) has a pressing groove (17) at one end near the clamping sleeve (13). The second slider (15) is threadedly connected to the threaded rod (18), and the threaded rod (18) is located inside the second slide groove (14) and rotatably connected to the inner wall of the second slide groove (14). One end of the threaded rod (18) is fixedly connected to the rotating block (19), and one end of the rotating block (19) penetrates the inner wall of the second slide groove (14) and extends to the outside and rotatably connected to the rotating rod (12).

5. A feeding mechanism for pipe cutting based on automated feeding according to claim 4, characterized in that, The rotating rod (12) and the clamping sleeve (13) are rotatably engaged but not connected. The sliding sleeve (16) is slidably connected to the circumference of the rotating rod (12). One end of the clamping sleeve (13) is inclined. The rotating block (19) has anti-slip texture on its circumference. The extrusion groove (17) is inserted into one end of the clamping sleeve (13). The threaded rod (18) is located in the second sliding groove (14) and is rotatably connected to the inner wall of the second sliding groove (14).

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