Pipeline supporting device

Abstract

The invention provides a pipeline supporting device. The pipeline supporting device comprises a support and a supporting rod, the supporting frame comprises at least two supporting rings, the at least two supporting rings are arranged on the support at intervals in the transverse direction of the support, a plurality of clamping plates are arranged in each supporting ring, and the multiple clamping plates are arranged in the supporting rings at intervals in the circumferential direction of the supporting rings; and the first transmission assemblies are arranged between every two adjacent supporting rings, the first transmission assemblies are in driving connection with the multiple clamping plates of each supporting ring so that the multiple clamping plates can move in the radial direction of the supporting rings, and the multiple clamping plates can jointly define a clamping groove for clamping a pipeline. Through the technical scheme provided by the invention, the problem that the service life of a pipeline in the related technology is short can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of transport pipelines, and in particular to a pipeline supporting device. Background Art

[0002] Liquid carbon dioxide refers to carbon dioxide gas liquefied into liquid form under high pressure and low temperature. Liquid carbon dioxide is a refrigerant that can be used to preserve food and for artificial rainfall. It is also an industrial raw material that can be used to make soda ash, urea and soda. Liquid carbon dioxide is widely used in mining areas, medical treatment and manufacturing. During its use, it requires a delivery pipe to ensure the state of liquid carbon dioxide.

[0003] In the relevant technology, carbon dioxide pipelines are generally buried directly underground during installation. However, the underground conditions are complicated, and the load on the road surface changes. The pipelines buried deep in the soil will also be affected by the load, which can easily damage the carbon dioxide transmission pipelines. Therefore, it is necessary to add safety protection devices outside the carbon dioxide pipelines for maintenance to reduce damage to the carbon dioxide pipelines.

[0004] However, the existing pipeline transportation device cannot effectively fix the pipeline, which easily causes the protective device to loosen, thereby reducing the service life of the carbon dioxide pipeline. Summary of the invention

[0005] The present invention provides a pipeline supporting device to solve the problem of low service life of pipelines in the related art.

[0006] The present invention provides a pipeline support device, which includes: a bracket; a support frame, including at least two support rings, at least two support rings are arranged on the bracket at intervals along the lateral direction of the bracket, each support ring is provided with a plurality of clamping plates, and the plurality of clamping plates are arranged in the support ring at intervals along the circumference of the support ring; a first transmission component is arranged between two adjacent support rings, the first transmission component is drivingly connected to the plurality of clamping plates of each support ring so that the plurality of clamping plates can move radially along the support ring, and the plurality of clamping plates can jointly form a clamping groove for clamping the pipeline.

[0007] Further, the first transmission assembly includes a transmission ring and a plurality of first transmission rods, the plurality of first transmission rods are arranged at intervals along the circumference of the transmission ring, the plurality of first transmission rods all extend laterally, the first transmission rods are passed through at least two support rings, the transmission ring is driven and connected to the plurality of first transmission rods respectively so that the plurality of first transmission rods rotate around their own axes, each first transmission rod is correspondingly provided with a clamping plate, and each first transmission rod is driven and connected to the corresponding clamping plate so that the clamping plates all move radially along the support ring.

[0008] Furthermore, the first transmission assembly also includes a plurality of transmission sleeves, which are arranged at intervals along the circumference of the transmission ring and extend radially along the transmission ring. The transmission sleeves are movably arranged in the support ring along the radial direction of the support ring. Each first transmission rod is driven and connected to the corresponding transmission sleeve so that the transmission sleeve rotates around its own axis. The plurality of transmission sleeves are driven and connected to the plurality of clamping plates so that the clamping plates move radially along the support ring.

[0009] Furthermore, the first transmission assembly also includes multiple transmission shafts, which are arranged at intervals along the circumference of the transmission ring and extend radially along the transmission ring. Each transmission sleeve is penetrated by a transmission shaft and is threadedly connected to the transmission shaft. The clamping plate is arranged at the end of the transmission shaft. When the transmission sleeve rotates, the transmission shaft can move radially along the transmission ring.

[0010] Furthermore, a worm wheel is arranged at the end of the transmission sleeve, a worm is connected to the first transmission rod, and the worm wheel and the worm are meshed with each other.

[0011] Furthermore, the transmission ring is rotatably arranged around its own axis, the transmission ring has an inner gear ring, the first transmission rod is sleeved with an outer gear ring, and the inner gear ring and the outer gear ring are meshed.

[0012] Furthermore, a limiting ring is arranged on the supporting ring, and the first transmission rod is passed through the limiting ring and is rotatably connected to the limiting ring.

[0013] Furthermore, the pipeline support device also includes a second transmission assembly, which includes a second transmission rod extending laterally, and both ends of the second transmission rod are respectively connected to the bracket and one of the support rings to enable one of the support rings to move laterally, and one of the support rings can drive the remaining support rings to move laterally through the first transmission assembly.

[0014] Furthermore, the second transmission assembly also includes a screw rod, which is arranged on the bracket and extends vertically. The first end of the second transmission rod is hingedly provided with a threaded sleeve, the threaded sleeve is sleeved on the screw rod, and the second end of the second transmission rod is hinged to one of the support rings.

[0015] Furthermore, the bracket includes a transverse plate and vertical plates arranged at both ends of the transverse plate and extending vertically. The two vertical plates are provided with avoidance holes for avoiding the pipes. A sliding rod extending horizontally is connected between the two vertical plates. Sliding grooves are provided on the two support rings, and the sliding rod is inserted into the sliding grooves.

[0016] The technical solution of the present invention is applied, and the pipeline support device includes a bracket, a support frame, and a first transmission component. The pipeline is inserted into at least two support rings, and the first transmission component is used to drive multiple clamping plates to move radially along the support ring, so that the multiple clamping plates surround a clamping groove for clamping the pipeline, thereby supporting the pipeline. By arranging at least two support rings along the lateral direction of the bracket, at least two support rings can be used to support multiple positions of the pipeline along the axial direction of the pipeline, so that the support effect is better. Compared with the existing method of burying pipelines underground, since there is no need to set up a safety protection device, the fixing effect of the pipeline is better and the service life is longer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic structural diagram of a pipeline support device provided according to an embodiment of the present invention is shown;

[0019] Figure 2 A side view of a transmission ring of a pipeline support device provided in an embodiment of the present invention is shown;

[0020] Figure 3 A side view of a support ring of a pipeline support device provided according to an embodiment of the present invention is shown;

[0021] Figure 4 Shows Figure 3 A partial enlarged view of point A in the middle.

[0022] The above drawings include the following reference numerals:

[0023] 1. Horizontal plate; 2. Vertical plate; 3. Mounting shell; 4. Screw; 5. Threaded sleeve; 6. Second transmission rod; 7. Connecting plate; 8. Support ring; 9. First transmission rod; 11. Mounting groove; 12. Worm gear; 13. Transmission sleeve; 14. Transmission shaft; 15. Clamping plate; 16. Sliding rod; 17. Sliding block; 18. Outer gear ring; 19. Limiting ring; 20. Transmission ring; 21. Handle; 22. Twist handle; 23. Avoidance hole. DETAILED DESCRIPTION

[0024] The following will be combined with the 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 described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figures 1 to 4 As shown, an embodiment of the present invention provides a pipeline support device, which includes a bracket, a support frame, and a first transmission assembly. The support frame includes at least two support rings 8, and the at least two support rings 8 are arranged on the bracket at intervals along the lateral direction of the bracket. Each support ring 8 is provided with a plurality of clamping plates 15, and the plurality of clamping plates 15 are arranged in the support ring 8 at intervals along the circumference of the support ring 8; the first transmission assembly is arranged between two adjacent support rings 8, and the first transmission assembly is drivenly connected to the plurality of clamping plates 15 of each support ring 8 so that the plurality of clamping plates 15 can move radially along the support ring 8, and the plurality of clamping plates 15 can jointly form a clamping groove for clamping the pipeline.

[0026] The technical solution of the present invention is applied, and the pipeline support device includes a bracket, a support frame, and a first transmission component. The pipeline is inserted into at least two support rings 8, and the first transmission component is used to drive multiple clamping plates 15 to move radially along the support ring 8, so that the multiple clamping plates 15 surround a clamping groove for clamping the pipeline, thereby supporting the pipeline. By arranging at least two support rings 8 along the lateral direction of the bracket, at least two support rings 8 can be used to support multiple positions of the pipeline along the axial direction of the pipeline, so that the supporting effect is better. Compared with the existing method of burying pipelines underground, since there is no need to set up safety protection devices, the fixing effect of the pipeline is better and the service life is longer.

[0027] In this embodiment, by utilizing the first transmission assembly to simultaneously drive the plurality of clamping plates 15 of each support ring to move, the number of transmission components can be reduced, thus saving costs.

[0028] It should be noted that, in order to improve transmission efficiency and facilitate operation, four support rings 8 are provided on the support frame, and the four support rings 8 are divided into two groups, and the clamping plates 15 of each group of support rings 8 are driven by a first transmission assembly. In addition, the lateral relative positions of the two groups of support rings 8 can be adjusted to adjust the supporting position of the pipeline.

[0029] like Figure 1As shown, the first transmission assembly includes a transmission ring 20 and a plurality of first transmission rods 9, the plurality of first transmission rods 9 are arranged at intervals along the circumference of the transmission ring 20, the plurality of first transmission rods 9 all extend in the transverse direction, the first transmission rods 9 are inserted in at least two support rings 8, the transmission ring 20 is respectively connected to the plurality of first transmission rods 9 by driving, so that the plurality of first transmission rods 9 rotate around their own axes, each first transmission rod 9 is correspondingly provided with a clamping plate 15, and each first transmission rod 9 is connected to the corresponding clamping plate 15 by driving, so that the clamping plate 15 moves along the radial direction of the support ring 8. By adopting the above-mentioned first transmission assembly, the transmission ring 20 drives the first transmission rod 9 to rotate around its own axis, so that the first transmission rod 9 can drive the corresponding clamping plate 15 to move along the radial direction of the support ring 8.

[0030] In order to enable the multiple first transmission rods 9 to rotate around their own axes, the transmission ring 20 and the multiple first transmission rods 9 can adopt a tooth transmission method or a chain transmission method, as long as the multiple first transmission rods 9 can rotate simultaneously.

[0031] In this embodiment, the first transmission rod 9 rotates around its own axis to drive the clamping plate 15 to move radially, so that the rotational motion of the first transmission rod 9 can be converted into the linear motion of the clamping plate 15 to achieve power transmission.

[0032] like Figure 3 and Figure 4 As shown, the first transmission assembly also includes a plurality of transmission sleeves 13, which are arranged at intervals along the circumference of the transmission ring 20 and extend in the radial direction of the transmission ring 20. The transmission sleeves 13 are movably arranged in the radial direction of the support ring 8. Each first transmission rod 9 is drivingly connected to the corresponding transmission sleeve 13 so that the transmission sleeve 13 rotates around its own axis. The plurality of transmission sleeves 13 are drivingly connected to the plurality of clamping plates 15 so that the clamping plates 15 all move in the radial direction of the support ring 8. With the above structure, during the rotation of the first transmission rod 9, the transmission sleeve 13 can be driven to rotate around its own axis, thereby driving the clamping plate 15 to move in the radial direction.

[0033] In this embodiment, since the first transmission rod 9 needs to drive the radial movement of the clamping plates 15 in the two adjacent support rings 8, the first transmission rod 9 only rotates around its own axis and does not have other forms of movement. Then, the power is transmitted to the clamping plates 15 through the transmission sleeve 13.

[0034] It should be noted that transmission sleeves 13 are correspondingly provided at both ends of the first transmission rod 9 .

[0035] In this embodiment, the support ring 8 is a double-layer structure, and a mounting groove 11 is formed between the double-layer structure. The first transmission rod 9 extends into the mounting groove 11 .

[0036] like Figure 3 and Figure 4 As shown, the first transmission assembly also includes a plurality of transmission shafts 14, which are arranged at intervals along the circumference of the transmission ring 20 and extend in the radial direction of the transmission ring 20. A transmission shaft 14 is inserted into each transmission sleeve 13 and is threadedly connected to the transmission shaft 14. A clamping plate 15 is arranged at the end of the transmission shaft 14. When the transmission sleeve 13 rotates, the transmission shaft 14 can move in the radial direction of the transmission ring 20. With the above arrangement, since the transmission sleeve 13 is rotatably arranged on the transmission ring 20, when the transmission sleeve 13 rotates, the transmission shaft 14 can be moved in the radial direction through threaded transmission, thereby driving the clamping plate 15 to move in the radial direction.

[0037] like Figure 3 and Figure 4 As shown, a worm wheel 12 is provided at the end of the transmission sleeve 13, a worm is connected to the first transmission rod 9, and the worm wheel 12 is meshed with the worm. The transmission mode in which the worm and the worm wheel 12 are meshed can turn the direction of power transmission, and has the advantages of simple structure and easy setting.

[0038] In other embodiments, bevel gear transmission may be used to perform steering during power transmission.

[0039] like Figure 2 As shown, the transmission ring 20 is rotatably arranged around its own axis, and the transmission ring 20 has an inner gear ring, and the first transmission rod 9 is sleeved with an outer gear ring 18, and the inner gear ring and the outer gear ring 18 are meshed. With the above structure, the rotational motion of the transmission ring 20 can be converted into the rotational motion of the first transmission rod 9 by the meshing of the inner gear ring and the outer gear ring 18, which has the advantages of simple structure and easy arrangement.

[0040] In this embodiment, a handle 21 is provided on the outer circumference of the transmission ring 20 , and the transmission ring 20 can be rotated by operating the handle 21 .

[0041] like Figure 2 As shown, a limiting ring 19 is provided on the support ring 8, and the first transmission rod 9 is passed through the limiting ring 19 and is rotatably connected to the limiting ring 19. The limiting ring 19 can limit the first transmission rod 9 so that the first transmission rod 9 can only rotate around its own axis, and will not follow the transmission ring 20 to revolve.

[0042] like Figure 1As shown, the pipeline support device also includes a second transmission assembly, which includes a second transmission rod 6 extending in the transverse direction, and the two ends of the second transmission rod 6 are respectively connected to the bracket and one of the support rings 8, so that one of the support rings 8 can move in the transverse direction, and one of the support rings 8 can drive the remaining support rings 8 to move in the transverse direction through the first transmission assembly. With the above structure, one of the support rings 8 is driven to move by the second transmission rod 6, and the remaining support rings 8 are driven to move by the first transmission assembly, which has the advantages of simple structure and easy setting.

[0043] The second transmission rod 6 can change its length to drive the support ring 8 to move. Alternatively, the support ring 8 can be driven to move by other additional components.

[0044] like Figure 1 As shown, the second transmission assembly also includes a screw rod 4, which is arranged on the bracket and extends vertically, a first end of the second transmission rod 6 is hingedly provided with a threaded sleeve 5, the threaded sleeve 5 is sleeved on the screw rod 4, and the second end of the second transmission rod 6 is hingedly connected to one of the support rings 8. With the above structure, by rotating the screw rod 4, the threaded sleeve 5 can be driven to move along the axial direction of the screw rod 4, thereby changing the angle between the second transmission rod 6 and the screw rod 4, so that the second transmission rod 6 drives the support ring 8 to move.

[0045] A mounting shell 3 is disposed on the bracket, and a screw rod 4 is rotatably disposed in the mounting shell 3 .

[0046] In this embodiment, two threaded sleeves 5 are sleeved on each screw rod 4. When the screw rod 4 rotates, the two threaded sleeves 5 can move in opposite directions. The two threaded sleeves 5 are respectively hinged to the corresponding second transmission rod 6, thereby changing the angle between the threaded sleeve 5 and the second transmission rod 6. When the two threaded sleeves 5 are close to each other, the support ring 8 is away from the screw rod 4.

[0047] A connecting plate 7 is provided on one of the supporting rings 8 , and the second transmission rod 6 is hingedly connected to the connecting plate 7 .

[0048] Specifically, a twist handle 22 is provided at the end of the screw rod 4 , and the screw rod 4 can be rotated by operating the twist handle 22 .

[0049] like Figure 1 As shown, the bracket includes a horizontal plate 1 and vertical plates 2 arranged at both ends of the horizontal plate 1 and extending in the vertical direction. The two vertical plates 2 are both provided with avoidance holes 23 for avoiding the pipe. A sliding rod 16 extending in the horizontal direction is connected between the two vertical plates 2. A sliding groove is arranged on the two support rings 8, and the sliding rod 16 is inserted into the sliding groove. With the above structure, the pipe can pass through the vertical plate 2 through the avoidance hole 23 and then be inserted into the support ring 8. The support ring 8 can be guided by the cooperation of the sliding rod 16 and the sliding groove so that the support ring 8 can move smoothly.

[0050] In this embodiment, a sliding block 17 is provided at the lower portion of each supporting ring 8 , and a sliding groove is provided through the sliding block 17 .

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0053] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0054] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0055] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pipeline support device, characterized in that: The pipeline supporting device comprises: Bracket; A support frame, comprising at least two support rings (8), at least two of the support rings (8) being arranged on the support frame at intervals along the lateral direction of the support frame, a plurality of clamping plates (15) being arranged in each of the support rings (8), and the plurality of clamping plates (15) being arranged in the support ring (8) at intervals along the circumferential direction of the support ring (8); A first transmission assembly is arranged between two adjacent support rings (8), and the first transmission assembly is drivingly connected to a plurality of clamping plates (15) of each support ring (8), so that the plurality of clamping plates (15) move radially along the support ring (8), and the plurality of clamping plates (15) can jointly form a clamping groove for clamping the pipe.

2. The pipeline support device according to claim 1, characterized in that: The first transmission assembly comprises a transmission ring (20) and a plurality of first transmission rods (9), wherein the plurality of first transmission rods (9) are arranged at intervals along the circumference of the transmission ring (20), and the plurality of first transmission rods (9) all extend in the transverse direction, and the first transmission rods (9) are inserted into at least two of the support rings (8). The transmission ring (20) is respectively driven and connected with the plurality of first transmission rods (9) so that the plurality of first transmission rods (9) rotate around their own axes, and each of the first transmission rods (9) is correspondingly provided with a clamping plate (15), and each of the first transmission rods (9) is driven and connected with the corresponding clamping plate (15) so that the clamping plate (15) moves radially along the support ring (8).

3. The pipeline support device according to claim 2, characterized in that: The first transmission assembly further comprises a plurality of transmission sleeves (13), the plurality of transmission sleeves (13) being arranged at intervals along the circumference of the transmission ring (20) and extending in the radial direction of the transmission ring (20), the transmission sleeves (13) being movably arranged in the support ring (8) in the radial direction of the support ring (8), each of the first transmission rods (9) being drivingly connected to the corresponding transmission sleeve (13) so that the transmission sleeve (13) rotates around its own axis, and the plurality of transmission sleeves (13) being drivingly connected to the plurality of clamping plates (15) so that the clamping plates (15) all move in the radial direction of the support ring (8).

4. The pipeline support device according to claim 3, characterized in that: The first transmission assembly further comprises a plurality of transmission shafts (14), the plurality of transmission shafts (14) being arranged at intervals along the circumference of the transmission ring (20) and extending in the radial direction of the transmission ring (20), each transmission sleeve (13) being provided with the transmission shaft (14) and being threadedly connected to the transmission shaft (14), the clamping plate (15) being arranged at the end of the transmission shaft (14), and the transmission shaft (14) being able to move in the radial direction of the transmission ring (20) when the transmission sleeve (13) rotates.

5. The pipeline support device according to claim 3, characterized in that: A worm wheel (12) is provided at the end of the transmission sleeve (13), a worm is connected to the first transmission rod (9), and the worm wheel (12) and the worm are meshed.

6. The pipeline support device according to claim 2, characterized in that: The transmission ring (20) is rotatably arranged around its own axis, and the transmission ring (20) has an inner gear ring. The first transmission rod (9) is sleeved with an outer gear ring (18), and the inner gear ring and the outer gear ring (18) are meshed.

7. The pipeline support device according to claim 6, characterized in that: A limiting ring (19) is provided on the support ring (8), and the first transmission rod (9) passes through the limiting ring (19) and is rotatably connected to the limiting ring (19).

8. The pipeline support device according to claim 1, characterized in that: The pipeline support device also includes a second transmission assembly, which includes a second transmission rod (6) extending in the transverse direction, and the two ends of the second transmission rod (6) are respectively connected to the bracket and one of the support rings (8) so that one of the support rings (8) can move in the transverse direction, and one of the support rings (8) can drive the other support rings (8) to move in the transverse direction through the first transmission assembly.

9. The pipeline support device according to claim 8, characterized in that: The second transmission assembly further comprises a screw rod (4), the screw rod (4) being arranged on the bracket and extending vertically, a first end of the second transmission rod (6) being hingedly provided with a threaded sleeve (5), the threaded sleeve (5) being sleeved on the screw rod (4), and a second end of the second transmission rod (6) being hingedly connected to one of the support rings (8).

10. The pipeline support device according to claim 1, characterized in that: The bracket comprises a transverse plate (1) and vertical plates (2) arranged at both ends of the transverse plate (1) and extending in the vertical direction, the two vertical plates (2) are each provided with an escape hole (23) for escaping the pipeline, a sliding rod (16) extending in the transverse direction is connected between the two vertical plates (2), and the two support rings (8) are each provided with a sliding groove, and the sliding rod (16) is inserted into the sliding groove.

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