A steel pipe rack

Abstract

The application discloses a steel pipe placing rack, and belongs to the technical field of steel pipe placing racks.The steel pipe placing rack comprises a bottom plate, supporting rods and an inclined table, the inclined table is fixedly provided with a baffle, the inclined table is fixedly provided with connecting rods, the connecting rods are fixedly provided with connecting barrels, the connecting barrels are installed with longitudinal rods and transverse rods, the longitudinal rods are fixedly provided with side supporting plates, the transverse rods are slidably connected with middle supporting plates, the connecting barrels, the longitudinal rods and the transverse rods are connected with transverse connecting barrels and longitudinal connecting barrels respectively, the transverse connecting barrels and the longitudinal connecting barrels are both provided with clamping holes, and the longitudinal rods and the transverse rods are both slidably provided with anti-skid blocks and spring clamping rods.The application has the beneficial effects that the steel pipe can be prevented from sliding randomly in the transportation process, the safety and stability in the transportation process are improved, the positioning and installation of the supporting plates are convenient and fast, the rotation of the side supporting plates is synchronous, and the steel pipe placing rack is convenient to control.

Description

Technical Field

[0001] This application relates to the field of steel pipe placement rack technology, and more specifically, to a steel pipe placement rack. Background Technology

[0002] Currently, stainless steel pipe is a hollow, long, round steel material. It is lighter in weight while maintaining the same bending and torsional strength, and is widely used in the manufacture of mechanical parts and engineering structures. However, stainless steel pipe needs to be stored using stacking devices before use to facilitate retrieval during subsequent use. However, existing stainless steel pipe stacking devices still have some shortcomings.

[0003] Currently, in the construction process, large quantities of steel pipes are haphazardly stacked or simply piled up on makeshift supports. However, due to the sheer number of pipes, numerous support frames are required. The non-standardized erection and dismantling of these frames consumes considerable time and resources, and the stability of the supports is difficult to guarantee. When installing or storing steel pipes, the ends are typically combined with the support frames, but the middle sections lack effective support. During installation and storage, the weak support in the middle section can easily lead to deformation of the pipes if left unsupported for extended periods, potentially affecting their normal use.

[0004] Therefore, a steel pipe rack is needed to solve the above problems. Utility Model Content

[0005] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0006] To address the technical problems mentioned in the background section, some embodiments of this application provide a steel pipe placement rack, comprising: a base plate, two sets of left-right distributed support rods fixed to the upper end of the base plate, the length of the left support rod being greater than the length of the right support rod, an inclined platform fixed to the upper end of the two sets of support rods, an upwardly extending connecting rod fixed to each of the four corners of the inclined platform, and vertically distributed connecting cylinders fixed to the outer periphery of each of the four connecting rods, a longitudinal rod connecting two adjacent front-to-back connecting cylinders, and a transverse rod connecting two adjacent left-to-right connecting cylinders, a side support plate mounted on the longitudinal rod, and a middle support plate mounted on the transverse rod, both the side support plate and the middle support plate having V-shaped grooves, the side support plate and the middle support plate being able to abut against the steel pipes to separate the upper and lower steel pipes, the side support plate being rotatably disposed at the longitudinal rod, the transverse rod being slidably disposed at the transverse rod, and a baffle fixed to the two front-to-back connecting cylinders located on the downward inclined section of the inclined platform.

[0007] Preferably, the connecting cylinder connects the longitudinal rod and the transverse rod, respectively, with a horizontal connecting cylinder and a longitudinal connecting cylinder fixed to the ends. The longitudinal rod and the transverse rod are rotatably connected to the horizontal connecting cylinder and the longitudinal connecting cylinder, respectively. Both the horizontal connecting cylinder and the longitudinal connecting cylinder have two snap-fit ​​holes, with the angle between the two snap-fit ​​holes on the same side being between 90° and 100°. Anti-slip blocks and spring clips are connected to the outer periphery of both the longitudinal rod and the transverse rod. The outer end of the anti-slip block has an arc surface that can fit against the inner end face of the horizontal connecting cylinder or the longitudinal connecting cylinder. The outer end of the spring clip has a spherical surface that can be inserted into the snap-fit ​​hole. The horizontal connecting cylinder and the longitudinal connecting cylinder have the same size, and one of the two snap-fit ​​holes is horizontally positioned and the other is upwardly positioned.

[0008] Preferably, a slot is provided on the outer periphery of the longitudinal connecting cylinder, and an abutment plate is fixed on the outer periphery of the longitudinal rod. The abutment plate can abut against the upper or lower side wall of the slot, and the opening angle of the slot is between 90° and 100°.

[0009] Preferably, the connecting rod and the connecting cylinder are hollow at the fixed connection end, and bevel gears are fixedly connected to the adjacent ends of the longitudinal rod and the transverse rod. The two bevel gears are inserted into the hollow end of the connecting rod and mesh with each other.

[0010] Preferably, connecting sleeves are fixed at both ends of the middle support plate. The connecting sleeves are elastic and have openings. An insertion slot is connected to the opening slot. Two sets of left-right symmetrical arc-shaped inserts and limiting plates are fixed on the outer periphery of the crossbar. The two arc-shaped inserts are located on the opposite sides of the two limiting plates. The arc-shaped inserts can be inserted into the insertion slots and engage with the connecting sleeves. The limiting plates can abut against the end face of the connecting sleeves. The arc of the arc-shaped insert is equal to or slightly smaller than the arc of the opening slot. The arc of the opening slot is between 90° and 120°. An insertion slot is fixed at the lower end of both opening slots. The insertion slot can abut against the front and rear ends of the tilting platform and against the front and rear sides of the steel pipes stacked on the tilting platform.

[0011] The beneficial effects of this application are as follows:

[0012] 1. The tilting platform is supported by support rods, and the heights of the left and right sets of support rods are set differently, so that the tilting platform fixed above the support rods is in a tilted state. In the tilted state, the steel pipe placed on the tilting platform can move towards the baffle and abut against the baffle, preventing the steel pipe from sliding due to insufficient friction under the action of external factors, preventing the steel pipe from sliding at will during transportation, and increasing the safety and stability of transportation.

[0013] 2. Two sliding middle support plates are provided at the crossbar. Before loading the steel pipe on top, the two middle support plates are pushed towards each other, so that the connecting sleeves on the middle support plates abut against the limiting plates. Under the rotation of the crossbar, the arc-shaped insert is inserted into the insertion groove and locked, thereby distributing the weight of the steel pipe supported on the two side support plates and preventing the steel pipe from bending under the action of gravity. The positioning and installation of the middle support plates is convenient and quick, and is synchronized with the rotation of the side support plates, which is easy to operate.

[0014] 3. The inclined platform design allows for the placement of heavier steel pipes for support on the inclined platform, while lighter steel pipes are placed on the upper side and middle support plates for support. This reasonable layout increases the stability of the base plate during movement.

[0015] 4. Both the side support plate and the middle support plate can be moved away from the tilting platform, so that steel pipes can be placed from above the tilting platform or from the left side of the tilting platform, increasing the placement options for the steel pipes during placement. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0017] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0018] In the attached diagram:

[0019] Figure 1 is a schematic diagram of the overall structure of an embodiment of a steel pipe placement rack according to this application;

[0020] Figure 2 is a front view of the embodiment in Figure 1.

[0021] Figure 3 is a schematic diagram of the overall structure of an embodiment of a steel pipe placement rack according to this application;

[0022] Figure 4 is a schematic diagram of the overall structure from another perspective in the embodiment of Figure 1;

[0023] Figure 5 is a cross-sectional schematic diagram of embodiment A in Figure 1;

[0024] Figure 6 is a cross-sectional schematic diagram of embodiment B in Figure 2;

[0025] Figure 7 is a schematic diagram of the overall structure from another perspective in the embodiment of Figure 1;

[0026] Figure 8 is an enlarged schematic diagram of point C in the embodiment of Figure 3;

[0027] Figure 9 is an enlarged schematic diagram of point D in the embodiment of Figure 4;

[0028] Figure 10 is an enlarged schematic diagram of point E in the embodiment of Figure 6;

[0029] Figure 11 is a partially enlarged schematic diagram of the connection between the connecting rod and the longitudinal and transverse rods in the embodiment;

[0030] Figure 12 is an enlarged schematic diagram of point F in the embodiment of Figure 7.

[0031] Figure label:

[0032] 10. Base plate; 11. Support rod; 12. Inclined platform; 13. Connecting rod; 14. Connecting cylinder; 15. Longitudinal rod; 16. Horizontal rod; 17. Side support plate; 18. Middle support plate; 20. Horizontal connecting cylinder; 21. Longitudinal connecting cylinder; 22. Snap-fit ​​hole; 23. Anti-slip block; 24. Spring clip; 30. Abutment plate; 31. Slot; 40. Arc-shaped insert; 41. Limiting plate; 50. Connecting sleeve; 51. Opening slot; 52. Insertion slot; 60. Baffle; 61. Bevel gear. Detailed Implementation

[0033] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0034] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0035] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0036] It should be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" 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.

[0037] It should be noted that, in this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0039] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] Referring to Figures 1-5, a steel pipe placement rack includes: a base plate 10, with two sets of left-right distributed support rods 11 fixed to the upper end of the base plate 10. The length of the left support rod 11 is greater than the length of the right support rod 11. An inclined platform 12 is fixed to the upper end of the two sets of support rods 11. Connecting rods 13 extending upwards are fixed to the four corners of the inclined platform 12. Connecting cylinders 14 distributed vertically are fixed to the outer periphery of the four connecting rods 13. A longitudinal rod 15 connects two adjacent connecting cylinders 14, and a transverse rod 16 connects two adjacent connecting cylinders 14. A side support plate 17 is installed on the longitudinal rod 15, and a middle support plate 18 is installed on the transverse rod 16. The side support plate 17 and the middle support plate 18 are arranged in a strip shape above the inclined platform 12. V-shaped grooves are opened on both the side support plate 17 and the middle support plate 18. A steel pipe that can abut against the steel pipe to separate the upper and lower sides; a side support plate 17 is rotatably set at the longitudinal bar 15; a horizontal bar 16 is slidably set at the horizontal bar 16; and two connecting cylinders 14 at the front and rear, and a baffle 60 is fixed at the downward inclined end of the inclined platform 12.

[0041] The base plate 10 abuts against the ground. Support rods 11 of varying lengths at both ends tilt the upper inclined platform 12, allowing steel pipes to be placed on it. The upper end of the inclined platform 12 has evenly distributed V-shaped grooves that abut against the steel pipes to prevent them from sliding. The steel pipes, placed on the inclined platform 12, abut against the baffle 60 due to the tilt of the platform 12. The connecting rod 13 has two layers of connecting cylinders 14, which separate the upper and lower layers of steel pipes through the side support plate 17 and the middle support plate 18, thus enabling the separate placement of two different types of steel pipes.

[0042] Referring to Figures 3 and 11, the connecting cylinder 14 is connected to the longitudinal rod 15 and the horizontal rod 16, respectively, with a horizontal connecting cylinder 20 and a longitudinal connecting cylinder 21 fixed at their ends. The longitudinal rod 15 and the horizontal rod 16 are rotatably connected to the horizontal connecting cylinder 20 and the longitudinal connecting cylinder 21, respectively. Both the horizontal connecting cylinder 20 and the longitudinal connecting cylinder 21 have two locking holes 22, with the angle between the two locking holes 22 on the same side between 90° and 100°. Anti-slip blocks 23 and spring catch rods 24 are connected to the outer periphery of both the longitudinal rod 15 and the horizontal rod 16. The outer end of the anti-slip block 23 has an arc surface that can fit against the inner end face of the horizontal connecting cylinder 20 or the longitudinal connecting cylinder 21. The arc surface of the anti-slip block 23 is consistent with the inner circumferential surface of the horizontal connecting cylinder 20 and the longitudinal connecting cylinder 21. The outer end of the spring catch rod 24 has a spherical surface that can be inserted into the locking hole 22. The horizontal connecting cylinder 20 and the longitudinal connecting cylinder 21... The dimensions are consistent, with one of the two snap-fit ​​holes 22 set horizontally and the other upward;

[0043] By rotating the longitudinal rod 15, the side support plate 17 fixedly connected to the longitudinal rod 15 rotates circumferentially, as shown in Figure 3. The position of the side support plate 17 changes from the upper side support plate 17 to the lower side support plate 17. The side support plate 17 is set perpendicular to the tilting platform 12. At this time, the spring clip 24 is inserted into the snap-fit ​​hole 22 for positioning, allowing steel pipes to be placed and stacked above the side support plate 17. The anti-slip block 23 is abutted in the horizontal connecting cylinder 20 or the vertical connecting cylinder 21. The anti-slip block 23 provides force through the spring and abuts against the horizontal connecting cylinder 20 or the vertical connecting cylinder 21 through the arc surface of the anti-slip block 23, increasing the contact area. Thus, the anti-slip block 23 can increase the resistance of the longitudinal rod 15 or the horizontal rod 16 during the rotation process, improving the rotational stability of the longitudinal rod 15 and the horizontal rod 16.

[0044] Referring to Figures 1, 2, and 12, a slot 31 is provided on the outer periphery of the longitudinal connecting cylinder 21, and an abutment plate 30 is fixed on the outer periphery of the longitudinal rod 15. The abutment plate 30 can abut against the upper or lower side wall of the slot 31. The opening angle of the slot 31 is between 90° and 100°. When the abutment plate 30 abuts against the upper side wall of the slot 31, the side support plate 17 fixedly connected to the longitudinal rod 15 is positioned left and right (as marked in Figure 1), abutting against the lower end of the steel pipe through the side support plate 17. When the abutment plate 30 abuts against the lower side wall of the slot 31, the side support plate 17 is positioned up and down (as marked in Figure 2). At this time, the opening angle of the slot 31 is set at 90° (the left side support plate 17 tilts to the right with a tendency to rotate to the right). By increasing the opening angle of the slot 31, two snap-fit ​​holes 22 are also added simultaneously. The angle between the two slots is adjusted so that when the tilting platform 12 is tilted as a whole, the slot 31 can continue to rotate downwards, thereby causing the upper side support plate 17 to swing to the left, thus eliminating the tendency of the side support plate 17 to rotate to the right, and preventing the two upper side support plates 17 from blocking the downward placement of the steel pipe. This reduces the possibility of the side support plate 17 deflecting due to accidental contact with it during the placement of the steel pipe. By simultaneously increasing the angle between the two snap-fit ​​holes 22, the spring clip 24 travels a longer distance into the two snap-fit ​​holes 22, so that when the slot 31 abuts against the lower side wall of the abutment plate 30, the spring clip 24 is inserted into the snap-fit ​​hole 22 for positioning.

[0045] Referring to Figure 10, the connecting rod 13 and the connecting cylinder 14 are fixedly connected at hollow ends. Bevel gears 61 are fixedly connected to the adjacent ends of the longitudinal rod 15 and the transverse rod 16. The two bevel gears 61 are inserted into the hollow end of the connecting rod 13 and mesh with each other. By rotating one longitudinal rod 15 or one transverse rod 16, the meshing of the bevel gears 61 pushes the two longitudinal rods 15 and the two transverse rods 16 to rotate, causing the side support plate 17 fixedly connected to the longitudinal rod 15 to rotate downwards, making the side support plate 17 abut against the steel pipe below. This causes the transverse rod 16 to rotate, allowing the arc-shaped insert 40 to be inserted into the insertion slot 52 to engage the connecting sleeve 50 for positioning. The upper ends of the side support plate 17 and the middle support plate 18 are set at the same height to support the new layer of steel pipe.

[0046] Refer to Figure 1 and Figure 8-9Connecting sleeves 50 are fixed to both ends of the middle support plate 18. The connecting sleeves 50 are elastic and have openings 51. Insertion slots 52 are connected to the openings 51. Two sets of symmetrical arc-shaped inserts 40 and limiting plates 41 are fixed to the outer periphery of the crossbar 16. The two arc-shaped inserts 40 are located on the opposite sides of the two limiting plates 41. The arc-shaped inserts 40 can be inserted into the insertion slots 52 and engage with the connecting sleeves 50. The limiting plates 41 can abut against the end face of the connecting sleeves 50. The arc of the arc-shaped inserts 40 is equal to or slightly smaller than the arc of the opening of the opening slots 51, which is between 90° and 120°. Insertion slots 52 are fixed to the lower ends of both opening slots 51. The insertion slots 52 can abut against the front and rear ends of the tilting platform 12 and can also be stacked on the tilting platform 12. The front and rear sides of the steel pipe abut against each other;

[0047] Initially, the two middle support plates 18 are far apart, as shown by the middle support plate 18 marked at the top of Figure 1. The connecting sleeve 50 on the middle support plate 18 is elastic. Under the action of elasticity, the inner end of the connecting sleeve 50 can contract, so that the connecting sleeve 50 is inserted on the outer periphery of the crossbar 16. By pushing the middle support plate 18 left and right, the middle support plate 18 can overcome the force between the connecting sleeve 50 and the crossbar 16 and slide, thereby bringing the two middle support plates 18 closer to each other. The connecting sleeves 50 on the left and right middle support plates 18 can abut against the limiting plate 41 fixed on the outer periphery of the crossbar 16. At this time, the connecting sleeve 50 stops, and the state of the middle support plate 18 is shown by the middle support plate 18 marked at the bottom of Figure 1. At this time, by rotating the longitudinal bar 15 or the crossbar 16, they rotate synchronously under the connection of the bevel gear 61, thereby causing the longitudinal bar 15 to drive the side support plate 17 to swing downward and fit against the lower inner end steel pipe, and the crossbar 16 The curved insert 40 is rotated, causing it to rotate upward and insert into the insertion slot 52 for engagement. The movement of the lower limb middle support plate 18 forms two middle support plates 18 at the close ends of the two side support plates 17, providing support and preventing the steel pipe above from bending and deforming under the pressure of stacking.

[0048] Working process or usage method:

[0049] 1. The base plate 10 abuts against the ground. Support rods 11 of varying lengths at both ends tilt the upper inclined platform 12, allowing steel pipes to be placed on it. The upper end of the inclined platform 12 has evenly distributed V-shaped grooves to abut against the steel pipes and prevent them from sliding. The steel pipes placed on the inclined platform 12 abut against the baffle 60 due to the tilt of the platform 12. The connecting rod 13 has two layers of connecting cylinders 14, which can separate the upper and lower layers of steel pipes through the side support plate 17 and the middle support plate 18, thus allowing for the separate placement of two different types of steel pipes. Transportation can be carried out manually by installing casters on the lower base plate 10, or by installing hooks on the base plate 10 to connect the base plate 10 to hoisting equipment for lifting.

[0050] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A steel pipe placement rack, characterized in that, include: A base plate (10) is provided with a support rod (11) fixed at its upper end. An inclined platform (12) is fixed on the support rod (11). A baffle (60) is fixed at the inclined end of the inclined platform (12). A connecting rod (13) is fixed on the inclined platform (12). A connecting cylinder (14) is fixed on the connecting rod (13). A longitudinal rod (15) and a transverse rod (16) are installed on the connecting cylinder (14). A side support plate (17) is fixed on the longitudinal rod (15), and a middle support plate (18) is slidably connected on the cross rod (16). The side support plate (17) and the middle support plate (18) are set at the same height. The longitudinal rod (15) and the cross rod (16) are both rotatably engaged with the connecting cylinder (14). The connecting cylinder (14) is fixed with a horizontal connecting cylinder (20) and a vertical connecting cylinder (21) at the connection ends of the vertical rod (15) and the horizontal rod (16), respectively. Both the horizontal connecting cylinder (20) and the vertical connecting cylinder (21) are provided with snap-fit ​​holes (22). Both the vertical rod (15) and the horizontal rod (16) are provided with anti-slip blocks (23) and spring clips (24). The spring clips (24) can be inserted into the snap-fit ​​holes (22). One of the two snap-fit ​​holes (22) is set horizontally and the other is set upward.

2. The steel pipe placement rack according to claim 1, characterized in that: The crossbar (16) is fixed with symmetrical arc-shaped inserts (40) and limiting plates (41) on its outer periphery. The two arc-shaped inserts (40) are located on the opposite sides of the two limiting plates (41). The front and rear ends of the middle support plate (18) are fixed with connecting sleeves (50). The connecting sleeves (50) are provided with opening slots (51) and insertion slots (52). The two middle support plates (18) are located on the opposite sides of the two arc-shaped inserts (40). The arc-shaped inserts (40) can be inserted into the insertion slots (52).

3. The steel pipe placement rack according to claim 1, characterized in that: The connecting rod (13) is fixedly connected to the hollow end of the connecting cylinder (14). The longitudinal rod (15) and the cross rod (16) are fixed with bevel gears (61) at their close ends. The two bevel gears (61) are located at the hollow end of the connecting rod (13) and mesh with each other.

4. A steel pipe placement rack according to claim 1, characterized in that: The outer end of the anti-blocking block (23) is provided with an arc surface, and the arc surface of the anti-blocking block (23) is consistent with the inner circumferential surface of the horizontal connecting cylinder (20) and the vertical connecting cylinder (21). The outer end of the spring clip (24) is provided with a spherical surface, and the spherical surface is inserted into the clip hole (22).

5. A steel pipe placement rack according to claim 1, characterized in that: An abutment plate (30) is fixed on the outer periphery of the longitudinal rod (15). A slot (31) is provided on the outer periphery of the longitudinal connecting cylinder (21) and on the periphery of the abutment plate (30). The abutment plate (30) can abut against the upper and lower side walls of the slot (31).

6. A steel pipe placement rack according to claim 2, characterized in that: The arc of the arc-shaped insert (40) is equal to or less than the arc of the opening groove (51).

7. A steel pipe placement rack according to claim 1, characterized in that: The inclined platform (12) is plate-shaped, and the side support plate (17) and the middle support plate (18) are strip-shaped above the inclined platform (12). The inclined platform (12), the side support plate (17) and the middle support plate (18) are all provided with V-shaped grooves, which are evenly distributed front and back.

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