Autoclaved aerated concrete block bottom skin cutting equipment

Abstract

The utility model discloses autoclaved aerated concrete block bottom skin cutting equipment which is characterized in that the inner wall of a box body is fixedly connected with a transverse plate, the bottom of the transverse plate is fixedly connected with a first hydraulic cylinder, and the output end of the first hydraulic cylinder is fixedly connected with a cutter. The autoclaved aerated concrete block bottom skin cutting equipment relates to the technical field of concrete block processing and is characterized in that a protection box, a motor, a first bevel gear, a vertical column, a second bevel gear, a threaded rod, a connecting rod, a first sliding block, a first sliding groove, a short plate, a collecting cover and a guide pipe are matched; dust generated during concrete block bottom skin cutting is collected, and the problems that when existing bottom skin cutting equipment is used for cutting the bottom skin of the concrete block, a large amount of dust is generated and enters air, and when an operator breathes, the dust in the air possibly enters a respiratory system of the operator, so that the dust cannot enter the respiratory system of the operator are solved. And harm to the respiratory system of an operator can be caused, and the body health is influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete block processing, in particular to a device for removing the bottom skin of an autoclaved aerated concrete block. Background Art

[0002] Autoclaved aerated concrete blocks are a kind of porous concrete products made from fly ash, lime, cement, gypsum, slag and other main raw materials, with appropriate amount of gas generating agent, regulator, bubble stabilizer, and through the process of batching, mixing, pouring, static stopping, cutting and high-pressure steaming. When making autoclaved aerated concrete blocks, autoclaved aerated concrete block bottom skin removal equipment is required.

[0003] For example, a device for cutting the bottom skin of an autoclaved aerated concrete block with authorization number CN221136304U belongs to the field of concrete block technology and includes a placing component, on which a limiting component and a pushing component are provided. Although in the utility model, two clamping components close to each other will place the concrete block on the placing table and close to the limiting component and limit it to the middle position of the workbench, the working driving component drives the cutting component to move downward and then cuts off the bottom skin of the cut block fixed in the middle position of the workbench. The operation is simple, and because the working cutting component can change the position of the concrete block it cuts off, the device can be adjusted according to actual conditions and then cut off the bottom skin of concrete blocks of different sizes, thereby improving the applicability of the device.

[0004] However, the existing bottom skin removal equipment will generate a large amount of dust when removing the bottom skin of concrete blocks. This dust will enter the air. When the operator breathes, the dust in the air may enter the operator's respiratory system, causing harm to the operator's respiratory system and affecting his health. Utility Model Content

[0005] In response to the shortcomings of the existing technology, the utility model provides an autoclaved aerated concrete block bottom skin removal device, which solves the problem that the existing bottom skin removal device generates a large amount of dust when removing the bottom skin of the concrete block. The dust will enter the air. When the operator breathes, the dust in the air may enter the operator's respiratory system, causing harm to the operator's respiratory system and affecting physical health.

[0006] To achieve the above-mentioned purpose, the utility model is implemented through the following technical solutions: an autoclaved aerated concrete block bottom skin cutting device, comprising a box body, the inner wall of the box body is fixedly connected to a horizontal plate, the bottom of the horizontal plate is fixedly connected to a first hydraulic cylinder, the output end of the first hydraulic cylinder is fixedly connected to a cutter, a dust suction mechanism is provided inside the box body, the dust suction mechanism includes a protection box, a motor, a first bevel gear, a vertical column, a second bevel gear, a threaded rod, a connecting rod, a first slider, a first slide groove, a short plate, a collection cover and a conduit, the bottom of the outer wall of the protection box is fixedly connected to the top of the outer wall of the box body, the inner wall of the protection box is fixedly connected to the motor, the output end of the motor passes through the top of the box body and is fixedly connected to the first bevel gear, the outer The outer wall of the gear train is fixedly connected to the first sliding block, and the outer wall of the gear train is fixedly connected to the first sliding block, and the first sliding block is slidably engaged with the inner wall of the cross plate through the first sliding groove. One end of the connecting rod is fixedly connected to the short plate, and the inner wall of the short plate is fixedly connected to a conduit, and one end of the conduit extends to the outside of the box, and the other end of the conduit is communicated with a collection cover.

[0007] Preferably, an adjustment mechanism is provided inside the box, and the adjustment mechanism includes a base, a second hydraulic cylinder, a push plate and a loading platform. The bottom of the outer wall of the base is fixedly connected to the inner wall of the box, the outer wall of the base is fixedly connected to the second hydraulic cylinder, the output end of the second hydraulic cylinder is fixedly connected to the push plate, the outer wall of the push plate is fixedly connected to the loading platform, and the bottom of the loading platform is attached to the inner wall of the box.

[0008] Preferably, a second sliding block is fixedly connected to the bottom of the loading platform, and the second sliding block is slidably engaged with the bottom of the inner wall of the box body through a second sliding groove.

[0009] Preferably, the four corners of the bottom of the box are fixedly connected with supporting feet, and ventilation holes are opened on both sides of the protection box.

[0010] Preferably, a limiting groove is provided on the surface of the loading platform. Beneficial effects

[0011] The utility model provides an autoclaved aerated concrete block bottom skin removal device. The device has the following beneficial effects: the autoclaved aerated concrete block bottom skin removal device collects dust generated when the bottom skin of the concrete block is removed through the coordination of a protective box, a motor, a first bevel gear, a vertical column, a second bevel gear, a threaded rod, a connecting rod, a first slider, a first chute, a short plate, a collection cover, and a conduit. This solves the problem that existing bottom skin removal devices generate a large amount of dust when removing the bottom skin of the concrete block, and the dust enters the air. When the operator breathes, the dust in the air may enter the operator's respiratory system, causing harm to the operator's respiratory system and affecting physical health.

[0012] Through the cooperation between the base, the second hydraulic cylinder, the push plate, the loading platform and the second slider, the autoclaved aerated concrete blocks with the bottom skin cut off are automatically transported to the outside of the equipment, making it convenient for subsequent staff to take them out. This solves the problem that after the bottom skin of the concrete block is cut off, the staff need to reach into the equipment to take out the concrete block, which will cause harm to the staff's hands when the cutter malfunctions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 for Figure 1 Schematic diagram of the appearance;

[0015] Figure 3 for Figure 1 Schematic diagram of the structure of the middle box, cross plate and first hydraulic cylinder;

[0016] Figure 4 for Figure 1 Schematic diagram of the structure of the middle motor, protection box and first bevel gear;

[0017] Figure 5 for Figure 1 Schematic diagram of the structure of the middle loading platform, the limit slot and the second slider;

[0018] Figure 6 for Figure 1 Schematic diagram of the structure of the middle connecting rod, the first slider and the first sliding groove.

[0019] In the figure: 1. Box body; 2. Horizontal plate; 3. First hydraulic cylinder; 4. Cutter; 5. Protective box; 6. Motor; 7. First bevel gear; 8. Vertical column; 9. Second bevel gear; 10. Threaded rod; 11. Connecting rod; 12. First slider; 13. First slide; 14. Short plate; 15. Collecting cover; 16. Conduit; 17. Base; 18. Second hydraulic cylinder; 19. Push plate; 20. Loading platform; 21. Second slider; 22. Limiting groove; 23. Second slide; 24. Support foot; 25. Ventilation port. DETAILED DESCRIPTION

[0020] 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 embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Existing bottom skin removal equipment will generate a lot of dust when removing the bottom skin of concrete blocks. This dust will enter the air. When the operator breathes, the dust in the air may enter the operator's respiratory system, causing harm to the operator's respiratory system and affecting his health.

[0022] In view of this, the utility model provides an autoclaved aerated concrete block bottom skin removal device, which realizes the collection of dust generated when the bottom skin of the concrete block is removed through the cooperation between the protective box, the motor, the first bevel gear, the vertical column, the second bevel gear, the threaded rod, the connecting rod, the first slider, the first slide groove, the short plate, the collection cover and the duct, and solves the problem that the existing bottom skin removal equipment will generate a large amount of dust when removing the bottom skin of the concrete block. The dust will enter the air, and when the operator breathes, the dust in the air may enter the operator's respiratory system, causing harm to the operator's respiratory system and affecting physical health.

[0023] By those skilled in the art, the components in this case are connected in sequence. For the specific connection and operation sequence, reference should be made to the following working principle. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process.

[0024] Example 1, by Figure 1-6It can be seen that an autoclaved aerated concrete block bottom skin removal device in this case includes a box body 1, the inner wall of the box body 1 is fixedly connected to a horizontal plate 2, the bottom of the horizontal plate 2 is fixedly connected to a first hydraulic cylinder 3, the model of the first hydraulic cylinder 3 is selected according to actual needs, and it can meet the work. The output end of the first hydraulic cylinder 3 is fixedly connected to a cutter 4, and the first hydraulic cylinder 3 is started. The first hydraulic cylinder 3 drives the cutter 4 to descend, and the cutter 4 cuts the bottom skin of the concrete block. A dust suction mechanism is provided inside the box body 1, and the dust suction mechanism includes a protective box 5, a motor 6, a first bevel gear 7, a vertical column 8, a second bevel gear 9, a threaded rod 10, a connecting rod 11, a first slider 12, a first slide 13, a short plate 14, a collection cover 15 and The guide tube 16, the bottom of the outer wall of the protection box 5 is fixedly connected to the top of the outer wall of the box body 1, the inner wall of the protection box 5 is fixedly connected with the motor 6, the motor 6 is fixed inside the protection box 5 through a protective sleeve, the protection box 5 is used to protect the motor 6 from external factors, to ensure the normal operation of the motor 6, the model of the motor 6 is selected according to actual needs, and the work is sufficient. The output end of the motor 6 passes through the top of the box body 1 and is fixedly connected with the first bevel gear 7. When the motor 6 is started, the motor 6 drives the first bevel gear 7 to rotate. The outer wall of the first bevel gear 7 is meshed with the second bevel gear 9 on both sides. The first bevel gear 7 drives the second bevel gears 9 on both sides to rotate. The inner wall of the second bevel gear 9 is fixedly connected with a threaded rod 10, and the second bevel gears on both sides are fixedly connected. The threaded rod 10 driven by the second bevel gear 9 rotates, and the end of the threaded rod 10 close to the second bevel gear 9 is rotatably connected to the vertical column 8 through a bearing. The vertical column 8 supports the threaded rod 10, and the outer wall of the vertical column 8 is fixedly connected to the inner wall of the box body 1. The other end of the threaded rod 10 away from the second bevel gear 9 is rotatably connected to the inner wall of the box body 1 through a bearing. The box body 1 also supports the threaded rod 10. The outer wall of the threaded rod 10 is threadedly connected to a connecting rod 11. The movement of the threaded rods 10 on both sides drives the connecting rod 11 to move. The connecting rod 11 passes through the outer wall of the cross plate 2. The outer wall of the connecting rod 11 is fixedly connected to the first slider 12, and the first slider 12 is slidably engaged with the inner wall of the cross plate 2 through the first slide groove 13. The connecting rods on both sides The movement of the connecting rod 11 drives the first sliding block 12 to slide in the first sliding groove 13. The end of the connecting rod 11 away from the threaded rod 10 is fixedly connected to the short plate 14. The connecting rod 11 drives the short plate 14 to move. The inner wall of the short plate 14 is fixedly connected to the guide tube 16. The short plate 14 drives the guide tube 16 to move. One end of the guide tube 16 extends to the outside of the box body 1. The part of the guide tube 16 outside the box body 1 is connected to the dust cleaner. The other end of the guide tube 16 is connected to the collection cover 15. The guide tube 16 drives the collection cover 15 to move. When dust collection is needed, the motor 6 is started, the collection cover 15 can be moved to a position closer to the concrete block, the external vacuum cleaner is started, and the collection cover 15 sucks the dust inside the box body 1 into the corresponding vacuum cleaner.

[0025] In the specific implementation process, it is worth pointing out that the model of the first hydraulic cylinder 3 is selected according to actual needs, and it can meet the work. Start the first hydraulic cylinder 3, the first hydraulic cylinder 3 drives the cutter 4 to descend, and the cutter 4 cuts off the bottom skin of the concrete block. The motor 6 is fixed inside the protective box 5 through a protective sleeve. The protective box 5 is used to protect the motor 6 from external factors to ensure the normal operation of the motor 6. The model of the motor 6 is selected according to actual needs, and it can meet the work. Start the motor 6, and the motor 6 drives the first bevel gear 7 to rotate. The first bevel gear 7 drives the second bevel gears 9 on both sides to rotate. The second bevel gears on both sides 9 drives the threaded rod 10 to rotate, the vertical column 8 supports the threaded rod 10, and the box body 1 also supports the threaded rod 10. The threaded rods 10 on both sides drive the connecting rod 11 to move, and the connecting rods 11 on both sides drive the first slider 12 to slide in the first slide groove 13. The connecting rod 11 drives the short plate 14 to move, and the short plate 14 drives the guide tube 16 to move, and the guide tube 16 drives the collection cover 15 to move. The part of the guide tube 16 outside the box body 1 is connected to the vacuum cleaner. When the external vacuum cleaner is started, the collection cover 15 sucks the dust inside the box body 1 into the vacuum cleaner, thereby timely absorbing a large amount of dust generated during the bottom skin removal process;

[0026] Furthermore, an adjustment mechanism is provided inside the box 1, which includes a base 17, a second hydraulic cylinder 18, a push plate 19 and a loading platform 20. The bottom of the outer wall of the base 17 is fixedly connected to the inner wall of the box 1, and the outer wall of the base 17 is fixedly connected to the second hydraulic cylinder 18. The model of the second hydraulic cylinder 18 is selected according to actual needs and can meet the work requirements. The base 17 supports the second hydraulic cylinder 18. The output end of the second hydraulic cylinder 18 is fixedly connected to the push plate 19. When the second hydraulic cylinder 18 is started, the second hydraulic cylinder 18 drives the push plate 19 to move, and the outer wall of the push plate 19 is fixedly connected to the loading platform 20. The platform 20 is moved by the push plate 19. The bottom of the platform 20 is attached to the inner wall of the box body 1. The platform 20 moves out of the box body 1 and the second hydraulic cylinder 18 is stopped. At this time, the operator puts the unprocessed concrete block on the platform 20. After the placement is completed, the second hydraulic cylinder 18 is started again. The second hydraulic cylinder 18 drives the platform 20 back to the inside of the box body 1 to remove the bottom skin of the concrete block. After the removal is completed, the second hydraulic cylinder 18 is started again. The second hydraulic cylinder 18 drives the platform 20 to move outward and sends the concrete block with the bottom skin removed out of the box body 1;

[0027] During the specific implementation process, it is worth noting that the model of the second hydraulic cylinder 18 is selected according to actual needs and can meet the work requirements. The base 17 supports the second hydraulic cylinder 18. When the second hydraulic cylinder 18 is started, the second hydraulic cylinder 18 drives the push plate 19 to move, and the push plate 19 drives the loading platform 20 to move. The loading platform 20 moves out of the box body 1 and stops the second hydraulic cylinder 18. At this time, the operator puts the unprocessed concrete block on the loading platform 20. After the placement is completed, the second hydraulic cylinder 18 is started again. The second hydraulic cylinder 18 drives the loading platform 20 back to the inside of the box body 1 to remove the bottom skin of the concrete block. After the removal is completed, the second hydraulic cylinder 18 is started again. The second hydraulic cylinder 18 drives the loading platform 20 to move outward and sends the concrete block with the bottom skin removed out of the box body 1, realizing that the equipment automatically sends out the concrete block with the bottom skin removed.

[0028] Furthermore, a second slider 21 is fixedly connected to the bottom of the loading platform 20, and the second slider 21 is slidably engaged with the bottom of the inner wall of the box body 1 through a second sliding groove 23;

[0029] In the specific implementation process, it is worth noting that the second slider 21 drives the loading platform 20 to move in the second sliding groove 23, thereby limiting the loading platform 20;

[0030] Specifically, start the first hydraulic cylinder 3, the first hydraulic cylinder 3 drives the cutter 4 to descend, and the cutter 4 cuts the bottom skin of the concrete block. The motor 6 is fixed inside the protection box 5 through a protective cover. The protection box 5 is used to protect the motor 6 from external factors and ensure the normal operation of the motor 6. Start the motor 6, and the motor 6 drives the first bevel gear 7 to rotate. The first bevel gear 7 drives the second bevel gear 9 on both sides to rotate. The second bevel gear 9 on both sides drives the threaded rod 10 to rotate. The vertical column 8 supports the threaded rod 10, and the box body 1 also supports the threaded rod 10. The threaded rod 10 on both sides drives the connecting rod 11 to move. The connecting rod 11 on both sides drives the first slider 12 to slide in the first slide groove 13. The connecting rod 11 drives the short plate 14 to move. The short plate 14 drives the conduit 16 to move. The conduit 16 drives the collection cover 15 to move. The part of the conduit 16 outside the box body 1 is connected to the vacuum cleaner. Start the external vacuum cleaner, and the collection cover 15 will move the dust inside the box body 1. The dust is sucked into the vacuum cleaner, which realizes timely absorption of a large amount of dust generated during the bottom skin removal process. The base 17 supports the second hydraulic cylinder 18, and the second hydraulic cylinder 18 is started. The second hydraulic cylinder 18 drives the push plate 19 to move, and the push plate 19 drives the loading platform 20 to move. The loading platform 20 moves out of the box body 1 and stops the second hydraulic cylinder 18. At this time, the operator puts the unprocessed concrete block on the loading platform 20. After placing it, the second hydraulic cylinder 18 is started again. The second hydraulic cylinder 18 drives the loading platform 20 back to the inside of the box body 1 to remove the bottom skin of the concrete block. After the removal is completed, the second hydraulic cylinder 18 is started again. The second hydraulic cylinder 18 drives the loading platform 20 to move outward and sends the concrete block with the bottom skin removed out of the box body 1, realizing automatic delivery of the concrete block with the bottom skin removed by the equipment, and the second slider 21 drives the loading platform 20 to move in the second slide groove 23, realizing the limitation of the loading platform 20.

[0031] Example 2, by Figure 1-5 It can be seen that the four corners of the bottom of the box body 1 are fixedly connected with support legs 24, which support the box body 1. Ventilation holes 25 are opened on both sides of the protective box 5. When the motor 6 generates heat when running, the ventilating holes 25 play a role in ventilation and heat dissipation of the motor 6.

[0032] In the specific implementation process, it is worth noting that the support legs 24 support the box body 1. When the motor 6 generates heat during operation, the vents 25 ventilate and dissipate heat for the motor 6, thereby improving the stability of the entire device.

[0033] Furthermore, a limiting groove 22 is provided on the surface of the loading platform 20, and the unprocessed concrete block is placed in the limiting groove 22 to prevent the concrete block from shifting in position when following the movement of the loading platform 20, resulting in the cutter 4 being unable to completely cut off the bottom skin of the concrete block;

[0034] During the specific implementation process, it is worth noting that the unprocessed concrete blocks are placed in the limiting grooves 22 to prevent the concrete blocks from shifting in position when following the movement of the stage 20, which would result in the cutter 4 being unable to completely remove the bottom skin of the concrete blocks, thereby improving the success rate of removing the bottom skin of the concrete blocks.

[0035] Specifically, the support legs 24 support the box body 1. When the motor 6 is running, heat is generated. The vents 25 ventilate and dissipate heat for the motor 6, thereby improving the stability of the entire device. The unprocessed concrete blocks are placed in the limit grooves 22 to prevent the concrete blocks from shifting in position when the stage 20 moves, causing the cutter 4 to be unable to completely cut off the bottom skin of the concrete blocks, thereby improving the success rate of cutting off the bottom skin of the concrete blocks.

[0036] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations. The phrase "includes an element defined by..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0037] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0038] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An autoclaved aerated concrete block bottom skin removal device, comprising a box (1), characterized in that: The inner wall of the box (1) is fixedly connected to a transverse plate (2), the bottom of the transverse plate (2) is fixedly connected to a first hydraulic cylinder (3), the output end of the first hydraulic cylinder (3) is fixedly connected to a cutter (4), and a dust collection mechanism is provided inside the box (1); The dust collection mechanism comprises a protection box (5), a motor (6), a first bevel gear (7), a vertical column (8), a second bevel gear (9), a threaded rod (10), a connecting rod (11), a first slider (12), a first chute (13), a short plate (14), a collection cover (15) and a conduit (16); The bottom of the outer wall of the protection box (5) is fixedly connected to the top of the outer wall of the box body (1); the inner wall of the protection box (5) is fixedly connected to a motor (6); the output end of the motor (6) passes through the top of the box body (1) and is fixedly connected to a first bevel gear (7); both sides of the outer wall of the first bevel gear (7) are meshedly connected to the second bevel gear (9); the inner wall of the second bevel gear (9) is fixedly connected to a threaded rod (10); one end of the threaded rod (10) close to the second bevel gear (9) is rotatably connected to a vertical column (8) through a bearing; the outer wall of the vertical column (8) is fixedly connected to the inner wall of the box body (1); one end of the threaded rod (10) away from the second bevel gear (9) is rotatably connected to the vertical column (8); the outer wall of the vertical column (8) is fixedly connected to the inner wall of the box body (1); The end is rotatably connected to the inner wall of the box body (1) through a bearing, the outer wall of the threaded rod (10) is threadedly connected to a connecting rod (11), the connecting rod (11) passes through the outer wall of the transverse plate (2), the outer wall of the connecting rod (11) is fixedly connected to a first slider (12), the first slider (12) is slidably engaged with the inner wall of the transverse plate (2) through a first slide groove (13), the end of the connecting rod (11) away from the threaded rod (10) is fixedly connected to a short plate (14), the inner wall of the short plate (14) is fixedly connected to a conduit (16), one end of the conduit (16) extends to the outside of the box body (1), and the other end of the conduit (16) is connected to a collection cover (15).

2. The autoclaved aerated concrete block bottom skin removal device according to claim 1, characterized in that: An adjustment mechanism is provided inside the box (1); The adjustment mechanism includes a base (17), a second hydraulic cylinder (18), a push plate (19) and a loading platform (20); The bottom of the outer wall of the base (17) is fixedly connected to the inner wall of the box (1), the outer wall of the base (17) is fixedly connected to a second hydraulic cylinder (18), the output end of the second hydraulic cylinder (18) is fixedly connected to a push plate (19), the outer wall of the push plate (19) is fixedly connected to a loading platform (20), and the bottom of the loading platform (20) is in contact with the inner wall of the box (1).

3. The autoclaved aerated concrete block bottom skin removal device according to claim 2, characterized in that: The bottom of the loading platform (20) is fixedly connected to a second sliding block (21), and the second sliding block (21) is slidably engaged with the bottom of the inner wall of the box body (1) through a second sliding groove (23).

4. The autoclaved aerated concrete block bottom skin removal device according to claim 1, characterized in that: The four corners of the bottom of the box body (1) are fixedly connected to support feet (24), and ventilation holes (25) are provided on both sides of the protection box (5).

5. The autoclaved aerated concrete block bottom skin removal device according to claim 2, characterized in that: A limiting groove (22) is provided on the surface of the loading platform (20).

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