A pre-embedded construction device for drainage pipes in soft soil layers during water conservancy construction

Abstract

This invention relates to the field of water conservancy construction technology, specifically to a pre-embedded construction device for drainage pipes in soft soil layers during water conservancy construction. It includes an excavator body and a connecting frame mounted on the top of the excavator body, with a support plate fixed to the connecting frame; and a guide plate fixed to the support plate. During use, the angle between the digging blades can be adjusted according to the required width of the excavated pit, thus broadening the device's applicability. During soil excavation, under the action of the conveying and transmission mechanisms, as the excavator body drives the digging blades forward, it provides power to the conveyor belt. The cut soil is guided from the bottom to the top of the pit through the square holes and the digging blades, and then falls to both sides of the pit under the guidance of the guide plate. Compared to traditional excavators, this method is more efficient. As the excavator body advances, the soil automatically falls to both sides of the pit, making subsequent backfilling more convenient.

Description

Technical Field

[0001] This invention relates to the field of water conservancy construction technology, specifically to a pre-embedded construction device for drainage pipes in soft soil layers during water conservancy construction. Background Technology

[0002] The traditional drainage pipe construction process is as follows: an excavator is used to dig the ground to form a pre-buried pit for burying the pipe, and then the pipe is placed in the pit for construction.

[0003] However, in practical applications, we have found that the width of the pit needs to be determined based on the diameter of the drainage pipe before excavating the pre-buried pit. Typically, we select a bucket with a width matching the pre-buried pit for excavation. However, the number of bucket models on the market is limited. If faced with excavation tasks involving pits of varying widths, choosing a bucket that is too wide may be unsuitable, while choosing a bucket that is too narrow may lead to low efficiency.

[0004] During excavation, the excavator's boom moves in an arc, using the bucket to excavate relatively flat ground. Then, the upper part of the excavator needs to be rotated to move the bucket outside the pre-buried pit, and the soil is dumped in the opposite direction. Subsequently, the upper part of the excavator is rotated again to bring the bucket to the same level as the pre-buried pit. This entire process is a single excavation operation, which needs to be repeated in actual construction, resulting in relatively low efficiency.

[0005] Furthermore, the excavated soil needs to be refilled after the pipeline is laid. Traditional excavators can only dump soil as close as possible to the edge of the pre-buried pit, which is not only labor-intensive but also ineffective. Therefore, we propose a novel pre-buried construction device for drainage pipes in soft soil layers for hydraulic engineering projects, aiming to solve the above problems and improve construction efficiency. Summary of the Invention

[0006] One of the technical problems to be solved by this application is: to design a drainage pipe pre-embedding construction device that is efficient in excavating pre-embedding pits and easy to backfill later.

[0007] To solve the above-mentioned technical problems, this application provides a construction device for pre-embedding drainage pipes in soft soil layers for water conservancy construction, including an excavator body and a connecting frame, wherein the connecting frame is installed on the top of the excavator body and a support plate is fixed on the connecting frame;

[0008] Guide plate, the guide plate being fixed to the support plate;

[0009] The hole-digging blade consists of two pieces connected by a rotating shaft. It is located below the guide plate and fixed to the guide plate. The two hole-digging blades form an inclined V-shape when connected.

[0010] An angle adjustment mechanism is mounted on a support plate and connected to a guide plate. The angle adjustment mechanism is connected to the digging blades through the guide plate, and the angle between the digging blades is adjusted by controlling the angle between the guide plates. By controlling the angle between the digging blades, the distance between the two digging blades on both sides is controlled.

[0011] Shaft 1, there are two shafts, each mounted on the hole-digging cutter, and each has a supplementary plate passing through it. The supplementary plate is triangular and is constrained to the hole-digging cutter by the shaft 1.

[0012] An angle supplement mechanism is installed on the hole-digging blade and connected to the supplement plate. The angle supplement mechanism enables the angle adjustment mechanism to adjust the angle between the hole-digging blades, and simultaneously drives the supplement plate to fill the gap at the bottom of the hole-digging blade, so that the bottom of the supplement plate is always in contact with the ground.

[0013] A conveying mechanism is mounted on the excavating cutter and connected to a guide plate. The conveying mechanism transports the excavated soil to the position of the guide plate.

[0014] The transmission mechanism is mounted on the digging blade and connected to the conveying mechanism. The transmission mechanism provides power to the conveying mechanism by the force of the digging blade being moved by the excavator body.

[0015] In some embodiments, the angle adjustment mechanism includes a motor mounted on a connecting frame, a screw mounted on the motor, a sleeve sleeved around the screw, the inner wall of the sleeve having a thread corresponding to the screw, a reinforcing plate fixed on the support plate, the sleeve penetrating the reinforcing plate, and a gap connection between the sleeve and the reinforcing plate. A fixing seat is mounted on both the sleeve and the guide plate, and a connecting rod is mounted between the fixing seats. A second shaft is installed through both ends of the connecting rod, and the second shaft penetrating the fixing seat.

[0016] In some embodiments, the corner supplementation mechanism includes a fixed rod mounted opposite to the digging cutter, the fixed rod being L-shaped, a groove being installed on the supplementation plate, a slider being installed in the groove, a connecting rod being installed on the slider, and a universal joint being installed between the connecting rod and the fixed rod.

[0017] In some embodiments, the conveying mechanism includes a groove 1 installed on a hole-digging cutter, the groove 1 extending from the top to the bottom of the hole-digging cutter. The hole-digging cutter has multiple square holes, all of which communicate with the groove 1. A roller 1 passes through the groove 1, and there are multiple roller 1 rollers, both ends of which are connected to the two sides of the groove 1. Fixing frames 1 are installed opposite each other on the two sides of the hole-digging cutter, and roller 2 rollers are installed on each of the fixing frames 1. A conveyor belt is sleeved on the outer wall of roller 1 and roller 2 rollers, and push plates are provided on the conveyor belt, and there are multiple push plates.

[0018] In some embodiments, the transmission mechanism includes a second fixed frame installed on both sides of the digging cutter, a third shaft installed through each of the second fixed frames, a wheel sleeved on each of the third shafts, a first bevel gear installed on the third shaft, and a second bevel gear installed at one end of the second roller, the second bevel gear meshing with the first bevel gear.

[0019] In some embodiments, the diameter of the first bevel gear is larger than that of the second bevel gear.

[0020] In some embodiments, a sealing plate is installed between the guide plate and the digging blade.

[0021] In some embodiments, the conveyor belt and push plate are both made of metal.

[0022] In some embodiments, the guide plate is inclined and has an arc.

[0023] In some embodiments, a protective cover is fixed to the support plate, and the protective cover has the same shape as the connected digging blade.

[0024] The present invention has at least the following beneficial effects: When using this device, workers can flexibly adjust the angle between the digging blades according to the actual width of the trench to be excavated. This design makes the device more widely applicable, adaptable to the pre-embedding construction needs of drainage pipes of different specifications and sizes, thereby improving the practicality and work efficiency of the device.

[0025] During the excavation process, the conveying and transmission mechanisms play a crucial role. As the excavator moves, the cutting blade cuts the soil while simultaneously providing continuous power to the conveyor belt via the transmission mechanism. Guided by the square holes and the cutting blade, the cut soil is transported from the bottom to the top of the pit. Subsequently, with the ingenious action of the guide plates, the soil is smoothly guided to both sides of the pit. In this process, the soil can automatically and efficiently fall to both sides of the pit. Compared to traditional excavator construction methods, this not only greatly improves excavation efficiency but also reduces the tediousness and labor intensity of manual operation.

[0026] Furthermore, as the excavator advances, soil is continuously and evenly piled up on both sides of the tunnel. This automatic soil-dropping method greatly facilitates subsequent backfilling work, reduces the amount of re-moving and filling work, and further improves construction efficiency.

[0027] In summary, this water conservancy construction soft soil layer drainage pipe pre-embedding construction device, through flexible angle adjustment, efficient conveying and transmission mechanisms, and automatic soil dropping design, achieves efficient, convenient, and automated drainage pipe pre-embedding construction, providing strong technical support for water conservancy project construction. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a side view of the structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the back structure of the hole-digging blade of the present invention;

[0031] Figure 4 For the present invention Figure 3 Schematic diagram of the structure at point A in the middle;

[0032] Figure 5 This is a schematic diagram of the corner supplementary mechanism structure of the present invention;

[0033] Figure 6 For the present invention Figure 5 Schematic diagram of the structure at point B;

[0034] Figure 7 For the present invention Figure 6 A partial structural diagram from another perspective;

[0035] Figure 8 This is a schematic diagram of a partial cross-sectional structure of the present invention;

[0036] Figure 9 For the present invention Figure 8 Schematic diagram of the structure at point C;

[0037] Figure 10 This is a front view structural diagram of the hole-digging blade of the present invention.

[0038] In the diagram: 1-Excavator body; 2-Connecting frame; 21-Support plate; 22-Protective cover; 3-Guide plate; 30-Sealing plate; 4-Digging blade; 5-Angle adjustment mechanism; 51-Motor; 52-Screw; 53-Sleeve; 54-Reinforcing plate; 55-Fixed seat; 56-Connecting rod; 57-Shaft 2; 6-Shaft 1; 61-Supplementary plate; 7-Angle supplementary mechanism; 71-Fixed rod; 72-Slide groove; 73-Slider; 74-Connecting rod; 75-Universal joint; 8-Conveying mechanism; 81-Groove 1; 82-Square hole; 83-Roller 1; 84-Fixed frame 1; 85-Roller 2; 86-Conveyor belt; 87-Push plate; 9-Transmission mechanism; 91-Fixed frame 2; 92-Shaft 3; 93-Wheel; 94-Bevel gear 1; 95-Bevel gear 2. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1, please refer to Figure 1-10 The present invention provides a technical solution: a construction device for pre-embedding drainage pipes in soft soil layers during water conservancy construction, comprising an excavator body 1, and further comprising:

[0041] Connecting frame 2 is installed on the top of excavator body 1, and a support plate 21 is fixed on the connecting frame 2;

[0042] Guide plate 3, guide plate 3 is fixed on support plate 21;

[0043] The hole-digging blade 4 consists of two pieces connected by a rotating shaft. It is located below the guide plate 3 and fixed to the guide plate 3. The two hole-digging blades 4 are connected to form an inclined V-shape.

[0044] Referring to the accompanying drawings, this shape and structure make it easier for the excavated soil to slide to the sides during the movement of the digging blade 4.

[0045] Angle adjustment mechanism 5 is installed on support plate 21 and connected to guide plate 3. Angle adjustment mechanism 5 is connected to digging blade 4 through guide plate 3. The angle between digging blade 4 is achieved by adjusting the angle between guide plates 3. By controlling the angle between digging blade 4, the distance between the two sides of digging blade 4 is controlled.

[0046] Shaft 6, there are two shafts 6, which are respectively installed on the hole-digging cutter 4, and each has a supplementary plate 61 through it. The supplementary plate 61 is triangular and is restricted to the hole-digging cutter 4 by shaft 6.

[0047] Angle supplement mechanism 7 is installed on the hole digging blade 4 and connected to the supplement plate 61. When the angle adjustment mechanism 5 adjusts the angle between the hole digging blades 4, the angle supplement mechanism 7 simultaneously drives the supplement plate 61 to fill the gap at the bottom of the hole digging blade 4, so that the bottom end of the supplement plate 61 is always in contact with the ground.

[0048] The conveying mechanism 8 is installed on the digging cutter 4 and connected to the guide plate 3. The conveying mechanism 8 transports the excavated soil to the position of the guide plate 3.

[0049] The transmission mechanism 9 is mounted on the digging cutter 4 and connected to the conveying mechanism 8. The transmission mechanism 9 provides power to the conveying mechanism 8 by the force of the excavator body 1 driving the digging cutter 4 to move.

[0050] The angle adjustment mechanism 5 includes a motor 51 mounted on the connecting frame 2, a screw 52 mounted on the motor 51, a sleeve 53 sleeved around the screw 52, ​​and a thread corresponding to the screw 52 on the inner wall of the sleeve 53. A reinforcing plate 54 is fixed on the support plate 21, and the sleeve 53 passes through the reinforcing plate 54. The sleeve 53 and the reinforcing plate 54 are connected by a gap. A fixing seat 55 is mounted on both the sleeve 53 and the guide plate 3. A connecting rod 56 is mounted between the fixing seats 55. A shaft 57 is mounted through both ends of the connecting rod 56, and the shaft 57 passes through the fixing seat 55.

[0051] Before digging the tunnel, the diameter of the drainage pipe is measured, and then the width of the tunnel to be dug is determined. Then, the shaft 6 between the digging cutters 4 is aligned with the center of the tunnel. The motor 51 is turned on, and the motor 51 drives the screw 52 to rotate. The rotation of the screw 52 drives the sleeve 53 to move. During the movement of the sleeve 53, the connecting rod 56 is driven to increase or decrease the angle between the guide plates 3. The digging cutters 4 fixed to the guide plates 3 move synchronously, thereby adjusting the angle between the digging cutters 4.

[0052] The corner supplement mechanism 7 includes a fixed rod 71 mounted on the digging cutter 4. The fixed rod 71 is L-shaped. A sliding groove 72 is installed on the supplement plate 61. A slider 73 is installed in the sliding groove 72. A connecting rod 74 is installed on the slider 73. A universal joint 75 is installed between the connecting rod 74 and the fixed rod 71.

[0053] Because shaft 6 is inclined, a gap will appear at the bottom of the hole-digging cutter 4 during the angle adjustment process. To address this, when the hole-digging cutter 4 rotates, the fixed rod 71 and the connecting rod 74 move synchronously, one rotating to the upper left and the other to the upper right, but always at the same height. That is, only the distance between them will change. When the angle is increased, the distance becomes farther, and when the angle is decreased, the distance becomes closer. As the angle increases, the fixed rod 71 drives the slider 73 to slide in the slide groove 72 through the universal joint 75 and the connecting rod 74, causing one end of the supplement plate 61 to rise. Under the action of shaft 6, the other end falls accordingly to fill the gap.

[0054] The conveying mechanism 8 includes a groove 81 installed on the hole-digging cutter 4, which extends from the top to the bottom of the hole-digging cutter 4. The hole-digging cutter 4 has multiple square holes 82, all of which are connected to the groove 81. A roller 83 passes through the groove 81, and there are multiple rollers 83, with both ends connected to the two sides of the groove 81. Fixing frames 84 are installed opposite each other on both sides of the hole-digging cutter 4, and rollers 85 are installed on each fixing frame 84. A conveyor belt 86 is sleeved on the outer wall of the rollers 83 and rollers 85, and push plates 87 are provided on the conveyor belt 86, with multiple push plates 87.

[0055] When the roller 85 rotates, the entire conveyor belt 86 rotates, and the push plate 87 also rotates with the conveyor belt 86, so that the soil entering the conveyor belt 86 through the square hole 82 is transported to the top. Due to the obstruction of the guide plate 3, the soil in the conveyor belt 86 moves in one direction and slides down the guide plate 3 to both sides of the tunnel, which facilitates the subsequent landfill work.

[0056] The transmission mechanism 9 includes a second fixed frame 91 installed on both sides of the digging cutter 4. A third shaft 92 is installed through the second fixed frame 91. A wheel 93 is sleeved on the third shaft 92. A first bevel gear 94 is installed on the third shaft 92. A second bevel gear 95 is installed at one end of the second roller 85. The second bevel gear 95 meshes with the first bevel gear 94.

[0057] The diameter of bevel gear 1 (94) is larger than that of bevel gear 2 (95).

[0058] Gear acceleration drives the conveyor belt to improve efficiency, thereby increasing overall efficiency.

[0059] While the excavator body 1 moves the digging cutter 4, the wheels 93 on both sides of the digging cutter 4 rotate synchronously close to the sides of the tunnel. The wheels 93 drive the shaft 92 to rotate, and the shaft 92 drives the roller 85 to rotate through the bevel gear 1 94 and bevel gear 2 95, providing driving force for the conveying mechanism 8.

[0060] A sealing plate 30 is installed between the guide plate 3 and the digging cutter 4.

[0061] To prevent large amounts of soil from passing through the gap between the guide plate 3 and the digging blade 4.

[0062] The working principle of this invention is as follows: Before digging the tunnel, the diameter of the drainage pipe is measured, and then the width of the tunnel to be dug is determined. Then, the shaft 6 between the digging cutters 4 is aligned with the center of the tunnel. The motor 51 is turned on, and the motor 51 drives the screw 52 to rotate. The rotation of the screw 52 drives the sleeve 53 to move. During the movement of the sleeve 53, the connecting rod 56 is driven to increase or decrease the angle between the guide plates 3, moving synchronously with the digging cutters 4 fixed to the guide plates 3, thereby adjusting the angle between the digging cutters 4. Because the shaft 6 is inclined, a gap will appear at the bottom of the digging cutter 4 during the angle adjustment process. To address this, when the digging cutter 4 rotates, the fixing rod 71 and the connecting rod 74 move synchronously, one rotating to the upper left and the other to the upper right, but always at the same height. That is, only the distance between them changes. When the angle is increased, the distance... As the distance increases and the angle decreases, the distance decreases. As the angle increases, the fixed rod 71 drives the slider 73 to slide in the groove 72 through the universal joint 75 and the connecting rod 74, causing one end of the supplement plate 61 to rise. Under the action of shaft 6, the other end falls to fill the gap. While the excavator body 1 drives the digging cutter 4 to move, the wheels 93 on both sides of the digging cutter 4 rotate synchronously close to both sides of the tunnel. The wheels 93 drive shaft 92 to rotate. Shaft 92 drives roller 85 to rotate through bevel gear 94 and bevel gear 95. When roller 85 rotates, the entire conveyor belt 86 rotates. The push plate 87 also rotates with the conveyor belt 86, so that the soil entering the conveyor belt 86 through the square hole 82 is transported to the top. Due to the obstruction of the guide plate 3, the soil in the conveyor belt 86 moves in one direction and slides down the guide plate 3 to both sides of the tunnel.

[0063] Example 2: Based on Example 1, this application further optimizes the solution as follows:

[0064] Both the conveyor belt 86 and the push plate 87 are made of metal.

[0065] It has a longer lifespan and is more stable during soil transport.

[0066] The guide plate 3 is inclined and has a curvature.

[0067] Using a snowplow commonly used on roads can provide better guidance.

[0068] A protective cover 22 is fixed on the support plate 21. The protective cover 22 has the same shape as the connected digging cutter 4.

[0069] On the one hand, it can protect the rotating shaft between the digging cutters 4, and on the other hand, the sharp tip can reduce the resistance encountered during digging.

[0070] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0071] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pre-embedded construction device for drainage pipes in soft soil layers during water conservancy construction, comprising an excavator body (1), characterized in that: Also includes: A connecting frame (2) is installed on the top of the excavator body (1), and a support plate (21) is fixed on the connecting frame (2). Guide plate (3), which is fixed on support plate (21); The hole-digging blade (4) consists of two pieces connected by a rotating shaft. It is located below the guide plate (3) and fixed to the guide plate (3). The two hole-digging blades (4) are connected in an inclined V-shape. Angle adjustment mechanism (5) is installed on the support plate (21) and connected to the guide plate (3). The angle adjustment mechanism (5) is connected to the digging blade (4) through the guide plate (3). The angle between the digging blades (4) is achieved by adjusting the angle between the guide plates (3). The distance between the two digging blades (4) is controlled by controlling the angle between the digging blades (4). Shaft 1 (6), there are two shafts (6), which are respectively installed on the hole-digging cutter (4) and are both penetrated by supplementary plates (61). The supplementary plates (61) are triangular and are restricted to the hole-digging cutter (4) by shaft 1 (6); Angle supplement mechanism (7) is installed on the hole-digging blade (4) and connected to the supplement plate (61). The angle supplement mechanism (7) causes the angle adjustment mechanism (5) to simultaneously drive the supplement plate (61) to fill the gap at the bottom of the hole-digging blade (4) when adjusting the angle between the hole-digging blades (4), so that the bottom end of the supplement plate (61) is always in contact with the ground. The conveying mechanism (8) is mounted on the digging cutter (4) and connected to the guide plate (3). The conveying mechanism (8) transports the excavated soil to the position of the guide plate (3). The transmission mechanism (9) is mounted on the digging cutter (4) and connected to the conveying mechanism (8). The transmission mechanism (9) provides power to the conveying mechanism (8) by the force of the excavator body (1) driving the digging cutter (4) to move.

2. The pre-embedded construction device for drainage pipes in soft soil layers during water conservancy construction according to claim 1, characterized in that: The angle adjustment mechanism (5) includes a motor (51) mounted on a connecting frame (2), a screw (52) mounted on the motor (51), a sleeve (53) sleeved on the screw (52), and a thread corresponding to the screw (52) on the inner wall of the sleeve (53). A reinforcing plate (54) is fixed on the support plate (21), and the sleeve (53) passes through the reinforcing plate (54). The sleeve (53) and the reinforcing plate (54) are connected by a gap. A fixed seat (55) is mounted on both the sleeve (53) and the guide plate (3). A connecting rod (56) is mounted between the fixed seats (55). A shaft (57) is installed through both ends of the connecting rod (56), and the shaft (57) passes through the fixed seat (55).

3. The pre-embedded construction device for drainage pipes in soft soil layers during water conservancy construction according to claim 2, characterized in that: The corner supplement mechanism (7) includes a fixed rod (71) mounted on the digging cutter (4), the fixed rod (71) being L-shaped, a groove (72) being installed on the supplement plate (61), a slider (73) being installed in the groove (72), a connecting rod (74) being installed on the slider (73), and a universal joint (75) being installed between the connecting rod (74) and the fixed rod (71).

4. The pre-embedded construction device for drainage pipes in soft soil layers during water conservancy construction according to claim 3, characterized in that: The conveying mechanism (8) includes a groove (81) installed on the hole-digging cutter (4), the groove (81) extending from the top to the bottom of the hole-digging cutter (4), the hole-digging cutter (4) having a square hole (82) with multiple square holes (82) connected to the groove (81), a roller (83) passing through the groove (81), multiple rollers (83) connected to both sides of the groove (81), a fixing frame (84) installed opposite to both sides of the hole-digging cutter (4), a roller (85) installed on each fixing frame (84), a conveyor belt (86) sleeved on the outer wall of the rollers (83) and rollers (85), and a push plate (87) provided on the conveyor belt (86), multiple push plates (87).

5. The pre-embedded construction device for drainage pipes in soft soil layers during water conservancy construction according to claim 4, characterized in that: The transmission mechanism (9) includes a second fixed frame (91) installed on both sides of the digging cutter (4). A third shaft (92) is installed through the second fixed frame (91). A wheel (93) is sleeved on the third shaft (92). A first bevel gear (94) is installed on the third shaft (92). A second bevel gear (95) is installed at one end of the second roller (85). The second bevel gear (95) meshes with the first bevel gear (94).

6. The pre-embedded construction device for drainage pipes in soft soil layers during water conservancy construction according to claim 5, characterized in that: The diameter of bevel gear one (94) is larger than that of bevel gear two (95).

7. The pre-embedded construction device for drainage pipes in soft soil layers during water conservancy construction according to claim 6, characterized in that: A sealing plate (30) is installed between the guide plate (3) and the digging cutter (4).

8. The pre-embedded construction device for drainage pipes in soft soil layers during water conservancy construction according to claim 7, characterized in that: Both the conveyor belt (86) and the push plate (87) are made of metal.

9. The pre-embedded construction device for drainage pipes in soft soil layers during water conservancy construction according to claim 8, characterized in that: The guide plate (3) is inclined and has an arc.

10. The pre-embedded construction device for drainage pipes in soft soil layers during water conservancy construction according to claim 9, characterized in that: A protective cover (22) is fixed on the support plate (21), and the protective cover (22) has the same shape as the connected grooving knife (4).

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