Sowing device for livestock forage grass planting

Abstract

The invention relates to the technical field of seeding equipment, in particular to a livestock forage grass planting seeding device which comprises a vehicle body, a limiting cylinder is fixed to the top of the vehicle body, a discharging hopper is fixed to the top of the limiting cylinder, a discharging channel is formed in the bottom of the discharging hopper, a rotating disc is arranged in the limiting cylinder, and the bottom of the rotating disc is connected with a rotating mechanism and a lifting mechanism. A containing groove matched with the discharging channel is formed in the top of the rotary disc, the lower end of the discharging channel extends into the containing groove, a plurality of discharging holes distributed in the circumferential direction are formed in the lower end of the inner wall of the containing groove and penetrate through the outer wall of the rotary disc, and discharging windows distributed symmetrically are formed in the side wall of the discharging channel. Limiting mechanisms are arranged on the side faces of the discharging windows. The livestock grass seeding device effectively solves the problems of non-uniform grass seed distribution and uncontrollable landing position of a traditional broadcaster, is favorable for improving the emergence rate and the seedling uniformity, and finally realizes more efficient grassland planting.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of seeding equipment, and particularly relates to a seeding device for livestock grass planting. BACKGROUND

[0002] The seeding device for livestock grass planting mainly includes manual, traction and suspension types, and the core target is to accurately and efficiently seed the grass seeds into the soil. For small areas or complex terrains, a light and inexpensive hand-operated seed spreader is a common choice. The hand-operated seed spreader uniformly spreads the seeds laterally by centrifugal force generated by manual rotation, which is suitable for small areas or complex terrains. A large-scale traction seed spreader uses the power of a tractor to drive a high-speed disc for wide spreading, which has extremely high operating efficiency and can meet the rapid seeding needs of large-scale grasslands.

[0003] However, the traditional direct centrifugal throwing device has obvious defects. It simply relies on lateral centrifugal force for uncontrolled throwing, which leads to extremely uneven distribution of grass seeds on the ground. The landing direction and distance are completely random and uncontrollable, which easily forms over-seeding and under-seeding strips, and cannot achieve planned strip or area seeding, thereby seriously restricting the seeding quality and the production potential of the pasture. SUMMARY

[0004] The present application aims to provide a seeding device for livestock grass planting to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme. A seeding device for livestock grass planting, comprising a vehicle body, a limiting cylinder is fixed on the top of the vehicle body, a lower hopper is fixed on the top of the limiting cylinder, a lower discharging channel is arranged at the bottom of the lower hopper, a rotating disc is arranged in the limiting cylinder, the outer wall of the rotating disc is attached to the inner wall of the limiting cylinder, wherein a rotating mechanism and a lifting mechanism are connected to the bottom of the rotating disc, the lifting mechanism is used to drive the rotating disc to move up and down, and the rotating mechanism is used to drive the rotating disc to rotate, a containing groove is arranged on the top of the rotating disc and matched with the lower discharging channel, the lower end of the inner wall of the containing groove is provided with a plurality of discharging holes distributed in a circle, the discharging holes penetrate through the outer wall of the rotating disc, and a discharging window is arranged on the side wall of the lower discharging channel in a symmetrical manner, the side surface of the discharging window is provided with a limiting mechanism, the limiting mechanism is used to limit the grass seeds, so that the grass seeds can fall on different positions away from the vehicle body, a mounting bracket is mounted on the bottom of the vehicle body in a symmetrical manner, and walking wheels are rotatably connected to the mounting bracket through rotating shafts.

[0006] Preferably, the limiting mechanism includes a fixing block fixedly connected to the outer wall of the limiting cylinder. The fixing block has multiple baffles on the side away from the limiting cylinder. The multiple baffles are horizontally distributed, and the height of the bottom of the baffles gradually decreases from near the limiting cylinder to far away from the limiting cylinder. Each baffle has a rod fixed on its side wall. The multiple rods are distributed vertically. Each rod is inserted into the fixing block and slidably connected to the inner wall of the fixing block. The fixing block has a fixing component inside, which is used to fix the rods.

[0007] Preferably, the fixing component includes a plurality of threaded holes that pass through the insert rod and are evenly distributed, and the fixing block has a bolt that is adapted to the threaded holes passing through its interior.

[0008] Preferably, the lifting mechanism includes support plates symmetrically distributed below the turntable. The upper end of the support plates is connected to the turntable via a first limiting component, which limits the turntable so that it can rotate while moving up and down. Each support plate has a support rod fixed to its bottom, which passes through the vehicle body and is slidably connected to it. A push plate is fixed to the bottom of the support rod, and a spring is fixed to the top of the push plate. The upper end of the spring is fixedly connected to the bottom of the vehicle body. A symmetrically distributed cam that can compress the push plate is fixed to the outside of the rotating shaft.

[0009] Preferably, the first limiting component includes a locking block fixedly connected to the top of the support plate, and the bottom of the turntable is provided with a circular slot adapted to the locking block. The upper end of the locking block is located inside the circular slot and is slidably connected to the circular slot.

[0010] Preferably, the rotating mechanism includes a rotating rod fixedly connected to the bottom of the turntable, a transmission rod passing through the inside of the vehicle body, the transmission rod being rotatably connected to the vehicle body, the upper end of the transmission rod being connected to the lower end of the rotating rod through a second limiting component, the second limiting component being used to limit the rotating rod, so that the turntable can move up and down while rotating, a first bevel gear being fixed to the lower end of the transmission rod, and a second bevel gear being fixed to the outside of the rotating shaft, the second bevel gear meshing with the first bevel gear.

[0011] Preferably, the second limiting component includes a spline fixedly connected to the bottom of the rotating rod, wherein the top of the transmission rod is provided with a spline groove adapted to the spline, and the lower end of the spline extends into the spline groove and slides in connection with the inner wall of the spline groove.

[0012] Compared with existing technologies, the beneficial effects of this invention are as follows: This livestock grass sowing device achieves precise and controllable grass seed distribution through an innovative combination of centrifugal spreading and a limiting mechanism. The centrifugal force generated by the rotation of the turntable throws the grass seeds out of the discharge window. The height of the turntable is changed by the lifting mechanism, and the limiting mechanism ensures that the grass seeds can land precisely at different distances from the vehicle body, thereby achieving planned strip or area sowing. This effectively solves the problems of uneven grass seed distribution and uncontrollable landing position in traditional broadcasters, which helps to improve the germination rate and seedling uniformity, and ultimately achieves more efficient pasture establishment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present invention.

[0014] Figure 2 This is a schematic diagram of the internal structure of the limiting cylinder in an embodiment of the present invention.

[0015] Figure 3 This is a schematic diagram of the internal structure of the turntable in an embodiment of the present invention.

[0016] Figure 4 This is a schematic diagram of the baffle structure in an embodiment of the present invention.

[0017] Figure 5 This is a schematic diagram of the bottom structure of the vehicle body in an embodiment of the present invention.

[0018] In the diagram: 1-hopper, 2-limiting cylinder, 3-car body, 4-limiting mechanism, 41-fixing block, 42-bolt, 43-threaded hole, 44-insertion rod, 45-baffle, 5-lifting mechanism, 51-support plate, 52-support rod, 53-spring, 54-push plate, 55-cam, 56-block, 57-circular slot, 6-rotating mechanism, 61-first bevel gear, 62-second bevel gear, 63-transmission rod, 64-spline, 65-rotating rod, 7-mounting bracket, 8-walking wheel, 9-discharge window, 10-discharge channel, 11-turntable, 12-discharge hole, 13-holding trough, 14-rotating shaft. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0021] In one embodiment, see Figures 1-5A sowing device for livestock forage planting includes a vehicle body 3. A limiting cylinder 2 is fixed to the top of the vehicle body 3, and a feeding hopper 1 is fixed to the top of the limiting cylinder 2. A feeding channel 10 is provided at the bottom of the feeding hopper 1. A turntable 11 is provided inside the limiting cylinder 2, with the outer wall of the turntable 11 fitting against the inner wall of the limiting cylinder 2. A rotating mechanism 6 and a lifting mechanism 5 are connected to the bottom of the turntable 11. The lifting mechanism 5 drives the turntable 11 to move up and down, and the rotating mechanism 6 drives the turntable 11 to rotate. A holding trough 13 adapted to the feeding channel 10 is provided at the top of the turntable 11. The lower end of the 10 extends into the interior of the holding tank 13. The lower end of the inner wall of the holding tank 13 is provided with a plurality of discharge holes 12 arranged in a circular pattern. The discharge holes 12 penetrate the outer wall of the turntable 11. The side wall of the discharge channel 10 is provided with symmetrically distributed discharge windows 9. Each side of the discharge window 9 is provided with a limiting mechanism 4. The limiting mechanism 4 is used to limit the grass seeds, so that the grass seeds can fall at different positions from the vehicle body 3. The bottom of the vehicle body 3 is equipped with symmetrically distributed mounting frames 7. Each mounting frame 7 is rotatably connected to a traveling wheel 8. The traveling wheel 8 is connected through a rotating shaft 14.

[0022] In this embodiment, during sowing, grass seeds are poured into the hopper 1. The seeds enter the holding trough 13 inside the turntable 11 through the feeding channel 10. The vehicle 3 can then be manually pushed, or connected to an external mobile device. The external mobile device moves the vehicle 3, causing the wheels 8 to roll on the ground. The wheels 8 drive the rotating shaft 14 to rotate. Simultaneously, the rotating shaft 14 triggers the rotating mechanism 6 and the lifting mechanism 5. The rotating mechanism 6 drives the turntable 11 to rotate. During the rotation of the turntable 11, centrifugal force is generated, throwing the grass seeds from the holding trough 13 into the discharge hole 12. When the discharge hole 12 moves to the discharge window 9 position, it loses the obstruction of the limiting cylinder 2. Under the action of centrifugal force, the turntable 11 throws the grass seeds from the discharge hole 12 out of the discharge window 9, thus dispersing the grass seeds. The seeds are thrown to both sides of the vehicle body 3 to achieve the purpose of sowing. The side of the discharge window 9 is equipped with a limiting mechanism 4, which limits the distance of the seeds thrown out. In conjunction with the lifting mechanism 5, the seeds can land at different positions at different distances from the vehicle body 3. That is, this livestock grass sowing device achieves precise and controllable grass seed distribution through the innovative combination of centrifugal throwing and limiting mechanism 4. The centrifugal force generated by the rotation of the turntable 11 throws the grass seeds out of the discharge window 9. The lifting mechanism 5 changes the height of the turntable 11, and in conjunction with the limiting mechanism 4, the grass seeds can be accurately landed at different distances from the vehicle body 3. This enables planned strip or area sowing, effectively solving the problems of uneven grass seed distribution and uncontrollable landing position of traditional broadcasters. It is conducive to improving the germination rate and seedling uniformity, and ultimately achieving more efficient grassland establishment.

[0023] Please see Figure 4The limiting mechanism 4 includes a fixing block 41 fixedly connected to the outer wall of the limiting cylinder 2. The fixing block 41 is provided with multiple baffles 45 on the side away from the limiting cylinder 2. The multiple baffles 45 are horizontally distributed, and the height of the bottom of the baffles 45 gradually decreases from near the limiting cylinder 2 to away from the limiting cylinder 2. Insert rods 44 are fixed on the side wall of each baffle 45. The multiple insert rods 44 are distributed vertically. The insert rods 44 are all inserted into the interior of the fixing block 41 and slidably connected to the inner wall of the fixing block 41. The fixing block 41 is provided with a fixing component for fixing the insert rods 44.

[0024] During sowing, the device inserts the rods 44 on the side wall of the baffle 45 into the fixing block 41. After the rods 44 are inserted, the fixing components inside the fixing block 41 fix the rods 44, thereby ensuring the stability of the baffle 45. After the baffle 45 is fixed, multiple baffles 45 are horizontally distributed, and the height of the bottom of the baffles 45 gradually decreases from near the limiting cylinder 2 to far away from the limiting cylinder 2. Sowing can then be achieved by moving the vehicle body 3. During the movement of the vehicle body 3, the grass seeds are thrown out by the rotation of the turntable 11. After being thrown out, the grass seeds will hit the surface of one of the baffles 45 and fall down along the baffle 45. The baffle 45 limits the grass seeds, so that the grass seeds can fall in a specific position. The turntable 11 can also move up and down during the rotation. When the turntable 11 moves to a lower position, the grass seeds thrown out by the turntable 11 will hit the surface of the outermost baffle 45 and fall down along the outermost baffle 45. When the turntable 11 moves to the middle position, the grass seeds thrown out by the turntable 11 will hit the surface of the middle baffle 45 and fall down along the middle baffle 45. When the turntable 11 moves to a higher position, the grass seeds thrown out by the turntable 11 will hit the surface of the innermost baffle 45 and fall down along the innermost baffle 45. That is, by setting multiple baffles 45, the grass seeds can fall at different distances from the vehicle body 3, thereby realizing planned strip or area sowing. In order to avoid the splashing phenomenon caused by the grass seeds hitting the surface of the baffle 45, a layer of flexible buffer material, such as rubber or silicone pad, can be set on the surface of the baffle 45.

[0025] Please see Figure 4 The fixing component includes a plurality of threaded holes 43 that pass through the insert rod 44 and are evenly distributed, and the fixing block 41 has a bolt 42 that is adapted to the threaded holes 43 passing through its interior.

[0026] During sowing, the device inserts the rods 44 on the side wall of the baffle 45 into the fixing block 41. After the rods 44 are inserted, they are fixed by the cooperation of bolts 42 and threaded holes 43, thus ensuring the stability of the baffle 45. Each rod 44 is provided with multiple equally spaced threaded holes 43. The position of any baffle 45 can be adjusted by the multiple threaded holes 43, such as adjusting the distance between the baffle 45 and the limiting cylinder 2, or adjusting the distance between the baffles 45, so as to flexibly adapt to the agronomic requirements of different row spacing and sowing width, and realize the precision sowing of one machine for multiple uses. Furthermore, the setting of bolts 42 and threaded holes 43 also facilitates the disassembly of the baffle 45, thus facilitating the transportation of the device.

[0027] Please see Figure 3 and Figure 5 The lifting mechanism 5 includes a support plate 51 symmetrically distributed below the turntable 11. The upper end of the support plate 51 is connected to the turntable 11 through a first limiting component. The first limiting component is used to limit the turntable 11, so that the turntable 11 can rotate while moving up and down. Each support plate 51 has a support rod 52 fixed at its bottom. The support rod 52 passes through the vehicle body 3 and is slidably connected to the vehicle body 3. A push plate 54 is fixed at the bottom of the support rod 52. A spring 53 is fixed at the top of the push plate 54. The upper end of the spring 53 is fixedly connected to the bottom of the vehicle body 3. A cam 55 symmetrically distributed and capable of pressing the push plate 54 is fixed to the outside of the rotating shaft 14.

[0028] During sowing, the device can be manually pushed by the vehicle body 3 or moved by an external mobile device. The vehicle body 3 drives the traveling wheels 8 to roll on the ground, which in turn drives the rotating shaft 14 to rotate. The rotating shaft 14 rotates simultaneously with the rotating cam 55, which periodically squeezes the push plate 54. When the squeezing pressure of the cam 55 on the push plate 54 increases, the push plate 54 drives the turntable 11 to move upward through the support rod 52 and the support plate 51. When the squeezing pressure of the cam 55 on the push plate 54 decreases, the support plate 51 drives the turntable 11 to move downward under the action of the spring 53. This cycle allows the turntable 11 to move up and down continuously. In conjunction with the limiting mechanism 4, the grass seeds can fall at different positions from the vehicle body 3. The first limiting component can limit the turntable 11, allowing the turntable 11 to rotate while moving up and down.

[0029] Please see Figure 3 and Figure 5 The first limiting component includes a locking block 56 fixedly connected to the top of the support plate 51. The bottom of the turntable 11 is provided with a circular slot 57 adapted to the locking block 56. The upper end of the locking block 56 is located inside the circular slot 57 and is slidably connected to the circular slot 57.

[0030] As the support plate 51 moves up and down, it drives the turntable 11 to move up and down through the locking block 56. The locking block 56 can also slide inside the circular slot 57, so that the turntable 11 can rotate while moving up and down.

[0031] Please see Figure 3 and Figure 5 The rotating mechanism 6 includes a rotating rod 65 fixedly connected to the bottom of the turntable 11. A transmission rod 63 passes through the inside of the vehicle body 3 and is rotatably connected to the vehicle body 3. The upper end of the transmission rod 63 is connected to the lower end of the rotating rod 65 through a second limiting component. The second limiting component is used to limit the rotating rod 65, so that the turntable 11 can move up and down while rotating. A first bevel gear 61 is fixed to the lower end of the transmission rod 63, and a second bevel gear 62 is fixed to the outside of the rotating shaft 14. The second bevel gear 62 meshes with the first bevel gear 61.

[0032] During sowing, the device can be manually pushed by the vehicle body 3 or moved by an external mobile device. The vehicle body 3 drives the traveling wheels 8 to roll on the ground, which in turn drives the rotating shaft 14 to rotate. The rotating shaft 14 rotates simultaneously with the second bevel gear 62. The meshing of the first bevel gear 61 and the second bevel gear 62 drives the transmission rod 63 to rotate. The rotation of the transmission rod 63, in turn, drives the rotating rod 65 to rotate via the second limiting component. The rotating rod 65 drives the turntable 11 to rotate, thereby generating centrifugal force and throwing the grass seeds out of the discharge hole 12. The second limiting component can limit the rotation rod 65, allowing the turntable 11 to move up and down while rotating.

[0033] Please see Figure 3 and Figure 5 The second limiting component includes a spline 64 fixedly connected to the bottom of the rotating rod 65, wherein the top of the transmission rod 63 is provided with a spline groove adapted to the spline 64, and the lower end of the spline 64 extends into the spline groove and slides in connection with the inner wall of the spline groove.

[0034] While the transmission rod 63 rotates, it drives the rotating rod 65 to rotate through the cooperation of the spline groove and spline 64. The spline 64 can also move up and down inside the spline groove, so that the turntable 11 can move up and down while rotating.

[0035] Working principle: During sowing, grass seeds are poured into the hopper 1 and enter the holding trough 13 inside the turntable 11 through the feeding channel 10. The vehicle body 3 can then be moved manually or by an external mobile device. The vehicle body 3 drives the traveling wheels 8 to roll on the ground, which in turn drives the rotating shaft 14 to rotate. Simultaneously, the rotating shaft 14 drives the second bevel gear 62 and the cam 55 to rotate. The meshing of the first bevel gear 61 and the second bevel gear 62 drives the transmission rod 63 to rotate. The rotation of the transmission rod 63, in turn, drives the spline... The interaction between the groove and spline 64 drives the rotating rod 65 to rotate, which in turn drives the turntable 11 to rotate. During the rotation of the turntable 11, centrifugal force is generated, which throws the grass seeds inside the holding trough 13 into the discharge hole 12. When the discharge hole 12 moves to the discharge window 9 position, it is no longer blocked by the limiting cylinder 2. Under the action of centrifugal force, the turntable 11 throws the grass seeds inside the discharge hole 12 out of the discharge window 9, thus throwing the grass seeds towards both sides of the vehicle body 3, achieving the purpose of sowing. Simultaneously, the cam 55 rotates while periodically squeezing the push plate 54. When the pressure of the cam 55 on the push plate 54 increases, the push plate 54 drives the turntable 11 to move upward through the support rod 52 and the support plate 51. When the pressure of the cam 55 on the push plate 54 decreases, the support plate 51 drives the turntable 11 to move downward under the action of the spring 53. This cycle repeats, allowing the turntable 11 to move up and down continuously. When the turntable 11 moves to a lower position, the grass seeds thrown out by the turntable 11 will hit the surface of the outermost baffle 45 and fall down along the outermost baffle 45. When the turntable 11 moves to the middle position, the grass seeds thrown out by the turntable 11 will hit the surface of the outermost baffle 45 and fall down along the outermost baffle 45. The grass seeds will hit the surface of the middle baffle 45 and fall down along the middle baffle 45. When the turntable 11 moves to a higher position, the grass seeds thrown out by the turntable 11 will hit the surface of the innermost baffle 45 and fall down along the innermost baffle 45. That is, by setting multiple baffles 45, the grass seeds can land at different positions from the vehicle body 3, thereby realizing planned strip or area sowing. This effectively solves the problems of uneven grass seed distribution and uncontrollable landing position of traditional broadcasters, which is conducive to improving the germination rate and seedling uniformity, and ultimately achieving more efficient grassland establishment.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A seeding device for livestock forage planting, comprising a vehicle body; characterized in that, The vehicle body has a limiting cylinder fixed to its top, a hopper fixed to its top, and a feeding channel at the bottom of the hopper. A turntable is located inside the limiting cylinder, with its outer wall fitting against the inner wall of the limiting cylinder. A rotating mechanism and a lifting mechanism are connected to the bottom of the turntable. The lifting mechanism drives the turntable up and down, while the rotating mechanism drives it to rotate. A holding trough adapted to the feeding channel is located at the top of the turntable, with the lower end of the feeding channel extending into the holding trough. Multiple circumferentially distributed discharge holes are located at the lower end of the inner wall of the holding trough, penetrating the outer wall of the turntable. Symmetrically distributed discharge windows are located on the side wall of the feeding channel, each with a limiting mechanism on its side. These limiting mechanisms limit the grass seeds, allowing them to fall at different distances from the vehicle body. Symmetrically distributed mounting frames are installed at the bottom of the vehicle body, each frame rotatably connected to wheels via a rotating shaft.

2. The seeding device for livestock forage planting according to claim 1, characterized in that, The limiting mechanism includes a fixing block fixedly connected to the outer wall of the limiting cylinder. Multiple baffles are provided on the side of the fixing block away from the limiting cylinder. The multiple baffles are horizontally distributed, and the height of the bottom of the baffles gradually decreases from near the limiting cylinder to far away from the limiting cylinder. Insert rods are fixed on the side walls of the baffles. Multiple insert rods are distributed vertically. The insert rods are all inserted into the interior of the fixing block and slidably connected to the inner wall of the fixing block. A fixing component is provided inside the fixing block for fixing the insert rods.

3. The seeding device for livestock forage planting according to claim 2, characterized in that, The fixing component includes multiple threaded holes that pass through the insertion rod and are evenly distributed, and the fixing block has bolts that are adapted to the threaded holes passing through its interior.

4. The seeding device for livestock forage planting according to claim 1, characterized in that, The lifting mechanism includes support plates symmetrically distributed below the turntable. The upper end of the support plates is connected to the turntable via a first limiting component, which limits the turntable so that it can rotate while moving up and down. Each support plate has a support rod fixed to its bottom. The support rod passes through the vehicle body and is slidably connected to the vehicle body. A push plate is fixed to the bottom of the support rod, and a spring is fixed to the top of the push plate. The upper end of the spring is fixedly connected to the bottom of the vehicle body. A symmetrically distributed cam that can compress the push plate is fixed to the outside of the rotating shaft.

5. A seeding device for livestock forage planting according to claim 4, characterized in that, The first limiting component includes a locking block fixedly connected to the top of the support plate. The bottom of the turntable is provided with a circular slot that matches the locking block. The upper end of the locking block is located inside the circular slot and is slidably connected to the circular slot.

6. The seeding device for livestock forage planting according to claim 1, characterized in that, The rotating mechanism includes a rotating rod fixedly connected to the bottom of the turntable, a transmission rod passing through the inside of the vehicle body, the transmission rod being rotatably connected to the vehicle body, the upper end of the transmission rod being connected to the lower end of the rotating rod through a second limiting component, the second limiting component being used to limit the rotating rod, so that the turntable can move up and down while rotating, a first bevel gear being fixed to the lower end of the transmission rod, and a second bevel gear being fixed to the outside of the rotating shaft, the second bevel gear meshing with the first bevel gear.

7. A seeding device for livestock forage planting according to claim 6, characterized in that, The second limiting component includes a spline fixedly connected to the bottom of the rotating rod, wherein the top of the transmission rod is provided with a spline groove adapted to the spline, and the lower end of the spline extends into the spline groove and slides in connection with the inner wall of the spline groove.

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