Graded ridge pressing device

Abstract

The utility model belongs to the field of agricultural machinery, and particularly relates to a grading ridge pressing device which comprises a rack, a first ridge pressing assembly and a second ridge pressing assembly, the first ridge pressing assembly and the second ridge pressing assembly are sequentially arranged on the rack, a first driving part and a mounting frame are arranged on the rack, and the second ridge pressing assembly comprises two swing plates, a vibration shaft, an eccentric block, a hollow roller and a second driving part. According to the application, loose soil is firstly pressed into a preliminarily-compacted ridge shape, and then the preliminarily-compacted ridge shape is subjected to vibration compacting, so that the phenomenon that when the hollow roller vibrates to compact the ridge, the ridge shape is damaged due to vibration compacting is avoided; in the case that part of ridges pressed in the upward vibration lifting period is too loose, the ridges pressed by the ridge pressing device are all compact ridge structures, the lower limit of the strength of the pressed ridges is guaranteed through the first ridge pressing assembly, and the strength of the pressed ridges is improved on the basis of the lower limit of the strength of the pressed ridges through the second ridge pressing assembly.

Description

Technical Field

[0001] The present application belongs to the field of agricultural machinery, and specifically relates to a grading ridge pressing device. Technical Background

[0002] Land ridging is a traditional agricultural practice that improves soil structure and promotes crop growth by forming mounds of soil (ridges) above the ground and furrows (furrows) between ridges.

[0003] Ridging before planting improves soil temperature and moisture management, increases surface area, and enhances photosynthetic efficiency. It also combats drought and flooding, inhibits weed growth, facilitates mechanized harvesting, and improves crop yield and quality. Ridging improves soil quality, light, ventilation, photosynthetic efficiency, and fertilizer and water utilization.

[0004] Common ridging machines generally use the weight of the ridging device to passively press out ridges in the soil. This ridging method has the problem that the structure of the ridges pressed out is unstable, and the ridge structure is easily destroyed when subsequent operations are performed on the ridges, thereby affecting the function of the ridges.

[0005] In the prior art, there is a utility model patent with application number 202223328383.4, entitled "A Ridge Forming and Compacting Device." The patent provides a device that can actively compact ridges, which to some extent solves the problem of unstable and easily damaged ridge structures in the prior art. However, the following problems still exist:

[0006] When directly forming ridges on loose soil, the compacting roller that vibrates up and down will be in an upward position periodically for a period of time. When the compacting roller is lifted up, the part of the ridge pressed out will be very loose. The ridge pressed out when the compacting roller is lifted up is too prominent compared to the tight ridge when the compacting roller is pressed down, and this part of the ridge surface is easily damaged. Summary of the Invention

[0007] The purpose of this application is to address the technical problems in the prior art that when the pressure roller is lifted up, part of the ridge pressed out will be very loose, and the ridge pressed out when the pressure roller is lifted up will be too prominent compared to the compact ridge when the pressure roller is pressed down, and this part of the ridge surface will be easily damaged.

[0008] To achieve the above objectives, this application provides the following technical solutions:

[0009] A grading ridge pressing device comprising

[0010] A frame and a first ridge pressing assembly and a second ridge pressing assembly sequentially arranged on the frame, the frame is provided with a first driving member and a mounting frame, the first ridge pressing assembly is rotatably arranged on the frame, and is transmission-connected to the first driving member, the second ridge pressing assembly includes two swinging plates, a vibrating shaft, an eccentric block, a hollow roller and a second driving member, one end of the two swinging plates are respectively hinged to the two ends of the mounting frame, the vibrating shaft is rotatably arranged between the other ends of the two swinging plates, the eccentric block is arranged on the vibrating shaft, the hollow roller is rotatably sleeved on the vibrating shaft, the second driving member is arranged on the swinging plate, and is transmission-connected to the vibrating shaft.

[0011] Preferably, the first ridge pressing assembly includes a rotating shaft and an intermediate ridge forming roller. The rotating shaft is rotatably arranged on the frame and is transmission-connected to the first driving member. The intermediate ridge forming roller is arranged on the rotating shaft and is aligned with the hollow roller.

[0012] Preferably, the first ridging assembly further comprises two tapered rollers, the two tapered rollers being spaced apart at both ends of the middle ridging roller, and a furrow interval being present between the tapered roller and the end of the middle ridging roller.

[0013] Preferably, at least two ditching members are provided on the frame, and the two ditching members are arranged in alignment with the ridge gap and located on the side close to the forward direction of the frame.

[0014] Preferably, an anti-torsion bar is connected between the two swing plates.

[0015] Preferably, at least one damping spring is connected between the mounting bracket and the anti-torsion bar.

[0016] Preferably, it also includes a rotary tillage assembly arranged on the frame, the rotary tillage assembly includes a transmission member and two rotary tillage blade groups transmission-connected to both ends of the transmission member, one end of the rotary tillage blade group is arranged on the transmission member, and the other end is rotatably arranged on the frame.

[0017] Preferably, the transmission member is provided with a protective shovel, and the protective shovel is vertically arranged and faces the moving direction of the frame.

[0018] Preferably, a scraper plate is further provided on the frame, and the scraper plate is located between the rotary tillage assembly and the first ridge pressing assembly.

[0019] The beneficial effects are as follows: In this application, the first ridging component first presses the loose soil into a preliminarily compacted ridged shape, avoiding the situation where some of the ridges pressed during upward vibration and lifting are too loose. Then, the second ridging component vibrates and compresses the preliminarily compacted ridged shape, avoiding the situation where the ridges pressed by this application are all relatively compact ridged structures when the hollow roller vibrates to press the ridges. The first ridging component ensures the lower limit of the strength of the pressed ridges, and the second ridging component improves the strength of the pressed ridges on this basis. Description of the Drawings

[0020] Figure 1 Is the axonometric drawing of the grading ridging device described in this application;

[0021] Figure 2 Is the right view of the grading ridging device described in this application;

[0022] Figure 3 Is the front view of the grading ridging device described in this application;

[0023] Figure 4 Is the left view of the structure of the grading ridging device described in this application;

[0024] Figure 5 Is the bottom view of the grading ridging device described in this application;

[0025] Figure 6 Is the sectional view of the second ridging component described in this application;

[0026] Figure 7 Is the perspective view of the grading ridging device described in this application;

[0027] In the figure: frame 100, first driving member 110, mounting frame 120, ditching member 130, shock-absorbing spring 140, soil scraping plate 150, first ridging component 200, rotating shaft 210, intermediate ridging roller 220, conical roller 230, second ridging component 300, swing plate 310, vibrating shaft 320, eccentric block 330, hollow roller 340, second driving member 350, torsion-resistant rod 360, rotary tillage component 400, transmission member 410, rotary tillage knife group 420, protective shovel 430. Detailed Implementation Modes

[0028] It should be noted that, without conflict, the embodiments and features in the embodiments of this application can be combined with each other. The following will further describe the technical solutions of this application in combination with the drawings of the embodiments of this application. This application is not limited to the following specific implementation modes.

[0029] It should be understood that the same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components. In the description of this application, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom" and the like indicating an orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0030] Please refer to Figures 1 to 7 In one embodiment of the present application, there is a grading ridge pressing device, comprising

[0031] The frame 100 and the first ridge pressing assembly 200 and the second ridge pressing assembly 300 are sequentially arranged on the frame 100. The first ridge pressing assembly 200 is used to initially gather the soil into a loose ridge shape. The first ridge pressing assembly 200 can be any existing ridge-forming tool. The second ridge pressing assembly 300 further vibrates and presses the loose ridge shape into a compact ridge structure. The frame 100 is provided with a first driving member 110 and a mounting frame 120. The first driving member 110 is a reducer in this embodiment, which is used to connect the power output end of the tractor suspended by the frame 100 and transmit power to the first ridge pressing assembly Part 200, the first ridge pressing component 200 can be rotatably set on the frame 100. In this embodiment, the first ridge pressing component 200 can be a ridge pressing roller, and is connected to the first driving member 110 in transmission. In this embodiment, the ridge pressing roller and the first driving member 110 are driven by a pulley, and the pulley is wrapped by a protective shell to prevent field sand from entering. The second ridge pressing component 300 includes two swing plates 310, a vibrating shaft 320, an eccentric block 330, a hollow roller 340 and a second driving member 350. One end of the two swing plates 310 is respectively hinged to the two ends of the mounting frame 120, that is, Figure 4In the articulated manner shown, a vibration shaft 320 is rotatably provided between the other ends of the two swing plates 310. The eccentric block 330 is provided on the vibration shaft 320. When the eccentric block 330 rotates and turns downward, that is, when the eccentric block 330 is deflected to a position below the plane of the vibration shaft 320 by half a turn, a downward centrifugal force is generated, causing the vibration shaft 320 and the hollow roller 340 to gradually vibrate downward. Conversely, when the eccentric block 330 rotates upward, that is, when the eccentric block 330 is deflected to a position above the plane of the vibration shaft 320 by half a turn, the centrifugal force gradually lifts the vibration shaft 320 and the hollow roller 340 upward. The hollow roller 340 is rotatably sleeved on the vibration shaft 320, which can be sleeved through a bearing fit of a bearing ring and a ball provided on the hollow roller 340 and the vibration shaft 320, or other sleeved fit methods. The second driving member 350 is provided on the swing plate 310 and is in transmission connection with the vibration shaft 320.

[0032] In a specific implementation process, first, the field land is plowed into loose soil. The frame 100 is suspended on a tractor and is driven by the tractor to travel in the field. The first driving member 110 is in transmission connection with the power output end of the tractor, and then the power is transmitted to the first ridging component 200, causing the first ridging component 200 to press out a preliminarily compacted ridged shape from the loose soil. Immediately afterwards, the hollow roller 340 provided corresponding to the first ridging component 200 presses over the preliminarily compacted ridged shape. During the operation of the hollow roller 340, the second driving member 350 drives the vibration shaft 320 to rotate. At this time, the eccentric block 330 provided on the vibration shaft 320 generates a periodically up-and-down vibration force, and the vibration shaft 320 starts to vibrate up and down. When the vibration shaft 320 vibrates up and down, the hollow roller 340 vibrates up and down together. And because the hollow roller 340 and the vibration shaft 320 are rotatably connected through a bearing, the hollow roller 340 does not rotate with the vibration shaft 320, but is passively rotated and ridged by the friction force of the soil surface. The above working process of the hollow roller 340 and the eccentric block 330 combines to achieve the effect of continuously vibrating and compacting on the preliminarily compacted ridged shape, pressing out a compacted ridged surface one by one on the preliminarily compacted ridged shape. Compared with the prior art of directly vibrating and compacting the loose soil up and down, in this application, the loose soil is first pressed into a preliminarily compacted ridged shape, and then the preliminarily compacted ridged shape is vibrated and compacted, avoiding the situation that some of the ridged shapes pressed out during the upward vibration and lifting period are too loose when the hollow roller 340 vibrates and compacts the ridged land. The ridged land pressed out in this application is a relatively compact ridged land structure. The first ridging component 200 ensures the lower limit of the strength of the pressed-out ridged land, and the second ridging component 300 improves the strength of the pressed-out ridged land on this basis.

[0033] Beneficial effects: In this application, the loose soil is first pressed into a preliminarily compacted ridge shape, and then the preliminarily compacted ridge shape is subjected to vibratory compaction, avoiding the situation where some of the ridges pressed during the upward vibration and lifting period are too loose when the hollow roller 340 vibrates and presses the ground ridges. The ridges pressed by this application all have a relatively compact ridge structure. The first ridge pressing component 200 ensures the lower limit of the strength of the pressed ridges, and the second ridge pressing component 300 improves the strength of the pressed ridges on this basis.

[0034] In the above process, if there is a misalignment between the first ridge pressing component 200 and the second ridge pressing component 300, it will cause the strengths of the two sides of the ridge vibrated and pressed by the second ridge pressing component 300 to be asymmetric, resulting in one side of the pressed ridge being too compact and the air permeability becoming weak, and the other side being too loose, and the ridge structure strength on this side being too weak. In a possible embodiment, the first ridge pressing component 200 includes a rotating shaft 210 and an intermediate ridging roller 220. The intermediate ridging roller 220 is a hollow cylindrical roller, and both ends of the cylindrical roller are tapered and extend outward with openings. The rotating shaft 210 is rotatably arranged on the frame 100 and is in transmission connection with the first driving member 110. The preferred transmission mode between the first driving member 110 and the rotating shaft 210 is pulley transmission. Pulley transmission has better adaptability and can well adapt to the harsh environment of field operations. The intermediate ridging roller 220 is arranged on the rotating shaft 210. The intermediate ridging roller 220 can be fixed to the rotating shaft 210 or can be any one that is concentrically fitted to the rotating shaft 210 and is arranged in alignment with the hollow roller 340.

[0035] In a specific implementation process, due to the alignment between the intermediate ridging roller 220 and the hollow roller 340, the intermediate ridging roller 220 of this application first rotates to press out a relatively compact preliminary ridge shape, and then the hollow roller 340 aligns with the outer contour of the preliminary ridge shape. After the hollow roller 340 actively vibrates and compacts, the strength of the compacted ridge structure is symmetric, avoiding the above problems.

[0036] In the above process, on both sides of the ridge trench opened by the first ridge-forming component 200, only the inner side of the ridge trench close to the first ridge-forming component 200 is compacted, while the outer side is prone to collapse. The soil that collapses into the ridge trench will hinder the second ridge-forming component 300 from performing the vibrating ridge-forming operation. When the soil on the outer side of the ridge trench collapses, the soil that collapses on this side will lift the hollow roller 340 on this side when the hollow roller 340 vibrates, resulting in asymmetric strengths on both sides of the ridge formed by the vibrating ridge-forming of the second ridge-forming component 300. As a result, the inner side of the formed ridge is too compact and its air permeability becomes weak, while the outer side is too loose, and the structural strength of the outer side of the ridge is too weak. Only when the soil on the outer side collapses, it will also cause the force on the hollow roller 340 to be unbalanced, causing the connection of the hollow roller 340 to be subjected to torsion, resulting in a poor service life of the hollow roller 340. In a possible embodiment, the first ridge-forming component 200 further includes two tapered rollers 230, and the two tapered rollers 230 are arranged at intervals at both ends of the middle ridge-forming roller 220. There is a ridge trench interval between the tapered roller 230 and the end of the middle ridge-forming roller 220. The above arrangement enables the ridge trenches on both sides of the ridge formed by the first ridge-forming component 200 to be trapezoidal in reverse. The outer side of the ridge trench is stabilized by the tapered roller 230, thus avoiding the problems such as the unbalanced force on the hollow roller 340, the torsion on the connection of the hollow roller 340, and the poor service life of the hollow roller 340 caused by the collapse of the outer side of the ridge trench.

[0037] In the above process, if the ridge trench opened by the first ridge-forming component 200 collapses, the collapse of the ridge trench will cause excess soil to appear at the bottom of the ridge trench. The excess soil will hinder the second ridge-forming component 300 from performing the vibrating ridge-forming operation. For example, if there is excess soil on only one side of the ridge trench, the excess soil will lift the hollow roller 340 on this side when the hollow roller 340 vibrates, resulting in asymmetric strengths on both sides of the ridge formed by the vibrating ridge-forming of the second ridge-forming component 300. As a result, one side of the formed ridge is too compact and its air permeability becomes weak, while the other side is too loose, and the structural strength of the ridge on this side is too weak. Only the collapsed soil on one side will also cause the force on the hollow roller 340 to be unbalanced, causing the connection of the hollow roller 340 to be subjected to torsion, resulting in a poor service life of the hollow roller 340. In a possible embodiment, at least two trench-opening members 130 are provided on the frame 100. The two trench-opening members 130 are arranged opposite to each other in the ridge trench interval and are located on one side close to the advancing direction of the frame 100. The trench-opening members 130 push the soil in the ridge trench away to prevent excess soil from hindering the second ridge-forming component 300 from performing the vibrating ridge-forming operation.

[0038] In the above process, the problem of soil collapse in the ditch occurs as above. Only the ditch on one side of the hollow roller 340 has excess soil, which will also make the force on the hollow roller 340 unbalanced, and the connection of the hollow roller 340 is subjected to torsion, resulting in a shorter service life of the hollow roller 340. In a possible embodiment, an anti-torsion bar 360 is connected between the two swing plates 310. The function of the anti-torsion bar 360 is to make the two swing plates 310 swing up and down synchronously, so as to avoid the above-mentioned torsion being transmitted to the hinge of the swing plate 310, thereby reducing the life of the fragile hinge point. The above process significantly increases the service life of the hinge connection point of the swing plate 310.

[0039] In the above implementation process, the swing plate 310 swings up and down with the hollow roller 340, which will cause the anti-torsion bar 360 to be subjected to additional force, reducing the service life of the anti-torsion bar 360, and transmitting additional vibration force to the frame 100, which will damage the service life of the frame 100. Once the structure of the frame 100 resonates, the welding points of the frame 100 will be broken. In a possible embodiment, at least one shock-absorbing spring 140 is connected between the mounting frame 120 and the anti-torsion bar 360. When the swing plate 310 swings up and down, the potential energy of the swing plate 310 can be converted into the deformation of the shock-absorbing spring 140. The deformation of the shock-absorbing spring 140 will further buffer the swing of the swing plate 310, buffer the force that causes the potential energy of the swing plate 310 to change, and increase the service life of the anti-torsion bar 360 and the frame 100.

[0040] In the above implementation process, the soil needs to be plowed in advance, so it is necessary to install a rotary tillage mechanism on the frame 100. If a rotary tillage mechanism with unilateral transmission is set, the forces on both sides of the tilled soil will be uneven, and the strength on both sides will be asymmetric, which will to a certain extent lead to different degrees of crushing of the soil on both sides of the frame 100. In a possible embodiment, it also includes a rotary tillage assembly 400 arranged on the frame 100, and the rotary tillage assembly 400 includes a transmission member 410 and two rotary tillage blade groups 420 connected to both ends of the transmission member 410. One end of the rotary tillage blade group 420 is set on the transmission member 410, and the other end can be rotatably set on the frame 100. The above arrangement realizes the direct rotary tillage and soil crushing operations and ridge compaction operations through this application, and the two symmetrically arranged rotary tillage blade groups 420 can achieve consistent conditions on both sides of the tilled soil, provide symmetrical soil conditions for ridge formation, and further ensure the strength symmetry of the ridges pressed out by this application.

[0041] Furthermore, during the above implementation process, the transmission member 410 is located between the two rotary tillage assemblies 400, where the soil cannot be tilled and broken up, and the impact of the unbroken soil clods will damage the transmission member 410. The transmission member 410 is provided with a protective shovel 430, which is vertically arranged and faces the traveling direction of the frame 100. The setting of the protective shovel 430 not only protects the transmission member 410 from being impacted by the unbroken soil clods, but also tills the dead corner part between the two rotary tillage assemblies 400, achieving the tilling effect of the plow blade.

[0042] Furthermore, a soil scraping plate 150 is also arranged on the frame 100. The soil scraping plate 150 is located between the rotary tillage assembly 400 and the first ridging assembly 200. First, the loose soil to be ridged is scraped to an appropriate height for ridging, and then the ridging operation is carried out.

[0043] In a specific implementation process, the field land is first plowed into loose soil, the frame 100 is hung on the tractor and driven by the tractor to move in the field, the first driving member 110 is connected to the power output end of the tractor, and then the power is transmitted to the first ridge pressing component 200, so that the first ridge pressing component 200 presses the loose soil into a preliminary compacted ridge shape, the first ridge pressing component 200 also includes two tapered rollers 230, the two tapered rollers 230 are spaced apart at the two ends of the middle ridge forming roller 220, and the tapered rollers 230 and the end of the middle ridge forming roller 220 are spaced apart. There is a ridge gap, and the above arrangement realizes that the ridges on both sides of the ridge pressed by the first ridge pressing component 200 are inverted trapezoidal, wherein the conical roller 230 stabilizes the outer side of the ridge, and then the hollow roller 340 corresponding to the first ridge pressing component 200 presses the preliminary compacted ridge shape. During the operation of the hollow roller 340, the second driving member 350 drives the vibration shaft 320 to rotate. At this time, the eccentric block 330 set on the vibration shaft 320 generates a periodic up and down vibration force, and the vibration shaft 320 starts to vibrate up and down. When the vibration shaft 320 vibrates up and down, the hollow roller 340 vibrates up and down together. , and because the hollow roller 340 is rotatably connected to the vibration shaft 320 through a bearing, the hollow roller 340 does not rotate with the vibration shaft 320, but is passively rotated to press the ridge by the friction of the soil surface. When the swing plate 310 swings up and down, the potential energy of the swing plate 310 can be converted into the deformation of the shock-absorbing spring 140. The deformation of the shock-absorbing spring 140 will further buffer the force that causes the swing plate 310 to swing. The working process of the above-mentioned hollow roller 340 and the eccentric block 330 is combined to achieve the effect of continuous vibration and suppression on the initially compacted ridge shape. As a result, a compact ridge surface is pressed out one by one on the initially compacted ridge shape. Compared with the prior art that directly vibrates and suppresses the loose soil up and down, the present application first presses the loose soil into an initially compacted ridge shape, and then vibrates and suppresses the initially compacted ridge shape, thereby avoiding the situation where part of the ridge pressed out during the upward vibration lifting when the hollow roller 340 vibrates to press the ridge is too loose. The ridges pressed out by the present application are all relatively compact ridge structures. The first ridge pressing component 200 ensures the lower limit of the strength of the pressed ridges, and the second ridge pressing component 300 improves the strength of the pressed ridges on this basis.

[0044] Obviously, the above embodiments of the present application are merely examples for the purpose of clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, other variations or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A grading ridge pressing device, characterized in that: include A frame and a first ridge pressing assembly and a second ridge pressing assembly sequentially arranged on the frame, the frame is provided with a first driving member and a mounting frame, the first ridge pressing assembly is rotatably arranged on the frame, and is transmission-connected to the first driving member, the second ridge pressing assembly includes two swinging plates, a vibrating shaft, an eccentric block, a hollow roller and a second driving member, one end of the two swinging plates are respectively hinged to the two ends of the mounting frame, the vibrating shaft is rotatably arranged between the other ends of the two swinging plates, the eccentric block is arranged on the vibrating shaft, the hollow roller is rotatably sleeved on the vibrating shaft, the second driving member is arranged on the swinging plate, and is transmission-connected to the vibrating shaft.

2. The grading and ridge pressing device according to claim 1, characterized in that: The first ridge pressing assembly includes a rotating shaft and an intermediate ridge forming roller. The rotating shaft is rotatably arranged on the frame and is transmission-connected to the first driving member. The intermediate ridge forming roller is arranged on the rotating shaft and is aligned with the hollow roller.

3. The grading and ridge pressing device according to claim 2, characterized in that: The first ridge pressing assembly further comprises two tapered rollers, which are spaced apart at both ends of the middle ridge forming roller, and a furrow interval exists between the tapered roller and the end of the middle ridge forming roller.

4. The grading and ridge pressing device according to claim 3, characterized in that: At least two ditching members are provided on the frame, and the two ditching members are arranged in alignment with the ridge gap and are located on a side close to the forward direction of the frame.

5. The grading and ridge pressing device according to claim 1, characterized in that: An anti-torsion bar is connected between the two swing plates.

6. The grading and ridge pressing device according to claim 5, characterized in that: At least one damping spring is connected between the mounting bracket and the anti-torsion bar.

7. The grading and ridge pressing device according to claim 1, characterized in that: It also includes a rotary tillage assembly arranged on the frame, which includes a transmission member and two rotary tillage blade groups that are transmission-connected to both ends of the transmission member. One end of the rotary tillage blade group is arranged on the transmission member, and the other end is rotatably arranged on the frame.

8. The grading and ridge pressing device according to claim 7, characterized in that: The transmission member is provided with a protective shovel, and the protective shovel is vertically arranged and faces the walking direction of the frame.

9. The grading and ridge pressing device according to claim 7, characterized in that: The frame is also provided with a scraper plate, which is located between the rotary tillage assembly and the first ridge pressing assembly.

Images