No-tillage seeding device with elastic press wheel

Abstract

The utility model discloses a no-tillage seeding device with an elastic press wheel. Comprising a rack, two first hinged supports fixedly connected to the rack, a first movable block hinged to the first hinged supports, a telescopic air bag fixedly connected to the lower end of the first movable block, an angle adjusting mechanism fixedly connected to the rack, an adjusting arm hinged to the angle adjusting mechanism and a connecting block fixedly connected to the upper end of the adjusting arm. The rotating column is rotatably mounted on the two adjusting arms in a penetrating manner; and the press wheel bodies are arranged on the peripheral wall of the rotating column. The utility model has the advantages that the buffering self-adaptive adjustability is good, the compacting operation is synchronous and stable, and the composite elastic structure of the compacting wheel body is better.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, specifically to a no-till seeding device with an elastic press wheel. Background Technology

[0002] As a key piece of equipment in conservation tillage, the performance of the compaction components of no-till seeders directly affects the quality of seedbed compaction and the uniformity of sowing. Existing compaction devices, in order to adapt to uneven field surfaces, often incorporate buffer elements such as springs between the compaction roller and the frame, and structurally attempt to add auxiliary compaction rollers to improve the compaction effect.

[0003] However, traditional helical springs or leaf springs have a fixed relationship between buffering force and deformation. When faced with complex and variable soil resistance and impact, they are difficult to achieve rapid and flexible adaptive adjustment, which may lead to delayed buffering response or large residual vibration. Secondly, some of the added auxiliary compaction wheels lack a stable and synchronous power linkage mechanism with the main compaction wheel. They mostly use follow-up or friction drive, which is prone to slippage or stalling when encountering weeds, straw entanglement, or uneven soil resistance. This results in asynchronous operation of the main and auxiliary compaction wheels, affecting the continuity and uniformity of ridge-side compaction. Furthermore, the structural design of the compaction wheel itself often focuses on a single characteristic, such as overall rigidity or surface elasticity. It lacks a composite elastic structure that can take into account radial support strength, circumferential deformation resistance, and surface flexibility and adhesion, thus limiting its comprehensive potential in reducing soil compaction damage, improving conformability, and extending its service life. Utility Model Content

[0004] The purpose of this invention is to provide a no-till seeding device with an elastic pressing wheel, which has the advantages of good buffering and adaptive adjustment, stable synchronous pressing operation, and better composite elastic structure of the pressing wheel body, thus solving the problems in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A no-till seeding device with elastic press wheels includes a frame, two first hinge seats fixed to the frame, a first movable block hinged to the first hinge seats, a telescopic airbag fixed to the lower end of the first movable block, an angle adjustment mechanism fixed to the frame, an adjustment arm hinged to the angle adjustment mechanism, a connecting block fixed to the upper end of the adjustment arm, a rotating column rotatably mounted through the two adjustment arms, and multiple press wheel bodies disposed on the outer peripheral wall of the rotating column.

[0007] The upper end of the connecting block is fixed to the lower end of the telescopic airbag;

[0008] An auxiliary pressing mechanism is hinged to the side wall of the adjusting arm. A driven gear mechanism is installed on the auxiliary pressing mechanism, and a driving gear mechanism is installed on the rotating column. The driving gear mechanism and the driven gear mechanism mesh with each other.

[0009] Preferably, the angle adjustment mechanism includes a second hinge fixed to the frame, a cylinder hinged to the second hinge, and a third hinge hinged to the cylinder output shaft, wherein the third hinge and the adjustment arm are hinged to each other.

[0010] It is worth noting that this angle adjustment mechanism, driven by a cylinder, can precisely control the pitch angle of the adjusting arm, thereby flexibly adjusting the contact pressure between the compaction wheel and the ground, as well as the working depth. This design allows the device to adapt to various uneven terrains and different soil hardness, ensuring a uniform compaction effect. The linear output of the cylinder provides stable power, rapid adjustment response, and simple operation, significantly improving the adaptability and operational efficiency of no-till seeding. In addition, the articulated connection reduces movement resistance and extends the service life of the mechanism.

[0011] Preferably, the auxiliary pressing mechanism includes a second movable block hinged to the adjusting arm and a small pressure roller rotatably mounted on the second movable block.

[0012] It is worth noting that the auxiliary compaction mechanism uses small rollers to additionally compact the soil on both sides, effectively compensating for any edge gaps that the main compaction roller may leave, and enhancing the overall compactness and uniformity of the compaction. The small rollers are hinged to the adjusting arm and move synchronously with the main compaction roller, ensuring the coordination of the compaction operation. This design not only increases the contact area between the seeds and the soil, promoting seed germination, but also reduces soil moisture evaporation, helping to conserve moisture. The introduction of the auxiliary compaction mechanism enhances the overall compaction capability of the device, making it suitable for the sowing needs of various crops. In addition, the flexible arrangement of the small rollers can adapt to ridge or furrow terrain, enhancing the practicality and versatility of the device, thereby optimizing the overall effect of no-till sowing.

[0013] Preferably, the driven gear mechanism includes a first fixed post fixed to the end of the small pressure roller away from the second movable block and a second gear fixed to the outer peripheral wall of the first fixed post, wherein the second movable block is arc-shaped.

[0014] It is worth noting that the driven gear mechanism includes a second gear, which meshes with the driving gear to reliably transmit power from the rotating column to the auxiliary pressing mechanism. The second gear is fixed to the small pressure roller, ensuring that the small pressure roller rotates synchronously with the rotating column and maintaining the coordination of the pressing operation. The arc-shaped second movable block design allows the small pressure roller to adapt to ground undulations within a certain range, enhancing the flexibility and adaptability of the mechanism. The gear transmission has high efficiency and a compact structure, reducing energy loss and improving the overall stability and durability of the device.

[0015] Preferably, the driving gear mechanism includes a second fixed column fixed to one end of the rotating column and a first gear fixed to the outer peripheral wall of the second fixed column, wherein the first gear and the second gear mesh with each other.

[0016] It is worth noting that the driving gear mechanism includes a first gear, which is fixed to the rotating column. Through gear meshing, it drives the driven gear mechanism, realizing the linkage between the main pressing wheel and the auxiliary pressing mechanism. This design ensures the synchronization of pressing operations and avoids the coordination problems caused by individual driving. The meshing torque of the first gear and the second gear is stable and the transmission ratio is fixed, so that the speed of the auxiliary pressing mechanism is consistent with that of the main pressing wheel, which enhances the consistency of pressing effect. In addition, the gear mechanism has a simple structure, is easy to maintain, and improves the reliability of the device.

[0017] Preferably, the ends of the two adjusting arms that are close to each other are fixedly connected to a reinforcing column.

[0018] It is worth noting that the reinforcing column connects the two adjusting arms, significantly enhancing their structural strength and overall rigidity. During compaction operations, the adjusting arms bear considerable vibration and load; the reinforcing column effectively prevents deformation or displacement of the adjusting arms, ensuring the stable working position of the compaction wheel. This design improves the device's durability and fatigue resistance, reduces component wear caused by vibration, and extends its service life. Simultaneously, the reinforcing column simplifies the structure, reduces manufacturing costs, and enhances the device's economic efficiency. It also improves load distribution, enabling more stable operation of the device in rugged terrain, thereby ensuring seeding accuracy and compaction quality.

[0019] Preferably, the pressing wheel body is composed of a stainless steel inner cylinder fixed to the outer peripheral wall of the rotating column, a magnesium steel alloy cylinder fixed to the outer peripheral wall of the stainless steel inner cylinder, a plurality of polyurethane elastic blocks fixed to the outer peripheral wall of the magnesium steel alloy cylinder, and a wear-resistant rubber cylinder fixed to one end of the plurality of polyurethane elastic blocks away from the stainless steel inner cylinder. The outer peripheral wall of the wear-resistant rubber cylinder is provided with a plurality of first grooves, and the polyurethane elastic blocks are arc-shaped.

[0020] It is worth noting that the compaction wheel adopts a multi-layer composite structure. The stainless steel inner cylinder provides high-strength support, the magnesium steel alloy cylinder enhances corrosion resistance, the polyurethane elastic block absorbs vibration and impact, reducing the transmission to the frame, the wear-resistant rubber cylinder increases ground adhesion, the groove improves soil breaking and compaction effects, the arc-shaped polyurethane elastic block gives the wheel excellent elasticity, can adapt to uneven ground, buffer operational impacts, protect seeds and soil structure, and the first groove of the wear-resistant rubber cylinder enhances soil gripping and breaking ability, promoting soil compaction.

[0021] Preferably, the press wheel body is composed of a wear-resistant steel inner cylinder fixed to the outer peripheral wall of the rotating column, a nickel-manganese alloy cylinder fixed to the outer peripheral wall of the wear-resistant steel inner cylinder, multiple spring steels fixed to the outer peripheral wall of the nickel-manganese alloy cylinder, and an aluminum alloy outer cylinder fixed to one end of the multiple spring steels away from the wear-resistant steel inner cylinder. The outer peripheral wall of the aluminum alloy outer cylinder is provided with multiple second grooves, and the spring steels are arc-shaped.

[0022] It is worth noting that the compaction wheel structure achieves a combination of lightweight and high elasticity. The wear-resistant steel inner cylinder ensures core strength, the nickel-manganese alloy cylinder provides toughness and impact resistance, and the arc-shaped spring steel gives the wheel elasticity, effectively buffering vibrations caused by uneven ground. The aluminum alloy outer cylinder is lightweight and wear-resistant, and the second groove enhances soil gripping and crushing capabilities. This design reduces the overall weight of the device and lowers power consumption. At the same time, the elastic deformation of the spring steel absorbs the impact during operation, protecting other components of the seeding device. The groove structure optimizes soil compaction and aeration, promoting seed germination.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] 1. This utility model replaces the traditional spring buffer element by placing a telescopic airbag between the frame and the adjusting arm. The telescopic airbag can be compressed and rebounded quickly and flexibly with the undulation of the ground. Its internal air pressure can adaptively adjust the support force, thereby providing nonlinear and responsive dynamic buffer for the pressing wheel. This setting effectively absorbs the impact and vibration during operation, allowing the pressing wheel to closely fit the uneven ground surface. It solves the problems of response lag and large residual vibration of traditional rigid or simple spring buffers, and significantly improves the uniformity of pressing operation and adaptability to the ground surface.

[0025] 2. This utility model employs a linkage system consisting of a driving gear mechanism on a rotating column and a driven gear mechanism on an auxiliary pressing mechanism. During operation, the rotational power of the main pressing wheel is directly and stably transmitted to the second gear via the rotating column and the first gear, driving the small pressing wheel to rotate synchronously. This rigid gear meshing transmission method avoids the slippage and stalling phenomena that easily occur with friction or follower-driven systems, ensuring that the main and auxiliary pressing units maintain precise speed synchronization under any working conditions. This achieves continuous and uniform coordinated pressing of the seedbed and the soil on both sides, solving the technical problem of asynchronous operation of the auxiliary pressing wheel.

[0026] 3. The two composite elastic structures of the compaction wheel bodies provided by this utility model achieve functional integration through the combination of multiple layers of materials from the inside out. The inner metal cylinder provides solid support, the arc-shaped polyurethane elastic block or spring steel in the middle layer gives the wheel body excellent radial elastic deformation capability, and the outer grooved wear-resistant material ensures grip and wear resistance. This structure enables the wheel body to have sufficient support strength while effectively buffering local impacts through the deformation of the middle elastic layer, reducing compaction damage to the soil. In addition, the outer groove helps to break up soil clods and improve compaction quality. This design comprehensively improves the wheel body's conforming ability, shock absorption performance and service life. Attached Figure Description

[0027] Figure 1 The diagram shown is a three-dimensional structural schematic of this utility model;

[0028] Figure 2 The diagram shown is a three-dimensional structural schematic of the angle adjustment mechanism of this utility model.

[0029] Figure 3 The diagram shown is a three-dimensional structural schematic of the rotating column of this utility model.

[0030] Figure 4 The diagram shown is a three-dimensional structural schematic of the first embodiment of the press wheel body of this utility model;

[0031] Figure 5 The diagram shown is a three-dimensional structural schematic of a second embodiment of the press wheel body of this utility model;

[0032] Figure 6 The diagram shown is a three-dimensional structural schematic of the auxiliary pressing mechanism of this utility model.

[0033] Reference numerals: 1. Frame; 2. First hinge; 3. First movable block; 4. Telescopic airbag; 5. Angle adjustment mechanism; 51. Second hinge; 52. Cylinder; 53. Third hinge; 6. Adjusting arm; 61. Reinforcing column; 7. Connecting block; 8. Rotating column; 9. Pressing wheel body; 91. Stainless steel inner cylinder; 92. Magnesium steel alloy cylinder; 93. Polyurethane elastic block; 94. Wear-resistant rubber cylinder; 95. First groove; 96. Wear-resistant steel inner cylinder; 97. Nickel-manganese alloy cylinder; 98. Spring steel; 99. Aluminum alloy outer cylinder; 910. Second groove; 10. First gear; 11. Second movable block; 12. Small pressure roller; 13. Second gear. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] To address the problems in existing technologies, such as the difficulty of rapid adaptive adjustment of traditional spring buffers, the tendency for slippage and asynchrony in the linkage of auxiliary pressure wheels, and the insufficient overall performance due to the simple structure of the pressure wheel body, the following technical solution is proposed. Please refer to [link / reference]. Figures 1-6 ;

[0036] A no-till seeding device with elastic press wheels includes a frame 1, two first hinge seats 2 fixed to the frame 1, a first movable block 3 hinged to the first hinge seats 2, a telescopic airbag 4 fixed to the lower end of the first movable block 3, an angle adjustment mechanism 5 fixed to the frame 1, an adjustment arm 6 hinged to the angle adjustment mechanism 5, a connecting block 7 fixed to the upper end of the adjustment arm 6, a rotating column 8 rotatably mounted through the two adjustment arms 6, and a plurality of press wheel bodies 9 disposed on the outer peripheral wall of the rotating column 8.

[0037] The upper end of the connecting block 7 is fixed to the lower end of the telescopic airbag 4;

[0038] An auxiliary pressing mechanism is hinged to the side wall of the adjusting arm 6. A driven gear mechanism is installed on the auxiliary pressing mechanism, and a driving gear mechanism is installed on the rotating column 8. The driving gear mechanism and the driven gear mechanism mesh with each other.

[0039] When in use, the angle adjustment mechanism 5 can be activated to adjust the position of the adjustment arm 6. When the pressing wheel 9 is working, the vibration will be absorbed by the telescopic airbag 4. In addition, the active gear mechanism and the driven gear mechanism mesh with each other to enable the auxiliary pressing mechanism to press the soil on both sides.

[0040] In this embodiment, specifically: the angle adjustment mechanism 5 includes a second hinge seat 51 fixed to the frame 1, a cylinder 52 hinged to the second hinge seat 51, and a third hinge seat 53 hinged to the output shaft of the cylinder 52. The third hinge seat 53 and the adjustment arm 6 are hinged to each other.

[0041] In this embodiment, specifically: the auxiliary pressing mechanism includes a second movable block 11 hinged to the adjusting arm 6 and a small pressure roller 12 rotatably mounted on the second movable block 11.

[0042] In this embodiment, specifically: the driven gear mechanism includes a first fixed post fixed to one end of the small pressure roller 12 away from the second movable block 11 and a second gear 13 fixed to the outer peripheral wall of the first fixed post, and the second movable block 11 is arc-shaped.

[0043] In this embodiment, specifically: the driving gear mechanism includes a second fixed column fixed to one end of the rotating column 8 and a first gear 10 fixed to the outer peripheral wall of the second fixed column, the first gear 10 and the second gear 13 meshing with each other.

[0044] In this embodiment, specifically: the two adjusting arms 6 are fixedly connected to a reinforcing column 61 at their close ends.

[0045] Example 1: In this example, specifically: the pressing wheel 9 is composed of a stainless steel inner cylinder 91 fixed to the outer peripheral wall of the rotating column 8, a magnesium steel alloy cylinder 92 fixed to the outer peripheral wall of the stainless steel inner cylinder 91, a plurality of polyurethane elastic blocks 93 fixed to the outer peripheral wall of the magnesium steel alloy cylinder 92, and a wear-resistant rubber cylinder 94 fixed to one end of the plurality of polyurethane elastic blocks 93 away from the stainless steel inner cylinder 91. The outer peripheral wall of the wear-resistant rubber cylinder 94 is provided with a plurality of first grooves 95, and the polyurethane elastic blocks 93 are arc-shaped.

[0046] The pressing wheel 9 structure provided in this embodiment has a high-strength rigid core composed of a stainless steel inner cylinder 91 and a magnesium steel alloy cylinder 92, which ensures overall support stability. Multiple arc-shaped polyurethane elastic blocks 93 serve as an intermediate elastic layer, which can undergo significant deformation under external force, effectively absorbing and buffering the impact and vibration during operation, and reducing the vibration transmitted to the frame 1. The outer wear-resistant rubber cylinder 94 and its first groove 95 enhance the adhesion to the soil and the ability to break through the soil, promoting the compaction of the seedbed. This composite structure significantly improves the overall elasticity and ground conformation ability while ensuring the strength of the wheel body, achieving a balance between pressing, shock absorption and wear resistance.

[0047] Example 2: In this example, specifically: the press wheel 9 is composed of a wear-resistant steel inner cylinder 96 fixed to the outer peripheral wall of the rotating column 8, a nickel-manganese alloy cylinder 97 fixed to the outer peripheral wall of the wear-resistant steel inner cylinder 96, a plurality of spring steels 98 fixed to the outer peripheral wall of the nickel-manganese alloy cylinder 97, and an aluminum alloy outer cylinder 99 fixed to one end of the plurality of spring steels 98 away from the wear-resistant steel inner cylinder 96. The outer peripheral wall of the aluminum alloy outer cylinder 99 is provided with a plurality of second grooves 910, and the spring steels 98 are arc-shaped.

[0048] The press wheel structure 9 provided in this embodiment adopts a combination of wear-resistant steel inner cylinder 96 and nickel-manganese alloy cylinder 97. While ensuring the core load-bearing strength, it improves toughness and fatigue resistance. The key lies in the application of multiple arc-shaped spring steels 98. Their excellent elastic mechanical properties give the wheel a strong radial buffering and rapid rebound capability, which can effectively cope with severe impacts. The aluminum alloy outer cylinder 99 realizes the lightweighting of the wheel and helps to reduce the overall operating energy consumption. The second groove 910 on its surface optimizes the soil gripping effect. This solution is particularly suitable for high-intensity and high-impact operating environments, providing excellent buffering performance while taking into account the requirements of lightweighting and durability.

[0049] Working principle: Before operation, according to the required compaction depth and soil conditions, the cylinder 52 of the angle adjustment mechanism 5 is activated. The output shaft of the cylinder 52 pushes or pulls the adjustment arm 6 around the hinge point between it and the angle adjustment mechanism 5 through the third hinge seat 53, thereby adjusting the height and pitch angle of the rotating column 8 fixed on the adjustment arm 6 and the compaction wheel 9 on it.

[0050] When the device moves, the pressing wheel 9 contacts the ground and rolls. The vertical load and impact it bears from the ground are transmitted to the telescopic airbag 4 through the rotating column 8, adjusting arm 6 and connecting block 7. The gas pressure inside the telescopic airbag 4 can change adaptively. Through its own rapid compression and rebound, it can effectively absorb and buffer vibration and impact, so that the pressing wheel 9 can closely fit the undulating ground surface.

[0051] At the same time, the rotation of the compaction wheel 9 drives the rotation of the rotating column 8, and the second fixed column fixed to one end of the rotating column 8 and the first gear 10 on it rotate synchronously. The first gear 10 meshes with the second gear 13 fixed to the small pressure wheel 12, thereby reliably transmitting power to the auxiliary compaction mechanism, driving the small pressure wheel 12 to rotate synchronously with the compaction wheel 9, and assisting in compacting the soil on both sides of the seedbed. During this process, the second movable block 11 hinged to the adjusting arm 6 allows the small pressure wheel 12 to adapt to slight changes in terrain.

[0052] In addition, the composite elastic structure of the pressing wheel 9 itself, whether it is the polyurethane elastic block 93 in Example 1 or the spring steel 98 in Example 2, can undergo elastic deformation when in contact with the ground, further assisting in buffering local impacts and enhancing the ground contouring effect. The reinforcing column 61 enhances the overall rigidity of the two adjusting arms 6, ensuring the stability of the pressing operation.

[0053] 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.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A no-tillage planter with elastic press wheels, characterized in that: The utility model provides a kind of angle-adjusting mechanism of agricultural machinery, including organic frame (1), two first hinges (2) being fixed to frame (1), first movable block (3) being hinged to first hinge (2), telescopic air bag (4) being fixed to the lower end of first movable block (3), angle-adjusting mechanism (5) being fixed to frame (1), adjusting arm (6) being hinged to angle-adjusting mechanism (5), connecting block (7) being fixed to the upper end of adjusting arm (6), rotating column (8) being through type rotation installation on two adjusting arms (6) and multiple compression wheel bodies (9) being arranged on the outer wall of rotating column (8); The upper end of connecting block (7) is fixed to the lower end of telescopic air bag (4); The side wall of adjusting arm (6) is hinged with auxiliary compression mechanism, a driven gear mechanism is installed on the auxiliary compression mechanism, a driving gear mechanism is installed on rotating column (8), and the driving gear mechanism and the driven gear mechanism are meshed with each other.

2. The no-till planter with elastic down pressure wheel according to claim 1, characterized in that: Angle-adjusting mechanism (5) includes second hinge (51) fixed to frame (1), cylinder (52) hinged to second hinge (51) and third hinge (53) hinged to the output shaft of cylinder (52), and third hinge (53) and adjusting arm (6) are hinged with each other.

3. The no-till planter with elastic down pressure wheel according to claim 1, characterized in that: The auxiliary compression mechanism includes second movable block (11) hinged to adjusting arm (6) and small pressure wheel (12) rotationally installed on second movable block (11).

4. The no-tillage planting device with an elastic press wheel according to claim 3, characterized in that: The driven gear mechanism includes first fixed column fixed to the end of small pressure wheel (12) away from second movable block (11) and second gear (13) fixed to the outer wall of first fixed column, and second movable block (11) is arc-shaped.

5. The no-till planter with resilient down pressure wheels of claim 1, wherein: The driving gear mechanism includes second fixed column fixed to one end of rotating column (8) and first gear (10) fixed to the outer wall of second fixed column, and first gear (10) and second gear (13) are meshed with each other.

6. The no-till planter with a resilient press wheel according to claim 1, characterized in that: The ends of the two adjusting arms (6) close to each other are commonly fixed with a reinforcing column (61).

7. The no-till planter with a resilient press wheel according to claim 1, characterized in that: The compression wheel body (9) is composed of a stainless steel inner cylinder (91) fixed to the outer wall of the rotating column (8), a magnesium steel alloy cylinder (92) fixed to the outer wall of the stainless steel inner cylinder (91), a plurality of polyurethane elastic blocks (93) fixed to the outer wall of the magnesium steel alloy cylinder (92), and a wear-resistant rubber cylinder (94) fixed to the ends of the plurality of polyurethane elastic blocks (93) away from the stainless steel inner cylinder (91), wherein the outer wall of the wear-resistant rubber cylinder (94) is provided with a plurality of first grooves (95), and the polyurethane elastic blocks (93) are arc-shaped.

8. The no-till planting apparatus with a resilient press wheel according to claim 1, characterized in that: The compression wheel body (9) is composed of a wear-resistant steel inner cylinder (96) fixed to the outer wall of the rotating column (8), a nickel-manganese alloy cylinder (97) fixed to the outer wall of the wear-resistant steel inner cylinder (96), a plurality of spring steels (98) fixed to the outer wall of the nickel-manganese alloy cylinder (97), and an aluminum alloy outer cylinder (99) fixed to the ends of the plurality of spring steels (98) away from the wear-resistant steel inner cylinder (96), wherein the outer wall of the aluminum alloy outer cylinder (99) is provided with a plurality of second grooves (910), and the spring steels (98) are arc-shaped.

Images