A resilient gripping mechanism for a tobacco harvesting device

Abstract

The utility model provides a kind of tobacco harvesting device's elastic clamping mechanism, belong to tobacco planting technical field, the tobacco harvesting device's elastic clamping mechanism includes clamping arm and elastic connecting piece, clamping arm is two, two clamping arms are connected by elastic connecting piece each other, the inside of each clamping arm is provided with clamping boss, two clamping bosses are arranged towards each other, clamping boss applies clamping force from the radial direction of tobacco stalk, when tobacco stalk is clamped, clamping boss and the outer surface of tobacco stalk form surface contact, elastic connecting piece is arc plate structure, the both ends of elastic connecting piece are respectively with the one end of two clamping arms Fixed connection, the other end of clamping arm is free end;The utility model can solve the problem that the clamping device of tobacco harvesting device in prior art often produces local stress concentration to tobacco stalk in clamping process, and easily causes tobacco stalk tissue extrusion deformation.

Description

Technical Field

[0001] This utility model belongs to the field of tobacco planting technology, and specifically relates to an elastic clamping mechanism for a tobacco harvesting device. Background Technology

[0002] As an important economic crop, the harvesting process of tobacco directly affects the quality and economic value of tobacco leaves. Traditional manual harvesting methods are labor-intensive and inefficient. With the continuous improvement of agricultural mechanization, tobacco harvesting devices have been gradually promoted and applied. Existing tobacco harvesting devices generally use mechanical clamping methods to fix and cut tobacco stalks. Currently, the most common clamping mechanisms on the market are mainly divided into two categories: rigid clamping mechanisms and simple spring clamping mechanisms. Rigid clamping mechanisms use two parallel metal or plastic plates to clamp the tobacco stalks. This structure is simple and reliable, but the clamping force is difficult to adjust and it has poor adaptability to tobacco stalks of different thicknesses. During the clamping process, excessive clamping force can easily damage tobacco stalks, while insufficient clamping force can cause them to fall off. Although simple spring clamping mechanisms have a certain degree of elastic adjustment, their small contact area and point or line contact make them prone to cracking on the surface of tobacco stalks under clamping force. Field applications show that damage to tobacco stalks during clamping not only affects wound healing but also makes them susceptible to bacterial infection, leading to a decline in tobacco leaf quality. Existing clamping mechanisms also have insufficient ability to capture tobacco stalks, often resulting in missed harvesting during harvesting operations. This necessitates repeated adjustments to the equipment position by operators, severely impacting harvesting efficiency. Utility Model Content

[0003] In view of this, the present invention provides an elastic clamping mechanism for a tobacco harvesting device, which can solve the problem that the clamping device of the existing tobacco harvesting device often causes local stress concentration on the tobacco stalk during the clamping process, which easily leads to the compression and deformation of the tobacco stalk tissue. Damaged tobacco stalks not only affect the quality of subsequent processing of tobacco leaves, but may also lead to the invasion of pathogens and reduce the commercial value of tobacco. At the same time, the existing clamping structure has poor adaptability to tobacco stalks of different thicknesses, and the clamping parts need to be frequently adjusted or replaced during field harvesting operations, which seriously affects the harvesting efficiency and the continuity of operations.

[0004] This utility model is implemented as follows:

[0005] This utility model provides an elastic clamping mechanism for a tobacco harvesting device, used to clamp tobacco stalks. It includes clamping arms and elastic connectors. There are two clamping arms, which are connected to each other by the elastic connectors. Each clamping arm has a clamping boss on its inner side. The two clamping bosses are arranged facing each other. The clamping bosses apply clamping force from the radial direction of the tobacco stalk. When the tobacco stalk is clamped, the clamping bosses form surface contact with the outer surface of the tobacco stalk. The elastic connector is an arc-shaped plate structure. Both ends of the elastic connector are fixedly connected to one end of each of the two clamping arms. The other end of the clamping arm is a free end.

[0006] The technical effects of the elastic clamping mechanism of the tobacco harvesting device provided by this utility model are as follows: The structure design, which applies clamping force from the radial direction of the tobacco stalk through the clamping boss and forms surface contact with the outer surface of the tobacco stalk, makes the clamping force evenly distributed on the surface of the tobacco stalk, avoiding local stress concentration caused by point contact or line contact, and effectively preventing the tobacco stalk from being crushed or damaged during the clamping process. At the same time, the arc-shaped plate structure of the elastic connector provides a continuous and stable elastic restoring force for the two clamping arms, ensuring that the clamping mechanism maintains stable clamping performance during repeated use. The design of the free end of the clamping arm makes it easy for the clamping mechanism to open and smoothly complete the clamping action when it contacts the tobacco stalk.

[0007] Based on the above technical solution, the elastic clamping mechanism of the tobacco harvesting device of this utility model can be further improved as follows:

[0008] The length of the clamping boss extending along the axial direction of the tobacco stalk is greater than the thickness of the clamping arm extending along the axial direction of the tobacco stalk.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the length of the clamping boss extending along the axial direction of the tobacco stalk is greater than the thickness of the clamping arm extending along the axial direction of the tobacco stalk. This dimensional relationship increases the contact area between the clamping boss and the tobacco stalk, further improving the dispersion effect of the clamping force and reducing the pressure per unit area. At the same time, the longer clamping boss can adapt to tobacco stalks of different diameters, enhancing the versatility and adaptability of the clamping mechanism. Furthermore, it provides better anti-slip capability when the tobacco stalk is subjected to axial tension, ensuring that the tobacco stalk will not fall out of the clamping mechanism during harvesting.

[0010] Furthermore, the radius of curvature of the elastic connector is 15~25mm, and the thickness of the elastic connector is less than the thickness of the clamping arm.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the radius of curvature of the elastic connector is controlled within the range of 15~25 mm. This curvature range ensures that the elastic connector has sufficient elastic deformation capacity to adapt to tobacco stalks of different thicknesses, while avoiding plastic deformation or fatigue fracture caused by excessively small radius of curvature during repeated use. The thickness of the elastic connector is less than the thickness of the clamping arm, making the elastic connector the main deformation part in the entire clamping mechanism. This design concentrates deformation on the elastic connector, protects the structural stability of the clamping arm and clamping boss, and extends the service life of the entire clamping mechanism.

[0012] Furthermore, the cross-section of the clamping boss is semi-elliptical, and a smooth transition is formed between the clamping boss and the inner side of the clamping arm.

[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the cross-section of the clamping boss is semi-elliptical and forms a smooth transition with the inner side of the clamping arm. This shape design eliminates sharp corners and abrupt structures, allowing the clamping boss to fit more closely to the cylindrical outer surface of the tobacco stalk when it comes into contact with it. The stress distribution generated during the clamping process is more uniform due to the semi-elliptical cross-section, avoiding the possibility of leaving indentations on the surface of the tobacco stalk if the cross-section is square or has other sharp edges. The smooth transition structure also reduces stress concentration and improves the fatigue resistance of the clamping boss itself.

[0014] Furthermore, each clamping arm has three clamping protrusions on its inner side, and the three clamping protrusions are evenly distributed along the length of the clamping arm.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: each clamping arm has three clamping protrusions on its inner side, which are evenly distributed along the length of the clamping arm. This multi-point clamping design makes the clamping force distributed along the length of the tobacco stalk, effectively preventing the tobacco stalk from bending or breaking due to single-point clamping. The evenly distributed distribution of the three clamping protrusions ensures the symmetry and balance of the clamping force, so that the tobacco stalk remains axially stable in the clamping state and will not deflect or tilt. At the same time, the multi-point contact formed by the three clamping protrusions enhances the clamping mechanism's control over the tobacco stalk, and improves the reliability and stability of the harvesting operation.

[0016] Furthermore, a groove is formed on the inner side of the clamping arm between two adjacent clamping bosses, and the depth of the groove is 2~4 mm.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: a groove with a depth of 2 to 4 mm is formed on the inner side of the clamping arm between two adjacent clamping protrusions. This groove structure provides a space for small branches or epidermal protrusions that may exist on the surface of the tobacco stalk, avoiding the damage to the main structure of the tobacco stalk by these appendages being forcibly compressed during the clamping process. The presence of the groove also increases the flexibility of the clamping arm, enabling the clamping arm to have a certain ability to adapt and adjust when clamping irregularly shaped tobacco stalks. The depth is controlled within the range of 2 to 4 mm, which ensures the accommodating function without weakening the overall rigidity of the clamping arm.

[0018] Furthermore, the free end of the clamping arm bends outward to form a guide section, and the radius of curvature of the guide section is greater than the radius of curvature of the elastic connector.

[0019] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the free end of the clamping arm bends outward to form a guide part, and the radius of curvature of the guide part is greater than the radius of curvature of the elastic connector. This structural design allows the guide part to contact the tobacco stalk first when the clamping mechanism approaches the tobacco stalk and guide the tobacco stalk into the clamping space between the two clamping arms. The larger radius of curvature of the guide part forms a smooth transition curve, reducing the resistance when the tobacco stalk enters and avoiding violent collision between the tobacco stalk and the clamping mechanism. The design of the guide part also expands the effective capture range of the clamping mechanism, improves the efficiency of harvesting operations, and reduces the phenomenon of missed harvesting caused by inaccurate positioning.

[0020] Furthermore, the clamping arm and the flexible connector are integrally molded from polypropylene material.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the clamping arm and the elastic connector are integrally molded from polypropylene material. Polypropylene material has good elasticity and toughness, which can meet the needs of repeated elastic deformation of the clamping mechanism during use. The integral molding manufacturing method eliminates the connection seams and weak links, improves the structural strength and durability of the entire clamping mechanism. Polypropylene material also has the characteristics of being lightweight, corrosion-resistant and easy to process, so that the clamping mechanism will not increase the overall burden of the harvesting device when used in the field, and can resist the erosion of tobacco juice and field humidity environment, thus extending its service life.

[0022] Furthermore, the distance between the clamping bosses of the two clamping arms in their natural state is 8~12 mm.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the distance between the clamping bosses of the two clamping arms in their natural state is 8~12mm. This distance range is designed based on the common diameter range of tobacco stalks, so that the elastic connector of the clamping mechanism produces a moderate amount of deformation when clamping the tobacco stalks. This ensures sufficient clamping force while avoiding elastic failure caused by excessive deformation. The 8~12mm distance also provides good adaptability to tobacco stalks at different growth stages and of different varieties, allowing the same clamping mechanism to be applied to various harvesting scenarios, reducing downtime and maintenance costs caused by changing the clamping mechanism.

[0024] Furthermore, a reinforcing rib is provided at the connection between the clamping arm and the elastic connector. The reinforcing rib extends along the width direction of the clamping arm, and the thickness of the reinforcing rib is 1.5 to 2 times the thickness of the clamping arm.

[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: a reinforcing rib with a thickness of 1.5 to 2 times the thickness of the clamping arm is provided at the connection between the clamping arm and the elastic connector and extends along the width direction of the clamping arm. The setting of the reinforcing rib significantly improves the structural strength of the connection and effectively prevents fatigue cracks or fractures from occurring in this part under the repeated action of clamping force and elastic recovery force. The arrangement of the reinforcing rib extending along the width direction makes the transition of stress from the clamping arm to the elastic connector more gradual and avoids stress abrupt change. The thickness of the reinforcing rib is controlled within the range of 1.5 to 2 times the thickness of the clamping arm, which ensures the reinforcement effect without affecting the overall flexibility of the clamping mechanism due to excessive thickness, thus achieving the best balance between strength and flexibility.

[0026] Compared with existing technologies, the beneficial effects of the elastic clamping mechanism of the tobacco harvesting device provided by this utility model are as follows: By setting clamping protrusions on the inner side of the clamping arms and applying clamping force from the radial direction of the tobacco stalk to form surface contact, the technical problem of localized concentration of clamping force leading to tobacco stalk damage in existing technologies is fundamentally solved. The surface contact between the clamping protrusions and the outer surface of the tobacco stalk ensures that the clamping force is evenly distributed over a large contact area, reducing the pressure per unit area to within the tolerance range of the tobacco stalk tissue, effectively avoiding epidermal damage and internal tissue damage. The arc-shaped plate structure of the elastic connector provides a continuous and stable elastic restoring force for the two clamping arms, enabling the clamping mechanism to automatically adjust the clamping force when clamping tobacco stalks of different diameters, achieving flexible clamping of the tobacco stalk. The design of multiple clamping protrusions distributed along the length of the clamping arms further enhances the stability and reliability of the clamping, preventing axial slippage or radial deflection of the tobacco stalk under clamping conditions. The design of the guide part improves the success rate of the clamping mechanism in capturing tobacco stalks, reducing missed harvesting and repeated operations. The one-piece molding of polypropylene material not only ensures that the clamping mechanism has excellent elasticity and toughness, but also improves structural strength and durability, enabling the clamping mechanism to work stably for a long time in harsh field environments. This significantly improves the overall performance and service life of the tobacco harvesting device and provides reliable technical support for mechanized tobacco harvesting. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of an elastic clamping mechanism for a tobacco harvesting device;

[0029] Figure 2 A top view of an elastic clamping mechanism of a tobacco harvesting device;

[0030] Figure 3 A schematic diagram of an embodiment of an elastic clamping mechanism for a tobacco harvesting device;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 10. Clamping arm; 11. Elastic connector; 12. Clamping boss; 13. Groove; 14. Guide part. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figure 1-3 The image shows an embodiment of an elastic clamping mechanism for a tobacco harvesting device provided by this utility model. In this embodiment, it is used to clamp tobacco stalks and includes clamping arms 10 and elastic connectors 11. There are two clamping arms, which are connected to each other through the elastic connectors. Each clamping arm has a clamping boss 12 on its inner side. The two clamping bosses are arranged facing each other. The clamping bosses apply clamping force from the radial direction of the tobacco stalk. When the tobacco stalk is clamped, the clamping bosses form surface contact with the outer surface of the tobacco stalk. The elastic connector is an arc-shaped plate structure. The two ends of the elastic connector are fixedly connected to one end of each of the two clamping arms, and the other end of the clamping arms is a free end.

[0035] In the above technical solution, the length of the clamping boss extending along the axial direction of the tobacco stalk is greater than the thickness of the clamping arm extending along the axial direction of the tobacco stalk.

[0036] Furthermore, in the above technical solution, the radius of curvature of the elastic connector is 15~25mm, and the thickness of the elastic connector is less than the thickness of the clamping arm.

[0037] Furthermore, in the above technical solution, the cross-section of the clamping boss is semi-elliptical, and a smooth transition is formed between the clamping boss and the inner side of the clamping arm.

[0038] Furthermore, in the above technical solution, each clamping arm has three clamping protrusions on its inner side, and the three clamping protrusions are evenly distributed along the length direction of the clamping arm.

[0039] Furthermore, in the above technical solution, a groove 13 is formed on the inner side of the clamping arm between two adjacent clamping bosses, and the depth of the groove is 2~4 mm.

[0040] Furthermore, in the above technical solution, the free end of the clamping arm bends outward to form a guide portion 14, and the radius of curvature of the guide portion is greater than the radius of curvature of the elastic connector.

[0041] Furthermore, in the above technical solution, the clamping arm and the elastic connector are integrally molded from polypropylene material.

[0042] Furthermore, in the above technical solution, the distance between the clamping bosses of the two clamping arms in their natural state is 8~12 mm.

[0043] Furthermore, in the above technical solution, a reinforcing rib is provided at the connection between the clamping arm and the elastic connector. The reinforcing rib extends along the width direction of the clamping arm, and the thickness of the reinforcing rib is 1.5 to 2 times the thickness of the clamping arm.

[0044] The method of using this utility model is as follows: First, install the elastic clamping mechanism on the clamping position of the tobacco harvesting device. Fix the mounting end of the elastic connector to the support frame of the harvesting device using bolts or other fixing methods, ensuring that the two clamping arms can open and close freely. Before starting the harvesting operation, check whether the elasticity of the clamping arms is normal and observe whether there is wear or damage on the surface of the clamping boss. When the harvesting device moves towards the tobacco plant, the operator or automatic control system adjusts the position of the harvesting device so that the elastic clamping mechanism is aligned with the target tobacco stalk. When the tobacco stalk contacts the guide part, the curved surface of the guide part guides the tobacco stalk into the space between the two clamping arms. At this time, the elastic connector begins to bend and deform, and the two clamping arms gradually tighten inwards, clamping the boss and the tobacco... The outer surface of the stalk contacts and applies clamping force. When the clamping force reaches a preset value, the tobacco stalk is stably clamped in the clamping mechanism. At this time, the cutting mechanism of the harvesting device is activated to cut the tobacco stalk below the clamping position. After the cutting is completed, the clamping mechanism continues to maintain the clamping state and transports the cut tobacco stalk to the collecting device. After the tobacco stalk is received by the collecting device, the elastic clamping mechanism releases and resets, ready for the next clamping operation. During the entire operation, the clamping mechanism automatically completes the opening and clamping actions by relying on the elastic restoring force of the elastic connector, without the need for additional power drive. After the operation is completed, the tobacco juice and debris attached to the surface of the clamping boss should be cleaned in time to keep the clamping mechanism clean. The elastic connector should be checked regularly for fatigue cracks and replaced if necessary.

[0045] The following is a specific embodiment 1 of this utility model: The elastic clamping mechanism in this embodiment is integrally manufactured using polypropylene material through injection molding. The density of polypropylene is 0.9 g / cm³. 3The material has an elastic modulus of 1400 MPa, a yield strength of 30 MPa, and an elongation at break of 400 percent. These material properties ensure that the clamping mechanism has good elasticity and toughness. The overall length of the clamping arm is 80 mm, the width is 25 mm, and the thickness is 3 mm. Each clamping arm has a rectangular plate structure. Three clamping bosses are provided on the inner side of the clamping arm along the length direction. The center positions of the three clamping bosses are 20 mm, 40 mm, and 60 mm away from the connection end between the clamping arm and the elastic connector, respectively, to achieve equal spacing. Each clamping boss has a semi-elliptical cross-section. The major axis of the semi-ellipse is 8 mm, arranged along the length of the clamping arm, and the minor axis is 4 mm, perpendicular to the inner side of the clamping arm. The clamping boss extends 18 mm along the width of the clamping arm. The clamping boss and the inner side of the clamping arm are connected by a smooth transition surface with a radius of 2 mm. A groove with a depth of 3 mm is formed on the inner side of the clamping arm between two adjacent clamping bosses. The cross-section of the groove is arc-shaped. The elastic connector is an arc-shaped plate structure with a radius of curvature of 20 mm and a central angle of 90°. The elastic connector is 2 mm thick and 25 mm wide, the same as the clamping arm. Both ends of the elastic connector are connected to one end of each of the two clamping arms through smooth curved transitions. Reinforcing ribs are provided at the connection points. The reinforcing ribs extend along the width of the clamping arm, with a length of 20 mm, a thickness of 5 mm, and a height of 8 mm. The free ends of the clamping arms bend outwards to form guide sections with a radius of curvature of 30 mm and an arc length of 15 mm. The thickness of the guide section gradually decreases to 2 mm at the end, forming a smooth transition. In their natural state, the distance between the most prominent points of the clamping bosses on the two clamping arms is 10 mm. When the distance is increased to 30 mm, the maximum bending stress generated by the elastic connector is 25 MPa, which is within the elastic deformation range of the material. In this embodiment, when clamping tobacco stalks with a diameter of 12-18 mm, the elastic clamping mechanism forms a total area of ​​approximately 300 mm between the clamping bosses and the outer surface of the tobacco stalk. 2 The contact area is controlled within the range of 0.5~1.2MPa, which is far lower than the compressive strength of tobacco stalk tissue. When using the clamping mechanism of this embodiment for harvesting operations, the clamping process is stable and reliable, and no obvious indentations or damage appear on the surface of the tobacco stalk. The clamping mechanism shows good adaptability to tobacco stalks of different diameters. The guide part effectively guides the tobacco stalk into the clamping position, improving the clamping success rate. Continuous operation tests show that the elastic connector has stable performance during repeated elastic deformation and no plastic deformation or fatigue fracture occurs.

[0046] The following is another specific embodiment 2 of this utility model: Based on embodiment 1, the number of clamping protrusions on the inner side of each clamping arm is increased to five. These five clamping protrusions are evenly spaced along the length of the clamping arm, with a center-to-center distance of 15 mm between adjacent clamping protrusions. The cross-sectional shape of the clamping protrusions is changed to a semi-circle with a radius of 4 mm. The length of the clamping protrusions extending along the width of the clamping arm is adjusted to 15 mm, and the groove depth between adjacent clamping protrusions is adjusted to 2.5 mm. This improvement increases the number of contact points between the clamping protrusions and the tobacco stalk, resulting in a more uniform and dense distribution of clamping force. It is particularly suitable for tobacco varieties with fragile stalk surfaces or high moisture content. The multi-point clamping structure formed by the five clamping protrusions provides stronger axial constraint on the tobacco stalk, effectively preventing axial slippage of the tobacco stalk due to vibration during cutting. The semi-circular cross-section of the clamping protrusions provides better contact with the tobacco stalk, allowing for more thorough adaptation to the minute undulations on the surface of the tobacco stalk during clamping.

[0047] The following is another specific embodiment 3 of this utility model: Based on embodiment 1, an auxiliary elastic layer is added to the outer surface of the elastic connector. The auxiliary elastic layer is made of thermoplastic polyurethane elastomer material with a thickness of 1.5 mm. The auxiliary elastic layer is fixed to the outer surface of the elastic connector by hot-melt bonding. The elastic modulus of the auxiliary elastic layer is 50 MPa, lower than that of the polypropylene matrix material. This composite structure makes the restoring force generated by the elastic connector under the same deformation more gentle, and the clamping force change curve more gradual. The addition of the auxiliary elastic layer also enhances the fatigue resistance of the elastic connector. The stress concentration is dispersed through the synergistic deformation of the two materials, extending the service life of the clamping mechanism. Simultaneously, the distance between the clamping bosses in the natural state of the clamping arms is adjusted to 9 mm, making the clamping mechanism more suitable for clamping tobacco stalks with smaller diameters, expanding the application range of the clamping mechanism. This improvement is particularly suitable for tobacco varieties harvested early or with thinner stalks.

[0048] Specifically, the principle of this invention is as follows: The shape and arrangement of the clamping protrusions achieve surface contact clamping of the tobacco stalk, thereby evenly distributing the clamping force over a larger contact area. As the contact area increases, the pressure per unit area decreases accordingly. Since the tobacco stalk, as a biological tissue, has a certain compressive strength limit, increasing the contact area allows the pressure to be controlled within the tolerance range of the tobacco stalk tissue, preventing tissue damage. The clamping protrusions apply clamping force radially to the tobacco stalk. This radial clamping method ensures that the direction of the clamping force is perpendicular to the axial direction of the tobacco stalk, effectively preventing axial slippage of the tobacco stalk during clamping. Simultaneously, the radial clamping force forms a uniform pressure distribution along the circumference of the tobacco stalk, avoiding stalk bending deformation caused by unilateral force. The arc-shaped plate structure of the elastic connector utilizes the principle of elastic deformation of materials to provide restoring force to the two clamping arms. When the tobacco stalk enters the clamping space, the elastic connector bends and deforms, generating elastic potential energy. This elastic potential energy is converted into a restoring force acting on the clamping arms, which is then transferred to the tobacco stalk through the clamping bosses to form a clamping force. The radius of curvature and thickness of the elastic connector determine its stiffness characteristics. By rationally designing these parameters, the clamping force can be automatically adjusted according to the diameter of the tobacco stalk, achieving flexible adaptation to tobacco stalks of different thicknesses. The distributed arrangement of multiple clamping bosses forms a multi-point support structure. According to the principle of static equilibrium, multi-point support can better constrain the spatial position of the clamped object and improve the stability of clamping. The curved surface design of the guide part utilizes the guiding principle, guiding the tobacco stalk into the clamping position through the gradually contracting curved surface, reducing the impact force during the clamping process.

Claims

1. An elastic clamping mechanism for a tobacco harvesting device, used for clamping tobacco stalks, comprising clamping arms and elastic connectors, wherein there are two clamping arms connected to each other by the elastic connectors, and each clamping arm has a clamping protrusion on its inner side, the two clamping protrusions being arranged facing each other, characterized in that, The clamping boss applies clamping force in the radial direction of the tobacco stalk. When the tobacco stalk is clamped, the clamping boss forms surface contact with the outer surface of the tobacco stalk. The elastic connector is an arc-shaped plate structure. Both ends of the elastic connector are fixedly connected to one end of each of the two clamping arms, and the other end of the clamping arm is a free end.

2. The elastic clamping mechanism of a tobacco harvesting device according to claim 1, characterized in that, The length of the clamping boss extending along the axial direction of the tobacco stalk is greater than the thickness of the clamping arm extending along the axial direction of the tobacco stalk.

3. The elastic clamping mechanism of a tobacco harvesting device according to claim 2, characterized in that, The radius of curvature of the elastic connector is 15~25mm, and the thickness of the elastic connector is less than the thickness of the clamping arm.

4. The elastic clamping mechanism of a tobacco harvesting device according to claim 3, characterized in that, The cross-section of the clamping boss is semi-elliptical, and there is a smooth transition between the clamping boss and the inner side of the clamping arm.

5. The elastic clamping mechanism of a tobacco harvesting device according to claim 4, characterized in that, Each clamping arm has three clamping protrusions on its inner side, and the three clamping protrusions are evenly distributed along the length of the clamping arm.

6. The elastic clamping mechanism of a tobacco harvesting device according to claim 5, characterized in that, A groove is formed on the inner side of the clamping arm between two adjacent clamping bosses, and the depth of the groove is 2~4 mm.

7. The elastic clamping mechanism of a tobacco harvesting device according to claim 6, characterized in that, The free end of the clamping arm bends outward to form a guide section, and the radius of curvature of the guide section is greater than the radius of curvature of the elastic connector.

8. The elastic clamping mechanism of a tobacco harvesting device according to claim 7, characterized in that, The clamping arm and flexible connector are integrally molded from polypropylene material.

9. The elastic clamping mechanism of a tobacco harvesting device according to claim 8, characterized in that, The distance between the clamping bosses of the two clamping arms in their natural state is 8~12mm.

10. The elastic clamping mechanism of a tobacco harvesting device according to claim 9, characterized in that, A reinforcing rib is provided at the connection between the clamping arm and the elastic connector. The reinforcing rib extends along the width direction of the clamping arm, and the thickness of the reinforcing rib is 1.5 to 2 times the thickness of the clamping arm.

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