A picking frequency adjustable pineapple harvesting device
Patent Information
- Application Number
- CN202522366588.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-07
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-11-07
AI Technical Summary
Existing pineapple harvesting equipment cannot adapt to harvesting operations in pineapple fields with different planting densities, and the fixed connection between the fruit collection box and the harvesting device is prone to damage to the connection structure.
A pineapple harvesting device with adjustable harvesting frequency was designed. The high ground clearance fruit collection box is rotatably connected to the frame. The harvesting unit of the harvesting device is bolted to the arc-shaped slide, and the spacing can be adjusted to achieve frequency adjustment. The fruit is lifted by the arc-shaped limiting grid and the sliding plate structure. The frame and the high ground clearance fruit collection box and the conveying device and the high ground clearance fruit collection box are rotatably connected to adapt to changes in ground height.
This technology enables efficient harvesting of pineapples in fields with varying planting densities, avoids damage to the connecting structure, and improves the adaptability and lifespan of the device.
Smart Images
Figure CN224924266U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a pineapple harvesting device with adjustable harvesting frequency, belonging to the field of pineapple harvesting technology. Background Technology
[0002] To achieve mechanized pineapple harvesting, various pineapple harvesting devices have emerged in existing technologies. Due to structural limitations, the number of picking combs and the distance between each pair of adjacent picking combs are fixed, which means that the harvesting devices can only perform harvesting operations at a fixed frequency. When faced with pineapple fields with different planting densities, more precise harvesting operations cannot be achieved. When the planting density of the pineapple field where the harvesting device is operating is relatively sparse or relatively dense, the picking combs are prone to spinning idle or missing harvesting. In addition, most existing pineapple harvesting devices include a fruit collection box and a harvesting device. However, the fruit collection box and the frame of the harvesting device are usually fixedly connected. When the ground is uneven, this fixed connection will cause the fruit collection box and the harvesting device to change height synchronously. This places high demands on the connection strength of the connection between the fruit collection box and the frame. After long-term use, the connection structure is easily damaged, which will affect the service life of the harvesting device.
[0003] Therefore, there is an urgent need for a new type of pineapple harvesting device to solve the problems that existing pineapple harvesting devices cannot adapt to harvesting operations in pineapple fields with different planting densities, and that the fixed connection between the fruit collection box and the harvesting device is prone to damage to the connection structure. Utility Model Content
[0004] This invention aims to solve the problems of existing pineapple harvesting devices being unable to adapt to harvesting operations in pineapple fields with different planting densities and the fixed connection between the fruit collection box and the harvesting device easily causing damage to the connection structure, and thus provides a pineapple harvesting device with adjustable harvesting frequency.
[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: A pineapple harvesting device with adjustable harvesting frequency includes a high ground clearance fruit collection box, a harvesting device, a frame, a conveying device, and a traveling device. The high ground clearance fruit collection box is connected to the rear of a traction device. One end of the frame is rotatably mounted on the rear end of the high ground clearance fruit collection box. The harvesting device is rotatably mounted on the frame. The conveying device is fixed to the frame, with one end located at the fruit outlet side of the harvesting device and the other end rotatably mounted on the rear of the high ground clearance fruit collection box. Traveling devices are provided at the bottom of both the high ground clearance fruit collection box and the bottom of the frame. The harvesting device includes a harvesting main body and a sliding plate and an arc-shaped limiting grid located inside the harvesting main body. The harvesting main body includes two coaxially arranged frame rings and several harvesting units arranged circumferentially between the two frame rings. One frame ring is connected to a drive device. Each frame ring has several arc-shaped slides circumferentially formed on it. Several harvesting units are connected to the arc-shaped slides on both sides of the frame ring by bolts. The slide plate is tilted and its lower end is fixed to the conveying device. The top of the arc-shaped limiting grid is an open end and is fixed to the bottom of the slide plate by the first mounting bracket. The arc-shaped limiting grid limits the pineapple fruits in the picking unit below it.
[0006] Furthermore, the conveying device includes an outer shell, an active roller and a driven roller disposed inside the outer shell, a base belt fitted on the active roller and the driven roller, and several transverse partitions fixedly mounted on the surface of the base belt along the length of the base belt. The lower end of the slide plate is fixedly connected to the outer shell, and the active roller is rotatably installed at the rear of the high ground clearance fruit collection box.
[0007] Furthermore, the walking device includes two first walking wheels installed below the high ground clearance fruit collection box and two second walking wheels installed below the frame, with the drive roller connected to the first walking wheels below it via a chain drive assembly.
[0008] Furthermore, the chain drive assembly includes a first chain drive assembly, a second chain drive assembly, and a third chain drive assembly connected in sequence. The second chain drive assembly is rotatably installed inside the high ground clearance fruit collection box, and the driving sprocket in the second chain drive assembly is coaxially and fixedly connected to the driven sprocket in the first chain drive assembly. The driven sprocket in the second chain drive assembly is coaxially and fixedly connected to the driving connecting wheel in the third chain drive assembly. The driving sprocket in the first chain drive assembly is coaxially and fixedly connected to the first traveling wheel. The driven sprocket in the third chain drive assembly is coaxially and fixedly connected to the driving roller.
[0009] Furthermore, the drive device includes a fourth chain drive assembly and a tension wheel assembly. A flange is coaxially fixed to one of the frame rings in the harvesting device. The driven sprocket in the fourth chain drive assembly is coaxially fixed to the flange. Its driving connecting wheel is rotatably installed at the rear of the high ground clearance fruit collection box and is coaxially fixed to the driving sprocket in the third chain drive assembly through a connecting shaft.
[0010] Furthermore, the tensioning wheel assembly includes a tensioning sprocket, a second mounting bracket, a fixed rod, a movable rod, and a spring. The second mounting bracket is fixedly mounted at the rear end of the high ground clearance fruit collection box, the fixed rod is vertically fixedly mounted at the bottom end of the second mounting bracket, one end of the movable rod is hinged to the bottom end of the fixed rod, the tensioning sprocket is rotatably mounted at the other end of the movable rod, and the spring is connected between the other end of the movable rod and the top end of the fixed rod.
[0011] Furthermore, the arc-shaped limiting grid adopts a semi-circular structure, and its axial length is less than the distance between the two frame rings.
[0012] Furthermore, the skateboard has a cushioning layer inside, and the skateboard has a tilt angle of 30°.
[0013] Furthermore, there are two harvesting devices arranged side by side.
[0014] Furthermore, the picking unit includes a picking component and a limiting component arranged in an L-shape, wherein the picking component and the limiting component are respectively a mesh-like structure or a comb-like structure.
[0015] Compared with the prior art, the present invention has the following advantages: In this invention, the frame and the high ground clearance fruit collection box, as well as the conveying device and the high ground clearance fruit collection box, are rotatably connected, which can better adapt to changes in ground elevation and effectively avoid damage to the connection structure.
[0016] By providing several arc-shaped tracks along the circumference of each frame, and connecting several harvesting units to the corresponding arc-shaped tracks on both sides with bolts, the installation position and number of harvesting units can be adjusted. That is, loosening or tightening the bolts adjusts the spacing between any two adjacent harvesting units, or increases or decreases the number of harvesting units. By adjusting the installation position and number of harvesting units, the harvesting frequency can be adjusted. Compared to existing structures where harvesting units are fixed to the frame by welding, this harvesting device can adapt to harvesting operations in pineapple fields with different planting densities. For example, when the planting density is high, the number of harvesting units can be appropriately reduced or the distance between any two adjacent harvesting units can be shortened; when the planting density is low, the number of harvesting units can be appropriately increased or the distance between any two adjacent harvesting units can be widened.
[0017] As the frame rotates, the harvesting unit, which gradually approaches the pineapple plant, generates a bending moment on the plant, thus separating the fruit stem. Simultaneously, utilizing its own lifting action and the limiting effect of the arc-shaped retaining grid, the harvesting unit can elevate the picked fruit above the sliding plate. Attached Figure Description
[0018] Figure 1 This is a first three-dimensional structural diagram of the adjustable-frequency pineapple harvesting device of this utility model. Figure 2 This is a second three-dimensional structural diagram of the adjustable-frequency pineapple harvesting device of this utility model. Figure 3 This is a schematic diagram of the third three-dimensional structure of the adjustable-frequency pineapple harvesting device of this utility model. Figure 4 This is a schematic diagram of the fourth three-dimensional structure of the adjustable-frequency pineapple harvesting device of this utility model. Figure 5 This is a side view of the pineapple harvesting device with adjustable harvesting frequency according to the present invention. Figure 6 This is a schematic diagram of the first three-dimensional structure of the harvesting device; Figure 7 This is a schematic diagram of the second three-dimensional structure of the harvesting device; Figure 8 A schematic diagram of the chain drive assembly between the drive roller and the first traveling wheel; Figure 9 This is a schematic diagram of the first three-dimensional structure of the conveying device; Figure 10 This is a schematic diagram of the second three-dimensional structure of the conveying device (baseband perspective). Figure 11 This is a partially enlarged schematic diagram of the tensioner assembly; Figure 12 A schematic diagram of the three-dimensional structure of the frame; Figure 13 A schematic diagram of the three-dimensional structure of the arc-shaped limiting grid; Figure 14 This is a schematic diagram of the three-dimensional structure of the harvesting unit.
[0019] In the picture: 1. High ground clearance fruit collection box; 2. Harvesting device; 21. Slide plate; 22. Arc-shaped limiting grid; 23. First mounting frame; 24. Frame ring; 241. Arc-shaped slide rail; 25. Harvesting unit; 26. Flange; 27. Mounting rod; 3. Frame; 4. Conveying device; 41. Outer shell; 42. Driven roller; 43. Driven roller; 44. Base belt; 45. Horizontal partition; 51. First traveling wheel; 52. Second traveling wheel; 6. First chain drive assembly; 7. Second chain drive assembly; 8. Third chain drive assembly; 9. Fourth chain drive assembly; 10. Tensioning wheel assembly; 101. Tensioning sprocket; 102. Second mounting frame; 103. Fixed rod; 104. Movable rod; 105. Spring; 11. Connecting shaft. Detailed Implementation
[0020] Specific implementation method one: Combining Figures 1-14 This description aims to clearly and completely describe the technical solutions in this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0021] A pineapple harvesting device with adjustable harvesting frequency includes a high-clearance fruit collection box 1, a harvesting device 2, a frame 3, a conveying device 4, and a traveling device. The high-clearance fruit collection box 1 is connected to the rear of a traction device. One end of the frame 3 is rotatably mounted on the rear end of the high-clearance fruit collection box 1. The harvesting device 2 is rotatably mounted on the frame 3. The conveying device 4 is fixed to the frame 3, with one end located at the fruit outlet side of the harvesting device 2 and the other end rotatably mounted on the rear of the high-clearance fruit collection box 1. Traveling devices are provided at the bottom of both the high-clearance fruit collection box 1 and the bottom of the frame 3. The harvesting device 2 includes a harvesting main body, a sliding plate 21 and an arc-shaped limiting grid 22 located inside the harvesting main body. The harvesting main body includes two coaxially arranged frame rings 24 and a plurality of harvesting units 25 arranged circumferentially between the two frame rings 24. One of the frame rings 24 is connected to a driving device. Each frame ring 24 has a plurality of arc-shaped slides 241 opened circumferentially on it. The plurality of harvesting units 25 are connected to the arc-shaped slides 241 on both sides of the frame ring 24 by bolts. The slide plate 21 is arranged at an angle and its lower end is fixedly connected to the conveying device 4. The top of the arc-shaped limiting grid 22 is an open end and is fixedly mounted below the slide plate 21 by the first mounting bracket 23. The arc-shaped limiting grid 22 limits the pineapple fruit in the picking unit 25 below it.
[0022] During harvesting, the high-clearance fruit collection box 1 is towed by a traction device. The height of the high-clearance fruit collection box 1 above the ground must be higher than the height of the pineapple plant to prevent damage to the pineapple. In addition, the high-clearance fruit collection box 1 adopts a wire mesh structure, which can effectively reduce the overall weight. A three-point suspension structure is preferred for easy connection with the traction device.
[0023] The high ground clearance fruit collection box 1 is connected to the traction equipment by a rotating connection to adapt to changes in ground elevation.
[0024] The traction device can be any device capable of traction, such as a tractor.
[0025] The traction device in this utility model can traction or push the pineapple harvesting device to move. The forward and backward directions used in this utility model are based on the directions shown in the figure and do not represent the actual direction of movement during operation.
[0026] The harvesting mechanism is used to separate the pineapple fruit from the stem and lift the harvested pineapple fruit above the slide plate 21.
[0027] The drive device is used to drive the frame ring 24 to rotate, thereby driving the picking unit 25 on it to rotate.
[0028] Each picking unit 25 is mounted on two frame rings 24 and rotates as the frame rings 24 rotate.
[0029] The arc-shaped limiting grid 22 can effectively prevent the fruit in the picking unit 25 from falling.
[0030] As the frame ring 24 rotates, the harvesting unit 25, which gradually approaches the pineapple plant as the frame ring 24 rotates, generates a bending moment on the pineapple plant, thereby separating the fruit stem. At the same time, utilizing its own lifting effect and the limiting effect of the arc-shaped limiting grid 22, the harvesting unit 25 can lift the harvested fruit above the sliding plate 21.
[0031] The arc-shaped limiting grid 22 adopts a grid structure, which can effectively reduce its own weight, thereby effectively reducing the load-bearing pressure of the fixed structure between the slide plate 21 and the conveying device 4.
[0032] In this invention, the frame 3 and the high ground clearance fruit collection box 1, as well as the conveying device 4 and the high ground clearance fruit collection box 1, are rotatably connected, which can better adapt to changes in ground elevation and effectively avoid damage to the connection structure.
[0033] By providing several arc-shaped slides 241 along the circumference of each frame ring 24, and by bolting several harvesting units 25 to the arc-shaped slides 241 on both sides, the installation position and number of harvesting units 25 can be adjusted. That is, loosening and tightening the bolts adjusts the spacing between any two adjacent harvesting units 25, or increases or decreases the number of harvesting units 25. By adjusting the installation position and number of harvesting units 25, the harvesting frequency can be adjusted. Compared with existing structures where harvesting units 25 are fixed to the frame ring 24 by welding, the harvesting device 2 of this invention can adapt to harvesting operations in pineapple fields with different planting densities. For example, when the planting density is high, the number of harvesting units 25 can be appropriately reduced or the distance between any two adjacent harvesting units 25 can be shortened; when the planting density is low, the number of harvesting units 25 can be appropriately increased or the distance between any two adjacent harvesting units 25 can be widened.
[0034] The number of harvesting devices 2 is the same as the number of conveying devices 4, which can be one, two or more. Based on the double-row planting pattern of pineapples, this application can harvest multiple rows at once.
[0035] The conveying device 4 includes an outer casing 41, an active roller 42 and a driven roller 43 disposed inside the outer casing 41, a base belt 44 fitted onto the active roller 42 and the driven roller 43, and several transverse partitions 45 fixedly mounted on the surface of the base belt 44 along its length. The lower end of the sliding plate 21 is fixedly connected to the outer casing 41, and the active roller 42 is rotatably mounted at the rear of the high ground clearance fruit collection box 1. In this design, the base belt 44 is essentially a belt. By setting several transverse partitions 45 on the base belt 44, the pineapple fruits are blocked during the conveying process, effectively preventing the pineapple fruits from rolling off the belt during the conveying process into the high ground clearance fruit collection box 1. This ensures stable and reliable transmission of the pineapple fruits and further improves fruit collection efficiency.
[0036] The walking device includes two first walking wheels 51 installed below the high-clearance fruit collection box 1 and two second walking wheels 52 installed below the frame 3. The drive roller 42 is connected to the first walking wheels 51 below it via a chain drive assembly. This design provides rotational power to the conveyor 4 via the first walking wheels 51, and the movement of the base belt 44 is synchronized with the movement of the walking device. Compared to existing methods that use motors for power, this eliminates the need for batteries and speed controllers, effectively saving energy consumption.
[0037] The chain drive assembly includes a first chain drive assembly 6, a second chain drive assembly 7, and a third chain drive assembly 8 connected in sequence. The second chain drive assembly 7 is rotatably mounted inside the high-clearance fruit collection box 1. The driving sprocket in the second chain drive assembly 7 is coaxially and fixedly connected to the driven sprocket in the first chain drive assembly 6. The driven sprocket in the second chain drive assembly 7 is coaxially and fixedly connected to the driving connecting sprocket in the third chain drive assembly 8. The driving sprocket in the first chain drive assembly 6 is coaxially and fixedly connected to the first traveling wheel 51. The driven sprocket in the third chain drive assembly 8 is coaxially and fixedly connected to the driving roller 42. Due to structural limitations, the first traveling wheel 51 is preferably located in the middle of the high-clearance fruit collection box 1, while the driving roller 42 is preferably located at the rear of the high-clearance fruit collection box 1 to ensure sufficient storage space. The second chain drive assembly 7 compensates for the difference in distance between the first traveling wheel 51 and the driving roller 42.
[0038] The drive unit includes a fourth chain drive assembly 9 and a tension wheel assembly 10. A flange 26 is coaxially fixed to a frame ring 24 in the harvesting device 2. The driven sprocket in the fourth chain drive assembly 9 is coaxially fixed to the flange 26. Its driving connecting wheel is rotatably installed at the rear of the high-clearance fruit collection box 1 and is coaxially fixed to the driving sprocket in the third chain drive assembly 8 via a connecting shaft 11. With this design, the flange 26 and the frame ring 24 are preferably fixed together by several mounting rods 27. The flange 26 facilitates the connection between the harvesting device 2 and the drive unit. The drive unit uses the rotation of the first traveling wheel 51 to provide rotational power. That is, the rotation of the first traveling wheel 51 drives the third chain drive assembly 8 and the fourth chain drive assembly 9 to move synchronously, thereby realizing the movement of the traction equipment and synchronously driving the conveying device 4 and the harvesting device 2. Compared with the existing structure of the conveying device 4 and the harvesting device 2 with separate drive mechanisms, energy consumption is greatly reduced. Since the frame 3 and the high-clearance fruit collection box 1 are rotatably connected, the harvesting device 2 will change position with the height of the second traveling wheel 52 when the ground is uneven. The tension of the chain in the fourth chain drive assembly 9 can be adjusted in real time by setting a tension wheel to prevent the chain from disengaging. In order to prevent the fruit inside the high-clearance fruit collection box 1 from being crushed or from hindering the operation of each chain drive assembly, the chain drive assembly and connecting shaft 11 located inside the high-clearance fruit collection box 1 are covered with a protective cover.
[0039] The tensioning wheel assembly 10 includes a tensioning sprocket 101, a second mounting bracket 102, a fixed rod 103, a movable rod 104, and a spring 105. The second mounting bracket 102 is fixedly mounted to the rear end of the high-clearance fruit collection box 1. The fixed rod 103 is vertically fixed to the bottom end of the second mounting bracket 102. One end of the movable rod 104 is hinged to the bottom end of the fixed rod 103. The tensioning sprocket 101 is rotatably mounted on the other end of the movable rod 104. The spring 105 connects the other end of the movable rod 104 to the top end of the fixed rod 103. This design allows for real-time adjustment of the chain tension in the fourth chain drive assembly 9 through the tension of the spring 105.
[0040] The arc-shaped limiting grid 22 adopts a semi-circular structure, and its axial length is less than the distance between the two frame rings 24. This design, with its semi-circular structure, effectively increases the distance between the bottom arc-shaped limiting grid 22 and the picking unit 25, thus preventing the pineapple from being unable to be smoothly lifted to the target height after picking, which would prevent the pineapple fruit from falling onto the slide plate 21 for subsequent collection.
[0041] The skateboard 21 has a cushioning layer inside and a tilt angle of 30°. This design effectively reduces the impact when the pineapple falls. The 30° tilt angle allows the pineapple to roll more smoothly and quickly.
[0042] There are two harvesting devices 2 arranged side by side.
[0043] The harvesting unit 25 includes an L-shaped harvesting component and a limiting component, wherein the harvesting component and the limiting component are either mesh-like structures or comb-like structures. This design allows for tangential harvesting via the harvesting component and prevents the pineapple fruit from falling off the fruit via the limiting component. Furthermore, when the harvesting component uses a mesh-like structure, damage to the pineapple fruit can be further reduced.
[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A pineapple harvesting device with adjustable harvesting frequency, characterized in that: The system includes a high-clearance fruit collection box (1), a harvesting device (2), a frame (3), a conveying device (4), and a walking device. The high-clearance fruit collection box (1) is connected to the rear of the traction equipment. One end of the frame (3) is rotatably mounted on the rear end of the high-clearance fruit collection box (1). The harvesting device (2) is rotatably mounted on the frame (3). The conveying device (4) is fixed on the frame (3), with one end located on the fruit outlet side of the harvesting device (2) and the other end rotatably mounted on the rear of the high-clearance fruit collection box (1). Walking devices are provided at the bottom of both the high-clearance fruit collection box (1) and the bottom of the frame (3). The harvesting device (2) includes a harvesting body and a sliding plate (21) and an arc-shaped limiting grid (22) located inside the harvesting body. The harvesting body includes two coaxially arranged frame rings (24) and a number of harvesting units (25) arranged circumferentially between the two frame rings (24). One of the frame rings (24) is connected to the driving device. Each frame ring (24) has a number of arc-shaped slides (241) opened circumferentially on it. The number of harvesting units (25) are connected to the arc-shaped slides (241) on both sides of it by bolts. The slide (21) is arranged at an angle and its lower end is fixed to the conveying device (4). The top of the arc-shaped limiting grid (22) is an open end and is fixed to the bottom of the slide (21) by the first mounting bracket (23). The arc-shaped limiting grid (22) limits the pineapple fruit in the picking unit (25) below it.
2. The pineapple harvesting device with adjustable harvesting frequency according to claim 1, characterized in that: The conveying device (4) includes an outer shell (41), an active roller (42) and a driven roller (43) disposed inside the outer shell (41), a base belt (44) fitted on the active roller (42) and the driven roller (43), and several transverse partitions (45) fixedly mounted on the surface of the base belt (44) along the length direction of the base belt (44). The lower end of the slide plate (21) is fixedly connected to the outer shell (41), and the active roller (42) is rotatably installed at the rear of the high ground clearance fruit collection box (1).
3. The pineapple harvesting device with adjustable harvesting frequency according to claim 2, characterized in that: The walking device includes two first walking wheels (51) installed below the high ground clearance fruit collection box (1) and two second walking wheels (52) installed below the frame (3). The drive roller (42) is connected to the first walking wheels (51) below it through a chain drive assembly.
4. A pineapple harvesting device with adjustable harvesting frequency according to claim 3, characterized in that: The chain drive assembly includes a first chain drive assembly (6), a second chain drive assembly (7), and a third chain drive assembly (8) connected in sequence. The second chain drive assembly (7) is rotatably installed inside the high ground clearance fruit collection box (1). The driving sprocket in the second chain drive assembly (7) is coaxially fixed to the driven sprocket in the first chain drive assembly (6). The driven sprocket in the second chain drive assembly (7) is coaxially fixed to the driving connecting wheel in the third chain drive assembly (8). The driving sprocket of the first chain drive assembly (6) is coaxially fixed to the first traveling wheel (51). The driven sprocket in the third chain drive assembly (8) is coaxially fixed to the driving roller (42).
5. A pineapple harvesting device with adjustable harvesting frequency according to claim 4, characterized in that: The drive device includes a fourth chain drive assembly (9) and a tension wheel assembly (10). A frame ring (24) in the picking device (2) is coaxially fixed with a flange (26). The driven sprocket in the fourth chain drive assembly (9) is coaxially fixed with the flange (26). Its driving connecting wheel is rotatably installed at the rear of the high ground clearance fruit collection box (1) and is coaxially fixed with the driving sprocket in the third chain drive assembly (8) through a connecting shaft (11).
6. A pineapple harvesting device with adjustable harvesting frequency according to claim 5, characterized in that: The tensioning wheel assembly (10) includes a tensioning sprocket (101), a second mounting bracket (102), a fixed rod (103), a movable rod (104), and a spring (105). The second mounting bracket (102) is fixedly mounted on the rear end of the high ground clearance fruit collection box (1). The fixed rod (103) is vertically fixed to the bottom end of the second mounting bracket (102). One end of the movable rod (104) is hinged to the bottom end of the fixed rod (103). The tensioning sprocket (101) is rotatably mounted on the other end of the movable rod (104). The spring (105) is connected between the other end of the movable rod (104) and the top end of the fixed rod (103).
7. A pineapple harvesting device with adjustable harvesting frequency according to claim 1, characterized in that: The arc-shaped limiting grid (22) adopts a semi-circular structure, and its axial length is less than the distance between the two frame rings (24).
8. A pineapple harvesting device with adjustable harvesting frequency according to claim 1, characterized in that: The skateboard (21) has a buffer layer inside and the tilt angle of the skateboard (21) is 30°.
9. A pineapple harvesting device with adjustable harvesting frequency according to claim 1, characterized in that: There are two harvesting devices (2) arranged side by side.
10. A pineapple harvesting device with adjustable harvesting frequency according to claim 1, characterized in that: The picking unit (25) includes a picking component and a limiting component arranged in an L-shape, wherein the picking component and the limiting component are respectively a mesh-like structure or a comb-like structure.