Equal contact stress clamping and conveying device

Abstract

The present invention discloses an equal contact stress clamping and conveying device, comprising two groups of symmetrically arranged conveying mechanisms on the left and right, each group of conveying mechanisms comprising a pair of driving rollers and driven rollers arranged front and back, a conveyor belt surrounding the outside of the driving and driven rollers, an air bag body arranged on the outside of the conveyor belt, mutually connected vents arranged on the conveyor belt and the air bag body, a supporting air duct in the conveyor belt, the supporting air duct is used to inflate the air bag body while supporting the conveyor belt, and the supporting air duct is connected to an air source. When harvesting different varieties of vegetables, the present invention can adjust the clamping contact stress by adjusting the air pressure, thereby improving versatility. Since the air bag body can have a larger deformation size, it can adapt to a larger range of stem sizes or feeding amounts, thereby improving versatility.

Description

Technical Field

[0001] The invention relates to a vegetable harvesting device, in particular to an equal contact stress clamping and conveying device. Background Art

[0002] The orderly harvesting of stem and leaf vegetables generally adopts flexible clamping conveyor belts to complete the orderly collection and transportation of vegetables, such as patents CN201621390378.8, CN201910159271.4, CN201821348199.7, and CN201910127937.8. Their basic structures are two relative flexible conveyor belts running in the same direction, and the end support rollers and the middle floating rollers are used to make the conveyor belts pre-tensioned, such as Figure 1 When the vegetable stems are located between the two flexible conveyor belts, the conveyor belts bend and deform. At this time, the tension of the conveyor belts can apply pressure to the stems to generate a clamping force. Since the bending deformation angles of the flexible belts are different when the size of the vegetable stems changes, or when the clamping and conveying are at different positions, the clamping force of the conveyor belt on the vegetable stems varies. In addition, since the stems of leafy vegetables are weak and fragile, excessive clamping force will cause the stems and leaves to crack, while excessive clamping force will cause the vegetables to fall off. Therefore, the appropriate clamping force range for each vegetable is different and relatively small. Therefore, the existing clamping and conveying mechanism is difficult to adapt to work environments with large changes in stem size due to the uneven clamping force, resulting in a high damage rate. At the same time, the structure of the prior art needs to be adjusted when used between different varieties of vegetables, and has poor versatility. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide an equal contact stress clamping and conveying device which has good versatility and will not cause damage to vegetables.

[0004] A constant contact stress clamping conveying device includes two groups of symmetrically arranged conveying mechanisms on the left and right, each group of conveying mechanisms includes a pair of active rollers and driven rollers arranged front and back, a conveyor belt surrounding the outside of the active and driven rollers, an air bag body is arranged on the outside of the conveyor belt, and mutually connected air holes are arranged on the conveyor belt and the air bag body. A supporting air duct is arranged in the cavity surrounded by the conveyor belt and the active and driven rollers. The supporting air duct is used to inflate the air bag body while supporting the conveyor belt. An air outlet that communicates with the conveyor belt and the air holes on the air bag body is arranged on the clamping side of the supporting air duct facing the adjacent conveying mechanism. A front pressure roller and a rear pressure roller that press the air bag body against the conveyor belt and can rotate themselves are also arranged at both ends of the conveying mechanism, and the supporting air duct is connected to an air source.

[0005] The equal contact stress clamping and conveying device of the present invention connects the supporting air duct with the compressed air source, and the compressed gas enters the supporting air duct, and then enters the air bag body through the air outlet on the supporting air duct through the conveyor belt and the air vents on the air bag body to make the air bag body swell and fill. When the two symmetrical air bags are filled to contact each other, the contact reaction force makes the conveyor belt close to the supporting air duct. Since the contact surface of the conveyor belt and the supporting air duct is a smooth surface with a large contact area, a better sealing surface can be formed to reduce gas leakage. When the input compressed gas flow rate is equal to the leakage gas flow rate, an air cushion with stable air pressure can be formed inside the air bag body at that location. Due to the softness of the air bag body, the vegetable stems and leaves clamped and conveyed by the air bags on both sides are subjected to the clamping contact stress of the compressed air pressure regardless of their size. Driven by the active rollers on both sides at opposite and equal speeds, the two symmetrical conveyor belts and the airbags connected thereto run at the same speed and in the same direction. At this time, the vegetables fed at the entrance can be conveyed backwards by clamping their stems through the airbags. When the airbags and the conveyor belts enter the non-clamping side, due to the squeezing and sealing effect of the rotatable front and rear pressure rollers at both ends and the air vents in this section are connected to the atmosphere, there is no compressed air in its cavity and the airbags are in a flat state.

[0006] The specific method of arranging the airbag body on the outer side of the conveyor belt is: the conveyor belt and the airbag body are fixedly connected to form an integrated structure.

[0007] The fixed connection between the conveyor belt and the airbag body is to glue the two together.

[0008] The specific method of arranging the airbag body outside the conveyor belt may also be: the conveyor belt and the airbag body are connected together in a detachable manner.

[0009] The conveyor belt and the airbag body are connected in a detachable manner, and the conveyor belt or the airbag body can be flexibly replaced separately according to needs.

[0010] The conveyor belt and the airbag body can be detachably connected by connecting the two by means of adhesive buckles, concealed buckles, etc.

[0011] The vent holes on the conveyor belt and the airbag body are either arranged at the connection between the two or are connected through a connecting piece.

[0012] The supporting air guide tube is a rectangular tube.

[0013] The use of a rectangular supporting air guide tube can make the contact surface of the conveyor belt more closely fitted during operation, thereby forming a better sealing surface and reducing gas leakage.

[0014] The air outlet on the supporting air guide pipe is a long slot-shaped air outlet.

[0015] The air outlet on the supporting air guide tube is arranged to be a long groove-shaped structure, which is more conducive to the gas on the supporting air guide tube to enter the airbag body.

[0016] The airbag body is a flexible rubber airbag body.

[0017] The air bag body of this structure is not easy to damage vegetables.

[0018] In summary, the present invention has the following advantages over the prior art:

[0019] 1. Since the clamping contact stress between the clamping conveying mechanism and the stem is equal to the compressed air pressure, the clamping force is the product of the air pressure and the contact area. When the stem size increases, the clamping force increases accordingly. Therefore, the clamping force is stable during the conveying process and can be adaptively adjusted according to the stem size, which can effectively reduce damage.

[0020] 2. When harvesting different varieties of vegetables, the clamping contact stress can be adjusted by adjusting the air pressure, thereby improving versatility.

[0021] 3. Since the airbag can have a larger deformation size, it can adapt to a wider range of stem sizes or feed amounts, which can improve versatility.

[0022] 4. As the feeding port has a large width, it is convenient for row alignment during harvesting and reduces the precision requirements for row alignment.

[0023] 5. Since the airbag on the non-clamping side is in a flat state, the width of the clamping and conveying mechanism is reduced, and the row spacing can be reduced when harvesting multiple rows, so that harvesting operations can also be carried out on vegetable varieties with smaller row spacing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the clamping and conveying mechanism of the prior art.

[0025] Figure 2 It is a top view schematic diagram of the clamping and conveying device of the present invention.

[0026] Figure 3 yes Figure 2 BB schematic diagram.

[0027] Figure 4 yes Figure 3 AA section view.

[0028] Description of Reference Numerals 1 front pressure roller 2 air bag body 3 conveyor belt 4 driven roller 5 supporting air duct 6 frame 7 supporting air inlet interface of air duct 8 driving roller 9 rear pressure roller DETAILED DESCRIPTION

[0029] The present invention is described in more detail below with reference to the embodiments.

[0030] Example 1

[0031] An equal contact stress clamping and conveying device, such as Figure 2-4 As shown, the middle of the contact part of the airbag body 2 and the conveyor belt 3 is connected as a whole by gluing or other sealing and fastening methods, and a plurality of vents are arranged at the connection part, so that the inner cavity of the airbag body 2 is connected to the outside through the vents; the clamping belt composed of the airbag body 2 and the conveyor belt 3 surrounds the outside of the driven roller 4, the supporting air duct 5, and the active roller 8, and the airbag body 2 is pressed against the conveyor belt 3 by the rotatable front pressure roller 1 and the rear pressure roller 9 at both ends, so that the internal space of the airbag body 2 is divided into two cavities. The supporting air duct 5 is a rectangular tubular structure with closed ends and a hollow interior, and an air inlet interface 7 is connected to its bottom, and a long slot-shaped air outlet is arranged in the middle position facing the clamping surface, and the height of the air outlet is consistent with the height of the vent on the clamping belt. After the compressed air is passed into the supporting air duct 5 from the air inlet interface 7, it is injected into the cavity between the front pressure roller 1 and the rear pressure roller 9 on the clamping surface of the airbag body 2 through the long groove-shaped air outlet and the air vent to make it swell and fill. When the two symmetrical airbag bodies are filled to contact each other, their contact reaction force makes the conveyor belt 3 close to the supporting air duct 5. Since the contact surface between the conveyor belt 3 and the supporting air duct 5 is a smooth surface with a large contact area, a better sealing surface can be formed to reduce gas leakage. When the input compressed gas flow rate is equal to the leakage gas flow rate, an air cushion with stable air pressure can be formed inside the airbag body at that location. Since the airbag body 2 is made of a soft rubber material with extremely low rigidity, the vegetable stems and leaves clamped and transported by the airbags on both sides, regardless of their size, are subjected to the clamping contact stress of the compressed air.

[0032] Driven by the active rollers on both sides at opposite and equal speeds, the two symmetrical conveyor belts 3 and the airbag bodies 2 connected thereto run at the same speed and in the same direction. At this time, the vegetables fed at the entrance can be conveyed backward by clamping their stems through the airbag bodies 2. When the airbag bodies 2 and the conveyor belts 3 enter the non-clamping side, due to the squeezing and sealing effect of the rotatable front pressure rollers 1 and rear pressure rollers 9 at both ends, and the air vents in this section are connected to the atmosphere, there is no compressed air in its cavity, and at this time the airbag body 2 is in a flat state.

[0033] Rack 6.

[0034] The parts not described in this embodiment are the same as those in the prior art.

Claims

1. An equal contact stress clamping and conveying device, comprising two groups of symmetrically arranged conveying mechanisms on the left and right, characterized in that: Each group of conveying mechanisms includes a pair of active rollers and driven rollers arranged in front and behind, a conveyor belt surrounding the main and driven rollers, an air bag body is arranged on the outside of the conveyor belt, and mutually connected air holes are arranged on the conveyor belt and the air bag body. A supporting air duct is arranged in the cavity surrounded by the conveyor belt and the main and driven rollers. The supporting air duct is used to inflate the air bag body while supporting the conveyor belt. An air outlet communicating with the conveyor belt and the air holes on the air bag body is arranged on the clamping side of the supporting air duct facing the adjacent conveying mechanism. A front pressure roller and a rear pressure roller that press the air bag body against the conveyor belt and can rotate themselves are also arranged at both ends of the conveying mechanism. The supporting air duct is connected to the air source.

2. The equal contact stress clamping and conveying device according to claim 1, characterized in that: The specific method of arranging the airbag body on the outer side of the conveyor belt is: the conveyor belt and the airbag body are fixedly connected to form an integrated structure.

3. The equal contact stress clamping and conveying device according to claim 1, characterized in that: The specific method of arranging the airbag body on the outer side of the conveyor belt is: the conveyor belt and the airbag body are connected together in a detachable manner.

4. The equal contact stress clamping and conveying device according to claim 2 or 3, characterized in that: The vent holes on the conveyor belt and the airbag body are either arranged at the connection between the two or are connected through a connecting piece.

5. The equal contact stress clamping and conveying device according to claim 4, characterized in that: The supporting air guide tube is a rectangular tube.

6. The equal contact stress clamping and conveying device according to claim 5, characterized in that: The air outlet on the supporting air guide pipe is a long slot-shaped air outlet.

7. The equal contact stress clamping and conveying device according to claim 6, characterized in that: The airbag body is a flexible rubber airbag body.

Images