CN211430029U - Pneumatic type seed metering device - Google Patents

Abstract

The utility model belongs to a pneumatic type seed metering device. The pneumatic seed metering device consists of an elastic membrane, a suction head, a variable pressure cylinder with a vent hole, a piston and a direct current electromagnet, wherein the variable pressure cylinder is a cylindrical cylinder body with a through front end surface and a through rear end surface, the vent hole is formed in the side wall of the rear end of the variable pressure cylinder, the rear end surface of the suction head seals the front end surface of the variable pressure cylinder, a through hole is formed in the center of the suction head, the cross-sectional dimension of the through hole is larger than the maximum cross-sectional dimension of a seed, the front end surface of the suction head is covered with the elastic membrane, the elastic membrane is bonded with the end surface of the suction head, the piston made of a permanent magnetic material is slidably arranged in the variable pressure cylinder, one end of the piston is an N pole, the other end of the piston is an S pole, the direct current electromagnet is. The utility model has the advantages of simple structure, small volume, good stability, convenient use, low manufacturing cost and good use effect.

Description

Pneumatic type seed metering device

Technical Field

The utility model belongs to a pneumatic type seed metering device.

Background

The suction nozzle of the pneumatic seeding unit used at present is a through hole with various sections, and air is always blown out or sucked in the through hole during operation. Some seed sowing devices are provided with a single vacuum pump, wherein negative pressure is connected during seed taking and is separated from the negative pressure of the vacuum pump during seed sowing. Some seed sowing devices are provided with a vacuum pump and an air pump, wherein negative pressure is connected during seed taking, and positive pressure is connected during seed sowing. No matter what kind of air source is equipped, even if the seeds are adsorbed at the end of the through hole, a large amount of air with a certain vacuum degree or a certain pressure flows through. And therefore consumes energy.

In order to drive the air source with a considerable vacuum degree or positive pressure, the power of the output shaft of the tractor is utilized at present. The seeding machine is mainly adjustable in line number, and each line of ridging, ditching, seeding, earthing and pressing forms a relatively independent structural unit. When the number of rows is adjusted, such units are increased or decreased. The air source driven by the rear axle of the tractor supplies positive pressure or negative pressure air for the plurality of seed sowing gases. When the number of rows is adjusted, the source of the gas is not generally replaced. When the number of rows is small, the power of the tractor is also large. The seed taking and seeding structure adopting the vacuum pump or the air pump is complex, large in volume, poor in stability, inconvenient to use and high in manufacturing cost.

Disclosure of Invention

The utility model aims at designing a pneumatic type seed metering device, having simple structure, small, stability is good, convenient to use and low in manufacturing cost and excellent in use effect's advantage.

Therefore, the utility model discloses a suction head, wherein: the pneumatic seeding device consists of an elastic membrane, a suction head, a pressure-changing cylinder with a vent hole, a piston and a direct current electromagnet. The variable pressure cylinder is a cylindrical cylinder body with a through front end surface and a through rear end surface, the side wall of the rear end of the variable pressure cylinder is provided with a vent hole, the rear end surface of the suction head seals the front end surface of the variable pressure cylinder, the center of the suction head is provided with a through hole, the cross section size of the through hole is larger than the maximum cross section size of the seeds, the front end surface of the suction head is covered with an elastic membrane, the elastic membrane is glued with the end surface of the suction head, a piston made of permanent magnetic material is arranged in the variable pressure cylinder in a sliding mode, one end of the piston is an N pole, the other end of the piston is an S pole, a direct current electromagnet is arranged on the lower end surface of.

Or the pneumatic seed metering device is composed of an elastic membrane, a suction head, a variable pressure cylinder with a vent hole, a piston, a direct current electromagnet and a reset spring, wherein the variable pressure cylinder is a cylindrical cylinder body with a through front end surface and a through rear end surface, the vent hole is formed in the side wall of the rear end of the variable pressure cylinder, the rear end surface of the suction head seals the front end surface of the variable pressure cylinder, a through hole is formed in the center of the suction head, the cross-sectional dimension of the through hole is larger than the maximum cross-sectional dimension of seeds, the front end surface of the suction head covers the elastic membrane, the elastic membrane is in adhesive joint with the end surface of the suction head, the piston made of a ferrous material is in sliding fit in the variable pressure cylinder, the direct current electromagnet is installed on the lower end surface of the variable pressure cylinder, direct current is applied to.

The suction head is in a round table shape. The inner wall of the pressure changing cylinder is coated with lubricating oil.

The structure achieves the purpose of the utility model.

The utility model has the advantages of simple structure, small volume, good stability, convenient use, low manufacturing cost and good use effect. The utility model discloses regard as drive piston power simple structure with direct current electromagnet's coil, it is small, stability is good, convenient to use and low in manufacturing cost. The utility model discloses can borrow and draw the film in the instantaneous inner chamber negative pressure in the transformer cylinder, the seed is wrapped up in with flexible film to the back, and the air consumption is very little, and the negative pressure is low, can be when the seed metering, and the inner chamber needs instantaneous malleation, extrapolates the film, unloads the seed. Therefore, the power for generating the positive and negative pressures is also small. Ensure the whole seed taking mechanism to be small. The utility model discloses abandoned traditional output shaft, air pump system, only need be equipped with small and exquisite air supply alone for every seed metering unit, really realize modular structure, reduce the complete machine volume of planting, favourable hang and transition.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the cross-sectional structure a-a in fig. 1.

Fig. 3 is a schematic structural diagram of another embodiment of the present invention.

Detailed description of the preferred embodiments

Example 1: as shown in fig. 1 to 2, a pneumatic seed metering device, a closed pneumatic seed metering device, includes: the device comprises an elastic membrane 1, a suction head 2, a transformation cylinder 4 with a vent hole 3, a piston 5 and a direct current electromagnet 6. The suction head is used for absorbing seeds 7, a through hole is formed in the center of the suction head, and the section size of the through hole is larger than the maximum section size of the seeds. One end surface of the suction head is covered with an elastic membrane, the elastic membrane is glued with the front end surface of the suction head, and the glued part has air tightness and certain mechanical strength. The other end surface of the suction head is rigidly connected with the pressure changing cylinder, and the joint has air tightness. The pressure changing cylinder is a cylindrical cylinder body with a through hole in the center. A piston made of permanent magnetic material is arranged in the pressure changing cylinder in a sliding mode, one end of the piston is an N pole, and the other end of the piston is a pole. The piston and the pressure-changing cylinder are in sliding fit with a small gap, and lubricating oil can be used for ensuring certain air tightness.

The rear end of the transformer cylinder is provided with a direct current electromagnet 6. And direct current is applied to two ends of a coil of the direct current electromagnet. The polarity of the voltage can be changed as required, which is a conventional technique and will not be described in detail. The suction head is in a round table shape. The inner wall of the pressure changing cylinder is coated with lubricating oil.

During the use, the one end that covers the pneumatic seed metering ware of closed is close to seed 7, presses close to, adds direct current voltage for direct current electromagnet, and direct current electromagnet produces and the 5 opposite magnetism of polarity of piston, attracts the piston to keep away from elastic membrane 1, because the negative pressure, elastic membrane 1 invaginates, and instantaneous negative pressure and the film that caves in snatch the seed to keep the seed on the elastic membrane that caves in. After the suction head 2 is moved to the position for unloading the seeds 7, reverse voltage is applied to the direct current electromagnet, the polarity of the direct current electromagnet is changed, the piston is pushed to reset, negative pressure at one end, close to the elastic membrane, in the pressure changing cylinder disappears, the elastic membrane resets, and the seeds are pushed and unloaded.

Example 2: as shown in figure 3, the pneumatic seeding device consists of an elastic membrane 1, a suction head 2, a pressure-changing cylinder 4 with a vent hole 3, a piston 5, a direct current electromagnet 6 and a return spring 8. The variable pressure cylinder is a cylindrical cylinder body with a through front end surface and a through rear end surface, the side wall of the rear end of the variable pressure cylinder is provided with a vent hole, the rear end surface of the suction head seals the front end surface of the variable pressure cylinder, the center of the suction head is provided with a through hole, and the section size of the through hole is larger than the maximum section size of the seeds 7. The front end face of the suction head is covered with an elastic film, the elastic film is glued with the end face of the suction head, a piston made of iron material is arranged in a transformation cylinder in a sliding mode, a direct current electromagnet is arranged on the lower end face of the transformation cylinder, direct current is applied to two ends of a coil of the direct current electromagnet, and a reset spring 8 is arranged in the transformation cylinder between the lower end face of the piston and the upper end face of the direct current electromagnet. The suction head is in a round table shape. The inner wall of the pressure changing cylinder is coated with lubricating oil.

During the use, the one end that covers the pneumatic seed metering ware of closed is close to seed 7, presses close to, adds direct current voltage for direct current electromagnet, and the magnetism that direct current electromagnet produced attracts the piston to keep away from elastic membrane 1, and the piston is close to the process to direct current electromagnet, and oppression reset spring contracts, because the negative pressure, elastic membrane 1 invaginates, and instantaneous negative pressure and the film that caves in snatch the seed to keep the seed on the elastic membrane that caves in. After the suction head 2 is moved to the position for unloading the seeds 7, the power supply of the direct current electromagnet is stopped, the direct current electromagnet loses the magnetism of the attraction piston, the return spring 8 stretches to push the piston to return, the negative pressure close to one end of the elastic membrane in the pressure changing cylinder disappears, the elastic membrane returns, and the seeds are pushed and unloaded.

In a word, the utility model has the advantages of simple structure, small, stability is good, convenient to use and low in manufacturing cost and excellent in use effect.

Claims (3)

1. The utility model provides a pneumatic type seed metering device, includes suction head, its characterized in that:

the pneumatic seed metering device consists of an elastic membrane, a suction head, a variable pressure cylinder with a vent hole, a piston and a direct current electromagnet, wherein the variable pressure cylinder is a cylindrical cylinder body with a through front end surface and a through rear end surface, the vent hole is formed in the side wall of the rear end of the variable pressure cylinder, the rear end surface of the suction head seals the front end surface of the variable pressure cylinder, a through hole is formed in the center of the suction head, the cross-sectional dimension of the through hole is larger than the maximum cross-sectional dimension of a seed, the front end surface of the suction head covers the elastic membrane, the elastic membrane is bonded with the end surface of the suction head, the piston made of a permanent magnetic material is slidably matched in the variable pressure cylinder, one end of the piston is an N pole, the other end of the piston is an S pole, the direct current electromagnet is installed on;

or the pneumatic seed metering device is composed of an elastic membrane, a suction head, a variable pressure cylinder with a vent hole, a piston, a direct current electromagnet and a reset spring, wherein the variable pressure cylinder is a cylindrical cylinder body with a through front end surface and a through rear end surface, the vent hole is formed in the side wall of the rear end of the variable pressure cylinder, the rear end surface of the suction head seals the front end surface of the variable pressure cylinder, a through hole is formed in the center of the suction head, the cross-sectional dimension of the through hole is larger than the maximum cross-sectional dimension of seeds, the front end surface of the suction head covers the elastic membrane, the elastic membrane is in adhesive joint with the end surface of the suction head, the piston made of a ferrous material is in sliding fit in the variable pressure cylinder, the direct current electromagnet is installed on the lower end surface of the variable pressure cylinder, direct current is applied to.

2. A pneumatic seed metering device as claimed in claim 1, in which: the suction head is in a round table shape.

3. A pneumatic seed metering device as claimed in claim 1, in which: the inner wall of the pressure changing cylinder is coated with lubricating oil.

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