A multi-row seeder with a pressure stabilizing mechanism

Abstract

The application discloses a multi-row seeder with a pressure stabilizing mechanism, a rack is provided with an air flow supply system and a plurality of seeding units, the seeding units comprise pneumatic seeders; the air flow supply system comprises an air flow generator, a pressure stabilizing mechanism and a controller; the pressure stabilizing mechanism is equal in number to the pneumatic seeders and is connected one by one in a corresponding manner; the air flow generator is connected with each pressure stabilizing mechanism respectively; the pressure stabilizing mechanism is provided with a pressure stabilizing tank body and a piston slidingly installed in the pressure stabilizing tank body, and further comprises a first spring acting on the piston; the air flow supply system further comprises a sensing device, the sensing device comprises pull wires connected with the pistons, all the pull wires are connected with a sliding piece, further comprises a second spring acting on the sliding piece, and a displacement sensor for detecting displacement of the sliding piece, and the displacement sensor is connected with the controller. The application has the advantages of simple structure, low cost, intelligent adjustment of air source pressure, and significant reduction of the use of sensors and electrically-controlled pressure regulating devices.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of agricultural seeding machinery, in particular to a multi-row seeder with a pressure stabilizing mechanism. BACKGROUND

[0002] Pneumatic seeders play a crucial role in modern agricultural production, and their performance directly affects the stability of seeding quality and crop yield. However, existing pneumatic seeders still have some technical problems in the air supply system that need to be solved. These problems mainly manifest in the large fluctuations of the air pressure of the seed metering device, and the inability of the air supply system to effectively compensate for air pressure. Specifically, during the seeding operation, the air pressure of the seed metering device is prone to fluctuation, which significantly affects the accuracy and uniformity of seed distribution, thereby reducing the quality of seeding.

[0003] To solve the above problems, some improvement schemes have been proposed in the prior art. For example, patent application CN 109819726 A discloses a stable air supply system for a pneumatic seeder. This technology adds a pressure stabilizing tank and an air pressure compensation device to improve the stability of the air supply system, reduce the fluctuation of the air pressure of the seed metering device, and improve the uniformity of air distribution. In addition, an overflow valve is installed on the air supply pipeline to release excess gas when the air supply pressure is too high, thereby maintaining stable system pressure. However, in order to achieve the above purposes, this patent needs to install an air pressure sensor and an overflow valve on each pressure stabilizing tank, which increases the cost of use, increases the complexity of wiring, and increases the failure rate.

[0004] In addition, patent CN 113427690 A contains a pressure stabilizer, which buffers and stabilizes the changing air flow by setting a partition and a pressure stabilizing spring in the shell of the pressure stabilizer. In this device, the range of action of the pressure stabilizing device is limited and cannot meet the generation of air pressure changes in a larger range. SUMMARY

[0005] The present application provides a multi-row seeder with a pressure stabilizing mechanism that is simple in structure, low in cost, combines mechanical pressure stabilization and electronic pressure regulation, and can effectively stabilize the pressure of a multi-row seeding device.

[0006] Technical solution: To achieve the above-mentioned purpose, the multi-row seeder with pressure stabilizing mechanism of the application comprises a rack, an air flow supply system and a plurality of seeding units are installed on the rack, the seeding units comprise pneumatic seeders; the air flow supply system comprises an air flow generator, a pressure stabilizing mechanism and a controller, the controller can regulate the air pressure generated by the air flow generator; the pressure stabilizing mechanism and the pneumatic seeders are equal in number and are connected one by one, the pressure stabilizing mechanism and the corresponding pneumatic seeder are connected through a second air pipe; the air flow generator is connected with each pressure stabilizing mechanism through a first air pipe.

[0007] The pressure stabilizing mechanism has a pressure stabilizing tank body and a piston slidingly installed in the pressure stabilizing tank body, and further comprises a first spring acting on the piston; the piston separates the internal space of the pressure stabilizing tank body into a working space connected with the first air pipe and the second air pipe; the other side of the piston is in communication with the atmosphere;

[0008] The air flow supply system further comprises a sensing device, the sensing device comprises a pull wire connected with each piston, all the pull wires are connected with a sliding member, further comprises a second spring acting on the sliding member, and a displacement sensor for detecting the displacement of the sliding member, the displacement sensor is connected with the controller.

[0009] In use, on the one hand, each pressure stabilizing mechanism operates independently and can respectively play a pressure stabilizing role, specifically: when the air pressure generated by the air flow connected with the first air pipe increases, the piston slides relative to the pressure stabilizing tank body to make the first spring compressed, and the working space increases to reduce the air pressure; when the air pressure generated by the air flow connected with the first air pipe decreases, the piston slides relative to the pressure stabilizing tank body under the pushing action of the first spring, and the working space decreases to increase the air pressure.

[0010] On the other hand, all the pull wires connected with the pistons act on the sliding member to make the sliding member produce a comprehensive displacement, the comprehensive displacement can reflect the average value of the air pressure of the air flow delivered to each pneumatic seeder, and the controller can adjust the operation of the air flow generator according to the average value to timely adjust the air pressure to meet the operation requirements.

[0011] Further, the outer side of each pull wire is sleeved with a flexible sleeve, and the two ends of the flexible sleeve are respectively fixed relative to the pressure stabilizing tank body and the sliding member.

[0012] Further, the sensing device further comprises a device seat body, a sliding rail is installed on the device seat body, and a sliding block cooperating with the sliding rail is installed on the sliding member; the active unit of the displacement sensor is connected with the sliding member.

[0013] The relative sliding direction of the device seat body and the sliding member is horizontal direction, and both have a vertically arranged first plate part and a second plate part, and the second spring is arranged between the first plate part and the second plate part.

[0014] Further, the device seat body has a number of notches corresponding to the flexible sleeves, all the notches are arranged in a straight line, and the notches are arranged on the first plate part; the two ends of the flexible sleeve are provided with fixing members, the fixing members have thin threaded segments and thick blocking parts; the threaded segment of the fixing member at one end is embedded in the notch, and a fixing nut is screwed on the threaded segment.

[0015] Further, the end of the pressure stabilizing tank body is provided with a clamping groove and a circular hole communicating with the clamping groove, the diameter of the circular hole is greater than the width of the clamping groove; the threaded segment of the fixing member at the other end of the flexible sleeve is embedded in the clamping groove, and a fixing nut is screwed on the threaded segment to fix the fixing member.

[0016] When the fixing member of the pressure stabilizing tank body is disassembled and connected, the blocking part of the fixing member can be in and out of the circular hole.

[0017] Further, the piston is provided with a conical hole, and a stopper cooperating with the conical hole is mounted on the piston, a guide shaft is fixed on the stopper, an end of the guide shaft is fixed with a baffle, a third spring is sleeved on the guide shaft, and the two ends of the third spring are respectively abutted against the piston and the baffle.

[0018] With the above structure, under normal conditions, when the air pressure in the pressure stabilizing mechanism approaches the target air pressure, there is a gap between the end of the baffle and the inner wall of the pressure stabilizing tank body. When the air pressure in the pressure stabilizing tank body increases, the air pressure first drives the piston to move for buffering, when the air pressure is too large, the piston is driven to a specific position so that the baffle contacts the inner wall of the pressure stabilizing tank body, and then the air pressure continues to drive the piston to compress the first spring to move, so that the conical hole is opened for pressure relief, so that the air pressure does not exceed a certain value, preventing the air pressure from being too large to affect the operation of the pneumatic seed meter. On the other hand, the controller adjusts the operation of the airflow generator to reduce the air pressure so that the pressure stabilizing mechanism returns to the normal state.

[0019] Beneficial effects: the multi-row seeder with a pressure stabilizing mechanism has the following beneficial effects:

[0020] (1) By arranging the sensing device which combines mechanical structure and displacement sensor, the displacement value generated by the displacement sensor can fully reflect the comprehensive air pressure value of all pressure stabilizing mechanisms, and the controller adjusts the airflow generator to effectively adjust the air pressure of all pneumatic seed meters, compared with the prior art, the use of sensors and electric control pressure regulating devices can be significantly reduced, the cost is reduced, the complex wiring is avoided, and the failure rate is reduced.

[0021] (2) The connection mode design of the pull wire and the sleeve can reduce the wiring difficulty of the pull wire, make the pull wire freely bend, accurately transfer the displacement amount, and effectively convert the combined force of the multiple pull wires into the displacement of the sliding piece.

[0022] (3) By setting the conical hole and the elastic plug structure on the piston, automatic adjustment and protection of the air pressure in the pressure stabilizing mechanism can be realized. When the air pressure is too large, the piston moves to a specific position, the conical hole opens to automatically release pressure, preventing the air pressure from exceeding the limit value and protecting the normal operation of the pneumatic seed metering device. At the same time, the controller adjusts the air flow generator according to the air pressure change, so that the pressure stabilizing mechanism returns to the normal state. This design enhances the stability and reliability of the system, effectively reducing the impact of air pressure fluctuations on the operation of the seeding machine. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a side view of a multi-row seeder with a pressure stabilizing mechanism;

[0024] Figure 2 is a top view of a multi-row seeder with a pressure stabilizing mechanism;

[0025] Figure 3 is a perspective view of the pressure stabilizing mechanism;

[0026] Figure 4 is a sectional view of the pressure stabilizing mechanism;

[0027] Figure 5 is a side view of the sensing device;

[0028] Figure 6 is a perspective view of the sensing device.

[0029] In the figure: 1 - pneumatic seed metering device; 2 - air flow generator; 3 - pressure stabilizing mechanism; 31 - pressure stabilizing tank body; 31a - clamping groove; 31b - round hole; 32 - piston; 32a - conical hole; 33 - first spring; 34 - plug; 35 - guide shaft; 36 - baffle; 37 - third spring; 4 - sensing device; 41 - pull wire; 42 - sliding piece; 43 - displacement sensor; 44 - second spring; 45 - flexible sleeve; 46 - fixing piece; 47 - device seat body; 47a - slot; 48 - sliding rail; 49 - sliding block; 5 - first air pipe; 6 - second air pipe; A - machine frame; B - seeding unit; C - air flow supply system. DETAILED DESCRIPTION

[0030] The application will be further described below in conjunction with the drawings.

[0031] As Figure 1 With Figure 2The multi-row seeder with pressure stabilizing mechanism shown comprises a frame A, an air flow supply system C and a plurality of seeding units B mounted on the frame A, wherein the seeding units B comprise pneumatic seeders 1; the air flow supply system C comprises an air flow generator 2, pressure stabilizing mechanisms 3 and a controller capable of regulating the air pressure generated by the air flow generator 2; the pressure stabilizing mechanisms 3 are equal in number to the pneumatic seeders 1 and are connected one by one, and the pressure stabilizing mechanism 3 and the corresponding pneumatic seeder 1 are connected through a second air pipe 6; the air flow generator 2 is connected to each of the pressure stabilizing mechanisms 3 through a first air pipe 5.

[0032] As shown in Figure 3 With Figure 4 The pressure stabilizing mechanism 3 has a pressure stabilizing tank 31 and a piston 32 slidingly installed in the pressure stabilizing tank 31, and further comprises a first spring 33 acting on the piston 32; the piston 32 divides the internal space of the pressure stabilizing tank 31 into a working space connecting the first air pipe 5 and the second air pipe 6; the other side of the piston 32 is in communication with the atmosphere;

[0033] The air flow supply system C further comprises a sensing device 4, as shown in Figure 5 With Figure 6 The sensing device 4 comprises pull wires 41 connected to each of the pistons 32, all of the pull wires 41 are connected to a sliding piece 42, further comprises a second spring 44 acting on the sliding piece 42, and a displacement sensor 43 detecting the displacement of the sliding piece 42, the displacement sensor 43 is connected to the controller.

[0034] In use, on the one hand, each pressure stabilizing mechanism 3 operates independently and can respectively play a pressure stabilizing role, specifically: when the air pressure generated by the air flow connected to the first air pipe 5 increases, the piston 32 slides relative to the pressure stabilizing tank 31 to make the first spring 33 compressed, and the working space increases to reduce the air pressure; when the air pressure generated by the air flow connected to the first air pipe 5 decreases, the piston 32 slides relative to the pressure stabilizing tank 31 under the pushing action of the first spring 33, and the working space decreases to increase the air pressure.

[0035] On the other hand, the pull wires 41 connected to all the pistons 32 comprehensively act on the sliding piece 42 to make the sliding piece 42 generate a comprehensive displacement, the comprehensive displacement can reflect the average value of the air pressure of the air flow delivered to each pneumatic seeder 1, and the controller can adjust the operation of the air flow generator 2 according to the average value to timely adjust the air pressure to meet the operation requirements.

[0036] In the application, the sensor device 4 is provided with a mechanical structure and a displacement sensor 43, so that the displacement value generated by the displacement sensor 43 can fully reflect the comprehensive air pressure value of all the pressure stabilizing mechanisms 3, and the controller can effectively adjust the air pressure of all the pneumatic seeders 1 according to the air flow generator 2. Compared with the prior art, the use of sensors and electrically controlled pressure regulating devices can be significantly reduced, the cost can be reduced, the complex wiring can be avoided, and the failure rate can be reduced.

[0037] Preferably, the outer side of each of the pull wires 41 is sleeved with a flexible sleeve 45, and the two ends of the flexible sleeve 45 are fixed relative to the pressure stabilizing tank body 31 and the sliding piece 42, respectively.

[0038] Preferably, the sensor device 4 further comprises a device seat body 47, the device seat body 47 is provided with a sliding rail 48, the sliding piece 42 is provided with a sliding block 49 matched with the sliding rail 48, and the movable unit of the displacement sensor 43 is connected with the sliding piece 42.

[0039] The relative sliding direction of the device seat body 47 and the sliding piece 42 is a horizontal direction, and both of them have a vertically arranged first plate part and a second plate part, and the second spring 44 is arranged between the first plate part and the second plate part.

[0040] Preferably, the device seat body 47 is provided with a plurality of notches 47a corresponding to the flexible sleeves 45, all the notches 47a are arranged in a straight line, and the notches 47a are arranged on the first plate part; the two ends of the flexible sleeve 45 are provided with a fixing piece 46, the fixing piece 46 has a thin threaded section and a thick blocking part, the threaded section of the fixing piece 46 at one end is embedded in the notch 47a, and a fixing nut is screwed on the threaded section.

[0041] Preferably, the end of the pressure stabilizing tank body 31 is provided with a clamping groove 31a and a circular hole 31b communicated with the clamping groove 31a, the diameter of the circular hole 31b is greater than the width of the clamping groove 31a; the threaded section of the fixing piece 46 at the other end of the flexible sleeve 45 is embedded in the clamping groove 31a, and a fixing nut for fixing the fixing piece 46 is also screwed on the threaded section.

[0042] With the above structure, the wiring difficulty of the pull wire 41 can be reduced, the pull wire 41 can be freely bent, the displacement amount can be accurately transmitted, and the combined force of the plurality of pull wires 41 can be effectively converted into the displacement of the sliding piece 42. When the fixing piece 46 connected with the pressure stabilizing tank body 31 is disassembled and connected, the blocking part of the fixing piece 46 can be in and out of the circular hole 31b.

[0043] Preferably, the piston 32 has a tapered hole 32a, and a stopper 34 is mounted on the piston 32 and cooperates with the tapered hole 32a, the stopper 34 has a guide shaft 35 fixed thereon, an end of the guide shaft 35 has a baffle 36 fixed thereon, the guide shaft 35 has a third spring 37 sleeved thereon, and two ends of the third spring 37 abut against the piston 32 and the baffle 36 respectively.

[0044] With the above structure, in the normal state, when the air pressure in the pressure stabilizing mechanism 3 approaches the target air pressure, the end of the baffle 36 has a gap with the inner wall of the pressure stabilizing tank 31. When the air pressure in the pressure stabilizing tank 31 increases, the air pressure first drives the piston 32 to move for buffering, when the air pressure is too large, the piston 32 is driven to a specific position so that the baffle 36 contacts the inner wall of the pressure stabilizing tank 31, then the air pressure continues to drive the piston 32 to compress the first spring 33 to move, so that the tapered hole 32a is opened for pressure relief, ensuring that the air pressure does not exceed a specific value, preventing the air pressure from being too large to affect the operation of the air-type seed meter 1. On the other hand, the controller adjusts the operation of the airflow generator 2 to reduce the air pressure so that the pressure stabilizing mechanism 3 returns to the normal state.

[0045] In the above structure, by providing the tapered hole 32a and the elastic stopper structure on the piston 32, automatic adjustment and protection of the air pressure in the pressure stabilizing mechanism can be realized, when the air pressure is too large, the piston moves to a specific position, then the tapered hole is opened for automatic pressure relief, preventing the air pressure from exceeding the limited value, protecting the normal operation of the air-type seed meter. At the same time, the controller adjusts the airflow generator according to the air pressure change to make the pressure stabilizing mechanism return to the normal state. This design enhances the stability and reliability of the system, effectively reducing the influence of air pressure fluctuation on the operation of the seeding machine.

[0046] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A multi-row seeder with a pressure stabilizing mechanism, comprising an airflow supply system and multiple seeding units, each seeding unit including a pneumatic seed metering device; the airflow supply system including an airflow generator, a pressure stabilizing mechanism, and a controller; the number of pressure stabilizing mechanisms and pneumatic seed metering devices are equal and connected in a one-to-one correspondence; the airflow generator is connected to each of the pressure stabilizing mechanisms respectively; The pressure stabilizing mechanism includes a pressure stabilizing tank and a piston slidably mounted inside the pressure stabilizing tank, and also includes a first spring acting on the piston; Its features are: The airflow supply system also includes a sensing device, which includes a pull wire connecting each of the pistons, all of which are connected to a slider, a second spring acting on the slider, and a displacement sensor for detecting the displacement of the slider, the displacement sensor being connected to a controller. Each of the pull wires is fitted with a flexible sleeve on its outer side, and the two ends of the flexible sleeve are fixed relative to the pressure stabilizing tank and the sliding component, respectively. The sensing device also includes a device base, on which a slide rail is mounted, and on which a slider that cooperates with the slide rail is mounted. The device base has a number of slots that correspond one-to-one with the flexible sleeve, and all the slots are arranged in a linear array; both ends of the flexible sleeve have fixing members, and the fixing members have a fine threaded section and a coarse blocking part; the threaded section of the fixing member at one end is embedded in the slot, and a fixing nut is screwed onto the threaded section. The end of the pressure stabilizing tank has a slot and a circular hole communicating with the slot, the diameter of the circular hole being larger than the width of the slot; the threaded section of the fixing member at the other end of the flexible sleeve is embedded in the slot, and a fixing nut for fixing the fixing member is also screwed onto the threaded section.

2. The multi-row seeder with a pressure stabilizing mechanism according to claim 1, characterized in that, The piston has a tapered hole, and a stopper that mates with the tapered hole is installed on the piston. A guide shaft is fixed on the stopper, and a baffle is fixed at the end of the guide shaft. A third spring is sleeved on the guide shaft, and the two ends of the third spring abut against the piston and the baffle, respectively.

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