A valve group for automatic flow stabilization system

Abstract

The present invention discloses a valve group of an automatic flow stabilizing system, comprising a safety valve, a diverter flow stabilizing valve, a reversing valve, a merging bridge valve, an electrically controlled reversing valve and a plurality of lockable reversing valves; the diverter flow stabilizing valve has three oil circuits, and the diverter flow stabilizing valve is directly connected to the main control oil ports of the reversing valve, the merging bridge valve, the electrically controlled reversing valve and the lockable reversing valve through the main control oil circuit; the diverter flow stabilizing valve bypasses the reversing valve and is connected in parallel to the main control oil circuit of the merging bridge valve through oil circuit 2 and an external oil pipe to form a confluence; the main control oil circuit is then connected to the auxiliary control oil ports of the electrically controlled reversing valve and the plurality of lockable reversing valves through the auxiliary control oil port on the merging bridge valve; and the diverter flow stabilizing valve is connected to the auxiliary control oil port of the reversing valve after throttling through oil circuit 1. The valve group controls the synchronous operation of the lifting mechanism and the motor by setting a diverter and flow stabilizing valve with diverter and flow stabilizing functions and a converging bridge valve with a converging oil path, so as to ensure that the air compressor can work without interference under any working conditions and avoid missed sowing.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic valve groups, and in particular to a valve group of an automatic flow stabilization system. Background Art

[0002] There are many types of seed drills, primarily categorized by the type of seeding mechanism. Commonly used are mechanical types, such as external groove wheel, eyelet, finger clamp, and door-type seed drills. In recent years, pneumatic precision seed drills have gained popularity and are currently the most widely used seed drill.

[0003] The pneumatic precision seeder can simultaneously perform furrowing, side fertilization, stubble breaking, sowing, covering, and compacting operations. It is widely used in hole-seeding crops of large and medium-sized grains, such as corn, soybeans, sorghum, and sugar beets, and features strong versatility, excellent sowing results, and a high emergence rate.

[0004] When the air-suction seed meter operates, a high-speed fan generates negative pressure, which is transmitted to the vacuum chamber of the seed metering unit. As the seed disc rotates, the negative pressure in the vacuum chamber attracts the seeds, causing them to rotate with the disc. Once the seeds exit the vacuum chamber, they are no longer subject to negative pressure and fall into the seed furrow under their own weight or with the help of a seed scraper.

[0005] The air-suction precision seeding system achieves a high per-plant rate, eliminating the need for thinning and preventing multiple seedlings from competing for fertilizer and light in the same hole. The seeder unit utilizes a four-link contouring structure to ensure consistent seeding depth across rows. Individual rows can be individually shut off for convenient field operations. Each blower has been professionally tested. A fertilizer blower vent is included, allowing for optional fertilizer blowing depending on the application. A central air chamber mitigates losses caused by fluctuating wind pressure at the field's edge.

[0006] Due to the above characteristics, pneumatic precision seeders are the first choice for seeders. However, the hydraulic systems of domestic tractors currently do not support the rotation of the sowing motor while lifting the seeder, resulting in missed sowing in some extreme working conditions. Summary of the Invention

[0007] In order to overcome the defects of the prior art, the purpose of the present invention is to provide a valve group of an automatic flow stabilization system, which controls the constant speed operation of the motor through the diversion flow stabilization valve plate, and controls the synchronous operation of the lifting mechanism and the motor through the converging bridge valve plate, so as to ensure that the air compressor can work without interference under any working conditions and avoid the occurrence of missed sowing.

[0008] To this end, the present invention proposes a valve group for an automatic flow stabilization system, including a safety valve, a diverter stabilizing valve, a reversing valve, a merging bridge valve, an electrically controlled reversing valve and several lockable reversing valves; the safety valve and the diverter stabilizing valve are respectively connected to the main oil inlet P, the reversing valve is connected to the hydraulic motor, and the electrically controlled reversing valve and several lockable reversing valves are respectively connected to the oil cylinder of the seeder lifting mechanism.

[0009] Among them, the diverter and flow stabilizing valve has three oil circuits, and the diverter and flow stabilizing valve is directly connected to the main control oil port of the reversing valve, the merging bridge valve, the electrically controlled reversing valve and several of the lockable reversing valves through the main control oil circuit; the diverter and flow stabilizing valve bypasses the reversing valve and is connected in parallel to the main control oil circuit of the merging bridge valve through oil circuit 2 and the external oil pipe to form a confluence; the main control oil circuit is then connected to the auxiliary control oil port of the electrically controlled reversing valve and several of the lockable reversing valves through the auxiliary control oil port on the merging bridge valve; and the diverter and flow stabilizing valve is connected to the auxiliary control oil port of the reversing valve after throttling through oil circuit 1.

[0010] Furthermore, the diversion and flow stabilizing valve includes a valve body, a compensation valve core, a spring and a plug screw. The valve body has a valve cavity. The compensation valve core and the left side of the valve cavity form a left oil channel, and the compensation valve core and the right side of the valve cavity form a right oil channel. The valve body is provided with an oil inlet and an auxiliary control oil outlet connected to the valve cavity, and the oil inlet is connected to the total oil inlet P; the converging bridge valve has an oil channel 1, an oil channel 2 and a main control oil port that are connected to each other, and also has an auxiliary control oil port; the oil channel 1 is connected to the right oil channel through an external oil pipe.

[0011] In which, the oil inlet is connected with the main control oil port through the main control oil port of the reversing valve, and the oil inlet is also connected with the main control oil port through the right oil channel, the external oil pipe, the oil channel one, and the oil channel two; the oil inlet is also connected with the auxiliary control oil port of the reversing valve through the compensation valve core, the left oil channel, and the auxiliary control oil outlet; in addition, the auxiliary control oil port is connected with the main control oil port, and the auxiliary control oil port supplies oil to the auxiliary control oil ports of the electrically controlled reversing valve and the lockable reversing valve.

[0012] Furthermore, an outer end of the oil channel has an interface CI, and the diverter and flow stabilizing valve is provided with an interface CO communicating with the right oil channel; the interface CI and the interface CO are connected through the external oil pipe.

[0013] Furthermore, the auxiliary control oil outlet is communicated with the left oil passage, and a speed regulating port is provided between the auxiliary control oil outlet and the left oil passage.

[0014] Furthermore, a speed regulating and throttling mechanism is provided between the auxiliary control oil port and the main control oil port.

[0015] Furthermore, the screw plug is arranged at the left end of the compensation valve core and is used to limit the channel.

[0016] Furthermore, the spring is arranged at the right end of the compensation valve core to provide a preset pressure value.

[0017] Furthermore, the valve body is provided with a feedback port, which is communicated with the auxiliary control oil outlet.

[0018] Furthermore, the diversion flow stabilizing valve is provided with an oil return port 1, and the merging bridge valve is provided with an oil return port 2. Similarly, the reversing valve, the electrically controlled reversing valve and several of the lockable reversing valves are all provided with oil return ports, and multiple oil return ports are connected in parallel with the oil return port 1 and the oil return port 2.

[0019] Furthermore, the lockable reversing valve is a four-position six-way reversing valve; the electrically controlled reversing valve is a three-position four-way reversing valve, and two working oil circuits of the electrically controlled reversing valve are further provided with a two-position two-way electromagnetic reversing valve.

[0020] The valve group of the automatic flow stabilization system provided by the present invention is provided with a diverter and stabilizing valve with diverting and stabilizing functions and a converging bridge valve with a converging oil path. The diverter and stabilizing valve is provided with a compensating valve core and a spring to control the flow of the reversing valve connected to the hydraulic motor and control the constant speed operation of the motor; ensure the flow of several locked reversing valves and electronically controlled reversing valves connected to the seed drill, control the synchronous operation of the lifting mechanism and the motor, and ensure that the air compressor can work without interference under any working conditions, thus avoiding the occurrence of missed sowing. In addition, the valve group has its own diverter and converging technology, low-energy unloading at the middle position, and can also achieve stepless speed regulation of the seed drill motor from zero to maximum. At the same time, it can promote the compound action without interference with the accessories to prevent the phenomenon of missed sowing grains.

[0021] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 This is a schematic structural diagram of the valve group of the automatic flow stabilization system of the present invention;

[0024] Figure 2 This is a schematic diagram of the valve group of the automatic flow stabilization system of the present invention;

[0025] Figure 3 A front view of a diverter bridge valve of a valve group of an automatic flow stabilization system of the present invention;

[0026] Figure 4 A cross-sectional view of a flow diversion bridge valve of a valve group of an automatic flow stabilization system of the present invention;

[0027] Figure 5 A cross-sectional view of a combined flow bridge valve of a valve group of an automatic flow stabilization system of the present invention;

[0028] Description of Reference Numerals

[0029] 1. Safety valve; 2. Diverter and steady-flow valve; 3. Reversing valve; 4. Combining bridge valve; 5. Lockable reversing valve; 6. Electric-controlled reversing valve; 11. Oil circuit one; 12. Oil circuit two; 13. Main control oil circuit; 21. Speed ​​regulating port; 22. Feedback port; 23. Auxiliary control oil outlet; 24. Oil return port one; 25. Screw plug; 26. Left oil channel; 27. Compensating valve core; 28. Oil inlet; 29. ​​Spring; 210. Right oil channel; 41. Oil channel one; 42. Oil channel two; 43. Main control oil port; 44. Oil return port two; 45. Auxiliary control oil port. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] like Figures 1 to 5 As shown, the valve group of the automatic flow stabilizing system of the present invention includes: a safety valve 1, a diverter and stabilizing valve 2, a reversing valve 3, a converging bridge valve 4, an electrically controlled reversing valve 6 and a plurality of lockable reversing valves 5; the safety valve 1 and the diverter and stabilizing valve 2 are respectively connected to the main oil inlet P.

[0032] The diverter and stabilizing valve 2 has three oil circuits. The diverter and stabilizing valve 2 is directly connected to the main control oil ports of the reversing valve 3, the merging bridge valve 4, the electronically controlled reversing valve 6 and several lockable reversing valves 5 through the main control oil circuit 13; the diverter and stabilizing valve 2 bypasses the reversing valve 3 and is connected in parallel to the main control oil circuit 13 of the merging bridge valve 4 through the oil circuit 2 12 and the external oil pipe to form a confluence; the main control oil circuit 13 is then connected to the auxiliary control oil ports of the electronically controlled reversing valve 6 and several lockable reversing valves 5 through the auxiliary control oil port 45 of the merging bridge valve 4; and the diverter and stabilizing valve 2 is connected to the auxiliary control oil port of the reversing valve 3 after throttling through the oil circuit 1 11.

[0033] Among them, the auxiliary control oil port and main control oil port of the electric-controlled reversing valve 6 and the lockable reversing valve 5 are respectively connected to the oil cylinder in the lifting mechanism connected to the electric-controlled reversing valve 6 and the lockable reversing valve 5 to achieve precise control of the seeder, and the reversing valve 3 is connected to the hydraulic motor.

[0034] Specifically, if Figure 3 、 Figure 4 As shown, the diverter and steady flow valve 2 includes a valve body, a compensation valve core 27, a spring 29, a speed regulating port 21 and a plug screw 25; the valve body has a valve cavity, the compensation valve core 27 and the left side of the valve cavity form a left oil channel 26, the compensation valve core 27 and the right side of the valve cavity form a right oil channel 210, the spring 29 is arranged at the right end of the compensation valve core 27, and is responsible for providing a preset pressure value; the plug screw 25 is arranged at the left end of the compensation valve core 27, and is responsible for limiting the channel.

[0035] The valve body is equipped with an oil inlet 28 and an auxiliary control oil outlet 23, both communicating with the valve cavity. The oil inlet 28 is connected to the main oil inlet P. The auxiliary control oil outlet 23 is connected to the left oil passage 26, with the speed control port 21 located between them. The valve body also has a feedback port 22, which communicates with the auxiliary control oil outlet 23 and provides load feedback to both sides of the spool valve. This allows the oil output of the auxiliary control oil outlet 23 to be adjusted by changing the size of the speed control port 21.

[0036] like Figure 5 As shown, the merging bridge valve 4 has an oil channel 1 41, an oil channel 2 42, a main control oil port 43, and an auxiliary control oil port 45, which are interconnected. The main control oil port 43 is connected to the oil channel 1 41 through the oil channel 2 42, and the interface CI at the outer end of the oil channel 1 41 is connected to the interface CO on the diversion and stabilizing valve 2 through an oil pipe. At the same time, the interface CO is connected to the right oil channel 210.

[0037] When the hydraulic oil enters from the oil inlet 28, a part of it directly passes through the main control oil port of the reversing valve 3 and enters the main control oil port 43 of the merging bridge valve 4, forming the main control oil circuit 13; a part of the oil passes through the compensation valve core 27 and the left oil channel 26 into the speed regulating port 21, is adjusted to the preset flow rate, and then enters the auxiliary control oil port of the reversing valve 3 through the auxiliary control oil outlet 23 to participate in the operation of the motor.

[0038] The remaining flow in the valve chamber of the diverter and stabilizer valve 2 enters the right oil channel 210, which is then connected to the merging bridge valve 4 via an external oil pipe. This allows the oil in the upper oil channel 12 of the diverter and stabilizer valve 2 to be collected at the main control oil port of the merging bridge valve 4, merged with the main control oil channel 13, and then connected to the main control oil ports of the electronically controlled reversing valve 6 and the several lockable reversing valves 5 through the main control oil port 43. In addition, the auxiliary control oil port 45 is connected to the main control oil port 43, and a speed regulating and throttling mechanism is installed between the two. The outer end of the auxiliary control oil port 45 is connected to the auxiliary control oil ports of the electronically controlled reversing valve 6 and the several lockable reversing valves 5.

[0039] Among them, the auxiliary control oil port and the main control oil port of the electric control reversing valve 6 and the lockable reversing valve 5 are respectively connected to the oil cylinder in the lifting mechanism connected to the electric control reversing valve 6 and the lockable reversing valve 5, so as to realize precise control of the seeder.

[0040] like Figure 3 、 Figure 5 As shown, the diverter stabilizing flow valve 2 is provided with an oil return port 1 24, and the merging bridge valve 4 is provided with an oil return port 2 44. Similarly, the reversing valve 3, the electronically controlled reversing valve 6 and the plurality of lockable reversing valves 5 are all provided with oil return ports. The multiple oil return ports are connected in parallel with the oil return port 1 24 and the oil return port 2 44, and finally connected to the oil return oil circuit, thereby realizing oil return of the multiple reversing valves.

[0041] In addition, the locking reversing valve 5 is a four-position, six-way reversing valve. Ports A and B on the locking reversing valve 5 are connected to the oil cylinder of the lifting mechanism, respectively, to achieve lifting, lowering, and floating neutral locking. The handle automatically resets after the lifting position is reached. The electrically controlled reversing valve 6 is a three-position, four-way reversing valve. The two working oil circuits of the electrically controlled reversing valve 6 are also equipped with two-position, two-way solenoid reversing valves to achieve electrically controlled lifting, lowering, and floating neutral locking.

[0042] like Figure 1 As shown, the oil inlet of the safety valve 1 is connected to the main oil inlet P, and the oil discharge port of the safety valve 1 is connected to the T port. The safety valve 1 mainly limits the maximum safety pressure.

[0043] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A valve group for an automatic flow stabilization system, characterized in that: The invention comprises a safety valve (1), a diverter and steady flow valve (2), a reversing valve (3), a combined bridge valve (4), an electrically controlled reversing valve (6) and a plurality of lockable reversing valves (5); the safety valve (1) and the diverter and steady flow valve (2) are respectively connected to a main oil inlet P, the reversing valve (3) is connected to a hydraulic motor, the electrically controlled reversing valve (6) and the plurality of lockable reversing valves (5) are respectively connected to an oil cylinder of a sowing machine lifting mechanism; and the lockable reversing valve (5) is a four-position six-way reversing valve; The diverter and stabilizer valve (2) has three oil circuits. The diverter and stabilizer valve (2) is directly connected to the main control oil ports of the reversing valve (3), the merging bridge valve (4), the electric control reversing valve (6) and the plurality of lockable reversing valves (5) through the main control oil circuit (13); the diverter and stabilizer valve (2) bypasses the reversing valve (3) and is connected in parallel to the main control oil circuit (13) of the merging bridge valve (4) through the oil circuit 2 (12) and the external oil pipe to form a merging flow; the main control oil circuit (13) is then connected to the auxiliary control oil ports of the electric control reversing valve (6) and the plurality of lockable reversing valves (5) through the auxiliary control oil port (45) on the merging bridge valve (4); and the diverter and stabilizer valve (2) is connected to the auxiliary control oil port of the reversing valve (3) after throttling through the oil circuit 1 (11); The diversion and steady flow valve (2) comprises a valve body, a compensation valve core (27), a spring (29) and a screw plug (25); a valve cavity is provided in the valve body; the compensation valve core (27) and the left side of the valve cavity form a left oil passage (26); the compensation valve core (27) and the right side of the valve cavity form a right oil passage (210); an oil inlet (28) and an auxiliary control oil outlet (23) communicating with the valve cavity are provided on the valve body; the oil inlet (28) is communicated with the main oil inlet P; The merging bridge valve (4) has an oil passage 1 (41), an oil passage 2 (42) and a main control oil port (43) that are interconnected, and also has an auxiliary control oil port (45); the oil passage 1 (41) is connected to the right oil passage (210) through an external oil pipe; The oil inlet (28) is connected to the main control oil port (43) through the main control oil port of the reversing valve (3), and the oil inlet (28) is also connected to the main control oil port (43) through the right oil channel (210), the external oil pipe, the oil channel 1 (41), and the oil channel 2 (42); the oil inlet (28) is also connected to the auxiliary control oil port of the reversing valve (3) through the compensation valve core (27), the left oil channel (26), and the auxiliary control oil outlet (23); in addition, the auxiliary control oil port (45) is connected to the main control oil port (43), and the auxiliary control oil port (45) supplies oil to the auxiliary control oil ports of the electric control reversing valve (6) and the lockable reversing valve (5).

2. The valve group of the automatic flow stabilization system according to claim 1, characterized in that: The outer end of the oil channel 1 (41) is provided with an interface CI, and the diversion and flow stabilizing valve (2) is provided with an interface CO communicating with the right oil channel (210); the interface CI and the interface CO are connected via the external oil pipe.

3. The valve group of the automatic flow stabilization system according to claim 1, characterized in that: The auxiliary control oil outlet (23) is in communication with the left oil passage (26), and a speed regulating port (21) is provided between the auxiliary control oil outlet (23) and the left oil passage (26).

4. The valve group of the automatic flow stabilization system according to claim 1, characterized in that: A speed regulating and throttling mechanism is provided between the auxiliary control oil passage port (45) and the main control oil passage port (43).

5. The valve group of the automatic flow stabilization system according to claim 1, characterized in that: The screw plug (25) is arranged at the left end of the compensation valve core (27) and is used for limiting the channel.

6. The valve group of the automatic flow stabilization system according to claim 1, characterized in that: The spring (29) is arranged at the right end of the compensation valve core (27) and is used to provide a preset pressure value.

7. The valve group of the automatic flow stabilization system according to claim 1, characterized in that: The valve body also has a feedback port (22), and the feedback port (22) is communicated with the auxiliary control oil outlet (23).

8. The valve group of the automatic flow stabilization system according to claim 1, characterized in that: The diversion and stabilizing flow valve (2) is provided with an oil return port 1 (24), and the converging bridge valve (4) is provided with an oil return port 2 (44). Similarly, the reversing valve (3), the electrically controlled reversing valve (6) and the plurality of lockable reversing valves (5) are all provided with oil return ports, and the plurality of oil return ports are connected in parallel with the oil return port 1 (24) and the oil return port 2 (44).

9. The valve group of the automatic flow stabilization system according to claim 1, characterized in that: The electrically controlled reversing valve (6) is a three-position four-way reversing valve, and two working oil circuits of the electrically controlled reversing valve (6) are further provided with two-position two-way electromagnetic reversing valves.

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