Load holding valve structure and agricultural machine

Abstract

The utility model discloses a load holding valve structure and an agricultural machine. Belongs to the technical field of hydraulic control. The load holding valve structure comprises a one-way valve, a first oil port, a second oil port, a first valve element and a second valve element, one end of the pilot oil duct is communicated with the valve tail section of the one-way valve; the main valve comprises a second valve element, the second valve element moves in the axial direction of a valve channel of the main valve, the other end of the pilot oil channel communicates with the main valve, and the second valve element is moved to have the two states of blocking the pilot oil channel and opening the pilot oil channel; and the main oil duct is communicated with the main valve and the valve head section of the one-way valve. Provided is a load holding valve having a simpler structure.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic control, in particular to a load holding valve structure and agricultural machinery. Background Art

[0002] With the rapid development of construction machinery, the stability of the hydraulic system under load is becoming more and more important to the safety and working performance of the main machine. To solve the leakage problem, the method in the prior art is to reduce the matching clearance between the valve stem and the valve hole. This requires particularly high machining accuracy of the valve hole and the valve stem, and too small a clearance can easily cause the valve stem to get stuck. There is also a load holding valve structure between the load and the main valve core, but the traditional load holding valve structure has many parts, a complex structure, and a high cost. Utility Model Content

[0003] The main purpose of the utility model is to provide a load holding valve structure with a simpler structure.

[0004] To achieve the above-mentioned purpose, the load holding valve structure proposed in the utility model includes:

[0005] a one-way valve, the one-way valve being connected to a first oil port, the first oil port being connected to a hydraulic load;

[0006] A pilot oil passage, one end of which is connected to a valve tail section of the one-way valve;

[0007] A main valve, the main valve comprising a second valve core, the second valve core moves axially along the valve path of the main valve, the other end of the pilot oil path is connected to the main valve, and the second valve core moves to have two states of blocking the pilot oil path and opening the pilot oil path;

[0008] A main oil passage is connected to the main valve and the valve head section of the one-way valve.

[0009] Optionally, in an embodiment of the present utility model, the main valve is connected to the oil tank.

[0010] Optionally, in an embodiment of the present utility model, the main valve is connected to the oil tank through two oil ports, namely the second oil port and the third oil port.

[0011] Optionally, in an embodiment of the present utility model, the one-way valve includes a first valve body and a first valve core, and a conical surface seal is formed between the first valve body and the first valve core.

[0012] Optionally, in an embodiment of the present utility model, the one-way valve further includes a first spring, one end of the first spring abuts against the first valve body, and the other end of the first spring abuts against the first valve core.

[0013] Optionally, in an embodiment of the present utility model, the second valve core includes a blocking section and an opening section, the blocking section fills the valve channel, a gap is provided between the opening section and the valve channel, and the blocking section is connected to the opening section.

[0014] Optionally, in an embodiment of the present utility model, the main valve further includes a second spring and a second valve body, and the second valve core is connected to the second valve body via the second spring.

[0015] Optionally, in an embodiment of the present invention, the second valve core is integrally formed.

[0016] Optionally, in an embodiment of the present utility model, the valve channel includes an open section, a gap exists between the open section and the second valve core, and the open section is directly connected to the main oil channel.

[0017] To achieve the above object, the utility model also provides an agricultural machine, comprising the load holding valve structure described above.

[0018] Compared with the prior art, the utility model can at least achieve the following beneficial effects. By adding a pilot oil channel between the one-way valve and the main valve, the one-way valve, the main valve and the pilot oil channel can achieve different flow modes of hydraulic oil through synergy, so that the hydraulic load can meet the four working conditions of lifting, holding, lowering and floating. The load holding valve structure proposed in this solution is simpler than the traditional load holding valve structure, reduces its failure rate, prolongs its service life and enables it to be applied in different working environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the load holding valve structure of the utility model in a lifting condition;

[0021] Figure 2 It is a schematic diagram of the load holding valve structure of the utility model in the holding working condition;

[0022] Figure 3 It is a schematic diagram of the load holding valve structure of the utility model in a descending condition;

[0023] Figure 4 It is a schematic diagram of the load holding valve structure of the utility model in a floating condition.

[0024] Description of Figure Numbers:

[0025] 100, one-way valve; 110, valve head section; 120, valve tail section; 210, first oil port; 220, second oil port; 230, third oil port; 300, pilot oil channel; 400, main valve; 410, second valve core; 411, blocking section; 412, opening section; 420, valve channel; 421, opening section; 500, main oil channel;

[0026] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0031] Reference Figure 1~Figure 4 The utility model provides a load holding valve structure, comprising:

[0032] The one-way valve 100 is connected to the first oil port 210, and the first oil port 210 is connected to the hydraulic load;

[0033] A pilot oil passage 300 , one end of which is connected to the valve tail section 120 of the one-way valve 100 ;

[0034] The main valve 400 includes a second valve core 410, which moves axially along a valve passage 420 of the main valve 400. The other end of the pilot oil passage 300 is connected to the main valve 400. The second valve core 410 moves in two states: blocking the pilot oil passage 300 and opening the pilot oil passage 300.

[0035] The main oil passage 500 is connected to the main valve 400 and the valve head section 110 of the one-way valve 100 .

[0036] The load holding valve structure proposed in this solution controls the flow of hydraulic oil through the axial movement of the second valve core 410, so that the hydraulic load can achieve four working conditions: lifting, holding, lowering and floating, which are now explained one by one.

[0037] Working condition 1: Lifting working condition

[0038] Reference Figure 1, under lifting conditions, a large amount of hydraulic oil is required at the hydraulic load to achieve lifting. At this time, the second valve core 410 blocks the pilot oil passage 300, the pilot oil in the pilot oil passage 300 cannot flow out, and the main valve 400 core and the check valve 100 cannot be connected through the pilot oil passage 300. The oil enters the main valve 400 core through the third oil port 230, flows from the main valve 400 core through the pilot oil passage 300 and reaches the check valve 100, the oil squeezes the first valve core, the first spring is compressed, the check valve 100 opens (this is the positive opening of the check valve 100), the oil passes through the check valve 100 through the first oil port 210 to the hydraulic load, and the hydraulic oil is pressurized by the booster pump to achieve the lifting action of the hydraulic load.

[0039] Working condition 2: Maintain working condition

[0040] Reference Figure 2 , under the holding condition, the hydraulic load needs the hydraulic oil to be kept at a certain volume and pressure. At this time, the second valve core 410 blocks the pilot oil passage 300, the pilot oil in the pilot oil passage 300 cannot flow out, and the main valve 400 core and the check valve 100 cannot be connected through the pilot oil passage 300. At the same time, after the hydraulic oil at the hydraulic load enters the first oil port 210, the check valve 100 is opened in the reverse direction, and the hydraulic oil cannot enter the main valve 400, and it is blocked between the check valve 100 and the hydraulic load, so that the hydraulic load can stably maintain a certain state.

[0041] Working condition 3: descending condition

[0042] Reference Figure 3 , under the descending condition, the hydraulic oil at the hydraulic load needs to flow out. At this time, the second valve core 410 moves to another position, so that the pilot oil passage 300 is connected with the pilot oil passage 300 between the main valve 400 cores, and the hydraulic oil at the hydraulic load flows to the check valve 100 through the first oil port 210, squeezing the valve core of the check valve 100. Since the hydraulic oil in the pilot oil passage 300 can enter the main valve 400 core to flow out of the pilot oil passage 300, the hydraulic oil at the first oil port 210 can reversely open the check valve 100, enter the main oil passage 500, and flow back to the oil tank through the second oil port 220 and the third oil port 230. The two oil ports make the pressure at the hydraulic load more quickly released, and the descending action of the hydraulic load is realized.

[0043] Working condition 4: Floating working condition

[0044] Reference Figure 4In the floating condition, the hydraulic oil at the hydraulic load needs to realize bidirectional flow. At this time, the second valve core 410 does not block the pilot oil passage 300, and the hydraulic oil can realize the flow direction of the first oil port 210-check valve 100-main valve 400-second oil port 220 (third oil port 230)-oil tank, or the flow direction of the oil tank-second oil port 220 (third oil port 230)-main valve 400-check valve 100-first oil port 210, which is mainly determined by the pressure at the first oil port 210 and the oil tank, realizing the floating function of the hydraulic load.

[0045] To make it easier to understand, the floating function is designed to meet the work of machinery such as harrows. Since the land is uneven, the harrow needs to rise and fall with the ups and downs of the land to prevent damage.

[0046] Specifically, the main valve 400 is connected to the oil tank. When the hydraulic oil flows from the main valve 400 to the first oil port 210, the oil tank supplies oil to the hydraulic load. When the hydraulic oil flows from the first oil port 210 to the main valve 400, the oil tank stores oil.

[0047] The spring is used to realize the opening and closing of the one-way valve 100 and the adjustment of the main valve 400. Its elastic deformation characteristics enable the valve to maintain a stable closed or open state without continuous external force. In addition, the spring can ensure the precise adjustment of the valve during the opening and closing process, so that the opening pressure of the valve and the stroke of the valve core are maintained within the preset range, ensuring the sealing stability of the valve in the closed state.

[0048] The second valve core 410 is provided with a blocking section 411 and an opening section 412, which respectively realize different coordination modes with the valve channel 420. By setting the blocking section 411 and the opening section 412, the main valve 400 can realize the control of the pilot oil channel 300 only by moving the position of the second valve core 410, and finally realize different working modes for the hydraulic load. This control method is relatively simple.

[0049] The second valve core 410 is integrally formed. Since the second valve core 410 needs to frequently perform axial movement during operation and the widths of various sections in the axial direction are not the same, the integral forming can ensure that the various parts of the second valve core 410 are closely connected and have high structural strength, and can also reduce assembly problems, reduce the generation of excess materials and waste, and reduce costs.

[0050] The axial width of the valve channel 420 of the main valve 400 core is not fixed. Since the oil tank must always be connected to the main oil channel 500 no matter how the main valve 400 core moves, an open section 421 is provided on the valve channel 420. The axial width of the open section 421 is greater than any part of the second valve core 410, thereby enabling the oil tank to be connected to the main oil channel 500.

[0051] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A load holding valve structure, characterized in that: include: A one-way valve (100), the one-way valve (100) being connected to a first oil port (210), the first oil port (210) being connected to a hydraulic load; A pilot oil passage (300), one end of the pilot oil passage (300) being connected to a valve tail section (120) of the one-way valve (100); A main valve (400), the main valve (400) comprising a second valve core (410), the second valve core (410) moving axially along a valve passage (420) of the main valve (400), the other end of the pilot oil passage (300) being connected to the main valve (400), and the second valve core (410) moving has two states of blocking the pilot oil passage (300) and opening the pilot oil passage (300); A main oil passage (500), wherein the main oil passage (500) is connected to the main valve (400) and the valve head section (110) of the one-way valve (100).

2. The load holding valve structure according to claim 1, characterized in that: The main valve (400) is in communication with the oil tank.

3. The load holding valve structure according to claim 2, characterized in that: The main valve (400) is connected to the oil tank via two oil ports, namely the second oil port (220) and the third oil port (230).

4. The load holding valve structure according to claim 1, characterized in that: The one-way valve (100) comprises a first valve body and a first valve core, and a conical surface seal is formed between the first valve body and the first valve core.

5. The load holding valve structure according to claim 4, characterized in that: The one-way valve (100) further comprises a first spring, one end of which abuts against the first valve body, and the other end of which abuts against the first valve core.

6. The load holding valve structure according to claim 1, characterized in that: The second valve core (410) comprises a blocking section (411) and an opening section (412), the blocking section (411) fills the valve channel (420), there is a gap between the opening section (412) and the valve channel (420), and the blocking section (411) is connected to the opening section (412).

7. The load holding valve structure according to claim 6, characterized in that: The main valve (400) further comprises a second spring and a second valve body, and the second valve core (410) is connected to the second valve body via the second spring.

8. The load holding valve structure according to claim 6, characterized in that: The second valve core (410) is integrally formed.

9. The load holding valve structure according to claim 1, characterized in that: The valve passage (420) comprises an open section (421), a gap exists between the open section (421) and the second valve core (410), and the open section (421) is directly connected to the main oil passage (500).

10. An agricultural machine, characterized in that: The machine comprises a load holding valve arrangement according to any one of claims 1-9.

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