Simple hydraulic control reversing valve and concrete pump truck pumping mechanism hydraulic system

Abstract

The utility model belongs to concrete pump truck hydraulic system technical field, specifically disclose a kind of simple type hydraulic control reversing valve and concrete pump truck pumping mechanism hydraulic system. The simple type hydraulic control reversing valve of the utility model, structure simplifies, high reliability, long service life, by optimizing valve body and valve core structure, completely cancelled the reset spring of control oil port place in traditional hydraulic control reversing valve easily damaged, fundamentally eliminates the failure mode of spring failure. The left and right movement of valve core is purely driven by the pressure difference of hydraulic control oil port X and Y, and precise positioning and retention are realized by the sliding of left piston and right piston in left and right push chamber. This design fundamentally eliminates the problems of valve core sticking or reset failure caused by spring fatigue, fracture or plastic deformation, greatly improves the working reliability of reversing valve itself. It is applied to concrete pump truck pumping mechanism hydraulic system, to fundamentally reduce the failure rate and maintenance cost of concrete pump truck pumping mechanism hydraulic system.

Description

Technical Field

[0001] This utility model belongs to the technical field of hydraulic systems for concrete pump trucks, and relates to a simplified hydraulic control directional valve and a hydraulic system for the pumping mechanism of a concrete pump truck. Background Technology

[0002] Concrete pump trucks are key equipment used for conveying concrete in modern construction. Their core actuator—the pumping mechanism—drives the alternating reciprocating motion of a pair of main hydraulic cylinders to alternately move the concrete cylinder, and the alternating reciprocating motion of a pair of swing cylinders to move the rocker arm and distribution valve, thus achieving continuous concrete pumping. This alternating reciprocating motion process is controlled and switched by a hydraulically controlled directional valve in the hydraulic system.

[0003] Currently, the hydraulic systems used in concrete pump trucks operate with extremely high hydraulic reversing frequencies due to their inherent characteristics. As a core control component, the performance and reliability of the hydraulically controlled directional valve directly impact the stability and efficiency of the entire pumping system. However, the hydraulically controlled directional valves commonly used at present exhibit numerous problems under long-term, high-frequency reversing conditions. For example, their internal structure is typically complex, and a return spring is usually installed at the control port to ensure reliable valve core reset. Under the high-pressure impact of hydraulic oil and the alternating stress caused by frequent reversing, this return spring is prone to fatigue, breakage, or permanent deformation, leading to valve core failure and ultimately causing the entire directional valve to malfunction. This structural defect makes the hydraulically controlled directional valve a high-risk point for system failure, requiring frequent downtime for replacement. This not only increases equipment maintenance costs but also impacts construction progress due to unexpected downtime. Utility Model Content

[0004] The purpose of this invention is to propose a simplified hydraulic control directional valve and a hydraulic system for the pumping mechanism of a concrete pump truck, so as to simplify the structure of the hydraulic control directional valve, improve reliability, extend service life, and fundamentally reduce the failure rate and maintenance cost of the hydraulic system for the pumping mechanism of a concrete pump truck.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: A simplified hydraulic directional valve includes a valve body and a valve core, with a left push chamber opened on the left side inside the valve body; The valve body has chambers T1, A, P, B and T2 arranged sequentially from left to right in the middle position inside the valve body. Chambers T1 and T2 are connected by a transition oil passage. A right push chamber is opened on the right side of the valve body; The valve core cavity is opened from left to right inside the valve body. The valve core cavity is connected to the left push cavity, cavity T1, cavity A, cavity P, cavity B, cavity T2 and right push cavity from left to right. The valve body is equipped with oil port T, oil port P, oil port A, oil port B, hydraulic control oil port X, hydraulic control oil port Y and overflow oil port L; Oil port T is connected to chamber T1 or chamber T2, oil port P is connected to chamber P, oil port A is connected to chamber A, oil port B is connected to chamber B, hydraulic control oil port X is connected to the outside of the left push chamber, hydraulic control oil port Y is connected to the outside of the right push chamber, and overflow oil port L is connected to the inside of the left push chamber and the inside of the right push chamber via the overflow oil passage. The valve core is provided with a first shoulder, a first oil groove, a second shoulder, a second oil groove, a third shoulder, a third oil groove, and a fourth shoulder from left to right. A left piston is installed at the left end of the valve core, and a right piston is installed at the right end of the valve core; The valve core passes through the valve core cavity, the left piston slides into the left push cavity, and the right piston slides into the right push cavity; When the oil pressure at hydraulic control port X is greater than the oil pressure at hydraulic control port Y, the valve core moves to the right relative to the valve body, the first oil groove connects chamber T1 and chamber A, and the second oil groove connects chamber P and chamber B; When the oil pressure at hydraulic control port Y is greater than the oil pressure at hydraulic control port X, the valve core moves to the left relative to the valve body, the third oil groove connects chamber T2 and chamber B, and the second oil groove connects chamber P and chamber A.

[0006] Preferably, the valve body includes a middle valve body, a left valve body, and a right valve body, with the left valve body assembled and connected to the left side of the middle valve body and the right valve body assembled and connected to the right side of the middle valve body; Chambers T1, A, P, B and T2 are located inside the intermediate valve body, the left push chamber is at least partially located inside the left valve body and the right push chamber is at least partially located inside the right valve body.

[0007] Preferably, a sealing ring is provided between the left valve body and the left side of the middle valve body, and a sealing ring is provided between the right valve body and the right side of the middle valve body.

[0008] Preferably, the transition oil passage is located inside the intermediate valve body.

[0009] Preferably, oil ports T, P, A, and B are located on the middle valve body, hydraulic control port X is located on the left valve body, and hydraulic control port Y is located on the right valve body.

[0010] Preferably, a portion of the left push chamber is located inside the left valve body, and another portion of the left push chamber is located inside the left side of the intermediate valve body; A portion of the right push chamber is located inside the right valve body, and another portion of the right push chamber is located inside the right side of the intermediate valve body.

[0011] Preferably, the overflow oil passage is located inside the intermediate valve body.

[0012] Preferably, the overflow port L is located on the intermediate valve body.

[0013] Preferably, a plurality of annular grooves are formed on the circumferential side of the second shoulder, and a plurality of annular grooves are formed on the circumferential side of the third shoulder.

[0014] A hydraulic system for a concrete pump truck pumping mechanism, wherein the hydraulic system for the concrete pump truck pumping mechanism is equipped with the aforementioned simplified hydraulic control directional valve.

[0015] Compared with the prior art, this utility model has the following advantages: 1. This utility model presents a simplified hydraulic directional control valve with a simplified structure, high reliability, and long service life. By optimizing the valve body and valve core structure, it completely eliminates the easily damaged return spring at the control port in traditional hydraulic directional control valves, fundamentally eliminating the failure mode caused by spring failure. The left and right movement of the valve core is purely driven by the pressure difference between the hydraulic control ports X and Y, and precise positioning and holding are achieved through the sliding of the left and right pistons in the left and right push chambers. This design fundamentally eliminates the problem of valve core jamming or return failure caused by spring fatigue, breakage, or plastic deformation, greatly improving the operational reliability of the directional control valve itself.

[0016] 2. The simplified hydraulic directional valve of this utility model has an annular groove on the valve core shoulder (such as the second and third shoulders) which helps to equalize pressure and reduce hydraulic clamping force. This makes the directional valve wear less and significantly enhance its durability under the harsh working conditions of high-frequency directional switching of concrete pump trucks, thus extending the service life of the hydraulic directional valve.

[0017] 3. The simplified hydraulic directional valve of this utility model features a cleverly designed overflow oil passage, which enhances system stability. The overflow port L connects to the inner sides of the left and right push chambers via the overflow oil passage. This design smoothly guides trapped oil or pressurized oil that leaks into the push chamber through the piston sealing gap back to the oil tank, preventing back pressure caused by oil accumulation in the push chamber. This ensures the response speed and positioning accuracy of the valve core, further improving the stability and reliability of the directional valve operation.

[0018] 4. The simplified hydraulic directional valve of this utility model features a modular valve body structure, facilitating processing and maintenance. The valve body adopts a separate combination structure of a middle valve body, a left valve body, and a right valve body. This not only reduces the processing difficulty of individual parts and improves manufacturing precision, but also allows for convenient disassembly and replacement of parts when maintenance is required, resulting in better maintainability.

[0019] 5. The simplified hydraulic control directional valve of this utility model is applied to the hydraulic system of the pumping mechanism of a concrete pump truck. The system performance is optimized, the failure rate is significantly reduced, and the maintenance cost is low. It can fundamentally solve the problem of overall machine reliability caused by the high failure rate of the directional valve in the original system. The continuous working capability of the system is guaranteed, and the pumping action is more stable and reliable. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0021] Figure 1 This is a cross-sectional view of a simplified hydraulic directional valve according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the valve core and piston part in an embodiment of this utility model. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0025] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0028] Example 1 like Figure 1 , Figure 2 As shown, the simplified hydraulic directional valve in this embodiment includes a valve body (middle valve body 11, left valve body 12 and right valve body 13) and a valve core 2.

[0029] The valve body includes a middle valve body 11, a left valve body 12, and a right valve body 13. The left valve body 12 is assembled and connected to the left side of the middle valve body 11, and the right valve body 13 is assembled and connected to the right side of the middle valve body 13. A sealing ring 3 is provided between the left valve body 12 and the left side of the middle valve body 11, and a sealing ring 3 is provided between the right valve body 13 and the right side of the middle valve body 11. The sealing rings 3 ensure the overall sealing performance of the valve body structure.

[0030] The valve body adopts a split combination structure of middle valve body 11, left valve body 12, and right valve body 13, which not only reduces the processing difficulty of individual parts and improves manufacturing precision, but also allows for convenient disassembly and replacement of parts when maintenance is required, resulting in better maintainability.

[0031] A left push chamber 41 is provided on the left side inside the valve body, wherein the left push chamber 41 is at least partially located inside the left valve body 12.

[0032] From left to right, chambers T1, A, P, B, and T2 are sequentially formed in the middle of the valve body. Chambers T1 and T2 are connected by a transition oil passage 51. Chambers T1, A, P, B, and T2 are located inside the intermediate valve body 11, and the transition oil passage 51 is also located inside the intermediate valve body 11.

[0033] A right push chamber 42 is provided on the right side inside the valve body, wherein the right push chamber 42 is at least partially located inside the right valve body 13.

[0034] The valve core cavity is opened from left to right inside the valve body. The valve core cavity is connected to the left push cavity 41, cavity T1, cavity A, cavity P, cavity B, cavity T2 and right push cavity 42 in sequence from left to right.

[0035] The valve body is provided with oil port T, oil port P, oil port A, oil port B, hydraulic control oil port X, hydraulic control oil port Y, and overflow oil port L. Among them, oil port T, oil port P, oil port A, and oil port B are located on the middle valve body 11, hydraulic control oil port X is located on the left valve body 12, and hydraulic control oil port Y is located on the right valve body 13.

[0036] Oil port T is connected to chamber T1, oil port P is connected to chamber P, oil port A is connected to chamber A, oil port B is connected to chamber B, hydraulic control oil port X is connected to the outside of the left push chamber 41, hydraulic control oil port Y is connected to the outside of the right push chamber 42, and overflow oil port L is connected to the inside of the left push chamber 41 and the inside of the right push chamber 42 via overflow oil passage 52.

[0037] A portion of the left push chamber 41 is located inside the left valve body 12, and another portion of the left push chamber 41 is located inside the left side of the intermediate valve body 11. A portion of the right push chamber 42 is located inside the right valve body 13, and another portion of the right push chamber 42 is located inside the right side of the intermediate valve body 11.

[0038] An overflow oil passage 52 is provided on both the left and right sides inside the intermediate valve body 11, and an overflow oil port L is located on the intermediate valve body 11. One end of the left overflow oil passage 52 is connected to the left push chamber 41 inside the left side of the intermediate valve body 11, and the other end of the left overflow oil passage 52 is connected to the overflow oil port L. One end of the right overflow oil passage 52 is connected to the right push chamber 42 inside the right side of the intermediate valve body 11, and the other end of the right overflow oil passage 52 is connected to the overflow oil port L.

[0039] The overflow port L is connected to the inner side of the left push chamber 41 and the right push chamber 42 via the overflow oil passage 52, which can smoothly guide the trapped oil or pressure oil that leaks into the inner side of the push chamber through the sealing gap of the piston 81 back to the oil tank, avoiding back pressure caused by oil accumulation in the push chamber, thereby ensuring the response speed and positioning accuracy of the valve core 2, and further improving the stability and reliability of the directional valve operation.

[0040] The valve core 2 is provided with a first shoulder 61, a first oil groove 71, a second shoulder 62, a second oil groove 72, a third shoulder 63, a third oil groove 73, and a fourth shoulder 64 from left to right. A left piston 81 is provided at the left end of the valve core 2, and a right piston 82 is provided at the right end of the valve core 2.

[0041] Several annular grooves 9 are formed on the circumferential side of the second shoulder 62, and several annular grooves 9 are formed on the circumferential side of the third shoulder 63.

[0042] The annular grooves 9 on the second shoulder 62 and the third shoulder 63 help to equalize pressure and reduce hydraulic clamping force, resulting in less wear and significantly enhanced durability of the directional valve under the harsh working conditions of high-frequency directional switching of concrete pump trucks, thus extending the service life of the hydraulic directional valve.

[0043] The valve core 2 passes through the valve core cavity, the left piston 81 slides in the left push chamber 41, and the right piston 82 slides in the right push chamber 42.

[0044] Oil port T and oil port P are connected to the oil inlet line and oil return line respectively; oil port A and oil port B are connected to the working line respectively; hydraulic control oil port X and hydraulic control oil port Y are connected to the hydraulic control line respectively; and overflow oil port L is connected to the oil tank via the oil return line.

[0045] When the oil pressure at hydraulic control port X is greater than the oil pressure at hydraulic control port Y, the valve core 2 moves to the right relative to the valve body. The first oil groove 71 connects chamber T1 and chamber A, and the second oil groove 72 connects chamber P and chamber B, so that oil port T is connected to oil port A, and oil port P is connected to oil port B.

[0046] When the oil pressure at hydraulic control port Y is greater than the oil pressure at hydraulic control port X, valve core 2 moves to the left relative to valve body. The third oil groove 73 connects chamber T2 and chamber B, and the second oil groove 72 connects chamber P and chamber A, so that oil port T is connected to oil port B, and oil port P is connected to oil port A.

[0047] The simplified hydraulic control directional valve in this embodiment operates as follows: Hydraulic oil at hydraulic control port X acts on the left piston 81, and hydraulic oil at hydraulic control port Y acts on the right piston 82. When the oil pressure at hydraulic control port X is greater than the oil pressure at hydraulic control port Y, the valve core 2 moves to the right relative to the valve body. The first oil groove 71 connects chamber T1 and chamber A, and the second oil groove 72 connects chamber P and chamber B, so that oil port T is connected to oil port A, and oil port P is connected to oil port B. When the oil pressure at hydraulic control port Y is greater than the oil pressure at hydraulic control port X, the valve core 2 moves to the left relative to the valve body. The third oil groove 73 connects chamber T2 and chamber B, and the second oil groove 72 connects chamber P and chamber A, so that oil port T is connected to oil port B, and oil port P is connected to oil port A.

[0048] In this simplified hydraulic directional valve embodiment, the easily damaged return spring at the control port in traditional hydraulic directional valves is completely eliminated during operation, fundamentally eliminating the failure mode of spring failure. The left and right movement of the valve core 2 is purely driven by the pressure difference between the hydraulic control ports X and Y, and precise positioning and holding are achieved by the sliding of the left piston 81 and the right piston 82 in the left and right push chambers.

[0049] Example 2 A hydraulic system for a concrete pump truck pumping mechanism, wherein the hydraulic system for the concrete pump truck pumping mechanism is equipped with the simplified hydraulic control directional valve described in Embodiment 1.

[0050] The present embodiment has now been described in detail with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the simplified hydraulic control directional valve and the hydraulic system of the concrete pump truck pumping mechanism of this utility model. Of course, the above description is only a preferred embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural transformations made using the content of this utility model's specification and drawings under the inventive concept of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model and should be protected by this utility model.

Claims

1. A simplified hydraulic directional control valve, comprising a valve body and a valve core, characterized in that, A left push chamber is opened on the left side of the valve body; The valve body has chambers T1, A, P, B and T2 arranged sequentially from left to right in the middle position inside the valve body. Chambers T1 and T2 are connected by a transition oil passage. A right push chamber is opened on the right side of the valve body; The valve core cavity is opened from left to right inside the valve body. The valve core cavity is connected to the left push cavity, cavity T1, cavity A, cavity P, cavity B, cavity T2 and right push cavity from left to right. The valve body is equipped with oil port T, oil port P, oil port A, oil port B, hydraulic control oil port X, hydraulic control oil port Y and overflow oil port L; Oil port T is connected to chamber T1 or chamber T2, oil port P is connected to chamber P, oil port A is connected to chamber A, oil port B is connected to chamber B, hydraulic control oil port X is connected to the outside of the left push chamber, hydraulic control oil port Y is connected to the outside of the right push chamber, and overflow oil port L is connected to the inside of the left push chamber and the inside of the right push chamber via the overflow oil passage. The valve core is provided with a first shoulder, a first oil groove, a second shoulder, a second oil groove, a third shoulder, a third oil groove, and a fourth shoulder from left to right. A left piston is installed at the left end of the valve core, and a right piston is installed at the right end of the valve core; The valve core passes through the valve core cavity, the left piston slides into the left push cavity, and the right piston slides into the right push cavity; When the oil pressure at hydraulic control port X is greater than the oil pressure at hydraulic control port Y, the valve core moves to the right relative to the valve body, the first oil groove connects chamber T1 and chamber A, and the second oil groove connects chamber P and chamber B; When the oil pressure at hydraulic control port Y is greater than the oil pressure at hydraulic control port X, the valve core moves to the left relative to the valve body, the third oil groove connects chamber T2 and chamber B, and the second oil groove connects chamber P and chamber A.

2. The simplified hydraulic directional valve according to claim 1, characterized in that, The valve body includes a middle valve body, a left valve body and a right valve body. The left valve body is assembled and connected to the left side of the middle valve body, and the right valve body is assembled and connected to the right side of the middle valve body. Chambers T1, A, P, B and T2 are located inside the intermediate valve body, the left push chamber is at least partially located inside the left valve body and the right push chamber is at least partially located inside the right valve body.

3. The simplified hydraulic control directional valve according to claim 2, characterized in that, A sealing ring is provided between the left valve body and the left side of the middle valve body, and a sealing ring is provided between the right valve body and the right side of the middle valve body.

4. The simplified hydraulic directional valve according to claim 2, characterized in that, The transition oil passage is located inside the intermediate valve body.

5. The simplified hydraulic directional valve according to claim 2, characterized in that, Oil ports T, P, A, and B are located on the middle valve body, hydraulic control port X is located on the left valve body, and hydraulic control port Y is located on the right valve body.

6. The simplified hydraulic control directional valve according to claim 2, characterized in that, A portion of the left push chamber is located inside the left valve body, and another portion of the left push chamber is located inside the left side of the middle valve body; A portion of the right push chamber is located inside the right valve body, and another portion of the right push chamber is located inside the right side of the intermediate valve body.

7. The simplified hydraulic control directional valve according to claim 6, characterized in that, The overflow oil passage is located inside the intermediate valve body.

8. The simplified hydraulic directional valve according to claim 7, characterized in that, The overflow port L is located on the intermediate valve body.

9. The simplified hydraulic control directional valve according to claim 1, characterized in that, The second shoulder has several annular grooves on its circumferential side, and the third shoulder has several annular grooves on its circumferential side.

10. A hydraulic system for the pumping mechanism of a concrete pump truck, characterized in that, The hydraulic system of the concrete pump truck pumping mechanism is equipped with a simplified hydraulic control directional valve as described in any one of claims 1 to 9.

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