Working device pipe explosion anti-sedimentation system and engineering machinery comprising same
By designing a combined valve block including a balance valve, an overflow valve, a shut-off valve, a check valve and a pressure reducing valve in engineering machinery, the vibration problem during the descending of the mechanical connecting rod main control valve is solved, and the stable operation of the working device and the anti-settlement function during the bursting of the pipe is achieved, which improves the stability and safety of the equipment.
Patent Information
- Application Number
- CN202422175734.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-08-08
- Estimated Expiration
- 2034-09-04
AI Technical Summary
When existing construction machinery uses mechanical connecting rod main control valves, there is unstable vibration during the downward process of the working device, which may lead to equipment vibration, noise increase, early failure of parts, and even safety accidents.
Design a working device explosion pipe anti-settlement system, including a combination valve block of a balance valve, an overflow valve, a shut-off valve, a check valve, a check valve, a sequential valve and a pressure reducing valve. By optimizing the hydraulic oil circuit design, the working device descends and prevents settlement during explosion pipes.
It effectively reduces vibration during the downward flow of the working device, prevents settlement during the pipe explosion, improves the working performance and service life of the equipment, and ensures safety.
Smart Images
Figure CN223203386U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of machinery, in particular to the technical field of engineering machinery, and more specifically to a pipe burst anti-settling system for a working device. Background Art
[0002] For safety reasons, some construction machinery on the market (such as but not limited to hydraulic excavators, backhoe loaders or hydraulic loaders, etc.) are equipped with explosion-proof valves. When abnormal conditions occur during the operation of the construction machinery (such as excessive pressure, overheated oil temperature, etc.), the explosion-proof valve can automatically close the oil circuit in the event of oil supply pipeline failure, thereby preventing damage to the equipment and ensuring the safety of the operator.
[0003] Existing explosion-proof valves are typically implemented using counterbalance valves. When the working device is lowered, pilot oil opens the counterbalance valve, allowing working pressure oil to flow through the counterbalance valve's main spool. If a pipe bursts at this point, the descent speed must not exceed twice the initial velocity, as required by ISO8643. When the working device is raised, working pressure oil flows directly through the counterbalance valve's main spool. If a pipe bursts at this point, the working device must immediately stop and maintain its current position.
[0004] If construction machinery uses a mechanical linkage main control valve without a hydraulic pilot system, conventional explosion-proof valves rely solely on main system pressure oil to open the counterbalance valve spool during the lowering of the working device. However, due to the significant load fluctuations during the lowering of the working device, the counterbalance valve becomes unstable, potentially causing continuous vibration of the working device. When the vibration exceeds the allowable range, the mechanical equipment will generate significant dynamic loads and noise, affecting its performance and service life. In extreme cases, it may even lead to premature failure of components, resulting in serious safety accidents. Utility Model Content
[0005] In order to solve one or more of the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides a working device pipe burst anti-subsidence system, characterized in that the working device pipe burst anti-subsidence system includes: a balancing valve, the first end of the balancing valve is connected to the first access port of the main control valve; a relief valve and a stop valve, the first ends of the relief valve and the stop valve are respectively connected to the first access port of the oil cylinder; a first one-way valve, a sequence valve and a second one-way valve, the first ends of the first one-way valve, the sequence valve and the second one-way valve are respectively connected to the second access port of the oil cylinder; and a pressure reducing valve, the first end of the pressure reducing valve is connected to the second access port of the main control valve.
[0006] Preferably, the second end of the balancing valve is connected to the first ends of the overflow valve and the stop valve.
[0007] Preferably, the second ends of the overflow valve and the stop valve are respectively connected to the second end of the first one-way valve.
[0008] Preferably, the second ends of the sequence valve and the second one-way valve are respectively connected to the first end of the pressure reducing valve.
[0009] Preferably, the second end of the pressure reducing valve is connected to the third end of the sequence valve.
[0010] Preferably, the third end of the balancing valve is connected to the third end of the sequence valve and the second end of the pressure reducing valve.
[0011] Preferably, when the working device descends, the hydraulic oil input from the main control valve enters the second inlet of the main control valve to establish working pressure, and the oil passes through the pressure reducing valve and enters the pilot port of the balancing valve and the sequence valve; when the working pressure is established, the balancing valve and the sequence valve are in an open state, and the pressure oil enters the large chamber of the cylinder through the sequence valve and the second inlet of the cylinder, and the oil in the small chamber of the cylinder returns to the main control valve through the second inlet of the cylinder and the balancing valve, and the working device descends.
[0012] Preferably, when the working device rises, the hydraulic oil input from the main control valve enters the first inlet of the main control valve, enters the small chamber of the oil cylinder through the balancing valve, and the oil in the large chamber of the oil cylinder returns to the main control valve through the second one-way valve; if the first inlet of the main control valve bursts, the balancing valve supports the weight of the working device and the working device stops moving.
[0013] According to another aspect of the present invention, there is provided an engineering machine, characterized in that it includes the above items.
[0014] Preferably, the engineering machinery includes: a hydraulic excavator, an excavator loader or a hydraulic loader.
[0015] The work device pipe burst settlement system provided by this utility model not only solves the vibration problem encountered during the lowering of the boom of construction machinery using a mechanical linkage main control valve, as described in the prior art, but also prevents settlement when a pipe burst occurs in the work device (such as, but not limited to, the boom of an excavator). The work device pipe burst settlement system provided by this utility model can also be used with pilot-controlled machines.
[0016] The pipe bursting and settling system of the working device provided by the utility model is a combined valve block, which can integrate multiple valve cores in one valve block, thereby facilitating the arrangement of components and pipelines and saving time and cost.
[0017] The working device pipe bursting and settling system provided by the utility model also has functions such as overload protection and manual pressure relief.
[0018] The details of one or more embodiments are set forth in the accompanying drawings and the description below. Other features and advantages will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The following will describe exemplary embodiments of the present invention in more detail with reference to the accompanying drawings. For clarity, identical components in different drawings are indicated by the same reference numerals. In addition, those skilled in the art will appreciate that the specific embodiments shown in the drawings are merely exemplary and are not intended to limit the scope of the present invention, and the drawings of the present invention are not necessarily drawn to scale.
[0020] Figure 1 It is a system principle diagram of the pipe burst anti-settling system of the working device according to the utility model. DETAILED DESCRIPTION
[0021] The following is a detailed description of an exemplary embodiment of the present invention in conjunction with the accompanying drawings. For the sake of clarity and brevity, the actual embodiments are not limited to the technical features described in the specification. It should be noted that in the process of improving and modifying any actual embodiment, in order to achieve a specific goal, the process of improvement and modification may be very complicated and time-consuming, but this is still a conventional technical means for those skilled in the art who know the benefits of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and process are given, but the scope of protection of the present invention includes but is not limited to the following embodiments.
[0022] Certain terms are used throughout this document to refer to specific system components. As those skilled in the art will recognize, different names can often be used to refer to the same component, and thus this document does not intend to distinguish between components that differ only in name and not in function. Throughout this document, the terms "including," "comprising," and "having" are used in an open-ended manner and should be interpreted to mean "including, but not limited to..."
[0023] The present invention is mainly used for hydraulic excavators, backhoe loaders or hydraulic loaders, but the present invention is not limited thereto and can also be extended to other engineering machinery or other machinery equipped with similar working devices.
[0024] The utility model discloses a pipe burst anti-settling system for a working device, which comprises a balancing valve 1, a relief valve 2, a stop valve 3, a one-way valve 4, a sequence valve 5, a one-way valve 6 and a pressure reducing valve 7.
[0025] According to the utility model, Figure 1The A port and B port shown in the figure are respectively connected to the main control valve, and the BD port and BU port are respectively connected to the oil cylinder. When the pressure oil enters the A port, the working device descends, and when the pressure oil enters the B port, the working device rises.
[0026] like Figure 1 As shown, the first end (outlet) of the balancing valve 1 is connected to the first inlet B of the main control valve, the second end (inlet) of the balancing valve 1 is connected to the first end (inlet) of the relief valve 2 and the first end (inlet) of the stop valve 3, and the third end (pilot signal port) of the balancing valve 1 is connected to the third end (control port) of the sequence valve 5 and the second end (outlet) of the pressure reducing valve 7.
[0027] Depend on Figure 1 As can be seen, the first end (inlet) of the relief valve 2 and the first end of the stop valve 3 are also connected to the first inlet BU of the oil cylinder. The second end (outlet) of the relief valve 2 and the second end (outlet) of the stop valve 3 are respectively connected to the second end (outlet) of the first one-way valve 4.
[0028] The first end (inlet) of the first one-way valve 4, the first end (outlet) of the sequence valve 5, and the first end (outlet) of the second one-way valve 6 are respectively connected to the second inlet BD of the oil cylinder. The second end (inlet) of the sequence valve 5 and the second end (inlet) of the second one-way valve 6 are respectively connected to the first end (inlet) of the pressure reducing valve 7.
[0029] The first end of the pressure reducing valve 7 of the present invention is connected to the second inlet A of the main control valve, and the second end (outlet) of the pressure reducing valve 7 is connected to the third end (control port) of the sequence valve 5 .
[0030] According to a preferred embodiment of the present invention, port BD is connected to the large chamber, and port BU is connected to the small chamber. The cylinder extends to control the lowering of a working device (such as, but not limited to, the boom of an excavator). When the working device is lowered, hydraulic oil input from the main control valve enters the main control valve's second inlet A to build working pressure. The oil then passes through the pressure reducing valve 7 and enters the pilot ports of the balancing valve 1 and the sequence valve 5. Once working pressure is established, the balancing valve 1 and the sequence valve 5 are opened, allowing the pressurized oil to enter the large chamber of the cylinder through the sequence valve 5 and the cylinder's second inlet BD. The oil in the small chamber of the cylinder returns to the main control valve through the cylinder's second inlet BD and the balancing valve 1, causing the working device to descend.
[0031] According to another preferred embodiment of the present invention, the opening pressure of balancing valve 1 is set slightly lower than that of sequence valve 5. This ensures that when sequence valve 5 opens, balancing valve 1 is also always open. Furthermore, the set pressure of pressure-reducing valve 7 is slightly higher than the opening pressure of sequence valve 5. This prevents load pressure fluctuations from causing frequent opening and closing of sequence valve 5 or balancing valve 1, which could cause vibration. According to ISO 8643, if a pipe bursts at port B during this period, the average descent speed of the working device within two seconds must not exceed twice the initial velocity.
[0032] According to another preferred embodiment of the present invention, when the working device (such as but not limited to the boom of an excavator) rises, the hydraulic oil input from the main control valve enters the first inlet B of the main control valve, passes through the balancing valve (1) and then enters the small chamber of the oil cylinder, and the oil in the large chamber of the oil cylinder returns to the main control valve through the one-way valve 6; if the first inlet B of the main control valve bursts at this time, the balancing valve 1 supports the weight of the working device, and the working device stops moving and will not continue to descend.
[0033] According to another preferred embodiment of the present invention, all leaked oil from the valve core is returned to the oil tank through port T. Relief valve 2 serves as a safety valve for the working device of the present invention, and its set point is generally higher than the overflow pressure of the main system. Stop valve 3 is used for manual pressure relief. Check valve 4 is used to directly replenish oil from the oil tank when the working device descends and the system flow is insufficient.
[0034] According to another aspect of the present invention, there is provided an engineering machine, characterized in that it comprises the pipe bursting and settling system for the working device as described in the above items.
[0035] Preferably, the engineering machinery includes: a hydraulic excavator, an excavator loader or a hydraulic loader
[0036] The work device pipe burst settlement system provided by this utility model not only solves the vibration problem encountered during the lowering of the boom of construction machinery using a mechanical linkage main control valve, as described in the prior art, but also prevents settlement when a pipe burst occurs in the work device (such as, but not limited to, the boom of an excavator). The work device pipe burst settlement system provided by this utility model can also be used with pilot-controlled machines.
[0037] The pipe bursting and settling system of the working device provided by the utility model is a combined valve block, which can integrate multiple valve cores in one valve block, thereby facilitating the arrangement of components and pipelines and saving time and cost.
[0038] The working device pipe bursting and settling system provided by the utility model also has functions such as overload protection and manual pressure relief.
[0039] The foregoing disclosure of the embodiments of the present disclosure has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the present disclosure to the precise forms disclosed. In light of the foregoing disclosure, many variations and modifications of the embodiments described herein will be apparent to those of ordinary skill in the art. Please note that the foregoing examples are not intended to be limiting. Additional embodiments of devices and apparatuses that may include many of the features described above are also contemplated. Other devices, apparatuses, features, and advantages of the present disclosure will become more apparent to those of skill in the art upon examination of the drawings and detailed description. It is intended that all such other devices, apparatuses, features, and advantages be included within the scope of protection of the present invention.
[0040] Unless specifically stated otherwise or understood otherwise within the context of use, conditional language such as "can," "may," "might," or "could" is generally intended to convey that certain embodiments may, but are not required to, include certain features and / or elements. Thus, such conditional language is generally not intended to imply that one or more embodiments must in any way include the described features and / or elements.
Claims
1. A working device pipe burst anti-settling system, characterized by: The working device pipe burst anti-settling system includes: A balancing valve (1), wherein a first end of the balancing valve (1) is connected to a first inlet (B) of the main control valve; A relief valve (2) and a stop valve (3), wherein first ends of the relief valve (2) and the stop valve (3) are respectively connected to a first inlet (BU) of the oil cylinder; a first one-way valve (4), a sequence valve (5) and a second one-way valve (6), wherein the first ends of the first one-way valve (4), the sequence valve (5) and the second one-way valve (6) are respectively connected to the second inlet (BD) of the oil cylinder; and A pressure reducing valve (7), wherein a first end of the pressure reducing valve (7) is connected to a second inlet (A) of the main control valve.
2. The working device pipe burst anti-settling system according to claim 1, characterized in that: The second end of the balancing valve (1) is connected to the first ends of the overflow valve (2) and the stop valve (3).
3. The working device pipe burst anti-settling system according to any one of claims 1-2, characterized in that: The second ends of the overflow valve (2) and the stop valve (3) are respectively connected to the second end of the first one-way valve (4).
4. The working device pipe burst anti-settling system according to any one of claims 1-2, characterized in that: The second ends of the sequence valve (5) and the second one-way valve (6) are respectively connected to the first end of the pressure reducing valve (7).
5. The working device pipe burst anti-settling system according to claim 4, characterized in that: The second end of the pressure reducing valve (7) is connected to the third end of the sequence valve (5).
6. The working device pipe burst anti-settling system according to claim 2, characterized in that: The third end of the balancing valve (1) is connected to the third end of the sequence valve (5) and the second end of the pressure reducing valve (7).
7. The working device pipe burst anti-settling system according to claim 6, characterized in that: When the working device descends, the hydraulic oil input from the main control valve enters the second inlet (A) of the main control valve to establish working pressure, and the oil passes through the pressure reducing valve (7) and enters the pilot port of the balancing valve (1) and the sequence valve (5); when the working pressure is established, the balancing valve (1) and the sequence valve (5) are in an open state, and the pressure oil passes through the sequence valve (5) and the second inlet (BD) of the oil cylinder and enters the large chamber of the oil cylinder, and the oil in the small chamber of the oil cylinder returns to the main control valve through the second inlet (BD) of the oil cylinder and the balancing valve (1), and the working device descends.
8. The working device pipe burst anti-settling system according to claim 6, characterized in that: When the working device rises, the hydraulic oil input from the main control valve enters the first inlet (B) of the main control valve, passes through the balancing valve (1) and then enters the small chamber of the oil cylinder, and the oil in the large chamber of the oil cylinder passes through the second one-way valve (6) and returns to the main control valve; if the first inlet (B) of the main control valve bursts, the balancing valve (1) supports the weight of the working device and the working device stops moving.
9. An engineering machine, characterized in that: It comprises the working device pipe burst anti-settling system according to any one of claims 1-8.
10. The engineering machine according to claim 9, characterized in that: The engineering machinery includes: a hydraulic excavator, an excavator loader or a hydraulic loader.