A pollution-resistant balancing valve device and engineering vehicle

Abstract

This invention relates to an anti-pollution balancing valve device and an engineering vehicle, comprising a balancing valve (1.1) installed in a hydraulic circuit containing a hydraulic cylinder (2), and a filter device (1) installed at the cylinder interface end and the pipeline interface end of the balancing valve (1.1); the filter device comprises a hollow shell (1.2) and a magnetic rod (1.3) screwed inside the shell (1.2); multiple small oil passage holes (1.4) are provided on the shell (1.2) surrounding the magnetic rod (1.3), and an outer protective plate (1.5) with small oil passage holes (1.4) is provided on the outer ring of the shell (1.2), with the positions of the small oil passage holes (1.4) on the shell (1.2) and the outer protective plate (1.5) corresponding to each other; a filter screen (1.6) is provided between the small oil passage holes (1.4) on the shell (1.2) and the outer protective plate (1.5). This invention has a simple structure, good anti-pollution effect, high reliability, long service life, and high safety.

Description

Technical Field

[0001] This invention relates to an anti-pollution balancing valve device and an engineering vehicle, belonging to the field of hydraulic system technology. Background Technology

[0002] A hydraulic cylinder balance valve is a precision hydraulic component that allows forward hydraulic flow to drive the cylinder (actuator) to move (rise). When the cylinder (actuator) descends under gravity, it generates a reaction force to ensure a smooth descent. It can also lift or lower heavy objects at a certain speed and maintain them in a fixed position. Furthermore, in the event of a hydraulic line rupture or severe leakage, the balance valve on the cylinder (actuator) can prevent uncontrolled movement of the load. Therefore, the balance valve allows for bidirectional flow of high-pressure hydraulic oil and is a key component in the hydraulic systems of boom-type construction machinery, concrete pump trucks, mining dump trucks, and other similar equipment.

[0003] Statistics show that approximately 80% of hydraulic system failures are caused by contamination of the circuit. In actual production, contamination is often introduced due to factors such as the operating environment of the equipment, system design defects, and improper maintenance and replacement. During the operation of the hydraulic system, contamination can also occur due to wear and aging of components. In particular, hydraulic cylinders move more frequently than other components, making them more prone to generating solid particulate contaminants from wear in the hydraulic circuit. These contaminants can wear down and jam hydraulic components, leading to hydraulic system failure.

[0004] Currently, hydraulic oil circuit contamination is generally addressed using oil filters. In some cases, complex magnetic adsorption mechanisms are added to further remove iron filings from the oil circuit. However, existing oil filters and magnetic adsorption filtration mechanisms are structurally complex, resulting in heavy, large, and high-pressure-loss filtration devices that are not suitable for applications with specific requirements regarding weight, space, and oil pressure, such as balance valves in boom-type construction machinery, concrete pump trucks, and mining dump trucks. Existing balance valves of this type generally do not have filter devices or only have a simple oil filter at one end. The valve body itself lacks contamination resistance, or only has some contamination resistance in the unidirectional circuit but no resistance in the reverse direction. Overall, their contamination resistance is weak, and their reliability, safety, and service life need further improvement.

[0005] Chinese patent CN212003818U discloses a hydraulic protection circuit. Its technical solution is to add two sets of bypass valves in parallel at both ends of the oil filter. This results in the oil filter being large in size, heavy in weight, and expensive, making it unsuitable for boom-type engineering machinery products, especially for concrete pump truck products.

[0006] Therefore, there is an urgent need for a hydraulic balance valve device with good anti-pollution effect, high reliability, and long service life to ensure the high reliability and high safety of engineering machinery equipment using this device. Summary of the Invention

[0007] The purpose of this invention is to overcome the above-mentioned shortcomings and provide an anti-pollution balancing valve device and engineering vehicle with good anti-pollution effect, high reliability, high safety and long service life.

[0008] The objective of this invention is achieved as follows:

[0009] A pollution-resistant balancing valve device includes a balancing valve installed in a hydraulic circuit containing a hydraulic cylinder, and a filter device installed at both the cylinder interface end and the pipeline interface end of the balancing valve. The filter device includes a hollow shell and a magnetic rod screwed inside the shell. Multiple small oil passage holes are provided on the shell surrounding the magnetic rod, and an outer protective plate with small oil passage holes is provided on the outer ring of the shell. The positions of the small oil passage holes on the shell and the outer protective plate are coaxially aligned. A filter screen is provided between the small oil passage holes on the shell and the outer protective plate.

[0010] Furthermore, the filter device at the cylinder interface of the balance valve also includes a cylinder valve seat with an internal oil passage connecting the hydraulic cylinder and the balance valve; the housing is screwed into the cylinder valve seat, and the magnetic rod, the oil passage hole, and the filter screen are all located within the oil passage.

[0011] Furthermore, the filter device at the pipeline interface of the balance valve also includes an interface pipe screwed onto the outside of the housing; the interface pipe and the inside of the housing are connected to form an oil passage, the oil passage is connected to the balance valve and the reversing valve respectively, and the magnetic rod, the oil passage hole and the filter screen are all located in the oil passage.

[0012] Furthermore, the magnetic rod includes a bolt and a magnetic core disposed on the bolt.

[0013] Furthermore, the magnetic core is a neodymium iron boron magnet.

[0014] Furthermore, the outer protective plate and the housing are aligned by an alignment mechanism to ensure that the positions of the oil passage holes on the outer protective plate and the housing correspond.

[0015] Furthermore, the alignment mechanism includes a positioning groove on the housing and a positioning shoulder on the outer protective plate, wherein the positioning shoulder is embedded in the positioning groove to achieve alignment and positioning.

[0016] Furthermore, the outer protective plate is connected to the housing by welding.

[0017] An engineering vehicle comprising any of the aforementioned anti-pollution balancing valve devices.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The present invention installs a filter device on the interface end of the balance valve, including screen filtration and magnetic rod filtration. The magnetic rod is set in the inner ring of the screen. Its structure is compact and simple, lightweight and small in size, which meets the application requirements of balance valves in engineering machinery such as boom-type engineering machinery, concrete pump trucks, and mining dump trucks.

[0020] 2. The filter screen of the filter device is held and protected by the shell and the outer guard plate, which can withstand high oil pressure. The small oil passage holes and the large oil passage gaps on the shell and the outer guard plate ensure the smooth passage of hydraulic oil with low oil pressure loss. This meets the application requirements of high pressure resistance and low pressure loss of the hydraulic circuit of the balance valve of construction machinery such as boom-type construction machinery, concrete pump trucks, and mining dump trucks.

[0021] 3. The components of the filter device are assembled and connected by threaded connections, which makes disassembly simple, allows for cleaning and repeated use, and makes maintenance convenient and cost-effective.

[0022] 4. Filter devices are installed at both the cylinder interface and the pipeline interface of the balance valve to achieve dual-path filtration. This ensures that the balance valve can effectively filter and resist contamination when oil is introduced in both directions, thus providing bidirectional anti-contamination. This significantly improves the balance valve's anti-contamination capability, operational reliability, and service life. Therefore, engineering vehicles equipped with anti-contamination balance valve devices have high reliability and high safety. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of an anti-pollution balancing valve device according to the present invention.

[0024] Figure 2 This is a schematic diagram of the oil cylinder interface end filter device of the anti-pollution balance valve device of the present invention.

[0025] Figure 3 This is a partially enlarged schematic diagram of the filter screen of an anti-pollution balancing valve device according to the present invention.

[0026] Figure 4 This is a schematic diagram of the pipe interface filter device structure of an anti-pollution balancing valve device according to the present invention.

[0027] Figure 5 This is a partial three-dimensional structural diagram of the filter housing of an anti-pollution balancing valve device according to the present invention.

[0028] Figure 6 This is a schematic diagram of the outer protective plate structure of the filter device of the anti-pollution balancing valve device of the present invention.

[0029] Figure 7 This is a schematic diagram of the connection principle of a split-type balance valve in an anti-pollution balance valve device of the present invention.

[0030] Figure 8 This is a schematic diagram of the integrated balance valve connection principle of an anti-pollution balance valve device according to the present invention.

[0031] in:

[0032] Filter device 1, oil cylinder 2, reversing valve 3;

[0033] Balance valve 1.1, housing 1.2, magnetic rod 1.3, oil passage hole 1.4, outer protective plate 1.5, filter screen 1.6, cylinder valve seat 1.7, interface pipe 1.8, positioning groove 1.2.1, positioning shoulder 1.5.1. Detailed Implementation

[0034] See Figures 1-8 The present invention relates to an anti-pollution balancing valve device, comprising a balancing valve 1.1 installed in a hydraulic circuit containing a hydraulic cylinder 2, and a filter device 1 installed at the cylinder interface end and the pipeline interface end of the balancing valve 1.1 respectively;

[0035] The oil cylinder interface end filter device 1 of the balance valve 1.1 includes an oil cylinder seat 1.7 with an internal oil passage connecting the hydraulic cylinder 2 and the balance valve 1.1, a hollow housing 1.2 screwed into the oil cylinder seat 1.7, and a magnetic rod 1.3 screwed into the housing 1.2. Multiple small oil passages 1.4 are provided on the housing 1.2 surrounding the magnetic rod 1.3. An outer protective plate 1.5 with the small oil passages 1.4 is provided on the outer ring of the housing 1.2. The outer protective plate 1.5 and the housing 1.2 are aligned by an alignment mechanism to ensure that the positions of the small oil passages 1.4 on the housing 1.2 and the outer protective plate 1.5 are coaxially aligned. The structure includes a positioning groove 1.2.1 on the housing 1.2 and a positioning shoulder 1.5.1 on the outer protective plate 1.5. The positioning shoulder 1.5.1 is embedded in the positioning groove 1.2.1 to achieve alignment and positioning. A filter screen 1.6 is provided between the oil passage hole 1.4 of the housing 1.2 and the outer protective plate 1.5. The outer protective plate 1.5 and the housing 1.2 are connected by welding to ensure that the filter screen 1.6 can withstand the high pressure of hydraulic oil. The magnetic rod 1.3, the oil passage hole 1.4, and the filter screen 1.6 are all located in the oil passage of the cylinder valve seat 1.7. The magnetic rod 1.3 includes a bolt and a neodymium iron boron magnet core provided on the bolt.

[0036] The filter device 1 at the pipeline interface of the balance valve 1.1 includes a hollow housing 1.2, an interface pipe 1.8 screwed outside the housing 1.2, and a magnetic rod 1.3 screwed inside the housing 1.2. Multiple small oil passage holes 1.4 are provided on the housing 1.2 surrounding the magnetic rod 1.3. An outer protective plate 1.5 with oil passage holes 1.4 is provided on the outer ring of the housing 1.2. The outer protective plate 1.5 and the housing 1.2 are aligned by an alignment mechanism to ensure that the positions of the oil passage holes 1.4 on the housing 1.2 and the outer protective plate 1.5 are coaxially aligned. The alignment mechanism includes a positioning groove 1.2.1 on the housing 1.2 and a positioning groove 1.2.1 on the outer protective plate 1.5. A positioning shoulder 1.5.1 is embedded in a positioning groove 1.2.1 to achieve alignment and positioning. A filter screen 1.6 is provided between the oil passage hole 1.4 of the housing 1.2 and the outer protective plate 1.5. The outer protective plate 1.5 and the housing 1.2 are connected by welding to ensure that the filter screen 1.6 can withstand the high pressure of hydraulic oil. The interface pipe 1.8 and the interior of the housing 1.2 are connected to form an oil passage. The oil passage is connected to the balance valve 1.1 and the reversing valve 3 respectively. The magnetic rod 1.3, the oil passage hole 1.4, and the filter screen 1.6 are all located in the oil passage. The magnetic rod 1.3 includes a bolt and a neodymium iron boron magnet core set on the bolt.

[0037] The present invention relates to an engineering vehicle comprising any of the above-mentioned anti-pollution balance valve devices. The balance valve 1.1 is a split balance valve or an integrated balance valve. The cylinder interface end of the balance valve 1.1 is connected to the cylinder 2 through a filter device 1 composed of a filter screen 1.6 and a magnetic rod 1.3. The pipeline interface end of the balance valve is connected to the reversing valve 3 through a filter device 1 composed of a filter screen 1.6 and a magnetic rod 1.3.

[0038] During operation, the reversing valve 3 controls the oil cylinder 2 to enter or exit oil, and the balance valve 1.1 controls the stable change of oil pressure in the cylinder 2 cavity, so as to realize the smooth operation of the cylinder 2's moving end extending or retracting. The filter device 1 set at both ends of the balance valve 1.1 ensures the bidirectional anti-pollution capability of the balance valve 1.1 when entering oil in both directions, which greatly improves its working reliability and service life.

[0039] Since a boom-type engineering equipment often needs to be equipped with dozens of balance valves at the same time, in order to further save costs, the filter device 1, which includes a filter screen 1.6 and a magnetic rod 1.3, can be installed in important positions, while simplified filter devices 1, such as those containing only a filter screen 1.6 or only a magnetic rod 1.3, can be selectively installed in other less important positions.

[0040] Additionally, it should be noted that the above-described specific implementation is merely an optimized solution of this patent, and any modifications or improvements made by those skilled in the art based on the above concept are within the scope of protection of this patent.

Claims

1. A pollution-resistant counterbalance valve arrangement comprising a counterbalance valve (1) mounted in a hydraulic circuit containing a hydraulic ram (2) 1.1), characterized in that: The oil cylinder interface end and the pipeline interface end of the balance valve (1.1) are respectively provided with a filter device (1); the filter device of the oil cylinder interface end and the pipeline interface end both comprise a hollow shell (1.2), and a magnetic bar (1.3) is arranged in the shell (1.2); a plurality of oil passing holes (1.4) are arranged on the shell (1.2) surrounding the magnetic bar (1.3), and an outer guard plate (1.5) with the oil passing holes (1.4) is arranged on the outer ring of the shell (1.2), and the oil passing holes (1.4) on the shell (1.2) and the outer guard plate (1.5) are coaxially aligned; a filter screen (1.6) is arranged between the oil passing holes (1.4) of the shell (1.2) and the outer guard plate (1.5); The filter device (1) of the oil cylinder interface end of the balance valve (1.1) further comprises an oil cylinder valve seat (1.7) provided with a communication passage between the hydraulic oil cylinder (2) and the balance valve (1.1); the shell (1.2) is arranged in the oil cylinder valve seat (1.7), and the magnetic bar (1.3), the oil passing hole (1.4) and the filter screen (1.6) are all arranged in the oil passing passage in the oil cylinder valve seat (1.7); The outer guard plate (1.5) and the shell (1.2) are aligned in position through an alignment mechanism, so that the oil passing holes (1.4) on the outer guard plate (1.5) and the shell (1.2) correspond in position; the alignment mechanism comprises a positioning groove (1.2.1) arranged on the shell (1.2) and a positioning shoulder (1.5.1) arranged on the outer guard plate (1.5), and the positioning shoulder (1.5.1) is embedded in the positioning groove (1.2.1) to realize alignment positioning.

2. The anti-contamination equalizing valve device of claim 1, wherein: The filter device (1) of the pipeline interface end of the balance valve (1.1) further comprises an interface pipe (1.8) arranged outside the shell (1.2); the interface pipe (1.8) and the inside of the shell (1.2) are in communication to form an oil passing passage, the interface pipe (1.8) and the oil passing passage in the shell (1.2) are respectively connected with the balance valve (1.1) and the reversing valve (3), and the magnetic bar (1.3), the oil passing hole (1.4) and the filter screen (1.6) are all arranged in the oil passing passage in the interface pipe (1.8) and the shell (1.2).

3. The anti-contamination equalizing valve apparatus of claim 1, wherein: The magnetic bar (1.3) comprises a bolt and a magnetic core arranged on the bolt.

4. The pollution-resistant equalizing valve apparatus of claim 3, wherein: The magnetic core is a ferrum-boron magnet.

5. The pollution-resistant equalizing valve apparatus of claim 1, wherein: The outer guard plate (1.5) and the shell (1.2) are connected through welding.

6. An engineering vehicle characterized by: The anti-pollution balance valve device comprises any one of the filter devices according to claims 1 to 5.

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