Vibration valve group for open type vibration hydraulic system of light double-steel-wheel road roller

Abstract

The utility model relates to the technical field of a hydraulic system of a road roller, and discloses a vibration valve group for an open type vibration hydraulic system of a light double-drum road roller, which is internally provided with an overflow valve, a first two-position four-way electromagnetic directional valve, a second two-position four-way electromagnetic directional valve, a first vibration absorption valve and a second vibration absorption valve, the end 1 of the overflow valve is communicated with the oil inlet P, and the end 2 of the overflow valve is communicated with the oil return port T; a P1 port of the first two-position four-way electromagnetic directional valve is communicated with an oil inlet P, a T1 port of the first two-position four-way electromagnetic directional valve is communicated with a P2 port of the second two-position four-way electromagnetic directional valve, an A1 port of the first two-position four-way electromagnetic directional valve is communicated with an oil outlet A, and a B1 port of the first two-position four-way electromagnetic directional valve is communicated with an oil inlet B; a P2 port of the second two-position four-way electromagnetic directional valve is communicated with a T1 port of the first two-position four-way electromagnetic directional valve, a T2 port of the second two-position four-way electromagnetic directional valve is communicated with an oil return port T, an A2 port of the second two-position four-way electromagnetic directional valve is communicated with an oil outlet C, and a B2 port of the second two-position four-way electromagnetic directional valve is communicated with an oil inlet D. The utility model has the advantages of simple oil path, low manufacturing cost, less sealing ring belts and strong anti-pollution capability.

Description

Technical Field

[0001] This utility model relates to the technical field of hydraulic systems for road rollers, and more specifically to a vibration valve group for an open vibration hydraulic system of a light-duty double-drum road roller. Background Technology

[0002] With the increasing demand for rapid construction of small and medium-sized roads, the use of light-duty double-drum vibratory rollers (under 6 tons) is becoming more and more common. For light-duty double-drum vibratory rollers, using a closed-loop hydraulic system would result in excessively high costs. Therefore, current light-duty double-drum vibratory rollers generally adopt an open-loop hydraulic system, replacing the original piston pump and piston motor with a gear pump and gear motor. The open-loop hydraulic vibration system mainly consists of a gear pump, gear motor, and control valves. This system is widely used due to its simple structure, low price, and low requirements for oil quality. However, during the shutdown process, the inertia of the vibrating motor causes significant impact on the hydraulic system, seriously affecting the road construction quality and the service life of the hydraulic system. Furthermore, existing open-loop hydraulic vibration systems generally only allow for two working modes: simultaneous vibration of the front and rear drums (dual vibration) and simultaneous shutdown (shutdown). However, current road construction sometimes requires single vibration, sometimes dual vibration, and multiple working modes, with short and rapid shutdown operations. Conventional vibration valve assemblies cannot achieve these multiple working modes.

[0003] To address this, existing technologies have developed a vibration hydraulic system capable of achieving single vibration of the front wheel, single vibration of the rear wheel, and dual vibration of both front and rear wheels. For example, Chinese patent document CN215482124U discloses an open vibration hydraulic system for a double-drum road roller and its vibration control valve group. The vibration control valve group includes a first relief valve 201 (V1), a second relief valve 202 (V2), a third relief valve 203 (V3), a fourth relief valve 204 (V4), a first directional valve 205 (Y1), and a second directional valve 206 (Y2). All relief valves are hydraulically piloted, and the directional valves are all pilot control valves. This system suffers from numerous problems, such as complex oil circuits, high manufacturing costs, numerous sealing rings, and weak anti-contamination capabilities. Utility Model Content

[0004] In view of this, the present invention provides a vibration valve group for an open vibration hydraulic system of a lightweight double drum roller, which optimizes the structure of the oil circuit and achieves the goals of simple oil circuit, low manufacturing cost, fewer sealing rings and strong anti-pollution ability.

[0005] To achieve the above objectives, the present invention provides a vibration valve group for an open vibration hydraulic system of a light double drum road roller, comprising an oil inlet P, an oil return T, an oil outlet A, an oil inlet B, an oil outlet C, and an oil inlet D. The vibration valve group is equipped with an overflow valve, a first two-position four-way solenoid directional valve, a second two-position four-way solenoid directional valve, a first vibration cessation valve, and a second vibration cessation valve.

[0006] One end of the overflow valve is connected to the P oil inlet, and the other end is connected to the T oil return port.

[0007] The P1 port of the first two-position four-way solenoid directional valve is connected to the P inlet port, the T1 port is connected to the P2 port of the second two-position four-way solenoid directional valve, the A1 port is connected to the A outlet port, and the B1 port is connected to the B inlet port.

[0008] The P2 port of the second two-position four-way solenoid directional valve is connected to the T1 port of the first two-position four-way solenoid directional valve, the T2 port is connected to the T return port, the A2 port is connected to the C outlet port, and the B2 port is connected to the D inlet port.

[0009] One end of the first vibration-damping valve is connected to the oil inlet B, and the other end is connected to the oil outlet A.

[0010] The second vibration valve has one end connected to the D oil inlet and the other end connected to the C oil outlet.

[0011] Preferably, both the P oil inlet and the T oil return port are connected to the oil tank, and a hydraulic pump is installed on the pipeline connecting the P oil inlet and the oil tank.

[0012] Preferably, both oil outlet A and oil inlet B are connected to the first hydraulic motor, with oil outlet A connected to the oil inlet of the first hydraulic motor and oil inlet B connected to the oil outlet of the first hydraulic motor.

[0013] Preferably, both the C oil outlet and the D oil inlet are connected to the second hydraulic motor, the C oil outlet is connected to the oil inlet of the second hydraulic motor, and the D oil inlet is connected to the oil outlet of the second hydraulic motor.

[0014] Preferably, the overflow valve is a direct-acting overflow valve.

[0015] As can be seen from the above technical solution, compared with the prior art, the vibration valve group for the open vibration hydraulic system of the lightweight double drum roller provided by this utility model has the following beneficial effects:

[0016] 1. Multi-mode switching: Through the combined control of dual two-position four-way solenoid valves, the system can realize four working conditions: dual-wheel vibration stop, dual-wheel vibration, front wheel single vibration, and rear wheel single vibration, to meet the needs of different construction scenarios.

[0017] 2. Simple oil circuit: Compared with the existing technology, this utility model optimizes the oil circuit structure of hydraulic oil, reduces manufacturing costs, reduces 3 overflow valves, and reduces the risk of leakage;

[0018] 3. Enhanced anti-contamination capability: The hydraulic motor is directly controlled by an electromagnetic directional valve. The direct-control electromagnetic directional valve does not require a pilot oil circuit, reducing the hydraulic oil contamination path and the number of sealing rings, thus reducing the probability of seal failure due to particulate contamination. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the vibration valve assembly used in the open vibration hydraulic system of a lightweight double-drum road roller according to this utility model.

[0021] Explanation of reference numerals in the attached diagram: 1-oil tank, 2-hydraulic pump, 3-vibration valve assembly, 4-first hydraulic motor, 5-second hydraulic motor, 301-relief valve, 302-first two-position four-way solenoid directional valve, 303-second two-position four-way solenoid directional valve, 304-first vibration damping valve, 305-second vibration damping valve, 306-P oil inlet, 307-T oil return port, 308-A oil outlet, 309-B oil inlet, 310-C oil outlet, 311-D oil inlet. 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. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of an exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0023] Please see the appendix Figure 1 This invention discloses a vibration valve assembly for an open-type vibration hydraulic system of a lightweight double-drum road roller.

[0024] like Figure 1As shown, the vibration valve assembly 3 provided by this utility model includes an oil inlet 306 (P), an oil return 307 (T), an oil outlet 308 (A), an oil inlet 309 (B), an oil outlet 310 (C), and an oil inlet 311 (D). The vibration valve assembly 3 is equipped with an overflow valve 301, a first two-position four-way solenoid directional valve 302, a second two-position four-way solenoid directional valve 303, a first vibration damping valve 304, and a second vibration damping valve 305.

[0025] The relief valve 301 is a direct-acting relief valve with adjustable opening pressure. Its 1st end (inlet end) is connected to the P oil inlet 306, and its 2nd end (outlet end) is connected to the T oil return port 307.

[0026] The P1 port of the first two-position four-way solenoid directional valve 302 is connected to the P inlet port 306, the T1 port is connected to the P2 port of the second two-position four-way solenoid directional valve 303, the A1 port is connected to the A outlet port 308, and the B1 port is connected to the B inlet port 309; the P2 port of the second two-position four-way solenoid directional valve 303 is connected to the T1 port of the first two-position four-way solenoid directional valve 302, the T2 port is connected to the T return port 307, the A2 port is connected to the C outlet port 310, and the B2 port is connected to the D inlet port 311.

[0027] The first and second two-position four-way solenoid directional valve 302 and the second two-position four-way solenoid directional valve 303 have a K-type depotential function, which has an unloading effect.

[0028] The first vibration-damping valve 304 has one end (outlet end) connected to the B oil inlet 309 and the other end (inlet end) connected to the A oil outlet 308; the second vibration-damping valve 305 has one end (outlet end) connected to the D oil inlet 311 and the other end (inlet end) connected to the C oil outlet 310.

[0029] Both the first vibration extinguishing valve 304 and the second vibration extinguishing valve 305 have adjustable vibration extinguishing duration.

[0030] Both the P-inlet 306 and the T-outlet 307 are connected to the oil tank 1, and a hydraulic pump 2 is installed on the pipeline connecting the P-inlet 306 and the oil tank 1.

[0031] Both the A oil outlet 308 and the B oil inlet 309 are connected to the first hydraulic motor 4. The A oil outlet 308 is connected to the oil inlet of the first hydraulic motor 4, and the B oil inlet 309 is connected to the oil outlet of the first hydraulic motor 4.

[0032] Both the C-outlet 310 and the D-inlet 311 are connected to the second hydraulic motor 5. The C-outlet 310 is connected to the inlet of the second hydraulic motor 5, and the D-inlet 311 is connected to the outlet of the second hydraulic motor 5.

[0033] The working process of the vibration valve group in the open vibration hydraulic system of the lightweight double drum road roller of this utility model is as follows:

[0034] 1. Dual-wheel vibration stop condition:

[0035] Hydraulic oil output from hydraulic pump 2 enters P inlet 306. When the first two-position four-way solenoid directional valve 302 and the second two-position four-way solenoid directional valve 303 are de-energized, the P1 port of the first two-position four-way solenoid directional valve 302 is connected to the T1 port, and the P2 port of the second two-position four-way solenoid directional valve 303 is connected to the T2 port. The hydraulic oil flows from P inlet 306 through the internal oil circuit nodes P1, T1, P2, and T2 of the vibration valve group, and finally returns to the oil tank 1 through T return port 307. During the above process, the first hydraulic motor 4 and the second hydraulic motor 5 do not work, and the front and rear wheels are in a stopped state.

[0036] 2. Dual-wheel vibration condition:

[0037] The hydraulic oil output by hydraulic pump 2 enters the P inlet port 306. When the first two-position four-way solenoid directional valve 302 and the second two-position four-way solenoid directional valve 303 are energized, the P1 port of the first two-position four-way solenoid directional valve 302 is connected to the A1 port and the T1 port is connected to the B1 port, and the P2 port of the second two-position four-way solenoid directional valve 303 is connected to the A2 port and the T2 port is connected to the B2 port. Hydraulic oil enters the first hydraulic motor 4 through the P inlet 306, then sequentially through the P1 port, A1 port, and A outlet 308, thereby driving the first hydraulic motor 4 to rotate and causing the front wheel to vibrate. Then, the hydraulic oil in the first hydraulic motor 4 enters the vibration valve group 3 through the B inlet 309. The hydraulic oil then enters the second hydraulic motor 5 through the B inlet 309, then sequentially through the B1 port, T1 port, P2 port, A2 port, and C outlet 310, thereby driving the second hydraulic motor 5 to rotate and causing the rear wheel to vibrate. Then, the hydraulic oil in the second hydraulic motor 5 enters the vibration valve group 3 through the D inlet 311. The hydraulic oil then returns to the oil tank 1 through the D inlet 311, then sequentially through the B2 port, T2 port, and T return port 307. During the above process, the first hydraulic motor 4 and the second hydraulic motor 5 work simultaneously, and the front and rear wheels are in a state of simultaneous vibration.

[0038] 3. Front wheel vibration followed by rear wheel stoppage:

[0039] The hydraulic oil output by hydraulic pump 2 enters the P inlet port 306. The first two-position four-way solenoid directional valve 302 is energized, and the second two-position four-way solenoid directional valve 303 is de-energized. At this time, the P1 port of the first two-position four-way solenoid directional valve 302 is connected to the A1 port and the T1 port is connected to the B1 port. The P2 port of the second two-position four-way solenoid directional valve 303 is connected to the T2 port and the B2 port is disconnected. Hydraulic oil enters the first hydraulic motor 4 through the P inlet 306, P1, A1, and A outlet 308 in sequence, thereby driving the first hydraulic motor 4 to rotate and causing the front wheel to vibrate. Then, the hydraulic oil in the first hydraulic motor 4 enters the vibration valve group 3 through the B inlet 309. The hydraulic oil returns to the oil tank 1 through the B inlet 309 through the B1, T1, P2, T2, and T return ports 307 in sequence. During the above process, the first hydraulic motor 4 is working and the second hydraulic motor 5 is not working. At this time, the front wheel is in a vibrating state and the rear wheel is in a non-vibrating state.

[0040] 4. Rear wheel vibration and front wheel stoppage condition:

[0041] The hydraulic oil output by hydraulic pump 2 enters the P inlet port 306. When the first two-position four-way solenoid valve 302 is de-energized, the second two-position four-way solenoid valve 303 is energized. At this time, the P2 port of the second two-position four-way solenoid valve 303 is connected to the A2 port, and the T2 port is connected to the B2 port. The P1 port of the first two-position four-way solenoid valve 302 is connected to the T1 port, and the B1 port is disconnected. Hydraulic oil enters the second hydraulic motor 5 through the P inlet 306, sequentially through the P1 port, T1 port, P2 port, A2 port, and C outlet 310, thereby driving the second hydraulic motor 5 to rotate and causing the rear wheel to vibrate. Then, the hydraulic oil in the second hydraulic motor 5 enters the vibration valve group 3 through the D inlet 311. The hydraulic oil returns to the oil tank 1 through the D inlet 311, sequentially through the B2 port, T2 port, and T return port 307. During the above process, the second hydraulic motor 5 works, the first hydraulic motor 4 stops working, and at this time the rear wheel is in a vibrating state, while the front wheel is in a stopped state.

[0042] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model 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.

[0043] 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.

[0044] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are 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 with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0045] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vibration valve assembly for an open-type vibration hydraulic system of a light-duty double-drum road roller, the vibration valve assembly (3) comprising a P inlet (306), a T return port (307), an A outlet (308), a B inlet (309), a C outlet (310), and a D inlet (311), characterized in that, The vibration valve group (3) is provided with an overflow valve (301), a first two-position four-way solenoid directional valve (302), a second two-position four-way solenoid directional valve (303), a first vibration damping valve (304), and a second vibration damping valve (305). One end of the overflow valve (301) is connected to the P oil inlet (306), and the other end is connected to the T oil return port (307). The P1 port of the first two-position four-way solenoid directional valve (302) is connected to the P inlet port (306), the T1 port is connected to the P2 port of the second two-position four-way solenoid directional valve (303), the A1 port is connected to the A outlet port (308), and the B1 port is connected to the B inlet port (309). The P2 port of the second two-position four-way solenoid directional valve (303) is connected to the T1 port of the first two-position four-way solenoid directional valve (302), the T2 port is connected to the T return port (307), the A2 port is connected to the C outlet port (310), and the B2 port is connected to the D inlet port (311). One end of the first vibration-damping valve (304) is connected to the oil inlet (309) of B, and the other end is connected to the oil outlet (308) of A; The second vibration valve (305) has one end connected to the D oil inlet (311) and the other end connected to the C oil outlet (310).

2. The vibration valve assembly for the open-type vibratory hydraulic system of a light-duty double-drum road roller according to claim 1, characterized in that, The P oil inlet (306) and T oil return (307) are both connected to the oil tank (1), and a hydraulic pump (2) is provided on the pipeline connecting the P oil inlet (306) and the oil tank (1).

3. The vibration valve assembly for the open vibratory hydraulic system of a light-duty double-drum road roller according to claim 1, characterized in that, Both the A oil outlet (308) and the B oil inlet (309) are connected to the first hydraulic motor (4). The A oil outlet (308) is connected to the oil inlet of the first hydraulic motor (4), and the B oil inlet (309) is connected to the oil outlet of the first hydraulic motor (4).

4. The vibration valve assembly for the open vibratory hydraulic system of a light-duty double-drum road roller according to claim 1, characterized in that, Both the C-outlet (310) and D-inlet (311) are connected to the second hydraulic motor (5). The C-outlet (310) is connected to the inlet of the second hydraulic motor (5), and the D-inlet (311) is connected to the outlet of the second hydraulic motor (5).

5. The vibration valve assembly for the open vibratory hydraulic system of a light-duty double-drum road roller according to claim 1, characterized in that, The relief valve (301) is a direct-acting relief valve.

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