Steering limiting device of loading machine and two-way limiting valve of steering limiting device
The two-way limit valve design integrates the right and left push rods, solving the space occupation and complex piping problems of the loader's steering limit device, and achieving structural simplification and convenient maintenance.
Patent Information
- Application Number
- CN202422275186.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-09-18
AI Technical Summary
What is difficult to solve with existing loader technology is that the steering limit device of the existing loader occupies a large space, has complex pipeline connections, and is difficult to assemble and maintain.
A two-way limit valve design is adopted, which integrates the right and left push rods. The right and left limit members cooperate with the right and left steering cylinders respectively, reducing hydraulic pipelines, simplifying the system structure, and optimizing hydraulic control through the reset member and one-way valve.
The steering limit device of the loader has a simple structure, a simplified hydraulic system, a reduced failure rate, and improved convenience in assembly and maintenance.
Smart Images
Figure CN223370942U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of loader steering, in particular to a loader steering limit device and a two-way limit valve thereof. Background Art
[0002] A loader is a common type of engineering machinery vehicle, mainly used for shoveling and loading operations. Its steering hydraulic system usually adopts fully hydraulic articulated steering. The hydraulic components include a steering gear, a pressure reducing valve, a flow amplifying valve, a steering cylinder, etc. The steering of the front frame is achieved by controlling the extension and retraction of the steering cylinder.
[0003] When the loader is performing steering operations and reaches its limit, a steering limit device is usually set to prevent interference between the front and rear frames, protect the steering cylinder, and prevent damage to the steering cylinder.
[0004] Currently, there are two common steering limit methods: mechanical limit and hydraulic limit. Mechanical limit is mainly achieved by welding limit blocks on the left and right sides of the front and rear frames. The disadvantages are: large impact on the cylinder, poor driving comfort, and frequent collisions can easily cause deformation and affect steering performance.
[0005] Hydraulic limit (such as Figure 5 As described above, the device includes two steering limit valves, namely, a right steering limit valve 5-1 and a left steering limit valve 5-2. The right steering limit valve 5-1 and the left steering limit valve 5-2 are respectively connected to the right steering cylinder 71 and the left steering cylinder 72 through pipelines and are respectively connected to the steering gear 4 through pipelines. In some structures, a pressure reducing valve 3 and a flow amplifying valve 6 are also provided. In the existing structure, due to the provision of two left and right steering limit valves, it has the following disadvantages: the installation space occupied by the whole vehicle is large, there are more pipeline connections and control harnesses, the system is more complicated, and the assembly and subsequent maintenance are relatively difficult. Utility Model Content
[0006] The utility model provides a steering limit device for a loader and a bidirectional limit valve thereof, which can solve the problems pointed out in the background technology.
[0007] A steering limit device for a loader includes a hydraulic oil tank, a gear pump, a steering gear, a steering limit valve, and right and left steering cylinders. The steering limit valve is a two-way limit valve, which includes a right push rod and a left push rod. The right push rod and the left push rod are respectively arranged corresponding to the right limit member and the left limit member to achieve respective matching limits. The two interface ends of the steering gear are respectively connected to the two interface ends of the two-way limit valve, and the two-way limit valve is respectively connected to the right steering cylinder and the left steering cylinder.
[0008] Preferably, the right limit member and the left limit member are both "triangle" limit frames, which are respectively connected to the two sides of the front frame, and the two-way limit valve is connected to the axis of the rear frame and is arranged correspondingly thereto.
[0009] Preferably, the right return member and the left return member are both return springs.
[0010] Preferably, it also includes a pressure reducing valve and a flow amplifying valve, the pressure reducing valve is connected to the gear pump, the steering gear and the hydraulic oil tank respectively, and the flow amplifying valve is connected to the two-way limit valve and the left steering cylinder and the right steering cylinder respectively.
[0011] A two-way limit valve, the two-way limit valve includes a valve body, a reversing valve core, a right pipeline group and a left pipeline group, the left and right sides of the reversing valve core are respectively connected to the left push rod and the right push rod, the right push rod and the left push rod are reset by a right reset member and a left reset member respectively, the right pipeline group includes a first right branch pipe passing through the reversing valve core and a second right branch pipe arranged in parallel with the first right branch pipe, the two ends of the first right branch pipe are respectively connected to the right steering cylinder and the right interface of the two-way limit valve, the left pipeline group includes a first left branch pipe passing through the reversing valve core and a second left branch pipe arranged in parallel with the first left branch pipe, the two ends of the first left branch pipe are respectively connected to the left steering cylinder and the left interface of the two-way limit valve, the second right branch pipe and the second left branch pipe are respectively provided with a right one-way valve and a left one-way valve.
[0012] Beneficial effects: The utility model provides a steering limit device for a loader and a two-way limit valve thereof. The limit device has the advantages of a simple structure, few hydraulic pipelines, a simple hydraulic system, simple assembly and subsequent maintenance, and a low failure rate. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic diagram of the hydraulic principle of Example 1 of the utility model.
[0014] Figure 2 This is a schematic diagram of the principle of the two-way limit valve of the utility model.
[0015] Figure 3 This is a schematic diagram of the structure of the utility model.
[0016] Figure 4 This is a schematic diagram of the hydraulic principle of Example 2 of the present utility model.
[0017] Figure 5 This is a schematic diagram of the existing structure.
[0018] Description of reference numerals:
[0019] Reference numerals in the figure: hydraulic oil tank 1; gear pump 2; pressure reducing valve 3; steering gear 4; two-way limit valve 5; right push rod 51; left push rod 52; valve body 53; reversing valve core 54; right reset member 55; left reset member 56; first right branch pipe 571; second right branch pipe 572; first left branch pipe 581; second left branch pipe 582; right one-way valve 59; left one-way valve 60; flow amplifying valve 6; right steering cylinder 71; left steering cylinder 72; right limit member 81; left limit member 82; front frame 9; rear frame 10; right steering limit valve 5-1; left steering limit valve 5-2. DETAILED DESCRIPTION
[0020] A specific embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.
[0021] Example 1:
[0022] like Figure 1-3 As shown, a steering limit device for a loader includes a hydraulic oil tank 1, a gear pump 2, a steering gear 4, a steering limit valve, and a right steering cylinder 71 and a left steering cylinder 72. The steering limit valve is a two-way limit valve 5, which includes a right push rod 51 and a left push rod 52. The right push rod 51 and the left push rod 52 are respectively arranged corresponding to the right limit piece 81 and the left limit piece 82 to achieve respective matching limits. The two interface ends of the steering gear 4 are respectively connected to the two interface ends of the two-way limit valve 5, and the two-way limit valve 5 is respectively connected to the right steering cylinder 71 and the left steering cylinder 72.
[0023] Specifically, refer to Figure 3 As shown, the right limit member 81 and the left limit member 82 are both "triangle" limit frames, which are respectively connected to the two sides of the front frame 9, and the two-way limit valve 5 is connected to the axis of the rear frame 10 and is correspondingly arranged thereto.
[0024] Specific, with particular reference Figure 2As shown, the technical solution adopted by the present application also proposes a two-way limit valve, the two-way limit valve 5 includes a valve body 53, a reversing valve core 54, a right pipeline group and a left pipeline group, the left and right sides of the reversing valve core 54 are respectively connected to the left push rod 52 and the right push rod 51, the right push rod 51 and the left push rod 52 are respectively reset by the right reset member 55 and the left reset member 56, the right reset member 55 and the left reset member 56 can both be reset springs, the right pipeline group includes a first right branch pipe 571 passing through the reversing valve core 54 and the first right branch pipe 57 1 is connected in parallel with the second right branch pipe 572. The two ends of the first right branch pipe 571 are respectively connected to the right steering cylinder 71 and the right interface of the two-way limit valve 5. The left pipeline group includes a first left branch pipe 581 passing through the reversing valve core 54 and a second left branch pipe 582 connected in parallel with the first left branch pipe 581. The two ends of the first left branch pipe 581 are respectively connected to the left steering cylinder 72 and the left interface of the two-way limit valve 5. The second right branch pipe 572 and the second left branch pipe 582 are respectively connected to the right check valve 59 and the left check valve 60. For specific connection methods, refer to Figure 1-2 The basic structural form and principle of this structure are basically the same as those of the right turn limit valve 5-1 and the left turn limit valve 5-2 in the existing structure, except that the left and right limits are simultaneously realized in one valve body 53, that is, the limit coordination in the left and right directions is realized. Through such an integrated design, the pipeline connection can be reduced, the system can be simplified, and the assembly and subsequent maintenance can be simplified.
[0025] Example 2:
[0026] On the basis of Example 1, especially combined with Figure 4 As shown, in order to meet the needs of large-tonnage loaders, a pressure reducing valve 3 and a flow amplifying valve 6 are added. This structural form is also available in the existing structure to meet the needs of large-tonnage loaders. The pressure reducing valve 3 is connected to the gear pump 2, the steering gear 4 and the hydraulic oil tank 1, and the flow amplifying valve 6 is connected to the two-way limit valve 5 and the left steering cylinder 72 and the right steering cylinder 71. The specific connection relationship can be referred to Figure 4 .
[0027] The working principle of this utility model is particularly referred to Figure 3-4As shown, when the loader turns right, the steering wheel is turned clockwise, and the pressure oil enters the oil inlet of the steering gear 4 through the pressure reducing valve 3. Then, as the steering wheel turns, the hydraulic oil first enters the b1 port of the two-way limit valve 5 through the R port of the steering gear 4, and then enters the b port of the pilot oil port of the flow amplification valve 6 through the b2 port of the steering limit valve. This pushes the reversing valve core of the flow amplification valve 6 to move, allowing the oil from the gear pump 2 to enter the rodless chamber of the left steering cylinder 72 and the rod chamber of the right steering cylinder 71, thereby achieving the right turn of the loader. When the loader turns to the limit position, the right push rod 51 at the right end of the two-way limit valve 5 flexibly contacts the right limit member 81, pushing the reversing valve core 54 of the two-way limit valve 5 from the left to the right position, cutting off the oil circuit between the R port of the steering gear 5 and the pilot b port of the flow amplification valve 6, causing the main oil circuit of the flow amplification valve 6 to drain oil, and steering stops. The impact of high-pressure oil on the steering cylinder is effectively avoided during the steering limit process.
[0028] The above disclosures are only a few specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.
Claims
1. A steering limit device for a loader, characterized by: The invention comprises a hydraulic oil tank (1), a gear pump (2), a steering gear (4), a steering limit valve, a right steering oil cylinder (71) and a left steering oil cylinder (72), and is characterized in that: the steering limit valve is a two-way limit valve (5), which comprises a right push rod (51) and a left push rod (52), the right push rod (51) and the left push rod (52) are respectively arranged corresponding to the right limit member (81) and the left limit member (82) to achieve respective matching limit, the two interface ends of the steering gear (4) are respectively connected to the two interface ends of the two-way limit valve (5), and the two-way limit valve (5) is respectively connected to the right steering oil cylinder (71) and the left steering oil cylinder (72).
2. A loader steering limiter according to claim 1, characterized in that: The right limit member (81) and the left limit member (82) are both "triangular" limit frames, which are respectively connected to the two sides of the front frame (9). The two-way limit valve (5) is connected to the axis of the rear frame (10) and is correspondingly arranged thereto.
3. A loader steering limiter according to any one of claims 1-2, characterized in that: It also includes a pressure reducing valve (3) and a flow amplifying valve (6), wherein the pressure reducing valve (3) is respectively connected to the gear pump (2), the steering gear (4) and the hydraulic oil tank (1), and the flow amplifying valve (6) is respectively connected to the two-way limit valve (5) and the left steering cylinder (72) and the right steering cylinder (71).
4. A two-way limit valve, characterized in that: The two-way limit valve (5) comprises a valve body (53), a reversing valve core (54), a right pipeline group and a left pipeline group. The left and right sides of the reversing valve core (54) are respectively connected to a left push rod (52) and a right push rod (51). The right push rod (51) and the left push rod (52) are reset by a right reset member (55) and a left reset member (56) respectively. The right pipeline group comprises a first right branch pipe (571) passing through the reversing valve core (54) and a second right branch pipe (572) arranged in parallel with the first right branch pipe (571). The first right branch pipe ( The two ends of the left branch pipe (571) are respectively connected to the right steering cylinder (71) and the right interface of the two-way limit valve (5); the left pipeline group includes a first left branch pipe (581) passing through the reversing valve core (54) and a second left branch pipe (582) arranged in parallel with the first left branch pipe (581); the two ends of the first left branch pipe (581) are respectively connected to the left steering cylinder (72) and the left interface of the two-way limit valve (5); the second right branch pipe (572) and the second left branch pipe (582) are respectively provided with a right one-way valve (59) and a left one-way valve (60).
5. A two-way limit valve according to claim 4, characterized in that: The right return member (55) and the left return member (56) are both return springs.