Special confluence valve for electric control lorry-mounted crane

Abstract

A special confluence valve for an electrically controlled lorry-mounted crane comprises a confluence valve, the two sides of the confluence valve are connected with two sets of working units respectively, a hydraulic control reversing valve is arranged in the confluence valve, the two sides of the hydraulic control reversing valve are connected with oil inlet paths and pilot oil paths of the two sets of working units respectively, and the hydraulic control end of the hydraulic control reversing valve is connected with a shuttle valve II. The two oil inlet ends of the shuttle valve II are connected with an electromagnetic reversing valve and a compensation valve element valve rear oil way of a set of working units respectively, oil at the input end of the electromagnetic reversing valve is provided by the shuttle valve I, and the two input ends of the shuttle valve I are connected to the oil inlet ways on the two sides of the hydraulic control reversing valve respectively. The two working units are connected through the confluence valve, under the action of the confluence valve, judgment is automatically made according to the pressure of pressure oil of the two working units, on-off of the electromagnetic valves in the confluence valve is controlled according to needs, hydraulic pumps of the two working units converge into one working unit to supply oil, a control oil way is simplified, and the working efficiency is improved. And the oil pumping risk caused by the shuttle valve is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of engineering machinery, in particular to a special confluence valve for an electrically controlled truck-mounted crane. Background Art

[0002] Truck mounted crane, also known as truck crane for short, is a kind of equipment that uses hydraulic lifting and telescopic system to achieve the lifting, rotation and hoisting of goods. It is usually installed on a truck and integrates lifting and transportation. It is widely used in equipment loading and unloading, landscaping, municipal construction and other lifting and transportation fields.

[0003] With the country's strong support for the electric vehicle industry, truck-mounted cranes have also begun to try to transform fuel vehicles into electric vehicles, and have put forward requirements for electronic, precise and intelligent control of existing proportional valves. The current mainstream large-tonnage straight-arm cranes use a pure manual reversing control proportional multi-way valve with dual pump oil supply, which is difficult to meet the requirements. A special truck-mounted crane confluence valve that is suitable for the electric vehicle chassis is needed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a special valve for merging electric-controlled truck cranes with a simple structure and good effects.

[0005] The present invention is implemented by the following technical scheme: a special valve for confluence of an electrically controlled truck-mounted crane, comprising a confluence valve, two groups of working links are connected to the two sides of the confluence valve respectively, a hydraulically controlled reversing valve is arranged inside the confluence valve, the two sides of the hydraulically controlled reversing valve are connected to the oil inlet circuits and pilot oil circuits of the two groups of working links respectively, a shuttle valve II is connected to the hydraulic control end of the hydraulically controlled reversing valve, the two oil inlet ends of the shuttle valve II are respectively connected to the electromagnetic reversing valve and the oil circuit after the compensation valve core valve of a group of working links, the oil at the input end of the electromagnetic reversing valve is provided by the shuttle valve I, the two input ends of the shuttle valve I are respectively connected to the oil inlet circuits on both sides of the hydraulically controlled reversing valve, and the output end of the shuttle valve I provides pilot hydraulic oil to the main valve of each working link through a proportional pressure reducing valve.

[0006] It is further that: the hoisting motor action link and the rotary motor action link on both sides of the said converging valve, the hoisting motor action link are also connected in sequence with the variable amplitude cylinder action link, the telescopic cylinder action link and the left inlet and return oil link, and the rotary motor action link is also connected with the right inlet and return oil link.

[0007] One oil inlet end of the shuttle valve II is connected to the oil circuit behind the compensation valve core valve of the winch motor action link.

[0008] A one-way throttle valve is arranged on the oil inlet path between the hydraulically controlled reversing valve and another group of working links.

[0009] The hydraulically controlled reversing valve is a two-position four-way hydraulically controlled reversing valve.

[0010] A throttle valve is arranged between the hydraulically controlled end of the hydraulically controlled reversing valve and the shuttle valve II, and the hydraulically controlled end of the hydraulically controlled reversing valve is also connected to an oil tank after the throttle valve.

[0011] The electromagnetic reversing valve is a two-position two-way electromagnetic reversing valve.

[0012] A pressure reducing valve is arranged between the electromagnetic reversing valve and the shuttle valve I.

[0013] The output end of the shuttle valve I provides hydraulic oil to the shuttle valve I and the proportional pressure reducing valves of each working link after passing through the pressure reducing valve.

[0014] Each working link is provided with a displacement sensor for detecting the switching stroke of the main valve core.

[0015] The present invention has the following advantages: the special merging valve for an electrically controlled truck-mounted crane of the present invention connects two groups of working joints through a merging valve, and under the action of the merging valve, a judgment is automatically made based on the size of the pressure oil pressure of the two groups of working joints, and the on-off of the solenoid valve in the merging valve is controlled as needed, so that the hydraulic pumps of the two groups of working joints merge into one group of working joint oil supply, which not only simplifies the control oil circuit and avoids the risk of oil blowby caused by the shuttle valve, but also allows the user to realize the merging function in other occasions where the merging function is required or when the automatic merging function of the winch fails, thereby providing the user with more choices. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0017] In the attached picture: Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is the hydraulic principle diagram of the present invention; Figure 3 It is a hydraulic principle diagram of the confluence valve of the present invention.

[0018] In the figure: 1, left oil return connection, 2, telescopic cylinder action connection, 3, luffing cylinder action connection, 4, winch motor action connection, 5, confluence connection, 6, rotary motor action connection, 7, right oil return connection, 8, hydraulically controlled reversing valve, 9, shuttle valve I, 10, pressure reducing valve, 11, shuttle valve II, 12, solenoid reversing valve.

[0019] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0021] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] like Figures 1 to 3The shown embodiment is a special valve for combining flow of an electrically controlled truck-mounted crane, comprising a combining valve 5, two groups of working links are connected to the two sides of the combining valve 5, a hydraulically controlled reversing valve 8 is arranged inside the combining valve 5, the two sides of the hydraulically controlled reversing valve 8 are connected to the oil inlet circuits and pilot oil circuits of the two groups of working links, the hydraulic control end of the hydraulically controlled reversing valve 8 is connected to a shuttle valve II 11, the two oil inlet ends of the shuttle valve II 11 are respectively connected to an electromagnetic reversing valve 12 and a group of working link compensation valve core valve rear oil circuits, the oil at the input end of the electromagnetic reversing valve 12 is provided by a shuttle valve I9, the two input ends of the shuttle valve I9 ​​are respectively connected to the oil inlet circuits on both sides of the hydraulically controlled reversing valve 8, and the output end of the shuttle valve I9 ​​provides pilot hydraulic oil to the main valve of each working link through a proportional pressure reducing valve. The invention discloses a special confluence valve for an electrically controlled truck-mounted crane, wherein the confluence is arranged between two groups of working links, and the dual-pump oil inlet circuit and the LS oil circuit are connected via a hydraulically controlled reversing valve in the confluence valve, and the control oil of the hydraulically controlled reversing valve is provided by a shuttle valve II, wherein the shuttle valve II is connected to the electromagnetic reversing valve and the oil circuit after the compensation valve core valve of a group of working links, and the shuttle valve II judges the oil pressure of the electromagnetic reversing valve and the oil circuit after the compensation valve core valve, and outputs hydraulic oil with a relatively large pressure to the hydraulic control end of the hydraulically controlled reversing valve, and pushes the hydraulically controlled reversing valve to reverse, thereby realizing the confluence of the two groups of working links, and the electromagnetic valve reversing valve can be manually controlled to separate and merge; in addition, the input end of the electromagnetic reversing valve is connected to the shuttle valve I, and the two sides of the input end of the shuttle valve I are connected to the dual-pump oil inlet, and the high-pressure oil at the output end passes through the pressure reducing valve to provide pressure oil for the proportional pressure reducing valve of each working link and the electromagnetic reversing valve of the confluence.

[0024] like Figure 1 to Figure 2 The shown embodiment is a special valve for merging of an electrically controlled truck-mounted crane, wherein the merging valve 5 is connected to a hoisting motor action link 4 and a slewing motor action link 6 on both sides, wherein the hoisting motor action link 4 is also connected in sequence to a boom cylinder action link 3, a telescopic cylinder action link 2 and a left oil return link 1, and the slewing motor action link 6 is also connected to a right oil return link 7. The special valve for converging electric-controlled truck-mounted crane of the present invention is a plate-type multi-way valve structure, comprising left and right oil inlet and return coupling components, four working coupling components, a converging coupling component and a connecting piece. The left and right oil inlet and return couplings are respectively connected to two pump oil inlets. The four working couplings are respectively connected to the telescopic cylinder action coupling, the luffing cylinder action coupling, the hoisting motor action coupling and the slewing motor action coupling from left to right. The converging coupling is between the hoisting motor action coupling and the slewing motor action coupling. Specifically, one end of the left oil inlet coupling is connected to the telescopic cylinder action coupling, one end of the telescopic cylinder action coupling is connected to the luffing cylinder action coupling, one end of the luffing cylinder action coupling is connected to the hoisting motor action coupling, one end of the converging coupling is connected to the slewing motor action coupling, and one end of the slewing motor action coupling is connected to the right oil inlet coupling.

[0025] like Figures 1 to 3The electric control truck crane confluence valve shown in the figure, one oil inlet end of the shuttle valve II 11 is connected to the oil path after the compensation valve core valve of the hoisting motor action link 4. The present invention. One oil inlet end of the shuttle valve II in the confluence valve of the present invention is connected to the oil path after the compensation valve core valve of the hoisting motor action link, and the automatic confluence function of the hoisting is realized through the pressure oil signal from the hoisting motor action link.

[0026] like Figure 3 The shown embodiment is a special valve for combining flow of an electrically controlled truck-mounted crane, wherein a one-way throttle valve is arranged on the oil inlet path between the hydraulically controlled reversing valve 8 and another set of working links.

[0027] like Figures 1 to 3 The hydraulically controlled reversing valve 8 is a two-position four-way hydraulically controlled reversing valve. A throttle valve is arranged between the hydraulically controlled end of the hydraulically controlled reversing valve 8 and the shuttle valve II11, and the hydraulically controlled end of the hydraulically controlled reversing valve 8 is also connected to an oil tank after the throttle valve. A hydraulically controlled reversing valve is arranged in the converging connection of the present invention, and the hydraulically controlled reversing valve is specifically a two-position four-way reversing valve. The hydraulically controlled reversing valve is used to control the connection and disconnection of the oil inlet circuit and the LS oil circuit of the dual pumps. The hydraulically controlled end of the hydraulically controlled reversing valve is provided with control oil by the shuttle valve II11, and the hydraulically controlled end of the hydraulically controlled reversing valve is also connected to the oil tank through the throttle valve to unload.

[0028] like Figures 1 to 3 The electromagnetic reversing valve 12 is a two-position two-way electromagnetic reversing valve. A pressure reducing valve 10 is arranged between the electromagnetic reversing valve 12 and the shuttle valve Ⅰ9. The electromagnetic reversing valve is arranged in the converging connection of the present invention, and the reversing oil is provided to the hydraulic control reversing valve through the electromagnetic reversing valve, wherein the electromagnetic reversing valve allows the user to manually control the on-off, and allows the user to realize the converging function in other occasions where the converging function is required or when the automatic converging function of the winch fails. The hydraulic oil output by the shuttle valve Ⅰ passes through the pressure reducing valve and is then input into the electromagnetic reversing valve for subsequent work.

[0029] like Figure 3 The electric control truck crane confluence special valve shown in the figure, the output end of the shuttle valve Ⅰ9 provides hydraulic oil to the shuttle valve Ⅰ9 and the proportional pressure reducing valves of each working link after passing through the pressure reducing valve 10. Each group of working links is provided with a displacement sensor for detecting the reversing stroke of the main valve core. Each working link of the present invention is provided with a proportional pressure reducing valve, which controls the reversing action of the main valve core. The user controls the current of the proportional pressure reducing valve through a remote controller to realize the remote control reversing function. At the same time, each working link is provided with a displacement sensor, which detects the reversing stroke of the main valve core. The detected valve core reversing displacement is calculated and converted into a flow parameter to realize the control function of the working speed of the actuator.

[0030] The principle of the special valve for converging an electric-controlled truck-mounted crane of the present invention is as follows: a hydraulically controlled reversing valve, a shuttle valve II, an electromagnetic reversing valve and a shuttle valve I are arranged in the converging connection, the hydraulically controlled reversing valve is used to control the connection and disconnection of the oil inlet circuit of the dual pump and the LS oil circuit, one side of the input end of the shuttle valve II is connected to the oil circuit after the compensation valve core valve of the hoisting motor action connection, and the other side is connected to the electromagnetic reversing valve, the pressure oil at the output end of the shuttle valve II enters the control chamber of the hydraulically controlled reversing valve, pushes the valve core of the hydraulically controlled reversing valve to realize reversing, connects the oil inlet circuit of the dual pump and the LS oil circuit respectively, and realizes the converging function; the two sides of the input end of the shuttle valve I are connected to the oil inlet of the dual pump, and the high-pressure oil at the output end is proportionally reduced pressure of each working connection through the pressure reducing valve. The solenoid reversing valve of the valve and the merging connection provides pressurized oil; specifically, when the oil inlet pressure on the side of the hoisting motor action connection is lower than the oil inlet pressure on the side of the rotary motor action connection, shuttle valve I outputs the oil inlet pressure on the rotary motor action connection to the oil inlet end of the solenoid reversing valve, and the solenoid reversing valve is opened or closed as needed. When the solenoid reversing valve is opened, the hydraulic oil output by shuttle valve I is compared with the oil pressure of the oil circuit behind the compensating spool valve of the hoisting motor action connection in shuttle valve II. The oil pressure of the hydraulic oil output by shuttle valve I is larger, and the oil is output to the hydraulic control end of the hydraulic control reversing valve to reverse the hydraulic control reversing valve, thereby realizing the merging of the two sets of working connection oil inlet pipelines.

[0031] The invention discloses a special valve for merging electric-controlled truck cranes, which uses the pressure oil signal of the automatic merging function of the winch as the oil circuit behind the compensation valve core valve of the action link, simplifies the control oil circuit, and avoids the risk of oil leakage caused by the shuttle valve; it has a manually controlled merging function, allowing the user to realize the merging function in other occasions where the merging function is required or when the automatic merging function of the winch fails; by arranging a proportional pressure reducing valve and a displacement sensor on the working link, remote operation is realized in conjunction with a remote controller, thereby improving the customer's operating experience on the basis of the original truck crane double-pump merging valve, being able to better adapt to the chassis of electric vehicles, and realizing remote control and precision control operations.

[0032] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0033] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present invention and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0034] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A special valve for confluence of an electric-controlled truck-mounted crane, characterized in that: The invention comprises a merging valve (5), wherein two groups of working links are connected to the two sides of the merging valve (5), a hydraulically controlled reversing valve (8) is arranged inside the merging valve (5), and the two sides of the hydraulically controlled reversing valve (8) are connected to the oil inlet circuits and pilot oil circuits of the two groups of working links, the hydraulic control end of the hydraulically controlled reversing valve (8) is connected to a shuttle valve II (11), and the two oil inlet ends of the shuttle valve II (11) are respectively connected to an electromagnetic reversing valve (12) and a group of compensating valve core valve rear oil circuits of the working links, the oil at the input end of the electromagnetic reversing valve (12) is provided by a shuttle valve I (9), and the two input ends of the shuttle valve I (9) are respectively connected to the oil inlet circuits on both sides of the hydraulically controlled reversing valve (8), and the output end of the shuttle valve I (9) provides pilot hydraulic oil to the main valve of each working link through a proportional pressure reducing valve.

2. The electric-controlled merging valve for truck-mounted crane according to claim 1, characterized in that: The hoisting motor action link (4) and the slewing motor action link (6) are on both sides of the merging valve (5); the hoisting motor action link (4) is also connected in sequence to the boom cylinder action link (3), the telescopic cylinder action link (2) and the left oil inlet and return link (1); and the slewing motor action link (6) is also connected to the right oil inlet and return link (7).

3. The electric-controlled merging valve for truck-mounted crane according to claim 2, characterized in that: One oil inlet end of the shuttle valve II (11) is connected to the oil path after the compensation valve core valve of the winch motor action link (4).

4. The electric-controlled truck-mounted crane confluence valve according to claim 1, characterized in that: A one-way throttle valve is provided on the oil inlet path between the hydraulically controlled reversing valve (8) and another set of working links.

5. The electric-controlled merging valve for truck-mounted crane according to claim 1, characterized in that: The hydraulically controlled reversing valve (8) is a two-position four-way hydraulically controlled reversing valve.

6. The electric-controlled truck-mounted crane confluence valve according to claim 1, characterized in that: A throttle valve is provided between the hydraulically controlled end of the hydraulically controlled reversing valve (8) and the shuttle valve II (11), and the hydraulically controlled end of the hydraulically controlled reversing valve (8) is also connected to an oil tank after the throttle valve.

7. The electric controlled merging valve for truck mounted crane according to claim 1, characterized in that: The electromagnetic reversing valve (12) is a two-position, two-way electromagnetic reversing valve.

8. The electric-controlled truck-mounted crane confluence valve according to claim 1, characterized in that: A pressure reducing valve (10) is provided between the electromagnetic reversing valve (12) and the shuttle valve I (9).

9. The electric-controlled merging valve for truck-mounted crane according to claim 8, characterized in that: The output end of the shuttle valve I (9) provides hydraulic oil to the shuttle valve I (9) and the proportional pressure reducing valves of each working link through the pressure reducing valve (10).

10. The electric-controlled truck-mounted crane confluence valve according to claim 1, characterized in that: Each group of working links is provided with a displacement sensor for detecting the switching stroke of the main valve core.

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