Double-function single-linkage foot valve hydraulic control system and engineering equipment

Abstract

The utility model provides a double-function single-linkage foot valve hydraulic control system and engineering equipment. The hydraulic control system comprises a single-linkage foot valve, a switching electromagnetic valve connected with the single-linkage foot valve, a multi-linkage pump, a multi-way valve connected with an oil outlet of the multi-linkage pump, a first execution oil cylinder and a second execution oil cylinder. The multi-way valve comprises a first working valve unit and a second working valve unit, and the switching electromagnetic valve is provided with a first working position and a second working position; when the switching electromagnetic valve is located at a first working position, pilot control oil enters the first working valve link from the single-link foot valve, and a high-pressure oil port of the first working valve link is communicated with the first execution oil cylinder to execute a first function; when the switching electromagnetic valve is located at a second working position, the pilot control oil enters a second working valve link from the single-link foot valve, and a high-pressure oil port of the second working valve link is communicated with a second execution oil cylinder to execute a second function; according to the utility model, one single-linkage foot valve can control the working valve linkage of the two main valves.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic construction machinery, in particular to a hydraulic control system of a dual-function single-stage foot valve and an engineering equipment. Background Art

[0002] Miniature excavators need to adapt to different construction sites and working conditions, and there are more and more requirements for the multi-function of excavators. The whole vehicle pilot control device includes a left hand pilot handle (responsible for boom and swing operations), a right hand pilot handle (responsible for arm and bucket operations), a bulldozing operation pilot handle (responsible for bulldozing blade operations), a left single-stage foot valve (responsible for breaker operations), a right single-stage foot valve (responsible for arm deflection operations), and a travel double-stage foot valve (responsible for left and right travel operations).

[0003] At present, the traditional single-stage foot valve of pilot control can only control a single main valve bank. If new functions of the whole machine need to be added, a new main valve function bank needs to be added to provide the corresponding working oil source at this time, and a new pilot control valve also needs to be added to provide the action control of this valve bank; due to the limited number of hydraulic control operation valves of the whole vehicle, there is no other operable position in the existing driver's cab to install a new single-stage foot valve.

[0004] Therefore, there is an urgent need for a hydraulic control system of a dual-function single-stage foot valve and an engineering equipment, which can meet the requirement that a single-stage foot valve can control two main valve working banks. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a hydraulic control system of a dual-function single-stage foot valve and an engineering equipment, aiming at solving the technical problem that the traditional single-stage foot valve of pilot control can only control a single main valve bank.

[0006] To achieve the above purpose, in the first aspect, the utility model provides a hydraulic control system of a dual-function single-stage foot valve, including: a single-stage foot valve, a switching solenoid valve connected to the single-stage foot valve, a multi-stage pump, a multi-way valve connected to the oil outlet of the multi-stage pump, and a first actuator cylinder and a second actuator cylinder;

[0007] The multi-way valve includes a first working valve bank and a second working valve bank, and the switching solenoid valve has a first working position and a second working position;

[0008] When the switching solenoid valve is in the first working position, the pilot control oil enters the first working valve bank from the single-stage foot valve, and the high-pressure oil port of the first working valve bank is communicated with the first actuator cylinder to execute the first function;

[0009] When the switching solenoid valve is in the second working position, the pilot control oil enters the second working valve assembly from the single-link foot valve, and the high-pressure oil port of the second working valve assembly communicates with the second actuator cylinder to perform the second function.

[0010] As a further improvement of the above solution, the hydraulic control system of the dual-function single-link foot valve further includes a switch, which is electrically connected to the electromagnetic coil of the switching solenoid valve for controlling the energization and de-energization of the electromagnetic coil; preferably, the switch is a rocker switch.

[0011] As a further improvement of the above solution, the switching solenoid valve is a two-position six-way electromagnetic directional valve;

[0012] If the electromagnetic coil of the switching solenoid valve is de-energized, the switching solenoid valve is in the first working position;

[0013] If the electromagnetic coil of the switching solenoid valve is energized, the switching solenoid valve is in the second working position.

[0014] As a further improvement of the above solution, the valve body of the switching solenoid valve is provided with a first working oil port, a second working oil port, a third working oil port, a fourth working oil port, a fifth working oil port and a sixth working oil port;

[0015] The first working oil port and the second working oil port are respectively connected to the left pedal oil port and the right pedal oil port of the single-link foot valve;

[0016] When the switching solenoid valve is in the first working position, the first working oil port and the fourth working oil port are communicated, and the second working oil port and the sixth working oil port are communicated,

[0017] The fourth working oil port is connected to the first pilot oil port of the first working valve assembly, and the sixth working oil port is connected to the second pilot oil port of the first working valve assembly;

[0018] When the switching solenoid valve is in the second working position, the first working oil port and the third working oil port are communicated, and the second working oil port and the fifth working oil port are communicated,

[0019] The third working oil port is connected to the third pilot oil port of the second working valve assembly, and the fifth working oil port is connected to the fourth pilot oil port of the second working valve assembly.

[0020] As a further improvement of the above solution, both the first working valve assembly and the second working valve assembly are pilot-operated hydraulically controlled three-position eight-way valves.

[0021] In a second aspect, the present invention further provides an engineering equipment, including the hydraulic control system of the dual-function single-link foot valve provided in the first aspect.

[0022] Since the present utility model adopts the above technical solutions, the beneficial effects of the present application are as follows:

[0023] The present utility model provides a hydraulic control system for a dual-functional single-stage foot valve, comprising: a single-stage foot valve, a switching solenoid valve connected to the single-stage foot valve, a multi-stage pump, a multi-way valve connected to the oil outlet of the multi-stage pump, and a first actuator cylinder and a second actuator cylinder; the multi-way valve includes a first working valve bank and a second working valve bank, and the switching solenoid valve has a first working position and a second working position; when the switching solenoid valve is in the first working position, the pilot control oil enters the first working valve bank from the single-stage foot valve, and the high-pressure oil port of the first working valve bank communicates with the first actuator cylinder to perform a first function; when the switching solenoid valve is in the second working position, the pilot control oil enters the second working valve bank from the single-stage foot valve, and the high-pressure oil port of the second working valve bank communicates with the second actuator cylinder to perform a second function; in the present utility model, by providing a switching solenoid valve connected to the single-stage foot valve, a new dual-functional single-stage foot valve is formed. When the first actuator cylinder needs to perform the first function, only need to switch the switching solenoid valve to the corresponding first working position, the pilot control oil enters the first working valve bank from the single-stage foot valve, and the corresponding passage of the first working valve bank is conducted, so that the high-pressure oil coming out of the multi-stage pump enters the first actuator cylinder through the corresponding passage and performs the first function; similarly, when the second actuator cylinder needs to perform the second function, only need to switch the switching solenoid valve to the corresponding second working position, the pilot control oil enters the second working valve bank from the single-stage foot valve, and the corresponding passage of the second working valve bank is conducted, so that the high-pressure oil coming out of the multi-stage pump enters the second actuator cylinder through the corresponding passage and performs the second function. Such a setting realizes the purpose of controlling two functional valve banks with a single-stage foot valve, without the need to correspondingly provide a single-stage foot valve for each main valve bank as in the traditional way, thereby realizing the purpose of controlling the work of two main valve working valve banks with a single-stage foot valve in a limited driver's cab, and the structure is simple and the operation is convenient. Description of the Drawings

[0024] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0025] Figure 1 It is a schematic diagram of the principle of a hydraulic control system for a dual-functional single-stage foot valve disclosed by the present utility model.

[0026] Reference numerals:

[0027] 1. Single - stage foot valve; 2. Switching solenoid valve; 3. Multi - stage pump; 4. Multi - way valve; 41. First working valve connection; 42. Second working valve connection; 5. First actuator cylinder; 6. Second actuator cylinder; 7. Switch;

[0028] a. First working oil port; b. Second working oil port; c. Third working oil port; d. Fourth working oil port; e. Fifth working oil port; f. Sixth working oil port; pb1. First pilot oil port; pa1. Second pilot oil port; pb2. Third pilot oil port; pa2. Fourth pilot oil port.

[0029] The realization, functional features and advantages of the present utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0031] It should be noted that all directional indications (such as up, down...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, the directional indications will also change accordingly.

[0032] In addition, the descriptions such as "first" and "second" in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0033] Moreover, the technical solutions between the various embodiments of the present utility model can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0034] Embodiment 1

[0035] See Figure 1, the present utility model provides a hydraulic control system for a dual-function single-stage foot valve 1, comprising: a single-stage foot valve 1, a switching solenoid valve 2 connected to the single-stage foot valve 1, a multi-stage pump 3, a multi-way valve 4 connected to the oil outlet of the multi-stage pump 3, and a first actuator cylinder 5 and a second actuator cylinder 6;

[0036] The multi-way valve 4 includes a first working valve section 41 and a second working valve section 42, and the switching solenoid valve 2 has a first working position and a second working position;

[0037] When the switching solenoid valve 2 is in the first working position, the pilot control oil enters the first working valve section 41 from the single-stage foot valve 1, and the high-pressure oil port of the first working valve section 41 communicates with the first actuator cylinder 5 to perform the first function;

[0038] When the switching solenoid valve 2 is in the second working position, the pilot control oil enters the second working valve section 42 from the single-stage foot valve 1, and the high-pressure oil port of the second working valve section 42 communicates with the second actuator cylinder 6 to perform the second function;

[0039] In the present utility model, by providing a switching solenoid valve 2 connected to the single-stage foot valve 1, a new dual-function single-stage foot valve 1 is formed. When the first actuator cylinder 5 needs to perform the first function, only need to switch the switching solenoid valve 2 to the corresponding first working position, the pilot control oil enters the first working valve section 41 from the single-stage foot valve 1, and the corresponding passage of the first working valve section 41 is conducted, so that the high-pressure oil coming out of the multi-stage pump 3 enters the first actuator cylinder 5 through the corresponding passage and performs the first function; similarly, when the second actuator cylinder 6 needs to perform the second function, only need to switch the switching solenoid valve 2 to the corresponding second working position, the pilot control oil enters the second working valve section 42 from the single-stage foot valve 1, and the corresponding passage of the second working valve section 42 is conducted, so that the high-pressure oil coming out of the multi-stage pump 3 enters the second actuator cylinder 6 through the corresponding passage and performs the second function. Such a setting realizes the purpose of controlling two function valve sections with a single-stage foot valve 1, without the need to correspondingly set a single-stage foot valve 1 for each main valve section as in the traditional way, thus achieving the purpose of controlling the work of two main valve working valve sections with a single-stage foot valve 1 in a limited driver's cab, and the structure is simple and the operation is convenient.

[0040] As a preferred embodiment, the hydraulic control system of the dual-functional single-link foot valve 1 further includes a switch 7, which is electrically connected to the electromagnetic coil of the switching solenoid valve 2 for controlling the energization and de-energization of the electromagnetic coil; preferably, the switch 7 is a rocker switch 7 with a rated voltage of 12V. By controlling the on / off of the rocker switch 7, the energization and de-energization of the electromagnetic coil are controlled, so as to conveniently control the switching solenoid valve 2 to switch to the corresponding working position, thereby realizing the control of two working valve units in the multi-way valve 4.

[0041] As a preferred embodiment, the switching solenoid valve 2 is a two-position six-way electromagnetic reversing valve;

[0042] If the electromagnetic coil of the switching solenoid valve 2 is de-energized, the switching solenoid valve 2 is in the first working position;

[0043] If the electromagnetic coil of the switching solenoid valve 2 is energized, the switching solenoid valve 2 is in the second working position; the valve body of the switching solenoid valve 2 is provided with a first working oil port a, a second working oil port b, a third working oil port c, a fourth working oil port d, a fifth working oil port e and a sixth working oil port f;

[0044] The first working oil port a and the second working oil port b are respectively connected to the left pedal oil port and the right pedal oil port of the single-link foot valve 1 correspondingly;

[0045] When the switching solenoid valve 2 is in the first working position, the first working oil port a is communicated with the fourth working oil port d, and the second working oil port b is communicated with the sixth working oil port f;

[0046] The fourth working oil port d is connected to the first pilot oil port pb1 of the first working valve unit 41, and the sixth working oil port f is connected to the second pilot oil port pa1 of the first working valve unit 41;

[0047] When the switching solenoid valve 2 is in the second working position, the first working oil port a is communicated with the third working oil port c, and the second working oil port b is communicated with the fifth working oil port e;

[0048] The third working oil port c is connected to the third pilot oil port pb2 of the second working valve unit 42, and the fifth working oil port e is connected to the fourth pilot oil port pa2 of the second working valve unit 42;

[0049] With such a setting, only by controlling the energization or de-energization of the electromagnetic coil corresponding to the two-position flow-through electromagnetic reversing valve, the high-pressure oil in the main oil circuit of the multi-way valve 4 can be distributed to the first actuator cylinder 5 to perform the first functional action or distributed to the second actuator cylinder 6 to perform the second functional action.

[0050] As a preferred embodiment, both the first working valve connection 41 and the second working valve connection 42 are pilot-operated hydraulically controlled three-position eight-way valves.

[0051] Embodiment 2

[0052] The present utility model further provides an engineering equipment, including the hydraulic control system of a dual-functional single-link foot valve 1 provided in Embodiment 1; in this embodiment, an excavator is taken as an example for illustration. The first actuator cylinder 5 is a deflection working cylinder, the second actuator cylinder 6 is a bulldozer blade cylinder, and the main pump is a four-link main pump, providing a high-pressure oil source for the actions of the deflection working cylinder and the bulldozer blade cylinder.

[0053] The multi-way valve 4 controls the pressure, flow rate, and action direction of the high-pressure oil distributed to the first actuator cylinder 5 or the second actuator cylinder 6. Specifically, by controlling the energization and de-energization of the switching solenoid valve 2, the pilot control oil enters the corresponding working valve connection of the multi-way valve 4 from the single-link foot valve 1, so as to distribute the high-pressure oil to the deflection working cylinder or the bulldozer blade cylinder, thereby realizing that a single-link foot valve 1 can control two main valve working valve connections to perform different corresponding functions.

[0054] Specifically, in this embodiment, when the rocker switch 7 is in the non-energized state, the electromagnetic coil of the switching solenoid valve 2 is de-energized. When the pedal of the single-link foot valve 1 is pressed left or right, its pilot control oil enters the first working valve connection 41 of the multi-way valve 4 from the fourth working oil port d and the sixth working oil port f of the single-link foot valve 1. At the same time, the high-pressure oil at the A1 / B1 oil port of the first working valve connection 41 of the multi-way valve 4 is connected to the rodless cavity / rod cavity of the deflection working cylinder, realizing the left deflection / right deflection action of the upper working device.

[0055] When the rocker switch 7 is in the energized state, the electromagnetic coil of the switching control valve is energized. When the pedal of the single-link foot valve 1 is pressed left or right, its pilot control oil enters the second working valve connection 42 of the multi-way valve 4 from the third working oil port c and the fifth working oil port e of the single-link foot valve 1. At the same time, the high-pressure oil at the A2 / B2 oil port of the second working valve connection 42 of the multi-way valve 4 is connected to the rodless cavity / rod cavity of the bulldozer cylinder, realizing the lifting and lowering actions of the bulldozer blade of the lower frame; thus realizing the action commutation of a single-link foot valve 1 of a hydraulic excavator to control the operation of the bulldozer blade and the deflection of the two main valves.

[0056] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. All equivalent structural transformations made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present utility model.

Claims

1. A dual-function single-pedal valve hydraulic control system, characterized in that: include: A single foot valve, a switching solenoid valve connected to the single foot valve, a multiple pump, a multi-way valve connected to the oil outlet of the multiple pump, and a first actuating cylinder and a second actuating cylinder; The multi-way valve comprises a first working valve link and a second working valve link, and the switching solenoid valve has a first working position and a second working position; When the switching solenoid valve is in the first working position, the pilot control oil enters the first working valve link from the single-link foot valve, and the high-pressure oil port of the first working valve link is connected to the first actuator cylinder to perform the first function; When the switching solenoid valve is in the second working position, the pilot control oil enters the second working valve link from the single-link foot valve, and the high-pressure oil port of the second working valve link is connected to the second actuator cylinder to perform the second function.

2. A dual-function single-pedal valve hydraulic control system according to claim 1, characterized in that: The dual-function single-unit foot valve hydraulic control system also includes a switch, which is electrically connected to the electromagnetic coil of the switching electromagnetic valve and is used to control the gain and loss of power to the electromagnetic coil.

3. A dual-function single-pedal valve hydraulic control system according to claim 1 or 2, characterized in that: The switching solenoid valve is a two-position six-way solenoid reversing valve; if the solenoid coil of the switching solenoid valve loses power, the switching solenoid valve is in the first working position; If the electromagnetic coil of the switching electromagnetic valve is energized, the switching electromagnetic valve is in the second working position.

4. A dual-function single-pedal valve hydraulic control system according to claim 1 or 2, characterized in that: The valve body of the switching solenoid valve is provided with a first working oil port, a second working oil port, a third working oil port, a fourth working oil port, a fifth working oil port and a sixth working oil port; The first working oil port and the second working oil port are respectively connected to the left pedal oil port and the right pedal oil port of the single-joint foot valve; When the switching solenoid valve is in the first working position, the first working oil port is connected to the fourth working oil port, and the second working oil port is connected to the sixth working oil port. The fourth working oil port is connected to the first pilot oil port of the first working valve link, and the sixth working oil port is connected to the second pilot oil port of the first working valve link; When the switching solenoid valve is in the second working position, the first working oil port is connected to the third working oil port, and the second working oil port is connected to the fifth working oil port. The third working oil port is connected to the third pilot oil port of the second working valve link, and the fifth working oil port is connected to the fourth pilot oil port of the second working valve link.

5. A dual-function single-pedal valve hydraulic control system according to claim 1 or 2, characterized in that: The first working valve coupler and the second working valve coupler are both pilot-operated hydraulically controlled three-position eight-way valves.

6. An engineering equipment, characterized in that: It comprises a dual-function single-coupled foot valve hydraulic control system as described in any one of claims 1-5.

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