Hydraulic device of small and medium-sized material transfer device in fully mechanized mining

Abstract

The utility model discloses a kind of hydraulic devices of fully mechanized medium and small material transfer device, belong to coal mine equipment transportation technical field, specifically related to a kind of independent double-loop hydraulic system of walking and working device, the device includes high-pressure filter, flowmeter, speed regulating valve, walking tool switching valve group, tool valve group, actuator, walking proportional valve group and walking hydraulic motor etc., adopt underground emulsion as power medium, through standard mine joint quick connection pump station, again through special switching valve group realizes the physical interlock of walking and hoisting function, ensure that equipment can only start working device in stationary state, eliminate the risk of tipping caused by misoperation.Walking control adopts proportional regulating valve to drive four-wheel hydraulic motor.Compared with prior art, the device can effectively resolve high-pressure impact, solve the out-of-control problem of traditional system start-stop moment, simultaneously realize power output and brake release synchronization through hydraulic linkage mechanism, prevent car from sliding.

Description

Technical Field

[0001] This utility model belongs to the field of underground equipment transportation technology in coal mines, and particularly relates to a hydraulic device for a small-scale material transfer device in fully mechanized mining. Background Technology

[0002] In the field of trackless auxiliary transportation in underground coal mines, trackless rubber-tired vehicles are widely used for material transport due to their maneuverability and strong climbing ability. However, the current material transfer process has significant problems: after the rubber-tired vehicles transport materials underground, manual labor is still required to move the various types and large quantities of materials one by one to the designated storage point on the working face. This model results in multiple transfer links, low operational efficiency, and the need for multiple people to work together during loading and unloading, leading to extremely high labor intensity.

[0003] More prominent are the safety hazards: frequent manual hoisting, handling and stacking of heavy objects can easily lead to accidents such as being struck by objects and suffering musculoskeletal injuries; at the same time, the mixed operation of people and vehicles in narrow alleyways and working spaces increases the risk of mechanical collisions and people falling.

[0004] To address the aforementioned issues, there is an urgent need to develop a small-to-medium-sized material transfer device suitable for fully mechanized mining faces, enabling containerized transportation and mechanized loading and unloading of materials. Such devices typically include independent walking systems and working devices (such as loading and unloading mechanisms). Ensuring safe and stable equipment operation is crucial, particularly preventing misoperation. For example, if the working device (such as lifting or grabbing) is accidentally activated while the equipment is moving, it can easily lead to equipment instability and overturning, damage to the hydraulic system, or personnel crushing injuries or fatalities. Therefore, a reliable hydraulic interlock control mechanism between the walking system and the working device must be designed to fundamentally eliminate the occurrence of dangerous operating conditions. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a hydraulic device for small-scale material transfer in fully mechanized mining, specifically solving the problems through the following technical means: A hydraulic device for a small-scale material transfer apparatus in fully mechanized mining, characterized in that it includes a DN20 inlet connector, a DN25 return connector, a high-pressure filter, a flow meter, a speed control valve, a hydraulic generator set, a traveling tool switching valve assembly, a tool valve assembly, an actuator, a traveling proportional valve assembly, and a traveling hydraulic motor, wherein: the DN20 inlet connector is installed at the inlet of the oil inlet circuit; the DN25 return connector is installed at the outlet of the return circuit; the inlet of the high-pressure filter is connected to the DN20 inlet connector via a pipeline, and the outlet of the high-pressure filter is connected to the inlet of the flow meter via a pipeline; the outlet of the flow meter is split into two via a pipeline and connected to the inlet of the traveling tool switching valve assembly and the inlet of the speed control valve respectively; The outlet of the speed control valve is connected to the inlet of the hydraulic generator set via a pipeline, and the outlet of the hydraulic generator set is connected to the return oil circuit. The first outlet of the travel tooling switching valve group is connected to the inlet of two tooling valve groups via a pipeline, and the second outlet of the travel tooling switching valve group is connected to the inlet of the travel proportional valve group via a pipeline. The outlets of the tooling valve group and the travel proportional valve group are connected to the return oil circuit. The outlet of the tooling valve group is connected to the rotary motor, telescopic boom, lifting boom, left front outrigger, right front outrigger, right front telescopic outrigger, left front telescopic outrigger, left rear outrigger, right rear outrigger, left rear telescopic outrigger, and right rear telescopic outrigger in the actuator via independent pipelines. The outlet of the travel proportional valve group is connected to the travel hydraulic motor via a pipeline.

[0006] Preferably, the hydraulic generator set includes an emulsion motor, a speed increaser, and a generator, wherein: the input shaft of the speed increaser is connected to the rotating shaft of the emulsion motor, and the output shaft of the speed increaser is connected to the drive shaft of the generator; the emulsion motor drives the speed increaser and the generator in sequence under the drive of high-pressure emulsion power fluid.

[0007] Preferably, the travel proportional valve group includes an electro-proportional throttle valve, a hydraulically controlled check valve, and a shuttle valve, wherein: the high-pressure working fluid output from the travel tooling switching valve group is divided into four parts through pipelines and enters the input ports of the four electro-proportional throttle valves respectively; two electro-proportional throttle valves form a working group to drive two hydraulic motors; two hydraulically controlled check valves are connected in parallel between the output ports of the two electro-proportional throttle valves through pipelines; and a shuttle valve is connected in series between the output ports of the two electro-proportional throttle valves through pipelines; the control network composed of the four electro-proportional throttle valves, the four hydraulically controlled check valves, and the two shuttle valves realizes the independent control of four output oil circuits and two return oil circuits of the travel proportional valve group.

[0008] Preferably, the hydraulic motor for travel includes four hydraulic motors, which are controlled by a travel proportional valve group to drive the four travel wheels of the vehicle body respectively.

[0009] The hydraulic device of the small-to-medium-sized material transfer device in fully mechanized mining according to this utility model has the following beneficial effects: 1) The dual-circuit hydraulic system significantly improves the safety, efficiency, and reliability of material transfer in the fully mechanized mining face. The system adopts an architecture with independent control of the traveling and working devices, and achieves physical interlocking through a dedicated switching valve group. This ensures that the loading and unloading functions are automatically locked when the equipment is traveling, completely eliminating the risk of overturning or hydraulic shock caused by misoperation, and reducing the safety hazards of mixed personnel and vehicles working underground from the source.

[0010] 2) In terms of travel control, an electro-proportional throttle valve is used in conjunction with a progressive current curve control of the hydraulic motor. During startup, the ramp opens gradually over 3 seconds, and during shutdown, it closes gradually over 1 second, effectively mitigating the instantaneous impact on the motor under 31.5MPa high pressure. This solves the industry-wide problem of vehicle loss of control during 2-3 seconds of start-up and shutdown in traditional systems. Simultaneously, the shuttle valve synchronously delivers high-pressure oil to the travel motor brake, achieving precise linkage between power output and brake release, preventing slippage accidents during underground ramp operations.

[0011] 3) The system deeply integrates with the characteristics of mine working conditions: it directly utilizes the underground emulsion power source (5% emulsion oil + 95% water), and intercepts impurities through a 32MPa high-pressure filter and manual backwashing design to adapt to different pump station connection point working conditions; it integrates a hydraulic generator set and supplies fluid with pressure stabilization by a speed regulating valve, providing independent power for the vehicle lighting and control system, and ensuring basic functions in case of main system failure.

[0012] 4) The tooling valve group has a built-in speed control valve, which makes the lifting actuator move smoothly and reliably, supports single person to operate multiple types of materials accurately, and improves loading and unloading efficiency by more than 50%; the four-wheel independent drive combined with proportional valve control technology gives the equipment the ability to move forward, backward and turn on the spot (such as the left wheel backward and the right wheel forward to achieve left turn), which allows for flexible maneuvering in narrow working surfaces.

[0013] 5) The flow meter monitors the system status in real time, and the adjustable flow shut-off valve enables on-demand flow distribution; the entire system adopts mining standard interfaces (SAEDN20 / DN25), improving maintenance efficiency by 40%. The overall solution is based on hydraulic interlocking. Attached Figure Description

[0014] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the first hydraulic system structure of this utility model; Figure 2 This is a schematic diagram of the second hydraulic system structure of this utility model; Figure 3This is a schematic diagram of the hydraulic generator set structure of this utility model; Figure 4 This is a schematic diagram of the third hydraulic system structure of this utility model; Figure 5 This is a schematic diagram of the hydraulic system application of this utility model; Figure 6 This is a schematic diagram of the rear lifting device of this utility model.

[0016] In the diagram, 1-DN20 oil inlet connector, 2-DN25 oil return connector, 3-high pressure filter, 4-flow meter, 5-speed control valve, 6-hydraulic generator set, 601-emulsion motor, 602-speed increaser, 603-generator, 7-travel tooling switching valve group, 8-tooling valve group, 9-actuator, 901-rotary motor, 902-telescopic boom, 903-lifting boom, 904-left front outrigger, 905-right front outrigger, 906-right front telescopic outrigger, 907-left front telescopic outrigger, 908-left rear outrigger, 909-right rear outrigger, 910-left rear telescopic outrigger, 911-right rear telescopic outrigger, 10-travel proportional valve group, 101-electro-proportional throttle valve, 102-hydraulic check valve, 103-shuttle valve, 11-travel hydraulic motor. Detailed Implementation

[0017] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0018] The present invention will now be described in detail with reference to the accompanying drawings.

[0019] like Figures 1 to 6As shown, the small-scale material transfer device for fully mechanized mining faces is mainly used in underground fully mechanized mining faces for transporting large components and hoisting small materials. The whole machine consists of two parts: the main unit and the trailer. The main unit mainly consists of the chassis and the lifting arm. In this embodiment, the power source is an emulsion power system for fully mechanized mining faces, and the working medium is an emulsion (5% emulsified oil + 95% neutral soft water). The power is distributed through a hydraulic system, and then the actions of each part are executed.

[0020] In the diagram, the hydraulic system of the small-scale material transfer device in the fully mechanized mining area includes a DN20 inlet connector 1, a DN25 return connector 2, a high-pressure filter 3, a flow meter 4, a speed control valve 5, a hydraulic generator set 6, a traveling tool switching valve group 7, a tool valve group 8, an actuator 9, a traveling proportional valve group 10, and a traveling hydraulic motor 11. The DN20 inlet connector 1 is installed at the inlet of the oil inlet; the DN25 return connector 2 is installed at the outlet of the return oil inlet. Specifically, the hydraulic system uses a standard SAE internal lock DN20 mining connector for the inlet and a standard DN25 mining connector for the return, which enables the vehicle to be quickly connected to the emulsion pump station.

[0021] In the diagram, the inlet of high-pressure filter 3 is connected to DN20 oil inlet connector 1 via a pipeline, and the outlet of high-pressure filter 3 is connected to the inlet of flow meter 4 via a pipeline. Specifically, a high-pressure filter with a pressure resistance of 32 MPa and a filtration accuracy of 10 μm is connected in series in the pipeline to prevent impurities in the emulsion from entering the system and damaging hydraulic components. The filter is a manually backwashed filter. In fully mechanized mining faces, the construction locations of small and medium-sized material transfer devices are uncertain, and the locations where emulsion power is used vary, making filters very prone to clogging. Therefore, selecting a filter that is easy to clean is essential.

[0022] In the figure, the outlet of flow meter 4 is split into two by a pipeline and connected to the inlet of the traveling tool switching valve group 7 and the inlet of the speed control valve 5 respectively. Flow meter 4 can facilitate on-site construction personnel to monitor the flow rate supplied to the hydraulic system in real time.

[0023] In the diagram, the outlet of speed control valve 5 is connected to the inlet of hydraulic generator set 6 via a pipeline, and the outlet of hydraulic generator set 6 is connected to the return oil circuit. Specifically, the speed control valve provides stable pressure and flow to the hydraulic generator set, ensuring stable generator output. The generator set provides power for the lighting, control, and other functions of the small and medium-sized material handling equipment.

[0024] In the figure, the first outlet of the travel tool switching valve group 7 is connected to the oil inlet of the two tool valve groups 8 through a pipeline, and the second outlet of the travel tool switching valve group 7 is connected to the oil inlet of the travel proportional valve group 10 through a pipeline. The oil outlets of the tool valve group 8 and the travel proportional valve group 10 are connected to the return oil circuit. Specifically, considering the safety of the vehicle during operation, the operation of the travel and working devices must be independent.

[0025] In the diagram, the oil outlet of the tooling valve assembly 8 is connected via independent pipelines to the rotary motor 901, telescopic boom 902, lifting boom 903, left front outrigger 904, right front outrigger 905, right front telescopic outrigger 906, left front telescopic outrigger 907, left rear outrigger 908, right rear outrigger 909, left rear telescopic outrigger 910, and right rear telescopic outrigger 911 in the actuator 9; the oil outlet of the travel proportional valve assembly 10 is connected via a pipeline to the travel hydraulic motor 11. Specifically... Figure 5 As shown, the rotary motor 901 is rotatably mounted on the chassis, the telescopic boom 902 and the lifting boom 903 are connected in sequence, the end of the telescopic boom 902 is mounted on the rotating seat of the rotary motor 901, and the outriggers are symmetrically arranged on both sides of the chassis.

[0026] It should be noted that the tooling valve assembly controls the actuator's actions, such as cylinder extension and motor selection. Considering the need for smooth and reliable actuator operation during hoisting, stable fluid supply pressure and flow are required. Therefore, a speed control valve is integrated into the tooling valve assembly to ensure stable and reliable actuator output.

[0027] In this embodiment, the hydraulic generator set 6 includes an emulsion motor 601, a speed increaser 602, and a generator 603. In the figure, the input shaft of the speed increaser 602 is connected to the rotating shaft of the emulsion motor 601, and the output shaft of the speed increaser 602 is connected to the drive shaft of the generator 603. Under the drive of the high-pressure emulsion power fluid, the emulsion motor 601 drives the speed increaser 602 and the generator 603 to work in sequence.

[0028] In this embodiment, the travel proportional valve group 10 includes an electro-proportional throttle valve 101, a hydraulically controlled check valve 102, and a shuttle valve 103. The high-pressure working fluid output from the travel tooling switching valve group 7 is divided into four parts via pipelines and enters the input ports of the four electro-proportional throttle valves 101. Two electro-proportional throttle valves 101 form a working group to drive two hydraulic motors. Two hydraulically controlled check valves 102 are connected in parallel between the output ports of the two electro-proportional throttle valves 101 via pipelines, and a shuttle valve 103 is connected in series between the output ports of the two electro-proportional throttle valves 101 via pipelines. The control network composed of the four electro-proportional throttle valves 101, the four hydraulically controlled check valves 102, and the two shuttle valves 103 enables the independent control of four output oil circuits and two return oil circuits by the travel proportional valve group 10.

[0029] It should be noted that, considering the pressure of the underground emulsion pump station is generally maintained stably at 31.5 MPa, if the conventional travel control method is used to control the hydraulic motor, the impact of the internal piston of the motor is large at the moment of start-up and stop. This translates to a 2-3 second period of uncontrollability during vehicle start-up and stop in small and medium-sized material transfer devices. To solve this problem, this solution uses a proportional throttle valve (serial number 101) to supply fluid to the hydraulic motor. When starting small and medium-sized material transfer devices, this solution sets a ramp in the electrical control system, such as... Figure 6 The proportional valve control current curve is shown. The proportional valve fully opens 3 seconds after operation. When stopping, the control method is exactly the opposite of the starting current control curve, and the time is set to fully close in 1 second.

[0030] It should be further explained that the proportional valve assembly is functionally divided into modules for controlling the left wheel's movement and those for controlling the right wheel's movement. The control principle of the left wheel is explained below. The left wheel movement mainly consists of two electro-proportional throttle valves, two hydraulically controlled check valves, and one shuttle valve. The electro-proportional throttle valves are mainly controlled by two proportional solenoids, MRa1 and MRa2. Only one of MRa1 and MRa2 is energized during each operation. When MRa1 is energized, high pressure is output from port A1. Inside the valve body, the high-pressure oil at port A1 opens the return check valve at port B1 and supplies high-pressure oil to shuttle valve S1 to release the brake on the movement motor, as shown in the table below.

[0031] MRa1 √ Revolver forward MRa2 √ Revolver backward MRa3 √ Right wheel forward MRa4 √ Right wheel reverse In the diagram, the hydraulic motor 11 for travel includes four hydraulic motors, which are controlled by the travel proportional valve group 10 to drive the four wheels of the vehicle body respectively. It should be noted that the outlet of the travel proportional valve group controls the hydraulic motors for travel in the small and medium-sized material transfer device. The entire machine uses a four-wheel drive system. Four-wheel drive enables bidirectional travel, U-turns, and differential turning. Specifically, the small and medium-sized material transfer device in the fully mechanized mining face uses a four-wheel drive system, enabling U-turns. For a left U-turn, only MRa2 and MRa3 need to be energized simultaneously. For a right U-turn, only MRa1 and MRa4 need to be energized simultaneously.

[0032] In actual operation, this solution involves an independent dual-circuit hydraulic system for both the walking and working devices. It uses underground emulsion (5% emulsified oil + 95% water) as the power medium and is quickly connected to the pump station via standard mining connectors. The system achieves physical interlocking of walking and hoisting functions through a dedicated switching valve group, ensuring that the working device can only be started when the equipment is stationary, completely eliminating the risk of overturning caused by misoperation. The walking control uses a proportional regulating valve to drive four-wheel hydraulic motors, combined with progressive current control technology: a 3-second slow opening of the ramp during startup and a 1-second slow closing of the ramp during shutdown, effectively mitigating the 31.5MPa high-pressure impact and solving the 2-3 second loss of control problem during the start-up and shutdown of traditional systems; simultaneously, a hydraulic linkage mechanism synchronizes power output and brake release to prevent slippage. The hoisting circuit integrates a speed control valve to ensure smooth operation of the actuators and supports precise single-person operation of various materials. The system is adaptable to complex underground working conditions: the high-pressure filter is equipped with a manual backwashing function to cope with impurities; the hydraulic generator set is independently powered by a pressure stabilizing valve, ensuring redundant operation of the lighting and control systems.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A hydraulic device for a small-to-medium-sized material transfer device in fully mechanized mining, characterized in that, The components include a DN20 inlet connector (1), a DN25 return connector (2), a high-pressure filter (3), a flow meter (4), a speed control valve (5), a hydraulic generator set (6), a traveling tooling switching valve assembly (7), a tooling valve assembly (8), an actuator (9), a traveling proportional valve assembly (10), and a traveling hydraulic motor (11), wherein: The DN20 type oil inlet connector (1) is installed at the inlet of the oil inlet circuit; The DN25 type return oil connector (2) is installed at the outlet of the return oil circuit; The inlet of the high-pressure filter (3) is connected to the DN20 type oil inlet connector (1) through a pipeline, and the outlet of the high-pressure filter (3) is connected to the inlet of the flow meter (4) through a pipeline; The outlet of the flow meter (4) is connected to the inlet of the traveling tool switching valve group (7) and the inlet of the speed control valve (5) respectively through a pipeline. The outlet of the speed regulating valve (5) is connected to the inlet of the hydraulic generator set (6) through a pipeline, and the outlet of the hydraulic generator set (6) is connected to the return oil circuit. The first outlet of the traveling tool switching valve group (7) is connected to the oil inlet of two tool valve groups (8) through a pipeline, the second outlet of the traveling tool switching valve group (7) is connected to the oil inlet of the traveling proportional valve group (10) through a pipeline, and the oil outlets of the tool valve group (8) and the traveling proportional valve group (10) are connected to the return oil circuit. The oil outlet of the tooling valve group (8) is connected to the rotary motor (901), telescopic boom (902), lifting boom (903), left front outrigger (904), right front outrigger (905), right front telescopic outrigger (906), left front telescopic outrigger (907), left rear outrigger (908), right rear outrigger (909), left rear telescopic outrigger (910) and right rear telescopic outrigger (911) in the actuator (9) through independent pipelines. The oil outlet of the walking proportional valve group (10) is connected to the walking hydraulic motor (11) through a pipeline.

2. The hydraulic device for a small-scale material transfer device in fully mechanized mining according to claim 1, characterized in that, The hydraulic generator set (6) includes an emulsion motor (601), a speed increaser (602), and a generator (603), wherein: The input shaft of the speed increaser (602) is connected to the rotating shaft of the emulsion motor (601), and the output shaft of the speed increaser (602) is connected to the drive shaft of the generator (603). The emulsion motor (601) drives the speed increaser (602) and the generator (603) in sequence under the drive of the high-pressure emulsion power fluid.

3. The hydraulic device for a small-scale material transfer device in fully mechanized mining according to claim 1, characterized in that, The travel proportional valve assembly (10) includes an electro-proportional throttle valve (101), a hydraulically controlled check valve (102), and a shuttle valve (103), wherein: The high-pressure working fluid output by the traveling tool switching valve group (7) is divided into four parts through the pipeline and enters the input ports of four electro-proportional throttle valves (101). Two electro-proportional throttle valves (101) form a working group to drive two hydraulic motors. Two hydraulic control check valves (102) are connected in parallel between the output ports of the two electro-proportional throttle valves (101) through a pipeline. A shuttle valve (103) is connected in series between the output ports of the two electro-proportional throttle valves (101) through a pipeline. The four output oil circuits and two return oil circuits of the travel proportional valve group (10) are independently controlled by a control network consisting of four electro-proportional throttle valves (101), four hydraulic check valves (102) and two shuttle valves (103).

4. The hydraulic device for a small-scale material transfer device in fully mechanized mining according to claim 1, characterized in that, The walking hydraulic motor (11) includes four hydraulic motors, which are controlled by a walking proportional valve group (10) to drive the four walking wheels of the vehicle body respectively.

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