Hydraulic elevator system and electric drive mining dump truck

Abstract

The utility model discloses a hydraulic elevator system and an electric drive mining dump truck. The hydraulic elevator system comprises an oil tank, a variable pump, a filter, an elevator valve, a swing cylinder and a ball valve, wherein the elevator valve is formed by integrating a one-way speed regulating valve, a speed regulating valve, a hydraulic control one-way valve, an electromagnetic directional valve and a pressure reducing valve; the one-way speed regulating valve is formed by integrating a one-way valve and a speed regulating valve; the swing cylinder is hydraulically controlled to rotate so as to drive the box step to stably ascend and descend, the influence of too high ground clearance of a vehicle is avoided, and personnel can conveniently get on and off the vehicle; when a power source is lost, the ball valve is opened to realize stable descending of the vehicle ladder under the emergency condition, so that the safety of a driver is improved; the two-way speed control of ascending and descending of the vehicle ladder is realized through the serial speed regulating valve and the one-way speed regulating valve, so that the vehicle ladder stably ascends and descends; by reasonably designing the integral type integrated elevator valve, connection and leakage points of pipelines are reduced, and needed functions are achieved at the same time.

Description

Technical Field

[0001] The utility model relates to a hydraulic lift system of an electric transmission mining dump truck, belonging to the field of mining machinery. Background Art

[0002] Electric mining dump trucks offer high efficiency and low operating costs in transporting minerals, earth, and other materials, making them widely used in large open-pit mines and earthwork construction sites. They consist of an engine, generator, frame, cab, hydraulic system, deck, and ladder. The ladder is a crucial component, requiring drivers to access the vehicle. Electric mining dump trucks are typically large, with ample ground clearance, resulting in a high height below the ground, necessitating a ladder to access the cab. Electric mining dump trucks typically utilize a mechanical ladder that requires manual raising and lowering. Summary of the Invention

[0003] The utility model aims to provide a hydraulic lift system applied to an electric drive mining dump truck, with the purpose of realizing hydraulic lifting and lowering of the vehicle ladder through the solution.

[0004] The utility model is implemented according to the following technical solutions:

[0005] In a first aspect, the present invention provides a hydraulic lift system, comprising:

[0006] Oil tank, used to store hydraulic oil;

[0007] A variable displacement pump, connected to the oil tank, serves as an oil source for the hydraulic system and outputs hydraulic oil to the outside;

[0008] The swing cylinder is connected to the car ladder and is used to rotate and drive the car ladder to rise and fall;

[0009] The elevator valve is connected between the variable pump and the swing cylinder, and the elevator valve includes an electromagnetic reversing valve, a pressure reducing valve, a hydraulically controlled one-way valve, a one-way speed regulating valve and a speed regulating valve; the electromagnetic reversing valve is connected to the lifting button, and changes the hydraulic oil circuit entering the swing cylinder by controlling the electromagnetic reversing valve; the pressure reducing valve is connected to the variable pump and the electromagnetic reversing valve, and is used to control the pressure of the hydraulic elevator system; the hydraulically controlled one-way valve is connected to the electromagnetic reversing valve, and is used to control the flow and the maintenance of the car ladder; the one-way speed regulating valve is connected to the swing cylinder, and is used to control the flow and the speed of the lowering car ladder; the speed regulating valve is connected in series between the hydraulically controlled one-way valve and the one-way speed regulating valve, and is used to control the speed of raising the car ladder.

[0010] In some embodiments, the speed regulating valve and the one-way speed regulating valve are connected to one end of a ball valve through a pipeline, and the other end of the ball valve is connected to the return oil pipeline of the hydraulic elevator system. After opening the ball valve, the elevator can be lowered by its own weight.

[0011] In some embodiments, the one-way speed regulating valve consists of a one-way valve and a speed regulating valve.

[0012] In some embodiments, a filter is connected in series in the hydraulic oil circuit between the elevator valve and the variable displacement pump.

[0013] In some embodiments, the lifting button includes a raising button and a lowering button; when the raising button is pressed, the left electromagnet of the electromagnetic reversing valve is energized in the left position, and the swinging hydraulic cylinder drives the vehicle ladder to rise; when the lowering button is pressed, the right electromagnet of the electromagnetic reversing valve is energized in the right position, and the swinging hydraulic cylinder drives the vehicle ladder to descend.

[0014] In some embodiments, it also includes a position detection component, which is electrically connected to the input end of the vehicle-mounted controller, and the output end of the vehicle-mounted controller is electrically connected to the electromagnetic reversing valve; when the vehicle ladder is lifted to the position detection component, the controller receives the in-position signal sent by the position detection component and controls the electromagnetic reversing valve to be in the middle position without power, and the hydraulic control port of the hydraulic control one-way valve is closed without pressure oil.

[0015] In some embodiments, the position detection component is a proximity switch.

[0016] In a second aspect, the utility model provides an electric drive mining dump truck, comprising a vehicle ladder, wherein the vehicle ladder is raised and lowered by the above-mentioned hydraulic lift system.

[0017] Beneficial effects of the utility model:

[0018] The hydraulically controlled swing cylinder rotates to drive the vehicle ladder to rise and fall smoothly, avoiding the impact of excessive ground clearance of the vehicle and making it convenient for people to get on and off the vehicle;

[0019] When the power source is lost, the ball valve can be opened to realize the steady descent of the ladder under its own weight in an emergency, thus improving the safety of the driver.

[0020] By connecting the speed regulating valve and the one-way speed regulating valve in series, the two-way speed control of the car ladder is realized, and the car ladder can be raised and lowered smoothly;

[0021] By rationally designing the integral integrated elevator valve, the connections and leakage points of the pipelines are reduced while achieving the required functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are part of this utility model and are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be derived from these drawings without inventive effort.

[0023] In the attached figure:

[0024] Figure 1 This is a schematic diagram of the hydraulic lift system of the present utility model.

[0025] Illustrations: 1. Oil tank, 2. Variable pump, 3. Filter, 4. One-way speed control valve, 5. One-way valve, 6. Speed ​​control valve, 7. Elevator valve, 8. Swing cylinder, 9. Ball valve, 10. Speed ​​control valve, 11. Hydraulic-controlled one-way valve, 12. Solenoid reversing valve, 13. Pressure reducing valve.

[0026] 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 rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0027] 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.

[0028] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0029] like Figure 1The figure shows a hydraulic elevator system, including an oil tank 1, a variable pump 2, a filter 3, an elevator valve 7, a swing cylinder 8, and a ball valve 9. The elevator valve 7 is composed of a one-way speed regulating valve 4, a speed regulating valve 10, a hydraulically controlled one-way valve 11, a solenoid reversing valve 12, and a pressure reducing valve 13. The one-way speed regulating valve 4 is composed of a one-way valve 5 and a speed regulating valve 6. The variable pump 2 serves as the hydraulic elevator system's oil source, and the solenoid reversing valve 12 controls the various operating conditions of the hydraulic elevator system by reversing the flow. Pressurized oil flows through the filter 3 to the elevator valve 7, which is connected to the swing cylinder 8, the ball valve 9, and the oil tank 1. The swing cylinder 8 is connected to the one-way speed regulating valve 4 and the solenoid reversing valve 12, rotating to raise and lower the vehicle elevator. Opening the ball valve 9 allows the vehicle elevator to lower under its own weight. The pressure reducing valve 13 is connected to the filter 3 and the solenoid reversing valve 12 to control the pressure in the hydraulic elevator system. The hydraulically controlled check valve 11 connects the electromagnetic reversing valve 12 and the speed regulating valve 10 to control flow and maintain the vehicle ladder. The speed regulating valve 10 connects the hydraulically controlled check valve 11 and the one-way speed regulating valve 4 to control the speed of raising the vehicle ladder. The one-way speed regulating valve 4 connects the speed regulating valve 10 and the swing cylinder 8 to control flow and the speed of lowering the vehicle ladder.

[0030] For further solutions, please refer to Figure 1 As shown, the electromagnetic reversing valve 12 is connected to the lifting button, and the lifting button includes a lifting button and a lowering button; when the lifting button is pressed, the left electromagnet of the electromagnetic reversing valve 12 is energized and is in the left position, and the variable pump 2 outputs hydraulic oil through the filter 3 and the pressure reducing valve 13 to the left position of the electromagnetic reversing valve 12, and then through the hydraulically controlled one-way valve 11, the speed regulating valve 10, and the one-way valve 5 to the swing cylinder 8 to drive the car ladder to rise; when the lowering button is pressed, the right electromagnet of the electromagnetic reversing valve 12 is energized and is in the right position, and the variable pump 2 outputs hydraulic oil through the filter 3 and the pressure reducing valve 13 to the right position of the electromagnetic reversing valve 12, and to the swing cylinder 8 to drive the car ladder to fall, and the hydraulic oil then passes through the speed regulating valve 6, the speed regulating valve 10, the hydraulically controlled one-way valve 11, and the electromagnetic reversing valve 12 back to the oil tank 1.

[0031] For further solutions, please refer to Figure 1 As shown, it also includes a position detection component, which is electrically connected to the input end of the vehicle-mounted controller, and the output end of the vehicle-mounted controller is electrically connected to the electromagnetic reversing valve 12; when the vehicle ladder is lifted to the position detection component, the controller receives the in-position signal sent by the position detection component and controls the electromagnetic reversing valve 12 to be in the middle position without power, and the variable pump 2 outputs hydraulic oil through the filter 3 and the pressure reducing valve 13 to the middle position of the electromagnetic reversing valve 12 and is cut off, the hydraulic control port of the hydraulic control one-way valve 11 is closed without pressure oil, and the hydraulic pressure drops and the return oil to the hydraulic control one-way valve 11 is cut off to realize the holding function.

[0032] The working process of the above hydraulic lift system is given below:

[0033] Continue to refer to Figure 1As shown, when the electric transmission mining dump truck needs to raise the vehicle ladder: press the raising button, the left electromagnet of the electromagnetic reversing valve 12 is energized and is in the left position; by adjusting the pressure reducing valve 13, the pressure is set to the pressure value just for raising the vehicle ladder. If someone accidentally stands on the vehicle ladder when raising the vehicle ladder, the vehicle ladder will not move; the vehicle ladder is controlled to rise at an appropriate speed by adjusting the speed regulating valve 10; the hydraulic oil output by the variable pump 2 passes through the filter 3 and the pressure reducing valve 13 to the left position of the electromagnetic reversing valve 12; the hydraulic oil output from the left position of the electromagnetic reversing valve 12 passes through the hydraulic control one-way valve 11, the speed regulating valve 10, and the one-way valve 5 to the swing cylinder 8; the swing cylinder 8 drives the vehicle ladder to rise smoothly, and the return oil returns directly to the oil tank 1 through the electromagnetic reversing valve 12.

[0034] Continue to refer to Figure 1 As shown, when the electric drive mining dump truck needs to lower the vehicle ladder: press the descending button, the right electromagnet of the electromagnetic reversing valve 12 is energized and is in the right position; by adjusting the speed control valve 6 to be smaller than the opening of the speed control valve 10, only the speed control valve 6 of the series speed control valve 6 and the speed control valve 10 plays a role, and the speed control valve 6 is adjusted to control the vehicle ladder to descend at an appropriate speed; the hydraulic oil output by the variable pump 2 passes through the filter 3 and the pressure reducing valve 13 to the right position of the electromagnetic reversing valve 12; the hydraulic oil output from the right position of the electromagnetic reversing valve 12 reaches the hydraulically controlled one-way valve 11 and the swing cylinder 8, and the hydraulically controlled reversing valve 11 is opened; the swing cylinder 8 drives the vehicle ladder to descend smoothly, and the return oil returns to the oil tank 1 through the speed control valve 6, the speed control valve 10, the hydraulically controlled one-way valve 11, and the electromagnetic reversing valve 12.

[0035] Continue to refer to Figure 1 As shown, when the electric drive mining dump truck ladder is raised to the specified position: the proximity switch detects and sends an in-position signal to the on-board controller, and the on-board controller controls the electromagnetic reversing valve 12 to be in the middle position without power; the hydraulic oil output by the variable pump 2 passes through the filter 3 and the pressure reducing valve 13 to the middle position of the electromagnetic reversing valve 12 and is cut off; the hydraulic control port of the hydraulic control one-way valve 11 has no pressure oil and is closed, and the swing cylinder 8 descends and the return oil passes through the speed regulating valve 6 and the speed regulating valve 10 to the hydraulic control one-way valve 11 and is cut off to realize the holding function.

[0036] Continue to refer to Figure 1 As shown, when the electric drive mining dump truck loses its power source, the ball valve 9 is opened, the vehicle ladder drives the swing cylinder 8 to descend, and the return oil returns to the oil tank 1 through the speed regulating valve 6 and the ball valve 9, so that the vehicle ladder can descend steadily under its own weight in an emergency.

[0037] In summary, the utility model provides a hydraulic lift system, which drives the vehicle ladder to rise and fall smoothly by hydraulically controlling the rotation of the swing cylinder, avoiding the influence of excessive ground clearance of the vehicle and making it convenient for people to get on and off the vehicle; when the power source is lost, the ball valve can be opened to achieve the emergency vehicle ladder's own weight and steady descent, thereby improving the safety of the driver; by connecting a speed control valve and a one-way speed control valve in series, two-way speed control of the vehicle ladder's raising and lowering is achieved, and the vehicle ladder rises and falls smoothly; by rationally designing an integral integrated lift valve, the connection and leakage points of the pipeline are reduced while achieving the required functions.

[0038] The electric drive mining dump truck provided by the present invention is described below. The electric drive mining dump truck described below and the hydraulic lift system described above can be referred to in correspondence with each other.

[0039] The utility model provides an electric drive mining dump truck, which may include the hydraulic lift system as described in any one of the above embodiments.

[0040] The beneficial effects achieved by the electric drive mining dump truck provided by the present invention are consistent with the beneficial effects achieved by the hydraulic lift system provided by the present invention, and will not be described in detail here.

[0041] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may 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.

[0042] Furthermore, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are also intended to fall within the scope of protection of the present invention and form different embodiments. For example, in the above embodiments, those skilled in the art will be able to use them in combination based on the known technical solutions and the technical problems to be solved by this application.

[0043] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments using the above-mentioned technical content without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A hydraulic elevator system, characterized in that: include: Oil tank, used to store hydraulic oil; A variable displacement pump connected to the oil tank serves as an oil source for the hydraulic system and outputs hydraulic oil to the outside; The swing cylinder is connected to the car ladder and is used to rotate and drive the car ladder to rise and fall; An elevator valve is connected between the variable displacement pump and the swing cylinder, and the elevator valve includes: The electromagnetic reversing valve is connected to the lifting button, and the hydraulic oil circuit entering the swing cylinder is changed by controlling the electromagnetic reversing valve; a pressure reducing valve connected to the variable pump and the electromagnetic reversing valve, for controlling the pressure of the hydraulic elevator system; A hydraulically controlled one-way valve, connected to the electromagnetic reversing valve, for controlling flow and vehicle ladder maintenance; A one-way speed regulating valve is connected to the swing cylinder and is used to control the flow and the speed of the descending vehicle ladder; The speed regulating valve is connected in series between the hydraulically controlled one-way valve and the one-way speed regulating valve, and is used to control the speed of raising the vehicle ladder.

2. A hydraulic elevator system according to claim 1, characterized in that: The speed regulating valve and the one-way speed regulating valve are connected to one end of a ball valve through a pipeline. The other end of the ball valve is connected to the return oil pipeline of the hydraulic lift system. After opening the ball valve, the lift can be lowered by its own weight.

3. The hydraulic elevator system according to claim 1, characterized in that: The one-way speed regulating valve consists of a one-way valve and a speed regulating valve.

4. The hydraulic elevator system according to claim 1, characterized in that: A filter is connected in series in the hydraulic oil circuit between the elevator valve and the variable displacement pump.

5. The hydraulic elevator system according to claim 1, characterized in that: The lifting button includes a raising button and a lowering button; when the raising button is pressed, the left electromagnet of the electromagnetic reversing valve is energized in the left position, and the swing hydraulic cylinder drives the vehicle ladder to rise; when the lowering button is pressed, the right electromagnet of the electromagnetic reversing valve is energized in the right position, and the swing hydraulic cylinder drives the vehicle ladder to fall.

6. The hydraulic elevator system according to claim 1, characterized in that: It also includes a position detection component, which is electrically connected to the input end of the vehicle-mounted controller, and the output end of the vehicle-mounted controller is electrically connected to the electromagnetic reversing valve; when the vehicle ladder is lifted to the position detection component, the controller receives the in-position signal sent by the position detection component and controls the electromagnetic reversing valve to be in the middle position without power, and the hydraulic control port of the hydraulic control one-way valve is closed without pressure oil.

7. The hydraulic elevator system according to claim 6, characterized in that: The position detection component adopts a proximity switch.

8. An electric drive mining dump truck, including a vehicle ladder, characterized in that: The vehicle elevator is raised and lowered by the hydraulic elevator system according to any one of claims 1 to 7.

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