Hydraulic system suitable for underground large-tonnage carry-scraper

Abstract

The utility model discloses a hydraulic system applicable to an underground large-tonnage carry-scraper, which belongs to the technical field of hydraulic systems of carry-scrapers and comprises a hydraulic oil tank, a hydraulic control system and a hydraulic control system. The first oil way unit is used for controlling a bucket of the carry-scraper to lift and tip over; the second oil way unit is used for controlling the carry-scraper to steer; and the first oil way unit and the second oil way unit are respectively communicated with the hydraulic oil tank to form an oil supply loop. According to the utility model, steering is separated from lifting and tipping, and steering is preferentially carried out, so that the safety of the carry-scraper in the underground operation process is favorably improved, and the problem of action execution lag caused by oil intermingling in a hydraulic system can be effectively solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of hydraulic systems for earthmoving machines, and specifically relates to a hydraulic system suitable for large-tonnage earthmoving machines in underground mines. Background Technology

[0002] Existing loaders typically use a single main valve to control steering, bucket lifting, and tilting. However, due to oil leakage and insufficient oil pressure, the loaders often experience delays in executing these actions.

[0003] When a heavy-duty loader brakes, it generates a lot of heat. If it is not cooled down in time, it can easily damage the front and rear axles of the loader. Utility Model Content

[0004] The purpose of this utility model is to provide a hydraulic system suitable for large-tonnage underground loaders, aiming to solve the problems existing in the prior art mentioned above.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A hydraulic system suitable for large-tonnage underground loaders, including

[0007] Hydraulic oil tank, used to supply oil to the hydraulic system;

[0008] The first hydraulic circuit unit is used to control the lifting and tilting of the loader's bucket;

[0009] The second hydraulic circuit unit is used to control the steering of the loader;

[0010] The first and second oil circuit units are respectively connected to the hydraulic oil tank to form an oil supply circuit.

[0011] Furthermore, the first oil circuit unit includes a first oil pump, a first valve block, a main valve, and a first return valve block connected in sequence. The main valve is connected to the tilting cylinder and the lifting cylinder of the loader, respectively. The main valve is used to drive the loader to perform tilting and lifting actions, respectively. The first valve block is an integrated overflow valve used to control the pressure of the first oil circuit unit.

[0012] Furthermore, the second oil circuit unit includes a second oil pump, a steering valve, a steering safety valve, and a steering cylinder connected in sequence. The outlet of the steering valve is connected to the first return valve block. The steering cylinder includes a left steering cylinder and a right steering cylinder. The steering valve is used to control the left steering cylinder and the right steering cylinder. The steering safety valve is used for oil circuit pressure limiting and stabilization.

[0013] Furthermore, the hydraulic oil tank is connected to a first diverter valve, which is connected to a first oil pump and a second oil pump respectively. The second oil pump, the first valve block, and the steering valve are connected in sequence. The first valve block is used to control the pressure of the second oil circuit unit.

[0014] Furthermore, it also includes a third oil circuit unit for controlling the parking of the loader.

[0015] Furthermore, the third oil circuit unit includes a third oil pump, a filling valve, a second diverter valve block, an accumulator, a third directional valve, a shuttle valve, a foot brake valve, and a second return valve block; the third oil pump, the filling valve, and the second diverter valve block are connected in sequence, the first outlet of the second diverter valve block is connected to the accumulator, the accumulator is used for pressure maintenance and replenishment, and the second outlet of the second diverter valve block is connected to the third directional valve; the third directional valve, the shuttle valve, and the foot brake valve are connected in sequence, and the foot brake valve is used to control the braking cylinders of the front and rear axles of the loader.

[0016] Furthermore, the first outlet of the foot brake valve is connected to the brake cylinders of the front axle and the rear axle respectively, and the second outlet of the foot brake valve is connected to the second return valve block. The outlet of the brake cylinder is provided with a valve plate, which is opened by hydraulic pressure to connect the brake cylinder and the second return valve block. When the valve plate is closed, the brake cylinder is disconnected from the second return valve block, and the brake cylinder brakes the front axle and the rear axle of the loader respectively.

[0017] Furthermore, it also includes a fourth hydraulic circuit unit for cooling the front and rear axles of the loader.

[0018] Furthermore, the fourth oil circuit unit includes a first oil branch circuit, which includes a fourth oil pump, a one-way valve, a hydraulic motor for the radiator, and a second return valve connected in sequence. The first oil branch circuit is used to drive the radiator to operate. It also includes a second oil branch circuit, which is used by the radiator to cool the oil in the second oil branch circuit. The second oil branch circuit is connected to the brake cylinders of the front axle and the rear axle.

[0019] Furthermore, the second oil distribution circuit includes a cooling safety valve, a radiator, and a diversion valve assembly connected in sequence. The second outlet of the filling valve is connected to the cooling safety valve. The diversion valve assembly is used to guide oil into the brake cylinders of the front axle and the rear axle to cool the front axle and the rear axle.

[0020] The present invention has the following beneficial effects.

[0021] 1. This utility model separates the steering of the loader from the lifting and tilting of the bucket. The lifting and tilting of the bucket are controlled by the main valve, and the steering valve and steering safety valve are used to control the steering of the loader. This solves the problem of delayed action execution caused by oil leakage in the hydraulic system. Steering takes priority, which helps to improve the safety of the loader during underground operations. The first valve block is used to regulate the oil pressure in the first oil circuit unit and the second oil circuit unit respectively to ensure stable oil pressure.

[0022] 2. The hydraulic system is equipped with a third oil circuit unit, which controls the shovel's braking. The braking adopts the reverse braking principle. When the shovel is not braking, the brake cylinders of the front axle and the rear axle are connected to the second return valve block. When the shovel brakes, the brake cylinders of the front axle and the rear axle are disconnected from the second return valve, and the brake cylinders start braking.

[0023] 3. The hydraulic system is equipped with a fourth oil circuit unit, which is used to cool the front and rear axles of the loader to prevent damage to the axles from the heat generated by braking. The first branch oil circuit drives the radiator to operate, and the radiator is used to cool the oil in the second branch oil circuit. The cooled oil flows into the brake cylinders of the front and rear axles, and the oil and fluid mix and cool down to achieve rapid cooling of the front and rear axles. Attached Figure Description

[0024] Figure 1 This is a hydraulic system control diagram of this utility model.

[0025] In the diagram: 100, hydraulic cylinder; 201, first diverter valve; 202, first oil pump; 203, first valve block; 204, main valve; 205, tilting cylinder; 206, first diverter valve block; 207, lifting cylinder; 208, first return valve block; 301, second oil pump; 302, third steering valve; 303, steering safety valve; 304, steering cylinder; 401, second diverter valve; 402, third oil pump; 403 404. Oil filter; 405. Filling valve; 406. Second diverter valve block; 407. Accumulator; 408. Second directional valve; 409. Shuttle valve; 410. Foot brake valve; 411. Second return valve block; 412. Front axle; 413. Rear axle; 504. Fourth oil pump; 505. Check valve; 506. Oil filter; 507. Hydraulic motor; 518. Cooling safety valve; 519. Radiator; 510. Diverter valve assembly. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] Reference Figure 1This utility model discloses a hydraulic system suitable for underground large-tonnage loaders, which is used to control the operation of underground large-tonnage loaders.

[0028] The hydraulic system includes a hydraulic oil tank 100 and a first oil circuit unit installed on the loader. The hydraulic oil tank 100 stores hydraulic oil, and the first oil circuit unit is connected to the hydraulic oil tank 100 through an oil supply pipe, which is used by the loader to perform lifting and tilting actions of the bucket.

[0029] The first oil circuit unit includes a first oil pump 202, a first valve block 203, a main valve 204 and a first return valve block 208 connected in sequence through an oil supply pipe. The first oil pump 202 is connected to the hydraulic oil tank 100, and the first return valve block 208 is connected to the hydraulic oil tank 100.

[0030] The main valve 204 is connected to the lifting cylinder 207 and the tilting cylinder 205 respectively. Specifically, the main valve 204 has a first liquid supply port, a first liquid return port, a second liquid supply port and a second liquid return port, wherein the first liquid supply port is connected to the liquid inlet of the tilting cylinder 205 and the first liquid return port is connected to the liquid outlet of the tilting cylinder 205.

[0031] A first diversion valve block 206 is provided between the main valve 204 and the lifting cylinder 207. The loader has two sets of lifting cylinders 207. The first diversion valve block 206 is connected to the two sets of lifting cylinders 207 respectively. The first diversion valve block 206 is used to divert hydraulic oil to the lifting cylinders 207 in equal amounts. The second supply port of the main valve 204 is connected to the inlet port of the first diversion valve block 206, and the second return port is connected to the outlet port of the first diversion valve block 206.

[0032] The main valve 204 is equipped with a first reversing valve and a second reversing valve. The first reversing valve is used to control the start and stop of the tilting cylinder 205; the second reversing valve is used to control the start and stop of the lifting cylinder 207.

[0033] The first valve block 203 is an integrated relief valve. The relief valve is connected to the first return valve block 208 through the oil supply pipe and is used to control the pressure of the first oil circuit unit, playing the role of overflow pressure stabilization.

[0034] The above settings enable the first oil pump 202 to drive the oil flow through the first valve block 203 into the main valve 204, and the main valve 204 controls the bucket of the loader to perform a tilting action through the first reversing valve; the main valve 204 controls the bucket of the loader to perform a lifting action through the second reversing valve.

[0035] In one embodiment, the hydraulic system further includes a second oil circuit unit, which is connected to the hydraulic oil tank 100 via an oil supply pipe and is used for the loader to perform steering actions.

[0036] The second oil circuit unit includes a second oil pump 301, a steering valve 302, a steering safety valve 303, and a steering cylinder 304. The second oil pump 301, the first valve block 203, and the steering valve 302 are connected in sequence, and the outlet of the steering valve 302 is connected to the first return oil valve block 208.

[0037] The hydraulic oil tank 100 is connected to a first diverter valve 201. The first diverter valve 201 has a first outlet and a second outlet. The first outlet is connected to the first oil pump 202, and the second outlet is connected to the second oil pump 301.

[0038] Steering cylinder 304 includes a left steering cylinder and a right steering cylinder. Steering valve 302 is connected to steering safety valve 303, which is also connected to both the left and right steering cylinders. Steering valve 302 controls the start and stop of steering cylinder 304 and also controls the flow direction of hydraulic fluid, thereby controlling the loader to complete steering. Steering safety valve 303 is a stacked double relief valve used for hydraulic pressure limiting and stabilization, preventing overpressure damage to components and contributing to stable steering performance.

[0039] The hydraulic oil tank is connected to a first diverter valve 201. The first diverter valve 201 has a first outlet and a second outlet. The first outlet is connected to the first oil pump 202, and the second outlet is connected to the second oil pump 301.

[0040] The above settings enable the second oil pump 301 to drive the oil flow through the steering valve 302, which in turn controls the left and right steering cylinders, allowing the loader to perform steering actions. The steering safety valve 303 helps ensure stable oil pressure.

[0041] In one embodiment, the hydraulic system further includes a third oil circuit unit, which is connected to the hydraulic oil tank 100 via an oil supply pipe and is used for the loader to perform braking actions.

[0042] The third oil circuit unit includes a third oil pump 402, an oil filter 403, a filling valve 404, a second diverter valve block 405, an accumulator 406, a third directional valve 407, a shuttle valve 408, a foot brake valve 409, and a second return valve block 410. The third oil pump 402, oil filter 403, filling valve 404, and second diverter valve block 405 are connected in sequence. The oil filter 403 is used to filter oil impurities, the filling valve 404 is used for rapid oil replenishment or discharge, the first outlet of the second diverter valve block 405 is connected to the accumulator 406, which is used for pressure maintenance and replenishment, and the second outlet of the second diverter valve block 405 is connected to the third directional valve 407. The third directional valve 407, shuttle valve 408, and foot brake valve 409 are connected in sequence. The third directional valve 407 is used to control the on / off state of the third oil circuit unit; the shuttle valve 408 is used to ensure that the pressure of the front axle 411 and the rear axle 412 is consistent; the foot brake valve 409 is used to control the braking of the shovel loader; the second return valve 410 is connected to the hydraulic oil tank 100.

[0043] The foot brake valve 409 has a first outlet and a second outlet. The first outlet is connected to the brake cylinders of the front axle 411 and the rear axle 412, respectively, and the second outlet is connected to the second return valve block 410. When the foot brake valve 409 is not activated, the first outlet remains connected to the brake cylinders of the front axle 411 and the rear axle 412, and the second outlet is closed. When the foot brake valve 409 is activated (i.e., when braking), the first outlet is closed, and the second outlet is connected to the second return valve 410.

[0044] Both the front axle 411 and the rear axle 412 of the loader are equipped with brake cylinders. The outlet of the brake cylinder has a valve plate, which is a one-way valve plate and requires a certain pressure to open. When the valve plate is open, the brake cylinder is connected to the second return valve 410, and the loader is in an unbraked state; when the valve plate is closed, the brake cylinder is disconnected from the second return valve 410, and the loader is in a braked state.

[0045] The above settings can achieve the following:

[0046] When the third directional valve 407 cuts off the third oil circuit unit, the loader is in manual parking mode.

[0047] When the third directional valve 407 is connected to the third oil circuit and the foot brake valve 409 is not activated, the third oil pump 402 delivers oil to the filling valve 404 for rapid filling. The oil is then delivered to the accumulator 406 for energy storage through the second diverter valve block 405. After the oil flows through the third directional valve 407, shuttle valve 408 and foot brake valve 409 in sequence, the oil enters the brake cylinders of the front axle 411 and the rear axle 412. Under pressure, the valve plates are pushed open, and the oil flows back to the hydraulic oil tank 100 through the second return valve 410.

[0048] When the third directional valve 407 is connected to the third oil circuit unit and the foot brake valve 409 is in the open state (i.e., the braking state), the first outlet of the foot brake valve 409 is closed and the second outlet is open. The oil flows into the second return valve 410 through the second outlet. At the same time, since there is no continuous oil flow, the valve plates inside the brake cylinders of the front axle 411 and the rear axle 412 are closed, and the brake cylinders brake the front axle 411 and the rear axle 412, thus braking the loader.

[0049] In one embodiment, the hydraulic system further includes a fourth oil circuit unit, which is connected to the hydraulic oil tank 100 via an oil supply pipe and is used for cooling the front axle 411 and the rear axle 412, reducing the risk of damage to the front and rear axles due to increased temperature caused by braking.

[0050] The fourth oil circuit unit includes a first oil circuit and a second oil circuit. The first oil circuit is used to drive the radiator 512, and the second oil circuit is used to cool the front axle 411 and the rear axle 412.

[0051] The first oil circuit includes a fourth oil pump 501, a one-way valve 502, a second oil filter 503, a hydraulic motor 504 for a radiator 512, and a second return valve 410, which are connected in sequence.

[0052] The second oil distribution circuit includes a filling valve 404, a cooling safety valve 511, a radiator 512, and a flow divider valve group 513 connected in sequence. The second outlet of the filling valve 404 is connected to the cooling safety valve 511. The flow divider valve group 513 is connected to the brake cylinders of the front axle 411 and the rear axle 412 respectively. Between the cooling safety valve 511 and the flow divider valve group 513, the oil in the second oil distribution circuit flows through the radiator 512, which physically cools the oil (the hydraulic motor 504 of the radiator 512 drives the cooling blades to rotate, thus cooling the oil flowing through the radiator). The oil in the second oil distribution circuit flows into the brake cylinders of the front axle 411 and the rear axle 412 respectively, and mixes with the oil in the brake cylinders, thereby achieving the purpose of cooling the front axle 411 and the rear axle 412.

[0053] The hydraulic oil tank 100 is connected to a second liquid distribution valve 401. The first outlet of the second liquid distribution valve 401 is connected to the third oil pump 402, and the second outlet of the second liquid distribution valve 401 is connected to the fourth oil pump 501.

[0054] The above settings can achieve the following:

[0055] The hydraulic motor 504, driven by the fourth oil pump 501, flows sequentially through the check valve 502, the second oil filter 503, and the drive radiator 512. After the hydraulic motor 504 is running, it returns to the hydraulic oil tank 100 through the second return oil valve 410. The second oil filter filters the oil, which helps to ensure the normal operation of the hydraulic motor 504.

[0056] The oil flows sequentially through the cooling safety valve 511, radiator 512, and flow divider valve group 513 along the second outlet of the filling valve 404. After the radiator cools the oil, it flows into the brake cylinders of the front axle 411 and the rear axle 412. The oil mixes with the oil in the brake cylinder, thereby cooling the front axle 411 and the rear axle 412.

[0057] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic system suitable for large-tonnage underground loaders, characterized in that, include A hydraulic oil tank is connected to a first diverter valve, which is connected to a first oil pump and a second oil pump respectively. The second oil pump, a first valve block and a steering valve are connected in sequence. The first valve block is used to control the pressure of the second oil circuit unit. The first hydraulic circuit unit includes a first oil pump, a first valve block, a main valve, and a first return valve block connected in sequence. The main valve is connected to the tilting cylinder and the lifting cylinder of the loader respectively. The main valve is used to drive the loader to perform tilting and lifting actions respectively. The first valve block is an integrated overflow valve used to control the pressure of the first hydraulic circuit unit. The second oil circuit unit includes a second oil pump, a steering valve, a steering safety valve, and a steering cylinder connected in sequence. The outlet of the steering valve is connected to the first return valve block. The steering cylinder includes a left steering cylinder and a right steering cylinder. The steering valve is used to control the left steering cylinder and the right steering cylinder. The steering safety valve is used for oil circuit pressure limiting and stabilization. The first and second oil circuit units are respectively connected to the hydraulic oil tank to form an oil supply circuit.

2. The hydraulic system as described in claim 1, characterized in that, It also includes a third hydraulic circuit unit, which comprises a third oil pump, a filling valve, a second diverter valve block, an accumulator, a third directional valve, a shuttle valve, a foot brake valve, and a second return valve block. The third oil pump, the filling valve, and the second diverter valve block are connected in sequence. The first outlet of the second diverter valve block is connected to the accumulator, which is used for pressure maintenance and replenishment. The second outlet of the second diverter valve block is connected to the third directional valve. The third directional valve, the shuttle valve, and the foot brake valve are connected in sequence. The foot brake valve is used to control the braking cylinders of the front and rear axles of the loader.

3. The hydraulic system as described in claim 2, characterized in that, The first outlet of the foot brake valve is connected to the brake cylinders of the front axle and the rear axle respectively, and the second outlet of the foot brake valve is connected to the second return valve block. The outlet of the brake cylinder is provided with a valve plate. The valve plate is opened by hydraulic pressure to connect the brake cylinder and the second return valve block. When the valve plate is closed, the brake cylinder is disconnected from the second return valve block, and the brake cylinder brakes the front axle and the rear axle of the loader respectively.

4. The hydraulic system as described in claim 3, characterized in that, It also includes a fourth oil circuit unit, which includes a first oil branch circuit. The first oil branch circuit includes a fourth oil pump, a one-way valve, a hydraulic motor for the radiator, and a second return oil valve connected in sequence. The first oil branch circuit is used to drive the radiator to operate. It also includes a second oil branch circuit. The radiator is used to cool the oil in the second oil branch circuit. The second oil branch circuit is connected to the brake cylinders of the front axle and the rear axle.

5. The hydraulic system as described in claim 4, characterized in that, The second oil distribution circuit includes a cooling safety valve, a radiator, and a diversion valve assembly connected in sequence. The second outlet of the filling valve is connected to the cooling safety valve. The diversion valve assembly is used to introduce oil into the brake cylinders of the front axle and the rear axle to cool the front axle and the rear axle.

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