A parking brake hydraulic control system and method for a diamond arm excavator

Abstract

A kind of parking brake hydraulic control system and method special for diamond arm excavator, including main pump, walking reversing valve, walking motor and drive wheel;Drive wheel side is equipped with locking pin and brake cylinder B;Walking motor side is equipped with friction disc assembly and brake cylinder A;It further includes pilot pump, solenoid valve, high-pressure hydraulic control valve, shuttle valve, check valve, low-pressure hydraulic control valve;The control end of high-pressure hydraulic control valve is connected together with shuttle valve, the control end of low-pressure hydraulic control valve is connected together with solenoid valve.The system of the application adopts high-low pressure "cross" control, realizes the multiple selection of excavator parking brake mode, two parking modes, independent operation, do not interfere with each other;When parking, drive wheel is locked with frame as a whole, greatly reduces the impact of diamond arm excavator on walking reduction gear when working, improves the service life and reliability of walking reduction gear;Using the original walking pipeline configuration of excavator, while increasing the function, do not increase the pipeline, reduce the use cost.

Description

A hydraulic control system and method for parking brake of boom excavator Technical Field

[0001] This invention relates to the field of hydraulic control technology, specifically a hydraulic control system and method for parking brakes of boom excavators. Background Technology

[0002] The boom excavator is a variant of the excavator, generally a large excavator equipped with a new working device (boom). It uses a heavy-duty composite boom with a single hook-shaped tooth to lift hard rocks, break up hardened rocks, and create an integrated working face, thus creating a better working environment for subsequent earthwork stripping and improving the efficiency of subsequent equipment construction.

[0003] This equipment operates in harsh environments with extremely heavy workloads. When lifting hard rocks using hook-shaped teeth, the rocks exert a significant reverse pulling force on the excavator through the hook teeth. At this point, the travel motor's parking brake locks, preventing the motor from rotating. The motor is directly connected to the reducer, and the reducer's drive teeth mesh with the tracks, locking the tracks to the machine. The reverse pulling force is ultimately offset by the friction between the tracks and the ground, bringing the excavator to a complete stop and maximizing its lifting force. In this transmission chain, the travel reducer bears the greatest torque. The frequent operation of the hook teeth continuously impacts the travel reducer, making it highly susceptible to damage and resulting in a short service life. This reduces the excavator's reliability and economic efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a low-cost and effective hydraulic control system and method for parking brakes of boom excavators.

[0005] The present invention is achieved by the following technical solution: a hydraulic control system for parking brake of a boom excavator, including a main pump, the main pump being connected to a travel motor via a travel reversing valve, the output end of the travel motor being connected to a drive wheel via a travel reducer; a locking pin is provided on one side of the drive wheel, the locking pin being connected to a brake cylinder B; a friction disc assembly is also provided on one side of the output end of the travel motor, and a brake cylinder A is provided on one side of the friction disc assembly.

[0006] It also includes a pilot pump, which is connected to a solenoid valve, which is connected to a high-pressure hydraulic control valve, which is connected to brake cylinder B; the two input ends of the travel motor are equipped with shuttle valves, which are connected to brake cylinder A through check valves, and brake cylinder A is also connected to a low-pressure hydraulic control valve through throttle valve II;

[0007] The control terminal of the high-pressure hydraulic control valve is connected to the output terminal of the shuttle valve, and the control terminal of the low-pressure hydraulic control valve is connected to the solenoid valve.

[0008] Furthermore, the output end of the main pump is connected to the hydraulic oil tank via an overflow valve.

[0009] The travel directional valve is a three-position four-way directional valve.

[0010] The locking pin is located between the drive wheel of the travel reducer and the lower frame, and the locking pin is fixed to the lower frame by the brake cylinder B.

[0011] The rod chamber of the brake cylinder B is equipped with a spring, and the rodless chamber of the brake cylinder B is connected to a high-pressure hydraulic control valve.

[0012] The rodless chamber of the brake cylinder A is equipped with a spring, and the rod chamber of the brake cylinder A is connected to a shuttle valve and a low-pressure hydraulic control valve.

[0013] The high-pressure hydraulic control valve is a two-position three-way hydraulic control directional valve, and the low-pressure hydraulic control valve is a two-position two-way hydraulic control directional valve.

[0014] A throttle valve I is provided between the control end of the high-pressure hydraulic control valve and the output end of the shuttle valve.

[0015] A control method for a hydraulic control system for parking brakes of boom excavators. The hydraulic control system for parking brakes of boom excavators includes two parking modes: conventional and breaker. The conventional parking mode is when the solenoid valve is not energized, and the breaker parking mode is when the solenoid valve is energized.

[0016] The present invention has the following advantages: The hydraulic control system and method for parking brake of the boom excavator of the present invention adopts high and low pressure "cross" control of the hydraulic system to realize multiple selection of parking brake modes of the excavator. The two parking modes operate independently and do not interfere with each other; when parking, the drive wheels are locked to the frame as one unit, which greatly reduces the impact on the travel reducer when the boom excavator is working, and improves the life and reliability of the travel reducer; by utilizing the original travel pipeline configuration of the excavator, the function is increased without adding pipelines, thus reducing the cost of use. Attached Figure Description

[0017] The accompanying drawings, as part of this invention, are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation thereof. Clearly, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0018] In the attached diagram:

[0019] Figure 1 is a hydraulic principle diagram of the present invention.

[0020] Figure 2 is a schematic diagram of the locking pin position of the present invention.

[0021] In the diagram: 1. Friction disc assembly, 2. Travel motor, 3. Shuttle valve, 4. Travel directional valve, 5. Relief valve, 6. Main pump, 7. Hydraulic oil tank, 8. Pilot pump, 9. Solenoid valve, 10. High-pressure hydraulic control valve, 11. Throttle valve I, 12. Low-pressure hydraulic control valve, 13. Throttle valve II, 14. Check valve, 15. Brake cylinder A, 16. Brake cylinder B, 17. Locking pin, 18. Drive wheel, I. Travel reducer, II. Travel motor assembly.

[0022] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0023] To make the objectives, 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 with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0024] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limiting this invention.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] As shown in Figure 1, a hydraulic control system for parking brakes of a boom excavator includes a main pump 6. The main pump 6 is connected to a travel motor 2 via a travel reversing valve 4. The output end of the travel motor 2 is connected to a drive wheel 18 via a travel reducer I. A locking pin 17 is provided on one side of the drive wheel 18, and a brake cylinder B16 is connected to the locking pin 17. A friction disc assembly 1 is also provided on one side of the output end of the travel motor 2, and a brake cylinder A15 is provided on one side of the friction disc assembly 1.

[0027] It also includes a pilot pump 8, which is connected to a solenoid valve 9. The solenoid valve 9 is connected to a high-pressure hydraulic control valve 10, which is connected to a brake cylinder B16. The two input ends of the travel motor 2 are equipped with shuttle valves 3, which are connected to a brake cylinder A15 through a one-way valve 14. The brake cylinder A15 is also connected to a low-pressure hydraulic control valve 12 through a throttle valve II 13.

[0028] The control terminal of the high-pressure hydraulic control valve 10 is connected to the output terminal of the shuttle valve 3, and the control terminal of the low-pressure hydraulic control valve 12 is connected to the solenoid valve 9.

[0029] As shown in Figure 1, a hydraulic control system for the parking brake of a boom excavator is provided. The output end of the main pump 6 is connected to the hydraulic oil tank 7 via an overflow valve 5. This invention incorporates an overflow valve at the output end of the main pump to ensure the stability of the hydraulic system pressure.

[0030] Figure 1 shows a hydraulic control system for the parking brake of a boom excavator, wherein the travel directional valve 4 is a three-position four-way directional valve.

[0031] As shown in Figure 1, a hydraulic control system for the parking brake of a boom excavator is described. The locking pin 17 is located between the drive wheel of the travel reducer and the lower frame, and is fixed to the lower frame by a brake cylinder B16. This invention uses the locking pin to brake the brake cylinder B, and since the locking pin is fixed to the lower frame by the brake cylinder B, the drive wheel and the lower frame can be locked together when parked. This significantly reduces the impact on the travel reducer during boom excavator operation, improving the lifespan and reliability of the travel reducer.

[0032] Figure 1 shows a hydraulic control system for the parking brake of a boom excavator. The rod chamber of brake cylinder B16 is equipped with a spring, and the rodless chamber of brake cylinder B16 is connected to a high-pressure hydraulic control valve 10. The high-pressure hydraulic control valve 10 is a two-position three-way hydraulic directional valve. The rodless chamber of brake cylinder B in this invention controls oil supply through the combined action of a solenoid valve and the high-pressure hydraulic control valve. The high-pressure hydraulic control valve is a hydraulic control valve, and the hydraulic control oil is supplied by the main pump's oil circuit. When the main pump is operating normally and the excavator is working normally, the high-pressure hydraulic control valve is in the left position under the action of the hydraulic control oil. At this time, the rodless chamber of brake cylinder B is connected to the hydraulic oil tank. Under the action of the spring, the piston rod of brake cylinder B retracts, and it is in a non-braking state.

[0033] As shown in Figure 1, a hydraulic control system for the parking brake of a boom excavator is described. The rodless chamber of brake cylinder A15 is equipped with a spring, and the rod chamber of brake cylinder A15 is connected to a shuttle valve 3 and a low-pressure hydraulic control valve 12. The low-pressure hydraulic control valve 12 is a two-position, two-way hydraulic directional valve. In this invention, the rod chamber of brake cylinder A is connected to the main pump oil circuit via the shuttle valve. The oil supply source for the rod chamber is the same as that for the travel motor. The oil output from the rod chamber of brake cylinder A is controlled by the low-pressure hydraulic control valve. The hydraulic control oil for the low-pressure hydraulic control valve is supplied by the oil circuit of brake cylinder B. Therefore, when the main pump is operating normally and the excavator is working normally, brake cylinder A has brake oil supplied, while brake cylinder B has no brake oil. The control end of the low-pressure hydraulic control valve has no hydraulic oil and is in the left position, meaning brake cylinder A is in a non-braking state.

[0034] As shown in Figure 1, a hydraulic control system for the parking brake of a boom excavator is provided, wherein a throttle valve I11 is provided between the control end of the high-pressure hydraulic control valve 10 and the output end of the shuttle valve 3. The throttle valve at the control end of the high-pressure hydraulic control valve of this invention allows for slow changes in the valve core position, thereby achieving a delayed braking effect.

[0035] The present invention relates to a hydraulic control system for parking brakes in boom excavators, comprising a main pump connected to a travel motor assembly II and a travel reducer I. The main pump supplies pressurized oil to the drive wheels via a travel reversing valve and the travel motor. The travel motor and drive wheels are respectively equipped with brake cylinders A and B, which are used in different situations: brake cylinder A of the travel motor is used for normal parking, while brake cylinder B of the drive wheels is used for parking during breaking operations. The system also includes a pilot pump and multiple control valves for controlling the brake cylinders. Based on different working environments, the actions of the control valves select the operating state of brake cylinders A and B, thereby switching between the two braking modes. The valve bodies of the two brake cylinders are linked to ensure that the two parking modes operate independently without interference, improving the safety of equipment use. The specific connection relationships are as follows:

[0036] The hydraulic oil tank 7 is connected to the main pump 6 and pilot pump 8 via pipelines. The overflow valve 5 is connected to the oil outlet of the main pump 6 and the hydraulic oil tank 7. The oil outlet of the main pump 6 is also connected to the P port of the travel directional valve 4. The T port of the travel directional valve 4 is connected to the hydraulic oil tank 7. The A and B ports of the travel control valve 4 are connected to the travel motor assembly I, thereby driving the travel motor 2 to operate. The oil inlet of the shuttle valve 3 in the travel motor assembly I is connected to the main oil ports P1 / P2 of the motor 2 respectively. The S1 port of the shuttle valve is connected to the brake cylinder through the check valve 14. A15, on the other hand, is connected to the control terminal Y3 of the high-pressure hydraulic control valve 10 through the throttle valve I11; the oil outlet of the pilot pump 8 is connected to the solenoid valve 9, and the oil outlet of the solenoid valve 9 is connected to the P port of the high-pressure hydraulic control valve 10 on one hand, and to the control port Y4 of the low-pressure hydraulic control valve 12 on the other hand; the oil outlet A of the high-pressure hydraulic control valve 10 is connected to the brake cylinder B16, and the oil return port T is connected to the hydraulic oil tank 7; the oil port P of the low-pressure hydraulic control valve 12 is connected to the brake cylinder A15 through the throttle valve II, and the oil port A is connected to the hydraulic oil tank 7.

[0037] The hydraulic control system for parking brake of the boom excavator of the present invention has different operating procedures when the excavator is moving and stopped. When the excavator is stopped and moving, there are two parking modes: normal and crushing. When solenoid valve 9 is not energized, it is the normal parking mode; when solenoid valve 9 is energized, it is the crushing parking mode. The specific working process is as follows:

[0038] When the excavator is traveling, the main pump 6 operates to provide power. When the Y1 or Y4 of the travel reversing valve 4 is energized, high-pressure oil is supplied to the travel motor 2 and simultaneously passes through the S1 port of the shuttle valve 3. One path is connected to the rod chamber of the brake cylinder A15 through the check valve 14. The throttle valve 13 can maintain the pressure in the rod chamber of the brake cylinder A15, thereby pushing the brake cylinder A15 to retract and release the brake from the friction disc assembly 1. The other path pushes the high-pressure reversing valve 10 to the left position through the throttle valve O1. At this time, the rodless chamber of the brake cylinder B16 can be directly connected to the hydraulic oil tank 7 through the high-pressure hydraulic control valve 10. The rodless chamber of the brake cylinder B16 is under low pressure, and the internal spring of the brake cylinder B16 causes it to retract and unlock. The travel motor assembly II rotates forward or backward, driving the travel reducer I to realize the forward and backward movement of the excavator.

[0039] When solenoid valve 9 is not energized, it is in parking mode: When the excavator stops traveling, the travel motor oil ports P1 / P2 are connected to the hydraulic oil tank 7 and are at low pressure. The rod chamber of brake cylinder A15, connected to the travel motor 2 oil ports P1 / P2 via check valve 14 and shuttle valve 3, is also at low pressure. The spring in brake cylinder A15 causes the cylinder to extend and press against the friction disc assembly 1 to achieve parking brake. During this process, the hydraulic oil in the rod chamber of brake cylinder A15 is throttled by throttle valve II and passes through the low pressure... The hydraulic control valve 12 slowly flows back to the hydraulic oil tank 7 in the left position, realizing delayed parking brake. Since the solenoid valve 9 is not in the left position at this time, the rodless chamber of the brake cylinder B16 can be connected to the hydraulic oil tank 7 through the right position of the high-pressure hydraulic control valve 10 and then through the left position of the solenoid valve 9. The rodless chamber of the brake cylinder B16 is under low pressure, and the internal spring of the brake cylinder B16 causes it to retract and unlock. In this state, the brake cylinder B16 does not have the parking brake function, and the parking brake is realized by the brake cylinder A15.

[0040] When solenoid valve 9 is energized, it is in parking and crushing mode: When the excavator stops moving and is crushing, solenoid valve 9 is energized and is in the right position. The pilot pump 8 outputs pressure oil through the right position of solenoid valve 9. One path is connected to the control side Y4 of low-pressure hydraulic control valve 12, which pushes the hydraulic control valve 12 to switch to the right position and cut off the oil circuit. The other path is connected to the P port of high-pressure hydraulic control valve 10. When the excavator stops moving, there is no pressure oil on the Y3 side of high-pressure hydraulic control valve 10 and it is in the right position. The pressure oil is finally supplied to the rodless chamber of brake cylinder B16, which causes brake cylinder B16 to extend the locking pin 17 to lock the drive wheel 18 and realize parking brake. The throttling effect of throttle valve I can make high-pressure hydraulic control valve 10 slowly return to the right position to realize delayed parking brake. When the excavator is traveling, brake cylinder A15 is in the retracted and unlocked state. The rod chamber of brake cylinder A15 is under high pressure. When the excavator stops traveling, the hydraulic oil in the rod chamber of brake cylinder A15 is sealed off by the right-hand side of the check valve 14 and the low-pressure hydraulic control valve 12, maintaining a high-pressure state. This prevents brake cylinder A15 from extending and keeps it in the retracted and unlocked state. In this state, brake cylinder A15 does not function as the parking brake; the parking brake is activated by brake cylinder B16.

[0041] The present invention relates to a hydraulic control system and method for parking brakes for boom excavators. Without increasing the original oil circuit configuration, the hydraulic system controls the parking device, directly locking the drive wheels and the frame together. This greatly reduces the impact on the travel reducer during boom excavator operation and improves the life and reliability of the travel reducer. Both parking modes can achieve automatic parking and automatic unlocking without the need for additional driver operation, making it convenient and quick.

[0042] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0043] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A hydraulic control system for parking brakes specifically designed for boom excavators, characterized in that: The system includes a main pump (6), which is connected to a travel motor (2) via a travel reversing valve (4). The output end of the travel motor (2) is connected to a drive wheel (18) via a travel reducer (I). A locking pin (17) is provided on one side of the drive wheel (18), and the locking pin (17) is connected to a brake cylinder B (16). A friction disc assembly (1) is also provided on one side of the output end of the travel motor (2), and a brake cylinder A (15) is provided on one side of the friction disc assembly (1). The system also includes a pilot pump (8), which is connected to a solenoid valve (9). The solenoid valve (9) is connected to a high-pressure hydraulic control valve (10), and the high-pressure hydraulic control valve (10) is connected to the brake cylinder B (16). The two input ends of the travel motor (2) are provided with shuttle valves (3), which are connected to the brake cylinder A (15) via a check valve (14). The brake cylinder A (15) is also connected to a low-pressure valve via a throttle valve II (13). Hydraulic control valve (12); the control end of the high-pressure hydraulic control valve (10) is connected to the output end of the shuttle valve (3), and the control end of the low-pressure hydraulic control valve (12) is connected to the solenoid valve (9); the oil inlet of the shuttle valve (3) is connected to the main oil port P1 / P2 of the travel motor (2), and the S1 port of the shuttle valve is connected to the rod chamber of the brake cylinder A (15) through the check valve (14) on the one hand, and to the control end Y3 of the high-pressure hydraulic control valve (10) on the other hand; the pilot pump (8) The oil outlet is connected to the solenoid valve (9). The oil outlet of the solenoid valve (9) is connected to the P port of the high-pressure hydraulic control valve (10) on one hand and to the control port Y4 of the low-pressure hydraulic control valve (12) on the other hand. The oil outlet A of the high-pressure hydraulic control valve (10) is connected to the rodless chamber of the brake cylinder B (16), and the return port T is connected to the hydraulic oil tank (7). The oil port P of the low-pressure hydraulic control valve (12) is connected to the rod chamber of the brake cylinder A (15) through the throttle valve II (13), and the oil port A is connected to the hydraulic oil tank (7).

2. The hydraulic control system for parking brake of a boom excavator as described in claim 1, characterized in that: The output end of the main pump (6) is connected to the hydraulic oil tank (7) through the overflow valve (5).

3. The hydraulic control system for parking brake of a boom excavator as described in claim 1, characterized in that: The travel directional valve (4) is a three-position four-way directional valve.

4. The hydraulic control system for parking brake of a boom excavator as described in claim 1, characterized in that: The locking pin (17) is located between the drive wheel of the travel reducer and the lower frame. The locking pin (17) is fixed to the lower frame by the brake cylinder B (16).

5. The hydraulic control system for parking brake of a boom excavator as described in claim 1, characterized in that: The rod chamber of the brake cylinder B (16) is equipped with a spring, and the rodless chamber of the brake cylinder B (16) is connected to a high-pressure hydraulic control valve (10).

6. The hydraulic control system for parking brake of a boom excavator as described in claim 1, characterized in that: The rodless chamber of the brake cylinder A (15) is equipped with a spring, and the rod chamber of the brake cylinder A (15) is connected to the shuttle valve (3) and the low-pressure hydraulic control valve (12).

7. The hydraulic control system for parking brake of a boom excavator as described in claim 1, characterized in that: The high-pressure hydraulic control valve (10) is a two-position three-way hydraulic control directional valve, and the low-pressure hydraulic control valve (12) is a two-position two-way hydraulic control directional valve.

8. The hydraulic control system for parking brake of a boom excavator as described in claim 1, characterized in that: A throttle valve I (11) is provided between the control end of the high-pressure hydraulic control valve (10) and the output end of the shuttle valve (3).

9. A method for using the hydraulic control system for the parking brake of a boom excavator as described in claim 1, characterized in that: The hydraulic control system for parking brakes of the boom excavator includes two parking modes: normal and crushing. When the solenoid valve (9) is not energized, it is in the normal parking mode; when the solenoid valve (9) is energized, it is in the crushing parking mode.

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