Tensioning hydraulic system, screen scarifier, working device and excavator

Abstract

The utility model discloses a tensioning hydraulic system, a screen scarifier, a working device and an excavator, the tensioning hydraulic system comprises a tensioning oil cylinder, a tensioning valve, a main valve, a reversing valve and a flush valve, the tensioning oil cylinder is used for tensioning a chain in the screen scarifier; the tensioning valve is provided with a plurality of oil ports, and two of the oil ports are communicated with a rod cavity and a rodless cavity of the tensioning oil cylinder; the main valve is respectively communicated with the tensioning valve and a driving wheel motor in the screen cleaning machine through the reversing valve, when the tensioning oil cylinder is not tensioned, the driving wheel motor does not work, and when the tensioning oil cylinder is tensioned, the driving wheel motor starts to work; and the flushing valve is provided with a plurality of oil ports, is communicated with the driving wheel motor and is used for enabling high-temperature oil in the driving wheel motor to flow out to an oil tank. The screen cleaning machine is arranged to be an oil cylinder tensioning system, and the tensioning effect can be guaranteed; and the flushing valve is additionally arranged to reduce the oil temperature of the driving wheel motor, so that the performance of the motor is better exerted, and the service life of the screen scarifier is prolonged.

Description

Technical Field

[0001] The utility model relates to a tensioning hydraulic system and belongs to the technical field of railway machinery. Background Art

[0002] With the rapid development of rail transit lines and the long-term use of railway lines, the roadbed is dirty and the ballast is broken, which has a great impact on the line status and performance, and is crucial for the maintenance and repair of the track. Therefore, a cleaning machine excavator attachment has emerged, which can realize the functions of ballast removal and cleaning at the bottom of the rail sleeper. However, after the cleaning machine works for a long time, the chain is prone to loosening, which causes the ballast to enter between the cleaning machine wheel and the chain. In the worst case, the machine stops running, and in the worst case, the chain is stuck in the ballast of the rail sleeper; and due to the special layout of the cleaning machine's driving wheel motor, the compact pipeline layout, and long-term high-load operation, the driving wheel motor heats up seriously, thereby losing most of the energy, resulting in a significant reduction in the working efficiency of the driving wheel motor.

[0003] The prior art is a screw mechanical tensioning mechanism. After each work of the cleaning machine is completed, the screw mechanism needs to be manually tensioned. In the working process, if the chain is loose, the machine needs to be stopped for tensioning. If the tensioning is not timely, it will cause damage to the cleaning machine chain, sprocket and other components. In addition, due to the special working conditions of the railway, the shutdown for maintenance will have a serious impact on the normal operation of the train. There is no connection between the tensioning mechanism of the prior art and the operation of the cleaning machine. Therefore, when the cleaning machine is ready to run, it is impossible to determine whether the chain is in a tensioned state, thereby affecting the normal operation of the work.

[0004] The cleaning machine of the prior art has a relatively compact overall structure, and the driving wheel motor is arranged in an inverted manner. The driving wheel motor generates severe heat, loses a lot of energy, and also has a certain impact on the life of the motor. Summary of the invention

[0005] In view of the deficiencies in the prior art, the utility model provides a tensioning hydraulic system, which opens the manual reversing valve of the tensioning valve before work to realize automatic tensioning of the oil cylinder; the driving wheel motor starts working only after the tensioning cylinder builds up pressure, thereby improving safety; a flushing valve is added to the driving wheel motor, which can introduce part of the return oil flow into the motor, thereby reducing the oil temperature inside the motor and ensuring the performance of the motor.

[0006] The utility model is implemented according to the following technical solutions:

[0007] In a first aspect, the utility model provides a tensioning hydraulic system, comprising:

[0008] Tensioning cylinder, used to tension the chain in the screen cleaning machine;

[0009] A tensioning valve having a plurality of oil ports, two of which are connected to the rod chamber and the rodless chamber of the tensioning oil cylinder;

[0010] The main valve and the reversing valve are respectively connected with the tensioning valve and the driving wheel motor in the screen cleaning machine through the reversing valve. When the tensioning cylinder is not tensioned, the driving wheel motor does not work. When the tensioning cylinder is tensioned, the driving wheel motor starts to work.

[0011] In some embodiments, the tensioning valve is composed of a shuttle valve, a pressure reducing valve, a relief valve, a manual reversing valve, and a hydraulically controlled one-way valve, and automatic tensioning of the tensioning cylinder is achieved through the manual reversing valve.

[0012] In some embodiments, the overflow valve is connected to the reversing valve. After the oil pressure established by the tensioning cylinder after tensioning is greater than the set pressure of the overflow valve, the pressure oil flows from the overflow valve to the reversing valve, and the oil from the main valve is input into the driving wheel motor through the reversing valve to start working.

[0013] In some embodiments, the tensioning valve has an A3 oil port, a B3 oil port, an A4 oil port, a B4 oil port, a C3 oil port, and a T3 oil port; the A3 oil port and the B3 oil port are connected to the shuttle valve and the main valve, the A4 oil port is connected to the rodless chamber of the tensioning cylinder and the hydraulically controlled one-way valve, the B4 oil port is connected to the rod chamber of the tensioning cylinder, the C3 oil port is connected to the overflow valve and the reversing valve, and the T3 oil port is connected to the oil tank.

[0014] In some embodiments, a flushing valve is also included, which has multiple oil ports and is connected to the driving wheel motor to flow the high-temperature oil in the driving wheel motor out to the oil tank.

[0015] In some embodiments, the flushing valve is composed of a hydraulically controlled reversing valve, a pressure reducing valve and a throttle valve. Part of the return oil flow is introduced into the driving wheel motor through the hydraulically controlled reversing valve, and the high-temperature oil in the driving wheel motor flows out to the oil tank.

[0016] In some embodiments, the flushing valve has an A2 oil port, a B2 oil port, and a T2 oil port, and the driving wheel motor has an A1 oil port, a B1 oil port, a T1 oil port, and an F oil port; the A2 oil port is connected to the A1 oil port, the B2 oil port is connected to the B1 oil port, the hydraulically controlled reversing valve is connected to the A2 oil port and the B2 oil port, the T2 oil port is connected to the F oil port, and the T1 oil port is connected to the oil tank.

[0017] In a second aspect, the utility model also provides a screening machine equipped with the above-mentioned tensioning hydraulic system.

[0018] In a third aspect, the utility model further provides a working device, including a movable arm and a quick-change joint connected thereto, and the above-mentioned screening machine is installed on the quick-change joint.

[0019] In a fourth aspect, the utility model further provides an excavator, comprising a walking device, a slewing device and the above-mentioned working device.

[0020] Beneficial effects of the utility model:

[0021] The screening machine is set up with an oil cylinder tensioning system to ensure the tensioning effect; it ensures that the driving wheel motor starts working only after the screening machine system is tensioned, avoiding malfunction of the driving wheel motor when the system is not tensioned; adding a flushing valve to cool down the oil temperature of the driving wheel motor, better exerting the performance of the motor and prolonging the service life of the screening machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0023] In the attached picture:

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

[0025] Figure identification: 1-main valve, 2-reversing valve, 3-driving wheel motor, 4-hydraulic controlled reversing valve, 5-pressure reducing valve, 6-throttle valve, 7-flushing valve, 8-shuttle valve, 9-pressure reducing valve, 10-overflow valve, 11-manual reversing valve, 12-hydraulic controlled check valve, 13-tensioning valve, 14-tensioning cylinder, 15-oil tank.

[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 utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figure 1 As shown, a tensioning hydraulic system includes a tensioning cylinder 14, a tensioning valve 13, a main valve 1, and a reversing valve 2. The tensioning cylinder 14 is used to tension the chain in the screening machine; the tensioning valve 13 has multiple oil ports, two of which are connected to the rod chamber and the rodless chamber of the tensioning cylinder 14; the main valve 1 is connected to the tensioning valve 13 and the driving wheel motor 3 in the screening machine through the reversing valve 2 respectively. When the tensioning cylinder 14 is not tensioned, the driving wheel motor 3 does not work. When the tensioning cylinder 14 is tensioned, the driving wheel motor 3 starts to work.

[0031] Continue to refer to Figure 1 As shown, the tensioning valve 13 is composed of a shuttle valve 8, a pressure reducing valve 9, a relief valve 10, a manual reversing valve 11, and a hydraulically controlled one-way valve 12. The tensioning oil cylinder 14 is automatically tensioned through the manual reversing valve 11. The relief valve 10 is connected to the reversing valve 2. After the oil pressure established by the tensioning oil cylinder 14 is greater than the set pressure of the relief valve 10, the pressure oil flows from the relief valve 10 to the reversing valve 2, and the oil from the main valve 1 is input into the driving wheel motor 3 through the reversing valve 2 to start working.

[0032] The tensioning valve 13 has A3 oil port, B3 oil port, A4 oil port, B4 oil port, C3 oil port and T3 oil port; the A3 oil port and B3 oil port are connected to the shuttle valve 8 and the main valve 1, the A4 oil port is connected to the rodless chamber of the tensioning cylinder 14 and the hydraulically controlled one-way valve 12, the B4 oil port is connected to the rod chamber of the tensioning cylinder 14, the C3 oil port is connected to the overflow valve 10 and the reversing valve 2, and the T3 oil port is connected to the oil tank 15.

[0033] For further solutions, please refer to Figure 1As shown, it also includes a flushing valve 7, which has multiple oil ports and is connected to the driving wheel motor 3, and is used to flow the high-temperature oil in the driving wheel motor 3 out to the oil tank 15. The flushing valve 7 is composed of a hydraulically controlled reversing valve 4, a pressure reducing valve 5 and a throttle valve 6. A part of the return oil flow is introduced into the driving wheel motor 3 through the hydraulically controlled reversing valve 4, and the high-temperature oil in the driving wheel motor 3 flows out to the oil tank 15.

[0034] The flushing valve 7 has an A2 oil port, a B2 oil port, and a T2 oil port, and the driving wheel motor 3 has an A1 oil port, a B1 oil port, a T1 oil port, and an F oil port; the A2 oil port is connected to the A1 oil port, the B2 oil port is connected to the B1 oil port, the hydraulically controlled reversing valve 4 is connected to the A2 oil port and the B2 oil port, the T2 oil port is connected to the F oil port, and the T1 oil port is connected to the oil tank 15.

[0035] The working process of the above tensioning hydraulic system is given below:

[0036] like Figure 1 As shown, when the main valve 1 works in the left position, the high-pressure oil enters from the P oil port, enters the tensioning valve 13 from the A3 oil port, passes through the shuttle valve 8, and then passes through the pressure reducing valve 9, passes through the manual reversing valve 10 to the upper position, passes through the hydraulically controlled non-return valve 12, and finally enters the rodless chamber of the tensioning cylinder 14 from the A4 oil port. The tensioning cylinder 6 realizes the tensioning function, and then the oil flows out of the rod chamber of the tensioning cylinder 14, and returns to the main valve 1 through the tensioning valve 5; when the tensioning cylinder 14 realizes the tensioning function, the oil circuit builds up pressure, and the pressure is greater than the set pressure of the relief valve 10, the pressure oil flows out from the C3 oil port to the reversing valve 2, and the reversing valve 2 is cut from the left position. Switch to the right position to work, the oil from the main valve 1 is input into the driving wheel motor 3 through the A1 oil port through the reversing valve 2, the motor starts to work, the oil flows out from the B1 oil port, and returns to the T oil port of the main valve 1 through the reversing valve 2; if the tensioning cylinder 14 fails to achieve tensioning, that is, the oil circuit has not established a pressure greater than the set pressure of the relief valve 10, the reversing valve 2 works in the left position at this time, so the driving wheel motor 3 does not work, that is, the driving wheel motor 3 does not work when the cylinder is not tensioned, and the driving wheel motor 3 can start to work when the tensioning cylinder 14 is successfully tensioned. There is a sequential relationship between the two, thereby ensuring the safety of the tensioning system.

[0037] Due to the special arrangement of the driving wheel motor 3, in order to avoid the heating of the driving wheel motor 3 during long-term operation, a hot oil flushing valve 7 is installed to flush the inside of the motor and reduce the temperature inside the motor. When the high-pressure oil flows out from the B1 oil port through the A1 oil port of the driving wheel motor 3, it returns to the main valve 1 through the reversing valve 2, and at the same time, the high-pressure oil enters the flushing valve 7 through the A2 oil port, the hydraulic control reversing valve 4 changes direction from the middle position to the lower position, and the oil enters the flushing valve 7 from the B2 oil port, and then flows out from the T2 oil port through the pressure reducing valve 5, and flows into the F oil port of the driving wheel motor 3, and the high-temperature oil in the driving wheel motor 3 flows out from the T1 oil port to the oil tank 15, so as to reduce the temperature inside the motor.

[0038] As can be seen from the above, the utility model provides a tensioning hydraulic system, which opens the manual reversing valve of the tensioning valve before working to realize automatic tensioning of the oil cylinder; the driving wheel motor starts working only after the tensioning cylinder builds up pressure, thereby improving safety; a flushing valve is added to the driving wheel motor, which can introduce part of the return oil flow into the motor, thereby reducing the oil temperature inside the motor and ensuring the performance of the motor.

[0039] The utility model also provides a screening machine which is equipped with the tensioning hydraulic system.

[0040] The utility model also provides a working device, comprising a movable arm and a quick-change joint connected thereto, and the above-mentioned screen cleaning machine is installed on the quick-change joint.

[0041] The utility model also provides an excavator, comprising a power device, a walking device, a rotating device and the above-mentioned working device.

[0042] The power unit of the excavator generally adopts a diesel engine, which is fixed on the turntable through a vibration reduction device to provide power for its traveling device, rotating device and working device.

[0043] The traveling device of the excavator supports the whole weight of the excavator and completes the traveling task, and is mostly crawler type and tire type.

[0044] The excavator's slewing device allows the upper part of the vehicle to slew left or right to facilitate excavation and unloading.

[0045] The working device of the excavator is used to directly complete the excavation task, including the boom, arm, bucket and connecting rod mechanism.

[0046] The hydraulic system of the excavator transmits the power output by the engine to the working device and the traveling device.

[0047] The electrical system of the excavator is mainly used to detect some temperatures, pressures, speeds, and switching quantities of the engine, hydraulic pump, main valve, and actuators (hydraulic cylinders, hydraulic motors), and transmit the relevant detection data to the excavator's dedicated controller. The controller integrates various measurement values, set values, and operation signals to send relevant control information to control the engine, hydraulic pump, main valve, and the entire machine.

[0048] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can 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.

[0049] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present utility model and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by the present application.

[0050] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this patent can make some changes or modify the technical content suggested above into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of the solution of the utility model.

Claims

1. A tensioning hydraulic system, characterized in that: include: Tensioning cylinder, used to tension the chain in the screen cleaning machine; A tensioning valve having a plurality of oil ports, two of which are connected to the rod chamber and the rodless chamber of the tensioning oil cylinder; The main valve and the reversing valve are respectively connected with the tensioning valve and the driving wheel motor in the screen cleaning machine through the reversing valve. When the tensioning cylinder is not tensioned, the driving wheel motor does not work. When the tensioning cylinder is tensioned, the driving wheel motor starts to work.

2. A tensioning hydraulic system according to claim 1, characterized in that: The tensioning valve is composed of a shuttle valve, a pressure reducing valve, a relief valve, a manual reversing valve, and a hydraulically controlled one-way valve, and the tensioning cylinder is automatically tensioned by the manual reversing valve.

3. A tensioning hydraulic system according to claim 2, characterized in that: The overflow valve is connected to the reversing valve. After the oil pressure established by the tensioning cylinder is greater than the set pressure of the overflow valve, the pressure oil flows from the overflow valve to the reversing valve, and the oil from the main valve is input into the driving wheel motor through the reversing valve to start working.

4. A tensioning hydraulic system according to claim 2, characterized in that: The tensioning valve has an A3 oil port, a B3 oil port, an A4 oil port, a B4 oil port, a C3 oil port, and a T3 oil port; The A3 and B3 oil ports are connected to the shuttle valve and the main valve, the A4 oil port is connected to the rodless chamber of the tensioning cylinder and the hydraulically controlled one-way valve, the B4 oil port is connected to the rod chamber of the tensioning cylinder, the C3 oil port is connected to the overflow valve and the reversing valve, and the T3 oil port is connected to the oil tank.

5. A tensioning hydraulic system according to claim 1, characterized in that: It also includes a flushing valve with multiple oil ports, which is connected to the driving wheel motor and is used to flow the high-temperature oil in the driving wheel motor out to the oil tank.

6. A tensioning hydraulic system according to claim 5, characterized in that: The flushing valve is composed of a hydraulically controlled reversing valve, a pressure reducing valve and a throttle valve. Part of the return oil flow is introduced into the driving wheel motor through the hydraulically controlled reversing valve, and the high-temperature oil in the driving wheel motor flows out to the oil tank.

7. A tensioning hydraulic system according to claim 6, characterized in that: The flushing valve has an A2 oil port, a B2 oil port, and a T2 oil port, and the driving wheel motor has an A1 oil port, a B1 oil port, a T1 oil port, and an F oil port; The A2 oil port is connected to the A1 oil port, the B2 oil port is connected to the B1 oil port, the hydraulically controlled reversing valve is connected to the A2 oil port and the B2 oil port, the T2 oil port is connected to the F oil port, and the T1 oil port is connected to the oil tank.

8. A cleaning machine, characterized in that: A tensioning hydraulic system according to any one of claims 1 to 7 is installed.

9. A working device, comprising a movable arm and a quick-change joint connected thereto, characterized in that: The screening machine according to claim 8 is installed on the quick-change joint.

10. An excavator, comprising a traveling device and a slewing device, characterized in that: Also includes the working device as described in claim 9.

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