Low-energy-consumption hydraulic grab bucket system and grab bucket thereof

Abstract

The low-energy-consumption hydraulic grab bucket system comprises an execution unit, a hydraulic control unit and a pressure maintaining unit, the execution unit is used for controlling claw petals to be opened or closed through telescopic driving of a hydraulic cylinder, and the hydraulic control unit comprises a servo motor and a control valve block. The servo motor provides hydraulic oil for the control valve block through the driving oil pump, the control valve block communicates with the execution unit and controls the hydraulic cylinder to stretch out and draw back by switching a hydraulic oil flowing path, and the pressure maintaining unit communicates with the execution unit and the hydraulic control unit and comprises a pressure sensor assembly. When the pressure sensor assembly reaches the set opening or closing pressure, the pressure sensor assembly sends an electric signal to the servo motor and enables the servo motor to stop, and the hydraulic grab bucket system enters a pressure maintaining state; according to the utility model, quick start and stop can be realized to realize sensitive action and closed-loop control of pressure, so that the total energy consumption of the hydraulic grab bucket is reduced, the maintenance difficulty is reduced, and the fault frequency is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of grab buckets, and particularly relates to a low - energy - consumption hydraulic grab bucket system and a grab bucket thereof. Background Art

[0002] A grab bucket is a device for automatically grasping items. It can load and unload a large amount of bulk materials in situ, such as grains, coal, soil, and garbage. However, when the existing grab bucket grabs garbage, due to the garbage fermentation process, the temperature in the garbage bin is higher than the outside air temperature, resulting in various faults frequently occurring in components such as seals and oil leakage in the hydraulic system due to excessive use temperature; and the motor of the traditional hydraulic grab bucket has been in a working state all the time when it is not operating. It is calculated that the traditional hydraulic grab bucket is in a non - working state for 84% of the time every day or every year, and the real running time is only 16%. Therefore, the motor of the traditional hydraulic grab bucket keeps rotating during closing, opening, and intermittent periods, consuming a large amount of electric energy, especially wasting a large amount of energy when there is no work done. Content of the Utility Model

[0003] The purpose of the utility model is to provide a low - energy - consumption hydraulic grab bucket system and a grab bucket thereof. The device uses a servo motor as the power source for the hydraulic grab bucket. During a relatively long intermittent period, the servo motor is in a stopped state (without consuming electric energy), thus reducing the total energy consumption of the hydraulic grab bucket. And the servo motor has a pressure control function for the whole system through a pressure sensor assembly, which can reduce the hydraulic valves in the hydraulic system, greatly simplify the hydraulic system, and at the same time, the simplified system can also reduce the difficulty of maintenance and reduce the failure frequency.

[0004] The utility model is realized through the following technical solutions:

[0005] A low - energy - consumption hydraulic grab bucket system, comprising:

[0006] An execution unit, which controls the opening or closing of the claw petals by driving the telescopic movement of a hydraulic cylinder;

[0007] A hydraulic control unit, which includes a servo motor and a control valve block. The servo motor provides hydraulic oil to the control valve block by driving an oil pump. The control valve block is connected to the execution unit and controls the telescopic movement of the hydraulic cylinder by switching the flow path of the hydraulic oil;

[0008] A pressure - maintaining unit, which connects the execution unit and the hydraulic control unit. The pressure - maintaining unit includes a pressure sensor assembly. When the pressure sensor assembly reaches the set opening or closing pressure, the pressure sensor assembly sends an electrical signal to the servo motor and stops the servo motor, and the hydraulic grab bucket system enters a pressure - maintaining state.

[0009] In this solution, the hydraulic control unit uses a servo motor as the power source to supply driving hydraulic oil to the hydraulic cylinder and control the telescopic drive of the hydraulic cylinder to control the opening or closing of the claw petals. Moreover, the servo motor has a pressure control function for the entire system through the pressure sensor assembly. When the pressure sensor assembly reaches the set opening or closing pressure, the pressure sensor assembly sends an electrical signal to the servo motor and stops the servo motor. The hydraulic grab system enters the pressure-holding state. In this way, the servo motor is in a stopped state (without consuming electrical energy) during a relatively long intermittent period, reducing the total energy consumption of the hydraulic grab. Since the oil pump and other hydraulic components do not work for a long time, the heat generation is small and the temperature of the hydraulic oil is low. At the same time, through the pressure feedback of the pressure sensor assembly to the entire system, the hydraulic valves of the hydraulic system can also be reduced, greatly simplifying the hydraulic system, thereby reducing the difficulty of maintenance and repair of the entire system and greatly reducing the probability of failure of the hydraulic grab.

[0010] As a further technical solution of the hydraulic grab system, to further simplify the entire hydraulic system, the pressure-holding unit further includes a hydraulic lock unit, and the pressure sensor assembly includes a first pressure sensor and a second pressure sensor;

[0011] Among them, the hydraulic lock unit includes a first hydraulic control check valve and a second hydraulic control check valve. The first hydraulic control check valve is communicated with one of the oil ports of the control valve block. The first pressure sensor is used to monitor the oil circuit pressure of the first hydraulic control check valve. The second hydraulic control check valve is communicated with the other oil port of the control valve block. The second pressure sensor is used to monitor the oil circuit pressure of the second hydraulic control check valve.

[0012] As a further technical solution of the hydraulic grab system, the hydraulic control unit further includes a temperature sensor. The temperature sensor is arranged in the fuel tank and is electrically connected to the servo motor.

[0013] In this solution, when the oil temperature of the hydraulic system is too high, the temperature sensor sends a high-temperature warning to the servo motor and the central control. When the temperature exceeds the set maximum temperature value, the servo motor will stop working to protect the hydraulic system.

[0014] As a further technical solution of the hydraulic grab system, the hydraulic control unit further includes a liquid level relay. The liquid level relay is arranged in the fuel tank. When the hydraulic grab system is short of oil, the liquid level relay sends a prohibited start signal to the servo motor.

[0015] As a further technical solution of the hydraulic grab system, the hydraulic control unit further includes an oil sight glass. The oil sight glass is immersed in the fuel tank and is used to display the height of the hydraulic oil level.

[0016] As a further technical solution of the hydraulic grab system, the hydraulic control unit further includes an oil return filter, which is connected to the hydraulic oil return path to filter the system return oil to ensure the cleanliness of the oil.

[0017] As a further technical solution of the hydraulic grab system, the hydraulic control unit further includes a relief valve. The inlet and outlet of the relief valve are respectively connected to the outlet of the oil pump and the hydraulic oil return path. When the system is over-pressured, the relief valve automatically opens to protect the components.

[0018] As a further technical solution of the hydraulic grab system, the control valve block includes a main directional valve and a pilot directional valve. The pilot directional valve is electrically connected to an external control component and drives the main directional valve to switch the hydraulic oil flow path after receiving a drive signal.

[0019] A grab includes a low-energy-consumption hydraulic grab system according to any one of the above technical solutions. The hydraulic grab system uses a servo motor as a power source to drive the claw petals to open or close.

[0020] A grab further includes a grab body and a guardrail. Among them, the guardrail is centrosymmetrically distributed with the grab body as the center. The claw petals are connected to the lower part of the grab body through pin shafts, and the claw petals are centrosymmetric with the grab body as the center.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] The present invention uses a servo motor as a power source to supply driving hydraulic oil to the hydraulic cylinder and controls the telescopic drive of the hydraulic cylinder to control the opening or closing of the claw petals. And the servo motor has a pressure control function for the entire system through a pressure sensor assembly. When the pressure sensor assembly reaches the set opening or closing pressure, the pressure sensor assembly sends an electrical signal to the servo motor and stops the servo motor. The hydraulic grab system enters a pressure-holding state. In this way, the servo motor is in a stopped state (without consuming electric energy) during a relatively long intermittent period, reducing the total energy consumption of the hydraulic grab. And since the oil pump and other hydraulic components do not work for a long time, the heat generation is small and the temperature of the hydraulic oil is low. At the same time, through the pressure feedback of the pressure sensor assembly to the entire system, the hydraulic valves of the hydraulic system can also be reduced, greatly simplifying the hydraulic system, thereby reducing the difficulty of maintenance and repair of the entire system and greatly reducing the probability of failure of the hydraulic grab. Description of the Drawings

[0023] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0024] Figure 1 It is a schematic diagram of the operation process of the present utility model;

[0025] Figure 2 It is a schematic diagram of the hydraulic control principle of the present utility model;

[0026] Figure 3 It is a schematic diagram of the hydraulic control principle when the grab bucket is closed in the present utility model;

[0027] Figure 4 It is a schematic diagram of the hydraulic control principle when the grab bucket is opened in the present utility model;

[0028] Figure 5 It is a top view schematic diagram of the present utility model;

[0029] Figure 6 It is a schematic diagram of the structure of the hydraulic control unit of the present utility model;

[0030] Figure 7 It is a three-dimensional structure schematic diagram of the present utility model.

[0031] Marks and corresponding component names in the attached drawings:

[0032] 1 - hydraulic cylinder, 2 - first pressure sensor, 3 - second pressure sensor, 4 - hydraulic lock unit, 4.1 - first hydraulic control check valve, 4.2 - second hydraulic control check valve, 5 - control valve block, 6 - main valve of the directional control valve, 7 - pilot valve of the directional control valve, 8 - return oil filter, 9 - oil sight glass, 10 - relief valve, 11 - liquid level relay, 12 - temperature sensor, 13 - oil pump, 14 - servo motor, 15 - claw flap, 16 - guardrail, 17 - oil pump assembly, 18 - fuel tank, 19 - connecting plate. Specific embodiments

[0033] To make the purpose, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in combination with embodiments and the attached drawings. The illustrative embodiments and descriptions thereof of the present utility model are only used to explain the present utility model and shall not be construed as a limitation to the present utility model.

[0034] Embodiment 1

[0035] This Embodiment 1 provides a low - energy - consumption hydraulic grab bucket system, as Figure 2 shown, including an execution unit, a hydraulic control unit and a pressure - maintaining unit;

[0036] Among them, as Figure 2 shown, the execution unit includes a plurality of hydraulic cylinders 1. The hydraulic cylinder 1 includes a rodless cavity and a rod - end cavity. When the rodless cavity and the rod - end cavity are subjected to driving hydraulic oil in different directions, the telescopic drive of the hydraulic cylinder 1 will be formed. And through the telescopic drive of the plurality of hydraulic cylinders 1, the opening or closing of the claw flap 15 can be controlled.

[0037] Among them, please refer to again Figure 2 As shown, the hydraulic control unit includes a servo motor 14 and a control valve block 5. The servo motor 14 supplies hydraulic oil to the control valve block 5 by driving an oil pump 13. Specifically, the control valve block 5 includes a main directional valve 6 and a pilot directional valve 7. The pilot directional valve 7 is electrically connected to an external control component and drives the main directional valve 6 to switch the hydraulic oil flow path after receiving a driving signal, so as to achieve the purpose of controlling the opening or closing of the claw petals 15.

[0038] At the same time, the hydraulic control unit also includes a temperature sensor 12, a liquid level relay 11, an oil sight glass 9, an oil return filter 8 and a relief valve 10. Among them, the temperature sensor 12, the liquid level relay 11 and the oil sight glass 9 are all installed in the fuel tank 18. Specifically, the temperature sensor 12 is electrically connected to the servo motor 14. When the oil temperature of the hydraulic grab system is too high, the temperature sensor 12 issues a high temperature warning to the servo motor 14 and the central control. When the temperature exceeds the set maximum temperature value, the servo motor 14 will stop working to protect the hydraulic system; the liquid level relay 11 is electrically connected to the servo motor 14. When the hydraulic grab system is short of oil, the liquid level relay 11 sends a prohibited start signal to the servo motor 14; the oil sight glass 9 is immersed and installed at the bottom of the fuel tank 18 for displaying the height of the hydraulic oil level in real time on the central control; and, to further protect the components, in this embodiment, the oil inlet and outlet of the relief valve 10 are respectively connected to the outlet of the oil pump 13 and the hydraulic oil return path. When the system is overpressured, the relief valve automatically opens, so that the overpressured hydraulic oil can return in time through the relief valve.

[0039] Among them, please refer to again Figure 2 As shown, the pressure maintaining unit includes a hydraulic lock unit 4 and a pressure sensor assembly. The hydraulic lock unit 4 connects the execution unit and the hydraulic control unit. The pressure sensor assembly is used to monitor the oil passing pressure of the hydraulic lock unit 4. When the pressure sensor assembly reaches the set opening or closing pressure, the pressure sensor assembly sends an electrical signal to the servo motor 14 and stops the servo motor 14, so that the hydraulic grab system enters a pressure maintaining state.

[0040] Specifically, the hydraulic lock unit 4 includes a first hydraulic check valve 4.1 and a second hydraulic check valve 4.2. The pressure sensor assembly includes a first pressure sensor 2 and a second pressure sensor 3. The first hydraulic check valve 4.1 is connected to one oil port of the main directional valve 6. The first pressure sensor 2 is connected to the oil path where the first hydraulic check valve 4.1 is located and is used to monitor the oil path pressure of the first hydraulic check valve 4.1. Similarly, the second hydraulic check valve 4.2 is connected to the other oil port of the main directional valve 6. The second pressure sensor 3 is connected to the oil path where the second hydraulic check valve is located and is used to monitor the oil path pressure of the second hydraulic check valve 4.2.

[0041] The working process of this embodiment is as follows:

[0042] The process of the grab closing: As Figure 1 and Figure 3 shown, by activating the hydraulic grab closing button of the external control component, the YV2 driver on the pilot valve 7 of the reversing valve and the servo motor 14 simultaneously receive working signals. The YV2 driver drives the pilot valve 7 of the reversing valve to switch to the right position as shown in Figure 3 . At this time, the servo motor 14 drives the oil pump 13 to draw hydraulic oil from the oil tank 18. The pressurized oil pushes the main valve 6 of the reversing valve to also switch to the right position through the right position of the pilot valve 7 of the reversing valve. The pressurized oil enters the first hydraulic check valve 4.1 through the main valve 6 of the reversing valve that is conducting at this time. At this time, the pressurized oil forms a high-pressure position at the left position of the hydraulic cylinder 1 and enters the rodless cavity of the hydraulic cylinder 1 to push the hydraulic cylinder out (the hydraulic grab closes). At the same time, the hydraulic oil in the rod cavity of the hydraulic cylinder 1 passes through the second hydraulic check valve 4.2 and returns to the oil tank through the oil return filter 8. When the first pressure sensor 2 reaches the set closing pressure, the first pressure sensor 2 sends an electrical signal to stop the servo motor 14, and the hydraulic grab enters the closed pressure-holding state. In this way, the servo motor 14 is in a stopped state (without consuming electrical energy) during the intermittent time period, which reduces the total energy consumption of the hydraulic grab. The oil pump 13 and other hydraulic components do not work for a long time, reducing the heat generation.

[0043] The process of the grab opening: As Figure 1 and Figure 4 shown, by activating the hydraulic grab closing button of the external control component, the YV1 driver on the pilot valve 7 of the reversing valve and the servo motor 14 simultaneously receive working signals. The YV1 driver drives the pilot valve 7 of the reversing valve to switch to the left position as shown in Figure 4 . At this time, the servo motor 14 drives the oil pump 13 to draw hydraulic oil from the oil tank 18. The pressurized oil pushes the main valve 6 of the reversing valve to also switch to the left position through the left position of the pilot valve 7 of the reversing valve. The pressurized oil enters the second hydraulic check valve 4.2 through the main valve 6 of the reversing valve that is conducting at this time. At this time, the pressurized oil forms a high-pressure position at the right position of the hydraulic cylinder 1 and enters the rod cavity of the hydraulic cylinder 1 to push the hydraulic cylinder back (the hydraulic grab opens). At the same time, the hydraulic oil in the rodless cavity of the hydraulic cylinder 1 passes through the first hydraulic check valve 4.1 and returns to the oil tank through the oil return filter 8. When the second pressure sensor 3 reaches the set opening pressure, the second pressure sensor 3 sends an electrical signal to stop the servo motor 14, and the hydraulic grab enters the open pressure-holding state.

[0044] Embodiment 2

[0045] This Embodiment 2 provides a grab, as Figures 5 - 7As shown in the figure, it includes the hydraulic grab system, connecting plate 19, grab body and guardrail 16 in Embodiment 1. The upper end surface of the connecting plate 19 is connected to the guardrail 16, and the lower end surface of the connecting plate 19 is connected to the grab body. Specifically, the inside of the guardrail 16 is hollow and is symmetrically distributed around the grab body on the upper end surface of the connecting plate 19. The claw petals 15 are connected to the lower part of the grab body through pin shafts, and the claw petals 15 are symmetrically distributed around the grab body, such as a two-claw grab, a six-claw grab or other multi-claw grabs.

[0046] The output end of the hydraulic cylinder 1 is connected to the claw petals 15, and the expansion and contraction of the hydraulic cylinder 1 is used to control the opening and closing of the claw petals 15. The fuel tank 18, the servo motor 14 and the oil pump assembly 17 are all installed in the hollow inside of the guardrail 16, and the hollow inside of the guardrail 16 can play a certain role in sealing and protecting the servo motor 14 and the oil pump assembly 17.

[0047] This embodiment simplifies the hydraulic system of the hydraulic grab. The existing hydraulic system needs to use 11 hydraulic valve parts to realize the actions of the hydraulic grab. This embodiment only needs to adopt 3 hydraulic valve parts, namely an overflow valve, a directional control valve and a hydraulic lock, which improves the reliability and maintainability of the hydraulic system.

[0048] The specific embodiments described above further elaborate on the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low energy consumption hydraulic grab system, characterized in that: include: An execution unit, which is used to control the opening or closing of the claw flap (15) through the extension and contraction drive of the hydraulic cylinder (1); A hydraulic control unit, the hydraulic control unit comprising a servo motor (14) and a control valve block (5), the servo motor (14) driving an oil pump (13) to provide hydraulic oil to the control valve block (5), the control valve block (5) being connected to the actuator unit and controlling the extension and retraction of the hydraulic cylinder (1) by switching a hydraulic oil flow path; A pressure-maintaining unit, the pressure-maintaining unit is connected to the execution unit and the hydraulic control unit, the pressure-maintaining unit includes a pressure sensor assembly, when the pressure sensor assembly reaches a set opening or closing pressure, the pressure sensor assembly sends an electrical signal to the servo motor (14) and stops the servo motor (14), and the hydraulic grab system enters a pressure-maintaining state.

2. A low energy consumption hydraulic grab bucket system according to claim 1, characterized in that: The pressure maintaining unit further comprises a hydraulic lock unit (4), and the pressure sensor assembly comprises a first pressure sensor (2) and a second pressure sensor (3); The hydraulic lock unit (4) comprises a first hydraulically controlled one-way valve (4.1) and a second hydraulically controlled one-way valve (4.2); the first hydraulically controlled one-way valve (4.1) is connected to one of the oil ports of the control valve block (5); the first pressure sensor (2) is used to monitor the oil circuit pressure of the first hydraulically controlled one-way valve (4.1); the second hydraulically controlled one-way valve (4.2) is connected to the other oil port of the control valve block (5); and the second pressure sensor (3) is used to monitor the oil circuit pressure of the second hydraulically controlled one-way valve (4.2).

3. A low energy consumption hydraulic grab bucket system according to claim 1, characterized in that: The hydraulic control unit further comprises a temperature sensor (12), wherein the temperature sensor (12) is arranged in the oil tank (18), and the temperature sensor (12) is electrically connected to the servo motor (14).

4. A low energy consumption hydraulic grab bucket system according to claim 1, characterized in that: The hydraulic control unit also includes a liquid level relay (11), which is arranged in an oil tank (18). When the hydraulic grab system is short of oil, the liquid level relay (11) sends a start-prohibiting signal to the servo motor (14).

5. A low energy consumption hydraulic grab bucket system according to claim 1, characterized in that: The hydraulic control unit further comprises an oil mirror (9), wherein the oil mirror (9) is immersed in the oil tank (18).

6. A low energy consumption hydraulic grab bucket system according to claim 1, characterized in that: The hydraulic control unit further comprises an oil return filter (8), wherein the oil return filter (8) is connected to the hydraulic oil return path.

7. A low energy consumption hydraulic grab bucket system according to claim 1, characterized in that: The hydraulic control unit also includes a relief valve (10), the oil inlet and outlet of the relief valve (10) being respectively connected to the outlet of the oil pump (13) and the hydraulic oil return path.

8. The low energy consumption hydraulic grab bucket system according to claim 1, characterized in that: The control valve block (5) comprises a reversing valve main valve (6) and a reversing valve pilot valve (7); the reversing valve pilot valve (7) is electrically connected to an external control component and drives the reversing valve main valve (6) to switch the hydraulic oil flow path after a driving signal is reached.

9. A grab bucket, characterized in that: It comprises a low-energy hydraulic grab system as described in any one of claims 1 to 8, wherein the hydraulic grab system uses a servo motor (14) as a power source to drive the claw valve (15) to open or close.

10. A grab bucket according to claim 9, characterized in that: It comprises a grab bucket body and a guardrail (16), wherein the guardrail is centrally symmetrically distributed with the grab bucket body as the center, the claw flap (15) is connected to the lower part of the grab bucket body through a pin shaft, and the claw flap (15) is centrally symmetrical with the grab bucket body as the center.

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