Hydraulic control system capable of preventing grounding damage and material grabbing machine

Abstract

The utility model provides a hydraulic control system capable of preventing grounding damage and a material grabbing machine, and belongs to the technical field of excavators. In the hydraulic control system capable of preventing grounding damage, a control oil way used for supplying oil to a movable arm main valve to control lifting of a movable arm is connected between a movable arm handle and the movable arm main valve, and a grounding damage prevention oil way is connected between a pilot pump and the control oil way or between the pilot pump and the movable arm main valve. The hydraulic control system capable of preventing grounding damage has a normal working state and a grounding-preventing working state. The material grabbing machine comprises a material grabbing machine body and a hydraulic control system capable of preventing grounding damage. According to the utility model, through the arrangement of the anti-grounding-damage oil way and the combined use of the valves, in the bottom cleaning operation process, under the condition that the auxiliary tool is grounded and generates larger acting force on the cabin bottom or the carriage bottom, oil is directly supplied to the movable arm main valve by utilizing the anti-grounding-damage oil way; the movable arm can be automatically lifted under the condition that manual operation is not needed, and a cabin or the bottom of a train box is prevented from being damaged.

Description

Technical Field

[0001] The utility model belongs to the technical field of excavators, in particular to a hydraulic control system and a material grabber capable of preventing bottoming damage. Background Art

[0002] Grab machines are often used for ship unloading, train unloading and other operations. The traditional grab machine consists of two parts: the grab machine body and the hydraulic system. The structure of the grab machine body is shown in the attached Figure 1 , including a vehicle body 1 and a boom 2 connected to the vehicle body 1, a boom 3 is provided at one end of the boom 2 away from the vehicle body 1, a pair of grabs 4 are connected to one end of the boom 3 away from the boom 2, and the grabs 4 can be opened and closed to grab materials.

[0003] The hydraulic system of the traditional grabber is shown in the attached Figure 2 , including a main valve, a pilot control part for controlling the movement of the valve core of the main valve, an execution part for driving the corresponding parts of the vehicle body 1 under the control of the main valve, a hydraulic oil tank 5, a pilot pump 6 for supplying oil to the pilot control part, and a main pump 7 for supplying oil to the main valve; the execution part includes a boom cylinder 10 arranged between the vehicle body 1 and the boom 2 and used to drive the boom 2, an arm cylinder 9 arranged between the boom 2 and the arm 3 and used to drive the arm 3, and a grab cylinder 8 arranged between the arm 3 and the grab 4 and used to drive the grab 4; the main valve includes a boom main valve 12 and a grab main valve 11 for controlling the boom cylinder 10 and the grab cylinder 8 respectively; the pilot control part includes a boom handle 24 and a grab handle 23, and the boom handle 24 and the grab handle 23 are respectively used to control the valve core movement of the boom main valve 12 and the grab main valve 11 to realize pilot control.

[0004] In the final clearance and bottom cleaning stages of ship and train unloading operations, the grab of the grabber is likely to come into direct contact with the bottom of the ship or train box. If the grabber closes too quickly and cannot be lifted in time, it will exert a large force on the bottom of the ship or train box, causing damage to the bottom of the ship or train box. In particular, if the driver of the grabber does not have sufficient vision or is not skilled in operation, the bottom of the ship or train box may be scratched. In addition, the above problems also exist in the process of the loader shoveling and transporting goods on the platform. The structure used by the loader to shovel goods is a bucket, and the cylinder that drives the bucket to rotate is a bucket cylinder. The grab in the grabber and the bucket on the loader are collectively referred to as auxiliary tools, and the grab cylinder and the bucket cylinder are collectively referred to as auxiliary tool cylinders. At present, how to lift the auxiliary tool in time after it touches the bottom to avoid damaging the bottom of the ship or train box is a technical problem that needs to be solved urgently by technical personnel in this field. Utility Model Content

[0005] The utility model aims to provide a hydraulic control system for preventing bottoming damage, so as to solve the technical problem in the prior art that the auxiliary tools of the grabber and loader cannot be lifted up in time after hitting the bottom of the cabin or the bottom of the train box, thus easily damaging the bottom of the cabin or the bottom of the train box.

[0006] The utility model aims to provide a material grabber to solve the technical problem that the auxiliary tool of the material grabber in the prior art cannot be lifted up in time after hitting the bottom of a ship cabin or a train box, thus easily damaging the bottom of the ship cabin or the train box.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the hydraulic control system for preventing bottoming damage provided by the utility model is:

[0008] 1. The jackup jack of claim 1, wherein the jackup jack is connected to a control valve which is located adjacent to the control valve lift and the control valve has a pressure relief valve which is provided to the control valve lift. The jackup jack is connected to a control valve which is provided to the control valve lift and the control valve has a pressure relief valve which is provided to the control valve lift.

[0009] As a further improvement, the normally closed valve is a normally closed proportional solenoid valve.

[0010] As a further improvement, the hydraulic control system for preventing bottoming damage has a bottom clearing operation mode and a non-bottom clearing operation mode, and a switching switch is provided on the circuit between the controller and the pressure detection device, or on the circuit between the controller and the two-position three-way valve, or on the circuit between the controller and the normally open valve and the normally closed valve; when the switching switch is in a closed state, the hydraulic control system for preventing bottoming damage is in a bottom clearing operation mode, and when the switching switch is in an open state, the hydraulic control system for preventing bottoming damage is in a non-bottom clearing operation mode.

[0011] As a further improvement, the pressure detection device is installed on the cylinder body of the auxiliary tool cylinder.

[0012] As a further improvement, the pressure detection device is a pressure sensor.

[0013] The beneficial effect is that the hydraulic control system for preventing bottoming damage provided by the utility model is an improvement over the prior art. The hydraulic control system for preventing bottoming damage sets an anti-bottoming damage oil circuit between the pilot pump and the control oil circuit or between the pilot pump and the boom main valve, and through the control of the valve, when the pressure value detected by the pressure sensor exceeds the set value, the anti-bottoming damage oil circuit is in a connected state, the pilot pump directly supplies hydraulic oil to the boom main valve to control the movement of the valve core of the boom main valve, and the boom is automatically and timely lifted without manual operation, preventing the auxiliary equipment from damaging the bottom of the cabin or the bottom of the train box.

[0014] In order to achieve the above-mentioned purpose, the technical solution of the material grabber provided by the utility model is:

[0015] A material grabber includes a material grabber body and a hydraulic control system to prevent bottoming out damage. The hydraulic control system to prevent bottoming out damage includes an auxiliary oil cylinder, a boom main valve, a boom handle, and a pilot pump. The pilot pump is connected to the boom handle through an oil supply line. A control oil line for supplying oil to the boom main valve to control the lifting of the boom is connected between the boom handle and the boom main valve. The control oil line also includes a pressure detection device for detecting the oil pressure of the rodless chamber of the auxiliary oil cylinder, a controller connected to the pressure detection device to receive its detection signal, and the pilot pump and the control oil An anti-bottoming damage oil circuit is connected between the two control oil circuits or between the pilot pump and the boom main valve, a two-position three-way valve is connected at the intersection of the anti-bottoming damage oil circuit and the control oil circuit, or a normally closed valve is provided on the anti-bottoming damage oil circuit and a normally open valve is provided on the control oil circuit, the two-position three-way valve or the normally closed valve and the normally open valve are connected to a controller to control the two-position three-way valve to switch positions or control the normally closed valve to open and the normally open valve to close when the oil pressure in the rodless chamber is greater than a set value, and then the pilot pump supplies oil to the boom main valve through the anti-bottoming damage oil circuit to automatically control the lifting of the boom.

[0016] As a further improvement, the normally closed valve is a normally closed proportional solenoid valve.

[0017] As a further improvement, the hydraulic control system for preventing bottoming damage has a bottom clearing operation mode and a non-bottom clearing operation mode, and a switching switch is provided on the circuit between the controller and the pressure detection device, or on the circuit between the controller and the two-position three-way valve, or on the circuit between the controller and the normally open valve and the normally closed valve; when the switching switch is in a closed state, the hydraulic control system for preventing bottoming damage is in a bottom clearing operation mode, and when the switching switch is in an open state, the hydraulic control system for preventing bottoming damage is in a non-bottom clearing operation mode.

[0018] As a further improvement, the pressure detection device is installed on the cylinder body of the auxiliary tool cylinder.

[0019] As a further improvement, the pressure detection device is a pressure sensor.

[0020] The beneficial effect is that the grabber provided by the utility model is an improvement over the prior art. The anti-bottoming damage hydraulic control system in the grabber sets an anti-bottoming damage oil circuit between the pilot pump and the control oil circuit or between the pilot pump and the boom main valve, and through the control of the valve, when the pressure value detected by the pressure sensor exceeds the set value, the anti-bottoming damage oil circuit is in a connected state, and the pilot pump directly provides hydraulic oil to the boom main valve to control the movement of the valve core of the boom main valve, so that the boom is automatically and timely lifted without manual operation, preventing the auxiliary equipment from damaging the bottom of the cabin or the bottom of the train box. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the main body of the material grabber in the background technology;

[0022] Figure 2 It is a structural schematic diagram of the hydraulic system of the material grabber in the background technology;

[0023] Figure 3 It is a structural schematic diagram of a hydraulic control system for preventing bottoming damage in Example 1 of a material grabber of the utility model;

[0024] Figure 4 It is a structural schematic diagram of a hydraulic control system for preventing bottoming damage in Example 2 of a material grabber of the utility model;

[0025] Figure 5 It is a structural schematic diagram of the hydraulic control system for preventing bottoming damage in Example 3 of the grabber of the utility model.

[0026] Description of reference numerals:

[0027] 1. Vehicle body; 2. Boom; 3. Arm; 4. Grab; 5. Hydraulic oil tank; 6. Pilot pump; 7. Main pump; 8. Grab cylinder; 9. Arm cylinder; 10. Boom cylinder; 11. Grab main valve; 12. Boom main valve; 13. Lifting control interface; 14. Control oil circuit; 15. Anti-bottoming damage oil circuit; 16. Normally closed valve; 17. Normally open valve; 18. Main oil circuit; 19. First branch oil circuit; 20. Second branch oil circuit; 21. Oil drain pipeline; 22. Pressure sensor; 23. Grab handle; 24. Boom handle. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the embodiments.

[0029] In order to solve the problems in the prior art, the basic concept of the utility model is to set up an anti-bottoming damage oil circuit and use valves in combination. During the bottom cleaning operation, when the auxiliary equipment touches the bottom and exerts a large force on the bottom of the cabin or the bottom of the train, the anti-bottoming damage oil circuit is used to directly supply oil to the main valve of the boom, so that the boom can be automatically lifted without manual operation to prevent damage to the bottom of the cabin or the bottom of the train.

[0030] Specific embodiment 1 of the grabber provided by the utility model:

[0031] The material grabber comprises a material grabber body and a hydraulic control system for preventing bottoming damage.

[0032] See attached Figure 1 The main body of the material grabber includes a vehicle body 1 and a boom 2 connected to the vehicle body 1. A bucket 3 is provided at one end of the boom 2 away from the vehicle body 1. A pair of grabs 4 are connected at one end of the bucket 3 away from the boom 2. The grabs 4 can be opened and closed to grab materials. The grabs 4 in this embodiment are an auxiliary tool of the material grabber. In other embodiments, the auxiliary tool of the material grabber can also be two grabs that cross each other after closing, which will not be described in detail here.

[0033] See attached Figure 3 The hydraulic control system for preventing bottoming damage includes a main valve, a pilot control part for controlling the movement of the valve core of the main valve, an execution part for driving the corresponding parts of the vehicle body 1 under the control of the main valve, a hydraulic oil tank 5, a pilot pump 6 for supplying oil to the pilot control part, and a main pump 7 for supplying oil to the main valve.

[0034] The execution part includes a grab cylinder 8 for driving the grab 4 to rotate, an arm cylinder 9 for driving the arm 3 to extend and fold, a boom cylinder 10 for driving the boom 2 to rise and fall, and a hydraulic motor for driving the vehicle body 1 to rotate and travel. The grab cylinder 8 for driving the grab 4 constitutes an auxiliary cylinder.

[0035] The main valve includes a grab bucket connection and a boom connection, which respectively constitute a grab bucket main valve 11 and a boom main valve 12. The grab bucket main valve 11 has an oil inlet interface, an oil return interface, two main interfaces and two pilot control interfaces, wherein the oil inlet interface is connected to the main pump 7, the oil return interface is connected to the hydraulic oil tank 5, the two main interfaces are respectively connected to the two interfaces on the grab bucket cylinder 8, and the two interfaces on the grab bucket cylinder 8 are respectively connected to the rod chamber and the rodless chamber. The boom main valve 12 has an oil inlet interface, an oil return interface, two main interfaces and two pilot control interfaces, wherein the oil inlet interface is connected to the main pump 7, the oil return interface is connected to the hydraulic oil tank 5, the two main interfaces are respectively connected to the two interfaces on the boom cylinder 10, the two interfaces on the boom cylinder 10 are respectively connected to the rod chamber and the rodless chamber, and one of the two pilot control interfaces of the boom main valve 12 is a lifting control interface 13 that controls the movement of the valve core when oil is inlet, thereby causing the rodless chamber of the boom cylinder 10 to inlet oil and the rod chamber to discharge oil. The main valve can also provide hydraulic pressure to other structures such as the boom cylinder 9 and the hydraulic motor, which is a prior art and will not be described in detail here.

[0036] The pilot control part includes a boom handle 24 and a grab handle 23. The grab handle 23 has an oil inlet interface, an oil return interface and two output interfaces. The oil inlet interface of the grab handle 23 is connected to the pilot pump 6, the oil return interface of the grab handle 23 is connected to the hydraulic oil tank 5, and the two output interfaces of the grab handle 23 are respectively connected to the two pilot control interfaces of the grab main valve 11. The grab handle 23 can make one of the two output interfaces supply oil and the other return oil, so as to move the valve core of the grab main valve 11, thereby controlling the extension and retraction of the grab cylinder 8. The boom handle 24 has an oil inlet interface, an oil return interface and two output interfaces. The oil inlet interface of the boom handle 24 is connected to the pilot pump 6, the oil return interface of the boom handle 24 is connected to the hydraulic oil tank 5, and the two output interfaces of the boom handle 24 are respectively connected to the two pilot control interfaces of the boom main valve 12. The boom handle 24 can supply oil to one of the two output interfaces and return oil to the other, so as to move the valve core of the boom main valve 12, thereby controlling the extension and retraction of the boom cylinder 10.

[0037] A control oil circuit 14 is connected between an output interface of the boom handle 24 and the lifting control interface 13, and an anti-bottoming damage oil circuit 15 is connected to the control oil circuit 14, and one end of the anti-bottoming damage oil circuit 15 away from the control oil circuit 14 is connected to the pilot pump 6. A normally closed valve 16 is provided on the anti-bottoming damage oil circuit 15, and in this embodiment, the normally closed valve 16 is specifically a normally closed proportional solenoid valve. The proportional solenoid valve is also provided with a return oil interface for discharging internal leakage when internal leakage occurs due to valve core wear after long-term use. The return oil interface is connected to the hydraulic oil tank 5 through the oil drain pipe 21. This is a prior art and will not be described in detail here. The opening of the proportional solenoid valve can be adjusted as needed, thereby adjusting the pressure input to the lifting control interface 13. A normally open valve 17 is provided on the control oil circuit 14. The normally open valve 17 is a normally open solenoid valve. The normally open valve 17 is located on the control oil circuit 14 between the anti-bottoming damage oil circuit 15 and the boom handle 24, that is, the connection point between the anti-bottoming damage oil circuit 15 and the control oil circuit 14 is located between the normally open valve 17 and the lifting control interface 13.

[0038] The hydraulic control system for preventing bottoming damage also includes a controller, which is electrically connected to the normally closed valve 16 and the normally open valve 17. The controller can send command signals to the normally closed valve 16 and the normally open valve 17 to control the actions of the normally closed valve 16 and the normally open valve 17. A pressure detection device is provided on the cylinder body of the grab cylinder 8. The pressure detection device is specifically a pressure sensor 22. The pressure sensor 22 is electrically connected to the controller. The pressure sensor 22 can directly and in real time monitor the pressure in the rodless cavity of the grab cylinder 8 and transmit the obtained signal to the controller. A switching switch for controlling the circuit on and off of the pressure sensor 22 and the controller is provided between the pressure sensor 22 and the controller.

[0039] In the present embodiment, the hydraulic control system for preventing the material grabber from bottoming out has two working modes, namely, a bottom clearing operation mode and a non-bottom clearing operation mode.

[0040] In the non-bottom-clearing operation mode, the circuit between the pressure sensor 22 and the controller is cut off by using a switching switch, and the electrical signal obtained by the pressure sensor 22 cannot be transmitted to the controller. The controller cannot send a command signal to the normally closed valve 16 and the normally open valve 17 to control their actions when it cannot obtain the signal provided by the pressure sensor 22. In the non-bottom-clearing operation mode, the normally open valve 17 is in a normally open state, and the hydraulic oil in the control oil circuit 14 flows normally, while the normally closed valve 16 is in a normally closed state to ensure that the pressure in the control oil circuit 14 will not leak. In this mode, the lifting control interface 13 is provided with pressure by the hydraulic oil in the control oil circuit 14, and the flow path of the hydraulic oil formed in the control oil circuit 14 constitutes the control oil circuit.

[0041] In the bottom cleaning operation mode, the circuit between the pressure sensor 22 and the controller is turned on by using a switching switch. After receiving the signal input by the pressure sensor 22, the controller compares it with the set value and outputs the set current. The output current is divided into two parts, one part is used to power the normally open valve 17 to control the opening and closing of the normally open valve 17, and the other part is used to power the normally closed valve 16 to control the opening and closing and opening size of the normally closed valve 16.

[0042] In the bottom cleaning operation mode, the normally open valve 17 and the normally closed valve 16 have two working states, namely the normal working state and the anti-bottoming working state. The range of the pressure sensor 22 is 0~60Mpa. When the grabber is working, the pressure in the rodless chamber of the grab bucket cylinder 8 is generally between 0-32Mpa. When the pressure value detected by the pressure sensor 22 is less than 10Mpa, the controller does not output current. At this time, the normally open valve 17 is in the normally open state, the normally closed valve 16 is in the normally closed state, and the control valve assembly is in a normal working state; when the pressure value detected by the pressure sensor 22 is greater than or equal to 10Mpa, it is considered that the grab bucket 4 has touched the bottom of the cabin. At this time, the controller outputs current, and the current supplies power to the normally open valve 17 and the normally closed valve 16 and controls the normally open valve 17 to cut off the control oil circuit 14 to prevent pressure relief, and controls the normally closed valve 16 to open to connect the anti-bottoming damage oil circuit 15. At this time, the control valve assembly is in the anti-bottoming working state. When the control valve assembly is in the anti-bottoming working state, the boom 2 operating handle can no longer supply oil to the lifting control interface 13, and the normally closed valve 16 on the anti-bottoming destruction oil circuit 15 is used to supply oil to the lifting control interface 13. Under non-human operation, the rodless chamber of the boom cylinder 10 is automatically filled with oil, so that the boom 2 is lifted, and the grab 4 is also lifted accordingly to prevent the grab 4 from scratching the bottom of the cabin during the closing process.

[0043] When the pressure value detected by the pressure sensor 22 is greater than or equal to 10Mpa, the current value provided by the controller to the normally closed valve 16 will also be adjusted according to the pressure value, thereby adjusting the opening size of the normally closed valve 16, and finally controlling the lifting speed of the boom 2. Specifically, when the pressure value detected by the pressure sensor 22 is greater than or equal to 10Mpa and less than 15Mpa, the current value output by the controller is 200mA; when the pressure value detected by the pressure sensor 22 is greater than or equal to 15Mpa and less than 25Mpa, the current value output by the controller is 300mA; when the pressure value detected by the pressure sensor 22 is greater than or equal to 25Mpa and less than or equal to 32Mpa, the current value output by the controller is 400mA.

[0044] When a normal grabber is cleaning the bottom and grabbing materials, the grab 4 needs to be closed against the bottom of the cabin. During the closing process of the grab 4, the boom 2 also needs to be lifted at a corresponding speed so that the grab 4 is kept close to the bottom of the cabin without scratching the bottom of the cabin. The faster the grab 4 is closed, the faster the boom 2 needs to be lifted. When the pressure value detected by the pressure sensor 22 is large, it means that the grab 4 has exerted a large force on the bottom of the cabin. Further, it also means that the lifting speed of the boom 2 does not match the closing speed of the grab 4. In this embodiment, when the pressure value detected by the pressure sensor 22 is small, the lifting speed of the boom 2 is also relatively small. When the pressure value detected by the pressure sensor 22 is large, the lifting speed of the boom 2 is also relatively large. Therefore, the lifting speed of the boom 2 can be well matched with the closing speed of the grab 4, so that while preventing the grab 4 from scratching the bottom of the cabin, it can also ensure that the grab 4 can grab enough materials at one time to ensure the efficiency of the bottom cleaning operation.

[0045] The material grabber in this embodiment can be modified on the basis of a traditional material grabber. Specifically, it is only necessary to add a pressure sensor 22, a controller, an anti-bottoming oil circuit, a normally closed valve 16, and a normally open valve 17 to the hydraulic system of the traditional material grabber.

[0046] In other embodiments, the switch can be set in other ways. For example, the switch can be set in the circuit between the controller and the normally closed valve and the normally open valve. In this embodiment, in the non-bottom cleaning mode, the switch is used to cut off the electrical connection between the controller and the normally closed valve and the normally open valve. The controller cannot provide current to the normally closed valve and the normally open valve, and naturally cannot control the action of the normally closed valve and the normally open valve. In other embodiments, the switch may not be set, and the material grabber in this embodiment has only a bottom cleaning operation mode.

[0047] In other embodiments, the pressure sensor may also be disposed in an oil circuit connected to the rodless chamber of the grab bucket oil cylinder to indirectly detect the oil pressure in the rodless chamber of the grab bucket oil cylinder.

[0048] In other embodiments, the end of the anti-bottoming damage oil circuit away from the pilot pump can also be directly connected to the pilot control interface together with the control oil circuit through a three-way joint.

[0049] Specific embodiment 2 of the material grabbing machine provided by the utility model:

[0050] This embodiment is based on embodiment 1, and the difference from embodiment 1 is that, see attached Figure 4In this embodiment, the normally closed valve 16 is a normally closed solenoid valve, which can only control the on-off of the anti-bottoming damage oil circuit 15 but cannot control the pressure. In this embodiment, in the bottom cleaning operation mode, when the pressure value detected by the pressure sensor 22 is greater than the set value, the controller controls the normally open valve 17 to disconnect the control oil circuit to prevent pressure relief, and at the same time controls the normally closed valve 16 to connect the anti-bottoming damage oil circuit, so that the boom is automatically lifted to prevent the grab from scratching the bottom of the cabin.

[0051] In other embodiments, the normally closed valve 16 and the normally open valve 17 may also be other electric valves other than solenoid valves.

[0052] Specific embodiment 3 of the material grabbing machine provided by the utility model:

[0053] This embodiment is based on embodiment 1, and the difference from embodiment 1 is that, see attached Figure 5 In this embodiment, the lifting control interface 13 is connected to a main oil circuit 18, and the end of the main oil circuit 18 away from the lifting control interface 13 is connected to a normally open valve 17. The normally open valve 17 in this embodiment is a two-position three-way valve, and the other two interfaces of the two-position three-way valve are respectively connected to a first branch oil circuit 19 and a second branch oil circuit 20. The end of the first branch oil circuit 19 away from the main oil circuit 18 is connected to the boom handle 24, and the end of the second branch oil circuit 20 away from the main oil circuit 18 is connected to the pilot pump 6.

[0054] The two-position three-way valve is electrically connected to the controller, and the controller controls the action of the two-position three-way valve according to the pressure value detected by the pressure sensor 22. When the pressure value detected by the pressure sensor 22 is less than the set value, the two-position three-way valve connects the first branch oil circuit 19 with the main oil circuit 18, and cuts off the connection between the second branch oil circuit 20 and the main oil circuit 18; when the pressure value detected by the pressure sensor 22 is greater than the set value, the two-position three-way valve connects the second branch oil circuit 20 with the main oil circuit 18, and cuts off the connection between the first branch oil circuit 19 and the main oil circuit 18.

[0055] In this embodiment, the main oil circuit and the first branch oil circuit constitute a control oil circuit, and the second branch oil circuit constitutes an anti-bottoming damage oil circuit.

[0056] Specific embodiments of the hydraulic control system for preventing bottoming damage provided by the utility model include:

[0057] The hydraulic control system for preventing bottoming out damage is the hydraulic control system for preventing bottoming out damage in any one of the specific embodiments 1-3 of the above-mentioned grabber, and will not be described in detail here.

[0058] In addition to being used in a grabber, the hydraulic control system for preventing bottoming damage can also be used in a loader, where the bucket in the loader constitutes an auxiliary tool, and the bucket cylinder for driving the bucket constitutes an auxiliary tool cylinder.

[0059] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A hydraulic control system for preventing bottoming damage, comprising an auxiliary oil cylinder, a boom main valve, a boom handle, and a pilot pump, wherein the pilot pump is connected to the boom handle through an oil supply line, and a control oil line for supplying oil to the boom main valve to control the lifting of the boom is connected between the boom handle and the boom main valve, wherein the control oil line is characterized in that: It also includes a pressure detection device for detecting the oil pressure in the rodless chamber of the auxiliary oil cylinder, and a controller connected to the pressure detection device to receive its detection signal. An anti-bottoming damage oil circuit is connected between the pilot pump and the control oil circuit or between the pilot pump and the boom main valve. A two-position three-way valve is connected to the intersection of the anti-bottoming damage oil circuit and the control oil circuit, or a normally closed valve is provided on the anti-bottoming damage oil circuit and a normally open valve is provided on the control oil circuit. The two-position three-way valve or the normally closed valve and the normally open valve are connected to the controller to control the two-position three-way valve to switch positions or control the normally closed valve to open and the normally open valve to close when the oil pressure in the rodless chamber is greater than a set value, so that the pilot pump supplies oil to the boom main valve through the anti-bottoming damage oil circuit to automatically control the lifting of the boom.

2. The anti-bottoming hydraulic control system according to claim 1, characterized in that: The normally closed valve is a normally closed proportional solenoid valve.

3. The anti-bottoming hydraulic control system according to claim 1 or 2, characterized in that: The hydraulic control system for preventing bottoming damage has a bottom clearing operation mode and a non-bottom clearing operation mode. A switching switch is provided on the circuit between the controller and the pressure detection device, or on the circuit between the controller and the two-position three-way valve, or on the circuit between the controller and the normally open valve and the normally closed valve; when the switching switch is in a closed state, the hydraulic control system for preventing bottoming damage is in a bottom clearing operation mode, and when the switching switch is in an open state, the hydraulic control system for preventing bottoming damage is in a non-bottom clearing operation mode.

4. The anti-bottoming hydraulic control system according to claim 1 or 2, characterized in that: The pressure detection device is installed on the cylinder body of the auxiliary tool cylinder.

5. The anti-bottoming hydraulic control system according to claim 1 or 2, characterized in that: The pressure detection device is a pressure sensor.

6. A material grabber, comprising a material grabber body and a hydraulic control system for preventing bottoming out, wherein the hydraulic control system for preventing bottoming out comprises an auxiliary oil cylinder, a boom main valve, a boom handle, and a pilot pump, wherein the pilot pump is connected to the boom handle through an oil supply line, and a control oil line for supplying oil to the boom main valve to control the lifting of the boom is connected between the boom handle and the boom main valve, wherein the control oil line is characterized in that: It also includes a pressure detection device for detecting the oil pressure in the rodless chamber of the auxiliary oil cylinder, and a controller connected to the pressure detection device to receive its detection signal. An anti-bottoming damage oil circuit is connected between the pilot pump and the control oil circuit or between the pilot pump and the boom main valve. A two-position three-way valve is connected to the intersection of the anti-bottoming damage oil circuit and the control oil circuit, or a normally closed valve is provided on the anti-bottoming damage oil circuit and a normally open valve is provided on the control oil circuit. The two-position three-way valve or the normally closed valve and the normally open valve are connected to the controller to control the two-position three-way valve to switch positions or control the normally closed valve to open and the normally open valve to close when the oil pressure in the rodless chamber is greater than a set value, so that the pilot pump supplies oil to the boom main valve through the anti-bottoming damage oil circuit to automatically control the lifting of the boom.

7. The material grabber according to claim 6, characterized in that: The normally closed valve is a normally closed proportional solenoid valve.

8. The material grabber according to claim 6 or 7, characterized in that: The hydraulic control system for preventing bottoming damage has a bottom clearing operation mode and a non-bottom clearing operation mode. A switching switch is provided on the circuit between the controller and the pressure detection device, or on the circuit between the controller and the two-position three-way valve, or on the circuit between the controller and the normally open valve and the normally closed valve; when the switching switch is in a closed state, the hydraulic control system for preventing bottoming damage is in a bottom clearing operation mode, and when the switching switch is in an open state, the hydraulic control system for preventing bottoming damage is in a non-bottom clearing operation mode.

9. The material grabber according to claim 6 or 7, characterized in that: The pressure detection device is installed on the cylinder body of the auxiliary tool cylinder.

10. The material grabber according to claim 6 or 7, characterized in that: The pressure detection device is a pressure sensor.

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