Anti-tilting system of hoisting machinery and hoisting machinery

Abstract

The utility model provides an anti-tilting system of a hoisting machine and the hoisting machine, and belongs to the field of engineering equipment. The anti-tilting system of the hoisting machinery comprises a reversing valve, a driving oil cylinder, a pilot handle and an electromagnetic valve, the driving oil cylinder and the pilot handle are both connected with the reversing valve through oil ways, and the electromagnetic valve is connected in the oil way between the pilot handle and the reversing valve. The inclination angle sensor or the inclination angle switch is used for being installed on a vehicle body and / or a chassis of the hoisting machinery to detect the inclination angle of the vehicle body and / or the chassis, and the inclination angle sensor or the inclination angle switch is connected into a control circuit of the electromagnetic valve. The hoisting machinery comprises a vehicle body of the hoisting machinery, a chassis and the anti-tilting system of the hoisting machinery. The tipping risk of the hoisting machinery is reflected by utilizing the inclination angle of the hoisting machinery main body, the control is more accurate, a main oil way connected with the driving oil cylinder does not need to be changed, and the risk of hydraulic oil leakage of the main oil way can be reduced.

Description

Technical Field

[0001] The utility model belongs to the field of engineering equipment, in particular to a lifting machinery anti-tilt system and the lifting machinery. Background Art

[0002] Lifting machinery includes grabbers, pipelayers, etc. In some cases, excavators are also used to lift and transfer materials. Take the grabber as an example. If the grabber grabs a lot of materials at a time or the grab bucket is far away from the chassis, the grabber will be unstable and shake a lot during operation. The service life of the grabber will be greatly reduced and there is a risk of tipping over.

[0003] In order to solve the above technical problems, the existing Chinese utility model patent with authorization announcement number CN216447205U and authorization announcement date May 6, 2022 discloses a torque protection system for preventing a grabber from tipping over. The torque protection system includes a hydraulic reversing valve, a driving oil cylinder and a hydraulic station. The hydraulic reversing valve is connected to the main oil circuit and the control oil circuit; the main oil circuit is provided with a pressure switch, and the control oil circuit is provided with a solenoid valve and a control handle, and the pressure switch is connected in series to the control circuit of the solenoid valve. When the grabber grabs overweight materials, the oil pressure in the main oil circuit will exceed the preset value of the pressure switch, the pressure switch will be turned on, and then the solenoid valve will be disconnected to cut off the control oil circuit, so that the control oil circuit can no longer control the extension of the driving oil cylinder, thereby preventing the grabber from tipping over due to overload operation.

[0004] The above technical solution needs to connect the pressure switch to the main oil circuit, which increases the number of interfaces on the main oil circuit, affects the sealing of the main oil circuit, and increases the risk of hydraulic oil leakage in the main oil circuit. In addition to the grab weight at the front end, the risk of tipping over of the lifting machinery is also affected by its counterweight and the flatness of the ground. Specifically, if the counterweight of the lifting machinery is too light, its center of gravity will move forward when it is unloaded, and the risk of tipping over of the lifting equipment will be greater under the same grab weight; if the counterweight is too heavy, the center of gravity of the lifting equipment will move backward, increasing the risk of the lifting machinery tipping over backward. If there is a slight tilt on the ground at the work site, it will also increase the risk of tipping over of the lifting machinery. The above technical solution only focuses on the impact of the grab weight at the front end of the lifting machinery on the oil pressure and reflects the tipping risk through the oil pressure, and cannot accurately reflect the tipping risk of the lifting machinery. Utility Model Content

[0005] One of the purposes of the utility model is to provide an anti-tilt system for lifting machinery to solve the technical problems in the prior art that the pressure switch needs to be connected to the main oil circuit, resulting in a high risk of hydraulic oil leakage in the main oil circuit and poor accuracy in reflecting the risk of tipping of the lifting machinery through the oil pressure in the main oil circuit.

[0006] Another object of the utility model is to provide a lifting machinery to solve the above technical problems.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the anti-tilt system of the lifting machinery provided by the utility model is:

[0008] A lifting machinery anti-tilt system comprises a reversing valve, a driving cylinder, a pilot handle and a solenoid valve, wherein the driving cylinder and the pilot handle are connected to the reversing valve via an oil circuit, and the solenoid valve is connected in the oil circuit between the pilot handle and the reversing valve. The lifting machinery anti-tilt system also comprises an inclination sensor or an inclination switch installed on a vehicle body and / or chassis to detect the inclination angle of the vehicle body and / or chassis, and the inclination sensor or the inclination switch is connected in a control circuit of the solenoid valve to control the solenoid valve to disconnect when the detected inclination angle exceeds a predetermined value.

[0009] The beneficial effect is that the above technical scheme is a further improvement on the prior art. When the lifting machinery grabs a lot of materials or the grab bucket is too far from the chassis horizontally, so that the tilt amplitude of the lifting machinery exceeds the predetermined value, the solenoid valve will receive the switch signal of the controller or the tilt switch in the control circuit and disconnect the corresponding oil circuit. The pilot handle can no longer control the extension of the driving cylinder, and the corresponding boom or bucket rod of the lifting machinery cannot be lifted or extended. The operator needs to release a part of the materials before continuing to work. The anti-tilt system of the lifting machinery can be modified on the structure of the traditional hydraulic system of the lifting machinery, and compared with the prior art, the anti-tilt system of the lifting machinery does not need to change the main oil circuit connected to the driving cylinder, so it can ensure the sealing of the main oil circuit and reduce the risk of leakage of the hydraulic oil in the main oil circuit. In addition, the anti-tilt system of the lifting machinery directly measures the tilt angle of the main body of the lifting machinery and controls the on and off of the solenoid valve according to the tilt angle. The tilt angle of the main body of the lifting machinery can more intuitively reflect the tipping risk of the lifting machinery, including the influence of the grab weight, counterweight and ground flatness, so that the control is more accurate.

[0010] As a further improvement, the reversing valve has a first working position in which oil is allowed to flow into the rodless chamber of the driving cylinder and oil is discharged from the rod chamber, and also has a second working position in which oil is allowed to flow into the rod chamber of the driving cylinder and oil is discharged from the rodless chamber. The pilot handle is connected to a first control oil circuit for controlling the reversing valve to switch to the first working position and a second control oil circuit for controlling the reversing valve to switch to the second working position, and the solenoid valve is located on the second control oil circuit.

[0011] The beneficial effect is that when the solenoid valve is closed, the oil circuit between the pilot handle and the second working position is cut off, and the oil circuit cannot supply oil through the solenoid valve, but can return oil through the solenoid valve. At this time, the operator can control the driving cylinder to shorten but cannot extend it through the pilot handle, and correspondingly can only make the boom or bucket arm of the crane go down or retract but cannot control the boom or bucket arm of the crane to rise or extend. This can avoid risks while making it easier for operators to perform unloading operations.

[0012] As a further improvement, the inclination sensor or the inclination switch is used to be installed on the bottom side of the rear counterweight of the vehicle body.

[0013] The beneficial effects are: the tail counterweight is far from the center of gravity of the vehicle body, when the lifting machinery tilts, the tilt amplitude at this place is larger, and the measurement accuracy is stronger. In addition, the bottom side of the tail counterweight is relatively flat, with a larger installation space, which is more convenient for the installation of the inclination sensor.

[0014] As a further improvement, the predetermined value is 1°-5°.

[0015] The beneficial effect is that the above technical solution provides a safer selection range for the predetermined value.

[0016] In order to achieve the above-mentioned purpose, the technical solution of the lifting machinery provided by the utility model is:

[0017] A lifting machinery comprises a body, a chassis and an anti-tilt system of the lifting machinery, wherein the anti-tilt system of the lifting machinery comprises a reversing valve, a driving cylinder, a pilot handle and a solenoid valve, wherein the driving cylinder and the pilot handle are connected to the reversing valve through an oil circuit, and the solenoid valve is connected in the oil circuit between the pilot handle and the reversing valve, and the anti-tilt system of the lifting machinery also comprises an inclination sensor or an inclination switch installed on the body and / or the chassis to detect the inclination angle of the body and / or the chassis, and the inclination sensor or the inclination switch is connected in the control circuit of the solenoid valve to control the solenoid valve to be disconnected when the detected inclination angle exceeds a predetermined value.

[0018] The beneficial effect is that the above technical scheme is a further improvement on the prior art. When the lifting machinery grabs a lot of materials or the grab bucket is too far from the chassis horizontally, so that the tilt amplitude of the lifting machinery exceeds the predetermined value, the solenoid valve will receive the switch signal of the controller or the tilt switch in the control circuit and disconnect the corresponding oil circuit. The pilot handle can no longer control the extension of the driving cylinder, and the corresponding boom or bucket rod of the lifting machinery cannot be lifted or extended. The operator needs to release a part of the materials before continuing to work. The anti-tilt system of the lifting machinery can be modified on the structure of the traditional hydraulic system of the lifting machinery, and compared with the prior art, the anti-tilt system of the lifting machinery does not need to change the main oil circuit connected to the driving cylinder, so it can ensure the sealing of the main oil circuit and reduce the risk of leakage of the hydraulic oil in the main oil circuit. In addition, the anti-tilt system of the lifting machinery directly measures the tilt angle of the main body of the lifting machinery and controls the on and off of the solenoid valve according to the tilt angle. The tilt angle of the main body of the lifting machinery can more intuitively reflect the tipping risk of the lifting machinery, including the influence of the grab weight, counterweight and ground flatness, so that the control is more accurate.

[0019] As a further improvement, the reversing valve has a first working position in which oil is allowed to flow into the rodless chamber of the driving cylinder and oil is discharged from the rod chamber, and also has a second working position in which oil is allowed to flow into the rod chamber of the driving cylinder and oil is discharged from the rodless chamber. The pilot handle is connected to a first control oil circuit for controlling the reversing valve to switch to the first working position and a second control oil circuit for controlling the reversing valve to switch to the second working position, and the solenoid valve is located on the second control oil circuit.

[0020] The beneficial effect is that when the solenoid valve is closed, the oil circuit between the pilot handle and the second working position is cut off, and the oil circuit cannot supply oil through the solenoid valve, but can return oil through the solenoid valve. At this time, the operator can control the driving cylinder to shorten but cannot extend it through the pilot handle, and correspondingly can only make the boom or bucket arm of the crane go down or retract but cannot control the boom or bucket arm of the crane to rise or extend. This can avoid risks while making it easier for operators to perform unloading operations.

[0021] As a further improvement, the inclination sensor or the inclination switch is installed on the bottom side of the rear counterweight of the vehicle body.

[0022] The beneficial effects are: the tail counterweight is far from the center of gravity of the vehicle body, when the lifting machinery tilts, the tilt amplitude at this place is larger, and the measurement accuracy is stronger. In addition, the bottom side of the tail counterweight is relatively flat, with a larger installation space, which is more convenient for the installation of the inclination sensor.

[0023] As a further improvement, the predetermined value is 1°-5°.

[0024] The beneficial effect is that the above technical solution provides a safer selection range for the predetermined value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the main body of the lifting machinery in the utility model;

[0026] Figure 2 It is the principle diagram of the anti-tilt system of the lifting machinery in the utility model;

[0027] Figure 3 It is a schematic diagram of the structural structure of the anti-tilt system of the lifting machinery in the utility model (showing the form of the valve group).

[0028] Description of reference numerals:

[0029] 1. Chassis; 2. Vehicle body; 3. Boom; 4. Boom drive cylinder; 5. Arm; 6. Arm drive cylinder; 7. Grab; 8. Grab drive cylinder; 9. Tilt sensor; 10. Multi-way main reversing valve; 11. Boom pilot handle; 12. Arm pilot handle; 13. Boom solenoid valve; 14. Arm solenoid valve; 15. Pilot pump; 16. Main pump; 17. Fuel tank; 18. Boom reversing valve; 19. Arm reversing valve. DETAILED DESCRIPTION

[0030] The lifting machinery of the present utility model is further described in detail below in conjunction with the embodiments.

[0031] The lifting machinery in the utility model includes a lifting machinery main body and a lifting machinery anti-tilt system. The lifting machinery anti-tilt system includes a hydraulic station and at least one action unit connected to the hydraulic station. The action unit includes a reversing valve, a driving cylinder, a pilot handle and a solenoid valve. The driving cylinder and the pilot handle are connected to the reversing valve through an oil circuit. The solenoid valve and the pilot handle are connected in series in the oil circuit. The lifting machinery anti-tilt system also includes an inclination sensor installed on the lifting machinery main body. The inclination sensor is electrically connected to the solenoid valve and is used to control the solenoid valve to disconnect when the inclination angle of the lifting machinery main body exceeds a predetermined value.

[0032] When the crane grabs a lot of materials or the grab bucket is too far from the chassis horizontally, causing the crane to tilt more than the preset value, the solenoid valve will receive the switch signal of the controller or the tilt switch in the control circuit and disconnect the corresponding oil circuit. The pilot handle can no longer control the extension of the drive cylinder, and the corresponding boom or dipper arm of the crane cannot be lifted or extended. The operator needs to release part of the materials before continuing to work. The crane anti-tilt system can be modified on the traditional crane hydraulic system structure, and compared with the prior art, the crane anti-tilt system does not need to change the main oil circuit connected to the drive cylinder, so it can ensure the sealing of the main oil circuit and reduce the risk of hydraulic oil leakage in the main oil circuit. In addition, the crane anti-tilt system directly measures the tilt angle of the crane body and controls the on and off of the solenoid valve according to the tilt angle. The tilt angle of the crane body can more intuitively reflect the risk of tipping over of the crane, including the influence of the grab weight, counterweight and ground flatness, making the control more accurate.

[0033] Specific embodiment 1 of the lifting machinery provided by the utility model:

[0034] See attached Figure 1 In one implementation of this embodiment, the lifting machine is a material grabber, including a chassis 1, a vehicle body 2, a boom 3, a boom drive cylinder 4, a bucket 5, a bucket drive cylinder 6, a grab 7 and a grab drive cylinder 8. The above structure is prior art and will not be described in detail here.

[0035] The grabber also includes a lifting mechanical anti-tilt system, see attached Figure 2 and attached Figure 3The anti-tilt system of the lifting machinery includes a hydraulic station for oil supply, a tilt sensor 9, a boom reversing valve 18, a boom drive cylinder 4, a boom pilot handle 11, a boom solenoid valve 13, and a bucket rod reversing valve 19, a bucket rod drive cylinder 6, a bucket rod pilot handle 12, and a bucket rod solenoid valve 14. The hydraulic station includes a pilot pump 15, a main pump 16, and an oil tank 17. The boom drive cylinder 4 is used to drive the boom 3 to move, and the boom reversing valve 18, the boom pilot handle 11, and the boom solenoid valve 13 are used to control the boom drive cylinder 4; the bucket rod drive cylinder 6 is used to drive the bucket rod 5 to move, and the bucket rod reversing valve 19, the bucket rod pilot handle 12, and the bucket rod solenoid valve 14 are used to control the bucket rod drive cylinder 6.

[0036] The boom driving oil cylinder 4 and the boom pilot handle 11 are both connected to the boom reversing valve 18 through an oil circuit, and the boom solenoid valve 13 is connected in the oil circuit between the boom pilot handle 11 and the boom reversing valve 18. The boom reversing valve 18 has a first working position for oil entering the rodless chamber of the boom driving oil cylinder 4 and oil draining from the rod chamber, and also has a second working position for oil entering the rod chamber of the boom driving oil cylinder 4 and oil draining from the rodless chamber. The boom pilot handle 11 is connected to a first control oil circuit for controlling the boom reversing valve 18 to switch to the first working position and a second control oil circuit for controlling the boom reversing valve 18 to switch to the second working position, and the boom solenoid valve 13 is located on the second control oil circuit. The connection relationship between the boom reversing valve 19, the boom driving cylinder 6, the boom pilot handle 12, and the boom solenoid valve 14 is the same as the connection relationship between the boom reversing valve 18, the boom driving cylinder 4, the boom pilot handle 11, and the boom solenoid valve 13, and will not be repeated here.

[0037] The arm reversing valve 19 and the boom reversing valve 18 are formed by two of the multi-way main reversing valve 10. In other embodiments, the arm reversing valve 19 and the boom reversing valve 18 may also be formed by independent three-position four-way reversing valves.

[0038] The boom solenoid valve 13 and the arm solenoid valve 14 are two-position three-way solenoid valves. When the boom solenoid valve 13 is in the open state, the corresponding oil circuit is connected, and the hydraulic oil can flow from the boom pilot handle 11 to the second working position, and vice versa; when the boom solenoid valve 13 is in the closed state, the corresponding oil circuit is cut off, and the hydraulic oil cannot flow from the boom pilot handle 11 to the second working position, but can return oil to the hydraulic station from the second working position. The working principle of the arm solenoid valve 14 is the same as that of the boom solenoid valve 13, which will not be repeated here.

[0039] The inclination sensor 9 is connected to the control circuit of the boom solenoid valve 13 and the arm solenoid valve 14. The inclination sensor 9 is installed on the bottom side of the tail counterweight of the material grabber body 2 to monitor the inclination angle of the body 2 in real time. The tail counterweight is far from the center of gravity of the material grabber. When the material grabber tilts, the inclination amplitude at this place is large, and the measurement accuracy is stronger. In addition, the bottom side of the tail counterweight is relatively flat, with a larger installation space, which is more convenient for the installation of the inclination sensor 9.

[0040] In other embodiments, the inclination sensor 9 may also be installed at other positions of the vehicle body 2 or on the chassis 1 .

[0041] There is a controller in the control circuit of the boom solenoid valve 13 and the arm solenoid valve 14. The controller can receive the electrical signal sent by the tilt sensor 9, obtain the deflection angle value of the vehicle body 2 after processing, and compare it with the preset value in the controller. When the deflection angle of the vehicle body 2 exceeds the preset value, the controller controls the boom solenoid valve 13 and the arm solenoid valve 14 to close. The range of the preset value is 1°-5°, and 3° is preferred in this embodiment. In actual use, the preset value can be selected according to the state of the working ground and the type of lifting machinery.

[0042] When the boom solenoid valve 13 is closed, the oil circuit between the boom pilot handle 11 and the second working position is cut off, and the hydraulic oil cannot flow from the boom pilot handle 11 to the second working position, but can return oil from the second working position to the hydraulic station. At this time, the operator can control the boom 3 to descend through the boom pilot handle 11 but cannot control the boom 3 to rise. Similarly, after the arm solenoid valve 14 is closed, the operator can control the arm 5 to retract through the arm pilot handle 12 but cannot control the arm 5 to extend. At this time, the operator needs to reduce the amount of material to be grabbed to ensure the safety of the lifting machinery. This can avoid risks while facilitating the operator to perform unloading operations.

[0043] In other embodiments, two boom solenoid valves 13 are provided, which are respectively provided in the oil path between the boom pilot handle 11 and the first working position and the second working position. Two arm solenoid valves 14 are also provided, and the setting method is the same as that of the boom solenoid valves 13. In this embodiment, once the tilt angle of the lifting machine exceeds the predetermined value, the boom 3 and the arm 5 cannot move, and a part of the material needs to be released immediately.

[0044] In other embodiments, if the structure of the lifting machinery is relatively simple, for example, the pipelayer does not have a boom 5 structure, then the corresponding structure may only have a boom reversing valve 18, a boom drive cylinder 4, a boom pilot handle 11, and a boom solenoid valve 13, without providing a boom reversing valve 19, a boom drive cylinder 6, a boom pilot handle 12, and a boom solenoid valve 14.

[0045] In other embodiments, the lifting machinery may also be an excavator, a forklift, etc.

[0046] Specific embodiment 2 of the lifting machinery provided by the utility model:

[0047] In one implementation of this embodiment, the lifting machine is a material grabber, including a chassis, a body, a boom, a boom drive cylinder, a bucket, a bucket drive cylinder, a grab bucket, and a grab bucket drive cylinder. The above structure is prior art and will not be described in detail here.

[0048] The material grabber also includes a lifting machinery anti-tilt system, which includes a hydraulic station, a tilt switch, a boom reversing valve, a boom driving oil cylinder, a boom pilot handle, a boom solenoid valve, and a bucket rod reversing valve, a bucket rod driving oil cylinder, a bucket rod pilot handle, and a bucket rod solenoid valve. The arrangement of the hydraulic station, the boom reversing valve, the boom driving oil cylinder, the boom pilot handle, the boom solenoid valve, the bucket rod reversing valve, the bucket rod driving oil cylinder, the bucket rod pilot handle, and the bucket rod solenoid valve is shown in Example 1.

[0049] In this embodiment, the tilt switch is also installed on the bottom side of the tail counterweight of the material grabber body, and the tilt switch is connected in series in the control circuit of the boom solenoid valve and the bucket arm solenoid valve. When the tilt switch detects that the tilt angle of the body exceeds the preset value, it outputs a switch signal to close the boom solenoid valve and the bucket arm solenoid valve, so there is no need to set a separate controller in the control circuit.

[0050] The anti-tilt system of the lifting machinery in the utility model is further described in detail below in conjunction with the embodiments.

[0051] The specific embodiment of the anti-tilt system of the lifting machinery provided by the utility model is as follows:

[0052] The anti-tilt system of the lifting machinery is the mechanical anti-tilt system in lifting machinery embodiment 1 or 2, which will not be described in detail here.

[0053] 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 lifting machinery anti-tilt system, comprising a reversing valve, a driving oil cylinder, a pilot handle and a solenoid valve, wherein the driving oil cylinder and the pilot handle are connected to the reversing valve through an oil circuit, and the solenoid valve is connected to the oil circuit between the pilot handle and the reversing valve, wherein: The anti-tilt system of the lifting machinery also includes a tilt sensor or a tilt switch installed on the vehicle body and / or chassis to detect the tilt angle of the vehicle body and / or chassis. The tilt sensor or the tilt switch is connected in the control circuit of the solenoid valve to control the solenoid valve to disconnect when the detected tilt angle exceeds a predetermined value.

2. The anti-tilt system for lifting machinery according to claim 1 is characterized in that: The reversing valve has a first working position in which oil is allowed to flow into the rodless chamber of the driving cylinder and oil is discharged from the rod chamber. It also has a second working position in which oil is allowed to flow into the rod chamber of the driving cylinder and oil is discharged from the rodless chamber. The pilot handle is connected to a first control oil circuit for controlling the reversing valve to switch to the first working position and a second control oil circuit for controlling the reversing valve to switch to the second working position. The solenoid valve is located on the second control oil circuit.

3. The anti-tilt system for lifting machinery according to claim 1 or 2, characterized in that: The tilt sensor or tilt switch is used to be installed on the bottom side of the rear counterweight of the vehicle body.

4. The anti-tilt system for lifting machinery according to claim 1 or 2, characterized in that: The predetermined value is 1°-5°.

5. A lifting machinery, comprising a body, a chassis and an anti-tilt system of the lifting machinery, wherein the anti-tilt system of the lifting machinery comprises a reversing valve, a driving oil cylinder, a pilot handle and a solenoid valve, wherein the driving oil cylinder and the pilot handle are connected to the reversing valve through an oil circuit, and the solenoid valve is connected to the oil circuit between the pilot handle and the reversing valve, wherein: The anti-tilt system of the lifting machinery also includes a tilt sensor or tilt switch installed on the body and / or chassis to detect the tilt angle of the body and / or chassis. The tilt sensor or tilt switch is connected in the control circuit of the solenoid valve to control the solenoid valve to disconnect when the detected tilt angle exceeds a predetermined value.

6. The lifting machine according to claim 5, characterized in that: The reversing valve has a first working position in which oil is allowed to flow into the rodless chamber of the driving cylinder and oil is discharged from the rod chamber. It also has a second working position in which oil is allowed to flow into the rod chamber of the driving cylinder and oil is discharged from the rodless chamber. The pilot handle is connected to a first control oil circuit for controlling the reversing valve to switch to the first working position and a second control oil circuit for controlling the reversing valve to switch to the second working position. The solenoid valve is located on the second control oil circuit.

7. The lifting machine according to claim 5 or 6, characterized in that: The tilt sensor or tilt switch is installed on the bottom side of the rear counterweight of the vehicle body.

8. The lifting machine according to claim 5 or 6, characterized in that: The predetermined value is 1°-5°.

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