Anti-misoperation interlocking system of overhead working truck

Abstract

The utility model relates to an anti-misoperation interlocking system of an overhead working truck, and belongs to the technical field of overhead working truck control. Comprising a getting-on and getting-off oil way switching electromagnetic valve, a port P of the getting-on and getting-off oil way switching electromagnetic valve is communicated with an oil outlet of a gear pump, an oil inlet of the gear pump is connected to an oil tank, and a port A and a port B of the getting-on and getting-off oil way switching electromagnetic valve are connected with a first control oil way and a second control oil way respectively. Oil is supplied to the first control loop or the second control loop, the lower vehicle valve group and the upper vehicle valve group are installed on the first control oil way and the second control oil way respectively, and an oil return opening of the first control oil way and an oil return opening of the second control oil way are connected to an oil tank. The hydraulic system has the advantages that the getting-off valve group is switched into getting-on operation, hydraulic oil directly flows to the getting-on valve group through the getting-on and getting-off oil way switching electromagnetic valve and then returns to the oil tank through the oil return pipe, getting-off operation does not act after manual reversing, the uniqueness of getting-on operation is guaranteed, and safety is guaranteed.

Description

Technical Field

[0001] The utility model relates to an anti-misoperation interlocking system for an aerial work vehicle, belonging to the technical field of aerial work vehicle control. Background Art

[0002] Aerial work platforms are generally used for both dismounting and mounting operations. Dismounting refers to extending and retracting the outriggers, while mounting refers to raising, lowering, extending, retracting, and rotating the boom. Aerial work platforms require people to operate at high altitudes, so they require high stability to prevent accidents caused by tipping.

[0003] A Chinese invention, publication number CN105288909A, discloses an automatic interlocking device for boarding and disembarking fire trucks with dual protection. The device utilizes a hydraulic pilot unloading valve assembly, a mechanical interlocking limit plate, a self-resetting cylinder, a sensor, and other components to achieve automatic interlocking for boarding and disembarking. However, this solution presents challenges such as complex design, high manufacturing costs, and assembly difficulties. Furthermore, if the disembarkation outrigger fails, not only is the armrest unable to move and the outriggers unable to retract, but the outriggers also become unable to extend to maintain stability. This renders all movements of the armrest and outriggers inoperable, posing a significant risk to on-site rescue efforts.

[0004] The current technical considerations are not comprehensive and have the following disadvantages: if there are people working on the aerial work vehicle working platform, if someone makes a mistake and performs other operations, it will seriously affect the life safety of the staff.

[0005] In order to solve one of the above problems, an anti-misoperation interlocking system for an aerial work vehicle is urgently needed. Utility Model Content

[0006] In view of the above deficiencies in the existing technology, the technical problem to be solved by the present invention is: how to achieve that only after the upper operation is completed, the boom falls into place, the proximity switch transmits a signal, the electromagnetic reversing valve is powered off, and the vehicle can be operated and the leg retracting operation is performed to ensure safety. For this purpose, an anti-misoperation interlock system for aerial work vehicles is provided.

[0007] The anti-misoperation interlocking system for aerial work vehicles described in the present utility model includes a disembarkation valve group and a boarding valve group, and is characterized in that it includes an on-and-off oil circuit switching solenoid valve, the P port of the on-and-off oil circuit switching solenoid valve is connected to the oil outlet of the gear pump, the oil inlet of the gear pump is connected to the oil tank, the A port and the B port of the on-and-off oil circuit switching solenoid valve are respectively connected to the first control oil circuit and the second control oil circuit, and oil is supplied to the first control oil circuit or the second control oil circuit, the disembarkation valve group and the boarding valve group are respectively installed on the first control oil circuit and the second control oil circuit, and the return oil ports of the first control oil circuit and the second control oil circuit are connected to the oil tank.

[0008] Preferably, the upper valve group includes a motor control valve, a leveling cylinder control valve, a boom cylinder control valve, and a boom cylinder control valve installed on the second control oil circuit. The two working oil ports of the motor control valve are respectively connected to the oil inlet and oil outlet of the slewing mechanism motor, the two working oil ports of the leveling cylinder control valve are respectively connected to the rodless chamber and the rod chamber of the leveling cylinder, the two working oil ports of the boom cylinder control valve are respectively connected to the rodless chamber and the rod chamber of the boom cylinder, and the two working oil ports of the boom cylinder control valve are respectively connected to the rodless chamber and the rod chamber of the boom cylinder.

[0009] Preferably, a boom return-in-place proximity switch is installed on the boom oil cylinder, and the boom return-in-place proximity switch and the on-and-off oil circuit switching solenoid valve are electrically connected to the signal input end and the signal output end of the controller respectively.

[0010] Only when the getting-on-car operation is completed, the boom is controlled to fall back into place, the proximity switch that triggers the boom to fall back into place transmits a signal, and the solenoid valve switching the oil circuit for getting-on-car is de-energized and reversed, can the getting-off-car operation be performed and the leg retraction operation be performed.

[0011] Preferably, the motor control valve, leveling cylinder control valve, luffing cylinder control valve and boom cylinder control valve are all electro-hydraulic proportional valves.

[0012] Preferably, the on-and-off oil circuit switching solenoid valve is a two-position three-way solenoid valve.

[0013] Preferably, the dismounting valve group includes a first control valve, a second control valve, a third control valve, and a fourth control valve installed on the first control oil circuit. The two working oil ports of the first control valve are respectively connected to the rodless chambers of the left front vertical cylinder and the left front horizontal cylinder. The two working oil ports of the second control valve are respectively connected to the rodless chambers of the left rear vertical cylinder and the left rear horizontal cylinder. The two working oil ports of the third control valve are respectively connected to the rodless chambers of the right front vertical cylinder and the right front horizontal cylinder. The two working oil ports of the fourth control valve are respectively connected to the rodless chambers of the right rear vertical cylinder and the right rear horizontal cylinder. To perform leg extension and retraction operations.

[0014] Preferably, a one-way valve is also installed on the first control oil circuit.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The anti-misoperation interlock system for aerial work vehicles described in the utility model is equipped with an on-and-off oil circuit switching solenoid valve between the gear pump and the getting-off valve group. Under normal circumstances, the hydraulic oil returns to the oil tank directly after passing through the getting-off valve group to complete the leg extension action. Then the on-and-off oil circuit switching solenoid valve is controlled to be powered on, and the getting-off valve group is switched to the getting-on operation. The hydraulic oil passes through the on-and-off oil circuit switching solenoid valve directly to the getting-on valve group and then returns to the oil tank through the return oil pipe. After manual reversing, the getting-off operation does not take place, thereby ensuring the uniqueness of the getting-on operation and ensuring safety.

[0017] The anti-misoperation interlock system for the aerial work vehicle described in the utility model can only be operated after the upper operation is completed, the boom falls into place, the proximity switch transmits a signal, and the electromagnetic reversing valve is powered off, and the lowering operation and leg retraction operation are performed, thereby ensuring safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] In the figure: 1, fuel tank 2, gear pump 3, on-and-off oil circuit switching solenoid valve 4, one-way valve 5, off-vehicle valve group 6, on-vehicle valve group 7, motor control valve 8, leveling cylinder control valve 9, luffing cylinder control valve 10, boom cylinder control valve 11, slewing mechanism motor 12, leveling cylinder 13, luffing cylinder 14, boom cylinder 15, boom return to position proximity switch 16, left front vertical cylinder 17, left front horizontal cylinder 18, left rear vertical cylinder 19, left rear horizontal cylinder 20, right front vertical cylinder 21, right front horizontal cylinder 22, right rear vertical cylinder 23, right rear horizontal cylinder. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings: The present invention will be further illustrated below through specific embodiments, but it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0022] Example 1, as Figure 1As shown, the anti-misoperation interlocking system for aerial work vehicles includes a disembarkation valve group 5 and a boarding valve group 6, including an on-board oil circuit switching solenoid valve 3, the P port of the on-board oil circuit switching solenoid valve 3 is connected to the oil outlet of the gear pump 2, the oil inlet of the gear pump 2 is connected to the oil tank 1, the A port and the B port of the on-board oil circuit switching solenoid valve 3 are respectively connected to the first control oil circuit and the second control oil circuit, supplying oil to the first control oil circuit or the second control oil circuit, the disembarkation valve group 5 and the boarding valve group 6 are respectively installed on the first control oil circuit and the second control oil circuit, and the return oil ports of the first control oil circuit and the second control oil circuit are connected to the oil tank 1.

[0023] A solenoid valve 3 for switching the oil circuits for getting on and off the vehicle is installed between the gear pump 2 and the disembarkation valve assembly 5. Under normal circumstances, the hydraulic oil returns directly to the fuel tank after passing through the disembarkation valve assembly 5, completing the leg extension operation. The solenoid valve 3 is then energized, and the disembarkation valve assembly 5 switches to the vehicle boarding operation. The hydraulic oil passes directly through the solenoid valve 3 to the vehicle boarding valve assembly 6 and then returns to the fuel tank through the return oil pipe. After manual reversal, the disembarkation operation is inactive, ensuring the uniqueness and safety of the vehicle boarding operation. Only after the disembarkation operation is completed, the boom is in place, and the proximity switch receives a signal, the solenoid reversing valve is de-energized, and the disembarkation operation can be performed, allowing the leg retraction operation to proceed. If there are people working on the aerial work platform, if someone makes a mistake and performs other operations, it can seriously affect the life and safety of the staff.

[0024] Example 2, as Figure 1 As shown, the anti-misoperation interlocking system for aerial work vehicles includes a disembarkation valve group 5 and a boarding valve group 6, including an on-board oil circuit switching solenoid valve 3, the P port of the on-board oil circuit switching solenoid valve 3 is connected to the oil outlet of the gear pump 2, the oil inlet of the gear pump 2 is connected to the oil tank 1, the A port and the B port of the on-board oil circuit switching solenoid valve 3 are respectively connected to the first control oil circuit and the second control oil circuit, supplying oil to the first control oil circuit or the second control oil circuit, the disembarkation valve group 5 and the boarding valve group 6 are respectively installed on the first control oil circuit and the second control oil circuit, and the return oil ports of the first control oil circuit and the second control oil circuit are connected to the oil tank 1.

[0025] Furthermore, the upper valve group 6 includes a motor control valve 7, a leveling cylinder control valve 8, a boom cylinder control valve 9, and a boom cylinder control valve 10 installed on the second control oil circuit. The two working oil ports of the motor control valve 7 are respectively connected to the oil inlet and oil outlet of the slewing mechanism motor 11, the two working oil ports of the leveling cylinder control valve 8 are respectively connected to the rodless chamber and the rod chamber of the leveling cylinder 12, the two working oil ports of the boom cylinder control valve 9 are respectively connected to the rodless chamber and the rod chamber of the boom cylinder 13, and the two working oil ports of the boom cylinder control valve 10 are respectively connected to the rodless chamber and the rod chamber of the boom cylinder 14.

[0026] Furthermore, a boom return-in-place proximity switch 15 is installed on the boom oil cylinder 14 , and the boom return-in-place proximity switch 15 and the vehicle getting on and off oil circuit switching solenoid valve 3 are electrically connected to the signal input terminal and the signal output terminal of the controller respectively.

[0027] Only when the getting-on operation is completed, the boom is controlled to fall back into place, and the boom-falling-in-place proximity switch 15 is triggered to transmit a signal, the getting-on-and-off oil circuit switching solenoid valve 3 is de-energized and reversed, can the getting-off operation be performed and the leg retraction operation be performed.

[0028] Furthermore, the motor control valve 7 , the leveling cylinder control valve 8 , the luffing cylinder control valve 9 and the boom cylinder control valve 10 are all electro-hydraulic proportional valves.

[0029] Furthermore, the on-and-off oil circuit switching solenoid valve 3 is a two-position three-way solenoid valve.

[0030] Furthermore, the dismounting valve group 5 includes a first control valve, a second control valve, a third control valve, and a fourth control valve installed on the first control oil circuit. The two working oil ports of the first control valve are respectively connected to the rodless chambers of the left front vertical cylinder 16 and the left front horizontal cylinder 17. The two working oil ports of the second control valve are respectively connected to the rodless chambers of the left rear vertical cylinder 18 and the left rear horizontal cylinder 19. The two working oil ports of the third control valve are respectively connected to the rodless chambers of the right front vertical cylinder 20 and the right front horizontal cylinder 21. The two working oil ports of the fourth control valve are respectively connected to the rodless chambers of the right rear vertical cylinder 22 and the right rear horizontal cylinder 23. To perform leg extension and retraction operations.

[0031] Furthermore, a one-way valve 4 is installed on the first control oil circuit.

[0032] The anti-misoperation interlock system for aerial work vehicles described in the present invention has an on-and-off oil circuit switching solenoid valve installed between the gear pump and the disembarkation valve group. Under normal circumstances, the hydraulic oil returns directly to the oil tank after passing through the disembarkation valve group to complete the leg extension operation. Then, the on-and-off oil circuit switching solenoid valve is controlled to be powered on, and the disembarkation valve group is switched to the on-board operation. The hydraulic oil passes directly to the on-and-off oil circuit switching solenoid valve and then returns to the oil tank through the return oil pipe. After manual reversing, the disembarkation operation does not take place, ensuring the uniqueness of the on-board operation and ensuring safety. Only after the on-board operation is completed, the boom falls into place, and the proximity switch transmits a signal, the solenoid reversing valve is powered off, and the disembarkation operation can be performed to retract the legs. If there is someone working on the aerial work vehicle working platform, if someone makes a mistake and performs other operations, it will seriously affect the life safety of the staff.

[0033] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

[0034] Any matters not described in detail in the present invention are well-known technologies to those skilled in the art.

Claims

1. An anti-misoperation interlock system for an aerial work vehicle, comprising a disembarkation valve group (5) and an onboard valve group (6), characterized in that: The invention comprises an on-board oil circuit switching solenoid valve (3), wherein the P port of the on-board oil circuit switching solenoid valve (3) is connected to the oil outlet of the gear pump (2), the oil inlet of the gear pump (2) is connected to the oil tank (1), the A port and the B port of the on-board oil circuit switching solenoid valve (3) are respectively connected to the first control oil circuit and the second control oil circuit, and oil is supplied to the first control oil circuit or the second control oil circuit, the disembarkation valve group (5) and the on-board valve group (6) are respectively installed on the first control oil circuit and the second control oil circuit, and the oil return ports of the first control oil circuit and the second control oil circuit are connected to the oil tank (1).

2. The anti-misoperation interlock system for aerial work vehicles according to claim 1, characterized in that: The vehicle valve group (6) includes a motor control valve (7), a leveling cylinder control valve (8), a boom cylinder control valve (9), and a boom cylinder control valve (10) installed on the second control oil circuit. The two working oil ports of the motor control valve (7) are respectively connected to the oil inlet and the oil outlet of the slewing mechanism motor (11). The two working oil ports of the leveling cylinder control valve (8) are respectively connected to the rodless cavity and the rod cavity of the leveling cylinder (12). The two working oil ports of the boom cylinder control valve (9) are respectively connected to the rodless cavity and the rod cavity of the boom cylinder (13). The two working oil ports of the boom cylinder control valve (10) are respectively connected to the rodless cavity and the rod cavity of the boom cylinder (14).

3. The anti-misoperation interlock system for aerial work vehicles according to claim 2, characterized in that: The boom oil cylinder (14) is provided with a boom return-to-position proximity switch (15), and the boom return-to-position proximity switch (15) and the vehicle on / off oil circuit switching solenoid valve (3) are electrically connected to the signal input terminal and the signal output terminal of the controller, respectively.

4. The anti-misoperation interlock system for aerial work vehicles according to claim 3, characterized in that: The motor control valve (7), the leveling cylinder control valve (8), the boom cylinder control valve (9) and the boom cylinder control valve (10) are all electro-hydraulic proportional valves.

5. The anti-misoperation interlock system for aerial work vehicles according to claim 4, characterized in that: The on-and-off oil circuit switching solenoid valve (3) is a two-position three-way solenoid valve.

6. The anti-misoperation interlock system for aerial work vehicles according to claim 5, characterized in that: The dismounting valve group (5) includes a first control valve, a second control valve, a third control valve and a fourth control valve installed on the first control oil circuit, the two working oil ports of the first control valve are respectively connected to the rodless chambers of the left front vertical oil cylinder (16) and the left front horizontal oil cylinder (17), the two working oil ports of the second control valve are respectively connected to the rodless chambers of the left rear vertical oil cylinder (18) and the left rear horizontal oil cylinder (19), the two working oil ports of the third control valve are respectively connected to the rodless chambers of the right front vertical oil cylinder (20) and the right front horizontal oil cylinder (21), and the two working oil ports of the fourth control valve are respectively connected to the rodless chambers of the right rear vertical oil cylinder (22) and the right rear horizontal oil cylinder (23).

7. The anti-misoperation interlock system for aerial work vehicles according to claim 6, characterized in that: A one-way valve (4) is also installed on the first control oil circuit.

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