Hydraulic leveling system for hanging basket of lorry-mounted crane

Abstract

The utility model discloses a hydraulic leveling system for a hanging basket of a lorry-mounted crane in the field of aloft work of the lorry-mounted crane. The hydraulic leveling system comprises a multi-way valve, a ball valve I, a ball valve II, a safety valve I, a safety valve II, a leveling cylinder I, a leveling cylinder II and a bidirectional balance valve, the multi-way valve is connected with the first ball valve and the second ball valve. The first safety valve is connected with the first ball valve, and the second safety valve is connected with the second ball valve. A large cavity of the first leveling cylinder is connected with a first safety valve, and a small cavity of the first leveling cylinder is connected with a second safety valve. The first safety valve and the second safety valve are both connected with the two-way balance valve, and the large cavity and the small cavity of the second leveling cylinder are also connected with the two-way balance valve. According to the utility model, the system is protected, the phenomena of unbalance and shaking during high-altitude operation are avoided, the safety and reliability are high, and the load leveling capacity is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-altitude operation of truck-mounted cranes, and particularly relates to a hydraulic leveling system equipped with a hanging basket of a truck-mounted crane. Background Art

[0002] In the existing technology, most truck-mounted cranes on the market currently use a boom-mounted hanging basket device, which uses mechanical and hydraulic leveling methods based on the change in gravity on the hanging basket. Its mechanical structure is relatively complex, with many rigid connection points and parts, and its own weight is relatively large. In addition, it only relies on an independent leveling cylinder without a hydraulic leveling system control, and the stability and safety of aerial operations cannot be reliably guaranteed. Utility Model Content

[0003] The purpose of the utility model is to provide a hydraulic leveling system for a truck crane equipped with a hanging basket, which not only protects the system but also avoids imbalance and shaking during high-altitude operations, and has high safety and reliability and a large leveling load capacity.

[0004] The purpose of the utility model is achieved as follows: a hydraulic leveling system for a truck-mounted crane equipped with a hanging basket, comprising a multi-way valve, a ball valve 1, a ball valve 2, a safety valve 1, a safety valve 2, a leveling cylinder 1, a leveling cylinder 2 and a two-way balancing valve; the multi-way valve is connected to both the ball valve 1 and the ball valve 2; the safety valve 1 is connected to the ball valve 1, and the safety valve 2 is connected to the ball valve 2; the large chamber of the leveling cylinder 1 is connected to the safety valve 1, and the small chamber of the leveling cylinder 1 is connected to the safety valve 2; the safety valve 1 and the safety valve 2 are both connected to the two-way balancing valve, and the large chamber and small chamber of the leveling cylinder 2 are also connected to the two-way balancing valve.

[0005] The utility model connects the large chambers of the two leveling cylinders and the small chambers to form a closed hydraulic circuit. When the boom changes its length, the first leveling cylinder extends and retracts, pressing the hydraulic oil into the second leveling cylinder. Since the cylinder diameters and rod diameters of the two leveling cylinders are exactly the same, when the first leveling cylinder extends or retracts a certain length, the second leveling cylinder retracts or extends the same length, thereby achieving self-balancing of the hanging basket. The two-way balancing valve has a set pressure of 90 bar, which ensures that the hanging basket always maintains self-balancing when its own weight and inertia change to a certain extent during aerial operations. Moreover, when the load pressure of the variable length is too large, once it exceeds the set pressure of the safety valve 1: 150 bar and the set pressure of the safety valve 2: 175 bar, the hydraulic oil of the leveling hydraulic system will overflow from the safety valve back to the hydraulic oil tank, and will not enter the first and second leveling cylinders. Compared with the existing technology, the beneficial effects of the present invention are: the hydraulic leveling device has a simple structure and light weight; the angle change of the hanging basket is compensated by changing the elevation angle of the boom, and by setting the pressure in the leveling hydraulic system, it not only protects the system, but also avoids imbalance and shaking during high-altitude operations. It has high safety and reliability and a large leveling load capacity.

[0006] As a further improvement of the utility model, the hanging basket leveling link A oil port of the multi-way valve is connected with one end of the ball valve one, the safety valve one and the safety valve two are each provided with two P oil ports and one T oil port, the other end of the ball valve one is connected with the P oil port of the safety valve one, the T oil port of the safety valve one is connected with the hydraulic oil tank, the hanging basket leveling link B oil port of the multi-way valve is connected with one end of the ball valve two, the other end of the ball valve two is connected with the P oil port of the safety valve two, and the T oil port of the safety valve two is connected with the hydraulic oil tank.

[0007] As a further improvement of the utility model, the other P oil port of the safety valve one is connected with the V1 oil port of the two-way balance valve through the bracket pipeline assembly, the other P oil port of the safety valve two is connected with the V2 oil port of the two-way balance valve through the bracket pipeline assembly, the C1 oil port and the C2 oil port of the two-way balance valve are connected with the large cavity and the small cavity of the leveling cylinder two respectively, and the large cavity and the small cavity of the leveling cylinder one are connected with the other P oil port of the safety valve one and the other P oil port of the safety valve two respectively.

[0008] As a further improvement of the utility model, the set pressure of the safety valve one is 150 bar, the set pressure of the safety valve two is 175 bar, and the set pressure of the two-way balance valve is 90 bar. The set pressure of the two-way balance valve is 90 bar, which ensures that the hanging basket always maintains self-balance when the hanging basket changes to a certain degree due to gravity and inertia during the operation in the air. Moreover, when the amplitude load pressure is too large and exceeds the set pressure of the safety valve one (150 bar) and the set pressure of the safety valve two (175 bar), the hydraulic oil of the leveling hydraulic system will overflow from the safety valve back to the hydraulic oil tank, so as not to enter the leveling cylinder one and the leveling cylinder two.

[0009] As a further improvement of the utility model, the cylinder rod of the leveling cylinder one is hinged with the rotating column, the upper end of the rotating column is hinged with the hanging arm, the cylinder barrel of the leveling cylinder one is hinged with the hanging arm, a variable amplitude cylinder is further arranged between the rotating column and the hanging arm, the cylinder barrel of the variable amplitude cylinder is hinged with the rotating column, and the cylinder rod of the variable amplitude cylinder is hinged with the hanging arm, the front end of the hanging arm is hinged with the hanging basket, the leveling cylinder two is arranged between the hanging arm and the hanging basket, the cylinder rod of the leveling cylinder two is hinged with the hanging arm, and the cylinder barrel of the leveling cylinder two is hinged with the hanging basket. The leveling cylinder one enables the rotating column and the hanging arm to maintain balance, the variable amplitude cylinder drives the hanging arm to adjust the amplitude, and the leveling cylinder two enables the hanging basket to maintain balance. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is the leveling hydraulic system control principle diagram of the utility model.

[0011] Among them, 1 multi-way valve, 2 ball valve one, 3 ball valve two, 4 safety valve one, 5 safety valve two, 6 leveling cylinder one, 7 leveling cylinder two, 8 two-way balance valve, 9 bracket pipeline assembly, 10 rotating column, 11 hanging arm, 12 hanging basket, 13 variable amplitude cylinder. DETAILED DESCRIPTION

[0012] like Figure 1 As shown, a hydraulic leveling system for a truck-mounted crane equipped with a hanging basket includes a multi-way valve 1, ball valve 12, ball valve 23, safety valve 14, safety valve 25, leveling cylinder 16, leveling cylinder 27 and a two-way balancing valve 8; the multi-way valve 1 is connected to ball valve 12 and ball valve 23; the safety valve 14 is connected to ball valve 12, and the safety valve 25 is connected to ball valve 23; the large chamber of leveling cylinder 16 is connected to safety valve 14, and the small chamber of leveling cylinder 16 is connected to safety valve 25; the safety valve 14 and safety valve 25 are both connected to the two-way balancing valve 8, and the large and small chambers of leveling cylinder 27 are also connected to the two-way balancing valve 8.

[0013] The A oil port of the leveling joint of the hanging basket 12 of the multi-way valve 1 is connected to one end of the ball valve 1-2. The safety valve 1-4 and the safety valve 2-5 are both equipped with two P oil ports and one T oil port. The other end of the ball valve 1-2 is connected to the P oil port of the safety valve 1-4. The T oil port of the safety valve 1-4 is connected to the hydraulic oil tank. The B oil port of the leveling joint of the hanging basket 12 of the multi-way valve 1 is connected to one end of the ball valve 2-3. The other end of the ball valve 2-3 is connected to the P oil port of the safety valve 2-5. The T oil port of the safety valve 2-5 is connected to the hydraulic oil tank. The other P oil port of safety valve 1 4 is connected to the V1 oil port of two-way balancing valve 8 through the bracket pipeline assembly 9. The other P oil port of safety valve 2 5 is connected to the V2 oil port of two-way balancing valve 8 through the bracket pipeline assembly 9. The C1 oil port and C2 oil port of two-way balancing valve 8 are respectively connected to the large chamber and small chamber of leveling cylinder 2 7. The large chamber and small chamber of leveling cylinder 1 6 are respectively connected to the other P oil port of safety valve 1 4 and the other P oil port of safety valve 2 5.

[0014] The set pressures of safety valve 1 (4) and safety valve 2 (5) are 150 bar, 175 bar, and 90 bar, respectively, for bidirectional balancing valve 8. The 90 bar setting of bidirectional balancing valve 8 ensures that the suspended basket 12 remains self-balanced during aerial operations even when its weight and inertia fluctuate to a certain degree. Furthermore, if the variable load pressure exceeds the set pressures of safety valve 1 (4) and safety valve 2 (5), exceeding 150 bar and 175 bar, the hydraulic oil in the leveling hydraulic system overflows from the safety valves back into the hydraulic tank, preventing it from entering leveling cylinders 1 (6) and 2 (7).

[0015] The cylinder rod of the leveling cylinder one 6 is hinged with the rotating column 10, the upper end of the rotating column 10 is hinged with a hanging arm 11, the cylinder barrel of the leveling cylinder one 6 is hinged with the hanging arm 11, and a luffing cylinder 13 is further arranged between the rotating column 10 and the hanging arm 11, the cylinder barrel of the luffing cylinder 13 is hinged with the rotating column 10, the cylinder rod of the luffing cylinder 13 is hinged with the hanging arm 11, the front end of the hanging arm 11 is hinged with a hanging basket 12, the leveling cylinder two 7 is arranged between the hanging arm 11 and the hanging basket 12, the cylinder rod of the leveling cylinder two 7 is hinged with the hanging arm 11, and the cylinder barrel of the leveling cylinder two 7 is hinged with the hanging basket 12. The leveling cylinder one 6 keeps the rotating column 10 and the hanging arm 11 balanced, the luffing cylinder 13 drives the hanging arm 11 to adjust the amplitude, and the leveling cylinder two 7 keeps the hanging basket 12 balanced.

[0016] The multi-way valve 1 and the ball valve one 2 and the ball valve two 3 are connected, the safety valve one 4 and the ball valve one 2 are connected, the safety valve two 5 and the ball valve two 3 are connected, the large cavity of the leveling cylinder one 6 is connected with the safety valve one 4, and the small cavity of the leveling cylinder one 6 is connected with the safety valve two 5, the bidirectional balance valve 8 is installed on the cylinder barrel of the leveling cylinder two 7, and the bracket pipeline assembly 9 is installed on the arm head of the hanging arm 11, and the leveling cylinder one 6 and the leveling cylinder two 7 are connected.

[0017] The leveling method of the hydraulic leveling system is as follows:

[0018] The level gauge on the hanging basket 12 is checked to see whether the inclination is within the maximum range (3°). If not, the hanging arm 11 needs to be completely lowered, the ball valve one 2 and the ball valve two 3 of the leveling system are opened, the leveling cylinder two 7 is fully retracted, and leveling is performed. Then the ball valve one 2 and the ball valve two 3 are closed, and the balance of the hanging basket 12 under the conditions of the horizontal, maximum upward angle and complete lowering of the hanging arm 11 is verified. If all tests are normal, the leveling process is completed.

[0019] The working principle of the hydraulic leveling system is as follows:

[0020] The leveling cylinder one 6 and the leveling cylinder two 7 are completely same double-acting hydraulic cylinders, comprising a cylinder barrel and a cylinder rod; the cylinder barrel has two oil ports, which are connected with the large cavity and the small cavity of the leveling cylinder respectively. The large cavities of the two leveling cylinders are connected in communication, and the small cavities are connected in communication, so as to form a closed hydraulic circuit. When aerial work is performed, when the jib 11 changes the amplitude, the leveling cylinder one 6 extends and retracts, and the hydraulic oil is pressed into the leveling cylinder two 7. Since the cylinder diameter and the rod diameter of the two leveling cylinders are completely same, when the leveling cylinder one 6 extends or retracts by a certain length, the leveling cylinder two 7 retracts or extends by the same length. Thus, after the elevation angle of the jib 11 changes, the basket 12 changes the same angle to realize compensation, and manual control is not needed, so that the self-balancing of the basket 12 is realized, and the structure is simple and reliable.

[0021] The bidirectional balance valve 8 sets the pressure: 90 bar, so that when the basket 12 changes to a certain degree due to the self-weight and inertia during the aerial work, the basket 12 always keeps self-balancing. Moreover, when the amplitude load pressure is too large, once the set pressure of the safety valve one 4: 150 bar and the set pressure of the safety valve two 5: 175 bar are exceeded, the hydraulic oil of the leveling hydraulic system will overflow from the safety valve and return to the hydraulic oil tank, so as not to enter the leveling cylinder one 6 and the leveling cylinder two 7. Thus, the system is protected, and the unbalance and shaking phenomenon during the aerial work is avoided, so that the safety reliability is high, and the leveling load capacity is large.

[0022] The utility model is not limited to the above embodiment, on the basis of the technical scheme disclosed in the utility model, the skilled in the art can make some substitutions and deformation to some technical features according to the disclosed technical content without creative labor, and these substitutions and deformation are all within the protection scope of the utility model.

Claims

1. A hydraulic leveling system for a truck-mounted crane equipped with a hanging basket, characterized in that: It includes a multi-way valve, ball valve 1, ball valve 2, safety valve 1, safety valve 2, leveling cylinder 1, leveling cylinder 2 and a two-way balancing valve; the multi-way valve is connected to ball valve 1 and ball valve 2; the safety valve 1 is connected to ball valve 1, and the safety valve 2 is connected to ball valve 2; the large chamber of the leveling cylinder 1 is connected to safety valve 1, and the small chamber of the leveling cylinder 1 is connected to safety valve 2; the safety valve 1 and safety valve 2 are both connected to the two-way balancing valve, and the large chamber and small chamber of the leveling cylinder 2 are also connected to the two-way balancing valve.

2. The hydraulic leveling system for a truck-mounted crane equipped with a hanging basket according to claim 1, characterized in that: The A oil port of the hanging basket leveling joint of the multi-way valve is connected to one end of the ball valve one, and the safety valve one and the safety valve two are both provided with two P oil ports and one T oil port. The other end of the ball valve one is connected to the P oil port of the safety valve one, and the T oil port of the safety valve one is connected to the hydraulic oil tank. The B oil port of the hanging basket leveling joint of the multi-way valve is connected to one end of the ball valve two, and the other end of the ball valve two is connected to the P oil port of the safety valve two, and the T oil port of the safety valve two is connected to the hydraulic oil tank.

3. The hydraulic leveling system for a truck-mounted crane equipped with a hanging basket according to claim 2, characterized in that: The other P oil port of the safety valve one is connected to the V1 oil port of the two-way balancing valve through the bracket pipeline assembly, and the other P oil port of the safety valve two is connected to the V2 oil port of the two-way balancing valve through the bracket pipeline assembly. The C1 oil port and C2 oil port of the two-way balancing valve are respectively connected to the large chamber and small chamber of the leveling cylinder two, and the large chamber and small chamber of the leveling cylinder one are respectively connected to the other P oil port of the safety valve one and the other P oil port of the safety valve two.

4. A hydraulic leveling system for a truck-mounted crane equipped with a hanging basket according to any one of claims 1 to 3, characterized in that: The set pressure of the safety valve 1 is 150 bar, the set pressure of the safety valve 2 is 175 bar, and the set pressure of the two-way balancing valve is 90 bar.

5. The hydraulic leveling system for a truck-mounted crane equipped with a hanging basket according to any one of claims 1 to 3, characterized in that: The cylinder rod of the leveling cylinder one is hinged to the rotating column, the upper end of the rotating column is hinged to the boom, the cylinder barrel of the leveling cylinder one is hinged to the boom, and a luffing cylinder is also provided between the rotating column and the boom, the cylinder barrel of the luffing cylinder is hinged to the rotating column, the cylinder rod of the luffing cylinder is hinged to the boom, and the front end of the boom is hinged to a hanging basket, and the leveling cylinder two is arranged between the boom and the hanging basket, the cylinder rod of the leveling cylinder two is hinged to the boom, and the cylinder barrel of the leveling cylinder two is hinged to the hanging basket.

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