Hybrid suspension for a truck crane, control method and truck crane

Abstract

The application provides a mixed suspension for a truck crane, a control method and the truck crane, and relates to the technical field of hoisting. The mixed suspension comprises a leaf spring suspension, an inclination detection assembly, a control valve assembly and two groups of suspension oil cylinder assemblies. The leaf spring suspension is arranged at the lower part of one end of a vehicle frame. The inclination detection assembly is arranged on the vehicle frame. The control valve assembly is electrically connected with the inclination detection assembly. The two groups of suspension oil cylinder assemblies are arranged at the lower part of the other end of the vehicle frame and are arranged in a spaced manner along the width direction of the vehicle frame. The two groups of suspension oil cylinder assemblies are respectively communicated with the control valve assembly. The mixed suspension detects the inclination angle of the vehicle frame through the inclination detection assembly, controls the extension or shortening of the two groups of suspension oil cylinder assemblies according to the inclination angle through the control valve assembly, and adjusts the vehicle frame to be level. Since the length sensor of the suspension oil cylinder is not arranged, the extension or shortening of the two groups of suspension oil cylinder assemblies is controlled only through the control valve assembly, and the mixed suspension has the advantages of simple structure, high stability and low production cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hoisting technology, in particular to a mixed suspension for a truck crane, a control method and a truck crane. BACKGROUND

[0002] Based on cost and layout considerations, most five-axle truck cranes use rear leaf spring suspension plus 345 axle drive. Leaf spring suspension is mature and reliable, low in cost, but limited by vehicle height, leaf spring life, etc., the up and down travel of the axle is small; the distance between the axles of the 3 / 4 / 5 axle drive is small, and the distance between the axles of the 2 / 3 axle drive is large, which easily causes the 3rd or 5th axle to be suspended and slip when going uphill or over a pothole road, and a differential lock must be engaged. Frequent engagement of the differential lock not only affects customer experience, but also easily damages the axle if the customer does not disengage the differential lock in time.

[0003] Five-axle truck cranes have more counterweights, and there are various running states with counterweights (carrying different counterweight combinations), so the axle load of the front / rear suspension changes greatly. For a mixed suspension of oil gas and leaf spring, the sensitivity of the two types of suspensions to axle load is very different, which inevitably leads to inconsistent front / rear height of the vehicle under different axle loads. Therefore, the mixed suspension must have a leveling function.

[0004] Since the height change of the leaf spring suspension under different axle load states is small, it can be used as a vehicle leveling reference, and the oil gas suspension is adjusted to the appropriate height to ensure that the front and rear heights of the vehicle are consistent. Since the specific height of the leaf spring suspension in the mixed suspension under different axle load states cannot be obtained, leveling cannot be performed by fixing the height. The existing mixed suspension has a suspension cylinder with a length sensor, which uses the length sensor to level the vehicle, and the structure is complex and the production cost is high. SUMMARY

[0005] The present application provides a mixed suspension for a truck crane to solve the problem of complex structure and high production cost of the existing mixed suspension.

[0006] The present application provides a mixed suspension for a truck crane, comprising:

[0007] A leaf spring suspension is arranged at the lower part of one end of the vehicle frame;

[0008] An inclination detection assembly is arranged on the vehicle frame;

[0009] A control valve assembly is electrically connected to the inclination detection assembly;

[0010] Two groups of suspension cylinder assemblies are arranged at the lower part of the other end of the vehicle frame and are arranged in a spaced manner along the width direction of the vehicle frame; the two groups of suspension cylinder assemblies are respectively in communication with the control valve assembly;

[0011] The inclination detection assembly is used for detecting the inclination angle of the vehicle frame, and the control valve assembly is used for controlling the extension or shortening of the two groups of suspension cylinder assemblies according to the inclination angle, so as to level the vehicle frame.

[0012] According to the mixed suspension for a truck crane provided by the present application, each group of the suspension cylinder assemblies comprises a plurality of suspension cylinders, the rodless chambers of one group of the suspension cylinders are connected in series to the first connecting port of the control valve assembly through a first pipeline, and the rod chambers of the one group of the suspension cylinders are connected in series to the second connecting port of the control valve assembly through a second pipeline; the rodless chambers of another group of the suspension cylinders are connected in series to the third connecting port of the control valve assembly through a third pipeline, and the rod chambers of the another group of the suspension cylinders are connected in series to the fourth connecting port of the control valve assembly through a fourth pipeline.

[0013] According to the mixed suspension for a truck crane provided by the present application, the plurality of suspension cylinders in the same group are arranged at intervals along the length direction of the vehicle frame, the upper ends of the suspension cylinders are connected with the vehicle frame through suspension cylinder lifting lug seats, and the lower ends of the suspension cylinders are hingedly connected with the vehicle axle.

[0014] According to the mixed suspension for a truck crane provided by the present application, the control valve assembly comprises:

[0015] a first check valve and a second check valve;

[0016] two electromagnetic reversing valves, the oil inlets of the two electromagnetic reversing valves are communicated with the oil inlet pipeline, the oil outlets of the two electromagnetic reversing valves are communicated with the oil return pipeline, the working oil outlet of one of the electromagnetic reversing valves is communicated with the first connecting port through a first connecting pipeline, the first connecting pipeline is communicated with the inlet of the first check valve, and the outlet of the first check valve is communicated with the fourth connecting port; the working oil outlet of the other of the electromagnetic reversing valves is communicated with the third connecting port through a second connecting pipeline, the second connecting pipeline is communicated with the inlet of the second check valve, and the outlet of the second check valve is communicated with the second connecting port.

[0017] According to the mixed suspension for a truck crane provided by the present application, the control valve assembly further comprises:

[0018] a first damper, a first connecting port of the first damper is communicated with the inlet of the first check valve, and a second connecting port of the first damper is communicated with the outlet of the first check valve;

[0019] a second damper, a first connecting port of the second damper is communicated with the inlet of the second check valve, and a second connecting port of the second damper is communicated with the outlet of the second check valve.

[0020] According to the mixed suspension for a truck crane provided by the present application, the control valve assembly further comprises:

[0021] A first accumulator is in communication with the first connecting port of the first damper and the inlet of the first check valve.

[0022] A second accumulator is in communication with the first connecting port of the second damper and the inlet of the second check valve.

[0023] According to the hybrid suspension for the automobile crane provided by the application, the control valve assembly further comprises:

[0024] A third damper is arranged at the working oil port of the electromagnetic reversing valve.

[0025] According to the hybrid suspension for the automobile crane provided by the application, the leaf spring suspension is arranged at the lower part of the front end of the vehicle frame, and the suspension cylinder assembly is arranged at the lower part of the rear end of the vehicle frame.

[0026] The application further provides a control method of the hybrid suspension for the automobile crane, which is based on any one of the hybrid suspensions for the automobile crane and comprises:

[0027] Determining whether the obtained inclination angle is within a preset range;

[0028] In the case that the inclination angle is determined to be out of the preset range, the two groups of suspension cylinder assemblies are controlled to be elongated or shortened according to the inclination angle, so as to level the vehicle frame.

[0029] The application further provides an automobile crane comprising the hybrid suspension for the automobile crane.

[0030] The hybrid suspension for the automobile crane provided by the application detects the inclination angle of the vehicle frame through the inclination detection assembly, controls the two groups of suspension cylinder assemblies to be elongated or shortened according to the inclination angle through the control valve assembly, and levels the vehicle frame. Since the length sensor of the suspension cylinder is not required, and the two groups of suspension cylinder assemblies are controlled to be elongated or shortened only through the control valve assembly, the hybrid suspension for the automobile crane has the advantages of simple structure, high stability and low production cost. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0032] Figure 1 It is a side view structural schematic diagram of the hybrid suspension for the automobile crane provided by the application.

[0033] Figure 2 Fig. 1 is a schematic diagram of the connection relationship of the suspension cylinder, axle, upper push rod and lower push rod provided by the present application.

[0034] Figure 3 Fig. 2 is a schematic diagram of the connection relationship of the control valve assembly and the suspension cylinder provided by the present application.

[0035] Reference signs:

[0036] 100, leaf spring suspension; 200, control valve assembly; A2, first connecting port; B2, second connecting port; B1, third connecting port; A1, fourth connecting port; 210, first one-way valve; 220, second one-way valve; 230, electromagnetic reversing valve; 240, first connecting pipeline; 250, second connecting pipeline; 260, first pipeline; 261, second pipeline; 262, third pipeline; 263, fourth pipeline; 270, first damper; 271, second damper; 272, first accumulator; 273, second accumulator; 274, third damper; 300, suspension cylinder assembly; 310, left suspension cylinder; 320, right suspension cylinder; 400, upper push rod; 410, lower push rod; 411, oil gas suspension support; 412, suspension cylinder lifting lug seat; 500, vehicle frame; 600, axle. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0038] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0040] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] The following is combined Figures 1-3 The specific structure and working principle of the hybrid suspension for automobile cranes of the present invention are described.

[0043] like Figure 1 and Figure 3As shown, the mixed suspension for the truck crane comprises a leaf spring suspension 100, an inclination detection assembly (not shown), a control valve assembly 200 and two groups of suspension cylinder assemblies 300, the leaf spring suspension 100 is arranged at the lower part of one end of a vehicle frame 500, the inclination detection assembly is arranged on the vehicle frame 500, the control valve assembly 200 is electrically connected with the inclination detection assembly, the two groups of suspension cylinder assemblies 300 are arranged at the lower part of the other end of the vehicle frame 500 and are arranged in a spaced manner along the width direction of the vehicle frame 500; the two groups of suspension cylinder assemblies 300 are communicated with the control valve assembly 200 respectively. The inclination detection assembly is used for detecting the inclination angle of the vehicle frame 500, and the control valve assembly 200 is used for controlling the elongation or shortening of the two groups of suspension cylinder assemblies 300 according to the inclination angle, so as to level the vehicle frame 500.

[0044] The mixed suspension for the truck crane provided by the application detects the inclination angle of the vehicle frame 500 through the inclination detection assembly, controls the elongation or shortening of the two groups of suspension cylinder assemblies 300 according to the inclination angle through the control valve assembly 200, so as to level the vehicle frame 500; since the length sensor of the suspension cylinder is not needed to be arranged, the elongation or shortening of the two groups of suspension cylinder assemblies 300 is only controlled through the control valve assembly 200, and the mixed suspension for the truck crane has the advantages of simple structure, high stability and low production cost.

[0045] In an embodiment of the application, as shown in Figure 3 Each group of suspension cylinder assemblies 300 comprises a plurality of suspension cylinders, the number of the suspension cylinders of each group of suspension cylinder assemblies 300 is the same, and the suspension cylinders of the two groups of suspension cylinder assemblies 300 are arranged in a one-to-one symmetry manner. Specifically, as shown in Figure 3 The left suspension cylinder assembly 300 comprises three suspension cylinders, the right suspension cylinder assembly 300 also comprises three suspension cylinders, of course, the number of the suspension cylinders of each group of suspension cylinder assemblies 300 is not limited to three, and can be four, five or more.

[0046] The rodless cavity of one group of suspension cylinders is connected in series to the first connecting port A2 of the control valve assembly 200 through the first pipeline 260, and the rod cavity of one group of suspension cylinders is connected in series to the second connecting port B2 of the control valve assembly 200 through the second pipeline 261; the rodless cavity of the other group of suspension cylinders is connected in series to the third connecting port B1 of the control valve assembly 200 through the third pipeline 262, and the rod cavity of the other group of suspension cylinders is connected in series to the fourth connecting port A1 of the control valve assembly 200 through the fourth pipeline 263.

[0047] Specifically, the control valve assembly 200 in the embodiment has four connection ports, i.e., a first connection port A2, a second connection port B2, a third connection port B1 and a fourth connection port A1. The rodless chamber of the right suspension oil cylinder 320 is connected to the first connection port A2 of the control valve assembly 200 through the first pipeline 260, and the rod chamber of the right suspension oil cylinder 320 is connected to the second connection port B2 of the control valve assembly 200 through the second pipeline 261. The rodless chamber of the left suspension oil cylinder 310 is connected to the third connection port B1 of the control valve assembly 200 through the third pipeline 262, and the rod chamber of the left suspension oil cylinder 310 is connected to the fourth connection port A1 of the control valve assembly 200 through the fourth pipeline 263. By adopting the connection mode of series connection, one control valve assembly 200 can control the same group of suspension oil cylinders to extend or shorten at the same time, thereby improving the consistency of the action of the same group of suspension oil cylinders. By adopting the above connection mode, the left and right suspension oil cylinders 320 are cross-connected, which can effectively prevent the vehicle from rolling.

[0048] In an embodiment of the present application, the plurality of suspension oil cylinders in the same group are arranged at intervals along the length direction of the vehicle frame 500, the upper end of the suspension oil cylinder is connected to the vehicle frame 500 through the suspension oil cylinder lug seat 412, the suspension oil cylinder lug seat 412 is welded to the vehicle frame 500, the upper end of the suspension oil cylinder is hinged to the suspension oil cylinder lug seat 412 through a pin shaft, and the lower end of the suspension oil cylinder is hinged to the vehicle axle 600 through a pin shaft.

[0049] In a preferred embodiment of the present application, as shown in Figure 2 two upper push rods 400 are arranged at intervals along the width direction of the vehicle frame 500, i.e., at intervals along the length direction of the vehicle axle 600, the ends of the two upper push rods 400 away from the vehicle axle 600 are close to each other to form a V-shaped or eight-shaped arrangement, the lower part of the vehicle frame 500 is provided with an oil-gas suspension support 411, the oil-gas suspension support 411 is welded to the vehicle frame 500, and the ends of the two upper push rods 400 away from the vehicle axle 600 are hinged to the corresponding oil-gas suspension supports 411 through pin shafts. The two lower push rods 410 are arranged at intervals along the length direction of the vehicle axle 600, the lower push rod 410 is located below the corresponding upper push rod 400, the lower push rod 410 is perpendicular to the length direction of the vehicle axle 600, and the ends of the two lower push rods 410 away from the vehicle axle 600 are hinged to the corresponding oil-gas suspension supports 411 through pin shafts.

[0050] Preferably, the ends of the two upper push rods 400 away from the vehicle axle 600 and the ends of the two lower push rods 410 away from the vehicle axle 600 are in the same plane, and the plane is perpendicular to the length direction of the vehicle frame 500.

[0051] In one embodiment of the present application, the control valve assembly 200 comprises a first one-way valve 210 and a second one-way valve 220, and two electromagnetic reversing valves 230, the first one-way valve 210 and the second one-way valve 220 are of the same type and have the same function.

[0052] The oil inlet of the two electromagnetic reversing valves 230 is communicated with the oil inlet pipe, the oil return of the two electromagnetic reversing valves 230 is communicated with the oil return pipe, and the oil return pipe is communicated with the oil return tank. The working oil port of one electromagnetic reversing valve 230 is communicated with the first connecting port A2 through the first connecting pipe 240; specifically, the working oil port of the right electromagnetic reversing valve 230 is communicated with the first connecting port A2 through the first connecting pipe 240, so that the working oil port of the right electromagnetic reversing valve 230 is communicated with the rodless cavity of the right suspension oil cylinder 320. The first connecting pipe 240 is communicated with the inlet of the first one-way valve 210, and the outlet of the first one-way valve 210 is communicated with the fourth connecting port A1, so as to realize the one-way conduction between the first connecting pipe 240 and the fourth connecting port A1.

[0053] The working oil port of the other electromagnetic reversing valve 230 is communicated with the third connecting port B1 through the second connecting pipe 250; specifically, the working oil port of the left electromagnetic reversing valve 230 is communicated with the third connecting port B1 through the second connecting pipe 250, so that the working oil port of the left electromagnetic reversing valve 230 is communicated with the rodless cavity of the left suspension oil cylinder 310. The second connecting pipe 250 is communicated with the inlet of the second one-way valve 220, and the outlet of the second one-way valve 220 is communicated with the second connecting port B2, so as to realize the one-way conduction between the second connecting pipe 250 and the third connecting port B1.

[0054] In one embodiment of the present application, the inclination detection assembly comprises an inclination sensor, which is used to detect the inclination of the vehicle frame 500 in the left-right direction and can also be used to detect the inclination of the vehicle frame 500 in the front-rear direction. The inclination sensor can be set to one, two, three or more, which is determined according to actual needs. When the inclination sensor is set to one, the inclination sensor is used to detect the inclination of the vehicle frame 500 in the left-right direction and the inclination of the vehicle frame 500 in the front-rear direction; when the inclination sensor is set to two, one inclination sensor is used to detect the inclination of the vehicle frame 500 in the left-right direction, and the other inclination sensor is used to detect the inclination of the vehicle frame 500 in the front-rear direction.

[0055] In one embodiment of the present application, as Figure 3As shown, the two electromagnetic reversing valves 230 are of the same type, and each of the two electromagnetic reversing valves 230 is provided with two electromagnetic coils; the left electromagnetic reversing valve 230 is provided with a first electromagnetic coil DT01 and a second electromagnetic coil DT02, and the right electromagnetic reversing valve 230 is provided with a third electromagnetic coil DT03 and a fourth electromagnetic coil DT04. In use, the working position of the electromagnetic reversing valve 230 can be changed by supplying power to different electromagnetic coils. For example, when the first electromagnetic coil DT01 of the left electromagnetic reversing valve 230 is powered, the left electromagnetic reversing valve 230 works on the left side; when the second electromagnetic coil DT02 of the left electromagnetic reversing valve 230 is powered, the left electromagnetic reversing valve 230 works on the right side; similarly, the working condition of the right electromagnetic reversing valve 230 is the same as that of the left electromagnetic reversing valve 230.

[0056] In an embodiment of the present application, as shown in Figure 3 The control valve assembly 200 further comprises a first damper 270 and a second damper 271, the first connection port A2 of the first damper 270 is in communication with the inlet of the first check valve 210, and the second connection port B2 of the first damper 270 is in communication with the outlet of the first check valve 210. The first damper 270 is arranged to control the speed of oil supply to the rod cavity of the right suspension oil cylinder 320, reduce vibration and impact, and prolong the service life of the right suspension oil cylinder 320.

[0057] The first connection port A2 of the second damper 271 is in communication with the inlet of the second check valve 220, and the second connection port B2 of the second damper 271 is in communication with the outlet of the second check valve 220. The second damper 271 is arranged to control the speed of oil supply to the rod cavity of the left suspension oil cylinder 310, reduce vibration and impact, and prolong the service life of the left suspension oil cylinder 310.

[0058] In an embodiment of the present application, as shown in Figure 3 The control valve assembly 200 further comprises a first accumulator 272 and a second accumulator 273, the first accumulator 272 is in communication with the first connection port A2 of the first damper 270 and the inlet of the first check valve 210; the first accumulator 272 is used to provide pressure for the rodless cavity of the right suspension oil cylinder 320, and maintain its stable state. The second accumulator 273 is in communication with the first connection port A2 of the second damper 271 and the inlet of the second check valve 220, and the second accumulator 273 is used to provide pressure for the rodless cavity of the left suspension oil cylinder 310, and maintain its stable state.

[0059] In an embodiment of the present application, the control valve assembly 200 further comprises a third damper 274, and the third damper 274 is arranged at the working oil port of the electromagnetic reversing valve 230. Specifically, as shown in Figure 3As shown, the control valve assembly 200 includes two third dampers 274, the third damper 274 on the left is arranged at the working oil port of the left electromagnetic directional valve 230, and the third damper 274 on the right is arranged at the working oil port of the right electromagnetic directional valve 230.

[0060] In an embodiment of the present application, the leaf spring suspension 100 is arranged at the lower part of the front end of the vehicle frame 500, and the suspension cylinder assembly 300 is arranged at the lower part of the rear end of the vehicle frame 500, wherein the front end of the vehicle frame 500 refers to the end of the vehicle frame 500 close to the vehicle head, and the rear end of the vehicle frame 500 refers to the end of the vehicle frame 500 away from the vehicle head. Of course, the leaf spring suspension 100 can also be arranged at the lower part of the rear end of the vehicle frame 500, and the suspension cylinder assembly 300 can also be arranged at the lower part of the front end of the vehicle frame 500.

[0061] The working principle of the hybrid suspension for the automobile crane of the present application is as follows:

[0062] When the vehicle frame 500 is inclined to the left, that is, the right side of the vehicle frame 500 is high and the left side is low, at this time, the control valve assembly 200 needs to control the left suspension cylinder 310 to elongate and the right suspension cylinder 320 to shorten. By supplying power to the second electromagnetic coil DT02 of the left electromagnetic directional valve 230 and the third electromagnetic coil DT03 of the right electromagnetic directional valve 230, the left electromagnetic directional valve 230 works in the right position, and the right electromagnetic directional valve 230 works in the left position, so that the pressure oil passes through the right position of the left electromagnetic directional valve 230, then passes through the third connecting port B1 into the rodless cavity of the left suspension cylinder 310, the pressure oil in the rod cavity of the left suspension cylinder 310 enters the right electromagnetic directional valve 230 through the fourth pipeline 263, the fourth connecting port A1 and the first connecting pipeline 240, and finally enters the oil return tank through the oil return port of the right electromagnetic directional valve 230 and the oil return pipe, thereby realizing the elongation of the left suspension cylinder 310. At the same time, the pressure oil at the working oil port of the left electromagnetic directional valve 230 enters the rod cavity of the right suspension cylinder 320 through the second connecting pipe, the second connecting port B2 and the second pipeline 261, the pressure oil in the rodless cavity of the right suspension cylinder 320 enters the right electromagnetic directional valve 230 through the first pipeline 260, the first connecting port A2 and the first connecting pipeline 240, and finally enters the oil return tank through the oil return port of the right electromagnetic directional valve 230 and the oil return pipe.

[0063] When the vehicle frame 500 is inclined to the right, that is, the left side of the vehicle frame 500 is high and the right side is low, at this time, the control valve assembly 200 needs to control the right suspension cylinder 320 to elongate and the left suspension cylinder 310 to shorten. Similarly, by supplying power to the first electromagnetic coil DT01 of the left electromagnetic directional valve 230 and the fourth electromagnetic coil DT04 of the right electromagnetic directional valve 230, the left electromagnetic directional valve 230 works in the left position, and the right electromagnetic directional valve 230 works in the right position, thereby realizing the leveling of the vehicle frame.

[0064] The mixed suspension for a truck crane provided by the application detects the inclination angle of the vehicle frame 500 through the inclination detection assembly, controls the extension or shortening of the two groups of suspension cylinder assemblies 300 according to the inclination angle through the control valve assembly 200, and levels the vehicle frame 500.

[0065] The application further provides a control method of the mixed suspension for a truck crane, which is based on the mixed suspension for a truck crane according to any one of the above embodiments, and comprises the following steps:

[0066] determining whether the obtained inclination angle is within a preset range;

[0067] controlling the extension or shortening of the two groups of suspension cylinder assemblies 300 according to the inclination angle to level the vehicle frame 500 when it is determined that the inclination angle is out of the preset range.

[0068] In one embodiment of the application, the step of controlling the extension or shortening of the two groups of suspension cylinder assemblies 300 according to the inclination angle to level the vehicle frame 500 comprises:

[0069] controlling the left suspension cylinder 310 to extend and the right suspension cylinder 320 to shorten when the inclination angle indicates that the vehicle frame 500 is inclined to the left;

[0070] controlling the right suspension cylinder 320 to extend and the left suspension cylinder 310 to shorten when the inclination angle indicates that the vehicle frame 500 is inclined to the right.

[0071] The application further provides a truck crane comprising the mixed suspension for a truck crane according to any one of the above embodiments.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, rather than limit them; although the application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacements to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A hybrid suspension for a truck crane, characterized in that, include: Leaf spring suspension (100) is located at the lower part of one end of the frame (500); An angle detection component is mounted on the vehicle frame (500). The control valve assembly (200) is electrically connected to the tilt angle detection assembly; Two sets of suspension cylinder assemblies (300) are disposed at the lower part of the other end of the frame (500) and are spaced apart along the width direction of the frame (500); the two sets of suspension cylinder assemblies (300) are respectively connected to the control valve assembly (200); The tilt angle detection component is used to detect the tilt angle of the frame (500), and the control valve assembly (200) is used to control the two sets of suspension cylinder assemblies (300) to extend or shorten according to the tilt angle, so as to level the frame (500). Each set of suspension cylinder assemblies (300) includes multiple suspension cylinders. The rodless chamber of one set of suspension cylinders is connected in series to the first connection port (A2) of the control valve assembly (200) through a first pipe (260), and the rod chamber of one set of suspension cylinders is connected in series to the second connection port (B2) of the control valve assembly (200) through a second pipe (261). The rodless chamber of another set of suspension cylinders is connected in series to the third connection port (B1) of the control valve assembly (200) through a third pipe (262), and the rod chamber of another set of suspension cylinders is connected in series to the fourth connection port (A1) of the control valve assembly (200) through a fourth pipe (263).

2. The hybrid suspension for a truck crane according to claim 1, characterized in that, Multiple suspension cylinders in the same group are arranged at intervals along the length of the frame (500). The upper end of the suspension cylinder is connected to the frame (500) through the suspension cylinder hanger seat (412), and the lower end of the suspension cylinder is hinged to the axle (600).

3. The hybrid suspension for a truck crane according to claim 1, characterized in that, The control valve assembly (200) includes: First check valve (210) and second check valve (220); Two electromagnetic directional valves (230) are provided. The inlet ports of the two electromagnetic directional valves (230) are connected to the inlet pipe, and the return ports of the two electromagnetic directional valves (230) are connected to the return pipe. The working port of one electromagnetic directional valve (230) is connected to the first connection port (A2) through the first connecting pipe (240). The first connecting pipe (240) is connected to the inlet of the first check valve (210), and the outlet of the first check valve (210) is connected to the fourth connection port (A1). The working port of the other electromagnetic directional valve (230) is connected to the third connection port (B1) through the second connecting pipe (250). The second connecting pipe (250) is connected to the inlet of the second check valve (220), and the outlet of the second check valve (220) is connected to the second connection port (B2).

4. The hybrid suspension for a truck crane according to claim 3, characterized in that, The control valve assembly (200) also includes: The first damper (270) has a first connection port (A2) connected to the inlet of the first check valve (210) and a second connection port (B2) connected to the outlet of the first check valve (210). The second damper (271) has its first connection port (A2) connected to the inlet of the second check valve (220) and its second connection port (B2) connected to the outlet of the second check valve (220).

5. The hybrid suspension for a truck crane according to claim 4, characterized in that, The control valve assembly (200) also includes: The first accumulator (272) is connected to the first connection port (A2) of the first damper (270) and the inlet of the first one-way valve (210); The second accumulator (273) is connected to the first connection port (A2) of the second damper (271) and the inlet of the second check valve (220).

6. The hybrid suspension for a truck crane according to any one of claims 3 to 5, characterized in that, The control valve assembly (200) also includes: The third damper (274) is located at the working port of the electromagnetic directional valve (230).

7. The hybrid suspension for a truck crane according to any one of claims 3 to 5, characterized in that, The leaf spring suspension (100) is located at the lower part of the front end of the frame (500), and the suspension cylinder assembly (300) is located at the lower part of the rear end of the frame (500).

8. A control method for a hybrid suspension for a truck crane, said method being based on the hybrid suspension for a truck crane according to any one of claims 1 to 7, characterized in that, include: Determine whether the acquired tilt angle is within the preset range; If the tilt angle is determined to be outside the preset range, the two sets of suspension cylinder assemblies (300) are controlled to extend or shorten according to the tilt angle in order to level the frame (500).

9. A truck crane, characterized in that, Includes the hybrid suspension for automobile cranes as described in any one of claims 1 to 7.

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