CN220283562U - Counterweight hydraulic control device and overhead working truck - Google Patents

Abstract

The utility model discloses a counterweight hydraulic control device and an overhead working truck, wherein the counterweight hydraulic control device comprises a driven oil cylinder and a counterweight adjusting mechanism, the driven oil cylinder is arranged on a rotating table arm in a swinging way, the telescopic end of the driven oil cylinder is connected with a basic arm of a telescopic boom, a swinging bracket of the counterweight adjusting mechanism is arranged on one side of the rotating table arm, which is far away from a working platform, and the upper end of the swinging bracket is hinged on the rotating table arm, a swinging counterweight is arranged at the lower end of the swinging bracket, the swinging oil cylinder is arranged on the rotating table arm in a swinging way, the telescopic end of the swinging counterweight is connected with the swinging bracket so as to drive the swinging counterweight to swing towards a direction far away from or close to the rotating table arm, a rodless cavity of the driven oil cylinder is communicated with a rodless cavity of the swinging oil cylinder, namely, the swinging oil cylinder in the driven oil cylinder and the counterweight adjusting mechanism form a closed oil way, and the position of the swinging counterweight can be adjusted without electrification control, so that the difficulty of development and maintenance can be reduced.

Description

Counterweight hydraulic control device and overhead working truck

Technical Field

The utility model belongs to the technical field of engineering machinery, and particularly relates to a counterweight hydraulic control device and an overhead working truck.

Background

The overhead working truck is a special vehicle for transporting workers and using equipment to the high altitude to install, maintain and clean equipment located at the high altitude, and has the advantages of good working performance, high working efficiency, safe operation and the like compared with the traditional working modes such as a scaffold, a ladder and the like, and is widely applied to the infrastructure industries such as electric power, traffic, petrochemical industry, communication, gardens and the like at present.

In order to ensure the stability of the whole vehicle, a counterweight is generally arranged on the working vehicle to improve the anti-overturning moment of the whole vehicle, and the anti-overturning moment required by the whole vehicle can be changed along with the change of the working angle of the arm support, particularly when the arm support is in a small-angle working state, the working platform is positioned at the rear end of the vehicle body and far away from the rotation center, and the anti-overturning moment required by the whole vehicle is relatively large. At present, although a scheme of changing the position of the counterweight through the telescopic mechanism to realize adjustment of the anti-overturning moment exists, how to control the telescopic mechanism can be determined after a series of complex calculations are performed according to the detection data of the position sensor, and in order to realize electrification control of the telescopic mechanism, development and maintenance difficulties are necessarily increased.

Disclosure of Invention

The utility model provides a counterweight hydraulic control device and an overhead working truck, aiming at solving the technical problem that the electrified control of a telescopic mechanism can cause the increase of development and maintenance difficulty.

In order to achieve the above object, the present utility model provides a counterweight hydraulic control device, wherein the counterweight hydraulic control device includes a passive cylinder and a counterweight adjusting mechanism; the passive oil cylinder is arranged on the rotating table arm in a staggered amplitude variation oil cylinder in a swinging way, and the telescopic end of the passive oil cylinder is connected with the basic arm of the telescopic arm support; the balance weight adjusting mechanism comprises a swing oil cylinder, a swing bracket and a swing balance weight, the swing bracket is arranged on one side of the turntable arm, which is far away from the working platform, and the upper end of the swing bracket is hinged on the turntable arm, the swing balance weight is arranged at the lower end of the swing bracket, the swing oil cylinder is arranged on the turntable arm in a swinging way, and the telescopic end of the swing oil cylinder is connected with the swing bracket, so that the swing balance weight can be driven to swing towards the direction, which is far away from or close to the turntable arm, through telescopic movement; the rodless cavity of the driven oil cylinder is communicated with the rodless cavity of the swinging oil cylinder, and the rod cavity of the driven oil cylinder is communicated with the rod cavity of the swinging oil cylinder.

In the embodiment of the utility model, the counterweight hydraulic control device further comprises a leveling oil cylinder for leveling the working platform, wherein the rodless cavity of the driven oil cylinder is respectively communicated with the rodless cavities of the swinging oil cylinder and the leveling oil cylinder, and the rod cavities of the driven oil cylinder are respectively communicated with the rod cavities of the swinging oil cylinder and the leveling oil cylinder.

In the embodiment of the utility model, the cross section sizes of the inner cavities of the swinging oil cylinder and the leveling oil cylinder are 1: n is set, and the passive oil cylinder is set according to 1: and 1, oil supply is carried out to the swinging oil cylinder and the leveling oil cylinder.

In the embodiment of the utility model, a first flow distributing and collecting valve is connected between rodless cavities of the swing cylinder and the leveling cylinder and is communicated with the rodless cavity of the driven cylinder through the first flow distributing and collecting valve; a second flow dividing and collecting valve is connected between the rod cavities of the swing cylinder and the leveling cylinder and is communicated with the rod cavity of the driven cylinder through the second flow dividing and collecting valve.

In the embodiment of the utility model, the counterweight hydraulic control device further comprises a first balance valve with two first balance oil paths, wherein one of the first balance oil paths is connected with the rodless cavity of the swing cylinder and the first flow dividing and collecting valve, and the other one of the first balance oil paths is connected with the rod cavity of the swing cylinder and the second flow dividing and collecting valve.

In the embodiment of the utility model, a first one-way valve and a first overflow valve are arranged on the first balance oil path in parallel, the first one-way valve is used for supplying oil to the swing oil cylinder by the driven oil cylinder, and the first overflow valve is used for supplying oil to the driven oil cylinder under the condition that the pressure in the swing oil cylinder reaches the preset pressure.

In the embodiment of the utility model, the counterweight hydraulic control device further comprises a second counterweight valve with two second counterweight oil paths, wherein one second counterweight oil path is connected with the rodless cavity of the leveling oil cylinder and the first flow dividing and collecting valve, and the other second counterweight oil path is connected with the rod cavity of the leveling oil cylinder and the second flow dividing and collecting valve.

In the embodiment of the utility model, the counterweight hydraulic control device further comprises a third balance valve with two third balance oil paths, wherein one third balance oil path is connected with the oil tank and the rodless cavity of the driven oil cylinder, and the other third balance oil path is connected with the oil tank and the rod cavity of the driven oil cylinder.

In the embodiment of the utility model, the counterweight hydraulic control device further comprises a reversing valve arranged between the oil tank and the third balance valve, wherein the reversing valve is provided with a first working oil port and a second working oil port which are respectively connected with the two third balance oil paths in one-to-one correspondence, and is used for selecting one of the first working oil port and the second working oil port to be connected with an oil pumping piece connected with the oil tank.

In order to achieve the above object, the present utility model also provides an overhead working truck, wherein the overhead working truck comprises the counterweight hydraulic control device according to the above.

Through the technical scheme, the counterweight hydraulic control device provided by the embodiment of the utility model has the following beneficial effects:

when the counterweight hydraulic control device is used, the passive oil cylinder is staggered with the amplitude variation oil cylinder and is arranged on the rotating table arm in a swinging way, the telescopic end is connected with the basic arm of the telescopic arm support, namely, when the amplitude variation oil cylinder stretches out to drive the telescopic arm support to lift, the passive oil cylinder can stretch out in a following way, when the amplitude variation oil cylinder stretches back to drive the telescopic arm support to put down, the passive oil cylinder can stretch out in a following way, in addition, the swinging bracket of the counterweight regulating mechanism is arranged on one side of the rotating table arm, which is far away from the working platform, and the upper end of the swinging bracket is hinged on the rotating table arm, the swinging counterweight is arranged at the lower end of the swinging bracket, the swinging oil cylinder is arranged on the rotating table arm in a swinging way, and the telescopic end is connected with the swinging bracket, so that the swinging counterweight can be driven by telescopic motion to swing towards the direction away from or close to the rotating table arm, and the rodless rod cavity of the swinging oil cylinder is communicated with the rodless rod cavity of the swinging oil cylinder, when the amplitude variation oil cylinder is required to be switched from a small angle to a large angle operation state, and the swinging rod of the swinging oil cylinder can stretch out towards the rotating table arm is required to move towards the swinging arm cavity of the swinging arm; when the telescopic boom is required to be switched from a large-angle operation state to a small-angle operation state, the driven oil cylinder is retracted along with the variable-amplitude oil cylinder, oil in a rodless cavity of the driven oil cylinder can enter a rodless cavity of the swinging oil cylinder, oil in a rod cavity of the swinging oil cylinder enters a rod cavity of the driven oil cylinder, and then the swinging oil cylinder can be driven to extend and drive the swinging counterweight to swing towards a direction away from the turntable arm, so that larger overturning prevention moment required by the small-angle operation state is met.

Additional features and advantages of the utility model will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide an understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the description serve to explain, without limitation, the utility model. In the drawings:

FIG. 1 is a schematic view of an overhead working truck in a low angle operation according to an embodiment of the present utility model;

FIG. 2 is a schematic view of an overhead working truck in a high angle operation according to an embodiment of the present utility model;

fig. 3 is a hydraulic control schematic diagram of a counterweight hydraulic control device in accordance with an embodiment of the utility model.

Description of the reference numerals in the embodiments of the utility model

100. Amplitude variable oil cylinder of passive oil cylinder 101

102. Telescopic boom of turntable arm 103

104. Third balance valve 105 third balance oil passage

200. Balance weight adjusting mechanism 201 swinging oil cylinder

202. Swing bracket 203 swing weight

204. First balance valve 205 first balance oil path

206. First check valve 207 first relief valve

300. Leveling cylinder 301 working platform

302. Second balance valve 303 second balance oil path

400. First flow dividing and collecting valve 500 and second flow dividing and collecting valve

600. First working oil port of reversing valve A

B a second working oil port

Detailed Description

Specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration and explanation only and are not intended to limit the present utility model.

The counterweight hydraulic control device and the overhead working truck of the utility model are described below with reference to the drawings.

As shown in fig. 1 to 3, the present utility model provides a counterweight hydraulic control device, wherein the counterweight hydraulic control device includes:

the passive oil cylinder 100 is used for staggering the amplitude variation oil cylinder 101, is arranged on the turntable arm 102 in a swinging way, and the telescopic end of the passive oil cylinder 100 is connected with the basic arm of the telescopic arm support 103;

the balance weight adjusting mechanism 200 comprises a swing oil cylinder 201, a swing bracket 202 and a swing balance weight 203, wherein the swing bracket 202 is arranged on one side of the turntable arm 102, which is away from the working platform 301, and the upper end of the swing bracket is hinged on the turntable arm 102, the swing balance weight 203 is arranged at the lower end of the swing bracket 202, the swing oil cylinder 201 is arranged on the turntable arm 102 in a swinging way, and the telescopic end of the swing oil cylinder is connected with the swing bracket 202 so as to drive the swing balance weight 203 to swing towards a direction away from or close to the turntable arm 102 through telescopic movement;

the rodless cavity of the passive oil cylinder 100 is communicated with the rodless cavity of the swing oil cylinder 201, and the rod cavity of the passive oil cylinder 100 is communicated with the rod cavity of the swing oil cylinder 201.

When the counterweight hydraulic control device is used, the passive oil cylinder 100 is staggered with the amplitude variation oil cylinder 101 and is arranged on the turntable arm 102 in a swinging way, and the telescopic end is connected with the basic arm of the telescopic boom 103, namely, when the amplitude variation oil cylinder 101 stretches out to drive the telescopic boom 103 to lift, the passive oil cylinder 100 can stretch out in a following way, when the amplitude variation oil cylinder 101 retracts to drive the telescopic boom 103 to descend, the passive oil cylinder 100 can retract in a following way, in addition, the swinging bracket 202 of the counterweight regulating mechanism 200 is arranged on one side of the turntable arm 102, which is far away from the working platform 301, and the upper end of the swinging bracket 202 is hinged on the turntable arm 102, the swinging counterweight 203 is arranged at the lower end of the swinging bracket 202, the swinging oil cylinder 201 can be arranged on the turntable arm 102 in a swinging way, and the telescopic end is connected with the swinging bracket 202, so that the swinging counterweight 203 can be driven to swing in a direction far away from or close to the turntable arm 102 through telescopic motion, and the rodless rod cavity of the passive oil cylinder 100 is communicated with the rodless rod cavity of the swinging oil cylinder 201, and the swinging arm 201 can be driven to move in a small angle to the swing arm 201 when the swinging arm 201 is required to stretch out from the turntable arm 100, and the swinging arm 201 is required to be in a large angle to be switched to be in a small state, and the swinging arm 201 is required to be driven to move in a small angle to be far from the swing arm 201; when the telescopic boom 103 needs to be switched from a large-angle operation state to a small-angle operation state, in the process that the passive oil cylinder 100 retracts along with the luffing oil cylinder 101, oil in a rodless cavity of the passive oil cylinder 100 can enter a rodless cavity of the swinging oil cylinder 201, oil in a rod cavity of the swinging oil cylinder 201 enters a rod cavity of the passive oil cylinder 100, and then the swinging oil cylinder 201 can be driven to extend and drive the swinging counterweight 203 to swing towards a direction far away from the turntable arm 102, so that a larger anti-overturning moment required by the small-angle operation state is met.

Referring again to fig. 1 to 3, in the embodiment of the present utility model, the counterweight hydraulic control device further includes a leveling cylinder 300 for leveling the working platform 301, the rodless chambers of the passive cylinder 100 are respectively communicated with the rodless chambers of the swing cylinder 201 and the leveling cylinder 300, and the rod chambers of the passive cylinder 100 are respectively communicated with the rod chambers of the swing cylinder 201 and the leveling cylinder 300. When the telescopic boom 103 is required to be switched from the small-angle operation state to the large-angle operation state, in the process that the driven oil cylinder 100 extends along with the luffing oil cylinder 101, oil in rod cavities of the driven oil cylinder 100 can enter rod cavities of the swinging oil cylinder 201 and the leveling oil cylinder 300 respectively, and oil in rod-free cavities of the swinging oil cylinder 201 and the leveling oil cylinder 300 enter rod-free cavities of the driven oil cylinder 100, so that the leveling oil cylinder 300 can be driven to retract while the swinging oil cylinder 201 is driven to retract; when the telescopic boom 103 needs to be switched from a large-angle operation state to a small-angle operation state, in the process that the driven oil cylinder 100 retracts along with the luffing oil cylinder 101, oil in the rodless cavity of the driven oil cylinder 100 can enter the rodless cavities of the swinging oil cylinder 201 and the leveling oil cylinder 300 respectively, and oil in the rod cavities of the swinging oil cylinder 201 and the leveling oil cylinder 300 enter the rod cavities of the driven oil cylinder 100, so that the swinging oil cylinder 201 is driven to extend and the leveling oil cylinder 300 is driven to retract. Namely, the passive oil cylinder 100, the swinging oil cylinder 201 and the leveling oil cylinder 300 form a closed oil way, and the driving of the swinging oil cylinder 201 and the leveling oil cylinder 300 does not need electrification control, so that the difficulty of development and maintenance is further reduced.

In the embodiment of the present utility model, the cross-sectional dimensions of the inner cavities of the swing cylinder 201 and the leveling cylinder 300 are 1: n is set, the passive oil cylinder 100 can evenly distribute oil flowing out from an oil outlet to the adjusting oil cylinder 201 and the leveling oil cylinder 300, namely, the passive oil cylinder 100 is used for adjusting the oil according to the following ratio of 1:1 to the adjusting cylinder 201 and the leveling cylinder 300 so that the adjusting cylinder 201 and the leveling cylinder 300 are supplied with oil according to n: and 1, the extension quantity stretches out, and the balance weight and leveling position adjustment is met. Specifically, the first current and current dividing valve 400 or the second current and dividing valve 500 may be controlled to realize the average distribution of the passive oil cylinder 100, and the cross-sectional dimensions of the inner cavities of the adjusting oil cylinder 201 and the leveling oil cylinder 300 may be 1:1, then under the average distribution of the passive cylinders 100, the adjusting cylinder 201 and the leveling cylinder 300 are set as 1: 1. Of course, the utility model is not limited thereto, and in the specific implementation process, the adjusting oil cylinder 201 and the leveling oil cylinder 300 with different inner cavity section size ratios can be selected according to the elongation requirements of the adjusting oil cylinder 201 and the leveling oil cylinder 300, or the flow dividing and collecting valves with different flow dividing ratios can be selected.

Referring to fig. 3, in the embodiment of the present utility model, a first flow distributing and collecting valve 400 is connected between the rodless cavities of the swing cylinder 201 and the leveling cylinder 300, and is communicated with the rodless cavity of the passive cylinder 100 through the first flow distributing and collecting valve 400, that is, the rodless cavities of the passive cylinder 100 can be distributed to the rodless cavities of the swing cylinder 201 and the leveling cylinder 300 through the first flow distributing and collecting valve 400, and the rodless cavities of the swing cylinder 201 and the leveling cylinder 300 can be also distributed to the rodless cavity of the passive cylinder 100 through the first flow distributing and collecting valve 400; a second flow dividing and collecting valve 500 is connected between the rod cavities of the swing cylinder 201 and the leveling cylinder 300 and is communicated with the rod cavity of the driven cylinder 100 through the second flow dividing and collecting valve 500, namely, the rod cavity of the driven cylinder 100 can be divided into the rod cavities of the swing cylinder 201 and the leveling cylinder 300 through the second flow dividing and collecting valve 500, and the rod cavities of the swing cylinder 201 and the leveling cylinder 300 can be also combined into the rod cavity of the driven cylinder 100 through the second flow dividing and collecting valve 500.

Referring again to fig. 3, in the embodiment of the present utility model, the counterweight hydraulic control device further includes a first balance valve 204 having two first balance oil paths 205, wherein one of the first balance oil paths 205 connects the rodless chamber of the swing cylinder 201 and the first split and collector valve 400, and the other of the first balance oil paths 205 connects the rod chamber of the swing cylinder 201 and the second split and collector valve 500. The first balance valve 204 is additionally arranged, so that the stable action of the swing cylinder 201 and the explosion-proof safety of a pipeline can be ensured.

In the embodiment of the present utility model, the first check valve 206 and the first relief valve 207 are disposed on the first balance oil path 205 in parallel, where the first check valve 206 is used for supplying oil to the swing oil cylinder 201 from the passive oil cylinder 100, that is, when the passive oil cylinder 100 actively supplies oil to the swing oil cylinder 201, the first check valve 206 can flow to the swing oil cylinder 201, and meanwhile, the first relief valve 207 is used for supplying oil to the passive oil cylinder 100 when the pressure in the swing oil cylinder 201 reaches the preset pressure, that is, only when the pressure in the oil supply cavity (no rod cavity or rod cavity) of the swing oil cylinder 201 reaches the preset pressure of the first relief valve 207, the first relief valve 207 can be opened, so as to achieve the purposes of ensuring stable motion and anti-explosion safety of the pipeline.

In the embodiment of the present utility model, the counterweight hydraulic control device further includes a second balance valve 302 having two second balance oil paths 303, wherein one second balance oil path 303 is connected to the rodless chamber of the leveling cylinder 300 and the first split and collector valve 400, and the other second balance oil path 303 is connected to the rod chamber of the leveling cylinder 300 and the second split and collector valve 500. The addition of the second balance valve 302 can ensure the stable action of the leveling cylinder 300 and the explosion-proof safety of the pipeline.

Specifically, the second balance oil path 303 is provided with a second check valve and a second overflow valve in parallel, where the second check valve is used for supplying oil to the leveling oil cylinder 300 from the passive oil cylinder 100, that is, when the passive oil cylinder 100 actively supplies oil to the leveling oil cylinder 300, the second check valve can flow to the leveling oil cylinder 300 from the second check valve, and meanwhile, the second overflow valve is used for supplying oil to the passive oil cylinder 100 when the pressure in the leveling oil cylinder 300 reaches a preset pressure, that is, only when the pressure in an oil supply cavity (a rodless cavity or a rod cavity) of the leveling oil cylinder 300 reaches the preset pressure of the second overflow valve, the second overflow valve can be opened, so that the purposes of ensuring stable action and explosion-proof safety of a pipeline can be achieved.

In the embodiment of the present utility model, the counterweight hydraulic control device further includes a third balance valve 104 having two third balance oil paths 105, wherein one third balance oil path 105 connects the oil tank and the rodless chamber of the passive cylinder 100, and the other third balance oil path 105 connects the oil tank and the rod chamber of the passive cylinder 100. The third balance valve 104 is additionally arranged, so that when the oil in the closed control oil way is too much, the third balance valve 104 can be opened through the internal pressure, so that the oil flows back to the oil tank, and the safety of the closed control oil way is ensured. Specifically, the first split and combined valve 400 is connected between the rodless chamber of the passive cylinder 100 and the corresponding third balancing oil passage 105, and the second split and combined valve 500 is connected between the rod chamber of the passive cylinder 100 and the corresponding third balancing oil passage 105.

Specifically, the third balance oil path 105 is provided with a third check valve and a third overflow valve in parallel, where the third check valve is used for supplying oil to the passive oil cylinder 100 from the oil supply tank, that is, when the oil pumping member connected with the oil tank supplies oil to the passive oil cylinder 100, the oil can flow from the third check valve to the passive oil cylinder 100, and meanwhile, the third overflow valve is used for returning oil to the oil tank when the pressure in the passive oil cylinder 100 reaches the preset pressure.

Referring to fig. 3, in the embodiment of the present utility model, the counterweight hydraulic control device further includes a reversing valve 600 interposed between the tank and the third balance valve 104, the reversing valve 600 having a first working port a and a second working port B respectively connected to the two third balance oil passages 105 in one-to-one correspondence, and being configured to select one of the first working port a and the second working port B to be connected to a pumping member connected to the tank. When the first working oil port a is connected with the third balance oil path 105 connected with the rodless cavity of the passive oil cylinder 100, the second working oil port B is connected with the third balance oil path 105 connected with the rodless cavity of the passive oil cylinder 100, the reversing valve 600 can be switched to the first working oil port a to be connected with the oil pumping member, the oil pumping member pumps oil from the first working oil port a to the rodless cavity of the passive oil cylinder 100, the rodless cavity is filled with oil, then switched to the second working oil port B to be connected with the oil pumping member, the oil pumping member pumps oil from the second working oil port B to the rodless cavity of the passive oil cylinder 100, and meanwhile, the oil in the rodless cavity of the passive oil cylinder 100 is shunted into the rodless cavities of the swing oil cylinder 201 and the leveling oil cylinder 300 until the rodless cavity of the passive oil cylinder 100 is filled with oil, the rodless cavities of the swing oil cylinder 201 and the leveling oil cylinder 300 are in a fully retracted state, and the rodless cavity of the leveling oil is fully extended state, so that the pre-injection of the oil in the closed control oil path can be realized. Specifically, the reversing valve 600 may be a manual reversing valve 600.

In order to achieve the above object, the present utility model also provides an overhead working truck, wherein the overhead working truck comprises the counterweight hydraulic control device according to the above. Because the aerial working vehicle adopts all the technical schemes of the embodiments, the aerial working vehicle at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted here.

In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (10)

1. A counterweight hydraulic control device, characterized by comprising:

the passive oil cylinder (100) is used for staggering the amplitude variation oil cylinder (101) and is arranged on the turntable arm (102) in a swinging way, and the telescopic end of the passive oil cylinder (100) is connected with the basic arm of the telescopic arm support (103);

the balance weight adjusting mechanism (200) comprises a swing oil cylinder (201), a swing bracket (202) and a swing balance weight (203), wherein the swing bracket (202) is arranged on one side of the turntable arm (102) away from the working platform (301) and the upper end of the swing bracket is hinged to the turntable arm (102), the swing balance weight (203) is arranged at the lower end of the swing bracket (202), the swing oil cylinder (201) is arranged on the turntable arm (102) in a swinging way, and the telescopic end of the swing oil cylinder is connected with the swing bracket (202) so as to drive the swing balance weight (203) to swing in a direction away from or close to the turntable arm (102) through telescopic movement;

the rodless cavity of the driven oil cylinder (100) is communicated with the rodless cavity of the swinging oil cylinder (201), and the rod cavity of the driven oil cylinder (100) is communicated with the rod cavity of the swinging oil cylinder (201).

2. The counterweight hydraulic control device according to claim 1, characterized in that the counterweight hydraulic control device further comprises a leveling cylinder (300) for leveling the work platform (301), the rodless cavity of the passive cylinder (100) being in communication with the rodless cavities of the swing cylinder (201) and the leveling cylinder (300), respectively, and the rod cavities of the passive cylinder (100) being in communication with the rod cavities of the swing cylinder (201) and the leveling cylinder (300), respectively.

3. The counterweight hydraulic control device according to claim 2, characterized in that the inner cavity cross-sectional dimensions of the swing cylinder (201) and the leveling cylinder (300) are 1: n is set, and the passive oil cylinder (100) is arranged according to the following weight of 1:1 to the swing cylinder (201) and the leveling cylinder (300).

4. The counterweight hydraulic control device according to claim 2, characterized in that a first flow dividing and collecting valve (400) is connected between the rodless cavities of the swing cylinder (201) and the leveling cylinder (300), and is communicated with the rodless cavity of the passive cylinder (100) through the first flow dividing and collecting valve (400); a second flow dividing and collecting valve (500) is connected between the rod cavities of the swing oil cylinder (201) and the leveling oil cylinder (300), and is communicated with the rod cavity of the passive oil cylinder (100) through the second flow dividing and collecting valve (500).

5. The counterweight hydraulic control device according to claim 4, characterized in that the counterweight hydraulic control device further includes a first balance valve (204) having two first balance oil passages (205), one of the first balance oil passages (205) connecting a rod-less chamber of the swing cylinder (201) and the first split-flow collecting valve (400), and the other of the first balance oil passages (205) connecting a rod-less chamber of the swing cylinder (201) and the second split-flow collecting valve (500).

6. The counterweight hydraulic control device according to claim 5, characterized in that a first check valve (206) and a first relief valve (207) are provided in parallel on the first counterweight oil passage (205), the first check valve (206) being used for supplying oil to the swing cylinder (201) from the passive cylinder (100), and the first relief valve (207) being used for supplying oil to the passive cylinder (100) when the pressure in the swing cylinder (201) reaches a preset pressure.

7. The counterweight hydraulic control device according to claim 4, characterized in that the counterweight hydraulic control device further includes a second balance valve (302) having two second balance oil passages (303), one of the second balance oil passages (303) connecting a rodless chamber of the leveling cylinder (300) and the first split-flow collecting valve (400), and the other of the second balance oil passages (303) connecting a rod chamber of the leveling cylinder (300) and the second split-flow collecting valve (500).

8. The counterweight hydraulic control device according to any one of claims 1 to 7, characterized in that the counterweight hydraulic control device further includes a third balance valve (104) having two third balance oil passages (105), one of the third balance oil passages (105) connecting a tank and a rodless chamber of the passive cylinder (100), and the other of the third balance oil passages (105) connecting the tank and a rod-containing chamber of the passive cylinder (100).

9. The counterweight hydraulic control device according to claim 8, characterized in that the counterweight hydraulic control device further includes a direction valve (600) interposed between the tank and the third balance valve (104), the direction valve (600) having a first working port (a) and a second working port (B) respectively connected in one-to-one correspondence with the two third balance oil passages (105), and being configured to select one of the first working port (a) and the second working port (B) to be connected with a pump oil member connected with the tank.

10. An overhead working truck, characterized in that it comprises a counterweight hydraulic control device according to any one of claims 1 to 9.