CN211059103U - Bridge inspection vehicle and variable-amplitude support leg hydraulic control system thereof - Google Patents
Bridge inspection vehicle and variable-amplitude support leg hydraulic control system thereof Download PDFInfo
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- CN211059103U CN211059103U CN201921851053.9U CN201921851053U CN211059103U CN 211059103 U CN211059103 U CN 211059103U CN 201921851053 U CN201921851053 U CN 201921851053U CN 211059103 U CN211059103 U CN 211059103U
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Abstract
The utility model discloses a bridge inspection vehicle and a luffing support leg hydraulic control system thereof, which comprises an active walking wheel hydraulic motor control valve, a walking motor shuttle valve, a normally closed reversing valve, a luffing support leg control valve, a luffing support leg shuttle valve and a normally open reversing valve; a working oil port of the control valve of the hydraulic motor of the driving travelling wheel is respectively connected with an oil inlet cavity and an oil outlet cavity of the travelling motor; two ends of the normally closed reversing valve are respectively connected with an oil inlet cavity and an oil outlet cavity of the walking motor; the walking motor shuttle valve is connected between a working oil port A and a working oil port B of the active walking wheel hydraulic motor control valve, and is connected with a built-in brake of the walking speed reducer through a normally open reversing valve; the working oil port A, B of the variable-amplitude support leg control valve is respectively connected with the large cavity and the small cavity of the support leg variable-amplitude oil cylinder; the amplitude-variable landing leg shuttle valve is connected between a working oil port A and a working oil port B of the amplitude-variable landing leg control valve, and is connected with a built-in brake of the walking speed reducer through a one-way valve.
Description
Technical Field
The utility model belongs to the technical field of the bridge inspect vehicle, in particular to bridge inspect vehicle and become width of cloth landing leg hydraulic control system thereof.
Background
The landing leg walking is a structural form commonly used by bridge inspection vehicles at present, and the main form is that a hydraulic motor is additionally arranged on a landing leg to drive a landing leg roller so as to realize low-speed walking of the vehicle, and the walking is divided into amplitude-variable landing leg walking and vertical landing leg walking according to the structural form. Compared with the walking of vertical supporting legs, the walking of the amplitude-variable supporting legs has the advantages of small walking swing, good braking performance, better supporting and loading, reduced frame deformation and improved stability of the whole vehicle.
The prior luffing outrigger walking has the following disadvantages: when the amplitude-variable support leg is supported, the walking driving wheel cannot rotate freely to cause hard friction with the ground, the supporting height of the support leg and the service life of the roller are influenced, and meanwhile, the road surface is easy to damage and the stability of the whole vehicle is reduced.
SUMMERY OF THE UTILITY MODEL
The purpose is as follows: in order to overcome the not enough of existence among the prior art, the utility model provides a bridge inspect vehicle and become width of cloth landing leg hydraulic control system thereof.
The technical scheme is as follows: in order to solve the technical problem, the utility model discloses a technical scheme does:
the first aspect provides a variable-amplitude support leg hydraulic control system of a bridge inspection vehicle, which comprises a driving travelling wheel hydraulic motor control valve, a travelling motor shuttle valve, a normally closed reversing valve, a variable-amplitude support leg control valve, a variable-amplitude support leg shuttle valve and a normally open reversing valve;
one of the working oil ports A, B of the hydraulic motor control valve of the driving travelling wheel is connected with an oil inlet cavity of the travelling motor, and the other of the working oil ports A, B of the hydraulic motor control valve of the driving travelling wheel is connected with an oil outlet cavity of the travelling motor; the hydraulic motor control valve is used for controlling the work of the walking motor by operating the driving walking wheel hydraulic motor;
two ends of the normally closed reversing valve are respectively connected with an oil inlet cavity and an oil outlet cavity of the walking motor and are used for bidirectional conduction when the normally closed reversing valve is in an electrified state, so that oil in the two cavities of the walking motor forms a loop;
the traveling motor shuttle valve is connected between a working oil port A and a working oil port B of the active traveling wheel hydraulic motor control valve, and is connected with a built-in brake of the traveling speed reducer through a normally open reversing valve;
one of the working oil ports A, B of the variable-amplitude support leg control valve is connected with the large cavity of the support leg variable-amplitude oil cylinder, and the other of the working oil ports A, B of the variable-amplitude support leg control valve is connected with the small cavity of the support leg variable-amplitude oil cylinder, so that the support leg variable-amplitude oil cylinder extends out and retracts by operating the variable-amplitude support leg control valve, and the support leg is supported or retracted;
the variable-amplitude support leg shuttle valve is connected between the working oil port A and the working oil port B of the variable-amplitude support leg control valve, and is connected with a built-in brake of the walking speed reducer through a one-way valve.
In some embodiments, the normally closed reversing valve is in a two-way cutoff initial position and in a two-way conduction reversing position. The initial position of the normally open reversing valve is in bidirectional conduction, and the reversing position is in bidirectional cutoff.
In some embodiments, the hydraulic control system for the variable-amplitude support leg of the bridge inspection vehicle further comprises a flow distribution and collection valve, the traveling motors comprise a first traveling motor and a second traveling motor, and the flow distribution and collection valve is connected and arranged on the same side of the oil inlet cavity and the oil outlet cavity of the first traveling motor and the second traveling motor and is used for keeping synchronization when the first traveling motor and the second traveling motor rotate forward or backward.
In some embodiments, the hydraulic control system for the luffing support leg of the bridge inspection vehicle further includes a walking motor bidirectional balance valve, and the working oil port A, B of the active walking wheel hydraulic motor control valve is connected with the walking motor through the walking motor bidirectional balance valve.
Further, in some embodiments, the travel motor shuttle valve is built into the travel motor bi-directional balancing valve.
In some embodiments, the hydraulic control system for the luffing outrigger of the bridge inspection vehicle further comprises a bidirectional hydraulic lock, and the two working oil ports A, B of the luffing outrigger control valve are respectively connected with the large cavity and the small cavity of the luffing oil cylinder of the outrigger through the bidirectional hydraulic lock.
Further, in some embodiments, the leg luffing cylinder comprises a first leg luffing cylinder and a second leg luffing cylinder, and the bidirectional hydraulic lock comprises a first bidirectional hydraulic lock and a second bidirectional hydraulic lock; one path of the variable-amplitude support leg control valve is respectively communicated with the large cavity and the small cavity of the first support leg variable-amplitude oil cylinder through a first bidirectional hydraulic lock, and the other path of the variable-amplitude support leg control valve is respectively communicated with the large cavity and the small cavity of the second support leg variable-amplitude oil cylinder through a second bidirectional hydraulic lock.
In a second aspect, the bridge inspection vehicle is further provided, and the bridge inspection vehicle comprises a variable-amplitude support leg hydraulic control system of the bridge inspection vehicle.
The control method of the hydraulic control system of the amplitude variation support leg of the bridge inspection vehicle comprises the following steps:
when the bridge inspection vehicle works, the amplitude-variable supporting leg is supported, before the amplitude-variable supporting leg is supported, the normally closed reversing valve and the normally open reversing valve are simultaneously electrified, the normally closed reversing valve is conducted in two directions, and two cavities of the walking motor form a hydraulic passage; the normally open reversing valve is cut off in two directions to prevent oil from flowing out of the shuttle valve of the walking motor; operating a variable amplitude support leg control valve, enabling oil to enter a large cavity of a support leg variable amplitude oil cylinder, and enabling the support leg variable amplitude oil cylinder to extend out to support a support leg; meanwhile, the amplitude-variable support leg shuttle valve outputs pressure oil, the pressure oil reaches a built-in brake of the walking speed reducer through a one-way valve, and the brake is opened;
when the bridge inspection vehicle finishes working, the amplitude-variable supporting leg is required to be retracted, before the amplitude-variable supporting leg is retracted, the normally closed reversing valve and the normally open reversing valve are simultaneously electrified, the normally closed reversing valve is conducted in a two-way mode, and oil liquid in two cavities of the walking motor forms a loop; the normally open reversing valve is cut off in two directions to prevent oil from flowing out of the shuttle valve of the walking motor; operating the amplitude variation supporting leg control valve, enabling the oil liquid to enter a small cavity of the amplitude variation oil cylinder of the supporting leg, and retracting the amplitude variation oil cylinder of the supporting leg to realize the retracting of the supporting leg; meanwhile, the amplitude-variable support leg shuttle valve outputs pressure oil, the pressure oil reaches a built-in brake of the walking speed reducer through a one-way valve, and the brake is opened;
when the bridge inspection vehicle needs to operate and walk, the normally closed reversing valve and the normally open reversing valve are powered off simultaneously, the normally closed reversing valve is cut off in a two-way mode, and a loop between two cavities of the walking motor is cut off; the normally open reversing valve is conducted in two directions; at the moment, the control valve of the hydraulic motor of the driving travelling wheel is operated, oil enters the two travelling motors, meanwhile, the shuttle valves of the travelling motors output pressure oil, the reversing valves are opened frequently to reach the built-in brakes of the two travelling speed reducers, and the brakes are opened.
Has the advantages that: the utility model provides a bridge inspect vehicle and become width of cloth landing leg hydraulic control system thereof through when the landing leg is propped up or is withdrawed, opens the stopper of walking action wheel speed reducer, makes the walking motor two chambeies form the hydraulic pressure route simultaneously to make walking action wheel and ground change rolling friction into by sliding friction, both prolonged the life of initiative walking wheel, alleviate the destruction that causes the road surface again, still alleviateed rocking of whole car simultaneously, improve the stability of whole car. The system enables the walking driving wheel of the bridge inspection vehicle to freely rotate when the supporting legs are erected or retracted, thereby improving the stress condition of the walking driving wheel and the ground, prolonging the service life of the driving wheel and reducing the damage to the road surface.
Drawings
FIG. 1 is a diagram of a hydraulic control system for a luffing leg of a bridge inspection vehicle according to an embodiment;
in the figure: the device comprises a driving travelling wheel hydraulic motor control valve 1-1, a variable amplitude support leg control valve 1-2, a travelling motor shuttle valve 2-1, a variable amplitude support leg shuttle valve 2-2, a travelling motor bidirectional balance valve 3, a normally closed reversing valve 4, a flow distributing and collecting valve 5 and a travelling motor 6: the first walking motor 6-1, the second walking motor 6-2 and the walking speed reducer are internally provided with a brake 7: a first brake 7-1, a second brake 7-2 and a supporting leg amplitude variation oil cylinder 8: a first support leg amplitude variation oil cylinder 8-1, a second support leg amplitude variation oil cylinder 8-2 and a bidirectional hydraulic lock 9: a first bidirectional hydraulic lock 9-1, a second bidirectional hydraulic lock 9-2, a one-way valve 10 and a normally open reversing valve 11.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may also include different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Example 1
As shown in fig. 1, the hydraulic control system for the amplitude-variable support leg of the bridge inspection vehicle comprises a hydraulic motor control valve 1-1 for an active walking wheel, a shuttle valve 2-1 for a walking motor, a normally closed reversing valve 4, an amplitude-variable support leg control valve 1-2, an amplitude-variable support leg shuttle valve 2-2 and a normally open reversing valve 11;
one of the working oil ports A, B of the driving travelling wheel hydraulic motor control valve 1-1 is connected with an oil inlet cavity of the travelling motor 6, and the other of the working oil ports A, B is connected with an oil outlet cavity of the travelling motor 6; the hydraulic motor control valve 1-1 is used for controlling the work of the walking motor 6 by operating the driving walking wheel;
two ends of the normally closed reversing valve 4 are respectively connected with an oil inlet cavity and an oil outlet cavity of the walking motor 6 and are used for conducting in a two-way mode when the normally closed reversing valve 4 is in an electrified state, so that oil liquid in the two cavities of the walking motor 6 forms a loop;
the traveling motor shuttle valve 2-1 is connected and arranged between a working oil port A and a working oil port B of the driving traveling wheel hydraulic motor control valve 1-1, and the traveling motor shuttle valve 2-1 is connected with a traveling speed reducer built-in brake 7 through a normally open reversing valve 11;
one of the working oil ports A, B of the variable amplitude support leg control valve 1-2 is connected with the large cavity of the support leg variable amplitude oil cylinder 8, and the other of the working oil ports A, B is connected with the small cavity of the support leg variable amplitude oil cylinder 8, and is used for extending and retracting the support leg variable amplitude oil cylinder 8 by operating the variable amplitude support leg control valve 1-2, so that the support leg is supported or retracted;
the variable-amplitude support leg shuttle valve 2-2 is connected and arranged between the working oil port A and the working oil port B of the variable-amplitude support leg control valve 1-2, and the variable-amplitude support leg shuttle valve 2-2 is connected with the built-in brake 7 of the walking speed reducer through the one-way valve 10.
In some embodiments, the normally closed reversing valve 4 is in bidirectional cutoff in the initial position and in bidirectional conduction in the reversing position. The initial position of the normally open reversing valve 11 is in two-way conduction, and the reversing position is in two-way cutoff.
In some embodiments, as shown in fig. 1, the hydraulic control system for a luffing support leg of a bridge inspection vehicle further includes a flow distribution and collection valve 5, the traveling motor 6 includes a first traveling motor 6-1 and a second traveling motor 6-2, and the flow distribution and collection valve 5 is connected and disposed on the same side of both an oil inlet chamber and an oil outlet chamber of the first traveling motor 6-1 and the second traveling motor 6-2, so as to achieve synchronization when the first traveling motor 6-1 and the second traveling motor 6-2 rotate in the forward direction or the reverse direction.
In some embodiments, as shown in fig. 1, the walking reducer built-in brake 7 includes a first brake 7-1 and a second brake 7-2.
In some embodiments, as shown in fig. 1, the hydraulic control system for a luffing leg of a bridge inspection vehicle further includes a walking motor bidirectional balance valve 3, and the working oil port A, B of the driving walking wheel hydraulic motor control valve 1-1 is connected with the walking motor 6 through the walking motor bidirectional balance valve 3.
In some embodiments, as shown in FIG. 1, the travel motor shuttle valve 2-1 is built into the travel motor bi-directional balancing valve 3.
In some embodiments, as shown in fig. 1, the hydraulic control system for a luffing leg of a bridge inspection vehicle further includes a bidirectional hydraulic lock 9, and the two working oil ports A, B of the luffing leg control valve 1-2 are respectively connected with the large cavity and the small cavity of the leg luffing oil cylinder 8 through the bidirectional hydraulic lock 9.
Further, the support leg amplitude variation oil cylinder 8 comprises a first support leg amplitude variation oil cylinder 8-1 and a second support leg amplitude variation oil cylinder 8-2, and the bidirectional hydraulic lock 9 comprises a first bidirectional hydraulic lock 9-1 and a second bidirectional hydraulic lock 9-2; one path of the amplitude-variable supporting leg control valve 1-2 is respectively communicated with the large cavity and the small cavity of the first supporting leg amplitude-variable oil cylinder 8-1 through a first bidirectional hydraulic lock 9-1, and the other path of the amplitude-variable supporting leg control valve is respectively communicated with the large cavity and the small cavity of the second supporting leg amplitude-variable oil cylinder 8-2 through a second bidirectional hydraulic lock 9-2.
Example 2
A bridge inspection vehicle, comprising the hydraulic control system of the variable-amplitude support leg of the bridge inspection vehicle in the embodiment 1.
The control method of the hydraulic control system of the amplitude-variable support leg of the bridge inspection vehicle comprises the following steps: when the bridge inspection vehicle works, the amplitude-variable supporting leg is supported, before the amplitude-variable supporting leg is supported, the normally closed reversing valve 4 and the normally open reversing valve 11 are simultaneously electrified, the normally closed reversing valve 4 is conducted in a bidirectional mode, and two cavities of the walking motor 6 form a hydraulic passage; the normally open reversing valve 11 is cut off in two directions to prevent oil from flowing out of the traveling motor shuttle valve 2-1; operating the amplitude variation supporting leg control valve 1-2, wherein oil enters a large cavity of the amplitude variation oil cylinder 8 of the supporting leg through the bidirectional hydraulic lock 9, and the amplitude variation oil cylinder 8 of the supporting leg extends out to realize supporting of the supporting leg; meanwhile, pressure oil is output by the amplitude-variable support leg shuttle valve 2-2 and reaches the built-in brake 7 of the two walking speed reducers through the one-way valve 10, and the brake is opened; when the road wheels below the supporting legs contact the ground, the road wheels can rotate freely under the friction force of the ground.
When the bridge inspection vehicle finishes working, the amplitude-variable supporting leg is required to be retracted, before the amplitude-variable supporting leg is retracted, the normally closed reversing valve 4 and the normally open reversing valve 11 are simultaneously electrified, the normally closed reversing valve 4 is conducted in a two-way mode, and oil and liquid in two cavities of the walking motor form a loop; the normally open reversing valve 11 is cut off in two directions to prevent oil from flowing out of the traveling motor shuttle valve 2-1; operating the amplitude variation supporting leg control valve 1-2, wherein oil enters a small cavity of the amplitude variation oil cylinder 8 of the supporting leg through the bidirectional hydraulic lock 9, and the amplitude variation oil cylinder 8 of the supporting leg retracts to realize the retraction of the supporting leg; meanwhile, pressure oil is output by the amplitude-variable support leg shuttle valve 2-2 and reaches the built-in brake 7 of the two walking speed reducers through the one-way valve 10, and the brake is opened; the walking wheels below the supporting legs can freely rotate when being subjected to ground friction before leaving the ground;
before the bridge inspection vehicle needs to operate and walk, the normally closed reversing valve 4 and the normally open reversing valve 11 are powered off simultaneously, the normally closed reversing valve 4 is cut off in a two-way mode, and a loop between two cavities of the walking motor 6 is cut off; the normally open reversing valve 11 is conducted in two directions; at the moment, the control valve 1-1 of the hydraulic motor of the driving travelling wheel is operated, oil enters the two travelling motors 6 through the bidirectional balance valve 3 of the travelling motors, and the flow dividing and collecting valve 5 can realize flow dividing or collecting according to the ratio of 1:1 through the flow of the two motors, so that the two travelling motors can be ensured to synchronously run, and the slippage is effectively avoided; meanwhile, the traveling motor shuttle valve 2-1 arranged in the traveling motor bidirectional balance valve 3 outputs pressure oil which often opens the reversing valve 11 to reach the built-in brake 7 of the two traveling speed reducers, and the brake is opened; at the moment, the walking driving wheel rotates under the driving of the walking motor 6, and the low-speed walking of the vehicle is realized.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered limiting with respect to the scope of the present invention.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (9)
1. A hydraulic control system for a variable-amplitude support leg of a bridge inspection vehicle is characterized by comprising a hydraulic motor control valve (1-1) of a driving travelling wheel, a travelling motor shuttle valve (2-1), a normally closed reversing valve (4), a variable-amplitude support leg control valve (1-2), a variable-amplitude support leg shuttle valve (2-2) and a normally open reversing valve (11);
one of the working oil ports A, B of the driving travelling wheel hydraulic motor control valve (1-1) is connected with an oil inlet cavity of the travelling motor (6), and the other of the working oil ports A, B is connected with an oil outlet cavity of the travelling motor (6); the hydraulic motor control valve (1-1) is used for controlling the work of the walking motor (6) by operating the driving walking wheel;
two ends of the normally closed reversing valve (4) are respectively connected with an oil inlet cavity and an oil outlet cavity of the walking motor (6) and are used for bidirectional conduction when the normally closed reversing valve (4) is in an electrified state, so that oil in the two cavities of the walking motor (6) forms a loop;
the traveling motor shuttle valve (2-1) is connected and arranged between a working oil port A and a working oil port B of the driving traveling wheel hydraulic motor control valve (1-1), and the traveling motor shuttle valve (2-1) is connected with a traveling speed reducer built-in brake (7) through a normally open reversing valve (11);
one of the working oil ports A, B of the variable amplitude support leg control valve (1-2) is connected with the large cavity of the support leg variable amplitude oil cylinder (8), and the other of the working oil ports A, B is connected with the small cavity of the support leg variable amplitude oil cylinder (8) and is used for extending and retracting the support leg variable amplitude oil cylinder (8) by operating the variable amplitude support leg control valve (1-2), so that the support leg is supported or retracted;
the variable-amplitude support leg shuttle valve (2-2) is connected and arranged between the working oil port A and the working oil port B of the variable-amplitude support leg control valve (1-2), and the variable-amplitude support leg shuttle valve (2-2) is connected with a built-in brake (7) of the walking speed reducer through a one-way valve (10).
2. The hydraulic control system for the amplitude-variable support leg of the bridge inspection vehicle according to claim 1, wherein the normally-closed reversing valve (4) is in bidirectional cutoff at an initial position and in bidirectional conduction at a reversing position.
3. The hydraulic control system for the amplitude-variable support leg of the bridge inspection vehicle according to claim 1, wherein the normally-open reversing valve (11) is in bidirectional conduction at an initial position and is in bidirectional cutoff at a reversing position.
4. The hydraulic control system for the amplitude-variable support leg of the bridge inspection vehicle is characterized by further comprising a flow distribution and collection valve (5), wherein the walking motor (6) comprises a first walking motor (6-1) and a second walking motor (6-2), and the flow distribution and collection valve (5) is connected and arranged on the same side of an oil inlet cavity and an oil outlet cavity of the first walking motor (6-1) and the second walking motor (6-2) and used for keeping synchronization when the first walking motor (6-1) and the second walking motor (6-2) rotate in the forward direction or the reverse direction.
5. The hydraulic control system for the amplitude-variable support leg of the bridge inspection vehicle according to claim 1, further comprising a walking motor bidirectional balance valve (3), wherein the working oil port A, B of the driving walking wheel hydraulic motor control valve (1-1) is connected with the walking motor (6) through the walking motor bidirectional balance valve (3).
6. The hydraulic control system for the luffing leg of a bridge inspection vehicle according to claim 5, wherein the walking motor shuttle valve (2-1) is built into the walking motor bidirectional balancing valve (3).
7. The hydraulic control system for the amplitude-variable support leg of the bridge inspection vehicle according to claim 1, further comprising a bidirectional hydraulic lock (9), wherein the two working oil ports A, B of the amplitude-variable support leg control valve (1-2) are respectively connected with the large cavity and the small cavity of the amplitude-variable support leg oil cylinder (8) through the bidirectional hydraulic lock (9).
8. The hydraulic control system for the amplitude-variable landing leg of the bridge inspection vehicle according to claim 7, wherein the landing leg amplitude-variable oil cylinder (8) comprises a first landing leg amplitude-variable oil cylinder (8-1) and a second landing leg amplitude-variable oil cylinder (8-2), and the bidirectional hydraulic lock (9) comprises a first bidirectional hydraulic lock (9-1) and a second bidirectional hydraulic lock (9-2); one path of the amplitude-variable supporting leg control valve (1-2) is respectively communicated with the large cavity and the small cavity of the first supporting leg amplitude-variable oil cylinder (8-1) through a first bidirectional hydraulic lock (9-1), and the other path of the amplitude-variable supporting leg control valve is respectively communicated with the large cavity and the small cavity of the second supporting leg amplitude-variable oil cylinder (8-2) through a second bidirectional hydraulic lock (9-2).
9. A bridge inspection vehicle comprising a variable amplitude leg hydraulic control system of the bridge inspection vehicle of any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921851053.9U CN211059103U (en) | 2019-10-31 | 2019-10-31 | Bridge inspection vehicle and variable-amplitude support leg hydraulic control system thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921851053.9U CN211059103U (en) | 2019-10-31 | 2019-10-31 | Bridge inspection vehicle and variable-amplitude support leg hydraulic control system thereof |
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| CN211059103U true CN211059103U (en) | 2020-07-21 |
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| CN201921851053.9U Active CN211059103U (en) | 2019-10-31 | 2019-10-31 | Bridge inspection vehicle and variable-amplitude support leg hydraulic control system thereof |
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| CN (1) | CN211059103U (en) |
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- 2019-10-31 CN CN201921851053.9U patent/CN211059103U/en active Active
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