CN218206686U - Grab arm structure and engineering trolley - Google Patents

Abstract

The utility model provides a grab arm structure and an engineering trolley, wherein the grab arm structure comprises a connecting seat, the connecting seat comprises a first mounting station and a second mounting station, and the first mounting station is used for being connected with an arm frame of the engineering trolley; a first drive structure connected to the connected second mounting station; the gripper assembly is connected to the first driving structure and is driven by the first driving structure to perform rotary motion; the gripper assembly at least comprises a gripping structure and a second driving structure connected with the gripping structure, and the second driving structure can drive the gripping structure to swing so as to adjust the gripping operation surface of the gripping structure. The utility model discloses an improve the operation face that snatchs of snatching the structure to overcome the problem that needs a plurality of tongs of installation among the prior art, thereby optimize the structure of whole car, reduce the fault rate of equipment, reduce equipment purchase cost and maintenance cost.

Description

Grab arm structure and engineering trolley

Technical Field

The utility model relates to an engineering platform truck grabs arm technical field particularly, relates to a grab arm structure and engineering platform truck.

Background

The engineering trolley is important equipment for tunnel construction. The gripper or the gripper arm is an important component of the engineering trolley, and the gripping operation is often required under the condition of difficult construction environment. However, the prior art gripper or gripper arm structure can only grip in one side elevation direction, and when an object in another direction needs to be gripped, another set of gripper arm device needs to be configured. Therefore, the structure installation is very complicated, the size of the whole structure is increased, the whole layout is not facilitated, hydraulic and electric pipelines are increased, and the failure rate and the risk points of the equipment are improved. And a set of grabbing arm structure is additionally arranged, so that the equipment purchasing cost and the maintenance cost are increased.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least.

Therefore, the utility model provides a grab arm structure.

The utility model discloses the second aspect provides an engineering trolley.

The utility model provides a grab arm structure, include:

the connecting base comprises a first mounting station and a second mounting station, wherein the first mounting station is used for being connected with an arm support of the engineering trolley;

a first drive structure connected to the connected second mounting station;

the gripper assembly is connected to the first driving structure and is driven by the first driving structure to perform rotary motion;

the gripper assembly at least comprises a gripping structure and a second driving structure connected with the gripping structure, and the second driving structure can drive the gripping structure to swing so as to adjust the gripping operation surface of the gripping structure.

The utility model provides a grab arm structure, constitute including connecting seat, first drive structure, tongs assembly. The first installation station formed by the connecting seat is used for being connected with a support arm of the engineering trolley and synchronously moving along with the support arm, so that the requirement of a working face is met, wherein the first installation station comprises a first installation point and a second installation point, the first installation point is hinged with the end part of an arm support of the engineering trolley, the second installation point is hinged with the multi-link mechanism, and the multi-link mechanism is driven by an oil cylinder and drives the grabbing arm structure to perform pitching motion. The second mounting station is used for mounting a first driving structure, and the first driving structure can drive the gripper assembly to perform rotary motion along the radial direction of the gripper assembly so as to meet the requirement that the gripper assembly needs to rotate in the radial direction. On the basis, the gripper assembly at least comprises a gripping structure and a second driving structure. Wherein the grabbing structure is used for grabbing construction materials, such as steel plates and the like. The second driving structure can drive the grabbing structure to swing, so that the grabbing structure can grab or place materials on one side of the vehicle body and can swing to the other side of the vehicle body to grab or place the materials on the side. The utility model discloses an improve the operation face that snatchs of snatching the structure to overcome the problem that needs a plurality of tongs of installation among the prior art, thereby optimize the structure of whole car, reduce the fault rate of equipment, reduce equipment purchase cost and maintenance cost.

According to the utility model discloses above-mentioned technical scheme's grab arm structure can also have following additional technical characterstic:

in the above technical solution, the grasping structure includes:

the connecting arm is connected to the first driving structure and is driven by the first driving structure to do rotary motion;

the connecting frame is hinged with the end part of the connecting arm;

the swing plate is provided with one end which forms a hinge structure with the connecting frame and the other end which forms a hinge structure with the driving end of the second driving structure so as to be driven by the second driving structure to swing;

and the gripper is arranged on the swinging plate and swings synchronously along with the swinging plate.

In the technical scheme, the grabbing structure consists of a connecting arm, a connecting frame, a swinging plate and a gripper. The connecting arm is used as a connecting and transmission structure, and linkage with the first driving structure is guaranteed. The connecting frame and one end of the swinging plate form a hinge structure so as to adapt to the swinging action of the swinging plate. The swinging plate serves as a main body of swinging motion and can be driven by the second driving structure, so that the connecting point of the swinging plate and the connecting frame serves as a swinging center, swinging motion is carried out to a large extent, the grippers are further driven to synchronously swing to a large extent, and the positions of the grippers are changed, so that the grabbing or placing process of construction materials on two sides of the vehicle body is met. It should be noted that the rotating handle may be a mechanical handle structure in the prior art, and the specification or the model may be selected according to the actual working condition, which is not specifically limited herein. The second driving structure can be a hydraulic cylinder, an air cylinder or an electric push rod and the like. The structure has strong linkage, and the structure is directly connected, so that the driving force of the second driving structure can be utilized to a greater extent, and the kinetic energy loss is reduced.

In the above technical solution, the mobile terminal further includes a third driving structure, one end of the third driving structure is hinged to the side wall of the connecting arm, the other end of the third driving structure is hinged to the connecting frame, wherein a first hinge point is arranged at an end of the connecting arm, the connecting frame forms a hinge structure with the end of the connecting arm at the first hinge point, and the connecting frame is allowed to be driven by the third driving structure and swing along the first direction in the assembling mode.

In this technical scheme, because the link forms the hinge structure with the linking arm tip at first pin joint, consequently the link can be driven by third drive structure and along the swing of first direction, and the swing board can carry out the swing of first direction in step simultaneously to improve the flexibility of swing action, and improve the variability of working face in step. Wherein the first direction is defined as a direction perpendicular to the swing direction. In addition, above-mentioned structure is when being snatched the material overweight, snatchs the structure promptly and receives when the effort with swing direction asynchronous, through the swing of link first direction, drives and snatchs the motion of structure in this direction in order to adapt to above-mentioned effort, avoids this part effort and the drive power of second drive structure to contradict each other or conflict, and then alleviates the consumption of second drive structure drive power.

In the above technical solution, a second hinge point is disposed at an end of the connecting frame, one end of the swing plate is hinged to the connecting frame at the second hinge point, a third hinge point is disposed at the other end of the swing plate, a driving end of the second driving structure is hinged to the swing plate at the third hinge point, and the second driving structure is allowed to drive the swing plate to swing in the second direction in this assembly manner.

In this technical scheme, when the swing board swings the action, because the one end of swing board forms the hinge structure with the link at the second pin joint to allow this end of swing board to swing along the second direction, in order to lead the swing direction to swing the board, avoid the swing action skew, and then improve and snatch the structure and snatch the accurate nature of action. The third hinge joint point is not only used as a connection point of the second driving structure and the swinging plate, so that the second driving structure and the swinging plate are stably connected; and also as a driving point, ensuring that the second driving structure performs driving action at the point so as to complete the swinging action of the swinging plate. The third junction point and the second junction point ensure the flexibility of two ends of the swinging plate, reduce the obstruction of swinging action and improve the smoothness and stability of the swinging action.

In the above technical solution, the second hinge point is a fixed point, the third hinge point is a dynamic point, and when the driving end of the second driving structure drives the swing plate to swing through the third hinge point, the third hinge point performs arc motion with the second hinge point as a center of circle, so as to satisfy the swing motion of the swing plate.

In this solution, the second hinge point and the third hinge point form a cooperation to allow and limit the occurrence of the swinging motion. In addition, the second hinge point is a fixed point, namely a swing center, and the center position of the swing is determined, and the third hinge point is a dynamic point, namely the maximum diameter of the swing is determined, so that an operator can know the grabbing area of the grabbing structure according to the data and adjust the grabbing area according to the actual working condition, and the operation quality and the operation efficiency are improved.

In the above technical scheme, the other end of the second driving structure is hinged to the side wall of the connecting frame, the second driving structure, the connecting frame and the swinging plate form a triangular structure, and the shape of the triangular structure is changed along with the driving process of the second driving structure.

In this technical scheme, second drive structure, link and swing board form the triangle-shaped structure to improve the stability that the three are connected. And when the second driving structure is driven, even if the area of the triangular structure can be synchronously changed, the structure is still maintained, so that the second driving structure is stably supported.

In the above technical solution, the first driving structure includes:

a rotary driver connected to a second mounting station of the connecting base;

the rotary arm is connected to the rotary driver, wherein the connecting arm is connected with the rotary arm in a telescopic sleeve mode so as to adapt to the rotary motion of the rotary arm.

In the technical scheme, the first driving structure is composed of a rotary driver and a rotary arm. And the rotary driver selects the model or the specification according to the actual working condition. The rotary driver adopted in the embodiment of the present invention is a component known to those skilled in the art, and it can be obtained commercially, and the specific structure and model thereof are not limited herein. The rotary driver is used for driving the rotary arm to rotate, and then drives the gripper structure to rotate so as to realize rotary motion of the gripper structure.

In the above technical solution, the method further comprises:

and the limiting structure is arranged on the gripper assembly to limit the movement of the gripped material.

In this technical scheme, still include limit structure. The limiting structure is used for limiting the position of the grabbed material and preventing the grabbed material from shaking in the transferring process. In particular, the limiting structure may be a structure of a plurality of pairs of limiting blocks or limiting plates which are assembled to both sides of the swing plate in an opposite structure, and the gripped material is located in the middle of the limiting structure to be locked or fixed. In addition, the limiting blocks or the limiting plates can also form a structure with adjustable space, and the specific selection is not repeated due to more structures with adjustable space in the prior art.

The utility model also provides an engineering platform truck includes at least:

one or more arm supports connected to a body of the engineering trolley;

the grab arm structure of any one of the above technical solutions is connected to the arm support.

The utility model provides a pair of engineering platform truck has above-mentioned all beneficial effects of grabbing the arm structure, no longer gives unnecessary details here.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a perspective view of the gripping arm structure of the present invention;

fig. 2 is a schematic structural view of the swing plate, the gripper and the limiting structure in the gripper arm structure of the present invention.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 2 is:

1. a connecting seat; 101. a first mounting station; 102. a second mounting station; 2. a boom; 3. a first drive structure; 301. a slew driver; 302. a swivel arm; 4. grabbing the structure; 401. a connecting arm; 4011. A first hinge point; 402. a connecting frame; 4021. a second hinge point; 403. a swing plate; 4031. a third hinge point; 404. a gripper; 5. a second drive structure; 6. a limiting structure; 7 a third drive configuration.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A grab arm structure and a mobile workbench according to some embodiments of the present invention are described below with reference to fig. 1 and 2.

Some embodiments of the present application provide a grab arm structure.

As shown in fig. 1, a first embodiment of the present invention provides a gripping arm structure, including:

the connecting device comprises a connecting seat 1, wherein the connecting seat 1 comprises a first mounting station 101 and a second mounting station 102, and the first mounting station 101 is used for being connected with an arm frame 2 of an engineering trolley;

a first drive structure 3 connected to said connected second mounting station 102;

the gripper assembly is connected to the first driving structure 3 and is driven by the first driving structure 3 to perform rotary motion;

the gripper assembly at least comprises a gripping structure 4 and a second driving structure 5 connected with the gripping structure, and the second driving structure 5 can drive the gripping structure 4 to swing so as to adjust the gripping operation surface of the gripping structure 4.

The utility model provides an oscillating tongs 404 structure, constitute including connecting seat 1, first drive structure 3, tongs assembly. The first installation station 101 formed by the connecting seat 1 is used for being connected with a support arm of an engineering trolley and moving synchronously along with the support arm, so that the requirement of an operation surface is met, wherein the first installation station 101 comprises a first installation point position and a second installation point position, the first installation point position is hinged with the end part of an arm frame 2 of the engineering trolley, the second installation point position is hinged with a multi-link mechanism, and the multi-link mechanism is driven by an oil cylinder and drives the grabbing arm structure to perform pitching motion. The second mounting station 102 is used for mounting the first driving structure 3, and the first driving structure 3 can drive the gripper assembly to perform a revolving motion along the radial direction of the gripper assembly, so as to meet the condition that the gripper assembly needs to rotate in the radial direction. On the basis of the above, the gripper assembly is composed of at least a gripping structure 4 and a second driving structure 5. The gripping structure 4 is used for gripping construction materials, such as steel plates. The second driving structure 5 can drive the grabbing structure 4 to swing, so that the grabbing structure can grab or place the material on one side of the vehicle body and can swing to the other side of the vehicle body to grab or place the material on the side. The utility model discloses an improve the operation face that snatchs of snatching structure 4 to overcome the problem that needs a plurality of tongs 404 of installation among the prior art, thereby optimize the structure of whole car, reduce the fault rate of equipment, reduce equipment purchase cost and maintenance cost.

The utility model discloses a second embodiment provides a grab arm structure, and on the basis of first embodiment, it includes to snatch structure 4:

a connecting arm 401 connected to the first driving structure 3 and driven by the first driving structure 3 to make a revolving motion;

the connecting frame 402 is hinged with the end part of the connecting arm 401;

a swing plate 403, one end of which forms a hinge structure with the connecting frame 402, and the other end of which forms a hinge structure with the driving end of the second driving structure, so as to be driven by the second driving structure 5 and perform swing motion;

and a gripper 404 provided on the swing plate 403 and swinging synchronously with the swing plate 403.

In the present embodiment, the grasping configuration 4 is constituted by a connecting arm 401, a connecting frame 402, a swinging plate 403, and a grasping hand 404. The connecting arm 401 serves as a connecting and transmission structure, ensuring linkage with the first driving structure 3. The connecting frame 402 and one end of the swing plate 403 form a hinge structure to accommodate the swing action of the swing plate 403. The swing plate 403 is used as a main body of swing motion and can be driven by the second driving structure 5, so that a connection point with the connection frame 402 is used as a swing center to perform a large swing motion, and further the grippers 404 are driven to synchronously swing to a large extent, thereby changing the positions of the grippers 404 to meet the grabbing or placing process of construction materials on two sides of the vehicle body. It should be noted that the rotating handle may be a mechanical handle 404 in the prior art, and the specification or the model may be selected according to the actual working condition, which is not specifically limited herein. The second driving structure 5 may be a hydraulic cylinder, an air cylinder or an electric push rod. The structure has strong linkage and direct structural connection, and can utilize the driving force of the second driving structure 5 to a greater extent and reduce the kinetic energy loss.

The utility model discloses a third embodiment provides a grab arm structure, and on the basis of above-mentioned arbitrary embodiment, still includes third drive structure 7, one end with the lateral wall of linking arm 401 is articulated, the other end with link 402 is articulated, wherein, the tip of linking arm 401 sets up first pin joint 4011, link 402 is in first pin joint 4011 forms the hinge structure with linking arm 401 tip to allow with this assembly form link 402 is along the first direction swing.

In this embodiment, since the link frame 402 forms a hinge structure with the end of the link arm 401 at the first hinge point 4011, the link frame 402 is driven by the third driving structure 7 and swings in the first direction, and the swing plate 403 can synchronously swing in the first direction, so that the flexibility of the swing motion is improved, and the versatility of the working surface is synchronously improved. Wherein the first direction is defined as a direction perpendicular to the swing direction. In addition, when the above-mentioned structure is snatched the material overweight, snatch when structure 4 receives the effort with swing direction asynchronous promptly, through the swing of link 402 first direction, drive and snatch the motion of structure 4 in this direction in order to adapt to above-mentioned effort, avoid this part effort and the drive power of second drive structure 5 conflict each other or conflict, and then alleviate the consumption of second drive structure 5 drive power.

The fourth embodiment of the present invention provides a grasping arm structure, and on the basis of any of the above embodiments, the end of the connecting frame 402 is provided with a second hinge point 4021, one end of the swinging plate 403 is hinged to the second hinge point 4021 with the connecting frame 402, and the swinging plate 403 swings along the second direction in this assembling form.

In this embodiment, when the swing plate 403 performs the swing action, since one end of the swing plate 403 forms a hinge structure with the connecting frame 402 at the second hinge point 4021 and allows the end of the swing plate 403 to swing in the second direction, the swing direction of the swing plate 403 is guided, the swing action is prevented from being deviated, and the precision of the grabbing action of the grabbing structure 4 is improved.

The utility model discloses a fifth embodiment provides a grab arm structure, and on the basis of any above-mentioned embodiment, the other end of swinging plate 403 sets up third hinge point 4031, second drive structure 5's drive end with swinging plate 403 is in third hinge point 4031 is articulated, wherein, third hinge point 4031 is as the drive point, allows second drive structure 5 drive this end of swinging plate 403 is along the swing of second direction.

In the present embodiment, the third hinge point 4031 not only serves as a connection point between the second driving structure 5 and the swing plate 403, but also ensures stable connection therebetween; also as a driving point, the second driving mechanism 5 is guaranteed to perform a driving action at this point to complete the swinging action of the swinging plate 403. The third and second junctions ensure flexibility at both ends of the swing plate 403, reduce the resistance to the swing motion, and improve the smoothness and stability of the swing motion.

The utility model discloses a sixth embodiment provides a grab arm structure, and on the basis of above-mentioned arbitrary embodiment, second pin joint 4021 is the fixed point, third pin joint 4031 is dynamic point, works as the drive end of second drive structure 5 is driven by third pin joint 4031 during the swing of swing plate 403, third pin joint 4031 uses second pin joint 4021 to do arc motion as the centre of a circle, in order to satisfy swing plate 403's swing action.

In this embodiment, the second hinge point 4021 and the third hinge point 4031 form a fit to allow and limit the swinging motion to occur. In addition, the second hinge point 4021 is a fixed point, i.e., a swing center, which determines a center position where swing occurs, and the third hinge point 4031 is a dynamic point, i.e., which determines a maximum diameter of swing, which ensures that an operator knows the grabbing area of the grabbing structure 4 according to the data and adjusts the grabbing area according to actual conditions, thereby improving operation quality and efficiency.

The utility model discloses a seventh embodiment provides a grab arm structure, and on the basis of any above-mentioned embodiment, the other end of second drive structure 5 is articulated with the lateral wall of link 402, just second drive structure 5, link 402 and swing board 403 form the triangle-shaped structure, the shape of triangle-shaped structure is followed second drive structure 5's drive process and is changed.

In the present embodiment, the second driving structure 5, the connecting frame 402 and the swing plate 403 form a triangular structure to improve the stability of the connection of the three. And when the second driving structure 5 is driven, even if the areas of the triangular structures are changed synchronously, the structures are still maintained, so that the second driving structure 5 is stably supported.

The utility model discloses the eighth embodiment provides a grab arm structure, and on the basis of above-mentioned arbitrary embodiment, first drive structure 3 includes:

a rotary driver 301 connected to the second mounting station 102 of the connecting socket 1;

a swivel arm 302 connected to the swivel drive 301, wherein the connecting arm 401 is connected to the swivel arm 302 by means of a telescopic sleeve to adapt to the swiveling movement of the swivel arm 302.

In the present embodiment, the first drive structure 3 is constituted by a swing drive 301 and a swing arm 302. The rotary driver 301 selects the model or specification according to the actual working condition. The embodiment of the present invention provides a rotary actuator 301, which is a component known to those skilled in the art, and can be obtained by commercial purchase without limiting its specific structure and model. The rotary actuator 301 is used for driving the rotary arm 302 to rotate, so as to drive the gripper 404 to rotate, thereby realizing the rotary motion of the gripper 404.

As shown in fig. 2, a ninth embodiment of the present invention provides a grab arm structure, and on the basis of any of the above embodiments, the grab arm structure further includes:

and the limiting structure 6 is arranged on the gripper assembly to limit the movement of the gripped material.

In this embodiment, a position limiting structure 6 is further included. Limiting structure 6 is used for limiting the position of the material to be grabbed and avoiding shaking in the transfer process. Specifically, the limiting structure 6 may be a structure of a plurality of pairs of limiting blocks or limiting plates, which are assembled to both sides of the swing plate 403 in an opposite structure, and the caught material is located in the middle of the limiting structure to be locked or fixed. In addition, the limiting blocks or the limiting plates can also form a structure with adjustable space, and the specific selection is not repeated due to more structures with adjustable space in the prior art.

The utility model discloses the tenth embodiment provides an engineering platform truck (not shown in the figure), includes at least:

one or more arm supports connected to a body of the engineering trolley;

the grab arm structure of any one of the above technical solutions is connected to the arm support.

The utility model provides a pair of engineering platform truck has above-mentioned all beneficial effect of grabbing the arm structure, no longer gives unnecessary details here.

In this specification, the schematic representations of the terms used above do not necessarily refer 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.

Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A grab arm structure, comprising:

the connecting device comprises a connecting seat (1), wherein the connecting seat (1) comprises a first mounting station (101) and a second mounting station (102), and the first mounting station (101) is used for being connected with an arm support (2) of the engineering trolley;

a first drive structure (3) connected to the second mounting station (102);

the gripper assembly is connected to the first driving structure (3) and is driven by the first driving structure (3) to perform rotary motion;

the gripper assembly at least comprises a gripping structure (4) and a second driving structure (5) connected with the gripping structure, and the second driving structure (5) can drive the gripping structure (4) to swing so as to adjust the gripping operation surface of the gripping structure (4).

2. Gripper arm structure according to claim 1, characterized in that the gripper structure (4) comprises:

a connecting arm (401) connected to the first drive structure (3) and driven by the first drive structure (3) to perform a swivelling movement;

the connecting frame (402) is hinged with the end part of the connecting arm (401);

a swing plate (403), one end of which forms a hinge structure with the connecting frame (402), and the other end of which forms a hinge structure with the driving end of the second driving structure, so as to be driven by the second driving structure (5) and swing;

and a gripper (404) which is provided to the swing plate (403) and swings synchronously with the swing plate (403).

3. The grab arm structure of claim 2, further comprising:

and a third driving structure (7), one end of which is hinged with the side wall of the connecting arm (401), and the other end of which is hinged with the connecting frame (402), wherein the end part of the connecting arm (401) is provided with a first hinge point (4011), the connecting frame (402) forms a hinge structure with the end part of the connecting arm (401) at the first hinge point (4011), and the connecting frame (402) is allowed to be driven by the third driving structure (7) and swing along the first direction in the assembling mode.

4. Gripper arm structure according to claim 3, characterized in that the end of the link (402) is provided with a second hinge point (4021), that one end of the swing plate (403) is hinged to the link (402) at the second hinge point (4021), that the other end of the swing plate (403) is provided with a third hinge point (4031), and that the driving end of the second driving structure (5) is hinged to the swing plate (403) at the third hinge point (4031) and in this assembled form allows the second driving structure (5) to drive the swing plate (403) to swing in the second direction.

5. Gripper arm structure according to claim 4, characterized in that the other end of the second driving structure (5) is hinged with a side wall of the connecting frame (402), and the second driving structure (5), the connecting frame (402) and the swing plate (403) form a triangular structure, the shape of which follows the driving process of the second driving structure (5).

6. Gripper arm structure according to claim 5, characterized in that the first drive structure (3) comprises:

a rotary driver (301) connected to a second mounting station (102) of the connecting socket (1);

a swivel arm (302) connected to the swivel drive (301), wherein the connecting arm (401) is connected to the swivel arm (302) by means of a telescopic sleeve.

7. The grab arm structure of any of claims 1 to 6, further comprising:

and the limiting structure (6) is arranged on the gripper assembly to limit the movement of the gripped material.

8. The grab arm structure of any of claims 1 to 6,

the first installation station (101) comprises a first installation point position and a second installation point position, the first installation point position is hinged to the end portion of the arm support (2) of the engineering trolley, the second installation point position is hinged to the multi-link mechanism, and the multi-link mechanism is driven by the oil cylinder and drives the grabbing arm structure to perform pitching motion.

9. A mobile workbench, comprising:

one or more arm supports connected to a body of the engineering trolley;

the grab arm structure of any of claims 1-8, connected to the boom.

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