CN112722736A

CN112722736A - U-rib stacker-reclaimer

Info

Publication number: CN112722736A
Application number: CN202011632294.1A
Authority: CN
Inventors: 高兴; 舒先庆; 陈积里; 石灿; 姚艺强; 吴巧书
Original assignee: Wuhan Lixin Automation Technology Co ltd
Current assignee: Wuhan Lixin Automation Technology Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-04-30
Anticipated expiration: 2040-12-31
Also published as: CN112722736B

Abstract

The invention discloses a U-rib stacker-reclaimer, which comprises a walking part, a transverse moving part and a lifting part, wherein the walking part is arranged on the walking part; the walking part is provided with a walking track, and the walking part can move on the walking track along the length direction of the U rib; the transverse moving part is arranged on the walking part and can move on the walking part along the direction vertical to the length direction of the U rib; the lifting part is arranged on the transverse moving part and can move up and down on the transverse moving part along the vertical direction; the lifting part acts on one end of the U rib through the respective movement of the traveling part, the transverse moving part and the lifting part, and the stacking operation is completed. This U rib stacker-reclaimer can solve all sorts of drawbacks that can only bring through manual operation overhead traveling crane among the prior art to through the setting of control procedure, can realize full automatic identification and unmanned operation, improve work efficiency greatly, and can reduce the human cost.

Description

U-rib stacker-reclaimer

Technical Field

The invention relates to the technical field of hoisting and transportation, in particular to a U-rib stacker-reclaimer.

Background

The steel box girder is an important component in a bridge bearing structure and is mainly used for providing support and avoiding bridge deformation. The steel box girder is generally formed by welding a U rib and a bottom plate.

Because the steel box girder often needs a lot of U ribs in the processing and manufacturing, the length of the general U rib is 12-20 meters, the storage space is saved on site, the U ribs of the same specification are piled up and stacked, the gap between the upper U rib and the lower U rib is small, the self weight of the U rib is large, at present, no automatic equipment special for loading and unloading the U ribs exists, usually, the U ribs are manually taken down one by one through operating a crown block to be placed on a bottom plate or other process equipment before welding when the welding is needed, the labor cost in the production of the steel box girder is high, and the working efficiency is very low.

Therefore, how to efficiently solve the problem of taking or stacking the U-shaped ribs is a technical problem to be solved by the technical personnel in the field.

Disclosure of Invention

Aiming at the defects of the prior art, the invention discloses a U-rib stacker-reclaimer which can realize the high-efficiency material taking or stacking operation of U ribs and greatly improve the overall working efficiency in the welding operation of steel box girders.

The invention aims to be realized by the following technical scheme, and the U-rib stacker-reclaimer is used for stacking or extracting U ribs and comprises a walking part, a transverse moving part and a lifting part; the walking part is provided with a walking track, and the walking part can move on the walking track along the length direction of the U rib; the transverse moving part is arranged on the walking part and can move on the walking part along the direction vertical to the length direction of the U rib; the lifting part is arranged on the transverse moving part and can move up and down on the transverse moving part along the vertical direction; the lifting part acts on one end of the U rib through the respective movement of the traveling part, the transverse moving part and the lifting part, and the stacking operation is completed.

Further, the walking part comprises a walking base and a cross beam; the two walking bases are respectively arranged at two ends of the cross beam; the walking base is provided with a walking driving device and walking wheels, and the walking wheels are driven by the walking driving device to travel along the walking track.

Further, the transverse moving part comprises a vertical beam, a transverse moving guide rail and a transverse moving slide seat fixed on the vertical beam;

the vertical beam is movably connected to the walking part through the transverse sliding seat;

the transverse moving guide rail is a linear guide rail and is horizontally and fixedly arranged on the walking part along the running direction vertical to the walking part;

the transverse sliding seat is matched with the transverse sliding guide rail and is in sliding connection with the transverse sliding guide rail.

Further, the transverse moving part also comprises a transverse moving driving device and a transverse moving rack;

the transverse moving driving device is fixedly arranged on the vertical beam, and the transverse moving rack is horizontally and fixedly arranged on the transverse moving part;

the transverse moving driving device is in transmission connection with a transverse moving gear, and the transverse moving gear is matched with and in transmission connection with the transverse moving rack;

the vertical beam can horizontally move along the traverse guide rail under the driving of the traverse driving device.

Further, the lifting part comprises a lifting driving device, a lifting seat, a lifting guide rail and a material taking plate;

the lifting driving device is fixedly arranged on the transverse moving part and is in transmission connection with the lifting seat;

the lifting guide rail is a linear guide rail and is fixedly arranged on the transverse moving part along the vertical direction;

the lifting seat is matched and in sliding connection with the lifting guide rail;

the material taking plate is fixedly connected to the lifting seat and used for being inserted into the lower side of the top plate of the U rib to carry out stacking operation;

the lifting seat can be driven to move up and down along the vertical guide rail under the driving of the lifting driving device, and then the material taking plate is driven to move up and down.

Furthermore, the lifting driving device is connected with a lifting screw in a transmission manner, a fixing nut matched with the lifting screw is installed on the lifting seat, and the lifting driving device drives the lifting screw to rotate so as to drive the lifting seat to move up and down.

Further, the material taking plate is arranged at the bottom of the lifting seat and extends forwards;

and a U rib detection element is installed on the front side of the lifting seat and is positioned above the material taking plate.

Further, a cantilever support is installed on the front side of the lifting seat, the U-rib detection element is installed on the cantilever support, and the distance between the U-rib detection element and the front side of the lifting seat is greater than the distance between the front end face of the material taking plate and the front side face of the lifting seat;

the relative position of the material taking plate and the U rib detection element is a preset value;

the U rib detection element detects the U rib in a downward detection mode.

Furthermore, the number of the U-rib detection elements is one, and the U-rib detection elements are positioned at a preset position right above the material taking plate and close to the front position and are used for detecting the top surfaces of the U ribs; or

The number of the U-rib detection elements is two, the U-rib detection elements are respectively positioned at the two sides right above the material taking plate and at the front preset positions and are used for detecting the two side walls of the U-rib; or

The number of the U-rib detection elements is three, the U-rib detection elements are respectively located at the preset positions right above the material taking plate and at the two sides right above the material taking plate and close to the front, and the U-rib detection elements are respectively used for detecting the top plate and the two side walls of the U rib.

Furthermore, a pressing device used for pressing the U ribs on the material taking plate is arranged on the front side of the lifting seat.

Furthermore, the pressing device comprises a pressing cylinder, a pressing head and a pressing slide rail;

the cylinder barrel part of the pressing cylinder is fixedly arranged on the lifting seat, and a cylinder rod of the pressing cylinder faces downwards and is connected with the pressure head;

the pressing slide rail is vertically arranged on the front side of the lifting seat;

the pressure head with push down slide rail cooperation and sliding connection.

Furthermore, the bottom of the lifting seat is also provided with a stop mechanism for limiting the depth of the material taking plate inserted into the U-shaped rib.

Further, the stop mechanism comprises a top plate, a connecting shaft, a stop mounting seat, a return spring and a stop switch;

the top plate is arranged on the front side of the lifting seat, one end of the top plate is connected with the top of the material taking plate in a sliding mode, and the other end of the top plate is fixedly connected with the connecting shaft;

the connecting shaft penetrates through the lifting seat and is connected with the stop switch in a triggering manner at the rear side of the lifting seat;

the stop mounting seat is mounted on the back side of the lifting seat, the stop switch is mounted on the stop mounting seat, and the stop switch is electrically connected with the walking part;

the reset spring is arranged in the stop mounting seat and sleeved on the connecting shaft;

and after the top plate is supported backwards by the U ribs, the connecting shaft is driven to move backwards, the stop switch is triggered, and the walking part is controlled by the control system to stop advancing.

The invention discloses a U-rib stacker-reclaimer, which comprises a walking part, a transverse moving part and a lifting part, wherein the walking part is arranged on the walking part; the walking part is provided with a walking track, and the walking part can move on the walking track along the length direction of the U rib; the transverse moving part is arranged on the walking part and can move on the walking part along the direction vertical to the length direction of the U rib; the lifting part is arranged on the transverse moving part and can move up and down on the transverse moving part along the vertical direction; the lifting part acts on one end of the U rib through the respective movement of the traveling part, the transverse moving part and the lifting part, and the stacking operation is completed.

Specifically, two ends of each U rib can be respectively provided with one U rib stacker-reclaimer disclosed by the invention, and the U ribs to be taken can be accurately positioned by the aid of the liftable material taking plates arranged on the U rib stacker-reclaimers, and then the material taking plates are accurately inserted into gaps between the two U ribs, and finally, the U ribs can be automatically taken and unloaded by the aid of lifting of the material taking plates, so that the working efficiency is improved. Can solve the problem of automatic feeding and discharging of the U-shaped rib,

according to the invention, the sensors are used for detecting the side walls at the two ends of the U rib, the gap between the two U ribs is positioned, the material taking plate is aligned to the gap between the two U ribs and automatically moves along the vertical beam and the cross beam respectively, the U rib to be taken is separated from other U ribs, the U ribs can be automatically fed and discharged, and the working efficiency of the integral welding of the steel box girder is greatly improved.

Drawings

Fig. 1 is a schematic overall structural diagram of an embodiment of a U-rib stacker-reclaimer according to the present invention;

FIG. 2 is a perspective view of another angle of the U-rib stacker-reclaimer shown in FIG. 1;

fig. 3 and 4 are partial structural schematic views of the lifting part;

wherein, the part numbers in the figures are expressed as:

100. u-rib stacker-reclaimer 101, a traveling rail 111, a traveling base 112, a cross beam 121, a vertical beam 122, a traverse guide rail 123, a traverse slide seat 124, a traverse driving device 125, a traverse rack 131, a lifting driving device 132, a lifting seat 133, a lifting guide rail 134, a material taking plate 136, a lifting lead screw 137, a U-rib detecting element 138, a cantilever bracket 139, a pressing cylinder 140, a pressure head 141, a pressing slide rail 142, a top plate 143, a connecting shaft 144, a stop mounting seat 145, a reset spring 146 and a stop switch.

Detailed Description

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. The principles and features of the present invention are described below in conjunction with the drawings, it being noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention.

Referring to fig. 1 to 4, fig. 1 is a schematic overall structural view of an embodiment of a U-rib stacker-reclaimer according to the present invention; FIG. 2 is a perspective view of another angle of the U-rib stacker-reclaimer shown in FIG. 1; fig. 3 and 4 are partial schematic structural views of the lifting unit.

The invention discloses a U-rib stacker-reclaimer 100, which is used for stacking or extracting a U-rib 1000 and comprises a walking part, a transverse moving part and a lifting part; the walking part is provided with a walking track 101, and the walking part can move on the walking track 101 along the length direction of the U rib 1000; the transverse moving part is arranged on the walking part and can move on the walking part along the direction vertical to the length direction of the U rib; the lifting part is arranged on the transverse moving part and can move up and down on the transverse moving part along the vertical direction; the lifting part acts on one end of the U rib through the respective movement of the traveling part, the transverse moving part and the lifting part, and the stacking operation is completed.

Through the respective removal of walking portion, sideslip portion and lift portion, can realize the action with three degrees of freedom in its length direction, the direction of perpendicular to its length and vertical direction of U rib, and then realize getting of U rib or putting things in good order the operation.

Specifically, in one embodiment of the present disclosure, the walking part includes a walking base 111 and a beam 112; the two walking bases 111 are respectively arranged at two ends of the cross beam 112; the walking base 111 is provided with a walking driving device and walking wheels, and the walking wheels are driven by the walking driving device to travel along the walking track 101. The traveling rails 101 under the stacker-reclaimer at both ends of the u-rib may be integrated or may be two independent sections according to the distance moved by the traveling part. The walking track 101 is arranged, so that the walking process is more stable, and the bearing capacity is stronger. The length of the cross member 112 generally exceeds the width of the stacking area of the U-ribs, and ensures that the traverse section can be moved to any one row of the U-ribs.

The transverse moving part comprises a vertical beam 121, a transverse moving guide rail 122 and a transverse moving slide seat 123 fixed on the vertical beam 121; the vertical beam 121 is movably connected to the walking part through the transverse sliding seat 123; the traverse guide 122 is a linear guide and is horizontally and fixedly mounted on the traveling part along the direction perpendicular to the traveling direction of the traveling part; the traverse carriage 123 is engaged with and slidably connected to the traverse rail 122.

The transverse sliding base 123 is driven to transversely move on the transverse sliding guide rail 122, namely on the cross beam 112, so that the U rib is transversely transferred, and the transverse moving stability can be ensured by a transmission mode of a gear rack. Specifically, the traverse section further includes a traverse driving device 124 and a traverse rack 125; the traverse driving device 124 is fixedly mounted on the vertical beam 121, and the traverse rack 125 is horizontally and fixedly mounted on the traverse section; a traverse gear is in transmission connection with the traverse driving device 124, and the traverse gear is matched with and in transmission connection with the traverse rack 125; the upright 121 is horizontally movable along the traverse guide 122 by the traverse driving device 124. Through the mode, not only can the moving stability be realized, but also the precise control can be realized due to the meshing transmission form of the gear and the rack, so that the accurate positioning is ensured, and the intelligent unmanned operation is realized.

The lifting part comprises a lifting driving device 131, a lifting seat 132, a lifting guide rail 133 and a material taking plate 134; the lifting driving device 131 is fixedly arranged on the transverse moving part and is in transmission connection with the lifting seat 132; the lifting guide rail 133 is a linear guide rail and is fixedly mounted on the traverse section in the vertical direction; the lifting seat 132 is matched and slidably connected with the lifting guide rail 133; the material taking plate 134 is fixedly connected to the lifting seat 132, and the material taking plate 134 is used for inserting the lower side of the top plate 142 of the U rib to perform stacking and taking operation; under the driving of the lifting driving device 131, the lifting seat 132 can be driven to move up and down along the vertical guide rail, so as to drive the material taking plate 134 to move up and down.

In order to ensure the stability of the lifting process, the lifting driving device 131 is connected with a lifting screw 136 in a transmission manner, a fixing nut matched with the lifting screw 136 is installed on the lifting base 132, and the lifting driving device 131 drives the lifting screw 136 to rotate so as to drive the lifting base 132 to move up and down.

The material taking plate 134 is arranged at the bottom of the lifting seat 132 and extends forwards; a U-rib detecting element 137 is installed on the front side of the lifting seat 132, and the U-rib detecting element 137 is located above the material taking plate 134. The term "front" as used herein means a direction from the end of the U-rib toward the center of the U-rib when the stacker-reclaimer is placed at both ends of the U-rib.

A cantilever support 138 is installed on the front side of the lifting seat 132, the U-rib detecting element 137 is installed on the cantilever support 138, and the distance between the U-rib detecting element 137 and the front side of the lifting seat 132 is greater than the distance between the front end surface of the material taking plate 134 and the front side surface of the lifting seat 132; to ensure that the U-rib detecting element 137 detects the U-rib during the movement and then sends a control signal.

The relative position of the material taking plate 134 and the U-rib detecting element 137 is a preset value; therefore, the current position information of the material taking plate 134 can be obtained through conversion according to the position signal sent back by the U-rib detection element 137, and the movement of the material taking plate 134 can be further controlled. Preferably, the U-rib detecting element 137 detects the U-rib in a downward direction, that is, the U-rib detecting element 137 is installed above the U-rib to detect the U-rib from the top to the bottom. The U-rib detecting element 137 may be laser-detecting, or may be of another type.

For the arrangement of the U-rib detecting element 137, there are three specific embodiments: 1) the number of the U-rib detecting elements 137 is one, and the U-rib detecting elements are located at a preset position which is right above the material taking plate 134 and is close to the front position and used for detecting the top surfaces of the U ribs; 2) the number of the U-rib detecting elements 137 is two, and the two U-rib detecting elements are respectively located at the two sides right above the material taking plate 134 and at the preset positions close to the front, and are used for detecting two side walls of the U-rib; 3) the number of the U-rib detecting elements 137 is three, and the three U-rib detecting elements are respectively located at the preset positions right above and at the two sides right above the material taking plate 134 and near the front, and are respectively used for detecting the top plate 142 and the two side walls of the U-rib. When one U rib detection element is used, the U rib detection element can be used for detecting the existence of the U rib, two U rib detection elements can be used for detecting two side walls of the U rib by utilizing the characteristic that the two side walls of the U rib are outwards opened, meanwhile, the U rib detection element can be used for centering, one U rib detection element is positioned in the middle and used for detecting the top wall of the U rib, the other two U rib detection elements are used for detecting the two side walls of the U rib and used for centering, and the combination mode is the most accurate.

After the material taking plate 134 takes the U-shaped ribs, the material taking plate is easy to shake during the transfer process, and in order to avoid the occurrence of an unexpected situation, a pressing device for pressing the U-shaped ribs on the material taking plate 134 is further arranged on the front side of the lifting seat 132.

Specifically, the pressing device comprises a pressing cylinder 139, a pressure head 140 and a pressing slide rail 141; the cylinder barrel part of the pressing cylinder 139 is fixedly arranged on the lifting seat 132, and the cylinder rod of the pressing cylinder 139 faces downwards and is connected with the pressure head 140; the pressing slide rail 141 is vertically installed at the front side of the lifting seat 132; the pressing head 140 is matched and slidably connected with the pressing slide rail 141.

When the material taking plate 134 starts to be inserted into the U-shaped rib, in order to control the insertion position, a stop mechanism for limiting the insertion depth of the material taking plate 134 into the U-shaped rib is further provided at the bottom of the lifting seat 132.

Specifically, the stop mechanism includes a top plate 142, a connecting shaft 143, a stop mounting seat 144, a return spring 145 and a stop switch 146; the top plate 142 is arranged at the front side of the lifting seat 132, one end of the top plate 142 is slidably connected with the top of the material taking plate 134, and the other end of the top plate 142 is fixedly connected with the connecting shaft 143; the connecting shaft 143 penetrates through the lifting seat 132 and is in triggering connection with the stop switch 146 at the rear side of the lifting seat 132; the stop mounting base 144 is mounted on the back side of the lifting base 132, the stop switch 146 is mounted on the stop mounting base 144, and the stop switch 146 is electrically connected with the traveling part; the return spring 145 is mounted in the stop mounting seat 144 and sleeved on the connecting shaft 143; after the top plate 142 is pushed backwards by the U-shaped rib, the connecting shaft 143 is driven to move backwards, and the stop switch 146 is triggered (the stop switch 146 is in signal connection with a driving device for controlling the traveling part), and the traveling part is controlled by the control system to stop moving forwards.

The U rib stacker-reclaimer disclosed by the invention has the piling process that the walking part is controlled to move to two ends of the U rib, the walking part is stopped, the transverse moving part is controlled to move to the position of the U rib to be taken along the cross beam 112, the U rib is detected by the U rib detection element 137, the walking part is controlled to feed in the direction of the U rib again, the material taking plate 134 is driven to be inserted into a hole between the upper U rib and the lower U rib, the insertion depth can be controlled by the stopping mechanism to stop feeding after the material taking plate is inserted in place, then the material taking plate 134 is controlled to lift, the U rib is lifted, and the U rib is placed at the designated position by controlling the action of each moving part.

The U-rib stacker-reclaimer provided by the invention can solve various defects caused by only manually operating a crown block in the prior art, realize one-by-one material taking and transferring of U ribs stacked and piled, also realize stacking and piling of the U ribs, realize full-automatic identification and unmanned operation through setting of a control program, greatly improve the working efficiency and reduce the labor cost.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A U-rib stacker-reclaimer is used for stacking or extracting U ribs and is characterized by comprising a walking part, a transverse moving part and a lifting part;

the walking part is provided with a walking track, and the walking part can move on the walking track along the length direction of the U rib;

the transverse moving part is arranged on the walking part and can move on the walking part along the length direction vertical to the U rib;

the lifting part is arranged on the transverse moving part and can move up and down on the transverse moving part along the vertical direction;

the lifting part acts on one end of the U rib through the respective movement of the traveling part, the transverse moving part and the lifting part, and the stacking operation is completed.

2. The U-rib stacker-reclaimer of claim 1, wherein said traveling part comprises a traveling base and a cross beam;

the two walking bases are respectively arranged at two ends of the cross beam;

the walking base is provided with a walking driving device and walking wheels, and the walking wheels are driven by the walking driving device to travel along the walking track.

3. A U-rib stacker-reclaimer as claimed in claim 1, wherein said traverse section comprises an upright beam, a traverse guide rail, and a traverse slide fixed to said upright beam;

4. A U-rib stacker-reclaimer as claimed in claim 3, wherein said traverse section further comprises a traverse driving means and a traverse rack;

5. The U-rib stacker-reclaimer of claim 1, wherein the lifting part comprises a lifting driving device, a lifting seat, a lifting guide rail and a material taking plate;

6. The U-rib stacker-reclaimer of claim 5, wherein the lifting driving device is connected with a lifting screw in a transmission manner, a fixing nut matched with the lifting screw is mounted on the lifting seat, and the lifting driving device drives the lifting screw to rotate so as to drive the lifting seat to move up and down.

7. A U-rib stacker-reclaimer as in claim 6, wherein said reclaimer plate is arranged at the bottom of said lifting seat;

the lifting seat is provided with a U-rib detection element, and the U-rib detection element is positioned above the material taking plate.

8. The U-rib stacker-reclaimer of claim 7, wherein said lifting seat is mounted with a cantilever bracket, said U-rib detecting element is mounted on said cantilever bracket, and the distance between said U-rib detecting element and said lifting seat is greater than the distance between the front end surface of said material taking plate and said lifting seat;

the U rib detection element detects the U rib in a downward detection mode.

9. A U-rib stacker-reclaimer machine, according to claim 8,

the number of the U rib detection elements is one, and the U rib detection elements are positioned at a preset position right above the material taking plate and close to the front and are used for detecting the top surfaces of the U ribs; or

10. A U-rib stacker-reclaimer as claimed in any one of claims 5 to 9, wherein the front side of said lifting base is provided with a press-down means for pressing the U-rib against the reclaimer plate.

11. The U-rib stacker-reclaimer of claim 10, wherein said depressing means comprises a depressing cylinder, a ram and a depressing slide rail;

the pressure head with push down slide rail cooperation and sliding connection.

12. A U-rib stacker-reclaimer as claimed in any one of claims 5 to 9, wherein the bottom of said lifting seat is further provided with a stop mechanism for limiting the depth of insertion of the reclaimer plate into the U-rib.

13. The U-rib stacker-reclaimer of claim 12, wherein said stop mechanism comprises a top plate, a connecting shaft, a stop mounting seat, a return spring and a stop switch;