Large workpiece handling device

Abstract

The present invention relates to a large workpiece handling device, and belongs to the technical field of workpiece transport devices. The present invention includes a base, two groups of conveying wheel groups, two pressure sensors and two groups of adjustment drive components. The bottom of the base is connected with a walking structure. The two groups of conveying wheel groups are arranged on the base symmetrically. Each group of conveying wheel groups includes a plurality of conveying wheel units. The conveying wheel units include a wheel frame and a roller. The wheel frame is rotatably mounted on the base, and the roller protrudes upward from the top surface of the base. Two pressure sensors are respectively installed between the base and the two groups of conveying wheel groups. Two groups of adjustment drive components are respectively connected to the two groups of conveying wheel groups. The adjustment drive components include a first gear, a first rack and a driving member. The two driving members in the two groups of adjustment drive components are respectively controlled and connected to the two pressure sensors. A large workpiece handling device provided by the present invention can realize automatic centering of the workpiece in the left and right directions, and the conveying process of the workpiece is safer and smoother.

Description

Technical Field

[0001] The invention relates to the technical field of workpiece transport devices, and in particular to a large workpiece transport device. Background Art

[0002] Workpiece transport equipment is an indispensable part of modern manufacturing and logistics industries. They are used to efficiently transport and process workpieces on production lines, in warehouses or inside factories. For some large and heavy workpieces, the use of transport equipment for transportation can greatly improve production efficiency, reduce manual labor intensity and reduce production costs.

[0003] The workpiece handling equipment in the prior art, such as the construction material transfer mechanism disclosed in the patent with authorization announcement number CN220701134U, includes a transfer vehicle, and the top of the transfer vehicle is symmetrically provided with two groups of mounting grooves, and a plurality of spaced mounting seats are installed inside the two groups of mounting grooves, and each mounting seat is installed with a transfer wheel.

[0004] When the device is in use, the workpiece to be transported is placed on the transfer vehicle, and the workpiece contacts the transfer wheel on the top of the mounting seat, so that the operator can more easily pull the workpiece for loading and unloading, and the process of loading and unloading the workpiece is more convenient. However, when using the device to transport large and heavy workpieces, it cannot be guaranteed that the workpiece placed on the transfer vehicle can be aligned with the transfer vehicle every time. If the workpiece is not aligned with the transfer vehicle, the device is prone to lose balance due to unstable center of gravity when transporting the workpiece. When turning or accelerating, the risk of the device tipping over increases, and the tipping of the device will cause damage to the workpiece and cause harm to the operator, resulting in reduced safety in the use of the device. Summary of the invention

[0005] The present invention provides a large workpiece transport device to solve the technical problem that the transport device in the prior art is difficult to align the workpiece with the device when placing the large workpiece, resulting in an unstable overall center of gravity of the device, which is easy to tip over during transportation and has reduced safety performance.

[0006] In order to solve the above problems, the present invention provides a large workpiece handling device adopting the following technical solutions:

[0007] A large workpiece handling device comprises a base, the bottom of the base is connected to a walking structure, the top of the base is provided with two groups of conveying wheel groups which are symmetrical to support and convey the workpieces, each group of conveying wheel groups comprises a plurality of conveying wheel units which are spaced apart and distributed in the front-back direction, the conveying wheel units comprise a wheel frame and a roller which is rotatably mounted on the top of the wheel frame around a horizontal axis, the roller protruding upward from the top surface of the base, and further comprises:

[0008] Two pressure sensors are respectively installed between the base and the two conveying wheel groups, and are used to detect the pressures borne by the two conveying wheel groups;

[0009] Two groups of adjustment drive assemblies are respectively connected to the two groups of conveying wheel assemblies, and the adjustment drive assemblies include a first gear, a first rack and a driving member. The wheel frame is rotatably mounted on the base around a vertical axis, a plurality of first gears are provided and are respectively fixed to each wheel frame, the first gear is coaxial with the rotation axis of the wheel frame, the first rack is movably mounted on the base and meshes with the corresponding plurality of first gears, and the driving member is connected to the first rack to drive the first rack to move forward and backward;

[0010] The driving members in the two sets of adjustment drive assemblies are respectively connected to the two pressure sensors for control. During the process of conveying the workpiece from back to front, the driving members are used to drive the first rack to move forward or backward when the pressure values ​​detected by the two pressure sensors are not equal, so as to drive the wheel frame in the conveying wheel group to rotate and convey the workpiece toward the side with smaller pressure value.

[0011] By adopting the above technical solution, when a large workpiece is placed on the handling device, it is supported by the roller protruding from the top surface of the base, so that the large workpiece can be moved to the front of the handling device. If the position of the large workpiece is tilted in the left and right directions, and the center of gravity deviates from the center of the base, the two sets of conveying wheel groups will be subjected to different pressures. In this way, the pressure values ​​detected by the two pressure sensors are different, and the driving member will react. The driving member drives the first rack to move forward or backward for a certain distance, so that the first gear rotates clockwise or counterclockwise by a certain angle, and drives the front end of the roller to deviate toward the side with the smaller pressure value detected. In this way, in the process of pushing the workpiece forward on the handling device, the roller will drive the workpiece to move toward the side with the smaller pressure detected, so that the center of gravity of the workpiece moves toward the middle of the base, until the pressure values ​​detected by the two pressure sensors are equal, the driving member reacts again, drives the first rack to reset, and the roller to return to the center, so as to achieve the centering of the workpiece, avoid the problem of unstable center of gravity and easy tipping of the equipment during the conveying process, and make the conveying process more stable and safe.

[0012] Furthermore, the base is provided with two strip support members, both of which extend in the front-to-back direction and are installed on the base for vertical movement, and two sets of conveying wheel groups are respectively passed through the two strip support members up and down; a lifting drive member is connected between the strip support members and the base, and the lifting drive member is used to drive the strip support members to move up and down, so that the top surface of the strip support members is lower than the top of the roller during the process of placing the workpiece to facilitate the movement of the workpiece, and the top surface of the strip support members is higher than the top of the roller after the workpiece is straightened to support the workpiece.

[0013] By adopting the above technical solution, the strip support can move up and down, and the conveying wheel group is inserted into the strip support. In the process of adjusting the position of the workpiece, the top surface of the strip support can be made lower than the top of the roller, so that the workpiece can move on the roller, reducing friction and making it easier to move the workpiece. After the position of the workpiece is corrected, the strip support is driven to move upward to above the top of the roller, so that the strip support can support the workpiece more stably and avoid shaking of the workpiece during the transfer with the equipment.

[0014] Furthermore, the strip support is provided with a plurality of friction components arranged at intervals in front and back, the friction components are elastically mounted on the strip support up and down, and a plurality of cams arranged at intervals in front and back are also rotatably mounted on the strip support, each cam is respectively located below each friction component, a second gear is coaxially fixed to the cam, and a plurality of second racks extending vertically and respectively meshing with each second gear are fixed on the base, when the lifting drive drives the strip support to move upward, the second rack meshes with the second gear to drive the cam to rotate, and the cam pushes the friction component upward so that the friction component protrudes from the top surface of the strip support.

[0015] By adopting the above technical solution, while the driving member drives the strip support member to move upward, the second rack on the strip support member drives the second gear to rotate, thereby driving the cam to rotate, so that the cam pushes the friction assembly to move upward, so that the top end of the friction assembly protrudes from the top surface of the strip support member, and the friction assembly contacts the workpiece. This can increase the friction force between the workpiece and the workpiece, and the workpiece is less likely to slide or fall off during the transportation process.

[0016] Furthermore, the friction assembly includes two sliders that are symmetrical front and back and movably installed on the strip support, two end friction blocks that are located between the two sliders and arranged symmetrically front and back, and a middle friction block clamped between the two end friction blocks. The slider has a maximum limit position for up and down movement on the strip support, a first elastic member that can elastically stretch up and down is connected between each slider and the strip support, a second elastic member that can elastically stretch back and forth is connected between each slider and the end friction block on the corresponding side, the middle friction block has two front-to-back symmetrical pushing inclined surfaces, the two pushing inclined surfaces move away from each other from top to bottom, and the side of the end friction block close to the middle friction block has a pushing inclined surface that fits the pushing inclined surface, and the cam is located directly below the middle friction block, and the cam drives the friction assembly to move upward by pushing the middle friction block.

[0017] By adopting the above technical solution, when conveying a workpiece with a flat bottom surface, the driving member only needs to drive the strip support member to lift a lower height so that the top surface of the strip support member is slightly higher than the top of the roller. At this time, the distance that the cam pushes the friction assembly to move upward is also short. At this time, only a small section of the top of the end friction block and the middle friction block protrudes from the top surface of the strip support member, and the protruding part increases the friction force and prevents the workpiece from sliding. When the bottom surface of the conveyed workpiece is a convex arc surface, the driving member lifts the strip support member to a higher height. At this time, the second rack drives the second gear to rotate a larger angle, and the cam rotates a larger angle. The push friction assembly moves upward to move the slider to the highest limit position, and continues to push the middle friction block upward to make the middle friction block push the two end friction blocks away from each other, and the middle friction block protrudes upward from the two end friction blocks. In this way, the height of the middle friction block is higher, and the protruding middle friction block can stop the conveyed workpiece to prevent the workpiece from rolling down.

[0018] Furthermore, the multiple groups of friction components on the strip-shaped support member and the multiple conveying wheel units in the conveying wheel group on the corresponding side are arranged alternately in the front-to-back direction.

[0019] By adopting the above technical solution, the friction components and the conveying wheel units are distributed more evenly.

[0020] Furthermore, a limit stop block protruding from the top surface of the base is provided on the front side of the base, and a lifting drive member is connected between the front and rear ends of the strip support and the base, and the lifting drive member has a driving output end, and the driving output ends of the two lifting drives are hinged on the base, and the driving output end of at least one lifting drive can be hinged on the strip support member to move forward and backward; the second rack is slidably assembled on the base in a forward and backward guiding manner, and a third elastic member is connected between the second rack and the base, and the third elastic member enables the second rack to be pressed tightly on the second gear.

[0021] With the above technical solution, the limit stopper is arranged at the front side of the workpiece to prevent the workpiece from sliding off from the front side. Since the driving output end of the lifting drive member is hinged with the strip support member, and the driving output end of the lifting drive member on at least one side can move forward and backward on the strip support member, in the process of the lifting drive member driving the strip support member to move upward, the lifting drive member on the rear side can be raised a higher distance, so that the top surface of the strip support member is tilted to a state where the rear side is high and the front side is low, thereby preventing the workpiece from sliding off from the rear side, and making the placement of the workpiece on the equipment more stable. Since the strip support member will drive the second gear to leave its original position when it is tilted, the second rack is connected to the base to move forward and backward and is elastically pressed on the second gear to prevent the second gear from interfering with the second rack when the strip support member is tilted.

[0022] Furthermore, a handrail is connected to the front side of the base.

[0023] The adoption of the technical solution makes it easier to support the movement of the equipment.

[0024] Furthermore, the walking structure includes a plurality of walking wheels connected to the bottom of the base.

[0025] The beneficial effect of a large workpiece handling device provided by the present invention is that it can realize automatic centering of the workpiece in the left and right directions, and the conveying process of the workpiece is safer and smoother. After the workpiece is centered, the strip support can be raised to support the workpiece to prevent the roller from driving the workpiece to roll. For workpieces with a flat bottom surface, the friction component can be raised to increase the friction force on the workpiece, and the workpiece is not easy to fall off the equipment. For workpieces with a circular arc bottom surface, the middle friction block can be raised to block it to prevent the workpiece from rolling off the equipment. Even if there is no clamping structure, the workpiece can be placed in the handling device more stably for transfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0027] Figure 1 A schematic diagram of a large workpiece handling device provided by the present invention Figure 1 ;

[0028] Figure 2 A schematic diagram of a large workpiece handling device provided by the present invention Figure 2 ;

[0029] Figure 3 A schematic diagram of a large workpiece handling device provided by the present invention Figure 3 ;

[0030] Figure 4 A schematic diagram of a large workpiece handling device provided by the present invention Figure 4 ;

[0031] Figure 5 for Figure 4 A schematic diagram of the structure enlargement at the center A;

[0032] Figure 6 A schematic diagram of a large workpiece handling device provided by the present invention Figure 5 ;

[0033] Figure 7 for Figure 6 A schematic diagram of the structure enlarged at B in the middle;

[0034] Figure 8A schematic structural diagram of a conveying wheel unit in a large workpiece handling device provided by the present invention;

[0035] Fig. 9 A schematic diagram of the structure of a strip support member in a large workpiece handling device provided by the present invention Figure 1 ;

[0036] Fig.10 A schematic diagram of the structure of a strip support member in a large workpiece handling device provided by the present invention Figure 2 ;

[0037] Fig.11 A cross-sectional view of a strip-shaped support member in a large workpiece handling device provided by the present invention;

[0038] Fig.12 for Fig.11 A schematic diagram of the structure enlarged at C in the middle;

[0039] Fig.13 A simplified structural diagram of a conveying wheel assembly in a large workpiece handling device provided by the present invention.

[0040] Description of reference numerals:

[0041] 1. Base; 101. Strip groove; 2. Strip support; 201. Circular avoidance hole; 202. Square avoidance hole; 203. Strip hinge hole; 3. Roller; 4. Pressure block; 5. Handrail; 6. Walking wheel; 7. Lifting drive member; 8. Wheel frame; 801. Main frame; 802. Rotating shaft; 9. Second rack; 10. Third elastic member; 11. Drive member; 12. First rack; 13. First gear; 14. Second gear; 15. Cam; 16. Slider; 17. End friction block; 18. Middle friction block; 19. Second elastic member; 20. Limit block; 21. Mounting plate; 22. Pressure sensor. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0043] The following is one embodiment of a large workpiece handling device provided by the present invention:

[0044] like Figure 1-Figure 13As shown, a large workpiece handling device includes a base 1, a conveying wheel group, a pressure sensor 22, an adjustment drive assembly, a strip support 2, a lifting drive member 7, a friction assembly, a cam 15, a second gear 14 and a second rack 9.

[0045] like Figure 1 , Figure 2 As shown, the base 1 is arranged horizontally, and the bottom of the base 1 is connected to a walking structure, which includes a plurality of walking wheels 6. The top of the base 1 is provided with two strip grooves 101 with openings facing upwards, and the two strip grooves 101 are arranged symmetrically and extend in the front-to-back direction. The front side of the top of the base 1 is connected to a limit stopper 20 protruding upward from the top surface of the base 1, and the front end of the base 1 is connected to an armrest 5.

[0046] like Figure 1 As shown, there are two conveying wheel groups, which are arranged symmetrically and disposed in the two strip grooves 101 respectively. Each conveying wheel group includes a plurality of conveying wheel units arranged at equal intervals along the front-to-back direction.

[0047] like Figure 8 As shown, the conveying wheel unit includes a wheel frame 8 and a roller 3. The wheel frame 8 includes a main frame body 801 and a rotating shaft 802 fixedly connected to the bottom of the main frame body 801 and extending vertically, and the rotating shaft 802 is rotatably mounted on the base 1. The roller 3 is rotatably mounted on the main frame body 801, and the rotation axis of the roller 3 extends horizontally.

[0048] There are two pressure sensors 22, which are respectively arranged in two strip grooves 101 and located between the bottom surface of the strip groove 101 and the bottom surface of the rotating shaft 802. The two pressure sensors 22 are respectively used to detect the pressure borne by the two groups of conveying wheel groups.

[0049] like Fig.13 As shown, the specific installation method of the pressure sensor 22 is as follows: a mounting groove for mounting the pressure sensor 22 is provided on the bottom surface of the strip groove 101, the mounting groove is located at the middle position of the strip groove 101, the pressure sensor 22 is placed in the mounting groove, the bottom end of the rotating shaft 802 in each conveying wheel unit in each conveying wheel group is rotatably mounted on a long strip-shaped pressing block 4 extending forward and backward, and the upper and lower positions between the rotating shaft 802 and the pressing block 4 are relatively fixed, and the pressing block 4 is guided and slidably assembled in the strip groove 101 and located above the pressure sensor 22. When the workpiece is pressed on the roller 3, the pressure of the workpiece is transmitted to the pressure sensor 22 through the roller 3, the main frame 801, the rotating shaft 802, and the pressing block 4, so that the pressure sensor 22 can detect the pressure of the workpiece borne by the roller 3.

[0050] There are two sets of adjustment drive components, which are respectively connected to the two conveying wheel groups to drive the rollers 3 in the conveying wheel groups to rotate around the vertical rotation axis. The two sets of adjustment drive components are respectively arranged in the two strip grooves 101.

[0051] like Figure 6 , Figure 7 , Figure 8 As shown, the adjustment drive assembly includes a first gear 13, a first rack 12 and a driving member 11. A plurality of first gears 13 are provided, and the plurality of first gears 13 are fixedly mounted on each rotating shaft 802, and the upper and lower positions of the first gears 13 on the rotating shaft 802 are fixed. The first rack 12 extends in the front-to-back direction and is mounted on the base 1 so as to be movable back and forth. The first rack 12 is meshed with the plurality of first gears 13 on the plurality of rotating shafts 802 connected to the same group of conveying wheel groups. The driving member 11 is fixedly mounted on the base 1 and is located at the front end inside the strip groove 101. The driving member 11 is a cylinder that can be extended back and forth. The first rack 12 is connected to the driving output end of the driving member 11, and the driving member 11 can drive the first rack 12 to move back and forth.

[0052] The driving member 11 is control-connected to the two pressure sensors 22. The driving member 11 responds to the detection results of the two pressure sensors 22. When there is a difference in the pressures detected by the two pressure sensors 22, the driving member 11 drives the first rack 12 to move forward or backward, driving the first gear 13 to rotate clockwise or counterclockwise, thereby driving the roller 3 to deflect from back to front toward the side with smaller pressure detected by the pressure sensor 22, so as to adjust the moving path of the workpiece moving on the roller 3 so that the center of gravity of the workpiece moves toward the center of the base 1 during the forward movement.

[0053] like Figure 1 As shown, there are two strip support members 2, and the two strip support members 2 are respectively inserted into the two strip grooves 101 by sliding up and down. The strip support member 2 is provided with a plurality of circular avoidance holes 201 arranged at equal intervals in the front and back, and a plurality of square avoidance holes 202 arranged at equal intervals in the front and back, and each circular avoidance hole 201 is alternately distributed with each square avoidance hole 202 in sequence. The strip support member 2 is sleeved on the outer side of each conveying wheel unit in the same conveying wheel group through each circular avoidance hole 201. The front hole wall and the rear hole wall of the square avoidance hole 202 are both provided with strip slide grooves extending up and down.

[0054] like Figure 3 , Figure 4As shown, there are four lifting drive members 7, and the lifting drive members 7 adopt lifting cylinders. Each strip groove 101 is provided with a lifting drive member 7 at the front and rear ends respectively. The front and rear ends of the above-mentioned strip support member 2 are respectively hinged on the driving output ends of the two lifting drive members 7 in the strip groove 101, and the lifting drive member 7 located on the front side and the strip support member 2 are slidingly hinged. The specific connection method is: the front end of the strip support member 2 is provided with a strip hinge hole 203 extending front and back and passing through left and right, and the driving output end of the lifting drive member 7 located on the front side is connected with a hinge shaft extending left and right, and the hinge shaft passes through left and right and is arranged in the strip hinge hole 203.

[0055] Due to the connection relationship between the lifting drive member 7 and the strip support member 2, the lifting drive member 7 located on the front side and the lifting drive member 7 located on the rear side can drive the strip support member 2 to rise to different heights, so that the rear end of the strip support member 2 is higher than the front end. In this way, the top surface of the strip support member 2 presents a state in which the rear end is higher and the front end is lower, which can prevent the workpiece from slipping from the rear end of the base 1 when the base 1 drives the workpiece forward.

[0056] There are multiple groups of friction components, and each square avoidance hole 202 on each strip support member 2 is provided with a group of friction components.

[0057] like Fig.11 , Fig.12 As shown, the friction assembly includes a sliding block 16 , an end friction block 17 and a middle friction block 18 .

[0058] There are two sliders 16, which are symmetrically distributed front and back and are respectively installed on the front hole wall and the rear hole wall of the square avoidance hole 202. The specific installation method is: a plug-in block is provided on the opposite side of the two sliders 16, and the two plug-in blocks are respectively slidably inserted in the strip slide grooves on the front hole wall and the rear hole wall of the avoidance hole, so that the slider 16 can be installed on the strip support member 2 in an upward and downward manner. A first elastic member is connected between the plug-in block and the bottom groove wall of the strip slide groove, and the first elastic member is a compression spring that can be extended and retracted in the upward and downward directions. A second elastic member 19 is connected to the side of the slider 16 facing the other slider 16, and the second elastic member 19 is a compression spring that can be extended and retracted in the forward and backward directions.

[0059] There are two end friction blocks 17 made of silicone rubber. The two end friction blocks 17 are respectively connected to the ends of the two second elastic members 19 facing away from the slider 16. A sliding slope is provided on one side of the end friction block 17 facing the other end friction block 17. The two sliding slopes of the two end friction blocks 17 move away from each other from top to bottom.

[0060] The middle friction block 18 is made of silicone rubber and is located between the two end friction blocks 17. The middle friction block 18 has two push inclined surfaces symmetrically arranged front and back. The two push inclined surfaces move away from each other from top to bottom. The middle friction block 18 is clamped between the two end friction blocks 17 under the action of the second elastic member 19, and the push inclined surfaces are in contact with the push inclined surfaces on the corresponding sides.

[0061] like Fig.10 , Fig.11 , Fig.12 As shown, there are multiple cams 15, each cam 15 is arranged in each square avoidance hole 202, and a rotating shaft extending left and right is coaxially fixed to the cam 15. The rotating shaft is rotatably installed on the strip support 2. One end of the rotating shaft close to the middle of the base 1 passes through the square avoidance hole 202 and extends to the outside of the strip support 2. The cam 15 is located directly below the middle friction block 18 in the corresponding square avoidance hole 202.

[0062] like Fig. 9 , Fig.10 As shown, a plurality of second gears 14 are provided, each second gear 14 is coaxially fixedly connected to each rotary shaft, and is located on one end of the corresponding rotary shaft passing through the outer side of the square avoidance hole 202 .

[0063] like Figure 4 , Figure 5 As shown, the second rack 9 is provided with multiple pieces, and the second rack 9 is elastically mounted on the vertical groove wall located inside the strip groove 101. The specific mounting method is: a mounting plate 21 is mounted on the vertical groove wall located inside the strip groove 101 to slide back and forth, and a third elastic member 10 is connected between the mounting plate 21 and the base 1. The third elastic member 10 is a compression spring that can be extended back and forth. The second rack 9 extends in the up-down direction and is fixedly connected to the plate surface of the mounting plate 21 facing the strip groove 101. Each second rack 9 corresponds to each second gear 14 position, and the second rack 9 meshes with the corresponding second gear 14 to drive the second gear 14 to rotate when the lifting drive member 7 drives the strip support member 2 to move upward, thereby driving the cam 15 to rotate to push the middle friction block 18.

[0064] Since the rear end of the strip support 2 is raised higher than the front end of the strip support 2, the strip support 2 rotates as it moves upward. The second rack 9 is made into a structure that can elastically move back and forth, which can avoid interference between the second rack 9 and the second gear 14 during the upward rotation of the strip support 2. At the same time, the second rack 9 and the second gear 14 can maintain normal meshing transmission.

[0065] When the present invention is used, the large workpiece to be transported is first placed on the rearward part of the base 1, and then the large workpiece is gradually pushed forward to move the large workpiece to the front side of the base 1. After the large workpiece is placed on the base 1, the pressure sensors 22 at the bottom of the two groups of conveying wheel groups respectively detect the pressure borne by the conveying wheel groups on the corresponding sides. When there is a difference in the pressure measured by the two pressure sensors 22, the driving member 11 responds to the detection result of the pressure sensor 22, drives the first rack 12 to move forward or backward, drives the first gear 13 to rotate counterclockwise or clockwise, and then drives the wheel frame 8 to rotate, so that the roller 3 on the wheel frame 8 deflects the set angle toward the side with smaller pressure detected, so that when the large workpiece continues to move forward along the roller 3, the center of gravity of the large workpiece will move toward the middle of the base 1, until the pressures detected by the two pressure sensors 22 are the same, and the large workpiece is centered in the left and right directions. At this time, the driving member 11 drives the first rack 12 to reset, drives the roller 3 to reset, so that the large workpiece is kept in the left and right centered position and continues to be transported forward, and finally the workpiece is moved to contact with the limit stopper 20.

[0066] Continue to repeat the above steps, place more workpieces on the base 1, and after the base 1 is full of workpieces, start the lifting drive 7, which drives the strip support 2 to move upward, so that the top surface of the strip support 2 is higher than the top of the roller 3, so that the workpiece leaves the roller 3, and the workpiece is prevented from sliding on the roller 3. While the strip support 2 moves upward, it drives the cam 15 to rotate, so that the cam 15 pushes the middle friction block 18 upward, drives the entire friction assembly to move upward, and makes the top of the friction assembly protrude upward from the top of the strip support 2, so as to increase the friction force on the workpiece, and further prevent the workpiece from sliding on the strip support 2. The lifting drive 7 located at the rear side drives the strip support 2 to move upward for a distance greater than the lifting drive 7 located at the front side drives the strip support 2 to move upward, so that the rear end of the top surface of the strip support 2 is higher than the front end, which can prevent the workpiece from sliding from the rear side during the conveying process. When the workpiece being transported is a workpiece with an arc-shaped bottom surface such as a round tube, the lifting drive 7 drives the strip support 2 to move upward a higher distance, so that the cam 15 rotates at a larger angle, causing the cam 15 to push the middle friction block 18 upward. At this time, the middle friction block 18 can be used as a limit block to block the round tube and prevent the round tube from rolling significantly on the strip support 2.

[0067] The present invention is easier to achieve left-right centering of a large workpiece when in use, and the friction between the workpiece and the strip support 2 is relatively large, which can reduce the problem of the workpiece sliding, and the conveying process of the workpiece is safer and smoother.

[0068] In this embodiment, the driving output end of the lifting drive member 7 is hinged to the strip support member 2. In other embodiments, the driving output end of the lifting drive member 7 is fixedly connected to the strip support member 2. At this time, the lifting drive member 7 can only lift the front and rear ends of the strip support member 2 by the same distance at the same time, and the top surface of the strip support member 2 can only be in a horizontal state.

[0069] In this embodiment, the friction assembly includes a slider 16, an end friction block 17 and a middle friction block 18. In other embodiments, the friction assembly only includes a friction block elastically slidably assembled on the strip support 2. The cam 15 pushes the friction block upward so that the top end of the friction block protrudes from the top surface of the strip support 2, thereby increasing the friction between the workpiece and the strip support 2.

[0070] In this embodiment, the multiple groups of friction components on the strip support 2 and the multiple conveying wheel units in the conveying wheel group on the corresponding side are arranged alternately in the front-to-back direction. In other embodiments, the multiple groups of friction components can be arranged side by side with the multiple conveying wheel units. In this case, the strip support 2 needs to be made wider to meet the requirement of arranging the friction components and the conveying wheel units side by side.

[0071] In this embodiment, the walking structure adopts walking wheels 6 , and in other embodiments, the walking structure adopts a crawler structure.

Claims

1. A large workpiece handling device, comprising a base, a walking structure connected to the bottom of the base, two groups of conveying wheel groups symmetrically arranged on the top of the base to support and convey the workpiece, each group of conveying wheel groups comprising a plurality of conveying wheel units spaced apart in the front-to-back direction, the conveying wheel unit comprising a wheel frame and a roller mounted on the top of the wheel frame for rotation around a horizontal axis, the roller protruding upward from the top surface of the base, characterized in that: Also includes: Two pressure sensors are respectively installed between the base and the two conveying wheel groups, and are used to detect the pressures borne by the two conveying wheel groups; Two groups of adjustment drive assemblies are respectively connected to the two groups of conveying wheel assemblies, and the adjustment drive assemblies include a first gear, a first rack and a driving member. The wheel frame is rotatably mounted on the base around a vertical axis, a plurality of first gears are provided and are respectively fixed to each wheel frame, the first gear is coaxial with the rotation axis of the wheel frame, the first rack is movably mounted on the base and meshes with the corresponding plurality of first gears, and the driving member is connected to the first rack to drive the first rack to move forward and backward; The driving members in the two groups of adjusting driving assemblies are respectively connected to the two pressure sensors for control. When the workpiece is conveyed from the back to the front, the driving member is used to drive the first rack to move forward or backward when the pressure values ​​detected by the two pressure sensors are not equal, so as to drive the wheel frame in the conveying wheel group to rotate and convey the workpiece to the side with the smaller pressure value. Two strip support members are arranged on the base, and the two strip support members are both extended in the front-rear direction and are movably installed on the base up and down, and two sets of conveying wheel groups are respectively passed through the two strip support members up and down; a lifting driving member is connected between the strip support member and the base, and the lifting driving member is used to drive the strip support member to move up and down, so that the top surface of the strip support member is lower than the top of the roller in the process of placing the workpiece to facilitate the movement of the workpiece, and the top surface of the strip support member is higher than the top of the roller after the workpiece is straightened to support the workpiece; The strip support is provided with a plurality of friction components arranged at intervals in front and back, and the friction components are elastically mounted on the strip support up and down. A plurality of cams arranged at intervals in front and back are also rotatably mounted on the strip support, and each cam is respectively located below each friction component, and a second gear is coaxially fixed to the cam. A plurality of second racks extending vertically and respectively meshing with each second gear are fixed on the base. When the lifting drive drives the strip support to move upward, the second rack meshes with the second gear to drive the cam to rotate, and the cam pushes the friction component upward so that the friction component protrudes from the top surface of the strip support.

2. A large workpiece handling device according to claim 1, characterized in that: The friction assembly includes two sliders that are symmetrical front and back and can be movably installed on the strip support member up and down, two end friction blocks that are located between the two sliders and arranged symmetrically front and back, and a middle friction block clamped between the two end friction blocks. The slider has a maximum limit position for up and down movement on the strip support member, a first elastic member that can elastically stretch up and down is connected between each slider and the strip support member, a second elastic member that can elastically stretch back and forth is connected between each slider and the end friction block on the corresponding side, the middle friction block has two front and back symmetrical pushing inclined surfaces, the two pushing inclined surfaces move away from each other from top to bottom, and the side of the end friction block close to the middle friction block has a pushing inclined surface that fits the pushing inclined surface, and the cam is located directly below the middle friction block, and the cam drives the friction assembly to move upward by pushing the middle friction block.

3. A large workpiece handling device according to claim 2, characterized in that: The multiple groups of friction components on the strip-shaped support member and the multiple conveying wheel units in the conveying wheel group on the corresponding side are arranged alternately in the front-to-back direction.

4. A large workpiece handling device according to claim 2, characterized in that: The front side of the base is provided with a limit stop protruding from the top surface of the base, and a lifting drive member is connected between the front and rear ends of the strip support and the base, and the lifting drive member has a driving output end. The driving output ends of the two lifting drives are hinged on the base, and the driving output end of at least one lifting drive member can be hinged on the strip support member to move forward and backward; the second rack is slidably assembled on the base in a forward and backward guiding manner, and a third elastic member is connected between the second rack and the base, and the third elastic member enables the second rack to be pressed tightly on the second gear.

5. A large workpiece handling device according to any one of claims 1 to 4, characterized in that: The front side of the base is connected with an armrest.

6. A large workpiece handling device according to any one of claims 1 to 4, characterized in that: The walking structure comprises a plurality of walking wheels connected to the bottom of the base.

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