CN115027949A

CN115027949A - Clamping device

Info

Publication number: CN115027949A
Application number: CN202210904944.6A
Authority: CN
Inventors: 张亚洲; 郝向彬; 林毅; 吴其强
Original assignee: Guangdong Guochuang Intelligent Technology Co ltd
Current assignee: Guangdong Guochuang Intelligent Technology Co ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2022-09-09

Abstract

The invention provides a clamping device which comprises a rack, a pair of clamping components, a driving component and a guide component, wherein the clamping components are arranged on the rack and can simultaneously clamp the side walls of two sides of a workpiece; the pair of clamping components are respectively fixed on two sides of the conveying belt, and each clamping component comprises a pneumatic clamping finger for clamping the side wall of a workpiece and a connecting component for fixing the pneumatic clamping finger and the conveying belt; according to the clamping device, the servo motor in the driving assembly drives the driving wheel to drive the conveying belt to rotate around the driven wheel, so that the pair of clamping assemblies fixed on the conveying belt is driven to move in the opposite direction or in the opposite direction, the relative distance between the pair of clamping assemblies is changed, the clamping assemblies can clamp workpieces with different sizes and specifications, and the production efficiency is improved; the side wall of the workpiece is clamped by the pneumatic clamping fingers in the clamping assembly, so that the deformation of the thin-wall workpiece caused by the influence of external force can be effectively avoided.

Description

Clamping device

Technical Field

The invention belongs to the technical field of mechanical clamps, and particularly relates to a clamping device.

Background

Along with the improvement of living standard of people, small household appliances such as an electric cooker gradually come into common families, the automation degree of the production line of the small household appliances is higher and higher, parts such as a cooker liner and a middle layer of the electric cooker are automatically transformed, and the production line of a lace shell of the electric cooker is also automatically transformed. The lace shell is of a metal plate structure, a plurality of stamping and blanking process flows exist in the production process of the traditional lace shell, the blank of the lace shell is a sheet metal workpiece, and the thickness of the sheet metal is about 0.28-0.5 mm. At present, the manual material taking operation mode is mainly adopted in the market, the feeding and discharging speed of a manual punch press is limited by the manual speed, and the production efficiency is low; the operation height is repeated in the manual material taking process, the worker fatigue is easily caused, and the punch press operation has higher potential safety hazard. Although the automation technology is applied to some enterprises in the market, the clamp compatibility of clamping the flower shell is not enough, and the work fixture is generally required to be manually switched, so that the production efficiency is low, and the labor cost is wasted.

Disclosure of Invention

The invention aims to solve the defects that the existing lace shell taking mode is low in efficiency, high in potential safety hazard, insufficient in compatibility of a clamp for clamping a lace shell and generally needs manual work for switching a tool clamp, and provides a clamping device.

The technical scheme adopted by the invention for solving the technical problem is as follows: a clamping device comprises a rack, a pair of clamping components, a driving component and a guide component, wherein the clamping components are arranged on the rack and can simultaneously clamp the side walls of two sides of a workpiece, the driving component is arranged on the rack and is used for driving the clamping components to move in the opposite direction or in the opposite direction, and the guide component is used for limiting the clamping components to move;

the driving assembly comprises a servo motor arranged on the rack, a driving wheel fixed on a driving rod of the servo motor, two driven wheels respectively arranged at two ends of the rack and a conveying belt horizontally surrounding the driving wheel and the driven wheels, and the pair of clamping assemblies are respectively fixed at two sides of the conveying belt;

the clamping assembly comprises a pneumatic clamping finger for clamping the side wall of the workpiece and a connecting assembly for fixing the pneumatic clamping finger and the conveying belt.

Furthermore, the pneumatic clamping fingers comprise a driving cylinder fixedly connected with the connecting assembly, a pair of driving blocks arranged at the bottom of the driving cylinder and a pair of elastic clamping fingers respectively fixed on the driving blocks.

Specifically, the elastic clamp finger comprises an adjusting block fixedly connected with the driving block and a clamping block attached to the side wall of the workpiece.

Furthermore, the pneumatic clamping finger also comprises a first adjusting bolt fixedly connected with the adjusting block and the driving block, a plurality of positioning holes are formed in the driving block, a plurality of fixing holes matched with the positioning holes are formed in the adjusting block, and the first adjusting bolt penetrates through the fixing holes and is locked on the positioning holes.

Further, coupling assembling include with direction subassembly swing joint's link, with link fixed connection centre gripping the splint of conveyer belt and inciting somebody to action the link with pneumatic clamp indicates fixed connection's mounting panel.

Specifically, the link is including being located the vertical board in the frame outside and being located the horizontal plate of frame bottom, splint with the vertical board of link is located respectively the both sides of conveyer belt, the horizontal plate of link with guide assembly swing joint.

Furthermore, the guide assembly comprises a linear guide rail fixed below the rack and a pair of sliding blocks arranged on the linear guide rail, and the horizontal plate of the connecting frame is fixed at the bottom of the sliding blocks.

Further, the driving assembly further comprises a first adjusting wheel and a second adjusting wheel which are arranged on the rack and used for adjusting the tightness of the conveying belt, the first adjusting wheel is movably connected to the rack, and the second adjusting wheel is fixed to the rack.

Further, the frame includes support frame and the horizontal link that mutually perpendicular set up, the centre gripping subassembly, drive assembly and the direction subassembly all set up in on the horizontal link.

Specifically, a rotating assembly is arranged between the support frame and the horizontal connecting frame, and the horizontal connecting frame is fixedly connected with the support frame through the rotating assembly.

The clamping device provided by the invention has the beneficial effects that: the servo motor in the driving assembly drives the driving wheel to drive the conveying belt to rotate around the driven wheel, so that the pair of clamping assemblies fixed on the conveying belt are driven to move in the opposite direction or in the opposite direction to change the relative distance between the pair of clamping assemblies, the clamping assemblies can clamp workpieces with different sizes and specifications, the compatibility of the clamping device is improved, the manual replacement of a clamp is not needed, and the production efficiency and the safety are improved; the side wall of the workpiece is clamped by the pneumatic clamping fingers in the clamping assembly, so that the deformation of the thin-wall workpiece caused by the influence of external force can be effectively avoided.

Drawings

FIG. 1 is a schematic perspective view of a clamping device according to the present invention;

FIG. 2 is an isometric view of a clamping arrangement provided by the present invention;

FIG. 3 is a schematic perspective view of a single clamping assembly in a clamping apparatus according to the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 2 at A;

FIG. 5 is a schematic view of a rotary assembly of a clamping device according to the present invention;

in the figure: 100-a clamping component,

10-machine frame, 11-supporting frame, 12-horizontal connecting frame, 20-clamping component, 21-connecting component,

211-connecting frame, 2111-vertical plate, 2112-horizontal plate, 212-mounting plate, 213-clamping plate,

22-pneumatic clamping finger, 221-driving cylinder, 222-driving block, 2221-positioning hole, 223-elastic clamping finger, 2231-clamping block, 2232-adjusting block, 2233-fixing hole, 224-first adjusting bolt,

30-driving component, 31-servo motor, 32-driving wheel, 33-driven wheel, 34-conveying belt,

35-a first adjusting wheel, 36-a second adjusting wheel, 40-a guide component, 41-a linear guide rail, 42-a slide block, 50-a rotating component, 51-a positioning plate, 52-a disc, 53-a connecting column, 54-a fixing plate,

55-second adjusting bolt.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1-5, a clamping device 100 is provided. The clamping device 100 includes a frame 10, a pair of clamping assemblies 20 disposed on the frame 10 for simultaneously clamping two side walls of a workpiece, a driving assembly 30 disposed on the frame 10 for driving the pair of clamping assemblies 20 to move toward or away from each other, and a guiding assembly 40 for limiting the movement of the clamping assemblies 20. After receiving the control signal, the driving assembly 30 drives the pair of clamping assemblies 20 to move toward or away from each other to the clamping position for clamping the workpiece relative to the frame 10 under the guiding and limiting effect of the guiding assembly 40 according to the control signal, and then the pair of clamping assemblies 20 simultaneously clamp the side walls on both sides of the workpiece, so that the clamping assemblies 20 can clamp the side walls of the workpiece. The clamping device 100 is installed on a mechanical arm of the blanking robot, the blanking robot drives the clamping device 100 to move to a workpiece blanking position, and then the clamping assembly 20 releases the workpiece, so that the workpiece enters the next processing procedure. The driving assembly 30 drives the clamping assembly 20 to move towards or away from the machine frame 10 under the action of the guide assembly 40 according to the control signal to a clamping position required for clamping the next workpiece. The clamping device 100 drives the pair of clamping assemblies 20 to move towards or away from each other through the driving assembly 30 so as to change the relative distance between the pair of clamping assemblies 20, so that the clamping assemblies 20 can clamp workpieces with different specifications, the compatibility of the clamping device 100 is improved, manual replacement of a clamp is not needed, and the production efficiency and safety are improved. Moreover, the two clamping assemblies 20 are used for clamping the side walls of the two sides of the workpiece at the same time, so that the stress deformation caused by directly clamping the outer walls of the two sides of the thin-wall workpiece by the clamp can be effectively avoided.

The driving assembly 30 comprises a servo motor 31 arranged on the frame 10, a driving wheel 32 fixed on a driving rod of the servo motor 31, two driven wheels 33 respectively arranged at two ends of the frame 10, and a conveyor belt 34 horizontally surrounding the driving wheel 32 and the driven wheels 33, and the pair of clamping assemblies 20 are respectively fixed at two sides of the conveyor belt 34; the clamping assembly 20 comprises a pneumatic clamping finger 22 for clamping the side wall of the workpiece, a connecting assembly 21 for fixing the pneumatic clamping finger 22 with the conveyor belt 34, and a clamping device fixed below the connecting assembly 21. After receiving the control signal, the servo motor 31 drives the driving wheel 32 to rotate according to the control signal, the driving wheel 33 arranged at two ends of the frame 10 is driven to rotate by the conveyor belt 34 horizontally surrounding the driving wheel 32 and the driven wheel 33, and then the connecting assembly 21 fixed on the conveyor belt 34 is driven to drive the pneumatic clamping fingers 22 fixed below the connecting assembly 21 to move towards or away from each other under the limiting and guiding action of the guiding assembly 40 to a clamping position required for clamping the workpiece, then the pneumatic clamping fingers 22 of the pair of clamping assemblies 20 simultaneously clamp the side walls at two sides of the workpiece, so that the workpiece is fixed on the pneumatic clamping fingers 22, the blanking robot drives the clamping device 100 to move to the workpiece blanking position, the pneumatic clamping fingers 22 release the workpiece, the servo motor 31 drives the driving wheel 32 to rotate according to the received control signal, and drives the driven wheels 33 arranged at two ends of the frame 10 to rotate by the conveyor belt 34 horizontally surrounding the driving wheel 32 and the driven wheel 33, and then the connecting component 21 fixed on the conveyor belt 34 is driven to drive the pneumatic clamping fingers 22 fixed below the connecting component 21 to move towards or away from each other to a clamping position required for clamping the next workpiece under the limiting and guiding effects of the guide component 40. The servo motor 31 drives the driving wheel 32 to drive the clamping components 20 fixed on two sides of the conveying belt 34 to move in the opposite direction or in the opposite direction relative to the rack 10 under the guiding and limiting effect of the guiding component 40, and the parallelism of the pair of clamping components 20 in the opposite direction or in the opposite direction movement process can be well guaranteed, so that the accuracy of clamping the side walls on two sides of the workpiece by the clamping device 100 is improved, and the pneumatic clamping fingers 22 are prevented from extruding the side walls of the workpiece to cause waste materials due to the fact that errors exist in the relative positions of the pneumatic clamping fingers 22 in the process of simultaneously clamping the side walls on two sides of the workpiece by the pair of pneumatic clamping fingers 22.

Further, as shown in fig. 3, the pneumatic gripper fingers 22 include a driving cylinder 221 fixed below the connecting assembly 21, a pair of driving blocks 222 disposed at the bottom of the driving cylinder 221, and a pair of elastic gripper fingers 223 fixed to the driving blocks 222, respectively, for gripping the side walls of the workpiece. The resilient clamp fingers 223 include adjustment blocks 2232 fixedly connected to the drive block 222 and clamp blocks 2231 that clamp the side walls of the workpiece. After the driving assembly 30 drives the pneumatic clamping finger 22 to move to a clamping position required for clamping a workpiece according to the control signal, the driving cylinder 221 drives the elastic clamping finger 223 fixed on the driving block 222 to close, the clamping block 2231 of the elastic clamping finger 223 abuts against the side wall of the workpiece and clamps the workpiece, after the workpiece is placed at the workpiece blanking position, the driving cylinder 221 drives the elastic clamping finger 223 fixed on the driving block 222 to open, and the fixing state between the elastic clamping finger 223 and the workpiece is released. By clamping the workpiece side wall through the elastic clamping fingers 223, the workpiece side wall can be effectively protected, and abrasion between the pneumatic clamping fingers 22 and the workpiece side wall when the pneumatic clamping fingers 22 clamp the workpiece side wall is prevented.

Further, as shown in fig. 3, the pneumatic clamp finger 22 further includes a first adjusting bolt 224 fixedly connecting the adjusting block 2232 and the driving block 222, the driving block 222 is provided with a plurality of positioning holes 2221, the adjusting block 2232 is provided with a plurality of fixing holes 2233 mutually matched with the positioning holes 2221, and the first adjusting bolt 224 passes through the fixing holes 2233 and is locked to the positioning holes 2221. When the relative position between the elastic clamping finger 223 and the driving cylinder 221 needs to be adjusted, the first adjusting bolt 224 is rotated, the fixing state between the adjusting block 2232 of the elastic clamping finger 223 and the driving block 222 of the driving cylinder 221 is released, then the relative position between the driving block 222 and the adjusting block 2232 is adjusted, so that the fixing hole 2233 on the adjusting block 2232 and the center of the positioning hole 2221 on the driving block 222 are located on the same horizontal line, the concentricity between the fixing hole 2233 and the positioning hole 2221 is ensured, then the first adjusting bolt 224 passes through the fixing hole 2233 on the adjusting block 2232 and is locked in the positioning hole 2221 on the driving block 222, so that the adjusting block 2232 and the driving block 222 are fixedly connected, and the stability of the fixed connection between the two is ensured. Two positioning holes 2221 are formed in the driving block 222, two fixing holes 2233 matched with the positioning holes 2221 are formed in the adjusting block 2232, and the first adjusting bolt 224 penetrates through the different positioning holes 2221 and the fixing holes 2233 matched with each other, so that the relative positions of the elastic clamp fingers 223 and the driving block 222 are adjusted, the pneumatic clamp fingers 22 can clamp workpieces with different heights, and the clamping compatibility of the clamping device 100 for workpieces with different specifications is further improved.

Further, as shown in fig. 1 to 3, the connecting assembly 21 includes a connecting frame 211 movably connected to the guide assembly 40, a clamping plate 213 fixedly connected to the connecting frame 211 for clamping the conveyor belt 34, and a mounting plate 212 fixedly connecting the connecting frame 211 to the pneumatic clamping fingers 22. The connecting frame 211 comprises a vertical plate 2111 positioned at the outer side of the frame 10 and a horizontal plate 2112 positioned at the bottom of the frame 10, the clamping plate 213 and the vertical plate 2111 of the connecting frame 211 are respectively positioned at two sides of the conveyor belt 34, and the horizontal plate 2112 of the connecting frame 211 is movably connected with the guide assembly 40. The vertical plate 2111 of the connecting frame 211 and the clamping plate 213 are respectively provided with a plurality of through holes which are matched with each other, the vertical plate 2111 of the connecting frame 211 and the plurality of through holes on the clamping plate 213 are aligned, the centers of the plurality of through holes on the vertical plate 2111 of the connecting frame 211 and the clamping plate 213 are positioned on the same horizontal line, the concentricity between the vertical plate 2111 of the connecting frame 211 and the clamping plate 213 is ensured, and then the connecting frame 211 and the clamping plate 213 are fixedly connected by connecting pieces such as bolts, studs, pins and the like, so that the connecting frame 211 and the conveyor belt 34 are fixedly connected by the clamping plate 213. The driving cylinder 221 of the pneumatic clamping finger 22 is fixedly connected with the bottom of the mounting plate 212, the mounting plate 212 is also provided with a plurality of through holes which are matched with the bottom of the horizontal plate 2112 of the connecting frame 211, the centers of the through holes on the mounting plate 212 and the through holes on the horizontal plate 2112 of the connecting frame 211 are positioned on the same horizontal line, after the concentricity between the two is ensured, the connecting frame 211 and the mounting plate 212 are fixedly connected by using connecting pieces such as bolts, studs, pins and the like, so that the pneumatic clamping finger 22 fixedly connected with the mounting plate 212 is fixedly connected with the bottom of the connecting frame 211, and further when the servo motor 31 drives the driving wheel 32 to drive the conveyor belt 34 to horizontally surround the driven wheel 33 to rotate, the horizontal plate 2112 of the connecting frame 211 fixed on the conveyor belt 34 drives the pneumatic clamping finger 22 to horizontally move relative to the rack 10 under the guiding and limiting effects of the guiding assembly 40.

Further, as shown in fig. 4, the guide assembly 40 includes a linear guide 41 fixed below the frame 10 and a pair of sliders 42 disposed on the linear guide 41, and the horizontal plate 2112 of the link bracket 211 is fixed to the bottom of the slider 42. The linear guide rail 41 is fixedly connected with the frame 10, the pair of sliding blocks 42 are respectively fixed on the horizontal plates 2112 of the connecting frames 211 of the pair of clamping assemblies 20, and when the servo motor 31 drives the driving wheel 32 to drive the transmission belt 34 to horizontally rotate around the driven wheel 33, the pneumatic clamping fingers 22 move towards or away from the frame 10 under the action of limiting guide of the linear guide rail 41 through the sliding blocks 42 on the connecting frames 211. The pair of linear guide rails 41 fixed on the horizontal plate 2112 of the connecting frame 211 respectively drive the pair of pneumatic clamping fingers 22 to move towards or away from each other, so that the parallelism between the pair of pneumatic clamping fingers 22 and the frame can be effectively ensured when the pair of pneumatic clamping fingers 22 move towards or away from each other, the clamping precision of the pneumatic clamping fingers 22 when clamping a workpiece is improved, and the pneumatic clamping fingers 22 are prevented from moving towards or away from the frame 10 and causing relative offset between the positions of the pneumatic clamping fingers 22 and the frame, so that the workpiece is extruded in the process of clamping the workpiece by the pneumatic clamping fingers 22, and waste materials are generated.

Further, as shown in fig. 1, the driving assembly 30 further includes a first adjusting wheel 35 and a second adjusting wheel 36, which are disposed on the frame 10 and used for adjusting the tightness of the conveyor belt 34, the first adjusting wheel 35 is movably connected to the frame 10, and the second adjusting wheel 36 is fixed to the frame 10. The rack 10 is provided with a strip-shaped through hole for movably connecting the first adjusting wheel 35, the relative position of the first adjusting wheel 35 on the rack 10 can be adjusted through the strip-shaped through hole, and after the first adjusting wheel 35 is adjusted to a proper position, the first adjusting wheel 35 is fixed on the rack 10 through locking pieces such as bolts and studs. The second adjusting wheel 36 is locked on the frame 10 through a connecting piece such as a bolt and a stud, so that the outer edge surfaces of the first adjusting wheel 35 and the second adjusting wheel 36 are horizontally surrounded by the fixed conveying belt 34 between the second adjusting wheel 36 and the frame 10, when the conveying belt 34 horizontally surrounds the driving wheel 32 and the driven wheel 33, the friction force acting on the conveying belt 34 through the first adjusting wheel 35 and the second adjusting wheel 36 can effectively adjust the tension degree of the conveying belt 34 when the conveying belt is horizontally surrounded, the tension state is kept, and therefore sufficient acting force is provided for the connecting frame 211 fixed on the conveying belt 34, and the connecting frame 211 drives the pneumatic clamping fingers 22 to move towards or away from each other relative to the frame 10. The first adjusting wheel 35 and the second adjusting wheel 36 can also position the conveyor belt 34, so that the conveyor belt 34 is always kept in a state of being perpendicular to the frame 10 in the process of horizontal rotation, and the conveyor belt 34 is prevented from being separated from the driving wheel 32 and the driven wheel 33.

Further, as shown in fig. 3 and 5, the frame 10 includes a supporting frame 11 and a horizontal connecting frame 12 that are vertically disposed, and the clamping assembly 20, the driving assembly 30 and the guiding assembly 40 are disposed on the horizontal connecting frame 12. A rotating assembly 50 is arranged between the support frame 11 and the horizontal connecting frame 12, and the horizontal connecting frame 12 is fixedly connected with the support frame 11 through the rotating assembly 50. The rotating assembly 50 includes a positioning plate 51 fixedly connected to the supporting frame 11, a circular disc 52 movably connected to the positioning plate 51, a fixing plate 54 fixedly connected to the horizontal connecting frame 211, and a connecting column 53 disposed between the fixing plate 54 and the circular disc 52. A plurality of through holes which are matched with each other are arranged on a positioning plate 51 fixedly connected with a support frame 11 and a disc 52 arranged at the top of a connecting column 53, when the angle of a horizontal connecting frame 12 needs to be adjusted so as to clamp workpieces in different directions, a second adjusting bolt 55 fixedly connected with the positioning plate 51 and the disc 52 is rotated, the state of the fixed connection between the positioning plate 51 and the disc 52 is released, then the horizontal connecting frame 12 is rotated, so that the horizontal connecting frame 12 drives a clamping component 20, a driving component 30 and a guiding component 40 which are arranged on the horizontal connecting frame 12 to rotate to proper positions relative to the support frame 11 through the connecting column 53 and the disc 52 arranged at the top of the connecting column 53, the through holes on the positioning plate 51 are aligned with the through holes on the disc 52, the through holes on the positioning plate 51 and the disc 52 are positioned on the same vertical line, and the concentricity between the positioning plate 51 and the disc 52 is ensured, and then, a second adjusting bolt 55 is used for penetrating through a through hole on the positioning plate 51 and locking the through hole on the disc 52, so that the positioning plate 51 is fixedly connected with the disc 52, and the stability of the fixed connection between the positioning plate 51 and the disc 52 is ensured. By adjusting the relative angle between the horizontal connecting frame 12 and the supporting frame 11 through the rotating component 50, the clamping device 100 can clamp workpieces in different directions, and the compatibility and applicability of the clamping device 100 are further improved.

The clamping device 100 drives the driving wheel 32 to drive the conveying belt 34 to rotate around the driven wheel 32 through the servo motor 31 in the driving assembly 30, and further drives the pair of clamping assemblies 20 fixed on the conveying belt 34 to move towards or away from each other to change the relative distance between the pair of clamping assemblies 20, so that the clamping assemblies 20 can clamp workpieces with different sizes, the compatibility of the clamping device 100 is improved, manual replacement of clamps is not needed, and the production efficiency and safety are improved; the pneumatic clamping fingers 22 in the clamping assembly 20 are used for clamping the side wall of the workpiece, so that the thin-walled workpiece can be effectively prevented from being deformed under the influence of external force.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A clamping device is characterized by comprising a rack, a pair of clamping components, a driving component and a guide component, wherein the clamping components are arranged on the rack and can simultaneously clamp the side walls of two sides of a workpiece;

2. The clamping device as claimed in claim 1, wherein the pneumatic clamping fingers comprise a driving cylinder fixedly connected with the connecting assembly, a pair of driving blocks arranged at the bottom of the driving cylinder, and a pair of elastic clamping fingers respectively fixed on the driving blocks.

3. A clamping apparatus according to claim 2, wherein said resilient fingers comprise adjustment blocks fixedly connected to said drive block and clamping blocks engageable with side walls of said workpiece.

4. The clamping device as claimed in claim 3, wherein the pneumatic clamping finger further comprises a first adjusting bolt fixedly connecting the adjusting block and the driving block, the driving block is provided with a plurality of positioning holes, the adjusting block is provided with a plurality of fixing holes mutually matched with the positioning holes, and the first adjusting bolt passes through the fixing holes and is locked on the positioning holes.

5. A clamping assembly according to claim 1 wherein said connecting assembly includes a connecting bracket movably connected to said guide assembly, a clamping plate fixed to said connecting bracket and a mounting plate connecting said connecting bracket to said pneumatic clamping fingers.

6. A holding device as claimed in claim 5, wherein the connecting frame comprises a vertical plate located outside the frame and a horizontal plate located at the bottom of the frame, the clamping plate and the vertical plate are respectively located at two sides of the conveyor belt, and the horizontal plate is movably connected with the guide assembly.

7. A holding device as claimed in claim 6, wherein said guide assembly comprises a linear guide fixed below said frame and a pair of sliders mounted on said linear guide, the horizontal plate of said connecting frame being fixed to the bottom of said sliders.

8. The apparatus of claim 1, wherein the drive assembly further comprises a first adjustment wheel and a second adjustment wheel disposed on the frame for adjusting the tension of the conveyor belt, the first adjustment wheel is movably coupled to the frame, and the second adjustment wheel is fixed to the frame.

9. A holding arrangement as claimed in any one of claims 1 to 8, wherein the frame comprises a support frame and a horizontal connecting frame arranged perpendicular to each other, the holding assembly, the drive assembly and the guide assembly being arranged on the horizontal connecting frame.

10. The apparatus of claim 9, wherein the frame further comprises a rotating assembly disposed between the support frame and the horizontal connecting frame, and the horizontal connecting frame is fixedly connected to the support frame via the rotating assembly.