CN114212508B - Pipe rail bridging type mechanism of production line - Google Patents

Pipe rail bridging type mechanism of production line Download PDF

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Publication number
CN114212508B
CN114212508B CN202111549087.4A CN202111549087A CN114212508B CN 114212508 B CN114212508 B CN 114212508B CN 202111549087 A CN202111549087 A CN 202111549087A CN 114212508 B CN114212508 B CN 114212508B
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China
Prior art keywords
pipe rail
fixed pipe
bearing
production line
bearing table
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CN202111549087.4A
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Chinese (zh)
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CN114212508A (en
Inventor
冯正伟
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Dongguan Jianli Intelligent Technology Co ltd
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Dongguan Jianli Intelligent Technology Co ltd
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Publication of CN114212508A publication Critical patent/CN114212508A/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G47/00Article or material-handling devices associated with conveyors; Methods employing such devices
    • B65G47/74Feeding, transfer, or discharging devices of particular kinds or types
    • B65G47/82Rotary or reciprocating members for direct action on articles or materials, e.g. pushers, rakes, shovels
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G43/00Control devices, e.g. for safety, warning or fault-correcting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00Lifting frames, e.g. for lifting vehicles; Platform lifts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/28Constructional details, e.g. end stops, pivoting supporting members, sliding runners adjustable to load dimensions

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Control Of Conveyors (AREA)

Abstract

The invention relates to the technical field of production and processing equipment, and discloses a pipe rail bridging mechanism of a production line, which comprises a plurality of fixed pipe rails which are sequentially sequenced, wherein bearing blocks are arranged between the fixed pipe rails, the bearing blocks comprise lifting devices, material carrying devices and a delivery device, and the delivery device is provided with a bearing table capable of carrying the material carrying devices and a power device for driving the bearing table to move; the invention has the following advantages: the lifting device is used for driving the bearing block to descend and put the carrying device at the position of the bearing table for carrying to a manual operation, and then the lifting device resets the bridging fixed pipe rail, so that other carrying devices can pass through the operation station without affecting the operation process of the total equipment of the production line; after the material loading device is taken back by the delivery device, the operation station enters a standby state, and after one operation station is processed by a worker, other operation stations in the standby state can be processed immediately, so that the material loading or unloading efficiency is high, and the consumption of human resources is reduced.

Description

Pipe rail bridging type mechanism of production line
Technical Field
The invention relates to the technical field of production and processing equipment, in particular to a pipe rail bridging mechanism of a production line.
Background
Along with the rapid development of social economy, the production and processing industry is continuously updated and improved, in the production lines of some production and processing industries, such as meat processing, vegetable and fruit seasoning processing and the like, the auxiliary feeding is manually adopted to facilitate the transportation and feeding of various different materials by the production lines, the large-scale processing and production equipment has high production efficiency, meanwhile, the production lines also need to feed or discharge a large amount of materials for a long time, but manpower is difficult to support and transport a large amount of materials for a long time, the common material transporting mechanism adopts a mode of small amount but frequent feeding or discharging, a large number of workers are required to operate in place by the production lines, the frequent mechanical working mode is easy to lead the workers to be tired, the conventional mode of feeding or discharging in one time is adopted, the speed is low, and the workers waiting for other stations need to feed or discharge synchronously, so that the operation efficiency of the large-scale processing and production equipment is greatly reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a pipe rail bridging mechanism of a production line, which has the advantage of multi-station high-efficiency feeding or discharging.
In order to achieve the above purpose, the pipe rail bridging mechanism of the production line comprises a plurality of fixed pipe rails which are sequentially sequenced, gaps are arranged between the fixed pipe rails, bearing blocks are arranged in the gaps, and the pipe rail bridging mechanism comprises a lifting device, wherein the lifting device can drive the bearing blocks to move up and down; the device comprises a fixed pipe rail and is characterized by further comprising a material carrying device and a delivery device, wherein the material carrying device is provided with a hook capable of being hung on the fixed pipe rail to move, and the delivery device is provided with a bearing table capable of carrying the material carrying device and a power device for driving the bearing table to move.
Further, the lifting device is a secondary cylinder, and a fixed end of the lifting device is provided with a shell fixedly connected with the fixed pipe rail.
Further, the lifting device is provided with a first sensor for sensing the position of the material carrying device.
Further, the hanger also comprises a chain transmission device corresponding to the fixed pipe rail, wherein the chain transmission device is provided with a push block, and the push block can push the hanger to move.
Further, the hook is provided with a roller, and the roller is provided with a concave wall matched with the fixed pipe rail.
Preferably, the bearing block is provided with a concave position, and a convex part capable of supporting the concave wall of the roller is arranged in the concave position.
Further, the consignment device is provided with a guide post, the bearing table is provided with a tripod, and the power device can drive the tripod to move along the guide post.
Further, the material loading device is provided with a center column, the bearing table is provided with a calibration position matched with the center column, and the center column is provided with a limiting rod.
Further, a clamping hand is arranged above the bearing table.
Further, the shipping device is provided with a controller.
The beneficial effects are that: compared with the prior art, the pipe rail bridging mechanism of the production line comprises a plurality of fixed pipe rails which are sequentially sequenced, wherein bearing blocks are arranged between the fixed pipe rails, the pipe rail bridging mechanism comprises a lifting device, a material carrying device and a delivery device, and the delivery device is provided with a bearing table capable of carrying the material carrying device and a power device for driving the bearing table to move; the invention has the following advantages: the lifting device is used for driving the bearing block to descend and put the carrying device at the position of the bearing table for carrying to a manual operation, and then the lifting device resets the bridging fixed pipe rail, so that other carrying devices can pass through the operation station without affecting the operation process of the total equipment of the production line; after the material loading device is taken back by the delivery device, the operation station enters a standby state, and after one operation station is processed by a worker, other operation stations in the standby state can be processed immediately, so that the material loading or unloading efficiency is high, and the consumption of human resources is reduced.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a schematic view of a lifting device housing according to the present invention.
Fig. 3 is a schematic diagram of a first sensor and a second sensor according to the present invention.
Fig. 4 is a schematic view of a hook structure of a loading device according to the present invention.
Fig. 5 is a schematic structural view of the shipping device of the present invention.
Fig. 6 is a schematic view of a loading device carried by a load-bearing table according to the present invention.
Fig. 7 is a schematic view of a chain transmission device according to the present invention.
The reference numerals include:
the device comprises a fixed pipe rail-1, a bearing block-11, a concave position-1101, a lifting device-2, a shell-21, a first sensor-22, a second sensor-23, a loading device-3, a hook-31, a roller-32, a limit rod-33, a central column-34, a delivery device-4, a mounting frame-401, a supporting rod-402, a bearing table-41, a calibration position-411, a triangular bracket-412, a power device-42, a guide column-43, a clamping hand-44, a controller-45, a chain transmission device-5, a push block-51 and a third sensor-52.
Detailed Description
The present invention will be described in detail with reference to fig. 1 to 7.
The invention relates to a pipe rail bridging mechanism of a production line, which comprises a plurality of fixed pipe rails 1 which are sequentially sequenced, wherein gaps are arranged between the fixed pipe rails 1, bearing blocks 11 are arranged in the gaps, and the pipe rail bridging mechanism comprises a lifting device 2, wherein the lifting device 2 can drive the bearing blocks 11 to move up and down; the device further comprises a material carrying device 3 and a delivery device 4, wherein the material carrying device 3 is provided with a hook 31 capable of being hung on the fixed pipe rail 1 to move, and the delivery device 4 is provided with a bearing table 41 capable of carrying the material carrying device 3 and a power device 42 for driving the bearing table 41 to move. In the technical scheme of the invention, the production line total equipment is provided with a plurality of operation stations, each operation station is provided with a bearing block 11, a lifting device 2 and a delivery device 4, when the material carrying device 3 passes through the bearing block 11 of one idle operation station, the lifting device 2 drives the bearing block 11 to descend so that the material carrying device 3 is separated from the fixed pipe rail 1, then the material carrying device 3 is placed on the bearing table 41, the power device 42 drives the bearing table 41 to deliver the material carrying device 3 to a manually operated position for loading or unloading, the operation stations enter a standby state, the lifting device 2 drives the bearing block 11 to ascend and reset so that other material carrying devices 3 can enter the next idle operation station through the operation stations without affecting the operation progress of the production line total equipment, and after finishing one operation station, the staff can immediately process other operation stations in the standby state, so that the loading or unloading efficiency is high, and the consumption of manpower resources is further reduced.
The lifting device 2 adopts a secondary cylinder with low cost and convenient installation, the movable end of the lifting device 2 is fixedly connected with the bearing block 11, when the material carrying device 3 is positioned on the bearing block 11, the lifting device 2 descends to the first level to separate the material carrying device 3 from the fixed pipe rail 1, and then the power device 42 drives the bearing table 41 to prepare for carrying the material carrying device 3; after the bearing table 41 is in place, the lifting device 2 descends to a second level, the material carrying device 3 is placed on the bearing table 41, the hooks 31 of the material carrying device 3 are separated from the bearing blocks 11, then the material carrying device 3 is carried to a manually operated position by the bearing table 41, and the lifting device 2 is reset; the fixed end of elevating gear 2 is provided with the casing 21 with fixed pipe rail 1 fixed connection, and elevating gear 2's expansion end resets the back, and bearing platform 41 is unanimous with the horizontal position of fixed pipe rail 1, prevents to carry the accident emergence of material falling out of carrying device 3 that the material is thrown by a wide margin when carrying device 3 through bearing block 11.
On the other hand, considering that the weight of the material carried by the material carrying device 3 may be large and the strength of the secondary cylinder is insufficient, the lifting device 2 and the power device 42 may be replaced by a motor or a more powerful driving device according to the requirement.
In the technical scheme of the invention, the lifting device 2 is provided with the second sensor 23 for sensing the weight of the material loading device 3, and the lifting device 2 drives the weight bearing block 11 to descend only when the material loading device 3 reaching the preset weight range reaches the position of the weight bearing block 11, so that the material loading or unloading work flow can be avoided from being repeated when the material loading device 3 loaded or unloaded by other operation stations passes through the operation stations.
One of the preset schemes for the second inductor 23 is: the operation station is ready for unloading work, the weight of the material loading device 3 is N, the weight sensing minimum value of the second sensor 23 is preset to be N+2KG, and when the material loading device 3 with the unloaded material of other operation stations passes through the operation station, the weight of the material loading device 3 is lower than the minimum weight preset by the second sensor 23, and the lifting device 1 can not be started.
The lifting device 2 is provided with a first sensor 22 for sensing the loading device 3. At the load-bearing platform 41 delivery material carrying device 3, first inductor 22 response couple 31 leaves, just can send the inductive signal and drive elevating gear 2 to reset for elevating gear 2 reset time interval further improves the work efficiency of production line, also prevents elevating gear 2 not to return to the position for a long time, leads to other material carrying device 3 to stay before the clearance of fixed pipe rail 1, and the casing improves conveying efficiency.
The device also comprises a chain transmission device 5 corresponding to the fixed pipe rail 1, wherein the chain transmission device 5 is provided with a push block 51, and the push block 51 can push the hook 31 hung on the fixed pipe rail 1 to move. According to a further scheme of the invention, a plurality of operation stations are equidistantly arranged on the production line main equipment, the chain transmission device 5 is provided with an intermittent operation mode, when the pushing block 51 pushes the material carrying device 3 to the bearing block 11, the chain transmission device 5 is stopped briefly, if the chain transmission device 5 is not stopped, when the lifting device 2 drives the bearing block 11 to descend, the pushing block 51 continues to push the material carrying device 3 to enable the material carrying device 3 to be separated from the bearing block 11, and serious faults can be caused when the material carrying device 3 impacts the cross section of the fixed pipe rail 1.
Furthermore, the pushing block 51 is provided with a third sensor 52, and when the pushing block 51 contacts the material loading device 3, the third sensor 52 sends a signal to the production line total equipment, so that the production line total equipment controls the running processes of other operation station equipment, and collision between the material loading devices 3 is avoided.
The hook 31 is provided with a longer notch, and the bearing block 11 can be separated from the notch when the bearing table 41 carries the material carrying device 3; the upper end of the hook 31 is provided with an arc-shaped shell which can be pushed by the pushing block in a butt mode, a cavity is formed in the shell, a roller 32 is arranged in the cavity, the roller 32 is provided with a concave wall matched with the fixed pipe rail 1, and the material carrying device 3 can move stably on the fixed pipe rail 1.
The bearing block 11 is provided with a concave position 1101, when the pushing block 51 pushes the material carrying device 3 to reach the bearing block 11, the concave position can buffer the inertia and enable the material carrying device 3 to accurately stay on the bearing block 11, the concave position 1101 can further prevent the hook 31 from accidentally separating from the bearing block 11 in the ascending and descending processes of the lifting device 1, and a convex part capable of supporting the concave wall of the roller 32 is arranged in the concave position 1101 so as to reduce the shaking amplitude when the material carrying device 3 passes through.
The shipping device 4 is provided with a guide post 43, the bearing table 41 is provided with a tripod 412, and the power device 42 can drive the tripod 412 to move along the guide post 43. In this technical scheme, the bearing performance of bearing platform 41 can be strengthened to the tripod 412, and guide post 43 adopts solid tubular metal resonator, further strengthens the bearing capacity of delivery device 4 to guide post 43 is provided with a pair of, makes bearing platform 41 be difficult for rocking when removing, and stability is high.
The shipping device 4 is provided with a mounting frame 401, the guide posts 43 and the power device 42 are mounted on the mounting frame 401, triangular support rods 402 are arranged on two sides of the mounting frame 401, and when the material loading device 3 is loaded or unloaded, if the weight of the material is large, workers can support the support rods 402 to keep the gravity center, or force is applied to the support rods 402, so that loading or unloading is facilitated.
The material loading device 3 is provided with a center column 34, the bearing table 41 is provided with a calibration position 411 matched with the center column 34, when the lifting device 2 descends to the first level, the bearing table 41 moves to the lower side of the bearing block 11, the calibration position 411 is matched with the center column 34, one end of the center column 34, which is close to the hook 31, is provided with a limit rod 33, when the lifting device 2 descends to the second level, the limit rod 33 is placed on the bearing table 41, the bearing table 41 carries the material loading device 3 in a hanging mode, the material loading device 3 can be prevented from toppling in the process of carrying by adopting the carrying mode, the lifting device 2 and the carrying device 4 are almost integrated, and the equipment for operating the station is more compact.
Similarly, the stability of the material loading device 3 in the process of delivery is improved, the clamping hand 44 is arranged above the bearing table 41, and the clamping hand 44 can clamp the hook 31, so that the material loading device 3 is not easy to shake in the process of delivery by the bearing table 41 and during loading or unloading by staff.
The shipping device 4 is provided with a controller 45, the controller 45 can regulate and control the state of the operation station equipment, and the shipping device comprises:
the switch comprises: for turning on and off the power supply, when the power supply is turned off, the lifting device 2 does not operate even if the material loading device 3 is positioned in the concave position of the bearing block 11 and reaches the range of the preset sensing weight;
standby: the power is turned on, default is standby state, and the lifting device 2 will not operate in the standby state;
idle: in the state, when the lifting device 2 senses that the material carrying device 3 in the preset weight range reaches the bearing block 11, the bearing block 11 is driven to descend so that the material carrying device 3 is separated from the fixed pipe rail 1 and carried to a manual operation position by the bearing table 41, then the lifting device 2 is reset, and the state of controlling operation station equipment is automatically changed from an idle state to a standby state; in the standby state, when no material loading device 3 is arranged on the bearing table 41, a worker can manually press a control button corresponding to the state;
busy four: after the worker finishes loading or unloading the loading device 3, the worker manually selects the button to enable the bearing platform 41 to send the loading device 3 back to the fixed pipe rail 1, specifically, the lifting device 2 drives the bearing block 11 to descend to the second level, the lifting device 2 ascends to the first level after the first sensor 22 senses the loading device 3, then the power device 42 drives the bearing platform 41 to be separated from the central column 34, then the lifting device 2 drives the bearing block 11 to reset, and finally the state is automatically converted into the idle state.
The foregoing is merely exemplary of the present invention, and those skilled in the art should not be considered as limiting the invention, since modifications may be made in the specific embodiments and application scope of the invention in light of the teachings of the present invention.

Claims (4)

1. The utility model provides a pipe rail bridging formula mechanism of production line, includes a plurality of fixed pipe rails (1) of ordering in proper order, its characterized in that: a gap is formed between the fixed pipe rails (1), a bearing block (11) is arranged in the gap, and the gap comprises a lifting device (2), and the lifting device (2) can drive the bearing block (11) to move up and down;
the device is characterized by further comprising a material carrying device (3) and a delivery device (4), wherein the material carrying device (3) is provided with a hook (31) capable of being hung on a fixed pipe rail (1) to move, and the delivery device (4) is provided with a bearing table (41) capable of carrying the material carrying device (3) and a power device (42) for driving the bearing table (41) to move;
the lifting device (2) is provided with a first sensor (22) for sensing the position of the material loading device (3), and the lifting device (2) is also provided with a second sensor (23) for sensing the weight of the material loading device (3);
the device further comprises a chain transmission device (5) corresponding to the fixed pipe rail (1), wherein the chain transmission device (5) has an intermittent operation mode, the chain transmission device (5) is provided with a push block (51), and the push block (51) can push the hook (31) to move;
the upper end of the hook (31) is provided with an arc-shaped shell which can be pushed by the pushing block (51) in a propping way, a cavity is formed in the shell, a roller (32) is arranged in the cavity, the roller (32) is provided with a concave wall matched with the fixed pipe rail (1), the bearing block (11) is provided with a concave position, and a convex part capable of supporting the concave wall of the roller (32) is arranged in the concave position;
the carrying device (4) is provided with a mounting frame (401) and a guide column (43), the guide column (43) and the power device (42) are both mounted on the mounting frame (401), triangular support rods (402) are arranged on two sides of the mounting frame (401), the bearing table (41) is provided with a triangular support (412), and the power device (42) can drive the triangular support (412) to move along the guide column (43);
the material carrying device (3) is provided with a central column (34), the bearing table (41) is provided with a calibration position (411) matched with the central column (34), and one end, close to the hook (31), of the central column (34) is provided with a limiting rod (33).
2. A pipe rail bridging mechanism for a production line according to claim 1, wherein: the lifting device (2) is a secondary cylinder, and a shell (21) fixedly connected with the fixed pipe rail (1) is arranged at the fixed end of the lifting device (2).
3. A pipe rail bridging mechanism for a production line according to claim 1, wherein: a clamping hand (44) is arranged above the bearing table (41).
4. A pipe rail bridging mechanism for a production line according to any one of claims 1 to 3, wherein: the consignment device (4) is provided with a controller (45).
CN202111549087.4A 2021-12-17 2021-12-17 Pipe rail bridging type mechanism of production line Active CN114212508B (en)

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Application Number Priority Date Filing Date Title
CN202111549087.4A CN114212508B (en) 2021-12-17 2021-12-17 Pipe rail bridging type mechanism of production line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111549087.4A CN114212508B (en) 2021-12-17 2021-12-17 Pipe rail bridging type mechanism of production line

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CN114212508A CN114212508A (en) 2022-03-22
CN114212508B true CN114212508B (en) 2024-01-09

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10181862A (en) * 1996-12-25 1998-07-07 Tani Denki Kogyo Kk Bridge carrier device
DE10106191A1 (en) * 2001-02-10 2002-08-29 Stein Automation Gmbh Transporter for work pieces etc. on palettes etc. has parallel longitudinal track sections each with lifting device to ease work piece transfer
JP2003040441A (en) * 2001-07-24 2003-02-13 Honda Motor Co Ltd Work transfer device
JP2005126189A (en) * 2003-10-23 2005-05-19 Open Engineer Service:Kk Parts feeding mechanism
CN201337677Y (en) * 2008-12-26 2009-11-04 青岛建华食品机械制造有限公司 Empty return hook tool disinfecting device
CN103896051A (en) * 2014-04-04 2014-07-02 中山长健医药包装技术有限公司 Automatic pipe-feeding reverse pipe sorting mechanism of packaging pipe packager
CN107176429A (en) * 2016-03-10 2017-09-19 山东科技大学 Mechanical system of serving is allocated with aerial suspension automatically in a kind of fast food restaurant
CN207058330U (en) * 2016-10-11 2018-03-02 天津方准因特雷准科技有限公司 A kind of cast member flash sander automatic charging chucking device
CN208643954U (en) * 2018-05-16 2019-03-26 深圳市华龙精密模具有限公司 The tubulature device of the automatic Trim Molding equipment of semiconductor integrated circuit
CN111071740A (en) * 2019-12-30 2020-04-28 青岛万成锚链有限公司 Automatic feeding machine
CN111689220A (en) * 2020-06-19 2020-09-22 吴红元 Material feeding unit for machine production
CN211687292U (en) * 2019-12-24 2020-10-16 深圳市富达百年科技有限公司 Power assembly for intelligent feeder

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10181862A (en) * 1996-12-25 1998-07-07 Tani Denki Kogyo Kk Bridge carrier device
DE10106191A1 (en) * 2001-02-10 2002-08-29 Stein Automation Gmbh Transporter for work pieces etc. on palettes etc. has parallel longitudinal track sections each with lifting device to ease work piece transfer
JP2003040441A (en) * 2001-07-24 2003-02-13 Honda Motor Co Ltd Work transfer device
JP2005126189A (en) * 2003-10-23 2005-05-19 Open Engineer Service:Kk Parts feeding mechanism
CN201337677Y (en) * 2008-12-26 2009-11-04 青岛建华食品机械制造有限公司 Empty return hook tool disinfecting device
CN103896051A (en) * 2014-04-04 2014-07-02 中山长健医药包装技术有限公司 Automatic pipe-feeding reverse pipe sorting mechanism of packaging pipe packager
CN107176429A (en) * 2016-03-10 2017-09-19 山东科技大学 Mechanical system of serving is allocated with aerial suspension automatically in a kind of fast food restaurant
CN207058330U (en) * 2016-10-11 2018-03-02 天津方准因特雷准科技有限公司 A kind of cast member flash sander automatic charging chucking device
CN208643954U (en) * 2018-05-16 2019-03-26 深圳市华龙精密模具有限公司 The tubulature device of the automatic Trim Molding equipment of semiconductor integrated circuit
CN211687292U (en) * 2019-12-24 2020-10-16 深圳市富达百年科技有限公司 Power assembly for intelligent feeder
CN111071740A (en) * 2019-12-30 2020-04-28 青岛万成锚链有限公司 Automatic feeding machine
CN111689220A (en) * 2020-06-19 2020-09-22 吴红元 Material feeding unit for machine production

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