CN112809440B - Material conveying belt of cutting machine - Google Patents
Material conveying belt of cutting machine Download PDFInfo
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- CN112809440B CN112809440B CN202011622467.1A CN202011622467A CN112809440B CN 112809440 B CN112809440 B CN 112809440B CN 202011622467 A CN202011622467 A CN 202011622467A CN 112809440 B CN112809440 B CN 112809440B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q7/00—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting
- B23Q7/02—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting by means of drums or rotating tables or discs
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Abstract
The invention discloses a material conveying belt of a cutting machine, which comprises a conveying belt and a rack, wherein rotating rollers are arranged at two ends of the rack, the conveying belt is sleeved on the rotating rollers in a rotating manner, a bias sensor is arranged at the front end of the rack, a correcting device and a retaining device are arranged in the rack, the correcting device comprises correcting components symmetrically arranged at two sides of the conveying belt, a correcting rod is arranged between the correcting components, two ends of the correcting rod are respectively hinged with the correcting components, the correcting components are used for adjusting the height of the end part of the correcting rod, the retaining device comprises a retaining rod horizontally arranged in the rack, the retaining rod is horizontally arranged in the rack and used for compressing the conveying belt and keeping the conveying belt horizontal, and the retaining rod is connected with a height adjusting component; the advantage is that can realize the automatic correction of conveyer belt through control correcting unit and holding device, and holding device can realize when the conveyer belt is lax, in time adjusts the elasticity degree of conveyer belt, ensures that the conveyer belt keeps the laminating between the live-rollers in all the time and the frame, reduces the conveyer belt skew to appear.
Description
Technical Field
The invention particularly relates to a material conveying belt of a cutting machine.
Background
In the traditional cutting mode, a sample is cut by a handheld cutting tool, namely manual cutting; the manual cutting is flexible and convenient, but the manual cutting quality is poor, the size error is large, the material waste is large, and the production efficiency is low. Along with the development of the society and the requirement of production on cutting precision, the cutting machine technology is rapidly developed, the appearance of a numerical control cutting machine tool greatly improves the cutting precision of samples, and the numerical control cutting machine tool is suitable for large-batch automatic production, and has high time-saving, labor-saving and efficiency, so that the numerical control cutting machine is mostly adopted in the existing industrial production field to cut the samples. The numerical control cutting machine mainly comprises a machine tool, a conveyor belt, a cutting machine head and the like, wherein the cutting machine head is accurately controlled through a numerical control technology, so that the accurate cutting of articles is realized, and the prior art also focuses on improving the cutting machine head so as to improve the cutting precision and efficiency. However, in practical use, a sample to be cut needs to be conveyed by the conveyor belt and conveyed to a cutting area of the cutting head, so that the running state of the conveyor belt is also one of factors influencing the cutting accuracy of the cutting machine, and a material conveyor belt of the cutting machine, which is reliable in conveying and can be automatically corrected, is needed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the material conveying belt of the cutting machine is reliable in conveying and capable of conducting offset correction.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a cutting machine material conveyer belt, includes conveyer belt, frame, the both ends of frame all be provided with the live-rollers, the conveyer belt rotate the cover and establish in the live-rollers, the front end of frame be provided with and be used for detecting whether the conveyer belt squints the offset sensor, the frame inside be provided with and be used for adjusting the correcting unit of conveyer belt offset and be used for keeping the horizontally holding device of conveyer belt, correcting unit including the symmetry set up the correction subassembly in the conveyer belt both sides, the correction subassembly between be provided with the correction rod that is used for compressing tightly the conveyer belt, the both ends of correction rod articulated mutually with the correction subassembly respectively, the correction subassembly be used for adjusting the height of correction rod tip, holding device include the holding pole that the level set up, holding pole level set up in the frame and be used for compressing tightly the conveyer belt and keep the conveyer belt level, the holding pole be connected with height adjustment assembly, height adjustment assembly be used for adjusting the height that keeps the pole.
Furthermore, the device also comprises a controller for controlling the correcting device and the holding device, wherein the controller is electrically connected with the bias sensor; the automatic correction device has the advantages that the automatic correction of the conveyor belt of the cutting machine can be realized by controlling the correction device and the retaining device through the controller, and the waste of manpower and material resources is reduced.
Furthermore, the correcting assembly comprises a shell, an electric adjusting rod and an adjusting block, wherein the shell is fixed with the rack, the electric adjusting rod is arranged in the shell, a telescopic shaft of the electric adjusting rod is connected with the adjusting block, a spherical mounting cavity is arranged in the adjusting block, a correcting ball is rotatably arranged in the mounting cavity, one end of the correcting rod penetrates out of the correcting ball through a ball center, an adjusting hole is formed in the shell, and one end of the correcting rod extends out of the adjusting hole; the cooperation of the correcting ball and the adjusting block through setting up can realize the articulated of correcting lever and correction subassembly, and the regulation hole through vertical setting can ensure that the tip of correcting lever reciprocates along vertical direction, ensures the reliability of adjusting, and this implementation simple structure, the dismouting of being convenient for is maintained, adopts the cooperation of correcting ball and adjusting block to effectively prolong the life of correction subassembly simultaneously.
Furthermore, the two ends of the holding rod are symmetrically provided with mounting tables, the mounting tables are vertically and fixedly arranged in the rack, the mounting tables are provided with first mounting holes along the vertical direction, and one end of the holding rod is movably arranged in the first mounting holes.
Furthermore, the mounting table is provided with a correction sensor for detecting whether the conveying belt is corrected in place, and the correction sensor is electrically connected with a controller of the material conveying belt of the cutting machine; the method has the advantages that the real-time feedback of the correction result can be realized through the setting of the correction sensor, so that the cyclic control of correction is realized, and the correction accuracy and the correction speed are improved.
Furthermore, the vertical slide rail that is located first mounting hole both sides that is provided with of mount table, the altitude mixture control subassembly include holder and telescopic pull rod, the holder include the fixed plate that the level set up, the vertical fixed regulating plate that is provided with in both ends of fixed plate, the regulating plate be provided with the corresponding spout of slide rail, the regulating plate still seted up with the corresponding second mounting hole of first mounting hole, the holding rod stretch out the second mounting hole, pull rod and frame be fixed mutually, the telescopic shaft of pull rod with the middle part of fixed plate be connected.
Furthermore, a tension sensor is arranged between the fixed plate and the pull rod; can detect the rate of tension of conveyer belt in real time through force sensor, and the higher response speed of detection efficiency is fast, and then the rate of tension between control conveyer belt and the live-rollers, avoids the too big life of guarantee conveyer belt of tension, avoids the phenomenon that the too little conveyer belt of tension leads to appearing the skew easily simultaneously.
Furthermore, the lower end of the fixing plate is fixedly provided with a sleeve which is movably nested outside the pull rod; the advantage lies in, telescopic setting can further ensure the altitude mixture control subassembly and reciprocate along vertical direction, and can effectively ensure the isolated of pull rod tip to the outside, reduces the entering of dust debris, ensures altitude mixture control subassembly's reliable operation.
Compared with the prior art, the automatic correction device has the advantages that the correction device for correcting and adjusting and the holding device for holding the conveying belt to be horizontal are arranged in the frame, automatic correction of a conveying place can be achieved by controlling the action of the correction device and the holding device, namely when the offset sensor detects that the conveying belt deviates, the conveying belt can be restored to a linear state through the correction device, and the holding device can timely adjust the tightness degree of the conveying belt when the conveying belt is loosened, so that the conveying belt is always attached to the rotating rollers on the frame, the deviation of the conveying belt is further reduced, and the cutting accuracy of the cutting machine is further improved. The full automation of conveyer belt is rectified to automated control's correcting unit and holding device realization, need shut down when having the adoption manual correction, and need make the conveyer belt relax and then can realize artifical adjustment through disassembling the part, this adjustment mode is consuming time power, adopt full-automatic correction mode can effectively reduce the cost of labor of enterprise, realize the skew under the state of not shutting down, and can appear the earlier stage of skew at the conveyer belt, in time rectify when the trace skew appears promptly, avoid the offset to enlarge, ensure the production efficiency of cutting machine, the reliable operation of guarantee conveyer belt.
Drawings
FIG. 1 is a schematic view of the mounting of the housing of the present invention;
FIG. 2 is a schematic view of the installation of a turning roll according to the present invention;
FIG. 3 is a schematic view of the mounting of the offset sensor of the present invention;
FIG. 4 is a schematic view of the installation of the alignment device and the holding device of the present invention;
FIG. 5 is a schematic view of a calibration device according to the present invention;
FIG. 6 is a cross-sectional view of a calibration assembly according to one embodiment of the present invention;
FIG. 7 is a second schematic cross-sectional view of the calibration assembly of the present invention;
FIG. 8 is a schematic view of the structure of the retaining device of the present invention;
FIG. 9 is a schematic view of the structure of the mounting table of the present invention;
fig. 10 is a schematic cross-sectional view of a holding device according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in the accompanying drawings 1-10, a material conveying belt of a cutting machine comprises a conveying belt 1 and a frame 2, wherein two ends of the frame 2 are respectively provided with a rotating roller 3, the conveying belt 1 is rotatably sleeved on the rotating rollers 3, two sides of the front end of the frame 2 are respectively provided with a bias sensor 4 for detecting whether the conveying belt 1 deviates, and the frame 2 is internally provided with a correcting device 5 for adjusting the deviation of the conveying belt 1 and a holding device 6 for holding the conveying belt 1 to be horizontal.
The correcting device 5 comprises correcting components 5.1 symmetrically arranged on two sides of the conveying belt 1, correcting rods 5.2 used for pressing the conveying belt 1 are arranged between the correcting components 5.1, two ends of each correcting rod 5.2 are hinged to the correcting components 5.1 respectively, and the correcting components 5.1 are used for adjusting the height of the end portions of the correcting rods 5.2. The correcting assembly 5.1 comprises a shell 5.11, an electric adjusting rod 5.12 and an adjusting block 5.13, wherein the shell 5.11 is fixed with the rack 2, the electric adjusting rod 5.12 is arranged in the shell 5.11, a telescopic shaft of the electric adjusting rod 5.12 is connected with the adjusting block 5.13, a spherical mounting cavity is arranged in the adjusting block 5.13, a correcting ball 5.14 is rotatably arranged in the mounting cavity, one end of a correcting rod 5.2 penetrates out of the correcting ball 5.14 through a ball center, the shell 5.11 is provided with an adjusting hole 5.15 along the vertical direction, one end of the correcting rod 5.2 extends out of the adjusting hole 5.15, and the correcting rod 5.2 is hinged with the adjusting block 5.13 through the correcting ball 5.14. When the correcting device 5 works, namely the electric adjusting rod 5.12 drives the adjusting block 5.13 to move up and down when lifting, due to the fact that the correcting ball 5.14 is in running fit with the adjusting block 5.13, one end, connected with the correcting ball 5.14, of the correcting rod 5.2 can move up and down, and due to the arrangement of the adjusting hole 5.15, the correcting rod 5.2 can be effectively guaranteed to move up and down along the vertical direction.
The holding device 6 comprises a horizontally arranged holding rod 6.2, the holding rod 6.2 is horizontally arranged in the frame 2 and used for pressing the conveying belt 1 and holding the conveying belt 1 horizontally, the holding rod 6.2 is connected with a height adjusting assembly 6.1, and the height adjusting assembly 6.1 is used for adjusting the height of the holding rod 6.2. Specifically, two ends of a holding rod 6.2 are symmetrically provided with mounting platforms 6.3, the mounting platforms 6.3 are vertically and fixedly arranged in the rack 2, meanwhile, the mounting platforms 6.3 are provided with first mounting holes 6.31 in the vertical direction, and one end of the holding rod 6.2 is movably arranged in the first mounting holes 6.31. The mounting table 6.3 is vertically provided with slide rails 6.32 located on two sides of the first mounting hole 6.31, the height adjusting assembly 6.1 comprises a holder and a telescopic pull rod 6.11, the holder comprises a fixing plate 6.12 horizontally arranged, adjusting plates 6.13 are vertically and fixedly arranged at two ends of the fixing plate 6.12, each adjusting plate 6.13 is provided with a slide groove 6.14 corresponding to the slide rail 6.32, each adjusting plate 6.13 is further provided with a second mounting hole 6.15 corresponding to the first mounting hole 6.31, the holding rod 6.2 extends out of the second mounting hole 6.15, the lower end of the pull rod 6.11 is fixed with the rack 2, a telescopic shaft of the pull rod 6.11 is connected with the middle part of the fixing plate 6.12, and a tension sensor 6.5 is arranged between the fixing plate 6.12 and the pull rod 6.11. The lower end of the fixed plate 6.12 is also fixedly provided with a sleeve 6.16, and the sleeve 6.16 is movably sleeved on the outer side of the pull rod 6.11.
The invention is also provided with a controller for controlling the correcting device 5 and the holding device 6, the controller is electrically connected with the offset sensor 4, the inner sides of the two mounting platforms 6.3 are respectively provided with a correcting sensor 6.4 for detecting whether the conveying belt 1 is corrected in place, and the correcting sensor 6.4 is electrically connected with the controller of the material conveying belt of the cutting machine. Wherein, the offset sensor 4 and the correction sensor 6.4 are both proximity sensors, and the electric adjusting rod 5.12 and the pull rod 6.11 are both telescopic electric push rods. The controller controls the proximity sensor to detect and controls the electric push rod to stretch and retract.
The working process of the invention is as follows: after the controller controls the conveyor belt to work, the offset sensors 4 on both sides of the frame 2 are controlled to inspect the conveyor belt 1, and taking fig. 2 as an example to illustrate, when the conveyor belt 1 deviates to the left side, the offset sensor 4 on the left side responds at this time, the controller controls the electric adjusting rod 5.12 on the left side to contract downwards, at this time, the correcting rod 5.2 inclines to the left side, and the conveyor belt 1 is subjected to pressure on the right side of the correcting rod 5.2 in the rotating process, so that the conveyor belt can deviate to the right side in the slow rotating process. Meanwhile, a mounting table 6.3 is fixedly arranged in the frame 2, and a correction sensor 6.4 is fixedly arranged on the mounting table 6.3 and used for continuously detecting whether the correction of the conveying belt 1 is finished, when the correction sensors 6.4 on the two sides of the conveying belt 1 detect the conveying belt 1, the conveying belt 1 is positioned between the two correction sensors 6.4, namely the correction is finished; after the correction is finished, the controller controls the correcting components 5.1 on the two sides of the conveying belt 1 to be kept flush.
When the conveyer belt 1 deflects to the right, the right offset sensor 4 responds, the controller controls the right electric adjusting rod 5.12 to contract downwards, the correcting rod 5.2 inclines to the right, and the conveyer belt 1 is pressed by the correcting rod 5.2 to the left during rotation, so the conveyer belt 1 deflects to the left during slow rotation. Meanwhile, a mounting table 6.3 is fixedly arranged in the frame 2, and a correction sensor 6.4 is fixedly arranged on the mounting table 6.3 and used for continuously detecting whether the correction of the conveying belt 1 is finished, when the correction sensors 6.4 on the two sides of the conveying belt 1 detect the conveying belt 1, the conveying belt 1 is positioned between the two correction sensors 6.4, namely the correction is finished; after the correction is finished, the controller controls the correcting components 5.1 on the two sides of the conveying belt 1 to be kept flush.
Whether the conveyer belt 1 deviates or not is checked through offset sensing in the correcting process, the conveyer belt 1 is corrected through the lifting matching correcting rod 5.2 of the correcting component 5.1 arranged on the two sides of the conveyer belt 1, whether the conveyer belt is corrected in place is detected in real time through the correcting sensor 6.4 and fed back to the controller, and the offset sensor 4 is controlled by the controller to continuously detect in real time to form circulation until the conveyer belt 1 is corrected completely.
The loosening phenomenon can occur in the long-term use process of the conveying belt 1 due to the problems of tension, loss and the like, the loosening of the conveying belt 1 is also one of the reasons for the deviation of the conveying belt 1, the retaining device 6 can be used for controlling the tension sensor 6.5 to detect the tension of the conveying belt 1 in real time when the conveying belt 1 is loosened, when the numerical value of the tension sensor 6.5 is detected to be reduced, the conveying belt 1 is loosened, the pull rod 6.11 can be controlled to contract, the retaining rod 6.2 vertically moves downwards through the retaining frame, the tension of the conveying belt 1 is increased, the conveying belt 1 is enabled to be more attached to the rotating roller 3, and meanwhile, the level of the retaining rod 6.2 can be guaranteed due to the matching of the sliding rail 6.32 and the sliding groove 6.14 which are vertically arranged between the mounting table 6.3 and the adjusting plate 6.13. On the contrary, when the tension sensor 6.5 detects that the tension of the conveyer belt 1 is large, the controller controls the pull rod 6.11 to ascend, so that the tension of the conveyer belt 1 is reduced, the conveyer belt 1 is prevented from being damaged or broken due to the overlarge tension, and the service life of the conveyer belt is prolonged.
When the controller adjusts the correcting device 5 to correct the conveying belt 1, the retaining device 6 can be controlled to act at the same time, so that the conveying belt 1 and the rotating roller 3 are always kept in a fit state, and the phenomenon that the conveying belt 1 deviates is reduced. The automatic correction of the conveyor belt can be realized through the cooperation of the controller, the offset sensor 4, the correction sensor 6.4, the correction device 5 and the holding device 6, the correction efficiency is improved, and the manual maintenance cost is reduced.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (5)
1. A material conveying belt of a cutting machine comprises a conveying belt and a rack, wherein rotating rollers are arranged at two ends of the rack, the conveying belt is sleeved on the rotating rollers in a rotating mode, and the material conveying belt is characterized in that a bias sensor for detecting whether the conveying belt deviates or not is arranged at the front end of the rack, a correcting device for adjusting the deviation of the conveying belt and a retaining device for keeping the conveying belt horizontal are arranged in the rack, the correcting device comprises correcting components symmetrically arranged at two sides of the conveying belt, a correcting rod for pressing the conveying belt is arranged between the correcting components, two ends of the correcting rod are respectively hinged with the correcting components, the correcting components are used for adjusting the height of the end portion of the correcting rod, the retaining device comprises a horizontally arranged retaining rod, the retaining rod is horizontally arranged in the rack and used for pressing the conveying belt and keeping the conveying belt horizontal, the retaining rod is connected with a height adjusting component, the height adjusting component is used for adjusting the height of the retaining rod, the correcting component comprises a shell, an electric adjusting rod and an adjusting block, the shell is fixed with the rack, a telescopic shaft of the electric adjusting rod is connected with the adjusting block, one end of the spherical adjusting ball extending out of the correcting rod is provided with a correcting ball, and one end of the correcting rod is provided with a correcting ball extending out adjusting hole;
mounting platforms are symmetrically arranged at two ends of the retaining rod, the mounting platforms are vertically and fixedly arranged in the rack, first mounting holes are formed in the mounting platforms in the vertical direction, and one end of the retaining rod is movably arranged in the first mounting holes; the vertical slide rail that is located first mounting hole both sides that is provided with of mount table, altitude mixture control subassembly include holder and telescopic pull rod, the holder include the fixed plate that the level set up, the vertical fixed regulating plate that is provided with in both ends of fixed plate, the regulating plate be provided with the corresponding spout of slide rail, the regulating plate still seted up with first mounting hole corresponding second mounting hole, the holding rod stretch out the second mounting hole, pull rod and frame fixed mutually, the telescopic shaft of pull rod with the middle part of fixed plate be connected, just fixed plate and pull rod between be provided with force transducer.
2. The cutting machine material conveyor according to claim 1, further comprising a controller for controlling the alignment device and the retention device, the controller being electrically connected to the offset sensor.
3. The material conveying belt of the cutting machine as claimed in claim 1, wherein the mounting table is provided with a calibration sensor for detecting whether the conveying belt is calibrated in place, and the calibration sensor is electrically connected with a controller of the material conveying belt of the cutting machine.
4. The material conveying belt for the cutting machine according to claim 1, wherein a sleeve is fixedly arranged at the lower end of the fixing plate, and the sleeve is movably sleeved on the outer side of the pull rod.
5. The material conveying belt of the cutting machine as claimed in claim 2, wherein the controller adjusts the correcting device to correct the conveying belt and controls the holding device to operate simultaneously, so that the conveying belt and the rotating roller are always kept attached to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011622467.1A CN112809440B (en) | 2020-12-31 | 2020-12-31 | Material conveying belt of cutting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011622467.1A CN112809440B (en) | 2020-12-31 | 2020-12-31 | Material conveying belt of cutting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112809440A CN112809440A (en) | 2021-05-18 |
| CN112809440B true CN112809440B (en) | 2023-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011622467.1A Active CN112809440B (en) | 2020-12-31 | 2020-12-31 | Material conveying belt of cutting machine |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202296126U (en) * | 2011-09-30 | 2012-07-04 | 东莞市富荣食品机械有限公司 | Automatic deviation-correcting device for conveyer belt |
| TW201540622A (en) * | 2014-02-17 | 2015-11-01 | Jud Ag Papiermaschinen | Installation with at least one continuous conveyor belt for conveying materials and products |
| CN105397170A (en) * | 2015-11-30 | 2016-03-16 | 郑州金泰制罐有限公司 | Metal sheet automatic cutting production line |
| CN206466606U (en) * | 2016-12-30 | 2017-09-05 | 绍兴市禾木生物质燃料有限公司 | A kind of conveyer belt |
| CN206510229U (en) * | 2017-03-02 | 2017-09-22 | 广东赛因迪科技股份有限公司 | A kind of ceramic bead cutter with high-precision correction function |
| CN208199646U (en) * | 2018-05-28 | 2018-12-07 | 杰克缝纫机股份有限公司 | A kind of automatic deviation rectifying device of conveyer belt |
-
2020
- 2020-12-31 CN CN202011622467.1A patent/CN112809440B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202296126U (en) * | 2011-09-30 | 2012-07-04 | 东莞市富荣食品机械有限公司 | Automatic deviation-correcting device for conveyer belt |
| TW201540622A (en) * | 2014-02-17 | 2015-11-01 | Jud Ag Papiermaschinen | Installation with at least one continuous conveyor belt for conveying materials and products |
| CN105397170A (en) * | 2015-11-30 | 2016-03-16 | 郑州金泰制罐有限公司 | Metal sheet automatic cutting production line |
| CN206466606U (en) * | 2016-12-30 | 2017-09-05 | 绍兴市禾木生物质燃料有限公司 | A kind of conveyer belt |
| CN206510229U (en) * | 2017-03-02 | 2017-09-22 | 广东赛因迪科技股份有限公司 | A kind of ceramic bead cutter with high-precision correction function |
| CN208199646U (en) * | 2018-05-28 | 2018-12-07 | 杰克缝纫机股份有限公司 | A kind of automatic deviation rectifying device of conveyer belt |
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| CN112809440A (en) | 2021-05-18 |
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