CN113478219A - Pantograph assembly line - Google Patents
Pantograph assembly line Download PDFInfo
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- CN113478219A CN113478219A CN202110772996.8A CN202110772996A CN113478219A CN 113478219 A CN113478219 A CN 113478219A CN 202110772996 A CN202110772996 A CN 202110772996A CN 113478219 A CN113478219 A CN 113478219A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P21/00—Machines for assembling a multiplicity of different parts to compose units, with or without preceding or subsequent working of such parts, e.g. with programme control
- B23P21/004—Machines for assembling a multiplicity of different parts to compose units, with or without preceding or subsequent working of such parts, e.g. with programme control the units passing two or more work-stations whilst being composed
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Abstract
The invention discloses a pantograph assembly production line, and relates to the technical field of locomotive accessory production. The device comprises a material area, an assembly area and a test area. The material area comprises a material storage area and an operation island for storing accessories and semi-finished products, and the assembly area comprises a general assembly production line and a sub-assembly production line which are parallel to each other. The assembly area is arranged between the material storage area and the test area, and the operation island is arranged between the general assembly production line and the sub-assembly production line. The assembly production line is provided with at least one assembly car and at least one first AGV dolly, the first AGV dolly bears the assembly car and is in the circulation on the assembly production line. The layout of the whole production line is optimized, so that materials are delivered, the pantograph is produced, the quality of the pantograph is inspected, a smooth action line can be formed, and the production efficiency is improved. And the punctual delivery is realized by optimizing the storage and delivery of materials. Through optimizing the working mode of the final assembly line, the metronomic production and control are realized.
Description
Technical Field
The invention relates to the technical field of locomotive accessory production, in particular to a pantograph assembly production line.
Background
A new industrial revolution is the deep integration of information technology and manufacturing industry, is a new industrial revolution initiated by the breakthrough of superposing new energy, new materials and the like on the basis of Internet of things and service networking by taking the digitalization, networking and intellectualization of the manufacturing industry as a core, and brings a deep revolution to the manufacturing industry in the world. The intelligent transformation is implemented, and an intelligent manufacturing new mode rail transit equipment enterprise is initiated to adapt to the future market demand, accelerate the departure and adapt to the inevitable selection of new normal state of economy in China.
The existing pantograph production line adopts a fixed station position production mode, 6 parallel pantograph final assembly stations are arranged, and each final assembly station completes all final assembly procedures of a pantograph; and 5 subpackaging stations are arranged simultaneously, and each subpackaging station completes all subpackaging procedures. A subpackage material storage area is arranged at the side of the subpackage station; and a final assembly material storage area is arranged at the side of the final assembly station. The sub-packaging station and the final assembly station are relatively independent, and all sub-packaged materials are transferred to the side of the final assembly station according to the type of the pantograph.
Therefore, in the existing production mode, the materials need to be manually delivered, split charging semi-finished products exist, the materials need to be delivered again, and then the materials are transported to each final assembly station, so that the problems of high material transportation difficulty and untimely material delivery exist. The production efficiency cannot be improved, and the metronomic production cannot be realized.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a pantograph assembly production line aiming at the defects of the prior art, wherein the temporary storage of semi-finished products is realized through an operation island between a final assembly production line and a sub-assembly production line; the AGV trolley is adopted to realize the distribution of materials and semi-finished products, and the takt circulation of the final assembly process is realized.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a pantograph assembly production line comprises a material area, an assembly area and a test area. The material area comprises a material storage area and an operation island for storing accessories and semi-finished products, and the assembly area comprises a general assembly production line and a sub-assembly production line which are parallel to each other. The assembly area is arranged between the material storage area and the test area, and the operation island is arranged between the general assembly production line and the sub-assembly production line. The assembly production line comprises at least one assembly car and at least one first AGV car, and the first AGV car bears the assembly car and flows on the assembly production line.
The material area is specifically an area for storing materials in a production line. The assembling area is specifically an area for assembling the pantograph in a production line. The test area is specifically an area used for detecting whether finished pantograph products are qualified in a production line. The assembly area is located the material deposit the district with between the test area, can realize the material delivery in proper order, the production of pantograph and pantograph quality inspection form smooth action line, improve production efficiency. The assembly line and the sub-assembly line are arranged on the operating island, and the sub-assembly line are arranged on the operating island. The assembly line includes at least one assembly vehicle and at least one first AGV cart, and as described in patent document CN201810315790.0, the AGV means an "automatic guided transport vehicle", which is a transport vehicle equipped with an electromagnetic or optical automatic guide device, can travel along a predetermined guide path, and has safety protection and various transfer functions. First AGV dolly bears the total loading is in the total assembly line circulation, accessible control first AGV dolly comes the management and control production process, can realize the beat circulation of total assembly line. And when the total loading and the AGV trolley number are increased, the production beat is accelerated.
Specifically, the assembly line sequentially comprises an underframe assembly station, an air circuit assembly station, a pantograph lifting assembly station, a lower arm rod assembly station, an upper frame assembly station and a pantograph head assembly station. The assembly station can complete one of the assembly procedures, the whole assembly procedure can be combined into a production line, and the assembly work efficiency is improved.
Specifically, the bow final assembly station is adjacent to the test zone. The pantograph general assembly station completes the last process, so that a complete pantograph can be produced on the station, the pantograph is transferred to a test area from the pantograph general assembly station, and the requirements of routine test points of the pantograph are met, so that the test can be completed to determine whether the pantograph is a qualified product.
Specifically, the partial shipment assembly line is in the gas circuit assembly station rise bow assembly station down the armed lever assembly station go up the frame assembly station with the position that the bow assembly station corresponds is equipped with gas circuit partial shipment station, rises bow partial shipment station, lower armed lever partial shipment station, upper frame partial shipment station and bow partial shipment station in proper order. Can realize every the partial shipment station is accomplished one of them partial shipment process, accomplishes the partial shipment back, can directly place semi-manufactured goods the operation island is directly taken by the final assembly station that corresponds, when improving partial shipment work efficiency, has also improved final assembly work efficiency.
Further, the partial shipment station is including the partial shipment workstation, the partial shipment workstation is equipped with the installation interface of compatible each type of pantograph spare part. Therefore, the pantograph can be suitable for producing various types of pantographs.
Specifically, underarm pole partial shipment station is equipped with underarm pole pressure equipment, underarm pole pressure equipment includes two pressure equipment mechanisms, two be equipped with the guide rail between the pressure equipment mechanism. The guide rail makes the press-fitting mechanism can slide along the axial direction of the lower arm rod, and the press-fitting mechanism is compatible with press-fitting of the lower arm rods of various types of pantographs.
Specifically, both ends of the press-fitting mechanism are provided with pressure heads, and the pressure heads are provided with pressure sensors. Pressure heads are arranged at two ends of the press-fitting mechanism, so that the two ends of the lower arm rod of the pantograph can be simultaneously pressed, the pressure of the press-fitting can be known after the pressure sensor is installed, and the quality of the lower arm rod is more conveniently controlled.
Specifically, the assembly area and the test area are provided with hoisting equipment. The loading and unloading of large parts are more convenient.
Specifically, the material area further comprises a second AGV trolley for transferring the material; the running route is between the material storage area and the operation island. Use the second AGV dolly is followed the accessory is deposited the district and is transported extremely the operation island realizes the automatic delivery of material, makes things convenient for the staff to take the material, then accomplishes partial shipment work and generates semi-manufactured goods. Use the material that the second AGV dolly will not need the partial shipment is followed material district transports extremely the operation island makes things convenient for the staff directly to take extremely the final assembly line.
Specifically, first AGV dolly with the second AGV dolly all is equipped with the camera, pastes the two-dimensional code that is used for navigation on its route of traveling. The camera reads two-dimension code information, obtains the position and the angle deviation of first AGV dolly or second AGV dolly, control system is at first AGV dolly or the in-process that second AGV dolly moved next two-dimension code is adjusted. And after reaching the target point, the actions of speed reduction, stopping, steering, material taking and placing and the like are performed.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the assembly area is arranged between the material storage area and the test area, the operation island is arranged between the assembly line and the sub-assembly line, the first AGV trolley is used for bearing the flow of the assembly truck in the assembly line, and the second AGV trolley is used for transferring accessories from the material storage area to the operation island, so that the layout of the whole production line is optimized, the material distribution, the production of the pantograph and the quality inspection of the pantograph can be realized, a smooth action line can be formed, and the production efficiency is improved. And the punctual delivery is realized by optimizing the storage and delivery of materials. Through optimizing the working mode of the final assembly line, the metronomic production and control are realized. And hoisting equipment is adopted to realize the loading and unloading of the large parts.
Drawings
Fig. 1 is a schematic general layout diagram of a pantograph assembly line according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a lower arm press-fitting apparatus in a pantograph assembly line according to an embodiment of the present invention.
Wherein, 1 is the material district, 101 is the operation island, 102 is the material storage area, 2 is the assembly area, 201 is the partial shipment assembly line, 202 is the assembly line, 3 is the test area, 301 is the test bench, 4 is gas circuit partial shipment station, 5 is rising bow partial shipment station, 6 is lower arm rod partial shipment station, 7 is upper frame partial shipment station, 8 is bow partial shipment station, 9 is chassis assembly station, 10 is gas circuit assembly station, 11 is rising bow assembly station, 12 is lower arm rod assembly station, 13 is upper frame assembly station, 14 is bow head assembly station, 15 is the pressure head, 151 is the first pressure head of position, 152 is second pressure heads, 16 is the pressure equipment structure, 17 is the guide rail, 18 is KBK, 19 is the all-in-one machine support that fills electric pile, 20 is the AGV dolly.
Detailed Description
As shown in fig. 1, a pantograph assembly line according to an embodiment of the present invention includes a material area 1, an assembly area 2, and a test area 3. The material area 1 is specifically an area for storing materials in a production line. The assembling area 2 is specifically an area for assembling the pantograph in the production line. The test area 3 is specifically an area used for inspecting whether finished pantograph products are qualified in a production line.
The material area 1 comprises a working island 101 and a material storage area 102, and the assembly area 2 comprises a sub-assembly production line 201 and a final assembly production line 202 which are arranged in parallel. The assembly area 2 is arranged between the material storage area 102 and the test area 3. The material storage area 102 and the assembly area 2 are further provided with an AGV charging pile 20, and when the AGV does not have a task, the AGV charging pile can stop at the position of the charging pile 20 to wait for a next task instruction.
The test zone 3 is provided with two test stands 301. The test bed 301 comprises a control host, a touch screen, a display screen, a lifting bow tension testing device, a lifting bow time testing device, a gas circuit control device, an operation platform, a product mounting platform, a checking device, a printer and the like, and is used for completing the requirements of pantograph routine test item points. The test bed 301 adopts an LED display screen to display data such as a height value, a tension value, an air pressure value and the like of a tested piece in real time, and test data can be transmitted and stored in a control system. The test bed 301 has the function of measuring the height of the pantograph by laser, avoids the space waste caused by the height gauge, integrates the function of measuring the weight of the pantograph, and is convenient to detect the pantograph weighing test item point.
The material storage area 102 is provided with a computer and a two-dimensional code printer for managing materials, and printed two-dimensional codes are used for material tracing. The storage platforms of the material storage area 102 are spliced by adopting aluminum alloy sections, and the bearing requirement of a single independent unit is more than or equal to 500 kg.
The working island 101 is disposed between the racking line 201 and the final assembly line 202. The operation island 101 is used for storing the sub-packaging assembly line 201, the parts required by the final assembly line 202 and the semi-finished products generated by the sub-packaging assembly line 201, and the workers can directly take the parts without going to the material storage area 102 to take the parts, so that the material taking time is shortened, and the production is more convenient and quicker. The operation island 101 deposit the platform and adopt the aluminium alloy concatenation mode, be convenient for disassemble and assemble, and do not interfere with station and frock.
As shown in fig. 1, the assembly line 202 includes six stations, which are, in sequence, an underframe assembly station 9, an air circuit assembly station 10, an arch raising assembly station 11, a lower arm assembly station 12, an upper frame assembly station 13, and a bow assembly station 14. The assembly station can complete one of the assembly procedures, the whole assembly procedure can be combined into a production line, and the assembly work efficiency is improved. Each final assembly station is provided with an all-in-one machine for material calling and process guidance, and the all-in-one machine is arranged on an all-in-one machine support 19 beside the final assembly station.
As shown in fig. 1, the bow assembly station 11 is adjacent to the test stand 301. After the head assembly station 11 finishes assembling the head, a complete pantograph can be produced on the station, the pantograph is transferred from the head assembly station 11 to the test area 3, and the requirements of routine test points of the pantograph are met, so that the test can be finished to determine whether the pantograph is a qualified product.
As shown in fig. 1, the sub-packaging assembly line 201 is provided with five stations corresponding to the assembly line 202, which are respectively a gas circuit sub-packaging station 4, a pantograph lifting sub-packaging station 5, a lower arm sub-packaging station 6, an upper frame sub-packaging station 7 and a pantograph head sub-packaging station 8, and each sub-packaging station can complete one sub-packaging process. As shown in fig. 1, the gas circuit subpackaging station 4 corresponds to the gas circuit assembling station 10, the arch lifting subpackaging station 5 corresponds to the arch lifting assembling station 11, the lower arm subpackaging station 6 corresponds to the lower arm assembling station 12, the upper frame subpackaging station 7 corresponds to the upper frame assembling station 13, and the bow head subpackaging station 8 corresponds to the bow head assembling station 14. Because the underframe does not need to be subpackaged, the underframe is directly delivered to the operation island beside the underframe general assembly station 9 without arranging an underframe subpackaging station, and the underframe can be taken for general assembly during general assembly.
In the sub-assembly line 201, the semi-finished products subjected to sub-assembly are placed on the working island 101, and can be directly used in the final assembly line 202. Every partial shipment station all disposes the computer that is used for material calling and technology to guide, and every partial shipment station is other to be equipped with a material and deposits the platform, can deposit the required material in the partial shipment work for the efficiency of partial shipment assembly line is higher.
The upper frame subpackaging station 7 comprises an upper frame press-fitting device, a pneumatic press-fitting mode is adopted, and the press-fitting machine is located on the side of an upper frame subpackaging platform and is operated manually. The upper frame is fixed manually by using the tool clamp, the shaft sleeve is placed into the pressure head tool, and the shaft sleeve is pressed automatically by manually starting the button.
As shown in fig. 1 and 2, the lower arm racking station 6 is provided with a pull rod press-fitting device and a lower arm press-fitting device, and the pull rod press-fitting device is operated manually in a pneumatic press-fitting manner. Underarm pole pressure equipment includes host computer, measurement and monitoring system and two parallel pressure equipment mechanisms 16, and the pressure equipment mode is automatic pressure equipment, two the both ends of pressure equipment mechanism 16 all are equipped with pressure head 15, pressure head 15 includes first pressure head 151 and second pressure head 152, can carry out the pressure equipment simultaneously to the both ends of armed lever under the pantograph, promote work efficiency, pressure equipment mechanism 16 itself is equipped with the slide rail, makes first pressure head 151 with distance between the second pressure head 152 is adjustable. A guide rail 17 is arranged between the two press-fitting mechanisms 16, so that the distance between the two press-fitting mechanisms 16 can be adjusted, and the pantograph assembly machine can be suitable for assembling pantographs of more models. The pressure head 15 is provided with a sensor, can acquire the pressure of pressure equipment of lower armed lever in real time, can acquire the pressure value in real time, treats that the work piece pressure equipment is finished, scans semi-manufactured goods's two-dimensional code and corresponds pressure value information and semi-manufactured goods, with pressure curve storage to control system, the later stage can be traceed back.
The lower arm press-fitting apparatus has two modes of a manual mode and a programmed automatic mode, and the press-fitting mechanism 16 is provided with a display screen for displaying the press-fitting assembly process.
As shown in fig. 1, the operating island 101 and the lower arm racking station 6, the upper frame racking station 7 and the area adjacent to the bow racking station 8 are respectively provided with an integrated machine support 19 for installing an integrated machine, and the integrated machine is used for material calling and process guidance.
The workbench of each sub-packaging station is provided with an installation interface compatible with parts of various types of pantographs, so that the pantograph type sub-packaging station is suitable for producing various types of pantographs. The frame of the workbench of the split charging station is spliced by aluminum alloy sections, and the bearing capacity is more than or equal to 200 kg. The workbench of the subpackaging station is fixed with the ground in a foundation bolt mode, the vertical plate is arranged on the rear side of the platform, a tool for subpackaging is arranged on the vertical plate, the plastic box is arranged below the vertical plate on the rear side and used for storing standard parts, and the work fixture for fixing workpieces is arranged on the subpackaging table, so that the assembly and the disassembly of parts are facilitated. The workbench is compatible with various pantograph part installation interfaces, and the installation mode is convenient, rapid and reliable.
As shown in fig. 1, the top of the assembly area 2 and the test area 3 is provided with a KBK (KombiniertKran) 18, the KBK18 is used for realizing station loading and unloading, the KBK18 comprises a crane rail, a suspension device, a travelling trolley electrical system and a lifting device, and all modules are standard components. The lifting device mainly adopts a ring chain electric device, a hanging gripper and a lifting hook, and the cross beam adopts an aluminum beam.
As shown in fig. 1, the material area 1 is provided with a second AGV for transferring material, and the travel route thereof is between the material storage area 102 and the working island 101. Use second AGV dolly 4 is with the material follow material storage area 102 is transported extremely operation island 101 makes things convenient for the staff to take the material, then accomplishes partial shipment work and generates semi-manufactured goods. Use the material that the second AGV dolly will not need the partial shipment is followed material district 1 is transported extremely operation island 101 makes things convenient for the staff directly to take to the final assembly line.
The final assembly line 202 is provided with six final assemblies and six first AGV carts. Through process circulation is realized to first AGV dolly and artifical two kinds of modes. After the operation of each station is completed, an operator reports completion through the all-in-one machine on the operation island 101, or sets the process operation time to forcibly flow according to the process time, the control system receives completion information and makes logical judgment between the upper process and the lower process, the transfer information is transferred to the first AGV trolley, and the first AGV trolley completes the flow of the final assembly workbench according to instructions. As shown in FIG. 1, each of the first AGV carts carries one of the assembly vehicles and is cycled between six assembly stations of the assembly line 202. The production beat is managed and controlled to accessible control first AGV dolly, and then realizes the beat circulation of final assembly line.
First AGV dolly with the second AGV dolly all is equipped with the camera, pastes the two-dimensional code that is used for navigation on its route of traveling. The camera reads two-dimension code information, obtains the position and the angle deviation of first AGV dolly or second AGV dolly, control system is in first AGV dolly or second AGV dolly moves the in-process of next two-dimension code and adjusts. And the first AGV trolley or the second AGV trolley performs actions of speed reduction, stopping, steering, material taking and placing and the like after reaching a target point. First AGV dolly with the second AGV dolly adopts mecanum wheel drive, and 4 wheat wheels pass through direct current servo motor and planetary reducer independent control respectively to link to each other with the automobile body through independent suspension mechanism. The moving functions of the first AGV trolley and the second AGV trolley, such as advancing, retreating, in-situ rotation around the centroid of the trolley body, lateral movement and the like can be realized by accurately controlling the rotating speed and the steering of the four wheat wheels.
The work flow of the subpackaging assembly line of the embodiment of the invention comprises the following steps:
the second AGV trolley delivers parts required by each sub-packaging station to the corresponding position of the operating island 101 through the material storage area 102. The second AGV returns to charging pile 20 to wait for the control system to dispatch. The staff is in the equipment of gas circuit during the partial shipment is accomplished to gas circuit partial shipment station 4, rises the equipment of bow in the partial shipment in rising bow partial shipment station 5 completion partial shipment, and the equipment of lower armed lever in the partial shipment is accomplished to lower armed lever partial shipment station 6, and the equipment of upper frame in the partial shipment is accomplished to upper frame partial shipment station 7, and the equipment of bow in the partial shipment is accomplished to bow partial shipment station 8. And the assembled air path, lift bow, lower boom, upper frame and bow are transferred to the working island 101.
The work flow of the final assembly line of an embodiment of the invention comprises the following steps:
the second AGV delivers parts that do not require to be distributed to the position corresponding to the working island 101 from the material storage area 102. The second AGV returns to charging pile 20 to wait for the control system to dispatch. The staff follows the part that each final assembly station needs is taken to operation island 101 carries out the final assembly work, first AGV dolly bears the final assembly is in the equipment of chassis in the final assembly station 9 completion final assembly, later traveles to the equipment of gas circuit in the final assembly of gas circuit final assembly station 10 completion gas circuit next traveles rise the equipment of bow in the bow final assembly station 11 completion final assembly, travel again to the equipment of upper arm pole in the lower arm pole final assembly station 12 completion final assembly, then travel to the equipment of frame in the upper frame final assembly station 13 completion final assembly, travel to bow final assembly station 14 and accomplish the equipment of bow in the final assembly, can accomplish the production of pantograph, then first AGV dolly continues to travel the next pantograph production is accomplished to chassis final assembly station 9.
When the production of the pantograph is finished, the worker takes the finished product out of the test bed 301 to test, and the routine test item requirement of the pantograph is finished, so that whether the pantograph is a qualified product can be determined.
Claims (10)
1. A pantograph assembly production line comprises a material area, an assembly area and a test area, and is characterized in that the material area comprises a material storage area and an operation island for storing accessories and semi-finished products, and the assembly area comprises a general assembly production line and a sub-assembly production line which are parallel to each other;
the assembly area is arranged between the material storage area and the test area;
the operation island is arranged between the final assembly production line and the sub-assembly production line;
the assembly line is provided with at least one assembly truck and at least one first AGV;
first AGV dolly bears the total loading is in the circulation on the total loading assembly line.
2. The pantograph assembly line of claim 1, wherein the assembly line comprises in sequence an underframe assembly station, an air circuit assembly station, an pantograph lifting assembly station, a lower arm assembly station, an upper frame assembly station and a pantograph head assembly station.
3. The pantograph assembly line of claim 2, wherein the pantograph assembly station is adjacent to the test area.
4. The pantograph assembly line of claim 2, wherein the sub-assembly line is provided with a gas circuit sub-assembly station, a pantograph lifting sub-assembly station, a lower arm sub-assembly station, an upper frame sub-assembly station and a pantograph head sub-assembly station in the order corresponding to the gas circuit sub-assembly station, the pantograph lifting sub-assembly station, the lower arm sub-assembly station, the upper frame sub-assembly station and the pantograph head sub-assembly station.
5. The pantograph assembly line of claim 4, wherein the work table of each racking station is provided with a mounting interface compatible with each type of pantograph parts.
6. The pantograph assembly line of claim 4, wherein the lower arm lever dispensing station is provided with a lower arm lever press-fitting device, the lower arm lever press-fitting device comprises two press-fitting mechanisms, and a guide rail is provided between the two press-fitting mechanisms.
7. The pantograph assembly line of claim 6, wherein the pressing mechanism is provided with a pressing head at both ends thereof, and the pressing head is provided with a pressure sensor.
8. The pantograph assembly line of any one of claims 1 to 7, wherein the assembly area and the test area are provided with hoisting equipment.
9. The pantograph assembly line of any one of claims 1 to 7, wherein the material area further comprises a second AGV trolley for transferring material; the running route is between the material storage area and the operation island.
10. The pantograph assembly line of claim 9, wherein the first AGV cart and the second AGV cart are provided with cameras, and two-dimensional codes for navigation are attached to the travel routes thereof.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110772996.8A CN113478219B (en) | 2021-07-08 | 2021-07-08 | Pantograph assembly line |
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| CN202110772996.8A CN113478219B (en) | 2021-07-08 | 2021-07-08 | Pantograph assembly line |
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| CN113478219A true CN113478219A (en) | 2021-10-08 |
| CN113478219B CN113478219B (en) | 2023-01-20 |
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| CN115816059A (en) * | 2022-11-28 | 2023-03-21 | 陕西法士特齿轮有限责任公司 | Double-station rear cover assembly production line and assembly method |
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| CN114559251A (en) * | 2022-03-09 | 2022-05-31 | 重庆工程职业技术学院 | Balance shaft dismounting module and pantograph dismounting assembly line thereof |
| CN115816059A (en) * | 2022-11-28 | 2023-03-21 | 陕西法士特齿轮有限责任公司 | Double-station rear cover assembly production line and assembly method |
| CN115816059B (en) * | 2022-11-28 | 2024-05-10 | 陕西法士特齿轮有限责任公司 | Double-station rear cover assembly production line and assembly method |
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| CN113478219B (en) | 2023-01-20 |
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