CN111037519A - Movable vibration exciter mounting machine - Google Patents
Movable vibration exciter mounting machine Download PDFInfo
- Publication number
- CN111037519A CN111037519A CN201911220259.6A CN201911220259A CN111037519A CN 111037519 A CN111037519 A CN 111037519A CN 201911220259 A CN201911220259 A CN 201911220259A CN 111037519 A CN111037519 A CN 111037519A
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- Prior art keywords
- vibration exciter
- exciter mounting
- mounting plate
- lifting
- vibration
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- 238000003466 welding Methods 0.000 claims abstract description 20
- 230000005284 excitation Effects 0.000 abstract description 12
- 238000012360 testing method Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
- B25H1/00—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby
- B25H1/06—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby of trestle type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
- B25H1/00—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby
- B25H1/14—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby with provision for adjusting the bench top
- B25H1/16—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby with provision for adjusting the bench top in height
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
- B25H5/00—Tool, instrument or work supports or storage means used in association with vehicles; Workers' supports, e.g. mechanics' creepers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
A movable vibration exciter mounting machine comprises a walking frame, a lifting frame arranged on the walking frame and a vibration exciter mounting workbench arranged on the lifting frame, wherein the vibration exciter mounting workbench comprises a vibration exciter mounting bracket, the vibration exciter mounting bracket is formed by welding two pairs of horizontal and parallel cross beams, a vibration exciter mounting plate is connected to one side cross beam through a hinge, a rotary turntable can control the vibration exciter mounting plate to rotate along the hinge within the range of 0-180 degrees through linkage of a lead screw-lead screw moving block-connecting rod, a vibration exciter is arranged on the outer surface of the vibration exciter mounting plate, when the included angle between the bracket and the mounting plate is 0 degree, the inner surface of the vibration exciter mounting plate is attached to the upper surface of the cross beam, the vibration exciting direction of the vibration exciter is upward, when the included angle is 180 degrees, the inner surface of the vibration exciter mounting plate, the excitation direction is downward. The invention has the characteristics of convenient movement, easy control of lifting, capability of quickly realizing the switching of the upward and downward excitation modes of the vibration exciter and the like.
Description
Technical Field
The invention belongs to the technical field of modal analysis, and particularly relates to a movable vibration exciter mounting machine.
Background
In the following mechanical dynamics research, modal analysis is a very common method, the vibration exciter is an important excitation instrument in modal test, and the vibration exciter is a device which is attached to some machines and equipment to generate excitation force and can enable the excited object to obtain a certain form and magnitude of vibration, so as to perform vibration and strength test on the object, or calibrate a vibration test instrument and a sensor.
Need install the location to the vibration exciter in the experiment, the vibration exciter mainly has two kinds of mode, upwards excitation and downward excitation mode, when upwards exciting, need fix the vibration exciter on the plane, need hoist and mount the vibration exciter or hang during the downward excitation, many laboratories all adopt the mode of direct mount at present, some laboratory designs have the mounting bracket, but most heavy and inconvenient removal, or the stroke is short, bearing capacity is limited, the experiment precision is low, so urgently need a simple structure, be convenient for remove, adjust the precision height, the good movable vibration exciter installation mechanical scheme of rigidity.
Disclosure of Invention
In order to overcome the disadvantages of the prior art, the present invention provides a mobile vibration exciter mounting machine, which has two forms, a working form and a mobile form; meanwhile, when the device is in a working state, the angle of the vibration exciter mounting plate is adjusted through the rotary turntable, so that the vibration exciter can excite vibration in any direction, and the device is simple in structure, convenient to operate, safe and stable.
In order to achieve the purpose, the invention adopts the technical scheme that:
a movable vibration exciter mounting machine comprises a walking frame 2, a lifting frame 1 arranged on the walking frame 2 and a vibration exciter mounting workbench 3 arranged on the lifting frame 1, wherein the vibration exciter mounting workbench 3 comprises a vibration exciter mounting bracket 33, the vibration exciter mounting bracket 33 is formed by welding two pairs of horizontal and parallel cross beams, a vibration exciter mounting plate 312 is connected to one of the cross beams through a hinge 310, the vibration exciter mounting plate 312 can rotate around the hinge 310 within the range of 0-180 degrees, a vibration exciter is mounted on the outer surface of the vibration exciter mounting plate 312, when the included angle between the vibration exciter mounting bracket 33 and the vibration exciter mounting plate 312 is 0 degree, the inner surface of the vibration exciter mounting plate 312 is attached to the upper surface of the cross beam, the vibration exciting direction of the vibration exciter is upward, when the included angle is 180 degrees, the inner surface of the vibration exciter mounting plate 312 faces upward and is positioned on the same, the excitation direction is downward.
The exciter mounting plate 312 controls the angle between the exciter mounting bracket 33 and the exciter through a lead screw slider mechanism.
The screw slide block mechanism comprises an adjusting screw 37 provided with a screw slide block connecting shaft, one end part of the adjusting screw 37 is connected with a turntable shaft 31 provided with a turntable 32 through a bevel gear set, two ends of the screw slide block connecting shaft are respectively provided with an adjusting screw moving block 39, the inner surface of the vibration exciter mounting plate 312 is provided with two slide rails perpendicular to the rotating shaft of the hinge 310, one end of each of the two connecting rods 311 is positioned in one slide rail through a slide block, the other ends of the two connecting rods 311 are respectively connected with an adjusting lead screw moving block 39, the rotating of the rotating disk 32 drives the rotating disk shaft 31 to rotate, and the bevel gear set drives the adjusting screw 37 to rotate, so that the adjusting screw moving block 39 is pushed to move linearly, the adjusting screw moving block 39-the connecting rod 311-the vibration exciter mounting plate 312 are linked, and the angle between the vibration exciter mounting plate 312 and the vibration exciter mounting bracket 33 is controlled.
The walking frame 2 comprises a welding underframe 23 with a moving handle 21 and a moving wheel 24, the welding underframe 23 is rectangular, the four corners of the welding underframe 23 are respectively provided with a vertical threaded hole, and each threaded hole is internally provided with a vertical spiral fixed support 22.
Two horizontal upper guide rails 36 are fixed below the vibration exciter mounting bracket 33, an upper limiting block 38 is installed at one end of each guide rail, two horizontal lower guide rails 36 are fixed above the welding underframe 23, a lower limiting block 38 is installed at one end of each guide rail, the lifting frame 1 adopts a scissor-type lifting mechanism and comprises a lifting rod 13, the lifting rod 13 is provided with a plurality of lifting rods which are mutually connected through a lifting rod fixing shaft 12 to form a linked whole, the upper end and the lower end of the rear part of the lifting rod are fixed with the vibration exciter mounting seat 3 and the walking frame 2 through rotating pairs, and the upper end and the lower end of the front part of the lifting rod are fixed with the vibration exciter mounting seat 3 and the walking frame 2 through the moving pairs on the guide rails.
The upper end and the lower end of the rear part of the linkage whole are respectively fixedly connected with an upper guide rail 36 and a lower guide rail 26 through a lifting support 11, the upper end and the lower end of the front part move in the upper guide rail 36 and the lower guide rail 26 through rollers 19, a lifting rod moving shaft 14 in the lifting mechanism is provided with a lead screw moving support 18, one end of a lead screw 17 perpendicular to the lifting rod moving shaft 14 is connected with the lead screw moving support 18, the other end of the lead screw is provided with a lead screw handle 16 and is connected with a lead screw support 15, and the lifting control of the scissor type lifting mechanism is realized through the forward and.
Compared with the prior art, the invention can be used in the occasions needing the vibration exciters to excite in different directions, when the device is in a moving state, the upper mechanical structure is in a contraction state, the size of the whole luggage case is close to that of one luggage case, and at the moment, the four rotating wheels touch the ground and can be directly driven to move freely by the pushing device; when the device is in a working state, the four support legs are rotated to enable the support legs to land on the ground, the whole mass is borne by the support legs, meanwhile, the height of the support legs can be adjusted to adapt to uneven ground, and then the lead screw is rotated to adjust the height of the installation position to accurately position the vibration exciter. In addition, the device can adjust the angle of the vibration exciter mounting plate through the rotary turntable, so that the vibration exciter can excite vibration in any direction, particularly two working modes at 0-degree and 180-degree, wherein the mounting plate is stacked on the rack, and the vibration exciting direction of the vibration exciter is upward at the moment, so that the lower surface of a workpiece can be excited; the mounting plate can be overturned, the vibration exciter is hung on the mounting plate at the moment, the vibration exciting direction is downward, the upper surface of a workpiece can be excited, and different working condition requirements are met. The invention has the characteristics of convenient movement, easy control of lifting, capability of quickly realizing the switching of the upward and downward excitation modes of the vibration exciter and the like.
Drawings
FIG. 1 is a schematic view of the working mode of the present invention.
FIG. 2 is a schematic diagram of the moving mode of the present invention.
Fig. 3 is a schematic structural view of the bottom walking frame of the present invention.
Fig. 4 is a schematic structural diagram of the vibration exciter mounting seat of the invention.
Fig. 5 is a schematic view of the hoisting frame structure of the present invention.
In the figure 1, a lifting frame; 2, a walking frame; 3, a vibration exciter mounting seat; 11 lifting the support; 12 lifting rod fixing shafts; 13 lifting the rod; 14 a lift pin moving shaft; 15 lead screw support; 16 lead screw handles; 17, a screw rod; 18 screw rod moving support; 19 a roller; 21 moving the handle; 22 a spiral fixed support; 23 welding the underframe; 24 a moving wheel; a 25 lower limit block; 26 a lower guide rail; 31 a turntable shaft; 32 a turntable; 33, a vibration exciter mounting bracket; 34 a drive gear; 35 a driven gear; 36 an upper guide rail; 37 adjusting the lead screw; 38 an upper limiting block; 39 adjusting a lead screw moving block; 310, a hinge; 311 connecting rods; 312 exciter mounting plate.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
As shown in fig. 1 and 2, a mobile vibration exciter mounting machine includes a traveling frame 2, a lifting frame 1 mounted on the traveling frame 2, and a vibration exciter mounting base 3 mounted on the lifting frame 1.
As shown in fig. 3, the lifting frame 1 adopts a scissor-type lifting mechanism, and includes a plurality of lifting rods 13, the lifting rods 13 are connected with each other by lifting rod fixing shafts 12 to form a linked whole, the upper and lower ends of the rear portion of the lifting rod are fixed to the vibration exciter mounting base 3 and the walking frame 2 by rotating pairs, and the upper and lower ends of the front portion of the lifting rod are fixed to the vibration exciter mounting base 3 and the walking frame 2 by moving pairs on guide rails.
Specifically, the upper end and the lower end of the rear part of the linkage whole are respectively fixedly connected with an upper guide rail 36 and a lower guide rail 26 through a lifting support 11, the upper end and the lower end of the front part move in the upper guide rail 36 and the lower guide rail 26 through rollers 19, a lifting rod moving shaft 14 in a lifting mechanism is provided with a screw rod moving support 18, one end of a screw rod 17 perpendicular to the lifting rod moving shaft 14 is connected with the screw rod moving support 18, the other end of the screw rod 17 is provided with a screw rod handle 16 and is connected with the screw rod support 15, the screw rod 17 is driven to rotate through the forward and reverse rotation of the screw rod handle 16, so that the front part of a lifting rod 13 is pushed to move, the height of the device is changed. By means of the self-locking characteristic of the screw rod structure, the device can keep the height unchanged so as to achieve the effect of stable excitation.
As shown in fig. 4, the walking frame 2 includes a welding chassis 23 having a moving handle 21 and a moving wheel 24, the welding chassis 23 is rectangular and is formed by welding a set of square steel pipes and steel plates, and lower guide rails 26 are welded to two symmetrical sides of the welding chassis 23 and have lower limit blocks 25. The welding underframe 23 is provided with a vertical threaded hole at each of four corners, a vertical spiral fixed support 22 is arranged in each threaded hole, and the welding underframe 23 is in threaded fit with the spiral fixed support 22 to rotate the whole position of the device fixed by the spiral fixed support 22 and serve as a bearing part of the device.
The moving mode is realized by the following steps: the moving function is realized by a moving handle 21, a spiral fixed support 22, a welding chassis 23 and a moving wheel 23. When the device needs to be moved, the lifting frame 1 and the vibration exciter mounting seat 3 on the device are retracted and put down to the position of the limiting block 25, the underframe extension rod is retracted, the spiral fixing support 22 is rotated to be separated from the ground, and finally the moving handle 21 is pushed to the storage position.
As shown in fig. 5, the exciter mounting table 3 includes an exciter mounting bracket 33, the exciter mounting bracket 33 is formed by welding two pairs of horizontal and parallel cross beams, an exciter mounting plate 312 is connected to one of the cross beams through a hinge 310, two upper guide rails 36 are provided, and are horizontally and parallel and fixed below the exciter mounting bracket 33, and an upper limit block 38 is mounted at one end of the upper guide rail 36.
The vibration exciter mounting plate 312 can rotate around the hinge 310 within the range of 0-180 degrees, the vibration exciter is mounted on the outer surface of the vibration exciter mounting plate 312, when the included angle between the vibration exciter mounting bracket 33 and the vibration exciter mounting plate 312 is 0 degree, the inner surface of the vibration exciter mounting plate 312 is attached to the upper surface of the cross beam, the vibration exciting direction of the vibration exciter is upward, when the included angle is 180 degrees, the inner surface of the vibration exciter mounting plate 312 faces upward and is located on the same horizontal plane with the upper surface of the cross beam, the vibration exciter is hung on the vibration exciter mounting plate.
In the embodiment of the present invention, the exciter mounting plate 312 is controlled in angle to the exciter mounting bracket 33 by a lead screw slider mechanism.
The invention provides a concrete structure of a lead screw slider mechanism, which comprises an adjusting lead screw 37 provided with a lead screw slider connecting shaft and a turntable shaft 31 provided with a turntable 32, wherein a driving gear 34 is arranged on the turntable shaft 31, a driven gear 35 is arranged at one end of the adjusting lead screw 37, the driving gear 34 and the driven gear 35 form a meshed bevel gear set, adjusting lead screw moving blocks 39 are respectively arranged at two ends of the lead screw slider connecting shaft, two sliding rails vertical to a rotating shaft of a hinge 310 are arranged on the inner surface of a vibration exciter mounting plate 312, one ends of two connecting rods 311 are respectively positioned in one sliding rail through sliding blocks, and the other ends of the two connecting rods 311 are respectively connected with one adjusting lead screw moving block 39.
The realization process of the invention is as follows:
1. installing a vibration exciter: the bottom of the vibration exciter is connected with the vibration exciter mounting seat 3 through bolts, and particularly, the bottom of the vibration exciter is mounted on the outer surface of the vibration exciter mounting plate 312.
2. The whole machine is moved to a designated position and fixed: pushing the moving handle 21 moves the device to a designated position, rotating the screw fixing support 22 to contact the ground and take up the whole mass.
3. Adjusting the vibration exciter to perform upward vibration excitation: and rotating a screw rod handle 16 to rotate a screw rod 17, pushing a screw rod moving support 18 to move along the guide rail, so as to drive a shear fork of the lifting rod 13 to move, and lifting the vibration exciter mounting base 3 until the vibration exciter mounting base reaches a preset working height.
4. Adjusting the excitation direction of a vibration exciter: in a default state, the vibration exciter mounting plate 312 is superposed with the vibration exciter mounting bracket 33, the rotation angle of the vibration exciter mounting plate 312 is 0 degree, the vibration exciter mounting surface faces upwards, and the vibration exciter excites upwards; the rotating disc 32 is rotated, the bevel gear set drives the adjusting screw rod 37 to rotate, the adjusting screw rod moving block 39 is pushed to move linearly, the adjusting screw rod moving block 39-the connecting rod 311-the vibration exciter mounting plate 312 are linked, the vibration exciter mounting plate 312 rotates 180 degrees around the hinge 310, at the moment, the vibration exciter mounting surface faces downwards, and the vibration exciter excites downwards.
5. A retraction device: after the test is finished, firstly finely adjusting the height of the vibration exciter, taking down the experimental material, then retracting and putting down the part lifting frame 1 and the vibration exciter mounting seat 3 on the device to the position of the limiting block, withdrawing the extension rod of the bottom frame, rotating the spiral fixed support 22 to separate the spiral fixed support from the ground, and finally pushing the movable handle 21 to the storage position.
Claims (6)
1. A movable vibration exciter mounting machine comprises a walking frame (2), a lifting frame (1) arranged on the walking frame (2) and a vibration exciter mounting workbench (3) arranged on the lifting frame (1), and is characterized in that the vibration exciter mounting workbench (3) comprises a vibration exciter mounting support (33), the vibration exciter mounting support (33) is formed by welding two pairs of horizontal and parallel cross beams, a vibration exciter mounting plate (312) is connected to one of the cross beams through a hinge (310), the vibration exciter mounting plate (312) can rotate around the hinge (310) within the range of 0-180 degrees, the vibration exciter is mounted on the outer surface of the vibration exciter mounting plate (312), when the included angle between the vibration exciter mounting support (33) and the vibration exciter mounting plate (312) is 0 degree, the inner surface of the vibration exciter mounting plate (312) is attached to the upper surface of the cross beam, and the vibration exciting direction of the vibration exciter is, when the angle is 180 degrees, the inner surface of the vibration exciter mounting plate (312) faces upwards and is positioned on the same horizontal plane with the upper surface of the cross beam, the vibration exciter is hung on the vibration exciter mounting plate (312), and the vibration exciting direction is downward.
2. The mobile exciter mounting machine according to claim 1, wherein the exciter mounting plate (312) is controlled in angle to the exciter mounting bracket (33) by a lead screw slider mechanism.
3. The mobile vibration exciter mounting machine according to claim 1, wherein the screw slider mechanism comprises an adjusting screw (37) having a screw slider connecting shaft, one end of the adjusting screw (37) is connected to a turntable shaft (31) having a turntable (32) through a bevel gear set, two ends of the screw slider connecting shaft are respectively provided with an adjusting screw moving block (39), the inner surface of the vibration exciter mounting plate (312) is provided with two slide rails perpendicular to the rotating shaft of the hinge (310), one end of each of the two connecting rods (311) is respectively located in one slide rail through a slider, the other end of each of the two connecting rods (311) is respectively connected to an adjusting screw moving block (39), the rotation of the turntable (32) drives the turntable shaft (31) to rotate, and further drives the adjusting screw (37) to rotate through the bevel gear set, so as to push the adjusting screw moving block (39) to move linearly, the adjusting lead screw moving block (39) -connecting rod (311) -vibration exciter mounting plate (312) are linked, so that the angle between the vibration exciter mounting plate (312) and the vibration exciter mounting bracket (33) is controlled.
4. The mobile vibration exciter mounting machine according to claim 1, characterized in that the travelling frame (2) comprises a welding chassis (23) with a moving handle (21) and a moving wheel (24), the welding chassis (23) is rectangular, and the four corners of the welding chassis are respectively provided with a vertical threaded hole, and a vertical screw fixing support (22) is arranged in each threaded hole.
5. The mobile vibration exciter mounting machine according to claim 4, wherein two horizontal upper guide rails (36) are fixed below the vibration exciter mounting bracket (33), an upper limiting block (38) is mounted at one end of each upper guide rail, two horizontal lower guide rails (36) are fixed above the welding underframe (23), a lower limiting block (38) is mounted at one end of each lower guide rail, the lifting frame (1) adopts a scissor-fork type lifting mechanism and comprises a lifting rod (13), a plurality of lifting rods (13) are connected with each other through a lifting rod fixing shaft (12) to form a linked whole, the upper and lower ends of the rear part of the lifting frame are fixed with the vibration exciter mounting seat (3) and the walking frame (2) through rotating pairs, and the upper and lower ends of the front part of the lifting frame are fixed with the vibration exciter mounting seat (3) and the walking frame (2) through moving pairs on the guide rails.
6. The mobile vibration exciter mounting machine according to claim 5, wherein the upper and lower ends of the rear part of the linkage unit are respectively and fixedly connected with the upper guide rail (36) and the lower guide rail (26) through the lifting support (11), the upper and lower ends of the front part of the linkage unit move in the upper guide rail (36) and the lower guide rail (26) through the rollers (19), a lifting rod moving shaft (14) of the lifting mechanism is provided with a lead screw moving support (18), one end of a lead screw (17) perpendicular to the lifting rod moving shaft (14) is connected with the lead screw moving support (18), the other end of the lead screw is provided with a lead screw handle (16) and is connected with the lead screw support (15), and the lifting control of the scissor type lifting mechanism is realized through the forward and reverse rotation of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911220259.6A CN111037519A (en) | 2019-12-03 | 2019-12-03 | Movable vibration exciter mounting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911220259.6A CN111037519A (en) | 2019-12-03 | 2019-12-03 | Movable vibration exciter mounting machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111037519A true CN111037519A (en) | 2020-04-21 |
Family
ID=70233389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911220259.6A Pending CN111037519A (en) | 2019-12-03 | 2019-12-03 | Movable vibration exciter mounting machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111037519A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112405454A (en) * | 2020-10-22 | 2021-02-26 | 东风汽车股份有限公司 | Mechanical type area helping hand goes up and down to install and assists utensil |
| CN114030842A (en) * | 2021-11-19 | 2022-02-11 | 中国直升机设计研究所 | Excitation platform positioning and moving device |
| CN114683040A (en) * | 2022-06-01 | 2022-07-01 | 南通迪欧安普光电科技有限公司 | Assembling equipment for laser transmitter of level meter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN114683040A (en) * | 2022-06-01 | 2022-07-01 | 南通迪欧安普光电科技有限公司 | Assembling equipment for laser transmitter of level meter |
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Application publication date: 20200421 |