CN120572495A - A variable distance module slide - Google Patents
A variable distance module slideInfo
- Publication number
- CN120572495A CN120572495A CN202511029752.5A CN202511029752A CN120572495A CN 120572495 A CN120572495 A CN 120572495A CN 202511029752 A CN202511029752 A CN 202511029752A CN 120572495 A CN120572495 A CN 120572495A
- Authority
- CN
- China
- Prior art keywords
- fixedly connected
- fixed frame
- slide
- rotatably connected
- wheel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
The invention relates to the technical field of module slipways, in particular to a variable-pitch module slipway, which comprises a formwork, wherein a variable-pitch mechanism is fixedly connected to the formwork, a slipway is arranged on the formwork in a sliding fit manner, one end of the formwork is fixedly connected to a fixed frame, a protection plate is rotatably connected to the upper part of the fixed frame, an adjusting mechanism is rotatably connected to the bottom end of the fixed frame, one end of the adjusting mechanism is rotatably connected to the fixed frame, a jet seat is fixedly connected to one side of the fixed frame, a transmission mechanism is rotatably connected to one side of the jet seat, and the adjusting mechanism can be automatically driven when the slipway is retracted to one side after the slipway is used, so that the adjusting mechanism drives the slipway surface maintenance plate to move to process metal scraps on the slipway, and the automatic and intelligent level of the production process is greatly improved by reducing manual intervention, improving the working efficiency, prolonging the service life of equipment and the like, and the clean and safe production environment is ensured.
Description
Technical Field
The invention relates to the technical field of module sliding tables, in particular to a variable-pitch module sliding table.
Background
The variable-pitch module sliding table is a mechanical device capable of adjusting the stroke of the sliding table and is generally applied to the fields of automatic production, precision machining, assembly, testing and the like. Compared with the traditional fixed stroke sliding table, the stroke of the variable-pitch module sliding table can be adjusted according to actual requirements, so that higher flexibility and adaptability are provided, and the variable-pitch module sliding table is particularly suitable for the requirements of various different workpieces or tasks. In the body manufacturing process of electric vehicles, a slipway system may be used to move and position body parts. Through the variable-distance sliding table, the system can flexibly adjust the positions of the vehicle body parts, and accurate assembly is ensured. For example, on an automatic electric automobile body welding or assembly line, the slipway can adjust the distance according to the needs so as to adapt to different automobile types and technological requirements.
The prior art publication No. CN116241622A provides a variable pitch module slip table, after motor drive slip table, compress flexible post when two slide are contradicted to flexible post one end in the embedded track, flexible post compression inside reset spring, the inlet port at flexible post top links up and communicates with the through-hole of first oil storage chamber bottom this moment, thereby the inside oil feed intracavity of flexible post is followed to the inlet port to the inside lubricating oil of first oil storage intracavity, and then lubricating oil is got into the embedded track through the oil feed intracavity, and then play lubrication effect to the embedded track, when motor stop work, inlet port and through-hole are the dislocation separately, when the motor work, when the slide is contradicted to flexible post, inlet port and through-hole link up the intercommunication and supply oil, the purpose of self-lubricating has been reached.
In the prior art, during the manufacturing process of electric automobiles, particularly during metal cutting and grinding operations, generated metal scraps and dust are easy to adhere to the surface of a sliding table. In the use process of the prior art, the surface of the sliding table is not convenient to automatically treat in time, so that the metal scraps and dust can influence the precision and the movement performance of the sliding table, friction increase and component abrasion can be possibly caused, and even the surface of the sliding table is damaged.
In summary, in the prior art, a technology for automatically processing and maintaining metal scraps on the surface of the sliding table is lacking.
Disclosure of Invention
The invention aims to solve the defects in the background technology and provides a variable-distance module sliding table.
In order to achieve the purpose, the technical scheme includes that the variable-distance module sliding table comprises a die frame, a variable-distance mechanism is fixedly connected to the die frame, the die frame is provided with the sliding table in a sliding fit mode, one end of the die frame is fixedly connected with a fixing frame, a protection plate is rotatably connected above the fixing frame, the bottom end of the fixing frame is rotatably connected with an adjusting mechanism, one end of the adjusting mechanism is rotatably connected with a sliding table surface maintenance plate, one side of the fixing frame is fixedly connected with an air injection seat, and one side of the air injection seat is rotatably connected with a transmission mechanism.
Preferably, the distance-changing mechanism comprises a driving belt, belt wheels are arranged at two ends of the driving belt in a friction transmission manner, one end of the driving belt is fixedly connected with the sliding table, the belt wheels are rotatably connected with the die carrier, one end of the belt wheels is fixedly connected with a motor, and the motor is fixedly connected with the die carrier.
Preferably, the equal fixed connection in guard plate both ends is provided with the upset gear, upset gear one side meshing transmission is provided with adjusts the rack, it runs through sliding fit setting with the mount to adjust the rack, it is provided with trapezoidal trigger piece to adjust rack bottom fixed connection, trapezoidal trigger piece and slip table surface retainer board sliding contact setting, fixed connection fixedly is provided with the spring on adjusting the rack bottom, the spring other end sets up with mount fixed connection.
Preferably, the adjusting mechanism comprises a universal joint A, the universal joint A is connected with the fixing frame in a penetrating and rotating mode, a driving wheel is fixedly connected with one end of the universal joint A, a driving rack is arranged on one side of the driving wheel in a meshed and driving mode, and the driving rack is fixedly connected with the sliding table.
Preferably, the universal joint A other end fixed connection is provided with the worm, the equal meshing transmission in worm both sides is provided with the worm wheel, the worm wheel rotates with the mount to be connected and sets up, fixed connection is provided with the push rod group on the worm wheel, the push rod group other end rotates with slip table surface maintenance board and is connected and sets up.
Preferably, fixed surface connection is provided with the rubber strip under the slip table surface maintenance board, rubber strip and slip table surface sliding contact set up, slip table surface maintenance board top fixed connection is provided with the jet pipe, jet pipe one end fixed connection is provided with flexible pipe, flexible pipe runs through fixed connection setting with the mount, slip table surface maintenance board one side rotates the connection and is provided with the brush pole, brush pole one end fixed connection is provided with the wind spring, the wind spring other end sets up with slip table surface maintenance board fixed connection, the wind lever other end is convoluteed there is the stay cord, the stay cord other end passes slip table surface maintenance board inner wall and extends to outside and set up with mount fixed connection.
Preferably, the jet-propelled seat output and flexible pipe one end fixed connection set up, the sliding fit is provided with the bleed plate in the jet-propelled seat, bleed plate one side fixed connection is provided with the extension spring, the extension spring other end and jet-propelled seat inner wall fixed connection set up, bleed plate opposite side fixed connection is provided with the gyro wheel pole, the gyro wheel pole runs through sliding fit with jet-propelled seat inner wall and sets up.
Preferably, the transmission mechanism comprises an electric push rod, the electric push rod is rotationally connected with the air injection seat, a rubber wheel is fixedly connected with the output end of the electric push rod, the rubber wheel is in friction contact with the outer wall of the belt wheel, and a driving wheel is fixedly connected with one end of the electric push rod.
Preferably, the driving wheel is provided with a driven wheel in a meshed transmission manner on one side of the driving wheel, the driven wheel is rotatably connected with the air injection seat, one end of the driven wheel is fixedly connected with a concave-convex disc, and the outer wall of the concave-convex disc is in sliding contact with a roller on the roller rod.
Compared with the prior art, the invention has the following beneficial effects:
By arranging the sliding table surface maintenance plate, the adjusting mechanism can be automatically driven when the sliding table is retracted to one side after being used, so that the adjusting mechanism drives the sliding table surface maintenance plate to move to process metal scraps on the sliding table surface, the automation and intelligence level of the production process can be greatly improved, and the cleanness and safety of the production environment are ensured by reducing manual intervention, improving the working efficiency, prolonging the service life of equipment, maintaining the precision of the equipment and the like;
By arranging the transmission mechanism and the air injection seat, the transmission mechanism can be driven when the variable-pitch mechanism drives the sliding table to retract, so that the transmission mechanism drives the air injection seat to inject air into the air injection pipe on the sliding table surface maintenance plate, metal scraps accumulated on the surface of the sliding table can be rapidly removed, the surface of the sliding table can be effectively cleaned by the high speed of air injection, impurities are prevented from staying on the sliding table for a long time, the cleanliness of the surface is ensured, the operation precision and the stability of the sliding table are improved, the equipment fault risk is reduced, and the overall production efficiency and the intelligent level of equipment are improved;
Through setting up the guard plate, can make the guard plate automatic upset keep off in the slip table top when the slip table is retrieved to one side, form effectual barrier, avoided operating personnel or other objects and slip table surface contact, reduced the risk of unexpected injury, especially when the slip table is retrieved, the guard plate provides extra protection, prevent any external interference, can further improve security, stability and the durability of equipment, reduce external pollution and wearing and tearing, promote the automation level of equipment, ensure that equipment operates for a long time high-efficient, safely.
Drawings
FIG. 1 is a schematic diagram of one side of the whole structure of a sliding table of a variable-pitch module according to the present invention;
FIG. 2 is a schematic diagram of the other side of the whole structure of the sliding table of the variable-pitch module according to the present invention;
FIG. 3 is a schematic diagram of a structure of a variable-pitch mechanism of a sliding table of a variable-pitch module according to the present invention;
FIG. 4 is a schematic view of a structure of a protection plate of a sliding table of a variable-pitch module according to the present invention;
FIG. 5 is a schematic diagram of a mechanism for adjusting a sliding table of a variable-pitch module according to the present invention;
FIG. 6 is a schematic view showing a partial cross section of a structure of a retaining plate on a surface of a sliding table of a variable-pitch module sliding table;
FIG. 7 is a schematic view of a part of a jet seat of a sliding table of a variable-pitch module according to the present invention;
Fig. 8 is a schematic diagram of a transmission mechanism structure of a sliding table of a variable-pitch module according to the present invention.
The drawing shows that the device comprises a frame 1, a mould frame 2, a distance changing mechanism 3, a sliding table 4, a fixing frame 5, a protection plate 6, an adjusting mechanism 7, a sliding table surface maintenance plate 8, a jet seat 9, a transmission mechanism 201, a transmission belt 202, a belt pulley 203, a motor 501, a turnover gear 502, an adjusting rack 503, a trapezoid trigger block 504, a spring 601, a universal joint A602, a transmission wheel 603, a transmission rack 604, a worm 605, a worm wheel 606, a push rod group 701, a jet pipe 702, a telescopic pipe 703, a brush rod 704, a coil spring 705, a pull rope 801, a suction plate 802, a tension spring 803, a roller rod 901, an electric push rod 902, a rubber wheel 903, a driving wheel 904, a driven wheel 905 and a concave-convex disc.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art.
The utility model provides a but range module slip table as shown in fig. 1-8, including die carrier 1, fixed connection is provided with range mechanism 2 on the die carrier 1, sliding fit is provided with slip table 3 on the die carrier 1, die carrier 1 one end fixed connection is provided with mount 4, mount 4 top swivelling joint is provided with guard plate 5, mount 4 bottom swivelling joint is provided with adjustment mechanism 6, adjustment mechanism 6 one end swivelling joint is provided with slip table surface maintenance board 7, mount 4 one side fixed connection is provided with jet-propelled seat 8, jet-propelled seat 8 one side swivelling joint is provided with drive mechanism 9.
As shown in fig. 3, the distance-changing mechanism 2 includes a driving belt 201, two ends of the driving belt 201 are provided with belt wheels 202 in friction transmission, one end of the driving belt 201 is fixedly connected with the sliding table 3, the belt wheels 202 are rotatably connected with the die carrier 1, one end of one belt wheel 202 is fixedly connected with a motor 203, and the motor 203 is fixedly connected with the die carrier 1.
As shown in fig. 4, the two ends of the protection plate 5 are fixedly connected with turnover gears 501, one side of each turnover gear 501 is provided with an adjusting rack 502 in a meshed transmission manner, each adjusting rack 502 and the fixing frame 4 are arranged in a penetrating sliding fit manner, the bottom end of each adjusting rack 502 is fixedly connected with a trapezoidal triggering block 503, the trapezoidal triggering blocks 503 are arranged in sliding contact with the surface maintenance plates 7 of the sliding table, springs 504 are fixedly connected to the bottom ends of the adjusting racks 502, and the other ends of the springs 504 are fixedly connected with the fixing frame 4. When the sliding table surface maintenance plate 7 moves away, the trapezoid trigger block 503 contacted with the sliding table surface maintenance plate is not limited, and at the moment, under the action of the spring 504, the connected adjusting rack 502 is driven to move, so that the adjusting rack 502 can drive the protection plate 5 connected with the turning gear 501 to turn.
As shown in fig. 5, the adjusting mechanism 6 includes a universal joint a601, the universal joint a601 is rotatably connected with the fixing frame 4, a driving wheel 602 is fixedly connected with one end of the universal joint a601, a driving rack 603 is arranged on one side of the driving wheel 602 in a meshed transmission manner, and the driving rack 603 is fixedly connected with the sliding table 3.
The other end of the universal joint A601 is fixedly connected with a worm 604, worm gears 605 are arranged on two sides of the worm 604 in a meshed transmission mode, the worm gears 605 are rotatably connected with the fixing frame 4, a push rod group 606 is fixedly connected to the worm gears 605, and the other end of the push rod group 606 is rotatably connected with the sliding table surface maintenance plate 7. When the transmission rack 603 on the sliding table 3 is meshed with the transmission wheel 602, the worm 604 connected with the universal joint A601 can be driven to rotate, the worm 604 can drive the push rod group 606 connected with the worm wheel 605 to rotate, and the push rod group 606 can drive the sliding table surface maintenance plate 7 to move.
As shown in fig. 6, a rubber strip is fixedly connected to the lower surface of the sliding table surface maintenance plate 7, the rubber strip is in sliding contact with the surface of the sliding table 3, an air ejector tube 701 is fixedly connected to the top end of the sliding table surface maintenance plate 7, one end of the air ejector tube 701 is fixedly connected with a telescopic tube 702, the telescopic tube 702 is fixedly connected with the fixing frame 4 in a penetrating manner, a brush rod 703 is rotatably connected to one side of the sliding table surface maintenance plate 7, a coil spring 704 is fixedly connected to one end of the brush rod 703, the other end of the coil spring 704 is fixedly connected with the sliding table surface maintenance plate 7, a pull rope 705 is wound at the other end of the brush rod 703, and the other end of the pull rope 705 extends to the outside through the inner wall of the sliding table surface maintenance plate 7 and is fixedly connected with the fixing frame 4. The coil spring 704 can drive the brush rod 703 to automatically turn over and drive the pull rope 705 to wind up.
Through setting up slip table surface maintenance board 7, when slip table 3 finishes using and withdraws it to one side, can drive adjustment mechanism 6 voluntarily for adjustment mechanism 6 drives slip table 3 surface maintenance board and removes the metal fillings of handling slip table 3 surface, can promote the automation, the intelligent level of production process by a wide margin through modes such as reducing manual intervention, improving work efficiency, extension equipment life, maintaining equipment precision, and guarantee the clean and tidy and safe of production environment.
As shown in fig. 7, the output end of the air injection seat 8 is fixedly connected with one end of the telescopic tube 702, an air extraction plate 801 is arranged in sliding fit in the air injection seat 8, a tension spring 802 is fixedly connected with one side of the air extraction plate 801, the other end of the tension spring 802 is fixedly connected with the inner wall of the air injection seat 8, a roller rod 803 is fixedly connected with the other side of the air extraction plate 801, and the roller rod 803 and the inner wall of the air injection seat 8 penetrate through in sliding fit. The tension spring 802 drives the air extraction plate 801 to automatically reset for air extraction, and the inner walls of the input end and the output end of the air injection seat 8 are provided with one-way valves.
As shown in fig. 8, the transmission mechanism 9 includes an electric push rod 901, the electric push rod 901 is rotatably connected with the jet seat 8, a rubber wheel 902 is fixedly connected with the output end of the electric push rod 901, the rubber wheel 902 is in friction contact with the outer wall of the belt pulley 202, and a driving wheel 903 is fixedly connected with one end of the electric push rod 901.
The driving wheel 903 is provided with a driven wheel 904 in a meshed transmission way, the driven wheel 904 is rotatably connected with the air injection seat 8, one end of the driven wheel 904 is fixedly connected with a concave-convex disc 905, and the outer wall of the concave-convex disc 905 is in sliding contact with a roller on the roller rod 803. When the belt pulley 202 rotates, the rubber wheel 902 in friction contact can be driven to rotate, at the moment, the rubber wheel 902 can drive the driving wheel 903 connected with the electric push rod 901 to rotate, at the moment, the driving wheel 903 can drive the concave-convex disc 905 connected with the driven wheel 904 to rotate, at the moment, the concave-convex disc 905 can contact with the roller rod 803, so that the roller rod 803 is pushed, the roller rod 803 drives the connected air extraction plate 801 to move, the air extraction plate 801 can quickly press air in the air injection seat 8 into the telescopic pipe 702, and the air injection pipe 701 connected with the telescopic pipe 702 is sprayed out.
The working principle is that when the sliding table 3 is required to be retracted to one side of the die carrier 1 after being used, the motor 203 is utilized to drive the connected belt pulley 202 to rotate, and at the moment, the belt pulley 202 drives the driving belt 201, so that the driving belt 201 can drive the sliding table 3 to move, and meanwhile, the electric push rod 901 drives the connected rubber wheel 902 to move downwards and contact the outer wall of the belt pulley 202;
Then when a transmission rack 603 on the sliding table 3 is meshed with the transmission wheel 602, a worm 604 connected with a universal joint A601 can be driven to rotate, so that the worm 604 can drive a push rod group 606 connected with a worm wheel 605 to rotate, and the push rod group 606 can drive a sliding table surface maintenance plate 7 to move;
Then, the rubber strip at the lower side of the sliding table surface maintenance plate 7 is in sliding contact with the surface of the sliding table 3, and meanwhile, when the sliding table surface maintenance plate 7 moves, a pull rope 705 connected with one end of the brush rod 703 can be pulled out, and at the moment, the brush rod 703 can be driven to rotate so as to clean metal scraps on the surface of the sliding table 3;
Meanwhile, when the belt pulley 202 rotates, the rubber wheel 902 in friction contact can be driven to rotate, at the moment, the rubber wheel 902 can drive the driving wheel 903 connected with the electric push rod 901 to rotate, at the moment, the driving wheel 903 can drive the concave-convex disc 905 connected with the driven wheel 904 to rotate, at the moment, the concave-convex disc 905 can contact with the roller rod 803, so that the roller rod 803 is pushed, the roller rod 803 drives the connected air extraction plate 801 to move, the air extraction plate 801 can quickly press air in the air injection seat 8 into the telescopic pipe 702, and the air injection pipe 701 connected with the telescopic pipe 702 is used for ejecting the air, so that metal scraps on the surface maintenance plate 7 and the sliding table 3 of the sliding table can be quickly cleaned;
Meanwhile, when the sliding table surface maintenance plate 7 moves away, the trapezoid trigger block 503 contacted with the sliding table surface maintenance plate is not limited, and at the moment, under the action of the spring 504, the connected adjusting rack 502 can be driven to move, so that the adjusting rack 502 can drive the protection plate 5 connected with the turning gear 501 to turn over, and the protection plate is blocked above the sliding table 3.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202511029752.5A CN120572495A (en) | 2025-07-25 | 2025-07-25 | A variable distance module slide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202511029752.5A CN120572495A (en) | 2025-07-25 | 2025-07-25 | A variable distance module slide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN120572495A true CN120572495A (en) | 2025-09-02 |
Family
ID=96854987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202511029752.5A Pending CN120572495A (en) | 2025-07-25 | 2025-07-25 | A variable distance module slide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN120572495A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN215701475U (en) * | 2021-08-17 | 2022-02-01 | 鄂州职业大学 | Bench worker practical training platform |
| CN115770809A (en) * | 2022-11-15 | 2023-03-10 | 明泰精密冲压(吴江)有限公司 | Automatic stamping equipment |
| WO2023056684A1 (en) * | 2021-10-09 | 2023-04-13 | 苏州奇端智能科技有限公司 | Precisely controlled anti-collision slow-conveying system and method for using same |
| CN116241622A (en) * | 2023-01-04 | 2023-06-09 | 上海狄兹精密机械股份有限公司 | But range module slip table |
| CN220806004U (en) * | 2023-07-06 | 2024-04-19 | 河北光兴半导体技术有限公司 | Chip welding device and processing system |
| CN118914964A (en) * | 2024-10-10 | 2024-11-08 | 南京飞腾电子科技有限公司 | A daily time calibration device for electric energy meters |
| CN119276210A (en) * | 2024-10-02 | 2025-01-07 | 江苏银奥智能科技有限公司 | A photovoltaic charging device for energy-saving inland electric extended-range cargo ships |
-
2025
- 2025-07-25 CN CN202511029752.5A patent/CN120572495A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN215701475U (en) * | 2021-08-17 | 2022-02-01 | 鄂州职业大学 | Bench worker practical training platform |
| WO2023056684A1 (en) * | 2021-10-09 | 2023-04-13 | 苏州奇端智能科技有限公司 | Precisely controlled anti-collision slow-conveying system and method for using same |
| CN115770809A (en) * | 2022-11-15 | 2023-03-10 | 明泰精密冲压(吴江)有限公司 | Automatic stamping equipment |
| CN116241622A (en) * | 2023-01-04 | 2023-06-09 | 上海狄兹精密机械股份有限公司 | But range module slip table |
| CN220806004U (en) * | 2023-07-06 | 2024-04-19 | 河北光兴半导体技术有限公司 | Chip welding device and processing system |
| CN119276210A (en) * | 2024-10-02 | 2025-01-07 | 江苏银奥智能科技有限公司 | A photovoltaic charging device for energy-saving inland electric extended-range cargo ships |
| CN118914964A (en) * | 2024-10-10 | 2024-11-08 | 南京飞腾电子科技有限公司 | A daily time calibration device for electric energy meters |
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