CN107490523B - Full-automatic cutting tool cutting efficiency test machine - Google Patents
Full-automatic cutting tool cutting efficiency test machine Download PDFInfo
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- CN107490523B CN107490523B CN201710645307.0A CN201710645307A CN107490523B CN 107490523 B CN107490523 B CN 107490523B CN 201710645307 A CN201710645307 A CN 201710645307A CN 107490523 B CN107490523 B CN 107490523B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/58—Investigating machinability by cutting tools; Investigating the cutting ability of tools
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/005—Electromagnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0688—Time or frequency
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- Sampling And Sample Adjustment (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a cutting efficiency testing machine for a full-automatic cutting tool, and belongs to the technical field of mechanical equipment. The technical problems that in the prior art, the testing tension of an electrical tool is not constant, the reliability of obtained data is low and the like are solved. It includes the frame, and frame one side is provided with timing system, timing system in be provided with the constant force piece, the constant force piece can reciprocate along vertical direction in timing system, be provided with drive assembly on the constant force piece drive assembly connect and still be provided with sample feed mechanism in the cutting means that awaits measuring goes up the frame. The constant force block is adopted to drive the electric tool, so that the constant testing force is ensured, and the situation that the obtained data is larger or smaller due to the influence of too large or too small testing force is avoided.
Description
Technical Field
The invention belongs to the technical field of mechanical equipment, and relates to a cutting efficiency testing machine for a full-automatic cutting tool.
Background
The electric tool brings convenience to daily life and greatly improves the production efficiency. Generally, electric tools are classified into electric drills, electric grinders, electric wrenches, electric impact drills, and electric cutting tools, among which electric cutting tools are electric tools commonly used in daily life, particularly electric circular saws. An electric circular saw is an electric tool which uses a motor as power and then drives a circular saw blade to cut through transmission. The electric tool has the characteristics of safety, reliability and high working efficiency, wherein the working efficiency is a standard for measuring the quality of one electric circular saw and the electric tool. Generally, the work efficiency of an electric circular saw described on the market is often the rated power of the electric circular saw, and the work performance of the electric circular saw is expressed in the magnitude of the rated power. Also, the expression of the performance efficiency of the electric circular saw is not intuitive.
The cutting efficiency of the electric cutting tool is measured according to the distance of the electric tool for cutting the sample in unit time, the electric cutting tool has the characteristics of intuition and clearness, constant pulling force is applied in a fixed distance to drive the electric tool to cut the sample, the time for finishing cutting is measured, and the cutting distance of the electric cutting tool in unit time, namely the cutting efficiency of the electrical cutting tool, is calculated. Generally, the test is a manual means, namely, the electric cutting tool to be tested is manually applied with thrust, the meter is manually clamped and timed, the cutting efficiency of the electric cutting tool is roughly calculated, but the force application error of a force applicator is not easy to control, and the manual error exists in timing, so that the reliability of the measured cutting efficiency is low.
Disclosure of Invention
The invention aims to solve the problems and defects and provides a cutting efficiency testing machine for a full-automatic cutting tool. The technical defects that the testing force is not constant and the timing is inaccurate in the prior art are overcome.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a full-automatic cutting tool cutting efficiency test machine, includes the frame, its characterized in that, frame one side be provided with timing system, timing system in be provided with the constant force piece, the constant force piece can reciprocate along vertical direction in timing system, be provided with drive assembly on the constant force piece drive assembly connect on the cutting tool that awaits measuring.
In the cutting efficiency testing machine for the full-automatic cutting tool, the timing system comprises a mounting plate, a cylindrical shield is fixedly mounted on the mounting plate, the axis of the shield is perpendicular to the horizontal plane, and a first sensor and a second sensor are respectively arranged at the upper end and the lower end of the shield.
In the cutting efficiency testing machine of the fully automatic cutting tool, the first sensor is fixedly connected to the side wall of the shield, and the second sensor is detachably connected to the shield and can change the installation position in the axial direction of the shield.
In the cutting efficiency testing machine for the full-automatic cutting tool, the first sensor is fixedly mounted on the first support, the first support is fixedly mounted on the protective cover, the second sensor is connected with the second support, the second support is fixedly mounted on the protective cover, the second support is provided with an adjusting groove, and the second sensor can slide in the adjusting groove and is detachably connected in the adjusting groove.
In the cutting efficiency testing machine for the full-automatic cutting tool, the transmission assembly comprises a transmission steel wire, one end of the transmission steel wire is fixedly connected to the constant force block, and the other end of the transmission steel wire is detachably connected to the cutting tool to be tested.
In the cutting efficiency testing machine for the full-automatic cutting tool, the transmission assembly further comprises a turning pulley, the turning pulley is provided with a pulley groove, the transmission steel wire is clamped in the pulley groove, and the turning pulley is fixedly installed on the installation plate through a pulley support.
In the cutting efficiency testing machine for the full-automatic cutting tool, the pulley support comprises a fixed plate, two limiting plates are symmetrically arranged below the fixed plate, equal-height blocks are arranged between the limiting plates, two clamping blocks are arranged below the equal-height blocks, a wire feeding groove is formed between the clamping blocks, and an adjusting rod penetrates through the clamping blocks.
In the cutting efficiency testing machine for the full-automatic cutting tool, the rack is further provided with a sample feeding mechanism, the sample feeding mechanism comprises a first clamping jaw and a second clamping jaw, the first clamping jaw and the second clamping jaw are arranged in parallel, vertical drivers are respectively arranged on the first clamping jaw and the second clamping jaw, the first clamping jaw is provided with a first guide rod vertical to the horizontal plane, and the second clamping jaw is provided with a second guide rod vertical to the horizontal plane.
In the cutting efficiency testing machine for the full-automatic cutting tool, the first guide rod penetrates through the first guide plate, the second guide rod penetrates through the second guide plate, the first guide plate is fixedly installed on the machine frame, the second guide plate is slidably connected to the machine frame, two sliding groove blocks are arranged below the second guide plate, a sliding rail is arranged between each sliding groove block and the second guide plate, the sliding groove blocks are clamped on the sliding rail, and the second guide plate is further connected with a horizontal driver.
In the cutting efficiency testing machine of the full-automatic cutting tool, the first clamping jaw and the second clamping jaw are in a square frame shape, the roller assembly is arranged on the upper surface of the machine frame, and the first clamping jaw and the second clamping jaw are sleeved on the roller assembly.
The invention has the advantages that:
1. the constant force block is adopted to drive the electric tool, so that the testing force is constant, and the influence of overlarge or undersize testing force on the obtained data is avoided.
2. The sensor is adopted to test the time points of the constant block passing twice, and the difference between the time points is calculated as the test time, so that the method is accurate and effective.
3. And a test sample feeding mechanism is adopted, so that the automation degree of equipment is increased, the labor is reduced, and the labor degree is reduced.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic view of the structure proposed by the present invention;
FIG. 2 is a schematic view of a disassembled structure of a buffer spring seat in the invention;
FIG. 3 is a schematic diagram of a timing system provided by the present invention;
fig. 4 is a schematic structural view of a sample feeding mechanism provided by the present invention.
In the figure, a machine frame 1, a timing system 2, a mounting plate 21, a shield 22, a first sensor 23, a first bracket 231, a second sensor 24, a second bracket 241, an adjusting groove 242, a constant force block 3, a transmission assembly 4, a transmission steel wire 41, a direction-changing pulley 42, a pulley bracket 43, a fixing plate 431, a limiting plate 432, an equal-height block 433, a clamping block 434, an adjusting rod 435, a sample feeding mechanism 5, a vertical driver 51, a first clamping jaw 6, a first guide rod 61, a first guide plate 62, a horizontal driver 63, a second clamping jaw 7, a second guide rod 71, a second guide plate 72, a sliding groove block 73, a sliding rail 74, a roller assembly 8 and a cutting tool a to be measured.
Detailed Description
As shown in fig. 1 and 2, an embodiment of the present invention is a cutting efficiency testing machine for a full-automatic cutting tool, including a machine frame 1, and is characterized in that a timing system 2 is disposed on one side of the machine frame 1, a constant force block 3 is disposed in the timing system 2, the constant force block 3 can move up and down in the timing system 2 along a vertical direction, and a transmission assembly 4 is disposed on the constant force block 3. The transmission assembly 4 is connected to the cutting tool a to be measured.
Only be gravity in the external world application of constant force piece 3, constant force piece 3 passes through drive assembly 4 to be connected on the cutting means a that awaits measuring, and according to the effect transmissibility of power, the cutting means a that awaits measuring only receives the gravity of constant force piece 3, and this gravity can be regarded as invariable. The friction in the transmission assembly 4 is also regarded as constant.
Under the invariable pulling force effect of constant force piece 3, linear motion is done in the drive of cutting means a that awaits measuring and cuts test sample, and in the cutting process, the cutting means a movement distance that awaits measuring is the movement distance of constant force piece 3, and constant force piece 3 is through timing system 2 simultaneously, and timing system 2 notes 3 movement time of constant force piece. And calculating the movement distance of the cutting tool a to be tested in normal work within unit time according to the movement distance and the movement time of the constant force block 3, namely the working efficiency of the cutting tool a to be tested on a certain test sample under a certain test force.
In this technical solution, specifically, the timing system 2 includes a mounting plate 21, a cylindrical shield 22 is fixedly mounted on the mounting plate 21, an axis of the shield 22 is perpendicular to a horizontal plane, and a first sensor 23 and a second sensor 24 are respectively disposed at upper and lower ends of the shield 22.
The first sensor 23 is installed at the initial position of the constant force block 3, when the constant force block drives the cutting tool a to be measured to cut, the constant force block 3 moves away from the first sensor 23, the first sensor 23 sends out a timing signal, and when the constant force block 3 moves to the range of the second sensor 24, the second sensor 24 sends out a signal for stopping timing, and the timing is completed. Meanwhile, the distance between the first sensor 23 and the second sensor 24 is the distance traveled by the constant force block 3, and is also the distance traveled by the cutting tool a to be measured.
In the present invention, it is preferable that the first sensor 23 is fixedly attached to a sidewall of the shield 22, and the second sensor 24 is detachably attached to the shield 22 and can change the mounting position in the axial direction of the shield. The position of the second sensor 24 is adjusted to change the moving distance of the constant force block 3, i.e., to set the test distance of the cutting tool a to be tested.
Preferably, the first sensor 23 is fixedly installed on the first bracket 231, the first bracket 231 is fixedly installed on the shield 22, the second sensor 24 is connected with the second bracket 241, the second bracket 241 is fixedly installed on the shield 22, the second bracket 241 is provided with an adjusting groove 242, and the second sensor 24 can slide in the adjusting groove 242 and can be detachably connected in the adjusting groove 242. The distance between the second sensor 24 and the first sensor 23 is convenient to adjust, and the precision is kept.
In the present invention, as shown in fig. 3, the transmission assembly 4 includes a transmission steel wire 41, one end of the transmission steel wire 41 is fixedly connected to the constant force block 3, and the other end of the transmission steel wire 41 is detachably connected to the cutting tool a to be measured.
The transmission assembly 4 further comprises a direction-changing pulley 42, the direction-changing pulley 42 is provided with a pulley groove, the transmission steel wire 41 is clamped in the pulley groove, and the direction-changing pulley 42 is fixedly installed on the installation plate 21 through a pulley support 43. Through the connection of the transmission steel wire 41, the sliding resistance is small, the gravity borne by the constant force block 3 is ensured to approach the testing force borne by the cutting tool a to be tested, and meanwhile, the external force is prevented from participating in the interference of the testing force constancy.
Preferably, the pulley bracket 43 includes a fixed plate 431, two limiting plates 432 are symmetrically disposed below the fixed plate 431, an equal-height block 433 is disposed between the limiting plates 432, two clamping blocks 434 are disposed below the equal-height block 433, a wire feeding groove is disposed between the clamping blocks 434, and an adjusting rod 435 is disposed on the clamping blocks 434 in a penetrating manner. The friction between the transmission steel wire 41 and fixed parts such as the frame 1 and the like is prevented, and the constancy of the testing force applied by the constant force block 3 is prevented from being damaged.
In the invention, the rack 1 is also provided with a sample feeding mechanism 5, the sample feeding mechanism 5 comprises a first clamping jaw 6 and a second clamping jaw 7, the first clamping jaw 6 and the second clamping jaw 7 are arranged in parallel, vertical drivers 51 are respectively arranged on the first clamping jaw 6 and the second clamping jaw 7, the first clamping jaw 6 is provided with a first guide rod 61 vertical to the horizontal plane, and the second clamping jaw 7 is provided with a second guide rod 71 vertical to the horizontal plane.
The first clamping jaw 6 and the second clamping jaw 7 are independently controlled respectively, the two linear drivers 51 control the first clamping jaw 6 and the second clamping jaw 7 to do vertical movement respectively, in the cutting test process, the first clamping jaw 6 and the second clamping jaw 7 move downwards, the vertical driving mechanism 51 keeps the downward state, and the first clamping jaw 6 and the second clamping jaw 7 fasten a test sample on a rack.
Preferably, the first guide rod 61 is inserted in the first guide plate 62, the second guide rod 71 is inserted in the second guide plate 72, the first guide plate 62 is fixedly mounted on the frame 1, the second guide plate 72 is slidably connected to the frame 1, two chute blocks 73 are disposed below the second guide plate 72, a slide rail 74 is disposed between the chute blocks 73 and the second guide plate 72, the chute blocks 73 are connected to the slide rail 74 in a clamping manner, and the second guide plate 72 is further connected with the horizontal driver 65.
After the test is finished, the vertical driver 51 drives the first clamping jaw 6 to be lifted, the second clamping jaw 7 is kept downward and is abutted against a test sample, the horizontal driver 65 drives the second guide plate 72 to move towards the first clamping jaw 6 along the slide rail 74, after the vertical driver 51 drives the first clamping jaw 6 to move downward after the vertical driver moves to the set position, after the test sample is clamped, the vertical driver 51 drives the second clamping jaw 7 to be lifted upward, then the horizontal driver 65 drives the second guide plate 72 to drive the second clamping jaw 7 to move towards the direction far away from the first clamping jaw 6, and then the direct driver 51 drives the second clamping jaw 7 to move downward to clamp the test sample.
Preferably, the first clamping jaw 6 and the second clamping jaw 7 are in a square frame shape, a test sample is framed in the first clamping jaw 6 and the second clamping jaw 7, the position of the test sample is limited, and the test sample is prevented from displacement sliding in the test process to influence the test result. The upper surface of the frame 1 is provided with a roller assembly 8, and the first clamping jaw 6 and the second clamping jaw 7 are sleeved on the roller assembly 8. The test sample conveying device is beneficial to conveying the test sample conveniently and reducing the friction resistance.
The working principle of the invention is as follows:
only be gravity in the external world application of constant force piece 3, constant force piece 3 passes through drive assembly 4 to be connected on the cutting means a that awaits measuring, and according to the effect transmissibility of power, the cutting means a that awaits measuring only receives the gravity of constant force piece 3, and this gravity can be regarded as invariable. The friction in the transmission assembly 4 is also regarded as constant.
Under the invariable pulling force effect of constant force piece 3, linear motion is done in the drive of cutting means a that awaits measuring and cuts test sample, and in the cutting process, the cutting means a movement distance that awaits measuring is the movement distance of constant force piece 3, and constant force piece 3 is through timing system 2 simultaneously, and timing system 2 notes 3 movement time of constant force piece. And calculating the movement distance of the cutting tool a to be tested in normal work within unit time according to the movement distance and the movement time of the constant force block 3, namely the working efficiency of the cutting tool a to be tested on a certain test sample under a certain test force.
The first sensor 23 is installed at the initial position of the constant force block 3, when the constant force block drives the cutting tool a to be measured to cut, the constant force block 3 moves away from the first sensor 23, the first sensor 23 sends out a timing signal, and when the constant force block 3 moves to the range of the second sensor 24, the second sensor 24 sends out a signal for stopping timing, and the timing is completed. Meanwhile, the distance between the first sensor 23 and the second sensor 24 is the distance traveled by the constant force block 3, and is also the distance traveled by the cutting tool a to be measured.
The first clamping jaw 6 and the second clamping jaw 7 are independently controlled respectively, the two linear drivers 51 control the first clamping jaw 6 and the second clamping jaw 7 to do vertical movement respectively, in the cutting test process, the first clamping jaw 6 and the second clamping jaw 7 move downwards, the vertical driving mechanism 51 keeps the downward state, and the first clamping jaw 6 and the second clamping jaw 7 fasten a test sample on a rack.
After the test is completed, the vertical driver 51 drives the first clamping jaw 6 to be lifted, the second clamping jaw 7 is kept downward and is abutted against the test sample, the horizontal driver 65 drives the second guide plate 72 to move towards the direction of the first clamping jaw 6 along the slide rail 74, after the vertical driver 51 drives the first clamping jaw 6 to move downward after the vertical driver moves to the set position, the vertical driver 51 drives the second clamping jaw 7 to be lifted upward after the test sample is clamped, then the horizontal driver 65 drives the second guide plate 72 to drive the second clamping jaw 7 to move towards the direction far away from the first clamping jaw 6, and then the direct driver 51 drives the second clamping jaw 7 to move downward to clamp the test sample and enter the second test.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although the terms of the rack 1, the timing system 2, the mounting plate 21, the shield 22, the first sensor 23, the first bracket 231, the second sensor 24, the second bracket 241, the adjustment groove 242, the constant force block 3, the transmission assembly 4, the transmission wire 41, the direction-changing pulley 42, the pulley bracket 43, the fixing plate 431, the limit plate 432, the height block 433, the clamp block 434, the adjustment rod 435, the sample feeding mechanism 5, the vertical driver 51, the first jaw 6, the first guide bar 61, the first guide plate 62, the horizontal driver 63, the second jaw 7, the second guide bar 71, the second guide plate 72, the chute block 73, the slide rail 74, the roller assembly 8, the cutting tool a to be measured, and the like are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (8)
1. A cutting efficiency testing machine for a full-automatic cutting tool comprises a rack (1) and is characterized in that a timing system (2) is arranged on one side of the rack (1), a constant force block (3) is arranged in the timing system (2), the constant force block (3) can move up and down in the timing system (2) along the vertical direction, a transmission assembly (4) is arranged on the constant force block (3), and the transmission assembly (4) is connected to a cutting tool (a) to be tested;
the sample feeding mechanism (5) is further arranged on the rack (1), the sample feeding mechanism (5) comprises a first clamping jaw (6) and a second clamping jaw (7), the first clamping jaw (6) and the second clamping jaw (7) are arranged in parallel, vertical drivers (51) are respectively arranged on the first clamping jaw (6) and the second clamping jaw (7), a first guide rod (61) vertical to the horizontal plane is arranged on the first clamping jaw (6), and a second guide rod (71) vertical to the horizontal plane is arranged on the second clamping jaw (7);
first guide arm (61) wear to establish on first deflector (62), second guide arm (71) wear to establish on second deflector (72), first deflector (62) fixed mounting on frame (1), second deflector (72) sliding connection on frame (1), second deflector (72) under be provided with two spout pieces (73), spout piece (73) and second deflector (72) between be provided with slide rail (74), spout piece (73) joint on slide rail (74), second deflector (72) on still be connected with horizontal drive ware (63).
2. The cutting efficiency testing machine of the full-automatic cutting tool as claimed in claim 1, wherein said timing system (2) comprises a mounting plate (21), a cylindrical shield (22) is fixedly mounted on said mounting plate (21), the axis of said shield (22) is perpendicular to the horizontal plane, and the upper and lower ends of said shield (22) are respectively provided with a first sensor (23) and a second sensor (24).
3. The cutting efficiency testing machine of the full automatic cutting tool as claimed in claim 2, wherein said first sensor (23) is fixedly connected to the side wall of the shroud (22), and said second sensor (24) is detachably connected to the shroud (22) and can change the installation position in the axial direction of the shroud.
4. The cutting efficiency testing machine of the full-automatic cutting tool as claimed in claim 3, wherein the first sensor (23) is fixedly installed on a first bracket (231), the first bracket (231) is fixedly installed on the shield (22), the second sensor (24) is connected with a second bracket (241), the second bracket (241) is fixedly installed on the shield (22), the second bracket (241) is provided with an adjusting groove (242), and the second sensor (24) can slide in the adjusting groove (242) and is detachably connected in the adjusting groove (242).
5. The cutting efficiency testing machine of the full-automatic cutting tool according to claim 1, wherein the transmission assembly (4) comprises a transmission steel wire (41), one end of the transmission steel wire (41) is fixedly connected to the constant force block (3), and the other end of the transmission steel wire (41) is detachably connected to the cutting tool (a) to be tested.
6. The cutting efficiency testing machine of the full-automatic cutting tool is characterized in that the transmission assembly (4) further comprises a direction-changing pulley (42), the direction-changing pulley (42) is provided with a pulley groove, the transmission steel wire (41) is clamped in the pulley groove, and the direction-changing pulley (42) is fixedly arranged on the mounting plate (21) through a pulley bracket (43).
7. The cutting efficiency testing machine of the full-automatic cutting tool according to claim 6, wherein the pulley bracket (43) comprises a fixed plate (431), two limiting plates (432) are symmetrically arranged below the fixed plate (431), equal-height blocks (433) are arranged between the limiting plates (432), two clamping blocks (434) are arranged below the equal-height blocks (433), a wire feeding groove is formed between the clamping blocks (434), and an adjusting rod (435) penetrates through the clamping blocks (434).
8. The cutting efficiency testing machine of the full-automatic cutting tool according to claim 1, characterized in that the first clamping jaw (6) and the second clamping jaw (7) are in a square frame shape, a roller assembly (8) is arranged on the upper surface of the machine frame (1), and the first clamping jaw (6) and the second clamping jaw (7) are sleeved on the roller assembly (8).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710645307.0A CN107490523B (en) | 2017-08-01 | 2017-08-01 | Full-automatic cutting tool cutting efficiency test machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710645307.0A CN107490523B (en) | 2017-08-01 | 2017-08-01 | Full-automatic cutting tool cutting efficiency test machine |
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| CN107490523A CN107490523A (en) | 2017-12-19 |
| CN107490523B true CN107490523B (en) | 2020-05-19 |
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| CN110006772A (en) * | 2019-04-17 | 2019-07-12 | 永康市磨鹰磨具有限公司 | Automate grinding wheel performance detection apparatus |
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| US5191700A (en) * | 1990-12-12 | 1993-03-09 | General Electric Company | Method for making packets of amorphous metal strip for transformer-core manufacture |
| CN102602764A (en) * | 2011-01-21 | 2012-07-25 | 东芝电梯株式会社 | Idle detection device of elevator drive |
| CN202271452U (en) * | 2011-09-26 | 2012-06-13 | 西安理工大学 | Device for cutting hard and brittle material by fret saw with constant force |
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| CN107490523A (en) | 2017-12-19 |
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