CN108335589B - Experimental instrument for accurately measuring friction coefficient of micro-motion inclined plane of diamond lifting frame - Google Patents
Experimental instrument for accurately measuring friction coefficient of micro-motion inclined plane of diamond lifting frame Download PDFInfo
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Abstract
The invention relates to an experimental instrument for accurately measuring friction coefficient of a micro-motion inclined plane of a diamond lifting frame, which consists of a rotating inclined plane part and an experimental plane part, wherein the experimental plane part comprises an experimental plane adjustable supporting leg, an experimental plane lower cross beam, an experimental plane vertical rod and an experimental plane; the rotating inclined plane part comprises leveling supporting legs, a vertical supporting rod of a rotating inclined plane bracket, a lower cross beam of the rotating inclined plane bracket, a right longitudinal beam in the middle of the diamond lifting frame, a left longitudinal beam in the middle of the diamond lifting frame, an upper cross beam of the rotating inclined plane bracket, the diamond lifting frame, a sliding rod sliding groove, a sliding beam of the rotating inclined plane, a rotating inclined plane and a scale system. The beneficial effects of the invention are as follows: the invention avoids the protruding part above the rotating inclined plane no matter the initial state or the final state of the rotating inclined plane, also increases the integral stability of the experimental instrument, and brings great convenience for the operation and measurement of an experimenter.
Description
Technical Field
The invention relates to an experimental instrument, in particular to an experimental instrument for accurately measuring friction coefficient of a micro-motion inclined plane of a diamond lifting frame.
Background
The method for measuring the dynamic friction coefficient and the static friction coefficient is various, and the inclined plane method is definitely the simplest and most convenient one. Although measuring instruments for dynamic and static friction coefficients of various materials are already available on the market, no instrument for measuring dynamic and static friction coefficients by continuously and accurately changing the inclination angle of an inclined plane in a laboratory of a university or middle school at present is seen. Even abroad, no experimental instrument for adjusting inclined plane inclination angle by adopting a mechanical micro-dynamic inclined plane is adopted. The old method for measuring the inclined plane inclination angle by manually lifting the inclined plane to rotate around the low-end rotating shaft is widely adopted, and the inclined plane inclination angle is changed by using the operation method with variability, low precision and large error. At present, the photoelectric method is adopted to accurately measure the inclined plane inclination angle in the market, so that the power is consumed, and the energy conservation and the environmental protection are not facilitated. The applicant applied for patent number ZL201310328276.8 on 12 months and 2 days in 2015 "experimental instrument for measuring static and dynamic friction coefficient of inclined plane and cylinder rolling friction coefficient by fine tuning with high precision", and the following defects still exist although mechanical screw rods are adopted to continuously and accurately change inclined plane inclination angles to measure dynamic and static friction coefficients of various materials: (1) The inclined plane terminal fixed shaft slideway and the vernier slideway are adopted at one side of the inclined plane, so that great inconvenience is caused to the operation of an experimenter, and the experimenter is difficult to observe and measure experimental phenomena; (2) A plurality of slide ways and a major scale with large diameter are adopted, so that materials are wasted and the manufacturing cost is high; (3) Fixing the vernier on the side of the rotating inclined plane is difficult and unstable; (4) Fixing a vernier slide rail and a slide shaft slide rail frame of a slope terminal on the side surface of the rotating slope, and bringing inconvenience to experimenters in observing experimental phenomena and measuring parameters; (5) The adoption of single cursor reading can bring an irremovable system error to the measurement of the inclination angle of the rotating inclined plane.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an experimental instrument for accurately measuring friction coefficient of a micro-motion inclined plane of a diamond lifting frame.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the experimental instrument for accurately measuring the friction coefficient of the micro-motion inclined plane of the diamond lifting frame comprises a rotating inclined plane part and an experimental plane part, wherein the experimental plane part comprises an experimental plane adjustable supporting leg, an experimental plane lower cross beam, an experimental plane vertical rod and an experimental plane; the rotary inclined surface part comprises leveling supporting legs, a vertical supporting rod of a rotary inclined surface bracket, a lower cross beam of the rotary inclined surface bracket, a right longitudinal beam in the middle of the diamond lifting frame, a left longitudinal beam in the middle of the diamond lifting frame, an upper cross beam of the rotary inclined surface bracket, the diamond lifting frame, a sliding rod sliding groove, a rotary inclined surface sliding beam, a rotary inclined surface and a scale system;
the left rotating shaft sleeve fixed end of the left rotating shaft sleeve is welded at the left side position on the front surface of the right cross beam of the rotating inclined plane, and the left rotating shaft penetrates into the left rotating shaft sleeve and is welded at the left side position of the front end surface of the rotating inclined plane; the fixed end of the right rotating shaft sleeve is welded at the right side position on the front surface of the right cross beam of the rotating inclined plane, the right rotating shaft penetrates into the right rotating shaft sleeve, a vernier scale disc seat of the scale system is sleeved on the right rotating shaft, and the fixed end of the right rotating shaft is welded at the corresponding position on the right side surface of the rotating inclined plane;
the supporting edges of the diamond lifting frames are U-shaped, and two side surfaces of one end of the upper left supporting edge of the diamond lifting frame, the lower left supporting edge of the diamond lifting frame, the upper right supporting edge of the diamond lifting frame and one end of the lower right supporting edge of the diamond lifting frame are respectively punched with a left supporting edge rotating ferrule of the diamond lifting frame, a right supporting edge rotating ferrule of the diamond lifting frame and a right supporting edge rotating ferrule of the diamond lifting frame; the left support side on the diamond lifting frame, the left support side under the diamond lifting frame, the right support side on the diamond lifting frame and the right support side under the diamond lifting frame are symmetrically and fixedly connected with the left gear on the diamond lifting frame, the left gear under the diamond lifting frame, the right gear on the diamond lifting frame and the right gear under the diamond lifting frame, and the left rotating ring on the diamond lifting frame, the right rotating ring on the diamond lifting frame, the left rotating ring on the diamond lifting frame, the right rotating ring on the diamond lifting frame;
the pull screw rod screw passes through the threaded hole of the pull rod and the left bidirectional rotating shaft on the supporting side, after the front end of the pull screw rod is sleeved into the left blocking protrusion of the pull screw rod sliding shaft to the corresponding position, the pull screw rod sliding shaft at the end part of the pull screw rod extends into the screw rod end sliding shaft Kong Zhitong of the pull rod and the right bidirectional rotating shaft on the supporting side to be exposed, and the pull screw rod sliding shaft end blocking protrusion is arranged at the front end of the pull screw rod sliding shaft.
As preferable: comprehensively positioning the right rotating shaft, the vernier disc seat, the vernier disc and the main scale, wherein the positioning center is the central shaft position of the scale system; the right rotating shaft is coaxial with the left rotating shaft; the main scale chassis is screwed and reinforced at the corresponding position of the upper cross beam of the rotary inclined plane bracket and the right side surface of the vertical supporting rod of the rotary inclined plane bracket; the vernier disc base is in counterpoint welding with the right rotating shaft, the vernier disc is fixed in counterpoint by adopting a vernier disc fixing screw, and the left vernier, the right vernier and the main ruler are on the same horizontal plane.
As preferable: the width of the left supporting edge on the diamond lifting frame and the width of the right supporting edge on the diamond lifting frame are smaller than those of the left supporting edge under the diamond lifting frame and the right supporting edge under the diamond lifting frame, and the left supporting edge on the diamond lifting frame and the right supporting edge on the diamond lifting frame are sleeved in the left supporting edge under the diamond lifting frame and the right supporting edge under the diamond lifting frame.
As preferable: the left support side rotating ferrule on the diamond-shaped lifting frame correspondingly is put into the lower left support side rotating ferrule of the diamond-shaped lifting frame, the inner side of the lower left support side rotating ferrule penetrates through a tension rod and a left bidirectional rotating shaft of the support side, two sides of the left bidirectional rotating shaft are clamped by adopting clamping rings, a left gear on the diamond-shaped lifting frame is sleeved on the left rotating shaft on the diamond-shaped lifting frame, two sides of the left gear are clamped by adopting the clamping rings, and a left gear on the lower left gear of the diamond-shaped lifting frame is sleeved on the left rotating shaft under the diamond-shaped lifting frame, and two sides of the left gear are clamped by adopting the clamping rings; the right support side rotating ferrule on the diamond lifting frame corresponds to the right support side rotating ferrule under the diamond lifting frame, the inner side of the right support side rotating ferrule penetrates through a tension rod and the right bidirectional rotating shaft on the support side, two sides of the right bidirectional rotating shaft are clamped by clamping rings, the right gear on the diamond lifting frame is sleeved on the right rotating shaft on the diamond lifting frame, two sides of the right rotating shaft are clamped by the clamping rings, and the lower gear of the diamond lifting frame is sleeved on the right rotating shaft under the diamond lifting frame, and two sides of the right rotating shaft are clamped by the clamping rings.
As preferable: and two ends of a sliding rod at the upper end of the diamond lifting frame extend into front and rear diamond sliding rod sliding grooves respectively under the rotating inclined plane sliding beam, sliding rod fixing screw bolts are sleeved on the outer sides of the sliding rod sliding grooves at the two ends of the sliding rod respectively, and screw holes on the base of the diamond lifting frame are aligned with screw holes on a right longitudinal beam in the middle of the diamond lifting frame and a left longitudinal beam in the middle of the diamond lifting frame and are fixed by adopting diamond lifting frame base fixing screws.
The invention has the beneficial effects that:
(1) The lifting method of the diamond lifting frame is adopted, the inclination angle of the rotating inclined plane is changed by continuous inching, and the diamond lifting frame has the following characteristics: firstly, the upper end supporting seat and the base adopt double rotating shafts; secondly, the two-way rotating shafts are adopted for the connection between the adjacent sides on the supporting sides, so that the two-way rotating shafts participate in the longitudinal rotation, namely the rotation between the supporting sides, and also participate in the transverse rotation, namely the distance between the two sides is increased and reduced through the threaded rods; thirdly, in order to improve the stability of the end state of the diamond-shaped lifting frame, the upper supporting seat, the lower supporting seat and the base are respectively provided with double rotating shafts, and the adjacent supporting edge ends are respectively provided with gear engagement structures, so that the end state of each supporting edge in the rotating process can be mutually engaged with adjacent gears, and the stability of the diamond-shaped lifting frame is improved; fourth, in order to improve the stability of the experimental apparatus when the diamond-shaped lifting frame is lifted to a certain height, that is, the rotating inclined plane rotates to a certain angle, a special fastening screw structure is adopted to fasten the diamond-shaped lifting frame and the rotating inclined plane firmly together, so that the diamond-shaped lifting frame and the rotating inclined plane form a whole.
(2) The special structure of the rotating inclined plane rotating shaft and the special installation method adopt a special positioning method, ensure that the rotating shaft, the vernier disc and the main scale disc are coaxial, and simultaneously, also provide a manufacturing and installation method, namely, the rotating shaft end point and the vernier disc seat are coaxially welded, then the vernier disc is fixed on the vernier disc seat, and the vernier surface and the main scale disc surface are ensured to be on the same plane, so that an experimenter can conveniently and accurately read.
(3) The invention avoids the protruding part above the rotating inclined plane no matter the initial state or the final state of the rotating inclined plane, also increases the integral stability of the experimental instrument, and brings great convenience for the operation and measurement of an experimenter.
(4) In the process of lifting the height of the diamond-shaped lifting frame, the sliding rod arranged at the top end of the diamond-shaped lifting frame slides on the rotating inclined plane sliding beam, so that the aim of slightly changing the inclined plane inclination angle is fulfilled.
(5) Aiming at the experimental device structure, a reading method of a double vernier system with the mutual coordination of a main scale of 0-360 degrees and a vernier of 0' -30 ' is adopted, so that the accurate reading (the accuracy reaches 1 ') of the rotating angle of the rotating inclined plane is greatly improved, and meanwhile, the system error caused by the eccentric difference is eliminated.
(6) The special design structure adopted by the invention not only saves the manufacturing materials and the processing procedures of experimental instruments, reduces the production cost for manufacturers, but also has attractive overall structure and convenient use.
Drawings
FIG. 1 is a front view of the overall structure of the present invention;
FIG. 2 is a side view of an initial state of an integral part of a rotary ramp;
FIG. 3 is a front view of a diamond shaped crane with a ramp changed to an angle (α);
FIG. 4 is a front view of a diamond shaped crane;
FIG. 5 is a front view of each support side structure of the diamond-shaped crane;
FIG. 6 is a top view and two end side views of each support side of a diamond-shaped crane;
FIG. 7 is a schematic diagram of the connection of left and right support sides on a diamond-shaped crane;
FIG. 8 is a schematic diagram of the connection of the left and right support sides of a diamond-shaped lifting frame;
FIG. 9 is a side view of the upper and lower adjacent support sides of the diamond-shaped crane connected with a bi-directional rotating shaft;
FIG. 10 is a front view of a diamond shaped crane top structure;
FIG. 11 is a front view of a diamond shaped crane base;
FIG. 12 is a top view of the initial state of the diamond-shaped crane;
FIG. 13 is a front view of the slide bar and rotating ramp locking screw configuration;
FIG. 14 is a schematic view of a tension screw and a bi-directional rotating shaft;
FIG. 15 is a schematic view of the left and right rotational shafts of the rotating ramp and the welding of the left and right rotational shafts to the front end of the ramp and the cross beam surface;
FIG. 16 is a front view of the connection of the rotating bevel shaft and vernier disc, and a side view of the vernier disc, disc holder and shaft;
FIG. 17 is a schematic view showing the state of the initial and final readings of the vernier disc rotated by a certain angle by the rotating inclined plane;
FIG. 18 is a schematic diagram of reading accuracy of the reading system;
FIG. 19 is a schematic diagram of the principle of the double vernier correcting rotation spindle and the geometrical spindle being different from each other;
FIG. 20 is a diagram showing an example force analysis of high-precision measurement of dynamic and static friction coefficients on an inclined plane;
FIG. 21 is a schematic view of the rolling force of a cylinder on a slope.
Reference numerals illustrate: 0. leveling supporting legs, 1, rotating an inclined plane bracket vertical supporting rod, 2, rotating an inclined plane bracket lower cross beam, 3, a right longitudinal beam in the middle of a diamond lifting frame, 4, a left longitudinal beam in the middle of the diamond lifting frame, 5, a diamond lifting frame, 5-2, a diamond lifting frame lower left gear, 5-20, a diamond lifting frame lower right gear, 5-3, a diamond lifting frame upper left rotating shaft, 5-30, a diamond lifting frame upper right rotating shaft, 5-31, a diamond lifting frame upper left rotating shaft rotating ring, 5-301, a diamond lifting frame upper right rotating shaft rotating ring, 5-4, a diamond lifting frame lower left rotating shaft, 5-40, a diamond lifting frame lower right rotating shaft, 5-41, a diamond lifting frame lower left rotating shaft rotating ring, 5-401, a diamond lifting frame lower right rotating shaft rotating ring, 5-6, a diamond lifting frame upper left gear, 5-60, right gears on the diamond lifting frame, 5-11, left supporting edge on the diamond lifting frame, 5-12, right supporting edge on the diamond lifting frame, 5-13, right supporting edge under the diamond lifting frame, 5-14, left supporting edge under the diamond lifting frame, 5-15, left bidirectional rotation shafts of a tension rod and a supporting edge, 5-16, right bidirectional rotation shafts of the tension rod and the supporting edge, 5-150, left supporting edge on the diamond lifting frame, 5-151, left supporting edge under the diamond lifting frame, 5-160, right supporting edge on the diamond lifting frame, 5-161, right supporting edge under the diamond lifting frame, 5-00, diamond lifting frame base fixing screws, 5-10, diamond lifting frame base, 5-8, diamond lifting frame top support frame, 5-9 parts of a diamond lifting frame tension screw hand grab handle, 5-90 parts of a tension screw sliding shaft end blocking lug, 5-900 parts of a tension screw sliding shaft left blocking lug, 5-91 parts of a tension screw sliding shaft, 5-92 parts of a tension screw, 5-93 parts of a threaded hole, 5-94 parts of a screw end sliding shaft sliding hole, 6 parts of a sliding rod, 6-1 parts of a sliding rod fixing screw, 6-11 parts of a hollow section, 6-12 parts of a threaded section, 6-13 parts of a hexagonal screw wrench clamping hole, 6-14 parts of a hexagonal screw wrench head, 7 parts of a rotating inclined plane bracket upper cross beam, 7-1 parts of a rotating inclined plane right cross beam front surface, 8 parts of a sliding rod chute, 9 parts of a rotating inclined plane sliding beam, 10 parts of a rotating inclined plane, 11 parts of a scale system, 11-0, vernier disc fixing screws, 11-1, a main scale, 11-2, a vernier disc, 11-21, a left vernier, 11-22, a right vernier, 12, a central axis of a vernier system, 12-0, a vernier disc seat, 12-1, a right rotating shaft, 12-10, a right rotating shaft fixing end, 12-11, a right rotating shaft sleeve, 12-110, a right rotating shaft sleeve fixing end, 12-2, a left rotating shaft, 12-21, a left rotating shaft fixing end, 12-12, a left rotating shaft sleeve, 12-120, a left rotating shaft sleeve fixing end, 13, an experiment plane adjustable supporting leg, 14, an experiment plane lower beam, 15, an experiment plane vertical rod, 16 and an experiment plane.
Detailed Description
The invention is further described below with reference to examples. The following examples are presented only to aid in the understanding of the invention. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
The experimental instrument for accurately measuring the friction coefficient of the micro-motion inclined plane of the diamond lifting frame is integrally composed of a rotating inclined plane part and an experimental plane part. The experimental plane part is formed by welding four experimental plane adjustable supporting legs 13, four experimental plane lower cross beams 14, four experimental plane vertical rods 15 and experimental planes 16 with each other, as shown in fig. 1. The rotating inclined plane part comprises four leveling supporting legs 0, four vertical supporting rods 1 of a rotating inclined plane bracket, four lower cross beams 2 of the rotating inclined plane bracket, a right longitudinal beam 3 in the middle of a diamond-shaped lifting frame, a left longitudinal beam 4 in the middle of the diamond-shaped lifting frame, three upper cross beams 7 of the rotating inclined plane bracket, a diamond-shaped lifting frame 5, a sliding rod 6, a sliding rod fixing screw 6-1, a sliding rod sliding groove 8, a rotating inclined plane sliding beam 9, a rotating inclined plane 10, a scale system 11 and a scale system central shaft 12, as shown in figure 1.
Welding a left rotating shaft sleeve fixing end 12-120 of a left rotating shaft sleeve 12-12 at a proper position on the left side of the front surface 7-1 of the right cross beam of the rotating inclined plane, penetrating a left rotating shaft 12-2 into the left rotating shaft sleeve 12-12 and welding a left rotating shaft fixing end 12-21 at a proper position on the left side of the front end surface of the rotating inclined plane 10; the right rotating shaft sleeve fixing end 12-110 of the right rotating shaft sleeve 12-11 is welded at a proper position on the front surface 7-1 of the rotating inclined plane right cross beam, the right rotating shaft 12-1 is penetrated into the right rotating shaft sleeve 12-11, a vernier disc seat 12-0 of the vernier system 11 is sleeved on the right rotating shaft 12-1, the vernier disc seat 12-0, the vernier disc 11-2 and the main scale 11-1 are comprehensively positioned, the positioning center is the central shaft 12 position of the vernier system, the fixing position of the main scale chassis is determined, the main scale chassis is screwed and reinforced at the corresponding position of the right side surface on the upper cross beam 7 of the rotating inclined plane bracket and the vertical supporting rod 1 of the rotating inclined plane bracket, the vernier disc seat 12-0 and the right rotating shaft 12-1 are accurately aligned and welded according to the positioning result, the vernier disc 11-2 is aligned and fixed according to the positioning result by adopting a vernier disc fixing screw 11-0, the left vernier disc 11-21 and the right vernier disc 11-22 are ensured to be positioned on the same plane, and the right rotating shaft fixing end 12-1 is welded on the corresponding position 10 of the right rotating inclined plane on the right side surface of the rotating inclined plane of the right rotating shaft 12-1. In fixing the left and right rotational shafts 12-2 and 12-1, the left and right rotational shafts 12-2 and 12-1 are ensured to be coaxial, as shown in fig. 1, 2, 15, 16, 17.
The supporting edges of the diamond-shaped lifting frame 5 are pressed into U shapes by adopting steel plates with certain thickness, the upper left supporting edge 5-11 of the diamond-shaped lifting frame, the lower left supporting edge 5-14 of the diamond-shaped lifting frame, the upper right supporting edge 5-12 of the diamond-shaped lifting frame, and the two side surfaces of one end of the lower right supporting edge 5-13 of the diamond-shaped lifting frame are respectively punched with a larger diamond-shaped lifting frame upper left supporting edge rotating ferrule 5-150, a diamond-shaped lifting frame lower left supporting edge rotating ferrule 5-151, a diamond-shaped lifting frame upper right supporting edge rotating ferrule 5-160 and a diamond-shaped lifting frame lower right supporting edge rotating ferrule 5-161; the left supporting edge 5-11 on the diamond lifting frame, the left supporting edge 5-14 on the diamond lifting frame, the right supporting edge 5-12 on the diamond lifting frame, the left gear 5-6 on the diamond lifting frame, the left gear 5-2 on the diamond lifting frame, the right gear 5-60 on the diamond lifting frame and the right gear 5-20 on the diamond lifting frame, and the left rotating ring 5-31 on the diamond lifting frame, the right rotating ring 5-301 on the diamond lifting frame, the left rotating ring 5-41 on the diamond lifting frame, the right rotating ring 5-401 on the diamond lifting frame, the left rotating ring 5-41 on the diamond lifting frame, and the right rotating ring 5-401 on the diamond lifting frame, which correspond to the left rotating ring 5-4 on the diamond lifting frame and the right rotating ring 5-40 on the diamond lifting frame, are symmetrically and fixedly connected, and the left rotating ring 5-31 on the diamond lifting frame and the right rotating ring 5-401 on the diamond lifting frame, which correspond to the smaller diameters, are shown in fig. 5 and 6. The widths of the left supporting edge 5-11 on the diamond lifting frame, the right supporting edge 5-12 on the diamond lifting frame are slightly smaller than those of the left supporting edge 5-14 under the diamond lifting frame and the right supporting edge 5-13 under the diamond lifting frame, so that the widths of the left supporting edge 5-11 on the diamond lifting frame, the right supporting edge 5-12 on the diamond lifting frame can be just sleeved in the left supporting edge 5-14 under the diamond lifting frame and the right supporting edge 5-13 under the diamond lifting frame, and the widths are as shown in figures 2, 4 and 9.
The left supporting edge 5-11 on the diamond lifting frame, the right supporting edge 5-12 on the diamond lifting frame, the right supporting edge 5-13 on the diamond lifting frame, the left supporting edge 5-14 on the diamond lifting frame, the left gear 5-6 on the diamond lifting frame, the left rotating shaft 5-15 on the left gear 5-2 on the diamond lifting frame, the right rotating shaft 5-30 on the diamond lifting frame, the left rotating shaft 5-4 on the diamond lifting frame, the right rotating shaft 5-40 on the diamond lifting frame, namely the left rotating ring 5-150 on the diamond lifting frame is put into the left rotating ring 5-151 on the diamond lifting frame, the inner side of the left rotating ring 5-15 on the diamond lifting frame penetrates through the pull rod and the left bidirectional rotating shaft 5-15 on the supporting edge, the two sides of the left bidirectional rotating ring are clamped by the clamping ring, the left gear 5-6 on the diamond lifting frame is sleeved on the left rotating shaft 5-3 on the diamond lifting frame, the two sides of the left rotating shaft is clamped by the clamping ring, the left gear 5-2 on the left rotating shaft 5-4 on the lower side of the diamond lifting frame, the two sides of the left rotating ring is clamped by the clamping ring, the right rotating ring 5-30 on the two sides of the diamond lifting frame, the right rotating ring 5-20 on the two sides of the left rotating shaft 5-15 on the two sides of the diamond lifting frame is sleeved by the left rotating ring 5-15 on the left rotating shaft 5-15 on the two sides of the diamond lifting frame, the two sides of the left rotating ring, the left rotating ring 5-20 on the two sides of the left rotating shaft 10, the left rotating shaft and the left rotating shaft 10 is sleeved by the left rotating shaft, the left side of the left rotating shaft 5-11 is clamped by the left side, and the left rotating shaft, and the upper side is connected by the two side of the left rotating shaft 5-rotating shaft.
The left supporting edge 5-11 on the diamond-shaped lifting frame and the right supporting edge 5-12 on the diamond-shaped lifting frame and the left supporting edge 5-14 on the lower left supporting edge of the diamond-shaped lifting frame and the right supporting edge 5-13 on the lower right supporting edge of the diamond-shaped lifting frame are close to each other, then the pull screw rod 5-92 with the blocking protrusion removed is stretched into the threaded holes 5-93 of the pull rod and the left bidirectional rotating shaft 5-15 on the supporting edge along the head and continuously rotated, before entering the screw rod end sliding shaft sliding holes 5-94 of the pull rod and the right bidirectional rotating shaft 5-16 on the supporting edge, the left blocking protrusion 5-900 of the pull screw rod sliding shaft is screwed into a proper position, and then the pull screw rod 5-92 is continuously rotated so that the pull screw rod sliding shaft 5-91 stretches into the screw rod end sliding shaft sliding hole 5-94 of the right bidirectional rotating shaft 5-16 on the supporting edge to be exposed in a direct way, and the pull screw rod sliding shaft blocking protrusion 5-90 is arranged at the front end of the pull screw rod sliding shaft 5-91, as shown in figures 4, 12 and 14. Two ends of a sliding rod 6 at the upper end of the diamond-shaped lifting frame 5 are respectively extended into front and rear diamond-shaped sliding rod sliding grooves 8 under the rotating inclined plane sliding beam 9, sliding rod fixing screws 6-1 are respectively sleeved on the outer sides of the sliding rod sliding grooves 8 at the two ends of the sliding rod 6, and finally screw holes on the diamond-shaped lifting frame base 5-10 are aligned with screw holes on a right longitudinal beam 3 in the middle of the diamond-shaped lifting frame and a left longitudinal beam 4 in the middle of the diamond-shaped lifting frame, and are fixed by adopting four diamond-shaped lifting frame base fixing screws 5-00, as shown in figures 1, 2, 4 and 12.
1. Adjusting method of experimental instrument for accurately measuring friction coefficient of micro-motion inclined plane of diamond lifting frame
1. Firstly, holding a handle 5-9 of a tension screw of a diamond lifting frame by hands, rotating along the increasing direction of threads, gradually increasing the distance between a tension rod and a left bidirectional rotating shaft 5-15 of a supporting side and between the tension rod and a right bidirectional rotating shaft 5-16 of the supporting side under the action of pushing force of the tension screw 5-92 to two sides, lowering the diamond lifting frame 5, and tightly attaching a rotating inclined plane 10 to the upper surfaces of upper cross beams 7 of three rotating inclined plane brackets, namely the upper surfaces of front cross beams, rear cross beams and right cross beams, as shown in figure 1;
2. the lifting sleeves of the four leveling supporting legs 0 of the base are adjusted, the rotating inclined plane 10 is adjusted to be in a horizontal state, and initial readings alpha of a left (A window) vernier and a right (B window) vernier are respectively read 1 、β 1 As shown in fig. 1 and 17;
3. the material with dynamic friction coefficient and static friction coefficient to be measured is made into a plate shape with the same size as the rotary inclined plane 10 and the experimental plane 16, and is installed at a preset corresponding position, a round sliding block with the diameter of 50.00mm and the thickness of 10.00mm (the center of the round sliding block is provided with a pore) is manufactured, and the sliding block is placed at the preset position of the rotary inclined plane 10, as shown in fig. 20;
4. holding the rotary diamond lifting frame by hand, pulling the screw hand grab handle 5-9, rotating towards the direction of reducing the screw thread, reducing the distance between the pull rod and the left bidirectional rotating shaft 5-15 of the supporting side and the distance between the pull rod and the right bidirectional rotating shaft 5-16 of the supporting side, and approaching the left supporting side and the right supporting side, wherein the diamond lifting frame 5 is lifted, and in the process, the rotary inclined plane sliding beam 9 slides on the sliding rod 6, so that the inclination angle of the rotary inclined plane 10 is gradually increased, and finally, the rotary inclined plane end state is reached, as shown in fig. 3;
5. the round slide block of a certain material to be placed on the rotating inclined plane 10 slightly moves on the rotating inclined plane 10, and the sliding force of the gravity of the slide block along the inclined plane is equal to the maximum static friction force F of the mass block of the sliding material relative to the inclined plane i As shown in fig. 3, 20, 21;
6. the A, B window readings of the rotating inclined plane 10 rotated to a certain angle by the scale system 11 are respectively alpha 2 、β 2 The angle by which the rotary inclined surface 10 rotates (i.e., the inclination angle of the rotary inclined surface 10 relative to the horizontal plane) is
As shown in fig. 1, 3, 17;
7. in a specific experiment, the sliding rod 6 and the rotating inclined plane 10 are fixed into a whole by adopting the sliding rod fixing screw 6-1, as shown in fig. 3 and 13, so as to ensure the stability of the measuring device. Meanwhile, if the coefficient of dynamic friction is to be measured, the end of the rotating inclined plane 10 is required to be matched with the beginning of the experimental plane 16.
2. Principle of correcting eccentricity by using double cursors
As shown in fig. 19, since the center (geometric center) of the main scale of the instrument dial and the rotating spindle do not necessarily coincide completely (i.e. there is an eccentric difference), the error (instrument error) will always exist in the reading from a single micro scale during the rotation of the rotating inclined plane 10, and two vernier scales are designed and symmetrically installed for measuring the inclination angle of the rotating inclined plane, so that the instrument error caused by the eccentric difference can be corrected. Let O be the geometric center of the main scale and the main scale disk, O 1 If left and right vernier scales are used, the initial readings before rotation of the rotary inclined plane 10 are respectively theta Left 1 、θ Right 1 The end readings of the micro ruler when the rotating inclined plane 10 rotates to a certain inclination angle are respectively theta Left 2 、θ Right 2 The rotation angle of the rotation inclined surface 10 is
And (3) proving: as shown in FIG. 19, the center of the circle is O when the geometric center of the main scale disk is coincident with the center of the fixed rotation shaft at the lower end of the rotation inclined plane, and the center of the fixed rotation shaft at the lower end of the rotation inclined plane is O when the geometric center of the main scale disk is not coincident with the center of the fixed rotation shaft at the lower end of the rotation inclined plane 1 O is used for two diameters respectivelyAB and CD, cross O 1 As EF// AB and JH// CD, it can be seen that as long as the two centers are coincident, the reading AC arc length or BD arc length read by any vernier is error-free, if the two centers are not coincident, the reading is EJ arc length or HF arc length, the two arc lengths are inaccurate, EA arc length=fb arc length, JC arc length=hd arc length, then: AC arc length=bd arc length= (aj+jc) arc length= (df+fb) arc length= (aj+hd) arc length= (df+ea) arc length.
Therefore, the expression (1) holds. Namely, when the geometric center of the instrument dial main scale is not necessarily completely coincident with the fixed rotating shaft at the lower end of the rotating inclined plane, the rotating angle of the rotating inclined plane 10 around the fixed rotating shaft at the lower end can be accurately measured by adopting double vernier scale reading and (1) calculation.
3. Technical index
1. Rotational ramp 10 and experimental plane 16 dimensions: 500.0mm (L). Times.300.0 mm (B). Times.15.0 mm (H);
2. slider specification: manufacturing a circular sliding block with the diameter of 50.00mm (D) and the thickness of 10.00mm (h), flexibly designing the circular sliding block according to different specific measurement materials in actual measurement, wherein the thickness is generally 10.00-15.00 mm, and a clear mark is coated at the circular center of the circular sliding block so as to facilitate the convenient measurement of the positions of the initial sliding block and the final sliding block, and the standard quality of the circular sliding block is weighed out;
3. angular range: 0-58 degrees;
4. precision: 1'. 30 lattice arc length (alpha) of vernier 14.5° ) 29 grid arc length (. Beta.) with main scale 11-1 15° 0.5 deg.) is equal, i.e. the degree 30' (0.5 deg.) of 1 grid on the main scale 11-1 is allocated to 30 grids on the vernier, each grid on the vernier being 1', i.e. the accuracy of the reading system being 1', as shown in fig. 18.
4. Instance measurement of experiment instrument for accurately measuring friction coefficient of micro-motion inclined plane of diamond lifting frame
1. Firstly, a handle 5-9 of a tension screw of a rotary diamond lifting frame is held by a hand and rotated along the increasing direction of threads, under the action of the thrust force of the tension screw 5-92 to two sides, the distance between a tension rod and a left bidirectional rotating shaft 5-15 of a supporting side and the distance between the tension rod and a right bidirectional rotating shaft 5-16 of the supporting side are gradually increased, the diamond lifting frame 5 is lowered, and a rotary inclined plane 10 is clung to the upper surfaces of upper cross beams 7 of three rotary inclined plane brackets, as shown in figure 1;
2. the lifting sleeves of the four leveling supporting legs 0 of the base are adjusted, the rotating inclined plane 10 is adjusted to be in a horizontal state, and initial readings alpha of a left (A window) vernier and a right (B window) vernier are respectively read 1 、β 1 Alpha is respectively 1 ＝194°22′、β 1 =15° 30'; if the coefficient of dynamic friction is to be measured, the level of the experimental plane 16 is also adjusted, i.e. by adjusting the four experimental plane adjustable support legs 13 of the experimental plane 16. As shown in fig. 1 and 17;
3. manufacturing a material with dynamic friction coefficient and static friction coefficient to be tested into a plate shape with the same size as that of an experimental instrument, mounting the plate shape to a pre-designed corresponding position, manufacturing a round sliding block with the diameter of 50.00mm and the thickness of 10.00mm (the center of the round sliding block is provided with a pore), and placing the sliding block at a preset position on a rotating inclined plane 10;
4. the rotating diamond lifting frame is held by hand, the tension screw rod hand grab handle 5-9 rotates towards the direction of reducing the screw thread, under the action of the tension force of the threaded rod, the distance between the tension rod and the left bidirectional rotating shaft 5-15 of the supporting side and the distance between the tension rod and the right bidirectional rotating shaft 5-16 of the supporting side are reduced, the left supporting side and the right supporting side are close, the diamond lifting frame 5 is lifted, in the process, the rotating inclined plane sliding beam 9 slides on the sliding rod 6, the inclination angle of the rotating inclined plane 10 is gradually increased, finally, the experimental end state is reached, namely, the to-be-tested material sliding block just slightly moves along the rotating inclined plane 10, and the downward sliding force of the sliding block gravity along the inclined plane is equal to the maximum static friction force F of the sliding material mass block relative to the inclined plane i As shown in fig. 3 and 20;
5. the reading of the window A, B from the slope to a certain inclination (i.e. angle to horizontal) by the scale system 11 is alpha 2 ＝235°8′、β 2 By 5 deg. 17', the rotation angle of the rotation inclined plane 10 (i.e. the angle between the rotation inclined plane 10 and the horizontal plane) is
As shown in fig. 1, 3, 17, 20;
6. in a specific experiment, the sliding rod 6 and the rotating inclined plane 10 are fixed into a whole by adopting the sliding rod fixing screw 6-1, as shown in fig. 3 and 13, so as to ensure the stability of the measuring device. Meanwhile, if the coefficient of dynamic friction is to be measured, the end of the rotating inclined plane 10 is required to be in high coincidence with the beginning of the experimental plane 16, as shown in fig. 3;
7. when the experiment of specifically measuring the coefficient of dynamic friction force, the sliding block on the inclined plane can be manufactured into a round shape, and a pore vertical to the round surface is formed at the center of the round block, so that marks can be conveniently marked on the initial position and the final position of the movement stop when the experiment of the sliding block is adopted, and then the moving distance of the sliding block is measured by adopting a vernier caliper;
8. measuring the coefficient of static friction (mu) of the corresponding material s ) As shown in fig. 3 and 20;
9. measuring coefficient of kinetic friction (mu) of the corresponding material k ) As shown in fig. 3 and 21.
5. Mechanical analysis and formula derivation for actual measurement
(1) Measurement of coefficient of static friction
With this design equipment, the corresponding material is simply made to be the same size as the horizontal plane of the rotary inclined surface 10 and installed. The slide is sized appropriately and placed in the corresponding position of the bevel 10 to be turned. If the two surfaces of the sliding block and the contact place are static, a strong binding force-static friction force is formed between the two surfaces, and the surface can move relative to the other surface unless the binding force is broken, so that the binding force is broken-the ratio of the force before movement to the vertical force of the surface is called the static friction coefficient mu s If f s For static friction force, F 2 For vertical force, the breaking force is also the maximum force that causes the object to actuate, i.e., the maximum static friction force, expressed by the formula:
f s ＝μ s F 2 (1)
we can break up the slider on the rotating ramp 10 into a force component F along a direction parallel to the ramp 1 Component force F perpendicular to the inclined plane 2 I.e.
Fi＝mg sinα (2)
F j ＝mg sinα (3)
During the rotation of the inclined planeIf the slide block just slides down along the inclined plane, the inclined angle alpha of the inclined plane 0 Sliding force F at this time 1 (α 0 ) Just with static friction force f s The same, force on perpendicular to the bevel is F 2 (α 0 ) Is obtained by the following formula (1) and formula (2):
(2) Measurement of dynamic coefficient of friction
The rotary inclined plane 10 rotates to a certain angle alpha 1 Due to alpha 1 ＞α 0 The sliding block is placed at a certain position (l) of the inclined plane, and the sliding block starts to slide downwards at the position under the action of gravitational potential energy, moves to the bottom end of the inclined plane along the horizontal direction, is acted by sliding friction force in the whole movement process, has the direction opposite to the movement direction of the sliding block, and finally slides to the position s along the horizontal plane to be static. Set the sliding friction coefficient mu k At a position l (measured by a vernier caliper) away from the bottom of the inclined plane, the potential energy mgl sin alpha of the sliding block at the initial position 0 Work f of resistance force of slide block in inclined plane sliding process k l＝μ k F j0 ＝μ k mg cosα 0 The sliding block moves from the bottom of the inclined plane to the position s (measured by a vernier caliper), and the work mgs of the resistance is performed. According to the law of conservation of energy:
mglsinα 0 ＝μ k lmgcosα 0 +mgμ k s (5)
thereby obtaining the sliding friction coefficient of
μ k ＝l/(lcosα 0 +s)·sinα 0 (6)
Thus, it can also be demonstrated by the above measurement that the static friction coefficient is greater than the dynamic friction coefficient. I.e.
μ s ＞μ k (7)
(3) Cylindrical rigid body rolling application on inclined plane
Let the mass of the cylindrical rigid body be m, the radius be r, the moment of inertia around the central axis of the cylinder be J. The experiment is carried out by using an experiment instrument, and corresponding operation is carried out according to the steps, when the cylinder is purely rolled on the inclined plane, the translation of the mass center and the rotation and the movement around the mass center can be regarded as stress conditions, and the stress conditions are shown in figure 21.
From the law of mass motion and the law of rotation
mg sinθ-f＝ma (8)
fr＝Jβ (9)
And a c ＝β c r, wherein a c Translational acceleration, beta, of centroid c To obtain angular acceleration of rotation around the mass center
Let the length of the bevel be l. The speed and rolling time of the mass center when the cylinder rolls from the top to the bottom from the rest are
When cylinders with the same mass and radius and different rotational inertia do pure rolling from the same inclined plane, the acceleration obtained by the mass center, the speed when the mass center moves for the same distance and the required time are different, and the larger the rotational inertia J is, the smaller the acceleration of the mass center and the speed when the mass center moves for the same distance are, but the longer the time required for the movement for the same distance is.
6. Precision analysis of instance measurement of diamond lifting frame micro-motion inclined plane precision measurement friction coefficient experiment instrument
1. Precision analysis of coefficient of static friction
To (4) mu s ＝tanα 0 Differentiating to obtain mu' s ＝(sec 2 α 0 )α′ 0 . Let mu' s ＝Δμ s 、α′ 0 ＝Δα 0 The result of the experiment corresponds to the error of
Δμ s ＝(sec 2 α 0 )Δα 0 (13)
Wherein:
2. precision analysis of kinetic friction coefficient
For (6) mu k ＝l/(lcosα 0 +s)·sinα 0 Differentiation is carried out to obtain
Let mu' k ＝Δμ k ，α′ 0 ＝Δα 0 . The corresponding instrument error of the experimental result is
Wherein:
and l and s are constants.
3. Precision analysis of rolling friction coefficient
(1) Precision analysis of cylinder centroid velocity
Pair (11)
Differential->
Let v' 0 ＝Δv 0 The mass center speed error of the cylinder is that theta' =delta theta
(2) Precision analysis of cylinder centroid rolling time
Pair (12)
Differential->
Let t '=Δt, θ' =Δθ, then the cylinder rolling time error is
Wherein:
for a certain cylinder, l, m, r, J, g is constant.
The experimental instrument can ensure that the precision of the measured angle reaches 1' and the precision of the corresponding measured parameters reaches the precision reached by (13), (15), (16) and (17) when the static friction coefficient, the dynamic friction coefficient and the mass center speed and time of the cylinder are measured.
Claims (3)
1. An experimental instrument for accurately measuring friction coefficient of a micro-motion inclined plane of a diamond lifting frame, which is characterized in that: the experimental plane comprises a rotary inclined plane part and an experimental plane part, wherein the experimental plane part comprises an experimental plane adjustable supporting leg (13), an experimental plane lower cross beam (14), an experimental plane vertical rod (15) and an experimental plane (16); the rotary inclined plane part comprises leveling supporting legs (0), a rotary inclined plane bracket vertical supporting rod (1), a rotary inclined plane bracket lower cross beam (2), a right longitudinal beam (3) in the middle of a diamond lifting frame, a left longitudinal beam (4) in the middle of the diamond lifting frame, a rotary inclined plane bracket upper cross beam (7), a diamond lifting frame (5), a sliding rod (6), a sliding rod sliding groove (8), a rotary inclined plane sliding beam (9), a rotary inclined plane (10) and a scale system (11);
the left rotating shaft sleeve fixed end (12-120) of the left rotating shaft sleeve (12-12) is welded at the left side position on the front surface (7-1) of the right cross beam of the rotating inclined plane, the left rotating shaft (12-2) penetrates into the left rotating shaft sleeve (12-12) and the left rotating shaft fixed end (12-21) is welded at the left side position of the front end surface of the rotating inclined plane (10); the right rotating shaft sleeve fixed end (12-110) of the right rotating shaft sleeve (12-11) is welded at the right side position on the front surface (7-1) of the right cross beam of the rotating inclined plane, the right rotating shaft (12-1) penetrates into the right rotating shaft sleeve (12-11), a vernier disc seat (12-0) of the vernier system (11) is sleeved on the right rotating shaft (12-1), and the right rotating shaft fixed end (12-10) of the right rotating shaft (12-1) is welded at the corresponding position on the right side surface of the rotating inclined plane (10);
the supporting edges of the diamond lifting frames (5) are U-shaped, and the two side surfaces of one end of the upper left supporting edge (5-150), the lower left supporting edge (5-151), the upper right supporting edge (5-160) and the lower right supporting edge (5-161) of the diamond lifting frames are respectively punched with the upper left supporting edge rotating ring (5-150), the lower left supporting edge rotating ring (5-151), the upper right supporting edge rotating ring (5-160) and the lower right supporting edge rotating ring (5-161); the upper left support edge (5-11), the lower left support edge (5-14), the upper right support edge (5-12) and the other end of the lower right support edge (5-13) are symmetrically and fixedly connected with an upper left gear (5-6), a lower left gear (5-2), an upper right gear (5-60) and a lower right gear (5-20) of the diamond lifting frame, and are punched with an upper left rotating ring (5-31) and an upper right rotating ring (5-301) of the diamond lifting frame, which correspond to an upper left rotating shaft (5-3) and an upper right rotating shaft (5-30) of the diamond lifting frame, and a lower left rotating ring (5-41) and a lower right rotating ring (5-401) of the diamond lifting frame, which correspond to the lower left rotating shaft (5-4) and the lower right rotating shaft (5-40) of the diamond lifting frame;
the tension screw (5-92) passes through screw holes (5-93) of the tension screw and the left bidirectional rotating shaft (5-15) on the supporting side in a threaded manner, after the front end of the tension screw (5-92) is sleeved with a left blocking boss (5-900) of the tension screw sliding shaft to a corresponding position, the tension screw sliding shaft (5-91) at the end part of the tension screw (5-92) stretches into a screw end sliding shaft sliding hole (5-94) of the tension screw and the right bidirectional rotating shaft (5-16) on the supporting side to be exposed in a direct manner, and a blocking boss (5-90) at the end part of the tension screw sliding shaft is arranged at the front end of the tension screw sliding shaft (5-91);
the right rotating shaft (12-1), the vernier disc seat (12-0), the vernier disc (11-2) and the main scale (11-1) are comprehensively positioned, and the positioning center is the position of a central shaft (12) of the scale system; the right rotating shaft (12-1) is coaxial with the left rotating shaft (12-2); the main scale chassis is screwed and reinforced at the corresponding position of the upper cross beam (7) of the rotary inclined plane bracket and the right side surface of the vertical supporting rod (1) of the rotary inclined plane bracket; the vernier disc base (12-0) is in counterpoint welding with the right rotating shaft (12-1), the vernier disc (11-2) is in counterpoint fixing by adopting a vernier disc fixing screw (11-0), and the left vernier (11-21), the right vernier (11-22) and the main scale (11-1) are on the same horizontal plane;
the width of the left supporting edge (5-11) on the diamond lifting frame, the width of the right supporting edge (5-12) on the diamond lifting frame are smaller than the width of the left supporting edge (5-14) under the diamond lifting frame, the width of the right supporting edge (5-13) under the diamond lifting frame, the width of the left supporting edge (5-11) on the diamond lifting frame, the width of the right supporting edge (5-12) on the diamond lifting frame are sleeved in the left supporting edge (5-14) under the diamond lifting frame, and the width of the right supporting edge (5-13) under the diamond lifting frame.
2. The experimental instrument for accurately measuring friction coefficient of a micro-motion inclined plane of a diamond-shaped lifting frame according to claim 1, wherein the experimental instrument is characterized in that: the left support side rotary ferrule (5-150) on the diamond-shaped lifting frame is correspondingly placed into the inner side of the left support side rotary ferrule (5-151) under the diamond-shaped lifting frame, a tension rod penetrates through the left bidirectional rotary shaft (5-15) on the support side, two sides of the rotary shaft are clamped by adopting clamping rings, the left gear (5-6) on the diamond-shaped lifting frame is sleeved on the left rotary shaft (5-3) on the diamond-shaped lifting frame, two sides of the rotary shaft are clamped by adopting the clamping rings, and the left gear (5-2) under the diamond-shaped lifting frame is sleeved on the left rotary shaft (5-4) under the diamond-shaped lifting frame, and two sides of the rotary shaft are clamped by adopting the clamping rings; the right supporting side rotating ferrule (5-160) on the diamond lifting frame is correspondingly placed into the inner side of the right supporting side rotating ferrule (5-161) under the diamond lifting frame, a tension rod penetrates through the right bidirectional rotating shaft (5-16) on the supporting side, clamping rings are adopted on two sides of the right bidirectional rotating shaft, the right gear (5-60) on the diamond lifting frame is sleeved on the right rotating shaft (5-30) on the diamond lifting frame, clamping rings are adopted on two sides of the right gear (5-20) on the right rotating shaft (5-40) under the diamond lifting frame, and clamping rings are adopted on two sides of the right gear.
3. The experimental instrument for accurately measuring friction coefficient of a micro-motion inclined plane of a diamond-shaped lifting frame according to claim 1, wherein the experimental instrument is characterized in that: two ends of a sliding rod (6) at the upper end of a diamond lifting frame (5) are respectively extended into front and rear diamond sliding rod sliding grooves (8) under a rotating inclined plane sliding beam (9), sliding rod fixing screws (6-1) are respectively sleeved on the outer sides of the sliding rod sliding grooves (8) at the two ends of the sliding rod (6), screw holes on a base (5-10) of the diamond lifting frame are fixed with a right longitudinal beam (3) in the middle of the diamond lifting frame and screw holes on a left longitudinal beam (4) in the middle of the diamond lifting frame in an aligning mode through diamond lifting frame base fixing screws (5-00).
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| CN204413984U (en) * | 2015-01-27 | 2015-06-24 | 莱芜钢铁集团有限公司 | Instrument changed by servo actuator |
| CN105737869A (en) * | 2014-12-11 | 2016-07-06 | 西安博昱新能源有限公司 | Lifting mechanism for testing system |
| CN206029813U (en) * | 2016-08-31 | 2017-03-22 | 丁加文 | Accurate auto -lock lift platform |
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| CN2391193Y (en) * | 1999-10-21 | 2000-08-09 | 山西大学 | Frictionmeter |
| JP2007333637A (en) * | 2006-06-16 | 2007-12-27 | East Japan Railway Co | Portable rail friction coefficient measuring unit |
| US8997551B2 (en) * | 2012-09-05 | 2015-04-07 | Kuwait University | Apparatus for determining coefficients of friction |
| CN103400522B (en) * | 2013-07-31 | 2015-12-02 | 浙江大学城市学院 | Quiet dynamic and right cylinder rolling friction force coefficient experiment instrument is measured on high precision fine tuning inclined-plane |
| CN206075642U (en) * | 2016-08-18 | 2017-04-05 | 浙江大学城市学院 | Chute-type three-dimensional regulation quantitative verification Double cone up rolling condition experiment instrument |
| CN208737737U (en) * | 2018-02-02 | 2019-04-12 | 浙江大学城市学院 | Diamond shape crane fine motion inclined-plane precise measurement friction coefficient experiment instrument |
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| CN105737869A (en) * | 2014-12-11 | 2016-07-06 | 西安博昱新能源有限公司 | Lifting mechanism for testing system |
| CN204413984U (en) * | 2015-01-27 | 2015-06-24 | 莱芜钢铁集团有限公司 | Instrument changed by servo actuator |
| CN206029813U (en) * | 2016-08-31 | 2017-03-22 | 丁加文 | Accurate auto -lock lift platform |
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