CN104050865B - A kind of eccentric fixture instructional device - Google Patents
A kind of eccentric fixture instructional device Download PDFInfo
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- CN104050865B CN104050865B CN201410282771.4A CN201410282771A CN104050865B CN 104050865 B CN104050865 B CN 104050865B CN 201410282771 A CN201410282771 A CN 201410282771A CN 104050865 B CN104050865 B CN 104050865B
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- eccentric
- plane
- briquetting
- fixed mount
- drawing board
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Abstract
The invention provides a kind of eccentric fixture instructional device, the eccentric clamping unit, track drawing unit and the inclined-plane that at least comprise base and be arranged on base are from lock unit, and described eccentric clamping unit at least comprises eccentric circular shaft, off-centre operation, fixed mount, briquetting, rolling bearing units and sliding axle; Described track drawing unit at least comprises gear, tooth bar, slide rail, movable stand and drawing board, paintbrush, and slide rail is provided with two; Be connected by shaft coupling between described gear shaft with eccentric circular shaft, and be provided with clutch coupling between diaxon; Described inclined-plane comprises inclined-plane, counterweight block and leading screw from lock unit, and the top of leading screw withstands in the slideway of inclined-plane reverse side, can the degree of tilt of adjustable inclined surface apparatus by adjusting screw height.Device provided by the invention can help teacher thoroughly to explain clamping process and the self-lock mechanism of eccentric fixture, avoids the uninteresting jerky of theory deduction, but also can the manipulative ability of training student and interest.
Description
Technical field
The invention provides a kind of eccentric fixture instructional device, for providing eccentric fixture principle analysis for jig Design course teaching, belonging to technical field of mechanical automation.
Background technology
In mechanical major teaching process, clamp system is seen everywhere, and jig Design is the core curriculum of Machine Design always, and in modern society's machinery production, fixture has very important status especially.Fixture principle is the basis of Machine Design, the course related to has " Technology of Mechanical Manufacture ", " Machine Tool Fixture Design " and the design of mechanical major course, it is the emphasis of mechanical major undergraduate course, and the eccentric fixture in fixture is widely used in Machine Tool design, but for the clamping principle of eccentric circle clamp, without enough understanding, the content that physiology solution is more difficult, this is a gaps and omissions of fixture theory teaching to a lot of university student.
Nowadays common fixture instructional device, major part is only copy everything mechanically on classroom by clamp device, demonstrate clamp operation process, can only show to student how can clamping workpiece, but what cannot be interpreted as can clamp, more cannot derive clamping conditions or inspire student to think deeply how design effectively fixture, this is the heavy difficult point of mechanical major teaching.Reflect according to machinery system undergraduate, in fixture principle the self-lock mechanism of eccentric fixture and design criteria the most hard to understand, the especially critical condition of self-locking of eccentric fixture
the heavy difficult point of course especially, student is difficult to itself and plain inclined-plane self-locking equity, self-lock mechanism inherently Approximate Equivalent in fact both.
In order to the clamping process and the self-lock mechanism that help teacher thoroughly to explain eccentric fixture, avoid the uninteresting jerky of theory deduction, therefore be necessary to devise a set of eccentric fixture teaching appliance, eccentric fixture principle analysis is made to become vivid and interesting, compensate for a vacancy in jig Design teaching, allow student in experimental implementation, explore eccentric self-locking condition, thus deepen the understanding to eccentric fixture.
Summary of the invention
The invention provides a kind of eccentric fixture instructional device, which solves the deficiency in background technology, this device can help teacher thoroughly to explain clamping process and the self-lock mechanism of eccentric fixture, avoids the uninteresting jerky of theory deduction, but also can the manipulative ability of training student and interest.
Realizing the technical scheme that above-mentioned purpose of the present invention adopts is:
A kind of eccentric fixture instructional device, at least comprise base and be arranged on the eccentric clamping unit on base, track drawing unit and inclined-plane are from lock unit, described eccentric clamping unit at least comprises eccentric circular shaft, off-centre operation, fixed mount, briquetting, rolling bearing units and sliding axle, described fixed mount and rolling bearing units are all fixed on base, fixed mount is door font, eccentric circular shaft level is arranged in rolling bearing units, off-centre operation is fixed on one end of eccentric circular shaft, and it is in the same plane with fixed mount, briquetting to be arranged on fixed mount by sliding axle and can to slide up and down along fixed mount, the bottom of sliding axle is fixedly connected with briquetting, briquetting is provided with mounting hole, the slide opening at fixed mount top is passed on the top of sliding axle, the dual-side of fixed mount is equipped with vertical chute, the bottom of sliding axle is fixed with crossbeam, the two ends of described crossbeam are all arranged in chute and crossbeam can slide up and down along chute, described briquetting is positioned at the top of off-centre operation, and contacts between the two, described track drawing unit at least comprises gear, tooth bar, slide rail, movable stand and drawing board, paintbrush, slide rail is provided with two, two slide rails parallel and lay respectively at the left and right sides of eccentric clamping unit, tooth bar is installed on wherein on a slide rail, drawing board is vertically arranged on another slide rail, movable stand is arranged between tooth bar and drawing board, both are fixedly connected with, tooth bar and drawing board are along slide rail synchronous slide, one end of described paintbrush is installed in the mounting hole on briquetting, the other end of paintbrush contacts with drawing board, described gear is arranged on the top of tooth bar by rolling bearing units and engages with tooth bar, be connected by shaft coupling between described gear shaft with eccentric circular shaft, and be provided with clutch coupling between diaxon, described inclined-plane comprises inclined-plane, counterweight block and leading screw from lock unit, wherein the one end on inclined-plane is arranged on base by hinge, the tow sides on inclined-plane are equipped with slideway, counterweight block is positioned in the slideway in front, inclined-plane, leading screw to be arranged on base and to be positioned at the below on inclined-plane, the top of leading screw withstands in the slideway of inclined-plane reverse side, can the degree of tilt of adjustable inclined surface apparatus by adjusting screw height.
Described off-centre operation forms by justifying wheel, slide block and lock-screw, and circle wheel has chute along radial direction, and slide block is embedded in chute, and slider locking is fixed on circle wheel by lock-screw, and described eccentric circular shaft is fixedly connected with slide block.
On described sliding axle, cover has spring, and described spring is between briquetting and the top of fixed mount.
Described drawing board is glass drawing board, and paintbrush is the water-based paintbrush of erasable, and glass drawing board is also accompanied with angle gauging tool.
The slideway in front, described inclined-plane is identical with the roughness on off-centre operation surface, and counterweight block surface is identical with the roughness on briquetting surface, and the friction factor between slideway with counterweight block is equal with the friction factor between off-centre operation and briquetting.
Compared with prior art, the present invention has the following advantages: 1, in the present invention, off-centre operation forms by justifying wheel, slide block and lock-screw, and circle wheel has chute along radial direction, and slide block is embedded in chute, therefore the eccentric throw of off-centre operation can regulate, and can realize the exploration of critical eccentricity.2, because eccentric circular shaft and gear shaft need disconnection in the debugging eccentric throw stage, and synchronous axial system is needed again in the track drafting stage, so place adopts electromagnetic clutch to connect diaxon control its disconnected conjunction, easy-to-operate.3, also adopt gear synchronous technology that eccentric profile is launched into coordinate diagram in the present invention, inspire student think deeply eccentric clamping and wedge clamp between contact.4, in the present invention, drawing board is glass drawing board; paintbrush is the water-based paintbrush of erasable; glass drawing board is also accompanied with angle gauging tool; student not only can be allowed directly to observe track drawing process; analyze track characteristic; also be convenient to the mapping of wiping repeatedly, glass drawing board and inclined-plane all have angle gauging tool, angle reads very clear simultaneously.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of eccentric fixture instructional device provided by the invention;
Fig. 2 is the structural representation of eccentric clamping unit;
Fig. 3 is the structural representation of track drawing unit;
Fig. 4 is the structural representation of inclined-plane from lock unit;
Fig. 5 is the eccentric fixture schematic diagram of the embodiment of the present invention;
Fig. 6 is the experiment flow figure of the embodiment of the present invention;
In figure: the eccentric circular shaft of 1-, 2-off-centre operation, 3-fixed mount, 4-briquetting, 5-rolling bearing units, 6-sliding axle, 7-base, 8-crossbeam, 9-spring, 10-gear, 11-tooth bar, 12-slide rail, 13-movable stand, 14-drawing board, 15-gear shaft, 16-clutch coupling, 17-inclined-plane, 18-counterweight block, 19-hinge, 20-leading screw.
Embodiment
Do detailed specific description below in conjunction with accompanying drawing to the present invention, protection scope of the present invention is not limited to following examples.
The one-piece construction schematic diagram of eccentric fixture instructional device provided by the invention as shown in Figure 1, comprise base 7 and the eccentric clamping unit, track drawing unit and the inclined-plane that are arranged on base from lock unit.
The structure of described eccentric clamping unit as shown in Figure 2, comprise eccentric circular shaft 1, off-centre operation 2, fixed mount 3, briquetting 4, rolling bearing units 5 and sliding axle 6, described fixed mount 6 and rolling bearing units 5 are all fixed on base, fixed mount is door font, eccentric circular shaft 1 level is arranged in rolling bearing units, off-centre operation 2 is fixed on one end of eccentric circular shaft 1, and it is in the same plane with fixed mount 3, described off-centre operation 2 is by circle wheel, slide block and lock-screw composition, circle wheel has chute along radial direction, slide block is embedded in chute, slider locking is fixed on circle wheel by lock-screw, described eccentric circular shaft 1 is fixedly connected with slide block.Owing to adopting said structure, therefore the eccentric throw of off-centre operation can regulate, and can realize the exploration of critical eccentricity.
Briquetting 4 to be arranged on fixed mount 3 by sliding axle 6 and can to slide up and down along fixed mount 3, the bottom of sliding axle 6 is fixedly connected with briquetting 4, briquetting 4 is provided with mounting hole, the slide opening at fixed mount 3 top is passed on the top of sliding axle 6, on described sliding axle 6, cover has spring 9, and described spring 9 is between briquetting and the top of fixed mount.The dual-side of fixed mount is equipped with vertical chute, and the bottom of sliding axle is fixed with crossbeam 8, and the two ends of described crossbeam 8 are all arranged in chute and crossbeam 8 can slide up and down along chute; Described briquetting 4 is positioned at the top of off-centre operation 2, and contacts between the two.Described sliding axle, spring and crossbeam can the vertical direction stable movement of spring smooth, do not occur crooked, reverse.
The structure of described track drawing unit as shown in Figure 3, comprise gear 10, tooth bar 11, slide rail 12, movable stand 13 and drawing board 14, paintbrush, slide rail 12 is provided with two, two slide rails 12 parallel and lay respectively at the left and right sides of eccentric clamping unit, tooth bar 11 is installed on wherein on a slide rail, drawing board 14 is vertically arranged on another slide rail, movable stand 13 is arranged between tooth bar 11 and drawing board 14, both are fixedly connected with, tooth bar 11 and drawing board 14 are along slide rail synchronous slide, one end of described paintbrush is installed in the mounting hole on briquetting 4, pass through screw lock, the other end of paintbrush contacts with drawing board 14, described gear 10 is arranged on the top of tooth bar 11 by rolling bearing units 5 and engages with tooth bar 11, be connected by shaft coupling between described gear shaft 15 with eccentric circular shaft 1, and between diaxon, be provided with clutch coupling 16.
In the present invention, drawing board 14 is glass drawing board; paintbrush is the water-based paintbrush of erasable; glass drawing board is also accompanied with angle gauging tool; student not only can be allowed directly to observe track drawing process; analyze track characteristic; also be convenient to the mapping of wiping repeatedly, glass drawing board and inclined-plane all have angle gauging tool, angle reads very clear simultaneously.
Described inclined-plane from the structure of lock unit as described in Figure 4, comprise inclined-plane 17, counterweight block 18 and leading screw 20, wherein the one end on inclined-plane 17 is arranged on base 7 by hinge 19, the tow sides on inclined-plane 17 are equipped with slideway, counterweight block 18 is positioned in the slideway in front, inclined-plane, leading screw 20 to be arranged on base 7 and to be positioned at the below on inclined-plane 17, and the top of leading screw 20 withstands in the slideway of inclined-plane reverse side, can the degree of tilt of adjustable inclined surface apparatus by adjusting screw height.The slideway in front, described inclined-plane is identical with the roughness on off-centre operation surface, and counterweight block surface is identical with the roughness on briquetting surface, and the friction factor between slideway with counterweight block is equal with the friction factor between off-centre operation and briquetting.
Below the principle of the eccentric fixture instructional device that the present embodiment provides is described in detail:
As shown in Figure 5, in the eccentric wheel shown in Fig. 5, its geometric center is C to the eccentric fixture schematic diagram that the present embodiment provides, and diameter is d, and the centre of gyration is O, and eccentric throw is e.As seen from the figure, this eccentric train eccentric basic circle that is r by radius and two cover arc wedge MNK are thereon formed.If control handle is contained in the first half, just work can be carried out with the arc wedge of Lower Half.When eccentric wheel turns round around O clockwise, the distance (i.e. turning radius r) its centre of gyration to eccentric wheel compressed a little constantly increases, be equivalent to this arc wedge forward wedging between eccentric basic circle and workpiece, thus by Work-sheet pressing.
Eccentric wheel clamping is actually the one distortion of wedge clamping, compared with clamping with plane wedge, the key distinction is the lift angle α of each clamping point on its working surface is a parameter, when the point that slippage the most easily occurs is revolution 90 °, this point is the stationary point of " s " shape track, and tangent line inclination angle is maximum, therefore should with this point for decision criteria when the complete condition of self-locking of consideration eccentric fixture, the lift angle α of this point
max, must α be met
max≤ μ, wherein μ is the angle of friction between off-centre operation and workpiece, only relevant with surface both material.Further derivation:
Contrast bevel friction condition of self-locking α≤μ, difference is only that α is a parameter herein, and therefore the two can equivalence.
Can obtain off-centre operation condition of self-locking thus, this is also the core value of eccentric fixture design.Can find out, whether eccentric fixture self-locking has nothing to do with clamping force size, only relevant with surface of contact angle of friction, off-centre operation eccentric throw and diameter.The fastening of off-centre operation clamps similar to wedge, and its condition of self-locking is consistent with inclined-plane condition of self-locking, is surface of contact friction self-locking, the essence of Here it is eccentric fixture.Particularly, off-centre operation does not reach showing as of condition of self-locking, in stationary point, resilience and slippage occurs.
Object in the present embodiment is namely in order to verify above-mentioned inference, in the present embodiment, experimental implementation flow process as shown in Figure 6, first be find critical eccentricity, concrete operations disconnect clutch, adopt dichotomy constantly to adjust eccentric distance e, then stir off-centre operation to 90 ° of positions, until off-centre operation just resilience does not occur when half-twist position;
Then draw eccentric profile stretch-out view during critical self-locking, concrete operations are closed clutch couplinges, install paintbrush, utilize handle that gear is shaken opposite side from tooth bar side;
Then adjust inclination angle of inclined plane and reach critical friction self-locking, concrete operations are rotating threaded shaft nuts, until counterweight static on inclined-plane just starts to slide soon.
Finally contrast the maximum lift angle α of critical eccentric wheel profile
maxwith inclined-plane critical friction Self-locking angle α, can reach a conclusion.
Claims (5)
1. an eccentric fixture instructional device, it is characterized in that: at least comprise base and be arranged on the eccentric clamping unit on base, track drawing unit and inclined-plane are from lock unit, described eccentric clamping unit at least comprises eccentric circular shaft, off-centre operation, fixed mount, briquetting, rolling bearing units and sliding axle, described fixed mount and rolling bearing units are all fixed on base, fixed mount is door font, eccentric circular shaft level is arranged in rolling bearing units, off-centre operation is fixed on one end of eccentric circular shaft, and it is in the same plane with fixed mount, briquetting to be arranged on fixed mount by sliding axle and can to slide up and down along fixed mount, the bottom of sliding axle is fixedly connected with briquetting, briquetting is provided with mounting hole, the slide opening at fixed mount top is passed on the top of sliding axle, the dual-side of fixed mount is equipped with vertical chute, the bottom of sliding axle is fixed with crossbeam, the two ends of described crossbeam are all arranged in chute and crossbeam can slide up and down along chute, described briquetting is positioned at the top of off-centre operation, and contacts between the two, described track drawing unit at least comprises gear, tooth bar, slide rail, movable stand and drawing board, paintbrush, slide rail is provided with two, two slide rails parallel and lay respectively at the left and right sides of eccentric clamping unit, tooth bar is installed on wherein on a slide rail, drawing board is vertically arranged on another slide rail, movable stand is arranged between tooth bar and drawing board, both are fixedly connected with, tooth bar and drawing board are along slide rail synchronous slide, one end of described paintbrush is installed in the mounting hole on briquetting, the other end of paintbrush contacts with drawing board, described gear is arranged on the top of tooth bar by rolling bearing units and engages with tooth bar, the axle of described gear is connected by shaft coupling with between eccentric circular shaft, and is provided with clutch coupling between diaxon, described inclined-plane comprises inclined-plane, counterweight block and leading screw from lock unit, wherein the one end on inclined-plane is arranged on base by hinge, the tow sides on inclined-plane are equipped with slideway, counterweight block is positioned in the slideway in front, inclined-plane, leading screw to be arranged on base and to be positioned at the below on inclined-plane, the top of leading screw withstands in the slideway of inclined-plane reverse side, can the degree of tilt of adjustable inclined surface apparatus by adjusting screw height.
2. eccentric fixture instructional device according to claim 1, it is characterized in that: described off-centre operation forms by justifying wheel, slide block and lock-screw, circle wheel has chute along radial direction, slide block is embedded in chute, slider locking is fixed on circle wheel by lock-screw, and described eccentric circular shaft is fixedly connected with slide block.
3. eccentric fixture instructional device according to claim 1, is characterized in that: on described sliding axle, cover has spring, and described spring is between briquetting and the top of fixed mount.
4. eccentric fixture instructional device according to claim 1, is characterized in that: described drawing board is glass drawing board, and paintbrush is the water-based paintbrush of erasable, and glass drawing board is also accompanied with angle gauging tool.
5. eccentric fixture instructional device according to claim 1, it is characterized in that: the slideway in front, described inclined-plane is identical with the roughness on off-centre operation surface, counterweight block surface is identical with the roughness on briquetting surface, and the friction factor between slideway with counterweight block is equal with the friction factor between off-centre operation and briquetting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410282771.4A CN104050865B (en) | 2014-06-23 | 2014-06-23 | A kind of eccentric fixture instructional device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410282771.4A CN104050865B (en) | 2014-06-23 | 2014-06-23 | A kind of eccentric fixture instructional device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104050865A CN104050865A (en) | 2014-09-17 |
| CN104050865B true CN104050865B (en) | 2016-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410282771.4A Expired - Fee Related CN104050865B (en) | 2014-06-23 | 2014-06-23 | A kind of eccentric fixture instructional device |
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| CN (1) | CN104050865B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104476603A (en) * | 2014-12-07 | 2015-04-01 | 遵义市宝海农用物资研发有限公司 | Clamping device for polyfoam cutting |
| CN110379286B (en) * | 2019-07-22 | 2021-03-16 | 焦作师范高等专科学校 | Mechanism motion model suitable for teaching |
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| CN201186390Y (en) * | 2008-02-29 | 2009-01-28 | 河南省西峡汽车水泵股份有限公司 | Eccentric jig |
| JP2009098405A (en) * | 2007-10-17 | 2009-05-07 | Kayaba System Machinery Kk | Earthquake generating car |
| DE102008046696A1 (en) * | 2008-09-10 | 2010-04-08 | Safemaster Gmbh | Device for reduction of lateral moving forces in motor vehicles for driver training, has clamping system, where guide roller is pivoted at clamping system around steering axis |
| CN201583448U (en) * | 2010-01-15 | 2010-09-15 | 安徽农业大学 | Clamping structure of eccentric tensile test |
| CN203338661U (en) * | 2013-07-10 | 2013-12-11 | 新乡职业技术学院 | Clamp for industrial robot teaching |
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| CN203636835U (en) * | 2013-12-27 | 2014-06-11 | 新乡职业技术学院 | Multifunctional clamp used for industrial robot teaching |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7972139B2 (en) * | 2009-01-27 | 2011-07-05 | Staub Gregg W | Training device for forcibly opening a locked door |
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2014
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| JP2009098405A (en) * | 2007-10-17 | 2009-05-07 | Kayaba System Machinery Kk | Earthquake generating car |
| CN201186390Y (en) * | 2008-02-29 | 2009-01-28 | 河南省西峡汽车水泵股份有限公司 | Eccentric jig |
| DE102008046696A1 (en) * | 2008-09-10 | 2010-04-08 | Safemaster Gmbh | Device for reduction of lateral moving forces in motor vehicles for driver training, has clamping system, where guide roller is pivoted at clamping system around steering axis |
| CN201583448U (en) * | 2010-01-15 | 2010-09-15 | 安徽农业大学 | Clamping structure of eccentric tensile test |
| CN203338661U (en) * | 2013-07-10 | 2013-12-11 | 新乡职业技术学院 | Clamp for industrial robot teaching |
| CN203459861U (en) * | 2013-09-17 | 2014-03-05 | 安徽三兴检测有限公司 | Clamp for fixing multi-specification test piece, allowing multiple positions to be welded, and allowing two persons to weld simultaneously |
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| 《浅谈车偏心工件的实习教学》;谢文石;《信息科技》;20101231(第19期);第299-300页 * |
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| CN104050865A (en) | 2014-09-17 |
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