CN105206170A - Motion analysis platform for cam follower - Google Patents

Abstract

The invention discloses a cam follower motion analysis platform, which includes a cam conversion lever group mechanism arranged on the general support, a paper feeding mechanism, a transmission mechanism, and a paper feeding backing plate on the paper feeding mechanism. Paper shaft, the paper feeding shaft is provided with a paper feeding wheel; the paper feeding wheel bites up and down in the paper feeding wheel hole; the gear reducer in the transmission mechanism is connected to the cantilever shaft; the cantilever shaft is connected to the cam shaft through a bevel gear transmission mechanism; the cam shaft There is a cam on the top; the cantilever shaft is connected to the paper feed shaft through the synchronous pulley mechanism; the swing rods in the cam conversion rod group mechanism are hinged to form an X shape; the telescopic rod is on the outer circumference of the cam; the pen holder is connected to the pen holder; Swing bar; Pen cap is connected with drawing pen. The invention uses the chord method combined with the principle of similar triangles to realize continuous and accurate drawing of cam displacement diagrams, velocity diagrams and acceleration diagrams through a lever mechanism, which can deepen students' understanding of mechanical structures and cams, improve learning efficiency, and improve teaching quality.

Description

A cam follower motion analysis platform

technical field

The invention relates to the technical field of teaching aids, in particular to a cam follower motion analysis platform.

Background technique

The basic feature of the cam mechanism is that as long as the appropriate cam profile is made, the follower can realize various complex movements (including linear, swing, constant velocity and non-uniform velocity movement), and the structure is simple and compact, occupying a small space, and the design is relatively convenient. In recent years, with the application of computer and numerical control processing technology, the manufacture of cams and the design of cam mechanisms have undergone revolutionary changes. There are more and more cam mechanisms and their applications are becoming more and more extensive. They have become an important transmission mechanism. At the same time, my country has made great progress both in the theory and application research of cam mechanism and in the product development and manufacture of cam mechanism. Although our country has reached the world's advanced level in terms of theoretical research, there is still a certain gap between our country and developed countries in terms of cam manufacturing. high. Therefore, the teaching of the cam is particularly important.

In the teaching of the cam mechanism, theoretically, its movements are relatively abstract, and students cannot truly and clearly see its movement trajectory during class, and can only describe its laws abstractly based on existing knowledge and thinking. There are two methods for the design of the existing cam mechanism: analytical method and graphic method. Although the analytical method can carry out accurate design and accurately calculate the radial size of each point on the cam contour line, it is not intuitive, and it is especially difficult for students who are not good at mathematics. Although the graphic method is intuitive and easy to be accepted by students, but the drawing error is relatively large, and it is only suitable for places where the requirements for the follower are not too strict. For cams with high precision requirements, the graphical rule is not suitable. The transmission of the cam mechanism in the teaching has become the focus and difficulty.

Through patent search, there are the following known prior art solutions:

Patent 1:

Application number: 201420287189.2, application date: 2014-05-30, public announcement date: 2014-10-01, the invention belongs to the technical field of teaching aids, and discloses a multi-degree-of-freedom cam teaching device, including a base plate, a bracket, and an input shaft , the multi-degree-of-freedom cam teaching device is formed through the transmission between multiple specific gears, which can actually demonstrate the process of generating a stroke curve by acting on the cam with a pointed push rod, a flat bottom push rod, and a pendulum rod. The drawing of the travel curve can be stopped at any time by manual mode and the curve analysis can be performed; the eccentricity can be changed to compare the differences and causes of multiple curves, and the operation is free and flexible; the device can also draw the cam through the travel curve to understand the generation process of the cam, so that Students can more intuitively understand the principle of cam design by inversion method. The device can be used not only as classroom teaching demonstration but also as experimental equipment for students; it can not only improve the students' hands-on operation ability, but also analyze the corresponding relationship between the cam and the stroke curve at any time, so as to improve the students' interest in learning.

Patent 2:

Application number: 201420195809.X, application date: 2014-04-21, public announcement date: 2014-10-29, the invention provides a cam teaching device, including a base plate, an execution module and an acceleration module. The executive module includes a fixed plate, a first transmission member, a drawing board, a cam, a polished rod, a pusher and a first paintbrush. The fixing plate is movably fixed on the base plate. The first transmission part drives the cam and the drawing board to move. During the movement, the cam and the drawing board contact the pusher to drive the pusher to move up and down. The movement of the pusher drives the first paintbrush to move, thereby drawing the motion curve of the cam. On the contrary, according to the motion curve of the cam, the pusher draws the outline of the cam on the drawing board. The acceleration module includes a flat panel, a control circuit, a second transmission member, a second paintbrush holder and a second paintbrush. The flat plate is movably fixed on the base plate. The control circuit detects the moving speed of the polished rod in real time, and controls the second transmission part through the detection, so as to drive the second paintbrush to draw the acceleration curve of the cam.

Through the above search, it is found that the above technical solutions cannot affect the novelty of the present invention; and the mutual combination of the above patent documents cannot destroy the inventiveness of the present invention.

Contents of the invention

The purpose of the present invention is to solve the above problems and provide a cam follower motion analysis platform. This set of mechanism can intuitively display the drawing process of the motion law of the cam follower, deepen students' understanding of mechanical structures and cams, and stimulate students' learning Interest, improve students' hands-on ability, develop students' innovative thinking, effectively improve teaching quality and efficiency, and have far-reaching teaching significance.

In order to achieve the above purpose, the technical solution adopted by the present invention is: a cam follower motion analysis platform, which includes a cam conversion lever group mechanism arranged at the upper end of the general bracket, a paper feeding mechanism at the lower end, and a transmission mechanism at the side, and characterized in that,

The overall support includes two symmetrically arranged outer baffles (1) and a fixed rod (18), an auxiliary rod (19), and a pen holder (20) connected in the middle;

The paper-feeding mechanism includes a paper-feeding backing plate (2) horizontally arranged between the outer baffles (1); the upper and lower sides of the paper-feeding backing plate (2) are evenly and symmetrically provided with paper-feeding shafts (23), and the paper-feeding shafts (23) is evenly provided with a paper feed wheel (22); the paper feed wheel (22) is symmetrically engaged up and down in the paper feed wheel hole (27);

The transmission mechanism includes a gear reduction box (9) arranged at the bottom of the general support and connected to the motor (8); the gear reduction box (9) is connected with a cantilever shaft (10); The transmission mechanism (13) is connected with the camshaft (14); the camshaft (14) is uniformly provided with three cams (15) along the axial direction; Paper shaft (23) is connected;

The cam conversion rod group mechanism includes a telescopic rod (16) arranged between two outer baffles (1); a swing rod (21) is hinged on the telescopic rod (16); the swing rod (21) They are connected to each other in an X shape by means of a hinge, and the hinge points between the swing rods (21) are respectively slidingly connected with the fixed rod (17) and the movable rod (18) through linear bearings; one end of the telescopic rod (16) Respectively against the outer circumference of the corresponding cam (15), a return spring (25) is arranged between the other end and the outer baffle (1); the pen holder (20) is connected with a pen cover (24) through a linear bearing; The pen cover (24) is hinged to the swing rod (21); a drawing pen is arranged inside the pen cover (24).

Further, the inner side of the outer baffle plate (1) on one side is provided with a reduction box plate (3); the four corners of the reduction box plate (3) are connected to the outer baffle plate (1) on one side through the connecting rod (5) The connection constitutes the installation space of the reduction box; the gear reduction box (9) is arranged in the installation space of the reduction box; a motor fixing plate (4) is arranged between the reduction box plate (3) and the other side outer baffle (1) ); The motor (8) is provided on the motor fixing plate (4).

Further, both ends of the paper feeding shaft (23) are fixed on the outer baffle (1) through ball bearings.

Further, both ends of the telescopic rod (16) are fixed on the outer baffle (1) through linear bearings.

Further, the three cams (15) all take the camshaft (14) as the center and rotate in the same direction to deviate by a certain angle; the cams (15) have the same deviation angle.

Further, the cantilever shaft (10) is fixed by a fixed frame (6); the camshaft (14) is fixed by two upper and lower fixed suspension plates (7); the fixed suspension plate (7), the fixed frame (6) ) are all arranged on the outside of the outer baffle (1).

Further, the outer baffle (1) is provided with a horizontal elongated waist-shaped hole (26); the two ends of the movable rod (17) are located in the waist-shaped hole (26);

Further, the pen cover (24) includes a pen cover one (41), a pen cover two (42), and a pen cover three (43); the telescopic rod (16) includes a telescopic rod one (61), a telescopic rod two (62), Telescoping rod three (63); Described swing rod (21) comprises swing rod one (31), swing rod two (32), swing rod three (33), swing rod four (34), swing rod five (35), Fork six (36), fork seven (37), fork eight (38); described fork one (31) end and fork two (32) middle end, fork four (34) end are hinged on fixed Rod (18) same point, middle end and fork six (36) middle ends are hinged at movable bar (17) same point, and front end is hinged with pen cover one (41); Described fork bar two (32) front ends and pen cover two ( 42) hinged, the end is hinged on the fixed rod (18); the front end of the swing rod three (33) is hinged with the pen cover three (43), the rear end is hinged on the fixed rod (18), and the middle end is connected with the swing rod four (34) ) front end is hinged at the same point of telescopic rod one (61); the middle end of said swing rod four (34) and the middle end of swing rod five (35) are hinged at the same point of movable rod (17); said swing rod five (35) The front end is hinged on the same point of the telescopic rod two (62) with the front end of the swing rod seven (37), and the end is hinged on the fixed rod (18); the front end of the swing rod six (36) is hinged on the auxiliary rod (19), and the end is connected to the The seven (37) ends of the fork are hinged at the same point of the fixed rod (18); the middle end of the seven (37) and eight (38) of the fork are hinged at the same point of the movable bar (17); the eight of the fork ( 38) the front end is hinged on the telescopic rod (63), and the end is hinged on the fixed rod (18).

Further, the end of the telescopic rod (16) in contact with the outer circumference of the cam (15) is provided with a miniature bearing (30) at the end.

Further, the outer baffle (1), the reduction box plate (3), the paper backing plate (2), and the motor fixing plate (4) are all plexiglass.

Beneficial effects of the present invention:

1. Various mechanical transmission mechanisms are adopted in the present invention, including spur gear mechanism, bevel gear mechanism, synchronous belt transmission, cam mechanism, lever mechanism, friction wheel mechanism, and the knowledge of mechanical principles is embodied through the combination of various mechanical transmission structures , and installed on a transparent plexiglass plate, it is clear at a glance, which greatly improves students' interest in learning knowledge of mechanical transmission and improves students' understanding of mechanical principles.

2. The present invention utilizes the chord method in combination with the principle of similar triangles to continuously and accurately draw the displacement diagram, velocity diagram, and acceleration diagram of the cam through a lever mechanism; with this device, we can clearly analyze the cam at each moment and state. It is more convenient for teaching, promotes and diverges students' thinking, makes the whole teaching process more fascinating, improves students' interest in learning, and improves teaching quality.

3. The present invention has simple and stable structure, light weight, low manufacturing cost, suitable for mass production, and strong practicability.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a structural schematic diagram of the rear part of the present invention.

Figure 3 is a front view of the present invention.

Fig. 4 is a structural schematic diagram of the cam conversion lever group mechanism in the present invention.

Fig. 5 is a partial structural schematic diagram of the cam conversion lever group mechanism in the present invention.

Fig. 6 is a schematic cross-sectional structure diagram of the cam conversion lever group mechanism in the present invention.

Fig. 7 is a schematic diagram of the structural relationship between the cam and the telescopic rod in the present invention.

FIG. 8 is an enlarged view of part A in FIG. 1 .

Fig. 9 is a schematic diagram of drawing cam displacement, velocity and acceleration through paper feeding in the present invention.

The numbers shown in the figure are marked as: 1. Outer baffle, 2. Paper feeding backing plate, 3. Gear box plate, 4. Motor fixing plate, 5. Connecting rod, 6. Fixing frame, 7. Fixed suspension plate, 8, motor, 9, gear reduction box, 10, cantilever shaft, 11, two-stage spur gear reduction mechanism, 12, synchronous pulley mechanism, 13, bevel gear transmission mechanism, 14, camshaft, 15, cam, 16, Telescopic rod, 17, movable rod, 18, fixed rod, 19, auxiliary rod, 20, pen holder, 21, pendulum rod, 22, paper feeding wheel, 23, paper feeding shaft, 24, pen cap, 25, return spring, 26 , waist-shaped hole, 27, paper feeding wheel hole, 28, driven shaft, 29, paper feeding, 30, miniature bearing, 31, swing rod one, 32, swing rod two, 33, swing rod three, 34, swing rod Four, 35, pendulum five, 36, pendulum six, 37, pendulum seven, 38, pendulum eight, 41, pen case one, 42, pen case two, 43, pen case three.

Detailed ways

In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present invention. .

As shown in Figures 1-9, the structural connection relationship of the present invention is: a cam follower motion analysis platform, which includes a cam conversion lever group mechanism arranged at the upper end of the general bracket, a paper feeding mechanism at the lower end, and a transmission mechanism at the side institution, characterized in that,

The overall support includes two symmetrically arranged outer baffles 1 and a fixed rod 18 connected therebetween, an auxiliary rod 19, and a pen holder 20;

The paper-feeding mechanism includes a paper-feeding backing plate 2 horizontally arranged between the outer baffles 1; the upper and lower sides of the paper-feeding backing plate 2 are uniformly and symmetrically provided with paper-feeding shafts 23, and paper-feeding wheels are uniformly arranged on the paper-feeding shafts 23 22; the paper feed wheel 22 is symmetrically engaged up and down in the paper feed wheel hole 27;

The transmission mechanism includes a gear reduction box 9 arranged at the bottom of the general support and connected to the motor 8; the gear reduction box 9 is connected with a cantilever shaft 10; the cantilever shaft 10 is connected with the camshaft 14 through a bevel gear transmission mechanism 13; the Three cams 15 are evenly arranged in the axial direction on the camshaft 14; the cantilever shaft 10 is connected with the paper feeding shaft 23 through a synchronous pulley mechanism 12;

The cam conversion rod group mechanism includes a telescopic rod 16 arranged between two outer baffles 1; a swing rod 21 is hinged on the telescopic rod 16; the swing rods 21 are connected to each other in an X shape through a hinge , the hinge points between the swing rods 21 are respectively slidingly connected with the fixed rod 17 and the movable rod 18 through linear bearings; A return spring 25 is arranged between them; a pen cover 24 is connected to the pen holder 20 through a linear bearing; the pen cover 24 is hinged to the swing rod 21; a drawing pen is arranged inside the pen cover 24 .

Preferably, the inner side of the outer baffle plate 1 on one side is provided with a reduction box plate 3; the four corners of the reduction box plate 3 are connected with the outer baffle plate 1 on one side through connecting rods 5 to form a reduction box installation space; The reduction box 9 is arranged in the installation space of the reduction box; a motor fixing plate 4 is arranged between the reduction box plate 3 and the outer baffle plate 1 on the other side; a motor 8 is arranged on the motor fixing plate 4 .

Preferably, both ends of the paper feeding shaft 23 are fixed on the outer baffle 1 through ball bearings.

Preferably, both ends of the telescopic rod 16 are fixed on the outer baffle 1 through linear bearings.

Preferably, the three cams 15 are centered on the camshaft 14 and rotate in the same direction with a certain angle; the cams 15 have the same deviation angle.

Preferably, the cantilever shaft 10 is fixed by a fixed frame 6; the camshaft 14 is fixed by two upper and lower fixed suspension plates 7;

Preferably, the outer baffle 1 is provided with a horizontal elongated waist-shaped hole 26; both ends of the movable rod 17 are located in the waist-shaped hole 26;

Preferably, the pen cover 24 includes a pen cover one 41, a pen cover two 42, and a pen cover three 43; the telescopic rod 16 includes a telescopic rod one 61, a telescopic rod two 62, and a telescopic rod three 63; the swing rod 21 includes a swing rod one 31, pendulum two 32, pendulum three 33, pendulum four 34, pendulum five 35, pendulum six 36, pendulum seven 37, pendulum eight 38; End, swing bar four 34 ends are hinged at the same point of fixed bar 18, and the middle end and swing bar six 36 middle ends are hinged at the same point of movable bar 17, and the front end is hinged with pen cover one 41; Hinged, the end is hinged on the fixed rod 18; the front end of the swing rod three 33 is hinged with the pen cover three 43, the rear end is hinged on the fixed rod 18, and the middle end and the front end of the swing rod four 34 are hinged at the same point of the telescopic rod one 61; The middle end of swing rod four 34 and the middle end of swing rod five 35 are hinged at the same point of movable rod 17; above; the front end of the swing rod six 36 is hinged on the auxiliary rod 19, and the end is hinged at the same point as the end of the swing rod seven 37 on the fixed rod 18; the middle end of the swing rod seven 37 is hinged on the movable rod 17 with the swing rod eight 38 One point; the front end of the swing rod 8 38 is hinged on the telescopic rod 63, and the end is hinged on the fixed rod 18.

Preferably, the end of the telescopic rod 16 in contact with the outer circumference of the cam 15 is provided with a miniature bearing 30 at the end.

Preferably, the outer baffle plate 1, the reduction box plate 3, the paper backing plate 2, and the motor fixing plate 4 are all plexiglass.

Overall structure design:

Since this device is a teaching and demonstration instrument, it should be small and intuitive, lightweight, and easy to move, but it must also have a certain strength and rigidity to ensure that it can bear the weight of the motor, gear and its accessories. The study decided to use a plexiglass plate as the external baffle, and the plexiglass plate has a certain strength and can fully bear the weight of the entire mechanism. In the overall design, the motor and the gearbox are the first part. The motor is the driving force source of the whole device. We place the motor and the gearbox under the whole device, which is conducive to the beauty of the device and facilitates transmission. Then there is the cam part, we use the structure of the cantilever beam, this kind of setting is not only beautiful but also easy to disassemble, and it is convenient to replace different cams. Furthermore, for the rod group, since the principle adopted is the method of drawing similar triangles, we use fixed thin rods as support rods, and swing rods as transmission rods, which can not only reduce the weight of the device, but also facilitate the transmission. . Then there is the drawing part. In order to reduce the resistance of the mechanism, we set up three sets of wheels, and then use a plexiglass plate as a backing plate to reduce friction.

Design of gearbox part:

Due to the large driving force required by the mechanism and the large power consumption, we use a 120W, 1400r/min single-phase motor to drive, but the drawing itself is too fast to affect the accuracy of the drawing, so we reduce it through the reduction box. slow speed. The motor is decelerated to 1.84r/min by a spur gear with a four-stage transmission ratio of 5.25 through a reduction box. The output of the reduction box is divided into two parts, one part drives the camshaft to rotate through the 1:3 bevel gear steering, and the other part is decelerated by the spur gear with a transmission ratio of 1:3, and then transmitted by the synchronous pulley for a long distance. The power shaft of the paper wheel realizes the synchronization of the paper feeding mechanism and the cam group.

Cam part design:

The cam is fixed by a cantilever beam structure, and a shaft is directly used as the driving force to drive the three cams to rotate. The camshaft is connected to the low-speed bevel gear, and the angle of the cam is directly fixed through the angle hole made on the cam to achieve rotation at different angles. There are axial force and radial force on the camshaft, and the thrust bearing and deep groove ball bearing are used to ensure the normal operation of the shaft.

Mechanism design of cam conversion lever group:

At the beginning, the rod group uses its moving position directly on the follower to obtain the displacement map. In order to reset the follower, a spring is added to the end of the follower to reset it, and then the displacement of the follower is obtained through the swing rod. speed. As the core of this device, the pendulum part is divided into three layers. Because the similar triangle principle is used to transmit the height of the displacement difference, the pendulum and the pendulum are connected in an X form by hinges. When drawing the speed diagram, the X pole group The two end points of the two push rods are hinged on two adjacent push rods, and there is another end point that rotates around a fixed point. The distance between the remaining end point and the fixed end point is the displacement difference between the two push rods. Through this displacement difference, speed available. Three groups of putters get two speeds, and in the same way can get one acceleration. In order to move the starting point of the three graphs on the same end face, a parallel push rod is used to move the pen at one end to correspond to the acceleration for both velocity and displacement. In order to reduce the resistance in the movement of the pendulum, we add a linear bearing to the support structure of the pendulum as a carrier for the pendulum to slide on the positioning slender shaft. In order to prevent the bearing from rotating on the rod, some also use a pair of bearings to cooperate with each other.

paper feeding part design

In the design of the paper feeding mechanism, we use three sets of rollers to output synchronously, and install a backing plate in the middle of the rollers to support the drawing. The set of rollers at the output end is the driving wheel, and the other two sets are driven wheels. The drawing device then draws a corresponding track on the paper until it rolls out from the output end, so that the paper tape at the back can be automatically output when the machine is turned on.

The working principle of the present invention:

(1) The drawing principle of the displacement diagram of the follower movement

Using the direct drawing method, the motor drives the cam to move at a constant speed, driving the drawing pen on the cam conversion lever group mechanism to move left and right, and through the transmission of the synchronous pulley, the paper belt and the cam are guaranteed to move synchronously, and the drawing pen on the follower is drawn. Out of the displacement diagram, the device draws the diagram on the horizontal plane.

(2) The drawing principle of the velocity diagram of the follower movement

Chord line method: by V=△S/△t, it is transformed into V=△S*K1, wherein K1 is the speed proportional coefficient, as long as △S is measured, the speed can be obtained, and △S is obtained through similar triangles Principle measured.

The principle of similar triangles: Hinge two swing rods into an X-rod group, two of which are hinged on two adjacent push rods, and the other end is fixed, and the distance between the remaining end and the fixed end is the distance between the two push rods. Displacement difference, and then add a pen on this end point to draw the velocity diagram.

(3) The drawing principle of the acceleration diagram of the follower movement

Two sets of rods "sense" one speed, and three sets of rods "sense" two speeds.

Chord line method: according to a=△v/△t, the deformation is a=△v*K2, where k2 is the acceleration proportional coefficient, and the acceleration can be measured as long as △v is measured. △v is measured by the principle of similar triangles. Two pendulum rods are hinged to form an X rod group. Two of the end points are hinged on the two speeds "induced", the other end point is fixed, and the remaining end point is opposite to the fixed end point. The distance is △v, and then add a pen to this end point to draw the acceleration diagram.

It should be noted that, in this document, the terms "comprising", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or apparatus.

In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above examples is only used to help understand the method and core idea of the present invention. The above is only a preferred embodiment of the present invention. It should be pointed out that due to the limitation of literal expression, there are objectively unlimited specific structures. Under these circumstances, several improvements, modifications or changes can also be made, and the above-mentioned technical features can also be combined in an appropriate manner; these improvements, modifications, or combinations, or the idea and technical solution of the invention can be directly applied to other occasions without improvement should be regarded as the scope of protection of the present invention.

Claims (10)

1. a cam follower motion analysis platform, it comprises the cam selector bar group mechanism being arranged on total pedestal upper end, the paper advance mechanism of lower end, and the gear train of side, is characterized in that,

Described total support comprise symmetrically arranged two pieces of outer baffles (1) and middle connect fixed bar (18), auxiliary rod (19), walk penholder (20);

Described paper advance mechanism comprises being horizontally set on walks Paper baseplate (2) between outer baffle (1); Described walk Paper baseplate (2) upper and lower surface be provided with away reel (23) symmetrically, walk reel (23) is evenly provided with paper feed wheel (22); Described paper feed wheel (22) up and down symmetry is engaged in paper feed wheel bore (27);

Described gear train comprises the gear reduction box (9) being arranged on total frame bottom and being connected with motor (8); Described gear reduction box (9) is connected with cantilevered axle (10); Described cantilevered axle (10) is connected with camshaft (14) by bevel gear transmission (13); Described camshaft (14) is evenly provided with vertically three cams (15); Described cantilevered axle (10) by synchronous pulley mechanism (12) with walk reel (23) and be connected;

Described cam selector bar group mechanism comprises the expansion link (16) be arranged between two pieces of outer baffles (1); Described expansion link (16) is hinged with fork (21); Described fork is interconnected to X-shaped shape by articulated manner between (21), and the pin joint between described fork (21) is slidably connected with fixed bar (17), motion bar (18) respectively by linear bearing; Described expansion link (16) one end is against on corresponding cam (15) excircle respectively, is provided with back-moving spring (25) between the other end and outer baffle (1); Describedly walk penholder (20) is connected with the pen cap (24) by linear bearing; The described pen cap (24) is hinged with fork (21); The described pen cap is provided with ruling pen in (24).

2. a kind of cam follower motion analysis platform as claimed in claim 1, is characterized in that, described side outer baffle (1) inner side is provided with deceleration boxboard (3); Described deceleration boxboard (3) four angles connect and compose reducer casing installing space by connecting link (5) and side outer baffle (1); Described gear reduction box (9) is arranged in reducer casing installing space; Motor fixing plate (4) is provided with between described deceleration boxboard (3) and opposite side outer baffle (1); Described motor fixing plate (4) is provided with motor (8).

3. a kind of cam follower motion analysis platform as claimed in claim 1, is characterized in that, described in walk reel (23) two ends and be fixed on outer baffle (1) by ball bearing.

4. a kind of cam follower motion analysis platform as claimed in claim 1, is characterized in that, described expansion link (16) two ends are fixed on outer baffle (1) by linear bearing.

5. a kind of cam follower motion analysis platform as claimed in claim 1, is characterized in that, three described cams (15) all with camshaft (14) for the center of circle, in the same direction rotate depart from certain angle; Between described cam (15), deviation angle is identical.

6. a kind of cam follower motion analysis platform as claimed in claim 1, is characterized in that, described cantilevered axle (10) is fixed by fixed mount (6); Described camshaft (14) is fixed hanging deck (7) by upper and lower two panels and is fixed; Described fixing hanging deck (7), fixed mount (6) are all arranged on outer baffle-plate (1) outside.

7. a kind of cam follower motion analysis platform as claimed in claim 1, is characterized in that, described outer baffle (1) is provided with the strip waist-shaped hole (26) of horizontal direction; Described motion bar (17) two ends are in waist-shaped hole (26).

8. a kind of cam follower motion analysis platform as claimed in claim 1, is characterized in that, the described pen cap (24) comprises the pen cap one (41), the pen cap two (42), the pen cap three (43); Described expansion link (16) comprises expansion link one (61), expansion link two (62), expansion link three (63); Described fork (21) comprises fork one (31), fork two (32), fork three (33), fork four (34), fork five (35), fork six (36), fork seven (37), fork eight (38); Described fork one (31) end and fork two (32) middle-end, fork four (34) end are hinged on fixed bar (18) same point, middle-end and fork six (36) middle-end are hinged on motion bar (17) same point, front end and the pen cap one (41) hinged; Described fork two (32) front end and the pen cap two (42) hinged, end is hinged on fixed bar (18); Described fork three (33) front end and the pen cap three (43) hinged, rear end is hinged on fixed bar (18), and middle-end and fork four (34) front end are hinged on expansion link one (61) same point; Described fork four (34) middle-end and fork five (35) middle-end are hinged on motion bar (17) same point; Described fork five (35) front end and fork seven (37) front end are hinged on expansion link two (62) same point, and end is hinged on fixed bar (18); Described fork six (36) front end is hinged on auxiliary rod (19), and end and fork seven (37) end are hinged on fixed bar (18) same point; Described fork seven (37) middle-end and fork eight (38) are hinged on motion bar (17) same point; Described fork eight (38) front end is hinged on expansion link (63), and end is hinged on fixed bar (18).

9. a kind of cam follower motion analysis platform as claimed in claim 1, is characterized in that, one end that described expansion link (16) contacts with cam (15) excircle, and end is provided with miniature bearing (30).

10. a kind of cam follower motion analysis platform as claimed in claim 1, it is characterized in that, described outer baffle (1), deceleration boxboard (3), walk Paper baseplate (2), motor fixing plate (4) is organic glass.