Cam mechanism demonstration combined teaching aid

Abstract

The utility model relates to the technical field of teaching auxiliary devices, in particular to a cam mechanism demonstration combined teaching aid, which comprises two groups of bases, supporting rods are arranged on the bases, clamping plates are arranged on one sides of the supporting rods, and a demonstration panel is arranged between the clamping plates; the sliding rod fixing frame is arranged on one side of the demonstration panel, a sliding rod groove is formed in the sliding rod fixing frame, and a sliding rod is arranged in the sliding rod groove; the rotating assembly is arranged on one side of the demonstration panel, the transmission assembly is connected with a connecting rod, and one end of the connecting rod is connected with the sliding rod; the 3D scanning assembly is arranged on one side of the connecting rod; the 3D scanner has the beneficial effects that by rotating the grip, the cam is driven to rotate, the sliding rod at one end of the connecting rod is driven to move in a reciprocating mode, at the moment, the elastic block is extruded, the elastic block is inserted into the inserting groove, the 3D scanner is fixed to one side of the connecting rod, and then the motion trail of the cam is recorded through a probe on the 3D scanner; the recorded data can be transmitted to a 3D printer for printing.

Description

Technical Field

[0001] The utility model relates to the technical field of teaching auxiliary devices, in particular to a cam mechanism demonstration combined teaching aid. Background Art

[0002] In the teaching of mechanical courses, the teaching method of cam is relatively simple, and it is often demonstrated through textbook examples and plane graphics. The static plane graphics demonstration is relatively abstract, and it is difficult for students to understand the motion law of the follower in the cam mechanism and the cam profile curve generation process; it is difficult to accurately draw the follower motion curve and the cam profile curve by pure manual method during the teacher's explanation, and the demonstration process is time-consuming; sometimes teachers will use CAD to demonstrate the generation process of motion curves and contour lines, which requires certain drawing skills and requires a computer equipped with CAD software; sometimes teachers will use some animations to demonstrate the cam mechanism, but there are certain differences between the animation model and the real object, which is not conducive to establishing relevant mechanical concepts; and the cam instruments in the laboratory are often bulky, single-function, inconvenient to carry and cannot achieve teaching effects; all these have brought inconvenience to cam teaching, so it is imperative to invent a simple and portable teaching tool that can display the cam follower motion curve and cam profile curve;

[0003] In the prior art, a Chinese patent with publication number CN210596280U discloses a cam mechanism demonstration combination teaching aid, including: a demonstration panel, the demonstration panel has a demonstration surface and an operating surface; a guide rod slide rail, which is arranged above the demonstration surface, and a horizontal slide groove and a vertical slide groove are provided on the guide rod slide rail; an active component, including a cam and a hand crank, the cam is arranged below the demonstration surface, and the hand crank is arranged on the operating surface and is eccentrically connected to the cam; a driven component, including a straight guide rod, a T-shaped guide rod and a rocker assembly for forming various cam motion mechanisms, the straight guide rod or the T-shaped guide rod is selectively installed in the horizontal slide groove or the vertical slide groove according to the needs of the desired demonstration cam mechanism, and the rocker assembly is selectively connected to the straight guide rod and the cam according to the needs, and the active component and the driven component are selectively combined to demonstrate a cam motion mechanism. The utility model can clearly show the motion principles of various cam motion mechanisms on the demonstration surface, increase the interest of teaching, and thus effectively enhance students' perceptual understanding of related content;

[0004] When it is necessary to record the motion trajectory of the cam and print the recorded data through 3D printing technology, the teaching interactivity and sense of participation can be improved. The rational use of 3D printing technology can form the required devices faster and more conveniently. At the same time, it is more cutting-edge and more in line with the timeliness of scientific and technological progress, making teaching more convenient and quick. Utility Model Content

[0005] The purpose of the present utility model is to provide a demonstration combined teaching aid for a cam mechanism to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above purpose, the present utility model provides the following technical solutions:

[0007] A demonstration combined teaching aid for a cam mechanism, comprising:

[0008] A base, there are two groups of the bases, the two groups of bases are axially symmetrically distributed, a support rod is provided at the center position of one side of each base, and a clamping plate in a "C" shape structure is provided on one side of the two support rods, and a demonstration panel is arranged between the two clamping plates;

[0009] A sliding rod fixing frame, the sliding rod fixing frame is fixedly arranged at the upper end of one side of the demonstration panel, and a sliding rod groove is opened inside the sliding rod fixing frame, and a matching sliding rod is slidably arranged inside the sliding rod groove;

[0010] A rotating assembly, arranged on one side of the demonstration panel, the rotating assembly is connected with a connecting rod, and one end of the connecting rod is connected with the sliding rod;

[0011] A 3D scanning assembly, including a 3D scanner, the 3D scanner is arranged on one side of the connecting rod.

[0012] Preferably, one end of the sliding rod is connected with a second limiting post, a matching chute is opened at the position of the connecting rod corresponding to the second limiting post, one end of the second limiting post away from the sliding rod is inserted into the chute, and a matching second limiting ring is fixedly arranged on the surface of the second limiting post corresponding to the chute, there are two groups of the second limiting rings, the two groups of second limiting rings are respectively located on both sides of the connecting rod, and the second limiting post is hinged with the connecting rod through the cooperation of the two groups of second limiting rings;

[0013] A fixing rod is arranged on the side wall of the demonstration panel corresponding to the position of one end of the connecting rod away from the sliding rod, and the fixing rod is rotatably connected with one end of the connecting rod away from the sliding rod.

[0014] Preferably, the rotating assembly includes a rotating shaft groove, the rotating shaft groove is opened at the center position of the demonstration panel corresponding to the connecting rod, a matching rotating shaft is rotatably arranged inside the rotating shaft groove, one end of the rotating shaft passes through the rotating shaft groove and is connected with a rotating ring, and a handle is connected to the side of the rotating ring away from the rotating shaft;

[0015] The end of the rotating shaft away from the rotating ring passes through the rotating shaft groove and is fixedly connected with a rotating rod.

[0016] Preferably, a return groove is provided at a position of the connecting rod corresponding to the rotating rod, a matching first limiting column is slidably provided inside the return groove, a cam is fixedly connected to one end of the first limiting column facing the rotating rod, and a side of the cam away from the first limiting column is connected to the end of the rotating rod;

[0017] One end of the first limiting column away from the cam passes through the return groove and is connected to a first limiting ring.

[0018] Preferably, a rotation groove is provided at the end position of the connecting rod corresponding to the fixed rod, a matching fixed column is rotatably provided inside the rotation groove, and one end of the fixed column is fixedly connected to the fixed rod;

[0019] A third limiting ring is fixedly arranged on the surface of the fixing column at a position corresponding to the rotating groove. Two groups of the third limiting rings are arranged, and the two groups of the third limiting rings are respectively arranged on both sides of the connecting rod.

[0020] Preferably, the 3D scanner is arranged at one end of the connecting rod close to the sliding rod, and a probe is fixedly arranged on the 3D scanner;

[0021] Two groups of symmetrically distributed slots are provided on the side wall of the connecting rod at the position corresponding to the 3D scanner, and the slots are in an "L"-shaped structure. Matching connecting columns are provided on the side wall of the 3D scanner at the position corresponding to the slots, and the sizes of the connecting columns and the vertical grooves of the slots match.

[0022] Preferably, a spring block groove is provided on the side wall of the connecting column at a position corresponding to the transverse groove of the slot, a matching spring block is inserted inside the spring block groove, a first elastic member is provided between the side wall of the spring block and the inner side wall of the spring block groove, the spring block is elastically inserted into the transverse groove of the slot through the first elastic member, and the lower end surface of one end of the spring block away from the first elastic member is provided as a beveled surface.

[0023] Preferably, one side wall of the 3D scanner is provided with two groups of symmetrically distributed pull rod grooves, the inner side wall of each pull rod groove is provided with a slider groove, a slider is slidably arranged inside the slider groove, and a second elastic member is arranged between the top of the slider and the inner top of the slider groove;

[0024] A pull rod is slidably arranged inside the pull rod groove, one end of the pull rod passes through the pull rod groove and is connected to the side wall of the sliding block;

[0025] A pull rope groove is provided between the slider groove and the corresponding spring block groove, a pull rope is provided inside the pull rope groove, two ends of the pull rope are respectively connected to the side wall of the slider and the side wall of the spring block, and the elastic force of the first elastic member is greater than the elastic force of the second elastic member.

[0026] Compared with the prior art, the beneficial effects of the utility model are:

[0027] The utility model drives the cam to rotate by rotating the handle, thereby driving the first limit column to slide in the return groove inside the connecting rod, driving the slide bar at one end of the connecting rod to reciprocate inside the slide bar groove, and the other end of the connecting rod rotates inside the rotating groove through the fixed column;

[0028] When the 3D scanner is needed to record the motion trajectory of the cam, the elastic block is squeezed and inserted into the slot by the force of the first elastic member, and the 3D scanner is fixed on one side of the connecting rod, and the motion trajectory of the cam is recorded by the probe on the 3D scanner, and the recorded data can be printed by a 3D printer;

[0029] When the 3D scanner is not needed, the slider is driven to slide in the slider slot by toggling the pull rod, and then the spring block is driven to slide in the spring block slot by the pull rope. At this time, the spring block is no longer inserted in the slot, and the 3D scanner can be taken out as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0031] Figure 2 It is a schematic cross-sectional view of the three-dimensional structure of the utility model;

[0032] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0033] Figure 4 for Figure 2 The enlarged structural diagram at B in the middle;

[0034] Figure 5 for Figure 2 The enlarged structural diagram at C in the middle;

[0035] Figure 6 It is a schematic diagram of the three-dimensional structure section of the connecting rod 8 of the utility model;

[0036] Figure 7 for Figure 6 The enlarged structural diagram at D in the middle;

[0037] Figure 8 for Figure 6Enlarged structural diagram at E in the middle.

[0038] In the figure: base 1, support rod 2, demonstration panel 3, clamping plate 4, slide rod fixing frame 5, slide rod groove 6, slide rod 7, connecting rod 8, cam 9, fixing rod 10, return groove 11, handle 12, swivel 13, shaft groove 14, shaft 15, rotating rod 16, first limiting ring 17, first limiting column 18, second limiting column 19, second limiting ring 20, slide groove 21, fixing column 22, rotating groove 23, third limiting ring 24, spring block groove 25, spring block 26, slot 27, connecting column 30, first elastic member 31, rope groove 32, rope 33, 3D scanner 34, slide block groove 35, slide block 36, second elastic member 37, pull rod groove 38, pull rod 39, probe 40. DETAILED DESCRIPTION

[0039] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in combination with the accompanying drawings by way of examples.

[0040] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0041] In addition, in the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. However, if it is indicated as a direct connection, it means that the two connected bodies are not connected through an intermediate structure, but are connected to form a whole only through a connecting structure. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0043] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, descriptions with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0044] Embodiment 1:

[0045] Please refer to Figures 1 to 8 , the present utility model provides a technical solution: a combined teaching aid for demonstrating a cam mechanism, including:

[0046] A base 1, there are two sets of the base 1, the two sets of the base 1 are axially symmetrically distributed, a support rod 2 is provided at the center position on one side of each base 1, and a clamping plate 4 in a "C" - shaped structure is provided on one side of the two support rods 2, and a demonstration panel 3 is arranged between the two clamping plates 4;

[0047] A slide - rod fixing frame 5, the slide - rod fixing frame 5 is fixedly arranged at the upper - end side of the demonstration panel 3, and a slide - rod groove 6 is opened inside the slide - rod fixing frame 5, and a matching slide rod 7 is slidably arranged inside the slide - rod groove 6;

[0048] A rotating assembly, arranged on one side of the demonstration panel 3, the rotating assembly is connected with a connecting rod 8, and one end of the connecting rod 8 is connected with the slide rod 7;

[0049] A 3D scanning assembly, including a 3D scanner 34, the 3D scanner 34 is arranged on one side of the connecting rod 8;

[0050] The cam is driven to rotate through the rotating assembly, thereby driving the connecting rod 8 to reciprocate, and the movement track of the cam is recorded by the 3D scanning assembly.

[0051] Embodiment 2:

[0052] As Figures 2 to 5 shown, the combined teaching aid for demonstrating a cam mechanism disclosed in Embodiment 2 of the present utility model has basically the same structure as that in Embodiment 1, and the difference lies in:

[0053] One end of the slide bar 7 is connected to a second limiting column 19, and a matching slide groove 21 is provided at the end of the connecting rod 8 at a position corresponding to the second limiting column 19. The end of the second limiting column 19 away from the slide bar 7 is inserted into the inside of the slide groove 21, and a matching second limiting ring 20 is fixedly provided at the surface of the second limiting column 19 at a position corresponding to the slide groove 21. The second limiting ring 20 is provided with two groups, and the two groups of the second limiting rings 20 are respectively located on both sides of the connecting rod 8. The second limiting column 19 is hinged to the connecting rod 8 through the cooperation of the two groups of the second limiting rings 20.

[0054] A fixing rod 10 is provided on the side wall of the demonstration panel 3 at a position corresponding to one end of the connecting rod 8 away from the sliding rod 7, and the fixing rod 10 is rotatably connected to one end of the connecting rod 8 away from the sliding rod 7;

[0055] The rotating assembly includes a rotating shaft groove 14, and the rotating shaft groove 14 is opened at the center position of the demonstration panel 3 corresponding to the connecting rod 8. A matching rotating shaft 15 is rotatably arranged inside the rotating shaft groove 14, and one end of the rotating shaft 15 passes through the rotating shaft groove 14 and is connected to a rotating ring 13, and a handle 12 is connected to the side of the rotating ring 13 away from the rotating shaft 15;

[0056] One end of the rotating shaft 15 away from the rotating ring 13 passes through the rotating shaft slot 14 and is fixedly connected to a rotating rod 16;

[0057] The connecting rod 8 is provided with a return groove 11 at a position corresponding to the rotating rod 16, and a matching first limiting column 18 is slidably arranged inside the return groove 11. A cam 9 is fixedly connected to one end of the first limiting column 18 facing the rotating rod 16, and a side of the cam 9 away from the first limiting column 18 is connected to the end of the rotating rod 16;

[0058] One end of the first limiting column 18 away from the cam 9 passes through the return groove 11 and is connected to a first limiting ring 17;

[0059] The connecting rod 8 is provided with a rotation groove 23 at the end position corresponding to the fixing rod 10, and a matching fixing column 22 is rotatably arranged inside the rotation groove 23, and one end of the fixing column 22 is fixedly connected to the fixing rod 10;

[0060] A third limiting ring 24 is fixedly disposed on the surface of the fixing column 22 at a position corresponding to the rotation groove 23. Two groups of the third limiting rings 24 are disposed, and the two groups of the third limiting rings 24 are respectively disposed on both sides of the connecting rod 8;

[0061] By rotating the handle 12, the cam 9 is driven to rotate, which in turn drives the first limit column 18 to slide in the return groove 11 inside the connecting rod 8, driving the slide bar 7 at one end of the connecting rod 8 to reciprocate inside the slide bar groove 6, and the other end of the connecting rod 8 rotates inside the rotating groove 23 through the fixed column 22.

[0062] Embodiment three:

[0063] like Figures 6 to 8 As shown, the cam mechanism demonstration combined teaching aid disclosed in the third embodiment of the present invention has a structure that is substantially the same as that in the second embodiment, except that:

[0064] The 3D scanner 34 is disposed at one end of the connecting rod 8 close to the sliding rod 7, and a probe 40 is fixedly disposed on the 3D scanner 34;

[0065] Two groups of symmetrically distributed slots 27 are provided at the side wall of the connecting rod 8 at the position corresponding to the 3D scanner 34, and the slots 27 are in an "L"-shaped structure. Matching connecting columns 30 are provided at the side wall of the 3D scanner 34 at the position corresponding to the slots 27, and the sizes of the connecting columns 30 and the vertical grooves of the slots 27 match each other;

[0066] The side wall of the connecting column 30 is provided with a spring block groove 25 at a position corresponding to the transverse groove of the slot 27, and a matching spring block 26 is inserted in the spring block groove 25. A first elastic member 31 is provided between the side wall of the spring block 26 and the inner side wall of the spring block groove 25. The spring block 26 is elastically inserted in the transverse groove of the slot 27 through the first elastic member 31, and the lower end surface of one end of the spring block 26 away from the first elastic member 31 is provided with a chamfered surface.

[0067] The side wall of one side of the 3D scanner 34 is provided with two groups of symmetrically distributed pull rod grooves 38, and the inner side wall of each pull rod groove 38 is provided with a slider groove 35, and a slider 36 is slidably arranged inside the slider groove 35, and a second elastic member 37 is arranged between the top of the slider 36 and the inner top of the slider groove 35;

[0068] A pull rod 39 is slidably disposed inside the pull rod groove 38 , and one end of the pull rod 39 passes through the pull rod groove 38 and is connected to the side wall of the slider 36 ;

[0069] A rope groove 32 is provided between the slider groove 35 and the corresponding spring block groove 25, a rope 33 is provided inside the rope groove 32, two ends of the rope 33 are respectively connected to the side wall of the slider 36 and the side wall of the spring block 26, and the elastic force of the first elastic member 31 is greater than the elastic force of the second elastic member 37;

[0070] By squeezing the elastic block 26 and inserting the elastic block 26 into the slot 27 through the action of the first elastic member 31 , the 3D scanner 34 is fixed on one side of the connecting rod 8 .

[0071] The present solution is as follows: by rotating the handle 12, the cam 9 is driven to rotate, and the first limit column 18 is driven to slide in the return groove 11 inside the connecting rod 8, so that the slide bar 7 at one end of the connecting rod 8 moves back and forth inside the slide bar groove 6, and the other end of the connecting rod 8 rotates inside the rotation groove 23 through the fixed column 22;

[0072] When it is necessary to use a 3D scanner to record the movement trajectory of the cam, the spring block 26 is squeezed and the force of the first elastic member 31 is used to insert the spring block 26 into the inside of the slot 27, and the 3D scanner 34 is fixed to one side of the connecting rod 8, and then the movement trajectory of the cam 9 is recorded through the probe 40 on the 3D scanner 34.

[0073] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0074] The utility model is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A cam mechanism demonstration combined teaching aid, characterized in that: Comprising: A base (1), there are two sets of the base (1), the two sets of the base (1) are axially symmetrically distributed, a support rod (2) is provided at the center position of one side of each base (1), and a clamping plate (4) in a "C" - shaped structure is provided on one side of the two support rods (2), and a demonstration panel (3) is arranged between the two clamping plates (4); A slide - rod fixing frame (5), the slide - rod fixing frame (5) is fixedly arranged at the upper - end side of the demonstration panel (3), and a slide - rod groove (6) is formed inside the slide - rod fixing frame (5), and a matching slide rod (7) is slidably arranged inside the slide - rod groove (6); A rotating assembly, arranged on one side of the demonstration panel (3), the rotating assembly is connected with a connecting rod (8), and one end of the connecting rod (8) is connected with the slide rod (7); A 3D scanning assembly, including a 3D scanner (34), the 3D scanner (34) is arranged on one side of the connecting rod (8).

2. The cam mechanism demonstration combined teaching aid according to claim 1, characterized in that: One end of the slide rod (7) is connected with a second limit post (19), a matching chute (21) is formed at the position corresponding to the second limit post (19) at the end of the connecting rod (8), the end of the second limit post (19) away from the slide rod (7) is inserted into the inside of the chute (21), and a matching second limit ring (20) is fixedly arranged on the surface of the second limit post (19) corresponding to the position of the chute (21), there are two sets of the second limit rings (20), the two sets of the second limit rings (20) are respectively located on both sides of the connecting rod (8), and the second limit post (19) is hinged with the connecting rod (8) through the cooperation of the two sets of the second limit rings (20); A fixing rod (10) is arranged on the side wall of the demonstration panel (3) at the position corresponding to the end of the connecting rod (8) away from the slide rod (7), and the fixing rod (10) is rotatably connected with the end of the connecting rod (8) away from the slide rod (7).

3. The cam mechanism demonstration combined teaching aid according to claim 2, characterized in that: The rotating assembly includes a rotating - shaft groove (14), the rotating - shaft groove (14) is formed at the center position of the demonstration panel (3) corresponding to the connecting rod (8), a matching rotating shaft (15) is rotatably arranged inside the rotating - shaft groove (14), one end of the rotating shaft (15) passes through the rotating - shaft groove (14) and is connected with a rotating ring (13), and a handle (12) is connected to the side of the rotating ring (13) away from the rotating shaft (15); The end of the rotating shaft (15) away from the rotating ring (13) passes through the rotating - shaft groove (14) and is fixedly connected with a rotating rod (16).

4. The cam mechanism demonstration combined teaching aid according to claim 3, characterized in that: A loop - shaped groove (11) is formed at the position of the connecting rod (8) corresponding to the rotating rod (16), a matching first limit post (18) is slidably arranged inside the loop - shaped groove (11), one end of the first limit post (18) facing the rotating rod (16) is fixedly connected with a cam (9), and the side of the cam (9) away from the first limit post (18) is connected with the end of the rotating rod (16); One end of the first limiting column (18) away from the cam (9) passes through the return groove (11) and is connected to a first limiting ring (17).

5. The cam mechanism demonstration combined teaching aid according to claim 2, characterized in that: The connecting rod (8) is provided with a rotation groove (23) at the end position corresponding to the fixing rod (10), and a matching fixing column (22) is rotatably arranged inside the rotation groove (23), and one end of the fixing column (22) is fixedly connected to the fixing rod (10); A third limiting ring (24) is fixedly arranged on the surface of the fixed column (22) at a position corresponding to the rotating groove (23), and two groups of the third limiting rings (24) are arranged, and the two groups of the third limiting rings (24) are respectively arranged on both sides of the connecting rod (8).

6. The cam mechanism demonstration combined teaching aid according to claim 1, characterized in that: The 3D scanner (34) is arranged at one end of the connecting rod (8) close to the sliding rod (7), and a probe (40) is fixedly arranged on the 3D scanner (34); Two groups of symmetrically distributed slots (27) are provided at the position of the side wall of the connecting rod (8) corresponding to the position of the 3D scanner (34), and the slots (27) are in an "L"-shaped structure. Matching connecting columns (30) are provided at the position of the side wall of the 3D scanner (34) corresponding to the slots (27), and the sizes of the vertical grooves of the connecting columns (30) and the slots (27) match each other.

7. The cam mechanism demonstration combined teaching aid according to claim 6, characterized in that: A spring block groove (25) is provided on the side wall of the connecting column (30) at a position corresponding to the transverse groove of the insertion slot (27); a matching spring block (26) is inserted inside the spring block groove (25); a first elastic member (31) is provided between the side wall of the spring block (26) and the inner side wall of the spring block groove (25); the spring block (26) is elastically inserted into the transverse groove of the insertion slot (27) through the first elastic member (31); and a lower end surface of one end of the spring block (26) away from the first elastic member (31) is provided as a beveled surface.

8. The cam mechanism demonstration combined teaching aid according to claim 7, characterized in that: One side wall of the 3D scanner (34) is provided with two groups of symmetrically distributed pull rod grooves (38), the inner side wall of each pull rod groove (38) is provided with a slider groove (35), a slider (36) is slidably arranged inside the slider groove (35), and a second elastic member (37) is arranged between the top end of the slider (36) and the inner top end of the slider groove (35); A pull rod (39) is slidably disposed inside the pull rod groove (38), and one end of the pull rod (39) passes through the pull rod groove (38) and is connected to the side wall of the sliding block (36); A pull rope groove (32) is provided between the slider groove (35) and the corresponding spring block groove (25), a pull rope (33) is provided inside the pull rope groove (32), two ends of the pull rope (33) are respectively connected to the side wall of the slider (36) and the side wall of the spring block (26), and the elastic force of the first elastic member (31) is greater than the elastic force of the second elastic member (37).

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