Teaching stick for teaching

Abstract

The utility model relates to the technical field of teaching appliances, in particular to a teaching stick for teaching. The teaching stick for teaching comprises an outer tube and an inner tube. The outer pipe is provided with an insertion groove, and the lower bottom face of the inner pipe is installed in the outer pipe through the insertion groove. A moving groove and at least one limiting groove are formed in the outer pipe, the moving groove is formed in the axial direction of the outer pipe, and the moving groove communicates with the inserting groove. The limiting grooves are formed in the radial direction of the outer pipe, are formed in the ends, close to the upper bottom face of the outer pipe, of the moving grooves and communicate with the moving grooves. The inner pipe is provided with at least one first limiting piece, and the first limiting piece is installed in the moving groove in a sliding mode. By arranging the first limiting piece and the limiting groove, the limiting groove can limit the first limiting piece, so that the inner pipe and the outer pipe do not move relative to each other. Therefore, the stability of connection between the inner pipe and the outer pipe is improved, and the problem that the inner pipe and the outer pipe are easy to move in the using process of the teaching stick in the prior art, so that the teaching stick is inconvenient to use is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of teaching tools, in particular to a teaching stick. Background Art

[0002] With the improvement of people's quality of life and quality, education has received more and more attention from people. The teaching stick is one of the most frequently used teaching tools. It can be used to indicate the lesson plan on the blackboard when the teacher is teaching, and to assist students in understanding the teacher's teaching content. The teaching stick in the prior art is usually composed of an inner tube and an outer tube, and the inner tube and the outer tube are usually fixed by friction. After long-term use, the friction between the inner tube and the outer tube will become smaller, causing the inner tube and the outer tube to loosen; and if the teaching stick of the above structure is applied with force, the inner tube will shrink relative to the outer tube. In either of the above situations, there will be a problem that the inner tube and the outer tube of the teaching stick are easy to move during use, resulting in inconvenience in its use. Utility Model Content

[0003] In order to solve the problem in the prior art that the inner tube and the outer tube of the teaching stick may move, which makes the teaching stick inconvenient to use, the utility model provides a teaching stick for teaching.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: a teaching stick, comprising an outer tube and an inner tube, the outer tube is provided with a slot, the slot is extended from the upper bottom surface of the outer tube to the lower bottom surface of the outer tube, and the lower bottom surface of the inner tube is installed in the outer tube through the slot; the outer tube is provided with a movable groove and at least one limiting groove, the movable groove is arranged along the axial direction of the outer tube, and the movable groove is connected to the slot; the limiting groove is arranged along the radial direction of the outer tube, the limiting groove is arranged on one end of the movable groove close to the upper bottom surface of the outer tube, and the limiting groove is connected to the movable groove; the inner tube is provided with at least one first limiting member, the first limiting member is slidably installed in the movable groove, and the inner tube moves in the slot through the cooperation of the first limiting member and the movable groove; the first limiting member limits the relative movement between the inner tube and the outer tube by sliding into the limiting groove.

[0005] As a further improvement of the above solution, there are multiple limiting grooves, and the multiple limiting grooves are arranged along the axial direction of the outer tube, and each of the limiting grooves is connected to the movable groove respectively.

[0006] As a further improvement of the above solution, a plurality of the limiting grooves are arranged on the same side of the movable groove.

[0007] As a further improvement of the above solution, a plurality of the limiting grooves are symmetrically arranged on both sides of the movable groove.

[0008] As a further improvement of the above scheme, the limit groove includes a guide section and a limit section, one end of the guide section is connected to the movable groove, and the other end of the guide section is connected to the limit section; the minimum distance from the guide section to the upper bottom surface of the inner tube is c, the minimum distance from the side of the guide section connected to the movable groove to the upper bottom surface of the inner tube is a, and the minimum distance from the side of the guide section connected to the limit section to the upper bottom surface of the inner tube is b, and a, b and c satisfy: c>a and c>b.

[0009] As a further improvement of the above solution, the guide section is an arc-shaped structure.

[0010] As a further improvement of the above solution, the guide section is a U-shaped structure.

[0011] As a further improvement of the above solution, the first limiting member is a limiting column, and the limiting section is a circular structure.

[0012] As a further improvement of the above solution, there are multiple first limiting members, and the multiple first limiting members are arranged along the radial direction of the inner tube. The distance between two adjacent first limiting members is the same as the distance between two adjacent limiting grooves.

[0013] As a further improvement of the above solution, the movable groove is communicated with the upper bottom surface of the outer tube, and the inner tube and the outer tube are separated by the first limiting member moving along the movable groove toward the upper bottom surface of the outer tube.

[0014] As a further improvement of the above solution, a clamping piece is provided on the outer tube, and the clamping piece is arranged outside the outer tube and away from the moving groove. The clamping piece is used to place some teaching supplies such as laser pens.

[0015] As a further improvement of the above solution, a second limiting member is provided on the inner tube, and the second limiting member and the clamping member are on the same straight line in the axial direction of the outer tube.

[0016] As a further improvement of the above solution, the clamping member is a circular or arc-shaped structure.

[0017] Preferably, the clamping member is a rubber member.

[0018] Furthermore, the second limiting member is provided with a through hole, and the through hole is aligned with the clamping member.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] (1) In the utility model, a movable groove is provided, which mainly plays the role of providing a movable space, so that the inner tube can be moved in the movable groove through the first limiter to change the length of the teaching stick. At the same time, the limiter groove is matched, and the first limiter is clamped into the limiter groove to fix the first limiter. At this time, there will be no relative movement between the inner tube and the outer tube. Thereby, the stability of the connection between the inner tube and the outer tube is improved, and the problem that the inner tube and the outer tube of the teaching stick are easy to move during use in the prior art is effectively solved.

[0021] (2) By providing a movable groove and a plurality of limit grooves, and the plurality of limit grooves are provided along the radial direction of the outer tube. By providing a plurality of limit grooves, in the actual adjustment process, the first limit member can be inserted into the limit grooves at different positions according to the needs, so as to obtain angles of different lengths. In this way, the length of the entire teaching stick can be adjusted according to the needs, so as to meet the needs of different people and improve the practicality of the teaching stick.

[0022] (3) By setting the guide section and the limiting section, the minimum distance from the guide section to the upper bottom surface of the inner tube is c, the minimum distance from the side of the guide section connected to the movable groove to the upper bottom surface of the inner tube is a, and the minimum distance from the side of the guide section connected to the limiting section to the upper bottom surface of the inner tube is b, and a, b and c satisfy: c>a and c>b. As a result, an inflection point will appear on the guide section, and the inflection point prevents the first limiting member from moving from the limiting section to the guide section when no external force is applied, thereby further improving the firmness of the first limiting member being inserted into the limiting section, preventing the inner tube and the outer tube from moving when the teaching stick is in use, and improving the stability of the teaching stick when in use.

[0023] (4) By providing a clamping piece, some teaching supplies can be clamped, making it convenient to take or fix such teaching supplies during teaching. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The utility model is a three-dimensional diagram of the teaching stick for teaching.

[0025] Figure 2 The utility model is a front view of the teaching stick for teaching.

[0026] Figure 3 For this utility model Figure 2 A magnified schematic diagram of center A.

[0027] Figure 4 A three-dimensional diagram of the teaching stick provided by the utility model from another angle.

[0028] Figure 5 It is a three-dimensional diagram of the teaching stick for teaching without the clamping piece and the second limiting piece installed in the utility model.

[0029] Figure 6 The utility model is a front view of a teaching stick in which the limiting grooves are symmetrically arranged on both sides of the moving groove.

[0030] Figure 7 For this utility model Figure 5 A magnified schematic diagram of point B in the middle.

[0031] In the figure: 1, teaching stick; 10, outer tube; 11, moving groove; 12, limiting groove; 121, guide section; 122, limiting section; 20, inner tube; 21, first limiting member; 30, clamping member; 40, second limiting member; 41, through hole. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0033] In the description of the present utility model, it should be noted that for directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions and positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific protection scope of the present utility model. The terms "first", "second" and the like in the specification and claims of the present utility model are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. The terms "including" and "having" in the specification and claims of the present utility model and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device including a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] Reference Figure 1-7 As shown, an embodiment of the utility model provides a teaching stick 1, comprising an outer tube 10 and an inner tube 20. The outer tube 10 is provided with a slot, which is formed by extending from the upper bottom surface of the outer tube 10 to the lower bottom surface of the outer tube 10, and the lower bottom surface of the inner tube 20 is installed in the outer tube 10 through the slot. Among them, the outer tube 10 mainly plays the role of installation and accommodation, and can provide a position and space for installation or accommodation of other corresponding components in the teaching stick 1. The inner tube 20 mainly plays the role of adjusting the length of the teaching stick 1 and indicating.

[0035] like Figure 1 As shown, the outer tube 10 is provided with a moving groove 11 and at least one limiting groove 12, and the moving groove 11 is arranged along the axial direction of the outer tube 10, and the moving groove 11 is connected to the slot. The moving groove 11 mainly plays the role of providing a moving space. The moving groove 11 is arranged on the outer tube 10, so that the first limiting member 21 on the inner tube 20 can be moved in the moving groove 11 to adjust the length of the teaching stick 1. At the same time, by providing the first limiting member 21 and the moving groove 11, the moving groove 11 can also provide a limiting function when the inner tube 20 is telescopically moved along the slot, thereby ensuring the stability of the inner tube 20 during the movement process.

[0036] like Figure 1-2 As shown, the limiting groove 12 is arranged along the radial direction of the outer tube 10, and the limiting groove 12 is arranged on one side of the movable groove 11 close to the upper bottom surface of the outer tube 10, and the limiting groove 12 is connected to the movable groove 11. By directly connecting the limiting groove 12 with the movable groove 11, the distance required for the first limiting member 21 to move from the movable groove 11 to the limiting groove 12 can be effectively shortened, which is convenient for operation. In addition, the length of the guide section 121 can be shortened accordingly, which is convenient for processing.

[0037] like Figure 3 As shown, at least one first limiting member 21 is provided on the inner tube 20, and the first limiting member 21 is slidably installed in the movable groove 11. The inner tube 20 moves in the slot through the cooperation of the first limiting member 21 and the movable groove 11, thereby adjusting the length of the teaching stick 1 for teaching.

[0038] When the first limiting member 21 slides to the limiting groove 12, the limiting groove 12 can limit the first limiting member 21, and the inner tube 20 and the outer tube 10 do not move relative to each other. Therefore, in this embodiment, the inner tube 20 can be fixed by the mutual cooperation of the limiting groove 12 and the first limiting member 21, so as to ensure that the inner tube 20 and the outer tube 10 will not move relative to each other after the length is adjusted. The firmness of the connection between the inner tube 20 and the outer tube 10 is improved, thereby improving the stability of the teaching stick 1 when in use. The problem that the inner tube 20 and the outer tube 10 are fixed by friction in the prior art, and the inner tube 20 and the outer tube 10 become loose due to the decrease of friction after long-term use is effectively solved. At the same time, the problem that after the inner tube 20 and the outer tube 10 are fixed by friction in the prior art, if force is applied to them, the inner tube 20 will shrink relative to the outer tube 10, which makes it inconvenient to use can be solved.

[0039] In some embodiments, there can be one limiting groove 12. If there is one limiting groove 12, preferably, the limiting groove 12 is arranged at the top of the upper bottom surface of the outer tube 10 on the movable groove 11. At this time, the movable groove 11 is not connected to the upper bottom surface of the outer tube 10, and the teaching stick 1 has only one length adjustment, and its adjustment length is the length of the movable groove 11. When the teaching stick 1 of this structure needs to be adjusted, the first limiting member 21 of the inner tube 20 can be moved along the movable groove 11 toward the upper bottom surface of the outer tube 10 until it abuts against the top end of the movable groove 11. Then, the inner tube 20 is rotated in the direction of the limiting groove 12, so that the first limiting member 21 on the inner tube 20 can be moved into the limiting groove 12, thereby limiting the first limiting member 21 through the limiting groove 12. At this time, under the action of the first limiting member 21 and the limiting groove 12, no movement will occur between the inner tube 20 and the outer tube 10. Therefore, after adjusting the length of the teaching stick 1, relative movement will not occur between the inner tube 20 and the outer tube 10, thereby improving the stability of the teaching stick 1 when in use.

[0040] like Figure 2 As shown, in other embodiments, there may be multiple limiting grooves 12. If there are multiple limiting grooves 12, the limiting grooves 12 can be arranged in sequence along the radial direction of the outer tube 10, and each limiting groove 12 is connected to the movable groove 11. The purpose of setting multiple limiting grooves 12 is to be able to adjust the teaching stick 1 to multiple gears. When it is necessary to adjust the teaching stick 1 to the longest, the first limiting member 21 on the inner tube 20 can be moved along the movable groove 11 to be flush with the limiting groove 12 closest to the upper bottom surface of the outer tube 10. Then the inner tube 20 is rotated in the direction of the limiting groove 12, so that the first limiting member 21 on the inner tube 20 can be moved into the limiting groove 12, thereby limiting the first limiting member 21 through the limiting groove 12. At this time, under the action of the first limiting member 21 and the limiting groove 12, no movement will occur between the inner tube 20 and the outer tube 10. Therefore, under this structure, the first limiting member 21 can be inserted into the limiting groove 12 at different positions to adjust the length of the teaching stick 1 to meet the needs of different people and improve the practicality of the teaching stick 1.

[0041] like Figure 2 and Figure 3 As shown, a plurality of limiting grooves 12 are arranged on the same side of the movable groove 11. In actual operation, in order to further improve the stability of the connection between the inner tube 20 and the outer tube 10, a plurality of first limiting members 21 may be arranged. When there are a plurality of first limiting members 21, the plurality of limiting grooves 12 must be arranged on the same side of the movable groove 11, so that after adjusting the position of the inner tube 20, the inner tube 20 can be rotated in the direction of the limiting groove 12, so that the first limiting member 21 can enter the limiting groove 12. Thus, under the action of the limiting groove 12, the first limiting member 21 can be limited.

[0042] It is understandable that if the number of the first limiting member 21 is one, the plurality of limiting grooves 12 can be disposed on the same side of the moving groove 11 , or can be disposed on both sides of the moving groove 11 .

[0043] like Figure 6 and Figure 7 As shown, a plurality of limit grooves 12 are symmetrically arranged on both sides of the movable groove 11. In this way, the inner tube 20 can be rotated according to personal habits, thereby improving the flexibility of the teaching stick 1 during use.

[0044] like Figure 3 As shown, the limiting groove 12 includes a guide section 121 and a limiting section 122. One end of the guide section 121 is connected to the moving groove 11, and the other end of the guide section 121 is connected to the limiting section 122. The first limiting member 21 is suitable for moving into the limiting section 122 through the guide section 121. The guide section 121 mainly plays a guiding role, and the limiting section 122 mainly plays a limiting role. By setting the guide section 121, the first limiting member 21 can switch back and forth between the moving groove 11 and the limiting section 122, thereby improving the smoothness and stability of the first limiting member 21 during the switching process. The minimum distance from the guide section 121 to the upper bottom surface of the inner tube 20 is c, the minimum distance from the side of the guide section 121 connected to the moving groove 11 to the upper bottom surface of the inner tube 20 is a, and the minimum distance from the side of the guide section 121 connected to the limiting section 122 to the upper bottom surface of the inner tube 20 is b, and a, b and c satisfy: c>a and c>b. When a, b and c satisfy the above relationship, an inflection point will appear on the guide section 121. Under the action of the inflection point, the first limiting member 21 can be stably limited in the limiting section 122, so that the first limiting member 21 in the limiting section 122 is not easy to freely move from the limiting section 122 to the guide section 121, thereby improving the firmness and stability of the entire limiting groove 12 limiting the first limiting member 21.

[0045] In actual use, the end held by the hand is the lower bottom surface of the outer tube 10, and the end of the upper bottom surface of the inner tube 20 is the end that contacts and indicates the blackboard or electronic display screen. Therefore, in actual operation, the teaching stick 1 is generally used with the upper bottom surface of the inner tube 20 facing upward. In this state, the guide end is set to an arc structure or a U-shaped structure, so that the first limiter 21 can be limited to a certain extent by using the structural shape of the guide section 121 itself, so that the guide section 121 can also prevent the first limiter 21 from moving into the movable groove 11, further improving the stability of the entire limiter groove 12 limiting the first limiter 21. In this way, the inner tube 20 and the outer tube 10 can be more stable when in use, and the situation that the inner tube 20 shrinks into the outer tube 10 will not occur.

[0046] like Figure 4As shown, preferably, the upper bottom surface of the inner tube 20 is a spherical or ellipsoidal structure. The purpose of setting it to a spherical or ellipsoidal structure is that when the inner tube 20 is used to match a blackboard or an electronic display screen, the upper bottom surface of the inner tube 20 will not scratch the blackboard or the electronic display screen.

[0047] like Figure 3 As shown, the guide section 121 is an arc-shaped structure. The arc-shaped structure can facilitate the first limiter 21 to move smoothly from the moving groove 11 to the limiter section 122, thereby improving the smoothness of the first limiter 21 switching between the moving groove 11 and the limiter section 122.

[0048] The guide section 121 is a U-shaped structure, which can further prevent the first position-limiting member 21 from moving from the position-limiting section 122 to the moving groove 11 , and further improve the stability of the position-limiting section 122 limiting the first position-limiting member 21 .

[0049] In some embodiments, the opening of the guide section 121 faces the upper bottom surface of the outer tube 10. At this time, it is necessary to ensure that c>a and c>b.

[0050] In other embodiments, the opening of the guide section 121 faces the lower bottom surface of the outer tube 10. In this case, it is necessary to ensure that c<a and c<b.

[0051] It is understandable that no matter whether the opening of the guide segment 121 faces the upper bottom surface or the lower bottom surface of the outer tube 10 , in the actual production process, it is necessary to ensure that the opening directions of the plurality of guide segments 121 are consistent.

[0052] The first limiting member 21 is a limiting column, and the limiting section 122 is a circular structure.

[0053] There are multiple first stoppers 21, and the multiple first stoppers 21 are arranged along the radial direction of the inner tube 20. The arrangement of multiple first stoppers 21 can further improve the stability between the inner tube 20 and the outer tube 10. The distance between two adjacent first stoppers 21 is the same as the distance between two adjacent stop slots 12. Therefore, when the inner tube 20 is rotated, the multiple first stoppers 21 can move into the corresponding stop slots 12 respectively.

[0054] like Figure 2 As shown, the moving groove 11 is connected to the upper bottom surface of the outer tube 10, and the inner tube 20 is separated from the outer tube 10 by moving along the moving groove 11 toward the upper bottom surface of the outer tube 10 through the first stopper 21. By setting the inner tube 20 and the outer tube 10 as a separable structure, it is convenient to assemble the inner tube 20 and the outer tube 10, and it is also convenient to repair the teaching stick 1 for teaching.

[0055] like Figure 1 and Figure 4As shown, the outer tube 10 is provided with a clamping member 30, which is arranged on the outer side of the outer tube 10 and away from the moving groove 11. The clamping member 30 is arranged away from the moving groove 11, so that the clamping member 30 will not interfere with the movement of the first limiter 21 on the inner tube 20 in the moving groove 11, thereby ensuring the stability of the teaching stick 1 when adjusting the length. In the utility model, the clamping member 30 can be directly fixed on the outer tube 10, and the clamping member 30 can also be installed on the outer tube 10 by some detachable methods in the prior art. The clamping member 30 is used to place some teaching supplies such as laser pens, which provides convenience for teaching.

[0056] like Figure 4 As shown, the inner tube 20 is provided with a second stopper 40, and the second stopper 40 and the clamping member 30 are on the same straight line in the axial direction of the outer tube 10. By providing the second stopper 40, when the inner tube 20 is retracted back into the outer tube 10, the second stopper 40 can further fix some teaching supplies on the clamping member 30, thereby improving the stability of the teaching supplies placed in the clamping member 30.

[0057] It is understandable that the second stopper 40 can be directly fixed on the inner tube 20. The second stopper 40 can also be sleeved on the inner tube 20 and move up and down on the inner tube 20. If the second stopper 40 is sleeved on the inner tube 20, the second stopper 40 can be directly removed when the second stopper 40 is not needed.

[0058] like Figure 5 As shown, the teaching stick 1 for teaching does not have the clamping member 30 and the second stopper 40. The teaching stick 1 for teaching in this structure can also be adjusted in normal length and indicate the teaching plan on the blackboard or electronic display screen.

[0059] The clamping member 30 may be a square structure with an opening.

[0060] The clamping member 30 may also be a circular or arc-shaped structure. The clamping member 30 is elastic, and when the laser pen needs to be clamped, the laser pen can be directly placed in the clamping member 30 to fix the laser pen.

[0061] In some embodiments, the clamp 30 is elastic and is a circular structure with an opening. When the clamp 30 is used to place the laser pen, the opening of the clamp 30 can be pulled open to both sides and the laser pen can be placed in the clamp 30 through the opening. Then, the tension on the opening of the clamp 30 is released, and the clamp 30 can be restored to its original state to clamp the laser pen. In this way, the elasticity of the elastic member can be used to clamp the laser pen, making the assembly of the laser pen simpler and more convenient.

[0062] Preferably, the clamping member 30 is a rubber member.

[0063] like Figure 4As shown, the second position-limiting member 40 is provided with a through hole 41, and the through hole 41 is aligned with the clamping member 30. When the teaching stick is in use and the clamping member 30 holds a laser pen, the through hole 41 can avoid the laser beam of the laser pen to avoid affecting the normal operation of the laser pen. In addition, when the teaching stick is not in use, the inner tube 20 can be retracted into the slot of the outer tube 10, and the second position-limiting member 40 will move toward the clamping member 30 along with the inner tube 20. When the inner tube 20 is completely retracted to the outer tube 10, the second position-limiting member 40 can cooperate with the clamping member 30 to further limit the laser pen and improve the stability of the laser pen installed on the clamping member 30.

[0064] The above describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A teaching stick (1), comprising an outer tube (10) and an inner tube (20), wherein the outer tube (10) is provided with a slot, wherein the slot extends from the upper bottom surface of the outer tube (10) to the lower bottom surface of the outer tube (10), and the lower bottom surface of the inner tube (20) is installed in the outer tube (10) through the slot, characterized in that: The outer tube (10) is provided with a movable groove (11) and at least one limiting groove (12); the movable groove (11) is arranged along the axial direction of the outer tube (10), and the movable groove (11) is connected to the slot; the limiting groove (12) is arranged along the radial direction of the outer tube (10), and the limiting groove (12) is arranged at one end of the movable groove (11) close to the upper bottom surface of the outer tube (10), and the limiting groove (12) is connected to the movable groove (11); At least one first limiting member (21) is provided on the inner tube (20), and the first limiting member (21) is slidably installed in the movable groove (11). The inner tube (20) moves in the slot through the cooperation between the first limiting member (21) and the movable groove (11); the first limiting member (21) limits the relative movement between the inner tube (20) and the outer tube (10) by sliding into the limiting groove (12).

2. The teaching stick (1) as claimed in claim 1, characterized in that: There are a plurality of the limiting grooves (12), and the plurality of limiting grooves (12) are arranged along the axial direction of the outer tube (10), and each of the limiting grooves (12) is connected to the movable groove (11) respectively.

3. The teaching stick (1) as claimed in claim 2, characterized in that: The plurality of limiting grooves (12) are arranged on the same side of the movable groove (11).

4. The teaching stick (1) as claimed in claim 2, characterized in that: The plurality of limit grooves (12) are symmetrically arranged on both sides of the movable groove (11).

5. The teaching stick (1) for teaching as claimed in claim 1, characterized in that: The limiting groove (12) comprises a guide section (121) and a limiting section (122); one end of the guide section (121) is connected to the movable groove (11), and the other end of the guide section (121) is connected to the limiting section (122); the minimum distance from the guide section (121) to the upper bottom surface of the inner tube (20) is c, the minimum distance from the side of the guide section (121) connected to the movable groove (11) to the upper bottom surface of the inner tube (20) is a, and the minimum distance from the side of the guide section (121) connected to the limiting section (122) to the upper bottom surface of the inner tube (20) is b, and a, b and c satisfy the following conditions: c>a and c>b.

6. The teaching stick (1) as claimed in claim 5, characterized in that: The guiding section (121) is an arc-shaped structure or a U-shaped structure; and / or the first limiting member (21) is a limiting column, and the limiting section (122) is a circular structure.

7. The teaching stick (1) for teaching as claimed in claim 1, characterized in that: The number of the first limiting members (21) is plural, and the plurality of the first limiting members (21) are arranged along the radial direction of the inner tube (20), and the distance between two adjacent first limiting members (21) is the same as the distance between two adjacent limiting grooves (12).

8. The teaching stick (1) as claimed in claim 1, characterized in that: The movable groove (11) is in communication with the upper bottom surface of the outer tube (10), and the first limiting member (21) moves along the movable groove (11) toward the upper bottom surface of the outer tube (10), so that the inner tube (20) and the outer tube (10) are separated.

9. The teaching stick (1) for teaching as claimed in claim 1, characterized in that: The outer tube (10) is provided with a clamping member (30), and the clamping member (30) is arranged on the outside of the outer tube (10) and away from the moving groove (11); And / or, a second position-limiting member (40) is provided on the inner tube (20), and the second position-limiting member (40) and the clamping member (30) are on the same straight line in the axial direction of the outer tube (10).

10. The teaching stick (1) as claimed in claim 9, characterized in that: The clamping member (30) is a circular structure or an arc-shaped structure; And / or, the second limiting member (40) is provided with a through hole (41), and the through hole (41) is aligned with the clamping member (30).

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