Nasal cavity teaching model

Abstract

The invention relates to the field of teaching model equipment, in particular to a nasal cavity teaching model which comprises a whole model body, the whole model body is a complete skull composed of a frontal bone, a parietal bone, a temporal bone, a cheekbone, an occipital bone and a butterfly bone, a nasal cavity body is installed in the front face of the whole model body, and a nose model is arranged outside the nasal cavity body. A nose model is arranged outside a nasal cavity main body, the nasal cavity main body is inserted into a whole model, an open groove attached to the nasal cavity main body is formed in the whole model, the outer side of the nasal cavity main body is made of a transparent material, and an internal nasal cavity structure can be directly seen; a nasal cavity is formed in the nasal cavity main body, and an upper nasal meatus, a middle nasal meatus and a lower nasal meatus are arranged in the nasal cavity; the upper turbinate, the middle turbinate and the lower turbinate are arranged among the upper nasal meatus, the middle nasal meatus and the lower nasal meatus, the internal structure of the nasal cavity body can be conveniently and rapidly known, and the nasal cavity body can be conveniently placed into the whole model through the clamping blocks.

Description

Technical Field

[0001] This invention relates to the field of teaching model equipment, specifically a nasal cavity teaching model. Background Technology

[0002] The nasal cavity is an important part of the human respiratory system and a core operating area for otolaryngology diagnosis, treatment, and nursing. Its internal structure is complex, containing multiple delicate anatomical structures such as nasal bones, turbinates, nasal passages, sinuses, and nasal mucosa. In medical teaching, nursing training, and practical training for primary healthcare personnel, the head and nasal cavity teaching model is an indispensable core teaching tool. Its core function is to replace real human specimens, intuitively demonstrate the anatomical structure and physiological characteristics of the nasal cavity, simulate clinical operation scenarios, and help learners quickly master the structural distribution, physiological functions, and related diagnosis, treatment, and nursing operation skills of the nasal cavity, reduce the risks of real human training, and improve teaching and training efficiency. Existing head teaching models, such as the head teaching model with publication number CN210606281U, include a left head model and a right head model that are a single unit when not in use. During teaching, the left and right head models can be separated to allow for teaching of their internal structures. This makes the head teaching model suitable for teaching not only the surface of the head but also its internal structure. The rotating bolt can slide threadedly through the first and second connecting slots. When the bolt threads slide out of the first and second connecting slots, it can pull the left and right head models to move. When the left and right head models move, they can also move the fixing slot and fixing block. When the fixing block moves out of the fixing slot, the left and right head models can be opened for quick disassembly. However, existing teaching models cannot clearly demonstrate the internal structure of the nasal cavity, which cannot be disassembled from the main body. At the same time, they also cannot demonstrate the skull separately, further reducing the efficiency of teaching. Summary of the Invention

[0003] A nasal cavity teaching model is provided. This device can provide a more three-dimensional observation method by unfolding different skull structures outward, thereby improving the teaching quality. Furthermore, the transparent and detachable nasal cavity enhances the observation of the internal structures of the nasal cavity.

[0004] A nasal cavity teaching model includes a model body, which is a complete skull composed of the frontal bone, parietal bone, temporal bone, zygomatic bone, occipital bone, and sphenoid bone. A nasal cavity body is installed on the front of the model body, and a nose model is set on the outside of the nasal cavity body. The nasal cavity body is inserted into the model body. The model body has a slot inside that fits the nasal cavity body. The outer side of the nasal cavity body is made of transparent material. A model base is set at the lower end of the model body. A mounting post is fixedly set inside the model base. A mounting shell is fixedly connected to the upper end of the mounting post. The mounting shell is circular in shape. A rotating block is installed in the middle of the mounting shell. The upper and lower edges of the rotating block are beveled. A snap-fit ​​block is set on the side of the nasal cavity body near the mounting post. A snap-fit ​​slot is set on the upper end of the snap-fit ​​block. A locking strip is set on the mounting post. Preferably, the nasal cavity body is provided with a nasal cavity inside, and the nasal cavity is provided with an upper nasal meatus, a middle nasal meatus, and an inferior nasal meatus. Preferably, the mounting housing has an upper ring groove and a lower ring groove on the inclined surface corresponding to the rotating block, and one end of the connecting rod inside the limiting sleeve extends into the upper ring groove and the lower ring groove and contacts the outside of the rotating block. Preferably, an inclined block is provided on the outer inclined surface of the rotating block, one side of the inclined block is arc-shaped, and a baffle and a flat segment are provided at the top of the end of the inclined block away from the rotating block; Preferably, the outer side of the case shell is provided with a limiting sleeve, which is respectively positioned towards the frontal bone, parietal bone, temporal bone, zygomatic bone, and occipital bone; Preferably, the limiting sleeve is provided with multiple sleeves on the outside of the mounting shell, and the frontal bone connecting rod, parietal bone connecting rod, temporal bone connecting rod, zygomatic bone connecting rod, occipital bone connecting rod, and frontal bone connecting rod are installed inside the sleeve. Preferably, one end of the corresponding limiting spring of the parietal bone link, temporal bone link, zygomatic bone link, and occipital bone link is provided with an annular limiting piece; Preferably, the locking bar is positioned above the locking block and has a locking block installed inside it. The locking block is tilted to one side, with sliders connected to both sides of the locking block and a counterweight at the top. Preferably, the lower end of the locking block extends through the locking strip, a control rod is sleeved inside the mounting column, the upper end of the control rod extends to the lower end of the rotating block, and a connecting rod is provided at the bottom of the rotating block; Preferably, the frontal bone, parietal bone, temporal bone, zygomatic bone, and occipital bone are provided with connecting grooves at the positions of the frontal bone connecting rod, parietal bone connecting rod, temporal bone connecting rod, zygomatic bone connecting rod, and occipital bone connecting rod, respectively. One end of the connecting rod enters the interior of the connecting groove, and a magnetic block two is provided at one end of the connecting groove. A magnetic block one is provided inside the connecting groove.

[0005] Compared with the prior art, the present invention has the following beneficial effects: 1. A model base is provided at the bottom of the model body. A mounting column is fixedly installed inside the model base. A mounting shell is fixedly connected to the upper end of the mounting column. The mounting shell is circular in shape. Limiting sleeves are provided on the outer side of the mounting shell, with each limiting sleeve facing the frontal bone, parietal bone, temporal bone, zygomatic bone, and occipital bone respectively. Multiple limiting sleeves are provided on the outer side of the mounting shell. A frontal bone connecting rod is installed in the limiting sleeve facing the frontal bone, a parietal bone connecting rod is installed in the limiting sleeve facing the parietal bone, a temporal bone connecting rod is installed in the limiting sleeve facing the temporal bone, and a zygomatic bone connecting rod is installed in the limiting sleeve facing the zygomatic bone. The rod, with an occipital bone connecting rod installed inside the limiting sleeve facing the occipital bone, has a limiting spring installed inside the limiting sleeve. The frontal bone connecting rod, parietal bone connecting rod, temporal bone connecting rod, zygomatic bone connecting rod, and occipital bone connecting rod have annular limiting plates at one end of the limiting spring. When the user rotates the control rod, it can drive the rotating block to rotate inside the mounting shell, so that the curved side of the inclined block on the outside of the rotating block contacts one end of the connecting rod. As the rotating block continues to rotate, the connecting rod can gradually squeeze the limiting spring along the curved surface of the inclined block and move outward, thus showing the frontal bone, parietal bone, temporal bone, zygomatic bone, and occipital bone being pushed outward, achieving the effect of unfolding and displaying different parts of the skull.

[0006] 2. A nose model is mounted on the outside of the main nasal cavity body. The main nasal cavity body is inserted into the overall model. The interior of the overall model has slots that fit the main nasal cavity body. The outer side of the main nasal cavity body is made of transparent material, allowing direct viewing of the internal nasal cavity structure. The nasal cavity is located inside the main nasal cavity body, containing the superior, middle, and inferior nasal meatuses. The superior, middle, and inferior turbinates are located between the superior, middle, and inferior nasal meatuses. A snap-fit ​​block is located on the side of the main nasal cavity body near the mounting post, with a snap-fit ​​groove at its upper end. A locking strip is located on the mounting post, positioned above the snap-fit ​​block, and contains a locking block installed inside. The locking block is tilted to one side. The device features a locking block with sliders on both sides and a counterweight at the top. The lower end of the locking block extends through the locking strip, allowing the nasal cavity body to be pulled outwards. This allows the upper, middle, and lower nasal passages to be directly displayed through transparent material, facilitating a quick understanding of the internal structure of the nasal cavity body. The locking mechanism also allows the nasal cavity body to be easily placed inside the model, contacting the locking block and moving it upwards. The locking block then resets, locking the nasal cavity body in place and preventing it from falling out when not in use. Pushing the control lever upwards moves the locking strip upwards, unlocking the nasal cavity body.

[0007] 3. Connecting grooves are provided at the positions of the frontal, parietal, temporal, zygomatic, and occipital bones corresponding to the frontal, parietal, temporal, zygomatic, and occipital bone connecting rods. One end of the connecting rod enters the connecting groove, and a magnetic block two is provided at the end corresponding to the connecting groove. A magnetic block one is provided inside the connecting groove, so that the head bone structure can be connected to the connecting rod by magnetic attraction between magnetic block two and magnetic block one. After unfolding, the bone structure can be removed separately by separating magnetic block two and magnetic block one, so as to facilitate individual explanation and learning. Attached Figure Description

[0008] Figure 1 This is a three-dimensional front view of the present invention; Figure 2 This is an overall unfolded view of the invention; Figure 3 This is a side perspective view of the overall model of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 For the present invention Figure 4 Enlarged view at point B in the middle; Figure 6 For the present invention Figure 3 Enlarged view at point C; Figure 7 This is a top perspective view of the mounting housing; Figure 8 For the present invention Figure 7 Enlarged view at point D; Figure 9 This is a perspective view of the rotating block of the present invention. Figure 1-9 In the middle section: 1-Model as a whole, 101-Model base, 2-Nasal cavity body, 201-Nose model, 202-Nasal cavity, 203-Superior nasal meatus, 204-Middle nasal meatus, 205-Inferior nasal meatus, 206-Connecting block, 3-Front frontal bone, 301-Front frontal bone connecting rod, 4-Parietal bone, 401-Parietal bone connecting rod, 5-Temporal bone, 501-Temporal bone connecting rod, 6-Zygomatic bone, 601-Zygomatic bone connecting rod, 7-Occipital bone, 701-Occipital bone connecting rod, 8-Sphenoid bone, 9-Mounting column 10-Control lever, 11-Mounting housing, 1101-Upper ring groove, 1102-Lower ring groove, 12-Limit sleeve, 13-Limit spring, 14-Annular limit piece, 15-Rotating block, 1501-Connecting rod, 1502-Inclined block, 1503-Baffle, 1504-Plane section, 16-Locking strip, 17-Locking block, 1701-Counterweight block, 18-Contact head, 19-Connecting groove, 1901-Magnetic block one, 20-Magnetic block two Detailed Implementation

[0009] Please see Figures 1 to 9A schematic diagram of the planar structure and a schematic diagram of the three-dimensional structure of a nasal cavity teaching model.

[0010] A nasal cavity teaching model includes a model body 1, which is a complete skull composed of frontal bone 3, parietal bone 4, temporal bone 5, zygomatic bone 6, occipital bone 7, and sphenoid bone 8. A nasal cavity body 2 is installed in the front of the model body 1. A nose model 201 is set outside the nasal cavity body 2. The nasal cavity body 2 is inserted into the model body 1. The model body 1 has a slot that fits the nasal cavity body 2. The outside of the nasal cavity body 2 is made of transparent material so that the internal nasal cavity structure can be directly seen. In specific implementation, the nasal cavity body 2 is provided with a nasal cavity 202, and the nasal cavity 202 is provided with a superior nasal meatus 203, a middle nasal meatus 204, and a inferior nasal meatus 205. The superior turbinate, the middle turbinate, and the inferior turbinate are provided between the superior nasal meatus 203, the middle nasal meatus 204, and the inferior nasal meatus 205. In the actual real-time configuration, a model base 101 is provided at the lower end of the model body 1. A mounting post 9 is fixedly installed inside the model base 101. A mounting shell 11 is fixedly connected to the upper end of the mounting post 9. The mounting shell 11 is circular in shape. Limiting sleeves 12 are provided on the outer side of the mounting shell 11. The limiting sleeves 12 are respectively positioned facing the frontal bone 3, parietal bone 4, temporal bone 5, zygomatic bone 6, and occipital bone 7. Multiple limiting sleeves 12 are provided on the outer side of the mounting shell 11. A frontal bone connecting rod 301 is installed in the limiting sleeve 12 facing the frontal bone 3. The mounting shell 11 facing the parietal bone... A parietal bone connecting rod 401 is installed in the limiting sleeve 12 on one side of the mounting shell 11 facing the temporal bone 5. A temporal bone connecting rod 501 is installed in the limiting sleeve 12 on the side of the mounting shell 11 facing the zygomatic bone 6. An occipital bone connecting rod 701 is installed in the limiting sleeve 12 on the side of the mounting shell 11 facing the occipital bone 7. A limiting spring 13 is installed inside the limiting sleeve 6. A ring-shaped limiting piece 14 is provided at one end of the frontal bone connecting rod 301, parietal bone connecting rod 401, temporal bone connecting rod 501, zygomatic bone connecting rod 601, and occipital bone connecting rod 701 corresponding to the limiting spring 13. In a specific implementation, a rotating block 15 is installed in the middle of the inner part of the mounting shell 11. The upper and lower edges of the rotating block 15 are set with slopes. The inner part of the mounting shell 11 is provided with an upper ring groove 1101 and a lower ring groove 1102 corresponding to the slope of the rotating block 15. One end of the connecting rod in the limiting sleeve 12 extends into the upper ring groove 1101 and the lower ring groove 1102 and contacts the outside of the rotating block 15. An inclined block 1502 is provided on the outer slope of the rotating block 15. One side of the inclined block 1502 is arc-shaped. The top of the end of the inclined block 1502 away from the rotating block 15 is provided with a baffle 1503 and a flat section 1504. The inclined block 1502 enters the upper ring groove 1101 and the lower ring groove 1102 and is respectively set on one side of the frontal bone connecting rod 301, the parietal bone connecting rod 401, the temporal bone connecting rod 501, the zygomatic bone connecting rod 601, and the occipital bone connecting rod 701.

[0011] In specific implementation, a snap-fit ​​block 206 is provided on the side of the nasal cavity body 2 near the mounting post 9. The snap-fit ​​block 206 has a snap-fit ​​groove at its upper end. A locking strip 16 is provided on the mounting post 9. The locking strip 16 is located above the snap-fit ​​block 206 and has a snap-fit ​​block 17 installed inside it. The snap-fit ​​block 17 is tilted to one side. Slider blocks are connected to both sides of the snap-fit ​​block 17. A counterweight block 1701 is provided at the upper end. The lower end of the snap-fit ​​block 17 extends out of the locking strip 16. A control rod 10 is sleeved inside the mounting post 9. The upper end of the control rod 10 extends to the lower end of the rotating block 15. A connecting rod 1501 is provided at the bottom of the rotating block 15. A gear groove is provided on the outer side of the connecting rod 1501. The upper end of the control rod 10 is sleeved on the outer side of the connecting rod 1501, and the inner side of the control rod 10 meshes with the outer gear groove.

[0012] In practice, one end of the locking strip 16 extends into the interior of the mounting post 9 and is fitted onto the outside of the control post 10. The control post 10 has an annular groove on its outside, and the mounting post 9 has a slot on its outside for the locking strip 16 to move upward.

[0013] In specific implementation, the frontal bone 3, parietal bone 4, temporal bone 5, zygomatic bone 6, and occipital bone 7 are provided with connecting grooves 19 at the positions of frontal bone connecting rod 301, parietal bone connecting rod 401, temporal bone connecting rod 501, zygomatic bone connecting rod 601, and occipital bone connecting rod 701, respectively. One end of the connecting rod enters the interior of the connecting groove 19, and a magnetic block 20 is provided at one end of the connecting groove 19. A magnetic block 1901 is provided inside the connecting groove 19, and a contact head 18 is provided at one end of the connecting rod. A ball is provided on the contact head 18.

[0014] The working principle of the nasal cavity teaching model of the present invention is as follows.

[0015] First, a model base 101 is set at the lower end of the model body 1. A mounting post 9 is fixedly installed inside the model base 101. A mounting shell 11 is fixedly connected to the upper end of the mounting post 9. The mounting shell 11 is circular in shape. Limiting sleeves 12 are set on the outer side of the mounting shell 11. The limiting sleeves 12 are positioned facing the frontal bone 3, parietal bone 4, temporal bone 5, zygomatic bone 6, and occipital bone 7 respectively. Multiple limiting sleeves 12 are set on the outer side of the mounting shell 11. A frontal bone connecting rod 301 is installed in the limiting sleeve 12 facing the frontal bone 3, a parietal bone connecting rod 401 is installed in the limiting sleeve 12 facing the parietal bone 4, a temporal bone connecting rod 501 is installed in the limiting sleeve 12 facing the temporal bone 5, and a zygomatic bone connecting sleeve 501 is installed in the limiting sleeve 12 facing the temporal bone 5. A zygomatic bone connecting rod 601 is installed inside the limiting sleeve 12 on one side of the mounting shell 11 facing the occipital bone 7. An occipital bone connecting rod 701 is installed inside the limiting sleeve 12 on the side of the mounting shell 11 facing the occipital bone 7. A limiting spring 13 is installed inside the limiting sleeve 6. A ring-shaped limiting piece 14 is provided at one end of the frontal bone connecting rod 301, parietal bone connecting rod 401, temporal bone connecting rod 501, zygomatic bone connecting rod 601, and occipital bone connecting rod 701 corresponding to the limiting spring 13. When the user rotates the control rod 10, it can drive the rotating block 15 to rotate inside the mounting shell 11, so that the arc-shaped side of the inclined block 1502 on the outside of the rotating block 15 contacts one end of the connecting rod. As the rotating block 15 continues to rotate, the connecting rod can gradually squeeze the limiting spring 13 along the arc surface of the inclined block 1502 and move outward, thereby showing the frontal bone 3, The parietal bone 4, temporal bone 5, zygomatic bone 6, and occipital bone 7 protrude outwards, achieving the effect of displaying different parts of the skull. Next, a nose model 201 is set outside the nasal cavity main body 2. The nasal cavity main body 2 is inserted into the model body 1. The model body 1 has a slot inside that fits the nasal cavity main body 2. The outer side of the nasal cavity main body 2 is made of transparent material, allowing direct viewing of the internal nasal cavity structure. A nasal cavity 202 is set inside the nasal cavity main body 2. The nasal cavity 202 contains the superior nasal meatus 203, middle nasal meatus 204, and inferior nasal meatus 205. The superior, middle, and inferior nasal conchas are located between the superior, middle, and inferior nasal meatuses 203, 204, and 205. A snap-fit ​​block 206 is set on the side of the nasal cavity main body 2 near the mounting post 9. The snap-fit ​​block 206 has a slot at its upper end. The mounting post 9... A locking strip 16 is provided above the locking block 206, and a locking block 17 is installed inside it. The locking block 17 is tilted to one side, and sliders are connected to both sides of the locking block 17. A counterweight block 1701 is provided at the upper end. The lower end of the locking block 17 extends out of the locking strip 16, allowing the nasal cavity body 2 to be pulled outward. This allows the superior nasal passage 203, middle nasal passage 204, and inferior nasal passage 205 to be directly displayed to the outside through transparent material, facilitating a quick understanding of the internal structure of the nasal cavity body 2. Furthermore, the locking block 206 allows the nasal cavity body 2 to be easily placed into the model body 1, contacting the locking block 17 and driving it upward. Then, as the locking block 17 resets, it locks the nasal cavity body, preventing it from falling outward when not in use.When the control lever 10 is pushed upward, it moves the locking strip 16 upward, unlocking the nasal cavity body 2. Connecting grooves 19 are provided at the positions of the frontal bone 3, parietal bone 4, temporal bone 5, zygomatic bone 6, and occipital bone 7, corresponding to the frontal bone connecting rod 301, parietal bone connecting rod 401, temporal bone connecting rod 501, zygomatic bone connecting rod 601, and occipital bone connecting rod 701. One end of the connecting rod enters the connecting groove 19, and a magnetic block 20 is provided at one end of the connecting groove 19. A magnetic block 1901 is provided inside the connecting groove 19, allowing the two magnetic blocks 20 and 1901 to be magnetically attracted, thus connecting the head bone structure to the connecting rod. Furthermore, after unfolding, the magnetic block 20 can be used to connect the head bone structure to the connecting rod. Separating the 20 from the magnetic block 1901 allows for the individual removal of the bone structure, facilitating separate explanation and learning. A contact head 18 with a ball bearing is located at one end of the connecting rod. When the contact head 18 contacts the inclined block 1502, the ball bearing reduces friction, improving the efficiency of the connecting rod's outward extension. Furthermore, a baffle 1503 and a flat section 1504 are located at the top of the inclined block 1502, away from the rotating block 15. This allows the connecting rod to stop on the flat section 1504 after extending a predetermined length, preventing continuous force on the control rod 10. The baffle 1503 also prevents over-rotation and the connecting rod from falling, improving the overall reliability of the device.

Claims

1. A nasal cavity teaching model, comprising a head composed of the model body (1), frontal bone (3), parietal bone (4), temporal bone (5), zygomatic bone (6), occipital bone (7), and sphenoid bone (8), characterized in that: The model body (1) has a nasal cavity body (2) installed on the front. The nasal cavity body (2) has a nose model (201) on its outside. The nasal cavity body (2) is inserted into the model body (1). The model body (1) has a slot that fits the nasal cavity body (2) inside. The outside of the nasal cavity body (2) is made of transparent material. The model body (1) has a model base (101) at the lower end. A mounting column (9) is fixedly installed inside the model base (101). A mounting shell (11) is fixedly connected to the upper end of the mounting column (9). The mounting shell (11) is circular in shape. A rotating block (15) is installed in the middle of the interior of the mounting shell (11). The upper and lower edges of the rotating block (15) are beveled. A limiting sleeve (12) is provided on the outside of the shell (11). The limiting sleeve (12) faces the frontal bone (3), parietal bone (4), and temporal bone (5), respectively. The direction of the bone (5), zygomatic bone (6), and occipital bone (7) is set. The limiting sleeve (12) is provided with multiple ones on the outside of the mounting shell (11), and the frontal bone connecting rod (301), parietal bone connecting rod (401), temporal bone connecting rod (501), zygomatic bone connecting rod (601), occipital bone connecting rod (701), and frontal bone connecting rod (301) are installed inside. The nasal cavity body (2) is provided with a snap-fit ​​block (206) on the side near the mounting post (9). The snap-fit ​​block (206) is provided with a snap-fit ​​groove at the upper end. The mounting post (9) is provided with a locking strip (16).

2. The nasal cavity teaching model according to claim 1, characterized in that: The mounting housing (11) has an upper ring groove (1101) and a lower ring groove (1102) on the inclined surface corresponding to the rotating block (15). One end of the connecting rod in the limiting sleeve (12) extends into the upper ring groove (1101) and the lower ring groove (1102) and contacts the outside of the rotating block (15).

3. The nasal cavity teaching model according to claim 1, characterized in that: An inclined block (1502) is provided on the outer inclined surface of the rotating block (15). One side of the inclined block (1502) is arc-shaped. A baffle (1503) and a flat section (1504) are provided on the top of the end of the inclined block (1502) away from the rotating block (15).

4. The nasal cavity teaching model according to claim 1, characterized in that: One end of the corresponding limiting spring (13) of the parietal bone link (401), temporal bone link (501), zygomatic bone link (601), and occipital bone link (701) is provided with an annular limiting piece (14).

5. A nasal cavity teaching model according to claim 1, characterized in that: The locking bar (16) is positioned above the locking block (206) and has a locking block (17) installed inside. The locking block (17) is tilted to one side, and sliders are connected to both sides of the locking block (17). A counterweight (1701) is provided at the top.

6. A nasal cavity teaching model according to claim 5, characterized in that: The lower end of the locking block (17) extends through the inside of the locking strip (16), and the control rod (10) is sleeved inside the mounting column (9). The upper end of the control rod (10) extends to the lower end of the rotating block (15), and the bottom of the rotating block (15) is provided with a connecting rod (1501).

7. A nasal cavity teaching model according to claim 1, characterized in that: The frontal bone (3), parietal bone (4), temporal bone (5), zygomatic bone (6), and occipital bone (7) are provided with connecting grooves (19) at the positions of the frontal bone connecting rod (301), parietal bone connecting rod (401), temporal bone connecting rod (501), zygomatic bone connecting rod (601), and occipital bone connecting rod (701).

8. A nasal cavity teaching model according to claim 7, characterized in that: One end of the connecting rod enters the interior of the connecting groove (19), and a magnetic block two (20) is provided at one end of the connecting groove (19), and a magnetic block one (1901) is provided inside the connecting groove (19).

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