Holographic immersion type device

Through structural optimization of the holographic immersive device, personnel isolation, heat dissipation tank sealing, and stable device movement were achieved, solving the problems of immersive effect during public display and dust during storage, and ensuring the stability and service life of the device.

CN121879074APending Publication Date: 2026-04-17NANYANG INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANYANG INST OF TECH
Filing Date
2023-06-25
Publication Date
2026-04-17

AI Technical Summary

Technical Problem

Existing holographic immersive devices suffer from poor immersive viewing experience due to the crowds when displayed in public places, dust easily gets in when the devices are stored, and they are unstable when moved or fixed.

Method used

The design incorporates moving parts, auxiliary parts, supporting parts, and a base. By pulling the control panel and control lever, personnel isolation, heat dissipation trough sealing, and device fixation are achieved. Rubber contact heads are used for anti-slip, and pulleys facilitate easy movement.

Benefits of technology

It enhances the immersive viewing experience, prevents dust from entering, and ensures the stability and secureness of the device during storage and movement.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention provides a holographic immersion type device, and relates to the field of holographic equipment, the holographic immersion type device comprises a supporting piece, the supporting piece is of a T-shaped structure, a driving groove is formed in the supporting piece, the driving groove is of an L-shaped structure, the side edge of the driving groove is of an inclined structure, the two sides of the supporting piece are each provided with a U-shaped plate, and the outer side of the top end of each moving rod is provided with a pull rod. When the protective part needs to be stored or not used, the control rod is directly pulled to move, the stress rod moves in the driving groove, the transmission plate moves transversely, the moving rod is pushed to move together in a guiding mode during transverse displacement, the pull rod continuously moves in the inner groove, and due to the fact that the inner groove is of an inclined structure, the protective part is controlled to ascend conveniently and rapidly. According to the holographic immersion type device, the heat dissipation grooves are blocked, so that dust cannot enter the device through the heat dissipation grooves when the main body is stored or not used, and the problem that the service life is affected due to the fact that dust easily enters the device through the heat dissipation grooves when an existing holographic immersion type device is used is solved.
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Description

Technical Field

[0001] This invention relates to the field of holographic equipment technology, and in particular to a holographic immersive device. Background Technology

[0002] When conducting multimedia and smart media communication, holographic immersive devices are often used to project and display images, thereby enhancing the publicity and viewing experience.

[0003] When existing holographic immersive devices are used, if they are displayed in public places where there are many people, the immersive viewing experience is affected. In addition, the sides of the devices are usually equipped with heat dissipation slots, which can easily allow dust to enter the device during storage, affecting its lifespan. The devices are usually moved by casters, but when the devices are fixed, they are prone to displacement when they are hit. Even if the casters have a locking mechanism, the devices will still experience slight displacement. Summary of the Invention

[0004] In view of this, the present invention provides a holographic immersive device to solve the problem that existing holographic immersive devices, when displayed in public places where there are many people, cannot achieve the desired immersive viewing experience.

[0005] This invention provides a holographic immersive device, specifically comprising: a main body; the main body is a holographic immersive projector body, with a 3D holographic projection glass at the top of the main body, two top components mounted on each side of the top of the main body, with movable components slidably mounted on the top components, and flocked black cloth on the inner side of the movable components, a total of two movable components, each with two T-shaped heads on its inner side, and an auxiliary component at the front end of the two movable components, the auxiliary component having a trumpet-shaped structure, and flocked black cloth on its inner side; a support component, the support component having a T-shaped structure, fixed to the bottom of the main body, and having a driving groove inside the support component for driving... The groove has an L-shaped structure, and the sides of the drive groove are inclined. A U-shaped plate is provided on each side of the support member. A movable rod is slidably fitted onto the outside of each U-shaped plate. A pull rod with a cylindrical structure is provided on the outer side of the top of each movable rod. The bottom member has a rectangular structure and is fixed to the bottom of the support member. Four auxiliary heads are provided at the top of the bottom member. T-shaped grooves are provided inside the auxiliary heads and the bottom member. A pressure block and a movable head are inserted into each T-shaped groove. The pressure block is fixed to the top of the movable head, and a sliding groove is provided inside the pressure block. A rotatable pulley is installed at the bottom of each movable head.

[0006] Optionally, the main body has a side groove on each side, and each side groove has evenly arranged heat dissipation grooves inside. A guide plate with a T-shaped plate structure is located at the bottom center of both the front and rear ends of the main body. The top member has an inverted U-shaped structure and is made of metal. A T-shaped head is inserted inside each top member. A square plate is located on the outer rear end of each moving member, and a round hole is located inside each square plate. A sliding groove with a rectangular structure is located at the bottom rear end of each moving member, and there are two sliding grooves in total. A control plate with a rectangular structure is slidably inserted inside the two sliding grooves. Each control plate has a round hole at each end, and a guide rod is located on each side of the top of the control plate. The rear of the guide rod is rectangular, and the front end of the guide rod is a T-shaped shaft structure. A spring is fitted on the outer side of each guide rod, and the guide rod is inserted into the round hole of the square plate.

[0007] Optionally, a force-bearing rod is inserted inside the drive groove. The force-bearing rod has a cylindrical structure, and a transmission plate is provided at each end of the force-bearing rod. The transmission plate has a T-shaped structure, and there are two transmission plates in total. A control rod is provided at the front end of each transmission plate. A connecting block with a U-shaped structure is provided at the bottom of each transmission plate. A rectangular plate with a circular hole is provided inside each rectangular plate. A push groove with the top of the connecting block is inserted into the push groove. The moving rod has a Z-shaped structure. A protective member with a rectangular structure and made of plastic is slidably connected to the top of each moving rod. The top of the protective member is embedded in the bottom of the side groove. There are two protective members in total, and the two protective members are connected by two long rods. A long groove with a guide plate is slidably inserted inside each long groove. A groove with a moving rod is provided inside each protective member. An inner groove with an inclined structure is provided inside each inner groove. A pull rod is slidably inserted inside each inner groove.

[0008] Optionally, the auxiliary head has a rectangular structure, and each auxiliary head has a control groove on both sides, which is inclined. The bottom of the base has eight contact heads, which are rectangular and made of rubber. A control lever is inserted into every two control grooves. The control lever is U-shaped and is inserted into the sliding groove. Both ends of the control lever are cylindrical. A transmission block is provided on the inner side of each control lever. The transmission block is rectangular and has a transmission groove at its top. A connecting block is inserted into the transmission groove. A slide rod is provided on the side of each transmission block. The bottom of the slide rod is rectangular and the top of the slide rod is a T-shaped shaft. A spring is fitted on the outer side of each slide rod, which is inserted into the circular hole of the rectangular plate.

[0009] The beneficial effects are:

[0010] 1. By setting up moving parts and auxiliary parts, when people are immersing themselves in the movie, they can directly pull the control plate to move and displace it. This allows the control plate to move inside the slide, thereby detaching it from the top of the main body. This releases the moving parts and auxiliary parts from their fixation, allowing the moving parts to block the sides of the main body and the auxiliary parts to block the front of the main body. This allows people to immerse themselves in the movie through the front of the auxiliary parts, thus isolating other people and enabling them to watch the movie alone, improving the immersive viewing experience.

[0011] 2. By setting up a drive groove and a pull rod, when the device needs to be stored or is not in use, the control rod can be pulled to move, thereby allowing the force rod to move inside the drive groove and move to the front end of the drive groove and fix it. This allows the transmission plate to move laterally. During its lateral movement, the moving rod can be pushed to guide the movement, causing the moving rod to move together with the pull rod. The pull rod can move continuously inside the inner groove. Because the inner groove has an inclined structure, the protective part can be easily raised and embedded into the side groove, thereby blocking the heat dissipation groove. This prevents dust from entering through the heat dissipation groove when the main body is stored or not in use.

[0012] 3. By setting up a pressure block and a moving head, when the device needs to be fixed, the control lever can be pressed down to move it, allowing the force-bearing rod to displace inside the drive groove. This releases the transmission plate from pressing on the transmission block, allowing the main body to move downwards by gravity. Simultaneously, the control lever moves inside the control groove. Due to the inclined structure of the control groove, the pressure block and moving head can be driven upwards, allowing the contact head at the bottom of the base to contact the ground. Because the contact head is made of rubber, it can make anti-slip contact and fix it to the ground, preventing displacement when the main body encounters an impact. When the main body needs to move, the control lever can be pulled, causing the force-bearing rod to move forward inside the drive groove. Then, the spring pushes the rectangular plate and connecting block upwards, allowing the force-bearing rod to be locked above the front end of the drive groove. The connecting block simultaneously drives the control lever to move, allowing the control lever to displace inside both the sliding groove and the control groove. Due to the inclined structure of the control groove, the moving head and pressure block move downwards together, allowing the pulley at the bottom of the moving head to contact the ground, thus facilitating the displacement of the device and enabling rapid movement. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0014] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0015] In the attached diagram:

[0016] Figure 1 This is a three-dimensional structural diagram of an immersive device according to an embodiment of the present invention.

[0017] Figure 2 This is a bottom-view structural diagram of an immersive device according to an embodiment of the present invention.

[0018] Figure 3 This is an exploded three-dimensional structural diagram of an immersive device according to an embodiment of the present invention.

[0019] Figure 4 This is an exploded bottom view of the immersive device according to an embodiment of the present invention.

[0020] Figure 5 This is a three-dimensional exploded view of the main body of the immersive device according to an embodiment of the present invention.

[0021] Figure 6 This is an exploded three-dimensional structural diagram of the support member of the immersive device according to an embodiment of the present invention.

[0022] Figure 7 This is an exploded three-dimensional structural diagram of the bottom component of the immersive device according to an embodiment of the present invention.

[0023] Figure 8 This is an exploded bottom view of the bottom component of the immersive device according to an embodiment of the present invention.

[0024] List of reference numerals

[0025] 1. Main body; 101. Side groove; 102. Guide plate; 103. Top component; 104. Moving component; 105. Auxiliary component; 106. Slide groove; 107. Control panel; 108. Guide rod;

[0026] 2. Support component; 201. Drive groove; 202. Force-bearing rod; 203. Transmission plate; 204. Connecting block; 205. Moving rod; 206. Pull rod; 207. Protective component; 208. Inner groove;

[0027] 3. Base component; 301. Auxiliary head; 302. Control slot; 303. Pressure block; 304. Moving head; 305. Contact head; 306. Control lever; 307. Transmission block; 308. Slide rod. Detailed Implementation

[0028] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0029] Example: Please refer to Figures 1 to 8 As shown:

[0030] This invention provides a holographic immersive device, comprising a main body 1; the main body 1 is the body of a holographic immersive projector, and a 3D holographic projection glass is provided at the top of the main body 1. Two top members 103 are respectively installed on both sides of the top of the main body 1. Movable members 104 are slidably installed on the top members 103. The inner side of the movable members 104 is covered with flocked black cloth to prevent light from entering. There are two movable members 104 in total, which can be positioned on both sides of the main body 1 to block light. The inner side of each movable member 104 is provided with two T-shaped heads for embedding into the interior of the top member 103 for guiding and sliding. The front end of component 104 is provided with an auxiliary component 105, which has a trumpet-shaped structure to improve the immersive viewing effect. The inner side of the auxiliary component 105 is lined with flocked black cloth. Support component 2 has a T-shaped structure and is fixed to the bottom of the main body 1. Inside the support component 2 is a driving groove 201, which has an L-shaped structure and inclined sides to guide the sliding of the force-bearing rod 202. U-shaped plates are provided on both sides of the support component 2, and each U-shaped plate has a sliding sleeve on its outer side. The movable rods 205 each have a pull rod 206 on their outer top. The pull rod 206 is cylindrical and can be guided to move within the inner groove 208, thus facilitating the movement of the protective component 207. This allows the protective component 207 to block the heat dissipation groove, preventing dust from entering the interior of the main body 1 through the heat dissipation groove. The base component 3 is rectangular and fixed to the bottom of the support component 2. The top of the base component 3 has four auxiliary heads 301. The auxiliary heads 301 and the interior of the base component 3 have T-shaped grooves, and each T-shaped groove is used to insert... The device includes a pressure block 303 and a moving head 304, allowing the pressure block 303 and the moving head 304 to be guided and displaced within the T-shaped groove. The pressure block 303 is fixed to the top of the moving head 304. The pressure block 303 has a sliding groove inside, allowing the control lever 306 to be guided and displaced within it, thereby facilitating the up-and-down movement of the base 3 and allowing the contact head 305 to contact and be fixed to the ground. Each moving head 304 has a rotatable pulley installed at its bottom, allowing the pulley to contact the ground after the base 3 is raised, enabling the main body 1 to move smoothly.

[0031] refer to Figure 5The main body 1 has a side groove 101 on each side, allowing the protective component 207 to be embedded inside. Each side groove 101 has evenly arranged heat dissipation grooves inside to dissipate heat. A guide plate 102 is located at the bottom center of both the front and rear ends of the main body 1. The guide plate 102 is a T-shaped plate structure used to guide displacement within the long groove. The top component 103 has an inverted U-shaped structure and is made of metal. A T-shaped head is inserted inside each top component 103 to control the T-shaped head and guide the movement of the moving component 104. A square plate is located on the outer rear end of each moving component 104, with a round hole inside each square plate. A sliding groove 106 is located at the bottom rear end of each moving component 104. 106 is a rectangular structure, and there are two slides 106 to guide the movement of the control plate 107. A control plate 107 is slidably inserted into the two slides 106. The control plate 107 is a rectangular structure, and each control plate 107 has a round hole at both ends. A guide rod 108 is provided on both sides of the top of the control plate 107. The rear of the guide rod 108 is a rectangular structure, and the front end of the guide rod 108 is a T-shaped shaft structure. A spring is fitted on the outside of each guide rod 108, which can continuously drive the guide rod 108 and the control plate 107 to move together, so that the control plate 107 can be limited at the top of the main body 1, so that the moving part 104 will not move downward. The guide rod 108 is inserted into the round hole of the square plate.

[0032] refer to Figure 6A force-bearing rod 202 is inserted inside the drive groove 201. The force-bearing rod 202 has a cylindrical structure and is used to guide displacement within the drive groove 201. A transmission plate 203 with a T-shaped structure is provided at each end of the force-bearing rod 202. There are two transmission plates 203 in total, and a control rod is provided at the front end of each transmission plate 203. A connecting block 204 with a U-shaped structure is provided at the bottom of each transmission plate 203 for sliding connection with the transmission block 307. A rectangular plate is provided on the side of each connecting block 204, and a circular hole is provided inside each rectangular plate to guide displacement of the sliding rod 308. A pushing groove is provided at the bottom of each moving rod 205, and the top of the connecting block 204 is inserted into the pushing groove. The moving rod 205 has a Z-shaped structure to transmit power, thereby driving the pull rod 206 to move together. The top of each movable rod 205 is slidably connected to a protective component 207. The protective component 207 has a rectangular structure and is made of plastic. The top of the protective component 207 is embedded in the bottom of the side groove 101 and can move freely inside the side groove 101, thereby sealing the heat dissipation groove. There are two protective components 207, which are connected by two long rods. Each long rod has a long groove inside, and a guide plate 102 is slidably inserted inside each long groove. Each protective component 207 has a groove on its inner side, and a movable rod 205 is inserted inside the groove so that the movable rod 205 can be guided to move. Each groove has an inner groove 208 inside, which has an inclined structure. A pull rod 206 is slidably inserted inside each inner groove 208, and the protective component 207 can be moved freely through the inner groove 208.

[0033] refer to Figure 7 and Figure 8The auxiliary head 301 has a rectangular structure and is used to assist in creating the T-shaped groove. Each auxiliary head 301 has a control groove 302 on both sides. The control groove 302 has an inclined structure and is used to guide the displacement of the control lever 306 inside it. The bottom of the base 3 has eight contact heads 305. The contact heads 305 have a rectangular structure and are made of rubber to prevent slipping on the ground and fix the main body 1 firmly so that it will not shift after a collision. A control lever 306 with a U-shaped structure is inserted into every two control grooves 302. The control lever 306 is inserted into the sliding groove, which allows for convenient control of the pressure block 3. 03. Guided movement: The two ends of the control lever 306 are cylindrical structures; each control lever 306 has a transmission block 307 on its inner side. The transmission block 307 has a rectangular structure. Each transmission block 307 has a transmission groove at its top. A connecting block 204 is inserted into the inside of each transmission groove for transmission connection. Each transmission block 307 has a slide rod 308 on its side. The bottom of the slide rod 308 has a rectangular structure, and the top of the slide rod 308 has a T-shaped shaft structure. A spring is fitted on the outside of each slide rod 308, which can easily push the rectangular plate up so that the force rod 202 can be embedded and fixed above the front end of the drive groove 201. The slide rod 308 is inserted into the round hole of the rectangular plate.

[0034] The specific usage and function of this embodiment: In this invention, when this device needs to be used, it can first be manually pushed to move, allowing the device to rotate and move via pulleys, so that the main body 1 can be moved to the display position. Then, the control lever is pressed down, causing the force rod 202 to be guided and moved inside the drive groove 201, and then moved to the rear end of the drive groove 201. At the same time, the control lever 306 is moved together, allowing the control lever 306 to move inside the control groove 302. Since the control groove 302 is an inclined structure, the pressure block 303 and the moving head 304 are controlled to rise, causing the bottom part 3 to move downward, so that the contact head 305 can... The anti-slip contact with the ground enhances the stability of the main body 1, preventing displacement after a collision. When the force-bearing rod 202 moves, it simultaneously moves the transmission plate 203 and the moving rod 205, allowing the pull rod 206 to move within the inner groove 208. Because the inner groove 208 is inclined, the protective component 207 can be controlled to move downwards, allowing it to detach from the side groove 101 and exposing the heat dissipation slots for better heat dissipation from the main body 1. Then, the main body 1 is powered on, enabling holographic projection. When viewing the projection, the control plate 107 can be moved by pulling the round rod. The control panel 107 can be detached from the top of the main body 1, allowing the movable component 104 and auxiliary component 105 to be released from their fixed positions. This allows the movable component 104 and auxiliary component 105 to move downwards, positioning them on either side or at the front of the main body 1 to block light. Viewers then watch the film through the front of the auxiliary component 105, enhancing the immersive viewing experience. When the main body 1 is not in use or is stored, the control lever can be pulled, causing the force-bearing lever 202 to move within the drive groove 201. Simultaneously, this moves the control lever 306 within the control groove 302. Once at the frontmost position, the spring pushes the rectangular plate and connecting block 204 upwards. The force-bearing rod 202 can be embedded into the front end of the drive groove 201 and fixedly limited. When the control rod 306 moves inside the control groove 302, it can simultaneously move inside the sliding groove, thereby driving the pressure block 303 and the moving head 304 to move downward, so that the pulley can contact the ground. When the force-bearing rod 202 moves, it will drive the transmission plate 203 and the moving rod 205 to move together, so that the pull rod 206 can move in the opposite direction, so that the protective part 207 can rise and be placed inside the side groove 101, thereby sealing the heat dissipation groove. This prevents dust from entering the interior of the main body 1 through the heat dissipation groove when the device is stored or not in use, and then pushes the main body 1 to move.

Claims

1. A holographic immersive device, characterized in that, include: Main body (1); The main body (1) is the body of a holographic immersive projector. The top of the main body (1) is provided with 3D holographic projection glass. Two top pieces (103) are installed on both sides of the top of the main body (1). The top pieces (103) are slidably mounted with moving pieces (104). The inner side of the moving pieces (104) is provided with flocked black cloth. There are two moving pieces (104) in total. The inner side of each moving piece (104) is provided with two T-shaped heads. The front end of the two moving pieces (104) is provided with an auxiliary piece (105). The auxiliary piece (105) is a trumpet-shaped structure. The inner side of the auxiliary piece (105) is provided with flocked black cloth. Support piece (2); The support piece (2) is a T-shaped structure. The support piece (2) is fixed to the bottom of the main body (1). The inside of the support piece (2) is provided with a drive groove (201). The drive groove (201) is an L-shaped structure. The side of (201) is inclined. A U-shaped plate is provided on each side of the support (2). A moving rod (205) is slidably fitted on the outside of each U-shaped plate. A pull rod (206) is provided on the outside of the top of each moving rod (205). The pull rod (206) is cylindrical. The bottom part (3) is rectangular. The bottom part (3) is fixed to the bottom of the support (2). The top of the bottom part (3) is provided with four auxiliary heads (301). The auxiliary heads (301) and the bottom part (3) are provided with T-shaped grooves. A pressure block (303) and a moving head (304) are inserted into the inside of each T-shaped groove. The pressure block (303) is fixed to the top of the moving head (304). A sliding groove is provided inside the pressure block (303). A rotatable pulley is installed at the bottom of each moving head (304).

2. The holographic immersive device as described in claim 1, characterized in that: The main body (1) has a side groove (101) on each side, and each side groove (101) has a heat dissipation groove evenly arranged inside. The main body (1) has a guide plate (102) at the bottom middle position at both ends of the front and rear ends, and the guide plate (102) has a T-shaped plate structure.

3. The holographic immersive device as described in claim 1, characterized in that: The top piece (103) has an inverted U-shaped structure and is made of metal. A T-shaped head is inserted inside each top piece (103). A square plate is provided on the outer side of the rear end of each moving piece (104). A round hole is provided inside each square plate. A sliding groove (106) is provided at the bottom of the rear end of each moving piece (104). The sliding groove (106) has a rectangular structure and there are two sliding grooves (106).

4. The holographic immersive device as described in claim 3, characterized in that: A control plate (107) is slidably inserted into the two grooves (106). The control plate (107) has a rectangular structure. Each control plate (107) has a round hole at both ends. A guide rod (108) is provided on each side of the top of the control plate (107). The rear of the guide rod (108) has a rectangular structure, and the front end of the guide rod (108) has a T-shaped shaft structure. A spring is fitted on the outside of each guide rod (108). The guide rod (108) is inserted into the round hole of the square plate.

5. The holographic immersive device as described in claim 1, characterized in that: A force-bearing rod (202) is inserted inside the drive groove (201). The force-bearing rod (202) is a cylindrical structure. A transmission plate (203) is provided at each end of the force-bearing rod (202). The transmission plate (203) is a T-shaped structure. There are two transmission plates (203). A control rod is provided at the front end of the two transmission plates (203).

6. The holographic immersive device as described in claim 5, characterized in that: Each of the transmission plates (203) has a connecting block (204) at its bottom. The connecting block (204) has a U-shaped structure. Each connecting block (204) has a rectangular plate on its side. Each rectangular plate has a round hole inside. Each moving rod (205) has a pushing groove at its bottom. The top of the connecting block (204) is inserted into the pushing groove. The moving rod (205) has a Z-shaped structure.

7. The holographic immersive device as described in claim 2, characterized in that: Each of the movable rods (205) has a protective member (207) slidably connected to its top end. The protective member (207) is rectangular in shape and made of plastic. The top end of the protective member (207) is embedded in the bottom end of the side groove (101). There are two protective members (207) in total. The two protective members (207) are connected by two long rods. Each long rod has a long groove inside. A guide plate (102) is slidably inserted into the inside of each long groove. Each protective member (207) has a groove on its inner side. A movable rod (205) is inserted into the inside of the groove. Each groove has an inner groove (208) inside. The inner groove (208) is inclined. A pull rod (206) is slidably inserted into the inside of each inner groove (208).

8. The holographic immersive device as described in claim 5, characterized in that: The auxiliary head (301) has a rectangular structure, and each auxiliary head (301) has a control groove (302) on both sides. The control groove (302) has an inclined structure.

9. A holographic immersive device as described in claim 8, characterized in that: The bottom of the base (3) is provided with eight contact heads (305). The contact heads (305) are rectangular in structure and made of rubber. A control lever (306) is inserted into the interior of every two control slots (302). The control lever (306) is U-shaped and is inserted into the interior of the sliding slot. Both ends of the control lever (306) are cylindrical.

10. A holographic immersive device as described in claim 9, characterized in that: Each control lever (306) has a transmission block (307) on its inner side. The transmission block (307) has a rectangular structure. Each transmission block (307) has a transmission groove at its top. A connecting block (204) is inserted into the inside of each transmission groove. Each transmission block (307) has a slide rod (308) on its side. The bottom of the slide rod (308) has a rectangular structure. The top of the slide rod (308) has a T-shaped shaft structure. A spring is fitted on the outside of each slide rod (308). The slide rod (308) is inserted into the round hole of the rectangular plate.