A lung function exercise monitoring device

Abstract

This invention discloses a lung function training monitoring device, relating to the field of medical device technology. It includes an abdominal binder, which consists of an elastic band and two straps. The elastic band is fixedly connected between the two straps, and the ends of the two straps are secured with Velcro. A pressure monitoring mechanism is mounted on the elastic band, and a positioning mechanism is mounted on the rear side of the abdominal binder to fix the position of the two straps. By binding an abdominal binder around the patient's abdomen and waist to facilitate the installation of the pressure monitoring mechanism, the pressure sensor in the pressure monitoring mechanism can detect changes in pressure in real time when the patient performs abdominal breathing, causing the abdomen to expand. The pressure is monitored until a set threshold is reached, indicating that the patient's abdomen has expanded sufficiently (standard abdominal breathing). This ensures that patients can perform effective lung function training even without guidance.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a lung function exercise monitoring device. Background Technology

[0002] Lung function training is a health approach that enhances lung capacity and optimizes breathing patterns through specific breathing exercises and physical activities. It aims to significantly improve lung capacity, help clear respiratory secretions, and reduce the risk of respiratory infections. Abdominal breathing is one such exercise, and it is the most basic breathing method. It forms the foundation for learning other breathing techniques and is accomplished by increasing the movement of the diaphragm and reducing chest cavity movement. Abdominal breathing involves the diaphragm moving up and down. Because the diaphragm descends during inhalation, pushing organs downwards, the abdomen expands rather than the chest. Therefore, during exhalation, the diaphragm rises higher than usual, allowing for deeper breathing and expelling more carbon dioxide that tends to stagnate at the bottom of the lungs.

[0003] Abdominal breathing mainly involves the expansion of the abdomen. However, without professional guidance, patients often find it difficult to ensure that their abdomen expands fully each time, leading to non-standard abdominal breathing and affecting the actual training effect on lung function. Therefore, in order to solve the above problems, this application proposes a lung function exercise monitoring device. Summary of the Invention

[0004] The present invention provides a lung function training monitoring device to solve the above-mentioned technical problems.

[0005] To solve the above-mentioned technical problems, the present invention provides a lung function training monitoring device, including an abdominal belt, which consists of an elastic band and two straps. The elastic band is fixedly connected between the two straps, and the ends of the two straps are fixed by Velcro. A pressure monitoring mechanism is fitted onto the elastic band, and the pressure monitoring mechanism is used to monitor abdominal breathing movements. A positioning mechanism is installed on the back of the abdominal binder to fix the position of the two straps.

[0006] Preferably, the pressure monitoring mechanism includes an arc-shaped sleeve plate, which is sleeved on the outer end of the elastic band. An arc-shaped pressure plate is provided on the inner side of the arc-shaped sleeve plate, and an insert is fixedly connected to the outer side of the arc-shaped pressure plate. A groove is opened on the inner side of the arc-shaped sleeve plate, and the insert is located on the inner side of the arc-shaped sleeve plate and extends into the groove. A pressure sensor is fixedly connected to the inner wall of the groove, and the pressure sensor is directly opposite the center of the front side of the insert.

[0007] Preferably, a controller is fixedly connected to the outer side of the arc-shaped sleeve, and the controller is electrically connected to the pressure sensor.

[0008] Preferably, the positioning mechanism includes a housing located behind the abdominal belt, a top back assembly located at the front of the housing, the top back assembly passing through the housing and extending to the rear of the housing, connecting assemblies passing through both sides of the housing, multiple positioning sleeves fixedly connected to the outer side of the strap, the connecting assemblies being inserted into the positioning sleeves, and an adjustment assembly installed inside the housing, the two connecting assemblies being driven to move by the adjustment assembly.

[0009] Preferably, a sleeve is fixedly connected to the center of the inner shell, the top back assembly passes through the sleeve, and limit openings are provided on both sides of the outer shell, with the connecting assembly passing through the limit openings.

[0010] Preferably, the top and back assembly includes a rigid plate located in front of the outer shell. An anti-slip pad is fixedly connected to the front side of the rigid plate, and a threaded rod is movably connected to the center of the rear side of the rigid plate via a bearing. The threaded rod passes through a sleeve and is threadedly connected to the sleeve. A first rotating wheel is fixedly connected to the end of the threaded rod.

[0011] Preferably, the connecting assembly includes a connecting plate located inside the housing and extending to the outside of the housing, and the connecting plate passes through the limiting opening. Two vertically distributed connecting arms are fixedly connected to the rear side of the end of the connecting plate away from the housing. A positioning head is fixedly connected to the inner side of the end of each connecting arm, and the positioning head is located inside an adjacent positioning sleeve.

[0012] Preferably, two vertically distributed racks are fixedly connected to the rear side of the connecting plate, and a notch is provided at the end of the connecting plate away from the connecting arm, the notch being located between the two racks.

[0013] Preferably, the adjusting assembly includes a second transmission rod, which is movably connected to the top of the inner shell via a bearing seat. The second transmission rod is located inside the shell and extends to both sides of the shell. A second rotating wheel is fixedly connected to one end of the second transmission rod, which is located on one side of the shell. Two left-right distributed first transmission rods are movably connected to the rear side of the inner shell via a bearing seat. The first transmission rods are located below the second transmission rods. Two vertically distributed first gears are fixedly connected to the outer ends of the first transmission rods. The first gears mesh with a rack. Bevel gears are fixedly connected to the top of the first transmission rod and the outer ends of the second transmission rod, and adjacent bevel gears mesh with each other.

[0014] Preferably, a locking assembly is installed on the top of the other side of the outer casing. The locking assembly includes a T-shaped fixing block, which is fixedly connected to the top of the other side of the outer casing. A U-shaped movable block is sleeved on the T-shaped fixing block. A second gear is engaged with the bottom of the U-shaped movable block. The second gear is fixedly connected to the other end of the second transmission rod. A tension spring is fixedly connected between the top of the T-shaped fixing block and the inner top of the U-shaped movable block.

[0015] Compared with related technologies, the lung function training monitoring device provided by the present invention has the following beneficial effects: 1. By attaching an abdominal binder to the patient's abdomen and waist, a pressure monitoring device can be installed. When the patient performs abdominal breathing and the abdomen expands, the pressure sensor in the pressure monitoring device can detect the change in pressure value in real time. When the pressure value reaches the set threshold, it means that the patient's abdomen has expanded to the required extent, which is the standard abdominal breathing method. This can ensure that the patient can perform effective lung function training even without guidance.

[0016] 2. By installing a positioning mechanism at the back of the abdominal binder, the two straps of the abdominal binder are clamped and fixed on the patient's side. At the same time, the top back assembly is placed against the patient's back. At this time, the positioning mechanism is connected to the abdominal binder at three points and located on the patient's back. This ensures that when the patient's abdomen expands, only the elastic band part can expand, while the straps tied around the waist will not shift or tighten. This avoids affecting the pressure monitoring effect of the pressure monitoring device due to the displacement of the abdominal binder itself, thereby improving the accuracy of the pressure monitoring device in detecting the standard degree of abdominal expansion during the patient's abdominal breathing. It is very convenient to use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention from a first-view perspective; Figure 2 This is a schematic diagram of the overall structure of the present invention from a second perspective; Figure 3 This is a schematic diagram of the abdominal band structure of the present invention; Figure 4 This is an exploded view of the pressure monitoring mechanism of the present invention; Figure 5 This is a schematic diagram of the arc-shaped sleeve structure of the present invention; Figure 6 This is a schematic diagram of the positioning mechanism structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of section A in the middle; Figure 8 This is a partial cross-sectional view of the positioning mechanism of the present invention; Figure 9This is a schematic diagram of the top-back assembly structure of the present invention; Figure 10 This is an exploded view of the locking component of the present invention.

[0018] The diagram is labeled as follows: 1. Abdominal band; 11. Elastic band; 12. Strap; 2. Pressure monitoring mechanism; 21. Arc-shaped sleeve; 22. Arc-shaped pressure plate; 23. Insert; 24. Groove; 25. Pressure sensor; 26. Controller; 3. Positioning mechanism; 31. Housing; 311. Limiting opening; 312. Sleeve; 32. Top and back assembly; 321. Rigid plate; 322. Anti-slip pad; 323. Threaded rod; 324. First rotating wheel; 33. Connecting components, 331, connecting plate, 332, connecting arm, 333, positioning head, 334, rack, 335, notch, 34, positioning sleeve, 35, adjusting components, 351, first transmission rod, 352, first gear, 353, second transmission rod, 354, bevel gear, 355, second rotating wheel, 36, locking components, 361, second gear, 362, U-shaped movable block, 363, T-shaped fixed block, 364, tension spring. Detailed Implementation

[0019] Please see Figure 1-10 The technical solution provided by the present invention specifically includes the following embodiments:

[0020] A lung function training monitoring device includes an abdominal belt 1, which is composed of an elastic band 11 and two straps 12. The elastic band 11 is fixedly connected between the two straps 12, and the ends of the two straps 12 are fixed by Velcro.

[0021] A pressure monitoring mechanism 2 is fitted onto the elastic band 11, and the pressure monitoring mechanism 2 is used to monitor whether the abdominal breathing action is in place.

[0022] A positioning mechanism 3 is installed on the rear side of the abdominal binder 1, which is used to fix the position of the two straps 12.

[0023] The pressure monitoring mechanism 2 includes an arc-shaped sleeve 21, which is fitted onto the outer end of the elastic band 11. An arc-shaped pressure plate 22 is provided on the inner side of the arc-shaped sleeve 21. An insert 23 is fixedly connected to the outer side of the arc-shaped pressure plate 22. A groove 24 is opened on the inner side of the arc-shaped sleeve 21. The insert 23 is located on the inner side of the arc-shaped sleeve 21 and extends into the groove 24. A pressure sensor 25 is fixedly connected to the inner wall of the groove 24. The pressure sensor 25 is directly opposite the center of the front side of the insert 23. When the patient's abdomen expands, the elastic band 11 can stretch and lengthen, and its elasticity will also increase. During this period, the pressure sensor 25 located between the arc-shaped sleeve 21 and the arc-shaped pressure plate 22 will be squeezed, and the pressure value can be used to determine whether the patient's abdominal breathing is standard.

[0024] A controller 26 is fixedly connected to the outside of the arc-shaped sleeve 21. The controller 26 is electrically connected to the pressure sensor 25. After the device is worn, a professional guides the patient to perform abdominal breathing. When the patient's abdomen expands to the standard degree, the controller 26 records the pressure value of the pressure sensor 25 at this time. When the patient's abdomen contracts to the standard degree, the controller 26 records the pressure value of the pressure sensor 25 at this time. Then, the patient can perform voluntary abdominal breathing training.

[0025] The controller 26 has a built-in control chip and a battery, which are standard controller structures. The front of the controller 26 is also equipped with a touch screen and a player. The touch screen can be used to input commands to record pressure values ​​and training plans. When the patient's abdomen expands and contracts during abdominal breathing, the player will beep once the pressure value detected by the pressure sensor 25 reaches the recorded value to indicate that the target has been reached. This ensures that the patient can perform effective lung function training even without guidance.

[0026] The positioning mechanism 3 includes a housing 31 located behind the abdominal binder 1. A top-back assembly 32 is provided in front of the housing 31, and the top-back assembly 32 passes through the housing 31 and extends to the rear of the housing 31. Connecting assemblies 33 are connected through both sides of the housing 31. Multiple positioning sleeves 34 are fixedly connected to the outside of the strap 12. The connecting assemblies 33 are inserted into the positioning sleeves 34. An adjustment assembly 35 is installed inside the housing 31. The two connecting assemblies 33 are driven to move by the adjustment assembly 35. There are multiple positioning sleeves 34 on the outside of the strap 12, so that when patients of different body types use the abdominal binder 1, it can be ensured that there are corresponding positioning sleeves 34 on the front and sides of the patient to connect with the connecting assemblies 33.

[0027] A sleeve 312 is fixedly connected to the center of the outer shell 31. The top and back assembly 32 passes through the sleeve 312. Limiting openings 311 are opened on both sides of the outer shell 31. The connecting assembly 33 passes through the limiting openings 311. The top and back assembly 32 is connected to the outer shell 31 through the sleeve 312. The limiting openings 311 are mainly for the connecting plate 331 and the rack 334 in the connecting assembly 33 to pass through, so as to avoid interference between the connecting assembly 33 and the outer shell 31.

[0028] The top-back assembly 32 includes a rigid plate 321 located in front of the outer shell 31. An anti-slip pad 322 is fixedly connected to the front side of the rigid plate 321. A threaded rod 323 is movably connected to the center of the rear side of the rigid plate 321 via a bearing. The threaded rod 323 passes through the sleeve 312 and is threadedly connected to the sleeve 312. A first rotating wheel 324 is fixedly connected to the end of the threaded rod 323. When the two straps 12 are overlapped and pasted on the patient's lower back, the threaded rod 323 is rotated by the first rotating wheel 324 to push the rigid plate 321 closer to the patient's lower back until the anti-slip pad 322 is attached to the abdominal belt 1 on the patient's lower back. At this time, the top-back assembly 32 not only forms a three-point positioning of the abdominal belt 1 with the connecting assembly 33, but also further strengthens the stability of the abdominal belt 1 when it is pasted and bound. At the same time, it also makes the entire positioning mechanism 3 more stably installed on the abdominal belt 1 on the patient's back.

[0029] The connecting assembly 33 includes a connecting plate 331, which is located inside the outer shell 31 and extends to the outside of the outer shell 31. The connecting plate 331 passes through a limiting opening 311. Two vertically distributed connecting arms 332 are fixedly connected to the rear side of the end of the connecting plate 331 away from the outer shell 31. A positioning head 333 is fixedly connected to the inner side of the end of each connecting arm 332. The positioning head 333 is located inside an adjacent positioning sleeve 34. Two vertically distributed racks 334 are fixedly connected to the rear side of the connecting plate 331. A notch 335 is provided at the end of the connecting plate 331 away from the connecting arms 332. The notch 335 is located between the two racks 334. In addition to adapting to the shape of the connecting plate 331 so that it can slide stably left and right, 11 also has a reserved opening for the rack 334 to pass through, so there will be no interference problem. The notch 335 can prevent interference with the sleeve 312 when the two connecting plates 331 are too close. The two connecting arms 332 have a certain elastic deformation capability, so when the positioning head 333 is inserted into or pulled out of the positioning sleeve 34, only the connecting plate 332 needs to be slightly bent. When the positioning head 333 is inserted into the positioning sleeve 34, the positioning sleeve 34 located on the side of the patient should be selected. In this way, after the connecting component 33 is connected to the abdominal belt 1 through the positioning sleeve 34, the two straps 12 can be clamped inward and tied to the patient's waist for fixation.

[0030] The adjusting assembly 35 includes a second transmission rod 353, which is movably connected to the top of the inner part of the housing 31 via a bearing seat. The second transmission rod 353 is located inside the housing 31 and extends to both sides of the housing 31. A second rotating wheel 355 is fixedly connected to one end of the second transmission rod 353, and the second rotating wheel 355 is located on one side of the housing 31. Two first transmission rods 351, distributed left and right, are movably connected to the rear side of the inner part of the housing 31 via a bearing seat. The first transmission rods 351 are located below the second transmission rods 353, and their outer ends are fixedly connected to... There are two first gears 352 distributed vertically. The first gears 352 mesh with the rack 334. The top end of the first transmission rod 351 and the outer end of the second transmission rod 353 are both fixedly connected to bevel gears 354. The two adjacent bevel gears 354 mesh with each other. The first gears 352 can be driven to rotate by the transmission of the second rotating wheel 355, the second transmission rod 353, the bevel gears 354 and the first transmission rod 351. Then, the second gears 352 are driven by the meshing of the rack 334. Thus, the two connecting components can be driven to move closer or further apart by the adjusting component 35.

[0031] A locking assembly 36 is installed on the top of the other side of the outer casing 31. The locking assembly 36 includes a T-shaped fixing block 363, which is fixedly connected to the top of the other side of the outer casing 31. A U-shaped movable block 362 is fitted on the T-shaped fixing block 363. A second gear 361 is engaged with the bottom of the U-shaped movable block 362. The second gear 361 is fixedly connected to the other end of the second transmission rod 353. A tension spring 364 is fixedly connected between the top of the T-shaped fixing block 363 and the top of the U-shaped movable block 362. The bottom of the U-shaped movable block 362 has a tooth groove that matches the teeth of the second gear 361. Therefore, when the U-shaped movable block 362 is pulled by the tension spring 364, it will jam the second gear 361 downwards, thereby preventing the second transmission rod 353 from rotating. At this time, the entire adjustment assembly 35 is locked and cannot be adjusted.

[0032] After the abdominal binder 1 is tied to the patient's abdomen, if the binding force is too strong, the expansion of the abdomen during abdominal breathing will be subject to greater resistance, which will affect the effect of abdominal breathing. If the binding force is too weak, when the patient's abdomen expands, in addition to the elastic band 11 being elastically stretched, the binding band 12 will also be stretched further against the patient's back because it is relatively loose at this time. At this time, the amount of movement of the binding band 12 will affect the accuracy of the pressure monitoring device 2 and the elastic band 11 in monitoring the standard of abdominal breathing.

[0033] By installing a positioning mechanism connected to the straps 12 in the abdominal binder 1 on the patient's back, the top back component 32 holds the overlapping and pasted area of ​​the two straps 12 on the patient's back, and the two connecting components 33 quickly connect to the straps 12 through the positioning sleeves 34 on the outside of the straps 12. At this time, the entire positioning mechanism 3 limits the abdominal binder 1 in a three-point manner, so that even if the binding force is too small, the straps 12 will not move due to the expansion of the patient's abdomen, which would affect the accuracy of the pressure monitoring mechanism 2.

[0034] Working principle:

[0035] When using it, the abdominal binder 1 is tied to the patient's abdomen with appropriate tightness, the pressure monitoring mechanism 2 is placed in front of the abdomen, and then the positioning mechanism 3 is installed on the back of the abdominal binder 1.

[0036] When installing the positioning mechanism 3, the positions of the two connecting components 33 are initially adjusted using the adjusting component 35. Then, the two positioning heads 333 in the connecting components 33 are inserted vertically into the positioning sleeve 34 on the side of the abdominal binder 1, located directly to the patient's side. Subsequently, the positions of the two connecting components 33 are adjusted again using the adjusting component 35 so that the connecting components 33 can clamp the two straps 12 in the abdominal binder 1 tightly against the patient's side. While adjusting the position of the connecting components 33 using the adjusting component 35, the second transmission rod 353 is driven to rotate via the second rotating wheel 355, and then the two first transmission rods 351 are driven to rotate via the meshing transmission of the bevel gear 354. The connecting plate 331 is then moved by the meshing transmission of the first gear 352 and the rack 334, thereby adjusting the position of the entire connecting assembly 33. Before operating the adjusting assembly 35, the restriction provided by the locking assembly 36 needs to be released. Simply pinch the U-shaped movable block 362 and lift it up so that it does not mesh with the second gear 361. After the position of the connecting assembly 33 is adjusted, simply release the U-shaped movable block 362. At this time, the elastic force of the tension spring 364 will pull the U-shaped movable block 362 down so that it meshes with the second gear 361, thereby preventing the second transmission rod 353 from rotating, that is, the adjusting assembly 35 can no longer be operated.

[0037] Finally, the first rotating wheel 324 rotates the threaded rod 323 to drive the rigid plate 321 to move closer to the patient's back until the anti-slip soft pad 322 is pressed against the patient's back. At this time, when the patient is doing abdominal breathing, when the abdomen bulges, only the elastic band 11 can be stretched and generate elastic force as the pressure monitoring mechanism 2 is pushed up by the abdomen. The strap 12 will not move due to the positioning mechanism 3. Its position and force on the patient's abdomen and back will not change. Therefore, when the abdomen bulges due to abdominal breathing, the pressure sensor 25 in the pressure monitoring mechanism 2 can detect the pressure value and reflect whether the patient's abdomen bulges properly.

Claims

1. A lung function training monitoring device, comprising an abdominal binder (1), characterized in that: The abdominal binder (1) consists of an elastic band (11) and two straps (12). The elastic band (11) is fixedly connected between the two straps (12), and the ends of the two straps (12) are fixed by Velcro. A pressure monitoring mechanism (2) is fitted onto the elastic band (11), and the pressure monitoring mechanism (2) is used to monitor abdominal breathing movements. The abdominal binder (1) is fitted with a positioning mechanism (3) on the back side, which is used to fix the positions of the two straps (12).

2. The lung function training monitoring device according to claim 1, characterized in that, The pressure monitoring mechanism (2) includes an arc-shaped sleeve (21), which is sleeved on the outer end of the elastic band (11). An arc-shaped pressure plate (22) is provided on the inner side of the arc-shaped sleeve (21). An insert (23) is fixedly connected to the outer side of the arc-shaped pressure plate (22). A groove (24) is opened on the inner side of the arc-shaped sleeve (21). The insert (23) is located on the inner side of the arc-shaped sleeve (21) and extends into the groove (24). A pressure sensor (25) is fixedly connected to the inner wall of the groove (24). The pressure sensor (25) is directly opposite the center of the front side of the insert (23).

3. The lung function training monitoring device according to claim 2, characterized in that, A controller (26) is fixedly connected to the outside of the arc-shaped sleeve (21), and the controller (26) is electrically connected to the pressure sensor (25).

4. The lung function training monitoring device according to claim 1, characterized in that, The positioning mechanism (3) includes a housing (31) located behind the abdominal belt (1). A top back assembly (32) is provided in front of the housing (31), and the top back assembly (32) penetrates the housing (31) and extends to the rear of the housing (31). Connecting components (33) are connected through both sides of the housing (31). Multiple positioning sleeves (34) are fixedly connected to the outside of the strap (12). The connecting components (33) are plugged into the positioning sleeves (34). An adjustment component (35) is installed inside the housing (31). The two connecting components (33) are driven to move by the adjustment component (35).

5. A lung function training monitoring device according to claim 4, characterized in that, A sleeve (312) is fixedly connected to the center of the outer shell (31), and the top back assembly (32) penetrates the sleeve (312). Limit openings (311) are opened on both sides of the outer shell (31), and the connecting assembly (33) penetrates the limit openings (311).

6. The lung function training monitoring device according to claim 5, characterized in that, The top and back assembly (32) includes a rigid plate (321) located in front of the outer shell (31). An anti-slip pad (322) is fixedly connected to the front side of the rigid plate (321). A threaded rod (323) is movably connected to the center of the rear side of the rigid plate (321) via a bearing. The threaded rod (323) passes through the sleeve (312) and is threadedly connected to the sleeve (312). A first rotating wheel (324) is fixedly connected to the end of the threaded rod (323).

7. A lung function training monitoring device according to claim 4, characterized in that, The connecting assembly (33) includes a connecting plate (331), which is located inside the housing (31) and extends to the outside of the housing (31). The connecting plate (331) passes through the limiting opening (311). Two vertically distributed connecting arms (332) are fixedly connected to the rear side of the end of the connecting plate (331) away from the housing (31). A positioning head (333) is fixedly connected to the inner side of the end of the connecting arm (332). The positioning head (333) is located inside the adjacent positioning sleeve (34).

8. A lung function training monitoring device according to claim 7, characterized in that, The connecting plate (331) is fixedly connected to two vertically distributed racks (334) on its rear side. The connecting plate (331) has a notch (335) at one end away from the connecting arm (332), and the notch (335) is located between the two racks (334).

9. A lung function training monitoring device according to claim 8, characterized in that, The adjustment assembly (35) includes a second transmission rod (353), which is movably connected to the top of the inner shell (31) via a bearing seat. The second transmission rod (353) is located inside the shell (31) and extends to both sides of the shell (31). A second rotating wheel (355) is fixedly connected to one end of the second transmission rod (353). The second rotating wheel (355) is located on one side of the shell (31). Two left-right distributed first transmission rods (351) are movably connected to the rear side of the inner shell (31) via a bearing seat. The first transmission rods (351) are located below the second transmission rods (353). Two up-down distributed first gears (352) are fixedly connected to the outer end of the first transmission rods (351). The first gears (352) mesh with the rack (334). Bevel gears (354) are fixedly connected to the top of the first transmission rods (351) and the outer end of the second transmission rods (353). Two adjacent bevel gears (354) mesh with each other.

10. A lung function training monitoring device according to claim 9, characterized in that, A locking assembly (36) is installed on the top of the other side of the outer casing (31). The locking assembly (36) includes a T-shaped fixing block (363), which is fixedly connected to the top of the other side of the outer casing (31). A U-shaped movable block (362) is fitted on the T-shaped fixing block (363). A second gear (361) is engaged with the bottom of the U-shaped movable block (362). The second gear (361) is fixedly connected to the other end of the second transmission rod (353). A tension spring (364) is fixedly connected between the top of the T-shaped fixing block (363) and the top of the U-shaped movable block (362).

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