Blood pressure measuring device

Abstract

The utility model relates to the technical field of blood pressure measuring devices, and discloses a blood pressure measuring device. The toothed belt is arranged on the periphery of the variable-diameter ring in a sleeving mode, a first rack is arranged on the outer surface of the first end of the toothed belt, and a second rack is arranged on the inner surface of the second end of the toothed belt; the gear shaft is located between the first rack and the second rack and is in meshing transmission with the first rack and the second rack. A driving mechanism; the transmission case is in transmission connection with the gear shaft and the power output end of the driving mechanism; a self-locking mechanism is arranged in the transmission box; the air bag measuring assembly comprises an air bag, an inflator pump, a control valve and an air pressure sensor. The air bag is fixed to the inner side of the variable-diameter ring. The control valve and the inflator pump are communicated with the airbag; the air pressure sensor is used for detecting the air pressure of the airbag; the control module comprises a control panel and a display screen, and the display screen, the driving mechanism, the inflator pump, the control valve and the air pressure sensor are all in communication connection with the control panel. The blood pressure measuring device is short in measuring period.

Description

Technical Field

[0001] The utility model relates to the technical field of blood pressure measuring devices, in particular to a blood pressure measuring device. Background Art

[0002] Blood pressure is a major basic medical parameter of the human body. Daily blood pressure monitoring is an important way to monitor health status, especially for the elderly and those who need to monitor blood pressure data daily. Currently, non-invasive automatic blood pressure measurement devices that do not require professional intervention are becoming more and more popular.

[0003] Traditional electronic blood pressure monitors measure blood pressure by manually wrapping a cuff around the arm. Elderly people are slow in operation, and it is difficult to manually wrap and tie the arm with one hand. There are also problems such as different tightness and position of the binding, which can easily affect the accuracy of the measurement results.

[0004] Therefore, tunnel-type arm-band electronic blood pressure monitors are more popular among people. However, because the circumference of each person's arm is different, tunnel-type arm-band electronic blood pressure monitors usually use a double-airbag structure, using the outer airbag to inflate and pressurize to close to the arm circumference of the person being measured, and then use the inner airbag for measurement. However, this method takes a long time to inflate, resulting in a long measurement cycle. Utility Model Content

[0005] In view of this, the utility model provides a blood pressure measuring device to solve the problem that the traditional blood pressure meter has a long measuring cycle and low reliability of the measured data.

[0006] The utility model provides a blood pressure measuring device, comprising a housing assembly, a variable diameter ring, a toothed belt, a gear shaft, a driving mechanism, a transmission box, an airbag measuring assembly and a control module; the variable diameter ring is arranged inside the housing assembly; the toothed belt is cylindrical and sleeved on the outer circumference of the variable diameter ring, the outer surface of the first end of the toothed belt is provided with a first rack, and the inner surface of the second end of the toothed belt is provided with a second rack; the gear shaft is rotatably connected in the housing assembly, located between the first rack and the second rack, and meshed with the first rack and the second rack for transmission; the driving mechanism; the transmission The gear box transmission connects the gear shaft and the power output end of the driving mechanism; a self-locking mechanism is provided in the transmission box; the airbag measurement assembly includes an airbag, an air pump, a control valve and an air pressure sensor, the airbag is fixed on the inner side of the variable diameter ring and is located between the first rack and the second rack; the control valve and the air pump are both connected to the airbag, and the air pressure sensor is used to detect the air pressure of the airbag; the control module includes a control panel and a display screen, the display screen, the driving mechanism, the air pump, the control valve and the air pressure sensor are all communicatively connected to the control panel.

[0007] Beneficial effects: the drive mechanism drives the transmission box and then drives the gear shaft to rotate, the teeth on the gear shaft are respectively meshed with the first rack and the second rack of the toothed belt, driving the two ends of the toothed belt to contract synchronously, squeezing the variable diameter ring to quickly deform to fit the human arm circumference, and then measuring the blood pressure through the airbag measuring component. Since the two ends of the toothed belt contract synchronously, the diameter change time of the variable diameter ring is short, thereby shortening the measurement cycle of the blood pressure measuring device; and, since the two ends of the toothed belt contract synchronously, the accuracy of the position of the airbag is guaranteed, thereby ensuring the accuracy of the measurement; a self-locking mechanism is also provided in the transmission box, and the self-locking characteristics of the self-locking mechanism can also be used to achieve the purpose of stopping and locking.

[0008] In an optional embodiment, a first avoidance opening is provided on the second end of the toothed belt, the first avoidance opening extends along the circumferential direction of the variable diameter ring, and the second rack is provided on both sides of the first avoidance opening in the axial direction of the variable diameter ring; a first narrow strip is protruding from the first end of the toothed belt along the circumferential direction of the variable diameter ring, the first narrow strip corresponds to the position of the first avoidance opening, and is cross-passed through the first avoidance opening to the outside of the toothed belt, and the first rack is arranged on the first narrow strip.

[0009] Beneficial effect: The first avoidance opening and the first narrow strip are provided so that the first end of the toothed belt and the second end of the toothed belt can be cross-threaded, and the first end of the toothed belt can be passed through the first avoidance opening to the outside of the toothed belt, thereby preventing the first end of the toothed belt from rubbing against the inner ring of the toothed belt to generate resistance and noise. The first avoidance opening is provided with the second racks on both sides of the axial direction of the variable diameter ring, and the movement of the first narrow strip can be limited by the second racks on both sides, thereby preventing the first narrow strip from being dislocated and offset.

[0010] In an optional embodiment, the first narrow strip is located in the middle of the first narrow strip in the axial direction of the variable diameter ring; the first avoidance opening is located in the middle of the second end of the toothed belt in the axial direction of the variable diameter ring; the width of the first narrow strip in the axial direction of the variable diameter ring is smaller than the width of the first avoidance opening.

[0011] In an optional implementation, it also includes:

[0012] A first limiting shaft is rotatably connected in the housing assembly and is located between the variable diameter ring and the gear shaft, and the first end of the toothed belt is movably arranged between the first limiting shaft and the gear shaft;

[0013] The second limiting shaft is rotatably connected in the housing assembly and is spaced apart from the second limiting shaft. The gear shaft is located between the first limiting shaft and the second limiting shaft. The second end of the toothed belt is movably passed between the second limiting shaft and the gear shaft.

[0014] Beneficial effects: The setting of the first limiting shaft can limit the movement of the first end of the toothed belt and ensure that the first rack and the gear shaft always remain in a meshing state; the setting of the second limiting shaft can limit the movement of the second end of the toothed belt and ensure that the second rack and the gear shaft always remain in a meshing state.

[0015] In an optional implementation, the first limiting shaft, the gear shaft and the second limiting shaft are sequentially arranged along the radial direction of the variable diameter ring.

[0016] In an optional embodiment, it also includes a gear box shell, which is arranged inside the shell assembly; the first limit shaft and the second limit shaft are both detachably connected to the gear box shell; the gear box shell is provided with through holes at both ends of the axial direction of the variable diameter ring, and connecting shafts are protruding at both ends of the gear shaft, and the two connecting shafts are rotatably inserted into the two through holes, and one connecting shaft is connected to the transmission box.

[0017] In an optional embodiment, a second avoidance opening and a third avoidance opening are respectively provided on both sides of the gear box shell, and the second avoidance opening is arranged on a side close to the variable diameter ring in the radial direction of the variable diameter ring, and the width of the second avoidance opening in the axial direction of the variable diameter ring is smaller than the width of the third avoidance opening; the first narrow strip passes through the two second avoidance openings in sequence, and the second end of the toothed belt passes through the two third avoidance openings in sequence.

[0018] In an optional embodiment, a fourth avoidance opening is provided on the first end of the toothed belt, the fourth avoidance opening extends along the circumferential direction of the variable diameter ring, and the first rack is provided on both sides of the fourth avoidance opening in the axial direction of the variable diameter ring; a second narrow strip is protruding from the second end of the toothed belt along the circumferential direction of the variable diameter ring, the second narrow strip corresponds to the position of the fourth avoidance opening, and is cross-passed through the fourth avoidance opening to the outside of the toothed belt, and the second rack is arranged on the second narrow strip.

[0019] In an optional embodiment, it also includes a third limiting shaft, which is arranged at the intersection of the second narrow strip and the first end of the toothed belt, and is located on the side of the second narrow strip facing away from the second rack and the side of the first end of the toothed belt facing away from the first rack; the gear shaft is arranged at the intersection of the second narrow strip and the first end of the toothed belt, and is located on the side of the second narrow strip where the second rack is provided and the side of the first end of the toothed belt where the first rack is provided.

[0020] In an optional implementation, it also includes:

[0021] A first limiting structure, disposed on the inner wall of the housing assembly, for limiting the movement of the first narrow strip that crosses and penetrates the outside of the toothed belt;

[0022] The second limiting structure is arranged on the inner wall of the housing assembly and is used to limit the movement of the second end of the toothed belt after the crossing.

[0023] In an optional embodiment, the first limiting structure includes a first arc plate and a second arc plate, the first arc plate and the second arc plate are arranged opposite to each other and at intervals, and form an arc-shaped first limiting channel, and the first narrow strip that crosses and passes to the outside of the toothed belt is movably arranged in the first limiting channel.

[0024] In an optional embodiment, the second limiting structure includes a third arc plate and a fourth arc plate, and the third arc plate and the fourth arc plate are arranged opposite to each other and at intervals to form an arc-shaped second limiting channel, and the second end of the crossed toothed belt is movably arranged in the second limiting channel.

[0025] In an optional embodiment, the transmission box includes:

[0026] A worm gear fixedly connected to the power output end;

[0027] A turbine, meshing with the worm; the turbine and the worm form the self-locking mechanism;

[0028] A spur gear assembly is meshed with the turbine and is provided with a D-shaped output shaft, wherein the D-shaped output shaft is connected with the D-shaped hole at the end of the gear shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 An exploded view of a partial structure of a blood pressure measuring device according to an embodiment of the utility model from one viewing angle;

[0031] Figure 2 An exploded view of a partial structure of a blood pressure measuring device according to an embodiment of the utility model from another perspective;

[0032] Figure 3 A side view of a partial structure of a blood pressure measuring device according to an embodiment of the utility model;

[0033] Figure 4 A schematic diagram of a partial structure of a blood pressure measuring device according to an embodiment of the utility model;

[0034] Figure 5 A schematic diagram of a blood pressure measuring device according to an embodiment of the present utility model;

[0035] Figure 6 A cross-sectional view of a blood pressure measuring device according to an embodiment of the utility model from one viewing angle;

[0036] Figure 7 A cross-sectional view of a blood pressure measuring device according to an embodiment of the utility model from another perspective;

[0037] Figure 8 This is an exploded view of a blood pressure measuring device according to an embodiment of the utility model;

[0038] Fig. 9 A schematic diagram of a partial structure of another blood pressure measuring device according to an embodiment of the utility model;

[0039] Fig.10 It is a front view of a partial structure of another blood pressure measuring device according to an embodiment of the utility model;

[0040] Fig.11 for Fig.10 AA section view;

[0041] Fig.12 for Fig.11 A magnified schematic diagram of middle C;

[0042] Fig.13 for Fig.10 BB section view;

[0043] Fig.14 for Fig.13 A magnified schematic diagram of D in the middle;

[0044] Fig.15 A partial side view of another blood pressure measuring device according to an embodiment of the present utility model;

[0045] Fig.16 This is a connection diagram of a blood pressure measuring device according to an embodiment of the utility model;

[0046] Fig.17 A first schematic diagram of a transmission box of a blood pressure measuring device according to an embodiment of the present utility model;

[0047] Fig.18 A second schematic diagram of a transmission box of a blood pressure measuring device according to an embodiment of the present utility model;

[0048] Fig.19A third schematic diagram of a transmission box of a blood pressure measuring device according to an embodiment of the present utility model;

[0049] Fig. 20 This is a fourth schematic diagram of the transmission box of the blood pressure measuring device according to an embodiment of the present utility model.

[0050] Description of reference numerals:

[0051] 1. Shell assembly; 101. Front shell; 102. Rear shell; 2. Variable diameter ring; 3. Toothed belt; 31. First rack; 32. Second rack; 33. First avoidance; 34. Fourth avoidance; 4. Gear shaft; 41. D-type hole; 5. Driving mechanism; 6. Transmission box; 61. Worm; 62. Turbine; 63. Spur gear assembly; 64. D-type output shaft; 71. Airbag; 72. Air pump; 73. Control valve; 74. Air pressure sensor; 75. Air pipe; 81. Control board; 82. Display screen; 9. First limit axis; 10. Second limit axis; 11. Gear box shell; 12. Third limit axis; 13. First arc plate; 14. Second arc plate; 15. Third arc plate; 16. Fourth arc plate; 17. Battery. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0053] Combine the following Figures 1 to 20 , describing an embodiment of the utility model.

[0054] According to an embodiment of the utility model, a blood pressure measuring device is provided, comprising a housing assembly 1, a variable diameter ring 2, a toothed belt 3, a gear shaft 4, a driving mechanism 5, a transmission box 6, an airbag measuring assembly and a control module; the variable diameter ring 2 is arranged inside the housing assembly 1; the toothed belt 3 is cylindrical and sleeved on the outer periphery of the variable diameter ring 2, the outer surface of the first end of the toothed belt 3 is provided with a first rack 31, and the inner surface of the second end of the toothed belt 3 is provided with a second rack 32; the gear shaft 4 is rotatably connected in the housing assembly 1, is located between the first rack 31 and the second rack 32, and is meshed with the first rack 31 and the second rack 32 for transmission; the driving mechanism 5; the transmission box 6 is connected to the gear shaft 4 and the power output end of the driving mechanism 5; a self-locking mechanism is provided in the transmission box 6; the airbag measuring assembly includes an airbag 71, an air pump 72, a control valve 73 and an air pressure sensor 74, the airbag 71 is fixed on the inner side of the variable diameter ring 2 and is located between the first rack 31 and the second rack 32; the control valve 73 and the air pump 72 are both connected to the airbag 71, and the air pressure sensor 74 is used to detect the air pressure of the airbag 71; the control module includes a control board 81 and a display screen 82, and the display screen 82, the driving mechanism 5, the air pump 72, the control valve 73 and the air pressure sensor 74 are all connected to the control board 81 for communication.

[0055] The transmission box 6 is driven by the driving mechanism 5 to drive the gear shaft 4 to rotate. The teeth on the gear shaft 4 are meshed with the first rack 31 and the second rack 32 of the toothed belt 3, respectively, driving the two ends of the toothed belt 3 to shrink synchronously, squeezing the variable diameter ring 2 to deform rapidly to fit the human arm circumference, and then measuring the blood pressure through the airbag measurement assembly. Due to the synchronous shrinkage of the two ends of the toothed belt 3, the diameter change time of the variable diameter ring 2 is short, thereby shortening the measurement cycle of the blood pressure measurement device; and due to the synchronous shrinkage of the two ends of the toothed belt 3, the accuracy of the position of the airbag 71 is also guaranteed, thereby ensuring the accuracy of the measurement; the transmission box 6 is also provided with a self-locking mechanism, and the self-locking characteristics of the self-locking mechanism can also achieve the purpose of stopping and locking. After the measurement is completed, the control module can control the gear shaft 4 to rotate in the opposite direction through the driving mechanism 5 and the transmission box 6, so that the two ends of the toothed belt 3 are released synchronously, and the variable diameter ring 2 is reopened under the action of its own elastic force.

[0056] In some embodiments, the blood pressure measuring device is further provided with a stethoscope head. The synchronous contraction of the two ends of the toothed belt 3 helps the stethoscope head to land accurately, further improving the accuracy of blood pressure measurement.

[0057] In this embodiment, the rotation of a single gear shaft 4 drives the two ends of the toothed belt 3 to contract or release synchronously; in the related art, the meshing rotation of two gear shafts 4 drives the two ends of the toothed belt 3 to contract or release synchronously; compared with the two gear shafts 4 in the related art, the single gear shaft 4 of this embodiment is smaller in size and occupies less space in the housing assembly 1, which is conducive to designing a lighter and smaller portable blood pressure measurement device. Moreover, the transmission box 6 drives a single gear shaft 4, which can improve the output efficiency of the transmission box 6 compared with driving two gear shafts 4.

[0058] In a specific implementation, the communication connection includes a network connection through a wireless network or Bluetooth, and an electrical connection through a connecting line. The airbag 71 is connected to the air pump 72 through an air tube 75, and the air pump 72 and the control valve 73 can be electrically connected to the control board 81, and the display screen 82 can also be electrically connected to the control board 81. The control valve 73 can be a solenoid valve, and the drive mechanism 5 can be a motor. The blood pressure measuring device can also include a battery 17, and the battery 17 is electrically connected to the control board 81 and the display screen 82. In this embodiment, the blood pressure measuring device can also include a stethoscope head assembly, and the electronic stethoscope method is realized by the stethoscope head assembly, combined with the oscillometric method of the airbag measurement assembly, to achieve a more accurate result than the ordinary single method.

[0059] In one embodiment, Figures 1 to 8 As shown, a first avoidance opening 33 is provided on the second end of the toothed belt 3, and the first avoidance opening 33 extends along the circumferential direction of the variable diameter ring 2, and the first avoidance opening 33 is provided with a second rack 32 on both sides of the axial direction of the variable diameter ring 2; a first narrow strip is protruding from the first end of the toothed belt 3 along the circumferential direction of the variable diameter ring 2, and the first narrow strip corresponds to the position of the first avoidance opening 33, and is cross-pierced through the first avoidance opening 33 to the outside of the toothed belt 3, and the first rack 31 is arranged on the first narrow strip.

[0060] The first avoidance opening 33 and the first narrow strip are provided so that the first end of the toothed belt 3 and the second end of the toothed belt 3 can be cross-threaded, and the first end of the toothed belt 3 can be passed through the first avoidance opening 33 to the outside of the toothed belt 3, thereby preventing the first end of the toothed belt 3 from rubbing against the inner ring of the toothed belt 3 to generate resistance and noise. The first avoidance opening 33 is provided with second racks 32 on both sides of the axial direction of the variable diameter ring 2, and the movement of the first narrow strip can also be limited by the second racks 32 on both sides, thereby preventing the first narrow strip from being misplaced and offset.

[0061] In one embodiment, the first narrow strip is located in the middle position of the first narrow strip in the axial direction of the variable diameter ring 2; the first avoidance opening 33 is located in the middle position of the second end of the toothed belt 3 in the axial direction of the variable diameter ring 2; the width of the first narrow strip in the axial direction of the variable diameter ring 2 is smaller than the width of the first avoidance opening 33.

[0062] The first narrow strip and the first avoidance opening 33 are located in the middle position, which can make the force uniform and avoid displacement and dislocation during movement; the width of the first narrow strip is smaller than the width of the first avoidance opening 33, which can ensure the smooth movement of the first narrow strip at the first avoidance opening 33.

[0063] In one embodiment, it also includes a first limiting shaft and a second limiting shaft; the first limiting shaft is rotatably connected in the housing assembly 1 and is located between the variable diameter ring 2 and the gear shaft 4, and the first end of the toothed belt 3 is movably arranged between the first limiting shaft and the gear shaft 4; the second limiting shaft is rotatably connected in the housing assembly 1 and is spaced apart from the second limiting shaft, the gear shaft 4 is located between the first limiting shaft and the second limiting shaft, and the second end of the toothed belt 3 is movably arranged between the second limiting shaft and the gear shaft 4.

[0064] The setting of the first limiting shaft can limit the movement of the first end of the toothed belt 3 and ensure that the first rack 31 and the gear shaft 4 always remain in a meshing state; the setting of the second limiting shaft can limit the movement of the second end of the toothed belt 3 and ensure that the second rack 32 and the gear shaft 4 always remain in a meshing state.

[0065] In one embodiment, the first limiting shaft 9, the gear shaft 4 and the second limiting shaft 10 are sequentially arranged along the radial direction of the variable diameter ring 2. It can be ensured that the first limiting shaft 9 and the second limiting shaft 10 both have good limiting effects, and the first end of the toothed belt 3 and the second end of the toothed belt 3 will not be excessively bent, and the large movement resistance caused by excessive bending is also avoided.

[0066] In one embodiment, it also includes a gear box shell 11, which is arranged inside the shell assembly 1; the first limit shaft 9 and the second limit shaft 10 are both detachably connected to the gear box shell 11; the gear box shell 11 is provided with through holes at both ends of the axial direction of the variable diameter ring 2, and connecting shafts are protruding at both ends of the gear shaft 4, and the two connecting shafts are rotatably inserted into the two through holes, and one connecting shaft is connected to the transmission box 6.

[0067] The setting of the gear box shell 11 can not only rotatably fix the first limiting shaft 9, the second limiting shaft 10 and the gear shaft 4, but also simplify the housing assembly 1 and simplify the disassembly and installation of the first limiting shaft 9, the second limiting shaft 10 and the gear shaft 4.

[0068] In one embodiment, a second avoidance opening and a third avoidance opening are respectively provided on both sides of the gear box shell 11, and the second avoidance opening is arranged on a side close to the variable diameter ring 2 in the radial direction of the variable diameter ring 2, and the width of the second avoidance opening in the axial direction of the variable diameter ring 2 is smaller than the width of the third avoidance opening; the first narrow strip passes through the two second avoidance openings in sequence, and the second end of the toothed belt 3 passes through the two third avoidance openings in sequence.

[0069] The setting of the second avoidance opening can limit and guide the movement of the first narrow strip; the setting of the third avoidance opening can limit and guide the second end of the toothed belt 3.

[0070] In a specific embodiment, the two ends of the tooth box shell 11 in the axial direction of the variable diameter ring 2 are respectively abutted against the two ends of the housing assembly 1; the tooth box shell 11 is provided with a first shell body and a second shell body in the axial direction of the variable diameter ring 2, and the first shell body and the second shell body are symmetrically arranged and abutted against each other. The housing assembly 1 includes a cylindrical front shell 101 and a rear shell 102, and the rear shell 102 is detachably connected to one end of the front shell 101; the tooth box shell 11 is arranged at the lower part of the front shell 101, and the two ends are respectively abutted against the rear shell 102 and the front shell 101.

[0071] In one embodiment, Figures 9 to 15 As shown, a fourth avoidance opening 34 is provided on the first end of the toothed belt 3, and the fourth avoidance opening 34 extends along the circumferential direction of the variable diameter ring 2, and the fourth avoidance opening 34 is provided with a first rack 31 on both sides of the axial direction of the variable diameter ring 2; a second narrow strip is protruding from the second end of the toothed belt 3 along the circumferential direction of the variable diameter ring 2, and the second narrow strip corresponds to the position of the fourth avoidance opening 34, and is cross-pierced through the fourth avoidance opening 34 to the outside of the toothed belt 3, and the second rack 32 is arranged on the second narrow strip.

[0072] The fourth avoidance opening 34 and the second narrow strip are provided so that the first end of the toothed belt 3 and the second end of the toothed belt 3 can be cross-threaded, and the second end of the toothed belt 3 can be passed through the fourth avoidance opening 34 to the outside of the toothed belt 3, thereby preventing the second end of the toothed belt 3 from rubbing against the inner ring of the toothed belt 3 to generate resistance and noise. The fourth avoidance opening 34 is provided with first racks 31 on both sides of the axial direction of the variable diameter ring 2, and the movement of the second narrow strip can be limited by the first racks 31 on both sides, thereby preventing the second narrow strip from being misplaced and offset.

[0073] In one embodiment, a third limiting shaft 12 is further included, which is arranged at the intersection of the second narrow strip and the first end of the toothed belt 3, and is located on the side of the second narrow strip facing away from the second rack 32 and on the side of the first end of the toothed belt 3 facing away from the first rack 31; the gear shaft 4 is arranged at the intersection of the second narrow strip and the first end of the toothed belt 3, and is located on the side of the second narrow strip where the second rack 32 is provided and on the side of the first end of the toothed belt 3 where the first rack 31 is provided.

[0074] A third limiting shaft 12 is provided to limit the second narrow strip and the first end of the toothed belt 3 at the same time, ensuring that the first rack 31 and the second rack 32 can always mesh with the gear shaft 4 during the movement of the second narrow strip and the first end of the toothed belt 3.

[0075] In one embodiment, it also includes a first limiting structure and a second limiting structure; the first limiting structure is arranged on the inner wall of the shell assembly 1, and is used to limit the movement of the first narrow strip that crosses and passes through the outside of the toothed belt 3; the second limiting structure is arranged on the inner wall of the shell assembly 1, and is used to limit the movement of the second end of the toothed belt 3 after crossing.

[0076] In one embodiment, the first limiting structure includes a first arc plate 13 and a second arc plate 14, which are arranged opposite to each other and spaced apart to form an arc-shaped first limiting channel, and the first narrow strip that crosses and penetrates the outside of the toothed belt 3 is movably arranged in the first limiting channel. The first arc plate 13 and the second arc plate 14 limit and guide the first narrow strip on both sides of the first narrow strip.

[0077] In one embodiment, the second limiting structure includes a third arc plate 15 and a fourth arc plate 16, which are arranged opposite to each other and spaced apart to form an arc-shaped second limiting channel, and the second end of the crossed toothed belt 3 is movably arranged in the second limiting channel. The third arc plate 15 and the fourth arc plate 16 limit and guide the second end of the toothed belt 3 on both sides of the second end of the toothed belt 3.

[0078] Specifically, the housing assembly 1 includes a cylindrical front shell 101 and a rear shell 102, the rear shell 102 is connected to one end of the front shell 101, and the other end of the front shell 101 and the rear shell 102 are provided with a first limiting structure and a second limiting structure, the first limiting structure on the front shell 101 corresponds to the position of the first limiting structure on the rear shell 102, and the second limiting structure on the front shell 101 corresponds to the position of the second limiting structure on the rear shell 102. Further, at the channel entrance of the first limiting channel, the distance between the first arc plate 13 and the second arc plate 14 gradually decreases in the direction away from the gear shaft 4, which is convenient for the entry of the first narrow strip. At the channel entrance of the second limiting channel, the distance between the third arc plate 15 and the fourth arc plate 16 gradually decreases in the direction away from the gear shaft 4, which is convenient for the entry of the second end of the toothed belt 3.

[0079] In one embodiment, the transmission box 6 includes a worm 61, a turbine 62 and a spur gear assembly 63, the worm 61 is fixedly connected to the power output end; the turbine 62 is meshed with the worm; the turbine 62 and the worm 61 form a self-locking mechanism; the spur gear assembly 63 is meshed with the turbine 62, and is provided with a D-type output shaft 64, and the D-type output shaft 64 is connected to the D-type hole 41 at the end of the gear shaft 4.

[0080] Through the high-density integrated transmission box 6, the transmission box 6 is miniaturized and combined into the housing assembly 1, so that the product volume of the entire blood pressure measurement device is small and strap-free, which is convenient for the elderly. In the cooperation between the worm 61 and the turbine 62, due to the setting of a suitable lead angle, the turbine 62 can be driven to rotate by the worm 61, but not vice versa, so the self-locking function is achieved to form a self-locking mechanism. The spur gear assembly 63 may include a plurality of coaxial spur gear members and an output spur gear, each coaxial spur gear member includes two coaxial and parallel spur gears with different radii, fixed to each other, and the plurality of coaxial spur gear members and the output spur gear are meshed in sequence; the output spur gear has a D-type output shaft 64, and the D-type output shaft 64 is coaxial with the output spur gear; through the transmission of the plurality of coaxial spur gear members and the output spur gear, the output is finally output through the D-type output shaft 64, so as to achieve the function of stable output. In this embodiment, the D-type output shaft 64 is a plane arranged along the axial direction on the outer periphery of the circular shaft to form an output shaft with a cross section similar to that of the D-type. The shape and size of the D-shaped hole 41 match the D-shaped output shaft 64 .

[0081] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A blood pressure measuring device, characterized in that: include: Housing assembly (1); A variable diameter ring (2) is arranged inside the housing assembly (1); The toothed belt (3) is cylindrical and sleeved on the outer circumference of the variable diameter ring (2); the outer surface of the first end of the toothed belt (3) is provided with a first rack (31), and the inner surface of the second end of the toothed belt (3) is provided with a second rack (32); A gear shaft (4) is rotatably connected in the housing assembly (1), is located between the first rack (31) and the second rack (32), and is meshed with both the first rack (31) and the second rack (32) for transmission; Driving mechanism (5); A transmission box (6) is transmission-connected to the gear shaft (4) and the power output end of the driving mechanism (5); a self-locking mechanism is provided in the transmission box (6); An airbag measuring assembly comprises an airbag (71), an air pump (72), a control valve (73) and an air pressure sensor (74); the airbag (71) is fixed on the inner side of the variable diameter ring (2) and is located between the first rack (31) and the second rack (32); the control valve (73) and the air pump (72) are both connected to the airbag (71); and the air pressure sensor (74) is used to detect the air pressure of the airbag (71); The control module comprises a control panel (81) and a display screen (82), wherein the display screen (82), the driving mechanism (5), the air pump (72), the control valve (73) and the air pressure sensor (74) are all communicatively connected to the control panel (81).

2. The blood pressure measuring device according to claim 1, characterized in that: A first avoidance opening (33) is provided on the second end of the toothed belt (3), the first avoidance opening (33) extends along the circumferential direction of the variable diameter ring (2), and the first avoidance opening (33) is provided with the second rack (32) on both sides of the axial direction of the variable diameter ring (2); a first narrow strip is protruding from the first end of the toothed belt (3) along the circumferential direction of the variable diameter ring (2), the first narrow strip corresponds to the position of the first avoidance opening (33), and is cross-connected through the first avoidance opening (33) to the outside of the toothed belt (3), and the first rack (31) is arranged on the first narrow strip.

3. The blood pressure measuring device according to claim 2, characterized in that: Also includes: A first limiting shaft (9) is rotatably connected in the housing assembly (1) and is located between the variable diameter ring (2) and the gear shaft (4); a first end of the toothed belt (3) is movably arranged between the first limiting shaft and the gear shaft (4); The second limiting shaft (10) is rotatably connected in the housing assembly (1) and is spaced apart from the second limiting shaft. The gear shaft (4) is located between the first limiting shaft and the second limiting shaft. The second end of the toothed belt (3) is movably passed through between the second limiting shaft and the gear shaft (4).

4. The blood pressure measuring device according to claim 3, characterized in that: It also includes a gear box shell (11) arranged inside the housing assembly (1); the first limit shaft (9) and the second limit shaft (10) are both detachably connected to the gear box shell (11); the gear box shell (11) is provided with through holes at both ends of the axial direction of the variable diameter ring (2), and connecting shafts are protruding from both ends of the gear shaft (4), and the two connecting shafts are rotatably inserted into the two through holes, and one of the connecting shafts is connected to the transmission box (6).

5. The blood pressure measuring device according to claim 4, characterized in that: A second avoidance opening and a third avoidance opening are respectively provided on both sides of the tooth box shell (11); the second avoidance opening is arranged on a side close to the variable diameter ring (2) in the radial direction of the variable diameter ring (2), and the width of the second avoidance opening in the axial direction of the variable diameter ring (2) is smaller than the width of the third avoidance opening; the first narrow strip passes through the two second avoidance openings in sequence, and the second end of the toothed belt (3) passes through the two third avoidance openings in sequence.

6. The blood pressure measuring device according to any one of claims 2 to 5, characterized in that: Also includes: A first limiting structure, arranged on the inner wall of the housing assembly (1), for limiting the movement of the first narrow strip that crosses and penetrates the outside of the toothed belt (3); The second limiting structure is arranged on the inner wall of the housing assembly (1) and is used to limit the movement of the second end of the toothed belt (3) after the crossing.

7. The blood pressure measuring device according to claim 6, characterized in that: The first limiting structure comprises a first arc-shaped plate (13) and a second arc-shaped plate (14), the first arc-shaped plate (13) and the second arc-shaped plate (14) are arranged opposite to each other and spaced apart to form an arc-shaped first limiting channel, and the first narrow strip cross-connected to the outside of the toothed belt (3) is movably arranged in the first limiting channel; And / or, the second limiting structure comprises a third arc plate (15) and a fourth arc plate (16), the third arc plate (15) and the fourth arc plate (16) are arranged opposite to each other and spaced apart to form an arc-shaped second limiting channel, and the second end of the crossed toothed belt (3) is movably arranged in the second limiting channel.

8. The blood pressure measuring device according to claim 1, characterized in that: A fourth avoidance opening (34) is provided on the first end of the toothed belt (3), and the fourth avoidance opening (34) extends along the circumferential direction of the variable diameter ring (2), and the first rack (31) is provided on both sides of the fourth avoidance opening (34) in the axial direction of the variable diameter ring (2); a second narrow strip is protruding from the second end of the toothed belt (3) along the circumferential direction of the variable diameter ring (2), and the second narrow strip corresponds to the position of the fourth avoidance opening (34), and is cross-pierced through the fourth avoidance opening (34) to the outside of the toothed belt (3), and the second rack (32) is arranged on the second narrow strip.

9. The blood pressure measuring device according to claim 8, characterized in that: It also includes a third limiting shaft (12), which is arranged at the intersection of the second narrow strip and the first end of the toothed belt (3), and is located on the side of the second narrow strip facing away from the second rack (32) and on the side of the first end of the toothed belt (3) facing away from the first rack (31); the gear shaft (4) is arranged at the intersection of the second narrow strip and the first end of the toothed belt (3), and is located on the side of the second narrow strip provided with the second rack (32) and on the side of the first end of the toothed belt (3) provided with the first rack (31).

10. The blood pressure measuring device according to any one of claims 1 to 5 or 7 to 9, characterized in that: The transmission box (6) comprises: A worm (61) fixedly connected to the power output end; a turbine (62) meshing with the worm (61); the turbine (62) and the worm (61) forming the self-locking mechanism; A spur gear assembly (63) is meshed with the turbine (62) and is provided with a D-shaped output shaft (64). The D-shaped output shaft (64) is connected to the D-shaped hole (41) at the end of the gear shaft (4).

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