Expander
By introducing a first hook and a second hook into the vaginal speculum, the locking process of the upper and lower leaves is simplified, solving the problem of cumbersome operation in the prior art and realizing convenient use of the vaginal speculum.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-03
- Publication Date
- 2026-04-03
AI Technical Summary
The existing method of locking the upper and lower leaf positions of vaginal speculum is cumbersome and affects the ease of use for medical staff.
The design employs a first hook and a second hook. After the first hook rotates with the upper leaf to a preset position, the swing arm drives the second hook to hook the first hook, thus achieving easy locking of the upper and lower leaves.
The locking operation of the upper and lower leaves has been simplified, preventing the upper leaf from returning to its original position due to vaginal closure, thus improving the ease of use for medical staff.
Smart Images
Figure CN224070427U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to an expander. Background Technology
[0002] Vaginal speculum is a medical device used in clinical practice for the diagnosis and screening of gynecological diseases. It plays an important role in premarital checkups, pregnancy checkups, and prenatal checkups.
[0003] Existing vaginal specula devices generally consist of an upper leaflet and a lower leaflet, which are rotatably connected to form an expansion structure. During use, medical personnel insert the specula device into the vagina and control the rotation of the upper leaflet relative to the lower leaflet, thereby creating a certain amount of space within the vagina. The internal condition of the vagina is then observed through a viewing window located on the upper leaflet for diagnostic purposes.
[0004] As described above, after medical staff control the upper leaf to rotate relative to the lower leaf to a preset working position to open the vagina to a certain space, the relative positions of the upper and lower leaves need to be fixed to facilitate subsequent diagnosis of the patient. In existing technologies, the relative positions of the upper and lower leaves are generally fixed using a screw structure. Specifically, after controlling the upper leaf to rotate relative to the lower leaf to the preset working position, medical staff manually tighten the screw or the locking nut on the screw to connect the upper and lower leaves together via the screw, or to lock the upper and lower leaves together using the locking nut and the head of the screw. Therefore, the method of locking the position of the upper and lower leaves of the dilator is cumbersome and inconvenient for medical staff to use. Utility Model Content
[0005] The purpose of this invention is to provide an expander with a simple operation method for locking the upper and lower blades, which makes it convenient for medical personnel to use.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] An expander includes an upper leaf and a lower leaf rotatably connected via a first pivot, the expander further comprising:
[0008] The swing arm is rotatably connected to the lower leaf via a second rotating shaft, the axis of the second rotating shaft being parallel to the axis of the first rotating shaft;
[0009] The first hook is disposed on the upper leaf and can rotate along the axis of the first rotating shaft in the first rotation direction toward the side closer to the second rotating shaft until a preset position is reached.
[0010] The second hook is disposed on the swing arm, which is capable of rotating around the axis of the second pivot in a second rotation direction, and the second hook is capable of hooking the first hook located at the preset position, and the hooking position is located on the side of the first hook away from the second pivot, and the second rotation direction is opposite to the first rotation direction.
[0011] Preferably, the preset position includes several preset points, the first hook can be rotated to several preset points in sequence, the second hook includes several hooks, the several hooks are arranged radially at intervals along the second rotating axis, and can hook the first hook at different preset points respectively.
[0012] Preferably, the swing arm extends radially along the second rotating shaft, which is located at one end of the swing arm. The second hook is provided with a first hook area, a second hook area, and a third hook area. The first hook area and the second hook area are arranged along the arrangement direction of a plurality of hooks. The first hook area is located close to the second rotating shaft, the second hook area is located away from the second rotating shaft, and the third hook area is located between the first hook area and the second hook area.
[0013] In the first hooking area, all the hooks are tilted toward the side away from the second pivot, and the closer the hook is to the second pivot, the greater the tilt.
[0014] In the second hooking area, all the hooks are tilted toward the side closer to the second pivot, and the tilt of the hooks closer to the second pivot is smaller;
[0015] One of the plurality of hooks is disposed in the third hooking area, and the hook located in the third hooking area is not tilted relative to the second pivot.
[0016] Preferably, the upper leaf is provided with two first hooks, and the two first hooks are arranged at intervals along the axial direction of the first rotating shaft;
[0017] The swing arm is provided with two second hooks, which are arranged at intervals along the axial direction of the second rotating shaft, and the two second hooks correspond one-to-one with the two first hooks.
[0018] Preferably, the upper leaf has a first mounting wall and a second mounting wall, which are arranged opposite to each other along the axial direction of the first rotating shaft. One of the two first hooks is formed on the first mounting wall, and the other of the two first hooks is formed on the second mounting wall.
[0019] Preferably, the upper leaf is provided with a through hole, and the two hole walls opposite each other along the axial direction of the first rotating shaft are the first mounting wall and the second mounting wall, respectively, and the swing arm passes through the through hole along the radial direction of the second rotating shaft.
[0020] Preferably, the upper leaf is provided with a pressure arm on one side along the axial direction of the first rotating shaft, and the through hole is provided on the pressure arm.
[0021] Preferably, a mounting plate is provided between the two second hooks, and both second hooks are formed on the mounting plate.
[0022] Preferably, the first hook has a first hook groove on the side away from the second pivot, so as to form a first protrusion on the side of the first hook away from the second pivot, and the second hook has a second hook groove on the side facing the second pivot, so as to form a second protrusion on the side of the second hook facing the second pivot. The first protrusion can move into the second hook groove, and the second protrusion can move into the first hook groove, so that the first hook and the second hook engage.
[0023] Preferably, the second rotating shaft is disposed on the swing arm, and a bearing sleeve is disposed on the lower blade, the bearing sleeve being sleeved on the outer periphery of the second rotating shaft.
[0024] The beneficial effects of this utility model are:
[0025] In this invention, when medical personnel control the upper leaf to rotate relative to the lower leaf to a preset working position to open the vagina into a preset space, the first hook rotates with the upper leaf to the preset position. Then, the medical personnel can control the swing arm to rotate around the axis of the second rotating shaft, so that the second hook hooks the first hook. The second hook can stop the first hook on the side away from the second rotating shaft, thereby preventing the upper leaf from returning to its original position, thus facilitating diagnosis by medical personnel. In other words, in this invention, after the upper leaf rotates relative to the lower leaf to the preset working position to open the vagina into a preset space, medical personnel only need to control the swing arm to lock the upper and lower leaves, preventing the upper leaf from returning to its original position due to vaginal closure. The operation is simple and convenient for medical personnel to use. Attached Figure Description
[0026] Figure 1 This is one of the structural schematic diagrams of the expander in the embodiments of this utility model;
[0027] Figure 2 This is the second schematic diagram of the expander in this embodiment of the utility model;
[0028] Figure 3 This is one of the structural schematic diagrams of the upper leaf in the embodiments of this utility model;
[0029] Figure 4 This is the second schematic diagram of the upper leaf structure in an embodiment of this utility model;
[0030] Figure 5 This is the third schematic diagram of the upper leaf structure in this embodiment of the utility model;
[0031] Figure 6 This is one of the structural schematic diagrams of the swing arm and the second hook in the embodiments of this utility model;
[0032] Figure 7 This is the second schematic diagram of the structure of the swing arm and the second hook in the embodiment of this utility model.
[0033] In the picture:
[0034] 1. Upper leaf; 11. Through hole; 111. First mounting wall; 112. Second mounting wall; 113. First baffle wall; 114. Second baffle wall; 12. Pressure arm; 13. Viewing window;
[0035] 2. Lower leaf; 21. Bearing sleeve;
[0036] 3. First rotating shaft;
[0037] 4. Swing arm; 41. Second pivot; 42. Mounting plate;
[0038] 5. First hook; 51. First hook groove; 52. First protrusion;
[0039] 6. Second hook; 61. Hook; 611. Second hook groove; 612. Second protrusion; 62. First hook area; 63. Second hook area; 64. Third hook area. Detailed Implementation
[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0043] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0044] Please see Figures 1 to 7 This embodiment provides a dilator, which includes an upper leaf 1 and a lower leaf 2 rotatably connected by a first rotating shaft 3 to form an expansion structure. In use, medical personnel insert the dilator into the vagina and control the upper leaf 1 to rotate relative to the lower leaf 2, thereby opening the dilator to create a certain space in the vagina. Then, the internal condition of the vagina can be observed through the viewing window 13 set on the upper leaf 1 for diagnosis.
[0045] Furthermore, after the medical staff controls the upper leaf 1 to rotate relative to the lower leaf 2 to the preset working position to open the vagina into the preset space, it is necessary to fix the relative positions of the upper leaf 1 and the lower leaf 2 to prevent the upper leaf 1 from returning to its original position due to the vagina closing, so that the vagina can remain open into the preset space, which makes it easier for the medical staff to diagnose the patient.
[0046] Therefore, in this embodiment, the dilator further includes a swing arm 4, a first hook 5, and a second hook 6. The swing arm 4 is rotatably connected to the lower leaf 2 via a second rotating shaft 41, and the axis of the second rotating shaft 41 is parallel to the axis of the first rotating shaft 3. The first hook 5 is disposed on the upper leaf 1 and can rotate with the upper leaf 1 around the axis of the first rotating shaft 3 in a first rotation direction toward the side closer to the second rotating shaft 41 until a preset position is reached. It can be understood that the preset position is the position of the first hook 5 after the upper leaf 1 rotates relative to the lower leaf 2 to a preset working position to open the vagina into a preset space.
[0047] The second hook 6 is mounted on the swing arm 4. The swing arm 4 can rotate around the axis of the second rotating shaft 41 in the second rotation direction, and the second hook 6 can hook the first hook 5 located at a preset position. The hook position is located on the side of the first hook 5 away from the second rotating shaft 41. It can be understood that the second rotation direction is opposite to the first rotation direction.
[0048] Therefore, in this embodiment, when the medical staff controls the upper leaf 1 to rotate relative to the lower leaf 2 to a preset working position to open the vagina into a preset space, the first hook 5 rotates with the upper leaf 1 to the preset position. Then, the medical staff can control the swing arm 4 to rotate around the axis of the second rotating shaft 41 so that the second hook 6 hooks the first hook 5. The second hook 6 can stop the first hook 5 on the side away from the second rotating shaft 41, thereby preventing the upper leaf 1 from returning to its original position, thus facilitating the medical staff's diagnosis of the patient. That is, in this embodiment, when the upper leaf 1 rotates relative to the lower leaf 2 to a preset working position to open the vagina into a preset space, the medical staff only needs to control the swing arm 4 to lock the upper leaf 1 and lower leaf 2, preventing the upper leaf 1 from returning to its original position due to vaginal closure. The operation is simple and convenient for medical staff to use.
[0049] Furthermore, the first hook 5 is provided with a first hook groove 51 on the side away from the second rotating shaft 41, so as to form a first protrusion 52 on the side of the first hook 5 away from the second rotating shaft 41. The second hook 6 is provided with a second hook groove 611 on the side facing the second rotating shaft 41, so as to form a second protrusion 612 on the side of the second hook 6 facing the second rotating shaft 41. When the upper leaf 1 rotates relative to the lower leaf 2 to a preset working position to open the vagina into a preset space, the first hook 5 rotates with the upper leaf 1 to the preset position. Then, the medical staff operates the swing arm 4 and drives the second hook 6 to rotate, so that the first protrusion 52 can move into the second hook groove 611, and the second protrusion 612 can move into the first hook groove 51, so that the first hook 5 and the second hook 6 engage, thereby realizing that the second hook 6 hooks the first hook 5 located in the preset position.
[0050] It is worth noting that the friction between the first hook 5 and the second hook 6, which are engaged by the first protrusion 52 and the second protrusion 612, is relatively large and has a strong anti-slip ability, thereby ensuring that the second hook 6 can more reliably stop on the side of the first hook 5 away from the second pivot 41.
[0051] Additionally, it should be noted that in actual use, the expander needs to have several opening angles. Different opening angles correspond to different preset working positions. Medical staff will select one of the opening angles according to the patient's actual situation. That is, in actual use, medical staff will control the upper leaf 1 to rotate relative to the lower leaf 2 to one of the preset working positions according to the patient's actual situation.
[0052] As shown above, the upper leaf 1 has several preset working positions. Correspondingly, for the first hook 5 set on the upper leaf 1, the preset positions include several preset points. The first hook 5 can rotate to several preset points in sequence. In actual use, medical staff control the upper leaf 1 to rotate relative to the lower leaf 2 to one of the preset working positions according to the patient's actual situation, and drive the first hook 5 to rotate to the corresponding preset point.
[0053] Based on the above, the second hook 6 includes a plurality of hooks 61, which are arranged radially at intervals along the second rotating shaft 41 and can hook the first hook 5 at different preset points. That is, the plurality of hooks 61 correspond one-to-one with the plurality of preset points, and the plurality of hooks 61 can hook the first hook 5 at the plurality of preset points respectively.
[0054] For example, this embodiment uses the second hook 6, which includes four hooks 61, as an example. The upper leaf 1 has four preset working positions. Correspondingly, for the first hook 5 set on the upper leaf 1, the preset positions include four preset points. The four hooks 61 are arranged radially at intervals along the second rotating shaft 41 and correspond one-to-one with the four preset points. In actual use, medical staff control the upper leaf 1 to rotate relative to the lower leaf 2 to one of the preset working positions according to the patient's actual situation, and drive the first hook 5 to rotate to the corresponding preset point. Then, the medical staff can control the rotation angle of the swing arm 4, so that the hook 61 corresponding to the preset point can hook the first hook 5.
[0055] It is worth noting that, based on the above description, in this embodiment, all hooks 61 are provided with a second hook groove 611, so that all hooks 61 form a second protrusion 612, and all hooks 61 can hook the first hook 5 through the second protrusion 612.
[0056] Moreover, in this embodiment, the surfaces of the first protrusion 52 and the second protrusion 612 are both arc surfaces, which facilitates the first protrusion 52 to move into the second hook groove 611 and the second protrusion 612 to move into the first hook groove 51.
[0057] Furthermore, the swing arm 4 extends radially along the second rotating shaft 41, and the second rotating shaft 41 is located at one end of the swing arm 4. The second hook 6 is provided with a first hook area 62, a second hook area 63 and a third hook area 64. The first hook area 62 and the second hook area 63 are arranged along the arrangement direction of a plurality of hooks 61. The first hook area 62 is located close to the second rotating shaft 41, the second hook area 63 is located away from the second rotating shaft 41, and the third hook area 64 is located between the first hook area 62 and the second hook area 63.
[0058] In the first hooking area 62, all hooks 61 are tilted toward the side away from the second pivot 41, and the closer the hook 61 is to the second pivot 41, the greater the tilt.
[0059] In the second hooking area 63, all hooks 61 are tilted toward the side closer to the second pivot 41, and the closer the hook 61 is to the second pivot 41, the smaller the tilt angle.
[0060] In addition, one of the several hooks 61 is located in the third hook area 64, and the hook 61 located in the third hook area 64 is not tilted relative to the second pivot 41.
[0061] Therefore, this embodiment will still take the second hook 6, which includes four hooks 61, as an example for explanation. Among the four hooks 61, the hook 61 closest to the second pivot 41 is located in the first hooking area 62, the two hooks 61 furthest from the second pivot 41 are located in the second hooking area 63, and the remaining hook 61 is located in the third hooking area 64. Thus, in this embodiment, the inclination of the hook 61 corresponding to each preset point is adapted to the inclination of the first hook 5 when it rotates to the preset point. This further ensures that when the first hook 5 rotates to one of the preset points in actual use, the hook 61 corresponding to the preset point can hook the first hook 5 more securely, and the two are less likely to slip off. This further ensures that the second hook 6 can more reliably stop the first hook 5 on the side away from the second pivot 41.
[0062] Of course, in other optional embodiments, depending on the actual number and actual location of the preset points, two or more hooks 61 may be set in the first hooking area 62, and three or more hooks 61 may be set in the second hooking area 63. This embodiment does not impose specific restrictions on this.
[0063] In addition, in this embodiment, two first hooks 5 are provided on the upper leaf 1, and the two first hooks 5 are arranged at intervals along the axial direction of the first rotating shaft 3. Correspondingly, two second hooks 6 are provided on the swing arm 4, and the two second hooks 6 are arranged at intervals along the axial direction of the second rotating shaft 41. The two second hooks 6 are arranged in a one-to-one correspondence with the two first hooks 5. That is, in this embodiment, the two second hooks 6 hook the two first hooks 5 respectively, so as to more reliably fix the relative position of the upper leaf 1 and the lower leaf 2.
[0064] Furthermore, in this embodiment, the upper leaf 1 is formed with a first mounting wall 111 and a second mounting wall 112. The first mounting wall 111 and the second mounting wall 112 are arranged opposite each other along the axial direction of the first rotating shaft 3. One of the two first hooks 5 is formed on the first mounting wall 111, and the other of the two first hooks 5 is formed on the second mounting wall 112. This can improve the structural strength of the two first hooks 5, thereby further ensuring that the second hook 6 can more reliably stop on the side of the first hook 5 away from the second rotating shaft 41.
[0065] As shown above, the upper leaf 1 is provided with a through hole 11. The two hole walls of the through hole 11 that are opposite each other along the axial direction of the first rotating shaft 3 are the first mounting wall 111 and the second mounting wall 112. In addition, the first mounting wall 111 and the second mounting wall 112 form a first baffle wall 113 and a second baffle wall 114. The first mounting wall 111, the second mounting wall 112, the first baffle wall 113 and the second baffle wall 114 together constitute all the hole walls of the through hole 11. The swing arm 4 passes through the through hole 11 radially along the second rotating shaft 41. One of the two first hooks 5 is formed on the first baffle wall 113 and the first mounting wall 111, and the other of the two first hooks 5 is formed on the first baffle wall 113 and the second mounting wall 112, thereby further improving the structural strength of the two first hooks 5.
[0066] Furthermore, based on the above, when the expander is not in use, the swing arm 4 rests against the second baffle 114. When medical personnel control the upper leaf 1 to rotate relative to the lower leaf 2, the swing arm 4 can move within the through hole 11. After the first hook 5 rotates to the preset position, the medical personnel operate the swing arm 4 to rotate towards the side closer to the first hook 5. Because the swing arm 4 is stopped by the hole wall of the through hole 11, the swing arm 4 and the first hook 5 always maintain a relatively close distance when the medical personnel control the upper leaf 1 to rotate relative to the lower leaf 2. This makes it convenient for the medical personnel to operate the swing arm 4 to rotate towards the side closer to the first hook 5 after rotating the first hook 5 to the preset position. That is, this embodiment can further reduce the difficulty of locking the relative position of the upper leaf 1 and the lower leaf 2, and thus make it more convenient for medical personnel to use.
[0067] It is understandable that as the angle of rotation of the upper leaf 1 along the first rotation direction increases, the swing arm 4 will first rotate along the first rotation direction with the upper leaf 1. Then, after the first hook 5 rotates to the preset position, the medical staff will operate the swing arm 4 to rotate along the second rotation direction so that the second hook 6 hooks the first hook 5, and the hook 61 that hooks the first hook 5 is relatively closer to the second rotating shaft 41.
[0068] It is also worth noting that a pressure arm 12 is provided on one side of the upper leaf 1 along the axial direction of the first rotating shaft 3. Medical staff can manipulate the upper leaf 1 to rotate around the axis of the first rotating shaft 3 through the pressure arm 12. The through hole 11 is provided on the pressure arm 12, so that the swing arm 4 is located on one side of the upper leaf 1 along the axial direction of the first rotating shaft 3, thereby avoiding affecting the medical staff's observation of the vaginal interior through the viewing window 13 provided on the upper leaf 1.
[0069] In addition, a mounting plate 42 is provided between the two second hooks 6. Both second hooks 6 are formed on the mounting plate 42. Specifically, one second hook 6 is formed on one side of the mounting plate 42 along the axial direction of the second rotating shaft 41, and the other second hook 6 is formed on the other side of the mounting plate 42 along the axial direction of the second rotating shaft 41. This can increase the structural strength of the second hooks 6, and further ensure that the second hooks 6 can more reliably stop on the side of the first hook 5 away from the second rotating shaft 41.
[0070] Furthermore, in this embodiment, the second rotating shaft 41 is disposed on the swing arm 4, and a bearing sleeve 21 is disposed on the lower leaf 2. The bearing sleeve 21 is disposed on the outer periphery of the second rotating shaft 41, thereby ensuring that the swing arm 4 can rotate smoothly around the axis of the second rotating shaft 41, which makes it more convenient for medical staff to operate the swing arm 4 to rotate towards the side closer to the first hook 5 after rotating the first hook 5 to the preset position.
[0071] Understandably, after the diagnosis, medical staff only need to manipulate the swing arm 4 to rotate around the axis of the second pivot 41 to the side away from the first hook 5, so that the second hook 6 can disengage from the first hook 5, thereby allowing the upper leaf 1 and the lower leaf 2 to return to the closed state, thus facilitating the removal of the expander.
[0072] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. An expander comprising an upper blade (1) and a lower blade (2) rotatably connected via a first rotating shaft (3), characterized in that, The expander also includes: The swing arm (4) is rotatably connected to the lower leaf (2) via a second rotating shaft (41), the axis of the second rotating shaft (41) being parallel to the axis of the first rotating shaft (3); The first hook (5) is disposed on the upper leaf (1) and can rotate along the axis of the first rotating shaft (3) in the first rotation direction toward the side closer to the second rotating shaft (41) until the preset position is reached. The second hook (6) is disposed on the swing arm (4). The swing arm (4) can rotate around the axis of the second rotating shaft (41) in the second rotation direction, and the second hook (6) can hook the first hook (5) located at the preset position. The hook position is located on the side of the first hook (5) away from the second rotating shaft (41). The second rotation direction is opposite to the first rotation direction.
2. An expander according to claim 1, characterized in that, The preset position includes several preset points. The first hook (5) can rotate to several preset points in sequence. The second hook (6) includes several hooks (61). The several hooks (61) are arranged radially at intervals along the second rotating shaft (41) and can hook the first hook (5) at different preset points respectively.
3. An expander according to claim 2, characterized in that, The swing arm (4) extends radially along the second rotating shaft (41), which is located at one end of the swing arm (4). The second hook (6) is provided with a first hook area (62), a second hook area (63), and a third hook area (64). The first hook area (62) and the second hook area (63) are arranged along the arrangement direction of a plurality of hooks (61). The first hook area (62) is located close to the second rotating shaft (41), the second hook area (63) is located away from the second rotating shaft (41), and the third hook area (64) is located between the first hook area (62) and the second hook area (63). In the first hook area (62), all the hooks (61) are tilted toward the side away from the second pivot (41), and the closer the hook (61) is to the second pivot (41), the greater the tilt. In the second hook area (63), all the hooks (61) are tilted toward the side closer to the second pivot (41), and the tilt of the hooks (61) closer to the second pivot (41) is smaller; One of the plurality of hooks (61) is disposed in the third hooking area (64), and the hook (61) located in the third hooking area (64) is not tilted relative to the second pivot (41).
4. An expander according to claim 1, characterized in that, The upper leaf (1) is provided with two first hooks (5), and the two first hooks (5) are arranged at intervals along the axial direction of the first rotating shaft (3); The swing arm (4) is provided with two second hooks (6), which are arranged at intervals along the axial direction of the second rotating shaft (41). The two second hooks (6) correspond one-to-one with the two first hooks (5).
5. An expander according to claim 4, characterized in that, The upper leaf (1) is formed with a first mounting wall (111) and a second mounting wall (112). The first mounting wall (111) and the second mounting wall (112) are arranged opposite each other along the axial direction of the first rotating shaft (3). One of the two first hooks (5) is formed on the first mounting wall (111), and the other of the two first hooks (5) is formed on the second mounting wall (112).
6. An expander according to claim 5, characterized in that, The upper leaf (1) is provided with a through hole (11), and the two opposite holes of the through hole (11) along the axial direction of the first rotating shaft (3) are the first mounting wall (111) and the second mounting wall (112), respectively. The swing arm (4) passes through the through hole (11) along the radial direction of the second rotating shaft (41).
7. An expander according to claim 6, characterized in that, The upper leaf (1) is provided with a pressure arm (12) on one side along the axial direction of the first rotating shaft (3), and the through hole (11) is provided on the pressure arm (12).
8. An expander according to claim 4, characterized in that, An mounting plate (42) is provided between the two second hooks (6), and both second hooks (6) are formed on the mounting plate (42).
9. An expander according to claim 1, characterized in that, The first hook (5) is provided with a first hook groove (51) on the side away from the second pivot (41) to form a first protrusion (52) on the side away from the second pivot (41). The second hook (6) is provided with a second hook groove (611) on the side facing the second pivot (41) to form a second protrusion (612) on the side facing the second pivot (41). The first protrusion (52) can move into the second hook groove (611), and the second protrusion (612) can move into the first hook groove (51) so that the first hook (5) and the second hook (6) engage.
10. An expander according to claim 1, characterized in that, The second rotating shaft (41) is disposed on the swing arm (4), and a bearing sleeve (21) is disposed on the lower leaf (2), the bearing sleeve (21) being sleeved on the outer periphery of the second rotating shaft (41).