A smoke suction speculum

By designing a suction head and a smoke suction tube with multiple suction holes on the snoop, the poor smoking effect and smoke leakage caused by the small cross-sectional area of ​​the existing suction tube tube is solved, and more efficient smoke attraction and wider application scenarios are achieved.

CN222693430UActive Publication Date: 2025-04-01THE SECOND AFFILIATED HOSPITAL ARMY MEDICAL UNIV
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Patent Information

Application Number
CN202421651566.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-12
Publication Date
2025-04-01
Estimated Expiration
2034-07-12

AI Technical Summary

Technical Problem

The existing suction pipe mouth section area is limited, resulting in a single point of smoking smoke when smoking, which has poor suction effect and a high probability of smoke leakage.

Method used

A smoke suction voyeur is designed, and two smoking components are adopted, each of which includes a smoke suction tube and a suction head. A multiple suction hole is provided on the suction head. The total area of ​​the suction hole is greater than the area of ​​the inner wall of the suction tube. The suction head can be detached and magnetically absorbed through a magnet and the inner wall of the suction head. A magnet is embedded on the suction head for disassembly.

Benefits of technology

Smoke is attracted through multiple suction holes, which increases the smoking area, reduces the probability of smoke leakage, improves the suction efficiency, avoids smoke leakage, and removes the suction head when there is no need to attract smoke, increasing the application scenario of the vitiligo.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a smoke suction speculum, which belongs to the field of speculum. In order to achieve the above-mentioned purpose and other related purposes, the speculum includes an area between the upper leaf and the lower leaf as an open area; the first smoking component and the second smoking component are respectively arranged on the upper leaf and the lower leaf, and both include a smoke suction tube and a suction head; the suction head is located at the front of the open area, a cavity is opened in the suction head, and a plurality of suction holes are opened on the suction head, the suction holes connect the cavity with the external space, one end of the smoke suction tube passes through the suction head and connects the cavity, and the smoke suction tube extends outward and extends out of the open area. The suction head provided in the present application can suck smoke through the plurality of suction holes on the suction head when smoke is generated, and the smoking area is large, which can reduce the probability of smoke leakage. At the same time, the suction heads are arranged on both the upper leaf and the lower leaf, which can increase the efficiency of sucking smoke and further avoid the possibility of smoke leakage.
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Description

Technical Field

[0001] The utility model belongs to the field of vaginal speculum, in particular to a smoke suction vaginal speculum. Background Art

[0002] When using laparoscopes for gynecological surgery, there are two ways to allow surgical instruments to enter the abdominal cavity. One is to make an opening in the abdomen and insert a catheter into the opening to allow surgical instruments to enter the abdominal cavity through the catheter. The other is to use a speculum to open the vagina and then pass the surgical instruments through the opened vagina into the abdominal cavity. In gynecological surgery, electrocoagulation and electroresection will produce smoke. In order to ensure that the surgical field is fully exposed, the smoke needs to be sucked out in real time.

[0003] Patent CN217566145U discloses "a speculum with lighting and negative pressure suction functions", which specifically discloses that a cold light tube is set on the inner side of the upper leaf, and a suction pipe is set on the inner side of the lower leaf channel end. The suction pipe extends downward to a handle connected to a negative pressure suction device, and the suction pipe is used to suck the smoke during the operation through the negative pressure suction device. However, due to the limited cross-sectional area of ​​the suction tube orifice, when smoking, the smoke is sucked through a single point, the suction effect is poor, and the probability of smoke leakage is high.

[0004] In summary, the existing problem of the smoking-type speculum is that the cross-sectional area of ​​the existing suction tube opening is limited, and when smoking, the smoke is sucked through a single point, the suction effect is poor, and the probability of smoke leakage is high. Utility Model Content

[0005] In view of the shortcomings of the prior art mentioned above, the purpose of the utility model is to provide a smoke suction speculum, which is used to solve the problem that the cross-sectional area of ​​the existing suction tube orifice in the prior art is limited, smoke is sucked through a single point when smoking, the suction effect is poor, and the probability of smoke leakage is high.

[0006] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a smoke suction vaginal speculum, the vaginal speculum comprising:

[0007] Upper leaves,

[0008] The lower leaf is configured to open and close between the upper leaf and the lower leaf to open the vaginal wall, and the area between the upper leaf and the lower leaf is the opening area;

[0009] Two smoking components, the two smoking components are respectively a first smoking component and a second smoking component, the first smoking component is arranged on the inner wall of the upper leaf, and the second smoking component is arranged on the inner wall of the lower leaf, and the first smoking component and the second smoking component both include a smoke suction pipe and a suction head; the suction head is located at the front of the support area, and the suction head is detachably installed between the upper leaf and the lower leaf, a cavity is opened in the suction head, and a plurality of suction holes are opened on the suction head, and the suction holes connect the cavity with the external space, one end of the smoke suction pipe passes through the suction head and connects with the cavity, and the smoke suction pipe extends outward and extends out of the support area.

[0010] As an optional solution, a plurality of the air suction holes are arranged in an array along the length direction of the suction head, and the sum of the cross-sectional areas of the plurality of the air suction holes is larger than the cross-sectional area of ​​the inner wall of the smoke suction pipe.

[0011] As an optional solution, the length direction of the suction head is parallel to the width direction of the lower leaf.

[0012] As an optional solution, a magnet is embedded in the attraction head, and the upper leaf and the lower leaf are made of magnetically attractive materials;

[0013] The suction head of one of the smoking components is a first suction head, and the suction head of the other smoking component is a second suction head;

[0014] The magnet on the first attraction head is magnetically attracted to the inner wall of the upper leaf, and the magnet on the second attraction head is magnetically attracted to the inner wall of the lower leaf.

[0015] As an optional solution, the smoke suction tube is a hose.

[0016] As an optional solution, the first smoking assembly further includes a through slot, a mounting block and a first through hole;

[0017] The through slot is opened on the upper leaf, the length direction of the through slot is parallel to the length direction of the upper leaf, the plane where the left side wall of the through slot is located is the first plane, the plane where the right side wall of the through slot is located is the second plane, and there is an acute angle between the first plane and the second plane;

[0018] The mounting block is inserted into the through slot, and the side wall of the mounting block is in contact with the side wall of the through slot;

[0019] A first through hole is formed through the mounting block, and an axial direction of the first through hole is parallel to a length direction of the upper leaf;

[0020] The smoke suction pipe of the first smoking component extends from one end of the first through hole and extends from the other end of the first through hole, and the first through hole extension section of the smoke suction pipe of the first smoking component is connected to the cavity of the suction head of the first smoking component.

[0021] As an optional solution, a plurality of light-transmitting through grooves are formed through the bottom end surface of the mounting block, and the light-transmitting through grooves penetrate the bottom end surface of the mounting block and communicate with the first through hole.

[0022] As an optional solution, the lower leaf is L-shaped, and the L-shaped lower leaf includes a horizontal leaf and a vertical leaf; at least one second through hole is opened through the horizontal leaf, and at least one third through hole is opened through the vertical leaf; the smoke suction pipe passes through the second through hole on the horizontal leaf and the third through hole on the vertical leaf in sequence.

[0023] As an optional solution, the speculum further includes a connecting bracket;

[0024] The area between the horizontal leaf and the upper leaf is the open area, and the connecting bracket is slidably mounted on the vertical leaf, and the sliding direction of the connecting bracket is parallel to the length direction of the vertical leaf;

[0025] The upper leaf is rotatably mounted on the top of the connecting bracket, and the rotation axis of the upper leaf is perpendicular to the length direction of the vertical leaf, and the rotation axis of the upper leaf is also perpendicular to the length direction of the horizontal leaf.

[0026] As an optional solution, the speculum further includes a locking assembly for locking the relative sliding between the connecting bracket and the vertical leaf, and the locking assembly includes a sliding sleeve and a screw rod;

[0027] The sliding sleeve is slidably sleeved outside the connecting bracket and the vertical leaf;

[0028] The screw rod passes through the sliding sleeve and is connected to the front wall of the bracket to contact the front wall, and the screw rod is threadedly connected to the sliding sleeve.

[0029] As described above, the smoke suction speculum of the utility model has at least the following beneficial effects:

[0030] 1. The suction head provided in the present application can be used to suck smoke through a number of suction holes on the suction head when smoke is generated, so that the smoking area is larger and the probability of smoke leakage can be reduced. At the same time, suction heads are provided on both the upper and lower leaves, which can increase the efficiency of sucking smoke and further avoid the possibility of smoke leakage;

[0031] 2. The present application magnetically attracts the magnet on the first attraction head to the inner wall of the upper leaf, and magnetically attracts the magnet on the second attraction head to the inner wall of the lower leaf. When smoke attraction is not needed, the attraction head can be removed, and the device becomes a common spectacles, thereby increasing the application scenarios of spectacles.

[0032] 3. By setting up a light-transmitting groove in the present application, when there is no need to absorb smoke, the smoke suction tube of the first smoking component can be taken out, and the light-guiding optical fiber can be inserted into the first through hole, so as to provide lighting in and in front of the expanded area, thereby further increasing the application scenarios of the speculum. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The display is a schematic diagram of the structure of the utility model;

[0034] Figure 2 Shown is a structural cross-sectional view of the suction head of the utility model;

[0035] Figure 3 Shown is a structural cross-sectional view of the mounting block of the utility model;

[0036] Figure 4 Shown is a schematic structural diagram of the lower leaf of the utility model;

[0037] Figure 5 Shown is a schematic structural diagram of the screw rod of the utility model.

[0038] In the figure: 101, upper lobe; 102, lower lobe;

[0039] 201, smoke suction tube; 202, suction head; 203, cavity; 204, suction hole;

[0040] 301. Magnet;

[0041] 401, through slot; 402, mounting block; 403, first through hole; 404, light-transmitting through slot;

[0042] 501, horizontal leaves; 502, vertical leaves;

[0043] 601, second through hole; 602, third through hole;

[0044] 701, connecting bracket; 702, sliding sleeve; 703, screw rod. DETAILED DESCRIPTION

[0045] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0046] See also Figures 1 to 5. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the utility model without substantially changing the technical content.

[0047] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0048] See also Figures 1 to 5 The utility model provides a smoke suction vaginal speculum, which comprises:

[0049] Upper Leaf 101,

[0050] The lower leaf 102 is configured to open and close between the upper leaf 101 and the lower leaf 102 to open the vaginal wall, and the area between the upper leaf 101 and the lower leaf 102 is the opening area;

[0051] Two smoking components, the two smoking components are respectively a first smoking component and a second smoking component, the first smoking component is arranged on the inner wall of the upper leaf 101, and the second smoking component is arranged on the inner wall of the lower leaf 102, and the first smoking component and the second smoking component both include a smoke suction pipe 201 and a suction head 202;

[0052] The suction head 202 is located at the front part of the expanded area, and the suction head 202 is detachably installed between the upper leaf 101 and the lower leaf 102. A cavity 203 is opened in the suction head 202, and a plurality of suction holes 204 are opened on the suction head 202. The suction holes 204 connect the cavity 203 with the external space. One end of the smoke suction pipe 201 passes through the suction head 202 and connects with the cavity 203, and the other end of the smoke suction pipe 201 extends outward and extends out of the expanded area, and the other end of the smoke suction pipe 201 is connected to an external suction device.

[0053] When smoke is generated, smoke in the expanded area can be sucked through the smoke suction tube 201, the cavity 203 and the suction hole 204. At the same time, the smoking area is larger through the provision of a plurality of suction holes 204, which can reduce the probability of smoke leakage. In addition, suction heads 202 are provided on both the upper leaf 101 and the lower leaf 102, which can increase the efficiency of sucking smoke and further avoid the possibility of smoke leakage.

[0054] In this embodiment, please refer to Figures 1 to 5 , the plurality of air suction holes 204 are arranged in an array along the length direction of the suction head 202, and the sum of the cross-sectional areas of the plurality of air suction holes 204 is greater than the cross-sectional area of ​​the inner wall of the smoke suction pipe 201;

[0055] The length direction of the suction head 202 is parallel to the width direction of the lower leaf 102 .

[0056] A plurality of suction holes 204 are arranged along the width direction of the lower leaf 102, so as to absorb the smoke in the expanded area over a large area, thereby avoiding the possibility of smoke leakage.

[0057] In this embodiment, please refer to Figures 1 to 5 , the magnet 301 is embedded in the attraction head 202, the air suction hole 204 is opened on the top wall of the attraction head 202, and the magnet 301 is embedded in the bottom wall of the attraction head 202, that is, the air suction hole 204 and the magnet 301 are respectively located on opposite sides of the attraction head 202;

[0058] The upper leaf 101 and the lower leaf 102 are both made of magnetically attractive materials;

[0059] The material of the upper blade 101 and the lower blade 102 is not limited here, and can be iron, etc.;

[0060] The suction head of one of the smoking components is a first suction head, and the suction head of the other smoking component is a second suction head;

[0061] The magnet on the first attraction head is magnetically attracted to the inner wall of the upper leaf 101 , and the magnet on the second attraction head is magnetically attracted to the inner wall of the lower leaf 102 .

[0062] By means of the magnet 301, the first suction head and the second suction head can be removed when smoke suction is not needed.

[0063] In this embodiment, please refer to Figures 1 to 5 The smoke suction pipe 201 is a hose.

[0064] In this embodiment, please refer to Figures 1 to 5 , the first smoking assembly further includes a through slot 401, a mounting block 402 and a first through hole 403;

[0065] The through slot 401 is formed on the upper leaf 101, and the length direction of the through slot 401 is parallel to the length direction of the upper leaf 101. The plane where the left side wall of the through slot 401 is located is a first plane, and the plane where the right side wall of the through slot 401 is located is a second plane. The first plane and the second plane form an acute angle.

[0066] By setting the first plane and the second plane to form an acute angle, after the mounting block 402 is mounted in the through groove 401, it is possible to prevent the mounting block 402 from falling out of the upper leaf 101;

[0067] The mounting block 402 is inserted into the through slot 401, and the side wall of the mounting block 402 is in contact with the side wall of the through slot 401;

[0068] At the same time, in order to ensure that the mounting block 402 does not protrude from the upper end surface of the upper blade 101, after the mounting block 402 is fully inserted into the through slot 401, the upper end surface of the mounting block 402 is flush with the upper end surface of the upper blade 101;

[0069] A first through hole 403 is formed through the mounting block 402, and the axial direction of the first through hole 403 is parallel to the length direction of the upper leaf 101;

[0070] The cross section of the mounting block 402 is not limited here. Its main function is to define the upper and lower positions of the smoke suction pipe of the first smoking component. Its cross section can be circular or trapezoidal.

[0071] The smoke suction pipe of the first smoking component extends from one end of the first through hole 403 and extends from the other end of the first through hole 403, and the first through hole 403 extending section of the smoke suction pipe of the first smoking component is connected to the cavity 203 of the suction head of the first smoking component;

[0072] Here, a rigid connecting tube can be fixedly connected to the suction head 202, and the rigid connecting tube is connected to the cavity 203 of the suction head 202, and the smoke suction tube of the first smoking component is inserted into the rigid connecting tube, so that the smoke suction tube of the first smoking component can be connected to the cavity 203 of the suction head 202.

[0073] In this embodiment, please refer to Figures 1 to 5 The bottom end surface of the mounting block 402 is penetrated by a plurality of light-transmitting through grooves 404 , and the light-transmitting through grooves 404 penetrate the bottom end surface of the mounting block 402 and are connected to the first through hole 403 .

[0074] When smoke suction is not needed, the smoke suction tube of the first smoking component can be taken out, and the light-guiding optical fiber can be inserted into the first through hole 403 to provide lighting in and in front of the expanded area, thereby further increasing the application scenarios of the speculum.

[0075] In this embodiment, please refer to Figures 1 to 5 , the lower leaf 102 is L-shaped, and the L-shaped lower leaf 102 includes a horizontal leaf 501 and a vertical leaf 502;

[0076] At least one second through hole 601 is formed through the horizontal leaf 501 , and at least one third through hole 602 is formed through the vertical leaf 502 ; the smoke suction pipe 201 passes through the second through hole 601 on the horizontal leaf 501 and the third through hole 602 on the vertical leaf 502 in sequence.

[0077] Since the smoke suction tube 201 is a hose, when the smoke suction tube 201 passes through the second through hole 601 and the third through hole 602 in sequence, it can be stuck on the second through hole 601 and the third through hole 602, thereby fixing the smoke suction tube of the second smoking component.

[0078] In this embodiment, please refer to Figures 1 to 5 , the speculum further includes a connecting bracket 701;

[0079] The area between the horizontal leaf 501 and the upper leaf 101 is the open area, and the connecting bracket 701 is slidably mounted on the vertical leaf 502, and the sliding direction of the connecting bracket 701 is parallel to the length direction of the vertical leaf 502;

[0080] The relative sliding between the connecting bracket 701 and the vertical leaf 502 can increase the distance between the upper leaf 101 and the lower leaf 102, thereby increasing the height of the expansion area;

[0081] The upper blade 101 is rotatably mounted on the top of the connecting bracket 701 , and the rotation axis of the upper blade 101 is perpendicular to the length direction of the vertical blade 502 , and the rotation axis of the upper blade 101 is also perpendicular to the length direction of the horizontal blade 501 .

[0082] In order to lock the rotation angle of the upper leaf 101, an angle locking assembly can be arranged between the upper leaf 101 and the connecting bracket 701, and the angle locking assembly includes a connecting block, a waist-shaped hole, a threaded rod and a nut knob. The connecting block is fixedly mounted on the upper leaf 101, and the waist-shaped hole is opened through the connecting block. The threaded rod passes through the waist-shaped hole and is rotatably connected to the connecting bracket 701. The rotation axis of the threaded rod is parallel to the rotation axis of the upper leaf. The nut knob is spirally connected to the threaded rod. The nut knob is in contact with the connecting block, and the connecting block is located between the nut knob and the connecting bracket 701.

[0083] The upper leaf 101 rotates, and the connecting block rotates toward the connecting bracket 701. When the connecting block contacts the connecting bracket 701, the upper leaf 101 rotates to the maximum angle. At this time, the nut knob is rotated to make the nut knob contact with the connecting block, thereby locking the rotation angle of the upper leaf 101.

[0084] In this embodiment, please refer to Figures 1 to 5 The speculum further includes a locking assembly for locking the relative sliding between the connecting bracket 701 and the vertical leaf 502, and the locking assembly includes a sliding sleeve 702 and a screw rod 703;

[0085] The sliding sleeve 702 is slidably sleeved outside the connecting bracket 701 and the vertical blade 502;

[0086] Due to the existence of the sliding sleeve 702, the gap between the connecting bracket 701 and the vertical leaf 502 is zero at this time, and the connecting bracket 701 and the vertical leaf 502 can slide relative to each other and will not fall apart;

[0087] The screw rod 703 passes through the sliding sleeve 702 and is connected to the front wall of the bracket 701 to contact the front wall. The screw rod 703 is threadedly connected to the sliding sleeve 702 .

[0088] When the relative position between the connecting bracket 701 and the vertical leaf 502 needs to be locked, the screw rod 703 is rotated so that the end of the screw rod 703 moves toward the front wall of the connecting bracket 701, thereby locking the position between the connecting bracket 701 and the vertical leaf 502.

[0089] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A smoke suction speculum, characterized in that: The speculum comprises: Upper leaves, The lower leaf is configured to open and close between the upper leaf and the lower leaf to open the vaginal wall, and the area between the upper leaf and the lower leaf is the opening area; Two smoking components, the two smoking components are respectively a first smoking component and a second smoking component, the first smoking component is arranged on the inner wall of the upper leaf, and the second smoking component is arranged on the inner wall of the lower leaf, and the first smoking component and the second smoking component both include a smoke suction pipe and a suction head; the suction head is located at the front of the support area, and the suction head is detachably installed between the upper leaf and the lower leaf, a cavity is opened in the suction head, and a plurality of suction holes are opened on the suction head, and the suction holes connect the cavity with the external space, one end of the smoke suction pipe passes through the suction head and connects with the cavity, and the smoke suction pipe extends outward and extends out of the support area.

2. A smoke suction speculum according to claim 1, characterized in that: The plurality of suction holes are arranged in an array along the length direction of the suction head, and the sum of the cross-sectional areas of the plurality of suction holes is larger than the cross-sectional area of ​​the inner wall of the smoke suction pipe.

3. A smoke suction speculum according to claim 1, characterized in that: The length direction of the suction head is parallel to the width direction of the lower leaf.

4. A smoke suction speculum according to claim 1, characterized in that: The attraction head is embedded with a magnet, and the upper leaf and the lower leaf are made of magnetically attractive materials; The suction head of one of the smoking components is a first suction head, and the suction head of the other smoking component is a second suction head; The magnet on the first attraction head is magnetically attracted to the inner wall of the upper leaf, and the magnet on the second attraction head is magnetically attracted to the inner wall of the lower leaf.

5. The smoke suction speculum according to claim 1, characterized in that: The smoke suction pipe is a hose.

6. A smoke suction speculum according to claim 5, characterized in that: The first smoking assembly further comprises a through slot, a mounting block and a first through hole; The through slot is opened on the upper leaf, the length direction of the through slot is parallel to the length direction of the upper leaf, the plane where the left side wall of the through slot is located is the first plane, the plane where the right side wall of the through slot is located is the second plane, and there is an acute angle between the first plane and the second plane; The mounting block is inserted into the through slot, and the side wall of the mounting block is in contact with the side wall of the through slot; A first through hole is formed through the mounting block, and an axial direction of the first through hole is parallel to a length direction of the upper leaf; The smoke suction pipe of the first smoking component extends from one end of the first through hole and extends from the other end of the first through hole, and the first through hole extension section of the smoke suction pipe of the first smoking component is connected to the cavity of the suction head of the first smoking component.

7. A smoke suction speculum according to claim 6, characterized in that: The bottom end surface of the installation block is penetrated by a plurality of light-transmitting through grooves, and the light-transmitting through grooves penetrate the bottom end surface of the installation block and are connected to the first through hole.

8. The smoke suction speculum according to claim 5, characterized in that: The lower leaf is L-shaped, and the L-shaped lower leaf includes a horizontal leaf and a vertical leaf; at least one second through hole is opened through the horizontal leaf, and at least one third through hole is opened through the vertical leaf; the smoke suction pipe passes through the second through hole on the horizontal leaf and the third through hole on the vertical leaf in sequence.

9. A smoke suction speculum according to claim 8, characterized in that: The vaginal speculum also includes a connecting bracket; The area between the horizontal leaf and the upper leaf is the open area, and the connecting bracket is slidably mounted on the vertical leaf, and the sliding direction of the connecting bracket is parallel to the length direction of the vertical leaf; The upper leaf is rotatably mounted on the top of the connecting bracket, and the rotation axis of the upper leaf is perpendicular to the length direction of the vertical leaf, and the rotation axis of the upper leaf is also perpendicular to the length direction of the horizontal leaf.

10. The smoke suction speculum according to claim 9, characterized in that: The speculum further comprises a locking assembly for locking the relative sliding between the connecting bracket and the vertical leaf, wherein the locking assembly comprises a sliding sleeve and a screw rod; The sliding sleeve is slidably sleeved outside the connecting bracket and the vertical leaf; The screw rod passes through the sliding sleeve and is connected to the front wall of the bracket to contact the front wall, and the screw rod is threadedly connected to the sliding sleeve.