CN211512003U

CN211512003U - Obstetrical suction cup for obstetrics and gynecology department

Info

Publication number: CN211512003U
Application number: CN201921560562.6U
Authority: CN
Inventors: 王江宁; 杨嘉瑜
Original assignee: Guihang Guiyang Hospital
Current assignee: Guihang Guiyang Hospital
Priority date: 2019-09-19
Filing date: 2019-09-19
Publication date: 2020-09-18
Anticipated expiration: 2029-09-19

Abstract

The utility model relates to a gynaecology and obstetrics is with practise midwifery sucking disc, include: the sucking disc comprises a sucking disc body and a tension indicating part, wherein the sucking disc body comprises a sucking disc head, a sucking disc rod and a negative pressure connecting pipe, the tension indicating part comprises a first connecting plate, a second connecting plate, a tension spring and at least two guide rods, the sucking disc head is connected to one end of the sucking disc rod, one end of the negative pressure connecting pipe is connected to the side wall of the sucking disc rod, the other end of the sucking disc rod is connected to the first connecting plate, one end of the tension spring is connected to the first connecting plate, the other end of the tension spring is connected to the second connecting plate, one end of each guide rod is fixedly connected to the first connecting, in order to guide first connecting plate for second connecting plate parallel translation, be equipped with on at least one guide bar in two piece at least guide bars and be used for instructing tensile scale, the utility model discloses simple structure, and need not to use electronic component to measure the pulling force, the product is reliable, uses and the maintenance cost is low.

Description

Obstetrical suction cup for obstetrics and gynecology department

Technical Field

The utility model relates to the field of medical equipment, especially, relate to a gynaecology and obstetrics is with practise midwifery sucking disc.

Background

In cases where the second stage of labor is too long or the parturient has a particular condition, suction cups are often needed to assist in delivering the neonate. The current sucking disc of gynaecology and obstetrics structure is too simple and the function is single, and the adsorption affinity is little and use inflexible, meets when difficult to produce, and obstetrical department medical staff holds the childbirth sucking disc by hand and seems especially hard. Moreover, different medical staff have different techniques and experiences, so that the medical staff can hurt the fragile limbs of the puerpera or the child when exerting careless force during the delivery and the labor assistance. For example, scar laceration may be caused during the midwifery process, which may cause secondary damage to the patient's body. Brings certain unsafe factors to the lying-in women or the infants and brings great troubles to the medical field. Greatly increasing the working difficulty of the obstetrical medical staff.

Thus, a suction cup device that can observe the pulling force is presented. For example, chinese patent document with publication number CN106491195A discloses a gynaecology and obstetrics is with practise midwifery sucking disc device, including empty section of thick bamboo and sucking disc, be provided with control panel on the front surface of empty section of thick bamboo, be provided with the display on control panel's the front surface, and the top position department that is close to the display on control panel's the front surface is provided with bee calling organ, the below position department that is close to the display on control panel's the front surface is provided with the warning light, the one end position department that is close to the warning light in the below of display is provided with control switch, one side of empty section of thick bamboo is provided with the nipple, the sucking disc is installed in the one end of nipple. The invention has scientific and reasonable structure and safe and convenient use, is provided with the tension sensor, solves the problems that the body of a child is easily damaged because the strength of the child cannot be controlled because the strength of the child is unknown, and solves the problems that the body of the child is easily damaged because the annular piston hand pull handle is arranged, the annular piston hand pull handle is not beneficial to tightly holding the piston hand pull handle, the hand is easily slippery and the newborn is easily damaged unnecessarily. However, this device has a complicated structure, requires a sensor, a display, and the like, has low reliability, and has high use and maintenance costs. Therefore, there is a need for improvements in the prior art.

Furthermore, on the one hand, due to the differences in understanding to the person skilled in the art; on the other hand, since the inventor has studied a lot of documents and patents when making the present invention, but the space is not limited to the details and contents listed in the above, however, the present invention is by no means free of the features of the prior art, but the present invention has been provided with all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model provides a gynaecology and obstetrics is with practising midwifery sucking disc, include: sucking disc body and pulling force instruction portion, the sucking disc body includes the sucking disc head, sucking disc pole and negative pressure connecting pipe, pulling force instruction portion includes first connecting plate, the second connecting plate, extension spring and two piece at least guide bars, wherein, the sucking disc head is connected in the one end of sucking disc pole, the one end of negative pressure connecting pipe is connected in the lateral wall of sucking disc pole, sucking disc head, sucking disc pole and negative pressure connecting pipe communicate each other on the gas circuit, the other end of sucking disc pole is connected in first connecting plate, the one end of extension spring is connected in first connecting plate, the other end of extension spring is connected in the second connecting plate, the one end rigid coupling of guide bar is on first connecting plate and the other end of guide bar passes the slide opening on the second connecting plate to guide first connecting plate for second connecting plate parallel translation, be equipped with on at least one guide bar among two piece.

According to a preferred embodiment, the guide rod is a circular tube, and the aperture of the slide hole is 0.5-1.5 mm larger than the diameter of the guide rod.

According to a preferred embodiment, gynaecology and obstetrics still includes erection support and threaded rod with practise midwifery sucking disc, erection support includes the riser of connecting each other and is used for pressing from both sides the installation on the bed board of obstetric table and press from both sides, be equipped with on the riser with the screw hole of the external screw thread adaptation on the threaded rod, second connecting plate swivelling joint be in the one end of threaded rod, the other end of threaded rod is equipped with laborsaving handle to through the threaded rod adjustment the position of sucking disc head.

According to a preferred embodiment, gynaecology and obstetrics still includes the anti-spin subassembly with practise midwifery sucking disc, the anti-spin subassembly is including preventing swing arm, sliding sleeve and slide bar, the one end welding of preventing the swing arm is in on the second connecting plate, the other end welding of preventing the swing arm is in on the sliding sleeve, the sliding sleeve slides and cup joints on the slide bar, the one end welding of slide bar is in on the riser, the slide bar set up the direction with the direction of setting up of threaded rod is parallel to each other.

According to a preferred embodiment, the other end of the suction cup rod is provided with a first threaded interface, and the suction cup rod is detachably connected to the first connecting plate through the first threaded interface.

According to a preferred embodiment, the other end of the negative pressure connecting pipe is provided with a second threaded interface for connecting a negative pressure device.

According to a preferred embodiment, the installation clamp includes the clamping of C style of calligraphy, hand bolt and splint, hand bolt passes through threaded connection on the clamping, the splint welding is in the tip of hand bolt, the operator can twist hand bolt in order to pass through the clamping with the splint centre gripping bed board is in order to with the erection support is fixed on the obstetric table jointly.

According to a preferred embodiment, the handle comprises a sleeve which is sleeved on the other end of the threaded rod and then fixed by a hexagon socket head cap screw.

According to a preferred embodiment, a midwifery suction cup for obstetrics and gynecology department comprises: sucking disc body, pulling force instruction portion, erection support and threaded rod, this body coupling of sucking disc in pulling force instruction portion, the one end of threaded rod is connected in pulling force instruction portion, the erection support includes the riser of connecting each other and is used for pressing from both sides the installation on the bed board of obstetric table and press from both sides, be equipped with on the riser with the screw hole of external screw thread adaptation on the threaded rod, second connecting plate swivelling joint be in the one end of threaded rod, the other end of threaded rod is equipped with laborsaving handle to through the position of threaded rod adjustment sucking disc head.

According to a preferred embodiment, the obstetric table comprises a table body, a table rod and a negative pressure connecting pipe, wherein the table body comprises a table head, a table rod and a negative pressure connecting pipe, the tensile force indicating part comprises a first connecting plate, a second connecting plate, a tension spring and at least two guide rods, the table head is connected to one end of the table rod, one end of the negative pressure connecting pipe is connected to the side wall of the table rod, the table head, the table rod and the negative pressure connecting pipe are communicated with each other on a gas path, the other end of the table rod is connected to the first connecting plate, one end of the tension spring is connected to the first connecting plate, the other end of the tension spring is connected to the second connecting plate, one end of the guide rod is fixedly connected to the first connecting plate, the other end of the guide rod penetrates through a sliding hole in the second connecting plate to guide the first connecting plate to move parallel relative, The anti-rotation device comprises a sliding sleeve and a sliding rod, wherein one end of the anti-rotation rod is welded on the second connecting plate, the other end of the anti-rotation rod is welded on the sliding sleeve, the sliding sleeve is sleeved on the sliding rod in a sliding mode, one end of the sliding rod is welded on the vertical plate, and the setting direction of the sliding rod is parallel to the setting direction of the threaded rod.

The utility model provides a gynaecology and obstetrics has following advantage with practise midwifery sucking disc at least:

firstly, the utility model has simple structure, no need of using electronic elements to measure the pulling force, reliable product and low use and maintenance cost;

second, the utility model discloses a two piece at least guide bars guide first connecting plate for second connecting plate parallel translation, and set up on one of them at least guide bar and be used for instructing tensile scale, let the guide bar realize that a pole is multi-purpose, and need not to set up special scale again, have further simplified the structure.

Drawings

Fig. 1 is a simplified schematic diagram of a preferred embodiment of the present invention.

List of reference numerals

100: the sucker body 110: the sucker head 120: sucker rod

121: first threaded interface 130: negative pressure connecting pipe 131: second screw interface

200: tension indicating section 210: first connection plate 220: second connecting plate

221: the slide hole 230: tension spring 240: guide rod

241: scale 300: mounting the support 310: vertical plate

311: threaded hole 320: the mounting clip 321: card holder

322: hand-screwing of the bolt 323: the splint 400: threaded rod

500: rotation prevention assembly 510: anti-rotation lever 520: sliding sleeve

530: a slide bar 540: protective ball 600: handle bar

610: the sleeve 620: inner hexagon bolt

Detailed Description

This is explained in detail below with reference to fig. 1.

According to a preferred embodiment, referring to fig. 1, a midwifery suction cup for obstetrics and gynecology department may comprise: the suction cup body 100 and/or the tension indicator 200. The suction cup body 100 may include a suction cup head 110, a suction cup stem 120, and/or a negative pressure connection tube 130. The tension indicating part 200 may include a first link plate 210, a second link plate 220, a tension spring 230, and/or at least two guide bars 240. The suction cup head 110 may be attached to one end of the suction cup rod 120. One end of the negative pressure connection pipe 130 may be connected to a sidewall of the suction cup lever 120. The suction cup head 110, the suction cup rod 120, and the negative pressure connection pipe 130 may be in communication with each other on an air path. The other end of the suction cup bar 120 may be connected to the first connection plate 210. One end of the tension spring 230 may be connected to the first connection plate 210. The other end of the tension spring 230 may be connected to the second connection plate 220. One end of the guide rod 240 may be fixed to the first connection plate 210. Preferably, in the present invention, the fixing may refer to at least one of welding, bonding, screwing, bolting, and riveting. The other end of the guide rod 240 may pass through the slide hole 221 of the second link plate 220 to guide the first link plate 210 to move in parallel with respect to the second link plate 220. At least one guide rod 240 of the at least two guide rods 240 may be provided with a scale 241 for indicating a pulling force. The utility model discloses a following beneficial technological effect can be realized at least to this mode: firstly, the utility model has simple structure, no need of using electronic elements to measure the pulling force, reliable product and low use and maintenance cost; second, the utility model discloses an at least two guide bars guide first connecting plate 210 for second connecting plate 220 parallel translation, and set up on one of them at least guide bar 240 and be used for instructing tensile scale 241, let guide bar 240 realize that a pole is multi-purpose, and need not to set up special scale 241 chi again, have further simplified the structure.

According to a preferred embodiment, the guide rod 240 may be a circular tube. The aperture of the slide hole 221 may be larger than the diameter of the guide rod 240. The diameter of the sliding hole 221 may be 0.5 to 1.5mm larger than the diameter of the guide rod 240. The utility model discloses a following beneficial technological effect can be realized at least to this mode: let guide rod 240 slide relatively to second connecting plate 220 more smoothly, reduce the influence to the pulling force reading for the measuring result of pulling force is more accurate.

According to a preferred embodiment, the obstetric suction cup for obstetrics and gynecology department may comprise a mounting base 300 and/or a threaded rod 400. Mounting bracket 300 may include risers 310 connected to one another and/or mounting clips 320 for clipping onto a bed plate of a obstetric table. The vertical plate 310 may be provided with a threaded hole 311 adapted to the external thread of the threaded rod 400. The second connecting plate 220 may be rotatably connected to one end of the threaded rod 400, and the other end of the threaded rod 400 may be provided with a handle 600 for saving labor. Thereby, the position of the suction cup head 110 is adjusted by the threaded rod 400. The utility model discloses a following beneficial technological effect can be realized at least to this mode: firstly, the obstetric apparatus is pulled outwards by rotating the threaded rod 400, so that the medical staff is more labor-saving; second, when adjusted to the corresponding position, the medical personnel can even release the handle 600 to perform the brief task of taking the tool without worrying about the midwifery suction cup going back, by virtue of the self-locking principle of the threads.

According to a preferred embodiment, the obstetric suction cup for obstetrics and gynecology department may comprise an anti-rotation assembly 500. The anti-rotation assembly 500 can include an anti-rotation bar 510, a sliding sleeve 520, and/or a sliding bar 530. One end of the rotation preventing bar 510 may be welded to the second connection plate 220. The other end of the rotation preventing bar 510 may be welded to the sliding sleeve 520. The sliding sleeve 520 can be slidably sleeved on the sliding rod 530. One end of the sliding bar 530 may be welded to the riser 310. The arrangement direction of the slide bar 530 and the arrangement direction of the threaded rod 400 may be parallel to each other. The utility model discloses a following beneficial technological effect can be realized at least to this mode: when the position of the suction cup is adjusted through the screw thread, the rotation of the suction cup can be prevented by the rotation preventing assembly 500, and the possibility of the slippage of the suction cup can be reduced by only making a linear motion.

According to a preferred embodiment, the free end of the sliding bar 530 may be provided with a protection ball 540 having an arc-shaped surface. The sliding bar 530 may be cylindrical. The protective ball 540 may be spherical. The protective ball 540 may have a diameter larger than that of the slide bar 530. Preferably, the ratio of the diameter of the protective ball 540 to the diameter of the sliding rod 530 is 2 to 4. The utility model discloses a following beneficial technological effect can be realized at least to this mode: the possibility of injury to a person by the sliding bar 530 being cantilevered is reduced.

According to a preferred embodiment, the other end of the suction cup rod 120 may be provided with a first screw interface 121. The suction cup lever 120 may be removably coupled to the first connection plate 210 via a first threaded interface 121.

According to a preferred embodiment, the other end of the negative pressure connection pipe 130 may be provided with a second screw interface 131 for connecting a negative pressure device. Preferably, the negative pressure device is an existing product, and a person skilled in the art can select a suitable negative pressure device according to needs. Preferably, the negative pressure device can generate negative pressure in the range of 10-60 kPa during the negative pressure adsorption process. Particularly preferably 30 to 40 kPa.

According to a preferred embodiment, the mounting clip 320 may include a C-shaped clip 321, a hand-threaded bolt 322, and/or a clamping plate 323. The hand-threaded bolt 322 may be threadably attached to the clip 321. Clamp plate 323 may be welded to the end of hand bolt 322. An operator may twist the hand screw 322 to clamp the bed plate together by the clamp 321 and the clamp plate 323 to secure the mounting bracket 300 to the bed. The utility model discloses a following beneficial technological effect can be realized at least to this mode: the utility model discloses can install on obstetric table conveniently and dismantle from obstetric table to whether medical personnel confirm selectively according to the site conditions uses the utility model discloses.

According to a preferred embodiment, the handle 600 may include a sleeve 610. The sleeve 610 may be fitted over the other end of the threaded rod 400 and fixed by a hexagon socket head cap screw 620.

The utility model discloses a following beneficial technological effect can be realized at least to this mode: so that the handle 600 can be disassembled relative to the threaded rod 400, and in some cases, several groups of handles 600 with different length specifications can be configured before leaving the factory, so that the handles 600 with corresponding lengths can be installed according to the needs of hospitals, and the needs of medical staff with different strength can be met.

According to a preferred embodiment, a midwifery suction cup for obstetrics and gynecology department may include: suction cup body 100, tension indicator 200, mounting bracket 300, and/or threaded rod 400. The suction cup body 100 may be connected to the tension indicating part 200. One end of the threaded rod 400 may be connected to the tension indicating part 200. The mounting bracket 300 may include a vertical plate 310 and a mounting clip 320 for clipping onto a bed plate of a obstetric table, which are connected to each other. The vertical plate 310 may be provided with a threaded hole 311 adapted to the external thread of the threaded rod 400. The second connecting plate 220 may be rotatably connected to one end of the threaded rod 400. The other end of the threaded rod 400 may be provided with a handle 600 to adjust the position of the suction head 110 through the threaded rod 400. Generally speaking, this approach solves the inconvenience of requiring the medical personnel to continuously pull the suction cup with force. The utility model discloses a following beneficial technological effect can be realized at least to this mode: firstly, the obstetric apparatus is pulled outwards by rotating the threaded rod 400, so that the medical staff is more labor-saving; second, when adjusted to the corresponding position, the medical personnel can even release the handle 600 to perform the brief task of taking the tool without worrying about the midwifery suction cup going back, by virtue of the self-locking principle of the threads.

According to a preferred embodiment, a midwifery suction cup for obstetrics and gynecology department can comprise a suction cup body 100, a tension indicator 200 and/or a rotation prevention assembly 500. The suction cup body 100 will include a suction cup head 110, a suction cup stem 120, and a negative pressure connection tube 130. The tension indicating part 200 will include a first link plate 210, a second link plate 220, a tension spring 230, and at least two guide rods 240. The suction cup head 110 may be attached to one end of the suction cup rod 120. One end of the negative pressure connection pipe 130 may be connected to a sidewall of the suction cup lever 120. The suction cup head 110, the suction cup rod 120, and the negative pressure connection pipe 130 may be in communication with each other on an air path. The other end of the suction cup bar 120 may be connected to the first connection plate 210. One end of the tension spring 230 may be connected to the first connection plate 210. The other end of the tension spring 230 may be connected to the second connection plate 220. One end of the guide rod 240 may be fixed to the first link plate 210 and the other end of the guide rod 240 passes through the slide hole 221 of the second link plate 220 to guide the first link plate 210 to move in parallel with respect to the second link plate 220. The anti-rotation assembly 500 may include an anti-rotation lever 510, a sliding sleeve 520, and a sliding bar 530. One end of the rotation preventing lever 510 may be fixedly coupled to the second coupling plate 220. The other end of the rotation preventing bar 510 may be fixedly coupled to the sliding sleeve 520. The sliding sleeve 520 can be slidably sleeved on the sliding rod 530. One end of the sliding rod 530 may be fixed to the vertical plate 310. The arrangement direction of the slide bar 530 and the arrangement direction of the threaded rod 400 may be parallel to each other. The utility model discloses a following beneficial technological effect can be realized at least to this mode: when the position of the suction cup is adjusted through the screw thread, the rotation of the suction cup can be prevented by the rotation preventing assembly 500, and the possibility of the slippage of the suction cup can be reduced by only making a linear motion.

It should be noted that the above-mentioned embodiments are exemplary, and those skilled in the art can devise various solutions in light of the present disclosure, which are also within the scope of the present disclosure and fall within the scope of the present disclosure. It should be understood by those skilled in the art that the present specification and drawings are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.

Claims

1. The utility model provides a gynaecology and obstetrics is with practising midwifery sucking disc which characterized in that includes: the sucking disc comprises a sucking disc body (100) and a tension indicating part (200), wherein the sucking disc body (100) comprises a sucking disc head (110), a sucking disc rod (120) and a negative pressure connecting pipe (130), the tension indicating part (200) comprises a first connecting plate (210), a second connecting plate (220), a tension spring (230) and at least two guide rods (240),

wherein the sucker head (110) is connected with one end of the sucker rod (120), one end of the negative pressure connecting pipe (130) is connected with the side wall of the sucker rod (120), the sucker head (110), the sucker rod (120) and the negative pressure connecting pipe (130) are communicated with each other on the air path, the other end of the sucker rod (120) is connected with the first connecting plate (210), one end of the tension spring (230) is connected with the first connecting plate (210), the other end of the tension spring (230) is connected with the second connecting plate (220), one end of the guide rod (240) is fixedly connected to the first connecting plate (210) and the other end of the guide rod (240) passes through the sliding hole (221) on the second connecting plate (220), to guide the first connecting plate (210) to move in parallel with respect to the second connecting plate (220), at least one guide rod (240) of the at least two guide rods (240) is provided with a scale (241) for indicating the pulling force.

2. The obstetric suction cup for obstetrics and gynecology department according to claim 1, wherein the guide rod (240) is a circular tube, and the aperture of the slide hole (221) is 0.5 to 1.5mm larger than the diameter of the guide rod (240).

3. The obstetric suction cup for obstetrics and gynecology department of claim 1 or 2, characterized in that, the obstetric suction cup for obstetrics and gynecology department further comprises a mounting support (300) and a threaded rod (400), the mounting support (300) comprises a vertical plate (310) connected with each other and a mounting clamp (320) used for clamping on a bed plate of an obstetric table, a threaded hole (311) matched with an external thread on the threaded rod (400) is arranged on the vertical plate (310), the second connecting plate (220) is rotatably connected at one end of the threaded rod (400), and the other end of the threaded rod (400) is provided with a labor-saving handle (600) so as to adjust the position of the suction cup head (110) through the threaded rod (400).

4. The obstetric suction cup for obstetrics and gynecology department of claim 3, characterized in that, the obstetric suction cup for obstetrics and gynecology department further comprises a rotation preventing component (500), the rotation preventing component (500) comprises a rotation preventing rod (510), a sliding sleeve (520) and a sliding rod (530), one end of the rotation preventing rod (510) is welded on the second connecting plate (220), the other end of the rotation preventing rod (510) is welded on the sliding sleeve (520), the sliding sleeve (520) is slidably sleeved on the sliding rod (530), one end of the sliding rod (530) is welded on the vertical plate (310), and the arrangement direction of the sliding rod (530) and the arrangement direction of the threaded rod (400) are parallel to each other.

5. The obstetric table according to claim 1 or 2, characterized in that the other end of the table rod (120) is provided with a first screw interface (121), and the table rod (120) is detachably connected to the first connection plate (210) through the first screw interface (121).

6. The obstetric table of claim 1 or 2, characterized in that the other end of the negative pressure connection tube (130) is provided with a second screw interface (131) for connecting a negative pressure device.

7. The obstetric suction cup for obstetrics and gynecology department of claim 3, characterized in that, the installation clamp (320) includes the clamping (321), the hand-screwed bolt (322) and the splint (323) of C style of calligraphy, hand-screwed bolt (322) through threaded connection in on the clamping (321), splint (323) welding in the tip of hand-screwed bolt (322), the operator can twist hand-screwed bolt (322) in order to pass through clamping (321) and splint (323) centre gripping bed board jointly in order to fix erection support (300) on the obstetric table.

8. The obstetric suction cup for obstetrics and gynecology department of claim 7, characterized in that the handle (600) comprises a sleeve (610), and the sleeve (610) is sleeved on the other end of the threaded rod (400) and fixed by a hexagon socket head cap screw (620).

9. The utility model provides a gynaecology and obstetrics is with practising midwifery sucking disc which characterized in that includes: sucking disc body (100), pulling force instruction portion (200), erection support (300) and threaded rod (400), sucking disc body (100) connect in pulling force instruction portion (200), the one end of threaded rod (400) is connected in pulling force instruction portion (200), erection support (300) include riser (310) of connecting each other and be used for pressing from both sides installation clamp (320) on the bed board of obstetric table, be equipped with on riser (310) with screw hole (311) of the external screw thread adaptation on threaded rod (400), second connecting plate (220) swivelling joint be in the one end of threaded rod (400), the other end of threaded rod (400) is equipped with laborsaving handle (600) to the position of sucking disc head (110) is adjusted through threaded rod (400).

10. A midwifery sucking disc for obstetrics and gynecology department is characterized in that a sucking disc body (100), a tension indicating part (200) and a rotation-preventing component (500), wherein the sucking disc body (100) comprises a sucking disc head (110), a sucking disc rod (120) and a negative pressure connecting pipe (130), the tension indicating part (200) comprises a first connecting plate (210), a second connecting plate (220), a tension spring (230) and at least two guide rods (240),

wherein, the sucker head (110) is connected with one end of the sucker rod (120), one end of the negative pressure connecting pipe (130) is connected with the side wall of the sucker rod (120), the sucker head (110), the sucker rod (120) and the negative pressure connecting pipe (130) are communicated with each other on the gas path, the other end of the sucker rod (120) is connected with the first connecting plate (210), one end of the tension spring (230) is connected with the first connecting plate (210), the other end of the tension spring (230) is connected with the second connecting plate (220), one end of the guide rod (240) is fixedly connected on the first connecting plate (210) and the other end of the guide rod (240) passes through the sliding hole (221) on the second connecting plate (220) so as to guide the first connecting plate (210) to move in parallel relative to the second connecting,

prevent revolve subassembly (500) including preventing swing arm (510), sliding sleeve (520) and slide bar (530), the one end welding of preventing swing arm (510) is in on second connecting plate (220), the other end welding of preventing swing arm (510) is in on sliding sleeve (520), sliding sleeve (520) slip cup joint on slide bar (530), the one end welding of slide bar (530) is on riser (310), the direction that sets up of slide bar (530) is parallel to each other with the direction that sets up of threaded rod (400).