CN214761293U

CN214761293U - Neonate umbilical cord clamp shears

Info

Publication number: CN214761293U
Application number: CN202121096326.0U
Authority: CN
Inventors: 王陆威; 毕敬业; 王晓娟
Original assignee: Weihai Weigao Jiesheng Medical Equipment Co ltd
Current assignee: Weihai Weigao Jiesheng Medical Equipment Co ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2021-11-19
Anticipated expiration: 2031-05-21

Abstract

The utility model belongs to the field of medical equipment, a neonate umbilical cord clamp is cut ware includes two articulated pincers bodies of each other, keeps silent, handle, is located two V-arrangement umbilical cord clamp and shearing piece between the pincers bodies, V-arrangement umbilical cord clamp include two arm lock and splice bar, and the bottom of splice bar is equipped with vertical bellied protruding stupefied, is equipped with the elastic strip on the handle, and the front end and the rear end of two arm lock are equipped with preceding kelly, back jack-post respectively, correspond with it position on keeping silent is provided with preceding jack-post groove and back jack-post groove respectively, back jack-post tank bottom is equipped with the stopper for when the umbilical cord is cut to the clamp, the shearing piece cuts the umbilical cord after V-arrangement umbilical cord clamp presss from both sides tight and locking mechanism closure, and the stopper blocks V-arrangement umbilical cord clamp descending distance in operation process, and the easy dislocation when preventing the V-arrangement cord clamp that the umbilical cord was cut from using causes the closure failure.

Description

Neonate umbilical cord clamp shears

Technical Field

The utility model relates to the field of medical equipment, especially, relate to a neonate umbilical cord clamp cuts ware.

Background

In order to quickly ligate and cut off the umbilical cord of a newborn in the delivery process, the chinese patent application CN1689532A provides a disposable umbilical cord scissors as shown in fig. 1, the front end of the scissors is a scissors seat 01, the rear end is a handle 02, the inner sides of the two scissors seats 01 are fixedly provided with a notch clamping seat 03, two ends of the notch clamping seat 03 are provided with protrusions, a scissors blade 04 and a notch clamping strip 05 are arranged on the notch clamping seat on one side through the protrusions, the cutting edge is positioned at the notch, the notch clamping seat on the other side is provided with a scissors strip, and the scissors strip and the scissors blade are in a scissors shape; elastic pliers 06 (not shown in another figure) are respectively arranged at two outer sides of the two concave clamping seats, and the elastic pliers 06 are positioned on the scissors seat by placing the clamping columns at two ends of two arms into the clamping column grooves at two ends of the scissors seat to be movably combined with the scissors seat. During shearing, the elastic pincers are closed to tightly clamp the object to be sheared and fall off from the scissors to be left on the object to be sheared. When the elastic pliers 06 fall off the scissors, the elastic pliers 06 must be bounced by the arc-shaped elastic strip 07 positioned at the inner side of the handle 2 during cutting. Although the umbilical cord scissors simplify the umbilical cord ligation operation of the newborn, shorten the operation time and avoid the possibility of cross infection, after the umbilical cord scissors are cut, if the arc-shaped elastic strips cannot bounce the elastic forceps, the elastic forceps cannot be separated from the scissors seat, the structure is complex, the production cost is high, and the problem that the locking fails due to easy dislocation of the elastic forceps during use easily occurs.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a simple structure, easy operation, can solve the easy dislocation when elasticity pincers use and cause the problem of failure when the closure, and can increase the neonate umbilical cord clamp that the blade really is used for cuting the length of umbilical cord is cut the ware.

The technical scheme of the utility model is that: a neonate umbilical cord clamp shearing device comprises two clamp bodies hinged through a hinge shaft, wherein a jaw is arranged at the upper half part of each clamp body, a handle is arranged at the lower half part of each clamp body, a V-shaped umbilical cord clamp is arranged between the two clamp bodies, each V-shaped umbilical cord clamp comprises two clamp arms and a connecting rib which is arranged at the rear end of the V-shaped umbilical cord clamp and used for connecting the two clamp arms, longitudinally protruding convex ridges are arranged at the bottoms of the connecting ribs, when the umbilical cord is clamped by the two clamp arms during shearing, locking mechanisms which are mutually locked are arranged on the inner side surfaces of the front ends of the two clamp arms, front clamping columns are arranged at the front ends of the two clamp arms, rear clamping columns are arranged at the rear ends of the two clamp arms, front clamping column grooves and rear clamping column grooves are respectively arranged at corresponding positions of the front ends and the rear ends of the jaw, blocking columns are arranged at positions, which are close to the front clamping columns, semi-annular connecting rib accommodating grooves are arranged at the hinge parts of the clamp bodies, before shearing, the connecting ribs are positioned in the connecting rib accommodating grooves, gaps are formed at the bottoms of the connecting rib accommodating grooves, arc-shaped elastic strips are fixedly arranged on the inner sides of the handles of the pliers bodies, and the front ends of the elastic strips enter the connecting rib accommodating grooves from the gaps at the bottoms of the connecting rib accommodating grooves;

the clamp comprises a clamp body, a jaw and a handle, wherein the jaw is internally provided with two V-shaped umbilical cord clamps which are matched with the inner side of the clamp body and a shearing piece between the two V-shaped umbilical cord clamps, the shearing piece is used for clamping the V-shaped umbilical cord clamps firstly when the handle clamps towards the middle by force and then the two shearing pieces contact with each other, the shearing piece cuts off the umbilical cord, and the shearing piece is formed by matching a blade with a cutting board or matching the blade with a chopping board;

and the bottom of the rear clamping column groove is provided with a limiting block for limiting the rear clamping column of the V-shaped umbilical cord clamp.

The bottom of the rear clamping column is abutted against the upper end of the limiting block, the transverse length of the rear end of the shearing part is unchanged, the transverse length of the front end of the shearing part is lengthened, and the transverse length of the shearing part is gradually reduced along with approaching of the rear end of the shearing part.

The cutting piece is matched with a cutting board through a blade, the transverse length of the rear end of the blade is unchanged, the transverse length of the front end of the blade is lengthened, and the transverse length of the blade is gradually shortened along with the fact that the cutting piece is close to the rear end of the blade.

The cutting board is characterized in that the blade is in an inverted right trapezoid shape from the front end to the rear end, the upper part and the lower part of one side, close to the cutting board, of the blade are right angles, and the side, close to the pliers body, of the blade is obliquely arranged in a mode that the acute angle at the front end and the obtuse angle at the rear end are formed.

The included angle between the inclined side of the rear end of the blade extending towards the front end and the right-angle side of the blade is more than 0 degree and less than 4 degrees

The inner side of one of the pliers bodies is provided with a first groove for arranging and fixing the blade, the other side of the blade, which is not dropped by the blade, is provided with a blade fixing piece corresponding to the blade groove, the cutting edge of the blade is positioned at the groove, the inner side of the other pliers body is provided with a second groove corresponding to the first groove for arranging and fixing the chopping board, and when an umbilical cord is cut, the action force of the blade acts on the longitudinal central line of the chopping board at the position opposite to the blade.

The strength of the clamping arms is guaranteed, the clamping arms cannot be easily deformed when clamped, and reinforcing ribs are arranged on the outer sides of the two clamping arms.

The handle of the other clamp body corresponding to the convex part of the elastic strip is provided with a stop block, when the handle is closed, the elastic strip is abutted against the stop block, the stop block has a limiting effect on the elastic strip to change the motion track of the elastic strip, and the elastic strip moves towards the direction of the V-shaped umbilical cord clamp after being blocked by force.

The butt joint surfaces of the two clamping arms are provided with tooth-shaped structures which are mutually butted, and the centers of the inner sides of the two clamping arms are respectively provided with a rectangular groove.

The inner side surfaces of the front ends of the two clamping arms are provided with locking mechanisms which are locked with each other, the inner side surface of the front end of one clamping arm is provided with a ratchet hook, the inner side surface of the front end of the other clamping arm is provided with a ratchet hook groove, when the two clamping arms are separated, the ratchet hook is positioned outside the ratchet hook groove, and when the two clamping arms are clamped, the ratchet hook is positioned in the ratchet hook groove, so that the two clamping arms are tightly clamped and are not separated.

The utility model has the advantages and positive effects that: due to the adoption of the technical scheme, the limiting block is arranged at the bottom of the rear clamping column groove and blocks the descending path of the V-shaped umbilical cord clamp, so that the problem that the V-shaped umbilical cord clamp used for shearing the umbilical cord is prone to dislocation when used and causes failure in locking can be solved, in the prior art, the rear end of the shearing piece is a small half when the shearing piece works, the stress range value is about 1-1.5 cm at the rear end of the shearing piece, in other words, when the umbilical cord is sheared, the umbilical cord needs to be deeply inserted into the top end of a V point of the V-shaped umbilical cord clamp, and the shearing effect can be ensured. The utility model discloses improve the back and pass through the design the reasonable inclination of shearing piece increases the blade really is used for cuting the length of navel cord.

Drawings

FIG. 1 is a schematic diagram of a prior art umbilical cord scissors;

FIG. 2 is an exploded view of an umbilical cord scissors according to an embodiment of the present invention;

fig. 3 is a schematic view of the forceps body of the umbilical cord scissors according to the embodiment of the present invention.

In the figure:

1. the multifunctional cutting pliers comprise a pliers body, 2 jaws, 3 handles, 4V-shaped umbilical cord clamps, 5 cutting pieces, 51 blades, 52 cutting boards, 6 first grooves, 7 blade fixing pieces, 8 second grooves, 41 clamping arms, 42 connecting ribs, 43 reinforcing ribs, 44 protruding ribs, 45 ratchet hooks, 46 ratchet hook grooves, 47 front clamping columns, 48 rear clamping columns, 49 retaining columns, 9 front clamping column grooves, 10 rear clamping column grooves, 11 connecting rib accommodating grooves, 12 notches, 13 elastic strips, 14 first planes, 15 second planes, 16 bosses, 17 inclined planes and 18 limiting blocks.

Detailed Description

As shown in fig. 2-3, the utility model relates to a neonate umbilical cord clamp scissors, which comprises two clamp bodies 1 hinged by a hinge shaft, wherein the upper half part of the clamp body 1 is provided with a clamp mouth 2, the lower half part of the clamp body 1 is provided with a handle 3, two V-shaped umbilical cord clamps 4 adapted to the inner side of the clamp body 1 and two shearing pieces 5 between the V-shaped umbilical cord clamps 4 are arranged in the clamp mouth 2, the shearing pieces 5 are used for clamping the handle 3 towards the middle with force, the V-shaped umbilical cord clamps 4 clamp firstly, then the shearing pieces 5 cut the umbilical cord, the safety of shearing the neonatal umbilical cord is ensured, bleeding is prevented, the shearing pieces 5 in the prior art are all a small half part of the rear end of the shearing pieces 5, the stress range value is about 1 cm to 1.5 cm at the rear end of the shearing pieces 5, in other words, the umbilical cord needs to be inserted into the top end of the V-shaped umbilical cord clamp 4V point, the shearing effect can be ensured. The utility model discloses after improving shearing part 5 is blade and blade cooperation, perhaps blade 51 and chopping block 52 cooperation, the demonstration in the picture is blade 51 and chopping block 52 cooperation, the utility model discloses do after improving blade 51 rear end transverse length is unchangeable, the transverse length of blade 51 front end is elongated, along with being close to blade 51 rear end blade 51 transverse length diminishes gradually, and is preferred as shown in FIG. 2, blade 51 is from the front end to the rear end for invering right trapezoid, and is preferred blade 51 is close to be the right angle about one side of chopping block 52, blade 51 is close to obtuse angle's slope setting below the acute angle of going up is one side of pincers body 1. Preferably, the included angle between the inclined side of the extending direction of the rear end of the blade 51 and the right-angle side of the blade 51 is greater than 0 degree and smaller than 4 degrees, and when the rear end of the blade 51 is sheared with the rear end of the anvil plate 52 by an experimental existing product, the jaw 2 forms an included angle of 5.6 degrees, along with shearing, part of the cutting edge of the blade 51 can cut into the anvil plate 52, and the reasonable inclination angle of the shearing part 5 can increase the length of the blade 51 which is actually used for shearing the umbilical cord.

A first groove 6 is formed in one of the forceps bodies 1 for receiving and fixing the blade 51, a blade fixing piece 7 corresponding to the groove of the blade 51 is formed on the other side of the blade 51 so as to prevent the blade 51 from falling off, the cutting edge of the blade 51 is located at the groove, a second groove 8 corresponding to the first groove 6 is formed in the other forceps body 1 for receiving and fixing the other blade 51 or the anvil plate 52, the matching structure of the blade 51 and the anvil plate 52 is shown in the figure, when an umbilical cord is cut, the blade 51 acts on the longitudinal center line of the anvil plate 52 opposite to the blade 51, and preferably, the first groove 6 is an inverted right-angled trapezoid matched with a part of the blade 51 placed in the first groove 6.

Or the anvil 52 may be modified, and those skilled in the art will readily appreciate that the anvil 52 may also be designed as an inverted right-angled trapezoid, with the lateral length of the front end of the anvil 52 being longer and the length of the rear end of the anvil 52 being unchanged.

The V-shaped umbilical cord clamp 4 comprises two clamping arms 41 and a connecting rib 42 at the rear end of the V-shaped umbilical cord clamp 4 for connecting the two clamping arms 41, in order to ensure the strength of the clamping arms 41 and prevent easy deformation during clamping, a reinforcing rib 43 is arranged at the outer side of the two clamping arms 41, a longitudinally protruding convex ridge 44 is arranged at the bottom of the connecting rib 42, when the two clamping arms 41 clamp the umbilical cord during shearing, a locking mechanism for mutual locking is arranged at the inner side surface of the front end of the two clamping arms 41, a ratchet 45 is arranged at the inner side surface of the front end of one of the clamping arms 41, a ratchet groove 46 is arranged at the inner side surface of the front end of the other clamping arm 41, when the two clamping arms 41 are separated, the ratchet 45 is positioned outside the ratchet groove 46, and when the two clamping arms 41 are clamped, the ratchet 45 is positioned inside the ratchet groove 46, so that the two clamping arms 41 tightly clamp the umbilical cord, The clamp comprises two clamp arms 41, wherein the butt joint surfaces of the two clamp arms 41 are provided with tooth-shaped structures which are mutually involutory, the centers of the inner sides of the two clamp arms 41 are respectively provided with a rectangular groove, the front ends of the two clamp arms 41 are provided with front clamping columns 47, the rear ends of the two clamp arms are provided with rear clamping columns 48, the front ends and the rear ends of the clamp jaws 2 are respectively provided with front clamping column grooves 9 and rear clamping column grooves 10, the outer sides of the two clamp arms 41 are provided with baffle columns 49 near the front clamping columns 47, the joint of the clamp body 1 is provided with a semi-annular connecting rib accommodating groove 11, before cutting, the connecting rib 42 is positioned in the connecting rib accommodating groove 11, the bottom of the connecting rib accommodating groove 11 is provided with a notch 12, the inner side of a handle 3 of the clamp body 1 is fixedly provided with an arc-shaped elastic strip 13, the front end of the elastic strip 13 enters the connecting rib accommodating groove 11 from the notch 12 at the bottom of the connecting rib accommodating groove 11, when in use, the convex edge 44 has a limiting effect on the front end of the elastic strip 13, a stop block is arranged on the handle 3 of the other forceps body 1 corresponding to the convex part of the elastic strip 13 or a concave part is arranged on the inner side of the handle 3, said stop, when closing said handle 3, said elastic strip 13 abuts against said stop or said recess, both when using shearing, the limiting function on the elastic strip 13 changes the motion track of the elastic strip 13, so that the elastic strip 13 moves towards the direction of the V-shaped umbilical cord clamp 4, in the embodiment, as shown in figure 2, the block is arranged, the moving position of the elastic strip 13 is limited by the block during shearing, so that the elastic strip moves towards the front end, namely, when the V-shaped umbilical cord clamp 4 moves towards the direction, the elastic strip 13 pushes the V-shaped umbilical cord clamp 4 out of the clamp body 1 when the umbilical cord is cut off.

As shown in fig. 2, the bottom of the rear clamping column groove 10 is provided with a limiting block 18 for limiting the rear clamping column 48 of the V-shaped umbilical cord clamp 4, the rear clamping groove in the prior art is a through groove which penetrates through the V-shaped umbilical cord clamp from top to bottom, so that the problem that the V-shaped umbilical cord clamp used for cutting the umbilical cord in the prior art is prone to dislocation when in use and fails in locking is solved, and the limiting block 18 is added below the V-shaped umbilical cord clamp 4 to block the descending path of the V-shaped umbilical cord clamp 4. The limiting block 18 is fixedly connected with the rear clamping column groove 10, the upper end of the limiting block 18 is connected with the bottom of the rear clamping column groove 10, and the bottom of the rear clamping column 48 of the V-shaped umbilical cord clamp 4 is abutted against the upper end of the limiting block 18 before use.

The contact surface of the protruding part of the stopper and the elastic strip 13 is a first plane 14, the elastic strip 13 is limited to stop moving continuously towards the other side handle 3 after reaching the stopper, the contact surface of the side edge of the protruding part of the elastic strip 13 is a second plane 15, the second plane 15 is perpendicular to the first plane 14, the elastic strip 13 is limited to prevent the elastic strip 13 from deviating continuously from the handle 3 when reaching the stopper under the action of force, the acting force of the elastic strip 13 is ensured to be perpendicular to the first plane 14, the first plane 14 is provided with a boss 16, the contact surface of the boss 16 and the elastic strip 13 is a plane or an arc surface with a gentle slope, the elastic strip 13 is enabled to abut against the boss 16 under the action of force and continuously and smoothly move towards the V-shaped umbilical cord clamp 4 along the contact surface of the boss 16 under the action of force during shearing, the contact surface of the boss 16 and the protruding part of the elastic strip 13 is selected as a plane, the rear end of the boss 16 is provided with an inclined surface 17 which is contacted with the convex part of the elastic strip 13 and has the same inclined direction with the rear end of the elastic strip 13, the height of the inclined surface 17 is higher than the plane of the boss 16, the inclined surface 17 and the second plane 15 act together to limit the elastic strip 13, so that the elastic strip 13 is extruded and deformed rapidly and reliably when the handle 3 is cut and closed, the elastic strip 13 pushes the V-shaped umbilical cord clamp 4 forwards, and the umbilical cord is cut and the V-shaped umbilical cord clamp 4 can be separated from the jaw 2.

In order to save labor during shearing, the ratio of the distance between the hinge shaft and the free end of the handle 3 to the distance between the hinge shaft and the free end of the forceps body 1 is 1.8-2.2, and the reasonable torque and force arm proportion can save more labor while the same force is applied to the handle 3.

The handle is provided with anti-skid grains or is sleeved with a protective sliding sleeve easily thought by the person skilled in the art.

The clamp body 1, the V-shaped umbilical cord clamp 4, the blade fixing piece 7 and the cutting board 52 are injection molded parts.

The working process of the example is as follows: the utility model discloses when treating user state, two the pincers body 1 and two V-arrangement umbilical cord clamp 4 is in the state of opening, and when needs were cuted, the umbilical cord was put blade 51 with optional position between chopping block 52 holds handle 3, the action of power in succession, the utility model discloses a structure is guaranteed V-arrangement umbilical cord clamp 4 receives the pressure deformation, two when arm 41 presss from both sides tightly, ratchet 45 is located two within the ratchet groove 46 the closure of arm 41 makes two arm 41 closely presss from both sides tightly, does not separate, accomplishes the clamp of umbilical cord and presss from both sides tightly, pincers body 1 continues to fold, blade 51 contact when the umbilical cord is cut when chopping block 52 the elastic strip 13 contact the dog, the umbilical cord just by blade 51 with blade 51 corresponds the chopping block 52 is cut, when cutting, because elastic strip 13 receives boss 16, The inclined surface 17 and the second plane 15 act together to limit the elastic strip 13, so that the elastic strip 13 is extruded and deformed quickly and reliably when the handle 3 is cut and the handle is closed, the elastic strip 13 pushes the V-shaped umbilical cord clamp 4 forwards, and the umbilical cord is cut off and the V-shaped umbilical cord clamp 4 can be separated from the jaw 2.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. The utility model provides a neonate umbilical cord clamp cuts ware, includes two pincers bodies through articulated shaft articulated, pincers body upper half is equipped with keeps silent, pincers body lower half is the handle, is located two V-arrangement umbilical cord clamp between the pincers body which characterized in that: the V-shaped umbilical cord clamp comprises two clamping arms and a connecting rib which is arranged at the rear end of the V-shaped umbilical cord clamp and is used for connecting the two clamping arms, the bottom of the connecting rib is provided with a convex ridge which is longitudinally protruded, when in shearing, the two clamping arms clamp the umbilical cord, the inner side surfaces of the front ends of the two clamping arms are provided with locking mechanisms which are mutually locked, the front ends of the two clamping arms are provided with front clamping columns, the rear ends of the two clamping arms are provided with rear clamping columns, the front end and the rear end of the jaw are respectively provided with a front clamping column groove and a rear clamping column groove, a stop column is arranged at the outer side of the two clamping arms close to the front clamping column, a semi-annular connecting rib accommodating groove is arranged at the joint of the clamp bodies, before the cutting, the connecting ribs are positioned in the connecting rib accommodating grooves, the bottoms of the connecting rib accommodating grooves are provided with notches, an arc-shaped elastic strip is fixedly arranged on the inner side of the forceps body handle, and the front end of the elastic strip enters the connecting rib accommodating groove from the notch at the bottom of the connecting rib accommodating groove;

2. The neonatal umbilical cord clamp as claimed in claim 1, wherein: the bottom of the rear clamping column is abutted against the upper end of the limiting block, the transverse length of the rear end of the shearing part is unchanged, the transverse length of the front end of the shearing part is lengthened, and the transverse length of the shearing part is gradually reduced along with approaching of the rear end of the shearing part.

3. The neonatal umbilical cord clamp as claimed in claim 2, wherein the cutting member is a blade and an anvil cooperating with each other, the transverse length of the rear end of the blade being constant, the transverse length of the front end of the blade being longer, and the transverse length of the blade being gradually smaller as it approaches the rear end of the blade.

4. The neonatal umbilical cord clamp as claimed in claim 3, wherein: the cutting board is characterized in that the blade is in an inverted right trapezoid shape from the front end to the rear end, the upper part and the lower part of one side, close to the cutting board, of the blade are right angles, and the side, close to the pliers body, of the blade is obliquely arranged in a mode that the acute angle at the front end and the obtuse angle at the rear end are formed.

5. The neonatal umbilical cord clamp as claimed in claim 4, wherein: the included angle between the inclined side of the rear end of the blade extending to the front end and the right-angle edge of the blade is larger than 0 degree and smaller than 4 degrees.

6. The neonatal umbilical cord clamp as claimed in claim 4 or 5, wherein: the inner side of one of the pliers bodies is provided with a first groove for arranging and fixing the blade, the other side of the blade, which is not dropped by the blade, is provided with a blade fixing piece corresponding to the blade groove, the cutting edge of the blade is positioned at the groove, the inner side of the other pliers body is provided with a second groove corresponding to the first groove for arranging and fixing the chopping board, and when an umbilical cord is cut, the action force of the blade acts on the longitudinal central line of the chopping board at the position opposite to the blade.

7. The neonatal umbilical cord clamp as claimed in claim 6, wherein: the strength of the clamping arms is guaranteed, the clamping arms cannot be easily deformed when clamped, and reinforcing ribs are arranged on the outer sides of the two clamping arms.

8. The neonatal umbilical cord clamp as claimed in claim 7, wherein: the handle of the other clamp body corresponding to the convex part of the elastic strip is provided with a stop block, when the handle is closed, the elastic strip is abutted against the stop block, the stop block has a limiting effect on the elastic strip to change the motion track of the elastic strip, and the elastic strip moves towards the direction of the V-shaped umbilical cord clamp after being blocked by force.

9. The neonatal umbilical cord clamp as claimed in claim 8, wherein: the butt joint surfaces of the two clamping arms are provided with tooth-shaped structures which are mutually butted, and the centers of the inner sides of the two clamping arms are respectively provided with a rectangular groove.

10. The neonatal umbilical cord clamp as claimed in claim 9, wherein: the inner side surfaces of the front ends of the two clamping arms are provided with locking mechanisms which are locked with each other, the inner side surface of the front end of one clamping arm is provided with a ratchet hook, the inner side surface of the front end of the other clamping arm is provided with a ratchet hook groove, when the two clamping arms are separated, the ratchet hook is positioned outside the ratchet hook groove, and when the two clamping arms are clamped, the ratchet hook is positioned in the ratchet hook groove, so that the two clamping arms are tightly clamped and are not separated.