CN213326772U

CN213326772U - Water purifier with clamping claw capable of being locked in swinging mode

Info

Publication number: CN213326772U
Application number: CN202021220080.9U
Authority: CN
Inventors: 朱泽春; 谷晓峰; 马明阳
Original assignee: Joyoung Co Ltd
Current assignee: Shandong Jiuchuang Home Appliance Co ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2021-06-01
Anticipated expiration: 2030-06-28

Abstract

The utility model provides a purifier of jack catch swing locking, includes support and aircraft nose, the aircraft nose is installed on the support, still includes guide and jack catch, guide swing joint in the aircraft nose below, the guide is equipped with the mounting hole, the one end fixed connection of jack catch in the aircraft nose bottom surface, the other end of jack catch passes the mounting hole, the aircraft nose with one of them of support is equipped with first pivot, another of them be equipped with the first shaft hole of first pivot cooperation installation, the aircraft nose drives the jack catch winds first pivot swing is with the drive the guide has and tightens up the first swing position of jack catch and unclamp the second swing position of jack catch. The utility model aims to solve the technical problem that overcome prior art not enough and provide a purifier of gripper swing locking, only need inside and outside rotatory filter core realize the dismouting of filter core promptly, need not other extra operations, it is more convenient more to slide.

Description

Water purifier with clamping claw capable of being locked in swinging mode

Technical Field

The utility model relates to a water treatment facilities technical field especially relates to a purifier of gripper swing locking.

Background

As the problem of water resource pollution is increasingly serious, the problem of urban water safety is increasingly prominent, and the water purifier is widely applied to improve the water quality. The water purifier is a water treatment device for filtering impurities such as solid particles, floaters, microorganisms, residual chlorine and the like in water, and can effectively improve the purity of the filtered water. The existing water purifier generally comprises a bracket, a filter element, a water circuit board, a shell and other components, and the filter element is usually detachably mounted on the bracket in order to replace the filter element. When the filter element is installed on the support by adopting a thread matching structure, the filter bottle cap needs to be screwed off by a spanner when the filter element is replaced, the replacement is troublesome, the filter bottle cap is easy to leak water, and certain requirements are met on screwing-in size. The rotary clamping structure is suitable for small-sized filter cores, and when the size of the filter core is large, a user is difficult to lift and rotate the filter core during replacement. The hoop type structure is also suitable for small-sized filter cores, the bursting pressure of the large-sized filter cores is large, and the situation that the hoop is bounced off or broken is easily caused. The structure of the rotatory locking of motor drive joint spare or unblock filter core is comparatively convenient, but the cost of this kind of structure is higher, and when the weight of filter core was great, the elasticity of spring was not enough to drive the filter core smoothly when the unblock and break away from the support. Therefore, how to improve the structure of the bracket and the matching structure between the filter element and the bracket to facilitate the disassembly and assembly of the filter element is one of the problems to be solved urgently in the water purifier.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome prior art not enough and provide a purifier of gripper swing locking, only need inside and outside rotatory filter core realize the dismouting of filter core promptly, need not other extra operations, it is more convenient more to slide.

In order to solve the technical problem, the utility model adopts the following technical scheme:

a water purifier with swing locking of a jaw comprises a bracket and a machine head, wherein the machine head is arranged on the bracket and also comprises a guide piece and a jaw, the guide piece is movably connected below the machine head, the guide piece is provided with a mounting hole, one end of the clamping jaw is fixedly connected with the bottom surface of the machine head, the other end of the claw penetrates through the mounting hole, one of the machine head and the bracket is provided with a first rotating shaft, the other of the machine head and the bracket is provided with a first shaft hole which is matched with the first rotating shaft, the machine head drives the claw to swing around the first rotating shaft, so as to drive the guide piece to have a first swing position for tightening the clamping jaw and a second swing position for loosening the clamping jaw, the distance between the guide piece and the machine head in the first swing position is larger than the distance between the guide piece and the machine head in the second swing position.

Furthermore, one of the bracket and the guide piece is provided with a second rotating shaft, the other of the bracket and the guide piece is provided with a second shaft hole which is matched with the second rotating shaft, the second rotating shaft is arranged in parallel with the first rotating shaft, and the distance between the second rotating shaft and the first rotating shaft when the guide piece is positioned at the first swinging position is larger than the distance between the second rotating shaft and the first rotating shaft when the guide piece is positioned at the second swinging position.

Furthermore, first shaft hole with the second shaft hole set up in on the support, the second shaft hole is horizontal extension's waist shape hole, the second shaft hole is located the below in first shaft hole, just the guide is located first swing position with during the second swing position, the second pivot is located the homonymy of first pivot.

Furthermore, be equipped with the third pivot on the support and connect the third pivot with the connecting rod of guide, the third pivot with second pivot parallel arrangement, the guide is followed the jack catch swing in-process, the guide is in under the connecting rod pulling, center on the swing of third pivot equidistance.

Furthermore, the third rotating shaft is located above the second rotating shaft, and the swing radius between the third rotating shaft and the second rotating shaft is greater than the swing radius between the first rotating shaft and the second rotating shaft.

Furthermore, one of the machine head and the guide piece is provided with a guide hole, the other of the machine head and the guide piece is provided with a guide rod, and the guide rod slides in the guide hole in the process that the machine head drives the guide piece to swing, so that the guide piece is far away from or close to the machine head in parallel.

Furthermore, one of the machine head and the support is also provided with a fourth rotating shaft, the other of the machine head and the support is provided with a fourth shaft hole which is matched with the fourth rotating shaft, the fourth rotating shaft rotates around the first rotating shaft, and the fourth shaft hole is in the shape of an arc track groove.

Furthermore, the aircraft nose has the installation plane of installation the jack catch, first pivot set up in installation plane's one end, installation plane's the other end is equipped with the boss that upwards extends, the fourth pivot set up in on the boss.

Furthermore, the mounting hole has the surrounding edge of downwardly extending, reaches the spacing limit of surrounding edge upwards extending, spacing limit internal diameter reduces from bottom to top, just the inner wall on spacing limit has first direction curved surface, first direction curved surface to the axle center direction hunch-up of mounting hole.

Furthermore, the outer diameter of the clamping jaw is increased from top to bottom, a second guide curved surface is arranged on the outer wall of the clamping jaw, the second guide curved surface is sunken towards the axis direction of the clamping jaw, and the first guide curved surface is abutted to the second guide curved surface to slide up and down so as to push the clamping jaw to loosen or tighten.

The utility model has the advantages that:

1. the utility model discloses an among the jack catch swing locking purifier, the aircraft nose swings in the support through first pivot, fixes the jack catch on aircraft nose ground and swings along with the aircraft nose swing, and with jack catch matched with guide at the swing in-process, has first swing position and second swing position. Along with the switching of the swing position, the clamping jaws are in a loosening or tightening state. Like this, the user can use the jack catch to lock the bottle, only needs swing the aircraft nose to drive the guide and control opening and the crimple of jack catch, and convenience of customers dismantles the bottle like this, need not other extra operations, and is more convenient.

2. When the guide piece is switched back and forth between the first swing position and the second swing position, the jaw slides in the mounting hole through the change of the distance between the guide piece and the machine head, and the jaw stretches out and draws back. The guide rod is arranged on the guide piece, the guide hole matched with the guide rod is formed in the machine head, and therefore the clamping jaw can stretch out and draw back in the mounting hole by means of up-and-down sliding of the guide rod in the guide hole, matching relation between the machine head and the guide piece is enhanced, and the structure of the machine head and the guide piece is simplified.

3. The aircraft nose passes through first pivot at the support internal rotation, and the guide has guaranteed aircraft nose and guide's swing stability at the swing in-process through the first pivot of second pivot cooperation through setting up the second pivot parallel with first pivot to also further played the guide stable installation in the support. In addition, the same sides of the two rotating shafts are arranged, so that the acting force direction is consistent in the process of swinging the machine head, the machine head is more labor-saving in swinging, and the use by a user is facilitated.

4. The second shaft hole is arranged to be a transversely extending waist-shaped hole, so that the guide piece drives the second rotating shaft to slide in the waist-shaped hole in the swinging process of the handpiece, the movement space of the second rotating shaft is ensured, and meanwhile, the movement track of the guide piece is also limited.

5. Through being equipped with the third pivot in the support outside, and the third pivot is established in the top of second pivot, utilizes the connecting rod to connect third pivot and second pivot, can give the ascending pulling force of second pivot, prevents that the skew of other directions from appearing in the guide moving process thereupon, guarantees that the cooperation between aircraft nose and the guide is inseparable.

6. The fourth pivot is established on the aircraft nose, and the fourth shaft hole is established on the support, and the first pivot of fourth pivot cooperation to it is rotatory around first pivot, and two pivots set up jointly on the aircraft nose, have guaranteed the stability of aircraft nose when the support internal rotation.

Drawings

FIG. 1 is a view showing the combination state of the bottle body of the present invention installed in the support and between the machine head and the guide member;

FIG. 2 is a diagram showing the fitting relationship between the head and the guide member when the guide member is in the second swing position according to the present invention;

fig. 3 is a diagram showing the fitting relationship between the head and the guide member when the guide member is in the first swing position;

FIG. 4 is a diagram showing the relationship between the rotating shafts when the guide member is in the second swing position;

FIG. 5 is a view showing the fitting relationship between the rotating shafts when the guide member is in the first swing position according to the present invention;

FIG. 6 is a schematic structural view of a handpiece of the present invention;

fig. 7 is a schematic structural view of a guide member of the present invention;

FIG. 8 is a schematic view of the head and guide of the present invention with the jaws in an open position;

fig. 9 is a schematic view of the head and guide of the present invention when the jaws are in a retracted state;

fig. 10 is a schematic structural view of the middle sub-frame of the present invention;

FIG. 11 is a schematic view of the middle support, the head, the jaws, the guides and the bottle body of the present invention in a state where the jaws are released;

FIG. 12 is a schematic view of the middle support, the machine head, the clamping jaws, the guiding members and the bottle body when the clamping jaws are tightened and filled;

1. the bottle body comprises a support, 11, a first shaft hole, 12, a second shaft hole, 13, a third rotating shaft, 14, a fourth shaft hole, 15, a mounting opening, 2, a machine head, 21, a first rotating shaft, 22, a guide hole, 23, a fourth rotating shaft, 24, a mounting plane, 241, a boss, 3, a guide piece, 31, a second rotating shaft, 32, a guide rod, 33, a mounting hole, 331, a surrounding edge, 332, a limiting edge, 4, a clamping jaw, 41, a second guide curved surface, 5, a connecting rod, L1, the distance between the guide piece and the machine head in a first swinging position, the distance between the guide piece and the machine head in a L2 and a second swinging position, the distance between the second rotating shaft and the first rotating shaft in the L3 and the first swinging position, the distance between the second rotating shaft and the first rotating shaft in the L4 and the second swinging position, 6 and the bottle body.

Detailed Description

As shown in fig. 1-12, a water purifier locked by swinging of a claw comprises a support 1 and a machine head 2, wherein the machine head 2 is installed on the support 1, the water purifier further comprises a guide member 3 and a claw 4, the guide member 3 is movably connected below the machine head 2, the guide member 3 is provided with an installation hole 33, one end of the claw 4 is fixedly connected to the bottom surface of the machine head 2, the other end of the claw 4 penetrates through the installation hole 33, one of the machine head 2 and the support 1 is provided with a first rotating shaft 21, the other of the machine head 2 and the support 1 is provided with a first shaft hole 11 which is installed in a matching manner with the first rotating shaft 21, the machine head 2 drives the claw 4 to swing around the first rotating shaft 21 so as to drive the guide member 3 to have a first swing position for tightening the claw 4 and a second swing position for loosening the claw 4, and the distance L1 between the guide member 3 and the machine head 2 is set at the first swing position, is greater than the distance L2 between the guide 3 and the head 2 in the second oscillation position.

In the present embodiment, as shown in fig. 2 and 3, when the handpiece 2 swings toward the mounting opening 15 toward the inside of the holder 1, the guide 3 moves in a direction away from the handpiece 2, and when the guide 3 is at the position farthest from the handpiece 2, the claw 4 is retracted in the guide 3, and at this time, the guide 3 is in the first swing position. When the handpiece 2 is swung outward of the mounting opening 15, the guide 3 moves in a direction approaching the handpiece 2, and when the guide 3 is at the position nearest to the handpiece 2, the jaws 4 are opened in the guide 3, and at this time, the guide 3 is at the second swing position. Therefore, the guide 3 is at the farthest end from the handpiece 3 in the first swing position, and the guide 3 is at the nearest end from the handpiece 3 in the second swing position, so L1 is larger than L2.

The utility model discloses an among the jack catch swing locking purifier, aircraft nose 2 swings in support 1 through first pivot 21, fixes jack catch 4 on aircraft nose 2 ground and swings along with aircraft nose 2 swings, and has first swing position and second swing position at the swing in-process with jack catch 4 matched with guide 3. Along with the switching of the swing position, the clamping jaws are in a loosening or tightening state. Like this, the user can use the jack catch to lock the bottle, only needs swing the aircraft nose to drive the guide and control opening and the crimple of jack catch, and convenience of customers dismantles the bottle like this, need not other extra operations, and is more convenient.

One of the bracket 1 and the guide member 3 is provided with a second rotating shaft 31, the other of the bracket 1 and the guide member 3 is provided with a second shaft hole 12 which is matched with the second rotating shaft 31, the second rotating shaft 31 is parallel to the first rotating shaft 21, when the guide member 3 is located at the first swing position, the distance L3 between the second rotating shaft 31 and the first rotating shaft 21 is greater than the distance L4 between the second rotating shaft 31 and the first rotating shaft 21 when the guide member 3 is located at the second swing position. It will be appreciated that the second shaft may be provided on the bracket 1 or on the guide 3, and in this embodiment, as shown in fig. 5-6, the second shaft 31 is provided on the guide 3, and correspondingly, the second shaft hole 12 is provided on the bracket 1. When the guide member 3 is in the first swing position, the guide member 3 is located inside the bracket 1, the second rotating shaft 31 is located at one end of the second shaft hole 12 facing away from the mounting opening 15, when the guide member 3 is in the second swing position, the guide member 3 is located outside the bracket 1, and the second rotating shaft 31 is located at one end of the second shaft hole 12 close to the mounting opening 15, so that L3 is greater than L4.

The guide 3 is through setting up the second pivot 31 parallel with first pivot 21, through the first pivot 21 of second pivot 31 cooperation, has guaranteed the swing stability of aircraft nose and guide at the swing in-process to also further played the stable installation of guide in the support. In addition, the same sides of the two rotating shafts are arranged, so that the acting force direction is consistent in the process of swinging the machine head, the machine head is more labor-saving in swinging, and the use by a user is facilitated.

First shaft hole 11 with second shaft hole 12 set up in on the support 1, second shaft hole 12 is the waist shape hole of horizontal extension, second shaft hole 12 is located the below of first shaft hole 11, just guide 3 is located first swing position with during the second swings the position, second pivot 31 is located the homonymy of first pivot 21. The second shaft hole is arranged to be a transversely extending waist-shaped hole, so that the guide piece drives the second rotating shaft to slide in the waist-shaped hole in the swinging process of the handpiece, the movement space of the second rotating shaft is ensured, and meanwhile, the movement track of the guide piece is also limited.

Be equipped with third pivot 13 on the support 1 and connect third pivot 13 with connecting rod 5 of guide 3, third pivot 13 with second pivot 31 parallel arrangement, guide 3 follows 4 swing in-process of jack catch, guide 3 is in under the pulling of connecting rod 5, center on 13 equidistance swings in third pivot. The third rotating shaft 13 is located above the second rotating shaft 31, and the swing radius between the third rotating shaft 13 and the second rotating shaft 31 is greater than the swing radius between the first rotating shaft 21 and the second rotating shaft 31. Through being equipped with the third pivot in the support outside, and the third pivot is established in the top of second pivot, utilizes the connecting rod to connect third pivot and second pivot, can give the ascending pulling force of second pivot, prevents that the skew of other directions from appearing in the guide moving process thereupon, guarantees that the cooperation between aircraft nose and the guide is inseparable.

One of the machine head 2 and the guide part 3 is provided with a guide hole, the other of the machine head 2 and the guide part 3 is provided with a guide rod, and the guide rod 3 slides in the guide hole in the process that the machine head 2 drives the guide part 3 to swing, so that the guide part 3 is far away or close to the machine head in parallel. It can be understood that the head and the guide member are matched through the guide opening and the guide rod, and the guide rod slides up and down in the guide opening to ensure that the guide member can swing towards the direction close to the head or far away from the head, so that the guide rod can be arranged on any one of the head or the guide member, and correspondingly, the other guide opening is matched with the guide rod. In the present embodiment, as shown in fig. 6 and 7, the guide bar 32 is provided on the guide 3, and the guide port 22 is provided on the handpiece 2. When the guide piece 3 is switched back and forth between the first swing position and the second swing position, the jaw 4 slides in the mounting hole 33 through the change of the distance between the guide piece 3 and the machine head 2, and the stretching of the jaw 4 is realized. Wherein, through set up guide bar 32 on guide 3, set up guide hole 22 with the guide bar complex on aircraft nose 2, like this, utilize guide bar 32 to slide from top to bottom in guide hole 33, realize the flexible in mounting hole 33 of jack catch 4, strengthen the complex relation of aircraft nose 2 and guide 3, also simplified the structure of aircraft nose 2 and guide 3.

One of the machine head 2 and the support 1 is further provided with a fourth rotating shaft, the other one of the machine head 2 and the support is provided with a fourth shaft hole which is matched with the fourth rotating shaft, the fourth rotating shaft surrounds the first rotating shaft 21 to rotate, and the fourth shaft hole is in the shape of an arc track groove. It can be understood that the fourth rotating shaft can be disposed on the bracket or the handpiece, and in this embodiment, as shown in fig. 4-7, the fourth rotating shaft 23 is disposed on the handpiece 2, the fourth shaft hole 14 is disposed on the bracket 1, the fourth rotating shaft 23 is engaged with the first rotating shaft 21 and rotates around the first rotating shaft 21, and the two rotating shafts are disposed on the handpiece together, so as to ensure the stability of the handpiece when rotating in the bracket. Wherein, the vertical setting in fourth shaft hole 14 is on support 1, and fourth shaft hole 14 is towards the arc of first pivot 21 convergence, and the both ends in fourth shaft hole 14 still are equipped with spacing limit.

When the handpiece 2 is in the bracket 1 and the guide member 3 is in the first swing position, the claw 4 is retracted in the mounting hole 33, the second rotating shaft 31 is positioned at one end of the second shaft hole 12 away from the mounting opening 15, and the fourth rotating shaft 23 is positioned at the upper end of the fourth shaft hole 14 and clamped at the position through the limit edge, as shown in fig. 5. When the handpiece 2 is positioned outside the bracket 1 and the guide member 3 is positioned in the second swing position, the claw 4 is positioned outside the mounting hole 33 and is arranged in an open manner, the second rotating shaft 31 is positioned at one end of the second shaft hole 12 close to the mounting opening 15, and the fourth rotating shaft 23 is positioned at the upper end of the fourth shaft hole 14 and is clamped at the secondary position through a limiting edge, as shown in fig. 4. During the oscillation of the head 2, the fourth axis of rotation 23 is not lower than said second axis of rotation 31.

As shown in fig. 6 and 7, the handpiece 2 has a mounting plane 24 for mounting the jaw 4, the first rotating shaft 21 is disposed at one end of the mounting plane 24, the other end of the mounting plane 24 is provided with a boss 241 extending upward, and the fourth rotating shaft 23 is disposed on the boss 24.

As shown in fig. 8 and 9, the mounting hole 33 has a surrounding edge 331 extending downward and a limiting edge 332 extending upward from the surrounding edge 331, the inner diameter of the limiting edge 332 decreases from bottom to top, and the inner wall of the limiting edge 332 has a first guiding curved surface which is arched in the axial direction of the mounting hole 33. The outer diameter of the clamping jaw 4 is increased from top to bottom, a second guide curved surface 41 is arranged on the outer wall of the clamping jaw 4, the second guide curved surface 41 is sunken towards the axis direction of the clamping jaw 4, and the first guide curved surface is abutted to the second guide curved surface 41 to slide up and down so as to push the clamping jaw 4 to loosen or tighten.

As shown in fig. 4-5 and 11-12, in this embodiment, when the handpiece 2 rotates around the first rotating shaft 21 toward the mounting opening 15, the fourth rotating shaft 23 on the handpiece 2 moves from the upper end to the lower end of the fourth shaft hole 14, the second rotating shaft 31 slides from the end away from the mounting opening 15 toward the end close to the mounting opening 15 in the second shaft hole 12, and at this time, the guide 3 swings from the first swing position to the second swing position, the latch 4 is in a released state, and the bottle body 6 can be detached. When the machine head 2 rotates around the first rotating shaft 21 towards the inner side of the bracket 1, the fourth rotating shaft 23 on the machine head 2 moves from the lower end to the upper end of the fourth shaft hole 14, the second rotating shaft 31 slides from one end close to the mounting port 15 to one end far away from the mounting port 15 in the second shaft hole 12, at this time, the guide member 3 swings from the second swing position to the first swing position, the clamping jaws 4 are in a tightening state, and the bottle body 6 can be locked.

Claims

1. A water purifier with a clamping claw locked in a swinging way comprises a bracket and a machine head, wherein the machine head is arranged on the bracket, it is characterized by also comprising a guide piece and a jaw, wherein the guide piece is movably connected below the machine head, the guide piece is provided with a mounting hole, one end of the clamping jaw is fixedly connected with the bottom surface of the machine head, the other end of the clamping jaw penetrates through the mounting hole, one of the machine head and the bracket is provided with a first rotating shaft, the other of the machine head and the bracket is provided with a first shaft hole which is matched and installed with the first rotating shaft, the machine head drives the clamping jaw to swing around the first rotating shaft, so as to drive the guide piece to have a first swing position for tightening the clamping jaw and a second swing position for loosening the clamping jaw, the distance between the guide piece and the machine head in the first swing position is larger than the distance between the guide piece and the machine head in the second swing position.

2. The claw swing locking water purifier according to claim 1, wherein one of the bracket and the guide member is provided with a second rotating shaft, the other of the bracket and the guide member is provided with a second shaft hole matched with the second rotating shaft, the second rotating shaft is parallel to the first rotating shaft, and the distance between the second rotating shaft and the first rotating shaft when the guide member is located at the first swing position is larger than the distance between the second rotating shaft and the first rotating shaft when the guide member is located at the second swing position.

3. The jaw swing locking water purifier according to claim 2, wherein the first shaft hole and the second shaft hole are disposed on the bracket, the second shaft hole is a waist-shaped hole extending transversely, the second shaft hole is disposed below the first shaft hole, and the guide member is disposed at the same side of the first shaft when the first swing position and the second swing position are disposed.

4. The water purifier locked by the swing of the claw according to claim 2, wherein a third rotating shaft and a connecting rod for connecting the third rotating shaft and the guide member are arranged on the bracket, the third rotating shaft and the second rotating shaft are arranged in parallel, and in the process that the guide member swings along with the claw, the guide member swings around the third rotating shaft at equal intervals under the pulling of the connecting rod.

5. The jaw swing locking water purifier according to claim 4, wherein the third rotating shaft is located above the second rotating shaft, and a swing radius between the third rotating shaft and the second rotating shaft is larger than a swing radius between the first rotating shaft and the second rotating shaft.

6. The water purifier with swing locking of jaws as claimed in claim 1, wherein one of said head and said guide is provided with a guide hole, and the other of said head and said guide is provided with a guide rod, and during the swing of said guide driven by said head, said guide rod slides in said guide hole to make said guide move away from or close to said head in parallel.

7. The jaw swing locking water purifier according to any one of claims 1-6, wherein one of the machine head and the bracket is further provided with a fourth rotating shaft, the other of the machine head and the bracket is provided with a fourth shaft hole which is matched with the fourth rotating shaft, the fourth rotating shaft rotates around the first rotating shaft, and the fourth shaft hole is in the shape of an arc track groove.

8. The jaw swing locking water purifier as claimed in claim 7, wherein the head has a mounting plane for mounting the jaw, the first shaft is disposed at one end of the mounting plane, the other end of the mounting plane is disposed with a boss extending upward, and the fourth shaft is disposed on the boss.

9. The claw swing locking water purifier as claimed in any one of claims 1-6, wherein the mounting hole has a downward extending peripheral edge and an upward extending limiting edge, the inner diameter of the limiting edge decreases from bottom to top, and the inner wall of the limiting edge has a first guiding curved surface which is arched towards the axial center of the mounting hole.

10. The jaw swing locking water purifier according to claim 9, wherein the jaw has an increased outer diameter from top to bottom, and the outer wall of the jaw has a second guiding curved surface, the second guiding curved surface is recessed toward the axial center of the jaw, and the first guiding curved surface abuts against the second guiding curved surface to slide up and down to push the jaw to loosen or tighten.