CN111745577A - A kind of spanner - Google Patents

Abstract

The invention discloses a wrench, which comprises a handle part and a clamping part, wherein the clamping part comprises a first clamping part and a second clamping part, the handle part is integrally connected with a baffle, the baffle is clamped at the outer side of the first clamping part, the clamping part is symmetrically provided with a first groove body and a first ratchet wheel positioned in the first groove body at two sides of a cavity, the outer side of the clamping part is provided with a second ratchet wheel, the second clamping part is clamped with a limiting piece, the limiting piece is provided with a second groove body, a sliding piece matched with the first ratchet wheel for changing the size of the cavity is arranged in the second groove body, the second clamping part is symmetrically provided with a bulge close to the first clamping part, the bulge is provided with a buckle structure, and one end of the first clamping part close to the second clamping part is provided with a through groove matched; one side of the handle part close to the clamping part is provided with a transmission part which is matched with the second ratchet wheel for use so as to realize the forward rotation and the reverse rotation of the second ratchet wheel. The wrench of the invention can realize the adjustable opening size and the continuous operation.

Description

a wrench

technical field

The present invention relates to hand tools, in particular to a wrench.

Background technique

At present, there are several types of wrenches commonly used in production and life, such as fixed wrenches, adjustable wrenches, and ratchet wrenches. One or both ends of the wrench have a fixed size opening. One wrench cannot meet the needs of various specifications of work, so it will be made into various specifications, and complex work needs to carry more than one. The opening width of the adjustable wrench can be adjusted within a certain size range, and it can rotate bolts or nuts of different specifications, but the handle of the existing adjustable wrench can only be rotated by a small angle, so the workpiece needs to be rotated continuously for many times. , can be tightened or loosened. Between two rotations, it is necessary to stop and rotate the wrench in the opposite direction. The usual method is to separate the wrench from the workpiece, and then put it on again and rotate it again. This operation method is very inconvenient and the rotation efficiency is low. The ratchet handle can simplify this operation. During rotation, the wrench can be rotated without disengaging the wrench from the workpiece. However, the opening size of the common ratchet wrench is fixed and cannot be adjusted, which is very inconvenient. It is more difficult to combine the ratchet structure with the adjustable opening.

SUMMARY OF THE INVENTION

In order to solve the problem that the opening of the existing adjustable wrench is adjustable, but it needs to be temporarily detached from the workpiece before it can be rotated and then re-sleeved to rotate, which is troublesome to operate and has low efficiency, the purpose of the present invention is to provide a wrench whose opening size can be adjusted It can be adjusted continuously and quickly without leaving the workpiece, the operation is simple, and the work efficiency is improved.

In order to achieve the above purpose, the present invention adopts the following technical solutions: a wrench includes a handle part and a clamping part, the clamping part includes a first clamping part and a second clamping part, and the handle part is integrally connected with a stopper plate, the baffle is clamped on the outer side of the first clamping part, the first clamping part and the second clamping part are connected to enclose a cavity for accommodating the component to be rotated, and the clamping part is located in the cavity A first groove body and a first ratchet wheel located in the first groove body are symmetrically arranged on both sides of the clamp, a second ratchet wheel is arranged on the outside of the clamping portion, and a limiting member is clamped on the second clamping portion, and the limiting The end face of the positioning member is provided with a second groove body, the second groove body is communicated with the side surface of the limiting member, and a sliding member that cooperates with the first ratchet to change the size of the cavity is arranged in the second groove body, and the handle The side of the part close to the clamping part is provided with a transmission member which cooperates with the second ratchet to realize the forward and reverse rotation of the second ratchet.

The above components to be rotated can be nuts, bolts, screws and nuts. The first clamping part and the second clamping part can be arranged separately or integrally. When the second clamping part and the first clamping part are arranged separately, the wrench of the present invention is also suitable for the part to be rotated that is arranged in an infinite length. on the rod.

When in use, the limiting member is clamped on the second clamping part, and connects the first clamping part and the second clamping part to enclose a cavity. Place the part to be rotated in the cavity, rotate the limiter, the slider on the limiter engages with the first ratchet, and moves on the first ratchet until the limiter contacts the part to be rotated and fixes the part to be rotated. The rotating part is rotated; the handle part acts on the transmission part with external force, and the transmission part drives the second ratchet to rotate, so as to tighten or loosen the to-be-rotated part.

The stopper is used in conjunction with the first ratchet to fix the to-be-rotated part; the transmission part is used in conjunction with the second ratchet to tighten or loosen the to-be-rotated part through the drive of the handle, so as to realize continuous screwing without the need for further screwing. Remove the wrench from the part to be turned during the turning process.

The sliding member includes a button, a first spring connected to the button, and a first pawl located at the end of the first spring, the first pawl protruding from the side end of the second groove body and engaging with the first ratchet .

When the limiter is slid in the forward direction, the cavity gradually decreases. When the cavity needs to be enlarged, turn the button in the direction of the center of the cavity and hold it. The button drives the first pawl, and the first pawl retracts into the second groove. You can slide the limiter in reverse, release the button, and the position of the limiter is fixed.

Wherein, the second clamping part is provided with a first socket on the outer side of the first ratchet, and the limiting member is provided with a first plug matching with the first socket at the corresponding position of the first socket, and the first plug is connected to the button. Connect, insert or leave the first jack by the action of the button.

Wherein, the second clamping part is symmetrically provided with a protrusion close to the first clamping part, the protrusion is provided with a buckle structure, and one end of the first clamping part close to the second clamping part is provided with a The through slot used with the snap structure.

Preferably, the buckle structure includes a second spring and a clip connected to the second spring, and the clip extends into or out of the through groove under the action of an external force.

The buckle structure is used to fix the first clamping part and the second clamping part, and the second clamping part is moved towards the direction of the first clamping part until the clip is inserted into the through groove, and the first clamping part and the second clamping part are completed. The fixing process of the clamping part; when the second clamping part needs to be removed, press the clamp and do not move, the clamp drives the second spring to leave the through groove, and the second clamping part can move freely.

Wherein, the transmission member includes a cylinder, a knob is arranged at the top of the cylinder, a second pawl and a third pawl are cross-sleeved at the bottom end of the cylinder, and a fixing rod is connected to one side of the cylinder, so The other side of the cylinder is connected with a rotating rod, and the side of the handle part close to the transmission member is provided with a fixed groove, the fixed rod is located in the fixed groove, and is moved back and forth in the fixed groove by external force, and the rotating rod Located between the second pawl and the third pawl, the second pawl and the third pawl are respectively engaged with the second ratchet.

When it is necessary to turn the handle clockwise, turn the knob clockwise, the fixed rod and the rotating rod rotate accordingly, the fixed rod is fixed on one side of the fixed groove, and the rotating rod bears the second pawl (third pawl), Make the second pawl (third pawl) unable to contact the second ratchet, the third pawl (second pawl) and the second ratchet, turn the handle clockwise, the third pawl (second pawl) ) is engaged with the second ratchet, and the handle part can be continuously pulled to tighten or loosen the part to be rotated without leaving the part to be rotated during the pulling process, and the operation efficiency is higher; on the contrary, when the handle part needs to be pulled counterclockwise , turn the knob counterclockwise, the fixed rod and the rotating rod rotate accordingly, so that the fixed rod is fixed on the other side of the fixed groove, and the rotating rod bears the third pawl (the second pawl), so that the third pawl (the second pawl) The second pawl (the second pawl) cannot contact the second ratchet wheel, the second pawl (the third pawl) is in contact with the second ratchet wheel, and the handle is turned counterclockwise, and the second pawl (the third pawl) engages with the second ratchet wheel, The handle can be continuously moved to loosen or tighten.

Wherein, one end of the baffle is hinged with a ring body, the end of the ring body is provided with a lock, and the other end of the baffle is provided with a lock head used in cooperation with the lock.

The arrangement of the ring body, the lock catch and the lock head can fix the first clamping part and the second clamping part, so that the wrench of the present invention is more stable in use.

Wherein, a first clamping surface and a second clamping surface are movably provided inside the first clamping portion.

The above-mentioned movable setting means that the first clamping surface and the second clamping surface can move up and down along the first clamping part, or the first clamping surface and the second clamping surface can be separated from the first clamping part. , to replace the first clamping surface and the second clamping surface.

The first clamping surface and the second clamping surface are specially provided for the relatively small parts to be rotated, and the first clamping surface and the second clamping surface are surfaces in contact with the parts to be rotated, and are used to fix the parts to be rotated The limiter is used to fix the other surface of the component to be rotated, and the first clamping surface, the second clamping surface and the stopper fix the three surfaces of the component to be rotated, ensuring that the component to be rotated is rotated. stability when moving.

Wherein, the connecting ends of the first clamping surface, the second clamping surface and the first clamping part are provided with a fourth spring and a plug-in connected with the fourth spring, and the end of the plug-in away from the fourth spring has a smooth curved surface, so The first clamping part is provided with a plurality of third groove bodies which are used in cooperation with the insert.

When it is necessary to move the first clamping surface and the second clamping surface up and down, act on the first clamping surface and the second clamping surface up or down, the plug-in leaves one of the third grooves, and stops when it reaches a suitable position. The insert is clamped in another third groove body; when the first clamping surface and the second clamping surface are used to fix the component to be rotated, the upper end surfaces of the first clamping surface and the second clamping surface are in the same horizontal plane.

By adopting the above solution, the positions of the first clamping surface and the second clamping surface can be adjusted to avoid the problem that the component to be rotated is too small to be suspended, and the component to be rotated cannot be properly tightened or loosened.

Wherein, the upper and lower end faces of the second clamping part are symmetrically provided with first grooves, the side of the second clamping part close to the first clamping part is provided with a second groove, the first grooves The groove and the second groove are used for clamping the stopper.

Wherein, the first clamping part and the second clamping part are fixedly connected.

The first clamping portion and the second clamping portion may be integrally connected.

Wherein, the first clamping part and the second clamping part are detachably connected.

Preferably, the second clamping part is symmetrically provided with a protrusion close to the first clamping part, the protrusion is provided with a buckle structure, and the first clamping part is provided close to one end of the second clamping part There are through slots for use with the snap structure.

Wherein, the second clamping portion and the limiting member are respectively connected with the first clamping portion through a third spring.

The second clamping part and the limiting part are connected with the first clamping part by a spring, so that the wrench of the present invention is not only suitable for the part to be rotated on an infinitely long rod, but also avoids the need for removing the second clamping part after removing the second clamping part. Parts and stoppers are lost.

Wherein, the first clamping part is provided with a rotating shaft, and the second clamping part is movably connected with the first clamping part through the rotating shaft.

Compared with the prior art, the present invention has the beneficial effects: the wrench of the present invention can realize adjustable opening size, tighten or loosen the parts to be rotated with different sizes, and can continuously pull the parts to be rotated, There is no need to leave the to-be-rotated part in the process of pulling the to-be-rotated part, which improves work efficiency.

Description of drawings

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments:

1 is a perspective view of a wrench disclosed in Embodiment 1 of the present invention;

Fig. 2 is a partial enlarged view at Fig. 1A;

3 is a top view of the wrench disclosed in Embodiment 1 of the present invention;

Fig. 4 is a sectional view in the direction of Fig. 3d-d;

5 is a schematic structural diagram of a transmission member in the wrench disclosed in Embodiment 1 of the present invention;

6 is a front view of the wrench disclosed in Embodiment 1 of the present invention;

Fig. 7 is the sectional view of Fig. 6b-b direction;

8 is a right side view of the wrench disclosed in Embodiment 1 of the present invention;

FIG. 9 is a cross-sectional view in the direction of FIG. 8 c-c;

Fig. 10 is a partial enlarged view at C of Fig. 9;

Figure 11 is a sectional view in the direction of Figure 8e-e;

12 is a connection diagram of a third button and a clip in the wrench disclosed in Embodiment 1 of the present invention;

Fig. 13 is a partial enlarged view of part B of Fig. 12;

14 is a perspective view of the wrench disclosed in Embodiment 2 of the present invention;

15 is a perspective view of the wrench disclosed in Embodiment 3 of the present invention;

16 is a perspective view of the wrench disclosed in Embodiment 4 of the present invention;

17 is a perspective view of the wrench disclosed in Embodiment 5 of the present invention;

Figure 18 is a perspective view of the wrench disclosed in Embodiment 5 of the present invention after the second clamping portion is connected to the limiting member;

FIG. 19 is a diagram showing the connection relationship between the button and the first plug in the wrench disclosed in Embodiment 5 of the present invention.

Among them: the first clamping part 1, the second clamping part 2, the cavity 3, the first clamping surface 4, the second clamping surface 5, the first groove body 6, the first ratchet wheel 7, the second ratchet wheel 8, The first groove 9, the second groove 10, the limiter 11, the second groove body 12, the protrusion 14, the buckle structure 15, the through groove 16, the handle part 17, the transmission part 18, the button 19, the first Spring 20, first pawl 21, second spring 22, clip 23, cylinder 24, knob 25, second pawl 26, third pawl 27, fixing rod 28, rotating rod 29, fixing groove 30, lock Buckle 31, lock head 32, fourth spring 33, insert 34, third groove body 35, third spring 36, baffle 37, ring body 38, first plug 39, first socket 40, third button 44, The fifth spring 45 , the rotating shaft 46 , the telescopic rod 47 , and the sixth spring 48 .

Detailed ways

The embodiments of the present invention are described below by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

See Figures 1 through 19. It should be noted that the structures, proportions, sizes, etc. shown in the drawings in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with the technology, and are not used to limit the implementation of the present invention. Restricted conditions, it does not have technical substantive significance, any structural modification, proportional relationship change or size adjustment, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the present invention. The disclosed technical content must be within the scope of coverage. At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and clarity, and are not used to limit this specification. The implementable scope of the invention, and the change or adjustment of the relative relationship thereof, shall also be regarded as the implementable scope of the present invention without substantially changing the technical content.

Example 1

As shown in Figures 1 and 2, a wrench includes a handle part 17 and a clamping part, the clamping part includes a first clamping part 1 and a second clamping part 2, the handle part 17 is integrally connected with a baffle 37, and the baffle 37 It is clamped on the outside of the first clamping part 1. The first clamping part 1 and the second clamping part 2 enclose a cavity 3 for accommodating the component to be rotated. The inner side of the first clamping part 1 is movably provided with a first clamping part. Surface 4 and second clamping surface 5, the number of the first clamping surface 4 and the second clamping surface 5 may not be limited to 1, and the number of the first clamping surface 4 and the second clamping surface 5 may be the same , can also be different. Commonly used components to be rotated are hexagonal nuts, bolts, screws and nuts, and the included angle between adjacent sides is 60°. In order to increase the stability and effectiveness of the wrench during use, the first clamping surface 4 and the second clamping surface The included angle of the holding surface 5 is preferably set to 60°. The clamping part is symmetrically provided with a first groove body 6 and a first ratchet wheel 7 located in the first groove body 6 on both sides of the cavity 3 , and a second ratchet wheel 8 is provided outside the clamping part. The lower end face is symmetrically provided with a first groove 9, the side of the second clamping part 2 close to the first clamping part 1 is provided with a second groove 10, the first groove 9 and the second groove 10 are used for The workpiece 11 is clamped. The upper and lower end faces of the workpiece 11 are respectively symmetrically provided with a second groove body 12. The second groove body 12 is communicated with the side surface of the workpiece 11. The ratchet 7 is used in conjunction with a sliding member to change the size of the cavity 3. The second clamping part 2 is symmetrically provided with a protrusion 14 close to the first clamping part 1. The protrusion 14 is provided with a buckle structure 15. The first clamping part 1. One end close to the second clamping part 2 is provided with a through groove 16 for use with the buckle structure 15; , the reverse transmission member 18 .

The workpiece 11 has a symmetrical structure up and down. When in use, the upper or lower half of the workpiece 11 is used alone, and the upper or lower half of the workpiece 1 is clamped in the first groove 9 and the lower half. In the second groove 10, the same working process as the workpiece 11 can be completed to realize the fixation of the to-be-rotated part; In the half or lower half, the workpiece 11 has better stability of the part to be rotated.

3 and 4, the connecting ends of the first clamping surface 4, the second clamping surface 5 and the first clamping part 1 are provided with a fourth spring 33 and a plug-in 34 connected with the fourth spring 33, and the plug-in 34 is far away from the first clamping part 1. One end of the four springs 33 has a smooth curved surface, and the first clamping part 1 is juxtaposed with a plurality of third groove bodies 35 that cooperate with the insert 34 .

When it is necessary to move the first clamping surface 4 and the second clamping surface 5 up and down, an upward or downward force is applied to the first clamping surface 4 and the second clamping surface 5, and the fourth spring 33 is affected by the external force. Squeeze to drive the insert 34 to leave the original third groove body 35 and fix it in another third groove body 35 to a proper position.

The number of the third groove bodies 35 may be 2, or may be 3, 4, or even more, which may be set according to the needs of use.

The positions of the first clamping surface 4 and the second clamping surface 5 can be adjusted, so that the wrench of the present invention can be applied to parts to be rotated of different sizes, avoiding the problem that the parts to be rotated that are too small in size are suspended in the cavity 3 .

As shown in FIGS. 8 , 9 and 10 , the slider includes a button 19 , a first spring 20 connected to the button 19 and a first pawl 21 at the end of the first spring 20 , the first pawl 21 protruding from the second groove body 12 The side end is engaged with the first ratchet 7 . Since the sawtooth direction of the first ratchet wheel 7 is to the left, the first ratchet pawl 21 can only slide to the left, and tightly clamps the component to be rotated; Press and hold the button 19, the first pawl 21 is acted by the first spring 20 to return to the second groove body 12, when the workpiece 11 is moved to the right position, release the button 19, the first pawl 21 and the A ratchet 7 is engaged, and the first pawl 21 cannot continue to slide to the right.

As shown in Figures 5, 6 and 7, the transmission member 18 includes a cylinder 24, a knob 25 is provided at the top of the cylinder 24, and a second pawl 26 and a third pawl 27 are cross-sleeved at the bottom end of the cylinder 24. The cylinder 24 One side is connected with a fixed rod 28, the other side of the cylinder 24 is connected with a rotating rod 29, a side of the handle portion 17 close to the transmission member 18 is provided with a fixed groove 30, and the fixed rod 28 is located in the fixed groove 30, and is affected by external force. The fixed groove 30 moves back and forth, the rotating rod 29 is located between the second pawl 26 and the third pawl 27, the second pawl 26 and the third pawl 27 are respectively engaged with the second ratchet 8, and the second pawl 26 The third pawl 27 is connected with the handle part 17 through the sixth spring 48 respectively.

As shown in FIGS. 8 and 11 , the buckle structure 15 includes a second spring 22 and a clip 23 connected with the second spring 22 , and the clip 23 extends into or out of the through slot 16 under the action of an external force.

After using the wrench of the present invention, it is necessary to hold down the clip 23 to make the clip structure 15 leave the through slot 16, but when the diameter of the part to be rotated is large, the operator cannot reach into the cavity 3 to complete the above operation, such as: 12 and 13, a third button 44 is provided on the side of the second clamping part 2, and a telescopic rod 47 is provided at the end of the third button 44. The telescopic rod 47 extends inward and is fixedly connected to the clip 23, and the telescopic rod 47 is covered A fifth spring 45 is provided.

The telescopic rod 47 is fixedly connected with the third button 44 , and the telescopic rod 47 moves back and forth under the action of the fifth spring 45 .

When in use, the workpiece 11 is clamped on the second clamping part 2, and then the clamping structure 15 of the second clamping part 2 is fixed in the through groove 16 to realize the first clamping part 1 and the second clamping part. At this time, the first clamping part 1 and the second clamping part 2 enclose a cavity 3 for placing the parts to be rotated. Place the part to be rotated in the cavity 3, the first clamping surface 4 and the second clamping surface 5 of the first clamping part 1 fix the two surfaces of the part to be rotated, rotate the workpiece 11, the workpiece 11 The sliding piece on the upper part engages with the first ratchet wheel 7 and moves on the first ratchet wheel 7 until the workpiece 11 contacts the part to be rotated and fixes the other surface of the part to be rotated, the first clamping surface 4, the second The clamping surface 5 and the workpiece 11 form three surfaces for fixing the component to be rotated, so as to ensure the stability of the component to be rotated during the rotation process; The fixed rod 28 and the rotating rod 29 rotate accordingly, the fixed rod 28 is fixed to one end of the fixed groove 30, and the rotating rod 29 blocks the second pawl 26 (third pawl 27), so that the second pawl 26 (third pawl 27) 27) The second ratchet wheel 8 cannot be contacted, the third pawl 27 (second pawl 26) is in contact with the second ratchet wheel 8, and the handle part 17 is rotated clockwise, and the third pawl 27 (second pawl 26) is in contact with the second ratchet wheel 8. The two ratchet wheels 8 are engaged, and the handle part 17 can be continuously rotated to tighten or loosen the part to be rotated without leaving the part to be rotated during the rotation process, and the operation efficiency is higher; on the contrary, the action of rotating the handle part 17 counterclockwise and clockwise rotation resemblance.

When the tightening or unscrewing process of the to-be-rotated part is over, put your hand into the cavity 3 and press the clip 23 so that the clip structure 15 leaves the through slot 16, or directly press the third button 44 and release it. 44 drives the clip 23 to leave the through groove 16, and the first clamping part 1 and the second clamping part 2 are relatively separated.

Example 2

As shown in FIG. 14 , the difference from Embodiment 1 is that one end of the baffle 37 is hinged with a ring body 38 , the end of the ring body 38 is provided with a lock 31 , and the other end of the baffle 37 is provided with a lock for use with the lock 31 . Head 32.

Before turning the handle part 17, the lock 31 of the ring body 38 needs to be buckled in the lock head 32 to fix the to-be-rotated part twice, so as to avoid the hanging problem of the to-be-screwed part during the tightening and loosening process.

Example 3

As shown in FIG. 15 , the difference from Embodiment 2 is that the second clamping part 2 and the workpiece 11 are respectively connected to the first clamping part 1 through a third spring 36 .

The second clamping part 2 and the workpiece 11 are connected to the first clamping part 1 through the third spring 36, so that the wrench of the present invention is still in a connected state when not in use, avoiding the second clamping part 2, the workpiece. The shape part 11 is lost and affects the normal use.

Example 4

As shown in FIG. 16 , the difference from Embodiment 2 is that the first clamping part 1 is provided with a rotating shaft 46 , and the second clamping part 2 is movably connected to the first clamping part 1 through the rotating shaft 46 .

Example 5

17 , 18 and 19 , the difference from Embodiment 4 is that the second clamping part 2 is provided with a first insertion hole 40 on the outer side of the first ratchet 7 , and the workpiece 11 is arranged at a corresponding position of the first insertion hole 40 . There is a first plug 39 matched with the first jack 40 . The first plug 39 is connected to the button 19 and inserted into or leaves the first jack 40 under the action of the button 19 .

After the wrench of the present invention is used, slide the workpiece 11 along the opposite direction of the handle portion 17 to the outermost side, and insert the first plug 39 into the first insertion hole 40, so that the workpiece 11 is fixed to the second clamping portion 2. , to avoid the problem that the workpiece 11 falls off when the wrench is opened.

The number of the first jacks 39 may be one or more. In actual use, the first jacks 40 tend to be set in an even number, and the even number of the first jacks 40 are arranged symmetrically.

The above-mentioned embodiments merely illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed in the present invention should still be covered by the claims of the present invention.

Claims (10)

1. A wrench comprises a handle part (17) and a clamping part, and is characterized in that the clamping part comprises a first clamping part (1) and a second clamping part (2), the handle part (17) is integrally connected with a baffle (37), the baffle (37) is clamped on the outer side of the first clamping part (1), the first clamping part (1) and the second clamping part (2) are connected to enclose a cavity (3) for accommodating a part to be rotated, a first groove body (6) and a first ratchet wheel (7) positioned in the first groove body (6) are symmetrically arranged on two sides of the clamping part positioned in the cavity (3), a second ratchet wheel (8) is arranged on the outer side of the clamping part, a limiting part (11) is clamped on the second clamping part (2), a second groove body (12) is arranged on the end face of the limiting part (11), and the second groove body (12) is communicated with the side face of the limiting part (11), a sliding part which is matched with the first ratchet wheel (7) for use so as to change the size of the cavity (3) is arranged in the second groove body (12), and a transmission part (18) which is matched with the second ratchet wheel (8) for use so as to realize the forward rotation and the reverse rotation of the second ratchet wheel (8) is arranged on one side of the handle part (17) close to the clamping part.

2. A wrench as claimed in claim 1, wherein the slider comprises a button (19), a first spring (20) connected to the button (19) and a first pawl (21) at the end of the first spring (20), the first pawl (21) extending beyond the side end of the second slot (12) to engage with the first ratchet (7).

3. A wrench as claimed in claim 2, wherein the second clamping portion (2) is provided with a first socket (40) at an outer side of the first ratchet (7), the retaining member (11) is provided with a first plug (39) at a position corresponding to the first socket (40) and adapted to the first socket (40), the first plug (39) is connected to the button (19) and is inserted into or removed from the first socket (40) by the button (19).

4. The wrench according to claim 1, wherein the transmission member (18) comprises a cylinder (24), a knob (25) is disposed at the top end of the cylinder (24), a second pawl (26) and a third pawl (27) are crossly sleeved at the bottom end of the cylinder (24), a fixing rod (28) is connected to one side of the cylinder (24), a rotating rod (29) is fixed to the other side of the cylinder (24), a fixing groove (30) is disposed at one side of the handle portion (17) close to the transmission member (18), the fixing rod (28) is disposed in the fixing groove (30) and moves back and forth in the fixing groove (30) under the action of an external force, the rotating rod (29) is disposed between the second pawl (26) and the third pawl (27), and the second pawl (26) and the third pawl (27) are respectively engaged with the second ratchet wheel (8).

5. The wrench according to claim 1, wherein one end of the baffle (37) is hinged to a ring body (38), a lock catch (31) is arranged at the end of the ring body (38), and a lock head (32) matched with the lock catch (31) is arranged at the other end of the baffle (37).

6. A wrench as claimed in claim 1, wherein said first clamping portion (1) is provided with a first gripping surface (4) and a second gripping surface (5) movable inwardly.

7. A wrench as claimed in claim 6, wherein the connection ends of the first clamping surface (4), the second clamping surface (5) and the first clamping portion (1) are provided with a fourth spring (33) and an insert (34) connected with the fourth spring (33), one end of the insert (34) far away from the fourth spring (33) is provided with a smooth curved surface, and the first clamping portion (1) is provided with a plurality of third grooves (35) used in cooperation with the insert (34).

8. A wrench as claimed in any one of claims 1 to 7, wherein the first clamping part (1) and the second clamping part (2) are releasably connected.

9. A wrench as claimed in any one of claims 1 to 7, wherein said second clamping portion (2) and said retaining member (11) are each connected to said first clamping portion (1) by a third spring (36).

10. A wrench as claimed in any one of claims 1 to 7, wherein the first clamping portion (1) is provided with a pivot shaft (46), and the second clamping portion (2) is movably connected to the first clamping portion (1) via the pivot shaft (46).

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