CN114179000A

CN114179000A - Clamping tool

Info

Publication number: CN114179000A
Application number: CN202111532179.1A
Authority: CN
Inventors: 刘少江; 闵航; 肖兆孟
Original assignee: Saame Tools Shanghai Import & Export Co ltd
Current assignee: Saame Tools Shanghai Import & Export Co ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-03-15
Also published as: WO2023109146A1

Abstract

The invention relates to a clamping tool, which comprises a sliding rod, a fixed clamp body fixed on the sliding rod, a movable clamp body sleeved on the sliding rod in a sliding manner, a movable chuck arranged on the movable clamp body in a sliding manner, and a clamping handle fixedly arranged on the movable clamp body, wherein a rack is arranged on one side of the movable chuck facing the clamping handle, a gear part meshed with the rack along a circular track is arranged on one side of the clamping handle facing the sliding rod, and the clamping handle is operated to enable the gear part to be meshed with the rack along the circular track, so that the movable chuck moves linearly along a linear direction towards or away from the fixed clamp body relative to the movable clamp body. The movable chuck and the fixed chuck move linearly in the vertical direction through the gear which is arranged on the clamping handle and moves along the circular track and the rack which is arranged on the movable chuck, so that the movable chuck and the fixed chuck clamp an object, and the movable chuck and the fixed chuck do not shake in the left and right directions in the clamping process.

Description

Clamping tool

Technical Field

The invention relates to a clamping fixture, in particular to a clamping tool type clamp.

Background

The F-shaped clamp is a common manual clamping tool, when the clamping tool with the structure is used for clamping an object, the fixed clamp body and the movable clamp head are drawn close to the object and contacted with the object by sliding the movable clamp body, and then the clamping function of the object can be realized by keeping a proper clamping position. In the utility model patent with publication number CN209566035U, the clamping handle is provided with a cam portion, and the clamping handle is operated to make the cam portion extrude the movable chuck to realize clamping or make the cam portion leave the movable chuck to realize releasing, when the cam abuts against the movable chuck, because the shape of the cam portion and the movement track thereof can make the cam portion have a horizontal displacement, on one hand, the movable chuck can shake in the left-right direction because the movable chuck is not limited, and on the other hand, the horizontal displacement of the movable chuck is not beneficial to protecting the surface integrity of the clamped object. And the cam part of the clamping handle is an irregular cam line, so that the forming precision and precision are low in the die-casting process.

Therefore, there is a need to provide a new clamping tool to overcome the above-mentioned drawbacks.

Disclosure of Invention

The invention aims to provide a clamping tool, which aims to solve the problem that a clamping handle shakes left and right in the process of operating a movable chuck and improve the stability of the clamping tool in the process of clamping an object.

The purpose of the invention is realized by the following technical scheme: the utility model provides a clamping tool, includes the slide bar, is fixed in the fixed clamp body, the slip cap of slide bar are located the activity clamp body of slide bar, clamping tool still including slide set up in activity chuck and the rotatory fixed setting on the activity clamp body in the tight handle of clamp of activity clamp body, one side of activity chuck sets up the rack that has a plurality of teeth that distribute along a straight line, press from both sides tight handle orientation one side of slide bar be provided with have a plurality of along the circular orbit distribute the tooth and with rack intermeshing gear portion, the operation it makes it relative to press from both sides tight handle the activity clamp body is rotatory and drive gear portion with the rack toothing transmission, so that the activity chuck is followed linear direction is relative the activity clamp body orientation is close to or keeps away from linear motion is made to fixed clamp body orientation.

Furthermore, the movable chuck is provided with a pair of side lugs respectively positioned at two sides of the movable clamp body, each side lug is provided with the rack, the clamping handle comprises a pair of side plate parts respectively positioned at two sides of the movable clamp body, each side plate part is fixedly positioned with the gear parts, the gear parts are symmetrically arranged at two sides of the movable clamp body, and the gear parts are meshed with the corresponding racks.

Furthermore, each side ear is provided with a movable hole, a guide pin is further arranged on the movable clamp body corresponding to the movable hole, the guide pin is sleeved in the movable hole, and the guide pin and the movable hole are in sliding fit with each other along the linear direction.

Further, the movable hole is along the oval setting of rectilinear direction, and sets up to one, the uide pin sets up to be in a pair of or one of rectilinear direction.

Further, the clamping handle further comprises a reinforcing member which penetrates through the side plate portions and the movable clamp body to fix the clamping handle to the movable clamp body in a rotating manner, the gear portions are fixedly arranged on two sides of the pair of side plate portions of the clamping handle, and the outer end of the reinforcing member is rotationally fixed to the gear portions.

Further, the reinforcing member is a pin, and the movable clamp body, the side plate portion and the gear portion are provided with fixing holes corresponding to the reinforcing member.

Furthermore, the side plate part of the clamping handle is provided with a buckling hole, the gear part extends towards the side plate part to form a clamping block, and the clamping block is clamped in the buckling hole.

Furthermore, a ratchet wheel is arranged on the movable clamp body, a pawl meshed with the ratchet wheel is arranged on the clamping handle, a release handle is further arranged on one side of the pawl, the clamping handle is operated in a rotating mode, the clamping handle drives the pawl to rotate in a single direction and is locked with the ratchet wheel in a single direction, and the release handle is operated to enable the pawl to be locked with the ratchet wheel in a release single direction.

Further, the pawl is rotationally fixed between the pair of side plate portions, the ratchet wheel is provided with ratchets distributed in an arc-shaped track, the clamping handle is rotated to drive the pawl to rotate relative to the ratchet wheel, and then the pawl is meshed with the ratchets distributed in the arc-shaped track and is locked in a one-way mode.

Further, the clamping handle is provided with a main body part for manual operation, side plate parts extending from the side surface of the main body part to one side, and a bottom support plate, the bottom support plate is connected between the opposite sides of the two side plate parts, the main body part, the side plate parts and the bottom support plate enclose a formed accommodating space, the pawl is accommodated and arranged in the accommodating space, the pawl comprises a release handle fixedly connected to the pawl and a fixed shaft arranged between the pawl and the release handle, and the release handle is elastically pressed by an elastic part to enable the pawl to be meshed with the ratchet wheel; pressing the release handle to overcome the biasing force of the elastomer, thereby disengaging the pawl from the ratchet.

Furthermore, the teeth of the movable chuck and the teeth of the gear part are both round teeth.

Furthermore, the movable chuck and the gear part are formed by punching, and the rack and the gear of the gear part are formed into a circular shape by punching.

According to the clamping tool, the gear moving along a circular track on the clamping handle and the rack of the teeth distributed along a straight line on the movable chuck are meshed with each other to enable the movable chuck to move linearly in the linear direction, so that the movable chuck and the fixed chuck clamp an object, and the movable chuck and the fixed chuck do not shake in the left-right direction in the clamping process.

Drawings

Fig. 1 is a perspective view of a clamping tool in a state of clamping an object according to a first embodiment of the present invention.

Fig. 2 is a view of fig. 1 viewed from another direction.

Fig. 3 is an exploded perspective view of the clamping tool in a state of clamping an object according to the first embodiment of the present invention.

Fig. 4 is a view of fig. 3 viewed from another direction.

Fig. 5 is an exploded perspective view showing the first embodiment of the present invention in a state where the object is released.

Fig. 6 is a perspective view of a clamping tool in a state of clamping an object according to a second embodiment of the present invention.

Fig. 7 is an exploded perspective view of the clamping tool in a state of clamping an object according to the second embodiment of the present invention.

Description of the main elements

Referring to the following reference numerals, the clamping tool 100/100 ', the sliding rod 1, the fixed clamp body 2, the pad 20, the fixed pin 21, the movable clamp body 3, the movable clamp head 31/31', the side lug 32, the movable hole 321/321 ', the rack 322, the clamp head positioning hole 30, the guide pin 33/33', the central fixing hole 34, the ratchet positioning hole 35, the clamping handle 4, the main body portion 41, the side plate portion 42, the first positioning hole 421, the second positioning hole 422, the retaining hole 423, the bottom support plate 43, the accommodating space 40, the reinforcement 44, the ratchet 5, the alignment hole 51, the pawl 6, the through hole 61, the fixing shaft 62, the release handle 7, the spring hole 71, the gear portion 8, the teeth 81, the retaining hole 82, and the retaining block 83.

The following specific embodiments will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or assembly must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the clamping tool in the prior art, the clamping handle is provided with a cam portion, the clamping handle is operated to enable the cam portion to extrude the movable chuck to clamp or enable the cam portion to separate from the movable chuck to loosen, and the cam portion can horizontally shift due to the shape and the motion track of the cam portion and is abutted to the movable chuck, so that the cam portion can shake in the left-right direction on one hand, and the surface integrity of a clamped object cannot be protected on the other hand. And the cam part of the clamping handle is an irregular cam line, so the molding precision is low in the die-casting process. In the application, the teeth 81 which are arranged on the clamping handle 4 and move along the circular track and the rack 322 arranged on the movable chuck 31 are meshed with each other to enable the movable chuck 31 to move linearly in the vertical direction, so that the movable chuck 31 and the fixed clamp body 2 can clamp objects, and the movable chuck 31 and the fixed clamp body 2 do not shake in the left-right direction in the clamping process.

Referring to fig. 1 to 5, fig. 1 to 4 are schematic views of the clamping tool 100 in a state of clamping an object, and fig. 5 is a view of the clamping tool in a state of releasing the object. The clamping tool 100 comprises a sliding rod 1, a fixed clamp body 2 fixed on the sliding rod 1 and a movable clamp body 3 slidably sleeved on the sliding rod 1. The fixed clamp body 2 and the movable clamp body 3 extend to the same side of the slide bar 1, so that the whole clamping tool 100 is in the shape of letter "F", and is called as an F-shaped clamp. When the clamping tool with the structure is used for clamping an object, the fixed clamp body 2 and the movable clamp head 31 are drawn close to the object and contacted with the object by sliding the movable clamp body 3, and then the clamping handle 4 is operated to enable the movable clamp head 31 to continuously clamp the object towards the direction of the fixed clamp body 2, so that the clamping function of the object can be realized. Specifically, the movable clamp body 3 is provided with a movable chuck 31 and a clamping handle 4 arranged on the movable clamp body 3. One side of the movable chuck 31 is provided with a rack 322 with a plurality of teeth distributed along a straight line, one side of the clamping handle 4 facing the sliding rod 1 is provided with a gear part 8 meshed with the rack 322 along an arc track, the gear part 8 is provided with teeth 81 meshed with the rack 322, and the tooth profile of the teeth 81 is a circular arc track. The clamping handle 4 is rotated and operated towards the direction of the sliding rod 1, and simultaneously the teeth 81 of the gear part 8 are driven to engage with the rack 322 along a circular track, so that the movable chuck 31 linearly moves along a linear direction to enable the movable chuck 31 to approach the fixed clamp body 2, and further, the object is clamped.

The fixed clamp body 2 and the sliding rod 1 are fixedly connected through a fixed pin 21, a cushion block 20 is arranged on one side, facing the movable chuck 31, of the fixed clamp body 2, and the cushion block 20 is used for protecting the surface of an object to be clamped and preventing the surface of the object from being scraped. Similarly, the movable chuck 31 described below may also be provided with a pad to protect the surface of the clamped object, which is not limited herein.

The movable chuck 31 is provided with a pair of side ears 32 located at two radial sides of the movable chuck body 3, and the pair of side ears 32 are provided with movable holes 321 and the racks 322. The movable hole 321 is disposed along the straight line direction in an elliptical shape. The movable jaw 31 is also provided with a central fixing hole 34. The rack 322 is disposed on the side of the side ear 32 close to the gear portion 8. The movable clamp body 3 further includes a clamp positioning hole 30, a guide pin 33 fixed to the clamp positioning hole 30, a central fixing hole 34 located outside the clamp positioning hole 30 and close to the clamping handle 4, and a pair of ratchet positioning holes 35 separately located below the central fixing hole 34. The movable hole 321 is sleeved on the guide pin 33, and the guide pin 33 can slide linearly relative to the movable hole 321, or the movable hole 321 floats in the linear direction relative to the guide pin 33, in other embodiments, the linear guide of the movable chuck 31 relative to the movable chuck body 3 can also adopt other sliding manners, such as a rectangular sliding block and a rectangular sliding groove, a hook and a slot, or a ball and a ball guide, and other sliding manners. The movable chuck 31 is floated in the vertical direction by the guiding interaction of the movable hole 321 and the positioning pin 33. In the first embodiment, the movable hole 321 is provided as one, and the guide pin 33 is provided as a pair in the linear direction, but not limited thereto. The chuck positioning holes 30 are arranged in a pair in the linear direction, and the pair of guide pins 33 can ensure that the movable holes 321 cannot rotate relative to the guide pins 33, so that the movable chuck 31 can slide in the linear direction and cannot shake in the left and right directions. In the first embodiment of the present invention, the guide pins 33 are provided as a pair in the linear direction, and in the second embodiment of the present invention, the guide pin top 33 'of the clamping tool 100' is provided as one in the linear direction, and the diameter of both ends of the guide pin 33 'is larger than that of the middle portion, so as to prevent the movable chuck 31' from falling, and the portions of both ends of the guide pin 33 'are externally buckled to the outside of the movable hole 321', so that the fixing effect of both is enhanced.

The grip handle 4 includes a main body 41 for manual operation, a pair of side plates 42 and a bottom support plate 43 extending from a side surface of the main body 41 to one side at an interval, and an accommodating space 40 defined by the main body 41, the side plates 42 and the bottom support plate 43. The pair of side plate portions 42 are sandwiched between both sides of the movable clip body 3, and the side plate portions 42 have thickness reinforcing regions (not shown) located on both sides of the movable clip body, and can reinforce the strength of the side plate portions 42. The reinforcing member 44 is a pin, and the movable clamp body 31, the side plate portion 42 and the gear portion 81 are provided with fixing holes corresponding to the reinforcing member 44, and are pivotally and fixedly connected with respect to the reinforcing member 44. Each side plate portion 42 further includes a first positioning hole 421 near one side of the movable chuck 31, a second positioning hole 422 far away from one side of the movable chuck 31 and located outside the first positioning hole 421, and a fastening hole 423 located between the first positioning hole 421 and the second positioning hole 422. The clamp handle 4 further includes a reinforcing member 44 passing through the first positioning holes 421 of the pair of side plate portions 42 and the central fixing hole 34 of the movable clamp body 3 to fix the clamp handle 4 and the movable clamp body 3. In this embodiment, the fixing hole of the movable chuck 31 is the central fixing hole 34, the fixing hole of the side plate 42 is the first positioning hole 421, and the fixing hole of the gear 81 is the holding hole 82 described below.

The movable clamp body 3 is provided with a ratchet wheel 5 with arc-shaped distributed ratchet teeth, the clamping handle 4 is provided with a pawl 6 meshed with the ratchet wheel 5, one side of the pawl 6 is also provided with a release handle 7, the release handle 7 is operated to enable the pawl 6 to be disengaged from the ratchet wheel 5, so that a user can be allowed to rotate the clamping handle 4, the teeth 81 are meshed with the rack 322 along a circular track and rotate reversely, and the movable clamp head 31 is further far away from the fixed clamp body 2.

The movable clamp body 3 is further provided with the ratchet wheel positioning hole 35, the ratchet wheel 5 is provided with an alignment hole 51 arranged opposite to the ratchet wheel positioning hole 35, the ratchet wheel 5 is positioned on the movable clamp body 3 and fixed to the ratchet wheel positioning hole 35 and the alignment hole 51 through a pin (not shown), and the pawl 6 is rotatably connected between the pair of side plate portions 42.

The pawl 6 is located in the accommodating space 40, the pawl 6 includes the release handle 7 fixedly connected to the outer side of the pawl 6, a through hole 61 located on the inner side of the pawl 6, and a fixing shaft 62 passing through the through hole 61 and the second positioning hole 422 to fix the clamping handle 4 and the pawl 6, and the pawl 6 can rotate relative to the fixing shaft 62 and further can be locked with the ratchet wheel 5 with arc-shaped ratchet teeth in a unidirectional mode. The release handle 7 is normally elastically pressed by a spring member, and thus can be stably pressed against the holding position of the accommodating space 40 and exposed outside the clamping handle 4 for manual operation. Specifically, the release handle 7 is provided with a spring hole 71, the spring hole 71 receives an external spring (not shown) and fixes one end of the spring, and the other end of the spring (not shown) abuts against the bottom support plate 43, so that the release handle 7 is normally exposed to the accommodating space 40. When the rotation position locking of the clamping handle 4 needs to be released, the unidirectional locking of the pawl 6 and the ratchet wheel 5 can be released by pressing the release handle 7, so that the rotation position locking of the clamping handle 4 can be released, the clamping handle 4 can rotate reversely conveniently, the release handle 7 is loosened, and the pawl 6 and the ratchet wheel 5 recover the unidirectional locking function. One side of the main body part 41 of the clamping handle 4 for manual operation is arranged in a wave sawtooth shape, so that the clamping handle is convenient for the manual grasping.

The gear portions 8 are fixedly provided on both sides of the pair of side plate portions 42 of the clamp handle 4, and the clamp tool 100 includes the pair of gear portions 8, and the pair of gear portions 8 are symmetrically provided on both sides of the movable clamp body 3. The gear portion 8 has the teeth 81 engaged with the rack 322, and a holding hole 82 communicating with the central fixing hole 34 and the first positioning hole 421, and the reinforcing member 44 passes through the central fixing hole 34, the first positioning hole 421 and the holding hole 82 to position the movable clamp body 3, the clamping handle 4 and the gear portion 8, that is, in the present embodiment, specifically, the outer end of the reinforcing member 44 is rotatably fixed to the gear portion 8. The gear portion 8 further includes a pair of holding blocks 83 protruding in the radial direction outside the holding hole 82, in this application, the gear portion 8 is disposed in a pair, that is, the pair of holding blocks 83 are disposed opposite to each other, and the holding blocks 83 are held in the holding hole 423 to fix the gear portion 8 and the grip handle 4.

When the gripping tool 100 has not gripped an object, the state thereof is as shown in fig. 5, and when the gripping tool 100 has gripped an object, the state thereof is as shown in fig. 1 to 4. When the clamping tool 100 clamps an object, the main body 41 of the clamping handle 4 is operated, and at this time, the pawl 6 fixed to the clamping handle 4 by the fixing shaft 62 starts to engage with the ratchet wheel 5, and the gear portion 8 fixed to the clamping handle 4 by the reinforcing member 44 passing through the retaining hole 82 and the first positioning hole 421 and the holding block 83 being held in the holding hole 423 starts to engage with the rack 322. The engagement is such that, as the clamping handle 4 is rotated toward the sliding rod 1, the pawl 6 is engaged from top to bottom along the outer side of the ratchet wheel 5 and reaches the inner end of the ratchet wheel 5, and at the same time, the teeth 81 of the gear portion 8 are engaged with the rack 322 along a circular track, thereby driving the movable chuck 31 having the rack 322 to move from bottom to top in the vertical direction to approach the fixed clamp body 2, thereby holding the object in a proper position. When an object needs to be released, the clamping handle 4 is operated to be pulled back from bottom to top by operating the release handle 7, so that the pawl 6 returns to the outer end of the ratchet wheel 5, and meanwhile, the clamping handle 4 is operated to rotate in the direction departing from the sliding rod 1 and drive the teeth 81 of the gear part 8 to be meshed with the rack 322 along a circular track from bottom to top. The movable jaw 31 moves from the top down to be away from the fixed jaw body 2, thereby releasing the object.

In the invention, the teeth 81 are meshed with the rack 322 along a circular track to further drive the movable chuck 31 to linearly move in the vertical direction, and in the invention, the teeth 81 and the rack 322 are arranged on both sides of the movable chuck body 3, so that the meshing structure is stable, the movable chuck 31 linearly moves in the vertical direction, the clamping shaking in the left-right direction does not exist, the clamping track is linear, the clamping position is stable, and the integrity of the clamping surface of the clamped object is favorably maintained. Meanwhile, the rack 322 and the teeth 81 are customized round teeth, are meshed by circular arc tracks, are meshed stably, and meanwhile, the movable chuck 31 and the round teeth of the gear part 8 are conveniently formed by punching, have larger tooth shapes, so the forming precision is higher, and the cost is relatively lower.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

The above description is only a part of the embodiments of the present invention, and not all embodiments, and any equivalent variations of the technical solutions of the present invention, which are made by those skilled in the art through reading the present specification, are covered by the claims of the present invention.

Claims

1. The utility model provides a clamping tool, includes the slide bar, is fixed in the fixed clamp body, the slip cap of slide bar are located the activity clamp body of slide bar, clamping tool still including slide set up in activity chuck and the rotatory fixed setting on the activity clamp body in the tight handle of clamp of activity clamp body, its characterized in that: one side of the movable chuck is provided with a rack with a plurality of teeth distributed along a straight line, one side of the clamping handle, facing the sliding rod, is provided with a plurality of teeth distributed along a circular track and is meshed with the gear part of the rack, the clamping handle is operated to enable the clamping handle to rotate relative to the movable chuck and drive the gear part and the rack to be meshed for transmission, so that the movable chuck moves along the straight line direction relative to the movable chuck, and the movable chuck moves close to or far away from the fixed chuck.

2. The clamping tool of claim 1, wherein: the movable chuck is provided with a pair of side lugs which are respectively positioned at two sides of the movable clamp body, each side lug is provided with the rack, the clamping handle comprises a pair of side plate parts which are respectively positioned at two sides of the movable clamp body, each side plate part is fixedly positioned with the gear parts, the gear parts are symmetrically arranged at two sides of the movable clamp body, and the gear parts are meshed with the corresponding racks.

3. The clamping tool of claim 2, wherein: each side ear is provided with a movable hole, the movable clamp body is further provided with a guide pin corresponding to the movable hole, the guide pin is sleeved in the movable hole, and the guide pin and the movable clamp body are in sliding fit along the linear direction.

4. The clamping tool of claim 3, wherein: the movable hole is along the oval setting of rectilinear direction, and sets up to one, the uide pin sets up to be in the ascending a pair of or one of rectilinear direction.

5. The clamping tool of claim 4, wherein: the clamping handle further comprises a reinforcing piece which penetrates through the side plate parts and the movable clamp body to fix the clamping handle to the movable clamp body in a rotating mode, the gear parts are fixedly arranged on two sides of the pair of side plate parts of the clamping handle, and the outer end of the reinforcing piece is rotationally fixed to the gear parts.

6. The clamping tool of claim 5, wherein: the reinforcing piece is a pin, and the movable clamp body, the side plate part and the gear part are provided with fixing holes corresponding to the reinforcing piece.

7. The clamping tool of claim 6, wherein: the side plate part of the clamping handle is provided with a buckling hole, the gear part extends towards the side plate part to form a clamping block, and the clamping block is clamped in the buckling hole.

8. The clamping tool of claim 1, wherein: the movable clamp body is provided with a ratchet wheel, the clamping handle is provided with a pawl meshed with the ratchet wheel, one side of the pawl is further provided with a release handle, the clamping handle is operated in a rotating mode, the clamping handle drives the pawl to rotate in a single direction and is locked with the ratchet wheel in a single direction, and the release handle is operated to enable the pawl to be locked with the ratchet wheel in a release single direction.

9. The clamping tool of claim 8, wherein: the pawl is rotationally fixed between the pair of side plate parts, the ratchet wheel is provided with ratchets distributed in an arc-shaped track, the clamping handle is rotated to drive the pawl to rotate relative to the ratchet wheel, and then the pawl is meshed with the ratchets distributed in the arc-shaped track and is locked in a one-way mode.

10. The clamping tool of claim 9, wherein: the clamping handle is provided with a main body part for manual operation, side plate parts extending from the side surface of the main body part to one side, and a bottom supporting plate, the bottom supporting plate is connected between the opposite sides of the two side plate parts, the main body part, the side plate parts and the bottom supporting plate enclose a formed accommodating space, the pawl is accommodated and arranged in the accommodating space, the pawl comprises a release handle fixedly connected to the pawl and a fixed shaft arranged between the pawl and the release handle, and the release handle is elastically pressed by an elastic part so that the pawl is meshed with the ratchet wheel; pressing the release handle to overcome the biasing force of the elastomer, thereby disengaging the pawl from the ratchet.

11. The clamping tool of claim 1, wherein: the teeth of the movable chuck and the teeth of the gear part are both round teeth.

12. The clamping tool of claim 11, wherein: the movable chuck and the gear part are formed by punching, and the rack and the gear of the gear part are punched and formed into a circle.