CN215148399U - Clamp holder suitable for clamping bulge workpiece and machining equipment - Google Patents

Abstract

The clamp holder is suitable for clamping a bulge workpiece and comprises an upper clamp holder and a lower clamp holder which can be butted up and down; the fixture is characterized in that a concave avoidance space is arranged on a clamping working surface of the lower clamping seat and used for receiving a bulge of a bulge workpiece and forming front and back symmetrical supports for the bulge workpiece by utilizing clamping working surfaces positioned on the front side and the back side of the concave avoidance space; the lower clamping seat is further provided with a front positioning wall and a rear moving arm, the front positioning wall and the rear moving arm are respectively arranged on the front side and the rear side of the lower concave avoidance space, at least the top end portion of the rear moving arm can move back and forth relative to the front positioning wall, the front positioning wall is used for positioning the bulge workpiece in the front direction, and the rear moving arm is used for at least utilizing the top end portion of the rear moving arm to press the bulge of the bulge workpiece in the front and rear directions to be matched with the front positioning wall to clamp the bulge workpiece when the bulge workpiece is clamped between the upper clamping seat and the lower clamping seat.

Description

Clamp holder suitable for clamping bulge workpiece and machining equipment

Technical Field

The invention relates to a clamping device, in particular to a clamp suitable for clamping a bulge workpiece. The invention also relates to a machining device provided with the clamp holder.

Background

Before mechanical processing such as cutting and punching, a workpiece needs to be positioned by a positioning device. Different positioning devices are required to be configured for workpieces with different structural characteristics, for example, a positioning device for chamfering a plastic winding core disclosed in patent CN201922493198.2 includes: clamping device and locating component, clamping device includes the base station, is located the rubber block of base station top and be used for the drive the cylinder of rubber block lift removal. The base station is provided with a V-shaped groove and a square through groove positioned below the V-shaped groove. The positioning assembly comprises a square pipe capable of sliding in the square through groove, a positioning column installed on the square pipe and a locking screw for locking and positioning the square pipe. In the processing process, firstly, the plastic winding core placed on the V-shaped groove is pushed to abut against the positioning column for axial positioning, then the rubber block is driven by the air cylinder to press and clamp the plastic winding core, finally, the locking screw is unscrewed, and the positioning column and the square pipe are taken down and then the plastic winding core is cut. In the cutting process, the workpiece is axially positioned mainly by means of the friction resistance between the workpiece and the rubber block and between the workpiece and the V-shaped groove, the larger the upper clamping force and the lower clamping force between the rubber block and the V-shaped groove, the larger the friction resistance is, the more stable the axial positioning of the workpiece is, but if the upper clamping force and the lower clamping force are too large, the workpiece with a thin-wall structure is contracted and deformed, and if the upper clamping force and the lower clamping force are not enough, the axial positioning of the workpiece is unstable. In addition, the bulge workpiece is a special-shaped workpiece and comprises a main shaft extending axially forwards and backwards and a bulge protruding out of the outer peripheral wall of the main shaft in the radial direction, wherein the shape of the bulge can be various, such as annular and semi-annular. When the positioning device is used for positioning the bulge workpiece, the bulge is required to be suspended outside the V-shaped groove, and if the upper clamping force and the lower clamping force are insufficient, the end part of the bulge workpiece is easy to warp to damage the machining precision.

Disclosure of Invention

Based on the above analysis, the positioning device disclosed in CN201922493198.2 is not suitable for clamping and positioning the bulge workpiece, and a suitable positioning and clamping mechanism is additionally provided. The invention aims to stably clamp and position the bulge workpiece on the basis of reducing the damage degree of the clamping force to the bulge workpiece.

In view of the above, the present invention provides a gripper suitable for gripping a bulging workpiece, the gripper comprising an upper holder and a lower holder capable of being butted up and down, the upper holder and the lower holder being used for forming gripping and positioning of the bulging workpiece in up and down directions when the upper holder and the lower holder are butted up and down; the fixture is characterized in that a concave avoidance space is arranged on the clamping working surface of the lower clamping seat, and the concave avoidance space is used for receiving a bulge of a bulge workpiece and forming front-back symmetrical supports for the bulge workpiece by utilizing the clamping working surfaces positioned at the front side and the back side of the concave avoidance space; the lower clamping seat is further provided with a front positioning wall and a rear movable arm, the front positioning wall and the rear movable arm are respectively arranged on the front side and the rear side of the concave avoidance space, at least the top end portion of the rear movable arm can move back and forth relative to the front positioning wall, the front positioning wall is used for positioning the bulge workpiece in the front direction, and the rear movable arm is used for at least utilizing the top end portion of the rear movable arm to press the bulge of the bulge workpiece in the front and rear directions when the bulge workpiece is clamped between the upper clamping seat and the lower clamping seat so as to be matched with the front positioning wall to clamp the bulge workpiece.

The upper clamping seat and the lower clamping seat are seat bodies capable of moving up and down relatively, when the upper clamping seat and the lower clamping seat are butted together up and down, the bulge workpiece can be clamped from the up and down direction, and after the upper clamping seat and the lower clamping seat are separated, the up and down clamping and positioning effects on the bulge workpiece can be relieved.

The concave avoidance space is an accommodating space extending towards the lower part of the clamping working surface of the lower clamping seat, and the front side and the rear side of the concave avoidance space are provided with the clamping working surfaces. In one application, a pit is arranged on a clamping working surface of the lower clamping seat, the pit is provided with a left side wall, a right side wall and a bottom wall, and a pit inner cavity of the pit forms the concave avoidance space; or a window part is arranged on the clamping working surface of the lower clamping seat, and the upper and lower through spaces defined by the window part form the concave avoidance space. If the front and the back of the bulge workpiece extend with the main shafts, after the bulge workpiece is placed on the clamping working surface of the lower clamping seat and the bulge is sunk into the concave avoidance space, the main shafts positioned in front of and behind the bulge are respectively placed on the clamping working surfaces at the front and the back of the concave avoidance space, and the bulge workpiece is stably supported.

The front positioning wall and the rear movable arm are respectively arranged at the front side and the rear side of the concave avoidance space, the rear movable arm is defined to be positioned behind the front positioning wall, the rear movable arm is in a natural state under the condition that an expansion workpiece is not clamped, and the top end part of the rear movable arm possibly enters or does not enter the concave avoidance space when viewed from top to bottom, and the front positioning wall and the rear movable arm are arranged in an adaptive mode according to the expansion structure of the expansion workpiece and the front clamping force and the rear clamping force which need to be configured.

Wherein at least the top end of the rear movable arm can move back and forth relative to the front positioning wall, and the above-mentioned characteristics imply a feasible technical solution comprising: only the top end part of the rear movable arm moves back and forth relative to the front positioning wall, while the tail end part of the rear movable arm does not move back and forth relative to the front positioning wall, for example, the tail end part of the rear movable arm is hinged on the lower clamping seat and can only rotate at a fixed point; or the whole rear movable arm moves back and forth relative to the front positioning wall, for example, the rear movable arm is arranged on the lower clamping seat in a back and forth sliding manner. Of course, other technical solutions are also possible, and are not listed.

When the rear movable arm clamps the bulge workpiece at least by utilizing the matching of the top end part of the rear movable arm and the front positioning wall, so as to clamp and position the bulge workpiece front and back, the bulge or other characteristic bodies positioned in front of the bulge is abutted against the front positioning wall, the clamping force in the front and back direction acts on the bulge, and a rear clamping force point is formed on the bulge.

Compared with the prior art, the invention has the beneficial technical effects that: firstly, the clamp holder can not only form upper and lower clamping positioning on the bulging workpiece through the upper and lower clamping seats, but also form front and rear clamping positioning on the bulging workpiece through the front positioning wall and the rear movable arm, namely, the clamp holder can carry out dual positioning clamping on the bulging workpiece from two different directions, so that the positioning precision of the clamp holder on the bulging workpiece is improved, and the upper and lower clamping forces do not need to be increased for preventing the bulging workpiece from moving back and forth, so that the damage to the bulging workpiece can be reduced. Secondly, because the front and back clamping working faces of the concave avoidance space can support the bulge workpiece in a front-back symmetrical manner, the clamp holder can stably support the bulge workpiece, and the up-and-down tilting of the bulge workpiece in the machining process is reduced. Thirdly, since the bulge of the bulge workpiece is used for forming the rear clamping force point, namely, a characteristic body extending to the rear of the bulge on the bulge workpiece is not required to be used as the rear clamping force point, the application of the clamp is not limited by the total length of the bulge workpiece, and the application range is wide.

The following are various improvements to the holder proposed by the present invention, and the following improvements can be applied to an embodiment alone or in combination.

The further technical scheme can also be that a pair of rear moving arms is arranged, and the pair of rear moving arms are arranged at intervals from left to right. Thus, the pair of rear movable arms can press the bulge of the bulge workpiece from the left side and the right side of the bulge workpiece, and the stability of the front clamping force and the rear clamping force is further improved.

According to a further technical scheme, the clamping working surface of the lower clamping seat extends to the rear of the rear movable arm from top to bottom. Therefore, the supporting area of the lower clamping seat to the bulge workpiece is increased, and the bulge workpiece is positioned more stably.

The clamping working face of the lower clamping seat comprises a pair of clamping wall faces which respectively have a front-back extension length and are arranged on the left side and the right side, when viewed from back to front, the pair of clamping wall faces are oppositely arranged in an inclined mode and define a workpiece positioning space in a horn shape with a large upper part and a small lower part, and the pair of clamping wall faces can cooperatively support a bulge workpiece and limit the position of the central axis of the bulge workpiece; the concave avoidance space is at least arranged on the pair of clamping wall surfaces. Wherein the recessed avoidance space may be partially or entirely provided on the pair of the sandwiching wall surfaces.

The further technical scheme can also be that a gap is arranged on the rear side wall of the lower clamping seat and communicated with the workpiece positioning space. In this way, the non-bulging portion of the drum member held on the holder can extend out of the holder by means of the notch to facilitate post-processing.

Further technical solution may also be that the front positioning wall is adjustable in position back and forth. Therefore, the size of the front clamping space and the size of the rear clamping space between the front positioning wall and the rear movable arm can be adjusted conveniently, so that the clamp can be adapted to bulge workpieces with various dimensions, and the application range of the clamp is expanded. After the front and rear positions of the front positioning wall are determined, the front positioning wall does not move in the process of clamping and positioning the bulge workpiece in the front and rear directions.

The technical scheme can be that the lower clamp seat is also provided with an arm mounting seat, and the tail end part of the rear movable arm is hinged to the arm mounting seat through a shaft body; the device also comprises a driver acting on the rear movable arm, wherein the driver is used for providing forward jacking moment to the top end part of the rear movable arm so as to be capable of jacking the bulge of the bulge workpiece; the limiting device is arranged between the top end of the rear movable arm and the arm mounting seat and used for limiting the amplitude of the rear movable arm swinging backwards around the shaft body. The driver can be a cylinder, a motor, a spring and the like, and the limiter can be a bolt, a soft connecting belt and the like.

The technical scheme can also be that the limiter is a bolt, the driver is a compression spring, and the compression spring is sleeved on the bolt. In this way, the connection between the top end portion of the rear movable arm and the arm mounting seat can be conveniently realized by using the connection function of the bolt itself, and the compression spring can be conveniently positioned by using the bolt, thereby simplifying the positioning structure of the compression spring. In one application, an optical hole is formed in the arm mounting seat, a screw rod of the bolt penetrates through the optical hole to be in threaded connection with the top end portion of the rear movable arm, or an optical hole is formed in the top end portion of the rear movable arm, and the screw rod of the bolt penetrates through the optical hole to be in threaded connection with the arm mounting seat, so that when the top end portion of the rear movable arm swings back and forth, the screw rod of the bolt moves back and forth in the optical hole and limits the amplitude of backward swinging of the rear movable arm around the shaft body.

Further, according to the technical scheme, the arm mounting seat can be adjusted in position in the front-back direction, so that the position of the rear movable arm in the front-back direction can be adjusted. Therefore, the size of the front clamping space and the size of the rear clamping space between the front positioning wall and the rear movable arm can be adjusted conveniently, so that the clamp can be adapted to bulge workpieces with various dimensions, and the application range of the clamp is expanded.

In addition, the invention also provides machining equipment provided with the clamp holder, and the machining equipment further comprises a clamp driver for driving the clamp holder to act, wherein the clamp driver comprises an upper mounting arm, a lower mounting arm and a power device, the upper clamp holder is mounted on the upper mounting arm, the lower clamp holder is mounted on the lower mounting arm, and the power device can drive the upper clamp holder and the lower clamp holder to be in butt joint or separated up and down through the upper mounting arm and the lower mounting arm.

Due to the characteristics and advantages, the invention can be applied to the clamper suitable for clamping the bulge workpiece and the machining equipment.

Drawings

FIG. 1 is a schematic perspective view of a bulging piece of one type suitable for use in the holder of the present invention;

FIG. 2 is a schematic perspective view of a holder to which the present invention is applied;

FIG. 3 is a perspective view of the lower clamp assembly;

FIG. 4 is a schematic top view (from top to bottom) of the lower clamp assembly;

FIG. 5 is a schematic front view (from rear to front) of the lower clamp assembly;

FIG. 6 is a schematic sectional view taken along line A-A in FIG. 5;

FIG. 7 is an exploded view of the lower clamp assembly.

Detailed Description

The following describes the structure of a clamp and a machining device suitable for clamping a bulge workpiece, applying the technical scheme of the invention, with reference to the accompanying drawings.

As shown in fig. 1, a perspective view of a bulging workpiece 1 is shown, the bulging workpiece 1 includes a main shaft 10 extending forward and backward and a bulge 11 protruding radially from an outer periphery of the main shaft 10, wherein the main shaft 10 includes a front main shaft 101 and a rear main shaft 102 extending forward and backward of the bulge 11, respectively. In order to facilitate cutting of the tail portion of the spindle 10, the bulging workpiece 1 needs to be clamped and positioned in advance, in view of the present invention, a gripper 200 suitable for gripping bulging workpieces is provided, the gripper 200 is suitable for gripping multiple types of bulging workpieces, and for convenience of discussion, the structure of the gripper 200 is described in detail with the bulging workpiece 1 as a gripping object.

As shown in fig. 2 to 7, the clamp 200 includes an upper clamp base 2 and a mounting base 21, which are vertically separated, and 4 lower clamp assemblies 300 are mounted on the mounting base 21, so that one clamp 200 can simultaneously clamp four bulging workpieces. The lower clamp assembly 300 comprises a lower clamp holder 3, and the upper clamp holder 2 and the lower clamp holder 3 are used for clamping and positioning the bulge workpiece 1 in the up-down direction when the upper clamp holder 2 and the lower clamp holder 3 are in up-down butt joint. A through-hole-shaped concave avoidance space 32 is provided on the clamping working surface 31 of the lower clamping seat 3 (in other embodiments, the concave avoidance space 32 may also be a blind hole), and the concave avoidance space 32 is used for receiving the bulge 11 of the bulge workpiece 1 and forming a front-back symmetrical support for the bulge workpiece 1 by using the front clamping working surface 31a and the rear clamping working surface 31b on the front side and the rear side of the concave avoidance space 32. Thus, when the bulging workpiece 1 is placed on the clamping working surface 31 of the lower clamping seat 3 and the bulging 11 is partially sunk into the concave avoidance space 32, the front spindle 101 and the rear spindle 102 will be respectively placed on the front clamping working surface 31a and the rear clamping working surface 31b of the concave avoidance space 32, and at this time, the bulging workpiece 1 is stably supported.

The lower clamping seat 3 is further provided with a front positioning wall 5 and a rear movable arm 4, the front positioning wall 5 and the rear movable arm 4 are respectively arranged at the front side and the rear side of the concave avoidance space 32, and the front positioning wall 5 is used for positioning the bulging workpiece 1 in the front direction. The front positioning wall 5 and the lower clamping seat 3 are of a split structure, the front positioning wall 5 is provided with a long hole 51 extending forwards and backwards, and a fastener penetrates through the long hole 51 to mount the front positioning wall 5 on the lower clamping seat 3. The front and rear positions of the front positioning wall 5 can be adjusted by loosening the fastener. Therefore, the size of the front and rear clamping space between the front positioning wall 5 and the rear movable arm 4 can be adjusted conveniently, so that the clamp 200 is suitable for bulge workpieces with various dimensions, and the application range of the clamp 200 is expanded. However, after the front and rear positions of the front positioning wall 5 are determined, the front positioning wall 5 does not move in the process of clamping and positioning the bulging workpiece 1 in the front and rear directions. Of course, in other embodiments, the front positioning wall 5 may be formed integrally with the lower holder 3 so as not to be adjustable in position.

And a left clamping arm assembly 400a and a right clamping arm assembly 400 which are arranged left and right are arranged on the lower clamping seat 3. They have a symmetrical configuration and will be described below with reference to right clamp arm assembly 400. The right clamp arm assembly 400 includes an arm mounting base 41 and a rear movable arm 4. The arm mounting base 41 is mounted on the lower clamp base 3, and the rear end of the rear movable arm 4 is hinged to the arm mounting base 41 through a shaft body 43. The device also comprises an actuator 45 acting on the rear movable arm 4, wherein the actuator 45 is used for providing a forward pressing moment to the top end part 40 of the rear movable arm 4 so as to press the bulge 11 of the bulge workpiece 1; a stopper 42 is further included, the stopper 42 being disposed between the tip end portion 40 of the rear movable arm 4 and the arm mount 41, the stopper 42 being configured to limit the amplitude of rearward swinging of the rear movable arm 4 about the shaft body 43. In this embodiment, the stopper 42 is a screw 42, and the driver 45 is a compression spring 45. An unthreaded hole 410 is formed in the arm mounting base 41, a threaded hole is formed in the rear movable arm 4, and a screw 421 of the bolt 42 is threaded into the threaded hole in the rear movable arm 4 after passing through the unthreaded hole 410. A pair of first flat washer 44 and a second flat washer 44a which are arranged in a front-back manner are further arranged on the screw 421 of the bolt 42, and the compression spring 45 is sleeved on the bolt 42 and is positioned between the first flat washer 44 and the second flat washer 44 a. The head end of the compression spring 45 presses the cap 422 of the bolt 42 through the first flat washer 44, and the tail end of the compression spring 45 presses the arm mounting base 41 through the second flat washer 44 a. The rear movable arm 4 can swing back and forth around the shaft body 43, so that the tip end portion 40 of the rear movable arm 4 can move back and forth with respect to the front positioning wall 5. The rear movable arm 4 is configured to be able to press the bulge 11 of the bulge workpiece 1 in the front-rear direction by using a top end portion 40 of the rear movable arm 4 before the bulge workpiece 1 is clamped between the upper holder 2 and the lower holder 3, and further clamp the bulge workpiece 1 in cooperation with the front positioning wall 5. In the case that the bulging workpiece is not clamped, the rear movable arm 4 is in a natural state, and when viewed from the top, the top end portion 40 of the rear movable arm 4 enters the concave-shaped avoidance space 32, but of course, the top end portion 40 of the rear movable arm 4 may be located outside the concave-shaped avoidance space 32, and is configured to adapt to the bulging structure of the bulging workpiece and the front and rear clamping forces to be configured. In other embodiments, the compression spring 45 may not be inserted into the bolt 42, but may be pressed between the arm mounting seat 41 and the rear movable arm 4; still alternatively, the actuator may be a cylinder, a motor, or the like capable of providing a moment pressing forward against the tip end portion 40 of the rearward movable arm 4, and the stopper may be a flexible connecting strap or the like disposed between the tip end portion 40 of the rearward movable arm 4 and the arm attachment seat 41 without hindering the tip end portion 40 of the rearward movable arm 4 from pressing forward against the bulge 11 of the bulge workpiece 1; alternatively, the rear movable arm 4 may be configured to be integrally slidably provided on the rear movable arm 4 without adopting the swing structure, so that the entire rear movable arm 4 can be moved back and forth with respect to the front positioning wall 5, and in addition to this, the rear movable arm 4 may be configured to have another connecting structure as long as at least the distal end portion 40 of the rear movable arm 4 can be moved back and forth with respect to the front positioning wall 5. Further, the arm mount 41 can be adjusted in position back and forth to adjust the position of the rear movable arm 4 in the back and forth direction. In addition, according to the above technical solution, the rear movable arm 4a of the left clamp arm assembly 400a and the rear movable arm 4 of the right clamp arm assembly 400 are arranged at a left-right interval. Thus, the bulge 11 can be pressed from the left and right sides of the bulge workpiece 1, and the stability of the front and rear clamping force is further improved.

Compared with the prior art, the invention has the beneficial technical effects that: firstly, the clamp 200 can not only form upper and lower clamping positions on the bulging workpiece 1 through the upper clamp holder 2 and the lower clamp holder 3, but also form front and rear clamping positions on the bulging workpiece 1 through the front positioning wall 5 and the rear movable arm 4, that is, the clamp 200 can perform double positioning clamping on the bulging workpiece 1 from two different directions, so that the positioning accuracy of the clamp 200 on the bulging workpiece 1 is improved, and the upper and lower clamping forces do not need to be increased for preventing the bulging workpiece 1 from moving back and forth, so that the damage to the bulging workpiece 1 in the clamping process can be reduced. Secondly, the front clamping working surface 31a and the rear clamping working surface 31b on the front side and the rear side of the concave avoidance space 32 form front-rear symmetrical supports for the bulging workpiece 1, so that the clamp 200 can stably support the bulging workpiece 1, and the up-down tilting of the bulging workpiece 1 in the machining process is reduced. Thirdly, since the bulge 11 of the bulge workpiece 1 is used to form a rear clamping force point, i.e. a feature extending to the rear of the bulge 11 on the bulge workpiece 1 is not required to be used as the rear clamping force point, the application of the clamp 200 is not limited by the total length of the bulge workpiece 1, and the application range is wide.

The clamping face 31 of the lower clamping shoe 3 extends behind the rear movable arm 4, seen from above (the resulting view is fig. 4). Therefore, the supporting area of the lower clamping seat 3 for the bulging workpiece 1 is increased, and the bulging workpiece 1 is positioned more stably. The clamping face 31 of the lower holder 3 includes a pair of left and right clamping walls 311 and 312 extending forward and backward and spaced apart from each other in the left-right direction, and a bottom clamping wall 313 connected between the left and right clamping walls 311 and 312. The left and right holding wall surfaces 311 and 312 are arranged obliquely with respect to each other and define a workpiece positioning space 33 having a trumpet shape with a large top and a small bottom, as viewed from the rear to the front (the resulting view is fig. 5), and the left and right holding wall surfaces 311 and 312 can cooperatively hold one of the bulging workpieces 1 and define the position of the central axis of the bulging workpiece 1. The recessed escape space 32 is provided on the left clamp wall surface 311, the right clamp wall surface 312, and the bottom clamp wall surface 313. Of course, in another embodiment, the bottom clamping wall surface 313 may be omitted and the left and right clamping wall surfaces 311 and 312 may be directly connected together, and in this case, the recessed avoidance space 32 may be provided on the left and right clamping wall surfaces 311 and 312. Further, a notch 34 is formed in the rear side wall of the lower clamp holder 3, and the notch 34 is communicated with the workpiece positioning space 33. In this way, the rear main shaft 102 of the bulging workpiece 1, i.e., the non-bulging portion, can be extended out of the clamper 200 through the notch 34, thereby facilitating the post-process machining.

In addition, the present invention further provides a machining device (not shown) equipped with the holder 200, further comprising a holding driver for driving the holder 200 to operate, wherein the holding driver comprises an upper mounting arm, a lower mounting arm and a power device, the upper holder 2 is mounted on the upper mounting arm, the lower holder 3 is mounted on the lower mounting arm, and the power device can drive the upper holder 2 and the lower holder 3 to be in up-and-down butt joint or separated through the upper mounting arm and the lower mounting arm. The working process is as follows: the power device drives the upper clamping seat 2 to move upwards to leave the lower clamping seat 3 through the upper mounting arm; then, the bulging workpiece 1 is placed on the clamping working surface 31 of the lower clamping seat 3, and the bulging workpiece 1 is clamped in the front and back directions by the front positioning wall 5, the top end part 40a of the rear movable arm 4a and the top end part 40 of the rear movable arm 4; and finally, the power device drives the upper clamping seat 2 to move downwards through the upper mounting arm to be in butt joint with the lower clamping seat 3 to clamp the bulge workpiece 1 up and down.

Claims (10)

1. The clamp holder is suitable for clamping a bulging workpiece and comprises an upper clamp seat and a lower clamp seat which can be butted up and down, and the upper clamp seat and the lower clamp seat are used for clamping and positioning the bulging workpiece in the up-and-down direction when the upper clamp seat and the lower clamp seat are butted up and down; the fixture is characterized in that a concave avoidance space is arranged on the clamping working surface of the lower clamping seat, and the concave avoidance space is used for receiving a bulge of a bulge workpiece and forming front-back symmetrical supports for the bulge workpiece by utilizing the clamping working surfaces positioned at the front side and the back side of the concave avoidance space; the lower clamping seat is further provided with a front positioning wall and a rear movable arm, the front positioning wall and the rear movable arm are respectively arranged on the front side and the rear side of the concave avoidance space, at least the top end portion of the rear movable arm can move back and forth relative to the front positioning wall, the front positioning wall is used for positioning the bulge workpiece in the front direction, and the rear movable arm is used for at least utilizing the top end portion of the rear movable arm to press the bulge of the bulge workpiece in the front and rear directions when the bulge workpiece is clamped between the upper clamping seat and the lower clamping seat so as to be matched with the front positioning wall to clamp the bulge workpiece.

2. The clamp adapted to clamp a bulging workpiece according to claim 1, wherein a pair of the rear moving arms are provided, the pair of rear moving arms being arranged at a left-right interval.

3. The clamp adapted to clamp a bulging workpiece according to claim 1, wherein a clamping face of the lower clamp base extends rearward of the rear movable arm, as viewed from above.

4. The clamp suitable for clamping the bulging workpiece according to claim 1, wherein the clamping face of the lower clamp seat comprises a pair of clamping wall faces respectively having a front-back extension length and being arranged on the left and right sides, the pair of clamping wall faces being arranged in an opposite inclined manner and defining a workpiece positioning space in a shape of a trumpet with a large upper part and a small lower part when viewed from the back to the front, the pair of clamping wall faces being capable of cooperatively supporting one bulging workpiece and defining the position of the central axis of the bulging workpiece; the concave avoidance space is at least arranged on the pair of clamping wall surfaces.

5. The clamp suitable for clamping the bulge workpiece as claimed in claim 4, wherein a notch is arranged on the rear side wall of the lower clamp seat, and the notch is communicated with the workpiece positioning space.

6. The clamp adapted to clamp a bulging workpiece according to claim 1, wherein the front positioning wall is adjustable back and forth in position.

7. The clamp suitable for clamping the bulging workpiece according to any one of claims 1 to 6, wherein an arm mounting seat is further mounted on the lower clamp seat, and the tail end part of the rear movable arm is hinged to the arm mounting seat through a shaft body; the device also comprises a driver acting on the rear movable arm, wherein the driver is used for providing forward jacking moment to the top end part of the rear movable arm so as to be capable of jacking the bulge of the bulge workpiece; the limiting device is arranged between the top end of the rear movable arm and the arm mounting seat and used for limiting the amplitude of the rear movable arm swinging backwards around the shaft body.

8. The clamp adapted to clamp the bulging workpiece of claim 7, wherein the stopper is a bolt, and the actuator is a compression spring fitted over the bolt.

9. The clamp adapted to clamp a bulging workpiece according to claim 7, wherein the arm mount is adjustable in position back and forth to adjust the position of the rear movable arm in the back and forth direction.

10. The machining equipment provided with the clamp holder according to any one of claims 1 to 9, further comprising a clamp driver for driving the clamp holder to move, wherein the clamp driver comprises an upper mounting arm, a lower mounting arm and a power device, the upper clamp holder is mounted on the upper mounting arm, the lower clamp holder is mounted on the lower mounting arm, and the power device can drive the upper clamp holder and the lower clamp holder to be butted or separated up and down through the upper mounting arm and the lower mounting arm.

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