CN215392982U - Clamp - Google Patents

Abstract

The application discloses anchor clamps for the processing of thimble, the thimble has first location portion. The jig includes a first sub-jig and a second sub-jig. The first sub-clamp and the second sub-clamp are oppositely arranged along the length direction of the thimble. The first sub-clamp includes a first base and a platen. The first base is provided with a limiting groove, and the ejector pin can be placed in the limiting groove. The pressing plate is movably connected to the first base, and the pressing plate is abutted to the ejector pin located in the limiting groove when moving to the pressing position and is positioned in the limiting groove. The second sub-clamp comprises a loose piece, and a second positioning part is arranged on the loose piece. The second positioning part is matched with the first positioning part to position the thimble for the second time, so that the accurate positioning of the thimble is completed. So, the anchor clamps that this application provided make the thimble just can satisfy the requirement of clamping precision after the clamping is accomplished, need not to calibrate again, have effectively improved the clamping precision and the clamping efficiency of thimble.

Description

Clamp

Technical Field

The application relates to the technical field of machining, in particular to a clamp.

Background

The thimble is widely applied to various industries, and the type and the application are various. For example, in the mold industry, ejector pins may be used to separate the product from the mold. When the surface of the product is planar; or when various fixed column positions, such as screw columns, need to be injected on the product, the ejector pins are required to have an anti-rotation function, otherwise, the rotation of the ejector pins can influence the product quality. The anti-rotation function of the thimble is usually satisfied by two forms, one is to set a positioning pin on the head of the thimble, and the other is to cut one or two positioning planes on the head of the thimble.

The end of the thimble is usually machined to a certain shape, such as a cross slot or a bevel, by grinding or electric discharge machining. Because the thimble is longer and the bottom area of the head part of the thimble is smaller, the thimble cannot be directly fixed by a magnetic disk during processing. Therefore, the thimble is often clamped and fixed by a batch machine, as shown in fig. 1. However, since the machining position of the end of the thimble having the rotation preventing function and the positioning pin or the positioning plane of the head have strict position accuracy requirements, the thimble cannot be accurately positioned by clamping and fixing the thimble by using a screwdriver during machining, and the thimble needs to be calibrated by using an instrument, for example, the perpendicularity in the length direction, each time the thimble is clamped. However, because the surface area of the positioning pin or the positioning plane of the head part of the thimble is small and the calibration difficulty is large, the manual calibration is adopted, so that the mode error is large, the clamping precision is low, and the efficiency is low. And the mode of clamping and fixing is carried out by using a screwdriver, only a single thimble can be clamped each time, and the clamping and processing efficiency is lower.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a thimble adds clamping apparatus to solve the clamping precision of thimble or the technical problem of clamping inefficiency.

The embodiment of the application provides a clamp, which is used for machining an ejector pin, wherein the ejector pin is provided with a first positioning part, and the clamp is characterized by comprising a first sub-clamp and a second sub-clamp which are oppositely arranged along the length direction of the ejector pin; the first sub-clamp comprises a first base and a pressing plate; a limiting groove is formed in the first base, and the ejector pin can be placed in the limiting groove; the pressing plate is movably connected to the first base, abuts against the ejector pins in the limiting groove when moving to a pressing position, and positions the ejector pins in the limiting groove; the second sub-clamp comprises a movable block, a second positioning part is arranged on the movable block, and the second positioning part is matched with the first positioning part to position the thimble for the second time.

In some embodiments, the first positioning portion includes a positioning pin, and the second positioning portion includes a positioning groove, and the positioning pin is embedded in the positioning groove to position the ejector pin.

In some embodiments, the number of the limiting grooves is multiple; the number of the second positioning parts is the same as that of the limiting grooves, and the second positioning parts correspond to the limiting grooves one to one.

In some embodiments, the second sub-clamp further comprises a second base; the loose piece comprises a first sub loose piece and a second sub loose piece; the second positioning part is arranged on the first sub-loose piece and/or the second sub-loose piece; the first sub-loose piece and the second sub-loose piece are connected to the second base in a sliding mode.

In some embodiments, the first sub-clamp comprises a first base; a through hole is formed in the first base; the limiting groove is arranged on the side wall of the through hole; the pressing plate is arranged in the through hole, is opposite to the limiting groove, and can be connected to the first base in a sliding mode along the direction close to or far away from the limiting groove.

In some embodiments, the first base is provided with a first threaded hole, and the first sub-clamp comprises a locking screw; the locking screw is matched with the first threaded hole so that the pressing plate can slide to press or loosen the thimble.

In some embodiments, the platen includes a platen body and a slide; the sliding parts are fixed at the end parts of the two ends of the pressing plate body in the length direction, and slide along the top surface of the first base.

In some embodiments, a plurality of the limiting grooves are arranged on the side wall of the through hole; the through holes are arranged in two rows and are oppositely arranged; the limiting grooves which are oppositely arranged are arranged in a staggered mode in the length direction of the first sub-clamp.

In some embodiments, the clip comprises a connecting post; one end of the connecting column is connected to the first sub-clamp, and the other end of the connecting column is connected to the second sub-clamp.

In some embodiments, two ends of the connecting column are provided with positioning bosses, and the first sub-clamp and the second sub-clamp are provided with positioning grooves; the positioning boss is inserted into the positioning groove, and the connecting column is in threaded connection with the first sub-clamp and the second sub-clamp.

In some embodiments, the clamp comprises a magnetic fixture; the magnetic fixing device is fixed at the bottom of the second sub-clamp and used for fixing the clamp.

The clamp provided by the embodiment of the application is used for machining the ejector pin, and the ejector pin is provided with the first positioning part. The clamp includes a first sub-clamp and a second sub-clamp. The first sub-clamp and the second sub-clamp are oppositely arranged along the length direction of the thimble. The first sub-clamp includes a first base and a platen. The first base is provided with a limiting groove, and the ejector pin can be placed in the limiting groove. The pressing plate is movably connected to the first base, abuts against the ejector pins located in the limiting grooves when moving to the pressing position, and positions the ejector pins located in the limiting grooves. The second sub-clamp comprises a movable block, a second positioning part is arranged on the movable block, and the second positioning part is matched with the first positioning part to position the ejector pin for the second time, so that the ejector pin is accurately positioned. Therefore, the clamp provided by the embodiment of the application can meet the requirement of the clamping precision after the thimble is clamped, the thimble does not need to be calibrated, and the clamping precision and the clamping efficiency of the thimble are effectively improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a clamping thimble utilizing a screwdriver in the prior art;

FIG. 2 is a schematic structural view of a thimble machining jig clamping a thimble according to an embodiment of the present disclosure;

FIG. 3 is an exploded schematic view of FIG. 2;

FIG. 4 is an enlarged view of a portion of FIG. 3 at C;

FIG. 5 is a schematic view of a first clamp provided in an embodiment of the present application;

FIG. 6 is a sectional view A-A of FIG. 4;

reference numerals:

100M, 200M thimbles, 210 head, 220 first positioning part, 300 first sub-clamp, 310 spacing groove, 311 first spacing groove, 312 second spacing groove, 320 pressing plate, 321 sliding part, 322 pressing plate body, 323 first pressing plate, 324 second pressing plate, 330 locking screw, 340 positioning groove, 350 datum plane, 360 first base, 370 through hole, 400 second sub-clamp, 410 loose piece, 411 first sub-loose piece, 412 second sub-loose piece, 413 second positioning part, 4111 positioning groove, 4112 second positioning plane, 420 second base, 421 rectangular groove, 422 third threaded hole, 423 fourth threaded hole, 500 connecting column, 510 positioning boss and 600 magnetic fixing device.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first", "second", and "third", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions.

Referring to fig. 2 to 4, the clamp according to the embodiment of the present disclosure is used for processing an ejector pin 200, where the ejector pin 200 has a first positioning portion 220. The clamp comprises a first sub-clamp 300 and a second sub-clamp 400, and the first sub-clamp 300 and the second sub-clamp 400 are oppositely arranged along the length direction of the thimble 200; the first sub-jig 300 includes a first base 360 and a pressing plate 320. The first base 360 is provided with a limiting groove 310, and the thimble 200 can be placed in the limiting groove 310. The pressing plate 320 is movably connected to the first base 360, and when the pressing plate 360 moves to the pressing position, the pressing plate abuts against the ejector pins located in the limiting groove 310, and positions the ejector pins 200 located in the limiting groove 310. The second sub-clamp 400 includes a movable block 410, a second positioning portion 413 is disposed on the movable block 410, and the second positioning portion 413 cooperates with the first positioning portion 220 to position the thimble 200 for the second time. Therefore, the clamp provided by the embodiment of the application can meet the requirement of the clamping precision after the thimble 200 is clamped, calibration is not needed, and the clamping precision and the clamping efficiency of the thimble 200 are effectively improved.

On one hand, since the first sub-jig 300 and the second sub-jig 400 are oppositely arranged along the length direction of the thimble 200, the thimble 200 is placed in the limiting groove 310, and the pressing plate 320 presses the thimble 200. On the other hand, the second positioning portion 413 cooperates with the first positioning portion 220 to perform a secondary positioning on the thimble 200, so as to complete the precise positioning of the thimble 200. Therefore, the clamp provided by the embodiment of the application can meet the requirement of the clamping precision after the thimble 200 is clamped, calibration is not needed, and the clamping precision and the clamping efficiency of the thimble 200 are effectively improved.

The first positioning portion 220 may be disposed on the head portion 210 of the thimble 200, or may be disposed on a side surface of the thimble 200, which is not limited herein. It should be understood that the pressing position is the position where the pressing plate 320 is located when the pressing plate 320 presses the thimble 200 located in the limiting groove 310.

In some embodiments of the present application, referring to fig. 4, the first positioning portion 220 includes a positioning pin, and the second positioning portion 413 includes a positioning groove 4111 (described in detail below), and the positioning pin is inserted into the positioning groove 4111 to position the thimble 200. Specifically, the positioning pin is disposed on the head 210 of the thimble 200. The connection manner of the positioning pin and the head portion 210 of the thimble 200 may be an integral molding, or a welding, or a threaded connection, or a hole-shaft fit (for example, the head portion 210 is provided with a hole, and the positioning pin is inserted into the hole), and is not particularly limited herein.

In other embodiments of the present application, the first positioning portion 220 includes a first positioning surface, which may be a plane or a curved surface, and the like, and is not limited herein. For example, one or two planes, which are the first positioning planes, are milled at the head 210 of the thimble 200. Referring to fig. 4, the second positioning portion 413 includes a second positioning surface 4112 (described in detail below), and the first positioning surface and the second positioning surface 4112 are attached to each other to position the thimble 200.

Referring to fig. 3, 5 and 6, the pressing plate 320 includes a pressing plate body 322 and a sliding portion 321. The pressing plate body 322 is rectangular. The two end surfaces of the pressure plate body 322 in the width direction are provided with positioning holes (not shown) for receiving ends of the locking screws 330 (described in detail below). The sliding portions 321 are fixed to both end portions of the pressing plate body 322 in the length direction, and the sliding portions 321 slide along the top surface of the first base 360. The top surface of the sliding portion 321 is flush with the top surface of the pressing plate body 322.

Referring to fig. 2, 5 and 6, the first sub-jig 300 includes a first base 360. The overall shape of the first base 360 is a rectangular parallelepiped. A through hole 370 is formed on the top surface of the first base 360, and the pressing plate 320 is disposed in the through hole 370 and slidably connected to the first base 360. Illustratively, the through-hole 370 is a square, countersink. The ream flat depth of through-hole 370 with the thickness phase-match of sliding part 321 in the clamp plate 320 makes the clamp plate 320 arrange in back in the through-hole 370 the top surface of sliding part 321 with the top surface of first base 360 is parallel and level mutually, the clamp plate 320 can not outstanding in the top surface of first base 360, thereby it is right to be favorable to the later stage detection instrument the assembly precision of anchor clamps detects. For example, when the parallelism between the top surface of the fixture and the machine tool table is detected by using a detection tool, the pressing plate 320 does not protrude from the top surface of the first base 360, so that the normal use of the detection tool is not affected by the pressing plate 320.

In one embodiment of the present application, the first sub-clip 300 includes a locking screw 330; the locking screw 330 is used for sliding the pressing plate 320 to press or release the thimble 200. Specifically, a first threaded hole (not shown) penetrating into the through hole 370 is formed in a side surface of the first base 360. The locking screw 330 is screwed into the first threaded hole, and an end of the locking screw 330 is capable of being engaged with the positioning hole of the pressing plate body 322 to push the pressing plate 320 to slide so as to press the thimble 200. Because the locking screw 330 can be screwed into or out of the through hole 370 through the first threaded hole, the pressing plate 320 does not need to be disassembled or assembled when the thimble 200 is pressed or loosened, the operation of pressing or loosening the thimble 200 can be quickly completed only by screwing the locking screw 330, and the clamping efficiency of the thimble 200 can be effectively improved. For example, when the thimble 200 needs to be pressed, the thimble 200 is inserted into the through hole 370 and placed at the position-limiting portion, and then the locking screw 330 is screwed into the through hole 370 so that the end of the locking screw 330 abuts against the bottom of the positioning hole of the pressing plate body 322, and as the locking screw 330 is continuously screwed in, the end of the locking screw 330 pushes the pressing plate 320 to slide in a direction approaching to the position-limiting portion so as to press the thimble 200. When the thimble 200 needs to be loosened, the locking screw 330 is screwed out in the opposite direction for a certain distance, and the end of the locking screw 330 is separated from the positioning hole on the pressing plate body 322, so that the pressing plate 320 can not press the thimble 200 any more.

Of course, in other embodiments of the present application, the first sub-clamp 300 may further include a compression spring. The positioning hole of the pressing plate 320 is a through hole, and the locking screw 330 passes through the positioning hole. The pressing plate 320 is slidable along the locking screw 330. The compression spring is sleeved on the locking screw 330. One end of the compression spring abuts against one side surface of the through hole 370, and the other end of the compression spring abuts against the surface of the pressure plate body 322. The compression spring maintains a certain compression margin. The compression spring maintains the tendency of the pressure plate 320 to move toward the retaining groove 310. When the thimble 200 needs to be clamped on a fixture, the pressing plate 320 is manually slid in a direction away from the limiting groove 310, then the thimble 200 is inserted into the limiting groove 310, and then the pressing plate 320 automatically slides in a direction close to the limiting groove 310 under the action of the elastic force of the compression spring and presses the thimble 200 by releasing the hand. Compared with the technical scheme of screwing the locking screw 330 in or out, the technical scheme of using the compression spring enables the operation flow of pressing or loosening the thimble 200 to be more time-saving and quicker.

Referring to fig. 2 and 5, the limiting groove 310 is disposed in the through hole 370, the limiting groove 310 includes a V-shaped groove, and the thimble 200 can be placed in the V-shaped groove. As an example, the V-shaped groove may be a V-shaped groove machined on the side surfaces of the first base 360 and the through hole 370; of course, as another example, a general V-shaped positioning block may be mounted on the side surface of the through hole 370 to form the limiting groove 310, and an existing general V-shaped positioning block is used as the limiting groove 310, so that when the positioning accuracy is damaged due to surface wear of the limiting groove 310, the V-shaped positioning block may be replaced to quickly complete the repair of the fixture, and the service life of the fixture may be effectively prolonged.

In some embodiments of the present disclosure, the number of the limiting grooves 310 in the through holes 370 is multiple, and the number of the through holes 370 is the same as the number of the pressing plates 320 and corresponds to one another. The number of the second positioning portions 413 is the same as that of the limiting grooves 310, and the second positioning portions 413 (described in detail below) correspond to the limiting grooves 310 one to one. Because the problem of clamping error is easily caused by abrasion after the clamp is used for a long time, the technical scheme that the plurality of limiting grooves 310 are arranged on the clamp is beneficial to avoiding the condition that the whole clamp is scrapped due to the abrasion of a single limiting groove 310 and prolonging the service life of the clamp. On the other hand, the plurality of limiting grooves 310 are formed in the fixture, which means that a plurality of ejector pins 200 can be clamped in one clamping operation, and the machining efficiency of the ejector pins 200 can be improved.

As an example, the number of the through holes 370 is plural, and the plural through holes 370 are arranged in two rows and are opposite to each other. Specifically, the number of the through holes 370 may be two. The two through holes 370 are respectively a first through hole (not identified in the figure) and a second through hole, the limiting groove located at the side of the first through hole is a first limiting groove 311, and the limiting groove located at the side of the second through hole is a second limiting groove 312. The first limiting grooves 311 and the second limiting grooves 312 are arranged in two rows and are opposite to each other. The loose piece 410 comprises a first sub loose piece 411 and a second sub loose piece 412 (described in detail below), and positioning grooves 4111 are formed in both the first sub loose piece 411 and the second sub loose piece 412, as shown in fig. 4; accordingly, the pressing plate 320 includes a first pressing plate 323 and a second pressing plate 324. After the thimble 200 is disposed in the limiting groove 310, the first sub-movable block 411 or the second sub-movable block 412 and the pressing plate 320 position the thimble 200. For example, when the thimble 200 is disposed in the first retaining groove 311, the positioning pin (i.e., the first positioning portion 220) at the head portion 210 of the thimble 200 is inserted into the positioning groove 4111 of the first sub-block 411, and the first pressing plate 323 and the second sub-block 412 press the thimble 200. When the thimble 200 is disposed in the second retaining groove 312, the positioning pin (i.e., the first positioning portion 220) at the head portion 210 of the thimble 200 is inserted into the positioning groove 4111 of the second sub-block 412, and the second pressing plate 324 and the first sub-block 411 press the thimble 200.

Further, referring to fig. 5, the oppositely disposed limiting grooves 310 are disposed in a staggered manner in the length direction of the first sub-fixture 300. For example, the first and second retaining grooves 311 and 312 are not arranged opposite to each other, but are offset by a certain distance. Therefore, compared to the technical solution that the first limiting groove 311 and the second limiting groove 312 are opposite to each other, in the technical solution that the first limiting groove 311 and the second limiting groove 312 are staggered by a certain distance, when the first limiting groove 311 and the second limiting groove 312 are both provided with the ejector pins 200, the distance between the central axes of the plurality of ejector pins 200 is increased, which is beneficial to avoiding interference between adjacent ejector pins 200 in the processing process of the ejector pins 200.

Of course, in other examples, the number of the through holes 370 may be one or four. For example, when the number of the through holes 370 is four, the four through holes 370 are respectively a first through hole (not shown), a second through hole (not shown), a third through hole (not shown), and a fourth through hole (not shown). One or more limiting grooves 310 are formed in each through hole 370. The first through hole and the second through hole are symmetrical with respect to a central axis of the first base 360 in a length direction. The third through hole and the fourth through hole are symmetrical with respect to a central axis of the first base 360 in a length direction. The first through hole and the fourth through hole are symmetrical about a central axis of the first base 360 in the width direction.

Further, the first base 360 is further provided with a second threaded hole (not shown) and a positioning groove 340, and the second threaded hole and the positioning groove 340 are used for connecting the first sub-clamp 300 and the second sub-clamp 400 (described in detail below). Specifically, the second threaded hole is disposed on the top surface of the first base 360 and penetrates through the first base 360. The positioning groove 340 is disposed on the bottom surface of the first base 360. The center of the positioning groove 340 coincides with the center of gravity of the first sub-fixture 300, which is beneficial to avoiding the situation that the fixture is damaged or the accuracy of the installation position has errors due to the fact that the fixture bears unnecessary overturning moment.

Further, referring to fig. 2, the first sub-clamp 300 further has a reference surface 350. The reference surface 350 is used for ensuring the accuracy of the mounting position of the fixture after the fixture is mounted and fixed on the machine tool workbench, and is beneficial to further ensuring the clamping precision and the machining precision of the thimble 200. In the embodiment of the present application, the side surface and the top surface of the first base 360 are both flat surfaces, and the reference surface 350 is the side surface and/or the top surface of the first base 360.

Referring to fig. 2, 3 and 4, the second fixture 400 includes a second base 420 and a loose piece 410. The top surface of the second base 420 is provided with a positioning groove 340 and a fourth screw hole 423. The positioning groove 340 and the fourth screw hole 423 are used to connect the first sub-jig 300 and the second sub-jig 400 (described in detail below). The center of the positioning groove 340 coincides with the center of gravity of the second base 420. A rectangular groove 421 is formed in the second base 420, and the rectangular groove 421 is used for accommodating the first sub-loose piece 411 and the second sub-loose piece 412. The rectangular groove 421 penetrates both side surfaces of the second base 420 in the width direction of the second base 420. The side surface of the rectangular groove 421 is provided with a plurality of third threaded holes 422 penetrating to the end surface of the second base 420, and the third threaded holes 422 can be connected with screws to fix the first sub-loose piece 411 or the second sub-loose piece 412.

The first sub-loose piece 411 and the second sub-loose piece 412 are rectangular in overall shape. Specifically, the first sub-loose piece 411 and the second sub-loose piece 412 each have a second positioning portion 413. The second positioning portion 413 includes a positioning groove 4111 and a second positioning surface 4112. The first sub-loose piece 411 and the second sub-loose piece 412 are placed in the rectangular slot 421 and can slide in the rectangular slot 421. Since the size of the head of the thimble 200 is adapted to the size of the diameter of the thimble 200, the larger the diameter of the thimble 200 is, the larger the diameter of the head 200 of the thimble is. Therefore, after the size specification of the thimble 200 changes, the thimble 200 can be secondarily positioned by sliding the first sub-movable block 411 and the second sub-movable block 412, so that the clamp can adapt to the processing of thimbles with different size specifications, and the adaptability of the clamp is improved.

Meanwhile, the first sub-movable block 411 and the second sub-movable block 412 are simultaneously provided with a positioning groove 4111 and a second positioning surface 4112, so that the first sub-movable block 411 and the second sub-movable block 412 can be simultaneously suitable for positioning of different types of thimbles 200. For example, when the first positioning portion 220 of the thimble 200 is a plane, the second positioning surface 4112 is also a plane, and the second positioning surface 4112 in the first sub-movable block 411 or the second sub-movable block 412 can cooperate with the first positioning portion 220 to position the thimble 200. When the first positioning portion 220 of the thimble 200 is a positioning pin, the positioning groove 4111 in the first sub-movable block 411 or the second sub-movable block 412 can cooperate with the first positioning portion 220 to position the thimble 200. It should be noted that the position of the positioning groove 4111 in the first sub-movable block 411 matches the position of the first limiting groove 311, and the position of the positioning groove 4111 in the second sub-movable block 412 matches the position of the second limiting groove 312. That is, when the thimble 200 is located in the first retaining groove 311, the positioning pin at the head portion 210 of the thimble is located in the positioning groove 4111 of the first sub-movable block 411, and when the thimble 200 is located in the second retaining groove 312, the positioning pin at the head portion 210 of the thimble is located in the positioning groove 4111 of the second sub-movable block 412.

Referring to fig. 2 and 3, the clamping apparatus includes a connecting column 500. One end of the connecting column 500 is connected to the first sub-jig 300, and the other end of the connecting column 500 is connected to the second jig 400. Specifically, the end faces of the two ends of the connecting column 500 are provided with positioning bosses 510, the positioning bosses 510 of the end face of one end of the connecting column 500 are inserted into the positioning grooves 340 of the first base 360, and the positioning bosses 510 of the end face of the other end of the connecting column 500 are inserted into the positioning grooves 340 of the second base 420. The first sub-clamp 300 is connected with the second clamp 400 through the connecting column 500, so that the clamping and positioning of the thimble 200 can be guaranteed, and the structure and the material saving of the clamp are simplified. Meanwhile, the first base 360, the second base 420 and the connecting column 500 are positioned before the positioning boss 510 and the positioning groove 340 are fixedly connected, so that the position accuracy of the first sub-clamp 300 and the second sub-clamp 400 is guaranteed, and the clamping accuracy of the thimble 200 is further guaranteed. On the other hand, the connection column 500 is screw-coupled to the first and second sub-jigs 300 and 400. Threaded holes (not labeled in the figures) are formed in the end faces of the two ends of the connecting column 500, and after the positioning boss 510 at one end of the connecting column 500 is inserted into the positioning groove 340 on the first base 360, a bolt is screwed into the second threaded hole to realize the connection and fixation of the connecting column 500 and the first base 360. Similarly, after the positioning boss 510 at the other end of the connection column 500 is inserted into the positioning groove 340 of the second base 420, the bolt is screwed into the fourth threaded hole 423 to connect and fix the connection column 500 and the second base 420. First sub-anchor clamps 300, spliced pole 500 and second anchor clamps 400 are through threaded connection's mode, make anchor clamps are whole to be dismantled, are favorable to reducing shared space when anchor clamps deposit.

Further, the clamp further comprises a magnetic fixing device 600; the magnetic fixing device 600 is fixed to the bottom of the second clamp 400, and the magnetic fixing device 600 is used for fixing the clamp. Specifically, the magnetic fixing device 600 is fixed to the bottom of the second base 420. The fixture is fixed on the machine tool workbench, so that the fixed position of the fixture is kept unchanged during processing (such as grinding or electric spark processing) of the ejector pin 200, and the processing precision of the ejector pin 200 is guaranteed. The magnetic fixing mode is adopted, and a matched tool is not needed in the dismounting process, so that the clamp is convenient to dismount on a machine tool workbench; moreover, the fixing effect is not deteriorated after the installation and the disassembly for many times. Of course, the fixture can be fixed on the machine tool workbench in a bolt fixing mode.

The above detailed description is provided for a clamp provided in the embodiments of the present application, and specific examples are applied herein to explain the principles and embodiments of the present application, and the description of the above embodiments is only used to help understanding the technical solutions and core ideas of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. A fixture for machining a thimble (200), the thimble (200) having a first positioning portion (220), the fixture comprising a first sub-fixture (300) and a second sub-fixture (400), the first sub-fixture (300) and the second sub-fixture (400) being arranged opposite to each other along a length direction of the thimble (200);

the first sub-clamp (300) comprises a first base (360) and a platen (320); a limiting groove (310) is formed in the first base (360), and the ejector pin (200) can be placed in the limiting groove (310); the pressing plate (320) is movably connected to the first base (360), and when the pressing plate (320) moves to a pressing position, the pressing plate abuts against the ejector pins in the limiting groove (310), and the ejector pins (200) in the limiting groove (310) are positioned in the limiting groove (310);

the second sub-clamp (400) comprises a movable block (410), a second positioning part (413) is arranged on the movable block (410), and the second positioning part (413) is matched with the first positioning part (220) to perform secondary positioning on the thimble (200).

2. The clamp of claim 1, wherein the first positioning portion (220) comprises a positioning pin, and the second positioning portion (413) comprises a positioning groove (4111), the positioning pin being inserted into the positioning groove (4111) to position the thimble (200).

3. The clamp according to claim 1, characterized in that the number of the limiting grooves (310) is plural; the number of the second positioning portions (413) is the same as that of the limiting grooves (310), and the plurality of second positioning portions (413) correspond to the plurality of limiting grooves (310) one to one.

4. The clamp according to claim 3, wherein the second sub-clamp (400) further comprises a second base (420); the loose piece (410) comprises a first sub loose piece (411) and a second sub loose piece (412); the second positioning part (413) is arranged on the first sub-loose piece (411) and/or the second sub-loose piece (412); the first sub-loose piece (411) and the second sub-loose piece (412) are connected with the second base in a sliding mode.

5. The clamp according to claim 1, characterized in that said first sub-clamp (300) comprises a first base (360); a through hole (370) is formed in the first base (360); the limiting groove (310) is arranged on the side wall of the through hole (370); the pressing plate (320) is arranged in the through hole (370), is opposite to the limiting groove (310), and can be connected to the first base (360) in a sliding mode along the direction close to or far away from the limiting groove (310).

6. The clamp according to claim 5, wherein the first base (360) is provided with a first threaded hole, and the first sub-clamp (300) comprises a locking screw (330); the locking screw (330) is matched with the first threaded hole to enable the pressure plate (320) to slide so as to press or loosen the thimble (200).

7. The clamp according to claim 5, wherein the platen (320) comprises a platen body (322) and a slide (321); the sliding parts (321) are fixed at the end parts of the two ends of the pressing plate body (322) in the length direction, and the sliding parts (321) slide along the top surface of the first base (360).

8. The clamp according to claim 5, wherein a plurality of the limiting grooves (310) are provided on the side wall of the through hole (370); the through holes (370) are arranged in two rows and are opposite to each other; the limiting grooves (310) which are oppositely arranged are arranged in a staggered mode along the length direction of the first sub-clamp (300).

9. The clamp according to claim 1, characterized in that it comprises a connecting column (500); one end of the connecting column (500) is connected to the first sub-jig (300), and the other end of the connecting column (500) is connected to the second sub-jig (400).

10. The clamp according to claim 9, wherein both ends of the connecting column (500) are provided with positioning bosses (510), and the first sub-clamp (300) and the second sub-clamp (400) are provided with positioning grooves (340); the positioning boss (510) is inserted into the positioning groove (340), and the connecting column (500) is in threaded connection with the first sub-clamp (300) and the second sub-clamp (400).

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