CN106826287A - A kind of clamp assembly for clamping square cross - Google Patents

Abstract

A kind of clamp assembly for clamping square cross, including clamp assembly（3）, it is characterised in that：The clamp assembly（3）Including housing（31）, the housing（31）Middle part is provided with can be in relatively close and relative two grip blocks for deviating from of left and right directions：Left grip block（42）With right grip block（41）, in the left grip block（42）Bottom right extended spot and the housing（3）Between, the right grip block（41）Lower-left stretch out place with institute's housing（3）Between be respectively arranged with left spring（421）With right spring（411）.

Description

A fixture assembly for clamping a square workpiece

technical field

The application relates to the field of mechanical manufacturing equipment, in particular to a fixture assembly for clamping a square workpiece.

Background technique

CNC milling machines can process a wide range of processes and have high precision, so they are more and more widely used. But at present, the processing objects, that is, the processed workpieces, are mostly rectangular or cylindrical workpieces with regular shapes. When processing rectangular workpieces, the workpieces are usually clamped by flat-nose pliers with strong versatility. In mass production, due to the size error of the workpiece itself or the size of the blanks, it is necessary to re-set the tool to determine the coordinate system of the workpiece when replacing the workpiece. As a result, the auxiliary time during processing is too long, and the processing efficiency is affected to a certain extent.

Contents of the invention

The object of the present invention is to provide a fixture assembly for clamping a square workpiece, which can overcome the following defects in the prior art.

A fixture assembly for clamping a square workpiece according to the present invention, including the fixture assembly, is characterized in that: the fixture assembly includes a housing, and the middle part of the housing is provided with two parts that can be relatively close to and relatively away from each other in the left and right directions. A clamping block: a left clamping block and a right clamping block, between the lower right extension of the left clamping block and the housing, between the lower left extension of the right clamping block and the housing A left spring and a right spring are arranged respectively between them, and a left wedging block and a right wedging block that can slide up and down are respectively arranged on the left side of the left clamping block and the right side of the right clamping block. Between the wedging block and the left clamping block and between the right wedging block and the right clamping block are in contact with an inclined surface, and the lower end surfaces of the left wedging block and the right wedging block are set There is an inclined surface, and the inclined surface is in contact with the inclined surfaces on the left and right top tightening parts with slopes on both sides of the clamping bracket. The upper ends of the left wedging block and the right wedging block are each provided with a spring. The middle part between the left clamping block and the right clamping block is provided with a top plate which is fixedly connected with the lifting screw extending downwards and passing through the middle boss of the housing to determine the position of the workpiece in the up and down direction. The lifting screw is provided with an axial long groove that is wedged with the anti-rotation gear, and the lower part of the lifting screw is provided with a nut. The shaft is installed in the front and rear directions and erected on the front and rear side walls of the housing, and the clamping bracket includes a left top tightening part, a right top tightening part, and a pushing part connecting the left top tightening part and the right top tightening part , the middle part of the push part is provided with a screw hole that is screwed with the lines on the front part of the push rod clamping the jacking motor, and the push rod between the front inner wall of the housing and the push part is provided with a clutch and a lifting drive belt connected to the drive pulley installed on the worm shaft, the top of the left clamping block is also provided with a through hole for installing a centering assembly for centering in the front and rear directions, and the centering The assembly includes a front bracket and a rear bracket that are both L-shaped. The front bracket includes a cylindrical front guide part and a front clamping part. A rear slope is provided at the end of the front guide part. There are two rollers that contact the front side of the workpiece when clamping, and a front ring is provided near the rear slope on the front guide, and the front ring is connected to the through hole on the left clamping block. A front telescopic spring is installed between them, and the front guide part is provided with a guide key which slides and fits with the axial straight groove at the front part of the through hole on the left clamping part near the front clamping part. The rear bracket includes a cylindrical rear guide part and the rear clamping part, the end of the rear guide part is provided with a front slope, and the inner side of the rear clamping part is provided with two rollers that contact the front side of the workpiece during clamping, and the rear guide part is close to the A rear ring is arranged at the front slope, a rear telescopic spring is installed between the rear ring and the through hole on the left clamping block, and a rear guide part is provided with a left clamping part near the rear clamping part The front key of the upper through hole is fitted with a sliding fit of the axial straight groove, and a jack pin with inclined planes on both sides is installed between the front slope and the rear slope. Department, the left end is provided with a centering spring, when When the left clamping block and the right clamping block are relatively close to clamp the workpiece, the workpiece first contacts the ejector pin, and during the gradual clamping process, the ejector pin is pushed into the left In the clamping block, at the same time, the front guide part and the rear guide part move inwardly under the action of the front telescopic spring and the rear telescopic spring respectively to realize the The workpiece is centered and positioned front and back.

In a further technical solution, a conveyor belt is installed on the right side of the clamp assembly to convey the feed chute for the processed workpiece, a storage tank is provided on the left side of the clamp assembly, and a storage tank is located above the storage tank for pushing The material distributing and pushing device of the workpiece, after the workpiece is positioned and clamped in the fixture assembly, is processed on the vertical CNC milling machine, and the workpiece is sent to the next required station by the feeding chute after processing.

In a further technical solution, when the clamping and lifting motor drives the pushing part to move inwardly, the left wedge block and the right wedge block move upwards, thereby pushing the left clamping block and the right clamping block to face each other When the clamping and lifting motor drives the pushing part to move outward, the left wedge and the right wedge move downward under the action of the spring and the spring, and at the same time, the The left clamping block and the right clamping block move away from each other under the action of the left spring and the right spring respectively to release the workpiece.

In a further technical solution, when the clutch is engaged with the driving pulley, the worm shaft is driven to rotate through the lifting transmission belt, and then the worm wheel is driven to rotate, and the lifting screw produces a lifting action to position the workpiece in the up and down direction.

Through the invention, the workpieces can be automatically centered in front, rear and left and right directions during the clamping process, ensuring that only one tool setting is required when batches of workpieces are processed on the numerically controlled milling machine. Since the clamping block that can slide left and right is set, the left clamping block and the right clamping block are relatively close to each other synchronously through the forward and backward movement of the clamping bracket, so that the centering and positioning in the left and right directions are realized, and the workpiece is clamped at the same time. At the same time, due to the arrangement of the left and right springs and the spring at the upper end of the wedging block, the left and right clamping blocks work reliably when they deviate from each other; due to the setting of the centering component, the process of clamping the workpiece when the left and right clamping blocks are relatively close Among them, the workpiece presses the ejector pin into the left clamping block so that the front bracket and the rear bracket are pressed against the workpiece at the same time, so that the workpiece can also realize the automatic centering function in the front and rear directions; Lift the workpiece to the required position, so that the top surface of the workpiece rises to a certain height above the top surface of the left and right clamping blocks, so as to prevent the jaws from being milled off by the tool during processing. In addition, the lifting screw can also be used to process the workpiece After finishing, push the workpiece out of the jaws so that the workpiece can be pushed into the feeding chute under the push of the material distribution push device; due to the clutch, the two actions of clamping and jacking are completed by the clamping and jacking motor, which reduces the The number of motors reduces the manufacturing cost. The structure of the whole equipment is relatively simple, the structure is stable, the cost is low, and the operation is reliable. It can replace manual maintenance. The controller cabinet is cleaned and dusted by suction to ensure the normal operation of the controller cabinet; The centering positioning in two directions reduces the auxiliary time of the processing operation, and realizes the control of the distance from the top surface of the workpiece protruding from the clamping block, ensuring the safety of the processing operation.

Description of drawings

Fig. 1 is a schematic diagram of the overall mechanism of the clamp assembly for clamping a square workpiece of the present invention;

Fig. 2 is the front view of the clamp assembly in Fig. 1;

Figure 3 is a top view of the clamp assembly in Figure 1;

FIG. 4 is an enlarged schematic view of the centering assembly in FIG. 3 .

detailed description

The present invention is described in detail above with reference to FIGS. 1-4 .

A fixture assembly for clamping a square workpiece according to an embodiment, including a fixture assembly 3, characterized in that: the fixture assembly 3 includes a housing 31, and the middle part of the housing 31 is provided with a device that can be relatively close in the left and right directions and Two clamping blocks that are opposite to each other: a left clamping block 42 and a right clamping block 41, between the lower right extension of the left clamping block 42 and the housing 3, the right clamping block 41 A left spring 421 and a right spring 411 are respectively arranged between the lower left protruding part of the lower left part of the body and the housing 3, and a spring that can slide up and down is respectively arranged on the left side of the left clamping block 42 and the right side of the right clamping block 41. The left wedging block 52 and the right wedging block 51, between the left wedging block 52 and the left clamping block 42 and between the right wedging block 51 and the right clamping block 41 with a slope In contact with each other, the lower end surfaces of the left wedging block 52 and the right wedging block 51 are provided with inclined surfaces, and the inclined surfaces are on the sides of the clamping bracket 60 with slopes on the left pressing portion 62 and the right pressing portion 61. The inclined surface of the left wedge block 52 and the upper end of the right wedge block 51 are respectively provided with a spring 521, 511. The lifting screw 83 extending downward and passing through the boss in the middle of the housing is fixedly connected to the top plate 80 for determining the position of the workpiece in the up and down direction. Long groove 86, the bottom of lifting screw rod 83 is provided with a nut 84, and described nut 84 is fixed with the worm gear 81 in the worm gear transmission that is made up of worm gear 81 and worm shaft 82, and described worm shaft 82 direction is installed and erected on The front and rear side walls of the housing 31 , the clamping bracket 60 includes a left tightening part 62 , a right tightening part 61 , and a push part 63 connecting the left tightening part 62 and the right tightening part 61 The middle part of the push part 63 is provided with a screw hole that is screwed with the lines on the front part of the push rod 90 clamping the jacking motor 9, and the push part between the front inner wall of the housing 31 and the push part 63 The rod 90 is provided with a clutch 91 and a lifting transmission belt 92 connected to the driving pulley 921 mounted on the transmission pulley 922 on the worm shaft 82, and the top of the left clamping block 42 is also provided with a centering belt for installation in the front and rear directions. The through hole of the centering assembly, the centering assembly includes a front bracket and a rear bracket that are all L-shaped, and the front bracket includes a cylindrical front guide part 71 and a front clamping part 711, and the front guide part The end portion of 71 is provided with a rear slope 715, and the inner side of the front clamping part 711 is provided with two rollers 730 that contact the front side of the workpiece when clamping, and a front guide part 71 is provided near the rear slope 715. Front ring 714, a front telescopic spring 713 is installed between said front ring 714 and the through hole on the left clamping block 42, and the front guide part 71 is provided with a left clamping part near the front clamping part 711. 42, the front axial straight groove 422 of the upper through hole is slidingly connected with the guide key 712, the rear bracket includes a cylindrical rear guide part 72 and a rear clamping part 721, and the end of the rear guide part 72 is set A front slope 725, the inner side of the rear clamping part 721 is provided with two rollers 730 that contact the front side of the workpiece during clamping, and a rear ring 724 is provided near the front slope 725 at the rear guide part 72, A rear telescopic spring 723 is installed between the rear ring 724 and the through hole on the left clamping block 42, and the rear guide part 72 is provided with a front joint with the through hole on the left clamping part 42 near the rear clamping part 721. The guide key 722 slidingly fitted with the straight groove 424 on the upper part of the axial direction, and a top pin 70 with both sides arranged as slopes is installed between the front slope 725 and the rear slope 715, and the right end of the top pin 70 extends out of the left clamping block The working part, the left end is provided with a centering spring 73, when the left clamping block 42 and the right clamping block 41 are relatively close to clamp the workpiece, the workpiece first contacts with the ejector pin 70, and gradually During the clamping process, the ejector pin 70 is pushed into the left clamping block 42, and at the same time, the front guide part 71 and the rear guide part 72 are respectively positioned at the ends of the front telescopic spring 713 and the rear telescopic spring 723. Under the action, the front clamping part 711 and the rear clamping part 721 move to the inner side to realize the front and rear centering of the workpiece.

Wherein, a conveyor belt is installed on the right side of the clamp assembly 3 to feed the feeding trough 2 for conveying the processed workpiece. In order to push the material distribution pushing device 11 of the workpiece, the workpiece is processed on the vertical CNC milling machine after being positioned and clamped in the clamp assembly 3, and the workpiece is sent to the next required by the feeding trough 2 after processing. site.

Wherein, when the clamping jacking motor 9 drives the pushing part 63 to move inwardly, the left wedging block 52 and the right wedging block 51 move upwards, thereby pushing the left clamping block 42 and the right clamping block The block 41 is relatively close to clamp the workpiece. When the clamping and lifting motor 9 drives the pushing part 63 to move outward, the left wedge 52 and the right wedge 51 are positioned between the spring 521 and the spring 511. Under the action of moving downward, at the same time, the left clamping block 42 and the right clamping block 41 move away from each other under the action of the left spring 421 and the right spring 411 respectively to release the workpiece.

Wherein, when the clutch 91 is engaged with the driving pulley 921, the worm shaft 82 is driven to rotate through the lifting transmission belt 92, and then the worm wheel 81 is driven to rotate, and the lifting screw 83 generates a lifting action so that the workpiece moves upward and downward. Achieve positioning.

The clamping and jacking motor can be a stepping motor or an AC servo motor.

The device can realize automatic centering of the workpieces in the front, rear and left and right directions during the clamping process, ensuring that only one tool setting is required when batches of workpieces are processed on the CNC milling machine.

Since the clamping block that can slide left and right is set, the left clamping block and the right clamping block are relatively close to each other synchronously through the forward and backward movement of the clamping bracket, so that the centering and positioning in the left and right directions are realized, and the workpiece is clamped at the same time. Simultaneously, because left and right springs and the spring on the upper end of the wedging block are provided, the left and right clamping blocks work reliably when they are facing away from each other.

Due to the centering assembly, when the left and right clamping blocks are relatively close to clamp the workpiece, the workpiece presses the ejector pin into the left clamping block to make the front bracket and the rear bracket press against the workpiece at the same time, so that the workpiece is The automatic centering function is also realized in the front and rear directions.

Due to the setting of the lifting screw, the workpiece can be lifted to the required position before clamping, so that the top surface of the workpiece rises to a certain height above the top surface of the left and right clamping blocks, preventing the jaws from being milled off by the tool during processing , In addition, the lifting screw can also be used to push the workpiece out of the jaws after the workpiece is processed, so that the workpiece can be pushed into the feeding groove under the push of the material distribution push device.

Due to the arrangement of the clutch, both clamping and jacking actions are completed by the clamping and jacking motor, which reduces the number of motors and reduces the manufacturing cost. The structure of the whole equipment is relatively simple, the structure is stable, the cost is low, and the operation is reliable. It can replace manual maintenance. The controller cabinet is cleaned and dusted by suction to ensure the normal operation of the controller cabinet; The centering positioning in two directions reduces the auxiliary time of the processing operation, and realizes the control of the distance from the top surface of the workpiece protruding from the clamping block, ensuring the safety of the processing operation.

In the following manner, those skilled in the art can make various changes according to the working mode within the scope of the present invention.

Claims (4)

1. A fixture assembly for clamping a square workpiece, including a fixture assembly (3), characterized in that: the fixture assembly (3) includes a housing (31), and the middle part of the housing (31) is provided with a Two clamping blocks close to and relatively away from: the left clamping block (42) and the right clamping block (41), between the lower right extension of the left clamping block (42) and the housing (3), the right A left spring (421) and a right spring (411) are respectively arranged between the lower left protruding part of the clamping block (41) and the housing (3), and the left and right clamping blocks of the left clamping block (42) The right side of (41) is respectively provided with a left wedging block (52) and a right wedging block (51) that can slide up and down, and between the left wedging block (52) and the left clamping block (42) and the right wedging block The block (51) and the right clamping block (41) are in contact with an inclined plane, and the lower end surfaces of the left wedge block (52) and the right wedge block (51) are provided with an inclined plane, and the inclined plane is connected with the clamping bracket (60) two The slopes on the left top tightening part (62) and the right top tightening part (61) of the side belt are in contact with each other, and the upper ends of the left wedge block (52) and the right wedge block (51) are each provided with a spring (521, 511 ), in the middle between the left clamping block (42) and the right clamping block (41), there is a lifting screw (83) fixedly connected with the lifting screw (83) extending downwards and passing through the boss in the middle of the housing to determine the workpiece up and down The top plate (80) in the direction position, the lifting screw (83) is provided with an axial long slot (86) that is wedged with the anti-rotation tooth (85), and the lower part of the lifting screw (83) is provided with a nut (84), The nut (84) is fixed integrally with the worm gear (81) in the worm gear transmission consisting of the worm gear (81) and the worm shaft (82), and the worm shaft (82) is installed in the front and rear directions and erected on the front and rear sides of the housing (31) Wall, the clamping bracket (60) includes a left top tight part (62), a right top tight part (61), and a push part (63) connecting the left top tight part (62) and the right top tight part (61), pushing The middle part of the part (63) is provided with a screw hole that is screwed with the lines on the front part of the push rod (90) that clamps the jacking motor (9). A clutch (91) and a lifting drive belt (92) are arranged on the push rod (90) of the drive pulley (921) connected with the drive pulley (922) installed on the worm shaft (82), and the left clamping block (42) The top of the top is also provided with a through hole for installing a centering assembly for centering in the front and rear directions. The centering assembly includes a front bracket and a rear bracket that are both L-shaped. The front bracket includes a cylindrical front guide (71) and a front The clamping part (711), the end of the front guide part (71) is provided with a rear slope (715), and the inner side of the front clamping part (711) is provided with two rollers (730) which contact the front side of the workpiece when clamping ), a front ring (714) is provided near the rear slope (715) on the front guide part (71), and a front telescopic spring is installed between the front ring (714) and the through hole on the left clamping block (42) (713), where the front guide part (71) is close to the front clamping part (711) There is a guide key (712) slidingly fitted with the axial straight groove (422) in the front of the through hole on the left clamping part (42), and the rear bracket includes a cylindrical rear guide part (72) and a rear clamping part ( 721), the end of the rear guide part (72) is provided with a front slope (725), and the inner side of the rear clamping part (721) is provided with two rollers (730) that contact the front side of the workpiece during clamping. The guide part (72) is provided with a rear ring (724) near the front slope (725), and a rear telescopic spring (723) is installed between the rear ring (724) and the through hole on the left clamping block (42). The rear guide part (72) is provided with a guide key (722) slidingly fitted with the axial straight groove (424) at the front of the through hole on the left clamping part (42) near the rear clamping part (721). (725) and the rear slope (715) are installed with a top pin (70) with both sides as slopes, the right end of the top pin (70) protrudes from the working part of the left clamping block, and the left end is provided with a centering spring (73) , when the left clamping block (42) and the right clamping block (41) are relatively close to clamp the workpiece, the workpiece first contacts with the ejector pin (70), and in the process of gradually clamping, the ejector pin (70) is ejected into the left clamping block (42), and at the same time, the front guide part (71) and the rear guide part (72) are under the action of the front telescopic spring (713) and the rear telescopic spring (723) respectively. and the rear clamping part (721) move to the inside to realize the front and rear centering of the workpiece. 2. A fixture assembly for clamping a square workpiece according to claim 1, characterized in that: a conveyor belt is installed on the right side of the fixture assembly (3) for feeding the processed workpiece into a feeding trough ( 2), the left side of the fixture assembly (3) is provided with a material storage tank (10), and above the material storage tank (10) is provided with a distributing pushing device (11) for pushing the workpiece, and the workpiece is placed in the clamp After positioning and clamping in the component (3), processing is carried out on a vertical CNC milling machine, and the workpiece is sent to the next required station by the feeding chute (2) after processing. 3. A fixture assembly for clamping a square workpiece according to claim 1, characterized in that: when the clamping and lifting motor (9) drives the pushing part (63) to move inwardly, the The left wedging block (52) and the right wedging block (51) move upwards, thereby pushing the left clamping block (42) and the right clamping block (41) relatively close to clamp the workpiece, when the clamping top When the lifting motor (9) drives the pushing part (63) to move outward, the left wedge (52) and the right wedge (51) move downward under the action of the spring (521) and the spring (511). At the same time, the left clamping block (42) and the right clamping block (41) move away from each other under the action of the left spring (421) and the right spring (411) respectively to loosen the workpiece . 4. A fixture assembly for clamping a square workpiece according to claim 1, characterized in that: when the clutch (91) is engaged with the driving pulley (921), the lifting transmission belt (92) pushes the The worm shaft (82) rotates, and then drives the worm wheel (81) to rotate, and the lifting screw (83) produces a lifting motion to position the workpiece in the up and down direction.