Hydraulically-driven self-centering clamp

Abstract

The utility model discloses a hydraulically-driven self-centering clamp, and belongs to the field of clamp equipment. The structure comprises a seat frame (1), a hydraulic cylinder (2), a driving block (6), a transmission assembly, a clamping block A (9) and a clamping block B (10), the driving block (6), the clamping block A (9) and the clamping block B (10) are arranged on the seat frame (1) in a sliding mode, a cylinder body of the hydraulic cylinder (2) is connected with the seat frame (1), a rod body of the hydraulic cylinder (2) is connected with the driving block (6), the clamping block A (9) and the clamping block B (10) are connected with the driving block (6) through the transmission assembly, and the hydraulic cylinder (2) drives the driving block (6) to enable the clamping block A (9) and the clamping block B (10) to move towards the side of the driving block (6). The hydraulic cylinder (2) achieves synchronous movement of the driving block (6), the clamping block A (9) and the clamping block B (10), it is guaranteed that when a workpiece is clamped, the center line of the workpiece and the intersection line automatically coincide, and automatic centering is achieved. The problems that an existing automatic centering clamp is complex in structure, low in universality and high in production cost are solved.

Description

TECHNICAL FIELD

[0001] The utility model discloses a hydraulic drive's self centering fixture belongs to fixture equipment field. BACKGROUND

[0002] The fixture is the device for the quick, convenient, safe clamping workpiece, and when the milling machine, boring machine and other machine tools need to mill, punch, groove and other processing operations on the end face and cylindrical surface of the cylindrical workpiece, the axis of the cylindrical workpiece is usually used as the process reference, and the traditional fixture is used for centering the workpiece after clamping, and the centering is completed by using the milling machine tool device, and the workpiece is clamped manually, so that the automatic centering and automatic clamping of the workpiece can be completed when the fixture is clamped, so as to improve the processing efficiency and meet the intelligent clamping of the automatic production line.

[0003] At present, the three-jaw chuck is usually used for clamping the cylindrical workpiece, and specifically, the Chinese utility model with the patent number ZL202021328194.5 can be referred to as an automatic centering three-jaw chuck, the chuck comprises a disc body and a driving disc arranged in the disc body, a plurality of movable clamping parts are arranged in the disc body, the centering operation of the workpiece is realized by simultaneously retracting the three claws, the chuck is used for the lathe, and a transition disc is needed, and the structure is relatively complex, and the centering fixture used for the milling machine, boring machine and other machine tools is mainly a special fixture designed for specific workpieces, and the universality is not strong, for example, the production cost is increased by adding a plurality of size specifications of the tool fixture, the Chinese utility model with the patent number ZL202021328194.5 is an automatic centering fixture, which can realize the automatic centering of the workpieces of multiple specifications, but the clamping needs to be completed manually, and it is not convenient to use on the automatic production line. Therefore, on the automatic production line, a self-centering milling machine fixture with the advantages of simple structure, strong universality, accurate positioning and automatic clamping is urgently needed. CONTENT OF THE UTILITY MODEL

[0004] The technical problem to be solved by the utility model is that the existing automatic centering fixture has the problems of complex structure, poor universality and high production cost.

[0005] The utility model adopts the technical scheme that a hydraulic drive's self centering fixture, including seat frame, hydraulic cylinder, drive block, transmission assembly, clamping block A and clamping block B, the drive block, clamping block A and clamping block B are slidably arranged on the upper end of the seat frame, and the clamping block A and the clamping block B are arranged on the two sides of the drive block respectively, the cylinder body of the hydraulic cylinder is connected with one side of the seat frame, the rod body extension end is connected with the drive block, the clamping block A and the clamping block B are connected with the drive block through the transmission assembly, and the drive block moves under the drive of the hydraulic cylinder, so that the one end of the clamping block A and the clamping block B moves to the side of the drive block simultaneously.

[0006] Among them, the drive block, clamping block A and clamping block B in the above structure are arranged in an arrow shape.

[0007] The transmission assembly in the structure comprises gears, the gears are symmetrically arranged on both sides of the driving block, and the driving block is provided with a rack on each side and in mesh with the corresponding side gear.

[0008] The lower end of the driving block is provided with a middle slide rail, and the middle slide rail is slidingly arranged in the middle slide groove.

[0009] Further, the middle slide groove and the side slide groove B in the structure are dovetail groove structures, and the middle slide rail and the side slide rail are dovetail-shaped structures.

[0010] Further, the upper end of the seat frame is provided with support shafts, and the support shafts are located on both sides of the middle slide groove.

[0011] Further, the width of the rack on each side of the driving block is half of the width of the gear teeth, and the two are engaged in the upper part of the gear teeth.

[0012] Further, the width of the rack on the side wall of the clamp block A and the clamp block B is half of the width of the gear teeth, and the two are engaged in the lower part of the gear teeth.

[0013] Further, the lower end of the seat frame is provided with fixing holes, and the seat frame is provided with a plurality of supports near the end of the side slide groove A and the side slide groove B.

[0014] Further, the structure further comprises a cover, the cover is detachably arranged on the seat frame, and the cover is provided with a through hole, so that the upper end of the support shaft can be arranged on the cover.

[0015] The beneficial effects of the present application are: the center faces of the middle slide groove and the two side slide grooves of the seat frame are converged into a line during the design of the structure, the middle driving block and the clamp block A and the clamp block B on both sides are assembled to the extreme position of the seat frame slide groove during assembly, which can ensure that the distance between the center line of the contact arc surface of the front end of them and the convergence line is the same, and the movement of the middle driving block and the clamp block A and the clamp block B on both sides is synchronized during work by using the hydraulic cylinder drive. Thus, when clamping the workpiece, the center line of the workpiece and the convergence line are automatically coincided, thereby realizing the automatic centering of the workpiece during intelligent clamping. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The structure of the present application is shown in the figure.

[0017] Figure 2 It is the bottom view structural schematic diagram of the utility model.

[0018] Figure 3 It is the bottom view structural schematic diagram of the utility model.

[0019] Figure 4 It is the bottom view structural schematic diagram of the utility model Figure 3 middle C-C cross section structure schematic diagram.

[0020] Figure 5 It is the bottom view structural schematic diagram of the utility model Figure 3 remove the structure schematic diagram of machine cover.

[0021] Figure 6 It is the bottom view structural schematic diagram of the utility model Figure 5 middle A-A cross section structure schematic diagram.

[0022] Figure 7 It is the bottom view structural schematic diagram of the utility model Figure 5 middle B-B cross section structure schematic diagram.

[0023] Figure 8 It is the seat frame structure schematic diagram of the utility model.

[0024] Figure 9 It is the drive block structure schematic diagram of the utility model.

[0025] In the drawing, marked: 1 is seat frame, 101 is fixed hole, 102 is side wall bolt hole, 103 is seat hole, 104 is middle sliding groove, 105 is support shaft, 106 is side sliding groove A, 107 is flange bolt hole, 108 is support, 109 is side sliding groove B, 2 is hydraulic cylinder, 3 is connecting bolt, 4 is fixed bolt, 6 is drive block, 601 is middle sliding rail, 602 is positioning block, 603 is rack, 604 is connecting shaft, 7 is double row angular contact ball bearing, 8 is gear, 9 is clamp block A, 10 is clamp block B, 11 is machine cover, 12 is tray, 13 is sleeve, 14 is workpiece, 15 is shaft sleeve. DETAILED DESCRIPTION

[0026] The utility model is further explained below in connection with the drawings.

[0027] As Figures 1 to 9As shown, the utility model discloses a hydraulic drive's self centering fixture, including seat frame 1, hydraulic cylinder 2, drive block 6, transmission assembly, clamping block A 9 and clamping block B 10, drive block 6, clamping block A 9 and clamping block B 10 are slidably arranged on the upper end of seat frame 1, and clamping block A 9 and clamping block B 10 are arranged on the both sides of drive block 6 respectively, the cylinder body of hydraulic cylinder 2 is connected with one side of seat frame 1, the rod body protruding end is connected with drive block 6, clamping block A 9 and clamping block B 10 are connected with drive block 6 through transmission assembly, and hydraulic cylinder 2 drives drive block 6 to move to make clamping block A 9 and clamping block B 10 one end move to the side of drive block 6 simultaneously. Those skilled in the art can understand that the connecting bolt 3 that hydraulic cylinder 2 passes through the 4 side wall bolt holes 102 on the side wall of seat frame 1 is fixed together with seat frame 1, the rod body of hydraulic cylinder 2 passes through seat hole 103, and the connecting shaft 604 of the rod body protruding end and drive block 6 is connected together in the mode of screw connection through sleeve 13, since drive block 6 is slidably arranged on seat frame 1, actual hydraulic cylinder 2 can drive drive block 6 to reciprocate. Clamping block A 9 and clamping block B 10 are arranged on the both sides of drive block 6 respectively, and clamping block A 9 and clamping block B 10 are slidably connected with the upper segment of seat frame 1 respectively, so that clamping block A 9 and clamping block B 10 are connected with drive block 6 through transmission assembly, and this structural arrangement makes hydraulic cylinder 2 drive drive block 6 to move to make clamping block A 9 and clamping block B 10 one end move to the side of drive block 6 simultaneously, realizes the motion synchronization of drive block 6 and the clamping block A 9, clamping block B 10 on both sides, and then drive block 6, clamping block A 9 and clamping block B 10 act on the different sides of workpiece 14 respectively, realize clamping workpiece 14. In order to guarantee the clamping quality, the positioning block 602 is preferably arranged at the end of drive block 6 away from hydraulic cylinder 2, and the positioning block 602 is directly acted on workpiece 14 on the side of hydraulic cylinder 2.

[0028] Preferably, the drive block 6, clamping block A 9 and clamping block B 10 in the above structure are arranged in arrowhead shape. Those skilled in the art can understand that the drive block 6, clamping block A 9 and clamping block B 10 are preferably arranged in arrowhead shape, which guarantees that the center line of the contact arc surface of their front ends and the distance from the intersection line are the same, and realizes the motion synchronization of the middle drive block 6 and the clamping block A 9, clamping block B 10 on both sides by using hydraulic cylinder 2 to drive during work. Thus, the center line of workpiece 14 and the intersection line are automatically coincided when clamping workpiece 14, so that the automatic centering of workpiece 14 during intelligent clamping is realized.

[0029] Preferably, the transmission assembly in the above structure comprises gears 8, which are symmetrically arranged on both sides of the driving block 6, and the driving block 6 is provided with a rack 603 on both sides to engage with the corresponding side gear 8, and the inner side of the clamping block A 9 and the clamping block B 10 is provided with a rack 603 to engage with the corresponding side gear 8. Those skilled in the art can understand that the structure further preferably transmits the assembly to the gear 8, specifically symmetrically arranging the gear 8 on both sides of the driving block 6, and the driving block 6 is provided with a rack 603 on both sides to engage with the corresponding side gear 8, and the inner side of the clamping block A 9 and the clamping block B 10 is provided with a rack 603 to engage with the corresponding side gear 8, so that the driving block 6 can drive the gear 8 to rotate, thereby driving the clamping block A 9 and the clamping block B 10 to slide, achieving the purpose of clamping or loosening the workpiece 14.

[0030] Preferably, the above structure is provided with side sliding groove A 106, middle sliding groove 104 and side sliding groove B 109 on the upper end of the seat frame 1, the lower end of the driving block 6 is provided with a middle sliding rail 601, and the middle sliding rail 601 is slidingly arranged in the middle sliding groove 104; the lower part of the clamping block A 9 and the clamping block B 10 is respectively provided with a side sliding rail, and the side sliding rail of the lower part of the clamping block A 9 and the clamping block B 10 is respectively slidingly arranged in the side sliding groove A 106 and the side sliding groove B 109. Those skilled in the art can understand that in order to ensure the sliding direction of the driving block 6, the clamping block A 9 and the clamping block B 10 is fixed, and the clamping quality is ensured. The structure specifically provides the side sliding groove A 106, the middle sliding groove 104 and the side sliding groove B 109 on the upper end of the seat frame 1, which can be preferably arranged in the form of an arrow, and the middle sliding rail 601 is arranged at the lower end of the driving block 6, and the middle sliding rail 601 is slidingly arranged in the middle sliding groove 104; at the same time, the lower part of the clamping block A 9 and the clamping block B 10 is respectively provided with a side sliding rail, and the side sliding rail of the lower part of the clamping block A 9 and the clamping block B 10 is respectively slidingly arranged in the side sliding groove A 106 and the side sliding groove B 109, which is arranged in this structure. The middle sliding rail 601 at the lower part of the driving block 6 is slidingly arranged in the middle sliding groove 104 in the form of clearance fit, which can slide back and forth to achieve the clamping or loosening of the workpiece 14 in the middle. Similarly, the clamping block A 9 and the clamping block B 10 are slidingly arranged in the side sliding groove A 106 and the side sliding groove B 109 through the side sliding rail to achieve the clamping or loosening of the workpiece 14 on both sides.

[0031] Preferably, the above structure is provided with side sliding groove A 106, middle sliding groove 104 and side sliding groove B 109 on the upper end of the seat frame 1, the lower end of the driving block 6 is provided with a middle sliding rail 601, and the middle sliding rail 601 is slidingly arranged in the middle sliding groove 104; the lower part of the clamping block A 9 and the clamping block B 10 is respectively provided with a side sliding rail, and the side sliding rail of the lower part of the clamping block A 9 and the clamping block B 10 is respectively slidingly arranged in the side sliding groove A 106 and the side sliding groove B 109. Those skilled in the art can understand that in order to ensure the sliding direction of the driving block 6, the clamping block A 9 and the clamping block B 10 is fixed, and the clamping quality is ensured. The structure specifically provides the side sliding groove A 106, the middle sliding groove 104 and the side sliding groove B 109 on the upper end of the seat frame 1, which can be preferably arranged in the form of an arrow, and the middle sliding rail 601 is arranged at the lower end of the driving block 6, and the middle sliding rail 601 is slidingly arranged in the middle sliding groove 104; at the same time, the lower part of the clamping block A 9 and the clamping block B 10 is respectively provided with a side sliding rail, and the side sliding rail of the lower part of the clamping block A 9 and the clamping block B 10 is respectively slidingly arranged in the side sliding groove A 106 and the side sliding groove B 109, which is arranged in this structure. The middle sliding rail 601 at the lower part of the driving block 6 is slidingly arranged in the middle sliding groove 104 in the form of clearance fit, which can slide back and forth to achieve the clamping or loosening of the workpiece 14 in the middle. Similarly, the clamping block A 9 and the clamping block B 10 are slidingly arranged in the side sliding groove A 106 and the side sliding groove B 109 through the side sliding rail to achieve the clamping or loosening of the workpiece 14 on both sides.

[0032] Preferably, the upper end of the seat frame 1 is provided with a support shaft 105, which is located on both sides of the middle sliding groove 104. The outer side of the support shaft 105 is provided with a double-row contact ball bearing 7, and the gear 8 is in interference fit with the double-row contact ball bearing 7. Those skilled in the art can understand that in order to reduce the rotating friction of the gear 8, the upper end of the seat frame 1 is provided with a support shaft 105, which is located on both sides of the middle sliding groove 104. The inner ring of the double-row angular contact ball bearing 7 is installed in the middle section of the support shaft 105 in transition fit, the outer ring of the double-row angular contact ball bearing 7 is installed with the gear 8 in interference fit, and the shaft sleeve 15 is installed on the upper section of the support shaft 105 in transition fit, thereby axially fixing the double-row angular contact ball bearing 7.

[0033] Preferably, the width of the rack 603 on both sides of the driving block 6 is half of the tooth width of the gear 8, and is engaged with the upper part of the tooth width of the gear 8. Those skilled in the art can understand that in order to reduce wear, the width of the rack 603 on both sides of the driving block 6 is half of the tooth width of the gear 8, and is engaged with the upper part of the tooth width of the gear 8, so that the back-and-forth movement of the driving block 6 drives the gear 8 to rotate in opposite directions.

[0034] Preferably, the width of the rack 603 on the side wall of the clamping block A 9 and the clamping block B 10 is half of the tooth width of the gear 8, and is engaged with the lower part of the tooth width of the gear 8. Those skilled in the art can understand that the width of the rack 603 on the side wall of the clamping block A 9 and the clamping block B 10 is half of the tooth width of the gear 8, and is engaged with the lower part of the tooth width of the gear 8, so that the back-and-forth movement of the clamping block A 9 driven by the rotation of the gear 8 in opposite directions realizes the clamping or loosening of the workpiece 14 on one side. The clamping block B 10 is assembled in the same way on the other side, and its back-and-forth movement realizes the clamping or loosening of the workpiece 14 on the other side.

[0035] Preferably, the lower end of the seat frame 1 is provided with a fixing hole 101, and the side sliding groove A 106 and the side sliding groove B 109 are provided with a plurality of supports 108 at the close end, and the upper end of the support 108 is provided with a tray 12. Those skilled in the art can understand that in order to facilitate fixation with the machine tool, the lower end of the seat frame 1 is provided with a fixing hole 101, which is connected with the working machine tool by bolt connection. In order to facilitate the placement of the workpiece 14, the seat frame 1 is provided with a plurality of supports 108 at the close end of the side sliding groove A 106 and the side sliding groove B 109, and the tray 12 is installed on the support 108, so that the workpiece 14 can be placed on the tray 12.

[0036] Preferably, the structure further comprises a cover 11, which is detachably arranged on the seat frame 1, and the cover 11 is provided with a through hole, so that the upper end of the support shaft 105 can be arranged on the cover 11. Those skilled in the art can understand that, in order to ensure safety, the structure is provided with the cover 11 to shield the moving parts, specifically, the cover 11 is connected with the seat frame 1 by penetrating the fixing bolt 4 through the flange bolt hole 107, and the cover 11 is provided with a through hole, and the upper segment of the support shaft 105 passes through the hole of the cover 11 to form a complete support shaft 105, thereby ensuring the stability of the structure.

[0037] Working principle: when clamping the workpiece 14, the rod body of the hydraulic cylinder 2 is retracted inward, driving the driving block 6 to slide towards the hydraulic cylinder 2, and the driving block 6 drives the two gears 8 engaged therewith to rotate, and the two gears 8 respectively drive the clamping blocks A 9 and B 10 to slide towards the center of the workpiece 14, thereby achieving clamping of the workpiece 14. When releasing the workpiece 14, the rod body of the hydraulic cylinder 2 is elongated outward, driving the driving block 6 to slide away from the center of the workpiece 14, and the driving block 6 drives the two gears 8 engaged therewith to rotate, and the two gears 8 respectively drive the clamping blocks A 9 and B 10 to slide away from the center of the workpiece 14, thereby achieving release of the workpiece 14. Since the center surfaces of the middle sliding groove 104, the side sliding groove A 106 and the side sliding groove B 109 converge into a line, and the contact lines of the driving block 6, the clamping block A 9 and the clamping block B 10 with the workpiece 14 are at the same distance from the convergence line, and the driving block 6, the clamping block A 9 and the clamping block B 10 move synchronously. Therefore, the center line of the workpiece 14 coincides with the convergence line when clamping the workpiece 14, thereby achieving automatic centering of the workpiece 14 during intelligent clamping.

Claims

1. A hydraulically driven self-centering clamp, characterized in that: The device includes a base (1), a hydraulic cylinder (2), a drive block (6), a transmission assembly, a clamping block A (9), and a clamping block B (10). The drive block (6), clamping block A (9), and clamping block B (10) are slidably disposed on the upper end of the base (1), and clamping blocks A (9) and B (10) are respectively disposed on both sides of the drive block (6). The cylinder body of the hydraulic cylinder (2) is connected to one side of the base (1), and the extended end of the rod is connected to the drive block (6). The clamping blocks A (9) and B (10) are connected to the drive block (6) through the transmission assembly. The hydraulic cylinder (2) drives the drive block (6) to move, which allows one end of clamping blocks A (9) and B (10) to move simultaneously toward the drive block (6).

2. The hydraulically driven self-centering clamp as described in claim 1, characterized in that: The drive block (6), clamping block A (9) and clamping block B (10) are arranged in an arrow shape.

3. The hydraulically driven self-centering clamp as described in claim 1, characterized in that: The transmission assembly includes gears (8), which are symmetrically arranged on both sides of the drive block (6), and racks (603) that mesh with the corresponding side gears (8) are provided on both sides of the drive block (6). The inner sides of the clamping block A (9) and the clamping block B (10) are provided with racks (603) that mesh with the corresponding side gears (8).

4. The hydraulically driven self-centering clamp as described in claim 1, characterized in that: The upper end of the seat (1) is provided with a side slide groove A (106), a middle slide groove (104) and a side slide groove B (109) at intervals. The lower end of the drive block (6) is provided with a middle slide rail (601), and the middle slide rail (601) is slidably disposed in the middle slide groove (104). The lower parts of the clamping block A (9) and the clamping block B (10) are respectively provided with side slide rails, and the side slide rails at the lower parts of the clamping block A (9) and the clamping block B (10) are respectively slidably disposed in the side slide groove A (106) and the side slide groove B (109).

5. A hydraulically driven self-centering clamp as described in claim 4, characterized in that: The side slide groove A (106), the middle slide groove (104) and the side slide groove B (109) are dovetail groove structures, and the middle slide rail (601) and the side slide rail are adapted dovetail structures.

6. The hydraulically driven self-centering clamp as described in claim 3, characterized in that: The upper end of the frame (1) is provided with a support shaft (105) at intervals, and the support shaft (105) is located on both sides of the middle slide groove (104). A double row contact ball bearing (7) is sleeved on the outside of the support shaft (105), and the gear (8) is interference-fitted with the double row contact ball bearing (7).

7. A hydraulically driven self-centering clamp as described in claim 3, characterized in that: The width of the racks (603) on both sides of the drive block (6) is half the width of the gear (8), and the two mesh at the upper part of the width of the gear (8).

8. A hydraulically driven self-centering clamp as described in claim 7, characterized in that: The tooth width of the rack (603) on the sidewall of the clamping block A (9) and the clamping block B (10) is half the tooth width of the gear (8), and the two mesh at the lower part of the tooth width of the gear (8).

9. A hydraulically driven self-centering clamp as described in claim 2, characterized in that: The lower end of the seat (1) is provided with a fixing hole (101), and the seat (1) is provided with a number of supports (108) at intervals near the side slide groove A (106) and side slide groove B (109), and the upper end of the supports (108) is provided with a tray (12).

10. A hydraulically driven self-centering clamp as described in claim 6, characterized in that: It also includes a cover (11), which is detachably mounted on the frame (1) and has a through hole so that the upper end of the support shaft (105) can pass through the cover (11).

Images