Upper die clamping mechanism for numerical control bending machine

Abstract

The utility model relates to the technical field of forging machinery, in particular to an upper die clamping mechanism for a numerical control bending machine, which comprises a mounting seat, a fixing frame fixedly mounted at the bottom of the mounting seat, a hydraulic cylinder fixedly mounted at the top of the mounting seat, and a sliding seat fixedly mounted at the output end of the hydraulic cylinder. Through guide rods are slidably mounted at the two ends of the sliding base correspondingly, mounting grooves are formed in the two sides of the fixing frame correspondingly, first connecting rods are mounted in the two mounting grooves correspondingly and hinged to the two ends of the sliding base correspondingly, second connecting rods are hinged to the ends, away from the sliding base, of the first connecting rods correspondingly, and a third connecting rod is mounted between the two second connecting rods. Clamping plates are fixedly mounted at the bottom ends of the two second connecting rods, and clamping blocks are fixedly mounted on the inner sides of the two clamping plates; the clamping force of the two clamping plates can be the same, and the operation accuracy of equipment is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to forging and pressing mechanical technology field especially relates to a upper die clamping mechanism for numerical control bending machine. BACKGROUND

[0002] Numerical control bending machine is through numerical control system control oil cylinder's up and down movement, thereby driving the die installed on the slider up and down movement, with the lower die installed on the workbench generates extrusion, realizes the bending of workpiece, needs to replace different bending upper die to process different workpieces, therefore replaces easy, clamping firm is the most urgent requirement of current high-grade numerical control bending machine, the original bending machine upper die clamping mechanism has mechanical type and hydraulic type, mechanical type is by artificial tension screw and realizes the loosening and clamping of upper die, because many installation screws, human factors exist (each installation fitter strength is different), it exists the deficiency that clamps not tightly and die replacement time is long, far cannot realize the needs of modernization production,

[0003] Hydraulic type is through the ejection force of the hydraulic cylinder installed on a certain pressing plate and clamps the upper die. In order to improve the existing bending machine upper die clamping mechanism, many improved mechanisms appear on the market, but most of them adopt unilateral hydraulic lateral action, which will lead to uneven force on both sides, and because the hydraulic mechanism is installed laterally, the weight distribution of the entire clamping mechanism is uneven, and the guiding precision is not high. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at solving the existing clamping mechanism's both sides' clamping force distribution uneven shortcoming in the prior art, and proposes a upper die clamping mechanism for numerical control bending machine.

[0005] In order to achieve the above object, the utility model adopts the following technical scheme:

[0006] Design a kind of upper die clamping mechanism for numerical control bending machine, including mounting seat, the bottom of the mounting seat is fixedly installed with fixed frame, the top of the mounting seat is fixedly installed with hydraulic cylinder, the output end of the hydraulic cylinder is fixedly installed with sliding seat, the sliding seat is located the inboard of fixed frame, the both ends of the sliding seat are slidably installed with the guide rod that penetrates, two the guide rod are fixedly installed in the inboard of fixed frame, the both sides of the fixed frame are equipped with installation groove, two the first connecting rod are installed in the first connecting rod, two the first connecting rod are respectively hinged with the both ends of sliding seat, the end of the first connecting rod away from sliding seat is hingedly connected with second connecting rod, the third connecting rod is installed between two the second connecting rod, the both ends of the third connecting rod are rotatably connected with corresponding second connecting rod by pin shaft, the bottom of two second connecting rods is fixedly installed with clamping plate, the inboard of two the clamping plate is fixedly installed with clamping block.

[0007] Preferably, a first spring is fitted at the bottom end of each of the two guide rods, and the first spring is located below the sliding seat.

[0008] Preferably, a buffer assembly is installed on the outer side of the second connecting rod. The buffer assembly includes a support rod, the bottom end of which is hinged to the side wall of the second connecting rod, and a slider is hinged to the top end of the support rod. The slider is slidably installed inside the mounting groove.

[0009] Preferably, the inner wall of the mounting groove is provided with a sliding groove that matches the slider, and the slider can slide in the sliding groove.

[0010] Preferably, a second spring is fixedly installed on the top of the slider, and the top of the second spring is fixedly connected to the top wall of the mounting groove.

[0011] The present invention provides an upper die clamping mechanism for a CNC bending machine, which has the following advantages:

[0012] 1. By controlling the hydraulic cylinder to move the sliding seat downward, the angle between the two first connecting rods and the sliding seat increases, while the angle between the first connecting rod and the corresponding second connecting rod decreases, thus bringing the two clamping plates closer together and finally clamping the clamping blocks together. Throughout the process, the force between the first and second connecting rods at both ends is the same, so the clamping force of the two clamping plates is the same, which solves the problem of uneven distribution of clamping force on both sides of the clamping plates.

[0013] 2. During the downward movement of the sliding seat, the first connecting rod will act on the support rod, causing the support rod to act on the slider to move upward, thereby compressing the second spring. This can reduce the impact force during the clamping process of the two clamping plates and avoid damage to the workpiece. Attached Figure Description

[0014] Fig. 1 This is a schematic diagram of the upper die clamping mechanism for a CNC bending machine proposed in this utility model;

[0015] Fig. 2 This is a schematic diagram of the buffer assembly of the upper die clamping mechanism for a CNC bending machine proposed in this utility model.

[0016] In the diagram: mounting base 1, fixing frame 2, mounting groove 21, hydraulic cylinder 3, sliding seat 4, guide rod 5, first spring 6, first connecting rod 7, buffer assembly 8, support rod 81, slider 82, slide groove 83, second spring 84, second connecting rod 9, third connecting rod 10, clamping plate 11, clamping block 12. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] Reference Figs. 1-2 A clamping mechanism for an upper die of a CNC bending machine includes a mounting base 1, a fixed frame 2 fixedly mounted on the bottom of the mounting base 1, a hydraulic cylinder 3 fixedly mounted on the top of the mounting base 1, a sliding seat 4 fixedly mounted on the output end of the hydraulic cylinder 3, the sliding seat 4 being located inside the fixed frame 2, and through guide rods 5 slidably mounted on both ends of the sliding seat 4. A first spring 6 is sleeved on the bottom end of each of the two guide rods 5, and the first spring 6 is located below the sliding seat 4. Both guide rods 5 are fixedly mounted inside the fixed frame 2. The fixed frame 2 has mounting slots 21 on both sides. The first connecting rod 7 is installed inside the two mounting slots 21. The two first connecting rods 7 are respectively hinged to the two ends of the sliding seat 4. The end of the first connecting rod 7 away from the sliding seat 4 is hinged to the second connecting rod 9. The third connecting rod 10 is installed between the two second connecting rods 9. The two ends of the third connecting rod 10 are respectively rotatably connected to the corresponding second connecting rod 9 through pins. The bottom ends of the two second connecting rods 9 are fixedly installed with clamping plates 11. The inner sides of the two clamping plates 11 are fixedly installed with clamping blocks 12.

[0019] By controlling the hydraulic cylinder 3 to move the sliding seat 4 downward, the angle between the two first connecting rods 7 and the sliding seat 4 increases, while the angle between the first connecting rod 7 and the corresponding second connecting rod 9 decreases, thereby bringing the two clamping plates 11 closer to each other, and finally clamping the clamping blocks 12 together. Throughout the process, the force between the first connecting rods 7 and the second connecting rods 9 at both ends is the same, so the clamping force of the two clamping plates 11 is the same, which solves the problem of uneven distribution of clamping force on both sides of the clamping plates 11.

[0020] A buffer assembly 8 is installed on the outer side of the second connecting rod 9. The buffer assembly 8 includes a support rod 81. The bottom end of the support rod 81 is hinged to the side wall of the second connecting rod 9. A slider 82 is hinged to the top end of the support rod 81. The slider 82 is slidably installed inside the mounting groove 21. A groove 83 matching the slider 82 is provided on the inner wall of the mounting groove 21. The slider 82 can slide in the groove 83. A second spring 84 is fixedly installed on the top of the slider 82. The top of the second spring 84 is fixedly connected to the top wall of the mounting groove 21.

[0021] During the downward movement of the sliding seat 4, the first connecting rod 7 acts on the support rod 81, causing the support rod 81 to act on the slider 82 to move upward, thereby compressing the second spring 84. This can reduce the impact force during the clamping process of the two clamping plates 11 and avoid damage to the workpiece.

[0022] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A clamping mechanism for an upper die of a CNC bending machine, comprising a mounting base (1), wherein a fixing frame (2) is fixedly mounted on the bottom of the mounting base (1), characterized in that, A hydraulic cylinder (3) is fixedly installed on the top of the mounting base (1). A sliding seat (4) is fixedly installed on the output end of the hydraulic cylinder (3). The sliding seat (4) is located inside the fixed frame (2). A through guide rod (5) is slidably installed on both ends of the sliding seat (4). Both guide rods (5) are fixedly installed on the inside of the fixed frame (2). Mounting slots (21) are opened on both sides of the fixed frame (2). A first connecting rod (7) is installed inside both mounting slots (21). The two first connecting rods (7) are respectively hinged to the two ends of the sliding seat (4). The end of the first connecting rod (7) away from the sliding seat (4) is hinged to the second connecting rod (9). A third connecting rod (10) is installed between the two second connecting rods (9). The two ends of the third connecting rod (10) are respectively rotatably connected to the corresponding second connecting rod (9) through pins. The bottom ends of the two second connecting rods (9) are fixedly installed with clamping plates (11). The inner sides of the two clamping plates (11) are fixedly installed with clamping blocks (12).

2. The upper die clamping mechanism for a CNC bending machine according to claim 1, characterized in that, The bottom ends of both guide rods (5) are fitted with first springs (6), which are located below the sliding seat (4).

3. The upper die clamping mechanism for a CNC bending machine according to claim 2, characterized in that, A buffer assembly (8) is installed on the outside of the second link (9). The buffer assembly (8) includes a support rod (81). The bottom end of the support rod (81) is hinged to the side wall of the second link (9). A slider (82) is hinged to the top end of the support rod (81). The slider (82) is slidably installed inside the mounting groove (21).

4. The upper die clamping mechanism for a CNC bending machine according to claim 3, characterized in that, The inner wall of the mounting groove (21) is provided with a sliding groove (83) that matches the slider (82), and the slider (82) can slide in the sliding groove (83).

5. The upper die clamping mechanism for a CNC bending machine according to claim 4, characterized in that, A second spring (84) is fixedly installed on the top of the slider (82), and the top of the second spring (84) is fixedly connected to the top wall of the mounting groove (21).

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