Stroke-adjustable crank connecting rod device for punching machine

Abstract

The stroke-adjustable crank connecting rod device for the punching machine comprises a connecting rod and a crankshaft rotationally connected to the connecting rod, the crankshaft comprises crank arms and an eccentric journal, the crank arms are connected to the front end and the rear end of the eccentric journal, the eccentric journal is rotationally connected with the connecting rod, a mounting hole is formed in the connecting rod, and the eccentric journal rotates in the mounting hole. The outer side of the eccentric shaft neck is sleeved with a hydraulic expansion sleeve, the outer side of the hydraulic expansion sleeve is sleeved with an eccentric adjusting sleeve, the outer side of the eccentric adjusting sleeve is sleeved with at least one set of bearings which are rotationally connected with the connecting rod, and the eccentric adjusting sleeve is arranged on the periphery of the hydraulic expansion sleeve in a sleeving mode and can rotate in the axial direction of the eccentric shaft neck. The eccentric adjusting sleeve and the crankshaft are locked through the hydraulic expansion sleeve, and the inner diameter of the eccentric adjusting sleeve is overlapped with the axis where the outer diameter of the eccentric journal is located. According to the stroke-adjustable crank connecting rod device for the punching machine, the stroke of the crank connecting rod can be effectively adjusted, and the use flexibility of equipment is high.

Description

Technical Field

[0001] The utility model relates to the technical field of punching machines, in particular to a crank-connecting rod device for a punching machine with adjustable stroke. Background Art

[0002] In industrial production, the stamping process is used more and more widely because it saves materials and energy, has high efficiency, does not require high technical skills of operators, and can make products that cannot be achieved by mechanical processing through various mold applications. In order to adapt to different molds, a punch press needs different strokes to meet the process requirements of the product. The stroke is the height difference between the upper and lower limits of the slider. At present, crankshaft high-speed punch presses almost all achieve the stroke adjustment requirements by replacing the crankshaft. After the finished machine is installed, the stroke is fixed and cannot be changed, so the flexibility of the machine is not high. Utility Model Content

[0003] The utility model aims to provide a crank-connecting rod device with adjustable stroke for a punching machine, so as to solve the technical problems in the background technology.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions:

[0005] A crank-connecting rod device for a punch press with adjustable stroke comprises a connecting rod and a crankshaft rotatably connected to the connecting rod, the crankshaft comprises a crank arm and an eccentric journal, the crank arm is connected to the front and rear ends of the eccentric journal, the eccentric journal is rotatably connected to the connecting rod, the connecting rod is provided with a mounting hole, the eccentric journal rotates in the mounting hole, the outer side of the eccentric journal is sleeved with a hydraulic expansion sleeve, the outer side of the hydraulic expansion sleeve is sleeved with an eccentric adjustment sleeve, the outer side of the eccentric adjustment sleeve is sleeved with at least one group of bearings rotatably connected to the connecting rod, the eccentric adjustment sleeve is sleeved on the outer periphery of the hydraulic expansion sleeve and can rotate along the axial direction of the eccentric journal, the eccentric adjustment sleeve is locked to the crankshaft by the hydraulic expansion sleeve, and the inner diameter of the eccentric adjustment sleeve overlaps with the axis where the outer diameter of the eccentric journal is located.

[0006] At least two adjustment holes are arranged at one end of the eccentric adjustment sleeve, and internal threads are arranged in the adjustment holes.

[0007] The hydraulic expansion sleeve comprises a flange part and a sleeve body, wherein the sleeve body is in the mounting hole and the flange part is outside the mounting hole. The sleeve body is filled with hydraulic medium, and a hydraulic screw is threadedly connected to the flange part to adjust the pressure value in the sleeve body.

[0008] The connecting rod includes an upper mounting portion and a lower mounting portion, wherein the upper mounting portion and the lower mounting portion are fixedly connected by screws, a first concave arc portion is provided below the upper mounting portion, and a second concave arc portion is provided above the lower mounting portion, and the first arc portion and the second arc portion are spliced ​​to form a mounting hole.

[0009] The eccentric adjustment sleeve and the eccentric shaft neck are both provided with scale marks on the end faces on the same side for alignment adjustment.

[0010] Compared with the prior art, the crank-connecting rod device for a punching machine with adjustable stroke of the present application can effectively adjust the stroke of the crank-connecting rod, making the equipment highly flexible to use. When adjusting the stroke of the crank, it is only necessary to loosen the hydraulic screw to reduce the internal hydraulic oil pressure of the hydraulic expansion sleeve, restore the deformation of the sleeve body, and eliminate the expansion force. The screw is locked in the adjustment hole of the eccentric adjustment sleeve, and the leaked screw is clamped with a round rod. The eccentric adjustment sleeve is rotated to align the scale line on the end face of the eccentric adjustment sleeve with the scale line on the end face of the eccentric shaft neck, and adjusted to the desired position. Then the hydraulic screw is locked, the hydraulic oil pressure inside the sleeve body increases, the sleeve body is deformed and expanded, and the crank and the eccentric adjustment sleeve are expanded to complete the stroke adjustment of the crank. The adjustment method is simple and quick, which saves the debugging time of the equipment and effectively improves the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 : A schematic diagram of the three-dimensional structure of the present application;

[0012] Figure 2 : A longitudinal cross-sectional structural diagram in this application;

[0013] Figure 3 : Installation structure diagram of crankshaft and eccentric adjustment sleeve;

[0014] Figure 4 : Front view of the eccentric adjustment sleeve. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0016] Specific embodiment 1: Please refer to Figures 1 to 4In the embodiment of the utility model, a crank connecting rod device for a punching machine with adjustable stroke includes a connecting rod 1, a crankshaft 2 rotatably connected to the connecting rod 1, the crankshaft 2 includes a crank arm 201 and an eccentric journal 202, the crank arm 201 is connected to the front and rear ends of the eccentric journal 202, the eccentric journal 202 is rotatably connected to the connecting rod 1, a mounting hole 103 is provided on the connecting rod 1, the eccentric journal 202 rotates in the mounting hole 103, the outer side of the eccentric journal 202 is sleeved with a hydraulic expansion sleeve 3, the outer side of the hydraulic expansion sleeve 3 is sleeved with an eccentric adjustment sleeve 4, the outer side of the eccentric adjustment sleeve 4 is sleeved with at least one set of bearings 5 ​​and rotatably connected to the connecting rod 1, in the present application, the outer side of the eccentric adjustment sleeve 4 The side sleeve is provided with two sets of bearings 5. The eccentric adjustment sleeve 4 is sleeved on the outer periphery of the hydraulic expansion sleeve 3 and can rotate along the axial direction of the eccentric shaft neck 202. The eccentric adjustment sleeve 4 is locked to the crankshaft 2 by the hydraulic expansion sleeve 3. The inner diameter of the eccentric adjustment sleeve 4 overlaps with the axis where the outer diameter of the eccentric shaft neck 202 is located. One end of the eccentric adjustment sleeve 4 is provided with at least two adjustment holes 401, and the adjustment holes 401 are provided with internal threads. In the present application, the eccentric adjustment sleeve 4 is provided with two adjustment holes 401 on the outside. When the eccentric adjustment sleeve 4 needs to be rotated, a screw is connected to the internal thread of the adjustment hole 401, and the eccentric adjustment sleeve is driven to rotate by directly clamping the screw or grasping the screw with other hand tools.

[0017] The hydraulic expansion sleeve 3 includes a flange portion 302 and a sleeve body 301. The sleeve body 301 is in the mounting hole 103, and the flange portion 302 is outside the mounting hole 103. The sleeve body 301 is filled with hydraulic medium. A hydraulic screw 303 is threadedly connected to the flange portion 302 to adjust the pressure value in the sleeve body 301. The hydraulic expansion sleeve 3 is a product of the prior art. The sleeve body 301 is a double-layer sleeve structure made of hardened steel and filled with a certain amount of hydraulic medium. There is also a piston with a sealing ring in the flange portion 302 to maintain a certain hydraulic pressure in the sleeve body 301. When the hydraulic screw 303 is tightened, the sleeve body 301 of the double-layer sleeve structure expands evenly outward, thereby tightly connecting the components in the sleeve body 301 and the components outside the sleeve body 301 together. After loosening the hydraulic screw 303, it returns to its original size, so that the two components are quickly separated again, and the adjustment method is simple and fast.

[0018] The connecting rod 1 includes an upper mounting portion 101 and a lower mounting portion 102, which are fixedly connected by screws. A concave first arc portion is provided below the upper mounting portion 101, and a concave second arc portion is provided above the lower mounting portion 102. The first arc portion and the second arc portion are spliced ​​to form a mounting hole 103.

[0019] The end faces of the eccentric adjustment sleeve 4 and the eccentric shaft neck 202 on the same side are both provided with scale marks for alignment adjustment, so as to realize the positioning adjustment of the eccentric adjustment sleeve 4 and the eccentric shaft neck 202 and accurately adjust the stroke distance of the crank.

[0020] Compared with the prior art, the crank-connecting rod device for a punching machine with adjustable stroke of the present application can effectively adjust the stroke of the crank-connecting rod, making the equipment highly flexible to use. When adjusting the stroke of the crank, it is only necessary to loosen the hydraulic screw to reduce the internal hydraulic oil pressure of the hydraulic expansion sleeve, restore the deformation of the sleeve body, and eliminate the expansion force. The screw is locked in the adjustment hole of the eccentric adjustment sleeve, and the leaked screw is clamped with a round rod. The eccentric adjustment sleeve is rotated to align the scale line on the end face of the eccentric adjustment sleeve with the scale line on the end face of the eccentric shaft neck, and adjusted to the desired position. Then the hydraulic screw is locked, the hydraulic oil pressure inside the sleeve body increases, the sleeve body is deformed and expanded, and the crank and the eccentric adjustment sleeve are expanded to complete the stroke adjustment of the crank. The adjustment method is simple and quick, which saves the debugging time of the equipment and effectively improves the production efficiency.

[0021] It is obvious to those skilled in the art that the present invention is not limited to the details of the foregoing exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0022] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A crank-connecting rod device for a punch press with adjustable stroke, characterized in that: The invention comprises a connecting rod and a crankshaft rotatably connected to the connecting rod, the crankshaft comprises a crank arm and an eccentric journal, the crank arm is connected to the front and rear ends of the eccentric journal, the eccentric journal is rotatably connected to the connecting rod, a mounting hole is provided on the connecting rod, the eccentric journal rotates in the mounting hole, a hydraulic expansion sleeve is provided on the outer side of the eccentric journal, an eccentric adjustment sleeve is provided on the outer side of the hydraulic expansion sleeve, at least one group of bearings is provided on the outer side of the eccentric adjustment sleeve and is rotatably connected to the connecting rod, the eccentric adjustment sleeve is sleeved on the outer periphery of the hydraulic expansion sleeve and can rotate along the axial direction of the eccentric journal, the eccentric adjustment sleeve is locked to the crankshaft by the hydraulic expansion sleeve, and the inner diameter of the eccentric adjustment sleeve overlaps with the axis where the outer diameter of the eccentric journal is located.

2. A crank-connecting rod device with adjustable stroke for a punch press according to claim 1, characterized in that: At least two adjustment holes are arranged at one end of the eccentric adjustment sleeve, and internal threads are arranged in the adjustment holes.

3. A crank-connecting rod device with adjustable stroke for a punch press according to claim 2, characterized in that: The hydraulic expansion sleeve comprises a flange part and a sleeve body, wherein the sleeve body is in the mounting hole and the flange part is outside the mounting hole. The sleeve body is filled with hydraulic medium, and a hydraulic screw is threadedly connected to the flange part to adjust the pressure value in the sleeve body.

4. A crank-connecting rod device with adjustable stroke for a punch press according to claim 3, characterized in that: The connecting rod includes an upper mounting portion and a lower mounting portion, wherein the upper mounting portion and the lower mounting portion are fixedly connected by screws, a first concave arc portion is provided below the upper mounting portion, and a second concave arc portion is provided above the lower mounting portion, and the first arc portion and the second arc portion are spliced ​​to form a mounting hole.

5. The stroke-adjustable crank-connecting rod device for a punch press according to claim 4, characterized in that: The eccentric adjustment sleeve and the eccentric shaft neck are both provided with scale marks on the end faces on the same side for alignment adjustment.

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