Limiting device of ejection cylinder

Abstract

The invention relates to the technical field of press machine auxiliary devices, in particular to an ejection cylinder limiting device which comprises an ejection assembly connected with a transmission assembly. The limiting assembly comprises a mounting disc, and a travel switch is slidably mounted on the front side face of the mounting disc through a guide assembly; and the adjusting assembly is used for adjusting the length of the leading-out assembly. By arranging the transmission assembly and connecting the first steel wire rope and the second steel wire rope through the hooks, relative sliding of the collision block and the steel wire ropes can be avoided, and the measurement precision is improved; the collision block is lifted by the limiting plate, so that the travel switch can be accurately triggered; by arranging the adjusting assembly, when the length of the first steel wire rope is changed, the adjusting oil cylinder is controlled to work, the adjusting guide wheels can be driven to move, the limiting guide wheels are matched, the first steel wire rope between the limiting guide wheels can be bent, and measurement errors caused by the change of the length of the first steel wire rope can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of press auxiliary devices, in particular to an ejection cylinder limiting device. Background Art

[0002] A press (including punching machines and hydraulic presses) is a general-purpose press with a sophisticated structure. It has the characteristics of wide application and high production efficiency. The press can be widely used in processes such as cutting, punching, blanking, bending, riveting and forming. The metal blank is processed into parts by applying strong pressure to the metal to cause plastic deformation and fracture. When the press shapes the metal, a mold is usually set on the workbench, and an ejector cylinder is set under the workbench. After the forming is completed, the ejector cylinder is controlled to work and the workpiece is ejected from the mold. In order to cooperate with automatic loading and unloading, it is necessary to control the working stroke of the ejector cylinder so that the workpiece is just ejected but the cylinder piston rod does not exceed the mold. The piston rod of the ejector cylinder needs to be limited.

[0003] In the prior art, a travel switch is usually used in conjunction with a positioning block to limit the travel of the ejector cylinder. Since different workpieces have different heights, the position of the travel switch needs to be adjusted when processing different workpieces. The traditional ejector cylinder limit device is directly installed at the bottom of the ejector cylinder, located in the press foundation pit, and the adjustment of the limit switch is very inconvenient.

[0004] In the prior art, there is also a method of connecting the ejection cylinder and the counterweight block by using a steel wire rope, and installing a positioning block in the middle of the steel wire rope. When the ejection cylinder is working, the positioning block can be driven to move by the steel wire rope, and the counterweight block can keep the steel wire rope taut. By setting a steering wheel to change the direction of the steel wire rope, the travel switch can be installed in a position that is convenient for adjustment. However, in actual use, the steel wire rope bears the weight of the counterweight block for a long time and will be stretched by the counterweight block. The length of the steel wire rope will increase with the increase of usage time, resulting in a change in the distance from the positioning block to the top of the ejection cylinder piston rod, thereby resulting in a decrease in positioning accuracy. In addition, the increase in the length of the steel wire rope will cause the diameter to become smaller, thereby resulting in a decrease in the fixing strength of the positioning block. When the positioning block contacts the limit switch, it is blocked by the limit switch, and the positioning block and the steel wire rope will slide relative to each other, resulting in the inability to correctly trigger the limit switch. Summary of the invention

[0005] In order to make up for the above shortcomings, the present invention provides an ejection cylinder limiting device.

[0006] The technical solution of the present invention is: A ejection cylinder limiting device, comprising: The ejection assembly comprises an ejection oil cylinder, which is fixedly mounted at the bottom of the hydraulic press base, and a working piston rod and a measuring piston rod are slidably mounted at both ends of the ejection oil cylinder, and a transmission assembly is connected to the bottom end of the measuring piston rod; The transmission assembly includes a lead-out assembly and a tensioning assembly, a collision block is arranged between the lead-out assembly and the tensioning assembly, the lead-out assembly is connected to the measuring piston rod, and when the measuring piston rod moves, the lead-out assembly can be used to drive the collision block to move horizontally; A limit assembly, the limit assembly includes a mounting plate, a travel switch is slidably mounted on the front side of the mounting plate through a guide assembly, the sliding stroke of the travel switch is the same as the maximum working stroke of the ejection cylinder, and the collision block is located directly below the travel switch; An adjusting component is used to adjust the length of the lead-out component.

[0007] Preferably, the collision block is located outside the hydraulic press base, and the collision block comprises a fan-shaped block, and hooks are symmetrically provided on both sides of the fan-shaped block.

[0008] Preferably, the lead-out assembly comprises a first steel wire rope, one end of which is connected to the end of the measuring piston rod, and the other end of which is connected to a hook.

[0009] Preferably, a plurality of first guide wheels are provided in the middle of the first steel wire rope, and the first guide wheels are used to change the direction of the first steel wire rope.

[0010] Preferably, the tensioning assembly includes a second steel wire rope, one end of which is connected to a hook, and the other end of which is connected to a counterweight assembly.

[0011] Preferably, a plurality of second guide wheels are provided in the middle of the second steel wire rope, and the second guide wheels are used to change the movement direction of the second steel wire rope.

[0012] Preferably, a limiting plate is provided at the bottom of the mounting plate, and the bottom surface of the sector block abuts against the limiting plate and can slide along the limiting plate.

[0013] Preferably, the adjustment assembly includes two limiting guide wheels, the two limiting guide wheels are rotatably mounted on the outside of the hydraulic press base, and the first steel wire rope is slidably connected to the two limiting guide wheels.

[0014] Preferably, an adjusting cylinder is provided between the limiting guide wheels, the axis of the adjusting cylinder is perpendicular to the first steel wire rope between the limiting guide wheels, the adjusting cylinder is connected to the adjusting guide wheel through an adjusting bracket, and the first steel wire rope passes between the adjusting bracket and the adjusting guide wheel.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention, by setting a transmission assembly, can conveniently lead the collision block to any position by using the first steel wire rope and the first guide wheel, so that the travel switch can be installed at a convenient position for adjustment, and the first steel wire rope and the second steel wire rope are respectively connected by hooks to avoid relative sliding between the collision block and the steel wire rope, thereby improving the measurement accuracy; 2. By setting up the internal components and using the limit plate to lift the collision block, it is possible to avoid poor switch contact when the collision block contacts the travel switch because the elasticity of the wire rope is far away from the travel switch, thus ensuring that the travel switch can be accurately triggered; 3. The present invention, by providing an adjustment component, when the length of the first steel wire rope changes, by controlling the adjustment oil cylinder to work, the adjustment guide wheel can be driven to move, and the first steel wire rope between the limit guide wheels can be bent in cooperation with the limit guide wheel, thereby reducing the measurement error caused by the change in the length of the first steel wire rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of a conventional ejector cylinder limit device; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 It is a schematic diagram of the structure of the hydraulic press base and ejection assembly in the present invention; Figure 4 It is a schematic diagram of the structure of the transmission component in the present invention; Figure 5 It is a second schematic diagram of the transmission assembly structure in the present invention; Figure 6 for Figure 4 A schematic diagram of the structure enlargement in the middle; Figure 7 for Figure 5 A magnified schematic diagram of the structure B in the middle; Figure 8 for Figure 4 Enlarged schematic diagram of the C structure in the middle.

[0017] The meanings of the punctuation marks in the figure are: 1. Hydraulic press base; 11. Support foot; 12. Side plate; 13. Workbench; 14. Ejector hole; 2. Ejector assembly; 21. Mounting frame; 22. Ejector cylinder; 23. Working piston rod; 24. Measuring piston rod; 3. Transmission assembly; 31. First steel wire rope; 32. Connecting sleeve; 33. T-shaped bracket; 34. First guide wheel; 35. Collision block; 351. Fan-shaped block; 352. Hook; 36. Second guide wheel; 37. Second steel wire rope; 38. Second connecting sleeve; 39. Counterweight assembly; 391. Counterweight rod; 392. Tray; 393. Counterweight block; 4. Limiting assembly; 41. Mounting plate; 42. Limiting plate; 43. Adjusting scale; 44. Guide rail; 45. Slider; 46. Reading plate; 47. Fixing screw; 48. Hand wheel; 49. Travel switch; 5. Adjustment assembly; 51. Limiting guide wheel; 52. Adjustment guide wheel; 53. Adjustment bracket; 54. Adjustment cylinder; 6. Press pit. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] The present invention describes the above technical solution in detail through the following embodiments: Embodiment 1: See attached Figure 1-8 , an ejection cylinder limiting device, comprising: The ejection assembly 2 includes an ejection cylinder 22, which is fixedly mounted at the bottom of the hydraulic press base 1. A working piston rod 23 and a measuring piston rod 24 are slidably mounted at both ends of the ejection cylinder 22, and the bottom end of the measuring piston rod 24 is connected to a transmission assembly 3.

[0021] The hydraulic press base 1 is installed in the press foundation pit 6. The hydraulic press base 1 includes support feet 11, which are fixedly connected to the ground by expansion bolts. Side panels 12 are welded and installed between the support feet 11. A workbench 13 is fixedly installed on the top of the support feet 11 by bolts. An ejection hole 14 is vertically penetrated in the center of the workbench 13.

[0022] A mounting frame 21 is fixedly installed by bolts just below the ejection hole 14 , and an ejection oil cylinder 22 is fixedly installed by bolts just below the mounting frame 21 .

[0023] The working piston rod 23 and the measuring piston rod 24 are connected to the same piston.

[0024] The transmission assembly 3 includes a lead-out assembly and a tensioning assembly, a collision block 35 is provided between the lead-out assembly and the tensioning assembly, and the lead-out assembly is connected to the measuring piston rod 24. When the measuring piston rod 24 moves, the lead-out assembly can be used to drive the collision block 35 to move horizontally.

[0025] The collision block 35 is located outside the hydraulic press base 1 , and includes a sector block 351 , and hooks 352 are symmetrically welded on both sides of the sector block 351 .

[0026] The lead-out assembly includes a first steel wire rope 31 , one end of which is connected to the end of the measuring piston rod 24 , and the other end of which is connected to the hook 352 .

[0027] One end of the first steel wire 31 is clamped with a connecting sleeve 32, and the connecting sleeve 32 is threadedly connected to the end of the measuring piston rod 24. The other end of the first steel wire 31 passes through the hook 352, is bent into a loop, and is fixed by a known steel wire fastener.

[0028] A plurality of first guide wheels 34 are provided in the middle of the first steel wire rope 31 , and the first guide wheels 34 are used to change the direction of the first steel wire rope 31 .

[0029] A T-shaped bracket 33 is fixedly mounted on the side of the ejection cylinder 22 by screws, and the length of the T-shaped bracket 33 is greater than the maximum stroke of the measuring piston rod 24 .

[0030] Two first guide wheels 34 are symmetrically mounted at the bottom of the T-shaped bracket 33. The first steel wire rope 31 passes over the first guide wheel 34 at the bottom of the T-shaped bracket 33 to ensure that the first steel wire rope 31 below the end of the measuring piston rod 24 remains in a vertical state.

[0031] The first guide wheel 34 is also rotatably mounted on the bottom of the side plate 12 and the edge of the press pit 6 , and the first steel wire rope 31 passes over the edge of the press pit 6 and the first guide wheel 34 at the bottom of the side plate 12 and extends to the outside of the hydraulic press base 1 .

[0032] The tensioning assembly includes a second steel wire rope 37 , one end of which is connected to the hook 352 , and the other end of which is connected to the counterweight assembly 39 .

[0033] One end of the second steel wire rope 37 passes through the hook 352 and is bent into a loop, and is fixed by a known steel wire rope fastener.

[0034] The counterweight assembly 39 can tighten the first steel rope 31 and the second steel rope 37 .

[0035] A plurality of second guide wheels 36 are provided in the middle of the second steel wire rope 37 , and the second guide wheels 36 are used to change the movement direction of the second steel wire rope 37 .

[0036] The second guide wheel 36 is rotatably mounted on the outer side of the side plate 12 via a rotating shaft.

[0037] It should be noted that the first steel wire rope 31 and the second steel wire rope 37 on both sides of the collision block 35 must be kept level.

[0038] The limit assembly 4 includes a mounting plate 41 , and a travel switch 49 is slidably mounted on the front side of the mounting plate 41 through a guide assembly. The sliding stroke of the travel switch 49 is the same as the maximum working stroke of the ejection cylinder 22 , and the collision block 35 is located directly below the travel switch 49 .

[0039] The mounting plate 41 is fixed to the front side of the side plate 12 by screws. The guide assembly includes a guide rail 44, which is parallel to the first steel wire rope 31 and the second steel wire rope 37 on both sides of the collision block 35. A slider 45 is slidably installed on the front side of the guide rail 44, and a travel switch 49 is fixed to the ground of the slider 45 by screws.

[0040] Pushing the slide block 45 to slide can change the position of the travel switch 49. The sector block 351 contacts the travel switch 49 and can send a signal, thereby controlling the ejection oil cylinder 22 to stop working.

[0041] The slider 45 is threadedly connected with a fixing screw 47 , one end of the fixing screw 47 passes through the slider 45 and abuts against the guide rail 44 , and the other end of the fixing screw 47 is fixedly connected with a hand wheel 48 .

[0042] The hand wheel 48 is turned to drive the fixed screw 47 to move, and when the fixed screw 47 abuts against the guide rail 44, the slider 45 can be fixed. When the fixed screw 47 is separated from the guide rail 44, the slider 45 can slide freely.

[0043] An adjustment scale 43 is etched on the front side of the mounting plate 41 and above the slider 45 . A reading plate 46 is fixed to the top of the slider 45 by screws. The reading plate 46 is triangular in shape, and the top of the reading plate 46 is located in the middle of the slider 45 .

[0044] The adjustment scale 43 degrees indicated by the reading plate 46 is the movement stroke of the piston rod 24 measured when the collision block 35 triggers the travel switch 49.

[0045] A limiting plate 42 is welded to the bottom of the mounting plate 41 , and the bottom surface of the sector block 351 abuts against the limiting plate 42 and can slide along the limiting plate 42 .

[0046] The limit plate 42 is parallel to the first steel wire rope 31 and the second steel wire rope 37 on both sides of the collision block 35. The limit plate 42 can prevent the fan-shaped block 351 from falling, ensure that the travel switch 49 can be correctly triggered, and avoid poor contact.

[0047] Adjustment component 5, adjustment component 5 is used to adjust the length of the lead-out component.

[0048] The adjustment assembly 5 includes two limiting guide wheels 51 , which are rotatably mounted on the outside of the hydraulic press base 1 , and the first steel wire rope 31 is slidably connected to the two limiting guide wheels 51 .

[0049] The line connecting the centers of the two limiting guide wheels 51 should be vertical, and the first steel wire rope 31 passes around the left sides of the two limiting guide wheels 51 .

[0050] An adjusting cylinder 54 is provided between the limiting guide wheels 51 , and the axis of the adjusting cylinder 54 is perpendicular to the first steel wire rope 31 between the limiting guide wheels 51 . The adjusting cylinder 54 is connected to the adjusting guide wheel 52 through an adjusting bracket 53 , and the first steel wire rope 31 passes between the adjusting bracket 53 and the adjusting guide wheel 52 .

[0051] The control adjustment oil cylinder 54 works and can drive the adjustment guide wheel 52 to move through the adjustment bracket 53, so that the first steel wire rope 31 between the limiting guide wheels 51 is bent, thereby changing the length of the first steel wire rope 31 between the limiting guide wheels 51.

[0052] In this embodiment, when the operator uses the device, he first calibrates the position of the collision block 35 .

[0053] Pushing the slider 45 drives the travel switch 49 to move to the far right, that is, the reading plate 46 points to the position where the adjustment scale 43 has the minimum reading.

[0054] The ejection oil cylinder 22 is controlled to work so that the measuring piston rod 24 is fully extended. Then the ejection oil cylinder 22 is stopped from working.

[0055] When the measuring piston rod 24 is extended, the collision block 35 moves to the right under the gravity of the counterweight assembly 39 .

[0056] If the length of the first steel wire rope 31 is increased, the collision block 35 will stop on the right side of the travel switch 49 . If the length of the first steel wire rope 31 is unchanged, the collision block 35 will stop directly below the travel switch 49 .

[0057] If the collision block 35 stops on the right side of the travel switch 49, the control cylinder 54 is operated to drive the adjusting guide wheel 52 to move to the right, thereby increasing the length of the first steel wire rope 31 between the limit guide wheels 51, thereby moving the collision block 35 to the left. When the collision block 35 triggers the travel switch 49, the travel switch 49 sends a signal, and the adjusting cylinder 54 stops working at this time, and the pressure is maintained to complete the calibration of the collision block 35.

[0058] Then adjust the position of the travel switch 49 according to the height of the workpiece.

[0059] Turn the hand wheel 48 to release the contact between the fixing screw 47 and the guide rail 44, push the slider 45 to slide, make the reading of the adjustment scale 43 indicated by the reading plate 46 the same as the workpiece height, and then tighten the fixing screw 47.

[0060] At this time, when the ejection cylinder 22 is working, the collision block 35 will move from right to left. When it collides with the travel switch 49, the movement stroke of the collision block 35 is the same as the movement stroke of the measuring piston rod 24.

[0061] Embodiment 2: See attached Figure 4-5 The counterweight assembly 39 includes a counterweight rod 391, a tray 392 is welded to the bottom of the counterweight rod 391, a second connecting sleeve 38 is threadedly connected to the top of the counterweight rod 391, and the second connecting sleeve 38 is clamped with the second wire rope 37. A plurality of counterweight blocks 393 are placed above the tray 392, and the counterweight rod 391 passes through all the counterweight blocks 393.

[0062] The counterweight block 393 can be a lead block. The counterweight block 393 is C-shaped as a whole, with a notch on one side, and the notches of the upper and lower counterweight blocks 393 are staggered.

[0063] When the device is not in use, the counterweight block 393 can be easily removed from the tray 392 to prevent the first steel wire rope 31 and the second steel wire rope 37 from being pulled for a long time and reduce the deformation of the first steel wire rope 31 and the second steel wire rope 37.

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A ejector cylinder limiting device, characterized in that: include: An ejection assembly (2), the ejection assembly (2) comprising an ejection oil cylinder (22), the ejection oil cylinder (22) being fixedly mounted on the bottom of the hydraulic press base (1), a working piston rod (23) and a measuring piston rod (24) being slidably mounted on both ends of the ejection oil cylinder (22), and the bottom end of the measuring piston rod (24) being connected to a transmission assembly (3); The transmission assembly (3) comprises a lead-out assembly and a tensioning assembly, a collision block (35) is provided between the lead-out assembly and the tensioning assembly, the lead-out assembly is connected to the measuring piston rod (24), and when the measuring piston rod (24) moves, the lead-out assembly can be used to drive the collision block (35) to move horizontally; A limit assembly (4), the limit assembly (4) comprising a mounting plate (41), a travel switch (49) being slidably mounted on the front side of the mounting plate (41) via a guide assembly, the sliding stroke of the travel switch (49) being the same as the maximum working stroke of the ejection cylinder (22), and the collision block (35) being located directly below the travel switch (49); An adjusting component (5), wherein the adjusting component (5) is used to adjust the length of the lead-out component.

2. The ejector cylinder limiting device according to claim 1, characterized in that: The collision block (35) is located outside the hydraulic press base (1), and the collision block (35) comprises a fan-shaped block (351). Hooks (352) are symmetrically provided on both sides of the fan-shaped block (351).

3. The ejector cylinder limiting device according to claim 2, characterized in that: The lead-out assembly comprises a first steel wire rope (31), one end of the first steel wire rope (31) being connected to the end of the measuring piston rod (24), and the other end of the first steel wire rope (31) being connected to a hook (352).

4. The ejector cylinder limiting device according to claim 3, characterized in that: A plurality of first guide wheels (34) are provided in the middle of the first steel wire rope (31), and the first guide wheels (34) are used to change the direction of the first steel wire rope (31).

5. The ejection cylinder limiting device according to claim 2, characterized in that: The tensioning assembly comprises a second steel wire rope (37), one end of the second steel wire rope (37) being connected to a hook (352) and the other end of the second steel wire rope being connected to a counterweight assembly (39).

6. The ejection cylinder limiting device according to claim 5, characterized in that: A plurality of second guide wheels (36) are provided in the middle of the second steel wire rope (37), and the second guide wheels (36) are used to change the movement direction of the second steel wire rope (37).

7. The ejector cylinder limiting device according to claim 2, characterized in that: A limiting plate (42) is provided at the bottom of the mounting plate (41), and the bottom surface of the sector block (351) abuts against the limiting plate (42) and is capable of sliding along the limiting plate (42).

8. The ejector cylinder limiting device according to claim 3, characterized in that: The adjustment assembly (5) comprises two position limiting guide wheels (51), the two position limiting guide wheels (51) being rotatably mounted outside the hydraulic press base (1), and the first steel wire rope (31) being slidably connected to the two position limiting guide wheels (51).

9. The ejector cylinder limiting device according to claim 8, characterized in that: An adjusting oil cylinder (54) is provided between the position-limiting guide wheels (51), the axis of the adjusting oil cylinder (54) being perpendicular to the first steel wire rope (31) between the position-limiting guide wheels (51), the adjusting oil cylinder (54) being connected to the adjusting guide wheels (52) via an adjusting bracket (53), and the first steel wire rope (31) passing between the adjusting bracket (53) and the adjusting guide wheels (52).

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