Guide roller structure of telescopic oil cylinder of crane

Abstract

A guide roller structure of a telescopic oil cylinder of a crane comprises a multi-stage suspension arm, an oil cylinder and a guide frame with a guide roller. An annular groove is circumferentially formed in the middle of the guide roller; a guide tongue plate is welded at the tail part of the rear section of arm at the joint of the adjacent lifting arms and extends forwards into the front section of arm, and a first guide inclined surface and a second guide inclined surface are respectively arranged at the front end and the rear end of the upper side of the guide tongue plate. And the width and the thickness of the guide tongue plate are respectively matched with the width and the depth of the annular groove. The guide roller groove is matched with the guide tongue plate with the inclined plane, so that stable transition is realized in the telescopic process of the oil cylinder, the collision and clamping stagnation of the guide frame at the joint of the arm tail are effectively avoided, and the operation stability and reliability are improved.

Description

Technical Field

[0001] This invention relates to a guide roller structure for a crane telescopic cylinder. Background Technology

[0002] The telescopic boom (see Chinese patent CN202310871531.7 for the structure) mainly uses a telescopic cylinder to extend and retract the boom. When the telescopic cylinder enters the tail of the telescopic boom, it needs to overcome the drop difference between the tail of the next boom section and the previous boom section before it can enter the interior of the boom.

[0003] The following defects exist in the operation of existing cranes: 1. When the hydraulic cylinder guide frame, carrying the telescopic hydraulic cylinder, enters the next section of the boom through the tail of the boom, it cannot enter smoothly at the step, which will produce a large impact sound and even cause jamming; 2. The impact force generated by the guide frame can easily damage the guide frame and cause malfunctions. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a crane telescopic cylinder guide roller structure. When the cylinder guide frame passes the boom tail through this device, it can move in and out smoothly, thus solving the problem of impact or jamming of the cylinder guide frame in the prior art.

[0005] To address the aforementioned technical problems, this invention provides a crane telescopic cylinder guide roller structure, comprising a multi-stage boom with inner and outer sleeves that slide against each other, a hydraulic cylinder inside the boom, a guide frame at the end of the cylinder, and guide rollers at the bottom of the guide frame.

[0006] The guide roller has an annular groove in the middle circumferential direction in the width direction;

[0007] In the multi-stage boom, at the junction of any adjacent preceding and following boom sections, a guide tongue plate is welded to the tail of each following boom section. The guide tongue plate is a long, horizontal strip that runs forward and backward. The width of the guide tongue plate matches the width of the annular groove. The rear part of the guide tongue plate is located inside the following boom section, and the front part of the guide tongue plate extends forward into the preceding boom section. A first guide slope with a lower front and a higher rear is provided on the upper side of the guide tongue plate near the front end, and a second guide slope with a lower rear and a higher front is provided on the upper side of the guide tongue plate near the rear end. The thickness of the guide tongue plate matches the depth of the annular groove.

[0008] Preferably, the width of the guide tongue plate at the position corresponding to the first guide slope is narrower at the front and wider at the back, and the width of the guide tongue plate at the position corresponding to the second guide slope is wider at the front and narrower at the back.

[0009] For the sake of simplicity, the crane telescopic cylinder guide roller structure described in this invention will be referred to as "this structure" in the following text.

[0010] The usage and advantages of this structure are as follows: When the guide frame moves from the front arm to the rear arm, the annular groove of the bottom guide roller first contacts the first guide ramp of the guide tongue plate, gradually lifting the guide frame. As the guide frame continues to move forward, the guide roller passes through the guide tongue plate and completely separates from the guide tongue plate via the second guide ramp, then contacts the bottom of the rear arm. Conversely, when the guide frame retracts from the rear arm to the front arm, the annular groove of the guide roller first slides onto the guide tongue plate via the second guide ramp, and then gradually lowers the guide frame via the first guide ramp until the outer circumference of the guide roller contacts the front arm, achieving a smooth exit. With this structure, the hydraulic cylinder guide frame can smoothly enter and exit when passing the arm tail, solving the problem of impact or jamming of the hydraulic cylinder guide frame in the prior art. Attached Figure Description

[0011] Figure 1 This is a structural schematic diagram of the guide roller body.

[0012] Figure 2 This is a schematic diagram of the guide tongue plate.

[0013] Figure 3 This is a schematic diagram of the structure of the guide frame about to enter the tail section of the next arm.

[0014] Figure 4 yes Figure 3 A magnified view of part A in the middle.

[0015] Figure 5 This is a schematic diagram of the guide frame passing through the tail of the next arm section.

[0016] Figure 6 This is a schematic diagram of the structure after the guide frame passes the tail of the next arm section. Detailed Implementation

[0017] See Figures 1-6 A crane telescopic cylinder guide roller structure includes a multi-stage boom with inner and outer sleeves that slide against each other. A cylinder 1 is installed inside the boom, a guide frame 2 is installed at the end of the cylinder 1, and guide rollers 3 are installed at the bottom of the guide frame 2.

[0018] The guide roller 3 has an annular groove 31 circumferentially located at the center of its width direction;

[0019] In the multi-stage boom, at the junction of any adjacent preceding boom 4 and following boom 5, a guide tongue plate 6 is welded to the tail of each following boom 5. The guide tongue plate 6 is a long, horizontal strip that runs back and forth. The width of the guide tongue plate 6 matches the width of the annular groove 31. The rear of the guide tongue plate 6 is located inside the following boom 5, and the front of the guide tongue plate 6 extends forward into the preceding boom 4. A first guide slope 61, which is lower at the front and higher at the rear, is provided on the upper side of the guide tongue plate 6 near the front end. A second guide slope 62, which is lower at the rear and higher at the front, is provided on the upper side of the guide tongue plate 6 near the rear end. The thickness of the guide tongue plate 6 matches the depth of the annular groove 31.

[0020] The guide tongue plate 6 has a width that is narrower at the front and wider at the back at the first guide slope 61, and the guide tongue plate 6 has a width that is wider at the front and narrower at the back at the second guide slope 62.

[0021] The usage and advantages of this structure are as follows: When the guide frame 2 moves from the front arm 4 to the rear arm 5, the annular groove 31 of the bottom guide roller 3 first contacts the first guide slope 61 of the guide tongue plate 6, gradually lifting the guide frame 2. The guide frame 2 continues to move forward, and after the guide roller 3 passes through the guide tongue plate 6 and completely separates from the guide tongue plate 6 from the second guide slope 62, the guide roller 3 contacts the bottom of the rear arm 5. Conversely, when the guide frame 2 retracts from the rear arm 5 back to the front arm 4, the annular groove 31 of the guide roller 3 first slides onto the guide tongue plate 6 through the second guide slope 62, and then gradually lowers the guide frame 2 through the first guide slope 61 until the guide roller 3 contacts the front arm 4 from the outside, achieving a smooth exit. With this structure, the guide frame 2 of the hydraulic cylinder 1 can smoothly enter and exit when passing the arm tail, solving the problem of impact or jamming of the guide frame 2 of the hydraulic cylinder 1 in the prior art.

Claims

1. A telescopic oil cylinder guide roller structure of a crane, comprising a plurality of stages of a telescopic boom which are sleeved and slidably connected with each other, an oil cylinder is arranged in the telescopic boom, a guide frame is arranged at an end of the oil cylinder, and a guide roller is arranged at a bottom of the guide frame, characterized in that: a circumferential annular groove is arranged at a middle part of the guide roller in a width direction of the guide roller; in the plurality of stages of the telescopic boom, a guide tongue plate is welded at a tail part of a rear stage of boom corresponding to a joint part of a front stage of boom and the rear stage of boom, the guide tongue plate is a long strip-shaped horizontal plate in a front-rear direction, a width of the guide tongue plate is matched with a width of the annular groove, the rear part of the guide tongue plate is located in the rear stage of boom, the front part of the guide tongue plate extends forward into the front stage of boom, a first guide inclined surface which is low in front and high in back is arranged at a front end of the guide tongue plate, a second guide inclined surface which is low in back and high in front is arranged at a rear end of the guide tongue plate, and a thickness of the guide tongue plate is matched with a depth of the annular groove. The width of the guide tongue plate corresponding to the first guide inclined surface is narrow in front and wide in back, and the width of the guide tongue plate corresponding to the second guide inclined surface is wide in front and narrow in back. ​ 2. A crane telescopic cylinder guide roller structure according to claim 1, characterized in that: ​

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