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CN-224226545-U - Limiting device for preventing limiting position from being pressed out of amplitude cylinder for crane

CN224226545UCN 224226545 UCN224226545 UCN 224226545UCN-224226545-U

Abstract

The utility model discloses a limiting device for preventing pressure holding at a limit position of a luffing cylinder for a crane, and relates to the technical field of cranes, comprising a turntable bracket, wherein a luffing arm mounting frame is arranged on the turntable bracket; the top of the amplitude arm mounting frame is provided with a limiter bracket at the left upper part of the arm shaft, the limiter bracket is provided with an amplitude limiter, and the upper side of the left end of the amplitude arm is provided with a triggering inclined plane. When the device is used, the amplitude variation oil cylinder stretches to push the right end of the amplitude variation arm to lift, when the amplitude variation oil cylinder stretches to the longest working state, the triggering inclined plane on the amplitude variation arm contacts the amplitude variation limiter, the amplitude variation limiter sends out a signal to limit the amplitude variation oil cylinder to stretch continuously, the condition that the amplitude variation oil cylinder runs to all stretching limit positions to generate pressure holding is prevented, and the false triggering of a moment limiting system is avoided.

Inventors

  • WANG LEI

Assignees

  • 韶关市起重机厂有限责任公司

Dates

Publication Date
20260512
Application Date
20250804

Claims (6)

  1. 1. The limiting device for preventing the limiting position of the luffing cylinder for the crane from being pressed out comprises a turntable support (2), wherein a luffing jib mounting frame (10) is mounted on the turntable support (2), and the top of the luffing jib mounting frame (10) is movably connected with the left end of a luffing jib (4) through a jib shaft (3), and the limiting device is characterized in that the turntable support (2) is movably connected with one end of a luffing cylinder (6), and the other end of the luffing cylinder (6) is movably connected with the right end of the luffing jib (4); The top of the amplitude variation arm mounting frame (10) is provided with a limiter bracket (11) at the left upper part of the arm shaft (3), the limiter bracket (11) is provided with an amplitude variation limiter, and the upper side of the left end of the amplitude variation arm (4) is provided with a triggering inclined plane (8).
  2. 2. The limiting device for preventing limiting position pressure holding of the luffing cylinder for the crane is characterized in that the luffing limiter comprises a limiting mounting plate (12), a displacement adjusting assembly and a proximity switch (15), the limiting mounting plate (12) is mounted on the top of the limiter bracket (11), the proximity switch (15) is mounted on the limiting mounting plate (12) through the displacement adjusting assembly, and the rear end of the proximity switch (15) is located on the left side of the triggering inclined plane (8).
  3. 3. The limiting device for preventing pressure holding at the limit position of the luffing cylinder for the crane according to claim 2, wherein the displacement adjusting assembly comprises an adjusting chute (13) and an adjusting nut (14), the adjusting chute (13) is arranged on the limiting mounting plate (12), the adjusting chute (13) is obliquely arranged in a left-low right-high mode, the front end of the proximity switch (15) penetrates through the adjusting chute (13), and the positions, located on the front side and the rear side of the limiting mounting plate (12), of the proximity switch (15) are respectively connected with the adjusting nut (14) in a threaded mode.
  4. 4. The limiting device for preventing pressure holding at the limit position of the luffing cylinder for the crane according to claim 1, further comprising an alarm mounting assembly and an alarm (18), wherein the side surface of the limiter bracket (11) is provided with the alarm (18) through the alarm mounting assembly.
  5. 5. The limiting device for preventing pressure holding at the limit position of the luffing cylinder for the crane according to claim 4, wherein the alarm mounting assembly comprises a screw (16) and an alarm support (17), the side surface of the limiter bracket (11) is fixedly connected with the alarm support (17) through the screw (16), and an alarm (18) is mounted at the top of the alarm support (17).
  6. 6. The limiting device for preventing limiting pressure of the amplitude cylinder for the crane from being suppressed in the limiting position is characterized by further comprising an installation box (19) and a controller (20), wherein the installation box (19) is arranged on the side face of the amplitude arm installation frame (10), and the controller (20) is installed in the installation box (19).

Description

Limiting device for preventing limiting position from being pressed out of amplitude cylinder for crane Technical Field The utility model relates to the technical field of cranes, in particular to a limiting device for preventing pressure from being held in a limit position of a luffing cylinder for a crane. Background The moment limiting system applied to the folding arm type crane at present needs to use a pressure sensor to measure the pressure value of the rodless cavity of the amplitude-variable oil cylinder, and then obtains the current moment value and the actual hoisting weight value through geometric relation operation. When the oil cylinder is in the limit position (namely the stroke of the oil cylinder is completely discharged), the condition of pressure holding can occur, and the pressure of the collected pressure sensor can be too high so as to falsely trigger moment alarm. Disclosure of utility model The utility model aims to overcome the existing defects, and provides a limiting device for preventing the limiting position from being blocked by pressure for the luffing cylinder of a crane, which prevents the luffing cylinder from running to the limiting position and stops moving before the luffing cylinder runs to the limiting position, so that the moment limiting alarm is prevented from being triggered by mistake, and the problems in the background art can be effectively solved. The limiting device for preventing the limiting position from being blocked by pressure for the luffing cylinder for the crane comprises a turntable support, wherein a luffing arm mounting frame is mounted on the turntable support, the top of the luffing arm mounting frame is movably connected with the left end of a luffing arm through an arm shaft, the turntable support is movably connected with one end of the luffing cylinder, and the other end of the luffing cylinder is movably connected with the right end of the luffing arm; the top of the amplitude variation arm mounting frame is provided with a limiter bracket at the left upper part of the arm shaft, the limiter bracket is provided with an amplitude variation limiter, and the upper side of the left end of the amplitude variation arm is provided with a triggering inclined plane. The amplitude-variable oil cylinder stretches to push the right end of the amplitude-variable arm to lift, when the amplitude-variable oil cylinder stretches to the longest working state, a triggering inclined plane on the amplitude-variable arm contacts with the amplitude-variable limiter, the amplitude-variable limiter sends out a signal to limit the amplitude-variable oil cylinder to stretch continuously, the situation that the amplitude-variable oil cylinder runs to all stretching limit positions to generate pressure holding is prevented, and therefore false triggering of an alarm by a moment limiting system is avoided. Further, the amplitude limiter comprises a limit mounting plate, a displacement adjusting assembly and a proximity switch, wherein the limit mounting plate is mounted at the top of the limiter bracket, the proximity switch is mounted on the limit mounting plate through the displacement adjusting assembly, and the rear end of the proximity switch is located on the left side of the triggering inclined plane. Further, the shift adjusting assembly comprises an adjusting chute and an adjusting nut, the limiting mounting plate is provided with the adjusting chute, the left side, the right side and the high side of the adjusting chute are obliquely arranged, the front end of the proximity switch penetrates through the adjusting chute, and the positions, located on the front side and the rear side of the limiting mounting plate, of the proximity switch are respectively connected with the adjusting nut in a threaded mode. The adjusting nut on the proximity switch is loosened, the position of the proximity switch in the adjusting chute can be adjusted, then the adjusting nut is tightened, and the proximity switch is fixed at a proper position on the limiting mounting plate again, so that the limiting position of amplitude variation of the amplitude variation arm can be adjusted, and the maximum limit of the extension distance of the amplitude variation oil cylinder can be adjusted. Further, the safety device also comprises an alarm mounting assembly and an alarm, wherein the side face of the limiter bracket is provided with the alarm through the alarm mounting assembly. When the inclined plane is triggered to contact the proximity switch, the alarm can give an alarm to remind a crane operator. Further, the alarm installation component comprises a screw and an alarm support, the side face of the limiter support is fixedly connected with the alarm support through the screw, and an alarm is installed at the top of the alarm support. The screw is used for fixedly mounting the alarm support, and the alarm support is used for supporting and mounting the alarm on the side face of the l