Device and method for measuring the amount of crane braking slide

Abstract

The present application relates to a device and method for measuring the amount of crane braking slippage, belonging to the field of crane detection technology. The device comprises a comparison rod and an indicator rod slidably mounted on the comparison rod. The end of the indicator rod facing away from the comparison rod is mounted on a standard weight, and the standard weight drives the indicator rod to slide along the length of the comparison rod. The measuring device also comprises a fixing member, which is used to fix the indicator rod to the comparison rod when the crane begins braking; a separating member, which is used to separate the indicator rod and the standard weight after the indicator rod is fixed to the comparison rod; a mounting plate slidably mounted on the comparison rod, which is used to correspond to the position of the standard weight after stopping due to braking and is aligned with the standard weight. A laser rangefinder is mounted on the mounting plate, which is used to face the indicator rod and emit a laser onto the indicator rod to measure the amount of crane braking slippage. The present application has the advantages of facilitating the measurement of crane braking slippage and improving measurement accuracy.

Description

Technical Field

[0001] The present application relates to the field of crane detection technology, and in particular to a device and method for measuring the amount of crane braking slippage. Background Art

[0002] The braking slippage of a crane's hoisting mechanism refers to the distance it slips from the moment the hoist's brakes are de-energized until the hoisted object (load) comes to a stop. This is a key indicator of the crane's braking performance. Excessive slippage not only affects the accuracy of heavy object positioning during production but, in severe cases, can lead to significant economic losses and serious casualties. Therefore, the braking slippage of a crane is a crucial indicator in crane safety performance testing and must be measured in actual production to ensure safe production.

[0003] Currently, there are three main methods for measuring the amount of crane braking slump (distance difference method, acceleration method, and rotary encoder method). The measurement principle of the distance difference method is to use wire sensors, ultrasonic sensors, laser ranging sensors, high-speed image capture and other sensors to obtain the height H1 of the crane at the start of braking and the height H2 at the stop of braking, and obtain the braking slump through the distance difference H1-H2.

[0004] However, when using the distance difference method for measurement, it is necessary to arrange more auxiliary equipment, such as (wire sensors, ultrasonic sensors, laser ranging sensors, high-speed image capture sensors, etc.), and then establish communication connections between the various sensors. After the communication connection, various debugging is required before relevant measurements can be performed; at the same time, during the measurement process, due to the use of more sensors and reliance on computers for distance conversion, the measurement data cannot be obtained intuitively. At the same time, in the process of distance conversion, it is easy to cause a large difference between the measured data and the actual data. At the same time, when measuring the height at the start of braking, there is a certain error when the high-speed image capture device obtains the position, resulting in a large error in the measured data. Summary of the Invention

[0005] In order to facilitate the measurement of the sliding amount and improve the measurement accuracy, the present application provides a crane braking sliding amount measurement device and method.

[0006] In the first aspect, the present application provides a crane braking slippage measurement device, which adopts the following technical solution:

[0007] A device for measuring the amount of downward movement during crane braking comprises a comparison rod and an indicator rod slidably mounted on the comparison rod. The comparison rod is vertically mounted on the ground and parallel to the load rope of the crane. The end of the indicator rod facing away from the comparison rod is mounted on a standard weight. The standard weight drives the indicator rod to slide along the length of the comparison rod. The measuring device further comprises a fixing member, which is used to fix the indicator rod to the comparison rod when the crane starts braking.

[0008] The measuring device further comprises a separating member, which is used to separate the indicating rod and the standard weight after the indicating rod is fixed on the comparison rod;

[0009] A mounting plate is slidably provided on the comparison rod, and the mounting plate slides along the length direction of the comparison rod. The mounting plate is used to correspond to the position of the standard weight after it stops due to braking and is on the same horizontal line as the standard weight. A laser rangefinder is provided on the mounting plate, and the laser rangefinder is used to face the indicator rod and emit laser to the indicator rod to measure the amount of sliding down due to braking of the crane.

[0010] Optionally, the fixing part includes multiple strands of steel wire rope, a mounting frame, connecting wires, an electromagnet and a micro generator, the electromagnet is in the shape of a long strip and is fixedly mounted on the comparison rod, the indicator rod is a metal rod adsorbed by the electromagnet, the multiple strands of the steel wire rope are used to hang standard weights on the crane hook, and the multiple strands of the steel wire rope are arranged in a pyramid shape at the corners of the standard weights, the mounting frame is located between the standard weights and the crane hook, the micro generator is arranged on the comparison rod, and a starting switch is provided in the mounting frame, the starting switch is electrically connected to the electromagnet and the micro generator through connecting wires, after the starting switch is turned on, the micro generator transmits alternating current to the electromagnet through the connecting wires to fix the indicator rod on the comparison rod, the fixing part also includes a starting part, which is used to press the starting switch to electrically connect the electromagnet when the crane starts braking.

[0011] The lifting mechanism comprises a lifting mechanism, a lifting mechanism, a lifting mechanism, a lifting mechanism of the lifting mechanism, and a lifting mechanism of the lifting mechanism. The lifting mechanism comprises a bottom end of the lifting mechanism, a bottom end of the lifting mechanism, and a bottom end of the lifting mechanism. The lifting mechanism comprises a spring, a push-pull mechanism, and a push-pull mechanism. The two lifting mechanisms are connected by a threaded connection to the lifting mechanism, and the two lifting mechanisms are connected by a threaded connection.

[0012] When the crane starts to brake, the crane brake clamp applies friction to the load rope reel and applies vertical upward pulling force to the standard weight. The force on the standard weight suddenly changes and the standard weight continues to fall under the action of inertia, causing the wire rope to stretch and elongate, thereby increasing the distance between the crane hook and the standard weight. The traction rope drives the mounting frame to descend, and the position of the blocking block above rises relatively, causing the two blocking blocks to separate. At the same time, the blocking block separates from the pressing block, and the driving member drives the pressing block to slide between the two pressing blocks and abut the starting switch.

[0013] Optionally, the driving member includes a first spring provided on the mounting frame, the pressing block is fixedly provided on the first spring, and the first spring drives the pressing block to have a movement tendency toward the starting switch.

[0014] Optionally, the separation member includes a fixed sleeve and a fixed rod, the fixed sleeve is arranged on the side of the standard weight and the axial direction is perpendicular to the side of the standard weight, the fixed rod is coaxially slidably inserted in the indicator rod, and the other end of the fixed rod is inserted in the fixed sleeve, the fixed rod is a metal rod and is adsorbed by the electromagnet, and when the electromagnet is energized, it adsorbs the fixed rod and drives the fixed rod back to the indicator rod to separate the fixed rod from the fixed sleeve.

[0015] Optionally, the separator also includes two layers of fixed plates arranged on the side of the standard weight, the two layers of fixed plates are arranged at intervals, the fixed sleeve is located between the two fixed plates and is in a separated state from the fixed plates, and a plurality of second springs are fixedly arranged on the outside of the fixed sleeve, the second springs are symmetrically arranged in the axial direction of the fixed sleeve and the ends are fixedly arranged on the fixed plate.

[0016] Optionally, the indicator rod includes a sliding seat slidably set on the comparison rod and a round rod fixedly set on the sliding seat, the round rod is hollow, the fixed rod is slidably sleeved in the round rod, the sliding seat is a metal seat adsorbed by the electromagnet, and a sliding hole coaxial with the round rod is opened on the sliding seat, and the fixed rod is adsorbed by the electromagnet through the sliding hole.

[0017] Optionally, a baffle is rotatably provided on the outer side of the round rod, and the center line of the baffle is sleeved on the round rod. When the indicator rod slides along the comparison rod, the baffle is in a vertical state. After the indicator rod is fixed on the comparison rod, the baffle is rotated 90° and is in a horizontal state, and the laser emitted by the laser rangefinder is directly projected onto the baffle.

[0018] Optionally, a laser pen is provided in the fixed sleeve, and the laser pen is coaxial with the fixed sleeve. The laser emitted by the laser pen is irradiated onto the contrast rod. The mounting plate is positioned by the light spot of the laser pen on the contrast rod. A positioning ring is provided at the end of the mounting plate facing away from the contrast rod, and the positioning ring is for the laser to pass through.

[0019] In a second aspect, the present application provides a method for measuring the amount of crane braking slippage, which adopts the following technical solutions:

[0020] Optionally, a method for measuring the amount of downward sliding caused by braking of a crane, using a device for measuring the amount of downward sliding caused by braking of a crane, further comprising:

[0021] S1: Set up the comparison rod, which is installed on one side of the crane hook. Slide the fixing rod out of the round rod and insert it into the fixing sleeve. Start the crane, and the crane drives the standard weight to rise to a certain height. Under the action of the fixing rod, the indicator rod slides along the comparison rod and rises.

[0022] S2: After the standard weight has risen to the required height, the crane lowers the standard weight at a constant speed and then brakes. After the crane brakes, the standard weight, under the action of inertia, stretches the wire rope and drives the mounting frame downward. The upper blocking block maintains the above position, causing the two blocking blocks to separate from each other. The pressing block separates from the blocking block, and the first spring drives the pressing block to slide and abut against the start switch. After the start switch is closed, the electromagnet is energized and fixes the indicator rod to the comparison rod, which is the position of the standard weight when the crane starts braking;

[0023] S3: After the electromagnet is activated, the electromagnet attracts the fixed rod, driving the fixed rod to move back into the round rod so that the fixed rod is separated from the fixed sleeve;

[0024] S4: After the standard weight comes to rest under the action of the braking force, turn on the laser pen, and the light emitted by the laser pen will be irradiated onto the comparison rod. Slide the mounting plate to the light spot position; turn the shielding plate to a horizontal state, and then install the laser rangefinder on the mounting plate;

[0025] S5: The light emitted by the laser rangefinder shines on the shielding plate, and the distance displayed by the laser rangefinder is the amount of the crane's braking descent.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. When measuring the braking distance of a crane, first set up a comparison rod on the ground so that the comparison rod is parallel to the length direction of the crane's load rope, then connect the indicator rod to the standard weight, then start the crane, and the crane drives the standard weight to rise to a certain height. At this time, the indicator rod and the standard weight are at the same height. Then, the crane lowers the standard weight at a constant speed and then brakes. At this time, under the action of the fixing part and the separating part, the fixing part fixes the indicator rod on the comparison rod, and the separating part separates the indicator rod from the standard weight. After the standard weight stops due to braking, the sliding mounting plate slides, and the mounting plate slides until it is at the same height as the standard weight. At this time, fix the laser rangefinder on the mounting plate, and the laser rangefinder transmitting end is at the same height as the standard weight. Then turn on the laser rangefinder, and the laser emitted by the laser rangefinder shines on the indicator rod. The value displayed on the laser rangefinder is the amount of decline caused by the crane braking. The operation is simple and convenient. At the same time, measuring the amount of decline caused by the crane braking with the laser rangefinder makes the measurement process more intuitive and the measurement data more accurate.

[0028] 2. The comparison rod is fixed to the ground, and the indicator rod is connected to the standard weight to position the standard weight laterally, thereby reducing the possibility of the standard weight shaking in the horizontal direction when it is lowered, thereby improving the accuracy of the crane braking slide test. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of a device for measuring the amount of braking slippage of a crane according to an embodiment of the present application;

[0030] Figure 2 This is a schematic structural diagram of an indicator rod in a device for measuring the amount of downward sliding of a crane during braking according to an embodiment of the present application;

[0031] Figure 3 This is a cross-sectional view of a comparison rod in a device for measuring the amount of downward sliding of a crane during braking according to an embodiment of the present application;

[0032] Figure 4 yes Figure 2 A magnified schematic diagram of part A;

[0033] Figure 5 This is a structural diagram of a separation component in a device for measuring the amount of downward sliding of a crane during braking according to an embodiment of the present application;

[0034] Figure 6 yes Figure 5 Schematic diagram of the enlarged portion B.

[0035] Description of reference numerals: 1. crane; 2. comparison rod;

[0036] 3. Indicator rod; 31. Sliding seat; 32. Round rod;

[0037] 4. Load rope;

[0038] 5. Fixing member; 51. Steel wire rope; 52. Mounting frame; 53. Connecting wire; 54. Electromagnet; 55. Micro generator; 56. Start switch; 57. Pull rope; 58. Blocking block; 59. Pressing block; 510. Driving spring; 511. First spring;

[0039] 6. Separator; 61. Fixed sleeve; 62. Fixed rod; 63. Fixed plate; 64. Second spring; 65.

[0040] 7. Mounting plate; 8. Laser rangefinder; 9. Mounting hole; 10. T-slot; 11. Standard weight; 12. Hook; 13. Slide hole; 14. Shielding plate; 15. Laser pointer. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1 -Attached Figure 6 This application is described in further detail.

[0042] The embodiment of the present application discloses a device for measuring the amount of downward movement of a crane during braking. Figure 1 The device for measuring the amount of downward movement of the crane during braking includes a comparison rod 2 and an indicator rod 3 slidably arranged on the comparison rod 2. The comparison rod 2 is vertically arranged on the ground and parallel to the load rope 4 of the crane 1. The end of the indicator rod 3 facing away from the comparison rod 2 is arranged on a standard weight 11. The standard weight 11 drives the indicator rod 3 to slide along the length direction of the comparison rod 2. The measuring device also includes a fixing member 5. The fixing member 5 is used to fix the indicator rod 3 to the comparison rod 2 when the crane 1 starts braking.

[0043] The measuring device further includes a separating member 6, which is used to separate the indicating rod 3 and the standard weight 11 after the indicating rod 3 is fixed to the comparison rod 2;

[0044] A mounting plate 7 is slidingly provided on the comparison rod 2, and the mounting plate 7 slides along the length direction of the comparison rod 2. The mounting plate 7 is used to correspond to the position of the standard weight 11 after it stops due to braking and is on the same horizontal line with the standard weight 11. A laser rangefinder 8 is provided on the mounting plate 7, and the laser rangefinder 8 is used to face the indicator rod 3 and emit a laser to the indicator rod 3 to measure the amount of sliding down when the crane is braked.

[0045] When measuring the braking distance of the crane 1, first set up the comparison rod 2 on the ground so that the comparison rod 2 is parallel to the length direction of the load rope 4 of the crane 1, then connect the indicator rod 3 to the standard weight 11, and then start the crane 1. The crane 1 drives the standard weight 11 to rise to a certain height. At this time, the indicator rod 3 and the standard weight 11 are at the same height. Then, the crane 1 lowers the standard weight 11 at a constant speed and then brakes. At this time, under the action of the fixing member 5 and the separating member 6, the fixing member 5 fixes the indicator rod 3 on the comparison rod 2, and the separating member 6 separates the indicator rod 3 from the standard weight 1 1 is separated, and after the standard weight 11 stops due to braking, the mounting plate 7 is slid. The mounting plate 7 slides until it is at the same height as the standard weight 11. At this time, the laser rangefinder 8 is fixed on the mounting plate 7, and the transmitting end of the laser rangefinder 8 is at the same height as the standard weight 11. Then the laser rangefinder 8 is turned on, and the laser emitted by the laser rangefinder 8 is irradiated to the indicator rod 3. The value displayed on the laser rangefinder 8 is the amount of the crane's braking decline. The operation is simple and convenient. At the same time, the laser rangefinder 8 is used to measure the amount of the crane's braking decline, which makes the measurement process more intuitive and the measurement data more accurate.

[0046] In the embodiment of the present application, a mounting hole 9 is provided at the vertical center line of the mounting plate 7, and the laser rangefinder 8 is inserted into the mounting hole 9. Furthermore, the laser emitting end of the laser rangefinder 8 is flush with the surface of the mounting plate 7; the cross-section of the comparison rod 2 is rectangular, and the surface of the comparison rod 2 facing the standard weight 11 is provided with a T-shaped slot 10, and the mounting plate 7 is slidably set in the T-shaped slot. Furthermore, a driving wheel and a micro motor are rotatably provided on the mounting plate 7, and the driving wheel is coaxially provided on the output shaft of the micro motor, and the driving wheel abuts against the bottom wall of the T-shaped slot 10, and the rotation axis of the driving wheel is perpendicular to the length direction of the comparison rod 2 and parallel to the ground; when measuring the height of the mounting plate 7, the micro motor is started, and the micro motor drives the driving wheel to rotate. The driving wheel rotates and moves along the comparison rod 2, thereby driving the mounting plate 7 to rise or fall, so that the mounting plate 7 and the standard weight 11 are at the same height, and the operation is simple and convenient.

[0047] In the embodiment of the present application, the fixing member 5 includes a multi-strand steel wire rope 51, a mounting frame 52, a connecting wire 53, an electromagnet 54 and a micro-generator 55. The electromagnet 54 is in a long strip shape and is fixedly mounted on the comparison rod 2. Further, the electromagnet 54 is fixedly mounted on the bottom wall of the T-shaped slot 10. The indicator rod 3 is a metal rod adsorbed by the electromagnet 54. The multi-strand steel wire rope 51 is used to hang the standard weight 11 to the hook 12 of the crane 1, and the multi-strand steel wire rope 51 is arranged in a pyramid shape at the corners of the standard weight 11. The mounting frame 52 is located between the standard weight 11 and the hook 12 of the crane 1. 2, and is located between the standard weight 11 and the hook 12 of the crane 1. The micro-generator 55 is arranged on the comparison rod 2. A starting switch 56 is provided in the mounting frame 52. The starting switch 56 is electrically connected to the electromagnet 54 and the micro-generator 55 through a connecting wire 53. When the starting switch 56 is turned on, the micro-generator 55 transmits AC power to the electromagnet 54 through the connecting wire 53 to fix the indicator rod 3 to the comparison rod 2. The fixing member 5 also includes a starting member. The starting member is used to press the starting switch 56 to electrically connect the electromagnet 54 when the crane 1 starts braking;

[0048] The starting member includes a traction rope 57, a blocking block 58, a pressing block 59 and a driving member. Two traction ropes 57 are provided and respectively penetrate into the mounting frame 52 from the top and bottom surfaces of the mounting frame 52 and are slidably arranged with the mounting frame 52. The ends of the traction rope 57 outside the mounting frame 52 are respectively fixed on the hook 12 of the crane 1 and the standard weight 11. Two blocking blocks 58 are provided and both are located in the mounting frame 52 and are respectively fixed at the ends of the traction rope 57. When the standard weight 11 is hoisted, the two blocking blocks 58 are stacked vertically and supported at the bottom of the mounting frame 52. The blocking block 58 at the bottom is fixed at the bottom of the mounting frame 52, and the upper blocking block 58 is fixed at the bottom of the mounting frame 52. A driving spring 510 is provided between the blocking block 58 and the top frame of the mounting frame 52. The driving spring 510 is sleeved on the traction rope 57 and drives the blocking block 58 to have a movement tendency to move toward the lower blocking block 58. The traction rope 57 is in a stretched state under the action of the driving spring 510. The pressing block 59 and the starting switch 56 are respectively located on both sides of the mounting frame 52 and are opposite to each other. The initial position of the pressing block 59 abuts against the side wall of the upper blocking block 58. The pressing block 59 is slidably provided on the side frame of the mounting frame 52 and slides toward the starting switch 56. The driving member is used to drive the pressing block 59 to slide toward the starting switch 56 and press the starting switch 56.

[0049] When the crane 1 starts braking, the brake hoop of the crane 1 applies friction to the reel of the load rope 4 and applies a vertical upward pulling force to the standard weight 11. The force on the standard weight 11 suddenly changes, and the standard weight 11 continues to fall under the action of inertia, causing the wire rope 51 to stretch and elongate, thereby increasing the distance between the crane 1 hook 12 and the standard weight 11. At this time, the traction rope 57 drives the mounting frame 52 to descend, and the position of the upper blocking block 58 rises relatively, causing the two blocking blocks 58 to separate. At the same time, the blocking block 58 separates from the pressing block 59. After the blocking block 58 separates from the pressing block 59, the driving member drives the pressing block 59 to slide between the two pressing blocks 59 and abut against the starting switch 56. After the starting switch 56 is turned on, the micro-generator 55 transmits AC power to the electromagnet 54 through the connecting wire 53. The electromagnet 54 fixes the indicator rod 3 to the comparison rod 2. At this time, the position of the indicator rod 3 is the position of the standard weight 11 when the crane 1 starts braking.

[0050] In an embodiment of the present application, the driving member includes a first spring 511 arranged on the mounting frame 52, and the pressing block 59 is fixedly arranged on the first spring 511. Furthermore, one end of the pressing block 59 is located outside the mounting frame 52, and the other end is located inside the mounting frame 52. The first spring 511 is sleeved on the pressing block 59 and fixedly arranged at the end of the pressing block 59. The first spring 511 drives the pressing block 59 to have a movement tendency toward the starting switch 56; when the upper blocking block 58 is separated from the lower blocking block 58, under the action of the first spring 511, the pressing block 59 is driven to pass through the two blocking blocks 58 and abut the starting switch 56, and the operation is simple and convenient.

[0051] In the embodiment of the present application, the separator 6 includes a fixed sleeve 61 and a fixed rod 62. The fixed sleeve 61 is arranged on the side of the standard weight 11 and the axial direction is perpendicular to the side of the standard weight 11. Furthermore, the fixed sleeve 61 is located at the center line of the side of the standard weight 11. The fixed rod 62 is coaxially slidably inserted in the indicator rod 3. The other end of the fixed rod 62 is inserted in the fixed sleeve 61. The fixed rod 62 is a metal rod and is adsorbed by the electromagnet 54. After the electromagnet 54 is energized, it adsorbs the fixed rod 62 and drives the fixed rod 62 back to the indicator rod 3 to fix it. The rod 62 is separated from the fixed sleeve 61; when the starting switch 56 is turned on, the electromagnet 54 is electrically connected to the micro generator 55, and the indicator rod 3 is fixed. At the same time, under the action of the electromagnet 54, the fixed rod 62 moves toward the inside of the indicator rod 3, so that the fixed rod 62 is disengaged from the fixed sleeve 61, thereby separating the indicator rod 3 from the standard weight 11. The operation is simple and convenient. At the same time, under the action of the electromagnet 54, the indicator rod 3 is disengaged, the fixed rod 62 and the fixed sleeve 61 are separated at the same time, which facilitates the standard weight 11 to slide down.

[0052] In the implementation of this application, in order to facilitate the fixing rod 62 to slide out of the fixing sleeve 61, the separator 6 also includes two layers of fixing plates 63 arranged on the side of the standard weight 11. The two layers of fixing plates 63 are arranged at intervals and arranged up and down. The fixing sleeve 61 is located between the two fixing plates 63 and is in a separated state with the fixing plates 63. A plurality of second springs 64 are fixedly arranged on the outside of the fixing sleeve 61. The second springs 64 are arranged symmetrically in the axial direction of the fixing sleeve 61 and the ends are fixed on the fixing plates 63; the separation of the fixing plates 63 from the fixing sleeve 61 reduces the possibility of the fixing rod 62 being stuck in the fixing sleeve 61 due to the descent of the standard weight 11, thereby facilitating the fixing rod 62 to slide out of the fixing sleeve 61; under the action of the second spring 64, the fixing sleeve 61 has a certain amount of activity between the two layers of fixing plates 63, which facilitates the fixing rod 62 to move out of the fixing sleeve 61.

[0053] In the embodiment of the present application, the indicator rod 3 includes a sliding seat 31 slidably arranged on the comparison rod 2 and a round rod 32 fixedly arranged on the sliding seat 31. The sliding seat 31 is slidably arranged in the T-shaped slot 10, the round rod 32 is hollow, and the fixed rod 62 is slidably sleeved in the round rod 32. The sliding seat 31 is a metal seat adsorbed by the electromagnet 54. A sliding hole 13 coaxial with the round rod 32 is opened on the sliding seat 31. The fixed rod 62 is adsorbed by the electromagnet 54 through the sliding hole 13; when the electromagnet 54 is energized, the electromagnet 54 adsorbs the fixed rod 62, and the fixed rod 62 slides in the round rod 32 under the action of suction, and the fixed rod 62 is adsorbed on the electromagnet 54 through the sliding hole 13, which is simple and convenient to operate.

[0054] In the embodiment of the present application, to facilitate the laser light emitted by the laser rangefinder 8 to illuminate the indicator rod 3, a shielding plate 14 is rotatably mounted on the outer side of the round rod 32. The centerline of the shielding plate 14 is sleeved onto the round rod 32. When the indicator rod 3 slides along the comparison rod 2, the shielding plate 14 is vertical, reducing air resistance as the shielding plate 14 descends. After the indicator rod 3 is fixed to the comparison rod 2, the shielding plate 14 rotates 90 degrees to a horizontal position, allowing the laser light emitted by the laser rangefinder 8 to directly illuminate the shielding plate 14. The shielding plate 14 facilitates the laser light emitted by the laser rangefinder 8 to illuminate the shielding plate 14, thereby facilitating the laser rangefinder 8 to measure the amount of downward movement during crane braking. Furthermore, an adjustment motor is fixed to the round rod 32. The output shaft of the adjustment motor is perpendicular to the axis of the round rod 32. The adjustment wheel is mounted on the output shaft of the adjustment motor, which abuts the edge of the shielding plate 14. When the adjustment motor is activated, it drives the adjustment wheel to rotate, which in turn drives the shielding plate 14, making operation simple and convenient.

[0055] In an embodiment of the present application, a laser pen 15 is provided in the fixed sleeve 61, and the laser pen 15 is coaxial with the fixed sleeve 61. The laser emitted by the laser pen 15 is irradiated onto the comparison rod 2, and the mounting plate 7 is positioned with the light spot of the laser pen 15 on the comparison rod 2. Furthermore, a positioning ring is provided at the end of the mounting plate 7 facing away from the comparison rod 2, and the positioning ring is for the laser to pass through; when the standard weight 11 is stationary due to braking, the laser pen 15 is turned on, and the light emitted by the laser pen 15 is irradiated onto the comparison rod 2, and then the mounting plate 7 is slid. When the light passes through the positioning ring, the mounting plate 7 is fixed in the above position, thereby improving the positioning accuracy of the mounting plate 7, thereby improving the measurement accuracy of the braking sliding amount of the crane.

[0056] The implementation principle of the crane braking slippage measurement device in the embodiment of the present application is as follows:

[0057] When measuring the braking distance of the crane 1, first set up the comparison rod 2 on the ground so that the comparison rod 2 is parallel to the length of the load rope 4 of the crane 1. Then connect the indicator rod 3 to the standard weight 11. Then start the crane 1, and the crane 1 drives the standard weight 11 to a certain height. At this time, the indicator rod 3 and the standard weight 11 are at the same height.

[0058] The crane 1 then lowers the standard weight 11 at a constant speed and brakes. The brake hoop of the crane 1 applies friction to the reel of the load rope 4, thereby applying a vertical upward pulling force to the standard weight 11. The force on the standard weight 11 suddenly changes, and the standard weight 11 continues to fall under the action of inertia, causing the wire rope 51 to stretch and elongate, thereby increasing the distance between the hook 12 of the crane 1 and the standard weight 11. At this time, the traction rope 57 drives the mounting frame 52 to descend, and the upper blocking block 58 rises relatively, causing the two blocking blocks 58 to separate. At the same time, the blocking block 58 separates from the pressing block 59. After the blocking block 58 separates from the pressing block 59, the driving member drives the pressing block 59 to slide between the two pressing blocks 59 and abut against the starting switch 56. After the starting switch 56 is turned on, the micro-generator 55 transmits AC power to the electromagnet 54 through the connecting wire 53. The electromagnet 54 fixes the indicator rod 3 to the comparison rod 2. At this time, the position of the indicator rod 3 is the position of the standard weight 11 when the crane 1 starts braking.

[0059] When the standard weight 11 is stationary, turn on the laser pen 15, and the light emitted by the laser pen 15 is irradiated onto the comparison rod 2. Then slide the mounting plate 7. When the light passes through the positioning ring, fix the mounting plate 7 in the above position. Then turn on the laser rangefinder 8, and the laser emitted by the laser rangefinder 8 is irradiated onto the indicator rod 3. The value displayed on the laser rangefinder 8 is the amount of decline of the crane brake. The operation is simple and convenient.

[0060] The embodiment of the present application discloses a method for measuring the amount of downward sliding of a crane during braking, using a device for measuring the amount of downward sliding of a crane during braking, and further comprising:

[0061] S1: Set up the comparison rod 2 on one side of the hook of the crane 1, slide the fixing rod 62 out of the round rod 32 and insert it into the fixing sleeve 61, start the crane 1, and the crane 1 drives the standard weight 11 to rise to a certain height. Under the action of the fixing rod 62, the indicator rod 3 slides along the comparison rod 2 and rises;

[0062] S2: After the standard weight 11 rises to the required height, the crane 1 lowers the standard weight 11 at a constant speed and then brakes. After the crane brakes, the standard weight 11 drives the wire rope 51 to stretch and elongate under the action of inertia, driving the mounting frame 52 downward. The upper blocking block 58 maintains the above position, causing the two blocking blocks 58 to separate from each other, and the pressing block 59 to separate from the blocking block 58. The first spring 511 drives the pressing block 59 to slide and abut against the start switch 56. After the start switch 56 is closed, the electromagnet 54 is energized to fix the indicator rod 3 on the comparison rod 2, that is, the position of the standard weight 11 when the crane 1 starts braking;

[0063] S3: After the electromagnet 54 is activated, the electromagnet 54 attracts the fixing rod 62, driving the fixing rod 62 to move back into the round rod 32 so that the fixing rod 62 is separated from the fixing sleeve 61;

[0064] S4: After the standard weight 11 comes to rest under the action of the braking force, the laser pen 15 is turned on, and the light emitted by the laser pen 15 is irradiated onto the comparison rod 2. The mounting plate 7 is slid to the light spot position; the shielding plate 14 is rotated to a horizontal state, and then the laser rangefinder 8 is installed on the mounting plate 7;

[0065] S5: The light emitted by the laser rangefinder 8 is irradiated on the shielding plate 14, and the distance displayed by the laser rangefinder 8 is the amount of the crane's braking descent.

[0066] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A device for measuring the amount of downward movement of a crane during braking, characterized in that: The measuring device comprises a comparison rod (2) and an indicator rod (3) slidably arranged on the comparison rod (2); the comparison rod (2) is vertically arranged on the ground and parallel to the load rope (4) of the crane (1); the end of the indicator rod (3) facing away from the comparison rod (2) is arranged on a standard weight (11); the standard weight (11) drives the indicator rod (3) to slide along the length direction of the comparison rod (2); and the measuring device further comprises a fixing member (5); the fixing member (5) is used to fix the indicator rod (3) to the comparison rod (2) when the crane (1) starts braking; The measuring device further comprises a separating member (6) for separating the indicating rod (3) and the standard weight (11) after the indicating rod (3) is fixed on the comparison rod (2); A mounting plate (7) is slidably provided on the comparison rod (2), and the mounting plate (7) slides along the length direction of the comparison rod (2). The mounting plate (7) is used to correspond to the position of the standard weight (11) after stopping due to braking and is on the same horizontal line as the standard weight (11). A laser rangefinder (8) is provided on the mounting plate (7), and the laser rangefinder (8) is used to face the indicator rod (3) and emit laser light to the indicator rod (3) to measure the amount of downward movement of the crane due to braking.

2. The device for measuring the amount of downward sliding of a crane under braking according to claim 1, characterized in that: The fixing member (5) comprises a plurality of steel wire ropes (51), a mounting frame (52), a connecting wire (53), an electromagnet (54) and a micro generator (55). The electromagnet (54) is in a long strip shape and is fixedly arranged on the comparison rod (2). The indicator rod (3) is a metal rod adsorbed by the electromagnet (54). The plurality of steel wire ropes (51) are used to suspend the standard weight (11) to the hook (12) of the crane (1). The plurality of steel wire ropes (51) are arranged in a pyramid shape at the corners of the standard weight (11). The mounting frame (52) is located between the standard weight (11) and the hook (12) of the crane (1). The micro-generator (55) is arranged on the comparison rod (2), and a starting switch (56) is arranged in the installation frame (52). The starting switch (56) is electrically connected to the electromagnet (54) and the micro-generator (55) through a connecting wire (53). After the starting switch (56) is turned on, the micro-generator (55) transmits alternating current to the electromagnet (54) through the connecting wire (53) to fix the indicator rod (3) on the comparison rod (2). The fixing member (5) also includes a starting member. The starting member is used to press the starting switch (56) to electrically connect the electromagnet (54) when the crane (1) starts braking.

3. The device for measuring the amount of downward sliding of a crane under braking according to claim 2, characterized in that: The starting member includes a traction rope (57), a blocking block (58), a pressing block (59) and a driving member. Two traction ropes (57) are provided and respectively penetrate into the installation frame (52) from the top surface and the bottom surface of the installation frame (52) and are slidably arranged with the installation frame (52). The ends of the traction rope (57) located outside the installation frame (52) are respectively fixed on the hook (12) of the crane (1) and the standard weight (11). Two blocking blocks (58) are provided and both are located in the installation frame (52) and are respectively fixed on the ends of the traction rope (57). When the standard weight (11) is hoisted, the two blocking blocks (58) are stacked vertically and supported on the bottom of the installation frame (52). The blocking block (58) located at the bottom is fixed on the installation frame (52). A driving spring (510) is provided between the bottom and upper blocking block (58) and the top frame of the installation frame (52). The driving spring (510) is sleeved on the traction rope (57) and drives the blocking block (58) to have a movement tendency toward the lower blocking block (58). The traction rope (57) is in a stretched state. The pressing block (59) and the starting switch (56) are respectively located on both sides of the installation frame (52) and face each other. The initial position of the pressing block (59) abuts against the side wall of the upper blocking block (58). The pressing block (59) is slidably provided on the side frame of the installation frame (52) and slides toward the starting switch (56). The driving member is used to drive the pressing block (59) to slide toward the starting switch (56) and press the starting switch (56); When the crane (1) starts braking, the brake hoop of the crane (1) applies friction to the reel of the load rope (4) and applies a vertical upward pulling force to the standard weight (11). The force on the standard weight (11) suddenly changes, and the standard weight (11) continues to fall under the action of inertia, causing the steel wire rope (51) to stretch and elongate, thereby increasing the distance between the crane (1) hook (12) and the standard weight (11). The traction rope (57) drives the installation frame (52) to descend, and the position of the upper blocking block (58) rises relatively, causing the two blocking blocks (58) to separate. At the same time, the blocking block (58) separates from the pressing block (59), and the driving member drives the pressing block (59) to slide between the two pressing blocks (59) and abut against the start switch (56).

4. The device for measuring the amount of downward sliding of a crane under braking according to claim 3, characterized in that: The driving member includes a first spring (511) arranged on the mounting frame (52), the pressing block (59) is fixedly arranged on the first spring (511), and the first spring (511) drives the pressing block (59) to have a movement tendency toward the starting switch (56).

5. The device for measuring the amount of downward sliding of a crane under braking according to claim 4, characterized in that: The separating member (6) comprises a fixing sleeve (61) and a fixing rod (62). The fixing sleeve (61) is arranged on the side of the standard weight (11) and its axis direction is perpendicular to the side of the standard weight (11). The fixing rod (62) is coaxially slidably inserted into the indicating rod (3). The other end of the fixing rod (62) is inserted into the fixing sleeve (61). The fixing rod (62) is a metal rod and is adsorbed by the electromagnet (54). When the electromagnet (54) is energized, it adsorbs the fixing rod (62) and drives the fixing rod (62) to move back into the indicating rod (3) so that the fixing rod (62) is separated from the fixing sleeve (61).

6. The device for measuring the amount of downward sliding of a crane under braking according to claim 5, characterized in that: The separating member (6) further comprises two layers of fixing plates (63) arranged on the side of the standard weight (11), the two layers of fixing plates (63) being arranged at intervals, the fixing sleeve (61) being located between the two fixing plates (63) and being in a separated state from the fixing plates (63), a plurality of second springs (64) being fixedly arranged on the outside of the fixing sleeve (61), the second springs (64) being symmetrically arranged in the axial direction of the fixing sleeve (61) and the ends of the second springs being fixedly arranged on the fixing plates (63).

7. The device for measuring the amount of downward sliding of a crane under braking according to claim 6, characterized in that: The indicating rod (3) comprises a sliding seat (31) slidably arranged on the comparison rod (2) and a round rod (32) fixedly arranged on the sliding seat (31); the round rod (32) is hollow; the fixed rod (62) is slidably sleeved in the round rod (32); the sliding seat (31) is a metal seat adsorbed by the electromagnet (54); a sliding hole (13) coaxial with the round rod (32) is provided on the sliding seat (31); the fixed rod (62) is adsorbed by the electromagnet (54) through the sliding hole (13).

8. The device for measuring the amount of downward sliding of a crane under braking according to claim 7, characterized in that: A shielding plate (14) is rotatably provided on the outer side of the round rod (32), and the center line of the shielding plate (14) is sleeved on the round rod (32). When the indicator rod (3) slides along the comparison rod (2), the shielding plate (14) is in a vertical state. After the indicator rod (3) is fixed on the comparison rod (2), the shielding plate (14) rotates 90 degrees and is in a horizontal state. The laser emitted by the laser rangefinder (8) is directly projected onto the shielding plate (14).

9. The device for measuring the amount of downward sliding of a crane under braking according to claim 8, characterized in that: A laser pen (15) is provided in the fixed sleeve (61), the laser pen (15) being coaxial with the fixed sleeve (61), the laser emitted by the laser pen (15) irradiating the contrast rod (2), the mounting plate (7) being positioned by the light spot of the laser pen (15) on the contrast rod (2), and a positioning ring being provided at the end of the mounting plate (7) facing away from the contrast rod (2), the positioning ring being for the laser to pass through.

10. A method for measuring the amount of downward sliding during a crane braking operation, using the device for measuring the amount of downward sliding during a crane braking operation according to claim 9, characterized in that: Also includes; S1: erecting a comparison rod (2), erecting the comparison rod (2) on one side of the hook of the crane (1), sliding the fixing rod (62) out of the round rod (32) and inserting it into the fixing sleeve (61), starting the crane (1), and the crane (1) drives the standard weight (11) to rise to a certain height. Under the action of the fixing rod (62), the indicating rod (3) is driven to slide along the comparison rod (2) and rise; S2: After the standard weight (11) rises to the required height, the crane (1) lowers the standard weight (11) at a uniform speed and then brakes. After the crane brakes, the standard weight (11) drives the wire rope (51) to stretch and extend under the action of inertia, thereby driving the mounting frame (52) to move downward. The blocking block (58) located above maintains the above position and the two blocking blocks (58) are separated from each other. The pressing block (59) is separated from the blocking block (58). The first spring (511) drives the pressing block (59) to slide and abut against the start switch (56). After the start switch (56) is closed, the electromagnet (54) is energized and the indicator rod (3) is fixed on the comparison rod (2), that is, the position of the standard weight (11) when the crane (1) starts to brake. S3: After the electromagnet (54) is started, the electromagnet (54) adsorbs the fixed rod (62), driving the fixed rod (62) to move back into the round rod (32) so that the fixed rod (62) is separated from the fixed sleeve (61); S4: After the standard weight (11) is stationary under the action of the braking force, the laser pen (15) is turned on, the light emitted by the laser pen (15) is irradiated to the comparison rod (2), and the mounting plate (7) is slid to the position of the light spot; the shielding plate (14) is rotated to a horizontal state, and then the laser rangefinder (8) is installed on the mounting plate (7); S5: The light emitted by the laser rangefinder (8) is irradiated on the shielding plate (14), and the distance displayed by the laser rangefinder (8) is the amount of the crane's braking descent.

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