Braking distance detection device and method for hoisting mechanism on crane

Abstract

The present invention relates to a device and method for detecting the braking distance of a lifting mechanism on a crane, wherein the bottom end of the pillar is connected to the front of the bottom plate through a base and bolts, and the four corners of the back of the bottom plate are equipped with walking wheels, and the top of the pillar is connected to an outwardly extending lifting arm, and one end of the lower rope of the wire rope passes through the inner cavity of the pillar, and the rope is taken out from the top of the pillar, passes around the pulley, and hangs freely through the guide wheel. The end of the wire rope is clamped by a wire rope clamp to hold a heavy object block, and a dial indicator is embedded in one surface of the pillar, and the measuring rod on the dial indicator touches the dial indicator scale, and the dial indicator scale is fixed on the guide slider, and an action switch is fixed to the back of the pillar dial indicator installation by bolts, and one end of the roller on the action switch contacts the upper end of the switch scale through a rotating shaft. The present invention and the crane lifting mechanism adopt interlocking control to ensure the authenticity and synchronization of the switch action and the braking of the lifting mechanism brake; the action is sensitive and the measurement accuracy is high, so that the measurement value is more accurate.

Description

Technical Field

[0001] The invention relates to a braking distance detection device for a hoisting mechanism on a crane, which is particularly suitable for detecting various performances of crane mechanisms of various tonnages and various speed control modes. Background Art

[0002] Most cranes will test the performance of the hoisting mechanism before they are put into use to ensure that the crane meets the design requirements and usage requirements. One of the tests is to measure the braking distance of the hoisting mechanism. With the continuous development of control systems, the braking distance of the crane hoisting mechanism is getting smaller and smaller. The previous visual measurement method has an increasing error and can no longer meet the needs of braking distance measurement. Summary of the invention

[0003] The task of the present invention is to provide a device and method for detecting the braking distance of a hoisting mechanism on a crane, which is more convenient, accurate and reliable.

[0004] The task of the present invention is accomplished in this way, and it is characterized in that: it includes a pillar, and the bottom end of the pillar is connected to the front of the base plate through the base and bolts, the four corners of the back of the base plate are equipped with walking wheels, and the top of the pillar is connected to a lifting arm extending outward, and one end of the lower rope of the wire rope passes through the inner cavity of the pillar and comes out from the top of the pillar, passes around the pulley and hangs freely through the guide wheel, the end of the wire rope is clamped by a wire rope clamp to hold a heavy block, and a dial indicator is embedded in one surface of the pillar, and the measuring rod on the dial indicator touches the dial indicator scale, and the dial indicator scale is fixed on the guide slider, the guide slider is assembled with the inner cavity of the pillar and can drive the dial indicator scale to move up and down on the pillar, and an action switch is fixed with bolts on the back of the pillar dial indicator installation, one end of the roller on the action switch contacts with the upper end of the switch scale through a rotating shaft, and the lower end of the switch scale is equipped with an L-shaped plate assembled with the guide slider in the inner cavity of the pillar.

[0005] The support is made of rectangular steel, and the four surfaces of the rectangular steel at the bottom of the support are respectively welded to one end of the reinforcing rib plate, and the other end of the reinforcing rib plate is welded to the base to form a stable support frame.

[0006] The lifting arm is connected to the top end of the pillar by welding. Furthermore, a triangular plate is provided at a 90° angle between the welding end of the lifting arm and the pillar, one end of the triangular plate is welded to the pillar, and the other end of the triangular plate is welded to the lifting arm.

[0007] The pulley is installed at the connection between the lifting arm and the top of the support, the shaft passes through the center of the guide wheel, and the two ends of the shaft are fixed on the wheel frame and fixed to the lifting arm through fastening bolts.

[0008] The guide wheel is embedded in the extension end of the telescopic arm, the center of the guide wheel passes through the shaft, and both ends of the shaft are fixed on the wheel frame and fixed to the boom through fastening bolts.

[0009] The lower rope end of the steel wire rope is connected with the guide slider in the inner cavity of the pillar by a steel wire rope clamp, and moves up and down in the inner cavity of the pillar along with the guide slider.

[0010] The guide slide block is a block-shaped structure, and threaded holes are arranged on four vertical surfaces thereof for installing a dial indicator striker and a switch striker.

[0011] The dial indicator striker is a block-shaped structure with a flat surface on the upper part and a mounting hole on the lower part for assembling the dial indicator striker on the guide slider. The switch striker is a long plate-like object with an L-shaped plate connected to its lower end. The contact end of the switch striker and the action switch roller is folded upward at 45°.

[0012] The following steps are included when using the detection device for detection:

[0013] ⑴. First, electrically connect the action switch to the crane hoisting mechanism control unit and power it on;

[0014] ⑵. Manually raise the weight block so that the switch striker moves down with the guide slider and separates from the action switch roller;

[0015] ⑶. Manually lower the weight slowly to make the switch striker contact with the action switch roller and trigger the action switch. When you hear the "click" sound of the action switch disconnecting, record the percentage value a;

[0016] ⑷. According to the position of the weight at the test site, adjust the length of the wire rope at the end of the device weight block, so as to adjust the position of the weight block. Before the action switch is actuated, the device weight block is placed on the upper part of the weight, and the device guide slide (diameter indicator impact ruler) is located below the dial indicator measuring rod;

[0017] ⑸. Install the device correctly; the test crane lifts the rated load weight, lifts 200-300mm, and then slowly lowers it. After the action switch is actuated, the chain reaction of the test crane is triggered, and the weight stops descending. The tester records the percentage indicator number b at this time; the crane hoisting mechanism acts (rises), repeats the above actions at least 3 times, and records the corresponding value of the dial indicator;

[0018] ⑹. Take the arithmetic mean of the measured data |ba| as the braking distance detection value of the test bridge crane hoisting mechanism.

[0019] The present invention has the following effects:

[0020] 1. The present invention and the crane hoisting mechanism adopt interlocking control to ensure the authenticity and synchronization of the switch action and the braking of the hoisting mechanism brake;

[0021] 2. The present invention adopts a dial indicator as a measuring tool, which has sensitive action and high measurement accuracy, making the measured value more accurate and more convincing;

[0022] 3. The final value of the present invention adopts the difference between two readings of the dial gauge as the measured value, which saves the work of zeroing the dial gauge in the early stage, and reduces the requirements for the installation accuracy of the device itself, making the device more convenient to use;

[0023] 4. The present invention adopts movable pillars as carriers, which facilitates the flexible movement of measurement personnel;

[0024] 5. The present invention has a compact structure, simple process, easy manufacture, convenient use, high measurement accuracy, and can measure the braking distance of lifting mechanisms of various weight specifications and speed control modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 Schematic diagram of the structure in which the rotating support rotates 90°; Figure 3 This is an enlarged view of the structure of the dial indicator. Figure 4 It is an enlarged view of the action switch structure; Figure 5 It is a schematic diagram of the structure of a heavy block.

[0026] Description of the drawings: 1. Pillar, 2. Guide slider, 3. Dial indicator, 4. Dial indicator, 5. Wire rope, 6. Wire rope clamp, 7. Weight block, 8. Action switch, 9. Switch striker, 10. Base, 11. Bottom plate, 12. Travel wheel, 13. Reinforcement plate, 14. Lifting arm, 15. Pulley, 16. Guide wheel, 17. Measuring rod, 18. Roller, 19. L-shaped plate, 20. Threaded hole. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0028] Specific implementation examples Figure 1 and Figure 2As shown, the braking distance detection device includes a pillar 1, and the bottom end of the pillar is connected to the front of the base plate 11 through the base 10 and bolts, and the four corners of the back of the base plate are equipped with walking wheels 12, and the top of the base is connected to a lifting arm 14 extending outward, and one end of the lower rope of the wire rope 5 passes through the inner cavity of the pillar and goes out from the top of the pillar to pass around the pulley 15 and hang freely through the guide wheel 16, and the end of the wire rope is clamped by a heavy block 7 by the wire rope head 6, and a dial indicator 4 is embedded in one surface of the pillar, and the measuring rod 17 on the dial indicator is in contact with the dial indicator impact ruler 3, and the dial indicator impact ruler 9 is fixed on the guide slider 2, the guide slider 2 is assembled with the inner cavity of the pillar and can drive the dial indicator impact ruler to move up and down on the pillar, and an action switch 8 is fixed to the back of the pillar dial indicator installation by bolts, and one end of the roller 18 on the action switch is in contact with the upper end of the switch impact ruler 9 through a rotating shaft, and the lower end of the switch impact ruler is equipped with an L-shaped plate 19 assembled with the guide slider 2 in the inner wall of the pillar.

[0029] The pillar is made of rectangular steel, and the four surfaces of the rectangular steel at the bottom of the pillar are respectively welded to one end of the reinforcing rib plate 13, and the other end of the reinforcing rib plate is welded to the base to form a stable pillar frame.

[0030] The lifting arm 14 is connected to one end of the top of the pillar by welding. Furthermore, a triangular plate is provided at a 90° angle between the welding end of the lifting arm and the pillar, one end of the triangular plate is welded to the pillar, and the other end of the triangular plate is welded to the lifting arm.

[0031] The pulley 15 is installed at the connection between the lifting arm and the top of the support. The center of the guide wheel passes through the shaft, and both ends of the shaft are fixed on the wheel frame and fixed to the lifting arm through fastening bolts.

[0032] The guide wheel 16 is embedded in the extension end of the telescopic arm, and the center of the guide wheel passes through the shaft. Both ends of the shaft are fixed on the wheel frame and fixed to the boom by fastening bolts.

[0033] One end of the steel wire rope is connected to the guide slider 2 in the inner cavity of the pillar 1 by a steel wire rope clamp 6, and moves up and down in the inner cavity of the pillar along with the guide slider.

[0034] The guide slide block 2 is a block-shaped structure, and threaded holes are arranged on the four vertical surfaces thereof, so as to facilitate the installation of a dial indicator striker and a switch striker.

[0035] The dial indicator impact ruler 3 is a block-shaped structure, the upper part of which is a plane, and the lower part is provided with a mounting hole, and the dial indicator impact ruler can be assembled on the guide slide block through the mounting hole.

[0036] The switch striker is a long plate-like object, and an L-shaped plate is connected to its lower end. The contact end of the switch striker and the action switch roller 18 is a 45° upward folded structure, which plays a buffering role when the switch striker contacts the action switch roller.

[0037] The following steps are included when using the detection device for detection:

[0038] 1. First, electrically connect the action switch to the crane hoisting mechanism control unit and power it on;

[0039] 2. Manually raise the weight block so that the switch striker moves down with the guide slider and separates from the action switch roller;

[0040] 3. Manually lower the weight slowly to make the switch striker contact with the action switch roller and trigger the action switch. When you hear the "click" sound of the action switch disconnecting, record the percentage value a;

[0041] 4. According to the position of the weight at the test site, adjust the length of the wire rope at the end of the device weight block, so as to adjust the position of the weight block. Before the action switch is actuated, the device weight block is placed on the upper part of the weight, and the device guide slide (diameter indicator impact ruler) is located below the dial indicator measuring rod;

[0042] 5. Install the device correctly; lift the rated load weight of the test crane, lift it 200-300mm, and then slowly lower it. After the action switch is activated, the chain reaction of the test crane is triggered, and the weight stops descending. The inspector records the percentage indicator number b at this time; the crane lifting mechanism acts (rises). Repeat the above actions at least 3 times, and record the corresponding value of the dial indicator;

[0043] 6. Take the arithmetic mean of the measured data |ba| as the braking distance detection value of the test bridge crane hoisting mechanism.

[0044] In summary, the use of the dial indicator 3, the action switch 8, the dial indicator striker 3, the switch striker, the support 1, the wire rope 5, and the weight block 7 overcomes the problem that the prior art cannot meet the need for braking distance measurement.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, or it can be the internal communication of two components. For ordinary persons in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. Braking distance detection device for the hoisting mechanism on the crane, Features: The utility model comprises a pillar, and the bottom end of the pillar is connected to the front of the bottom plate through the base and bolts, the four corners of the back of the bottom plate are equipped with walking wheels, and the top of the pillar is connected with a lifting arm extending outward, and one end of the lower rope of the wire rope passes through the inner cavity of the pillar, and the rope comes out from the top of the pillar, passes around the pulley and hangs freely through the guide wheel, and the end of the wire rope is clamped with a heavy block by the wire rope clamp, and a dial indicator is embedded in one surface of the pillar, and the measuring rod on the dial indicator touches the dial indicator impact ruler, and the dial indicator impact ruler is fixed on the guide slider, the guide slider is assembled with the inner cavity of the pillar and can drive the dial indicator impact ruler to move up and down on the pillar, and the pillar is An action switch is fixed to the back of the sub-meter installation by bolts, one end of the roller on the action switch is in contact with the upper end of the switch impact ruler through a rotating shaft, and an L-shaped plate is installed at the lower end of the switch impact ruler to be assembled with a guide slider in the inner cavity of the pillar; the pillar is made of rectangular steel, and the four surfaces of the rectangular steel at the bottom end of the pillar are respectively welded to one end of the reinforcing rib plate, and the other end of the reinforcing rib plate is welded to the base to form a stable pillar frame; the lifting arm is connected to one end of the top of the pillar by welding, and a triangular plate is arranged at a 90° angle between the lifting arm and the end of the pillar, one end of the triangular plate is welded to the pillar, and the other end of the triangular plate is welded to the lifting arm.

2. The braking distance detection device for the hoisting mechanism on the crane according to claim 1, Features: The pulley is installed at the connection between the lifting arm and the top of the support. The center of the pulley passes through the shaft, and both ends of the shaft are fixed on the wheel frame and fixed to the lifting arm through fastening bolts.

3. The braking distance detection device for the hoisting mechanism on the crane according to claim 2, Features: The guide wheel is embedded in the extension end of the telescopic arm, the center of the guide wheel passes through the shaft, and both ends of the shaft are fixed on the wheel frame and fixed to the boom through fastening bolts.

4. The braking distance detection device for the hoisting mechanism on the crane according to claim 1, Features: The lower rope end of the steel wire rope is connected with the guide slider in the inner cavity of the pillar by a steel wire rope clamp, and moves up and down in the inner cavity of the pillar along with the guide slider.

5. The braking distance detection device for the hoisting mechanism on the crane according to claim 1, Features: The guide slider is a block-shaped structure, and threaded holes are arranged on the four vertical surfaces thereof for mounting the dial indicator and the impact ruler. Switch the ruler.

6. The braking distance detection device for the hoisting mechanism on the crane according to claim 1, Features: The dial indicator striker is a block-shaped structure, the upper part is a plane, and the lower part is provided with a mounting hole for assembling the dial indicator striker on the guide On the slider, the switch striker is a long plate-like object, the lower end of which is connected to an L-shaped plate, and the contact end of the switch striker and the action switch roller is folded upward at 45 degrees.

7. Method for detecting the braking distance of the hoisting mechanism on the crane. Features: The braking distance detection device for the hoisting mechanism on the crane according to claim 1 comprises the following steps during detection: ⑴. First, electrically connect the action switch to the crane hoisting mechanism control unit and power it on; ⑵. Manually raise the weight block so that the switch striker moves down with the guide slider and separates from the action switch roller; ⑶. Manually lower the weight slowly to make the switch striker contact with the action switch roller and trigger the action switch. When you hear the "click" sound of the action switch disconnecting, record the percentage value a; (4) According to the position of the weight at the test site, adjust the length of the wire rope at the end of the device weight block, thereby adjusting the position of the weight block, so that the device weight block is placed on the upper part of the weight before the action switch is actuated, and the device guide slide (diameter indicator impact ruler) is located below the dial indicator measuring rod; ⑸. Install the device correctly; lift the rated load weight of the test crane, lift it 200-300mm, and then slowly lower it; after the action switch is activated, the chain reaction of the test crane is triggered, and the weight stops descending. The tester records the percentage indicator number b at this time; the crane hoisting mechanism is activated (rising), and the above actions are repeated at least 3 times, and the corresponding value of the dial indicator is recorded; ⑹. Take the arithmetic mean of the measured data |ba| as the braking distance detection value of the test bridge crane hoisting mechanism.

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