A crane telescopic cylinder measuring device and its application

Abstract

The present application relates to a kind of crane telescopic cylinder measuring device and its application, device includes cylinder climber, range board, reset spring, support, pin shaft, limit block, laser ranging sensor. Among them, cylinder climber is fixed in the tail of inner section arm of crane boom, support is fixed on the outer section arm of crane boom, range board is hinged with support by pin shaft;Range board can be lifted around pin shaft, range board is connected with the outer section arm of crane boom by reset spring;Limit block is fixed on support, limit the rotation angle of range board around pin shaft;Laser ranging sensor is installed below the tail of basic arm of crane boom.The crane telescopic cylinder measuring device of the present application is applied to crane single cylinder bolt telescopic system arm pin fixed point release technology, by determining the position of lower section arm, the inaccuracy of arm pin release position caused by boom hunting can be effectively avoided.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery technology, and specifically relates to a measuring device for a crane telescopic cylinder and its application. Background Technology

[0002] Wheeled crane telescopic mechanisms can be mainly divided into rope-type and single-cylinder pin-type. The single-cylinder pin-type telescopic system has the advantages of simple structure and adaptability to multi-section boom cranes, and is widely used in medium and large tonnage cranes with five or more boom sections. The single-cylinder pin-type telescopic mechanism mainly consists of a telescopic cylinder, a cylinder head, and a length measuring sensor. The cylinder head is equipped with a mechanism to drive the cylinder pin and boom pin, which can achieve locking between boom sections and between the cylinder head and boom sections respectively through the boom pin and cylinder pin. The length measuring sensor is installed at the tail of the basic boom to measure the displacement of the cylinder head and determine the boom pin release position. The telescopic cylinder drives the boom sections locked by the cylinder pins to extend and retract sequentially from the inside out. During the operation of the single-cylinder pin-type telescopic system, the key is whether the cylinder head can successfully find the position of the boom pin hole on the outer boom section, drive the boom pin mechanism to complete the boom pin release, and achieve locking between the two boom sections. The existing boom pin release scheme for single-cylinder pin-operated crane telescopic systems involves a telescopic cylinder driving the boom pin, with a length-measuring sensor providing real-time feedback on the distance between the boom pin and the tail of the basic boom. When this distance equals the distance between the target boom pin hole and the tail of the basic boom, the cylinder head release mechanism releases the boom pin, allowing it to insert into the target boom pin hole. Currently, to ensure successful boom pin insertion during boom extension, a pre-release scheme is often used. That is, when the telescopic cylinder drives the inner boom section to extend, the inner boom pin is released before reaching the target boom pin hole of the outer boom section. The telescopic cylinder then drives the boom pin to continue moving forward until it aligns with the boom pin hole. Under spring force, the boom pin inserts into the boom pin hole, locking both boom sections. However, this technology has the following drawbacks: When the inner boom section of the crane extends, due to friction between boom sections and gaps between the boom pin and its hole, and between the cylinder pin and its hole, the inner boom section may cause other boom sections to move axially outward. Therefore, the determination of the boom pin release position based on the length measuring sensor will have errors, leading to pin release failure. Using a pre-release boom pin scheme results in the boom pin impacting the outer boom cylinder, generating impact noise; moreover, pre-release requires the telescopic cylinder to decelerate a certain distance in advance, resulting in low telescopic efficiency. Therefore, the problem of boom pin release failure due to inaccurate telescopic cylinder positioning during boom extension and retraction in single-cylinder pin-type cranes is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0003] Purpose of the invention: In view of the shortcomings of the prior art, the purpose of this invention is to provide a crane telescopic cylinder measuring device and its application, so as to solve the problem of failure of the telescopic cylinder to release the boom pin at the fixed point during the boom extension and retraction of a single-cylinder pin-type crane.

[0004] Technical Solution: The crane telescopic cylinder measuring device of the present invention comprises a cylinder climber, a distance measuring plate, a return spring, a support, a pin, a limit block, and a laser distance measuring sensor. The cylinder climber is fixed to the tail of the inner boom section, the support is fixed to the outer boom section, and the distance measuring plate is hinged to the support via the pin. The distance measuring plate can be raised and lowered around the pin, and is connected to the outer boom section via the return spring. The limit block is fixed to the support, limiting the rotation angle of the distance measuring plate around the pin. The laser distance measuring sensor is installed below the tail of the main boom section to measure the displacement change of the distance measuring plate.

[0005] Furthermore, the rotation angle of the ranging plate is 20-90°.

[0006] Furthermore, the reset spring can be a compression spring or a torsion spring.

[0007] Furthermore, the limiting block is welded and fixed to the support.

[0008] Furthermore, the laser rangefinder can be a single sensor to measure the position of the rangefinder plate, or multiple sensors can be installed at the tail of the basic arm to detect the distance between each arm segment and the tail, thereby calculating the release position of the arm pin.

[0009] This invention also provides an application of a crane telescopic cylinder measuring device. This device works in conjunction with a length-measuring sensor integrated into the crane telescopic system to calculate the positional relationship between the boom pin and the outer boom section, and determines the timing for releasing the boom pin based on this relationship. The crane telescopic system includes a cylinder head body, which has a rectangular groove allowing a distance measuring plate to pass freely.

[0010] The working principle of the telescopic cylinder measuring device is explained using the extension process of the three-section boom. When the cylinder pin of the telescopic cylinder inserts into the cylinder pin hole at the tail of the three-section boom, causing the three-section boom to begin extending, the cylinder climber of the three-section boom gradually disengages from the distance measuring plate installed at the tail of the two-section boom. Under the action of the return spring, the distance measuring plate rotates counterclockwise around the pin shaft until it reaches the position of the limit block. At this time, the measured plane of the distance measuring plate is perpendicular to the axis of the laser rangefinder, and the laser rangefinder sensor measures the displacement of the distance measuring plate of the two-section boom. As the telescopic cylinder continues to extend the three-section boom, the length measuring sensor connected to the cylinder head of the telescopic cylinder provides real-time feedback on the displacement of the telescopic cylinder, i.e., the displacement of the boom pin relative to the tail of the basic boom; the laser rangefinder sensor installed at the tail of the basic boom measures the displacement of the distance measuring plate at the tail of the five-section boom in real time. The difference between the feedback distance of the length measuring sensor and the feedback distance of the laser rangefinder sensor is the displacement of the boom pin relative to the tail of the two-section boom. When the boom pin's displacement relative to the tail of the second boom section reaches the distance between the target boom pin hole on the second boom section and the tail of the second boom section, the boom pin cylinder actuates, and the third boom pin inserts into the second boom pin hole, completing the pin release of the second and third boom sections. The working principle of pin release during the extension of the second, fourth, fifth, and sixth boom sections is the same as the principle of extending the third boom section.

[0011] Beneficial Effects: Compared with existing technologies, this invention has the following advantages: The crane telescopic cylinder measuring device of this invention, applied to the boom pin positioning release technology of a crane single-cylinder pin telescopic system, can accurately measure the displacement of the outer boom section, avoiding changes in the outer boom displacement caused by the movement of the inner boom section, which in turn prevents the telescopic cylinder head from accurately locating the boom, ultimately leading to the failure of the boom pin positioning release. This invention effectively avoids inaccurate boom pin release positions caused by boom movement by determining the position of the lower boom section. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the crane telescopic cylinder measuring device provided by the present invention;

[0013] Figure 2 This is a schematic diagram of a boom telescopic system;

[0014] Figure 3 This is a schematic diagram of the rangefinder device for the inner extension arm, in which... Figure 3 (a) is a schematic diagram of the inner arm retraction. Figure 3 (b) is a schematic diagram of the inner arm extension start. Figure 3 (c) is a schematic diagram of the inner arm extending;

[0015] Figure 4 This is a schematic diagram of the cylinder head structure of a telescopic hydraulic cylinder. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1As shown, the present invention provides a measuring device mainly composed of an inner boom section 1, a cylinder climber 2, a distance measuring plate 3, a return spring 4, an outer boom section 5, a support 6, a pin 7, a limiting block 8, and a laser distance measuring sensor 9. The distance measuring plate 3 is hinged to the support 6 via the pin 7; the distance measuring plate 3 is connected to the outer boom section 5 via the return spring; the limiting block 8 is welded to the support 6, limiting the rotation angle of the distance measuring plate 3 around the pin 7; the laser distance measuring sensor 9 is installed below the tail of the main boom section 11 to measure the displacement change of the distance measuring plate 3.

[0018] Taking a six-section boom single-cylinder pin telescopic system as an example, distance measuring plates 3 are installed at the tail of the second, third, fourth, and fifth boom sections, and a laser distance measuring sensor 9 is installed below the tail of the main boom 11. When each boom section is in the fully retracted state, the cylinder climber 2 welded to the tail of each boom section pushes the distance measuring plate 3 to rotate clockwise around the pin 7, overcoming the force of the return spring 4. The distance measuring plates 3 of the second to fifth boom sections are hidden below the upper plane of the cylinder climber 2, and the laser distance measuring sensor 9 outputs an invalid measurement distance.

[0019] like Figures 2-3 As shown, the working process of the telescopic cylinder measuring device is illustrated using the extension of the three-section boom: When the telescopic cylinder pin 113 is inserted into the tail pin hole of the three-section boom 110, causing the three-section boom 110 to begin extending, the cylinder climber 2 of the three-section boom 110 gradually disengages from the measuring plate 3 installed at the tail of the two-section boom 15. Under the action of the return spring 4, the measuring plate 3 rotates counterclockwise around the pin 7 until it reaches the position of the limit block 8. At this time, the measured plane of the measuring plate 3 is perpendicular to the axis of the laser rangefinder 9, and the laser rangefinder 9 measures the displacement of the measuring plate 3 on the two-section boom 15. The state changes of the measuring device are as follows: Figure 3 As shown, during the extension of the three-section boom driven by the telescopic cylinder 111, the length measuring sensor 12 connected to the cylinder head 13 of the telescopic cylinder provides real-time feedback on the displacement of the telescopic cylinder 111, i.e., the displacement of the arm pin 14 relative to the tail of the basic arm 11; the laser rangefinder 9 installed at the tail of the basic arm measures the displacement of the five-section arm tail measuring plate 9 in real time. The difference between the distance fed back by the length measuring sensor 12 and the distance fed back by the laser rangefinder 9 is the displacement of the arm pin 14 relative to the tail of the second-section arm 15. When the displacement of the arm pin 14 relative to the tail of the second-section arm reaches the distance between the target arm pin hole 112 on the second arm and the tail of the second-section arm, the arm pin cylinder actuates, and the third-section arm pin inserts into the arm pin hole 112 of the second-section arm, completing the fixed-point release of the arm pin 14 of the second and third sections.

[0020] The working principle of the fixed-point release of the boom pin during the extension of the second, fourth, fifth, and sixth sections of the crane boom is the same as that of the third section boom extension.

[0021] When the telescopic cylinder 111 retracts with its arm, the cylinder climber 2 pushes the measuring plate 3 of the lower arm to overcome the force of the return spring 4 and rotate clockwise around the pin 7. The measuring plate 3 sinks below the upper plane of the cylinder climber 2, without affecting the telescopic movement of the telescopic cylinder 111. Considering that when the telescopic cylinder 111 is extended without a cylinder, the lower slider 10 of the cylinder head body will interfere with the movement of the measuring plate 3, the cylinder head body 13 of the telescopic cylinder is machined into a rectangular groove that allows the measuring plate 3 to pass freely, such as... Figure 4 As shown.

[0022] The technical solution of this invention, applied to the technique of fixed-point release of the boom pin in a single-cylinder telescopic boom, transforms the criterion for releasing the boom pin from the displacement of the boom pin relative to the tail of the basic boom to the distance of the boom pin relative to the tail of the next extended boom section. This conversion of the boom pin position reference point eliminates the influence of other boom section movement on the boom pin hole positioning, accurately measures the position of the telescopic cylinder head relative to the boom pin hole, and ensures accurate fixed-point release and insertion of the boom pin into the boom pin hole. This effectively avoids the problem of failed fixed-point release of the boom pin due to inaccurate telescopic cylinder positioning during boom extension and retraction.

Claims

1. A crane telescopic cylinder measuring device, characterized in that, The device comprises a cylinder climbing device (2), a distance measuring plate (3), a reset spring (4), a support (6), a pin shaft (7), a limiting block (8), and a laser distance measuring sensor (9); wherein the cylinder climbing device (2) is fixed to the tail of the inner section arm (1) of the boom, the support (6) is fixed to the outer section arm (5) of the boom, and the distance measuring plate (3) is hinged to the support (6) through the pin shaft (7); the distance measuring plate (3) can be lifted and lowered around the pin shaft (7), the distance measuring plate (3) is connected to the outer section arm (5) of the boom through the reset spring (4); the limiting block (8) is fixed to the support (6) to limit the rotation angle of the distance measuring plate (3) around the pin shaft (7); and the laser distance measuring sensor (9) is installed below the tail of the basic arm (11) of the boom. The rotation angle of the distance measuring plate (3) is 20-90°.

2. Crane telescopic cylinder measuring device according to claim 1, characterized in that, The reset spring (4) is a torsion spring.

3. Crane telescopic cylinder measuring device according to claim 1, characterized in that, The reset spring (4) is a compression spring.

4. Crane telescopic cylinder measuring device according to claim 1, characterized in that, The limiting block (8) is welded and fixed to the support (6).

5. Crane telescopic cylinder measuring device according to claim 1, characterized in that, The laser distance measuring sensor (9) is installed with one or more.

6. Use of a crane telescopic cylinder measuring device according to any one of claims 1 to 5, characterized in that, The crane telescopic cylinder measuring device is used in cooperation with the length measuring sensor (12) of the crane telescopic system to calculate the positional relationship of the arm pin (14) relative to the outer section arm (5) and determine the release time of the arm pin (14) according to the positional relationship.

7. Use of a crane telescopic cylinder measuring device according to claim 6, characterized in that, The crane telescopic system comprises a cylinder head body (13) provided with a rectangular slot for the free passing of the distance measuring plate (3).

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