Deflection detection device for main boom of crawler crane

Abstract

The invention discloses a deflection detection device for a main boom of a crawler crane. The deflection detection device is characterized in that a positioning disc is fixed on a crawler frame, a rotary table is perpendicular to the disc surface of the positioning disc relative to the rotating axis of the crawler frame, a receding hole is formed in the positioning disc, a slewing mechanism is located on the inner side of the receding hole, and the rotary table and the main boom are both located above the positioning disc; the detection device comprises a first connecting piece, a second connecting piece, a datum plate and a distance measuring sensor, the first connecting piece is fixed below the main arm frame, the second connecting piece and the first connecting piece are hinged and have a hinge axis, and the hinge axis is parallel to the hole center line of the second pin hole; the datum plate is fixed to the second connecting piece, and the length direction of the datum plate is parallel to the hinge axis. The two distance measuring sensors are both fixed to the datum plate, the detection directions of the two distance measuring sensors are parallel and are both perpendicular to the hinge axis, the two distance measuring sensors are arranged close to the two ends of the datum plate respectively, and the detection ends of the two distance measuring sensors are both aligned with the upper disc face of the positioning disc. The distance measuring sensor is connected with the main arm support through the connecting piece, the second connecting piece and the datum plate, and when the main arm support tilts, due to the gravity action of the first connecting piece, the second connecting piece, the datum plate and the distance measuring sensor, no matter how the main arm support moves relative to the positioning disc, the distance measuring sensor can accurately measure the distance. The detection end of the distance measuring sensor can be always aligned with the upper disc surface of the positioning disc, so that stable detection of deflection of the main boom is realized; the distance between the detection end of one distance measuring sensor and the upper disc surface of the positioning disc is A, and the distance between the detection end of the other distance measuring sensor and the upper disc surface of the positioning disc is B; the deflection degree of the main boom of the crawler crane can be judged according to the difference value of A and B; the detection mode and the detection principle are simple and effective, and the detection precision of the main boom is high.

Description

Technical Field

[0001] The present invention relates to the field of cranes, and more particularly to a yaw detection device for the main boom of a crawler crane. Background Art

[0002] Crawler cranes can perform operations such as lifting, transferring, and installing materials. Crawler cranes have the advantages of strong lifting capacity, small ground contact pressure, small turning radius, large climbing ability, no need for outriggers, load-carrying driving, good operation stability, and the ability to freely replace the combined height of the truss. They are widely used in construction industries such as electric power, municipal, bridge, petrochemical, and water conservancy and hydropower.

[0003] The turntable and the main boom of a crawler crane are generally connected by a pin shaft, that is, pin holes are respectively provided on the turntable and the main boom, and the pin shaft is simultaneously inserted into the above-mentioned pin holes. With the long-term use of the crawler crane or due to wear of the pin shaft or pin hole caused by other reasons, the gap between the pin shaft and the pin hole becomes larger or uneven. When the main boom of the crawler crane rotates with the turntable, along the rotation direction of the turntable, the main boom will swing significantly relative to the turntable. The existing yaw detection for the main boom has a complex structure and low detection accuracy.

[0004] Therefore, how to provide a yaw detection device for the main boom of a crawler crane to overcome the above problems is an urgent problem for those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a yaw detection device for the main boom of a crawler crane.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A yaw detection device for the main boom of a crawler crane, wherein pin holes one and two are respectively provided on the turntable and the main boom of the crawler crane, and the pin shaft is simultaneously inserted into pin hole one and pin hole two. The device includes:

[0008] A positioning disk, which is fixed on the crawler frame of the crawler crane. The rotation axis line of the turntable of the crawler crane relative to the crawler frame is perpendicular to the disk surface of the positioning disk. A relief hole is provided on the positioning disk, and the slewing mechanism of the crawler crane is located inside the relief hole. The turntable and the main boom of the crawler crane are both located above the positioning disk;

[0009] Detection device, the detection device includes a first connecting piece, a second connecting piece, a reference plate and a ranging sensor. The first connecting piece is fixed under the main boom of the crawler crane; the second connecting piece is hinged to the first connecting piece and the two have a hinge axis line, and the hinge axis line is parallel to the hole center line of the second pin hole; the reference plate is fixed to the second connecting piece, and the length direction of the reference plate is parallel to the hinge axis line; there are two ranging sensors and both are fixed on the reference plate. The detection directions of the two ranging sensors are parallel and both are perpendicular to the hinge axis line. The two ranging sensors are arranged near the two ends of the reference plate respectively, and the detection ends of the two ranging sensors are both aligned with the upper disk surface of the positioning disk.

[0010] It can be seen from the above technical solutions that compared with the prior art, the present invention discloses a main boom yaw detection device for a crawler crane. In this application, the ranging sensor is connected to the main boom through the first connecting piece, the second connecting piece and the reference plate. When the main boom is pitching, due to the gravity of the first connecting piece, the second connecting piece, the reference plate and the ranging sensor, no matter how the main boom moves relative to the positioning disk, the detection end of the ranging sensor can always be aligned with the upper disk surface of the positioning disk, so as to realize the stable detection of the main boom yaw; the distance between the detection end of one ranging sensor and the upper disk surface of the positioning disk is A, and the distance between the detection end of the other ranging sensor and the upper disk surface of the positioning disk is B; the yaw degree of the main boom of the crawler crane can be judged by the difference between A and B; this detection method and detection principle are simple and effective, and the detection accuracy of the main boom is high.

[0011] Preferably, the positioning disk is a disc, a relief hole is centrally opened on the positioning disk, and a limiting ring is integrally formed coaxially on the upper disk surface of the positioning disk. The detection end of the ranging sensor is located in the area jointly defined by the outer side edge of the positioning disk and the limiting ring. The detection end of the ranging sensor can be arranged in the above area.

[0012] Preferably, the detection device further includes a hinge shaft and a bearing. Both ends of the hinge shaft are fixed to the first connecting piece. An installation sleeve is integrally formed on the second connecting piece, and a bearing is coaxially embedded inside the installation sleeve, and the inner ring of the bearing is sleeved on the hinge shaft. The first connecting piece and the second connecting piece can be reliably hinged.

[0013] Preferably, the plate surface of the reference plate is parallel to the pipe center line of the installation sleeve, and the center line in the plate length direction of the reference plate, the pipe center line of the installation sleeve and the center line in the detection direction of the two ranging sensors are coplanar. When the main boom is changing amplitude, the reference plate can also be stably arranged.

[0014] Preferably, it further includes an electromagnet, the electromagnet is fixed on the lower plate surface of the reference plate, and the magnetic attracting end of the electromagnet can be aligned with the upper disk surface of the iron positioning disk. After the electromagnet is energized, it can attract the positioning disk, thereby accelerating or facilitating the stability of the ranging sensor.

[0015] Preferably, the electromagnet is located between the two ranging sensors.

[0016] Preferably, it further includes a cleaning brush. The cleaning brush is fixed on the turntable of the crawler crane. The bristles of the cleaning brush are in contact with the upper surface of the positioning disk. The cleaning brush and the reference plate are arranged in sequence along the circumferential direction of the positioning disk. The upper surface of the positioning disk can be cleaned in real time.

[0017] Preferably, it further includes a controller. The controller is installed on the turntable of the crawler crane. The electromagnet and the two distance measuring sensors are both electrically connected to the controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0019] Figure 1 is an installation schematic diagram of a main boom yaw detection device for a crawler crane;

[0020] Figure 2 is an axonometric schematic diagram of a main boom yaw detection device for a crawler crane Figure 1 ;

[0021] Figure 3 is an axonometric schematic diagram of a main boom yaw detection device for a crawler crane Figure 2 ;

[0022] Figure 4 is a partial exploded bearing schematic diagram of a main boom yaw detection device for a crawler crane.

[0023] In the figure:

[0024] 01 is the positioning disk, 010 is the relief hole, 011 is the limit ring, 02 is the first connecting piece, 03 is the second connecting piece, 030 is the installation sleeve, 04 is the reference plate, 05 is the distance measuring sensor, 06 is the hinge shaft, 07 is the bearing, 08 is the electromagnet, 09 is the cleaning brush, and 10 is the main boom. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] The present invention discloses a yaw detection device for the main boom 10 of a crawler crane. In this application, a positioning disk 01 is designed and fixed to the crawler frame. Therefore, the positioning disk 01 can be used as a detection reference for determining whether the main boom 10 yaws relative to the crawler frame.

[0027] The distance measuring sensor 05 is connected to the main boom 10 through a connecting member, a second connecting member 03, and a reference plate 04. When the main boom 10 pitches, due to the gravitational action of the first connecting member 02, the second connecting member 03, the reference plate 04, and the distance measuring sensor 05, no matter how the main boom 10 moves relative to the positioning disk 01, the detection end of the distance measuring sensor 05 can always be aligned with the upper disk surface of the positioning disk 01, thereby realizing stable detection of the yaw of the main boom 10.

[0028] The distance between the detection end of one distance measuring sensor 05 and the upper disk surface of the positioning disk 01 is A, and the distance between the detection end of the other distance measuring sensor 05 and the upper disk surface of the positioning disk 01 is B. Under normal circumstances, when the main boom 10 of the crawler crane rotates with the slewing platform, A is the same as B; conversely, when the assembly gap between the pin shaft and the first pin hole and the second pin hole becomes larger, the main boom 10 will yaw, and A is different from B. The degree of yaw of the main boom 10 of the crawler crane can be judged by the difference between A and B; this detection method and detection principle are simple and effective, and the detection accuracy of the main boom 10 is high.

[0029] By designing an electromagnet 08, when the main boom 10 is undergoing amplitude variation, the distance measuring sensor 05 may shake. After the electromagnet 08 is powered on, it can be magnetically attracted to the positioning disk 01. The distance measuring sensor 05 can be quickly restored to a stable arrangement through the electromagnet 08, thereby improving the detection effect.

[0030] At the same time, when the main boom 10 pitches, the distance measuring sensor 05 detects that the distance between it and the positioning disk 01 increases. At this time, the controller can control the magnetic force of the electromagnet 08 to become stronger, ensuring that the detection end of the distance measuring sensor 05 is stably arranged downward.

[0031] By designing a cleaning brush 09, no impurities will accumulate on the upper disk surface of the positioning disk 01, thereby ensuring the detection accuracy.

[0032] Embodiment

[0033] See Appendix Figures 1-4The figure is a schematic diagram of the overall and partial structures of an embodiment of the present invention. The present invention specifically discloses a yaw detection device for the main boom 10 of a crawler crane. A first pin hole and a second pin hole are respectively provided on the turntable and the main boom 10 of the crawler crane, and a pin shaft is simultaneously inserted into the first pin hole and the second pin hole. Under normal circumstances, the assembly clearances between the pin shaft and the first pin hole and the second pin hole meet the set requirements. When the main boom 10 of the crawler crane rotates with the turntable, the pin shaft will not undergo non-axial movement in the first pin hole and the second pin hole, that is, along the rotation direction of the turntable, the main boom 10 will not undergo large yaw relative to the turntable. However, with the long-term use of the crawler crane or due to other reasons, the clearances between the pin shaft and the first pin hole and the second pin hole become larger or uneven. When the main boom 10 of the crawler crane rotates with the turntable, along the rotation direction of the turntable, the main boom 10 will undergo large yaw relative to the turntable.

[0034] The detection device involved in the present application can detect the yaw degree of the main boom 10 of the crawler crane. The device includes:

[0035] A positioning disk 01. The iron positioning disk 01 is fixed on the crawler frame of the crawler crane. The rotation axis line of the turntable of the crawler crane relative to the crawler frame is perpendicular to the disk surface of the positioning disk 01. A relief hole 010 is provided on the positioning disk 01. The slewing mechanism of the crawler crane is located inside the relief hole 010. The turntable and the main boom 10 of the crawler crane are both located above the positioning disk 01.

[0036] A detection device. The detection device includes a first connecting piece 02, a second connecting piece 03, a reference plate 04, and a distance measuring sensor 05. The first connecting piece 02 is fixed below the main boom 10 of the crawler crane by welding or bolt connection. In the present application, the first connecting piece 02 is fixed to the main boom 10 of the crawler crane by welding. The second connecting piece 03 is hinged to the first connecting piece 02 and the two have a hinge axis line, and the hinge axis line is parallel to the hole center line of the second pin hole. The reference plate 04 is fixed to the second connecting piece 03, and the length direction of the reference plate 04 is parallel to the hinge axis line. Two distance measuring sensors 05 are provided and both are fixed on the reference plate 04. The detection directions of the two distance measuring sensors 05 are parallel and both are perpendicular to the hinge axis line. The two distance measuring sensors 05 are respectively arranged near both ends of the reference plate 04, and the detection ends of the two distance measuring sensors 05 are both aligned with the upper disk surface of the positioning disk 01.

[0037] Due to the action of gravity, the detection end of the distance measuring sensor 05 can always be aligned with the upper disk surface of the positioning disk 01. The distance between the detection end of one distance measuring sensor 05 and the upper disk surface of the positioning disk 01 is A, and the distance between the detection end of the other distance measuring sensor 05 and the upper disk surface of the positioning disk 01 is B. When the main boom 10 of the crawler crane rotates with the turntable, the yaw degree of the main boom 10 of the crawler crane can be judged by the difference between A and B.

[0038] In this application, the positioning disc 01 is a disc. A relief hole 010 is centrally formed on the positioning disc 01. A limiting ring 011 is integrally formed coaxially on the upper disc surface of the positioning disc 01. The detection end of the distance measuring sensor 05 is located within the region jointly defined by the outer side edge of the positioning disc 01 and the limiting ring 011. No matter how the main boom 10 of the crawler crane pitches and amplitude changes, the detection end of the distance measuring sensor 05 is always located within the region jointly defined by the outer side edge of the positioning disc 01 and the limiting ring 011. The distance measuring sensor 05 in this application is a laser distance measuring sensor.

[0039] More specifically, the detection device further includes a hinge shaft 06 and bearings 07. Both ends of the hinge shaft 06 are fixed to the connecting member one 02. An installation sleeve 030 is integrally formed on the connecting member two 03. Two bearings 07 are coaxially embedded inside the installation sleeve 030. The two bearings 07 are respectively arranged near both ends of the installation sleeve 030. The inner ring of the bearing 07 is sleeved on the hinge shaft 06.

[0040] The plate surface of the reference plate 04 is parallel to the pipe center line of the installation sleeve 030. The center line in the plate length direction of the reference plate 04, the pipe center line of the installation sleeve 030, and the center line in the detection direction of the two distance measuring sensors 05 are coplanar. The reference plate 04 can be stably arranged, and the distance measuring sensor 05 can always be aligned with the upper disc surface of the positioning disc 01.

[0041] More specifically, it further includes an electromagnet 08. The electromagnet 08 is fixed on the lower plate surface of the reference plate 04. The magnetic attracting end of the electromagnet 08 can be aligned with the upper disc surface of the steel positioning disc 01. The magnetic attraction of the electromagnet 08 is sufficient to ensure that when the main boom 10 of the crawler crane pitches or slews, the detection end of the distance measuring sensor 05 can be stably arranged downward, and the swaying distance measuring sensor 05 can quickly and stably be aligned with the positioning disc 01.

[0042] The electromagnet 08 is located between the two distance measuring sensors 05, and the electromagnet 08 can be reliably arranged.

[0043] More specifically, it further includes a cleaning brush 09. The cleaning brush 09 is fixed on the turntable of the crawler crane

[0044] The elastic bristles of the cleaning brush 09 are in contact with the upper disc surface of the positioning disc 01. The cleaning brush 09 and the reference plate 04 are arranged in sequence along the circumferential direction of the positioning disc 01. When the turntable rotates relative to the crawler frame, the cleaning brush 09 on the turntable can clean the upper disc surface of the positioning disc 01, avoiding the accumulation of impurities on the upper disc surface of the positioning disc 01, and thus avoiding the influence of impurities on the positioning disc 01 on the yaw detection of the main boom 10.

[0045] More specifically, it further includes a controller (not shown in the figure). The controller is installed on the turntable of the crawler crane. The electromagnet 08 and the two distance measuring sensors 05 are both electrically connected to the controller.

[0046] When the detection device is applied: No matter how the main boom 10 moves relative to the positioning disk 01, the detection end of the distance measuring sensor 05 can always be aligned with the upper disk surface of the positioning disk 01; the distance between the detection end of one distance measuring sensor 05 and the upper disk surface of the positioning disk 01 is A, and the distance between the detection end of the other distance measuring sensor 05 and the upper disk surface of the positioning disk 01 is B;

[0047] Under normal circumstances, when the main boom 10 of the crawler crane rotates with the slewing platform, A is the same as B;

[0048] On the contrary, when the assembly clearance between the pin shaft and the first pin hole and the second pin hole becomes larger, A is different from B, and the deviation degree of the main boom 10 of the crawler crane can be judged by the difference between A and B.

[0049] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0050] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A yaw detection device for the main boom of a crawler crane. A first pin hole and a second pin hole are respectively provided on the slewing platform and the main boom of the crawler crane, and a pin shaft is simultaneously inserted into the first pin hole and the second pin hole. It is characterized in that Comprising: A positioning disk, which is fixed on the crawler frame of the crawler crane. The rotation axis line of the slewing platform of the crawler crane relative to the crawler frame is perpendicular to the disk surface of the positioning disk. A relief hole is provided on the positioning disk. The slewing mechanism of the crawler crane is located inside the relief hole. The slewing platform and the main boom of the crawler crane are both located above the positioning disk; A detection device, which includes a first connecting piece, a second connecting piece, a reference plate and a distance measuring sensor. The first connecting piece is fixed under the main boom of the crawler crane; the second connecting piece is hinged to the first connecting piece and the two have a hinge axis line, and the hinge axis line is parallel to the hole center line of the second pin hole; the reference plate is fixed to the second connecting piece, and the length direction of the reference plate is parallel to the hinge axis line; there are two distance measuring sensors, both of which are fixed on the reference plate. The detection directions of the two distance measuring sensors are parallel and both perpendicular to the hinge axis line. The two distance measuring sensors are arranged near the two ends of the reference plate respectively, and the detection ends of the two distance measuring sensors are both aligned with the upper disk surface of the positioning disk.

2. The yaw detection device for the main boom of a crawler crane according to claim 1, characterized in that, The positioning disk is a disk, and a relief hole is centrally provided on the positioning disk. A limiting ring is integrally formed coaxially on the upper disk surface of the positioning disk. The detection end of the distance measuring sensor is located in the area defined by the outer side edge of the positioning disk and the limiting ring.

3. The yaw detection device for the main boom of a crawler crane according to claim 1, characterized in that, The detection device further includes a hinge shaft and a bearing. Both ends of the hinge shaft are fixed to the first connecting piece. An installation sleeve is integrally formed on the second connecting piece, and a bearing is coaxially embedded inside the installation sleeve. The inner ring of the bearing is sleeved on the hinge shaft.

4. A yaw detection device for the main boom of a crawler crane according to claim 3, characterized in that, The plate surface of the reference plate is parallel to the tube center line of the installation sleeve. The center line in the plate length direction of the reference plate, the tube center line of the installation sleeve and the center line in the detection direction of the two distance measuring sensors are coplanar.

5. The yaw detection device for the main boom of a crawler crane according to claim 1, characterized in that, It further includes an electromagnet, which is fixed on the lower plate surface of the reference plate, and the magnetic attracting end of the electromagnet can be aligned with the upper disk surface of the iron positioning disk.

6. The yaw detection device for the main boom of a crawler crane according to claim 5, characterized in that, The electromagnet is located between the two distance measuring sensors.

7. A yaw detection device for the main boom of a crawler crane according to claim 2, characterized in that It further includes a cleaning brush, which is fixed on the slewing platform of the crawler crane. The bristles of the cleaning brush are in contact with the upper disk surface of the positioning disk. The cleaning brush and the reference plate are arranged in sequence along the circumferential direction of the positioning disk.

8. The swing detection device for the main boom of a crawler crane according to claim 5, characterized in that It further includes a controller, which is installed on the slewing platform of the crawler crane. The electromagnet and the two distance measuring sensors are both electrically connected to the controller.

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