Limiting device for extension of suspension arm of automobile crane

Abstract

The utility model relates to the field of automobile cranes, in particular to an automobile crane suspension arm extension limiting device which is installed on an automobile crane, the automobile crane comprises a plurality of suspension arms which are sleeved end to end, every two adjacent suspension arms are called a first arm and a second arm, the first arm is slidably arranged on the second arm in a sleeving mode, and the second arm is slidably arranged on the first arm in a sleeving mode. Comprising a first detection piece installed on the first arm and a second detection piece installed on the second arm, and the truck crane is configured to stop when the second detection piece abuts against the first detection piece. The device has the effects that the extension length of the suspension arm can be controlled, the working efficiency is guaranteed, and the risk caused by overlong extension of the suspension arm is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of truck cranes, in particular to a truck crane boom length limiting device. BACKGROUND

[0002] At present, in the truck crane industry, with the development of mechanical equipment towards large-scale and multi-functional, higher requirements are put forward for the operation accuracy and safety of the boom. Especially in the working environment that needs to accurately control the extension length of the boom, such as the application of construction sites, port loading and unloading, equipment installation and other occasions. These occasions have very high requirements for the telescopic accuracy of the boom, to ensure that the boom can be telescoped to the same position for operation each time. The traditional truck crane relies on the experience of the operator to judge the extension and recovery length of the boom, when the boom extension has deviation from the set position, the operator will need to repeatedly adjust the extension length of the boom, the operation efficiency is low, and when the extension length of the boom is too large, it is easy to appear overload or overstretching risk. CONTENT OF THE INVENTION

[0003] In order to realize the control of the extension length of the boom, protect the operation efficiency, and reduce the risk of overlong extension of the boom, the present application provides a truck crane boom length limiting device.

[0004] The truck crane boom length limiting device provided by the present application adopts the following technical scheme:

[0005] A truck crane boom length limiting device is installed on a truck crane, the truck crane includes a plurality of booms which are telescopically arranged in series, wherein two adjacent booms are referred to as a first boom and a second boom, the first boom is telescopically arranged on the second boom, characterized in that: it comprises a first detection member installed on the first boom and a second detection member installed on the second boom, and the truck crane is configured to stop when the second detection member and the first detection member abut.

[0006] By adopting the above technical scheme, the truck crane boom length limiting device can immediately stop the further extension of the boom when the second detection member and the first detection member abut during the extension of the boom, thereby effectively avoiding the overload or overstretching risk caused by the overlong extension of the boom. At the same time, this limiting method can ensure that the boom is extended to the preset position each time, improve the operation accuracy and efficiency, and reduce the repeated adjustment problem caused by insufficient experience of the operator.

[0007] Optionally, the first detection member is a travel switch, and the second detection member is a first contact block fixed to the second boom.

[0008] By adopting the above technical scheme, when the second arm slides relative to the first arm to the preset position, the first contact block will trigger the travel switch, thereby immediately stopping the further elongation action of the jib, effectively avoiding the safety hazard caused by the over-elongation of the jib. At the same time, the design makes the operation more accurate, reduces the misoperation caused by human factors, and improves the work efficiency.

[0009] Optionally, the first detection member is a proximity switch, and the second detection member is a second contact block fixed to the second arm.

[0010] By adopting the above technical scheme, when the first arm slides relative to the second arm, the proximity switch installed on the first arm will detect the second contact block installed on the second arm. Once the two are close to a certain distance, the proximity switch will trigger a signal to stop the truck crane from further elongating the jib.

[0011] Optionally, the first detection member is a signal receiver, and the second detection member is a signal transmitter fixed to the second arm for emitting a signal. The signal receiver can receive the signal emitted by the signal transmitter.

[0012] By adopting the above technical scheme, when the second detection member slides relative to the first detection member, the signal receiver can receive the signal emitted by the signal transmitter. When the signal receiver receives the signal emitted by the signal transmitter, the truck crane will be controlled to stop further elongating the jib, thereby effectively preventing the safety hazard caused by the over-elongation of the jib. At the same time, this design scheme does not require physical contact, avoiding the wear and tear problem that may exist in traditional mechanical contacts, and improving the reliability and service life of the system.

[0013] Optionally, the first detection member is in sliding connection with the first arm, and an adjusting assembly for driving the first detection member to slide relative to the first arm is arranged outside the first arm.

[0014] By adopting the above technical scheme, flexible adjustment of the position of the first detection member is realized, so that the relative position between the first detection member and the second detection member can be adjusted according to actual needs, improving the applicability and precision of the jib elongation limiting device. Specifically, the design of the adjusting assembly allows the operator to quickly and accurately adjust the position of the first detection member according to different working environments and the requirements of the jib elongation length, thereby ensuring that the jib stops in time when reaching the preset position, avoiding repeated adjustments due to position deviation, and improving the work efficiency and safety.

[0015] Optionally, one end of the first detection member is fixedly connected with a mounting plate, and a sliding groove is formed in the inner wall of the first arm for embedding and sliding the mounting plate.

[0016] By adopting the technical scheme, the first detection piece can slide in the sliding groove inside the first arm, the position adjustability of the first detection piece is effectively improved, the position of the first detection piece is adjusted according to the actual working condition, and the accuracy and reliability of the boom length limiting device are ensured.

[0017] Optionally, the adjusting assembly comprises a pulling spring fixed between one end of the sliding groove and the mounting plate, a pull rope fixed at an end of the mounting plate away from the pulling spring, and a fixing member arranged on the outer wall of the first arm and used for fixing the position of the end of the pull rope away from the mounting plate, and the end of the pull rope away from the mounting plate is exposed to the outside from one end of the first arm.

[0018] By adopting the technical scheme, the pulling spring can automatically reset when the first detection piece is subjected to external force, so that the first detection piece is always in the preset position; the design of the pull rope enables the operator to manually adjust the position of the first detection piece externally, so that the limiting point is flexibly adjusted, and the accuracy and reliability of the boom extension and retraction are improved. The fixing member ensures that the fixed position of the pull rope is stable, avoids the change of the position of the first detection piece caused by loosening, and further improves the stability and safety of the system.

[0019] Optionally, the fixing member comprises a guide rail fixed on the outer wall of the first arm, a mounting block slidingly connected in the guide rail, and a clamping bolt threadedly connected to the mounting block, a sliding groove for sliding of the clamping bolt is formed in the guide rail, and the end of the pull rope away from the mounting plate is fixed to the mounting block.

[0020] By adopting the technical scheme, the mounting block can drive the first detection piece to slide in the sliding groove through the pull rope by sliding the mounting block in the guide rail, so that the position of the first detection piece is adjusted. After adjustment, the position of the mounting block in the guide rail can be fixed by the clamping bolt, and the adjustment is more convenient and smooth.

[0021] Optionally, one end of the first arm is rotationally connected with a reversing wheel used for reversing the pull rope.

[0022] By adopting the technical scheme, the reversing wheel can effectively change the direction of the pull rope, so that the force of the pull rope is more evenly transmitted to the first detection piece, thereby improving the stability of the adjusting assembly. At the same time, the reversing wheel can also reduce the friction between the pull rope and the first arm, and prolong the service life of the pull rope.

[0023] Optionally, a scale is arranged on the guide rail and used for marking the distance between the first detection piece and the second detection piece.

[0024] By adopting the technical scheme, the scale ruler is arranged to enable an operator to intuitively read the relative distance between the first detection member and the second detection member, so that the position of the first detection member can be more accurately adjusted, and the limit device can be triggered in time when the boom is extended to the preset position, thereby improving the accuracy and reliability of the boom extension.

[0025] To sum up, the present application has at least one of the following beneficial technical effects:

[0026] 1. By arranging the first detection member and the second detection member on the first arm and the second arm respectively, the extension action of the boom is automatically stopped when the two detection members abut, effectively avoiding the risk of excessive extension of the boom, and improving the safety of the operation;

[0027] 2. The first detection member is slidingly connected with the first arm and is adjusted in position by the adjusting assembly, so that the device can adapt to the extension length of the boom under different operation requirements, improving the flexibility and application range of the device;

[0028] 3. The limit device automatically detects and controls, replacing the traditional manual measurement and experience judgment, significantly improving the accuracy of the boom extension, reducing errors caused by human factors, and improving the operation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall structure of the present application.

[0030] Figure 2 is a schematic diagram of the cross-sectional view of the first arm.

[0031] Figure 3 is Figure 1 is an enlarged schematic view of position A in

[0032] BRIEF DESCRIPTION OF DRAWINGS 11, first arm; 111, sliding groove; 112, reversing wheel; 12, second arm; 2, first detection member; 21, mounting plate; 3, second detection member; 4, adjusting assembly; 41, pull spring; 42, pull rope; 43, fixing member; 431, guide rail; 432, mounting block; 433, abutting bolt; 434, sliding groove. DETAILED DESCRIPTION

[0033] The present application will be described in detail below with reference to the accompanying drawings. Figures 1-3 The present application will be described in detail below with reference to the accompanying drawings.

[0034] The present application discloses a boom extension limit device for a truck crane, which is installed on the boom of the truck crane, and the truck crane comprises a plurality of booms which are sleeved together end to end. Figure 1 The present application discloses a boom extension limit device for a truck crane, which is installed on the boom of the truck crane, and the truck crane comprises a plurality of booms which are sleeved together end to end. The present application discloses a boom extension limit device for a truck crane, which is installed on the boom of the truck crane, and the truck crane comprises a plurality of booms which are sleeved together end to end.Figure 1 and Figure 2 The automobile crane boom length limiting device comprises a first detection piece 2 installed on the first arm 11 and a second detection piece 3 installed on the second arm 12. When the boom of the automobile crane is lengthened, the second arm 12 will slide in the first arm 11, so that the second detection piece 3 approaches the direction where the first detection piece 2 is located. When the second detection piece 3 slides to the first detection piece 2, the first detection piece 2 will detect that the automobile crane is configured to stop when the first detection piece 2 detects the second detection piece 3.

[0035] Specifically, the first detection piece 2 is connected with the control system of the automobile crane through a PLC controller. When the first detection piece 2 detects the second detection piece 3, it means that the second detection piece 3 has slid to the first detection piece 2. At this time, the first detection piece 2 outputs a signal that the second detection piece 3 has arrived, and the PLC controller outputs a stop signal after receiving the signal. The control system of the automobile crane receives the stop signal and controls the boom to stop, thereby achieving precise control of the length of the boom.

[0036] It can be understood that the booms of the automobile crane are scaled proportionally. When the length of the extension between two booms is fixed, the length of the extension of the entire boom of the automobile crane is also fixed.

[0037] In an example of the present application, the first detection piece 2 can be a travel switch installed on the inner wall of the first arm 11. At this time, the second detection piece 3 is a first contact block installed on the outer wall of the second arm 12. The travel switch generally consists of a contact and a spring. When the first contact block contacts the contact of the travel switch, the first contact block abuts the contact of the travel switch to close, and sends a signal to the control system of the automobile crane through the PLC controller to make the boom stop moving.

[0038] In another example of the present application, the first detection piece 2 can also be a proximity switch, and the second detection piece 3 is a second contact block fixed on the second arm 12. When the second arm 12 slides relative to the first arm 11 so that the second contact block reaches the proximity switch, the proximity switch will detect it, thereby judging the sliding position of the second arm 12.

[0039] In a third example of the present application, the first detection piece 2 can be a signal receiver, and the second detection piece 3 is a signal transmitter fixed on the outer wall of the second arm 12. When the second arm 12 slides in the first arm 11 so that the signal transmitter slides to the signal receiver, the signal receiver can receive the signal emitted by the signal transmitter. At this time, the PLC controller will control the boom of the automobile crane to stop. The signal transmitter and the receiver can use wireless communication technology such as Bluetooth or Wi-Fi to achieve long-distance non-contact detection.

[0040] Referring to Figure 2 and Figure 3, in order to realize the adjustment of the first detection piece 2 position, to adjust the telescopic length of the truck crane boom, the first detection piece 2 is provided with a sliding connection with the first arm 11, and an adjusting assembly 4 for driving the first detection piece 2 to slide is arranged on the outer wall of the first arm 11. The first detection piece 2 can be driven to slide on the first arm 11 by the adjusting assembly 4, so as to change the initial distance between the first detection piece 2 and the second detection piece 3.

[0041] Specifically, the first detection piece 2 is fixedly connected with a mounting plate 21 at one end, and a sliding groove 111 for embedding and sliding of the mounting plate 21 is formed in the inner wall of the first arm 11. By operating the mounting plate 21 to slide in the sliding groove 111, the position of the first detection piece 2 on the first arm 11 can be adjusted.

[0042] Referring to Figure 2 and Figure 3 , the adjusting assembly 4 includes a pulling spring 41 fixedly connected between one end of the sliding groove 111 and the mounting plate 21, and a pull rope 42 fixedly connected at the end of the mounting plate 21 away from the pulling spring 41. The end of the pull rope 42 away from the mounting plate 21 extends along the length direction of the first arm 11 and leaks out of the first arm 11. A fixing member 43 for fixing the free end of the pull rope 42 on the first arm 11 is arranged on the mounting arm.

[0043] The fixing member 43 includes a guide rail 431 fixedly connected to the outer wall of the first arm 11, a mounting block 432 slidingly connected in the guide rail 431, and a clamping screw 433 threadedly connected to the mounting block 432. A sliding groove 434 for sliding of the clamping screw 433 is formed in the guide rail 431, and the free end of the pull rope 42 is fixedly connected to the mounting block 432. By operating the mounting block 432 to slide in the guide rail 431, the mounting plate 21 can be driven to slide in the sliding groove 111 by the pull rope 42, so as to adjust the position of the first detection piece 2 on the first arm 11, thereby realizing the adjustment of the position of the first detection piece 2. When the adjustment is completed, the clamping screw 433 is directly operated to be screwed on the mounting block 432, so that the mounting block 432 and the head of the clamping screw 433 are clamped on the guide rail 431, thereby fixing the position of the mounting block 432 on the guide rail 431. When the pull rope 42 pulls the mounting plate 21, the pulling spring 41 will be in an elongated state. When the force applied to the pull rope 42 is released, the mounting plate 21 will be driven to approach the direction of the pulling spring 41 under the elastic force of the pulling spring 41, so that the pull rope 42 is in a tensioned state.

[0044] Among them, the first arm 11 is rotatably connected with a reversing wheel 112 at one end. After the free end of the pull rope 42 extends out of the first arm 11, it reaches the outer wall of the first arm 11 after being reversed by the reversing wheel 112 and is fixedly connected to the mounting block 432.

[0045] Wherein, the scale line can also be arranged on the guide rail 431, so that the position of the mounting block 432 on the guide rail 431 can be adjusted according to the scale line, so as to more conveniently adjust the distance between the first detection piece 2 and the second detection piece 3, and realize the accurate adjustment of the length of the extension of the arm of the automobile crane.

[0046] The implementation principle of the embodiment of the automobile crane arm extension limiting device is as follows: before use, the position of the mounting block 432 on the guide rail 431 is first adjusted according to the length of the arm to be extended, and the position of the mounting block 432 is directly observed according to the scale line, when the mounting block 432 is slid to the set position of the guide rail 431, the mounting block 432 is fixed on the guide rail 431 by the abutting bolt 433. At this time, the mounting block 432 also slides in the sliding groove 111 through the pull rope 42, so that the first detection piece 2 is located at the set position of the sliding groove 111. When the arm of the automobile crane is extended, the second arm 12 also slides in the first arm 11, and the second arm 12 also drives the second detection piece 3 to slide towards the first detection piece 2, when the second detection piece 3 slides to the first detection piece 2, the first detection piece 2 can detect, at this time, the PLC controller transmits a signal to the control system of the automobile crane, so that the extension of the arm of the automobile crane is stopped, and the accurate control of the length of the extension of the arm is realized. When the length of the extension of the arm of the automobile crane needs to be controlled differently in different occasions, only the mounting block 432 needs to be slid on the guide rail 431, and the length of the extension of the arm of the automobile crane can be adjusted.

[0047] Of course, the alarm can also be installed in the cab of the automobile crane, when the second detection piece 3 reaches the first detection piece 2, the alarm alarms to remind the driver.

[0048] The above are the preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. An extension limiting device for a derrick boom of a mobile crane, the mobile crane comprising a plurality of derrick booms telescopically arranged one inside another, wherein two adjacent derrick booms are referred to as a first boom (11) and a second boom (12), the first boom (11) being telescopically arranged on the second boom (12), characterized in that: The automobile crane comprises a first detection member (2) mounted on the first arm (11) and a second detection member (3) mounted on the second arm (12), and is configured to stop when the second detection member (3) abuts against the first detection member (2).

2. The extension limiting device of the automobile crane boom according to claim 1, characterized in that: The first detection member (2) is a travel switch, and the second detection member (3) is a first contact block fixed to the second arm (12).

3. The extension limiting device of the automobile crane boom according to claim 1, characterized in that: The first detection member (2) is a proximity switch, and the second detection member (3) is a second contact block fixed to the second arm (12).

4. The extension limiting device of the automobile crane boom according to claim 1, characterized in that: The first detection member (2) is a signal receiver, and the second detection member (3) is a signal transmitter fixed to the second arm (12) for emitting a signal, and the signal receiver can receive the signal emitted by the signal transmitter.

5. The extension limiting device of the automobile crane boom according to any one of claims 1-4, characterized in that: The first detection member (2) is in sliding connection with the first arm (11), and an adjusting assembly (4) for driving the first detection member (2) to slide relative to the first arm (11) is arranged outside the first arm (11).

6. The extension limiting device of the automobile crane boom according to claim 5, characterized in that: One end of the first detection member (2) is fixed with a mounting plate (21), and a sliding groove (111) for embedding and sliding of the mounting plate (21) is formed in the inner wall of the first arm (11).

7. The extension limiter of a spreader boom of a spreader according to claim 6, characterized in that: The adjusting assembly (4) comprises a pulling spring (41) fixed between one end of the sliding groove (111) and the mounting plate (21), a pull rope (42) fixed to the end of the mounting plate (21) away from the pulling spring (41), and a fixing member (43) arranged on the outer wall of the first arm (11) for fixing the position of the end of the pull rope (42) away from the mounting plate (21), and the end of the pull rope (42) away from the mounting plate (21) is exposed to the outside from one end of the first arm (11).

8. The extension limiting device of the automobile crane boom according to claim 7, characterized in that: The fixing member (43) comprises a guide rail (431) fixed to the outer wall of the first arm (11), a mounting block (432) in sliding connection in the guide rail (431), and a pressing bolt (433) in threaded connection on the mounting block (432), a sliding groove (434) for sliding of the pressing bolt (433) is formed in the guide rail (431), and the end of the pull rope (42) away from the mounting plate (21) is fixed to the mounting block (432).

9. The extension limiter of a spreader boom of a spreader according to claim 8, characterized in that: One end of the first arm (11) is rotatably connected with a reversing wheel (112) for reversing the pull rope (42).

10. The extension limiter of the automobile crane jib according to claim 8, characterized in that: The guide rail (431) is provided with a scale for identifying the distance between the first detection member (2) and the second detection member (3).

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