Lorry-mounted crane

Abstract

The utility model relates to the technical field of cranes, and discloses a lorry-mounted crane, which comprises an underframe, a rotary table, a lifting mechanism and a lifting mechanism, the hydraulic driving system for the cargo boom comprises a driving oil cylinder for driving the cargo boom to act and a hydraulic pipeline for supplying hydraulic oil to the driving oil cylinder, the hydraulic pipeline comprises a fixed pipeline part of which one end is connected with a central rotary joint and a rotation following pipeline part which is connected to the fixed pipeline part through the central rotary joint so as to rotate along with the rotary table; and the rotation locking device comprises a hydraulic locking mechanism used for locking the rotation position of the rotary table, and the hydraulic locking mechanism comprises a locking hydraulic pipeline connected to the rotation following pipeline part so that the rotation position of the rotary table can be locked or released by obtaining hydraulic pressure from the locking hydraulic pipeline. By means of the technical scheme, winding and knotting of the hydraulic pipeline are avoided in the rotating process of the rotary locking device, and cost is low.

Description

Truck-mounted crane Technical Field

[0001] This utility model relates to the field of crane technology, and specifically to a truck-mounted crane. Background Technology

[0002] A truck-mounted crane consists of a turntable and a base frame. A slewing support is installed between the turntable and the base frame. The turntable can rotate on the base frame. When the truck-mounted crane is being transported, it is necessary to ensure that the turntable and the base frame remain relatively stationary. A slewing locking device is usually installed to control the locking of the turntable.

[0003] The rotary locking device includes a pin installed between the turntable and the base frame. It is hydraulically driven and automatically controlled to lock the turntable in place, preventing rotation. However, during turntable rotation, the rotary locking device rotates with the turntable, causing the hydraulic lines to become tangled and knotted. Summary of the Invention

[0004] The purpose of this invention is to overcome the problem in the existing technology where the rotary locking device rotates with the turntable during rotation, causing the hydraulic lines to become entangled and knotted.

[0005] To achieve the above objectives, this utility model provides a truck-mounted crane, comprising:

[0006] The base frame is equipped with a rotatable turntable.

[0007] A crane boom hydraulic drive system includes a drive cylinder for driving the crane boom's movement and hydraulic lines for supplying hydraulic oil to the drive cylinder. The hydraulic lines include a fixed section with one end connected to a central swivel joint and a follow-through section connected to the fixed section via the central swivel joint to rotate with the turntable; and...

[0008] A rotary locking device includes a hydraulic locking mechanism for locking the rotary position of a turntable. The hydraulic locking mechanism includes a locking hydraulic line connected to a follow-rotation pipeline section, which allows the rotary position of the turntable to be locked or released by obtaining hydraulic pressure from the locking hydraulic line.

[0009] In some embodiments, the hydraulic locking mechanism further includes a locking cylinder and an electrically controlled directional valve disposed on the locking hydraulic line. The locking hydraulic line is configured to supply hydraulic oil to the locking cylinder and control the extension and retraction direction of the locking cylinder through the electrically controlled directional valve.

[0010] In some embodiments, the rotary locking device further includes a pin and a socket. The pin is movably connected to the turntable, and the socket is located on the base frame and has a corresponding insertion hole. The locking cylinder can drive the pin to move vertically and insert the pin into the insertion hole to lock the turntable or pull the pin out of the insertion hole to release the turntable.

[0011] In some embodiments, the rodless chamber of the locking cylinder is located above the rod chamber, the lower end of the piston rod of the locking cylinder is connected to a pin, and the locking hydraulic line can supply oil to the rodless chamber to move the piston rod and the pin downward, or supply oil to the rod chamber to move the piston rod and the pin upward.

[0012] In some embodiments, a connector is provided between the output end of the locking cylinder and the socket.

[0013] In some embodiments, the rotary locking device further includes a detector and a control center. The detector is located on the socket and is capable of detecting whether a pin is inserted in the socket. The detector is capable of transmitting a signal to the control center, which is configured to control the switching position of the electrically controlled directional valve according to the signal from the detector.

[0014] In some embodiments, the detector includes an upper detector and a lower detector, which are arranged at intervals along the vertical direction of the socket.

[0015] In some embodiments, the upper detector and the lower detector are contact switches.

[0016] In some embodiments, the rotary locking device further includes a guide sleeve arranged in a vertical direction. The upper end of the guide sleeve is connected to the locking cylinder and the lower end is fixedly connected to the turntable. A pin is disposed in the cavity of the guide sleeve and slides in contact with the inner wall of the guide sleeve. The lower end of the guide sleeve and the turntable are provided with through holes to allow the pin to pass through. The locking cylinder can drive the pin to reciprocate along the length direction of the guide sleeve.

[0017] In some embodiments, the guide sleeve is provided with a grease fitting.

[0018] Through the above technical solution, the truck-mounted crane of this utility model connects the locking hydraulic pipeline of the slewing locking device to the rotating pipeline section that rotates together with the turntable, so that the slewing locking device avoids the hydraulic pipeline from getting tangled and knotted during rotation, and the cost is low. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the hydraulic pipeline of an embodiment of the present invention;

[0020] Figure 2 shows the front view of the crane according to an embodiment of the present invention;

[0021] Figure 3 is a left view of Figure 2, where part A is a schematic diagram of the turntable rotation locking device;

[0022] Figure 4 is an enlarged view of part A in Figure 3.

[0023] Explanation of reference numerals in the attached figures

[0024] 1. Pin; 2. Socket; 3. Hydraulic locking mechanism; 31. Locking hydraulic line; 32. Locking cylinder; 321. Rodless chamber; 322. Rod chamber; 323. Piston rod; 33. Electrically controlled directional valve; 4. Detector; 41. Upper detector; 42. Lower detector; 5. Guide sleeve; 51. Grease fitting; 6. Connector; 7. Turntable; 8. Base frame; 9. Hydraulic line; 91. Fixed line section; 92. Rotating line section; 10. Drive cylinder; 11. Central rotary joint. Detailed Implementation

[0025] In this invention, unless otherwise stated, directional terms such as "up," "down," "left," "right," "inner," and "outer" are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] To address the problem in existing technologies where the slewing locking device rotates along with the turntable during rotation, causing hydraulic lines to become entangled and knotted, this invention provides a truck-mounted crane, as shown in Figures 2 and 3. A rotatable turntable 7 is mounted on the crane's base frame 8, and the boom rotates via the turntable 7. The crane also includes a boom hydraulic drive system, as shown in Figure 1. Hydraulic lines 9 supply hydraulic oil to drive cylinders 10, which in turn drive the boom's extension and / or lifting. A central rotary joint 11 is located between the turntable 7 and the base frame 8, dividing the hydraulic lines 9 into a fixed section 91 and a rotating section 92. One end of the fixed section 91 is connected to a hydraulic pump, and the other end is connected to the central rotary joint 11. The rotating section 92 rotates with the turntable 7, and the central rotary joint 11 prevents the hydraulic lines 9 from becoming entangled and knotted due to the rotation of the turntable 7. The truck-mounted crane also includes a slewing locking device, which can lock the turntable 7, keeping it relatively stationary with respect to the underframe 8 during transport. The slewing locking device includes a hydraulic locking mechanism 3 for locking the slewing position of the turntable 7. The hydraulic locking mechanism 3 includes a locking hydraulic line 31 connected to the slewing pipeline section 92. The locking hydraulic line 31 can obtain hydraulic pressure through the slewing pipeline section 92 to lock or release the slewing position of the turntable 7, and rotates together with the slewing pipeline section 92 without pipeline entanglement.

[0027] Through the above technical solution, the truck-mounted crane of this utility model connects the locking hydraulic pipeline of the slewing locking device to the rotating pipeline section that rotates together with the turntable, so that the slewing locking device avoids the hydraulic pipeline from getting tangled and knotted during rotation, and does not require a separate central slewing joint, thus reducing costs.

[0028] In some embodiments, as shown in FIG1, the hydraulic locking mechanism 3 further includes a locking cylinder 32 and an electrically controlled directional valve 33 disposed on the locking hydraulic line 31. The locking hydraulic line 31 can supply hydraulic oil to the locking cylinder 32, and the electrically controlled directional valve 33 controls the oil inlet direction of the locking cylinder 32, thereby controlling the extension and retraction direction of the locking cylinder 32. The electrically controlled directional valve 33 can be a dual electrically controlled solenoid valve or a pneumatic directional valve in the prior art, preferably a dual electrically controlled solenoid valve.

[0029] In some embodiments, as shown in FIG4, the rotary locking device further includes: a pin 1 and a socket 2. The pin 1 is movably connected to the turntable 7, and the socket 2 is provided on the base frame 8. The socket 2 is provided with a socket hole corresponding to the pin 1. The locking cylinder 32 can drive the pin 1 to move in the vertical direction, so that the pin 1 is inserted into the socket hole to lock the turntable 7, or so that the pin 1 is pulled out from the socket hole 21 to release the turntable 7.

[0030] In some embodiments, as shown in Figures 1 and 4, the rodless chamber 321 of the locking cylinder 32 is located above the rod chamber 322, and the lower end of the piston rod 323 of the locking cylinder 32 is connected to the pin 1. When the locking hydraulic line 93 supplies oil to the rodless chamber 321, the piston rod 323 and the pin 1 move downward, causing the pin 1 to enter the socket 2 and lock the turntable 7; when the locking hydraulic line 93 supplies oil to the rod chamber 322, the piston rod 323 and the pin 1 move upward, causing the pin 1 to be pulled out of the socket 2 and release the turntable 7.

[0031] In some embodiments, as shown in FIG4, a connector 6 is provided between the output end of the locking cylinder 32 and the socket 2. The connector 6 can be a floating connector in the prior art. The floating connector is connected to the output end of the locking cylinder 32 and the socket 2 by bolts. It can adaptively adjust the angle and position offset between the piston rod of the locking cylinder 32 and the socket 2, avoid damage caused by stress concentration, reduce friction and wear, and extend service life.

[0032] In some embodiments, the rotary locking device further includes a detector 4 and a control center. The detector 4 is located on the socket 2 and can detect whether a pin 1 is inserted in the socket 2. The detector 4 transmits the signal indicating whether a pin 1 is inserted in the socket 2 to the control center. The control center controls the reversing position of the electrically controlled directional valve 33 according to the signal from the detector 4. Specifically, when the turntable 7 needs to be locked, the detector 4 detects that there is no pin 1 in the socket 2. The control center controls the electrically controlled directional valve 33 to extend the output end of the locking cylinder 32, driving the pin 1 to move downward until the detector 4 detects that a pin 1 is inserted in the socket 2, and the output end of the locking cylinder 32 stops extending. When the turntable 7 needs to be released, the control center controls the electrically controlled directional valve 33 to retract the output end of the locking cylinder 32, driving the pin 1 to move upward until the detector 4 detects that there is no pin 1 in the socket 2, and after moving upward for a certain distance, the output end of the locking cylinder 32 stops retracting. In addition, by placing the detector 4 on the socket 2, information about whether the pin 1 is in the socket 1 can be obtained directly, so as to understand the insertion and removal status of the pin more accurately and make the entire turntable rotation locking device operate more precisely.

[0033] In some embodiments, as shown in Figures 2 to 4, detector 4 includes an upper detector 41 and a lower detector 42, which are arranged at intervals along the vertical direction of socket 2. The slewing locking device also includes an alarm, which is located at any position on the truck-mounted crane that is easily visible to the operator, such as on the control box. The alarm communicates with the control center and can issue an audible and visual alarm. The upper detector 41 and the lower detector 42 are configured for dual sensing. Before the truck-mounted crane is transported, the alarm will sound if either the upper detector 41 or the lower detector 42 fails to detect the pin 1 or if neither of them detects the pin 1. The alarm will only be deactivated when both the upper detector 41 and the lower detector 42 detect that the pin 1 is inserted in socket 2, allowing the truck-mounted crane to be transported. This configuration prevents damage to components caused by human error in forgetting to insert the pin 1 and by random vibrations and impacts during transport of the truck-mounted crane.

[0034] In some embodiments, the upper detector 41 and the lower detector 42 are contact switches. It is understood that the upper detector 41 and the lower detector 42 may also be proximity switches in the prior art, or any detector or sensor that can accurately detect the position of the pin 1 in the socket 2.

[0035] In some embodiments, as shown in FIG4, the rotary locking device further includes a guide sleeve 5 arranged vertically, which guides the movement direction of the pin 1. The upper end of the guide sleeve 5 is fixedly connected to the locking cylinder 32 and the lower end is fixedly connected to the turntable 7. The pin 1 is disposed in the cavity of the guide sleeve 5 and slides in contact with the inner wall of the guide sleeve 5. The locking cylinder 32 drives the pin 1 to reciprocate along the length direction of the guide sleeve 5. The lower end of the guide sleeve 5 and the turntable 7 are provided with through holes to allow the pin 1 to pass through, so that the pin 1 can be inserted into the socket hole of the socket 2.

[0036] In some embodiments, as shown in FIG4, the guide sleeve 5 is provided with a grease nipple 51, which is connected to the gap between the guide sleeve 5 and the pin 1, and is used to lubricate the gap between the guide sleeve 5 and the pin 1 with grease so that the pin 1 can slide smoothly inside the guide sleeve 5.

[0037] The following describes in detail the operation of the slewing locking device of the truck-mounted crane according to this utility model embodiment: When it is necessary to lock the turntable 7, the control center controls the left side of the dual-electro-controlled solenoid valve to move, oil enters the rodless chamber 321 of the locking cylinder 32, and the piston rod 323 drives the pin 1 to move downward together through the connector 6. When the pin 1 moves downward to a certain distance, the upper detector 41 detects the pin 1 and transmits a signal to the control center. The pin 1 continues to move downward, and the lower detector 42 detects the pin 1 and transmits a signal to the control center. After receiving the signal, the control center controls the dual-electro-controlled solenoid valve to return to the neutral position, and the rodless chamber 321 of the locking cylinder 32 stops moving downward. When oil is added again, pin 1 stops moving, the alarm stops sounding, and the locking of turntable 7 is completed. When turntable 7 needs to be released, the control center controls the right side of the dual-electro-controlled solenoid valve to move, oil is introduced into the rod chamber 322 of the locking cylinder 32, and the piston rod 323 drives pin 1 to move upward together through connector 6. When pin 1 moves upward to the point where the upper detector 41 detects that there is no pin 1 in the socket 2, it transmits a signal to the control center. After receiving the signal, the control center controls pin 1 to continue moving a certain distance and then controls the dual-electro-controlled solenoid valve to return to the neutral position. At this time, oil is no longer introduced into the rod chamber 322 of the locking cylinder 32, pin 1 stops moving, and the release of turntable 7 is completed.

[0038] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A truck-mounted crane, characterized in that, include: A base frame (8) on which a rotatable turntable (7) is mounted; a boom hydraulic drive system, the boom hydraulic drive system including a drive cylinder (10) for driving the boom and a hydraulic line (9) for supplying hydraulic oil to the drive cylinder (10), the hydraulic line (9) including a fixed line section (91) with one end connected to a central swivel joint (11) and connected to the fixed line section through the central swivel joint (11). (91) A rotatable pipeline section (92) that can rotate with the turntable (7); and a rotation locking device, the rotation locking device including a hydraulic locking mechanism (3) for locking the rotation position of the turntable (7), the hydraulic locking mechanism (3) including a locking hydraulic line (31) connected to the rotatable pipeline section (92) so as to lock or release the rotation position of the turntable (7) by obtaining hydraulic pressure from the locking hydraulic line (31).

2. The truck-mounted crane according to claim 1, characterized in that, The hydraulic locking mechanism (3) further includes a locking cylinder (32) and an electrically controlled directional valve (33) provided on the locking hydraulic line (31). The locking hydraulic line (31) is configured to supply hydraulic oil to the locking cylinder (32) and control the extension and retraction direction of the locking cylinder (32) through the electrically controlled directional valve (33).

3. The truck-mounted crane according to claim 2, characterized in that, The rotary locking device further includes a pin (1) and a socket (2). The pin (1) is movably connected to the turntable (7). The socket (2) is located on the base frame (8) and has a corresponding insertion hole for the pin (1). The locking cylinder (32) can drive the pin (1) to move vertically and insert the pin (1) into the insertion hole to lock the turntable (7) or pull the pin (1) out of the insertion hole (21) to release the turntable (7).

4. The truck-mounted crane according to claim 3, characterized in that, The rodless chamber (321) of the locking cylinder (32) is located above the rod chamber (322). The lower end of the piston rod (323) of the locking cylinder (32) is connected to the pin (1). The locking hydraulic line (93) can supply oil to the rodless chamber (321) to make the piston rod (323) and the pin (1) move downward, or supply oil to the rod chamber (322) to make the piston rod (323) and the pin (1) move upward.

5. The truck-mounted crane according to claim 3, characterized in that, A connector (6) is provided between the output end of the locking cylinder (32) and the socket (2).

6. The truck-mounted crane according to claim 3, characterized in that, The rotary locking device also includes a detector (4) and a control center. The detector (4) is located on the socket (2) and can detect whether the pin (1) is inserted in the socket (2). The detector (4) can transmit a signal to the control center. The control center is configured to control the switching position of the electronically controlled reversing valve (33) according to the signal from the detector (4).

7. The truck-mounted crane according to claim 6, characterized in that, The detector (4) includes an upper detector (41) and a lower detector (42), which are arranged at intervals along the vertical direction of the socket (2).

8. The truck-mounted crane according to claim 7, characterized in that, The upper detector (41) and the lower detector (42) are contact switches.

9. The truck-mounted crane according to claim 3, characterized in that, The rotary locking device also includes a guide sleeve (5) arranged in the vertical direction. The upper end of the guide sleeve (5) is connected to the locking cylinder (32) and the lower end is fixedly connected to the turntable (7). The pin (1) is located in the cavity of the guide sleeve (5) and slides in contact with the inner wall of the guide sleeve (5). The lower end of the guide sleeve (5) and the turntable (7) are provided with through holes to allow the pin (1) to pass through. The locking cylinder (32) can drive the pin (1) to reciprocate along the length direction of the guide sleeve (5).

10. The truck-mounted crane according to claim 9, characterized in that, The guide sleeve (5) is provided with a grease nipple (51).

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