Automatic rotary table locking device and crane

Abstract

The utility model belongs to the technical field of engineering machinery, and particularly relates to an automatic rotary table locking device and a crane. The rotary table automatic locking device comprises a sleeve arranged on a rotary table, a telescopic cylinder is arranged on the sleeve, a locking pin is connected into the sleeve in a sliding mode, and a piston rod of the telescopic cylinder is connected with the locking pin through a knuckle bearing; the pin shaft hole is formed in the frame and is matched with the locking pin. The telescopic cylinder drives the locking pin to move to lock the rotary table, the knuckle bearing is arranged between the piston rod and the locking pin, and the knuckle bearing rotates to fully release the load of the locking pin caused by unbalance loading; the driving part and the lead screw pair of the telescopic cylinder are both arranged in the housing, so that the problem of locking stagnation caused by exposure and corrosion of the driving mechanism is avoided; the rotary table automatic locking device is electrically driven, the cost is greatly reduced, and the system is simplified.

Description

Technical Field

[0001] This application belongs to the field of engineering machinery technology, and in particular relates to an automatic locking device for a turntable and a crane. Background Technology

[0002] The turntable, as a crucial component of the crane's upper structure, exists in two states: locked and unlocked. During normal operation, the turntable and the frame must be relatively fixed to prevent rotation during travel, which could affect safe operation; this is the locked state. During operation, when lifting heavy objects, the turntable needs to rotate freely relative to the frame to achieve slewing; this is the unlocked state. To achieve locking between the turntable and the frame, a turntable locking device is typically installed on the turntable, and a pin hole is provided on the frame.

[0003] Currently, most turntable locking devices employ two methods: manual locking and hydraulic cylinder-driven locking. Manual locking involves manually inserting and removing the locking pin from its hole to lock and unlock the turntable. While this method is less expensive, relying entirely on manual operation poses certain risks, requiring operators to leave the control room to insert and remove the locking pin, which is time-consuming, labor-intensive, and inefficient.

[0004] Patent CN215626379U discloses an automatic locking device for a turntable and a crane, including a drive mechanism, guide bushing, spring components, locking pin, limit pin, proximity switch, etc. Under the action of the drive mechanism (motor + cam), the locking pin moves up and down to automatically unlock or lock the turntable and the frame, eliminating the need for manual insertion and removal of the pin by the operator, thus improving the crane's working efficiency. However, the exposed cam of the drive mechanism is prone to rust and wear, leading to jamming or poor positioning accuracy of the locking device. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this application provides an automatic locking device for a turntable and a crane, which can avoid locking jamming caused by exposed corrosion of the drive mechanism.

[0006] To achieve the above objectives, the technical solution provided in this application is as follows:

[0007] In a first aspect, this application provides an automatic locking device for a turntable, including a sleeve disposed on the turntable, a telescopic cylinder disposed on the sleeve, a locking pin slidably connected inside the sleeve, and a piston rod of the telescopic cylinder connected to the locking pin via a spherical bearing; it also includes a pin hole disposed on the frame for use with the locking pin; and a cover is provided on the telescopic rod.

[0008] Optionally, the telescopic cylinder includes a cylinder barrel, a piston rod, a lead screw assembly, and a driving component. The driving component is used to drive the lead screw of the lead screw assembly to rotate. The nut of the lead screw assembly is slidably connected to the cylinder barrel. The piston rod is connected to the nut of the lead screw assembly. The cylinder barrel is connected to the sleeve through a flange.

[0009] Optionally, it also includes a connecting pin, with ear plates on both sides of the locking pin, the end of the piston rod located between the two ear plates, the connecting pin passing through one ear plate and the piston rod in sequence and then exiting from the other ear plate, and one end of the connecting pin being fixed by a positioning pin.

[0010] Optionally, the cylinder is provided with a first limit switch and a second limit switch, which are used to limit the nut stroke of the lead screw pair.

[0011] Optionally, the system also includes a controller, wherein the first limit switch and the second limit switch are proximity switches, the first limit switch and the second limit switch are connected to the signal input terminal of the controller, and the output terminal of the controller is connected to the drive unit.

[0012] Optionally, the telescopic cylinder is an electric cylinder.

[0013] Optionally, the driving component includes a motor, which is connected to the lead screw pair via a reduction mechanism.

[0014] Optionally, a limit block is provided on the locking pin.

[0015] Secondly, this application also provides a crane, including the aforementioned automatic turntable locking device, turntable, and frame, wherein the sleeve of the automatic turntable locking device is connected to the turntable, and the pin hole is provided on the frame.

[0016] Compared with the prior art, this application has at least the following beneficial effects:

[0017] This application achieves turntable locking by driving the locking pin to move using a telescopic cylinder. A spherical bearing is installed between the piston rod and the locking pin. The rotation of the spherical bearing can fully release the load on the locking pin caused by off-center loading. By embedding the drive component and lead screw of the telescopic cylinder inside the housing, the locking jamming problem caused by the exposed drive mechanism and corrosion is avoided. The automatic locking device of the turntable adopts electric drive, replacing the traditional hydraulic system with proximity switch mode, which greatly reduces costs and simplifies the system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an automatic turntable locking device according to an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the unlocked state of an automatic turntable locking device in an embodiment of this application;

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Telescopic cylinder; 101. Motor; 102. Controller; 103. Reduction mechanism; 104. Lead screw pair; 105. Piston rod; 106. Spherical bearing; 107. First limit switch; 108. Second limit switch; 2. Sleeve; 3. Locking pin; 4. Connecting pin; 5. Positioning pin; 6. Turntable; 7. Frame; 8. Cover; 9. Flange. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use.

[0024] Example 1

[0025] like Figure 1 As shown, an automatic locking device for a turntable includes a sleeve 2 mounted on a turntable 6, a telescopic cylinder 1 mounted on the sleeve 2, a locking pin 3 slidably connected inside the sleeve 2, and a piston rod 105 of the telescopic cylinder 1 connected to the locking pin 3 via a spherical bearing 106; it also includes a pin hole mounted on a frame 7 for use with the locking pin 3; and a cover 8 is provided on the outside of the telescopic cylinder 1.

[0026] The locking pin 3 is driven by the telescopic cylinder 1 to slide along the sleeve 2. The locking pin 3 can be inserted into the pin hole to lock the turntable 6. A spherical bearing 106 is set between the piston rod 105 and the locking pin 3. The rotation of the spherical bearing 106 can fully release the load caused by the off-center load of the locking pin 3. The driving component of the telescopic cylinder 1 and the lead screw pair 104 are both built into the cover 8 to avoid the locking jamming problem caused by the exposed drive mechanism rusting.

[0027] Example 2

[0028] The difference between this embodiment and Embodiment 1 is that it also includes a connecting pin 4. Ear plates are fixedly connected to both sides of the locking pin 3. The end of the piston rod 105 is located between the two ear plates. The connecting pin 4 passes through one ear plate and the piston rod 105 in sequence and then exits from the other ear plate. One end of the connecting pin 4 is fixed by a positioning pin 5. The stress on the locking pin 3 caused by off-center loading can be fully released by the rotation of the spherical bearing 106.

[0029] The telescopic cylinder includes a cylinder barrel, a piston rod 105, a lead screw assembly 104, and a drive component. The drive component drives the lead screw of the lead screw assembly 104 to rotate. The nut of the lead screw assembly 104 is slidably connected to the cylinder barrel. The piston rod 105 is connected to the nut of the lead screw assembly 104. The cylinder barrel is connected to the sleeve 2 via a flange 9. The drive component includes a motor 101, which is connected to the lead screw assembly 104 via a reduction mechanism 103.

[0030] The cylinder is equipped with a first limit switch 107 and a second limit switch 108, which are used to limit the nut stroke of the lead screw assembly 104. A controller 102 is also included. The first limit switch 107 and the second limit switch 108 are proximity switches. The first limit switch 107 and the second limit switch 108 are connected to the signal input terminal of the controller 102, and the output terminal of the controller 102 is connected to the drive component.

[0031] When controller 102 receives a locking command, it drives motor 101 to run, which, via reduction mechanism 103, drives the lead screw of lead screw pair 104 to rotate. This causes the nut of lead screw pair 104 to slide up and down, piston rod 105 to extend, and locking pin 3 to insert into pin hole. In the locked state, the nut of lead screw pair 104 reaches the position of second limit switch 108. Second limit switch 108 transmits a signal to controller 102, and controller 102 controls motor 101 to stop running, and piston rod 105 to stop moving. When controller 102 receives an unlocking command, controller 102 controls motor 101 to move, causing lead screw pair 104 to rotate in the opposite direction. Nut and piston rod 105 retract. In the unlocked state, nut reaches first limit switch 107, first limit switch 107 transmits a signal to controller 102, and motor 101 stops moving.

[0032] The locking pin 3 is equipped with a limiting block, the diameter of which is larger than that of the locking pin, so that the locking pin 3 can be smoothly inserted into the pin hole and avoid displacement.

[0033] This application also provides a crane, including the above-mentioned automatic locking device for turntable 6, turntable 6 and frame 7, wherein the sleeve 2 of the automatic locking device for turntable 6 is connected to turntable 6, and the pin hole is provided on the frame 7.

[0034] The automatic locking device for the turntable in this application is electrically driven, replacing the traditional hydraulic system combined with a proximity switch, which greatly reduces costs and simplifies the system.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A rotary table automatic locking device, characterized in that, The automatic locking device for rotary table comprises a sleeve arranged on the rotary table, a telescopic cylinder arranged on the sleeve, a locking pin slidably connected in the sleeve, and a pin shaft hole arranged on a frame and matched with the locking pin.

2. The automatic locking device of the turntable according to claim 1, wherein The telescopic cylinder comprises a cylinder, a piston rod, a screw pair and a driving member.

3. The automatic locking device of the turntable according to claim 1, wherein The locking pin is provided with ear plates on both sides, and the end of the piston rod is located between the two ear plates.

4. The automatic locking device of the turntable according to claim 2, wherein The cylinder is provided with a first limit switch and a second limit switch.

5. The automatic locking device of the turntable according to claim 4, wherein The first limit switch and the second limit switch are connected with the signal input end of the controller, and the output end of the controller is connected with the driving member.

6. The automatic locking device of the turntable according to claim 1, wherein The telescopic cylinder is an electric cylinder.

7. The automatic locking device of the turntable according to claim 2, wherein The driving member comprises a motor connected with the screw pair through a speed reduction mechanism.

8. The automatic locking device of the turntable according to claim 1, wherein The locking pin is provided with a limit block.

9. A crane, characterized in that The automatic locking device for rotary table, the rotary table and the frame are provided in the application.

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