A tray mechanism for a crane limiter

Abstract

A kind of crane limiter tray mechanism, including support rod, the left end of support rod is fixed with limiting mechanism, it further include first support block and second support block, vertical through hole is formed in the first support block and the second support block, two vertical through holes are located at the outside of horizontal through hole, the top of first support block is provided with first notch, the both ends of first notch are communicated with vertical through hole, the bottom of second support block is provided with second notch, second notch is communicated with two vertical through holes on second support block, and it further include two U-shaped fixed rods, the both ends of fixed rod are provided with external thread, first support block and second support block are fixed on support rod by nut, and the left end of two support rods can be slidably assembled in strip-shaped through hole.The utility model discloses simple structure, convenient to use.

Description

Technical Field

[0001] This utility model belongs to the field of lifting accessories technology, and in particular relates to a pallet mechanism for a crane limiter. Background Technology

[0002] Crane limit switches include over-crane limit switches (height limiters), overload limit switches (lifting capacity limiters), and travel limit switches (travel limiters for the trolley and crane). The main function of the over-crane limit switch is to prevent the crane hook or other lifting device from exceeding its designed maximum working position. When the hook rises to its limit position, the height limit switch will automatically cut off the lifting power source to avoid over-crane accidents, thereby protecting the safety of equipment and personnel. The function of the overload limit switch is to prevent the crane from operating under overload. When the load exceeds the rated lifting capacity, the overload limit switch can automatically cut off the power supply to the lifting mechanism to stop or issue an alarm, thereby avoiding crane overturning or other safety accidents caused by overloading. For example, in the authorization announcement number CN216549381U, a lifting height limit switch connection device is disclosed, which discloses a lifting height limiter. Existing crane height limiters usually only install an encoder on the rotating shaft of the drum to measure the number of rotations of the drum to calculate the descent or ascent height of the wire rope. Since wire ropes often experience phenomena such as rope skipping, rope biting, or rope tangling, this method is prone to failure and the measurement is inaccurate. Therefore, the lifting height limiter in the prior art may cause the braking to be untimely due to errors, leading to accidents. Another method is to use a contact-type limiter, which is installed directly above the lifting device. When the lifting device rises to a certain height under the traction of the wire rope, the lifting device touches the contact of the limit switch, and then the limit switch automatically cuts off the power. However, because the switch contact in the prior art is small, it is easy for the lifting device to fail to touch the contact. The installation requirements are high and the installation is very inconvenient. Therefore, the existing crane lifting height limiter and overload limiter have the same installation and large error. Utility Model Content

[0003] This utility model addresses the technical problems of inconvenient installation and large errors in existing crane lifting height limiters and overload limiters by providing a pallet mechanism for crane limiters. The mechanism includes a pallet assembly mounted on the height limiter and the lifting capacity limiter (these are existing technologies and their structures are not described in detail here). A vertically arranged support plate is fixed to one side of the contact at the bottom of both devices. The support plate has two spaced-apart vertically arranged strip-shaped through holes. The pallet assembly includes two parallel-spaced support rods. The vertically arranged support plate, which provides support and fixation, is also fixed to one side of the contact at the bottom of the limiter. The support plate also has two parallel-spaced support rods. A limiting mechanism is fixed to the left end of each support rod, and the limiting mechanism includes a stop cap fixedly connected to the support rod. The diameter of the stop cap is larger than the width of the strip-shaped through holes on the support plate. It also includes a first support block and a second support block. Both the first support block and the second support block are provided with transverse through holes that correspond one-to-one with the two support rods. Both the first support block and the second support block are provided with two vertically arranged through holes, and the two vertical through holes are located outside the transverse through holes. The diameter of the transverse through holes is larger than the diameter of the support rods, and the support rods can slide through the transverse through holes. The first support block has a first slot at its top, with both ends of the first slot communicating with vertical through holes. The second support block has a second slot at its bottom, communicating with two vertical through holes on the second support block. It also includes two U-shaped fixing rods, the diameter of which is smaller than the diameter of the vertical through holes. Both ends of the fixing rods can pass through the vertical through holes, and both ends of the fixing rods have external threads. The first and second support blocks are fixed to the sub-support rods by nuts, and the left ends of the two support rods can be slidably fitted into the strip-shaped through holes. Under the action of the nuts, the upper ends of the fixing rods press and fix the two support rods to the first and second support blocks. When the crane lifting device moves upward under the traction of the wire rope, it touches the second support block and pushes the two support rods to rotate counterclockwise upward. The first support block contacts upward and pushes the contact head to move upward. The contact head moves upward and transmits a signal to the controller to cut off the power supply to the lifting drum, preventing the lifting drum from continuing to pull the lifting device upward by the wire rope.

[0004] Preferably, the upper left side of the first support block is provided with a beveled arc surface, which facilitates the first support block to rotate around the contact when the crane lifting device rises and touches the second support block.

[0005] Preferably, the lower left side of the first support block is provided with an inclined surface, which makes it easy to align the inclined surface with the support plate during installation, thus serving a positioning function.

[0006] Preferably, a wing nut is selected.

[0007] The above-mentioned approach has the following advantages: The first support block, the second support block, and the support rod are designed to be fixed together by a fixing rod and a fixing nut, and assembled into the strip-shaped through hole at the bottom of the limiter. This facilitates installation and increases the contact area with the crane lifting device, preventing the lifting device from failing to contact the contact point. The upper left side of the first support block has an arc-shaped surface, which facilitates the rotation of the first support block when the crane lifting device rises and touches the second support block. The lower left side of the first support block has an inclined surface, which facilitates flush installation with the support plate and serves a positioning function. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 3 Schematic diagram of the pallet device Figure 1 ; Figure 4 Schematic diagram of the tray device Figure 2 ; Figure 5 Schematic diagram of the pallet device Figure 3 ; Figure 6 This is a schematic diagram of the three-dimensional structure of the first support block.

[0009] Reference numerals: 1. Limiter; 2. Support rod; 3. First support block; 4. Second support block; 11. Contact; 12. Support plate; 13. Strip-shaped through hole; 21. Limiting mechanism; 22. Stop cap; 31. Horizontal through hole; 32. Vertical through hole; 33. First slot; 34. Fixing rod; 35. External thread; 36. Nut; 37. Arc-shaped surface; 38. Inclined surface; 41. Second slot. Detailed Implementation

[0010] like Figure 1-6As shown, a pallet mechanism for a crane limiter includes a pallet device, which is mounted on a height limiter and a lifting capacity limiter (the height limiter and lifting capacity limiter are prior art and their structures will not be described in detail here). A vertically arranged support plate 12 is fixed to one side of the contact at the bottom of both devices. Two vertically arranged strip-shaped through holes 13 are opened on the support plate 12. Two parallel and spaced support rods 2 are provided on the pallet device. A limiting mechanism 21 for limiting is fixed to the left end of the support rod 2. The limiting mechanism 21 includes a stop cap 22 fixedly connected to the support rod 2. The diameter of the stop cap 22 is larger than the width of the strip-shaped through holes 13 on the support plate 12. The system also includes a first support block 3 and a second support block 4. Both the first and second support blocks 3 and 4 have transverse through holes 31 corresponding to the two support rods 2. Both the first and second support blocks 3 and 4 also have two vertically arranged through holes 32, located outside the transverse through holes 31. The diameter of the transverse through holes 31 is larger than the diameter of the support rods 2, allowing the support rods 2 to slide through the transverse through holes 31. The top of the first support block 3 has a first slot 33, with both ends communicating with the vertical through holes 32. The bottom of the second support block 4 has a second slot 41, communicating with the two vertical through holes 32. The system also includes two U-shaped fixing rods 34, with a diameter smaller than the diameter of the vertical through holes 32. Both ends of the fixing rods 34 can pass through the vertical through holes 32. Both ends of the fixing rods 34 have external threads 35, allowing the first and second support blocks 3 and 4 to be fixed to the support rods 2 using nuts 36. The left ends of the two support rods 2 can be slidably fitted into the strip-shaped through hole 13. Under the action of the nut 36, the upper end of the fixing rod 34 presses and fixes the two support rods 2 onto the first support block 3 and the second support block 4. When the crane lifting device moves upward under the traction of the wire rope, it touches the second support block 4 and pushes the two support rods 2 to rotate upward counterclockwise. The first support block 3 contacts upward and pushes the contact 11 on the limiter 1 to move upward. The contact 11 moves upward and transmits a signal to the controller to cut off the power supply of the lifting drum and prevent the lifting drum from continuing to pull the lifting device upward through the wire rope.

[0011] Preferably, the upper left side of the first support block 3 is provided with a beveled arc surface 37, which facilitates the first support block 3 to rotate around the contact when the crane lifting device rises and touches the second support block 4.

[0012] Preferably, the lower left side of the first support block 3 is provided with an inclined surface 38, which makes it easy to align the inclined surface 38 with the support plate 12 during installation, thus serving a positioning function.

[0013] Preferably, nut 36 is a wing nut.

[0014] Usage process: In use, the first step is to pass the right ends of the two support rods 2 through the left side of the strip-shaped through hole 13 on the support plate 12. Then, the first support block 3 is passed through the right end of the support rod 2 until the inclined surface of the first support block 3 is in contact with the support plate 12. After adjusting the distance between the stop cap 22 and the support plate 12, the two ends of the fixing rod 34 are passed through the vertical through hole 32 on the first support block 3. Then, the nut 36 is threaded onto the external thread 35 at the end of the fixing rod 34 and the nut 36 is tightened until the first support block 3 and the support rod 2 are fixed together. Then, the second support block 4 is removed, and the transverse through hole 31 on the second support block 4 is passed through the right end of the support rod 2. After adjusting the position of the second support block 4, the second support block 4 is then fixed to the support rod 2 by the fixing rod 34 and nut 36, so that the first support block 3, the second support block 4 and the support rod 2 become a whole. Then, the limiting body 1 of the device is detachably fixed to the frame below the crane lifting mechanism. When the crane spreader moves upward under the traction of the wire rope, it touches the second support block 4 and pushes the two support rods 2 to rotate upward counterclockwise. The first support block 3 contacts upward and pushes the contact 11 on the limiter 1 to move upward. The contact 11 moves upward and transmits a signal to the controller to cut off the power supply to the lifting drum, preventing the lifting drum from continuing to pull the spreader upward by the wire rope.

[0015] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "horizontal", "vertical", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0016] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A pallet mechanism for a crane limiter, comprising a pallet assembly, the pallet assembly including two parallel, spaced-apart support rods, characterized in that: The left end of the support rod is fixed with a limiting mechanism that serves as a limit. It also includes a first support block and a second support block. Both the first and second support blocks have transverse through holes that correspond one-to-one with the two support rods. Both the first and second support blocks have two vertically arranged through holes located outside the transverse through holes. The top of the first support block has a first slot that connects to the vertical through holes at both ends. The bottom of the second support block has a second slot that connects to the two vertical through holes on the second support block. It also includes two U-shaped fixing rods with external threads at both ends. The first and second support blocks are fixed to the support rods with nuts. The left ends of the two support rods can be slidably fitted into the strip-shaped through holes.

2. The pallet mechanism for a crane limiter according to claim 1, characterized in that: The upper left side of the first support block has an arc-shaped surface.

3. The pallet mechanism for a crane limiter according to claim 1, characterized in that: The lower left side of the first support block has an inclined surface.

4. The pallet mechanism for a crane limiter according to claim 1, characterized in that: A wing nut should be selected.

5. A pallet mechanism for a crane limiter according to claim 1, characterized in that: The limiting mechanism includes a stop cap that is fixedly connected to the support rod.

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