Folding arm crane with brake device

Abstract

The utility model discloses a folding arm crane with a brake device. The folding arm crane comprises a stand column, a first support arm pivoted on the stand column, a second support arm hinged with the first support arm, and a hook connected with a rope. A large gear is fixed to the top of the stand column, a braking device is arranged on the first supporting arm, and the braking device comprises an electromagnet fixed to the first supporting arm, a lifting type braking block located below the electromagnet, a fixed braking block capable of abutting against the lifting type braking block, a gear shaft fixedly connected with the fixed braking block and a small gear installed on the gear shaft. The bull and pinion are meshed. When the product needs to be stopped, the electromagnet is powered on, the lifting type brake block abuts against the fixed brake block, the fixed brake block is braked, then the gear shaft and the small gear are braked, and the large gear is clamped by the small gear. Thus, relative rotation between the first support arm and the stand column is braked to assist workers in braking the product, and the product can be accurately stopped above the preset station.

Description

Technical Field

[0001] The utility model relates to production auxiliary equipment, in particular to product handling auxiliary mechanical equipment. Background Art

[0002] Light and small lifting equipment is generally driven by manpower, that is, the handle of the manually driven equipment rotates the arm of the crane in the horizontal direction to move items to another place. For example, the patent document with authorization announcement number CN212503697U discloses a folding arm crane, which includes a column, a first arm, and a second arm. The bottom end of the column is used to be fixed to the ground, the first arm is vertically arranged with the column, and the first end of the first arm is pivoted or hinged with the top end of the column so that the first arm can rotate in the horizontal direction. The first end of the second arm is pivoted or hinged with the second end of the first arm so that the second arm can rotate in the horizontal direction. The end of the pulling rope is fixed with a lifting hook vertically arranged below the second end of the second arm.

[0003] The horizontal rotation of the first arm relative to the column relies on the worker to apply a push or pull force to the product on the lifting hook. After the first arm rotates relative to the column, it is difficult for the worker to stop the first arm, the second arm and the product from rotating due to their large mass and inertia, and the product is difficult to stop accurately at the predetermined position. Utility Model Content

[0004] The technical problem solved by the utility model is that the horizontal rotation of the first supporting arm relative to the column is driven by manpower. After the rotation, due to the inertia, it is difficult for workers to stop it and the product is difficult to stop accurately at the predetermined position.

[0005] To solve the above technical problems, the utility model provides the following technical solutions: a folding arm crane provided with a braking device, comprising a column fixed on the ground, a first arm pivotally connected to the column, a second arm hinged to the first arm, and a hook connected to a rope, a first pulley is provided at one end of the second arm, the rope is connected to a rope winder through the first pulley, the rope winder is installed on the first arm, a large gear is fixed on the top of the column, a braking device is provided on the first arm, the braking device comprises an electromagnet fixed on the first arm, a lifting brake block located below the electromagnet, a fixed brake block capable of counteracting the lifting brake block, a gear shaft fixedly connected to the fixed brake block, and a small gear installed on the gear shaft, the large gear is meshed with the small gear, the electromagnetic force of the electromagnet can drive the lifting brake block to rise, and the rising lifting brake block counteracts the fixed brake block.

[0006] The rope winder is equivalent to a winch. The hook hooks the product, the rope winder starts to work, winds the rope, and the rope pulls the hook up to lift the product. The worker pushes or pulls the product to make the first arm rotate horizontally relative to the column, or the second arm rotates horizontally relative to the first arm. When the product reaches the top of the predetermined workstation, the rope winder releases the rope, and the product descends and lands on the predetermined workstation.

[0007] When it is necessary to stop the product from moving horizontally in the air, the brake device is activated, the electromagnet is energized, and magnetic force is generated. The magnetic force attracts the lifting brake block, and the lifting brake block rises and counteracts the fixed brake block. There is friction resistance between the lifting brake block and the fixed brake block. The lifting brake block brakes the fixed brake block, and then the gear shaft and the small gear are braked, and the large gear is stuck by the small gear. In this way, the relative rotation between the first arm and the column is braked to assist the worker in braking the product, which is conducive to the product accurately stopping above the predetermined position.

[0008] After the electromagnet loses power, the lifting brake block descends under the action of gravity and loses contact with the fixed brake block. The first arm rotates relative to the column, and the small gear rotates around the large gear.

[0009] The control switches of the rope winder and the electromagnet are integrated on a controller. The controller is connected to the rope winder and the electromagnet through a cable. The cable can pass around the free end of the second arm to make the controller droop. The worker can push or pull the product while holding the controller.

[0010] A pivot shaft is provided at the top of the column, a pivot sleeve is provided at one end of the first arm, the pivot sleeve cooperates with the pivot shaft, a downwardly extending rotation auxiliary arm is welded to the first arm, a follower wheel is provided on the rotation auxiliary arm, and the follower wheel abuts against the side wall of the column. The two follower wheels are mounted on an arc-shaped follower wheel bracket, and the follower wheel bracket is mounted on the rotation auxiliary arm. When the first arm rotates relative to the column, the two follower wheels rotate around the side wall of the column, playing an auxiliary supporting role for the first arm. A strengthening inclined rod is provided between the first arm and the rotation auxiliary arm.

[0011] The center line of the large gear coincides with the axis line of the pivot shaft, and the large gear is located below the pivot sleeve; a mounting hole is provided on the first arm, and the mounting hole extends downward to the rotating auxiliary arm, and a clearance gap is provided on the side wall of the rotating auxiliary arm, and the lifting brake block, the fixed brake block, the gear shaft, and the small gear are located in the mounting hole, and the large gear is meshed with the small gear through the clearance gap.

[0012] A linear bearing or a guide sleeve is provided between the lifting brake block and the mounting hole, a ball bearing is provided between the gear shaft and the mounting hole, a snap ring groove is provided on the side wall of the mounting hole, an open snap ring is provided in the snap ring groove, and the open snap ring limits the ball bearing axially to avoid axial movement of the ball bearing, thereby avoiding axial movement of the gear shaft.

[0013] The bottom of the lifting brake block is provided with a slot with a convex cross section, and the fixed brake block fits in the slot, and there is an upper and lower gap between the slot and the fixed brake block. A limit ring is fixed on the lifting brake block, and when the electromagnet loses power, the lifting brake block descends, and the limit ring abuts against the linear bearing or guide sleeve. At this time, the lifting brake block has no contact with the fixed brake block, and the disc-shaped fixed brake block can rotate in the slot. When the electromagnet is energized, the lifting brake block rises, and the bottom surface of the slot contacts the bottom surface of the fixed brake block, braking the fixed brake block, and then braking the gear shaft and the pinion.

[0014] The rope winder is installed on the pivot sleeve, and the rope winder moves synchronously with the first supporting arm.

[0015] A telescopic spring is sleeved on the rope, the lower end of the telescopic spring is connected to the top of the hook, and the top of the telescopic spring is connected to the free end of the second arm. The rope winder releases the rope, the hook descends, the telescopic spring is stretched, and elastic potential energy is accumulated. When the tension of the telescopic spring on the hook is equal to the gravity on the hook, the hook stops descending and the rope bends in the spring. When the worker hooks the product, he pulls down the hook. After the product is hooked, the telescopic spring can pull the hook up, so that the hook can maintain the state of hooking the product. After that, the rope winder winds the rope and the hook pulls the product up. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings:

[0017] Figure 1 It is a schematic diagram of a knuckle boom crane provided with a braking device;

[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 for Figure 2 A schematic diagram of a middle lift brake block 52;

[0020] Figure 4 for Figure 3 A top view of

[0021] Figure 5 for Figure 3 Bottom view of

[0022] Figure 6 This is a schematic diagram obtained by looking down at the folding arm crane;

[0023] Figure 7 for Figure 6 A schematic diagram of the second arm 30 after rotating relative to the first arm 20;

[0024] Figure 8 for Figure 1 Left view of .

[0025] Explanation of symbols in the figure:

[0026] 10. upright column; 11. pivot axis;

[0027] 20. first arm; 21. pivot sleeve; 22. rotation auxiliary arm; 221. clearance gap; 23. follower wheel; 24. follower wheel bracket; 26. oblique rod;

[0028] 30. a second arm; 31. a pair of second pulleys mounted on the second arm, the rope passing through a gap between the pair of second pulleys;

[0029] 40. hook; 41. rope; 42. first pulley; 43. rope winder; 44. telescopic spring;

[0030] 50. Large gear; 51. Electromagnet; 52. Lifting brake block; 521. Slot; 522. Limit ring; 53. Fixed brake block; 54. Gear shaft; 55. Pinion; 56. Linear bearing; 57. Ball bearing; 58. Open retaining ring. DETAILED DESCRIPTION

[0031] Combination Figure 1 , Figure 2 A folding arm crane provided with a braking device comprises a column 10 fixed on the ground, a first arm 20 pivotally connected to the column, a second arm 30 hinged to the first arm, and a hook 40 connected to a rope 41, a first pulley 42 is provided at one end of the second arm, the rope is connected to a rope winder 43 through the first pulley, the rope winder is installed on the first arm, a large gear 50 is fixed on the top of the column 10, and a braking device is provided on the first arm, the braking device comprises an electromagnet 51 fixed on the first arm, a lifting brake block 52 located below the electromagnet, a fixed brake block 53 capable of counteracting the lifting brake block, a gear shaft 54 ​​fixedly connected to the fixed brake block, and a small gear 55 installed on the gear shaft, the large gear meshes with the small gear, and the electromagnetic force of the electromagnet can drive the lifting brake block to rise, and the rising lifting brake block counteracts the fixed brake block.

[0032] The hook 40 hooks the product, and the rope winder 43 starts to work, winds the rope 41, and the rope pulls the hook 40 up to lift the product. The worker pushes or pulls the product, so that the first arm 20 rotates horizontally relative to the column 10, or the second arm 30 rotates horizontally relative to the first arm 20. When the product reaches the top of the predetermined workstation, the rope winder 43 releases the rope 41, and the product descends and lands on the predetermined workstation.

[0033] When it is necessary to stop the product from moving horizontally in the air, the brake device is activated, the electromagnet 51 is energized, and a magnetic force is generated. The magnetic force attracts the lifting brake block 52, and the lifting brake block rises and contacts the fixed brake block 53. There is friction resistance between the lifting brake block 52 and the fixed brake block 53, and the lifting brake block brakes the fixed brake block, and then the gear shaft 54 ​​and the small gear 55 are braked, and the large gear 50 is stuck by the small gear. In this way, the relative rotation between the first arm 20 and the column 10 is braked to assist the worker in braking the product, so that the product can be accurately stopped above the predetermined position.

[0034] After the electromagnet 51 loses power, under the action of gravity, the lifting brake block 52 descends and breaks away from the fixed brake block 53. The first arm 20 rotates relative to the column 10, and the small gear 55 rotates around the large gear 50 idly.

[0035] The control switches of the rope winder 43 and the electromagnet 51 are integrated on a controller. The controller is connected to the rope winder 43 and the electromagnet 51 through a cable. The cable can pass around the free end of the second arm 30 to make the controller droop. The worker can push or pull the product while holding the controller.

[0036] A pivot shaft 11 is provided at the top of the column 10, and a pivot sleeve 21 is provided at one end of the first arm 20, and the pivot sleeve cooperates with the pivot shaft. A rotation auxiliary arm 22 extending downward is welded to the first arm 20, and a follower wheel 23 is provided on the rotation auxiliary arm, and the follower wheel abuts against the side wall of the column. The two follower wheels 23 are installed on an arc-shaped follower wheel bracket 24, and the follower wheel bracket is installed on the rotation auxiliary arm 22. When the first arm 20 rotates relative to the column, the two follower wheels 23 rotate around the side wall of the column 10, playing the role of auxiliary support for the first arm. A reinforcement inclined rod 26 is provided between the first arm 20 and the rotation auxiliary arm 22.

[0037] The center line of the large gear 50 coincides with the axis line of the pivot shaft 11, and the large gear is located below the pivot sleeve 21; a mounting hole is provided on the first arm 20, and the mounting hole extends downward to the rotating auxiliary arm 22, and a clearance gap 221 is provided on the side wall of the rotating auxiliary arm. The lifting brake block 52, the fixed brake block 53, the gear shaft 54, and the small gear 55 are located in the mounting hole, and the large gear is meshed with the small gear 55 through the clearance gap.

[0038] like Figure 2 A linear bearing 56 or a guide sleeve is provided between the lifting brake block 52 and the mounting hole, a ball bearing 57 is provided between the gear shaft 54 ​​and the mounting hole, a snap ring groove is provided on the side wall of the mounting hole, an open snap ring 58 is fitted in the snap ring groove, and the open snap ring limits the axial position of the ball bearing to prevent the axial movement of the ball bearing 57, thereby preventing the axial movement of the gear shaft 54.

[0039] refer to Figures 3 to 5 The bottom of the lifting brake block 52 is provided with a groove 521 with a convex cross-section, and the fixed brake block 53 is fitted in the groove, and there is an upper and lower gap between the groove and the fixed brake block. A limit ring 522 is fixed on the lifting brake block 52, and the electromagnet 51 loses power, the lifting brake block 52 descends, and the limit ring 522 abuts against the linear bearing 56 or the guide sleeve. At this time, the lifting brake block 52 has no contact with the fixed brake block 53, and the disc-shaped fixed brake block 53 can rotate in the groove 521. When the electromagnet 51 is energized, the lifting brake block 52 rises, and the bottom surface of the groove contacts the bottom surface of the fixed brake block 53, braking the fixed brake block, and then braking the gear shaft 54 ​​and the pinion 55.

[0040] like Figure 2 The rope winding machine 43 is installed on the pivot sleeve 21, a mounting seat is welded on the pivot sleeve 21, and the rope winding machine 43 is installed on the mounting seat.

[0041] like Figure 1 , a telescopic spring 44 is sleeved on the rope 41, the lower end of the telescopic spring is connected to the top of the hook 40, and the top of the telescopic spring is connected to the free end of the second arm 30. The rope winding machine 43 releases the rope 41, the hook 40 descends, the telescopic spring 44 is stretched, and the elastic potential energy is accumulated. When the tension of the telescopic spring on the hook 40 is equal to the gravity of the hook, the hook 40 stops descending, and the rope 41 bends in the telescopic spring 44. When the worker hooks the product, he pulls down the hook 40. After the product is hooked, the telescopic spring 44 can pull the hook 40 up, so that the state of the hook hooking the product can be maintained. After that, the rope winding machine 43 winds the rope 41, and the hook 40 pulls the product up.

[0042] The above contents are only preferred implementation modes of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation mode and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. A folding arm crane with a braking device, comprising a column (10) fixed on the ground, a first arm (20) pivotally connected to the column, a second arm (30) hinged to the first arm, and a hook (40) connected to a rope (41), a first pulley (42) being provided at one end of the second arm, the rope being connected to a rope winder (43) via the first pulley, the rope winder being installed on the first arm, characterized in that: A large gear (50) is fixed on the top of the column (10), and a braking device is provided on the first arm. The braking device comprises an electromagnet (51) fixed on the first arm, a lifting brake block (52) located below the electromagnet, a fixed brake block (53) capable of abutting against the lifting brake block, a gear shaft (54) fixedly connected to the fixed brake block, and a small gear (55) installed on the gear shaft. The large gear is meshed with the small gear, and the electromagnetic force of the electromagnet can drive the lifting brake block to rise, and the rising lifting brake block abuts against the fixed brake block.

2. The folding arm crane with a braking device according to claim 1, characterized in that: A pivot shaft (11) is provided at the top of the column (10), a pivot sleeve (21) is provided at one end of the first arm (20), the pivot sleeve cooperates with the pivot shaft, a rotating auxiliary arm (22) extending downward is welded to the first arm (20), a follower wheel (23) is provided on the rotating auxiliary arm, and the follower wheel abuts against the side wall of the column.

3. The folding arm crane with a braking device as claimed in claim 2, characterized in that: The center line of the large gear (50) coincides with the axis line of the pivot shaft (11), and the large gear is located below the pivot sleeve (21); a mounting hole is provided on the first support arm (20), and the mounting hole extends downward to the rotation auxiliary arm (22); a clearance notch (221) is provided on the side wall of the rotation auxiliary arm; a lifting brake block (52), a fixed brake block (53), a gear shaft (54), and a small gear (55) are located in the mounting hole, and the large gear is meshed with the small gear (55) through the clearance notch.

4. The folding arm crane with a braking device as claimed in claim 3, characterized in that: A linear bearing (56) or a guide sleeve is provided between the lifting brake block (52) and the mounting hole, a ball bearing (57) is provided between the gear shaft (54) and the mounting hole, a snap ring groove is provided on the side wall of the mounting hole, an open snap ring (58) is matched in the snap ring groove, and the open snap ring limits the axial position of the ball bearing.

5. The folding arm crane with a braking device as claimed in claim 3, characterized in that: The bottom of the lifting brake block (52) is provided with a clamping groove (521) with a convex cross-section, and the fixed brake block (53) is fitted in the clamping groove, and there is an upper and lower gap between the clamping groove and the fixed brake block.

6. The folding arm crane with a braking device as claimed in claim 2, characterized in that: The rope winding machine (43) is installed on the pivot sleeve (21).

7. The folding arm crane with a braking device according to claim 1, characterized in that: A telescopic spring (44) is sleeved on the rope (41), the lower end of the telescopic spring is connected to the top of the hook (40), and the top end of the telescopic spring is connected to the free end of the second support arm (30).

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