CN201990408U - Double-cylinder stay cable boom body telescopic device of large tonnage straight boom lorry mounted crane - Google Patents

Abstract

A large-tonnage straight-arm truck-mounted crane double-cylinder cable arm telescopic device, mainly composed of two telescopic oil cylinders, three sets of cable, basic arm, five-section telescopic boom, rope row and movable pulley, the piston of the first telescopic oil cylinder The rod head is fixed on the basic arm, its cylinder body is fixed on the arm tail of the first telescopic arm, the piston rod head of the second telescopic oil cylinder is fixed on the first telescopic arm, and its cylinder body is fixed on the end of the second telescopic arm. At the end of the arm, there is a rope row between the first telescopic oil cylinder and the second telescopic oil cylinder. There are arm tail pulleys in the second, third, and fourth telescopic arms respectively. The arm head is respectively provided with an arm head pulley, and the arm head pulley is wound with two ends fixed on the stretching cable on the telescopic arm arm head, and the arm tail tops of the fourth and fifth telescopic arms are provided with arm body guide rope blocks. The five-section telescopic arm expands and contracts with the built-in telescopic oil cylinder. The first telescopic arm is extended or retracted first, which can ensure the synchronous expansion and contraction of the rest of the arm body, which can improve the telescopic speed of the arm body and work efficiency.

Description

Large-tonnage straight-arm truck-mounted crane double-cylinder cable arm telescopic device

technical field

The utility model relates to a telescopic device for a straight-arm truck-mounted crane, in particular to a double-cylinder multi-set cable arm body telescopic device for a straight-arm truck-mounted crane with a large tonnage.

Background technique

There are three main telescopic structures of the boom body of the truck-mounted crane: the first type is that several external or built-in telescopic oil cylinders are placed outside or inside the boom body to push the telescopic boom body to move; the second type is a single built-in telescopic oil cylinder and The rope row cable mechanism drives several arms to expand and contract synchronously; the third is to use multi-stage oil cylinders to drive the arms to expand and contract sequentially. The first type is more suitable for folding-arm truck-mounted cranes, but it is not suitable for straight-arm truck-mounted cranes with large tonnage and three-section telescopic boom or more due to the limitations of installation space, arm length and its own weight. The second structure adopts a single built-in telescopic oil cylinder. When the multi-section boom body is stretched, it must rely on more than three sets of rope row and cable mechanisms to drive it. When it is loaded and stretched, the steel wire rope is under severe force. This structure is only applicable to the five-section boom body. The following boom telescopic mechanisms are not suitable for multi-section booms (six-section booms or more than six-section booms) telescopic mechanisms. The third structure adopts the form of multi-stage oil cylinder, firstly, the manufacturing cost is high, and secondly, when the arm body is hoisted, the deflection of the arm body will inevitably be increased, and at the same time, it will cause large deflection deformation of the piston rod of the multi-stage oil cylinder, which is not conducive to the work of the multi-stage oil cylinder , this structure is only suitable for telescopic short boom body below four-section telescopic boom (including three-section boom body).

Contents of the invention

Technical problem: The purpose of this utility model is to overcome the deficiencies in the prior art, and to provide a double-cylinder telescopic cable extension system for a large-tonnage straight-arm truck-mounted crane with compact structure, strong stability, low cost, and good telescopic effect. arm.

Technical solution: The utility model's large-tonnage straight arm truck-mounted crane double-cylinder cable arm telescopic device includes a multi-section telescopic arm, a rope row, and a telescopic oil cylinder. The five-section telescopic arm in the arm has a first telescopic oil cylinder and a second telescopic oil cylinder longitudinally arranged in the five-section telescopic arm. The piston rod head of the first telescopic oil cylinder is fixed on the basic arm through the piston rod pin of the first telescopic oil cylinder. The cylinder body of a telescopic oil cylinder is fixed to the arm tail of the first telescopic arm through the pin shaft of the first telescopic oil cylinder; the piston rod head of the second telescopic oil cylinder is fixed to the arm of the first telescopic arm through the piston rod pin of the second telescopic oil cylinder At the end, the cylinder body of the second telescopic oil cylinder is fixed on the arm tail of the second telescopic arm through the pin shaft of the second telescopic oil cylinder. The tail of the second telescopic oil cylinder is provided with multiple rope pulleys arranged in parallel through the bracket; the first telescopic oil cylinder Between the second telescopic oil cylinder and the second telescopic oil cylinder, there is a rope row composed of multiple steel wire ropes arranged in parallel. One end of the rope row is fixed on the basic arm through the I rope pin, and the other end of the rope row is wound through the rope at the tail of the second telescopic oil cylinder. After the row of pulleys, it is fixed on the end of the third telescopic boom through the II rope pin; the second, third and fourth telescopic booms are respectively equipped with the second, third and fourth telescopic booms. Arm tail pulley, the second, third, and fourth telescopic boom end pulleys are wound with one end respectively fixed on the end of the first telescopic boom, the second telescopic boom end and the third telescopic boom end The third, fourth and fifth telescopic boom retraction cables of the second telescopic boom, the other end of the third telescopic boom retraction cable wound on the second telescopic boom tail pulley is fixed on the third telescopic boom The other end of the retractable cable of the fourth telescopic arm that is wound on the tail pulley of the third telescopic boom is fixed on the end of the fourth telescopic boom, and wound on the tail pulley of the fourth telescopic boom. The other end of the retractable cable of the fifth telescopic arm is fixed on the tail of the fifth telescopic arm; the arm heads of the third and fourth telescopic arms are respectively provided with the third and fourth telescopic arms. Pulley, the pulley of the third section telescopic arm head is wound with two ends fixed on the fourth section telescopic arm arm head on the second section telescopic arm arm head by a screw rod, and the fourth section telescopic arm extension cable bypasses the first section The upper part of the arm tail of the four-section telescopic boom is provided with a guide rope block of the fourth section arm body to make it turn back along the original direction; the pulley of the arm head of the fourth section telescopic arm is wound with two ends and fixed to the arm head of the third section telescopic arm through a screw The fifth joint telescopic arm of the top stretches out the dragline, and the fifth joint telescopic arm stretches out the dragline and walks around the upper part of the arm tail of the fifth joint telescopic arm to be provided with a fifth joint arm body guide rope block that makes it turn back along the original direction.

The tail of the second telescopic oil cylinder is provided with a bracket pulley that is slidably mounted on the bracket through a pin shaft; the number of multiple steel wire ropes in the rope row is the same as the number of the rope row pulleys.

Beneficial effects: due to the adoption of the above-mentioned technical scheme, the entire arm telescopic device adopts two built-in telescopic oil cylinders, a rope row and three sets of cables. The movable pulley system and the double oil cylinders of the truck-mounted crane with three sets of cable arm telescopic devices have changed the operation characteristics of the previous arm body telescopic expansion and contraction only in sequence, so that the five-section telescopic boom expands and contracts with the built-in telescopic oil cylinder, and the first telescopic boom first After being extended or retracted, the second, third, fourth, and fifth booms can be extended and retracted synchronously, thereby greatly increasing the telescopic speed of the boom and improving the efficiency of lifting operations. The utility model has the advantages of compact structure, strong stability, high operation efficiency, good use effect and wide practicability.

Description of drawings

Fig. 1 is the structural diagram of the double-cylinder cable telescopic arm of the large-tonnage straight-arm truck-mounted crane of the present invention.

In the figure: 1-basic boom; 2-first telescopic boom; 3-second telescopic boom; 4-second telescopic boom tail pulley; 5-third telescopic boom; 6-third telescopic boom Arm tail pulley; 7-Rope guide block of the fourth boom body; 8-Telescopic arm tail pulley of the fourth section; 9-Telescopic boom of the fourth section; 10-Rope guide block of the fifth boom body; 11-Fifth section Telescopic arm; 12-retracting cable of the third telescopic arm; 13-retracting cable of the fourth telescopic arm; 14-extending cable of the fourth telescopic arm; 15-arm head pulley of the third telescopic arm; 16-The extension cable of the fifth telescopic arm; 17-The arm head pulley of the fourth telescopic arm; 18-Piston rod pin of the first telescopic cylinder; 19-I rope pin; 20-Pin of the first telescopic cylinder; 21-piston rod pin of the second telescopic oil cylinder; 22-pin shaft of the second telescopic oil cylinder; 23-first telescopic oil cylinder; 24-Ⅱ rope pin; 25-second telescopic oil cylinder; 26-rope row; 27-bracket; 28-rope pulley; 29-support pulley; 30-the retraction cable of the fifth telescopic arm.

Detailed ways

An embodiment of the present utility model is further described below in conjunction with accompanying drawing:

The utility model is a large tonnage straight arm truck-mounted crane double-cylinder cable arm telescopic device, which is mainly composed of a multi-section telescopic boom, a rope row, a movable pulley, and a telescopic oil cylinder. The five-section telescopic arm in 1, the first telescopic oil cylinder 23 and the second telescopic oil cylinder 25 are arranged side by side in the five-section telescopic arm, and the piston rod head of the first telescopic oil cylinder 23 is fixed on the basic arm 1 through the first telescopic oil cylinder shaft 18 , the cylinder body of the first telescopic oil cylinder 23 is fixed on the arm tail of the first section telescopic arm 2 through the pin shaft 20 of the first telescopic oil cylinder; the piston rod head of the second telescopic oil cylinder 25 is fixed on the first section through the second telescopic oil cylinder shaft 21 The arm tail of the telescopic arm 2, the cylinder body of the second telescopic oil cylinder 25 is fixed on the arm tail of the second section telescopic arm 3 through the pin shaft 22 of the second telescopic oil cylinder, and the afterbody of the second telescopic oil cylinder 25 is provided with a parallel arrangement through the support 27. A plurality of rope row pulleys 28; a rope row 26 is arranged between the first telescopic oil cylinder 23 and the second telescopic oil cylinder 25, and one end joint of the rope row 26 is fixed on the arm tail of the basic arm 1 through the rope pin shaft 19, and its wire rope is wound Cross the rope row pulley 28 on the support 27, and the other end joint is fixed on the arm tail of the third section telescopic arm 5 by II rope pin 24; The second, third, and fourth telescopic arms 3, 5, and 9 are respectively provided with the second, third, and fourth telescopic boom tail pulleys 4, 6, and 8. The screw at one end of the retractable cable 12 is fixed on the upper part of the arm head of the first section of the telescopic arm 2, and the other end joint of the wire rope is passed around the small pulley 4 at the end of the second section of the telescopic arm and fixed on the arm tail of the third section of the telescopic arm 5; One end of the retractable cable 13 of the telescopic arm is fixed on the arm head of the second telescopic arm 3, and the other end joint is fixed on the arm tail of the fourth telescopic arm 9 after the wire rope goes around the arm tail pulley 6 of the third telescopic arm; One end of the five-section telescopic boom retraction cable 30 is fixed to the upper part of the arm head of the third telescopic boom 5, the steel wire rope is bypassed and fixed to the tail pulley 8 of the fourth telescopic boom, and the other end joint is fixed to the fifth telescopic boom 11. On the arm tail; the third section, the fourth section telescopic arm head pulley 15,17 are respectively provided with the third section, the fourth section telescopic arm head pulley 15 on the arm head of the fourth section telescopic arm pulley 15, and the third section telescopic arm head pulley 15 is wound with The screw rods at both ends are fixed on the fourth telescopic arm extension cable 14 on the arm head of the second telescopic arm 3. The fourth section arm body rope guide block 7; the fourth section telescopic arm arm head pulley 17 is wound with two ends screw rod and is fixed on the fifth section telescopic arm extension cable 16 on the top of the third section telescopic arm 5 arm head, the fifth section The extension cable 16 of the telescopic arm of the fifth section is bypassed at the upper part of the arm tail of the fifth section telescopic arm 11. The arm head of the telescopic arm 3, the wire rope is turned back along the original direction after the fourth section arm body guide rope block 7 on the upper part of the arm tail of the fourth section telescopic arm 9; The upper part of the arm head of the third joint telescopic arm 5, the wire rope is turned back along the original direction after the fifth joint arm body guide rope block 10 on the upper arm tail of the fifth joint telescopic arm 11.

Working principle and working process:

Arm extension action: because the piston rod head of the first telescopic oil cylinder 23 is fixed on the arm tail of the basic arm 1 through the piston rod pin 18 of the first telescopic oil cylinder, its cylinder barrel is fixed on the arm tail of the first section telescopic arm 2. When the large cavity of a telescopic oil cylinder 23 is supplied with oil, its cylinder barrel is stretched out, and the first section of the telescopic arm 2 stretches out; The arm tail of the arm 2, its cylinder barrel is fixed on the arm tail of the second telescopic arm 3, when oil is supplied to the large chamber of the second telescopic oil cylinder 25, the cylinder barrel stretches out, driving the second telescopic arm 3 to stretch out At the same time, the rope row pulley 28 fixed on the bracket 27 of the second telescopic oil cylinder 25 cylinder tail pushes the rope row 26 to drive the third section telescopic arm 5 to stretch out; then the third section telescopic arm head pulley 15 drives the fourth section The telescopic arm stretches out the stay cable 14 and pulls out the fourth joint telescopic arm 9; then the fourth joint telescopic arm head pulley 17 pulls the fifth joint telescopic arm stretches the stay cable 16, thereby pulling out the fifth joint telescopic arm 11.

Arm retraction action: when the second telescopic cylinder 25 is supplied with oil, the cylinder retracts, and the second telescopic arm 3 retracts; at the same time, the second telescopic arm tail pulley 4 drags the third telescopic arm to retract The drag cable 12 is reclaimed, and the third telescopic arm 5 is pulled back; at this time, the third telescopic boom arm tail pulley 6 drags the fourth telescopic boom retraction cable 13 to pull the fourth telescopic boom 9 back; then The fourth telescopic arm tail pulley 8 drags the fifth telescopic boom retraction cable 30 to pull back the fifth telescopic boom 11; finally, the first telescopic oil cylinder 23 pulls back the first telescopic boom 2.

Claims (3)

1. A telescoping device for a double-cylinder cable arm body of a large-tonnage straight arm truck-mounted crane, including a multi-section telescopic boom, a rope row, and a telescopic oil cylinder, characterized in that: the multi-section telescopic boom includes a basic arm (1), The five-section telescopic arm nested in the basic arm (1), the first telescopic oil cylinder (23) and the second telescopic oil cylinder (25) are longitudinally arranged in the five-section telescopic arm, the piston rod head of the first telescopic oil cylinder (23) The piston rod pin shaft (18) of the first telescopic oil cylinder is fixed on the basic arm (1), and the cylinder body of the first telescopic oil cylinder (23) is fixed on the first telescopic arm (2) through the first telescopic oil cylinder pin shaft (20). ) of the arm tail; the piston rod head of the second telescopic oil cylinder (25) is fixed on the arm tail of the first telescopic arm (2) through the second telescopic oil cylinder piston rod pin (21), and the second telescopic oil cylinder (25) The cylinder body is fixed on the arm tail of the second telescopic arm (3) through the pin shaft (22) of the second telescopic oil cylinder, and the tail of the second telescopic oil cylinder (25) is provided with multiple rope pulleys arranged in parallel through the bracket (27) (28); between the first telescopic oil cylinder (23) and the second telescopic oil cylinder (25), there is a rope row (26) composed of multiple steel wire ropes arranged in parallel, and one end of the rope row (26) passes through the I rope pin shaft (19) Fixed on the basic arm (1), the other end of the rope row (26) goes around the rope pulley (28) at the tail of the second telescopic oil cylinder, and is fixed on the third telescopic section through the II rope pin (24). The arm tail of the arm (5); the second, third, and fourth telescopic arms (3, 5, 9) are respectively provided with the second, third, and fourth telescopic arm tail pulleys (4 , 6, 8), the second, third, and fourth telescopic arm tail pulleys (4, 6, 8) are wound with one end respectively fixed on the The third, fourth and fifth telescopic boom retraction cables (12, 13, 30) at the end of the telescopic arm (3) and the end of the third telescopic boom (5) are wound on the second telescopic The other end of the retraction cable (12) of the third telescopic boom on the boom tail pulley (4) is fixed on the boom tail of the third telescopic boom (5), and is wound around the third telescopic boom tail pulley (6 ) and the other end of the retraction cable (13) of the fourth telescopic arm is fixed on the tail of the fourth telescopic boom (9), and the fifth telescopic The other end of the arm retracting cable (30) is fixed on the arm tail of the fifth section telescopic arm (11); The fourth section telescopic arm head pulley (15, 17), the third section telescopic arm arm head pulley (15) is wound with two ends fixed on the second section telescopic arm (3) arm head on the fourth section telescopic The arm stretches out the cable (14), and the fourth section of the telescopic arm extends the cable (14) to go around the upper part of the arm tail of the fourth section of the telescopic arm (9). The rope block (7); the pulley (17) of the fourth section of the telescopic arm head (17) is wound with two ends that are fixed to the upper part of the third section of the telescopic arm (5) by a screw rod to extend the extension cable (16) of the fifth section of the telescopic arm (5) , the fifth section of the telescopic arm stretches out the cable (16) to bypass the fifth section of the telescopic arm (11) The upper part of the arm tail is provided with a fifth section arm body guide rope block (10) that makes it turn back along the original direction. 2. The large-tonnage straight-arm truck-mounted crane double-cylinder cable arm telescopic device according to claim 1, characterized in that: the tail of the second telescopic oil cylinder (25) is provided with a distribution shaft slidingly mounted on the bracket ( 27) on the bracket pulley (29). 3. The telescoping device for the double-cylinder cable arm body of the large-tonnage straight arm truck-mounted crane according to claim 1, characterized in that: the number of steel wire ropes in the rope row (26) is the same as the number of rope row pulleys (28 ) are the same number.