CN104088965A - Linear telescopic device - Google Patents

Abstract

The invention discloses a linear telescopic device, which comprises a telescopic chain, a steel wire rope, a worm-type chain storage box and a driving mechanism, etc., the worm-type chain storage box has a groove extending along a helical line; the telescopic chain can One-way bending, after one-way bending, it is wrapped in the channel of the volute chain storage box, the head end is located outside the worm type chain storage box, and the head end can be stretched in a straight line; the steel wire rope It is located on the back side of the telescopic chain in one-way bending direction, and its end is fixed on the head end, which can expand and contract synchronously with the head end, so that the protruding part of the telescopic chain is stretched into a straight line; the driving mechanism is respectively connected to The expansion chain and the steel wire rope drive the expansion and contraction of the expansion chain and the steel wire rope, and the expansion and contraction linear speeds of the expansion chain and the steel wire rope are the same. The invention solves the difficult problem of realizing long-distance transmission in a limited constrained space, and improves the ratio of the extended length to the retracted overall length.

Description

A linear telescopic device

technical field

The invention relates to the field of telescopic devices, in particular to a linear telescopic device with a small footprint and a long extension length. the

Background technique

Linear telescopic devices are widely used in lifting and aerial work machinery and automatic production lines to transport objects or people from one position to another, and the distance between the two positions is relatively long, which can be transported horizontally and vertically. the

Linear telescopic devices are widely used in hoisting machinery, and the telescopic devices of cranes include boom telescopic mechanisms and outrigger support mechanisms. The function of the boom telescopic mechanism is to change the length of the boom to obtain the required range and lifting height to meet the operation requirements. The telescoping mechanism of the boom adopts the mother-in-command type boom, which generally has three or more booms. There are basically three movement modes for the telescoping of each boom: sequential telescopic, synchronous telescopic and independent telescopic. There are three driving modes of the telescopic mechanism of the boom: mechanical, hydraulic and composite. The mechanical driving device has a simple structure and is mainly driven by a wire rope and a reel; And discharge to open to control the extension length and speed of the telescopic mechanism, and the lifting weight is relatively large. the

Linear telescopic devices are also widely used in aerial lifts to complete aerial work and maintenance tasks. Aerial lifts are mainly divided into scissor lifts and single-mast lifts. The telescopic mechanism of the scissor lift is mainly composed of X frames. The number of X frames and the length of the rods are increased through the holes to change the height of the lift. The X frame telescopic mechanism mainly uses Hydraulic drive, set a certain number of hydraulic cylinders according to the lifting height, the number of X frames and the load. The telescopic mechanism of the single-mast lift is mainly composed of wire ropes, pulleys and flat plates. The head and tail of each flat plate are connected to the two adjacent platforms through steel wire ropes and pulleys. The relative speed between the flat plates is equal. The height of the lift is determined by the number of flat plates and the The length of the single-mast lift is determined by the motor drive, and the motor drives the reel, and the speed of the lift is controlled by controlling the speed of the coiled wire rope of the reel. The carrying capacity of the single-mast lift is smaller than that of the scissor lift, and the two choose the appropriate lift according to different occasions. the

In order to provide a higher load capacity, the design of the telescopic part of the above-mentioned linear telescopic device is relatively thick, resulting in a large volume of the base part of the telescopic mechanism, and the ratio of the telescopic length to the overall length after retraction is small, which cannot fit within the effective space. Realize long-distance expansion and contraction. In an automated production line, the space is generally narrow and the telescopic length is relatively large. The above-mentioned telescopic devices occupy a large volume. On the basis of ensuring the extension length, how to compress the volume of the telescopic device to be suitable for a limited restricted space, It is a technical problem to be solved urgently for the linear expansion device. the

Based on this, the present invention provides a novel linear expansion device. the

Contents of the invention

The purpose of the present invention is to provide a linear telescopic device to solve the problem of long-distance transmission in a limited restricted space, and to increase the ratio of the extended length to the retracted overall length. the

Based on the above-mentioned purpose, the present invention provides a linear expansion device, which includes an expansion chain, a steel wire rope, a volute chain storage box and a drive mechanism, wherein:

There is a channel extending along the helix in the volute chain storage box;

The telescopic chain can be bent in one direction, and after it is bent in one direction, it is wrapped in the channel of the worm-type chain storage box, and the head end of the telescopic chain is located outside the worm-type chain storage box, and the head end Able to expand and contract in a straight line;

The steel wire rope is located on the back side of the one-way bending direction of the telescopic chain, one end of which is wound on the reel, and the other end is fixed to the head end of the telescopic chain, and the wire rope can follow the head end of the telescopic chain Synchronous expansion and contraction, after the head end is stretched out, the expansion rope will tighten the extended part of the expansion chain to form a straight line;

The driving mechanism is respectively connected to the telescopic chain and the steel wire rope to drive the expansion and contraction of the telescopic chain and the steel wire rope, and the telescopic chain and the steel wire rope have the same linear velocity. the

Optionally, the helix of the channel is set to be an Archimedes helix. the

Optionally, the outlet of the channel is connected with a support mouth, and the inner cavity of the support mouth communicates with the channel, and the inner cavity extends along the direction in which the telescopic chain protrudes in a straight line, and is used for supporting the The expansion and contraction of the above-mentioned expansion chain is guided. the

Optionally, the other end of the steel wire rope is fixed to the head end of the telescopic chain after passing through the box body of the volute chain storage box and extending along the inner cavity. the

Optionally, the telescopic chain has several chain links, and the chain links have a rectangular structure, and the rectangular structure includes a bottom surface, a top surface opposite to the bottom surface, and two end surfaces located in the length direction of the telescopic chain; wherein:

The two ends of the bottom surface of the adjacent chain links are hinged by a pin shaft, and the axial direction of the pin shaft is perpendicular to the length direction of the telescopic chain, so that the telescopic chain can be bent toward the bottom surface ;

Adjacent end surfaces of adjacent chain links can be fitted together to prevent the telescopic chain from bending toward the top surface. the

Optionally, the back of the chain link has a bar-shaped groove, and the extending direction of the groove is the length direction of the telescopic chain, for accommodating the steel wire rope. the

Optionally, the back of the chain link has two grooves, and the two grooves are parallel; correspondingly, there are two steel wire ropes, and the two steel wire ropes are parallel. the

Optionally, the drive mechanism includes a motor, a pulley set and a sprocket, the motor drives the sprocket and the pulley set to run synchronously, the sprocket drives the expansion and contraction of the telescopic chain, and the belt The wheel set drives the drum to run. the

Optionally, a roller is installed on the pin shaft, and the roller is meshed with the sprocket. the

Optionally, the motor, the sprocket and the reel are respectively installed on the case of the worm type chain storage box, the driving pulley of the pulley set is coaxially installed with the sprocket and synchronous operation, the driven pulley of the pulley set is installed coaxially with the reel and operates synchronously. the

To sum up, the linear telescopic device provided by the present invention uses a special chain with one-way bending characteristics to cooperate with the volute chain storage box to realize the telescopic action. The spiral channel in the volute chain storage box is used to accommodate For the retracted chain, compared with the traditional mother-in-law, scissor-type or single-mast type telescopic devices, the base of the present invention has a small volume and is more suitable for limited restricted spaces. The invention adopts the steel wire rope to apply force from the back side of the special chain in the bending direction to realize the control of one-way bending without relying on the gravity of the chain, so the chain can be extended straight in any direction. the

Description of drawings

Fig. 1 is the axis side view of linear expansion device of the present invention;

Fig. 2 is the schematic diagram of the fully extended state of the linear expansion device of the present invention;

Fig. 3 is the schematic diagram of retracting state of linear expansion device of the present invention;

Fig. 4 is the axonometric view of expansion chain of the present invention;

Figure 5 is an isometric view of the drive mechanism of the present invention. the

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings. the

Referring to Figures 1-3, it is a specific embodiment of the present invention. the

This embodiment provides a linear expansion device, which includes an expansion chain 20 , a steel wire rope 9 , a volute chain storage box 7 and a driving mechanism 30 . The telescopic action is realized by the cooperation of the telescopic chain 20 and the worm-type chain storage box 7, and on this basis, the telescopic device has the characteristics of small size, and is more suitable for workplaces with small constraints, such as automatic production lines And in the robot industry; the traction force of the steel wire rope 9 is used to control the linear expansion and contraction of the steel wire rope 9, and the linear expansion and contraction can be maintained without relying on the gravity of the expansion chain 20, so that the expansion device can be linearly expanded and contracted in any direction, which improves its scope of application. in particular,

The volute type chain storage box 7 has a channel extending along the helix, and the use of the helix can ensure that the telescopic chain 20 slides smoothly along the channel. In an optional solution of this embodiment, the helix of the channel is set as an Archimedes helix, which can store the telescopic chain 20 of the maximum length in a limited space. the

The telescoping chain 20 can be bent in one direction, and is wrapped in the channel of the volute chain storage box 7 after being bent in one direction. The head end 2 of the telescopic chain 20 is located outside the worm type chain storage box 7, and the head end 2 can expand and contract along a straight line; the end of the telescopic chain 20 is located in the channel of the worm type chain storage box 7 , the end slides reciprocally in the channel as the head end 2 expands and contracts. the

The steel wire rope 9 is located on the back side of the one-way bending direction of the telescopic chain 20, one end of which is wound on the reel 10, and the other end is fixed to the head end 2 of the telescopic chain 20, and the steel wire rope 9 can be The head end 2 of the telescopic chain 20 expands and contracts synchronously. After the head end 2 stretches out, the telescopic rope tightens the protruding part of the telescopic chain 20 to form a straight line. Specific operation: refer to Fig. 2, when the head end 2 of the telescopic chain 20 is stretched out, the steel wire rope 9 will tighten the protruding part of the telescopic chain 20, and the telescopic chain 20 will lose its unidirectional flexibility, that is, the telescopic chain 20 will Each chain link 4 remains rigidly connected, and the telescopic chain 20 can maintain a straight line and rigidly protrude; referring to FIG. 3 , when the drive mechanism 30 drives the sprocket 6 and the wire rope 9 to retract, the wire rope 9 is wound back on the reel 10, and the wire rope is released. The telescopic chain 20 of 9 has unidirectional bending performance again, and coils and stores along the helical channel of the chain storage box in the bending direction. the

The drive mechanism 30 is respectively connected to the telescopic chain 20 and the steel wire rope 9 to drive the expansion and contraction of the telescopic chain 20 and the steel wire rope 9, and the telescopic linear speed of the telescopic chain 20 and the steel wire rope 9 is the same, To ensure that the wire rope 9 can always tighten the head end 2 of the telescopic chain 20 during the stretching process. the

Referring to Fig. 1 and Fig. 3, in an optional solution of this embodiment, the outlet of the channel is connected with a supporting nozzle 8, the inner cavity of the supporting nozzle 8 communicates with the channel, and the inner cavity Extending along the direction in which the telescopic chain 20 extends straight, it is used to guide the expansion and contraction of the telescopic chain 20 and further ensure that the protruding part of the telescopic chain 20 is in a straight line state. In this solution, the other end of the steel wire rope 9 passes through the box body of the volute chain storage box 7 and extends along the inner cavity, and then is fixed to the head end 2 of the telescopic chain 20, that is, the The worm-type chain storage box 7 is located between the reel 10 and the head end 2 of the telescopic chain 20. The arrangement of the space structure further ensures that the steel wire rope 9 always provides tension to the head end 2 of the telescopic chain 20. Force, to adapt to the linear expansion and contraction of any direction of the expansion chain 20. the

Referring to Fig. 1, Fig. 3 and Fig. 4, in another optional solution of this embodiment, in order to realize that the telescopic chain 20 has a unidirectional bending characteristic, the telescopic chain 20 can be set as: the telescopic chain 20 It includes several rollers 3 and several chain links 4 of the same type. When the telescopic chain 20 is coiled in the channel one by one, the chain links 4 of the telescopic chain 20 cannot Continue to move, so the quantity of chain link 4 must match with the track of volute type chain storage case 7. The chain link 4 is a rectangular structure, and the rectangular structure includes a bottom surface, a top surface opposite to the bottom surface, and two end surfaces located in the length direction of the telescopic chain 20 . The two ends of the bottom surface adjacent to the chain link 4 are hinged by a pin shaft 12, and the axial direction of the pin shaft 12 is perpendicular to the length direction of the telescopic chain 20, for realizing that the telescopic chain 20 can Bending toward the bottom surface; the adjacent end surfaces of the adjacent chain links 4 can fit together, that is, they are against each other, and the direction of the force against each other is shown in the direction of the shear head in Figure 4, which hinders the retractable chain 20 from reversing The bending is used to prevent the telescopic chain 20 from bending toward the top surface, for example, the end surfaces are respectively perpendicular to the corresponding top surfaces. Accordingly, the bottom surface can be bent toward the bottom surface under the hinge action of the pin shaft 12 on the bottom surface, and can not be bent toward the top surface under the limit action of the end surface, so that the telescopic chain 20 has the characteristic of one-way bending. During concrete design installation, also comprise washer 121, two adjacent chain links 4 are all hinged with bearing pin 12, and bearing pin 12 and washer 121 are riveted together, thus constitute telescoping chain 20. The roller 3 is sleeved on the pin shaft 12, so that there is rolling friction between the telescopic chain and the channel. the

Preferably in this embodiment, the back side of the chain link 4 has a bar-shaped groove, and the extension direction of the groove is the length direction of the telescopic chain 20, which is used to accommodate the steel wire rope 9, and the structure is compact. degree, and realize that steel wire rope 9 and telescopic chain 20 keep in sync when moving. As shown in the figure, the back of the chain link 4 has two grooves, and the two grooves are parallel; correspondingly, two steel wire ropes 9 are provided, and the two steel wire ropes 9 are parallel . The design of double wire ropes 9 and double grooves effectively improves the stability of the wire ropes 9 when they are tensioned, thereby improving the working accuracy of the telescopic device of the present invention. the

In this preferred solution, the support mouth 8 is further used for: during the extension process, when the steel wire rope 9 and the telescopic chain 20 pass through the inner cavity of the support mouth 8, the inner cavity will hold the steel wire rope 9 Press fit in the groove on the back side of the chain link 4; The groove on the back of the chain link 4. the

Referring to Fig. 1, Fig. 3 and Fig. 5, in another optional solution of this embodiment, in order to realize the equal linear velocity drive of the telescopic chain 20 and the wire rope 9 by the drive mechanism 30 on the basis of a compact structure, the Said drive mechanism 30 can be set as, for example, it comprises motor 5, pulley set and sprocket 6, and said motor 5 drives said sprocket 6 and said pulley set to run synchronously, and said sprocket 6 drives said stretching When the chain 20 expands and contracts, the pulley set drives the drum to run. the

Preferably in this solution, a roller 3 is installed on the pin shaft 12 , and the roller 3 meshes with the sprocket 6 . The motor 5, the sprocket 6 and the reel 10 are respectively installed on the casing of the worm type chain storage box 7 through the mounting base 11, and the driving pulley 13 of the pulley set is connected with the chain Wheel 6 is coaxially installed and runs synchronously to ensure that both have better speed matching. Driving pulley 16 is coaxially installed with described reel 10 and runs synchronously, and described driven pulley 16 and described reel are installed on the reel shaft 15 as shown in Figure 5; Power is transmitted between the wheels 16 through the synchronous belt 14, and the transmission ratio of the two synchronous pulleys is designed according to the diameter ratio of the sprocket 6 and the reel 10, so as to ensure that the wire rope 9 and the telescopic chain 20 have the same linear speed. The forward and reverse rotation of the motor 5 drives the sprocket 6 and the reel 10 to rotate clockwise and counterclockwise, thereby driving the telescopic chain 20 and the wire rope 9 to expand and contract. the

The linear telescopic device of the present invention can push and hold objects from a long distance. During specific operations, the gripper 1 is installed at the head end 2 of the telescopic chain 20 for grabbing objects. the

In the linear telescopic device of this embodiment, when stretching out in a straight line, the sprocket 6 pulls out the telescopic chain 20 from the worm-type chain storage box 7, and the wire rope 9 and the telescopic chain 20 are synchronously stretched out, and each of the chains is tightened. The chain links 4 are specially made, and each chain link 4 remains rigidly connected under the tension force, so the telescopic chain 20 can keep stretching out in a straight line. When the telescopic chain 20 is retracted, the sprocket 6 and the reel 10 rotate counterclockwise at the same time, the steel wire rope 9 and the telescopic chain 20 are retracted synchronously, the steel wire rope 9 is gradually disengaged from the special chain links 4, and the chain links 4 are separated by rigid connections into discrete The single chain link 4 can play the one-way bending characteristic, and the telescopic chain 20 can be inserted into the chain storage box. the

Compared with the prior art, the beneficial effects of the present invention are at least:

1. The extension length of the snail-type linear expansion device is controllable and has high safety. The ratio of the extension length to the initial length is larger than that of the traditional expansion device. the

2. After the telescopic chain 20 stretches out, the chain links 4 are rigidly connected. When retracted, the rigid connection can be converted into a hinged connection, and can be retracted to the worm-type chain storage box 7, which reduces the occupied time of the retracted state of the telescopic device. volume. the

3. The line speeds of the wire rope 9 and the telescopic chain 20 are the same, and the reel 10 and the sprocket 6 are driven by the same motor 5, which ensures the speed matching between the mechanisms. the

4. The linear telescopic device does not rely on gravity to maintain straight extension, and can extend at any angle in space. the

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention are included in the protection scope of the present invention. the

Claims (10)

1. A linear telescopic device, characterized in that the device comprises a telescopic chain, a wire rope, a volute chain storage box and a driving mechanism, wherein: There is a channel extending along a helical line in the volute chain storage box; The telescopic chain can be bent in one direction, and after it is bent in one direction, it is wrapped in the channel of the worm-type chain storage box, and the head end of the telescopic chain is located outside the worm-type chain storage box, and the head end Able to expand and contract in a straight line; The steel wire rope is located on the back side of the one-way bending direction of the telescopic chain, one end of which is wound on the reel, and the other end is fixed to the head end of the telescopic chain, and the wire rope can follow the head end of the telescopic chain Synchronous expansion and contraction, after the first end is stretched out, the stretching rope stretches the protruding part of the stretching chain into a straight line; The driving mechanism is respectively connected to the telescopic chain and the steel wire rope to drive the expansion and contraction of the telescopic chain and the steel wire rope, and the telescopic chain and the steel wire rope have the same linear velocity. 2. The linear expansion device according to claim 1, characterized in that, the helix of the channel is set as an Archimedes helix. 3. The linear expansion device according to claim 1, characterized in that, the outlet of the channel is connected with a support nozzle, the inner cavity of the support nozzle communicates with the channel, and the inner cavity is along the The telescopic chain extends in the direction in which it extends straight, and is used to guide the expansion and contraction of the telescopic chain. 4. The linear telescopic device according to claim 3, wherein the other end of the wire rope is fixed to the telescopic chain after passing through the box body of the volute chain storage box and extending along the inner cavity head end. 5. The linear telescopic device according to any one of claims 1.4, characterized in that, the telescopic chain has several chain links, and the chain links are in a rectangular structure, and the rectangular structure includes a bottom surface and a top opposite to the bottom surface. surface and two end faces located in the length direction of the telescopic chain; wherein: The two ends of the bottom surface of the adjacent chain links are hinged by a pin shaft, and the axial direction of the pin shaft is perpendicular to the length direction of the telescopic chain, so that the telescopic chain can be bent toward the bottom surface ; Adjacent end surfaces of adjacent chain links can be fitted together to prevent the telescopic chain from bending toward the top surface. 6. The linear telescopic device according to claim 5, characterized in that, the back of the chain link has a bar-shaped groove, and the extending direction of the groove is the length direction of the telescopic chain for accommodating the Described wire rope. 7. The linear expansion device according to claim 6, characterized in that, the back of the chain link has two grooves, and the two grooves are parallel; correspondingly, There are two steel wire ropes, and the two steel wire ropes are parallel. 8. The linear telescopic device according to claim 5, wherein the driving mechanism comprises a motor, a pulley set and a sprocket, and the motor drives the sprocket and the pulley set to run synchronously, the The sprocket drives the expansion and contraction of the telescopic chain, and the pulley set drives the rotation of the drum. 9 . The linear expansion device according to claim 8 , wherein a roller is installed on the pin shaft, and the roller meshes with the sprocket. 10 . 10. The linear expansion device according to claim 8, characterized in that, the motor, the sprocket and the reel are respectively installed on the box body of the worm type chain storage box, and the pulley set The driving pulley is installed coaxially with the sprocket and runs synchronously, and the driven pulley of the pulley set is installed coaxially with the reel and runs synchronously.