CN111332081A - Traction mechanism for transfer vehicle and use method thereof - Google Patents

Abstract

The invention relates to the technical field of traction equipment, in particular to a traction mechanism for a transfer trolley and a using method thereof. The traction mechanism for the transfer trolley and the use method thereof have the advantages that the connection and the disassembly between the transfer trolleys are convenient, the operation is simple and convenient, the working efficiency is improved, the steering is convenient, the connection part can not be separated, and meanwhile, the buffer mechanism is utilized to buffer the inertia force between the transfer trolleys, so that the parts in the transfer trolleys can not fall off, and the stability, the reliability and the safety of the transportation are improved.

Description

Traction mechanism for transfer vehicle and use method thereof

Technical Field

The invention relates to the technical field of traction equipment, in particular to a traction mechanism for a transfer trolley and a using method thereof.

Background

In machining or warehouse, the transportation in-process of spare part needs to adopt the transportation dolly to transport, can usually be with a plurality of transportation dollies line end to end under the great condition of transportation volume to increase the transporting capacity, improve and transport efficiency.

The existing transfer trolley connecting mode is generally connected in a towing hook or a bolt mode, but the connecting mode is simple in structure, when two trolleys are located on uneven road surfaces, the height is inconsistent, the connection is difficult, jolting vibration can be generated in the transportation process, unhooking and falling are easy to cause, the steering is not convenient, the connection part is easy to block, the steering is difficult, the transfer trolleys are mutually collided under the action of inertia force due to the fact that starting and sudden braking of traction equipment are driven in the transfer process, parts on the transfer trolleys are caused to fall, even the transfer trolleys are subjected to side turning accidents, and the transfer trolleys are quite dangerous.

Disclosure of Invention

The object of the present invention is to provide a traction mechanism for a transfer vehicle and a method of use thereof, which solves the problems set forth in the background art mentioned above.

In order to achieve the purpose, the invention provides the following technical scheme:

in a first aspect, the application provides a traction mechanism for a transfer trolley and a using method of the traction mechanism, the traction mechanism comprises a first fixed connecting plate and a second fixed connecting plate, a buffer mechanism is arranged on the first fixed connecting plate, a multi-angle connecting rod mechanism is arranged on the second fixed connecting plate, the buffer mechanism and the multi-angle connecting rod mechanism are buckled through a connecting mechanism, and the buffer mechanism can be in buckling contact with the multi-angle connecting rod mechanism and can be locked and limited.

Preferably, the buffer mechanism comprises a first movable connecting plate, a sliding groove is formed in the first fixed connecting plate, a separating block is fixed in the middle of the sliding groove, a sliding rod is fixed in the sliding groove, sliding blocks are connected to the sliding rod in a sliding mode and located on two sides of the separating block respectively, the sliding blocks are connected with the corresponding end portions inside the sliding groove through springs, and the sliding blocks are hinged to the first movable connecting plate through a first connecting rod.

Preferably, be fixed with the column casing on the separation piece, and the column casing is perpendicular with first swing joint board, and the middle part sliding connection of first swing joint board has T shape pole, and the T shape end sliding connection of T shape pole is in the column casing to the T shape pole passes through spring two and is connected with the left end of column casing, and first swing joint board is passed to the other end of T shape pole, and this end fixed connection push pedal.

Preferably, the multi-angle link mechanism comprises a second movable connecting plate, a plurality of first ball pin seats are fixed on the side face of the second movable connecting plate, a through groove communicated with the inside of the first ball pin seats is formed in the second movable connecting plate, an ejector rod is connected in the through groove in a sliding mode, a baffle is fixed at one end, pointing to the first movable connecting plate, of the ejector rod, the baffle is connected with the second movable connecting plate through a third spring, the push plate can be in abutting-buckling contact with the baffle, and the other end of the ejector rod is fixedly connected with a friction rod.

Preferably, a plurality of second ball pin seats corresponding to the first ball pin seats are fixed on the second fixed connecting plate, balls are arranged in the first ball pin seats and the second ball pin seats, the friction rods can be in buckling contact with balls in the corresponding first ball pin seats, the balls can move in the corresponding ball pin seats, the two corresponding balls are fixedly connected through a second connecting rod, and the second connecting rods are completely identical in structure and parallel to each other.

Preferably, the connecting mechanisms are arranged in a plurality and are uniformly distributed at the side edges of the first movable connecting plate and the second movable connecting plate.

Preferably, the connecting mechanism comprises a connecting sleeve fixed on the first movable connecting plate, through openings are formed in the left end face and the right end face of the connecting sleeve, the central axis of each through opening is overlapped with the central axis of the connecting sleeve, and the inner diameter of each through opening is smaller than the inner diameter of the connecting sleeve.

Preferably, the connecting mechanism further comprises a screw fixed on the second movable connecting plate, the screw is perpendicular to the second movable connecting plate, a sliding sleeve is sleeved on the screw and can slide on the screw, one end, far away from the second movable connecting plate, of the sliding sleeve is fixedly connected with a rotary table in a rotating mode, and the rotary table is in threaded connection with the screw.

Preferably, the periphery equipartition of sliding sleeve is provided with the buckle, and the buckle is parallel with the screw rod, and the length of buckle equals with the length of connecting sleeve inner chamber, each the buckle all is articulated with the outer wall of sliding sleeve through two connecting rods three, and two connecting rods three are parallel to each other, and the screw rod lateral wall is fixed with the uide bushing that corresponds with the buckle, and the uide bushing is perpendicular with the buckle that corresponds, and sliding connection has guide bar in the uide bushing, the buckle that guide bar fixed connection corresponds.

In a second aspect, the present application also provides a method of using a traction mechanism for a transfer car, comprising the steps of:

the method comprises the following steps: the multi-angle connecting rod mechanism is connected with the buffer mechanism through the connecting mechanism;

step two: the transfer trolley is convenient to steer through the multi-angle connecting rod mechanism;

step three: the buffer mechanism is used for buffering the transfer trolley and locking the multi-angle link mechanism.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the transfer trolleys are conveniently connected and detached through the connecting mechanism, the operation is simple and convenient, the working efficiency is improved, the joint between the transfer trolleys cannot be blocked and is convenient to turn by utilizing the multi-angle connecting rod mechanism, the vibration force applied to the joint can be greatly reduced, and the joint cannot be separated, so that the connection stability of the transfer trolleys in the transportation process is ensured.

Utilize buffer gear simultaneously, realize playing the cushioning effect to the inertial force between the transportation dolly, avoid causing the transportation dolly to lead to the fact the collision each other under the inertial force effect because of drive pulling equipment's start-up and sudden brake to ensure that the spare part in the transportation dolly does not drop, improve the reliable and stable nature of transportation, and avoid causing the transportation dolly to take place the accident of turning on one's side under the inertial force effect because of drive pulling equipment's sudden brake, improve fail safe nature.

Drawings

FIG. 1 is a first schematic view of the cross-sectional structure of the final assembly of the present invention;

FIG. 2 is a schematic view of the cross-sectional structure of the final assembly of the present invention;

FIG. 3 is a schematic view of the cross-sectional structure A-A of FIG. 1;

FIG. 4 is an enlarged view of the structure at B in FIG. 2;

FIG. 5 is a first schematic view of a connection mechanism according to the present invention;

FIG. 6 is a second schematic structural view of a connecting mechanism according to the present invention;

fig. 7 is a top view of the structure of the buffer mechanism of the present invention.

In the figure: 1-a first fixed connection plate; 2-a spacer block; 3-a slide block; 4-a chute; 5-a slide bar; 6, a first spring; 7-column casing; 8-spring two; 9-a first swing joint plate; a 10-T shaped rod; 11-connecting rod one; 12-a connecting sleeve; 13-push plate; 14-a second swing joint plate; 15-a first fixed connection plate; 16-link two; 17-beads; 18-a first ball keyway; 19-a second ball keyway; 20-through grooves; 21-a mandril; 22-a friction bar; 23-a baffle plate; 24-spring three; 25-a through hole; 26-link three; 27-a guide sleeve; 28-a guide bar; 29-buckle plate; 30-a sliding sleeve; 31-a turntable; 32-screw.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Referring to fig. 1 to 7, the present invention provides a technical solution:

a traction mechanism for a transfer trolley and a using method thereof comprise a first fixed connecting plate 1 and a second fixed connecting plate 15, wherein a buffer mechanism is arranged on the first fixed connecting plate 1, a multi-angle connecting rod mechanism is arranged on the second fixed connecting plate 15, the buffer mechanism and the multi-angle connecting rod mechanism are buckled and connected through a connecting mechanism, the buffer mechanism can be in buckled contact with the multi-angle connecting rod mechanism and can be locked and limited, the first fixed connecting plate 1 is fixedly connected to a tail frame of the transfer trolley through fixed connection modes such as welding and bolts, the second fixed connecting plate 15 is fixedly connected to a front frame of the transfer trolley through fixed connection modes such as welding and bolts, and when a plurality of transfer trolleys are connected in series, the multi-angle connecting rod mechanism of the next transfer trolley is connected with the buffer mechanism of the previous trolley.

In this embodiment, the buffering mechanism includes a first movable connecting plate 9, a sliding groove 4 has been provided on the first fixed connecting plate 1, a separating block 2 is fixed at the middle part of the sliding groove 4, a sliding rod 5 is fixed in the sliding groove 4, a sliding block 3 is connected on the sliding rod 5 in a sliding manner, and two sliding blocks 3 are respectively located at two sides of the separating block 2, the sliding block 3 is connected with the end corresponding to the inside of the sliding groove 4 through a spring one 6, the sliding blocks 3 are all hinged to the first movable connecting plate 9 through a connecting rod one 11, the connecting rods one 11 on the two sliding blocks 3 are arranged in a splayed manner, and when the two sliding blocks 3 are attached to the separating block 2, the two connecting rods one 11 are not parallel, as shown in fig. 7, a plurality of connecting rods one 11 can be connected side by side on the same.

In this embodiment, a column 7 is fixed on the separation block 2, the column 7 is perpendicular to the first movable connecting plate 9, the middle of the first movable connecting plate 9 is connected with a T-shaped rod 10 in a sliding manner, a T-shaped end of the T-shaped rod 10 is connected in the column 7 in a sliding manner, the T-shaped rod 10 is connected with the left end of the column 7 through a second spring 8, the other end of the T-shaped rod 10 penetrates through the first movable connecting plate 9, and the push plate 13 is fixedly connected with the other end.

In this embodiment, the multi-angle link mechanism includes a second movable connecting plate 14, a plurality of first ball pin seats 18 are fixed on a side surface of the second movable connecting plate 14, as shown in fig. 3, the plurality of first ball pin seats 18 are not located on a same straight line, a through groove 20 communicated with the inside of the first ball pin seat 18 is formed in the second movable connecting plate 14, a push rod 21 is slidably connected in the through groove 20, a baffle 23 is fixed at one end of the push rod 21 pointing to the first movable connecting plate 9, the baffle 23 is connected with the second movable connecting plate 14 through a third spring 24, the push plate 13 can be in abutting contact with the baffle 23, and a friction rod 22 is fixedly connected to the other end of the push rod 21.

In this embodiment, a plurality of second ball sockets 19 corresponding to the first ball sockets 18 are fixed on the second fixed connecting plate 15, balls 17 are disposed in the first ball sockets 18 and the second ball sockets 19, the friction rod 22 can be in contact with the balls 17 in the corresponding first ball sockets 18, the balls 17 can move in the corresponding ball sockets, the two corresponding balls 17 are fixedly connected through the second connecting rods 16, the second connecting rods 16 are identical in structure and parallel to each other, and the balls 17 are connected with the ball sockets in a ball hinge manner.

In this embodiment, the connecting mechanisms are provided in plurality and are uniformly distributed at the side edges of the first swing joint plate 9 and the second swing joint plate 14.

In this embodiment, the connecting mechanism includes a connecting sleeve 12 fixed on the first movable connecting plate 9, through holes 25 are formed in both left and right end faces of the connecting sleeve 12, a central axis of each through hole 25 coincides with a central axis of the connecting sleeve 12, and an inner diameter of each through hole 25 is smaller than an inner diameter of the connecting sleeve 12.

In this embodiment, the connecting mechanism further includes a screw 32 fixed on the second movable connecting plate 14, the screw 32 is perpendicular to the second movable connecting plate 14, a sliding sleeve 30 is sleeved on the screw 32, the sliding sleeve 30 can slide on the screw 32, one end of the sliding sleeve 30 far away from the second movable connecting plate 14 is fixed-axis-rotatably connected to a rotating disc 31, and the rotating disc 31 is in threaded connection with the screw 32.

In this embodiment, the periphery equipartition of sliding sleeve 30 is provided with buckle 29, and buckle 29 is parallel with screw rod 32, and buckle 32's length equals with the length of connecting sleeve 12 internal cavity, each buckle 29 all articulates with sliding sleeve 30's outer wall through two connecting rods three 26, and two connecting rods three 26 are parallel to each other, and screw rod 32 lateral wall is fixed with the uide bushing 27 that corresponds with buckle 29, and uide bushing 27 is perpendicular with the buckle 29 that corresponds, and sliding connection has guide bar 28 in the uide bushing 27, and guide bar 28 fixed connection corresponds buckle 29.

The use and advantages of the present invention are described below in conjunction with the method of use of the present application: when the traction mechanism for the transfer trolley is used, the traction mechanism comprises the following steps:

the method comprises the following steps: as shown in fig. 5, in the initial state, the guide rod 28 is completely inside the guide sleeve 27, i.e. the pinch plate 29 is closest to the screw 32, so that the pinch plate 29 can pass through the through opening 25 at the end of the connecting sleeve 12;

as shown in fig. 1 and 2, when the transfer trolleys are connected, the second movable connecting plate 14 at the front part of the next transfer trolley is involuted with the first movable connecting plate 9 at the tail part of the previous transfer trolley, because a parallel four-bar linkage mechanism can be formed between any two connecting rods 16 between the second fixed connecting plate 15 and the second movable connecting plate 14, and balls 17 at two ends of the connecting rods 16 can move in corresponding ball pin seats, the second movable connecting plate 14 can realize multi-angle adjustment, and can be always kept parallel to the second fixed connecting plate 15 in the adjustment process, even if the previous transfer trolley and the next transfer trolley are not at the same height or on the same central axis, the second movable connecting plate 14 can be corresponding to the first movable connecting plate 9 by adjusting the position of the second movable connecting plate 14, thereby facilitating the connection between the transfer trolleys, the connecting difficulty is greatly reduced;

after the second movable connecting plate 14 and the first movable connecting plate 9 correspond to each other, the screw 32 on the second movable connecting plate 14 passes through the two through holes 25 of the connecting sleeve 12, and the buckle plate 29 is positioned inside the connecting sleeve 12, as shown in fig. 4, the rotating disc 31 is held and rotated, at this time, the sliding sleeve 30 does not rotate, the rotation of the rotating disc 31 is pushed to the right under the action of screw transmission, and the sliding sleeve 30 is pushed to the right to move on the screw 32 synchronously, the right movement of the sliding sleeve 30 applies thrust to the corresponding buckle plate 29 through the third connecting rod 26, the thrust makes the buckle plate 29 be far away from the screw 32, and the guide rod 28 is driven to extend out from the guide sleeve 27 synchronously until the buckle plate 29 is attached to the inner wall of the connecting sleeve 12, and two ends of the buckle plate 29 are in abutting contact with two end walls inside the connecting sleeve 12, so as to complete the connection of the first movable connecting plate 9 and the second, the connection between the transfer trolleys is further completed, as shown in fig. 1, after the connection between the first movable connection plate 9 and the second movable connection plate 14 is completed, the push plate 13 is in contact fit with the baffle plate 23, but no force is applied between the push plate 13 and the baffle plate 23, so that the whole connection process is simple and convenient to operate, and time and labor are saved;

when the connection between the transport trolleys needs to be released, as shown in fig. 6 and 5, the turntable 31 is held and rotates reversely, the reverse rotation of the turntable 31 is pulled leftwards to move under the action of screw transmission, and the sliding sleeve 30 is driven to move leftwards synchronously on the screw 32, the left movement of the sliding sleeve 30 applies a pulling force to the corresponding buckle plate 29 through the third connecting rod 26, the pulling force enables the buckle plate 29 to be close to the screw 32, and synchronously drives the guide rod 28 to retract into the guide sleeve 27 until the guide rod 28 is completely positioned in the guide sleeve 27 as shown in fig. 5, the buckle plate 29 restores to the initial state position and can be moved out from the through hole 25 of the connecting sleeve 12, so that the first movable connecting plate 9 and the second movable connecting plate 14 are detached, namely, the connection between the transport trolleys is released, the process operation is simple and convenient, and the working efficiency is improved;

step two: after the transfer trolleys are connected, the traction equipment pulls and pulls the transfer trolleys, when the front transfer trolleys and the rear transfer trolleys are not on the same central axis due to uneven road surfaces or steering in the moving process of the transfer trolleys, due to the fact that the multi-angle link mechanism is a combination of a plurality of parallel four-link mechanisms, as shown in figure 2, the second movable connecting plate 14 and the second fixed connecting plate 15 are staggered, due to the fact that the balls 17 at the two ends of the second connecting rod 16 and the corresponding ball pin seats can freely rotate in all directions, torsion perpendicular to the central axis generated when the front transfer trolleys and the rear transfer trolleys are not on the same central axis due to uneven road surfaces or steering is released through adaptive inclination of the second connecting rod 16, and therefore the connecting positions between the transfer trolleys cannot be clamped and are convenient to steer;

in the transportation process, when encountering a bumpy road surface, the multi-angle connecting rod mechanism can release the torsion force which is applied to the joint and is generated by the torsion force perpendicular to the central axis, so that the vibration force applied to the joint is greatly reduced, the joint is ensured not to be separated, and the threaded connection between the rotary disc 31 and the screw 32 has the axial self-locking characteristic, so that the stable buckling connection between the buckling plate 29 and the inner wall of the connecting sleeve 12 can be ensured, the separation of the joint due to the bump of the road surface is avoided, and the connection stability of the transfer trolley in the transportation process is ensured;

step three: as shown in figures 1 and 2, in the transferring process of the transferring trolley, when the traction equipment is started and braked, due to the action of inertia force, the latter transferring trolley is close to or away from the former trolley, at the moment, the multi-angle link mechanism applies pushing force or pulling force to the first movable connecting plate 9 through the connecting mechanism, the pushing force or the pulling force enables the first movable connecting plate 9 to be close to or away from the first fixed connecting plate 1, the connecting rod I11 applies pushing force or pulling force to the corresponding sliding block 3 to enable the two sliding blocks 3 to be close to or away from each other, and then the sliding block 3 stretches or compresses the spring I6 in the corresponding sliding groove 4, so that the inertia force between the transferring trolleys is buffered, the transferring trolleys are prevented from colliding with each other under the action of inertia force due to the driving of the starting and sudden braking of the traction equipment, and parts in the transferring trolleys are prevented from falling, the stability and the reliability of transportation are improved;

as shown in fig. 4, when the second connecting plate 14 applies a pushing force to the first movable connecting plate 9, a pushing force is synchronously applied to the push plate 13 through the baffle plate 23, the pushing force causes the push plate 13 to drive the T-shaped rod 10 to move left in the cylinder 7 and compress the second spring 8, so that the second spring 8 obtains a rightward restoring force, the restoring force acts on the push plate 13 through the T-shaped rod 10, so that the support plate 13 applies a rightward pressure to the baffle plate 23, the baffle plate 23 applies a rightward pushing force to the friction rod 22 through the ejector rod 21, the baffle plate 23 compresses the third spring 24, the third spring 24 obtains a restoring force tending to reset the baffle plate 23, and the baffle plate 23 causes the friction rod 22 to be in abutting contact with the ball 17 in the first ball pin seat 18 and applies a friction force to the ball 17 to prevent the ball 17 from rotating in the first ball pin seat 18, thereby preventing the front transfer trolley and the rear transfer trolley from being not located on the same central axis, the force of the second connecting rod 16 on the second preceding transferring trolley is parallel to the central axis, so that a component force perpendicular to the central axis is generated, the component force is prevented from increasing along with the increase of the included angle between the second connecting rod 16 and the central axis, the component force parallel to the central axis is reduced along with the increase of the included angle between the second connecting rod 16 and the central axis, the buffering effect of a buffering mechanism is reduced, the situation that the tail of the second preceding transferring trolley tilts or the first preceding transferring trolley rolls over under the action of the inertia force due to the fact that the component force is perpendicular to the central axis is avoided, the friction rod 22 is made of rubber materials with textures at the contact position with the corresponding ball 17, the friction force between the friction rod 22 and the corresponding ball 17 ensures that the second connecting rod 16 cannot be subjected to the increase of the included angle between the inertia force and the central axis due to the action of the friction of driving the traction equipment, and the situation that the transferring trolley is subjected to roll over, the safety and reliability are improved.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A traction mechanism for a transfer trolley, comprising a first fixed connection plate (1) and a second fixed connection plate (15), characterized in that: the buffer mechanism is arranged on the first fixed connecting plate (1), the multi-angle connecting rod mechanism is arranged on the second fixed connecting plate (15), the buffer mechanism and the multi-angle connecting rod mechanism are buckled through the connecting mechanism, and the buffer mechanism can be in buckling contact with the multi-angle connecting rod mechanism and is limited in locking.

2. The towing mechanism for a transfer trolley according to claim 1, characterized in that: buffer gear includes first swing joint board (9), spout (4) have been seted up on first fixed connection board (1), the middle part of spout (4) is fixed with and separates block (2), spout (4) internal fixation has slide bar (5), sliding connection has slider (3) on slide bar (5), and two slider (3) are located the both sides that separate block (2) respectively, slider (3) are through the end connection of spring (6) and the inside correspondence of spout (4), slider (3) all are articulated with first swing joint board (9) through connecting rod (11).

3. A towing mechanism for a transfer trolley according to claim 2, characterised in that: the separation block (2) is fixed with a column casing (7), the column casing (7) is perpendicular to a first movable connecting plate (9), the middle of the first movable connecting plate (9) is connected with a T-shaped rod (10) in a sliding mode, the T-shaped end of the T-shaped rod (10) is connected into the column casing (7) in a sliding mode, the T-shaped rod (10) is connected with the left end of the column casing (7) through a second spring (8), the other end of the T-shaped rod (10) penetrates through the first movable connecting plate (9), and a push plate (13) is fixedly connected with the other end of the T-shaped rod.

4. A towing mechanism for a transfer trolley according to claim 3, characterised in that: the multi-angle connecting rod mechanism comprises a second movable connecting plate (14), a plurality of first ball pin seats (18) are fixed on the side face of the second movable connecting plate (14), a through groove (20) communicated with the inside of the first ball pin seats (18) is formed in the second movable connecting plate (14), an ejector rod (21) is connected in the through groove (20) in a sliding mode, a baffle (23) is fixed at one end, pointing to the first movable connecting plate (9), of the ejector rod (21), the baffle (23) is connected with the second movable connecting plate (14) through a third spring (24), the push plate (13) can be in abutting-buckling contact with the baffle (23), and a friction rod (22) is fixedly connected to the other end of the ejector rod (21).

5. The towing mechanism for a transfer trolley according to claim 4, characterized in that: a plurality of second ball pin seats (19) corresponding to the first ball pin seats (18) are fixed on the second fixed connecting plate (15), balls (17) are arranged in the first ball pin seats (18) and the second ball pin seats (19), the friction rod (22) can be in buckling contact with the balls (17) in the corresponding first ball pin seats (18), the balls (17) can move in the corresponding ball pin seats, the two corresponding balls (17) are fixedly connected through second connecting rods (16), and the second connecting rods (16) are completely identical in structure and are parallel to each other.

6. The towing mechanism for a transfer trolley according to claim 4, characterized in that: the connecting mechanisms are arranged in a plurality of numbers and are uniformly distributed at the side edges of the first movable connecting plate (9) and the second movable connecting plate (14).

7. The towing mechanism for a transfer trolley according to claim 6, characterized in that: the connecting mechanism comprises a connecting sleeve (12) fixed on a first movable connecting plate (9), through openings (25) are formed in the left end face and the right end face of the connecting sleeve (12), the central axis of each through opening (25) coincides with the central axis of the connecting sleeve (12), and the inner diameter of each through opening (25) is smaller than that of the connecting sleeve (12).

8. The towing mechanism for a transfer trolley according to claim 7, characterized in that: coupling mechanism is still including fixing screw rod (32) on second swing joint board (14), and screw rod (32) and second swing joint board (14) are perpendicular, sliding sleeve (30) have been cup jointed on screw rod (32), sliding sleeve (30) can slide on screw rod (32), sliding sleeve (30) are kept away from the one end dead axle rotation of second swing joint board (14) and are connected with carousel (31), carousel (31) and screw rod (32) threaded connection.

9. The towing mechanism for a transfer trolley according to claim 8, wherein: the periphery equipartition of sliding sleeve (30) is provided with buckle (29), buckle (29) are parallel with screw rod (32), and the length of buckle (32) equals with the length of connecting sleeve (12) inner cavity, each buckle (29) are all articulated through the outer wall of two connecting rods three (26) and sliding sleeve (30), and two connecting rod three (26) are parallel to each other, screw rod (32) lateral wall is fixed with uide bushing (27) that correspond with buckle (29), uide bushing (27) are perpendicular with buckle (29) that correspond, and sliding connection has guide bar (28) in uide bushing (27), buckle (29) that guide bar (28) fixed connection corresponds.

10. Use of a traction mechanism for a transfer trolley according to claim 9, characterised in that: the method comprises the following steps:

the method comprises the following steps: the multi-angle connecting rod mechanism is connected with the buffer mechanism through the connecting mechanism;

step two: the transfer trolley is convenient to steer through the multi-angle connecting rod mechanism;

step three: the buffer mechanism is used for buffering the transfer trolley and locking the multi-angle link mechanism.

Images