CN212023267U

CN212023267U - Linkage pressing mechanism

Info

Publication number: CN212023267U
Application number: CN202020659488.XU
Authority: CN
Inventors: 徐永康; 沈加全
Original assignee: Shanghai Mianfeng Metal Products Factory
Current assignee: Shanghai Mianfeng Metal Products Factory
Priority date: 2020-04-26
Filing date: 2020-04-26
Publication date: 2020-11-27
Anticipated expiration: 2030-04-26

Abstract

The utility model belongs to the technical field of automobiles, in particular to a linkage compressing mechanism, which comprises a main rotating compression bar, at least two slave rotating compression bars and a locking mechanism, wherein the main rotating compression bar and the slave rotating compression bars are both provided with compressing structures and can be rotationally arranged on a substrate; the main rotating pressure rod and the slave rotating pressure rod are both provided with a pressing state that the pressing structure presses the upper surface of the workpiece to be pressed and a loosening state that the pressing structure rotates for a preset angle around a vertical axis to avoid the upper surface of the workpiece to be pressed. The linkage pressing mechanism with the structure realizes linkage of one main rotating pressing rod and at least two slave rotating pressing rods through the connecting rod group, so that the main rotating pressing rod and the slave rotating pressing rods have a pressing state that all pressing structures are pressed on the upper surface of a workpiece to be pressed and a loosening state that all pressing structures rotate to a preset angle to avoid the upper surface of the workpiece to be pressed, and the main rotating pressing rod is locked or unlocked through the locking mechanism. Simple structure, strong linkage and simple operation.

Description

Linkage pressing mechanism

Technical Field

The utility model belongs to the technical field of the car, concretely relates to linkage pressing mechanism.

Background

In the automatic production process of automobiles, the same automobile body parts need to be produced in large batch, and in order to effectively save the spatial layout of the production line, a material rack with multiple layers of supports is generally used in the existing automobile body part production line so as to be convenient for storage and transportation.

The positioning mechanism for supporting parts in the existing layered material rack can be retracted and released generally, namely, when the parts need to be supported, the positioning mechanism is leveled through manual operation or pneumatic element driving of an air cylinder and the like; when the parts do not need to be supported, the positioning mechanism is retracted upwards or downwards through manual operation or pneumatic element drive such as an air cylinder and the like; the positioning mechanism which is retracted and released by the positioning mechanism driven by a manual operation or a pneumatic element such as an air cylinder can only position the workpiece, but cannot compress and fix the workpiece, and the workpiece is easy to generate longitudinal jumping in the process of transporting the workpiece through the material rest to cause damage to the workpiece.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve lies in that current layering work or material rest can't realize compressing tightly the work piece, produces vertical jump easily and leads to the work piece impaired in carrying out the transportation to the work piece through the work or material rest.

Therefore, the utility model provides a linkage clamping mechanism, include:

the outer side wall of the main rotating compression rod is provided with a plurality of compression structures at intervals along the axial direction of the main rotating compression rod;

the outer side wall of the slave rotating compression rod is also provided with a plurality of compression structures at intervals along the axial direction;

the main rotating compression rod and the auxiliary rotating compression rod are both provided with a compression state that all the compression structures are compressed on the upper surface of a workpiece to be compressed and a loosening state that all the compression structures rotate around the vertical axis by a preset angle to avoid the upper surface of the workpiece to be compressed; and

the locking mechanism is arranged on the main rotating pressure rod and locks the main rotating pressure rod when the main rotating pressure rod is switched from a pressing state to a loosening state or from the loosening state to the pressing state so as to limit the main rotating pressure rod and the auxiliary rotating pressure rod to rotate around the corresponding vertical axes;

the connection line of the projection of the main rotating pressure rod and the projection of the auxiliary rotating pressure rod on the substrate form a triangular or polygonal structure.

Optionally, the linkage compressing mechanism, the linkage includes:

the first connecting rod is hinged with the main rotating compression rod at one end and is hinged with one of the auxiliary rotating compression rods at the other end;

one end of the second connecting rod is connected with the middle part of the first connecting rod in a sliding way, and the middle part of the second connecting rod is connected with the substrate;

one end of the third connecting rod is hinged with the other end of the second connecting rod, and the other end of the third connecting rod is hinged with the other slave rotation pressing rod;

the first connecting rod, the second connecting rod and the third connecting rod are arranged at a preset included angle; and the second connecting rod with the articulated one end of first connecting rod is equipped with one and follows the length direction extension of second connecting rod's bar spout, first connecting rod is in during the state of compressing tightly keep away from of bar spout with the articulated one end of third connecting rod be in during the unclamping state be close to of bar spout with the articulated one end of third connecting rod.

Optionally, the linkage compressing mechanism, the linkage further includes:

the fourth connecting rod is arranged on the main rotating pressure rod and the slave rotating pressure rod respectively;

two ends of the first connecting rod are respectively hinged to the fourth connecting rod of the main rotating pressure rod and one of the slave rotating pressure rods;

one end of the third connecting rod, which is far away from the second connecting rod, is hinged to the fourth connecting rod of the other slave rotating pressure rod.

Optionally, in the linkage compressing mechanism, the rotation directions of the master rotating compression bar and all the slave rotating compression bars are opposite.

Optionally, the linkage tightening mechanism includes:

the handle is fixedly connected with the main rotating pressure rod and is provided with a mounting hole;

the locking mechanism body can be inserted into the mounting hole to lock and unlock the main rotating pressure rod;

the top of main depression bar that rotates passes through the handle is rotationally installed on the mounting panel that sets firmly in the frame, be equipped with two on the mounting panel and become predetermine angle arrange can with the spacing hole that the locking mechanical system body cooperation was locked.

Optionally, a linkage straining device, the locking mechanism body is the spring bolt, includes:

the guide sleeve is internally provided with a guide cavity, and the bottom end of the guide sleeve is abutted against the upper part of the mounting hole on the handle;

the bolt is rod-shaped and can be vertically and telescopically arranged in the guide sleeve, and the outer wall surface of the bolt is provided with a limiting ring which protrudes and extends outwards along the radial direction; and

the reset elastic piece is arranged in the guide cavity and sleeved on the periphery of the bolt, one end of the reset elastic piece is abutted against the inner top wall of the guide sleeve, the other end of the reset elastic piece is abutted against the limiting ring and applies reset biasing force which tends to extend out of the guide sleeve to the bolt;

the two ends of the bolt partially extend out of the guide sleeve, and the bottom end of the bolt can vertically extend out of the guide sleeve and be inserted into the limiting hole to lock the main rotating pressure rod and vertically retract to be separated from the limiting hole to unlock the main rotating pressure rod.

Optionally, a linkage straining device, the locking mechanism body is step-shaped, includes:

the locking part is in a rod shape and can be vertically and telescopically inserted into the mounting hole;

and the operating part is in a rod shape and is arranged above the locking part, and the diameter of the operating part is larger than that of the locking part and is erected above the mounting hole on the handle.

Optionally, the compressing mechanism is a compressing piece which is radially outwardly protruded from the outer wall surface of the main rotating compression bar or the secondary rotating compression bar, and all the compressing pieces are protruded to be consistent in length.

Optionally, when the main rotating compression bar and the slave rotating compression bar are in a compressed state, the compression structure on the main rotating compression bar and the compression structure on the slave rotating compression bar both face the inner side of the formed triangular or polygonal structure.

Optionally, in the linkage pressing mechanism, the preset angle is 90 °.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a pair of linkage pressing mechanism, include: the outer side wall of the main rotating compression rod is provided with a plurality of compression structures at intervals along the axial direction of the main rotating compression rod;

the main rotating pressure rod and the auxiliary rotating pressure rod are both provided with a pressing state that the pressing structure is pressed on the upper surface of a workpiece to be pressed and a loosening state that the pressing structure rotates around the vertical axis by a preset angle to avoid the upper surface of the workpiece to be pressed; and

The linkage pressing mechanism with the structure realizes linkage of one main rotating pressing rod and at least two slave rotating pressing rods through the connecting rod group, the slave rotating pressing rods linked with the connecting rod group are driven to rotate in a linkage mode through rotating the main rotating pressing rods, so that the main rotating pressing rods and the slave rotating pressing rods have a pressing state that all pressing structures are pressed on the upper surface of a workpiece to be pressed and a loosening state that all pressing structures rotate to preset angles to the pressing structures to avoid the upper surface of the workpiece to be pressed, and the main rotating pressing rods are locked or unlocked through the locking mechanism. Simple structure, strong linkage and simple operation.

2. The utility model provides a pair of linkage straining device, the linkage is the connecting rod of predetermineeing the contained angle setting through being of a plurality of articulated connections to realize that the owner rotates the depression bar and rotates from the linkage between the rotation depression bar, simple structure, linkage nature is strong.

3. The utility model provides a pair of linkage straining device, locking mechanism include the handle and fix the locking mechanism body on the handle, and the locking mechanism body includes uide bushing and bolt and the elastic component that resets, makes the bolt upwards stretch out through the operation bolt and breaks away from spacing hole and removes the locking to the main depression bar that rotates or stretch out the uide bushing downwards under the reset action of the elastic component that resets and insert and arrange spacing downthehole realization in to the locking of main depression bar that rotates, simple structure, convenient operation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a linkage pressing mechanism of embodiment 1 of the present invention mounted on a substrate;

fig. 2 is a schematic structural view of the linkage pressing mechanism of embodiment 1 of the present invention locked in a pressing state;

fig. 3 is a schematic structural view of the linkage pressing mechanism according to embodiment 1 of the present invention when the main rotating pressing rod and the locking mechanism are locked together;

FIG. 4 is a partial enlarged structural view of A in FIG. 3;

fig. 5 is a schematic structural diagram of a linkage pressing mechanism according to embodiment 1 of the present invention;

FIG. 6 is a schematic structural view of a second link of the linkage of FIG. 5;

fig. 7 is a schematic structural view of a locking mechanism body of the linkage pressing mechanism in embodiment 1 of the present invention;

fig. 8 is a cross-sectional structural view of the locking mechanism body in fig. 7.

Description of reference numerals:

10-a main rotating compression bar;

20-a slave rotation pressure lever;

30-a compression structure;

40-linkage; 41-a first link; 42-a second link; 420-a strip chute; 421-a first end; 422-a second end; 43-a third link; 44-a fourth link;

50-a locking mechanism; 51-a locking mechanism body; 511-a guide sleeve; 512-a bolt; 513-operating the disc; 514-a guide cavity; 515-a stop collar; 52-a handle;

60-a substrate;

70-mounting a plate; 71-limiting hole.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

A linkage pressing mechanism of the present embodiment, as shown in fig. 1 to 8, includes a main rotating pressing rod 10, two slave rotating pressing rods 20, a plurality of pressing structures 30, a linkage 40 and a locking mechanism 50, wherein the main rotating pressing rod 10, the slave rotating pressing rods 20 and the linkage 40 are all rotatably disposed on a base plate 60 around a vertical axis (not shown) perpendicular to the surface of the base plate 60; specifically, the substrate 60 is a quadrilateral plate structure with a plane upper surface, which is placed on the ground, and the main rotating compression bar 10 and the auxiliary rotating compression bar 20 are both rod-shaped and are arranged perpendicular to the upper surface of the substrate 60; one main rotating pressure rod 10 is in linkage connection with two auxiliary rotating pressure rods 20 through a connecting rod group 40; the outer side walls of the main rotating compression rod 10 and the auxiliary rotating compression rod 20 are respectively provided with a plurality of compression structures 30 which are arranged at intervals along the axial direction and protrude outwards in the radial direction, and the main rotating compression rod 10 and the auxiliary rotating compression rod 20 are respectively provided with a compression state that the compression structures 30 are compressed on the upper surface of a workpiece (not shown) to be compressed and a loosening state that the compression structures 30 rotate around a vertical axis by a preset angle to avoid the upper surface of the workpiece to be compressed; the locking mechanism 50 is arranged at the top end of the main rotating compression rod 10 and locks the main rotating compression rod 10 to limit the main rotating compression rod 10 and the slave rotating compression rod 20 to rotate around the respective corresponding vertical axes when the main rotating compression rod 10 is switched from a compression state to a release state or from the release state to the compression state; the connecting line of the projection of the main rotary pressure rod 10 and the slave rotary pressure rod 20 on the substrate 60 is formed into a triangular structure. Optionally, the triangle structure is an isosceles triangle structure or an equilateral triangle.

As shown in fig. 1 to 2 and 5, the linkage 40 includes a first link 41, a second link 42, a third link 43 and three fourth links 44, wherein one end of the first link 41 is hinged to one fourth link 44 fixed to the bottom of the main turning strut 10, and the other end is hinged to one fourth link 44 fixed to the bottom of one of the slave turning struts 20; one end of the second link 42 is slidably connected to the middle of the first link 41, the middle is connected to the base plate 60 through a fixed shaft (not shown), and the other end is hinged to the third link 43; one end of the third connecting rod 43 is hinged with the second connecting rod 42, and the other end is hinged with a fourth connecting rod 44 fixed at the bottom of the other slave rotating pressure rod 20; the first link 41, the second link 42, the third link 43 and the fourth link 44 are disposed at a preset included angle, such as an acute angle as shown in fig. 5, and the specific angle is not limited, so as to achieve the linked rotation between the links, which can be easily imagined by those skilled in the art; the directions of the fourth link 44 on the main rotating pressure rod 10 and the fourth link 44 on the slave rotating pressure rod 20 connected with the fourth link 44 through the first link 41 are opposite; as shown in fig. 6, a strip-shaped sliding groove 420 extending in the longitudinal direction of the second link 42 is formed at one end of the second link 42 connected to the first link 41, the first link 41 is located at one end of the strip-shaped sliding groove 420, which is far from the third link 43, in the compressed state, that is, in the state shown in fig. 5, and the first link 41 is located at one end of the strip-shaped sliding groove 420, which is near the third link 43, in the released state (not shown). For the convenience of description, an end of the bar-shaped sliding groove 420 away from the third link 43 is referred to as a first end 421, and an end close to the third link 43 is referred to as a second end 422. More specifically, as shown in fig. 5, the fourth link 44 on the main rotating pressure rod 10 faces upward left, and the fourth link 44 on the secondary rotating pressure rod 20 connected to the main rotating pressure rod 10 via the first link 41 faces downward right, so that when the main rotating pressure rod 10 rotates counterclockwise, the fourth link 44 on the main rotating pressure rod pulls the first link 41 to move upward right, and the fourth link 44 on the secondary rotating pressure rod 20 connected to the first link 41 rotates clockwise, i.e. moves upward right, and meanwhile, since the second link 42 is connected and fixed to the base plate 60 via a fixed shaft (not shown), both ends of the second link 42 rotate around the fixed shaft, the first link 41 moves to the second end 422 along the first end 421 of the strip-shaped sliding slot 420 on the second link 42 during the movement, and drives the hinged end of the second link 42 and the first link 41 to rotate away from the third link 43, and one end of the second connecting rod 42 hinged with the third connecting rod 43 rotates towards the direction close to the third connecting rod 43, so that the third connecting rod 43 pushes the fourth connecting rod 44 on the slave rotating compression rod 20 hinged with the third connecting rod to rotate towards the direction opposite to the rotating direction of the master rotating compression rod 10, namely the same direction as the rotating direction of the other slave rotating compression rod 20, until all the pressing structures 30 are not pressed on the upper surface of the workpiece to be positioned. On the contrary, when the main rotating compression rod 10 rotates clockwise, the main rotating compression rod 10 rotates and drives the rotating compression rod 20 to rotate counterclockwise through the linkage 40 until all the pressing structures 30 are pressed on the upper surface of the workpiece to be pressed. Alternatively, the linkage 40 may not include the fourth link 44, the two ends of the first link 41 are respectively connected to the master rotating pressure rod 10 and the slave rotating pressure rod 20 in a rotating manner, and the third link 43 is connected to the other slave rotating pressure rod 20 in a rotating manner. The hinge connection described above can be made by means of an existing conventional hinge shaft hinge connection.

As for the pressing structure 30, as shown in fig. 1 to 4, the pressing structure 30 is a pressing piece of a plate-like structure protruding radially from the outer side wall of each pressing rod. For the number of the pressing pieces, no limitation is made, and a person skilled in the art can select and design according to actual requirements, for example, as shown in fig. 1 to 3, each pressing rod is provided with 15 pressing pieces, the distance between each pressing piece is consistent, and the size of each pressing piece is consistent. The dimensions of the pressure pieces are not described or defined in detail. The pressing sheet can be fixed on the pressing rod by welding or can be connected by a connection mode which is easy to realize in the field, and is not particularly limited and described.

As for the locking mechanism 50, as shown in fig. 3 to 4 and fig. 7 to 8, a handle 52 and a locking mechanism body 51 are provided, the handle 52 is fixedly connected to the top end of the main rotating compression bar 10 for controlling the main rotating compression bar 10 to rotate around the corresponding vertical axis, and a mounting hole (not shown) is provided on the handle 52 for mounting the locking mechanism body 51; the locking mechanism body 51 can be inserted into the mounting hole and fixed on the handle 52, specifically, a mounting plate 70 mounted on a rack (not shown) above the substrate 60 is provided at the top end of the main rotating compression bar 10, the main rotating compression bar 10 can rotate relative to the mounting plate 70, the mounting plate 70 is located below the handle 52 and the locking mechanism body 51, two limiting holes 71 arranged at the preset angle (preferably 90 ° in this embodiment) are provided on the mounting plate 70, and the locking mechanism body 51 is used for locking the main rotating compression bar 10 by matching with the limiting holes 71. More specifically, as shown in fig. 7 to 8, the locking mechanism body 51 includes a rod-shaped plug pin 512, a tubular guide sleeve 511 and a return elastic member (not shown), the guide sleeve 511 has a guide cavity 514 therein, the plug pin 512 is inserted into the guide cavity 514 of the guide sleeve 511, and has upper and lower ends each having a portion extending to the outside of the guide sleeve 511, the top end of the plug pin 512 is provided with an operating disk 513 having a diameter larger than the outer diameter of the guide sleeve 511, and the outer wall of the plug pin 512 is provided with a stopper ring 515 having a radially outwardly protruding diameter consistent with the inner diameter of the guide sleeve 511; the reset elastic element is arranged in the guide cavity 514 and sleeved on the periphery of the plug pin 512, one end of the reset elastic element abuts against the inner top wall of the guide sleeve 511, the other end of the reset elastic element abuts against the limiting ring 515 and applies a biasing force to the plug pin 512, wherein the biasing force extends out of the guide sleeve 511 downwards; that is, the part of the lower end of the bolt 512 extending out of the guide sleeve 511 can be inserted into the limiting hole 71 to lock the main rotating compression bar 10 and move upward along the guide cavity 514 of the guide sleeve 511 until the bottom end of the bolt 512 is separated from the limiting hole 71 to unlock the main rotating compression bar 10. The specific locking and unlocking process is as follows: when the upward pulling force acting on the operation disc 513 is relieved, the bolt 512 extends out of the guide sleeve 511 under the reset action of the reset elastic piece and is inserted into the limiting hole 71 to lock the main rotating compression bar 10; when the unlocking is needed, the locking of the main rotating compression bar 10 can be released only by pulling the operating disc 513 upwards to retract the bottom end of the bolt 512 into the guide cavity 514 of the guide sleeve 511 and disengage from the limiting hole 71. It should be noted that, in the pressing state, the pressing structure 30 is perpendicular to the long side of the workpiece, and the preset angle in this embodiment is greater than or equal to 90 °, so that the pressing structure 30 can completely avoid the upper surface of the workpiece in the release state.

As an alternative embodiment, the locking mechanism body 51 of the present embodiment may also include only a locking portion (not shown) and an operating portion (not shown), the operating portion is integrally formed with the locking portion, the diameter of the operating portion is larger than that of the locking portion and larger than that of the mounting hole and the limiting hole 71, the diameter of the locking portion is the same as that of the mounting hole and the limiting hole 71, the locking mechanism body 51 is detachably connected to the handle 52, and the operating portion is located above the mounting hole in the locking state. When the main rotating compression bar 10 needs to be locked, the locking parts are sequentially inserted into the mounting holes and the limiting holes 71; when the lock needs to be released, the locking mechanism body 51 is directly pulled out from the limiting hole 71 and the mounting hole.

As another alternative, the number of the slave turning struts 20 in this embodiment may also be other numbers, such as three, four, five, etc., and a connection line between a projection of the slave turning struts 20 on the substrate 60 and a projection of the master turning strut 10 on the substrate 60 is formed in a polygonal structure, such as a quadrangle, a pentagon, a hexagon, etc.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A linkage clamping mechanism, comprising:

the main rotating compression bar (10) is rotatably arranged on the base plate (60) around a vertical axis perpendicular to the surface of the base plate (60), and a plurality of pressing structures (30) are arranged on the outer side wall of the main rotating compression bar (10) at intervals along the axial direction of the main rotating compression bar;

the at least two slave rotating compression rods (20) are linked with the master rotating compression rod (10) through a connecting rod group (40) and are rotatably arranged on the substrate (60), and a plurality of pressing structures (30) are also arranged on the outer side wall of each slave rotating compression rod (20) at intervals along the axial direction of the slave rotating compression rod;

the main rotating compression rod (10) and the auxiliary rotating compression rod (20) are both provided with a compression state that all the compression structures (30) are simultaneously compressed on the upper surface of a workpiece to be compressed and a release state that all the compression structures (30) rotate around the vertical axis by a preset angle to avoid the upper surface of the workpiece to be compressed; and

the locking mechanism (50) is arranged on the main rotating pressure rod (10) and locks the main rotating pressure rod (10) to limit the main rotating pressure rod (10) and the slave rotating pressure rod (20) to rotate around the corresponding vertical axes when the main rotating pressure rod (10) is switched from a pressing state to a loosening state or from the loosening state to the pressing state;

the connection line of the projection of the main rotary pressure rod (10) and the slave rotary pressure rod (20) on the substrate (60) is formed into a triangular or polygonal structure.

2. A linkage clamping mechanism according to claim 1, wherein said linkage (40) comprises:

a first connecting rod (41) with one end hinged with the main rotating compression bar (10) and the other end hinged with one of the auxiliary rotating compression bars (20);

a second connecting rod (42) with one end connected with the middle part of the first connecting rod (41) in a sliding way and the middle part connected with the base plate (60);

a third connecting rod (43) with one end hinged with the other end of the second connecting rod (42) and the other end hinged with the other slave rotating pressure rod (20);

the first connecting rod (41), the second connecting rod (42) and the third connecting rod (43) are arranged at a preset included angle; and the hinged end of the second connecting rod (42) and the first connecting rod (41) is provided with a strip-shaped sliding groove (420) extending along the length direction of the second connecting rod (42), the first connecting rod (41) is positioned at the end, far away from the third connecting rod (43), hinged with the strip-shaped sliding groove (420) in the pressing state, and is positioned at the end, close to the third connecting rod (43), hinged with the strip-shaped sliding groove (420) in the loosening state.

3. A linkage clamping mechanism according to claim 2, wherein said linkage (40) further comprises:

a fourth connecting rod (44), wherein the fourth connecting rod (44) is respectively arranged on the main rotating pressure rod (10) and the auxiliary rotating pressure rod (20);

two ends of the first connecting rod (41) are respectively hinged to the fourth connecting rod (44) of the main rotating compression rod (10) and one of the auxiliary rotating compression rods (20);

one end of the third connecting rod (43) far away from the second connecting rod (42) is hinged to the fourth connecting rod (44) of the other slave rotating pressure rod (20).

4. A linkage tightening mechanism according to claim 1 or 2, characterized in that the rotation directions of the master rotary presser (10) and all of the slave rotary pressers (20) are opposite.

5. A linkage tightening mechanism according to claim 1, characterized in that the locking mechanism (50) comprises:

the handle (52) is fixedly connected with the main rotating compression bar (10), and a mounting hole is formed in the handle (52);

a locking mechanism body (51) which can be inserted into the mounting hole to lock and unlock the main rotating pressure lever (10);

the top end of the main rotating pressure rod (10) is rotatably installed on a mounting plate (70) fixedly arranged on the rack through the handle (52), and two limiting holes (71) which are arranged at preset angles and can be matched with the locking mechanism body (51) to lock are formed in the mounting plate (70).

6. A linkage tightening mechanism according to claim 5, wherein the locking mechanism body (51) is a spring bolt comprising:

the guide sleeve (511) is internally provided with a guide cavity (514) and the bottom end of the guide sleeve is abutted above the mounting hole on the handle (52);

the bolt (512) is rod-shaped, can be vertically and telescopically arranged in the guide sleeve (511), and the outer wall surface of the bolt is provided with a limiting ring (515) which protrudes and extends outwards along the radial direction; and

the reset elastic piece is arranged in the guide cavity (514) and sleeved on the periphery of the bolt (512), one end of the reset elastic piece is abutted against the inner top wall of the guide sleeve (511), the other end of the reset elastic piece is abutted against the limiting ring (515) and applies reset biasing force tending to extend out of the guide sleeve (511) to the bolt (512);

both ends of the bolt (512) partially extend out of the guide sleeve (511), and the bottom end of the bolt (512) can vertically extend out of the guide sleeve (511) and is inserted into the limiting hole (71) to lock the main rotating pressure lever (10) and vertically retract to be separated from the limiting hole (71) to unlock the main rotating pressure lever (10).

7. A linkage tightening mechanism according to claim 5, wherein the locking mechanism body (51) is stepped and comprises:

and an operating part which is in a rod shape and is arranged above the locking part, has a diameter larger than that of the locking part, and is arranged above the mounting hole on the handle (52).

8. A linkage tightening mechanism according to claim 1, wherein the tightening structure (30) is a tightening piece that projects radially outward from the outer wall surface of the main rotating pressure lever (10) or the sub rotating pressure lever (20), and all the tightening pieces project to the same extent.

9. A linkage tightening mechanism according to claim 1 or 8, characterized in that the pressing structures (30) on the master rotating strut (10) and the slave rotating strut (20) are both directed towards the inside of the formed triangular or polygonal structure when the master rotating strut (10) and the slave rotating strut (20) are in a pressed state.

10. A linkage tightening mechanism according to claim 1 or 5, wherein the preset angle is 90 °.