CN115922380A

CN115922380A - Clamping structure

Info

Publication number: CN115922380A
Application number: CN202310172188.7A
Authority: CN
Inventors: 庄克玉; 朱桂新; 张伟; 孙绍华; 姚文龙
Original assignee: Qingdao University of Science and Technology
Current assignee: Qingdao University of Science and Technology
Priority date: 2023-02-27
Filing date: 2023-02-27
Publication date: 2023-04-07

Abstract

The invention discloses a clamping structure, which comprises a clamping mechanism bottom plate, a feeding mechanism and clamping support frames, wherein the feeding mechanism is positioned above the clamping mechanism bottom plate; the left side and the right side of the feeding mechanism are both provided with lifting grooves, one end of the supporting elastic part is connected with an elastic supporting plate, and a guide groove is formed in the joint of the lifting grooves and the elastic supporting plate. This clamping structure, the feed plate can be controlled under the effect of feed lead screw and remove, thereby drive the centre gripping hold-down mechanism on the feed plate, it carries out lateral shifting to drive panel, at the in-process of centre gripping, carry out automatic feed work in step, can raise the efficiency greatly, simultaneously in order to let panel can be faster to feed, feed mechanism still assists the installation on the centre gripping delivery sheet and assists the feeding wheel, at the in-process that panel removed, it can rotate at the roll inslot to assist the feeding wheel, reduce the friction between panel and the centre gripping delivery sheet, improve feed efficiency.

Description

Clamping structure

Technical Field

The invention relates to the technical field of clamping mechanisms, in particular to a clamping structure.

Background

More and more mechanical equipment and electric automatization inter combination, no matter be automatic cutting equipment or automatic drilling setting in the work of automatic panel processing, what be indispensable is fixture, can fix a position panel through fixture, avoid panel when operating to take place the displacement, the influence is to the processing effect of panel.

Through retrieval, the clamping device for welding the plate of the adjustable dust collection mechanism with the publication number of CN113458690B comprises a bottom plate, wherein a fixed plate is fixedly connected to the left side of the top surface of the bottom plate, a sliding plate is slidably connected to the right side of the top surface of the bottom plate, the clamping mechanism is slidably connected to the inner sides of the sliding plate and the fixed plate, a fixed block is fixedly connected to the right side of the top surface of the bottom plate, and a screw rod is in threaded connection with the side face of the fixed block. This kind of clamping device is used in panel welding process of adjustable dust absorption mechanism, place between two wedge blocks of homonymy through the metal sheet that will need the welded, then grasp the metal sheet through two inclined planes and pressure spring cooperation, then remove C shape slide, slide in fixed plate and sliding plate through C shape slide, adjust the butt joint to two needs welded metal sheets, then rotate the screw rod and make the sliding plate move to the left, reduce the interval between two needs welded metal sheets, and fix two metal sheets.

Meanwhile, the electric automatic clamping mechanism is searched, and the publication number is CN 108942750B. Electric automatization fixture includes driving piece, drive assembly and two grip blocks, drive assembly includes frame, two pushing away holds piece and two extension springs, frame fixed connection in on the casing of driving piece, two pushing away hold the piece all connect in on the output shaft of driving piece, two grip blocks support respectively hold in on two pushing away the lateral wall of holding the piece, two grip blocks pass through respectively two extension springs connect in the relative both sides of frame, be formed with the centre gripping space between two grip blocks, be provided with the flexible layer on the grip block, be provided with a plurality of centre gripping convex ridges on the flexible layer. The electric automatization fixture is difficult to damage the panel when clamping the panel.

However, when a plate is machined by using the conventional clamping structure, in order to improve machining automation efficiency, the plate needs to be pushed by using a pushing mechanism during machining, some plates need to be moved to a subsequent machining step, some plates need to be moved to a proper machining position, the plate needs to be loosened by the clamping structure first, and then the plate can be pushed.

Disclosure of Invention

The invention aims to provide a clamping structure to solve the problem that an electric automatic clamping mechanism provided by the background technology has a single function and is inconvenient to automatically feed a plate when the plate is clamped.

In order to achieve the purpose, the invention provides the following technical scheme: a clamping structure comprises a clamping mechanism bottom plate, a feeding mechanism and clamping support frames, wherein the feeding mechanism is positioned above the clamping mechanism bottom plate;

the feeding mechanism is characterized in that lifting grooves are formed in the left side and the right side of the feeding mechanism, supporting elastic pieces are installed above the lifting grooves, one ends of the supporting elastic pieces are connected with elastic supporting plates, guide grooves are formed in the joints of the lifting grooves and the elastic supporting plates, guide sliders are arranged inside the guide grooves, clamping supporting frames are fixed to the front side and the rear side of the feeding mechanism, a driving mechanism is arranged on one side of each clamping supporting frame, and a pressing mechanism is arranged below each driving mechanism.

Preferably, the feeding mechanism comprises a feeding plate, a feeding screw rod is arranged inside the feeding plate, one end of the feeding screw rod is connected with a screw rod motor, a clamping feeding plate is arranged above the feeding plate, a limiting slide rail is arranged at the joint of the clamping mechanism bottom plate and the feeding plate, a limiting slide block is arranged inside the limiting slide rail, and the feeding plate can slide on the clamping mechanism bottom plate through the limiting slide rail and the limiting slide block.

Preferably, the feeding mechanism further comprises a rolling groove, the rolling groove is formed in the upper end face of the clamping feeding plate, an auxiliary feeding wheel is arranged inside the rolling groove, the auxiliary feeding wheel rotates in the rolling groove, and the upper end face of the auxiliary feeding wheel is higher than the upper end face of the clamping feeding plate.

Preferably, the feeding plate is transversely moved on the feeding screw rod through a screw rod sleeve, the feeding plate is parallel to the clamping feeding plate, and the feeding plate is movably connected with the clamping feeding plate.

Preferably, actuating mechanism includes drive box casing, the internal connection of drive box casing has the gag lever post, the rotary rod is installed to the below of gag lever post, and the one end of rotary rod is connected with transmission sector gear, the other end of rotary rod is connected with the drive connecting rod, and the other end of drive connecting rod is connected with stop gear, step motor is installed to transmission sector gear's input.

Preferably, the limiting rods are symmetrically arranged about the vertical center of the driving box shell, the two groups of driving sector gears are meshed with each other, the driving sector gears, the rotating rod, the driving connecting rod and the limiting gears are connected with each other in a pin mode, and the two groups of limiting gears are meshed with each other.

Preferably, the mechanism of pushing down includes briquetting down, the below of briquetting is provided with the pressure strip down, and the below mid-mounting of pressure strip has infrared distance sensor, limit gear and briquetting key-type connection down, drive box casing and transmission sector gear key-type connection, and transmission sector gear and step motor key-type connection to the briquetting passes through transmission sector gear, rotary rod, drive connecting rod, limit gear and realizes elevating movement on drive box casing down.

Preferably, push down the mechanism still including installing the holding head in infrared distance sensor's the left and right sides, the internally mounted of holding head has the telescope tube, telescope tube's inside is provided with the telescopic link, and telescope tube's surface cover is equipped with buffer spring, the below of telescopic link is installed and is compressed tightly the elasticity piece, and compresses tightly the left and right sides of elasticity piece and all be provided with pressure sensor, pressure sensor's output is connected with the PLC controller, step motor and lead screw motor all with PLC controller electric connection, and pressure sensor and infrared distance sensor all with PLC controller electric connection.

Preferably, the telescopic rod and the telescopic sleeve form a telescopic structure, the compression elastic block forms a telescopic structure through the buffer spring, the telescopic rod, the telescopic sleeve and the clamping head, and the compression elastic block penetrates through the clamping head.

Preferably, the elastic support plate realizes sliding movement on the lifting groove through the guide groove and the guide sliding block, the elastic support plate forms a telescopic structure through the support elastic part and the lifting groove, the support elastic part is uniformly distributed along the end face of the elastic support plate at equal intervals, and the lifting groove and the elastic support plate form a semi-surrounding structure.

Compared with the prior art, the invention provides a clamping structure, which has the following beneficial effects:

1. according to the feeding mechanism, the feeding plate can move left and right under the action of the feeding screw rod, so that the clamping and pressing mechanism on the feeding plate is driven, the plate is driven to move transversely, automatic feeding work is synchronously performed in the clamping process, the efficiency can be greatly improved, meanwhile, in order to enable the plate to be fed more quickly, the feeding mechanism is also provided with the auxiliary feeding wheel on the clamping and feeding plate in an auxiliary mode, and in the plate moving process, the auxiliary feeding wheel can rotate in the rolling groove, so that the friction between the plate and the clamping and feeding plate is reduced, and the feeding efficiency is improved;

2. the elastic supporting plate in the lifting groove can elastically support the plate, and the plate can be clamped by matching the upward supporting force of the supporting elastic piece and the pressing plate in the process of pressing and clamping the plate, and plays a certain role in buffering and protecting, so that the pressing damage to the plate due to overlarge acting force of the pressing plate is avoided;

3. according to the invention, the driving mechanism can drive the internal transmission sector gear to rotate under the action of the stepping motor, so that the driving connecting rod rotates at the tail end of the rotating rod, the driving connecting rod synchronously drives the limiting gear to rotate in a way of matching with the angle of the driving connecting rod, and the distance between the lower pressing block and the shell of the driving box is adjusted, so that the plate can be clamped, and the self-adaptive adjustment can be carried out according to the size of the plate, so that the use is more convenient;

4. according to the invention, the pressure between the compression plate and the plate can be monitored in real time through the arranged pressure sensor, the pressure value is transmitted to the PLC, the PLC can automatically adjust the pressure value according to the plate material, the infrared distance sensor can monitor the initial distance between the compression plate and the plate in real time, the descending distance of the compression plate is pre-judged through the initial distance, the phenomenon that the pressure is too high and the plate is crushed due to too high descending speed of the compression plate is avoided, the pressure sensor and the infrared distance sensor are matched for use, and the automation degree of the clamping mechanism can be greatly improved.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the internal structure of the driving mechanism of the present invention;

FIG. 3 is a schematic view of the construction of the lifting tank of the present invention;

FIG. 4 is an enlarged schematic view of the structure at A in FIG. 1 according to the present invention;

FIG. 5 is an enlarged view of the structure at B in FIG. 2 according to the present invention;

FIG. 6 is a schematic diagram of the working process of the present invention.

In the figure: 1. a clamping mechanism base plate; 2. a limiting slide rail; 3. a feed plate; 4. a limiting slide block; 5. a PLC controller; 6. a lifting groove; 7. a support elastic member; 8. an elastic support plate; 9. a guide slider; 10. a guide groove; 11. pressing the block; 12. a drive link; 13. a stepping motor; 14. a limiting rod; 15. a drive cartridge housing; 16. clamping the support frame; 17. clamping the feeding plate; 18. auxiliary feed wheels; 19. a transmission sector gear; 20. rotating the rod; 21. a limit gear; 22. a compression plate; 23. a clamping head; 24. an infrared distance sensor; 25. a feed screw rod; 26. a rolling groove; 27. a telescopic rod; 28. a pressure sensor; 29. compressing the elastic block; 30. a buffer spring; 31. a telescopic sleeve; 32. lead screw motor.

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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Embodiment 1

As shown in fig. 1 and fig. 4, the present invention provides a technical solution: a clamping structure comprises a clamping mechanism bottom plate 1, a feeding mechanism and clamping support frames 16, wherein the feeding mechanism is positioned above the clamping mechanism bottom plate 1;

the left side and the right side of the feeding mechanism are provided with lifting grooves 6, supporting elastic parts 7 are installed above the lifting grooves 6, one ends of the supporting elastic parts 7 are connected with elastic supporting plates 8, guide grooves 10 are formed in the joints of the lifting grooves 6 and the elastic supporting plates 8, guide sliders 9 are arranged inside the guide grooves 10, the elastic supporting plates 8 are connected with the lifting grooves 6 through the guide grooves 10, the guide sliders 9 achieve sliding movement on the lifting grooves 6, the elastic supporting plates 8 form telescopic structures with the lifting grooves 6 through the supporting elastic parts 7, the supporting elastic parts 7 are evenly distributed along the end faces of the elastic supporting plates 8 at equal intervals, the lifting grooves 6 and the elastic supporting plates 8 form semi-enclosed structures, clamping supporting frames 16 are fixed to the front side and the rear side of the feeding mechanism, the elastic supporting plates 8 move downwards and compress the supporting elastic parts 7, the supporting elastic parts 7 generate upward supporting force and are matched with pressing plates 22 to clamp the plate, the plate can be processed as required, one side of the clamping supporting frames 16 is provided with a driving mechanism, and a pressing mechanism is arranged below the driving mechanism.

Example two

The scheme in the first embodiment is further described in the following with reference to specific working modes, which are described in detail in the following:

as shown in fig. 1, 3 and 6, as a preferred embodiment, on the basis of the above-mentioned manner, further, the feeding mechanism includes a feeding plate 3, a feeding screw 25 is disposed inside the feeding plate 3, one end of the feeding screw 25 is connected to a screw motor 32, a clamping feed plate 17 is disposed above the feeding plate 3, a limit slide rail 2 is mounted at a joint of the clamping mechanism bottom plate 1 and the feeding plate 3, a limit slide block 4 is disposed inside the limit slide rail 2, the feeding plate 3 performs sliding movement on the clamping mechanism bottom plate 1 through the limit slide rail 2 and the limit slide block 4, the feeding mechanism further includes a rolling groove 26, the rolling groove 26 is opened at an upper end surface of the clamping feed plate 17, an auxiliary feeding wheel 18 is disposed inside the rolling groove 26, the auxiliary feeding wheel 18 performs rotation inside the rolling groove 26, the upper end surface of the auxiliary feeding wheel 18 is higher than an upper end surface of the clamping feed plate 17, the feeding plate 3 performs transverse movement on the feeding plate 25 through a screw sleeve, the feeding plate 3 and the clamping feed plate 17 are parallel to each other, and the feeding plate 3 and the feeding plate is connected to a PLC drive a feeding motor to perform a work, and a plate support frame 16 is connected to perform a work, the PLC drive operation of the feeding motor, and the feeding plate 16.

As shown in fig. 2, as a preferred embodiment, on the basis of the above-mentioned manner, further, the driving mechanism includes a driving box housing 15, a limiting rod 14 is connected inside the driving box housing 15, a rotating rod 20 is installed below the limiting rod 14, one end of the rotating rod 20 is connected with a transmission sector gear 19, the other end of the rotating rod 20 is connected with the driving link 12, and the other end of the driving link 12 is connected with a limiting gear 21, a stepping motor 13 is installed at an input end of the transmission sector gear 19, the limiting rod 14 is symmetrically arranged about a vertical center of the driving box housing 15, the two sets of transmission sector gears 19 are meshed with each other, and the transmission sector gear 19, the rotating rod 20, the driving link 12 and the limiting gear 21 are mutually pinned with each other, the two sets of limiting gears 21 are meshed with each other, the stepping motor 13 drives the transmission sector gear 19 to rotate, the transmission sector gear 19 drives the rotating rod 20 to rotate, the driving link 12 rotates on one side of the rotating rod 20, and drives the limiting gear 21 to synchronously rotate, the distance between the limiting gear 21 and the driving sector gear 19 changes, and in the distance between the driving link 20 and the driving sector gear 19 gradually increases between the driving link 12 and the driving block 15 and the driving block 20.

As shown in fig. 5 and 6, as a preferred embodiment, on the basis of the above-mentioned manner, further, the pressing mechanism includes a pressing block 11, a pressing plate 22 is disposed below the pressing block 11, and an infrared distance sensor 24 is disposed at the middle portion below the pressing plate 22, a limit gear 21 is connected to the pressing block 11, a driving box housing 15 is connected to a driving sector gear 19, and the driving sector gear 19 is connected to a stepping motor 13, and the pressing block 11 is connected to the driving box housing 15 through the driving sector gear 19, a rotating rod 20, a driving link 12, and the limit gear 21, and the pressing mechanism further includes holding heads 23 disposed at the left and right sides of the infrared distance sensor 24, a telescopic sleeve 31 is disposed inside the holding head 23, a buffer spring 27 is disposed inside the telescopic sleeve 31, and a buffer spring 30 is sleeved on the surface of the telescopic sleeve 31, a pressing elastic block 29 is disposed below the telescopic sleeve 27, and pressure sensors 28 are disposed at the left and right sides of the pressing elastic block 29, an output end of the pressure sensor 28 is connected to a PLC controller 5, the stepping motor 13 and the stepping motor 29 are electrically connected to the PLC controller, and the PLC 23, and the pressing block 29 is electrically connected to the PLC controller 23, and the PLC controller controls the distance between the pressing block 23 and the infrared distance sensor 23, the compression elastic block 29 extrudes the buffer spring 30 inwards, the telescopic rod 27 enters the telescopic sleeve 31 until the pressure sensor 28 and the plate are attached to each other, the pressure sensor 28 monitors the pressure between the compression plate 22 and the plate in real time and transmits a pressure value to the PLC 5, and the PLC 5 automatically adjusts the pressure value according to the plate material; and finally, when the pressure value reaches a preset range, the PLC 5 controls the stepping motor 13 to be closed.

In summary, the following can be found:

the invention aims at the technical problems that: when plates are machined by the conventional clamping structures, in order to improve the machining automation efficiency, the plates need to be pushed by a pushing mechanism during machining, some plates need to be transferred to subsequent machining steps, some plates need to be moved to a proper machining position, the plates need to be loosened by the clamping structures firstly, and then the plates can be pushed, so that the problem that the plate pushing process can be carried out while the plate clamping state is not convenient to maintain is solved; the technical scheme of each embodiment is adopted. Meanwhile, the implementation process of the technical scheme is as follows:

directly placing the plates on two groups of lifting grooves 6, monitoring the initial distance between a pressing plate 22 and the plates in real time by an infrared distance sensor 24, transmitting data to a PLC (programmable logic controller) 5, prejudging the descending distance of the pressing plate 22 according to the initial distance by the PLC 5 at the moment, controlling a stepping motor 13 to start, driving a transmission sector gear 19 to rotate, driving the transmission sector gear 19 to drive a rotating rod 20 to rotate, driving a connecting rod 12 to rotate on one side of the rotating rod 20 and drive a limiting gear 21 to synchronously rotate, changing the distance between the limiting gear 21 and the transmission sector gear 19, limiting a limiting rod 14 in the rotating process of the transmission sector gear 19 to prevent the rotating rod 20 from rotating upwards, pressing an elastic block 29 inwards to press a buffer spring 30 as clamping grooves are formed in the left side and the right side of a lower pressing block 11 and a driving box shell 15, enabling the rotating rod 20 and the driving connecting rod 12 to freely rotate respectively, enabling a clamping head 23 to gradually approach the plates along with the increase of the distance between the limiting gear 21 and the transmission sector gear 19, then, controlling the pressure of the pressing elastic block 29 and the plate 27 to enter a telescopic sleeve 27 until the pressure sensor is pressed against the PLC 5, and the pressure sensor to control the PLC 5, and controlling the pressure of the PLC 5 in real-to be automatically according to the pressure of the PLC 5; finally, when the pressure value reaches a preset range, the PLC 5 controls the stepping motor 13 to be turned off, the elastic support plate 8 moves downwards and compresses the support elastic part 7, the support elastic part 7 generates an upward support force and is matched with the pressing plate 22 to clamp the plate, the plate can be processed as required, after the plate is processed, the PLC 5 drives the screw rod motor 32 to work, the screw rod motor 32 drives the feed screw rod 25 to rotate, the feed plate 3 moves left and right under the action of the screw rod sleeve and synchronously drives the clamping support frame 16 to move, so that the plate slides on the auxiliary feed wheel 18, and the feeding work of the plate is completed;

through above-mentioned setting, above-mentioned technical problem can be solved certainly to this application, simultaneously, realizes following technological effect:

according to the feeding mechanism, the feeding plate 3 can move left and right under the action of the feeding screw rod 25, so that the clamping and pressing mechanism on the feeding plate 3 is driven, the plate is driven to move transversely, automatic feeding work is synchronously performed in the clamping process, the efficiency can be greatly improved, meanwhile, in order to enable the plate to be fed more quickly, the feeding mechanism is provided with the auxiliary feeding wheel 18 on the clamping and feeding plate 17 in an auxiliary mode, in the plate moving process, the auxiliary feeding wheel 18 can rotate in the rolling groove 26, friction between the plate and the clamping and feeding plate 17 is reduced, and the feeding efficiency is improved;

according to the invention, the elastic supporting plate 8 arranged in the lifting groove 6 can elastically support a plate, and in the process of pressing and clamping the plate, the plate can be clamped by the upward supporting force of the supporting elastic part 7 and the pressing plate 22 in a mutual matching manner, and a certain buffer protection effect is achieved, so that the pressing damage to the plate caused by overlarge acting force of the pressing plate 22 is avoided;

according to the invention, the driving mechanism is arranged, the internal transmission sector gear 19 can be driven to rotate under the action of the stepping motor 13, so that the driving connecting rod 12 rotates at the tail end of the rotating rod 20, the driving connecting rod 12 synchronously drives the limiting gear 21 to rotate in a manner of matching with the angle of the driving connecting rod 12, and the distance between the lower pressing block 11 and the driving box shell 15 is adjusted, so that the clamping work of a plate can be completed, and the clamping structure can be adaptively adjusted according to the size of the plate, so that the use is more convenient;

the PLC 5 can automatically adjust the pressure value according to the plate material, the infrared distance sensor 24 can monitor the initial distance between the pressing plate 22 and the plate material in real time, the descending distance of the pressing plate 22 is pre-judged through the initial distance, the phenomenon that the plate material is crushed due to overlarge pressure caused by the fact that the pressing plate 22 descends at an overlarge speed is avoided, the pressure sensor 28 and the infrared distance sensor 24 are matched for use, and the automation degree of the clamping mechanism can be greatly improved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The clamping structure is characterized by comprising a clamping mechanism bottom plate (1), a feeding mechanism and clamping support frames (16), wherein the feeding mechanism is positioned above the clamping mechanism bottom plate (1), and the clamping support frames are arranged on the front side and the rear side of the feeding mechanism;

the left and right sides of feeding mechanism all is provided with lift groove (6), support elastic component (7) are installed to the top in lift groove (6), the one end of supporting elastic component (7) is connected with elastic support board (8), guide way (10) have been seted up with the junction of elastic support board (8) in lift groove (6), the inside of guide way (10) is provided with guide slider (9), both sides all are fixed with centre gripping support frame (16) around the feeding mechanism, one side of centre gripping support frame (16) is provided with actuating mechanism, and actuating mechanism's below is provided with down the mechanism.

2. The clamping structure according to claim 1, wherein the feeding mechanism comprises a feeding plate (3), a feeding screw rod (25) is arranged inside the feeding plate (3), one end of the feeding screw rod (25) is connected with a screw rod motor (32), a clamping feeding plate (17) is arranged above the feeding plate (3), a limiting slide rail (2) is arranged at the joint of the clamping mechanism bottom plate (1) and the feeding plate (3), a limiting slide block (4) is arranged inside the limiting slide rail (2), and the feeding plate (3) can realize sliding movement on the clamping mechanism bottom plate (1) through the limiting slide rail (2) and the limiting slide block (4).

3. A holding structure as claimed in claim 2, wherein the feed mechanism further comprises a rolling groove (26), the rolling groove (26) is opened on the upper end surface of the holding feeding plate (17), an auxiliary feed wheel (18) is arranged inside the rolling groove (26), the auxiliary feed wheel (18) rotates in the rolling groove (26), and the upper end surface of the auxiliary feed wheel (18) is higher than the upper end surface of the holding feeding plate (17).

4. A clamping arrangement according to claim 2, characterised in that the feed plate (3) is displaced laterally on the feed screw (25) by means of a screw sleeve, that the feed plate (3) and the clamping feed plate (17) are parallel to each other, and that the feed plate (3) and the clamping feed plate (17) are movably connected.

5. A clamping structure as claimed in claim 1, characterized in that the driving mechanism comprises a driving box housing (15), the driving box housing (15) is internally connected with a limiting rod (14), a rotating rod (20) is installed below the limiting rod (14), one end of the rotating rod (20) is connected with a transmission sector gear (19), the other end of the rotating rod (20) is connected with a driving connecting rod (12), the other end of the driving connecting rod (12) is connected with a limiting gear (21), and the input end of the transmission sector gear (19) is provided with a stepping motor (13).

6. A clamping arrangement according to claim 5, characterised in that the limiting levers (14) are arranged symmetrically with respect to the vertical centre of the drive cassette housing (15), that two sets of said transmission sector gears (19) are in engagement with each other, that two sets of said transmission sector gears (19), rotation levers (20), drive links (12) and limiting gears (21) are in pin joint with each other, and that two sets of said limiting gears (21) are in engagement with each other.

7. A clamping structure as claimed in claim 5, characterized in that the pressing mechanism comprises a pressing block (11), a pressing plate (22) is arranged below the pressing block (11), an infrared distance sensor (24) is arranged in the middle of the lower portion of the pressing plate (22), the limiting gear (21) is in key connection with the pressing block (11), the driving box shell (15) is in key connection with the transmission sector gear (19), the transmission sector gear (19) is in key connection with the stepping motor (13), and the pressing block (11) is lifted and lowered on the driving box shell (15) through the transmission sector gear (19), the rotary rod (20), the driving connecting rod (12) and the limiting gear (21).

8. The clamping structure of claim 7, wherein the pressing mechanism further comprises clamping heads (23) arranged on the left side and the right side of the infrared distance sensor (24), telescopic sleeves (31) are arranged inside the clamping heads (23), telescopic rods (27) are arranged inside the telescopic sleeves (31), buffer springs (30) are sleeved on the surfaces of the telescopic sleeves (31), elastic blocks (29) are installed below the telescopic rods (27) and are tightly pressed, pressure sensors (28) are arranged on the left side and the right side of each elastic block (29), the output ends of the pressure sensors (28) are connected with the PLC (5), the stepping motor (13) and the lead screw motor (32) are electrically connected with the PLC (5), and the pressure sensors (28) and the infrared distance sensor (24) are electrically connected with the PLC (5).

9. A clamping structure as claimed in claim 8, characterized in that the telescopic rod (27) and the telescopic sleeve (31) form a telescopic structure, the compression elastic block (29) forms a telescopic structure with the clamping head (23) through the buffer spring (30), the telescopic rod (27), the telescopic sleeve (31) and the clamping head (23), and the compression elastic block (29) penetrates through the clamping head (23).

10. A clamping structure as claimed in claim 1, characterized in that the resilient support plate (8) is slidably movable on the lifting groove (6) via the guide groove (10) and the guide slider (9), and the resilient support plate (8) is formed in a telescopic structure with the lifting groove (6) via the support resilient member (7), and the support resilient member (7) is equally spaced along the end surface of the resilient support plate (8), while the lifting groove (6) and the resilient support plate (8) are formed in a semi-enclosed structure.