CN113118553A

CN113118553A - Band sawing machine

Info

Publication number: CN113118553A
Application number: CN202110367761.0A
Authority: CN
Inventors: 毛军财; 褚俊杰; 陈金春; 吴忠兴
Original assignee: Hangzhou Chenlong Intelligent Technology Co ltd
Current assignee: Hangzhou Chenlong Intelligent Technology Co ltd
Priority date: 2021-04-06
Filing date: 2021-04-06
Publication date: 2021-07-16

Abstract

The utility model relates to a band sawing machine, including frame (101), be equipped with on frame (101) and be used for the transmission and bear conveying platform (301) of raw materials spare, be used for the drive conveying platform's (301) drive arrangement and a plurality of being used for the cutting conveying platform (301) go up raw materials spare saw cut device (200), each saw cut device (200) all movably setting up on frame (101), still include locking device, so that saw cut device (200) and lock when moving to operating position saw cut device (200). Like this, because finished product spare length, the quantity that single raw and other materials need saw cut are different, consequently saw cut the in-process, can carry out nimble combination to a plurality of devices of saw cutting according to actual demand, through the nimble group row to the use quantity, removal and the precedence of work of saw cutting the device to satisfy the saw cutting demand under the different operating mode. Through the cooperation of a plurality of saw cutting devices, can accomplish the saw cutting work of the raw materials spare of the different length of multistage simultaneously, improve and saw cut efficiency.

Description

Band sawing machine

Technical Field

The disclosure relates to the technical field of sawing machine cutting, in particular to a band sawing machine.

Background

A sawing machine is a machine tool that cuts a material to be cut using a saw band or the like as a tool. Traditional band sawing machine is when sawing the operation, and is fixed with the band sawing machine usually, through setting for different fixed length transport distance to realize the work of sawing of different length finished product spare, efficiency is lower, and the finished product spare length that the single saw cut is single.

Disclosure of Invention

The utility model aims at providing a band sawing machine, this band sawing machine can solve traditional band sawing machine and saw cut the problem that can't realize different length finished product unloading simultaneously, and inefficiency because of the single use leads to.

In order to achieve the above purpose, the present disclosure provides a band sawing machine, which includes a frame, wherein the frame is provided with a conveying table for conveying and bearing a material piece, a driving device for driving the conveying table, and a plurality of sawing devices for cutting the material piece on the conveying table, and each sawing device is movably arranged on the frame, and the band sawing machine further includes a locking device for locking the sawing device when the sawing device moves to a working position.

Optionally, the sawing device comprises a sliding table movably mounted on the frame and a saw belt arranged on the sliding table in a lifting manner, and the sliding table is further provided with a first motor for driving the sliding table to move and a first pressing clamp for fixing the raw material piece.

Optionally, a second pressing jaw is slidably disposed on the machine frame, and the plurality of sawing devices are located at a front end of the second pressing jaw, so that the second pressing jaw fixes a tail end of the raw material.

Optionally, V-shaped grooves are formed on the conveying table, the first pressing jaw and the second pressing jaw respectively to accommodate the raw material, and the V-shaped grooves of the first pressing jaw and the second pressing jaw are arranged opposite to the V-shaped grooves of the conveying table respectively and aligned with the center of the V-shaped grooves.

Optionally, a bottom plate is fixedly arranged on the frame and at the head end of the conveying table, a baffle is slidably arranged on the bottom plate along the vertical direction, and the conveying table further comprises a first cylinder for driving the baffle to move up and down.

Optionally, the driving device includes a second motor, and a driving wheel assembly and a driven wheel assembly respectively located at the head end and the tail end of the conveying table and in transmission connection, a carrier roller is disposed between the conveying table and the baffle plate, and the carrier roller is in transmission connection with the driving wheel assembly.

Optionally, the first pressing pliers are connected with a vertically arranged push plate capable of horizontally moving along the width direction of the conveying table and used for pushing down a material tail formed after the raw material piece is sawed, the first pressing pliers further comprise a second air cylinder used for driving the push plate to horizontally move, and a collecting basket used for receiving the material tail is arranged on one side of the conveying table.

Optionally, in the frame, be located the below of collecting basket is equipped with scraper blade chip removal machine, in the frame, be located scraper blade chip removal machine with be connected with the drainage plate between the collecting basket, the drainage plate to scraper blade chip removal machine slope.

Optionally, the feeding device further comprises a feeding detection sensor, a raw material part speed reduction sensor and a stub bar in-place sensor, which are respectively electrically connected with the driving device and used for detecting the position of the raw material part, wherein the feeding detection sensor is arranged on the driven wheel component, and the raw material part speed reduction sensor and the stub bar in-place sensor are sequentially arranged on the driving wheel component along the feeding direction.

Optionally, the rack is provided with a plurality of origin sensors and a plurality of limit sensors, the origin sensors are used for detecting positions of the sawing devices, the origin sensors correspond to the sawing devices and the second pressing tongs respectively, and the limit sensors are used for forward overshoot protection of the sawing devices, backward overshoot protection of the second pressing tongs and collision avoidance between the sawing devices respectively at the head end of the conveying table.

Through above-mentioned technical scheme, because finished product spare length, the quantity that single raw and other materials need saw cut are different, consequently saw cut the in-process, can carry out nimble combination to a plurality of devices of saw cutting according to actual demand, through the nimble group row to the use quantity, the removal of saw cutting the device and the precedence of work to satisfy the saw cutting demand under the different operating modes. Through the cooperation of a plurality of saw cutting devices, the saw cutting work of the raw material piece with any length in the design range can be completed, and the saw cutting efficiency is improved.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic view of a band saw machine according to an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic view of a frame of a band saw machine according to an exemplary embodiment of the present disclosure;

FIG. 3 is a schematic structural view of a sawing device in a band sawing machine according to an exemplary embodiment of the present disclosure;

FIG. 4 is a schematic view of a conveyor table and a drive assembly in a band saw machine according to an exemplary embodiment of the present disclosure;

FIG. 5 is a schematic view of a second clamping jaw of a band saw machine according to an exemplary embodiment of the present disclosure;

FIG. 6 is a schematic view of a baffle in a band saw machine according to an exemplary embodiment of the present disclosure;

FIG. 7 is a schematic view of a push plate in a band saw machine according to an exemplary embodiment of the present disclosure;

FIG. 8 is a schematic view of another angle of the band saw machine according to an exemplary embodiment of the present disclosure.

Description of the reference numerals

101 rack 102 linear guide

103 rack 104 locking rail

105 collecting basket 106 drainage plate

200 saw cut device 201 slip table

202 saw band 203 first motor

204 first press clamp 205 locking oil cylinder

301 conveying table 302 second motor

303 drive wheel assembly 304 driven wheel assembly

400 second press jaw 501 bottom plate

502 baffle 503 first cylinder

600 bearing roller 701 base

702 push plate 703 second cylinder

800 scrape board-like chip removal machine 901 feeding detection sensor

902 raw material part speed reduction sensor 903 stub bar in-place sensor

904 origin sensor 905 limit sensor

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

Unless stated to the contrary, terms of orientation used in the present disclosure such as "upper", "lower", "front", "rear" generally refer to those defined in the context of normal installation of the band saw machine provided by the present disclosure. Furthermore, the terms "first," "second," and the like, as used in this disclosure, are intended to distinguish one element from another, and not necessarily for order or importance. In the present disclosure, when the following description refers to the accompanying drawings, the same numbers in different drawings represent the same or similar elements, unless otherwise indicated.

Referring to fig. 1 to 8, the present disclosure provides a band sawing machine, which includes a frame 101, a conveying table 301 for conveying and carrying raw material pieces, a driving device for driving the conveying table 301, and a plurality of sawing devices 200 for cutting the raw material pieces on the conveying table 301, wherein each sawing device 200 is movably disposed on the frame 101, and a locking device for locking the sawing devices 200 when the sawing devices 200 are moved to a working position. Wherein, locking device can include the locking track 104 that sets up on frame 101 along the length direction of frame 101 and with saw cutting device 200 fixed connection's locking hydro-cylinder 205, the piston rod of locking hydro-cylinder 205 stretches into locking track 104, and with locking track 104 looks joint, after saw cutting device 200 moved in place, locking hydro-cylinder 205 withdraws the piston rod, locks with locking track 104 to it is fixed with saw cutting device 200, prevents to saw cut in-process saw cutting device 200 drunkenness, leads to saw cutting length inaccurate. Further, the raw material piece may be a round tube or a round rod. Here, it should be noted that a plurality of sawing devices 200 may be disposed on the frame 101, and the present disclosure will describe the structure of the band sawing machine in detail by taking three sawing devices 200 disposed on the frame 101 as an example, as shown in fig. 1, a sawing device 200a, a sawing device 200b, and a sawing device 200c are disposed on the frame 101 in sequence along a feeding direction, an arrow direction in fig. 1 is a feeding direction, and an arrow point points from a rear direction (tail end) to a front direction (head end).

Through the technical scheme, because finished product spare length, the quantity that single raw and other materials need saw cut are different, consequently saw cut the in-process, can saw cut device 200a, saw cut device 200b and saw cut device 200c and carry out nimble combination according to actual demand, through the nimble group row of the precedence order of use quantity, removal and the work of saw cutting device 200 to satisfy the saw cutting demand under the different operating modes. Through the cooperation of a plurality of saw cutting devices 200, can accomplish the saw cutting work of the raw materials spare of multistage different length simultaneously, improve and saw cut efficiency.

The sawing device 200 may be constructed in various forms. In the embodiment of the present disclosure, referring to fig. 3 and 4, the sawing device 200 may include a sliding table 201 movably mounted on the frame 101, and a saw belt 202 liftable on the sliding table 201, wherein the sliding table 201 is further provided with a first motor 203 for driving the sliding table 201 to move and a first pressing clamp 204 for fixing a raw material. Saw cut device 200 and be used for the fixed length saw cutting of single raw materials spare, saw cut device 200a, saw cut device 200b, and saw cut device 200c and fix in proper order on the linear guide 102 of frame 101, still be provided with rack 103 along its length direction on the frame 101, install the gear on the output shaft of first motor 203, the gear meshes with rack 103 mutually, install first motor 203 on slip table 201 and can saw cut device 200 accurate removal to required position according to saw cutting the requirement, realize the fixed length saw cutting of different length finished products spare. Meanwhile, after the sawing device 200 is moved, the first pressing pliers 204 press down to fix the raw material piece, so that the raw material piece is prevented from shifting to influence the sawing precision during sawing.

Further, referring to fig. 1 and 5, a second pressing jaw 400 is slidably disposed on the frame 101, and the plurality of sawing devices 200 are disposed at a front end of the second pressing jaw 400, so that the second pressing jaw 400 fixes a tail end of the raw material piece during sawing of the short finished product piece. The second press jaw 400 is fixed to the linear guide 102 at the rear end of the sawing device 200 c. After sawing the short finished product, if there is longer surplus, need continue to saw, for guaranteeing that surplus raw materials spare position is unchangeable when sawing device 200 and seeking a position again, because first pressing tongs 204 withdraws this moment, can't fix surplus raw materials spare, need fix raw materials spare at the tail end in advance through second pressing tongs 400, prevent raw materials spare offset, guarantee to saw cut the accuracy of length.

Specifically, referring to fig. 1, 3 and 5, V-shaped grooves may be formed on the conveying table 301, the first pressing jaw 204 and the second pressing jaw 400, respectively, to receive the raw material, and the V-shaped grooves of the first pressing jaw 204 and the second pressing jaw 400 are disposed opposite to the V-shaped grooves of the conveying table 301, respectively, and are aligned at the center thereof. The conveying platform 301 may be a chain plate, the center position of the V-shaped groove of the chain plate is aligned with the center positions of the V-shaped grooves of the first pressing jaw 204 and the second pressing jaw 400, and the position of the raw material is fixed by the V-shaped grooves arranged oppositely. It should be noted that, the conveying table 301, the first pressing jaw 204, and the second pressing jaw 400 may also be formed with grooves having other shapes, such as U-shaped grooves, which are not specifically limited herein, and may be implemented to accommodate raw material pieces, and all of which belong to the protection scope of the present disclosure.

As an exemplary embodiment of the present disclosure, referring to fig. 6, a bottom plate 501 may be fixedly disposed on the frame 101 at a head end of the conveying table 301, a baffle 502 may be slidably disposed on the bottom plate 501 along a vertical direction, and the band sawing machine further includes a first cylinder 503 for driving the baffle 502 to move up and down. The baffle 502 is used for blocking and positioning the stub bar of the raw material part, and is used as a stub bar sawing zero position reference to ensure that the length of the stub bar is in a reasonable range. Specifically, the bottom plate 501 may be welded to the frame 101.

The drive means may be constructed in a number of ways. In the embodiment of the present disclosure, referring to fig. 4, the driving device may include a second motor 302, and a driving wheel assembly 303 and a driven wheel assembly 304 respectively located at the head end and the tail end of the conveying table 301 and in transmission connection, an idler 600 is disposed between the conveying table 301 and the baffle 502, the idler 600 is connected with the bottom plate 501 through a bracket, and the idler 600 is rotatably disposed on the bracket for auxiliary discharging of a shorter length of finished product.

According to some embodiments, referring to fig. 7, the first pressing jaw 204 is connected with a push plate 702 which is vertically arranged and can horizontally move along the width direction of the conveying table 301, and is used for pushing off the material tail formed after the material piece is sawn, the second pressing jaw further comprises a second air cylinder 703 for driving the push plate 702 to horizontally move, and one side of the conveying table 301 is provided with a collecting basket 105 for receiving the material tail. In the embodiment of the present disclosure, there are two push plates 702, which are respectively mounted on the first pressing pliers 204 of the

sawing devices

200b and 200c through the base 701, and the push plates 702 are selected according to actual situations. Because the distance between the saw band 202 and the front end of the push plate 702 is a fixed value, which is recorded as L, after the material tail is sawed, the sawing device 200 moves forward by the fixed value L, at this time, the front end of the push plate 702 is aligned with the material tail, the second cylinder 703 drives the push plate 702 to extend out, the material tail is pushed down to the collecting basket 105, and the material tail is collected and cleaned regularly by manpower.

Specifically, referring to fig. 1 and 2, a scraper-type chip remover 800 may be disposed on the frame 101 and below the collecting basket 105 for collecting and processing scrap iron and cutting fluid. And a drainage plate 106 is connected to the rack 101 and positioned between the scraper chip removal machine 800 and the collecting basket 105, and the drainage plate 106 inclines towards the scraper chip removal machine 800. After the sawing device 200 finishes the stub bar sawing, the baffle 502 descends, the stub bar falls onto the drainage plate 106 along the gap between the baffle 502 and the carrier roller 600, and then falls onto the scraper type chip removal machine 800 along the inclined drainage plate 106, and is cleaned periodically by manual work.

Further, referring to fig. 8, the band sawing machine may further include a feeding detection sensor 901, a raw material deceleration sensor 902, and a stub bar in-place sensor 903 electrically connected to the driving device, respectively, for detecting a position of the raw material, where the feeding detection sensor 901 is disposed on the driven wheel assembly 304, and the raw material deceleration sensor 902 and the stub bar in-place sensor 903 are sequentially disposed on the driving wheel assembly 303 along the feeding direction. The feeding detection sensor 901 is used for detecting incoming materials, the raw material piece head triggers the feeding detection sensor 901, the baffle 502 rises, and the driving device drives the conveying platform 301 to start to convey the raw materials forwards; after a period of time, the raw material head triggers the raw material deceleration sensor 902, the conveying table 301 starts to operate in a deceleration mode to reduce the impact of the raw material on the baffle 502, the conveying table 301 stops when the raw material head triggers the head in-place sensor 903, the raw material is conveyed in place, and the band sawing machine can start sawing operation.

Still further, referring to fig. 8, a plurality of origin sensors 904 and limit sensors 905 for detecting the positions of the sawing devices 200 may be disposed on the frame 101, the plurality of origin sensors 904 correspond to the respective sawing devices 200 and the second pressing pliers 400, respectively, and the plurality of limit sensors 905 are respectively used for front overshoot protection of the sawing devices 200 at the head end of the conveying table 301, rear overshoot protection of the second pressing pliers 400, and collision avoidance between the respective sawing devices 200. In the embodiment of the present disclosure, there are four origin sensors 904, which are 904a, 904b, 904c, and 904d, respectively, and correspond to the positioning origins of the

sawing devices

200a, 200b, 200c, and the second pressing clamp 400, respectively. The number of the limit sensors 905 is five, and the

limit sensors

905a, 905b, 905c, 905d and 905e are respectively 905a, 905b, 905c, 905d and 905e, wherein the limit sensor 905a is used for front overshoot protection of the sawing device 200a, the limit sensor 905b is used for rear overshoot protection of the second pressing pliers 400, and the

limit sensors

905c, 905d and 905e are used for collision protection among the sawing device 200a, the sawing device 200b, the sawing device 200c and the second pressing pliers 400.

The operation of the band saw machine will now be illustrated in several cases.

Initial state: the sawing

devices

200a, 200b, 200c and 400 are all located at their respective home positions.

Sawing into two sections of finished products: three cutters are needed for sawing two sections of finished products, and the sawing positions are marked as a, b and c in sequence. The sawing device 200a is kept still at the original point position, namely point a, and is locked and fixed by the locking oil cylinder 205; the

sawing devices

200b and 200c are driven by the first motor 203 according to the length of the finished product, and respectively move forwards or backwards for a corresponding distance from the original point position, namely reach the point b and the point c respectively, and are locked and fixed by the locking oil cylinder 205 after being in place. After the movement is finished, the three first pressing pincers 204 press downwards at the same time to fix the raw material piece, so that the raw material piece is prevented from deviating to influence the sawing precision during sawing; after the material pieces are completely fixed, the three sawing devices 200 start to work simultaneously, and the sawing work of the two sections of finished product pieces is completed.

Sawing into three sections of finished products: sawing three sections of finished pieces requires four knives, and the sawing positions are marked as a, b, c and d in sequence. The sawing device 200a is kept still at the original point position, namely point a, and is locked and fixed by the locking oil cylinder 205; the

sawing devices

200b and 200c are driven by the first motor 203 according to the length of the finished product, and respectively move forwards or backwards for a corresponding distance from the original point position, namely reach the point b and the point d respectively, and are locked and fixed by the locking oil cylinder 205 after being in place. After the movement is finished, the three first pressing pincers 204 press downwards at the same time to fix the raw material piece so as to prevent deviation during the sawing from influencing the sawing precision; after the material piece is completely fixed, the three sawing devices 200 start to work simultaneously, and the first sawing work is completed. The saw band 202 of the three sawing devices 200 is lifted, wherein the first pressing pliers 204 of the sawing device 200a and the sawing device 200b are still kept pressed down, the first pressing pliers 204 of the sawing device 200c is retracted, the sawing device 200c is moved to the point c, the first pressing pliers 204 is pressed down to fix the raw material piece, and the sawing device 200c starts to work to finish the second sawing work. And finishing the sawing work of the three sections of finished products.

Sawing into six sections of finished parts: sawing six sections of finished products requires seven cutters, and the sawing positions are marked as a, b, c, d, e, f and g in sequence. Saw cut device 200a, saw cut device 200b, saw cut device 200c and move the three saw cutting positions that saw cut the position to raw materials spare stub bar department respectively, a, b, c point promptly, carry out the saw cutting work of stub bar, first section finished product spare, second section finished product spare respectively, second press plier 400 moves to raw materials spare tail end, g point promptly, and second press plier 400 pushes down, fixes raw and other materials. After the three sawing devices 200 complete the first sawing operation, the three sawing devices move backwards at the same time and move to the positions d, e and f respectively, at the moment, the locking cylinders 205 of the sawing device 200a and the sawing device 200b lock and fix the three sawing devices, and the first pressing clamp 204 presses downwards to fix the raw material piece; the second pressing pliers 400 is lifted and moves backwards to the original point position, the second pressing pliers are separated from the raw material piece, the sawing device 200c continues to move to the point g, the locking oil cylinder 205 locks and fixes the sawing device, the first pressing pliers 204 presses downwards to fix the raw material piece, and the three sawing devices 200 start to work simultaneously to finish the second sawing work. The saw band 202 of the three sawing devices 200 is lifted, wherein the first pressing jaw 204 of the sawing device 200b is still kept pressed, the first pressing jaw 204 of the sawing device 200c is retracted, and the sawing device 200c moves to point f, at this time, the first pressing jaw 204 is pressed downwards to fix the raw material piece, and the sawing device 200c starts to work to complete the third sawing work. And finishing the sawing work of the six sections of finished products.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. The band sawing machine is characterized by comprising a machine frame (101), wherein a conveying table (301) used for conveying and bearing raw materials, a driving device used for driving the conveying table (301), and a plurality of sawing devices (200) used for cutting the raw materials on the conveying table (301) are arranged on the machine frame (101), and each sawing device (200) is movably arranged on the machine frame (101) and further comprises a locking device, so that the sawing devices (200) are locked when moved to a working position.

2. The band sawing machine according to claim 1, wherein the sawing device (200) comprises a sliding table (201) movably mounted on the frame (101) and a saw belt (202) arranged on the sliding table (201) in a lifting manner, and a first motor (203) for driving the sliding table (201) to move and a first pressing clamp (204) for fixing the raw material are further arranged on the sliding table (201).

3. The band sawing machine according to claim 2, characterized in that a second pressing jaw (400) is slidably arranged on the machine frame (101), and a plurality of sawing devices (200) are arranged at the front end of the second pressing jaw (400) so that the second pressing jaw (400) can fix the tail end of the raw material piece.

4. The band sawing machine according to claim 3, characterized in that the transport table (301), the first press jaw (204) and the second press jaw (400) are each formed with a V-shaped groove for receiving the material piece, and the V-shaped grooves of the first press jaw (204) and the second press jaw (400) are each disposed opposite to and aligned with the V-shaped groove of the transport table (301).

5. The band sawing machine according to claim 1, wherein a bottom plate (501) is fixedly arranged on the frame (101) and at the head end of the conveying table (301), a baffle plate (502) is slidably arranged on the bottom plate (501) along the vertical direction, and the band sawing machine further comprises a first cylinder (503) for driving the baffle plate (502) to move up and down.

6. The band sawing machine according to claim 5, characterized in that the driving device comprises a second motor (302) and a driving wheel assembly (303) and a driven wheel assembly (304) which are respectively arranged at the head end and the tail end of the conveying table (301) and are in transmission connection, and a supporting roller (600) is arranged between the conveying table (301) and the baffle plate (502).

7. The band sawing machine according to claim 2, wherein the first pressing jaw (204) is connected with a push plate (702) which is vertically arranged and can horizontally move along the width direction of the conveying table (301) and is used for pushing down the material tail formed after the material piece is sawn, the band sawing machine further comprises a second air cylinder (703) which is used for driving the push plate (702) to horizontally move, and a collecting basket (105) which is used for receiving the material tail is arranged on one side of the conveying table (301).

8. The band sawing machine according to claim 7, characterized in that a scraper chip remover (800) is arranged on the frame (101) and below the collecting basket (105), a drainage plate (106) is connected between the scraper chip remover (800) and the collecting basket (105) on the frame (101), and the drainage plate (106) inclines towards the scraper chip remover (800).

9. The band sawing machine according to claim 6, further comprising a feeding detection sensor (901), a material deceleration sensor (902) and a stub bar in-place sensor (903) electrically connected to the driving device respectively for detecting a position of the material, wherein the feeding detection sensor (901) is disposed on the driven wheel assembly (304), and the material deceleration sensor (902) and the stub bar in-place sensor (903) are sequentially disposed on the driving wheel assembly (303) along a feeding direction.

10. The band sawing machine according to claim 3, wherein a plurality of origin sensors (904) and limit sensors (905) for detecting positions of the sawing devices (200) are arranged on the machine frame (101), the origin sensors (904) correspond to the sawing devices (200) and the second pressing pliers (400), and the limit sensors (905) are used for forward overshoot protection of the sawing devices (200) at the head end of the conveying table (301), backward overshoot protection of the second pressing pliers (400) and collision avoidance between the sawing devices (200).