CN2792950Y

CN2792950Y - Strapping machine with feeding and unwinding belt tension device

Info

Publication number: CN2792950Y
Application number: CN 200520107809
Authority: CN
Inventors: 赖建发
Original assignee: Weihua Enterprise Co ltd
Current assignee: Weihua Enterprise Co ltd
Priority date: 2005-05-24
Filing date: 2005-05-24
Publication date: 2006-07-05
Anticipated expiration: 2015-05-24

Abstract

The utility model relates to a bundler with a belt feeding and withdrawing tension device, which comprises a machine body, a transmission part, a belt feeding and withdrawing part and a tensioning part, wherein the transmission part of the bundler is provided with a rotatable belt feeding and withdrawing cam and a tensioning cam, the belt feeding and retracting part comprises a belt feeding and retracting motor, a belt feeding and retracting driving wheel, a belt feeding and retracting connecting rod group and a belt feeding and retracting driven wheel connected with the belt feeding and retracting connecting rod group, the tensioning part also comprises a tensioning motor, a tensioning driving wheel, a tensioning connecting rod group and a tensioning driven wheel connected with the tensioning connecting rod group, the tensioning driven wheel is connected with the tensioning connecting rod group, when triggered by the tensioning cam, the tensioning driven wheel changes the relative relation with the tensioning driving wheel, controls the functions of loosening and clamping the bridle, reduces the horizontal space, and shortens the actuating time by the linkage driven by the cam.

Description

The banding machine of tool send-back tensioner

Technical field

The utility model be a kind of automatically or the S. A. mode send band, come the banding machine of harness, connection with wrapping of piece, especially refer to banding machine in order to the send-back of control band and the tension force of band, have level little, the characteristics such as the start reaction time short, band tension function is good that take up room.

Background technology

Banding machine is to send the band that plastic material is made, and makes it harness and is attached to article, reaches the purpose of packing.And general banding machine normally the band tension adjusting device be installed in guide mechanism, oppositely draw the length of putting band in order to control, adjust band degree of tightening, be to comprise one can rotate and the tension arm and of rotation displacement is arranged at that band on the tension arm inserts and puts mechanism, a may command band inserts and puts the eccentric adjustment that mechanism folds up band with the driving section main shaft in the past.And partly there is the situation of member complexity in for a change aforementioned band tension adjustment, one novel patent case proposes improvement project to this, this is that Chinese patent 01226741.4 is announced " the band tension adjusting device of banding machine " the utility model patent case [calling in the following text: with reference to case] on May 22nd, 2002.

With reference to case comprise one can insert and put that brake block that part, drives by CD-ROM drive motor, CD-ROM drive motor, that a controlled device starts rotating are arranged at transmission shaft with tension arm, a follower lever, an elastic element, the hinged arm, that driving cam rotates and in order to the touch part, that touches controller in order to link the delay start device of CD-ROM drive motor; During with drive motor, drive the displacement of brake block interlock follower lever, making its pushing tow insert and put part makes it clamp the band that passes, therefore band is tied package in advance, the proper rotation displacement of tension arm, and the touch part of transmission shaft while start-up control device, and the delay start device delays to start the time length of this CD-ROM drive motor, the tension force size that control is tightened.

Brought into play the adjustment function of band tension force size with reference to case, but still had several problems to need to change with reference to case.

1, tension arm links guide mechanism, because tension arm needs swing offset, admissible space for tension of engagement arm, guide mechanism swing offset together, increased the horizontal space of board, the horizontal space of board is put in the soil increase relatively, at the environment of an inch of land is an inch of gold now, shortcoming to some extent in the space utilization.

2, start is more time-consuming.When the conduction band chance retracts band and ties in advance, the resistance bull stick that transmission shaft rotates with the control tension arm is positioned at the gradually protruding transformation point of driving cam, first controller carries signal to give the delay start device, and tension arm produces rotation displacement, drive CD-ROM drive motor by the delay start device again according to the delay start time again, drive the dwang displacement to make CD-ROM drive motor drive brake block, order inserts and puts part and clamps band.Therefore the action of a succession of element have the reaction of sequencing, and tension arm has extended the start time together with the significantly swing displacement of guide mechanism.

3, the part that inserts and puts that is placed in tension arm is to be used for the cramping band and to locate, therefore insert and put part this end face at corresponding band, if the flank of tooth that forms is too sharp-pointed, then can damages band and cause the bale packing effect not firm, if profile of tooth passivation then to clamp effect bad and make the easy slippage of band.

4, aforementionedly insert and put the pivot that part is hubbed at tension arm one end and close in the groove, utilization inserts and puts the part end face and pivot closes the corresponding band that inserts and puts of groove inner end surface, therefore inserting and putting the horizontal requirement on machining accuracy that horizontal accuracy, pivot that part installs close groove all can be higher, otherwise insert and put part and pivot and close groove inner end surface distance, lack horizontal accuracy and present the situation that differs, to cause can't comprehensive ground cramping band, exists this to give birth to the misgivings of fraction defective easily so insert and put the processing of part, tension arm.

Summary of the invention

The utility model main purpose is to provide a kind of banding machine of tool send-back tensioner, mainly be the send-back portion of banding machine, in order to the tension portion of tension band, have the advantages that structure simplifies more, takies that horizontal space is little, the start reaction time is short and quick.

In order to reach aforesaid purpose, the technological means that the utility model used is to provide a kind of banding machine of tool send-back tensioner, and this banding machine has a body, a driving section, a send-back portion, a tension portion, wherein:

This driving section has a main shaft, and this main shaft is fixed the send-back cam of a corresponding send-back portion, the tension cam of a corresponding tension portion, and the raised position of this send-back cam and tension cam is to stagger;

This send-back portion comprises a send-back motor, a send-back driving wheel, a send-back flower wheel, a send-back linkage rod group, and the send-back linkage rod group comprises a send-back horizon bar, a send-back tension arm, the driven support arm of a send-back again; Wherein:

This send-back motor links and drives this send-back driving wheel to form rotation, this send-back horizon bar one end is hubbed at body rotationally, the other end contacts this send-back cam, and this send-back tension arm one end is arranged at the top of send-back horizon bar, the send-back spring of one tension-adjustable is installed between this send-back tension arm and this send-back horizon bar, this send-back tension arm other end articulates driven support arm one end of this send-back, this driven support arm other end end face is hubbed at wall body rotationally, this driven support arm keeps this adjacent send-back driving wheel in send-back flower wheel position to pinch band rotationally in conjunction with this send-back flower wheel;

This tension portion comprises a tension motor, a tension driving wheel, a tension flower wheel, a tension linkage group, and the tension linkage group comprises a tension horizon bar, a tensile arm, the driven support arm of a tension; Wherein:

This tension motor links and drives this tension driving wheel to form rotation, and this tension driven wheel one end is the gear mesh form, and the other end is then worn for band by two corresponding sides and put;

This tension horizon bar one end is hubbed at body rotationally, tension horizon bar one end in contact is on the tension cam, the other end is corresponding to this tensile arm one end, and the back-moving spring of a tension-adjustable is installed between this tensile arm and this tension horizon bar, this tensile arm other end articulates this and strains driven support arm one end, this driven support arm other end end face is to be hubbed at body rotationally, this tension flower wheel is strained on the driven support arm to be hubbed at this rotationally, keep adjacent this tension driving wheel in this tension flower wheel position, be connected a returning spring between this send-back horizon bar and this tension horizon bar.

Therefore according to technological means of the present utility model, the effect brief description that the utility model can obtain is as follows:

1, simple structure.The utility model is integrated the element of send-back portion, tension portion, makes both kenel major parts of send-back linkage rod group, tension linkage group corresponding, so cost-cutting is simplified in element manufacturing, structure kenel relatively.

2, tension portion there is no tension arm swing offset design in the past, but link the tension linkage group and be subjected to its interlock with the tension flower wheel, be the may command state with the position relation of tension driving wheel, tension portion separates with guide mechanism in addition, so the swing space is little, can significantly reduce the body level and take up room, save material cost, space cost, the traffic cost of a lot of body.

3, start is quick fast.The utility model is strained cam (or send-back cam) via tension linkage group (or send-back linkage rod group) and is touched, affect connecting rod effect immediately to driven support arm, make flower wheel (containing send-back flower wheel, tension flower wheel) produce displacement, therefore the flower wheel amplitude of fluctuation is little, relatedly reduced the start time, made the start reaction fast quick increasingly.

4, the tension driven wheel is that an end is the gear mesh kenel mutually, the other end beginning is for inserting and putting the band part, add that the tension flower wheel is to be linked to the tension linkage group, and be the free end shape, be not only the execution of tension linkage group so impose clamping strength, and application of force size can be exempted the restriction of tension flower wheel position, can guarantee to clamp band, exempts the undesirable element of the processing of flank of tooth cramping band generation in the past, bale packing effect.

5, back-moving spring, send-back spring can be adjusted, drive the driven support arm power of (comprising the driven support arm of tension, advance and retreat) with control tension arm (comprising tensile arm, advance and retreat belt tension arm) with driven support arm, adjust the tension force that driven wheel inserts and puts band, and be suitable all the time by the strength that band is guaranteed to clamp in elasticity adjustable force road.

Description of drawings

Fig. 1: be the utility model banding machine configured in one piece front plan view.

Fig. 2: be the block diagram of the utility model send-back tensioner.

Fig. 3: be the three-dimensional element exploded drawings of the utility model send-back portion.

Fig. 4: be the three-dimensional element exploded drawings of the utility model tension portion.

Fig. 5: the upper viewing view that inserts and puts band for the utility model send-back portion.

Fig. 6: for the utility model tension portion insert and put band on look partial section view.

Fig. 7: be the planar view of the utility model tension horizon bar, send-back horizon bar and cam relationship.

Fig. 8: the action plane figure that shows unthreading mode for the utility model.

Fig. 9: for the utility model shows the action plane figure of cam at unthreading mode.

Figure 10: the action plane figure that shows tension band state for the utility model.

Figure 11: for the utility model shows the action plane figure of cam at tension band state.

Drawing reference numeral:

10...... body 101...... wall body

11...... shelf group 12...... tep reel mechanism

13...... storage belting 131...... band storing device

14...... guide wheel group 15...... driving section

151...... go out to be with the rail tool on the main shaft 16......

17...... in go out to be with the rail tool

18...... proximity switch

20...... band

30...... the 31...... of send-back portion send-back motor

311...... send-back driving wheel

312...... send-back flower wheel

32...... send-back linkage rod group

33...... send-back horizon bar 331...... send-back sliding part

34...... send-back tension arm 341...... perforation

35...... the driven support arm of send-back

36...... send-back spring 37...... bolt

371...... nut

40...... send-back cam

42...... tension cam 44...... returning spring

50...... tension portion

51...... tension motor

511...... tension driving wheel 512...... is trough of belt initiatively

513...... tension flower wheel 514...... carries ring secretly

52...... tension linkage group

53...... tension horizon bar 531...... tension sliding part

54...... tensile arm 541...... perforation

55...... strain driven support arm

56...... back-moving spring 57...... bolt

571...... nut at the bottom of the nut 572......

The specific embodiment

The utility model is a kind of banding machine of tool send-back tensioner, please referring to Fig. 1, the banding machine basic configuration is to be provided with a shelf group 11 that is ㄇ shape at a body 10 tops, body 10 is positioned at the inside of shelf group 11, one driving section 15 then is set, one send-back portion 30, one tension portion 50, one guide wheel group 14, one tep reel mechanism 12, one storage belting 13, utilize tep reel mechanism 12 to send band 20, make it introduce storage belting 13 through guide wheel group 14, the band storing device 131 of storage belting 13 is introduced tension portion 50 again with band 20 exit end, send-back portion 30 enters the bale packing position in this preparation, shelf group 11.Characteristics of the present utility model are send-back portion 30 and tension portion 50, this two places mechanism is provided with driving and driven wheel body, utilize connecting rod mechanism collocation elastic force apparatus in conjunction with flower wheel, to control driving and driven clamping and to decontrol band, and send-back portion 30, tension portion 50 respectively are subjected to the cam interlock of driving section 15 by aforementioned linkage, therefore quicken the reception and registration speed of start reaction, functions such as the space is little, start quick, band 20 clamping effects are good are provided.

Please referring to Fig. 1, Fig. 2, body 10 is formed with the L-shaped wall body of section 101 in installation send-back portion 30, tension portion 50 positions, aforesaid send-back portion 30 is positioned at top, tension portion 50 is positioned at its underpart, and the main shaft 151 of driving section 15 is positioned at an example between the two relatively, and wall body 101 is provided with on send-back portion 30 tops (as Fig. 1 to Fig. 3) and goes out to be with rail tool 16 on one, go out to be with rail tool 17 in being between send-back portion 30, tension portion 50, go up, in go out to be with rail tool 16,17 corresponding involutory by two lamellar bodies, and surround the track of walking about for band 20 guiding for one betwixt;

Main shaft 151 coaxial two cams that are fixed with of this driving section 15 are respectively the tension cams 42 of the corresponding tension of send-back cam 40, a portion 50 of a corresponding send-back portion 30, and send-back cam 40 staggers with the crowning position of tension cam 42.

Please referring again to Fig. 1 to Fig. 3, this send-back portion 30 comprises a send-back motor 31, a send-back driving wheel 311, a send-back flower wheel 312, a send-back linkage rod group 32, and send-back linkage rod group 32 comprises a send-back horizon bar 33, the L-shaped driven support arm 35 of send-back of a send-back tension arm 34; Wherein:

This send-back motor 31 is fixed in wall body 101, form rotation in order to link and to drive this send-back driving wheel 311, and send-back flower wheel 312 is positioned at send-back driving wheel 311 adjacent sides, can pinch or press from both sides in order to both and move back band 20 (as Fig. 5), in addition, send-back horizon bar 33 1 ends of this send-back linkage rod group 32 are hubbed at wall body 101 rotationally, send-back horizon bar 33 other ends are installed rotating send-back sliding part 331 (being bearing shown in the figure), utilize send-back sliding part 331 to be contacted with on the send-back cam 40, this send-back tension arm 34 is tops that an end is arranged at send-back horizon bar 33 nearly middle positions, 33 send-back springs 36 that a tension-adjustable is installed of send-back tension arm 34 and send-back horizon bar, this installation kenel is that a bolt 37 is installed by send-back horizon bar 33, and on send-back horizon bar 33 two nuts 371 of screw lock, install this send-back spring 36 in bolt 37 again, the perforation 341 that send-back tension arm 34 should be held, make this send-back tension arm 34 in bolt 37, be subjected to shoring of send-back spring 36, make send-back tension arm 34 other ends articulate driven support arm 35 1 ends of this send-back, driven support arm 35 other end end faces of this send-back are hubbed at wall body 101 rotationally, the driven support arm of send-back 35 nearly zones, stage casing are with rotationally in conjunction with this send-back flower wheel 312, allow the adjacent send-back driving wheel 311 in send-back flower wheel 312 positions, under the normality, the send-back master, flower wheel 311, the 312nd, clamp band 20.

Please referring to Fig. 1, Fig. 2, shown in Figure 4, this tension portion 50 comprises a tension motor 51, a tension driving wheel 511, a tension flower wheel 513, a tension linkage group 52, and tension linkage group 52 comprises a tension horizon bar 53, the L-shaped driven support arm 55 of tension of a tensile arm 54; Wherein:

This tension motor 51 is fixed in wall body 101, form rotation in order to link and to drive this tension driving wheel 511, and tension flower wheel 513 is positioned at tension driving wheel 511 adjacent sides, can pinch or press from both sides in order to both and move back band 20, please refer to Fig. 6 in this, tension driven wheel 511,513 1 ends are the gear mesh form, the other end forms active trough of belt 512, the carrying secretly of convex hoop shape of concave ring groove shape respectively and encircles 514, enter in the active trough of belt 512 in order to carry ring 514 secretly, make band 20 active trough of belt 512, carry secretly the ring 514 between, be subjected to both crampings;

In addition, tension horizon bar 53 1 ends of this tension linkage group 52 are hubbed at wall body 101 rotationally, tension horizon bar 53 other ends are installed rotating tension sliding part 531 (being bearing shown in the figure), utilizing tension sliding part 531 to be contacted with on the tension cam 42 (so strains horizon bar and gives prominence to more forward than the send-back horizon bar, before the existence, after potential difference), these tensile arm 54 1 ends are arranged at the below of tension horizon bar 53 nearly middle positions, tensile arm 54 and 53 back-moving springs 56 that a tension-adjustable is installed of tension horizon bar, this installation kenel is that a bolt 57 is installed by tension horizon bar 53, and straining two nuts 571 of screw lock on the horizon bar 53, install this back-moving spring 56 in bolt 57 again, the perforation 541 that tensile arm 54 should be held, make this tensile arm 54 in bolt 57, be subjected to shoring of back-moving spring 56, at last screw togather one in order to compress the end nut 572 of this tensile arm 54 in bolt 57, articulate this in order to tensile arm 54 other ends and strain driven support arm 55 1 ends, this strains driven support arm 55 other end end faces to be hubbed at rotationally on the wall body 101, this tension flower wheel 513 is then strained on the driven support arm 55 to be hubbed at this rotationally, and between two ends, keep the adjacent tension driving wheel 511 in tension flower wheel 513 positions, under the normality of not straining band 20, tension is main, flower wheel 511, the 513rd, keep a little gap and do not clamp band 20.

The utility model is for another Fig. 2, shown in Figure 3, and wall body 101 is provided with a proximity switch 18, and it is correspondingly positioned on the send-back tension arm 34, the outstanding nearly send-back spring of finger 36 positions; In addition, send-back horizon bar 33 is connected a returning spring 44 with tension between the horizon bar 53.

The utility model is when using enforcement, please referring to Fig. 1, Fig. 2, when starting automatic send-back, the band 20 of tep reel mechanism 12 enters send-back portion 30 through guide wheel group 14, storage belting 13, this moment is as Fig. 2, Fig. 7, Fig. 8, send-back motor 31 retrograde rotation at high speeds are introduced band 20, pinch band 20 and send into shelf group 11 (imaginary line position of Fig. 8) when fixed point stops, and proximity switch 18 has detected band 20 at this moment;

Secondly, carry out in the bale packing, starting switch is to make main shaft 151 (shown in Figure 1) turning anticlockwise, send-back cam 40 is rotation relatively thereupon, stop up to moving back the band position, what stop is as Fig. 2 at that time, Fig. 8, send-back cam 40 pushing tows shown in Figure 9 raise the send-back sliding part 331 of send-back horizon bar 33, in order to rise send-back tension arm 34 (as the solid line position of Fig. 8), this moment is because of starting its detecting effect near proximity switch 18, proximity switch 18 sends signal and picks up counting to inductor and move back the band time, and send-back tension arm 34 other ends are stretched toward upwarping synchronously, making send-back tension arm 34 be hubbed at wall body 101 with it is fulcrum, drive send-back flower wheel 312 towards send-back driving wheel 311 near and more clamp band 20, send-back motor 31 is just changeing and moves back band (moving back the band time can be controlled by program-controlled device, adjust);

After moving back band timing finishing, main shaft 151 remained in operation about about 0.08 second, as Figure 10, Figure 11, because main shaft 151 remains in operation, so having broken away from this, send-back cam 40 shores the state of send-back horizon bar 33, be subjected to the restoring force of returning spring 44 and rapid return, up to main shaft 151 operative conditions, be that tension cam 42 touches and backs down the tension sliding part 531 of tension horizon bar 53 down, pushing tensile arm 54 1 ends, form to hold to stick up to stretch in addition and strain driven support arm 55 with priming, form counter-rotating to be hubbed at wall body 101 these ends, the tension master that order separates originally, flower wheel 511,513 is close, tension is main, flower wheel 511,513 gear enters fully and meshes the stage, with active trough of belt 512 with carry ring 514 secretly and clamp bands 20, starting tension motor 51 is just changeing, band 20 is drop-down and pick up counting, the still continuous running of main shaft 151 this moment, until the contact of tension sliding part 531 is to straining in the finishing of cam 42 nadirs, this promptly prepares and unclasps band 20 and in order to banding machine band 20 is fused, cutting-off process is finished the bale packing action; And main shaft 151 continuous runnings, tension portion 50 breaks away from the control of tension cam 42, is subjected to the elastic-restoring force of returning spring 44, one switches back to initial original position, send-back motor 31 entry into service send-backs make band 20 partly enter in the storage belting 13 preparation bale packing operation next time.

Aforementioned back-moving spring 56, send-back spring 36, can control tensile arm 54, send-back tension arm 34 by nut 371,571 along

bolt

37,57 respectively, it adjusts the power of straining flower wheel 513, send-back flower wheel 312 clamping bands 20 respectively, and the function of tension adjustment is provided.

Though the utility model discloses with specific embodiment; but it is not in order to limit the utility model; any those skilled in the art; the displacement of the equivalent assemblies of under the prerequisite that does not break away from design of the present utility model and scope, having done; or, all should still belong to the category that this patent is contained according to equivalent variations and modification that the utility model scope of patent protection is done.

Claims

1. A strapping machine with a belt tension device for sending and unwinding, the strapping machine has a body, a transmission part, a sending and retreating belt part, and a tensioning part, and is characterized in that:

The transmission part has a main shaft, and the main shaft fixes a feed-back belt cam corresponding to the feed-back belt part and a tightening cam corresponding to the tightening part, and the raised positions of the feed-back belt cam and the tension cam are staggered;

The feeding and unwinding belt part includes a feeding and unwinding belt motor, a feeding and unwinding belt driving wheel, a feeding and unwinding belt driven wheel, and a feeding and unwinding belt connecting rod group. Sending back belt tension arm, one sending back belt driven support arm; where:

The feeding and unwinding belt motor is connected and drives the feeding and unwinding belt driving wheel to form a rotation. One end of the feeding and unwinding belt horizontal bar is rotatably pivoted on the machine body, and the other end contacts the feeding and unwinding belt cam, and one end of the feeding and unwinding belt tension arm is It is arranged above the horizontal bar of the send-back belt, and a send-back belt spring with adjustable tension is installed between the send-back belt tension arm and the send-back belt horizontal bar, and the other end of the send-back belt tension arm is pivotally connected to the send-back belt from the One end of the driven support arm, the other end of the driven support arm is rotatably pivoted on the wall body, the driven support arm is rotatably combined with the driven wheel of the feeding and retreating belt, and the position of the driving and retracting belt driven wheel is kept adjacent to the sending and retreating With driving wheel to pinch the belt;

The tensioning part includes a tensioning motor, a tensioning driving wheel, a tensioning driven wheel, and a tensioning connecting rod group, and the tensioning connecting rod group includes a tensioning horizontal bar, a tensioning force arm, a Tension the follower arm; where:

The tightening motor connects and drives the tensioning driving wheel to form a rotation. One end of the tensioning driving wheel and the driven wheel is in the form of gear meshing, and the other end is provided by two corresponding sides for the belt to be put through;

One end of the tensioning horizontal rod is rotatably pivoted on the body, one end of the tensioning horizontal rod is in contact with the tensioning cam, the other end corresponds to one end of the tensioning tension arm, and is connected between the tensioning tension arm and the tensioning horizontal rod A tension spring with adjustable tension is installed between them, the other end of the tension arm is pivotally connected to one end of the tension driven arm, and the other end surface of the driven arm is rotatably pivoted on the machine body. The driving wheel is rotatably pivoted on the tensioning driven support arm, and the position of the tensioning driven wheel is kept adjacent to the tensioning driving wheel, and a return spring is connected between the feed-back belt horizontal bar and the tensioning horizontal bar .

2. The strapping machine with a belt tension device according to claim 1, characterized in that: the main shaft of the transmission part is relatively located on the side between the belt feeding part and the tensioning part.

3. The strapping machine with a belt tension device according to claim 2, characterized in that: the body is on the upper part of the belt feeding part, and an upper belt rail for guiding the belt to be sent back is set, Located between the feeding and unwinding part and the tensioning part is the middle-feeding belt rail.

4. The strapping machine with a belt tension device according to claim 1, characterized in that: the driven arm of the belt and the tension driven arm are both L-shaped.

5. The strapping machine with a belt tension device as claimed in claim 1, characterized in that: the horizontal bar for sending back the belt and the tensioning horizontal bar are at one end of the belt cam for sending back and the tensioning cam respectively, Each installs a rotatable feed-back belt slide.

6. The strapping machine with tension device for feeding and returning belt according to claim 1, characterized in that: the installation type of spring for sending and returning belt is that a bolt is installed by a horizontal bar for sending and returning belt, and the horizontal bar for sending and returning belt Screw two nuts on the upper screw, wear the perforation of the end of the send-back belt spring and the send-back belt tension arm on the bolt, and the send-back belt tension arm is supported by the send-back belt spring in the bolt.

7. The strapping machine with a belt tension device as claimed in claim 1, characterized in that: one end of the tension driving wheel forms a concave ring groove-shaped driving belt groove, and the tension driven wheel forms a convex ring-shaped correspondingly. An entrainment ring, the entrainment ring enters the driving belt groove, and the drawstring is located between the driving belt groove and the entrainment ring.

8. The strapping machine with a belt tension device as claimed in claim 1, characterized in that: said tension spring is installed in the form of a bolt installed by a tension horizontal rod, and the tension horizontal rod is screwed Two nuts, the bolt wears the tension spring, the perforation at the end of the tension arm, the tension arm is supported by the tension spring in the bolt, and the bolt passes through the end of the tension arm to lock A bottom nut.

9. The strapping machine with a belt tension device according to claim 1, wherein a proximity switch is installed on the body above the tension arm of the belt, and is close to the spring position of the belt.