CN213117328U

CN213117328U - Tensioning device for driven chain wheel of steel feeding machine

Info

Publication number: CN213117328U
Application number: CN202021525443.XU
Authority: CN
Inventors: 张永庆; 董清晔; 黄冉
Original assignee: Daye Special Steel Co Ltd
Current assignee: Daye Special Steel Co Ltd
Priority date: 2020-07-28
Filing date: 2020-07-28
Publication date: 2021-05-04
Anticipated expiration: 2030-07-28

Abstract

The utility model provides a tensioning device of driven sprocket of lower steel machine, include: the pressing plate is in a cuboid shape, a sliding groove is formed in the pressing plate, the sliding groove penetrates through two opposite side faces of the pressing plate and extends along the length direction of the pressing plate, a stopping portion is arranged at one end of the pressing plate along the length direction, and a first long round hole for communicating the sliding groove with an external space is formed in the stopping portion; a first end of the pull rod penetrates through the first long circular hole and extends into the sliding groove, a second end of the pull rod is positioned outside the sliding groove, and a blocking piece is fixed at the second end of the pull rod; the sliding block is arranged in the sliding groove in a sliding manner, is fixedly connected with the first end of the pull rod, and is provided with a connecting part for connecting with the driven chain wheel; the pressure spring is sleeved on the pull rod, one end of the pressure spring abuts against the stopping part, and the other end of the pressure spring abuts against the blocking piece. The utility model provides a overspeed device tensioner tear open, adorn the convenience, and the scene is torn open, is adorned the part few, can show and improve maintenance operating efficiency, has improved the meshing situation between the chain and the sprocket teeth of a cogwheel.

Description

Tensioning device for driven chain wheel of steel feeding machine

Technical Field

The invention belongs to the technical field of steel rolling equipment, and particularly relates to a tensioning device for a driven chain wheel of a steel discharging machine.

Background

The steel discharging machine in row is arranged behind the hot rolling bar mill and used for horizontally moving rolled pieces from one end to the other end in parallel, the steel discharging machine in row is composed of a plurality of steel discharging machines which are arranged in parallel, 1 trolley used for placing the rolled pieces is arranged on a rack of each steel discharging machine, and the trolley is driven by a chain to move on the rack. Generally, the quantity of dolly is decided according to the length of rolled piece, when increasing to more than 20 along with dolly quantity, the synchronism requirement of dolly is higher, consequently, it is higher to dolly chain tensioning requirement, among the prior art, like in the comparison document that the bulletin number is CN204127225U, fix on sprocket support through No. 2 retaining rings, sprocket shaft passes through sprocket shaft briquetting and No. 1 retaining ring and installing support fixed connection, sprocket support passes through sprocket support briquetting and installing support fixed connection, the sprocket shaft cup joints on sprocket support, compression spring cup joints on sprocket support's right-hand member position, realize the tensioning to dolly chain, but its main problem who exists has: (1) when the chain wheel is disassembled, the chain wheel shaft must be transversely and independently disassembled and assembled from the mounting bracket, and the site operation is very inconvenient because the surrounding space of the equipment is limited and the number of disassembled and assembled parts is large; (2) the chain wheel bracket causes the longitudinal dimension of the mounting bracket to be too long, and the arrangement of other peripheral equipment is influenced; (3) there may be misalignment between the driven sprocket and the axis of the sprocket shaft due to manufacturing and installation errors, resulting in poor sprocket tooth contact with the chain rollers.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art or the related art.

In view of the above, the present invention provides a tension device for a driven sprocket of a steel feeding machine.

In order to achieve the above object, the present invention provides a tensioning device for a driven sprocket of a lower steel machine, comprising: the pressing plate is in a cuboid shape, a sliding groove is formed in the pressing plate, the sliding groove penetrates through two opposite side faces of the pressing plate and extends along the length direction of the pressing plate, a stopping portion is arranged at one end of the pressing plate along the length direction, and a first long round hole for communicating the sliding groove with an external space is formed in the stopping portion; a first end of the pull rod penetrates through the first long circular hole and extends into the sliding groove, a second end of the pull rod is positioned outside the sliding groove, and a blocking piece is fixed at the second end of the pull rod; the sliding block is arranged in the sliding groove in a sliding manner, is fixedly connected with the first end of the pull rod, and is provided with a connecting part for connecting with the driven chain wheel; the pressure spring is sleeved on the pull rod, one end of the pressure spring abuts against the stopping part, and the other end of the pressure spring abuts against the blocking piece.

Furthermore, side walls are arranged on two sides of the sliding groove and arranged along the length direction of the pressing plate, and the surfaces of the side walls in sliding fit with the sliding blocks are sliding surfaces; the first long round hole extends along the thickness direction of the pressing plate and forms a first opening on one side end face of the stopping portion, a sliding limiting portion protruding out of the sliding surface is arranged on one side, away from the first opening, of the sliding surface, and the sliding limiting portion extends along the length direction of the pressing plate.

Furthermore, a first step structure is arranged at the second end of the pull rod, a nut is sleeved on the first step structure, and the separation blade is sleeved on the pull rod and fixed on the pull rod through the nut and the pressure spring.

Furthermore, the pressing plate is provided with a plurality of connecting holes for installation.

Furthermore, the connecting part is a round hole, and a key groove is formed in the inner wall of the round hole.

Furthermore, the sliding block and the pull rod are of an integrated structure.

Further, the steel discharging machine comprises: the connecting device comprises a rack, wherein two connecting seats are arranged at one end of the rack at intervals, each connecting seat is provided with a second long circular hole, and a second opening is formed in the end face, away from the rack, of each connecting seat by the second long circular hole; the driven chain wheel assembly comprises a driven chain wheel and a chain wheel shaft, the driven chain wheel is rotatably sleeved on the chain wheel shaft, and the driven chain wheel is arranged in a gap between the two connecting seats; a pressing plate is fixedly arranged on each connecting seat, and two ends of the chain wheel shaft respectively penetrate through a second long circular hole and then are fixedly connected with the sliding block; the chain is in transmission connection with the driven chain wheel; wherein, the driven chain wheel and the chain are both tensioned pieces.

Furthermore, the two pressing plates are respectively installed on the outer sides of the two connecting seats through screws, the stopping portions of the pressing plates are arranged towards the second openings, the extending directions of the sliding grooves of the pressing plates are overlapped with the extending directions of the second long circular holes, and therefore the two ends of the chain wheel shaft respectively penetrate through the two second long circular holes and then extend into the circular holes of the sliding blocks to achieve key connection.

Furthermore, the sliding limiting parts of the two pressing plates are positioned on one side far away from the connecting seat; the two ends of the chain wheel shaft are respectively provided with a second step structure, each second step structure is abutted against one side of one sliding block facing the connecting seat, and one side of the sliding block, far away from the connecting seat, is abutted against the sliding limiting part of the pressing plate.

Further, the steel discharging machine further comprises: the trolley is placed at the top of the rack, a plurality of rollers are arranged below the trolley, and each roller is coaxially fixed with a driven chain wheel; the driving chain wheel, the driven chain wheel and the driven chain wheel are all in transmission connection with the chain.

The technical scheme provided by the embodiment of the invention has the following beneficial effects:

(1) the tensioning device is convenient to integrally disassemble and assemble, few parts are disassembled and assembled on site, and the overhauling operation efficiency can be obviously improved.

(2) The tensioning devices are arranged on two sides of the rack, and in addition, because the two springs are connected in parallel, the rigidity is increased, the length of the springs is reduced under the condition that the tensioning force is not changed, so that the longitudinal length of the steel discharging machine is obviously shortened.

(3) The tensioning devices for tensioning the chain are arranged on two sides of the rack, and nuts on two sides can be independently adjusted to adjust the deviation condition between the axes of the driven chain wheel and the chain wheel shaft, so that the meshing condition between the chain and the teeth of the chain wheel can be improved.

(4) When the driven chain wheel is tensioned, the driven chain wheel moves in a slide way formed between the sliding groove and the second long circular hole, and the pressing plate can play a role in closing a second opening at the end part of the rack, so that the strength of the rack cannot be weakened due to the second opening.

Drawings

FIG. 1 shows a schematic structural view of a tensioner for a driven sprocket of a lower steel machine according to one embodiment of the present invention;

FIG. 2 shows a schematic structural view of a platen according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a pull rod and a slide block according to an embodiment of the invention;

FIG. 4 shows a schematic structural diagram of a rack of one embodiment of the present invention;

FIG. 5 shows a schematic structural view of a tensioner for a lower steel machine and a driven sprocket of one embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view taken along line A-A of FIG. 5;

fig. 7 shows a schematic cross-sectional structure of the portion B-B in fig. 5.

The symbols in the figures are as follows:

10 press plates, 12 sliding grooves, 122 sliding surfaces, 124 sliding limiting parts, 14 stopping parts, 142 first long round holes, 144 first openings, 16 connecting holes, 18 screws, 20 pull rods, 22 first ends, 24 second ends, 242 first step structures, 26 blocking pieces, 28 nuts, 30 sliding blocks, 32 connecting parts, 40 compression springs, 50 machine frames, 52 connecting seats, 522 second long round holes, 524 second openings, 62 driven sprockets, 64 sprocket shafts, 642 second step structures, 65 spacers, 66 keys, 67 through covers, 68 screws, 69 bearings, 70 chains, 80 trolleys, 82 rollers and 84 driven sprockets.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention and advantageous effects thereof will be described in further detail below with reference to the accompanying drawings.

Example one

As shown in FIGS. 1-3, in one embodiment, a tensioning device for a driven sprocket of a lower steel machine is provided for adjusting and tensioning the driven sprocket of the lower steel machine.

The tensioner includes: the pressing plate 10 is in a cuboid shape, a sliding groove 12 is formed in the pressing plate 10, the sliding groove 12 penetrates through two opposite side faces of the pressing plate 10 and extends along the length direction of the pressing plate 10, a stopping portion 14 is arranged at one end of the pressing plate 10 along the length direction, a first long circular hole 142 which is communicated with the sliding groove 12 and an external space is formed in the stopping portion 14, a first end 22 of the pull rod 20 penetrates through the first long circular hole 142 and extends into the sliding groove 12, the sliding block 30 is slidably arranged in the sliding groove 12, the sliding block 30 is fixedly connected with the first end 22 of the pull rod 20, a second end 24 of the pull rod 20 is located outside the sliding groove 12, the sliding block 30 can slide in the sliding groove 12 under the pulling of the pull rod 20, a blocking piece 26 is fixed at the second end 24 of the pull rod 20, the pressing spring 40 is sleeved on the pull rod 20, one end of the pressing spring 40 abuts against the stopping portion 14, the other end of the pressing spring abuts against the blocking piece 26, when the driven sprocket 62 is connected to the slider 30 through the connecting portion 32, the compressed spring 40 provides a tensioning force to the driven sprocket 62, specifically, the compressed spring 40 applies a pushing force to the pull rod 20 away from the pressing plate 10 to push the second end 24 of the pull rod 20 to move in a direction away from the pressing plate 10, the pull rod 20 pulls the slider 30 to slide towards one side of the stopper 14, and the driven sprocket 62 moves along with the slider 30 under the pulling of the slider 30, so that a tensioning force is provided to the driven sprocket 62, and the tensioning of the driven sprocket 62 is realized.

The length direction, height direction and thickness direction of the pressing plate 10 are the directions indicated by arrows in fig. 2.

Further, by changing the distance between the blocking piece 26 and the stopping portion 14, the pressure applied to the compression spring 40 is adjusted, so that the tension of the driven sprocket 62 is adjusted.

As shown in fig. 1 and 2, the sliding groove 12 further has side walls on two sides thereof, the side walls are disposed along the length direction of the pressing plate 10, and the surface of the side walls in sliding fit with the sliding block 30 is a sliding surface 122, so that the sliding block 30 slides more stably by the fit between the sliding block 30 and two opposite sliding surfaces 122, and the shaking of the sliding block 30 is reduced, the first long circular hole 142 extends along the thickness direction of the pressing plate 10 and forms a first opening 144 on one side end surface of the stopper portion 14, so that the pull rod 20 can be mounted or dismounted from the first opening 144, the difficulty in dismounting the tensioning device is reduced, the sliding stopper portion 124 protruding out of the sliding surface 122 is disposed on one side of the sliding surface 122 away from the first opening 144, and the sliding stopper portion 124 extends along the length direction of the pressing plate 10, and the sliding stopper portion 124 can prevent the sliding block 30 from sliding out of the sliding surface 122 and one side away from the first.

As shown in fig. 1 and fig. 3, further, the second end 24 of the pull rod 20 is provided with a first step structure 242, the first step structure 242 is sleeved with a nut 28, the baffle 26 is sleeved on the pull rod 20 and fixed on the pull rod 20 through the nut 28 and a compression spring 40, specifically, the baffle 26 can move on the pull rod 20, the nut 28 abuts against one side surface of the baffle 26, the compression spring 40 abuts against the other side surface of the baffle 26, and when the pull rod 20 is subjected to the pushing force of the compression spring 40 and the pull rod 20 is subjected to the pulling force of the driven sprocket 62 to balance, the baffle 26 is fixed on the pull rod 20. It should be noted that the first step structure 242 is provided with a thread matching with the nut 28, so that the nut 28 can be adjusted to different positions of the first step structure 242 by rotating the nut 28, so as to push the blocking piece 26 to approach or separate from the blocking portion 14, so as to compress the compressed spring 40 or expand the compressed spring 40, thereby changing the tension applied by the pull rod 20 to the driven sprocket 62.

As shown in fig. 1 and fig. 3, a pin hole is further formed on the first step structure 242 of the pull rod 20, a groove is formed at an end of the nut 28 away from the blocking piece 26, and a pin sequentially passes through the groove and the pin hole to abut against a side wall of the groove, so as to prevent the nut 28 from rotating relative to the pull rod 20, thereby achieving a locking function of the nut 28.

As shown in fig. 1, a plurality of connecting holes 16 are further formed on the pressing plate 10 for mounting the pressing plate 10, so that the pressing plate 10 can be mounted on different equipment through the connecting holes 16 to tension fittings of the different equipment.

As shown in fig. 3, further, the connecting portion 32 is a circular hole, and the inner wall of the circular hole is provided with a key slot, so that the slider 30 is detachably linked with the shaft of the driven sprocket 62 through the circular hole (the connecting portion 32) by means of a key 66, and the slider 30 is conveniently detached and installed from and on the driven sprocket 62.

Optionally, the slider 30 is of unitary construction with the tie rod 20.

Example two

As shown in fig. 4-6, the tensioning device for the driven sprocket of the lower steel machine also has the following characteristics:

the steel machine includes down: the chain wheel assembly comprises a rack 50, a driven chain wheel assembly and a chain 70, wherein one end of the rack 50 is provided with two connecting seats 52 which are arranged at intervals, each connecting seat 52 is provided with a second long round hole 522, and a second opening 524 is formed in the end face of one end, far away from the rack 50, of each connecting seat 52 through each second long round hole 522; the driven chain wheel assembly comprises a driven chain wheel 62 and a chain wheel shaft 64, the driven chain wheel 62 is rotatably sleeved on the chain wheel shaft 64, and the driven chain wheel 62 is arranged in a gap between the two connecting seats 52; each connecting seat 52 is fixedly provided with a tensioning device, a pull rod 20 and a pressure spring 40 for tensioning a chain 70 are arranged on two sides of the rack 50, and the rigidity is increased because the pressure springs 40 are connected in parallel, so that the length of the pressure spring 40 is reduced under the condition of unchanged tensioning force, and the longitudinal length of the steel discharging machine is obviously shortened; it should be emphasized that, by installing the tension rod 20 and the compression spring 40 for tensioning the chain 70 on both sides of the frame 50, the nuts 28 on both sides can be adjusted independently to adjust the skew between the driven sprocket 62 and the sprocket shaft 64, which is beneficial to improving the meshing condition between the teeth of the chain 70 and the sprocket 62; two ends of the chain wheel shaft 64 respectively cross a second long circular hole 522 and then are fixedly connected with the sliding block 30 in the tensioning device, when the sliding block 30 slides in the sliding groove 12, the chain wheel shaft 64 and the chain wheel can be driven to slide along with the sliding block 30, the chain 70 is in transmission connection with the driven chain wheel 62 and is connected with the sliding block 30 through the chain wheel shaft 64 so as to tension the driven chain wheel 62 and the chain 70, and the driven chain wheel 62 and the chain 70 are both tensioned parts.

Specifically, as shown in fig. 7, the driven sprocket assembly further includes a spacer 65, a key 66, a transparent cover 67, a screw 68, a bearing 69, and the like, the transparent cover 67 is fixed on the driven sprocket 62 by the screw 68, the spacer 65 is sleeved on the sprocket shaft 64, the spacer 65 is disposed between the transparent cover 67 and the sprocket shaft 64, an inner ring of the bearing 69 is connected with the sprocket shaft 64, an outer ring of the bearing 69 is connected with the driven sprocket 62, so that the driven sprocket 62 can rotate on the sprocket shaft 64, and the sprocket shaft 64 is connected with the circular hole key of the slider 30 by the key 66, so as to realize detachable connection between the sprocket shaft 64 and the slider 30, and facilitate installation or detachment of the sprocket shaft 64.

The compression spring 40 is specifically a belleville spring.

Wherein, as shown in fig. 4, it should be noted that the driven sprocket assembly is installed to the frame 50 through the second opening 524, and then the two ends of the sprocket shaft 64 are installed to the slider 30, and similarly, when the driven sprocket assembly is detached from the frame 50, the two ends of the sprocket shaft 64 of the driven sprocket assembly are detached from the slider 30, and the driven sprocket assembly is taken out through the second opening 524, which is convenient to disassemble and assemble.

Specifically, the pressing plates 10 in the two tensioning devices are respectively mounted on the outer sides of the two connecting seats 52 through screws 18, the stopping portions 14 of the pressing plates 10 are arranged toward the second openings 524, the extending direction of the sliding grooves 12 of the pressing plates 10 coincides with the extending direction of the second long circular holes 522, so that the two ends of the sprocket shaft 64 respectively penetrate through the two second long circular holes 522 and then extend into the circular holes of the sliding blocks 30 to realize key 66 connection, that is, the sliding grooves 12 and the second long circular holes 522 form sliding ways for the sliding blocks 30 and the driven sprocket assembly to slide, when the driven sprocket assembly is tensioned, the driven sprocket assembly moves in the sliding way formed between the pressing plates 10 and the connecting seats 52 on the rack 50, and the pressing plates 10 can play a role in closing the second openings 524, and the strength of the rack 50 cannot be weakened due to the.

As shown in fig. 7, further, the slide limiting portions 124 of the two pressing plates 10 are located at a side away from the connecting seat 52, the second step structures 642 are respectively disposed at two ends of the sprocket shaft 64, each second step structure 642 abuts against a side of the slider 30 in one tensioning device facing the connecting seat 52, and a side of the slider 30 away from the connecting seat 52 abuts against the slide limiting portion 124 of the pressing plate 10, so that the movement of the slider 30 along the thickness direction of the pressing plate 10 is limited by the slide limiting portions 124 and the second step structures 642, and the movement of the slider 30 along the height direction of the pressing plate 10 is limited by the two sliding surfaces 122 on the pressing plate 10, so that the slider 30 can only move along the length direction of the pressing plate 10, the degree of freedom of the slider 30 is reduced, the sliding track of the sliding is more accurate and stable, and the slider 30 is prevented from deviating from the predetermined track during sliding and swinging.

EXAMPLE III

As shown in fig. 5, the tensioning device for the driven sprocket of the lower steel machine also has the following characteristics: the steel machine still includes down: the trolley 80 is placed at the top of the rack 50, a plurality of rollers 82 are arranged below the trolley 80, each roller 82 is coaxially fixed with one driven sprocket 84, the driving sprocket, the driven sprocket 84 and the driven sprocket 62 are in transmission connection with the chain 70 in the tensioning structure of the lower steel machine, the driving sprocket drives the driven sprocket 84 and the driven sprocket 62 to rotate under the driving of the chain 70, the rollers 82 of the trolley 80 rotate under the driving of the driven sprocket 84, and therefore the trolley 80 moves at the top of the lower rack 50 and tensions the driven sprocket 62 and the chain 70.

Example four

As shown in fig. 5, the fourth embodiment proposes a chain tensioner.

The chain tensioner comprises: the chain wheel assembly comprises a rack 50, a driven chain wheel (namely a driven chain wheel assembly), a pull rod 20, a belleville spring (namely a compression spring 40) and a pressure plate 10, wherein specifically, long holes (namely second long round holes 522) on two sides of the rack 50 penetrate through to the end part, so that the driven chain wheel can be conveniently detached or installed; the pull rod 20 and the disc spring for tensioning the chain 70 are arranged on two sides of the frame 50; the driven sprocket, when tensioned, moves in a slide formed between a platen and the frame 50.

As shown in fig. 4, the long holes (i.e., the second long circular holes 522) on both sides of the frame 50 extend all the way to the end, and the driven sprocket can be directly moved in and out of the opening (i.e., the second opening 524) when being dismounted and mounted.

As shown in FIG. 5, the trolley 80 is positioned on the top of the lower steel machine frame 50 and is pulled by the chain 70 to move left and right on the frame 50. The driven sprocket and sprocket shaft 64, together with the spacer 65, the key 66, the through cover 67, the screw 68, the bearing 69, etc., form a unit, which is mounted in the hole of the drawbar 20 through both ends of the sprocket shaft 64.

The press plates on both sides of the frame 50 are connected to the frame 50 by screws 18, and the space between the two forms 2 longitudinal slideways in which the tail ends of the pull rods 20 can move.

The end of the pull rod 20 is fitted with a belleville spring and nut 28 through the U-shaped notch (i.e., the first slotted hole 142) of the pressure plate. Tightening the nut 28 on the end of the tie rod 20 compresses the belleville springs, which causes the tie rod 20 and the driven sprocket to move back for tensioning.

When the driven sprocket is removed, the driven sprocket assembly can be removed from the opening at the end of the frame 50 (i.e., the second opening 524) by removing the press plates on both sides of the frame 50.

The invention has the following beneficial effects: the tensioning device is convenient to integrally disassemble and assemble, few parts are disassembled and assembled on site, and the overhauling operation efficiency can be obviously improved; the tensioning devices are arranged on two sides of the rack, and in addition, because the two springs are connected in parallel, the rigidity is increased, and the length of the springs is reduced under the condition that the tensioning force is not changed, so that the longitudinal length of the steel discharging machine is obviously shortened; the tensioning devices for tensioning the chain are arranged on two sides of the rack, and nuts on the two sides can be independently adjusted to adjust the deviation between the driven chain wheel and the axis of the chain wheel shaft 64, so that the meshing condition between the chain and the teeth of the chain wheel can be improved; when the driven chain wheel is tensioned, the driven chain wheel moves in a slide way formed between the sliding groove and the second long circular hole, and the pressing plate 10 can play a role in closing a second opening at the end part of the rack, so that the strength of the rack cannot be weakened due to the second opening.

In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tensioning device for a driven sprocket of a lower steel machine is characterized by comprising:

the pressing plate is in a cuboid shape, a sliding groove is formed in the pressing plate, the sliding groove penetrates through two opposite side faces of the pressing plate and extends along the length direction of the pressing plate, a stopping portion is arranged at one end of the pressing plate along the length direction, and a first long round hole communicated with the sliding groove and the external space is formed in the stopping portion;

a first end of the pull rod penetrates through the first long round hole and extends into the sliding groove, a second end of the pull rod is positioned outside the sliding groove, and a blocking piece is fixed at the second end of the pull rod;

the sliding block is arranged in the sliding groove in a sliding manner, the sliding block is fixedly connected with the first end of the pull rod, and a connecting part used for being connected with the driven chain wheel is arranged on the sliding block;

and the compression spring is sleeved on the pull rod, one end of the compression spring is abutted against the stopping part, and the other end of the compression spring is abutted against the blocking piece.

2. The tensioning device for driven chain wheel of lower steel machine according to claim 1,

side walls are arranged on two sides of the sliding groove and are arranged along the length direction of the pressing plate, and the surfaces, which are in sliding fit with the sliding blocks, on the side walls are sliding surfaces;

the first long round hole extends along the thickness direction of the pressing plate and forms a first opening on one side end face of the stopping part,

and a sliding limiting part protruding out of the sliding surface is arranged on one side of the sliding surface, which is far away from the first opening, and the sliding limiting part extends along the length direction of the pressing plate.

3. The tensioning device for driven chain wheel of lower steel machine according to claim 1,

the second end of the pull rod is provided with a first step structure, a nut is sleeved on the first step structure, and the blocking piece is sleeved on the pull rod and fixed on the pull rod through the nut and the pressure spring.

4. The tensioning device for driven chain wheel of lower steel machine according to claim 1,

the pressing plate is provided with a plurality of connecting holes for installation.

5. The tensioning device for driven chain wheel of lower steel machine according to claim 1,

the connecting part is a round hole, and a key groove is formed in the inner wall of the round hole.

6. The tensioning device for driven chain wheel of lower steel machine according to claim 1,

the sliding block and the pull rod are of an integral structure.

7. The tensioning device for the driven sprocket of the lower steel machine according to claim 1, wherein the lower steel machine comprises:

the connecting device comprises a rack, wherein two connecting seats are arranged at one end of the rack at intervals, each connecting seat is provided with a second long round hole, and a second opening is formed in the end face, away from one end of the rack, of each connecting seat by the second long round hole;

the driven chain wheel assembly comprises a driven chain wheel and a chain wheel shaft, the driven chain wheel is rotatably sleeved on the chain wheel shaft, and the driven chain wheel is arranged in a gap between the two connecting seats;

each connecting seat is fixedly provided with one pressing plate, and two ends of the chain wheel shaft respectively penetrate through one second long circular hole and then are fixedly connected with the sliding block;

the chain is in transmission connection with the driven chain wheel;

wherein, the driven chain wheel and the chain are both tensioned pieces.

8. The tensioning device for the driven sprocket of the lower steel machine as claimed in claim 7, wherein:

the two pressing plates are respectively installed on the outer sides of the two connecting seats through screws, the stopping portions of the pressing plates face the second openings, the extending directions of the sliding grooves of the pressing plates coincide with the extending directions of the second long circular holes, and therefore the two ends of the chain wheel shaft respectively penetrate through the two second long circular holes and then stretch into the circular holes of the sliding blocks to achieve key connection.

9. The tensioning device for the driven sprocket of the lower steel machine as claimed in claim 8, wherein:

the sliding limiting parts of the two pressing plates are positioned on one side far away from the connecting seat;

and the two ends of the chain wheel shaft are respectively provided with a second step structure, each second step structure is abutted against one side of the sliding block, which faces the connecting seat, of the sliding block, and one side, which is far away from the connecting seat, of the sliding block is abutted against the sliding limiting part of the pressing plate.

10. The lower steel machine driven sprocket tensioning device of claim 7, further comprising:

the trolley is placed at the top of the rack, a plurality of rollers are arranged below the trolley, and each roller is coaxially fixed with a driven chain wheel;

the driving chain wheel, the driven chain wheel and the driven chain wheel are all in transmission connection with the chain.