CN111728665A

CN111728665A - Medical electric saw equipment capable of adjusting diameter of saw teeth according to self weight of object

Info

Publication number: CN111728665A
Application number: CN202010641762.5A
Authority: CN
Inventors: 许杰
Original assignee: Qingdao Longao Medical Equipment Co Ltd
Current assignee: Qingdao Longao Medical Equipment Co Ltd
Priority date: 2020-07-06
Filing date: 2020-07-06
Publication date: 2020-10-02

Abstract

The utility model provides a adjust medical electric saw equipment of sawtooth diameter according to object dead weight, include the work box and set up in feeding the chamber in the work box, feed the fixed hydraulic press that is equipped with in chamber bottom, it is fixed to be equipped with the feed horizontal pole to feed the hydraulic press upside, it slides and is equipped with the feed montant to feed the horizontal pole right-hand member, be equipped with in the feed montant and feed the slip chamber, place this device behind the assigned position, fix the back with the position that the patient need perform the operation, the size of saw bit can be adjusted according to the weight at operation position to this equipment, and garrulous blood meat and the bone sediment that splashes at the in-process of saw can be blocked by glass, can have garrulous blood meat and bone sediment to splash always when the operation, and equipment can continuously clear up glass, the better provides better field of vision for the doctor, more.

Description

Medical electric saw equipment capable of adjusting diameter of saw teeth according to self weight of object

Technical Field

The invention relates to the technical field of medical orthopedics, in particular to medical electric saw equipment for adjusting the diameter of a sawtooth according to the self weight of an object.

Background

The bone saw is a common instrument for orthopedic surgery, a bone injury patient needs to use the bone saw when a doctor needs to saw bones during surgery, most of the existing bone saws are electromechanical, but common handheld electric saws are unstable and have accidents, the bone saws needed by different people or different parts are different in size and are frequently replaced, the efficiency is low, broken blood and bone residues are easily collected during the bone sawing process, a splash-proof device can block the sight of the doctor, and the surgery cannot be completed perfectly.

Disclosure of Invention

The technical problem to be solved by the invention is to provide medical electric saw equipment for adjusting the diameter of the saw teeth according to the self weight of an object, and the medical electric saw equipment overcomes the problems.

The invention is realized by the following technical scheme.

The invention relates to medical electric saw equipment for adjusting the diameter of saw teeth according to the self weight of an object, which comprises a working box and a feeding cavity arranged in the working box, wherein a feeding hydraulic press is fixedly arranged at the bottom of the feeding cavity, a feeding cross rod is fixedly arranged on the upper side of the feeding hydraulic press, a feeding vertical rod is slidably arranged at the right end of the feeding cross rod, a feeding sliding cavity is arranged in the feeding vertical rod, a feeding screw shaft is rotatably arranged in the feeding sliding cavity, an inner spiral cavity is arranged at the right end of the feeding cross rod, the feeding screw shaft is slidably arranged in the inner spiral cavity, a micro-feeding motor is fixedly arranged in the feeding vertical rod and at the upper end of the feeding screw shaft, a motor shaft of the micro-feeding motor is fixedly arranged on the upper end surface of the feeding screw shaft, a belt wheel cavity is arranged at the right side in the feeding vertical rod, the saw blade is arranged in the saw blade cavity in a rotating mode, the left end of the saw blade shaft extends into the belt wheel cavity, a belt groove is fixedly formed in the part, extending into the belt wheel cavity, of the saw blade shaft, a cutting motor is fixedly arranged on the upper side of the feeding vertical rod, a driving belt wheel is fixedly arranged on a motor shaft of the cutting motor, the driving belt wheel and the belt groove are in transmission through a belt wheel cavity, an air compression transition cavity is fixedly arranged on the left side in the feeding vertical rod, the lower end of the air compression transition cavity is communicated with a gas conveying cavity, the lower end of the gas conveying cavity is provided with an expansion cavity of an expansion cavity ratchet mechanism, an expansion plate is arranged in the expansion cavity of the expansion cavity ratchet mechanism in a sliding mode, an expansion ball is arranged between the expansion plate and the upper wall of the expansion plate, a transition plate is arranged on the lower side of the expansion cavity ratchet mechanism, a linkage spring is arranged between the upper wall of the transition plate and the linkage rod, a spline shaft is fixedly arranged at the lower end of the linkage rod, a diameter motor is fixedly arranged at the left end of the spline shaft, a diameter shaft is rotatably arranged in the saw blade shaft, a rotating block is fixedly arranged at the right end of the diameter shaft, the rotating block is slidably arranged in an opening in the middle of the saw blade shaft, an extension plate is rotatably arranged in the transition plate, the rotating block is rotatably connected with the extension plate, a first diameter extension rod is rotatably arranged around the extension plate, a second diameter extension rod is rotatably arranged outside the first diameter extension rod, a cutting base is fixedly arranged outside the second diameter extension rod, a cutting blade is fixedly arranged outside the cutting base, a ratchet mechanism expansion cavity is fixedly arranged at the right side of the transition plate and used for controlling the adjusted diameter, and air compression cavity chutes are symmetrically and fixedly arranged at the front and the back of the right side of the, the pneumatic device is characterized in that a pneumatic box sliding block is arranged in the pneumatic cavity sliding groove in a sliding mode, a pneumatic box is arranged on the right side of the pneumatic box sliding block in a rotating mode, a pneumatic cavity is formed in the pneumatic box, a pneumatic plate is arranged in the pneumatic cavity in a sliding mode, a pneumatic bag is arranged between the pneumatic plate and the lower wall of the pneumatic cavity, a pneumatic hard pipe is fixedly arranged at the right end of the pneumatic bag, a hard pipe fixing block is fixedly arranged on the upper side of the working box, a pneumatic hose is arranged on a communicating pipeline on the left side of the hard pipe fixing block, and the pneumatic hose is communicated with the pneumatic transition.

Further, the fixed rotating base that is equipped with of board up end of calming anger, the rotating base internal rotation is equipped with the rotation axis, the fixed bolster that is equipped with of rotation axis upside, the fixed bolster inboard is fixed and is equipped with buffer material.

Further, the fixed baffle dead lever that is equipped with of symmetry around the work box upside, baffle dead lever internal rotation is equipped with the baffle axle, the epaxial fixed baffle connecting rod that is equipped with of baffle, the fixed clear glass that is equipped with in baffle connecting rod right side, the fixed glass board electric slide rail that is equipped with in clear glass front side, the electric slide rail of glass board slides and is equipped with the glass board telescopic link, the fixed glass board that is equipped with in glass board telescopic link left side is wiped, the fixed baffle motor shaft supporting shoe that is equipped with in baffle dead lever left side, the fixed baffle motor that is equipped with on the baffle motor shaft supporting shoe, the fixed baffle driving gear that is equipped with on the motor shaft of baffle motor, the epaxial fixed baffle driven gear that is equipped with of baffle, the baffle driven gear with.

Furthermore, a mirror is fixedly arranged on the right side of the working box, electric mirror guide rails are symmetrically and fixedly arranged on the front side and the rear side of the mirror, a mirror telescopic rod is slidably arranged in the electric mirror guide rails, and a mirror wiper is fixedly arranged on the mirror telescopic rod.

Furthermore, a feeding opening is formed in the right side of the working box, the feeding cross rod is slidably mounted in the feeding opening, and blocking cloth is arranged in the feeding opening.

The invention has the beneficial effects that: place this device behind the assigned position, with the position that the patient need perform the operation fixed back, this equipment can adjust the size of saw bit according to the weight at operation position, and garrulous blood meat and the bone sediment that splashes at the in-process of saw can be blocked by glass, can have garrulous blood meat and bone sediment to splash always when the operation, and equipment can continuously clear up glass, better for the doctor provides better field of vision, more accurate understanding operation condition.

Drawings

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

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

FIG. 2 is a schematic view of the structure at A-A in FIG. 1;

FIG. 3 is a schematic view of the structure at B-B in FIG. 1;

FIG. 4 is a schematic view of the cutting mechanism 200 of FIG. 1;

FIG. 5 is a schematic view of the structure of FIG. 2 at C;

FIG. 6 is a schematic view of the structure of FIG. 1 at D;

FIG. 7 is a schematic diagram of the structure at E in FIG. 4;

fig. 8 is a schematic view of the hanger F of fig. 5.

Detailed Description

The invention will now be described in detail with reference to fig. 1-8, wherein for ease of description the orientations described below are now defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

The medical electric saw device capable of adjusting the diameter of the saw teeth according to the self weight of an object, which is described in conjunction with the attached drawings 1-8, comprises a working box 10 and a feeding cavity 11 arranged in the working box 10, wherein a feeding hydraulic device 13 is fixedly arranged at the bottom of the feeding cavity 11, a feeding cross rod 31 is fixedly arranged at the upper side of the feeding hydraulic device 13, a feeding vertical rod 29 is slidably arranged at the right end of the feeding cross rod 31, a feeding sliding cavity 61 is arranged in the feeding vertical rod 29, a feeding screw shaft 64 is rotatably arranged in the feeding sliding cavity 61, an internal screw cavity 81 is arranged at the right end of the feeding cross rod 31, the feeding screw shaft 64 is slidably arranged in the internal screw cavity 81, a micro-feeding motor 62 is fixedly arranged in the feeding vertical rod 29 and at the upper end of the feeding screw shaft 64, a motor shaft of the micro-feeding motor 62 is fixedly arranged on the upper end surface, the lower side of the feeding vertical rod 29 is provided with a cutting mechanism 200, the cutting mechanism 200 comprises a saw blade cavity 82 arranged on the lower side of the feeding vertical rod 29, a saw blade shaft 76 is arranged in the saw blade cavity 82 in a rotating manner, the left end of the saw blade shaft 76 extends into the pulley cavity 56, a belt groove 78 is fixedly arranged on the part of the saw blade shaft 76 extending into the pulley cavity 56, a cutting motor 59 is fixedly arranged on the upper side of the feeding vertical rod 29, a driving pulley 58 is fixedly arranged on a motor shaft of the cutting motor 59, the driving pulley 58 and the belt groove 78 are transmitted through the belt pulley cavity 56, an air compression transition cavity 63 is fixedly arranged on the left side in the feeding vertical rod 29, the lower end of the air compression transition cavity 63 is communicated with an air conveying cavity 55, the lower end of the air conveying cavity 55 is provided with an expansion cavity ratchet mechanism expansion cavity 68, and an expansion plate 84 is slidably arranged in the, expansion plate 84 with be equipped with inflation ball 86 between the expansion plate 84 upper wall, inflation chamber ratchet wheel mechanism inflation chamber 68 downside intercommunication is equipped with cab apron 69, it is equipped with gangbar 85 to slide in the cab apron 69, gangbar 85 fixed mounting is in terminal surface under the expansion plate 84, cross cab apron 69 upper wall with be equipped with linkage spring 71 between the gangbar 85, the fixed integral key shaft 73 that is equipped with of gangbar 85 lower extreme, integral key shaft 73 left end is fixed and is equipped with diameter motor 74, rotate in the saw bit axle 76 and be equipped with diameter shaft 75, the fixed rotatory piece 83 that is equipped with of diameter shaft 75 right-hand member, rotatory piece 83 slidable mounting is in the opening at saw bit axle 76 middle part, cross cab apron 69 internal rotation and be equipped with extension board 87, rotatory piece 83 with extension board 87 rotates to be connected, extension board 87 rotates all around and is equipped with first diameter extension rod 51, the rotation is equipped with second diameter extension rod 88 in the first diameter extension rod 51 outside, the outer side of the second diameter extension rod 88 is fixedly provided with a cutting base 48, the outer side of the cutting base 48 is fixedly provided with a cutting edge 49, the right side of the transition plate 69 is fixedly provided with a ratchet mechanism expansion cavity 68, used for controlling the adjusted diameter, air pressure cavity sliding chutes 67 are symmetrically and fixedly arranged at the front and the back of the right side of the working box 10, a pneumatic box sliding block 66 is arranged in the pneumatic cavity sliding groove 67 in a sliding way, a pneumatic box 38 is arranged on the right side of the pneumatic box sliding block 66 in a rotating way, the air compression chamber 41 is arranged in the air compression box 38, the air compression plate 39 is arranged in the air compression chamber 41 in a sliding way, a gas pressing bag 42 is arranged between the gas pressing plate 39 and the lower wall of the gas pressing cavity 41, the right end of the gas pressing bag 42 is fixedly provided with a gas transmission hard pipe 12, the upper side of the working box 10 is fixedly provided with a hard tube fixing block 14, a communicating pipeline on the left side of the hard tube fixing block 14 is provided with an air hose 15, and the air hose 15 is communicated with the air compression transition cavity 63.

Beneficially, a rotating base 44 is fixedly arranged on the upper end face of the air pressing plate 39, a rotating shaft 43 is rotatably arranged in the rotating base 44, a fixing bracket 35 is fixedly arranged on the upper side of the rotating shaft 43, and a buffering material 36 is fixedly arranged on the inner side of the fixing bracket 35.

Beneficially, baffle fixing rods 19 are symmetrically fixed on the upper side of the working box 10 in a front-back manner, baffle shafts 21 are rotatably arranged in the baffle fixing rods 19, a baffle connecting rod 23 is fixedly arranged on the baffle shaft 21, transparent glass 24 is fixedly arranged on the right side of the baffle connecting rod 23, a glass plate electric slide rail 25 is fixedly arranged at the front side of the transparent glass 24, a glass plate telescopic rod 26 is arranged in the glass plate electric slide rail 25 in a sliding way, a glass eraser 27 is fixedly arranged at the left side of the glass plate telescopic rod 26, a baffle plate motor shaft supporting block 16 is fixedly arranged at the left side of the baffle plate fixing rod 19, a baffle motor 18 is fixedly arranged on the baffle motor shaft supporting block 16, a baffle driving gear 17 is fixedly arranged on a motor shaft of the baffle motor 18, the baffle shaft 21 is fixedly provided with a baffle driven gear 22, and the baffle driven gear 22 and the baffle driving gear 17 are in meshing transmission.

Beneficially, a mirror 33 is fixedly arranged on the right side of the work box 10, mirror electric guide rails 91 are symmetrically and fixedly arranged on the front and back sides of the mirror 33, a mirror telescopic rod 92 is slidably arranged in the mirror electric guide rails 91, and a mirror wiper 32 is fixedly arranged on the mirror telescopic rod 92.

Advantageously, the right side of the work box 10 is provided with a feed opening 34, the feed crossbar 31 is slidably mounted in the feed opening 34, and the feed opening 34 is provided with a blocking cloth 46.

The working steps are as follows: initial state: the transparent glass 24 is positioned at the upper side of the working box 10 and is not covered at the right side of the working box 10, the feeding hydraulic press 13 is in an extending state, the cutting mechanism 200 is positioned at the farthest distance from the fixed bracket 35, and the glass eraser 27 is positioned at the uppermost part; the part of a patient needing operation is placed in the buffer material 36, the buffer layer can protect the part around the operation of the patient, a doctor can separate the air compression boxes 38 which are symmetrical front and back according to the condition of the operation part, the air compression boxes 38 can rotate around the air compression box sliding blocks 66, the fixed support 35 can rotate in the rotating base 44 through the rotating shaft 43, the doctor can carry out different combined counteroperations according to different conditions, the adjustable back baffle motor 18 is started, the baffle motor 18 drives the baffle driving gear 17 to rotate, the baffle driving gear 17 is meshed with the baffle driven gear 22 for transmission, the baffle driven gear 22 drives the baffle connecting rod 23 to rotate downwards, when the baffle connecting rod 23 is parallel, the fixed support 35 stops, the fixed support 35 is pressed downwards by the gravity of the part of the patient, the fixed support 35 moves downwards under the force, the fixed support 35 presses the air compression plate 39 downwards, the air compression plate 39 presses the air bag 42 downwards, the air bag 42 is forced to convey the air in the air compressing transition cavity 63 through the air conveying hard tube 12 and the air conveying hose 15, the air enters the expansion ball 86 through the air compressing transition cavity 63 and the air conveying cavity 55, the air input into the expansion ball 86 expands to push the expansion plate 84 downwards, the expansion plate 84 drives the spline shaft 73 to move downwards, the spline shaft 73 is connected with the motor shaft of the diameter motor 74 and the diameter shaft 75, the diameter motor 74 drives the diameter shaft 75 to rotate, the diameter shaft 75 rotates in the saw blade shaft 76, the diameter shaft 75 drives the rotating block 83 to rotate, the rotating block 83 drives the extension plate 87 to rotate, the extension plate 87 drives the first diameter extension rod 51 to rotate, the first diameter extension rod 51 rotates to drive the second diameter rod 88 to contract towards the center or extend towards the outside, according to the weight of the part of a patient needing operation, as the larger the weight of the bone is, the larger the diameter of the bone is required to be cut, and the, the expansion cavity ratchet mechanism 68 is started to clamp the extension plate 87, the cutting motor 59 is started, the cutting motor 59 drives the driving belt wheel 58 to rotate, the driving belt wheel 58 drives the saw blade shaft 76 to rotate through 57, the saw blade shaft 76 drives the transition plate 69 to rotate, the transition plate 69 drives the second diameter extension rod 88 to rotate, the second diameter extension rod 88 drives the cutting base 48 and the cutting edge 49 to rotate, the feeding hydraulic press 13 is started to contract downwards, the feeding hydraulic press 13 drives the feeding cross rod 31 and the feeding vertical rod 29 to move downwards for cutting, the feeding hydraulic press 13 is stopped when micro-feeding is needed, the micro-feeding motor 62 is started, the micro-feeding motor 62 drives the feeding screw shaft 64 to rotate, the feeding screw shaft 64 drives the inner screw cavity 81 to rotate, the inner screw cavity 81 is driven by force, when an operation is performed, a doctor can see the operation condition through the transparent glass 24, when the condition on the left side of the cutting mechanism 200 needs to be known, the mirror image in the mirror, due to the fact that broken bones and blood can be splashed out during cutting, the broken bones and broken meat can be adhered to the mirror 33 or the transparent glass 24, at the moment, the electric mirror guide rail 91 is started, the electric mirror guide rail 91 drives the telescopic mirror rod 92 to move downwards, the telescopic mirror rod 92 drives the mirror rod 32 to move downwards, bone residues and blood stains on the mirror 33 are scraped off by the mirror rod 32, the electric glass plate sliding rail 25 is started, the electric glass plate sliding rail 25 drives the telescopic glass plate rod 26 to move downwards, the telescopic glass plate rod 26 drives the glass plate eraser 27 to move downwards to scrape off the bone residues and the blood stains on the transparent glass 24, doctors can know the condition of an operation more clearly, the bone residues and the blood stains can be splashed after cleaning is finished, the telescopic mirror rod 92 and the telescopic glass plate rod 26 can extend, the electric mirror guide rail 91 and the electric glass plate sliding rail 25 can drive the electric glass.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A medical electric saw device for adjusting the diameter of a saw tooth according to the self weight of an object comprises a work box and a feeding cavity arranged in the work box, and is characterized in that: the feeding mechanism comprises a feeding vertical rod, a feeding sliding cavity is arranged in the feeding vertical rod, a feeding screw shaft is arranged in the feeding sliding cavity in a rotating mode, an inner spiral cavity is arranged at the right end of the feeding horizontal rod, the feeding screw shaft is arranged in the inner spiral cavity in a sliding mode, a micro-feeding motor is fixedly arranged at the upper end of the feeding screw shaft in the feeding vertical rod and at the upper end of the feeding screw shaft, a belt wheel cavity is arranged at the right side in the feeding vertical rod, a cutting mechanism is arranged at the lower side of the feeding vertical rod and comprises a saw blade cavity arranged at the lower side of the feeding vertical rod, a saw blade shaft is arranged in the saw blade cavity in a rotating mode, and the left end of the saw blade shaft extends into the belt wheel cavity, the saw blade shaft is fixedly provided with a belt pulley groove in the part extending into the belt pulley cavity, the upper side of the feeding vertical rod is fixedly provided with a cutting motor, a motor shaft of the cutting motor is fixedly provided with a driving belt pulley, the driving belt pulley and the belt pulley groove are driven by a belt pulley cavity, the inner left side of the feeding vertical rod is fixedly provided with an air compression transition cavity, the lower end of the air compression transition cavity is communicated with a gas transmission cavity, the lower end of the gas transmission cavity is provided with an expansion cavity ratchet mechanism expansion cavity, an expansion plate is arranged in the expansion cavity of the expansion cavity ratchet mechanism in a sliding manner, an expansion ball is arranged between the expansion plate and the upper wall of the expansion plate, the lower side of the expansion cavity ratchet mechanism expansion cavity is communicated with a transition plate, a linkage rod is arranged in the transition plate in a sliding manner, the linkage rod is fixedly arranged on the lower end face of the, the lower end of the linkage rod is fixedly provided with a spline shaft, the left end of the spline shaft is fixedly provided with a diameter motor, a diameter shaft is rotatably arranged in the saw blade shaft, the right end of the diameter shaft is fixedly provided with a rotating block, the rotating block is slidably arranged in an opening in the middle of the saw blade shaft, an extending plate is rotatably arranged in the extending plate, the rotating block is rotatably connected with the extending plate, the extending plate is rotatably provided with a first diameter extending rod, the outer side of the first diameter extending rod is rotatably provided with a second diameter extending rod, the outer side of the second diameter extending rod is fixedly provided with a cutting base, the outer side of the cutting base is fixedly provided with a cutting blade, the right side of the extending plate is fixedly provided with a ratchet mechanism expansion cavity for controlling the adjusted diameter, the front side and the back side of the working box are symmetrically and fixedly provided with air compression cavity chutes, and air compression box, the right side of the air compression box sliding block is rotatably provided with an air compression box, an air compression cavity is arranged in the air compression box, an air compression plate is arranged in the air compression cavity in a sliding mode, an air compression bag is arranged between the air compression plate and the lower wall of the air compression cavity, the right end of the air compression bag is fixedly provided with an air conveying hard pipe, the upper side of the working box is fixedly provided with a hard pipe fixing block, the left side of the hard pipe fixing block is communicated with a pipeline, and the air conveying soft pipe is communicated with the air compression transition cavity.

2. The medical electric saw device for adjusting the diameter of the saw teeth according to the self weight of the subject as set forth in claim 1, wherein: the air compressing plate is characterized in that a rotary base is fixedly arranged on the upper end face of the air compressing plate, a rotary shaft is arranged in the rotary base in a rotating mode, a fixed support is fixedly arranged on the upper side of the rotary shaft, and a buffer material is fixedly arranged on the inner side of the fixed support.

3. The medical electric saw device for adjusting the diameter of the saw teeth according to the self weight of the subject as set forth in claim 1, wherein: the glass plate cleaning machine is characterized in that baffle fixing rods are symmetrically and fixedly arranged on the front side and the back side of the upper side of the working box, baffle shafts are arranged in the baffle fixing rods, baffle connecting rods are fixedly arranged on the baffle shafts, transparent glass is fixedly arranged on the right sides of the baffle connecting rods, glass plate electric slide rails are fixedly arranged on the front sides of the transparent glass, glass plate telescopic rods are slidably arranged in the glass plate electric slide rails, glass plate wipers are fixedly arranged on the left sides of the glass plate telescopic rods, baffle motor shaft supporting blocks are fixedly arranged on the left sides of the baffle fixing rods, baffle motors are fixedly arranged on the baffle motor shaft supporting blocks, baffle driving gears are fixedly arranged on the motor shafts of the baffle motors, baffle driven gears are fixedly arranged on the baffle shafts, and the baffle.

4. The medical electric saw device for adjusting the diameter of the saw teeth according to the self weight of the subject as set forth in claim 1, wherein: the mirror is fixedly arranged on the right side of the working box, the mirror electric guide rails are symmetrically and fixedly arranged on the front side and the rear side of the mirror, a mirror telescopic rod is slidably arranged in the mirror electric guide rails, and a mirror wiper is fixedly arranged on the mirror telescopic rod.

5. The medical electric saw device for adjusting the diameter of the saw teeth according to the self weight of the subject as set forth in claim 1, wherein: the right side of the working box is provided with a feeding port, the feeding cross rod is slidably mounted in the feeding port, and blocking cloth is arranged in the feeding port.