CN215514303U

CN215514303U - Double-chain conveyor

Info

Publication number: CN215514303U
Application number: CN202121137169.3U
Authority: CN
Inventors: 王新云; 柳先知; 徐伟
Original assignee: Qingdao Haikejia Intelligent Equipment Technology Co ltd
Current assignee: Qingdao Haikejia Intelligent Technology Co ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2022-01-14
Anticipated expiration: 2031-05-26

Abstract

A double-chain conveyor comprises a rack, and a rear scraper straightening part, a front scraper aligning part, a planet structure adjusting part, a crank arm part and a fine dried noodle conveying part which are arranged on the rack. A fine dried noodle conveying part for conveying the bulk fine dried noodles back and forth is arranged at the top of the machine frame; the upper part of the front end of the frame is provided with a front scraper alignment part; a rear scraper smoothing part is arranged behind the front scraper alignment part; the planetary structure adjusting part is arranged below the front scraper head aligning part, and the crank arm part is arranged on one side below the rear scraper straightening part and the front scraper head aligning part. The utility model has the advantages that: the straightening function is realized by utilizing the rear scraper straightening part, and the problem of disordered arrangement in the conveying process is solved; the front scraper head aligning part is used for aligning the end face of the noodle when the noodle conveying is finished, so that the problem of uneven end face is solved; the planetary structure adjusting part realizes the adjustment of specifications, is suitable for noodles of various specifications, achieves multiple purposes and solves the problem of single machine type.

Description

Double-chain conveyor

Technical Field

The utility model relates to fine dried noodle production equipment, in particular to a double-chain conveyor which is used for straightening and aligning end faces during conveying of bulk fine dried noodles, and belongs to the technical field of food conveying machinery.

Background

The final process in the production process of the dried noodles is as follows: the bulk fine dried noodles are sorted by a conveying mechanism, and the like (after being integrated from a plurality of production devices), and then are conveyed to a material inlet of a plastic packaging fine dried noodle bagging machine for subsequent packaging into packages. Conveying mechanism in the existing market is realized mainly by simple chain belt transmission, only carries the function, does not have functions such as arrangement, reason in order, neat, function, and the function is more single, and produces static in the transportation and lead to the upper strata strip to arrange irregularly, and the transportation still can lead to the terminal surface uneven if the speed is too fast, and efficiency is very low, and is also pleasing to the eye. If a set of equipment is added independently, the problems are solved and the manufacturing cost is extremely high.

Disclosure of Invention

The utility model provides a double-chain conveyor to solve the problems in the prior art.

The technical scheme of the utility model is as follows: a double-chain conveyor comprises a rack, and a rear scraper straightening part, a front scraper aligning part, a planet structure adjusting part, a crank arm part and a fine dried noodle conveying part which are arranged on the rack. A fine dried noodle conveying part for conveying the bulk fine dried noodles forwards and backwards is arranged between the front end and the rear end of the top of the rack; the upper part of the front end of the frame is provided with a front scraper alignment part; a rear scraper smoothing part is arranged behind the front scraper alignment part; the planet structure adjusting part is arranged below the front scraper head aligning part, and the crank arm part is arranged at one side below the rear scraper straightening part and the front scraper head aligning part.

The utility model has the advantages that: the straightening function is realized by utilizing the rear scraper straightening part, and the problem of disordered arrangement in the conveying process is solved; the front scraper head aligning part is used for aligning the end face of the noodle when the noodle conveying is finished, so that the problem of uneven end face is solved; the planetary structure adjusting part realizes the adjustment of specifications, is suitable for noodles of various specifications, achieves multiple purposes and solves the problem of single machine type.

Drawings

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

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a left side view of FIG. 1;

fig. 4 is a schematic side sectional view of the frame and noodle transport section of the present invention;

FIG. 5 is a left side view of FIG. 1;

FIG. 6 is a front view of the rear screed configuration of the present invention;

FIG. 7 is a left side view of FIG. 6;

FIG. 8 is a front elevational view of the front screed configuration of the present invention;

FIG. 9 is a top view of FIG. 8;

FIG. 10 is a front elevational view of the planet structure adjustment portion of the present invention;

FIG. 11 is a right side view of FIG. 10;

FIG. 12 is a front view of the crank arm construction of the present invention;

fig. 13 is a left side view of fig. 12.

Description of reference numerals: 1. the device comprises a frame, a rear scraper straightening part, a front scraper head-aligning part, a planetary structure adjusting part, a crank arm part and a rear scraper straightening part, wherein the frame 2 is connected with the rear scraper straightening part through a connecting rod 3; 6. a dried noodle conveying part.

Detailed Description

Referring to fig. 1-3, the utility model relates to a double-chain conveyor, which comprises a frame 1, a rear scraper smoothing part 2, a front scraper alignment part 3, a planetary structure adjusting part 4, a crank arm part 5 and a fine dried noodle conveying part 6, wherein the rear scraper smoothing part 2, the front scraper alignment part 3, the planetary structure adjusting part 4 and the fine dried noodle conveying part 6 are arranged on the frame 1. A fine dried noodle conveying part 6 for conveying the bulk fine dried noodles back and forth is arranged between the front end and the rear end of the top of the frame 1; the upper part of the front end of the frame 1 is provided with a front scraper alignment part 3; a rear scraper smoothing part 2 is arranged behind the front scraper alignment part 3; a planetary structure adjusting part 4 is arranged below the front scraper alignment part 3, and a crank arm part 5 is arranged at one side below the rear scraper straightening part 2 and the front scraper alignment part 3. The planet structure adjusting part 4 and the crank arm part 5 are a whole set of independent mechanisms and are positioned at the left end of the whole machine, wherein the planet structure adjusting part 4 penetrates through two sides of the left end of the whole machine.

Referring to fig. 4 and 5, the noodle transport section 6 comprises: 4-7 parts of front chain wheel, 6-1 parts of rear chain wheel, 6-2 parts of push surface groove baffle plates, 6-3 parts of scraping plates, 6-4 parts of motor, 6-5 parts of guide sliding rail, 6-6 parts of aluminum profile tiling pad rail, 6-7 parts of small guide chain wheel and 6-8 parts of chain. Two coaxial front chain wheels 4-7 and two coaxial rear chain wheels 6-1 are respectively arranged at the front end and the rear end of the frame 1, the small guide chain wheels 6-7 are arranged above the front chain wheels 4-7, and chains 6-8 are encircled between the front chain wheels and the rear chain wheels. The output shaft of the motor 6-4 drives the chain 6-8 to run through the chain transmission mechanism. The motor 6-4 is arranged at the front part in the middle of the rack 1 and is the main power of the fine dried noodle conveying part 6. The chain 6-8 is provided with scrapers 6-3 at equal intervals, the upper surfaces of the frames 1 at the two ends of the scrapers 6-3 are provided with push groove baffles 6-2, and a U-shaped conveying groove from back to front is formed on the chain 6-8. A C-shaped guide sliding rail 6-5 is arranged in front of the front chain wheel 4-7 on one side and used for guiding the scraper 6-3 when changing direction from top to bottom. An aluminum profile tiled pad rail 6-6 is arranged below the chain 6-8 and used for preventing the scraper 6-3 from swinging when returning.

Referring to fig. 6 and 7, the rear squeegee fairing section 2 includes: the device comprises a supporting plate 2-1, a rear scraper optical axis 2-2, a rear scraper 2-4, a silica gel plate 2-5, a hinge 2-6 and an optical axis sleeve 2-7. The bottom ends of two support plates 2-1 which are arranged symmetrically left and right are fixed at the front part of the frame 1 and are positioned at the outer side of the push surface groove baffle 6-2 (see figure 2). A support rod is connected between the top ends of the two support plates 2-1 (the support rod comprises a screw rod 2-3 and a sleeve 2-8, and two ends of the screw rod 2-3 penetrate through two ends of the sleeve 2-8, penetrate through the two support plates 2-1 and are fastened with the support plates 2-1 by nuts). Two ends of the optical axis 2-2 of the rear scraper are rotatably supported between the two support plates 2-1 and are positioned below the screw rod 2-3; two ends of the optical axis sleeve 2-7 are respectively rotatably installed on the rear scraper optical axis 2-2 through a flange shaft sleeve 2-9, and the rear end of the rear scraper 2-4 is fixed on the optical axis sleeve 2-7 (the flange shaft sleeve 2-9 is made of wear-resistant materials and plays the role of a sliding bearing); a silica gel plate 2-5 is fixed at the front end of the rear scraper 2-4 by bolts; one end of a hinge 2-6 is fixed on the rear scraper driving shaft 2-2, the inner side of the other end of the hinge 2-6 is connected with a poke rod 2-10 for poking the rear scraper 2-4 upwards, and the outer side of the other end of the hinge 2-6 is in transmission connection with an adjusting connecting rod 5-1 of the crank arm part 5 through a lengthened screw. The rear scraper optical axis 2-2 and the optical axis sleeve 2-7 can rotate mutually, the scraper optical axis 2-2 can also rotate, and the working mode is as follows: the hinges 2-6 are driven to swing through the corresponding adjusting connecting rods 5-1, and when the hinges 2-6 swing upwards, the poke rods 2-10 (the positions are shown in figure 6) on the hinges 2-6 directly lift the rear scraping plates 2-4 and the optical axis sleeves 2-7 to swing together; when the hinge 2-6 swings downwards, the poke rod 2-10 descends to be separated from the rear scraping plate 2-4, and the rear scraping plate 2-4 and the optical axis sleeve 2-7 automatically descend under the action of gravity and fall above the noodles to smooth the surfaces of the noodles.

Referring to fig. 8 and 9, the front blade flush portion 3 includes: the device comprises support frames 3-1, front scraper blade optical shafts 3-3, long pin shafts 3-4, front baffles 3-5, small crank arms 3-6, pin shafts 3-7, flange sleeves 3-8, rotating pipes 3-9 and support rods, wherein the bottom ends of the two support frames 3-1 are fixed on two sides of the front end of a frame 1 and respectively correspond to the support plates 2-1 on the two sides. A supporting rod (comprising a sleeve 3-10 and a screw rod 3-2, and having the same structure as the supporting rod of the rear scraper straightening part 2) is connected between the tops of the two supporting frames 3-1; a front scraper optical axis 3-3 is rotatably supported between two support frames 3-1 below the support rod, and two ends of a rotating pipe 3-9 are rotatably mounted on the front scraper optical axis 3-3 through a flange sleeve 3-8 respectively (the flange sleeve 3-8 and the flange sleeve 2-9 have the same structure and function). One end of the front scraper optical axis 3-3 is fixedly connected with the upper end of an L-shaped small crank arm 3-6, the lower end of the small crank arm 3-6 is connected with a pin shaft 3-7, and a side plate 3-12 is welded on the side surface of the small crank arm 3-6. The rear end of a front baffle 3-5 is welded on the sleeve 3-9, the front part of the front baffle 3-5 inclines downwards, a long pin shaft 3-4 is welded on the upper part of the front baffle 3-5, and a first spring 3-11 is connected between the long pin shaft 3-4 and the pin shaft 3-7. When the corresponding adjusting connecting rod 5-1 drives the small crank arm 3-6 to swing upwards, the side plate 3-12 can directly support the front baffle 3-5 to move upwards; when the small crank arm 3-6 swings downwards, the side plate 3-12 is separated from the rear scraping plate 2-4, but the pin shaft 3-7 connected with the lower end of the small crank arm 3-6 pulls the long pin shaft 3-4 through the first spring 3-11, so that the rear scraping plate 2-4 descends; the back scraper 2-4 is beaten to the noodle end face after falling to the lowest point, the elasticity of the first spring 3-11 ensures that the noodle end face is leveled, and the noodle is not crushed due to excessive force.

Referring to fig. 10 and 11, the planetary structure adjusting part 4 includes: 4-1 parts of stepped shaft, 4-2 parts of pinion, 4-3 parts of gear bearing sleeve, 4-4 parts of bakelite hand wheel, 4-5 parts of fixed column, 4-6 parts of bearing seat flange, 4-8 parts of detection induction spacer, 4-9 parts of spacer, 4-10 parts of large cam, 4-11 parts of small cam, 4-12 parts of fixed seat, 4-13 parts of bearing cover, 4-14 parts of planetary gear, 4-15 parts of connecting column, 4-16 parts of right-handed screw rod seat, 4-17 parts of double-handed screw rod, 4-18 parts of left-handed screw rod seat and 4-19 parts of driving chain wheel.

The stepped shaft 4-1 is arranged at the lower part of the front end of the frame 1 (as shown in figure 1, right below the front scraper flush part 3) through two groups of bearing seat flanges 4-6. At one end of the stepped shaft 4-1, a small cam 4-11 and a large cam 4-10 are installed in sequence from left to right (as shown in fig. 10). The pinion 4-2 is fixed at the other end of the stepped shaft 4-1, the gear bearing sleeve 4-3 and the driving chain wheel 4-19 are fixed together through bolts, and then two groups of bearings are arranged on the stepped shaft 4-1. The fixed seat 4-12 and the bearing cover 4-13 are fixed through bolts, and the fixed seat and the bearing cover are installed outside the gear bearing sleeve 4-3 through a deep groove ball bearing. The shaft of the planet gear 4-14 is rotatably mounted on the outer side of the fixed seat 4-12 through a bearing. The driving chain wheels 4-19 drive the gear bearing sleeves 4-3 to rotate, the gear bearing sleeves 4-3 are in gear engagement transmission with the planet gears 4-14, the planet gears 4-14 are in gear engagement transmission with the pinion gears 4-2, and the pinion gears 4-2 drive the stepped shafts 4-1 to rotate through keys. Three groups of gears, namely a gear bearing sleeve 4-3, a planetary gear 4-14 and a pinion 4-2, form a simple planetary mechanism. One end of the double-rotation-direction threaded rod 4-17 is matched and arranged in a threaded hole of the right-rotation screw rod seat 4-16, and the right-rotation screw rod seat 4-16 is fixed on the frame 1 through the fixing column 4-5. The other end of the double-screwing-direction threaded rod 4-17 is matched and arranged in a threaded hole of a left-screwing-direction threaded rod seat 4-18, and the left-screwing-direction threaded rod seat 4-18 is fixed on a fixed seat 4-12; one end of the double-screwing-direction threaded rod 4-17 is connected with the bakelite handwheel 4-4 through a coaxial connecting column 4-15. A bakelite hand wheel 4-4 is manually rotated, a fixed seat 4-12 is driven to rotate around a stepped shaft 4-1 through a double-rotation-direction threaded rod 4-17, so that a planetary mechanism consisting of three groups of gears, namely a gear bearing sleeve 4-3, a planetary gear 4-14 and a pinion 4-2, changes the relative direction, changes the circumferential direction position of the stepped shaft 4-1, changes the starting point of a cam and plays a role in regulating specifications. Two front chain wheels 4-7 are arranged in the middle of the stepped shaft 4-1 and positioned between two groups of bearing seat flanges 4-6, and a spacer 4-9 is arranged on the stepped shaft 4-1 between the bearing seat flange 4-6 and the front chain wheel 4-7 on the same side; a plurality of detection induction spacer bushes 4-8 are arranged on the stepped shaft 4-1 between the two front chain wheels 4-7; a driving chain wheel 4-19 is arranged on the stepped shaft 4-1 between the bearing seat flange 4-6 and the fixed seat 4-12 on one side and is used for being in transmission connection with an output shaft of the motor 6-4.

Referring to fig. 12 and 13, the crank arm part 5 comprises two sets of adjusting connecting rods 5-1, a crank arm 5-2, a deep groove ball bearing 5-3 and a second spring 5-4. The two sets of crank arms 5-2 are arranged up and down, the crank arms 5-2 play the role of a lever, the pivots of the crank arms are respectively connected to one side of the rack 1 (see figure 1) through second springs 5-4 and bearings in a rotating way, and the top ends of the lower set of crank arms 5-2 are hinged to the other end of the hinge 2-6 of the rear scraper straightening part 2 through corresponding adjusting connecting rods 5-1; the bottom end of the lower crank arm 5-2 is provided with a deep groove ball bearing 5-3, and the lower deep groove ball bearing 5-3 corresponds to the small cam 4-11 of the planet structure adjusting part 4. The top end of the upper set of crank arms 5-2 is hinged with the small crank arms 3-6 of the front scraper flush part 3 through another adjusting connecting rod 5-1, the bottom end of the upper crank arm 5-2 is also provided with a deep groove ball bearing 5-3, and the lower deep groove ball bearing 5-3 corresponds to the large cam 4-10 of the planet structure adjusting part 4.

When the utility model is applied, the left end of the utility model corresponds to a material inlet of the noodle flat bag bagging device, and the working process is explained as follows (the front end of the utility model refers to the left side in fig. 1):

the motor 6-4 drives the planetary mechanism through the chain transmission mechanism (comprising a driving gear, a driving chain and a driving chain wheel 4-19 on the output shaft of the motor), so as to drive the stepped shaft 4-1 to rotate, the stepped shaft 4-1 drives the conveying chain of the noodle conveying part 6 through the front chain wheel 4-7, so that the scraper 6-3 pushes the noodles to slide forwards along the noodle pushing groove baffle 6-2, and the scraper 6-3 firstly passes through the rear scraper straightening part 2. The small cam 4-11 rotates under the synchronous motion of the stepped shaft 4-1; the lower deep groove ball bearing 5-3 rolls on the surface of the small cam 4-11 under the action of the second spring 5-4 to drive the crank arm 5-2 to swing and drive the hinge 2-6 to swing through the adjusting connecting rod 5-1, thereby realizing the rising and falling movement of the rear scraping plate 2-4. The distance between the silica gel plate 2-5 and the baffle 6-2 of the push surface groove can be adjusted through the adjusting connecting rod 5-1. The silica gel plate 2-5 is made of wear-resistant silica gel, can float on the surface of the transported fine dried noodles, and has the function of straightening the order of the fine dried noodles on the surface.

The squeegee 6-3 continues to move forward to reach the front squeegee flush portion 3. Similarly, the large cam 4-10 rotates under the synchronous driving of the stepped shaft 4-1, the deep groove ball bearing 5-3 rolls on the surface of the large cam 4-10 in an undulated mode to drive the crank arm 5-2 to swing, and the small crank arm 3-6 is driven to swing through the adjusting connecting rod 5-1, so that the lifting movement of the front baffle 3-5 is achieved. Due to the action of the large cam 4-10 (designing the shape according to requirements), the front baffle 3-5 falls at the moment when the end face of the fine dried noodles runs to the position, the end face of the fine dried noodles is beaten up and then is rapidly lifted up, and the noodle aligning effect is achieved while the conveying of the fine dried noodles is not influenced.

The pinion gear 4-2, the gear bearing housing 4-3 and the planetary gears 4-14 of the planetary structure adjusting portion 4 together constitute a simplified planetary structure, as shown in fig. 10. A bakelite hand wheel 4-4 is manually rotated, a fixed seat 4-12 is driven to rotate around a stepped shaft 4-1 by adjusting a double-rotation-direction threaded rod 4-17, so that a planetary mechanism consisting of three groups of gears, namely a gear bearing sleeve 4-3, a planetary gear 4-14 and a pinion 4-2, changes the relative direction, finally changes the position of the circumferential direction of the stepped shaft 4-1, changes the starting point of a cam, and controls the falling point of a rear scraping plate 2-4 and a front baffle plate 3-5 to adapt to fine dried noodles with corresponding length specifications, thereby achieving the adjusting function.

The direction of the scraping plate 6-3 is changed by the guide sliding rail 6-5 from top to bottom, and then the scraping plate returns from left to right along the aluminum profile tiling backing rail 1-6 to form circulation.

Claims

1. A double-chain conveyor is characterized by comprising a rack (1), a rear scraper straightening part (2), a front scraper head aligning part (3), a planet structure adjusting part (4), a crank arm part (5) and a fine dried noodle conveying part (6) which are arranged on the rack (1), wherein the fine dried noodle conveying part (6) for conveying bulk fine dried noodles forwards and backwards is arranged between the front end and the rear end of the top of the rack (1); the upper part of the front end of the frame (1) is provided with a front scraper alignment part (3); a rear scraper smoothing part (2) is arranged behind the front scraper alignment part (3); a planet structure adjusting part (4) is arranged below the front scraper alignment part (3), and a crank arm part (5) is arranged at one side below the rear scraper straightening part (2) and the front scraper alignment part (3).

2. A double chain conveyor according to claim 1, wherein said noodle conveying portion (6) comprises: the aluminum profile pushing device comprises front chain wheels (4-7), rear chain wheels (6-1), pushing groove baffles (6-2), scrapers (6-3), motors (6-4), guide sliding rails (6-5), aluminum profile tiling pad rails (6-6), small guide chain wheels (6-7) and chains (6-8), wherein the two coaxial front chain wheels (4-7) and the two coaxial rear chain wheels (6-1) are respectively installed at the front end and the rear end of a rack (1), the small guide chain wheels (6-7) are installed above the front chain wheels (4-7), and the chains (6-8) are encircled between the front chain wheels (4-7) and the rear chain wheels (6-1); the motor (6-4) is arranged at the front part of the middle of the frame (1), and an output shaft of the motor (6-4) drives the chain (6-8) to run through a chain transmission mechanism; the chain (6-8) is connected with scrapers (6-3) at equal intervals, the upper surfaces of the racks (1) at the two ends of the scrapers (6-3) are provided with face pushing groove baffles (6-2), and a U-shaped conveying groove from back to front is formed on the chain (6-8); a C-shaped guide sliding rail (6-5) is arranged in front of the front chain wheel (4-7) on one side and used for guiding the scraper (6-3) when the direction is changed from top to bottom; an aluminum profile tiling pad rail (6-6) for preventing the scraper (6-3) from swinging when returning is arranged below the chain (6-8).

3. The double chain conveyor of claim 2, wherein the rear screed fairing section (2) comprises: the bottom ends of two support plates (2-1) which are arranged in bilateral symmetry are fixed at the front part of the frame (1) and are positioned at the outer side of the push surface groove baffle (6-2); a supporting rod is connected between the top ends of the two supporting plates (2-1); two ends of the optical axis (2-2) of the rear scraper are rotatably supported between the two support plates (2-1) and are positioned below the screw rod (2-3); two ends of the optical axis sleeve (2-7) are rotatably arranged on the rear scraper optical axis (2-2) through a flange shaft sleeve (2-9), and the rear end of the rear scraper (2-4) is fixed on the optical axis sleeve (2-7); a silica gel plate (2-5) is fixed at the front end of the rear scraper (2-4) by bolts; one end of the hinge (2-6) is fixed on the optical axis (2-2) of the rear scraper, the inner side of the other end of the hinge (2-6) is connected with a poke rod (2-10) used for poking the rear scraper (2-4) upwards, and the outer side of the other end of the hinge (2-6) is in transmission connection with one end of the crank arm part (5).

4. A double chain conveyor according to claim 3, wherein said front scraper flush section (3) comprises: the device comprises support frames (3-1), front scraper blade optical axes (3-3), long pin shafts (3-4), front baffles (3-5), small crank arms (3-6), pin shafts (3-7), flange sleeves (3-8), rotating pipes (3-9) and support rods, wherein the bottom ends of the two support frames (3-1) are fixed on two sides of the front end of a rack (1) and respectively correspond to the support plates (2-1) on the two sides; a supporting rod is connected between the tops of the two supporting frames (3-1); a front scraper optical axis (3-3) is rotatably supported between two support frames (3-1) below the support rod, and two ends of a rotating pipe (3-9) are rotatably installed on the front scraper optical axis (3-3) through a flange sleeve (3-8); one end of the front scraper optical axis (3-3) is fixedly connected with the upper end of an L-shaped small crank arm (3-6), the lower end of the small crank arm (3-6) is connected with a pin shaft (3-7), and a side plate (3-12) is welded on the side surface of the small crank arm (3-6); the rear end of a front baffle (3-5) is welded on the rotating pipe (3-9), the front part of the front baffle (3-5) is inclined downwards, a long pin shaft (3-4) is welded on the upper part of the front baffle (3-5), and a first spring (3-11) is connected between the long pin shaft (3-4) and the pin shaft (3-7).

5. The double chain conveyor according to claim 2, wherein said planetary structure adjusting portion (4) comprises: the device comprises a stepped shaft (4-1), a pinion (4-2), a gear bearing sleeve (4-3), a bakelite hand wheel (4-4), a fixing column (4-5), a bearing seat flange (4-6), a detection induction spacer sleeve (4-8), a spacer sleeve (4-9), a large cam (4-10), a small cam (4-11), a fixing seat (4-12), a bearing cover (4-13), a planetary gear (4-14), a connecting column (4-15), a right-handed screw rod seat (4-16), a double-handed threaded rod (4-17), a left-handed screw rod seat (4-18) and a driving chain wheel (4-19), wherein the stepped shaft (4-1) is arranged at the lower part of the front end of a rack (1) through two groups of bearing seat flanges (4-6); a small cam (4-11) and a large cam (4-10) are sequentially arranged at one end of the stepped shaft (4-1) from left to right; the pinion (4-2) is arranged at the other end of the stepped shaft (4-1), the gear bearing sleeve (4-3) and the driving chain wheel (4-19) are fixed together through bolts, and then two groups of bearings are arranged on the stepped shaft (4-1); the fixed seat (4-12) and the bearing cover (4-13) are connected with each other through bolts and then are arranged outside the gear bearing sleeve (4-3) through a deep groove ball bearing; the shaft of the planetary gear (4-14) is rotatably arranged at the outer side of the fixed seat (4-12) through a bearing; the driving chain wheel (4-19) drives the gear bearing sleeve (4-3) to rotate, the gear bearing sleeve (4-3) is in gear engagement transmission with the planetary gear (4-14), the planetary gear (4-14) is in gear engagement transmission with the pinion (4-2), and the pinion (4-2) drives the stepped shaft (4-1) to rotate through a key; three groups of gears, namely a gear bearing sleeve (4-3), a planetary gear (4-14) and a pinion (4-2), form a simple planetary mechanism; one end of the double-rotation-direction threaded rod (4-17) is matched and arranged in a threaded hole of the right-rotation screw rod seat (4-16), and the right-rotation screw rod seat (4-16) is fixed on the rack (1) through a fixing column (4-5); the other end of the double-screwing-direction threaded rod (4-17) is matched and arranged in a screw hole of a left-screwing-direction screw rod seat (4-18), and the left-screwing-direction screw rod seat (4-18) is fixed on a fixed seat (4-12); one end of the double-rotation-direction threaded rod (4-17) is connected with the bakelite hand wheel (4-4) through a coaxial connecting column (4-15); two front chain wheels (4-7) are arranged in the middle of the stepped shaft (4-1), and the two front chain wheels (4-7) are positioned between two groups of bearing seat flanges (4-6); a spacer bush (4-9) is arranged on the stepped shaft (4-1) between the bearing seat flange (4-6) and the adjacent front chain wheel (4-7) on the same side; a plurality of detection induction spacer bushes (4-8) are arranged on the stepped shaft (4-1) between the two front chain wheels (4-7); a driving chain wheel (4-19) which is used for being in transmission connection with an output shaft of the motor (6-4) is arranged on the stepped shaft (4-1) between the bearing seat flange (4-6) and the fixed seat (4-12) on one side.

6. The double-chain conveyor according to claim 2, wherein the crank arm part (5) comprises two sets of adjusting connecting rods (5-1), crank arms (5-2), deep groove ball bearings (5-3) and second springs (5-4), the two sets of crank arms (5-2) are arranged up and down, the crank arms (5-2) play a role of a lever, the fulcrum of the crank arms (5-2) are movably connected to one side of the rack (1), the deep groove ball bearings (5-3) are arranged at the power points of the crank arms (5-2), the second springs (5-4) are connected between the resistance arms of the crank arms (5-2) and the rack (1), the power points of the lower crank arms (5-2) are hinged with the other ends of the hinges (2-6) of the rear scraper straightening part (2) through the upper adjusting connecting rods (5-1), the lower deep groove ball bearing (5-3) corresponds to the small cam (4-11) of the planet structure adjusting part (4); the power point of the upper crank arm (5-2) is hinged with the small crank arm (3-6) of the front scraper alignment part (3) through the upper adjusting connecting rod (5-1), and the upper deep groove ball bearing (5-3) corresponds to the large cam (4-10) of the planet structure adjusting part (4).