CN215100001U

CN215100001U - Conveying device for irradiation sterilization of electron accelerator

Info

Publication number: CN215100001U
Application number: CN202121116151.5U
Authority: CN
Inventors: 曹善勇; 谢仕志
Original assignee: Shanghai Xiaoniu Information Technology Co ltd
Current assignee: Shanghai Xiaoniu Information Technology Co ltd
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2021-12-10
Anticipated expiration: 2031-05-24

Abstract

A conveying device for irradiation sterilization of an electron accelerator comprises a tray body, a frame body, a conveying chain, a motor, a guide cylinder device, a chain guide tensioning device and a transmission mechanism; limiting grooves are respectively arranged on the left side and the right side of the frame body; the motor is arranged at the back of the front end of the frame body, and a driving chain wheel is arranged on a rotating shaft of the motor; the transmission mechanism comprises a bearing seat, a shaft rod and a driven chain wheel, the shaft rod is sleeved in a bearing inner ring of the bearing seat, and the driven chain wheel is arranged at the side end of the shaft rod; two sets of transmission mechanism bearing seats are respectively arranged in the middle of the front end and the rear end of the frame body; the two conveying chains are respectively sleeved outside the left driven chain wheel and the right driven chain wheel of the two sets of transmission mechanisms; two sets of chain guide tensioning equipment are respectively arranged on two sides of the lower end of the frame body; the tray body comprises a lower tray body, a guardrail, a guide wheel and a fixed sprocket; two sets of guide cylinder equipment are respectively arranged at the front part and the rear part of the frame body. The tray ensures that goods in the tray body are not damaged due to overheating caused by too long irradiation time. This novel application prospect that has.

Description

Conveying device for irradiation sterilization of electron accelerator

Technical Field

The utility model relates to an electronic transfer chain equipment technical field, a conveyor who is used for electron accelerator irradiation sterilization to use very much.

Background

Electric conveyor line equipment (including drum and conveyor belts) is equipment for conveying articles from a previous station to another station. In actual production, some products or goods need to be irradiated and sterilized by adopting an electron accelerator irradiation device, the electron accelerator irradiation device is arranged at the upper end of the irradiation position of the electric conveying line, and then the products or goods passing through the lower end of the electron accelerator irradiation device are irradiated and sterilized.

When the electron accelerator irradiation equipment is used for irradiation sterilization, because the temperature of particle beams generated under lower beams is extremely high, products or goods are easy to burn out after staying under the beams for a long time, and even a fire disaster is caused. At present, an electric conveying line device used in combination with an electron accelerator irradiation device in the industry generally adopts an electric stainless steel roller conveying device, when products or goods are conveyed to the irradiation device for irradiation, due to the fact that two ends of a tray for conveying the goods do not have limiting mechanisms, when the tray moves on a conveying line and is inclined in the left-right transverse position, guard plates on two sides of the tray and two sides of the electric conveying line are prone to collision and blocking, and further a chuck phenomenon is caused. Also, when the pallet transports products or goods, there is a possibility that the slip speed between the lower end of the pallet and the upper end of the drum becomes slow (particularly, liquid including lubricating oil adheres to the lower end of the pallet or the upper end of the drum for various reasons), and thus, the irradiated products or goods may be damaged due to the long heating time. Finally, because the distance between the plurality of transmission rollers of the electric stainless steel roller conveying equipment is small, the rollers adjacent to the lower end of the irradiation equipment are not easy to radiate heat because of being irradiated at high temperature for a long time, the lubricating effect is influenced, the rollers are easy to damage after being used for a long time, and further great influence is brought to conveyed products or goods. In summary, it is necessary to provide a conveying device that does not use a roller as a carrier for conveying, and can prevent a pallet from slipping and a chuck during conveying goods or products, thereby effectively ensuring good irradiation effect of the products or goods.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects that the prior electric stainless steel roller conveying equipment is combined with an electron accelerator irradiation equipment for use, because the structure is limited, the phenomena of chuck and slipping are easily generated, and the irradiated products or goods are easy to be overheated and damaged, the utility model provides a tray body which does not adopt a roller as a carrier for conveying the tray body, under the combined action of related mechanisms in application, the two side ends of the tray body are clamped on the transmission chains at the upper parts of the two side ends of the frame body through the chain wheel meshing and conveyed forwards, the meshing between the two parts plays good limiting and guiding roles for the tray body and the products or goods inside the tray body, and the phenomena of the tray body slipping or the chuck and the like can be effectively prevented, and further, the conveying device for the irradiation sterilization of the electron accelerator is ensured not to be damaged due to overheating caused by too long irradiation time when the tray body is conveyed to the lower end of the irradiation equipment of the electron accelerator for irradiation.

The utility model provides a technical scheme that its technical problem adopted is:

a conveying device for irradiation sterilization of an electron accelerator comprises a tray body, a frame body, a conveying chain, a motor, a guide cylinder device, a chain guide tensioning device and a transmission mechanism; the frame is characterized in that the frame body is of a hollow structure, and the upper parts of the left side end and the right side end of the frame body are respectively provided with a limiting groove; the motor is arranged at the lower end of the frame body, and a driving chain wheel is arranged on a rotating shaft of the motor; the chain guide tensioning device, the guide cylinder device and the transmission mechanisms are respectively provided with two sets, each set of transmission mechanism comprises a bearing seat, a shaft lever and at least two driven chain wheels, the shaft lever is arranged in a bearing inner ring of the bearing seat, and the two driven chain wheels are respectively arranged on the left side and the right side of the shaft lever; the bearing seats of the two sets of transmission mechanisms are respectively arranged at the front end and the rear end of the frame body, one side of a shaft lever of one set of transmission mechanism is also provided with a driving chain wheel, and the driving chain wheel is connected with a driving chain wheel of the motor through a chain; the two conveying chains are respectively sleeved outside the driven chain wheels on the left side and the right side of the shaft levers of the two sets of transmission mechanisms; the two sets of chain guide tensioning equipment are respectively arranged on two sides of the lower end of the frame body; the tray body comprises a lower tray body, a guardrail, guide wheels and fixed chain gears, the guardrail is arranged at the upper end of the lower tray body, the guide wheels and the fixed chain gears are respectively arranged at the left side end and the right side end of the lower tray body at intervals, and the front end of the lower tray body is provided with an anti-collision block; the two sets of guide cylinder equipment are respectively arranged at the front part and the rear part of the frame body.

Furthermore, the upper end of the transmission mechanism is lower than the lower end of the left and right side end limiting grooves of the frame body.

Further, the guide cylinder equipment includes the bracing piece, rotates the cylinder and rotates and install the connecting axle rod, and the connecting axle rod is installed in the upper end of bracing piece, and the upper end of rotating the cylinder is higher than the support body and controls the height of side spacing groove lower extreme.

Further, the fixed sprocket of the tray body is of a fan-shaped structure and is provided with a plurality of vertically distributed sprockets; the leading wheel includes bearing and fixed plate, and the bearing parallel rotation is installed under the fixed plate.

Furthermore, the distance between the fixed chain gears at the lower parts of the left side end and the right side end of the tray body is consistent with the distance between the middle parts of the upper ends of the conveying chains at the left side and the right side of the upper part of the frame body, and the distance between the outer side end of the guide wheel bearing at the left side end and the outer side end of the guardrail at the left side end and the right side end of the lower tray body is smaller than the distance between the inner sides of the conveying chains at the left side end and the right side end of the upper end of the frame body.

Furthermore, the upper and lower parts of the two conveying chains are respectively positioned between the inner sides of the upper and lower ends of the two limiting grooves at the upper parts of the left and right side ends of the frame body at intervals.

Furthermore, each set of chain guide tensioning equipment comprises a movable chain wheel and a fixed chain wheel, and connecting plates are respectively arranged in the middle of the rear ends of the left and right side end limiting grooves of the frame body; fixed chain wheels of the two sets of chain guide tensioning equipment are respectively and rotatably arranged on the upper parts of the two connecting plates, movable chain wheels of the two sets of chain guide tensioning equipment are respectively and movably arranged on the lower parts of the two connecting plates, and the movable chain wheels, the fixed chain wheels and the lower ends of the left and right side conveying chains of the frame body of the two sets of chain guide tensioning equipment are respectively meshed after being encircled.

The utility model has the advantages that: the utility model discloses do not adopt the cylinder as the carrier of carrying the tray body, electron accelerator irradiation equipment is installed the utility model discloses a middle part upper end, the utility model discloses transversely be located between the ordinary two sets of electronic stainless steel cylinder conveying equipment. In the application, the tray body of last process electric stainless steel cylinder conveying equipment output and goods or product that are equipped with in it upper end get into behind two spacing grooves on the side upper portion about support body department through the direction of rear end guide cylinder equipment, the sprocket of four fixed sprocket lower parts of tray body left and right sides can block respectively in the chain groove of two conveyor chains, like this, the tray body can effectively realize and carry the fixing between the chain, and be carried the chain and drive the lower extreme that moves ahead to electron accelerator irradiation equipment and carry out the irradiation sterilization, then get into the conveyor cylinder upper portion that another set of electric stainless steel cylinder conveying equipment, to next process by conveyor chain transmission front end again. The utility model discloses in, the preceding transport of going to the transport chain is gone to tray body both sides end through fixed sprocket meshing card, and the meshing has played good spacing and guide effect to tray body and inside product or goods between the two, can prevent effectively that the tray body from skidding or the emergence of phenomenons such as chuck, and then guaranteed that the tray body transports when electron accelerator irradiation equipment lower extreme irradiation, can not damage because of the too overheated of a specified duration of irradiation time. The utility model discloses electron accelerator irradiation equipment's lower extreme the utility model discloses do not have the movable part, consequently do not exist the irradiation and lead to the drawback that rotating part damaged for a long time. Based on the above, so the utility model discloses good application prospect has.

Drawings

The invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic view of the whole left-side perspective structure of the present invention.

Fig. 2 is a schematic view of the three-dimensional structure of the tray body of the present invention.

Fig. 3 is a schematic view of the overall overlooking three-dimensional structure of the present invention.

Detailed Description

As shown in fig. 1, 2 and 3, a conveying device for irradiation sterilization of an electron accelerator includes a PLC (not shown in the drawings, a PLC control power output end and a power input end of a motor are connected via a wire), a tray body 1, a frame body 2, an annular conveying chain 3, a motor 4, a guide cylinder device 5, a chain guide tensioning device 6 and a transmission mechanism 7; the frame body 2 is formed by welding profile steels and combining screw nuts, the frame body 2 is of a rectangular structure, the middle part of the frame body is of a rectangular hollow structure, and the upper parts of the left side end and the right side end of the frame body 2 are respectively and longitudinally provided with a [ "and" ] "-shaped limiting groove 21 through the screw nuts; a front supporting plate 22 and a rear supporting plate 23 are respectively and transversely installed on the inner side of the upper part of the front end and the inner side of the upper part of the rear end of the frame body 2 through screw nuts, the motor 4 is transversely installed on the upper rear part of the front supporting plate 22 through the screw nuts, a driving chain wheel (not shown in the figure) is tightly sleeved at the right end of a rotating shaft of the motor 4, and a protective shell 41 is installed at the upper end of the motor 4 through the screw nuts; the chain guide tensioning device 6, the guide cylinder device 5 and the transmission mechanisms 7 are respectively provided with two sets of the same, each set of the transmission mechanism 7 comprises two bearing seats 71, a shaft rod 72 and two driven chain wheels 73, the driven chain wheels 73 are the same, the shaft rod 72 is transversely and tightly sleeved in bearing inner rings of the two bearing seats 71, the left part and the right part of the shaft rod 72 are respectively positioned at the outer sides of the left end and the right end of the two bearing seats 71, and the middle parts of the two driven chain wheels 73 are respectively and tightly sleeved at the outermost ends of the left side and the right side of the shaft rod 72; two bearing seats 71 of the two sets of transmission mechanisms are respectively arranged on the upper front part of the front supporting plate 22 and two sides of the upper part of the rear supporting plate 23 through screw nuts, a driving chain wheel 8 (which is 5 cm apart from a driven chain wheel at the right end) is also arranged on the right side of a shaft rod of the front set of transmission mechanism, and the driving chain wheel 8 is connected with a driving chain wheel 4 of a motor through a chain 9; the two conveying chains 3 are arranged, and the front ends and the rear ends of the two conveying chains 3 are respectively sleeved on the outer sides of driven chain wheels 73 on the left side and the right side of shaft levers of the front and rear sets of transmission mechanisms 7 at the upper end of the frame body 1; the two sets of chain guide tensioning equipment 6 are arranged on two sides of the lower end of the upper part of the rear side end of the frame body 2 through screw nuts; the tray body 1 comprises a rectangular lower tray body 101, eight guide wheels 102, four guide wheels 103 and four fixed chain gears 104, wherein the lower parts of the guide wheels 102 are welded at the upper end of the lower tray body 101, the guide wheels 103 are provided with eight fixed chain gears 104, the four guide wheels 103, two fixed chain gears 104, the other four guide wheels 103 and the other two fixed chain gears 104 are respectively arranged at the left and right side ends of the lower tray body 101 at intervals at certain intervals, and rectangular anti-collision blocks 105 are respectively arranged at the left and right front ends of the lower tray body 101 through screw nuts (the buffer effect is achieved, and articles are prevented from directly colliding with the tray body and being damaged); the support rods 51 of the two sets of guide cylinder devices are respectively arranged in the front middle part of the front support plate 22 and the rear middle part of the rear support plate 23.

As shown in fig. 1, 2 and 3, the upper ends of the protective casing 41 and the transmission mechanism 7 are lower than the lower ends of the left and right side end limiting grooves 21 of the frame body. The guide cylinder equipment 5 comprises two support rods 51 and a rotary roller 52, wherein the middle parts of the two side ends of the rotary roller 52 are respectively sleeved with a bearing, a connecting shaft rod 53 is sleeved in an inner ring in the two bearings, the left and right outer side ends of the connecting shaft rod 53 are respectively welded on the inner sides of the upper ends of the two support rods 51, the upper end of the rotary roller 52 is slightly higher than the height of the lower ends of the left and right side end limiting grooves 21 of the rack body, and the height of the upper end of the rotary roller 52 is equal to the height of the lower end of the rectangular lower tray body 101 of the tray body 1 after the tray body 1 enters the rack body. The fixed chain gear 101 of the tray body is of a fan-shaped structure and is provided with three vertically distributed chain teeth, the fixed chain gear 101 is arranged on a right-angled-away fixing frame 106, and eight fixing frames 106 for fixing the chain gears are respectively arranged at the left side end and the right side end of the lower tray body 101; the guide wheels 103 comprise bearings 1031 and an "right-angled" fixing plate 1032, a screw rod is vertically welded in the middle of the upper portion of the fixing plate 1032, the screw rod is tightly sleeved in an inner ring of each bearing, a fixing nut is installed at the lower end of each screw rod, the bearings can rotate along a shaft rod, and the fixing plates 1032 of the four guide wheels are installed at the left side end and the right side end of the lower tray body 101. The distance between the fixed chain gears 104 at the lower parts of the left and right side ends of the tray body 101 is consistent with the distance between the middle parts of the upper ends of the conveying chains 3 at the left and right sides of the upper part of the frame body 2, and the distance between the bearing outer ends of the guide wheels 103 at the left and right side ends of the lower tray body 101 and the ends at the two sides of the guardrail 102 is smaller than the distance between the inner sides of the conveying chains 3 at the left and right sides of the upper end of the frame body. The upper and lower parts of the two conveying chains 3 are respectively positioned between the inner sides of the upper and lower ends of the two limiting grooves 21 at the upper parts of the left and right side ends of the frame body at certain intervals. Each set of chain guide tensioning equipment comprises a movable chain wheel 61 and two fixed chain wheels 62, wherein a bearing is tightly sleeved in the middle of each of the movable chain wheel 61 and the fixed chain wheels 62, a rectangular opening is respectively arranged in the middle of the rear end of an upper limiting groove at the left side end and the right side end of the frame body 1, a T-shaped connecting plate 63 is respectively installed in the openings of the two limiting grooves through screw nuts, and a shaft rod is respectively and transversely welded at the front and rear ends of the upper part of the inner side end of the connecting plate 63; the bearing inner rings of the two fixed chain wheels 62 of each set of chain guide tensioning equipment are respectively tightly sleeved at the middle parts of the outer side ends of the two shaft rods of the two connecting plates 63 (the fixed chain wheels 62 can rotate along the shaft rods through bearings), the middle part of the lower end of each connecting plate 63 is provided with a rectangular open slot 64, the middle part of the bearing inner ring of the movable chain wheel 61 of each set of chain guide tensioning equipment is tightly sleeved with a screw rod, the outer end of the screw rod is positioned in the open slot 64 of one of the connecting plates, and the outermost end of the screw rod positioned in the open slot 64 of the connecting plate is provided with a fixing nut; the middle part of the rear end of the conveying chain 3 at the left end and the right end of the frame body is lower, one section of the rear end is positioned at the upper ends of the rear end fixed chain wheels 62 of the two sets of chain guide tensioning devices and is meshed with the rear end fixed chain wheels 62, one section of the front end is positioned at the upper ends of the front end fixed chain wheels 62 and is meshed with the front end fixed chain wheels, the lower end is positioned at the lower end of the movable chain wheel 61 and is meshed with the movable chain wheel (the screw rod is vertically moved by loosening the fixed nut, the upper height and the lower height of each set of movable chain wheel 61 of the chain guide tensioning device can be moved, further, the tightness adjustment of the conveying chain 3 can be realized, the conveying chain is tensioned after downward adjustment, otherwise, and the fixed nut is screwed after the adjustment is well done).

Fig. 1, 2, 3 show, the utility model discloses do not adopt the cylinder as the carrier of carrying the tray body, electron accelerator irradiation equipment installs the utility model discloses a middle part upper end (set up mount installation electron accelerator irradiation equipment at support body middle part right side end alone), the utility model discloses transversely be located between ordinary two sets of electronic stainless steel cylinder conveying equipment. In application, the PLC controls the motor 4 to work by electricity, and the motor 4 drives the upper ends of the two conveying chains 3 to move clockwise through the driving chain wheel, the driving chain wheel 8, the chain 9, the shaft rod 72 and the two driven chain wheels 73 (the driven chain wheel 73 of the transmission mechanism at the rear end of the rack plays a role in follow-up). When the pallet body 1 output by the electric stainless steel roller conveying equipment in the previous process and goods or products arranged at the upper end in the pallet body enter between two limiting grooves 21 at the upper parts of the left side end and the right side end at the rear end of the frame body after being guided by the rear end guide cylinder equipment 5 (the rotary cylinder 52 of the guide cylinder equipment is consistent with the upper ends of the rollers of the two sets of electric stainless steel roller conveying equipment in height, the rotary cylinder 52 of the guide cylinder equipment plays a role in rotating, guiding and supporting the lower end of the pallet body 101, chain teeth at the lower parts of four fixed chain gears 104 at the left end and the right end of the pallet body 101 are respectively clamped in the chain grooves at the upper parts of the two conveying chains 3, so that the left end and the right end of the pallet body 101 can effectively realize the fixation with the upper ends of the two conveying chains 3 (the outer sides of bearings 103 at the left end and the right end of the pallet body are attached to the inner sides of the upper parts of the left end and the right end conveying chains 3 to slide to play a role in limiting and guiding the movement of the pallet body), the tray body 101 is driven by the conveying chain 3 to move forward to the lower end of the electronic accelerator irradiation equipment to perform irradiation sterilization on goods and products inside the tray body (the tray is prevented from causing overlong irradiation time at the lower end of the electronic accelerator irradiation equipment due to blockage and the like), then the tray body 1 is transmitted to the upper part of a conveying roller of another set of electric stainless steel roller conveying equipment by the conveying chain, and the next procedure is performed (the guide cylinder equipment at the front end of the rack body is used for guiding and supporting the lower end of the tray body, so that the tray body smoothly moves to the conveying roller of another set of electric stainless steel roller conveying equipment at the right part of the rack body). The utility model discloses in, because 1 both sides of tray body are gone forward at the conveyor chain through fixed sprocket 104 meshing card and are carried, the meshing has played good spacing and guide effect to tray body 1 and inside product or goods between the two, can prevent effectively that tray body 1 from skidding or the emergence of phenomenons such as chuck, and then guaranteed that tray body 1 transports when electron accelerator irradiation equipment lower extreme irradiation, can not damage because of the too overheated of a specified duration of irradiation time. The utility model discloses electron accelerator irradiation equipment's lower extreme does not have the movable part, consequently does not have the drawback that the irradiation leads to the rotating part to damage.

The essential features of the invention and the advantages of the invention have been shown and described above, it being obvious to a person skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, but that it can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, the embodiments do not include only one independent technical solution, and such description is only for clarity, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A conveying device for irradiation sterilization of an electron accelerator comprises a tray body, a frame body, a conveying chain, a motor, a guide cylinder device, a chain guide tensioning device and a transmission mechanism; the frame is characterized in that the frame body is of a hollow structure, and the upper parts of the left side end and the right side end of the frame body are respectively provided with a limiting groove; the motor is arranged at the lower end of the frame body, and a driving chain wheel is arranged on a rotating shaft of the motor; the chain guide tensioning device, the guide cylinder device and the transmission mechanisms are respectively provided with two sets, each set of transmission mechanism comprises a bearing seat, a shaft lever and at least two driven chain wheels, the shaft lever is arranged in a bearing inner ring of the bearing seat, and the two driven chain wheels are respectively arranged on the left side and the right side of the shaft lever; the bearing seats of the two sets of transmission mechanisms are respectively arranged at the front end and the rear end of the frame body, one side of a shaft lever of one set of transmission mechanism is also provided with a driving chain wheel, and the driving chain wheel is connected with a driving chain wheel of the motor through a chain; the two conveying chains are respectively sleeved outside the driven chain wheels on the left side and the right side of the shaft levers of the two sets of transmission mechanisms; the two sets of chain guide tensioning equipment are respectively arranged on two sides of the lower end of the frame body; the tray body comprises a lower tray body, a guardrail, guide wheels and fixed chain gears, the guardrail is arranged at the upper end of the lower tray body, the guide wheels and the fixed chain gears are respectively arranged at the left side end and the right side end of the lower tray body at intervals, and the front end of the lower tray body is provided with an anti-collision block; the two sets of guide cylinder equipment are respectively arranged at the front part and the rear part of the frame body.

2. The conveying device for the irradiation sterilization of the electron accelerator as claimed in claim 1, wherein the upper end of the transmission mechanism is lower than the lower end of the left and right side end limiting grooves of the frame body.

3. The conveying device for the irradiation sterilization of the electron accelerator as claimed in claim 1, wherein the guiding cylinder device comprises a supporting rod and a rotating roller, the rotating roller is rotatably provided with a connecting shaft rod, the connecting shaft rod is arranged at the upper end of the supporting rod, and the upper end of the rotating roller is higher than the lower end of the limiting grooves at the left and right side ends of the frame body.

4. The conveying device for the radiation sterilization of the electron accelerator as claimed in claim 1, wherein the fixed sprocket of the tray body is a fan-shaped structure having a plurality of vertically distributed sprockets; the leading wheel includes bearing and fixed plate, and the bearing parallel rotation is installed under the fixed plate.

5. The conveying device for electron accelerator irradiation sterilization as claimed in claim 1, wherein the distance between the lower fixed sprockets at the left and right sides of the tray body is the same as the distance between the upper middle parts of the conveying chains at the left and right sides of the upper part of the frame body, and the distance between the outer ends of the guide wheel bearings and the two side ends of the guard rails at the left and right sides of the lower tray body is smaller than the distance between the inner sides of the conveying chains at the left and right sides of the upper end of the frame body.

6. The conveying device for electron accelerator irradiation sterilization according to claim 1, wherein the upper and lower parts of the two conveying chains are respectively located between the inner sides of the upper and lower ends of the two limiting grooves at the upper parts of the left and right side ends of the frame body with a distance.

7. The conveying device for the irradiation sterilization of the electron accelerator as claimed in claim 1, wherein each set of chain guide tensioning equipment comprises a movable chain wheel and a fixed chain wheel, and connecting plates are respectively arranged in the middle of the rear ends of the left and right side end limiting grooves of the frame body; fixed chain wheels of the two sets of chain guide tensioning equipment are respectively and rotatably arranged on the upper parts of the two connecting plates, movable chain wheels of the two sets of chain guide tensioning equipment are respectively and movably arranged on the lower parts of the two connecting plates, and the movable chain wheels, the fixed chain wheels and the lower ends of the left and right side conveying chains of the frame body of the two sets of chain guide tensioning equipment are respectively meshed after being encircled.