Automatic processing production line for metal pipe joint handle of fruit and vegetable planer

Abstract

The application discloses a kind of fruit and vegetable planing metal pipe joint handle automatic processing production line, including storage mechanism, gyro wheel feeding device, laser cutting device, automatic alignment feeding device, pipe joint induction pusher device, chamfering device and polishing device, storage mechanism is sent long metal pipe material to its left gyro wheel feeding mechanism, gyro wheel feeding device is sent long metal pipe material to its left laser cutting device and is cut into metal pipe joint, metal pipe joint is transported to chamfering device and is chamfered by first conveying belt, automatic alignment feeding device, pipe joint induction pusher device, finally metal pipe joint is transported to polishing device and is polished by third conveying belt.Processing production integration is automatically induced in the application, metal pipe material cutting, chamfering and polishing process are fully automated, improve safety production efficiency, reduce manual labor, and the product quality produced is stable, which greatly improves the working environment protection.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of metal pipe processing, more specifically, it relates to a fruit and vegetable peeler metal pipe joint handle automatic processing production line. BACKGROUND

[0002] Fruit and vegetable peelers are daily necessities that are used every day. Conventional fruit and vegetable peelers are mainly used for conveniently shredding. With the progress of society, fruit and vegetable peelers have become diverse. Different tools can be used for shredding, slicing, and some can even be used for cutting flower pieces, providing more styles for our cooked dishes and being convenient to use.

[0003] At present, there are many types of fruit and vegetable peelers on the market, such as flat fruit and vegetable peelers and vertical multi-surface fruit and vegetable peelers, which generally include a peeling piece, a peeling frame, and a peeling handle. The peeling handle is a component for a user to hold and fix the fruit and vegetable peeler. For example, a Chinese design patent with the publication number CN305653270S and the name Peeling tool handle (19166) discloses a peeling handle for a vertical multi-surface fruit and vegetable peeler, which includes a handle and a handle fixing frame. The handle is the part of the palm for gripping, and the fixing frame is a component for fixing the handle and the peeling piece. The handle can be made of plastic, wood, or a metal pipe joint, and the fixing frame can be a plastic component connected to the peeling piece frame or two connecting arms welded at both ends of the metal pipe joint.

[0004] The metal pipe joint handle of the above-mentioned peeling tool handle is a metal pipe joint made by cutting a long metal pipe into a certain length, and then performing chamfering and polishing processes, which involves multiple processes and uses equipment such as cutting machines, chamfering machines, and polishing machines.

[0005] For example, a Chinese utility model patent with the publication number CN217749926U discloses a pipe cutting machine, which includes a base, a control device, a rotating device, and a laser cutting device, and also includes a supporting device and a pipe moving device. The rotating device, laser cutting device, and supporting device are sequentially arranged on the base. The pipe moving device is also arranged between the rotating device and the supporting device. The control device is electrically connected with the rotating device, pipe moving device, supporting device, and laser cutting device. The rotating device is used for rotating the pipe, the pipe moving device is used for moving the pipe in the length direction, and the supporting device is used for supporting the cut pipe segment. This technical solution only solves the problem of cutting long metal pipes and does not provide an automatic integrated solution for cutting, chamfering, and polishing.

[0006] At present, in the handle processing industry of vertical multi-surface fruit and vegetable planer, each process of making metal pipe section handle is separated, after the long metal pipe is cut into metal pipe section by cutting machine, manual transfer is needed to chamfer machine to chamfer both ends of the metal pipe section, and then manual transfer is needed to polishing machine for surface polishing, which cannot realize full-automatic processing, the working strength of workers is high, and the production efficiency is low. SUMMARY

[0007] The application aims to solve the above technical problems, and aims to provide a fruit and vegetable planer metal pipe section handle automatic processing production line which can reduce manual labor, improve production efficiency and has stable performance.

[0008] The application is implemented through the following technical solutions.

[0009] The application provides a fruit and vegetable planer metal pipe section handle automatic processing production line, which comprises a storage device, a roller feeding device, a laser cutting device, an automatic straightening and feeding device, a pipe section induction pushing device, a chamfering device and a polishing device, wherein:

[0010] The storage device comprises a rack, a supporting plate, a blanking mechanism and a pushing mechanism, the rack is used for placing long metal pipes, the blanking mechanism is arranged on the rack and can push the long metal pipes to fall on the supporting plate, and the pushing mechanism is arranged at the right end of the supporting plate and can push the long metal pipes falling on the supporting plate to move to the direction of the roller feeding device;

[0011] The laser cutting device is arranged on the left side of the storage device, and the laser cutting device comprises a loose and tight rotating chuck, a laser cutting head and a pipe induction positioning mechanism, the loose and tight rotating chuck is provided with a pipe feeding channel, the loose and tight rotating chuck can clamp and rotate the long metal pipes passing through the pipe feeding channel, the laser cutting head is installed above the outlet position of the pipe feeding channel, the pipe induction positioning mechanism is arranged on the left side of the pipe feeding channel and can adjust the position left and right, the pipe induction positioning mechanism is provided with a positioning baffle, the positioning baffle is provided with a first conductive contact, the long metal pipes are blocked and positioned by the positioning baffle after entering the pipe feeding channel and can contact the first conductive contact, the long metal pipes are cut into metal pipe sections by the laser cutting head and fall into the first conveying belt arranged below the pipe feeding inlet, and the first conveying belt can transport the metal pipe sections to the left side of the pipe feeding channel.

[0012] The roller feeding device is arranged between the supporting plate and the laser cutting device, and comprises roller mechanisms, a roller driving motor, a material falling sensor and a second conductive contact. The roller mechanism comprises a roller driven to rotate by the roller driving motor. The number of the roller mechanisms is two. The two roller mechanisms are arranged at the front and rear positions of the corresponding supporting plate respectively and can approach and move away from each other, so as to clamp and release the long metal pipe. The material falling sensor is arranged between the two roller mechanisms and is used to sense the long metal pipe. When the material falling sensor senses that the long metal pipe is absent, the material falling sensor sends a starting signal to the material falling mechanism. The second conductive contact is arranged to contact the outer surface of the passing long metal pipe. The first conductive contact and the second conductive contact constitute a control switch for controlling the two roller mechanisms to move away from and approach each other.

[0013] The automatic straightening feeding device comprises a hopper, a straightening pushing mechanism and a second conveying belt. The hopper is arranged at the left end of the first conveying belt. The metal pipe section transported by the first conveying belt can fall into the hopper. The straightening pushing mechanism is arranged to push the metal pipe section in the hopper to the second conveying belt arranged above the hopper.

[0014] The pipe section sensing and pushing device is arranged at the left end of the second conveying belt. The pipe section sensing and pushing device is arranged to sense the metal pipe section and push the metal pipe section away from the second conveying belt in the horizontal direction perpendicular to the conveying direction of the second conveying belt.

[0015] The chamfering device comprises a wheel disc, a rotating positioning device and a chamfering assembly. The wheel disc is arranged vertically. The circumferential surface of the wheel disc is provided with semicircular notches corresponding to the circumferential shape of the metal pipe section at intervals. The rotating positioning device is arranged above the wheel disc and can press the metal pipe section downward. The chamfering assembly is arranged on the left and right sides of the wheel disc. The wheel disc is provided with a pipe section guide plate at the feeding position. The pipe section guide plate can receive the metal pipe section pushed by the pipe section sensing and pushing device. The wheel disc is provided with a third conveying belt at the discharging position. The third conveying belt can transport the metal pipe section falling thereinto to the polishing device arranged on the left side of the chamfering device for polishing. The polishing device is provided with a discharging port. The polished metal pipe section is discharged from the discharging port.

[0016] In the above technical solution, the workers first put a certain amount of long metal pipes on the feeding rack, and the production line can start automatic processing after being controlled by the numerical control system. When there is no long metal pipe between the two rollers, the blanking sensor does not sense the long metal pipe, and it will send a start signal to the blanking mechanism. After the long metal pipe falls on the supporting plate, the pushing mechanism senses the long metal pipe and pushes it in the length direction to the roller feeding device. The rollers of the roller mechanism clamp the long metal pipe, and through the rolling of the rollers, the long metal pipe is conveyed into the laser cutting device until the end of the long metal pipe contacts the positioning baffle. At this time, the first and second conductive contacts are in contact with the long metal pipe at the same time, and a signal is sent to make the rollers of the two roller mechanisms move away from each other, and the two rollers loosen the long metal pipe to stop conveying. The laser cutting head of the laser cutting device starts cutting, and the loose rotating chuck clamps and rotates the long metal pipe. After cutting is completed, the cut metal pipe section falls on the first conveying belt. At this time, the end of the long metal pipe is not in contact with the first conductive contact, and the control switch composed of the first and second conductive contacts sends a signal to make the rollers of the two roller mechanisms move close to each other, and the two rollers clamp and convey the long metal pipe. The above process is repeated. The cut metal pipe section falls on the first conveying belt and is conveyed to the hopper of the straightening feeding device for storage. The straightening pushing mechanism conveys the metal pipe section to the second conveying belt, and the second conveying belt conveys the metal pipe section to the pipe section sensing and pushing device. The pipe section sensing and pushing device pushes the metal pipe section to the pipe section guide plate and finally enters the semicircular notch provided on the wheel disc. After chamfering, the third conveying belt conveys the polished metal pipe section to the polishing device. The polished metal pipe section is discharged from the discharge port and collected by the collecting box, realizing automatic processing of the long metal pipe cutting, chamfering and polishing processes, reducing manual labor and improving safety production efficiency.

[0017] Preferably, the rack comprises a base frame and a plurality of vertically arranged pipe support plates, the pipe support plates are fixed on the base frame in a horizontal direction, the pipe support plates are provided with pipe placing channels in a transverse direction, the pipe placing channels are communicated with vertically arranged pipe feeding channels, the feeding mechanism comprises a feeding baffle and a feeding cylinder, the feeding baffle is connected with the pipe support plate, the top end of the feeding baffle extends into the pipe placing channel, and the distance from the top end of the feeding baffle to the upper edge of the pipe placing channel is greater than the outer diameter of the long metal pipe, the feeding cylinder is arranged below the pipe placing channel and is fixed with the pipe support plate, the feeding cylinder can push the long metal pipe upward so that the long metal pipe can fall from the pipe feeding channel by overcoming the top end of the feeding baffle, and the supporting plate is arranged at the outlet position of the pipe feeding channel. In this technical solution, the pipe placing channels of the pipe support plates can horizontally arrange a plurality of long metal pipes, workers can load once, the production line can be fully automatic for a long time, and workers can continuously supplement the long metal pipes during the processing process. The production line can be continuously operated for a long time without interruption, only one or two workers are needed to supplement the long metal pipes, and the processing efficiency is high.

[0018] Preferably, the feeding baffle is provided with a long strip-shaped through hole, and the feeding baffle is connected with the pipe support plate through a screw penetrating through the long strip-shaped through hole. In this way, the distance from the top end of the feeding baffle to the upper edge of the pipe placing channel can be adjusted by loosening or tightening the screw, so as to adapt to the feeding of long metal pipes with different outer diameters.

[0019] Preferably, the roller mechanism further comprises a bottom plate and a pushing cylinder, the roller is mounted on the bottom plate, and the bottom plate is connected with the pushing cylinder and driven by the pushing cylinder. In this technical solution, the pushing cylinder receives signals of the first and second conductive contacts, drives the bottom plate to move, controls the clamping or loosening of the long metal pipe by the roller, and realizes the conveying and pausing of the long metal pipe.

[0020] Preferably, the pipe induction positioning mechanism further comprises a positioning cylinder, an adjusting plate, a first guide rail shaft and a second guide rail shaft, the positioning cylinder is fixed on the adjusting plate, the positioning baffle is connected with the positioning cylinder and driven by the positioning cylinder to move left and right, the first and second guide rail shafts are arranged in a left-right direction and fixed with the laser cutting device, the adjusting plate is slidably connected with the first and second guide rail shafts to slide left and right along the first and second guide rail shafts, and the adjusting plate is provided with a first tightness adjusting mechanism capable of adjusting the tightness of the adjusting plate with the first and second guide rail shafts. In this technical solution, the position of the adjusting plate is adjusted and fixed in advance according to the length of the metal pipe segment to be cut, so as to meet the needs of cutting metal pipe segments with different lengths. After cutting is completed, the positioning cylinder drives the positioning baffle to move left to loosen the metal pipe segment and make it fall onto the first conveying belt below under the action of gravity.

[0021] Preferably, the laser cutting device further comprises a cutting positioning mechanism arranged at the front side of the outlet position of the pipe feeding channel, the cutting positioning mechanism comprising a cutting positioning plate, a cutting cylinder and a base, the cutting positioning plate being connected with the cutting cylinder and driven by the cutting cylinder to move forward and backward, the cutting cylinder being fixed on the base, the base being slidingly connected with the second guide rail shaft and capable of sliding left and right along the second guide rail shaft, and the base being provided with a second tightness adjusting mechanism capable of adjusting the tightness between the base and the second guide rail shaft. In the technical solution, the end of each long metal pipe newly entering the laser cutting device is blocked by the cutting positioning plate, so that the length of the end waste pipe cut by the laser cutting head can be much smaller than the length of the metal pipe to be normally cut, which can not only ensure that the two ends of each metal pipe cut are flat, but also reduce the length of the waste pipe and the overall material loss.

[0022] Preferably, the pushing mechanism comprises a push plate guide rail, a push plate, a pushing cylinder, a pipe end positioning plate, a first group of photoelectric sensors and a second group of photoelectric sensors, the push plate guide rail being arranged on the extended line of the right end of the supporting plate and cooperating with the supporting plate, the pushing cylinder being fixed with the push plate guide rail, the push plate being driven by the pushing cylinder to slide along the push plate guide rail, the pipe end positioning plate being vertically fixed on the upper surface of the push plate guide rail, the first group of photoelectric sensors being arranged on the right side of the pipe end positioning plate, the second group of photoelectric sensors being arranged on the left side of the pipe end positioning plate, and the first group of photoelectric sensors and the second group of photoelectric sensors each comprising two photoelectric sensors symmetrically arranged on the front and rear sides of the push plate guide rail. In the technical solution, the first group of photoelectric sensors are used to sense whether there is a long metal pipe on the supporting plate and send a starting signal to the pushing cylinder to push the long metal pipe for feeding, when the end of the long metal pipe is away from the first group of photoelectric sensors, the front end of the long metal pipe has entered the roller feeding device and contacted with the end of the previous long metal pipe, the long metal pipe is conveyed by the roller feeding device towards the laser cutting device, and the pushing cylinder drives the push plate to return to the original position for the next feeding. When the end of the long metal pipe is away from the position of the second group of photoelectric sensors for the first time, the second group of photoelectric sensors send a reverse rotation signal to the roller feeding device to convey the long metal pipe to the right until the end of the long metal pipe contacts with the pipe end positioning plate, and the second group of photoelectric sensors sense the long metal pipe again and send a signal to the roller feeding device to convey the long metal pipe towards the laser cutting device, and the cutting positioning mechanism of the laser cutting device starts to cut the end waste of the newly entered long metal pipe.

[0023] Preferably, the pipe section induction pushing device comprises a contact sensor, a proximity sensor and a pipe section pushing cylinder, the contact sensor is arranged at the left end of the second conveying belt to provide a start signal for the pipe section pushing cylinder, the proximity sensor is arranged at the end of the pipe section guide plate close to the pipe section pushing cylinder to provide a stop signal for the pipe section pushing cylinder, and the pipe section pushing cylinder is arranged at the front side close to the left end of the second conveying belt. In the technical scheme, when the metal pipe section of the second conveying belt is transported to contact the contact sensor, the contact sensor provides a start signal for the pipe section pushing cylinder, so as to push the metal pipe section away from the second conveying belt for the next process, and the proximity sensor sends a stop instruction to the pipe section pushing cylinder when the metal pipe section passes through. In addition, when the metal pipe sections in the pipe section guide plate are full, the proximity sensor continuously senses the metal pipe sections and continuously sends a stop signal to the pipe section pushing cylinder. Even if the contact sensor senses that the metal pipe section has been transported by the second conveying belt, the stop state of the pipe section pushing cylinder is maintained, so as to avoid the problem that the pipe section pushing cylinder continues to push the metal pipe section into the pipe section guide plate, causing the metal pipe sections in the pipe section guide plate to be squeezed or even overflow. In addition, although the metal pipe sections on the second conveying belt are also full, the metal pipe sections on the whole rectification pushing mechanism cannot enter the second conveying belt and overflow and fall back into the hopper for storage, which has no effect on the operation of the whole production line and has a protection effect.

[0024] Preferably, the polishing device is internally provided with a fourth conveying belt matched with the third conveying belt, the rear side of the fourth conveying belt is provided with a polishing wheel and a polishing wheel driving motor for driving the polishing wheel to rotate, and the front side of the fourth conveying belt is provided with an auxiliary wheel at a position corresponding to the polishing wheel. In the technical scheme, the polishing wheel polishes the circumferential surface of the metal pipe section conveyed by the fourth conveying belt, the auxiliary wheel assists in limiting the metal pipe section on the opposite side of the polishing wheel, and the polished metal pipe section is conveyed to the discharge port of the polishing device by the fourth conveying belt.

[0025] Preferably, the aligning and pushing mechanism comprises a first aligning plate, a second aligning plate, an interval plate and an aligning cylinder, the interval plate is arranged at a rear position in the hopper in a backward inclination, the first aligning plate and the second aligning plate are arranged at the front side and the rear side of the interval plate respectively and are parallel to the interval plate, the aligning cylinder is fixed at a rear position outside the hopper, the first aligning plate and the second aligning plate are connected with the aligning cylinder and can be driven by the aligning cylinder to move up and down, the top surface of the interval plate is arranged at a height of one half of the height between the bottom of the hopper and the second conveying belt, the top surface of the first aligning plate and the top surface of the second aligning plate are arranged such that when the top surface of the first aligning plate descends to the bottom of the hopper, the top of the second aligning plate descends to a position flush with the top surface of the interval plate, and when the top surface of the first aligning plate ascends to a position flush with the top surface of the interval plate, the top of the second aligning plate ascends to a position flush with the second conveying belt. In the technical solution, the aligning and pushing mechanism has a simple structure and stable and reliable performance, and has the functions of rearranging the metal pipe sections and continuously conveying the metal pipe sections from the hopper to the second conveying belt, the top surface of the first aligning plate transports the metal pipe sections to the top surface of the interval plate, the metal pipe sections roll to the top surface of the second aligning plate under the action of gravity when the top surface of the second aligning plate descends to the top surface of the interval plate, the top surface of the second aligning plate transports the metal pipe sections to the second conveying belt, the top surface of the first aligning plate transports the next batch of metal pipe sections to the top surface of the interval plate, and the cycle is repeated.

[0026] The production line of the present application is controlled by a numerical control system, integrates multiple sensing sensors and various mechanisms and devices designed for specific purposes, realizes automatic sensing processing and production integration of the metal pipe cutting, chamfering and polishing processes, can reduce manual labor, improve safety production efficiency, and has great improvement on the stability of product quality and working environment protection. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of the present application

[0028] Figure 2 is a schematic diagram of the structure of the roller feeding device of the present application.

[0029] Figure 3 is a schematic diagram of the structure of the pushing mechanism of the present application.

[0030] Figure 4 is a schematic diagram of the local structure of the laser cutting device of the present application.

[0031] Figure 5 is a schematic diagram of the structure of the automatic aligning and pushing mechanism of the present application.

[0032] Figure 6 is a schematic diagram of the cross-sectional structure of the aligning and pushing mechanism of the present application.

[0033] Figure 7This is a schematic diagram of the structure of the tube section induction feeding device of the present invention.

[0034] Figure 8 This is a partial structural schematic diagram of the chamfering processing device of the present invention.

[0035] Figure 9 This is a schematic diagram of the internal structure of the polishing device of the present invention. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings. The drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent.

[0037] To simplify the description of this embodiment, some components that are well-known to those skilled in the art but are not related to the main content of this invention may be omitted in the accompanying drawings or description. Additionally, for ease of description, some components in the drawings may be omitted, enlarged, or reduced, but these do not represent the actual product dimensions or the complete structure.

[0038] Example 1

[0039] like Figure 1 As shown, the present invention provides an automated processing production line for metal tube handles of fruit and vegetable peelers, including a material storage device 1 controlled by a CNC system, a roller feeding device 2, a laser cutting device 3, an automatic straightening feeding device 5, a tube induction pushing device 6, a chamfering processing device 7, and a polishing device 9.

[0040] like Figure 1 and Figure 2As shown, in the present embodiment, the storage device 1 comprises a rack, a supporting plate 15, a material falling mechanism and a pushing mechanism 14. The rack comprises a base frame and a plurality of vertically arranged pipe support plates 11 fixed on the base frame in the horizontal direction. The pipe support plates 11 comprise front, middle and rear pipe support plates 11, which are arranged in a horizontal direction and are inclined to form pipe placing channels 111. The height of the pipe placing channels 111 away from the supporting plate 15 is higher than the height of the pipe placing channels 111 close to the supporting plate 15. The rear end of the pipe placing channels 111 is connected to a vertically arranged pipe falling channel 112. The material falling mechanism comprises a falling baffle 12 and a falling cylinder 13. The falling baffle 12 is connected to the pipe support plates 11, and the top end of the falling baffle 12 extends into the pipe placing channel 111. The distance between the top end of the falling baffle 12 and the upper edge of the pipe placing channel 111 is greater than the outer diameter of the long metal pipe 10. The falling cylinder 13 is arranged below the pipe placing channel 111 and is fixed to the pipe support plates 11. The falling cylinder 13 can push the long metal pipe 10 upwards in the direction of the pipe placing channel 111 so that the long metal pipe 10 can fall from the pipe falling channel 112 over the top end of the falling baffle 12. The supporting plate 15 is arranged at the outlet position of the pipe falling channel 112. The pushing mechanism 14 comprises a push plate guide rail 141, a push plate 142, a pushing cylinder 143 and a first group of photoelectric sensors 145. The push plate guide rail 141 is arranged on the right extension line of the supporting plate 15 and cooperates with the supporting plate 15. The pushing cylinder 143 is fixed to the push plate guide rail 141. The push plate 142 is driven by the pushing cylinder 143 to move left and right along the push plate guide rail 141. The first group of photoelectric sensors 145 is arranged above the push plate guide rail 141 and comprises two photoelectric sensors symmetrically arranged on the front and rear sides above the push plate guide rail 141. The first group of photoelectric sensors 145 is used to sense whether there is a long metal pipe 10 on the supporting plate 15 and sends a start signal to the pushing cylinder 143 to push the long metal pipe 10 to the roller feeding device 2 for feeding.

[0041] As Figure 1 and Figure 4As shown, in the present embodiment, the laser cutting device 3 is arranged on the left side of the storage device 1, and the laser cutting device 3 comprises a loose rotating chuck 32, a laser cutting head 31 and a pipe sensing positioning mechanism 33. The loose rotating chuck 32 is provided with a pipe feeding channel, and the loose rotating chuck 32 can clamp and rotate the long metal pipe 10 passing through the pipe feeding channel. The laser cutting head 31 is installed above the outlet position of the pipe feeding channel. The pipe sensing positioning mechanism 33 is arranged on the left side of the pipe feeding channel, and the pipe sensing positioning mechanism 33 comprises a positioning baffle 332, a positioning cylinder 331, an adjusting plate 334, a first guide rail shaft 335 and a second guide rail shaft 336. The positioning cylinder 331 is fixed on the adjusting plate 334, and the positioning baffle 332 is connected with the positioning cylinder 331 and can be driven by the positioning cylinder 331 to move left and right. The positioning baffle 332 is provided with a first conductive contact 333. In the present embodiment, the first conductive contact 333 is a metal sheet provided in front of the positioning baffle 332 and connected with a wire. The first guide rail shaft 335 and the second guide rail shaft 336 are arranged in a left-right direction and fixed with the laser cutting device 3. The adjusting plate 334 is slidably connected with the first guide rail shaft 335 and the second guide rail shaft 336 and can slide left and right along the first guide rail shaft 335 and the second guide rail shaft 336. The adjusting plate 334 is provided with a first loose adjusting mechanism that can adjust the tightness of the adjusting plate 334 with the first guide rail shaft 335 and the second guide rail shaft 336. The first loose adjusting mechanism comprises a clamping block and a screw. The clamping block is provided with a clamping opening matched with the circumferential shape of the guide rail shaft. The screw is threadedly connected with the adjusting plate 334 and the clamping block. By adjusting the tightness of the clamping block with the guide rail shaft, the tightness of the adjusting plate 334 with the guide rail shaft can be adjusted.

[0042] As Figure 2As shown, in the present embodiment, the roller feeding device 2 is arranged between the supporting plate 15 and the laser cutting device 3. The roller feeding device 2 comprises roller mechanisms, a roller driving motor 24, a blanking sensor 25 and a second conductive contact 26, the roller mechanisms each comprise a roller 21, a base plate 22 and a pushing cylinder 23, the roller 21 is mounted on the base plate 22, the base plate 22 is connected with the pushing cylinder 23 and is driven by the pushing cylinder 23, and the roller 21 is driven to rotate by the roller driving motor 24. The number of the roller mechanisms is two, and the two roller mechanisms are arranged at the front and rear positions corresponding to the supporting plate 15 respectively and can approach and move away from each other so as to clamp and release the long metal pipe 10 passing through. In the two roller mechanisms, the roller 21 of one of the roller mechanisms can omit the arrangement of the roller driving motor 24 and can be driven as a driven wheel. The blanking sensor 25 is arranged between the two roller mechanisms and is used for sensing the long metal pipe 10. In the present embodiment, the blanking sensor 25 comprises two photoelectric sensors, one of which is arranged at a position corresponding to the upper side of the long metal pipe 10, and the other of which is symmetrically arranged at a position corresponding to the lower side of the long metal pipe 10. When the blanking sensor 25 senses that the long metal pipe 10 is absent, a starting signal is sent to the blanking mechanism. The second conductive contact 26 is arranged to contact the outer surface of the long metal pipe 10 passing through. In the present embodiment, the second conductive contact is a brush-like wire end. The first conductive contact 333 and the second conductive contact 26 constitute a control switch for controlling the two roller mechanisms to move away from and approach each other. The numerical control system controls the roller mechanisms according to the contact state of the first conductive contact 333 and the second conductive contact 26 with the long metal pipe 10. When the first conductive contact 333 and the second conductive contact 26 simultaneously contact the long metal pipe 10, a signal is sent to make the rollers 21 of the two roller mechanisms move away from each other, the two rollers 21 release the long metal pipe 10 to stop conveying, the laser cutting head 31 of the laser cutting device 3 starts cutting, and after the metal pipe section 101 is cut, the positioning baffle 332 moves to the left, and after the metal pipe section 101 falls onto the first conveying belt 44 and then moves to the right to the original position, the end of the long metal pipe 10 is not in contact with the first conductive contact 333, a signal is sent to make the rollers 21 of the two roller mechanisms approach each other, and the two rollers 21 clamp and convey the long metal pipe 10, so as to realize the circulation.

[0043] As Figure 5 and Figure 6As shown, in the present embodiment, the automatic aligning feeding device 5 comprises a hopper 51, an aligning pushing mechanism and a second conveying belt 56. The hopper 51 is arranged at the left end of the first conveying belt 4, and the metal pipe sections 101 transported by the first conveying belt 4 can fall into the hopper 51. The hopper 51 has the function of temporarily storing the metal pipe sections 101, which reduces the requirement for the cutting speed of the laser cutting device 3 to be synchronized with the speed of the chamfering device 7, and after the long metal pipe 10 to be cut is cut, the operation of the roller feeding device 2 and the laser cutting device 3 can be stopped first, which saves energy consumption and does not affect the chamfering and polishing of the subsequent metal pipe sections 101. The second conveying belt 56 is arranged above the rear side of the hopper 51. The aligning pushing mechanism comprises a first aligning plate 53, a second aligning plate 54, an interval plate 2 and an aligning cylinder 55. The interval plate 2 is arranged at a rear side position in the hopper 51 in a backward inclined manner. The first aligning plate 53 and the second aligning plate 54 are arranged at the front side and the rear side of the interval plate 2 respectively and are parallel to the interval plate 2. The aligning cylinder 55 is fixed at an outer side position of the rear wall of the hopper 51. The first aligning plate 53 and the second aligning plate 54 are connected with the aligning cylinder 55 and are driven by the aligning cylinder 55 to move up and down along the interval plate 2. The top surface of the interval plate 2 is arranged at a height of one half of the height between the bottom of the hopper 51 and the second conveying belt 56. The top surface of the first aligning plate 53 and the top surface of the second aligning plate 54 are arranged such that when the top surface of the first aligning plate 53 descends to the bottom of the hopper 51, the top of the second aligning plate 54 descends to a position where the top of the second aligning plate 54 is flush with the top surface of the interval plate 2. When the top surface of the first aligning plate 53 ascends to a position where the top surface of the first aligning plate 53 is flush with the top surface of the interval plate 2, the top of the second aligning plate 54 ascends to a position where the top of the second aligning plate 54 is flush with the second conveying belt 56.

[0044] As Figure 7As shown, in the present embodiment, the pipe joint sensing and pushing device 6 is arranged at the left end of the second conveying belt 56. The pipe joint sensing and pushing device 6 comprises a contact sensor 62, a proximity sensor 63 and a pipe joint pushing cylinder 61. The contact sensor 62 is arranged at the left end of the second conveying belt 56 to provide a start signal for the pipe joint pushing cylinder 61. When the pipe joint pushing cylinder 61 receives the signal, the cylinder shaft of the pipe joint pushing cylinder 61 is pushed forward. In the present embodiment, the contact sensor 62 is a pressure sensor. When the left end of the metal pipe joint 101 conveyed by the second conveying belt 56 moves leftward and contacts the pressure sensor, the pressure sensor sends a signal. The pipe joint pushing cylinder 61 is arranged at the front side of the left end of the second conveying belt 56. The proximity sensor 63 is arranged in front of the pipe joint pushing cylinder 61, i.e. above the end of the pipe joint guide plate 64 arranged at the rear side of the second conveying belt 56 and close to the pipe joint pushing cylinder 61, to provide a stop signal for the pipe joint pushing cylinder 61. The proximity sensor 63 can be an inductive proximity sensor. When the metal pipe joint 101 passes by, the proximity sensor 63 sends a stop signal to the pipe joint pushing cylinder 61, i.e. the cylinder shaft of the pipe joint pushing cylinder 61 is retracted backward. In addition, when the pipe joint guide plate 64 is full of metal pipe joints 101, the proximity sensor 63 continuously senses the metal pipe joints 101 and continuously sends a stop signal to the pipe joint pushing cylinder 61. Even if the contact sensor 62 senses that the second conveying belt 56 has conveyed the metal pipe joint 101, the stop state of the pipe joint pushing cylinder 61 is maintained, so that the metal pipe joint 101 is prevented from being continuously pushed into the pipe joint guide plate 64 by the pipe joint pushing cylinder 61, which causes the metal pipe joints 101 in the pipe joint guide plate 64 to be squeezed or even overflow, thereby having a protection effect.

[0045] As Figure 8As shown, in the embodiment, the chamfering device 7 comprises a wheel disc 71, a rotating positioning device 72 and a chamfering assembly 73. The wheel disc 71 is vertically arranged, and a semicircular notch corresponding to the circumferential shape of the metal pipe section 101 is arranged on the circumferential surface of the wheel disc 71. The rotating positioning device 72 is arranged above the wheel disc 71 and can press the metal pipe section 101 downward. In the embodiment, the rotating positioning device 72 is a pressing rod, and a curved surface matched with the circumferential surface of the wheel disc 71 is arranged on the side of the pressing rod facing the wheel disc 71. The chamfering assembly 73 is arranged on the left and right sides of the wheel disc 71, and the two groups of chamfering assemblies 73 are staggered, i.e., the two groups of chamfering assemblies 73 do not chamfer the two ends of the same metal pipe section 101 at the same time, so that the shaking of the metal pipe section 101 during chamfering due to burrs on the two ends of the metal pipe section 101 can be avoided. The feeding position of the wheel disc 71 is matched with the rear end position of the pipe section guide plate 64, and the rear end of the pipe section guide plate 64 is arranged to be lower than the front end, i.e., the pipe section guide plate 64 is close to the one end of the pipe section pushing cylinder 61, so that the metal pipe section 101 can roll down along the pipe section guide plate 64 under the action of gravity and enter the wheel disc 71. The discharging position of the wheel disc 71 is provided with a third conveying belt 8, the third conveying belt 8 can transport the metal pipe section 101 falling thereinto to the polishing device 9 arranged on the left side of the chamfering device 7 for polishing. The polishing device 9 is provided with a discharging port, and the polished metal pipe section 101 is discharged from the discharging port.

[0046] As shown in the drawings, Figure 9 In the embodiment, the polishing device 9 is provided with a fourth conveying belt 91 matched with the third conveying belt 8. The rear side of the fourth conveying belt 91 is provided with a polishing wheel 92 and a polishing wheel driving motor driving the polishing wheel 92 to rotate. The front side of the fourth conveying belt 91 is provided with an auxiliary wheel 93 at a position corresponding to the polishing wheel 92.

[0047] Embodiment 2

[0048] As shown in the drawings, Figure 4As shown, the structure of the embodiment is similar to that of Embodiment 1, and the difference lies in that the laser cutting device 3 further comprises a cutting positioning mechanism 34, which is arranged at the front side of the outlet position of the pipe feeding channel, and the cutting positioning mechanism 34 comprises a cutting positioning plate 341, a cutting cylinder 342 and a base 343. The cutting positioning plate 341 is connected with the cutting cylinder 342 and can be driven by the cutting cylinder 342 to move forward and backward. The cutting cylinder 342 is fixed on the base 343, and the base 343 is slidably connected with the second guide rail shaft 336 and can slide left and right along the second guide rail shaft 336. The base 343 is provided with a second tightness adjusting mechanism which can adjust the tightness of the base 343 and the second guide rail shaft 336. The second tightness adjusting mechanism comprises a clamping block and a screw. The clamping block is provided with a clamping opening matched with the circumferential shape of the guide rail shaft. The screw is threadedly connected through the base 343 and the clamping block. The tightness of the base 343 and the guide rail shaft is adjusted by screwing the screw to adjust the tightness of the clamping block and the guide rail shaft. The function of the cutting positioning mechanism 34 is to block the end of each new long metal pipe 10 entering the laser cutting device 3, so that the distance between the end face and the laser cutting head 31 is much shorter than the length of the metal pipe section 101 to be cut. The cutting of the waste pipe section can not only ensure that the two ends of each cut metal pipe section 101 are flat, but also reduce the length of the waste pipe section and reduce the overall material loss.

[0049] As Figure 3As shown, in the present embodiment, the pushing mechanism 14 further comprises a pipe end positioning plate 144 and a second set of photoelectric sensors 146, the pipe end positioning plate 144 is vertically fixed on the upper surface of the guide rail 141 of the pushing plate 142, the first set of photoelectric sensors 145 is arranged on the right side of the pipe end positioning plate 144, and the second set of photoelectric sensors 146 is arranged on the left side of the pipe end positioning plate 144. The second set of photoelectric sensors 146 includes two photoelectric sensors which are symmetrically arranged on the front and rear sides above the guide rail 141 of the pushing plate 142. The first set of photoelectric sensors 145 is used to sense whether there is a long metal pipe 10 on the supporting plate 15, and sends a starting signal to the pushing cylinder 143 to push the long metal pipe 10 for feeding. When the end of the long metal pipe 10 is away from the first set of photoelectric sensors 145, the front end of the long metal pipe 10 has entered the roller feeding device 2 and is in contact with the end of the previous long metal pipe 10, and the long metal pipe 10 is conveyed by the roller feeding device 2 to the laser cutting device 3, and the pushing cylinder 143 drives the pushing plate 142 to return to the original position for the next feeding. When the second set of photoelectric sensors 146 senses that the end of the long metal pipe 10 is away from the second set of photoelectric sensors 146 for the first time, the tail of the previous long metal pipe 10 has just been separated from the loose rotating chuck 32, and the roller feeding device 2 sends a reverse rotation signal to convey the long metal pipe 10 to the right until the end of the long metal pipe 10 is in contact with the pipe end positioning plate 144. The second set of photoelectric sensors 146 senses the long metal pipe 10 again, and sends a signal to the roller feeding device 2 to convey the long metal pipe 10 to the laser cutting device 3, and the cutting positioning mechanism 34 of the laser cutting device 3 starts to cut the end waste of the newly entered long metal pipe 10.

[0050] Embodiment 3

[0051] The structure of the present embodiment is similar to that of embodiment 2, and the difference lies in that the blanking baffle 12 is provided with a long strip-shaped through hole, and the blanking baffle 12 is connected with the pipe supporting plate 11 through the screw penetrating through the long strip-shaped through hole. In this way, by adjusting the distance between the blanking baffle 12 and the upper edge of the pipe placing channel 111 through the loose screw, the blanking of the long metal pipe 10 with different outer diameters can be adapted.

[0052] The above-described embodiments of the present application do not constitute a limitation on the protection scope of the present application. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A fruit and vegetable peeler metal tube section handle automatic processing production line, characterized in that, It includes the storage device (1), the roller feeding device (2), the laser cutting device (3), the automatic straightening feeding device (5), the pipe joint induction pushing device (6), the chamfering device (7) and the polishing device (9), wherein: The storage device (1) includes a rack, a supporting plate (15), a falling mechanism and a pushing mechanism (14), the rack is used for placing long metal pipes (10), the falling mechanism is arranged on the rack and can push the long metal pipes (10) to fall on the supporting plate (15), and the pushing mechanism (14) is arranged at the right end of the supporting plate (15) and can push the long metal pipes (10) falling on the supporting plate (15) to move towards the roller feeding device (2), wherein the pushing mechanism (14) comprises a push plate guide rail (141), a push plate (142), a pushing cylinder (143), a pipe end positioning plate (144), a first group of photoelectric sensors (145) and a second group of photoelectric sensors (146), the push plate guide rail (141) is arranged on the extension line of the right end of the supporting plate (15) and cooperates with the supporting plate (15), the pushing cylinder (143) is fixed with the push plate guide rail (141), the push plate (142) is driven by the pushing cylinder (143) and can move along the push plate guide rail (141), the pipe end positioning plate (144) is vertically fixed on the upper surface of the push plate guide rail (141), the first group of photoelectric sensors (145) are arranged on the right side of the pipe end positioning plate (144), the second group of photoelectric sensors (146) are arranged on the left side of the pipe end positioning plate (144), the first group of photoelectric sensors (145) and the second group of photoelectric sensors each comprise two photoelectric sensors, the two photoelectric sensors are symmetrically arranged on the front and rear sides above the push plate guide rail (141), the first group of photoelectric sensors (145) are used for sensing whether there is a long metal pipe (10) on the supporting plate (15), sending a starting signal to the pushing cylinder (143) to push the long metal pipe (10) to feed, when the end of the long metal pipe (10) is separated from the first group of photoelectric sensors (145), at this time, the front end of the long metal pipe (10) has entered the roller feeding device (2) and is in contact with the end of the previous long metal pipe (10), the long metal pipe (10) is conveyed by the roller feeding device (2) towards the laser cutting device (3), the pushing cylinder (143) drives the push plate (142) to return to the original position for the next feeding, when the end of the long metal pipe (10) is separated from the second group of photoelectric sensors (146) for the first time, at this time, the tail of the previous long metal pipe (10) has just separated from the loose rotating chuck (32), a reverse rotating signal is sent to the roller feeding device (2) to convey the long metal pipe (10) to the right until the end of the long metal pipe (10) is in contact with the pipe end positioning plate (144), the second group of photoelectric sensors (146) senses the long metal pipe (10) again, a signal is sent to the roller feeding device (2) to convey the long metal pipe (10) towards the laser cutting device (3), and the cutting positioning mechanism (34) of the laser cutting device (3) starts to cut the end waste of the newly entered long metal pipe (10). The laser cutting device (3) is arranged on the left side of the storage device (1), and the laser cutting device (3) comprises a loose and tight rotating chuck (32), a laser cutting head (31) and a pipe material induction positioning mechanism (33). The loose and tight rotating chuck (32) is provided with a pipe material feeding channel, the loose and tight rotating chuck (32) can clamp and rotate the long metal pipe (10) passing through the pipe material feeding channel, the laser cutting head (31) is installed above the outlet position of the pipe material feeding channel, the pipe material induction positioning mechanism (33) is arranged on the left side of the pipe material feeding channel and can be adjusted in position left and right, the pipe material induction positioning mechanism (33) is provided with a positioning baffle (332), the positioning baffle (332) is provided with a first conductive contact (333), the long metal pipe (10) is blocked and positioned by the positioning baffle (332) after entering from the pipe material feeding channel and can contact the first conductive contact (333), the long metal pipe (10) is cut into a metal pipe section (101) by the laser cutting head (31) and falls into the first conveying belt (4) arranged below the pipe material feeding port, and the first conveying belt (4) can transport the metal pipe section (101) to the left side of the pipe material feeding channel; The roller feeding device (2) is arranged between the supporting plate (15) and the laser cutting device (3), and the roller feeding device (2) comprises a roller mechanism, a roller driving motor (24), a blanking sensor (25) and a second conductive contact (26). The roller mechanism comprises a roller (21), the roller (21) is driven to rotate by the roller driving motor (24), the number of the roller mechanism is two, and the two roller mechanisms are arranged at the front and rear positions corresponding to the supporting plate (15) and can approach and move away from each other, so that the roller (21) can clamp and release the long metal pipe (10) passing through. The blanking sensor (25) is arranged between the two roller mechanisms and is used for sensing the long metal pipe (10), and when the blanking sensor (25) senses that the long metal pipe (10) is absent, a starting signal is sent to the blanking mechanism. The second conductive contact (26) is arranged to contact the outer surface of the long metal pipe (10) passing through. The first conductive contact (333) and the second conductive contact (26) constitute a control switch for controlling the two roller mechanisms to move away from and approach each other; The automatic straightening and feeding device (5) comprises a hopper (51), a straightening and pushing mechanism and a second conveying belt (56). The hopper (51) is arranged at the left end of the first conveying belt (4), and the metal pipe section (101) transported by the first conveying belt (4) can fall into the hopper (51). The straightening and pushing mechanism is arranged to transport the metal pipe section (101) in the hopper (51) to the second conveying belt (56) arranged above the rear side of the hopper (51); The pipe section induction pushing device (6) is arranged at the left end of the second conveying belt (56), and the pipe section induction pushing device (6) is arranged to be able to sense the metal pipe section (101) and push the metal pipe section (101) away from the second conveying belt (56) in a horizontal direction perpendicular to the conveying direction of the second conveying belt (56). The chamfering device (7) comprises a wheel disc (71), a rotating positioning device (72) and a chamfering assembly (73), the wheel disc (71) is vertically arranged, and semicircular notches corresponding to the circumferential shape of the metal pipe section (101) are arranged on the circumferential surface of the wheel disc (71) at intervals, the rotating positioning device (72) is arranged above the wheel disc (71) and can press the metal pipe section (101) downward, the chamfering assembly (73) is arranged on the left and right sides of the wheel disc (71), a pipe section guide plate (64) is arranged at the feeding position of the wheel disc (71), the pipe section guide plate (64) can catch the metal pipe section (101) pushed by the pipe section induction and pushing device (6), a third conveying belt (8) is arranged at the discharging position of the wheel disc (71), the third conveying belt (8) can transport the metal pipe section (101) falling thereinto to the polishing device (9) arranged on the left side of the chamfering device (7) for polishing, and the polishing device (9) is provided with a discharging port, and the polished metal pipe section (101) is discharged from the discharging port.

2. The fruit and vegetable peeler metal tube section handle automatic processing production line according to claim 1, characterized in that, The rack comprises a base frame and a plurality of vertically arranged pipe support plates (11), the pipe support plates (11) are fixed on the base frame at intervals in the horizontal direction, the pipe support plates (11) are provided with pipe placing channels (111) which are inclined transversely in the front-rear direction, the pipe placing channels (111) are connected with vertically arranged pipe discharging channels (112), the discharging mechanism comprises a discharging baffle (12) and a discharging cylinder (13), the discharging baffle (12) is connected with the pipe support plates (11), the top end of the discharging baffle (12) extends into the pipe placing channel (111), and the distance from the top end of the discharging baffle (12) to the upper edge of the pipe placing channel (111) is greater than the outer diameter of the long metal pipe (10), the discharging cylinder (13) is arranged below the pipe placing channel (111) and is fixed with the pipe support plates (11), and the discharging cylinder (13) can push the long metal pipe (10) upward so that the long metal pipe (10) can fall from the pipe discharging channel (112) by overcoming the top end of the discharging baffle (12), and the supporting plate (15) is arranged at the outlet position of the pipe discharging channel (112).

3. The fruit and vegetable peeler metal tube section handle automatic processing production line according to claim 2, characterized in that, The discharging baffle (12) is connected with the pipe support plates (11) by screws penetrating through the long strip-shaped through holes.

4. The fruit and vegetable peeler metal tube section handle automatic processing production line according to claim 1, characterized in that, The roller mechanism further comprises a bottom plate (22) and a pushing cylinder (23), the roller (21) is mounted on the bottom plate (22), and the bottom plate (22) is connected with the pushing cylinder (23) and is driven by the pushing cylinder (23).

5. The fruit and vegetable peeler metal tube section handle automatic processing production line according to claim 1, characterized in that, The pipe induction positioning mechanism (33) further comprises a positioning cylinder (331), an adjusting plate (334), a first guide rail shaft (335) and a second guide rail shaft (336), the positioning cylinder (331) is fixed on the adjusting plate (334), the positioning baffle (332) is connected with the positioning cylinder (331) and is driven by the positioning cylinder (331) to move left and right, the first guide rail shaft (335) and the second guide rail shaft (336) are arranged left and right and are fixed with the laser cutting device (3), the adjusting plate (334) is slidably connected with the first guide rail shaft (335) and the second guide rail shaft (336) and can slide left and right along the first guide rail shaft (335) and the second guide rail shaft (336), and the adjusting plate (334) is provided with a first tightness adjusting mechanism for adjusting the tightness of the adjusting plate (334) and the first guide rail shaft (335) and the second guide rail shaft (336).

6. The fruit and vegetable peeler metal tube section handle automatic processing production line according to claim 5, characterized in that, The laser cutting device (3) further comprises a cutting positioning mechanism (34), the cutting positioning mechanism (34) is arranged on the front side of the outlet position of the pipe feeding channel, the cutting positioning mechanism (34) comprises a cutting positioning plate (341), a cutting cylinder (342) and a base (343), the cutting positioning plate (341) is connected with the cutting cylinder (342) and is driven by the cutting cylinder (342) to move forward and backward, the cutting cylinder (342) is fixed on the base (343), the base (343) is slidably connected with the second guide rail shaft (336) and can slide left and right along the second guide rail shaft (336), and the base (343) is provided with a second tightness adjusting mechanism for adjusting the tightness of the base (343) and the second guide rail shaft (336).

7. The fruit and vegetable peeler metal tube section handle automatic processing production line according to claim 1, characterized in that, The pipe joint induction pushing device (6) comprises a contact sensor (62), a proximity sensor (63) and a pipe joint pushing cylinder (61), the contact sensor (62) is arranged at the left end of the second conveying belt (56) to provide a starting signal for the pipe joint pushing cylinder (61), the proximity sensor (63) is arranged at one end of the pipe joint guide plate (64) close to the pipe joint pushing cylinder (61) to provide a stop signal for the pipe joint pushing cylinder (61), and the pipe joint pushing cylinder (61) is arranged at a front position close to the left end of the second conveying belt (56).

8. The fruit and vegetable peeler metal tube section handle automatic processing production line according to claim 1, characterized in that, The polishing device (9) is provided with a fourth conveying belt (91) matched with the third conveying belt (8), the rear side of the fourth conveying belt (91) is provided with a polishing wheel (92) and a polishing wheel driving motor for driving the polishing wheel (92) to rotate, and the front side of the fourth conveying belt (91) is provided with an auxiliary wheel (93) at a position corresponding to the polishing wheel (92).

9. The automatic processing production line of the metal tube joint handle of the fruit and vegetable peeler according to any one of claims 1 to 8, characterized in that, The said straightening pushing mechanism (14) comprises a first straightening plate (53), a second straightening plate (54), an interval plate (52) and a straightening cylinder (55), the interval plate (52) is set in a rear position in the hopper (51) with a backward inclination, the first straightening plate (53) and the second straightening plate (54) are respectively set on the front side and the rear side of the interval plate (52) in parallel with the interval plate (52), the straightening cylinder (55) is fixed on the rear position outside the hopper (51), the first straightening plate (53) and the second straightening plate (54) are connected with the straightening cylinder (55) and can move up and down driven by the straightening cylinder (55), the top surface height of the interval plate (52) is set as one half of the height between the bottom of the hopper (51) and the second conveying belt (56), the top surface of the first straightening plate (53) and the top surface of the second straightening plate (54) are set so that when the top surface of the first straightening plate (53) drops to the bottom of the hopper (51), the top of the second straightening plate (54) drops to the position in which the top surface of the second straightening plate (54) is flush with the top surface of the interval plate (52), and when the top surface of the first straightening plate (53) rises to the position in which the top surface of the first straightening plate (53) is flush with the top surface of the interval plate (52), the top of the second straightening plate (54) rises to the position in which the top of the second straightening plate (54) is flush with the second conveying belt (56).

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