CN104690182B - Feeding assembly of bending machine - Google Patents

Abstract

The invention relates to a feeding assembly of a bending machine, which comprises a feeding rack, wherein the feeding rack is provided with a feeding platform for bearing a workpiece to be bent and a feeding conveying assembly which is arranged on the feeding rack and can push the workpiece to be bent borne on the feeding platform; the feeding platform or the feeding frame is provided with a material poking mechanism which can push a workpiece to be bent and loaded on the feeding platform; when the feeding platform is positioned at a feeding position, the feeding conveying assembly pushes a workpiece to be bent; when the feeding platform is located at a discharging position, the workpiece to be bent is pushed by the material pushing mechanism. The feeding platform can be accurately butted with a main machine of an external bending machine, and the problem that the feeding platform cannot be accurately butted with the main machine of the external bending machine due to various errors such as assembly errors is solved.

Description

Feeding components for bending machines

technical field

The invention relates to a feeding assembly of a bending machine.

Background technique

As a compact heat exchanger, the tube-fin heat exchanger has a wide range of applications in the refrigeration industry. The forming process of the heat exchanger mainly has the following three forming processes: tube bending forming (forming U-shaped tubes), mechanical expanding tube forming (realizing tube-fin connection), tube bundle bending forming (forming L-shaped or G-shaped heat exchangers) ). Tube bundle bending is one of the key processes in heat exchanger forming, which has an important impact on the performance of heat exchangers.

When the tube bundle is bent and formed, the heat exchanger is first transported to the specified position, so that the part to be bent is close to the bending die (roller) with a predetermined bending radius, and then clamped on both sides of the bending die The heat exchanger makes the clamping parts on one side or both sides rotate and move around the bending die, so the heat exchanger is extruded into a specified bending angle along the bending die. More specifically, the heat exchanger is fed into the bending machine longitudinally in a flat state, and then the part to be bent is placed against the bending die in the transverse direction, the bending die is placed above the part to be bent, and the front end of the heat exchanger is clamped Between the bending die and the clamping die (lower platen), while the tail end is supported by the bottom plate (follower plate), the actuator is driven to rotate the bending die and the clamping die at a specified angle as required, and the clamping die is lifted to make The front section of the heat exchanger rotates around the center of the bending die to form along the bending die.

In the traditional tube bundle bending forming process, most of the heat exchangers to be bent are manually transported to the bending die in the main machine of the bending machine through the input end of the main machine of the bending machine, and then bent and formed. The working efficiency of the method is low and the labor intensity is high.

Contents of the invention

The object of the present invention is to provide a feeding assembly of a bending machine which reduces labor intensity and improves work efficiency.

The above-mentioned purpose is achieved through the following technical solutions:

A feeding assembly of a bending machine, including a feeding frame, the feeding frame is provided with a loading platform for carrying workpieces to be bent and a loading platform installed on the feeding frame and can be pushed and carried on the upper frame. The feeding and conveying assembly of the workpiece to be bent on the feeding platform, a feeding lifting mechanism is provided between the feeding frame and the feeding platform, and the feeding lifting mechanism drives the feeding platform at a feeding position and a discharging position rise or fall between; the loading platform or the loading frame is provided with a material shifting mechanism that can push the workpiece to be bent carried on the loading platform; when the loading platform is in the feeding position, it is conveyed by the feeding The component pushes the workpiece to be bent; when the loading platform is in the discharge position, the material pushing mechanism pushes the workpiece to be bent.

The feeding assembly of the bending machine disclosed in this technical solution carries the workpiece to be bent (for example, a heat exchanger to be bent) on the loading platform and is pushed by the material shifting mechanism or the feeding and conveying assembly to realize automation Transportation can reduce labor intensity and improve work efficiency; and the feeding platform is driven up or down by the feeding lifting mechanism to adjust the height of the feeding platform, so that the feeding platform can be accurately docked with the main machine of the external bending machine, so that the loading The whole process of conveying the workpiece to be bent from the material component to the main machine of the external bending machine and receiving materials from the main machine of the external bending machine is carried out stably and smoothly, which solves the problem that the loading platform cannot be connected with the external machine due to the existence of various errors such as assembly errors. The problem of accurate docking of the main machine of the bending machine; in addition, the use of independent material shifting mechanism and feeding and conveying components to realize that the feeding platform can still push the workpiece to be bent normally at different heights.

The above technical scheme can be further improved through the following measures:

The loading platform has a feeding conveying path, and the workpiece to be bent is pushed by the material shifting mechanism or the feeding conveying assembly to move along the feeding conveying path; when the feeding platform rises or falls, the feeding platform can be moved away from or close to the feeding Conveying component; when the loading platform is in the feeding position, the loading platform is close to the feeding and conveying component and the workpiece to be bent can be pushed by the feeding and conveying component; when the loading platform is in the discharging position, the loading platform is far away from the feeding and conveying components. Reasonable design and simple structure.

The feeding conveyor assembly includes a feeding conveyor belt, a feeding roller set and a feeding roller drive motor, the feeding conveyor belt is set on the feeding roller set, and the feeding roller set is driven to rotate by the feeding roller drive motor; the feeding There is an avoidance opening corresponding to the position of the feeding and conveying components on the platform. When the feeding platform is in the feeding position, the feeding conveyor belt exposes the feeding platform through the avoiding opening and can be connected with the bending machine carried on the feeding platform. The workpieces are in frictional contact. The structure of the feeding and conveying assembly disclosed in this technical solution is simple. Since the feeding and conveying assembly will not follow the lifting of the feeding platform, the feeding platform will move relative to the feeding and conveying assembly during the process of rising or falling. The avoidance port is designed on the loading platform for the combination of components, the design is reasonable, the structure is simple, and the layout space of the whole machine is reduced.

A feeding conveyor belt, a feeding roller group and a feeding roller drive motor form a set of feeding conveying unit. There are two rows, and the feeding conveying units of each row are arranged at intervals along the feeding conveying path. The multiple sets of feeding and conveying units disclosed in the technical solution can push the workpieces to be bent carried on the feeding platform more effectively and stably.

The feeding lifting mechanism includes four feeding turbine screw elevators installed on the feeding frame and a feeding lifting motor for driving the four feeding turbine screw elevators to move synchronously. The elevators are distributed at the four corners of the feeding platform, and a feeding transmission mechanism that can realize the synchronous action of the four feeding turbine screw elevators is provided between the feeding lifting motor and the four feeding turbine screw elevators.

The shifting mechanism is arranged on the feeding platform; the shifting mechanism includes a shifting bracket, a shifting guide mechanism arranged between the feeding platform and the shifting bracket for guiding the shifting of the shifting bracket, and a shifting guide mechanism arranged on the feeding platform Between the dial bracket and the dial driving mechanism for driving the dial bracket to translate, the swing frame pivoted on the dial bracket and following the shift rack to move in translation, arranged between the dial bracket and the swing frame to drive the swing The swing drive mechanism swings between an avoidance position and a push position, and the push piece is arranged on the swing frame and swings with the swing frame. When the swing frame swings, the push piece can be moved away from or close to the feeding platform; the swing frame is in the avoidance position. When the swing frame is in the push position, the push piece is close to the loading platform so that the push piece can resist the workpiece to be bent and Push the workpiece to be bent to translate. The material shifting mechanism disclosed in this technical solution has a simple structure and can rise or fall along with the feeding platform. The material shifting mechanism cooperates with the feeding conveying assembly to realize that the feeding platform can still push the workpiece to be bent normally at different heights.

The swing drive mechanism includes a swing cylinder, the cylinder body of which is hinged to the material shifting bracket; The shifting arm includes a fixed end and an extended end, the fixed end of the shifting arm is fixed on the shifting shaft, the extended end of the shifting arm is used for installing push pieces, and one end of the shifting link is fixed On the material dial rotating shaft, the other end of the material dial connecting rod is hinged with the piston rod of the swing cylinder. The technical solution is simple in structure, and is driven by a swing cylinder to facilitate control and adjustment.

A swing frame, a swing drive mechanism and a push piece form a set of material shifting unit, two sets of material shifting units are arranged on the material shifting bracket, and the two sets of material shifting units are symmetrically arranged on both sides of the material shifting bracket. Setting two sets of material pushing units can realize the pushing of workpieces to be bent with different lengths and sizes, which has a wide range of applications and strong flexibility.

When the swing frame is in the avoidance position, the distance between the push piece and the loading platform is greater than the thickness of the workpiece to be bent; when the swing frame is in the pushing position, the distance between the push piece and the loading platform is smaller than the thickness of the workpiece to be bent.

There are two pusher arms, the two pusher arms are arranged in parallel and at intervals, a push rod beam is installed between the extended ends of the two pusher arms, and the push piece is installed on the push rod crossbeam; the pusher bracket is a gantry frame Shaped, including a horizontal frame across the two sides of the feeding platform and two vertical racks, and a vertical frame is provided at both ends of the horizontal frame; the guiding mechanism includes two parallel to the feeding For the feeding guide rails of the conveying path, a feeding guide rail is respectively set on both sides of the feeding platform, a feeding stand is matched with a feeding guide rail, and the bottom of each feeding stand is slidably nested in its corresponding The feeding slider on the feeding guide rail; the swing driving mechanism includes a driving motor, a first dialing reducer, a second dialing reducer, a connecting shaft of the dialing reducer, a first dialing material drive shaft, a second material drive shaft, a first material gear, a second material gear, a first material rack and a second material rack; the material drive motor, the first The shifting speed reducer and the second shifting speed reducer are fixed on the shifting bracket, and the first shifting speed reducer and the second shifting speed reducer are respectively arranged at both ends of the shifting horizontal frame; the first shifting rack and the second shifting rack are respectively fixed on both sides of the feeding platform, and the first shifting rack and the second shifting rack are parallel to the feeding conveying path; the first shifting reducer has an input end, A first output end and a second output end, the input end of the first material shifting speed reducer is connected with the output shaft of the material shifting drive motor, the first output end of the first material shifting speed reducer is connected with the first material shifting drive shaft One end is connected, the first material shifting gear is installed on the other end of the first material shifting drive shaft, the first material shifting gear meshes with the first material shifting rack; the second material shifting reducer has an input end and an output end, The input end of the second dial reducer is connected to the second output end of the first dial reducer through the connecting shaft of the dial reducer to transmit power, and the output end of the second dial reducer is connected to the second output of the second dial drive shaft. One end is connected, the second material shifting gear is installed on the other end of the second material shifting drive shaft, and the second material shifting gear meshes with the second material shifting rack.

The above technical measures can be used one by one or in combination, as long as there is no conflict between them.

Compared with the prior art, the present invention has the following advantages: the present invention can realize automatic transportation, reduce labor intensity and improve work efficiency.

Description of drawings

Fig. 1 shows the three-dimensional schematic diagram of the present invention;

Fig. 2 shows the three-dimensional exploded schematic view of the present invention;

Fig. 3 shows the three-dimensional schematic diagram of the present invention after hiding the feeding platform and the material shifting mechanism;

Fig. 4 and Fig. 5 respectively show the three-dimensional schematic view of two different angles of the material shifting mechanism of the present invention;

Fig. 6 shows a three-dimensional exploded schematic view of the material shifting mechanism of the present invention;

Figure 7 shows a top view of the present invention;

Fig. 8 is a sectional view of A-A of Fig. 7, wherein the feeding platform is in the feeding position;

Fig. 9 is a sectional view of A-A of Fig. 7, wherein the loading platform is in the discharging position;

Fig. 10 is the B-B sectional view of Fig. 8;

Fig. 11 is the C-C sectional view of Fig. 9;

Fig. 12 shows the schematic diagram of the material shifting mechanism of the present invention in the pushing position;

Fig. 13 shows a schematic diagram of the shifting mechanism of the present invention in an avoidance position;

Fig. 14, Fig. 15 and Fig. 16 show schematic diagrams of the working principle of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

A feeding assembly of a bending machine as shown in FIGS. On the loading frame 1 and can push the loading and conveying component 3 of the workpiece to be bent carried on the loading platform;

A feeding elevating mechanism 4 is provided between the feeding frame 1 and the feeding platform 2, and the feeding elevating mechanism 4 drives the feeding platform 2 to rise or fall between a feeding position and a discharging position; lower than the discharge position;

The feeding platform 2 or the feeding frame 1 is provided with a material shifting mechanism 5 that can push the workpiece to be bent carried on the feeding platform 2;

The shifting mechanism 5 pushes the workpiece to be bent at the wrong time with the feeding and conveying assembly 3;

When the feeding platform 2 is at the feeding position, the workpiece to be bent is pushed by the feeding conveying assembly 3;

When the feeding platform 2 is in the discharging position, the workpiece to be bent is pushed by the material shifting mechanism 5 .

The material shifting mechanism 5 and the feeding and conveying assembly 3 push the workpiece to be bent at the wrong time, which means pushing the workpiece to be bent at a non-simultaneous time.

The workpiece to be bent may be, for example, a heat exchanger to be bent.

In order to overcome the problems existing in the manual feeding method, mechanical automatic feeding equipment has appeared, but due to the existence of various errors such as assembly errors, it is difficult for the output end of the existing mechanical automatic feeding equipment to be accurately connected with the main machine of the bending machine. After assembly, the output end of the existing mechanical automatic feeding equipment is always higher or lower than the input end of the main machine of the bending machine. heater.

The feeding platform 2 has a feeding conveying path 21, and the workpiece to be bent is pushed by the dial mechanism 5 or the feeding conveying assembly 3 to move along the feeding conveying path 21; the direction shown by the arrow in Figure 1 is the workpiece to be bent Along the pushing direction of the feeding conveying path 21.

When the loading platform 2 rises or falls, the loading platform 2 can be kept away from or close to the feeding conveying assembly 3; 3 Push the workpiece to be bent; when the loading platform 2 is in the discharging position, the loading platform 2 is far away from the loading and conveying component 3 .

The feeding conveyor assembly 3 includes a feeding conveyor belt 31, a feeding roller group 32 and a feeding roller driving motor 33, the feeding conveyor belt 31 is set on the feeding roller group 32, and the feeding roller group 32 is driven by the feeding roller The motor 33 drives the rotation;

This loading platform 2 is provided with the avoidance port 22 corresponding to the position of the feeding conveying assembly 3, when the feeding platform 2 is in the feeding position, the feeding conveyor belt 31 exposes the feeding platform 2 through the avoidance port 22 and can be connected with The workpieces to be bent carried on the loading platform 2 are frictionally contacted to drive the workpieces to be bent to be fed along the feeding conveying path 21. In this embodiment, when the loading platform 2 is at the feeding position, the feeding conveyor belt 31 The upper layer (that is, the load layer) is basically flat on the top surface of the loading platform 2 (that is, the bearing surface for carrying the workpiece to be bent).

A feeding conveyor belt 31, a feeding roller group 32 and a feeding roller driving motor 33 form a set of feeding conveying unit, the feeding conveying assembly 3 includes multiple sets of feeding conveying units, and multiple sets of feeding conveying units are arranged There are two rows at intervals, and the feeding and conveying units of each row are arranged at intervals along the feeding and conveying path 21 . In this embodiment, there are six sets of feeding and conveying units, three sets in each row, and six avoidance openings 22 are provided on the feeding platform 2, and one avoiding opening 22 corresponds to the position of a set of feeding conveying units for feeding the set of materials. The infeed belt of the conveyor unit is exposed.

The feeding lifting mechanism 4 includes four feeding turbine screw lifters 41 installed on the feeding frame and a feeding lifting motor 42 for driving the four feeding turbine screw lifters 41 to move synchronously, and the feeding platform 2 is square, and four feeding turbine screw lifts 41 are distributed on the four corners of the feeding platform 2. Between the feeding lifting motor 42 and the four feeding turbine screw lifts 41, four turbine screw lifts can be realized. Synchronous feeding transmission mechanism.

The liftable screw mandrels of four feeding turbine screw lifters 41 are pushed against the bottom of the feeding platform 2, and the feeding transmission mechanism includes three feeding lifting steering boxes 43 and seven feeding lifting transmission shafts 44, three upper The material lifting and turning boxes 43 are arranged at intervals along the line segment parallel to the feeding conveying path 21, and one of the feeding lifting and turning boxes 43 is located in the middle of the line segment, and the other two feeding lifting and turning boxes 43 are respectively located at the two ends of the line segment. The adjacent two feeding lifting steering boxes 43 are connected with a feeding lifting transmission shaft 44 respectively. The feeding lifting steering box 43 at the end cooperates with two feeding turbine screw elevators 41 respectively, and the worms that can input power of the feeding lifting steering box 43 at both ends and the corresponding two feeding turbine screw elevators 41 are respectively A feeding lifting transmission shaft 44 is connected.

The shifting mechanism 5 is located on the feeding platform 2;

The dialing mechanism 5 comprises a dialing bracket, a dialing guide mechanism arranged between the loading platform 2 and the dialing rack for guiding the translation of the dialing rack, and a dialing guide mechanism arranged between the feeding platform and the dialing rack for The dialing drive mechanism that drives the dialing bracket to move in translation, the swing frame that is pivotally arranged on the dialing rack and follows the shifting rack to translate, is arranged between the dialing bracket and the swinging frame to drive the swinging frame to an avoidance position (as shown in Figure 14 shown) and a push position (as shown in Figure 15), a swing drive mechanism that swings between the swing frame and a push piece 51 that is arranged on the swing frame and follows the swing frame. When the swing frame swings, the push piece 51 can be moved away from or close to the upper Material platform 2; the sliding direction of the material shifting bracket is parallel to the feeding conveying path;

When the swing frame is in the avoidance position, the push piece 51 is far away from the loading platform 2 so that the push piece 51 avoids the workpiece to be bent during translation;

When the swing frame is in the push position, the push piece 51 is close to the feeding platform 2 so that the push piece 51 can resist the workpiece to be bent and push the workpiece to be bent to translate when moving in translation.

The swing driving mechanism includes a swing cylinder 52, and the cylinder body of the swing cylinder 52 is hinged to the material dialing bracket;

The swing frame includes a shifting shaft 53, a shifting arm 54 and a shifting link 55. The shifting shaft 53 is pivotally arranged on the shifting bracket. The shifting arm 54 includes a fixed end 541 and an extended end 542. The fixed end 541 of the dialing arm is fixed on the dialing shaft 53, the extended end 542 of the dialing arm is used to install the pusher 51, and one end of the dialing connecting rod 55 is fixed on the dialing shaft 53. The other end of material connecting rod 55 is hinged with the piston rod of swing cylinder 51.

A swing frame, a swing driving mechanism and a push piece 51 form a set of material shifting unit, two sets of material shifting units are arranged on the material shifting bracket, and the two sets of material shifting units are symmetrically arranged on both sides of the material shifting bracket.

When the swing frame is in the avoidance position, the distance 511 between the push piece 51 and the loading platform is greater than the thickness h of the workpiece to be bent;

When the swing frame is at the pushing position, the distance 512 between the push piece 51 and the loading platform is smaller than the thickness h of the workpiece to be bent.

There are two pusher arms 54, the two pusher arms are arranged in parallel and spaced apart, a push rod beam 56 is installed between the extended ends of the two pusher arms, and the push piece 51 is installed on the push rod crossbeam 56;

The material shifting bracket is in the shape of a gantry, and includes a material shifting horizontal frame 57 and two material shifting vertical frames 58 across both sides of the feeding platform, and a material pushing vertical frame 58 is respectively arranged at the two ends of the material shifting horizontal frame 57;

The material shifting guide mechanism includes two feeding guide rails 59 parallel to the feeding conveying path 21, a feeding guide rail 59 is respectively arranged on both sides of the feeding platform 2, a material shifting stand 58 cooperates with a feeding guide rail 59, each The bottom of the material shifting stand 58 is provided with a feeding slider 581 slidably nested on its corresponding feeding guide rail 59;

This swinging drive mechanism comprises a dialing drive motor 61, a first dialing speed reducer 62, a second dialing speed reducer 63, a dialing speed reducer connecting shaft 64, a first dialing drive shaft 65, a first dialing speed reducer Two dial drive shafts 66, a first dial gear 67, a second dial gear 68, a first dial rack 69 and a second dial rack 60;

The shifting drive motor 61, the first shifting speed reducer 62 and the second shifting speed reducer 63 are fixed on the shifting bracket, and the first shifting speed reducer 62 and the second shifting speed reducer 63 are respectively arranged on the shifting the two ends of the horizontal frame 57;

The first shifting rack 69 and the second shifting rack 60 are respectively fixed on both sides of the feeding platform 2, and the first shifting rack 69 and the second shifting rack 60 are parallel to the feeding conveying path 21 ;

This first material shifting reducer 62 has an input end, a first output end and a second output end, the input end of the first material shifting speed reducer is connected with the output shaft of the material shifting drive motor 61, the first material shifting deceleration The first output end of the machine is connected with one end of the first material shifting drive shaft 65, the first material shifting gear 67 is installed on the other end of the first material shifting drive shaft 65, the first material shifting gear 67 is connected with the first material shifting rack 69 engaged;

This second dialing speed reducer 63 has an input end and an output end, and the input end of the second dialing material speed reduction machine 63 is connected with the second output end of the first dialing material speed reduction machine 62 through the dialing material speed reduction machine connecting shaft 64 so that Transmission power, the output end of the second dialing gear reducer 63 is connected with an end of the second dialing drive shaft 66, the second dialing gear 68 is installed on the other end of the second dialing drive shaft 66, the second dialing gear 68 Engage with the second shifting rack 60 .

The loading platform 2 is provided with two spaced workpiece guide rods 23 to be bent, the length direction of the two workpiece guide rods 23 is parallel to the feeding conveying path 21, and the two workpiece guide rods to be bent limit the feeding conveyance The distance between the path 21 and the guide rods 23 of the two workpieces to be bent can be equal to the width of the workpiece to be bent.

The working principle of the present invention is as follows:

As shown in Figure 14, the loading platform is first lowered to the feeding position, at this time, the workpiece 8 to be bent carried on the loading platform is pushed by the loading and conveying assembly 3 in the direction indicated by the arrow in Figure 14;

As shown in Figure 15, the feeding platform is driven by the feeding lifting mechanism to rise to the discharge position. At this time, the feeding platform is level with the receiving part 71 of the external bending machine 7, and the material to be bent carried on the feeding platform The workpiece 8 is pushed toward the external bending machine 7 by the material shifting mechanism 5 along the direction indicated by the arrow in Figure 15, and the feeding is completed;

During the process of pushing the workpiece 8 to be bent by the feeding and conveying assembly 3, the swing frame of the shifting mechanism 5 can be placed in an avoidance position (as shown in Figure 14), so that the pusher can avoid the moving workpiece 8 to be bent; or , when the feeding and conveying assembly 3 pushes the workpiece 8 to be bent to the set position and does not reach the material shifting mechanism 5, at this time, the material shifting mechanism 5 can be moved in the direction opposite to the direction indicated by the arrow in Figure 14, and the material shifting Mechanism 5 swing frame is in avoidance position;

As shown in Figures 15 and 16, the workpiece 8 to be bent can be pushed by one set of two sets of material pushing units, wherein, Figure 15 shows that the workpiece 8 to be bent is pushed by a set of material pushing units positioned at the front side. Workpiece 8, Fig. 16 shows that the workpiece 8 to be bent is pushed by a set of material shifting unit positioned at the rear side, and when the workpiece 8 to be bent is pushed by a set of material shifting unit positioned at the rear side, the workpiece 8 positioned at the front side The swing frame of a set of material shifting unit is in the avoidance position.

Claims (10)

1. A feeding assembly of a bending machine, including a feeding frame, which is provided with a feeding platform for carrying workpieces to be bent and a loading platform that is installed on the feeding frame and can be pushed and loaded The feeding and conveying component of the workpiece to be bent on the feeding platform is characterized in that: A feeding lifting mechanism is provided between the feeding frame and the feeding platform, and the feeding lifting mechanism drives the feeding platform to rise or fall between a feeding position and a discharging position; The feeding platform or the feeding frame is provided with a material shifting mechanism that can push the workpiece to be bent carried on the feeding platform; When the feeding platform is at the feeding position, the workpiece to be bent is pushed by the feeding conveying component; When the feeding platform is at the discharging position, the workpiece to be bent is pushed by the material shifting mechanism. 2. The feeding assembly of the bending machine according to claim 1, characterized in that: The loading platform has a feeding conveying path, and the workpiece to be bent is pushed by the material shifting mechanism or the feeding conveying assembly to move along the feeding conveying path; When the feeding platform is raised or lowered, the feeding platform can be kept away from or close to the feeding and conveying component; when the feeding platform is in the feeding position, the feeding platform is close to the feeding and conveying component, and the workpiece to be bent can be pushed by the feeding and conveying component; When the loading platform is at the discharging position, the loading platform is far away from the loading and conveying components. 3. The feeding assembly of the bending machine according to claim 2, characterized in that: The feeding and conveying assembly includes a feeding conveyor belt, a feeding roller group and a feeding roller driving motor, the feeding conveyor belt is set on the feeding roller group, and the feeding roller group is driven to rotate by the feeding roller driving motor; The feeding platform is provided with an avoidance port corresponding to the position of the feeding conveying assembly. When the feeding platform is in the feeding position, the feeding conveyor belt is exposed to the feeding platform through the avoidance port and can be connected with the conveyor belt carried on the feeding platform. Frictional contact of workpieces to be bent. 4. The feeding assembly of the bending machine according to claim 3, characterized in that: A feeding conveyor belt, a feeding roller group and a feeding roller drive motor form a set of feeding conveying unit. There are two rows, and the feeding conveying units of each row are arranged at intervals along the feeding conveying path. 5. The feeding assembly of the bending machine according to claim 2 or 3 or 4, characterized in that: The feeding lifting mechanism includes four feeding turbine screw elevators installed on the feeding frame and a feeding lifting motor for driving the four feeding turbine screw elevators to move synchronously. The elevators are distributed at the four corners of the feeding platform, and a feeding transmission mechanism that can realize the synchronous action of the four feeding turbine screw elevators is provided between the feeding lifting motor and the four feeding turbine screw elevators. 6. The feeding assembly of the bending machine according to claim 1 or 2 or 3 or 4, characterized in that: The feeding mechanism is set on the feeding platform; The shifting mechanism includes a shifting bracket, a shifting guide mechanism arranged between the feeding platform and the shifting bracket for guiding the translation of the shifting bracket, and a shifting guide mechanism arranged between the loading platform and the shifting bracket for driving the shifting The material shifting drive mechanism for the translation of the material support, the swing frame that is pivotally arranged on the material support and follows the translation of the material support, and is arranged between the material support and the swing frame to drive the swing frame between an avoidance position and a push position Swinging swing driving mechanism, push piece set on the swing frame and swinging with the swing frame, when the swing frame swings, the push piece can be moved away from or close to the loading platform; When the swing frame is in the avoidance position, the push piece is far away from the loading platform so that the push piece avoids the workpiece to be bent during translation; When the swing frame is in the pushing position, the push piece is close to the loading platform so that the push piece can resist the workpiece to be bent and push the workpiece to be bent to translate when moving in translation. 7. The feeding assembly of the bending machine according to claim 6, characterized in that: The swing driving mechanism includes a swing cylinder, and the cylinder body of the swing cylinder is hinged to the dial bracket; The swing frame includes a shifting shaft, a shifting arm and a shifting link. The shifting shaft is pivotally arranged on the shifting bracket. The shifting arm includes a fixed end and an extended end. The fixed end of the shifting arm Fixed on the dial shaft, the extended end of the dial arm is used to install the push piece, one end of the dial rod is fixed on the dial shaft, and the other end of the dial rod is hinged with the piston rod of the swing cylinder . 8. The feeding assembly of the bending machine according to claim 6, characterized in that: a swing frame, a swing drive mechanism and a push piece form a set of material shifting unit, and two sets of material shifting units are arranged on the material shifting bracket Unit, two sets of shifting units are symmetrically arranged on both sides of the shifting bracket. 9. The feeding assembly of the bending machine according to claim 6, characterized in that: When the swing frame is in the avoidance position, the distance between the push piece and the loading platform is greater than the thickness of the workpiece to be bent; When the swing frame is at the pushing position, the distance between the pushing piece and the feeding platform is smaller than the thickness of the workpiece to be bent. 10. The feeding assembly of the bending machine according to claim 7, characterized in that: There are two pusher arms, the two pusher arms are arranged in parallel and spaced apart, a push rod beam is installed between the extended ends of the two pusher arms, and the push piece is installed on the push rod crossbeam; The material shifting bracket is in the shape of a gantry frame, and includes a material shifting horizontal frame spanning both sides of the feeding platform and two material shifting stands, and a material shifting stand is respectively arranged at both ends of the material shifting horizontal frame; The feeding guide mechanism includes two feeding guide rails parallel to the feeding conveying path, a feeding guide rail is respectively arranged on both sides of the feeding platform, a feeding stand is matched with a feeding guide rail, and the bottom of each feeding stand There is a feeding slide block slidably nested on its corresponding feeding guide rail; The oscillating drive mechanism includes a material-turning drive motor, a first material-turning reducer, a second material-turning reducer, a connecting shaft of a material-turning reducer, a first material-turning drive shaft, and a second material-turning drive shaft , a first shifting gear, a second shifting gear, a first shifting rack and a second shifting rack; The material shifting drive motor, the first material shifting reducer and the second material shifting reducer are fixed on the material shifting bracket, and the first material shifting reducer and the second material shifting reducer are respectively arranged at both ends of the material shifting horizontal frame ; The first shifting rack and the second shifting rack are respectively fixed on both sides of the feeding platform, and the first shifting rack and the second shifting rack are parallel to the feeding conveying path; The first gear reducer has an input end, a first output end and a second output end, the input end of the first material gear reducer is connected with the output shaft of the material drive motor, the first material gear reducer The first output end is connected to one end of the first material shifting drive shaft, the first material shifting gear is installed on the other end of the first material shifting drive shaft, and the first material shifting gear meshes with the first material shifting rack; The second gear reducer has an input end and an output end, and the input end of the second material gear reducer is connected with the second output end of the first material gear reducer through the gear reducer connecting shaft to transmit power. The output end of the second dialing reducer is connected with one end of the second dialing drive shaft, the second dialing gear is installed on the other end of the second dialing drive shaft, and the second dialing gear meshes with the second dialing rack.