Terminal circulating feeding mechanism and circulating feeding method

Abstract

The invention provides a terminal circulating feeding mechanism and a circulating feeding method. The terminal circulating feeding mechanism comprises a circulating clamp library, a material returning unit, a switching unit, a first pushing unit and a second pushing unit. The circulating clamp library is provided with a circulating transmission track, and a terminal input port, a material returning station and a feeding station which correspond to the circulating transmission track, and the first pushing unit corresponds to the feeding station so as to push the terminal clamps on the clamp grooves to the feeding station; the second pushing unit corresponds to the material returning station so as to push the terminal clamp at the material returning station into the clamp groove; a transfer station is further arranged between the material returning station and the feeding station, and the switching unit drives the terminal clamp to be switched among the material returning station, the feeding station and the transfer station; and the material feeding and returning unit corresponds to the transfer station so as to be switched between the transfer station and the terminal processing station. Continuous operation of different terminals can be realized; and the operation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of mechanized production and processing, and in particular to a terminal circulating feeding mechanism and a circulating feeding method. Background Art

[0002] When producing power cables, data cables and other wires, it is necessary to crimp terminals. Traditional crimp terminals are chain terminals. A tray of terminal materials requires a set of fixed chain crimping dies. During the production process, the terminal model needs to be frequently changed, and the corresponding dies also need to be replaced. When the terminal material needs to be replaced, the die needs to be replaced manually. Changing the die affects the production efficiency during the production process, and the terminal crimping parameters also need to be readjusted. Summary of the invention

[0003] To this end, the present invention provides a terminal circulating feeding mechanism and a circulating feeding method based on cutting a plurality of chain terminals into individual terminals in bulk form; it is capable of circulating feeding terminals of a plurality of different specifications to solve the problem of reduced production efficiency caused by replacing terminal materials of chain terminals.

[0004] To achieve the above purpose, the technical solution provided by the present invention is as follows:

[0005] A terminal circulation feeding mechanism comprises a circulation fixture library, a return material unit, a switching unit, a first pushing unit and a second pushing unit; the circulation fixture library has a circulation transmission track and a terminal input port, a return material station and a feeding station corresponding to the circulation transmission track, the circulation transmission track is a closed and circulation transmission track, a plurality of fixture slots are arranged on the circulation transmission track, and the circulation transmission of the circulation transmission track drives the fixture slots on it to correspond to the terminal input port, the return material station or the feeding station; the first pushing unit corresponds to the feeding station to push the terminal fixture on the fixture slot to the feeding station, and the second pushing unit corresponds to the return material station to push the terminal fixture at the return material station into the fixture slot; a transfer station is also arranged between the return material station and the feeding station, the switching unit comprises a switching driver and a switching carrier, the switching driver drives and connects the switching carrier to drive the switching carrier to switch between the return material station, the feeding station and the transfer station; the return material unit corresponds to the transfer station to switch between the transfer station and the terminal processing station.

[0006] Furthermore, the switching carrier is provided with a first accommodating groove and a second accommodating groove for accommodating the terminal clamp, and the switching driver drives the switching carrier to switch between a first position and a second position, and when in the first position, the first accommodating groove and the second accommodating groove respectively correspond to the feeding station and the transfer station; when in the second position, the first accommodating groove and the second accommodating groove respectively correspond to the transfer station and the return station.

[0007] Furthermore, the transfer station is an unsupported suspended station, and the material return unit directly carries the terminal fixture when it is in the transfer station.

[0008] Furthermore, a positioning boss is provided on the material return unit, and a positioning groove is provided at the bottom of the terminal clamp. When the terminal clamp is transferred from the feeding station to the transfer station, the positioning groove at the bottom is matched with the positioning boss of the material return unit to achieve positioning assembly.

[0009] Furthermore, the matching structure of the positioning boss and the positioning groove is a matching structure that is wide at the top and narrow at the bottom, so that the terminal clamp can be restricted on the material feeding unit.

[0010] Furthermore, a clamping boss is also provided on the material return unit, and the clamping boss can be movably switched between a clamping position close to the positioning boss and a loosened position away from the positioning boss; when the material return unit is in the transfer station, the clamping boss is restricted and is in the loosened position; the bottom of the terminal clamp is also provided with a clearance groove and a bayonet provided on the side wall of the clearance groove; when the terminal clamp is transferred from the feeding station to the transfer station, the clamping boss is inserted through the clearance groove at its bottom, and when the material return unit is separated from the transfer station, the clamping boss is switched to the clamping position and is clamped into the bayonet.

[0011] Furthermore, the material returning unit comprises a transmission rail and a bearing bracket installed on the transmission rail, the bearing bracket having a bearing head, and the positioning boss is formed on the bearing head; a slidable slider is also arranged in the bearing head, the slider is provided with the clamping boss protruding from the upper surface of the bearing head and an abutting boss protruding from the side surface of the bearing head, an elastic member is arranged between the slider and the bearing head, and the elastic member applies an elastic force to the slider in the direction of the positioning boss; when the material returning unit is in the transfer station, the abutting boss drives the clamping boss to switch to the released position through the restriction of the carrier block constituting the material returning station and the material feeding station; when the material returning unit leaves the transfer station, the abutting boss loses the restriction and drives the clamping boss to switch to the clamping position through the elastic member.

[0012] Furthermore, it also includes a correction unit, which is arranged on the transmission track of the feeding unit and has a correction channel for the terminal clamp to pass through.

[0013] Furthermore, it also includes a clamp opening unit, which includes a lifting drive and a driving block connected to the lifting drive, and the driving block corresponds to a circular transmission track at the position of the terminal input port; the lifting drive drives the driving block to press down the terminal clamp on the circular transmission track to open the terminal clamp.

[0014] A terminal circulation feeding method adopts the terminal circulation feeding mechanism described above; terminal clamps of different specifications are respectively placed in a plurality of clamp slots on a circulation transmission track, and the terminal clamps to be operated are transmitted to the position corresponding to the terminal input port through the circulation transmission track, and the terminal is inserted into the terminal clamp from the terminal input port by an external conveyor, and then the terminal clamp is transmitted to the position corresponding to the feeding station, and the terminal clamp is pushed out to the feeding station by a first pushing unit, and then the switching unit transfers the terminal clamp of the feeding station to the transfer station, and transfers the previous terminal clamp of the transfer station to the return station; the terminal clamp transferred to the transfer station is output to the terminal processing station for processing by a return material unit, and then transmitted back to the transfer station by the return material unit after completion; the terminal clamp transferred to the return material station is pushed back to the clamp slot on the circulation transmission track by a second pushing unit, so as to realize the circulation feeding operation of the terminal.

[0015] The technical solution provided by the present invention has the following beneficial effects:

[0016] 1. The terminal circulating feeding mechanism of the present application integrates terminal fixtures of different specifications through a circulating fixture library. When needed, the matching terminal fixtures can be output from the circulating fixture library; and it integrates terminal input, terminal fixture output and material return; it can realize continuous operation of different terminals; so as to improve operating efficiency.

[0017] 2. The setting of the return material unit enables it to effectively position the terminal fixture transferred to the transfer station, and automatically clamp the terminal fixture after leaving the transfer station to ensure stable transmission of the terminal fixture; the structural design is ingenious and simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure shows a top view of the terminal circulation feeding mechanism in the embodiment;

[0019] Figure 2 The figure shows a partial structural exploded schematic diagram of the terminal circulation feeding mechanism in the embodiment;

[0020] Figure 3 Shown Figure 2 A magnified schematic diagram of the middle A area;

[0021] Figure 4 The figure shows one of the positional relationships among the switching unit, the material return station, the transfer station and the material feeding station in the embodiment;

[0022] Figure 5 The figure shows a schematic diagram of the coordination structure of the material return unit and the correction unit in the embodiment;

[0023] Figure 6The figure shows a schematic structural diagram of a support bracket of a material return unit in an embodiment;

[0024] Figure 7 It is a partial structural exploded schematic diagram of the support bracket of the material return unit in the embodiment;

[0025] Figure 8 The figure shows a terminal clamp that clamps the terminal in the embodiment. DETAILED DESCRIPTION

[0026] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0027] In the description of the present invention, terms such as "up", "down", "left", "right", "front", "back", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0028] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0029] Reference Figures 1 to 7 As shown, a terminal circulating feeding mechanism provided in this embodiment includes a circulating fixture magazine 10, a return material unit 20, a switching unit 30, a first pushing unit 40 and a second pushing unit 50; the circulating fixture magazine 10 has a circulating transmission track 12 and a terminal input port 15, a return material station 17 and a feeding station 16 corresponding to the circulating transmission track 12, the circulating transmission track 12 is a closed and circulating transmission track, and a plurality of fixture slots 14 are arranged on the circulating transmission track 12, and the circulating transmission of the circulating transmission track 12 drives the fixture slots 14 thereon to correspond to the terminal input port 15, the return material station 17 or the feeding station 16; as in this embodiment, in the transmission direction of the circulating transmission track 12, the terminal input port 15, the return material station 17 and the feeding station 17 are arranged in sequence; of course, in other embodiments, the positions of the return material station 17 and the feeding station 16 can be swapped.

[0030] The first pushing unit 40 corresponds to the feeding station 16 to push the terminal fixture 100 on the fixture slot 14 to the feeding station 16 , and the second pushing unit 50 corresponds to the return station 17 to push the terminal fixture 100 of the return station 17 into the fixture slot 14 .

[0031] A transfer station 18 is also arranged between the return station 17 and the feeding station 16, and the switching unit 30 includes a switching driver 31 and a switching carrier 32, and the switching driver 31 drives and connects the switching carrier 32 to drive the switching carrier 32 to switch between the return station 17, the transfer station 18 and the feeding station 16; the return material unit 20 corresponds to the transfer station 18 to switch between the transfer station 18 and the terminal processing station 19 (i.e., the position where the terminal is processed).

[0032] The present embodiment also provides a terminal circulation feeding method, which is one of the operation methods based on the above-mentioned terminal circulation feeding mechanism; before operation, terminal clamps 100 of different specifications are respectively placed in a plurality of clamp slots 14 on the circulation transmission track 12, that is, one terminal clamp 100 is placed in each clamp slot 14; during operation, the terminal clamp 100 to be operated is transferred to the position corresponding to the terminal input port 15 through the circulation transmission track 12, and the terminal 200 is inserted into the terminal clamp 100 from the terminal input port 15 by an external conveyor, such as Figure 8 The terminal fixture 100 holding the terminal 200 is shown. The terminal fixture 100 is then transferred to the position corresponding to the feeding station 16, and is pushed out to the feeding station 16 by the first pushing unit 40. After that, the switching unit 30 transfers the terminal fixture 100 of the feeding station 16 to the transfer station 18, and transfers the previous terminal fixture of the transfer station 18 to the return station 17; the terminal fixture 100 transferred to the transfer station 18 is output to the terminal processing station 19 through the return material unit 20 for processing, and is then transferred back to the transfer station 18 by the return material unit 20 after completion; the terminal fixture 100 transferred to the return material station 17 is pushed back into the fixture slot 14 on the circulation transmission track 12 by the second pushing unit 50, so as to realize the cyclic feeding operation of the terminal.

[0033] The terminal circulating feeding mechanism of the present application integrates terminal fixtures 100 of different specifications together through a circulating fixture library 10. When needed, the matching terminal fixture 100 can be output from the circulating fixture library 10; and it integrates the input of terminals 200, the output of terminal fixtures 100 and the return of materials; it can realize continuous operation of different terminals 200, so as to improve working efficiency.

[0034] Furthermore, in this embodiment, the circulating fixture library 10 also includes a driving motor 13 and a support frame 11. The support frame 11 is mainly composed of two vertically arranged front and rear connecting plates. The circulating transmission track 12 is a circulating transmission belt. The circulating transmission track 12 is arranged in upper and lower layers and is placed between the two connecting plates. The driving motor 13 drives and connects the circulating transmission track 12 to drive the circulating transmission track 12 to circulate. A plurality of fixture slots 14 are distributed on the circulating transmission track 12 at equal intervals. The driving motor 13 is fixed to the connecting plate on the rear side, and two carrier blocks 111 are fixed to the outer end of the connecting plate on the front side. The two carrier blocks 111 respectively constitute the feeding station 16 and the return station 17. And three notches are also opened on the connecting plate on the front side, and the three notches are respectively the terminal input port 15, the first notch 191 corresponding to the feeding station 16, and the second notch 192 corresponding to the return station 17; for the corresponding terminal fixture 100 to pass through. The circulating fixture library 10 adopts the above structure, and the structural design is simple and easy to implement. Of course, other structures may be used in other embodiments as long as a transmission track for cyclic transmission can be obtained.

[0035] As for how to accurately find the corresponding terminal fixture 100 in the circulating fixture library 10, this is a prior art. For example, each fixture slot 14 can be numbered and the type of terminal fixture 100 carried can be recorded in real time for accurate output, such as the tool magazine system used for lathes in the prior art. It will not be elaborated here.

[0036] Specifically, in this embodiment, the first pushing unit 40 and the second pushing unit 50 both include an electric push rod and a push block, and the electric push rod is drivingly connected to the push block to drive the push block to push the terminal clamp 100 at the corresponding position.

[0037] The switching carrier 32 is provided with a first receiving groove 33 and a second receiving groove 34 for receiving the terminal clamp 100. The switching driver 31 drives the switching carrier 32 to switch between the first position and the second position. When in the first position, Figure 4In the state shown, the first receiving groove 33 and the second receiving groove 34 correspond to the feeding station 16 and the transfer station 18, respectively. When in the second position, the first receiving groove 33 and the second receiving groove 34 correspond to the transfer station 18 and the return station 17, respectively. That is, by setting the switching carrier 32, it is possible to switch between the three stations in pairs, that is, when the terminal fixture 100 of the feeding station 16 is output to the transfer station 18, the previous terminal fixture 100 is synchronously transferred from the transfer station 18 to the return station 17; the synchronous transfer method is simple in structure and high in efficiency. Of course, in other embodiments, the switching carrier 32 can also first transfer the previous terminal fixture 100 from the transfer station 18 to the return station 17, and then return to the feeding station 16, and output the terminal fixture 100 of the feeding station 16 to the transfer station 18; but this method is less efficient and is not preferred.

[0038] The transfer station 18 is an unsupported suspended station. When the return material unit 20 is in the transfer station 18, it directly carries the terminal clamp 100, that is, when the return material unit 20 retreats to the transfer station 18, the previous terminal clamp 100 returned thereon is directly transferred out from the return material unit 20, and the terminal clamp 100 transferred from the feeding station 16 is also directly assembled on the return material unit 20.

[0039] Furthermore, the feeding unit 20 is provided with a positioning boss 251. Figure 8 As shown, a positioning groove 101 is provided at the bottom of the terminal fixture 100. When the terminal fixture 100 is transferred from the feeding station 16 to the transfer station 18, the positioning groove 101 at the bottom thereof is matched with the positioning boss 251 of the feeding and returning unit 20 to achieve positioning and assembly, thereby ensuring the accuracy of the transfer of the terminal fixture 100. Specifically, the matching structure of the positioning boss 251 and the positioning groove 101 is a matching structure that is wide at the top and narrow at the bottom, so that the terminal fixture 100 can be limited on the feeding and returning unit 20, and can achieve a better limiting effect while positioning; as in this embodiment, the positioning boss 251 and the positioning groove 101 are both "T"-shaped structures. Of course, in other embodiments, they can also be inverted trapezoidal structures, etc.

[0040] Further preferably, a clamping boss 26 is further provided on the feeding return unit 20 , and the clamping boss 26 cooperates with the positioning boss 251 to clamp and fix the terminal fixture 100 , thereby further stabilizing the terminal fixture 100 .

[0041] Specifically, in this embodiment, the clamping boss 26 can be flexibly switched between a clamping position close to the positioning boss 251 and a release position away from the positioning boss 251; that is, when the clamping boss 26 is close to the positioning boss 251, it clamps the terminal clamp 100 together with the positioning boss 251, and when the clamping boss 26 is away from the positioning boss 251, the terminal clamp 100 is released.

[0042] At the same time, in order to further optimize the structure, when the feeding unit 20 is in the transfer station 18, the clamping boss 26 is restricted and in a loose position; the bottom of the terminal fixture 100 is also provided with a clearance groove 102 and a bayonet 103 provided on the side wall of the clearance groove 102; when the terminal fixture 100 is transferred from the feeding station 16 to the transfer station 18, the clamping boss 26 is inserted through the clearance groove 102 at the bottom thereof, and when the feeding unit 20 is separated from the transfer station 18, the clamping boss 26 is switched to the clamping position and is clamped into the bayonet 103. With such a configuration, it is sufficient to control the action of the feeding unit 20; there is no need to add an active driving device to control the action of the clamping boss 26.

[0043] The return material unit 20 includes a transmission rail and a supporting bracket 24 installed on the transmission rail. The supporting bracket 24 has a supporting head 25. The supporting head 25 is a structure for supporting the terminal clamp 100. The clamping boss 26 and the positioning boss 251 are both arranged thereon, wherein the positioning boss 251 and the supporting head 25 are an integrally connected structure. At the same time, the specific structure of the present embodiment to realize the above-mentioned action of the clamping boss 26 is as follows: a slidable slider 27 is also arranged in the supporting head 25, and the slider 27 is provided with the clamping boss 26 protruding from the upper surface of the supporting head 25 and an abutting convex shaft 271 protruding from the side surface of the supporting head 25, and an elastic member 28 (such as a spring) is arranged between the slider 27 and the supporting head 25, and the elastic member 28 applies an elastic force to the slider 27 in the direction of the clamping boss 26 toward the positioning boss 251; when the feeding return unit 20 is in the transfer station 18, the abutting convex shaft 271 drives the clamping boss 26 to switch to the released position through the restriction of the carrier block 111 constituting the feeding return station 17 and the feeding station 16; when the feeding return unit 20 is separated from the transfer station 18, the abutting convex shaft 271 loses the restriction and drives the clamping boss 26 to switch to the clamping position through the elastic member 28. The specific action is as follows: when the material return unit 20 is switched from the terminal processing station 19 to the transfer station 18, the abutting convex shafts 271 on both sides of the slider 27 are abutted and restricted by the carrier blocks 111 on both sides. As the material return unit 20 is switched into position, the slider 27 slides relative to the bearing head 25, that is, the clamping boss 26 moves away from the positioning boss 251, thereby realizing the loosening operation; thereafter, the switching unit 20 transfers the new terminal fixture 100 to the bearing head 25, the positioning boss 251 cooperates with the positioning groove 101 of the terminal fixture 100, and the clamping boss 26 is penetrated into the giving way groove 102; thereafter, the material return unit 20 is transferred from the transfer station 18 to the terminal processing station 19, and after leaving the transfer station 18, the abutting convex shaft 271 loses its restriction, and the slider 27 slides relative to the bearing head 25 under the action of the elastic member 28, that is, the clamping boss 26 approaches the positioning boss 251, thereby clamping the terminal fixture 100 thereon.

[0044] Furthermore, the platform blocks 111 on both sides are provided with guide grooves for the abutting convex shaft 271 to guide and penetrate, and when the abutting convex shaft 271 abuts against the end of the guide groove, it is abutted and limited, thereby ensuring that the bearing head 25 is accurately positioned.

[0045] The fixed structure adopted above is one of the more preferred solutions for realizing automatic clamping and loosening. Of course, it is not limited to this in other embodiments. For example, the structure for driving the clamping boss 26 to slide relative to each other may also be: the slider 27 has an abutment limit rod extending on the side of the support frame 11 facing the circulating fixture library 10. When the return material unit 20 switches from the terminal processing station 19 to the transfer station 18, the abutment limit rod is restricted by the support frame 11, so that the slider 27 slides relative to the supporting head 20; or the clamping boss 26 is fixed to the supporting head 25 in a hinged manner, and approaches or moves away from the positioning boss 251 by swinging, etc.

[0046] Specifically, in the present embodiment, the transmission rail includes a linear slide rail 21, a conveyor belt 23 and a drive motor 22. The conveyor belt 23 is arranged on the linear slide rail 21, that is, it is arranged parallel to the linear slide rail 21. The drive motor 22 drives and connects the conveyor belt 23 to drive the conveyor belt 23 to transmit. The supporting bracket 24 can be slidably assembled on the linear slide rail 21 and fixedly connected to the conveyor belt 23. In this way, the round-trip feeding of the return material unit 20 is realized.

[0047] Furthermore, the bearing bracket 24 specifically includes a connecting slider 241, a fixed frame 242 and a movable frame 243. The connecting slider 241 can be slidably mounted on the linear slide rail 21 and fixedly connected to the fixed frame 242. The movable frame 243 can be raised and lowered and mounted on the fixed frame 242. An elastic buffer is provided between the fixed frame 242 and the movable frame 243. The bearing head 25 is formed on the movable frame 243. Such a configuration enables the terminal clamp 100 thereon to have a buffer force in the vertical direction. This is beneficial to the subsequent terminal crimping operation and the correction in the sliding process described below. Of course, in other embodiments, the bearing bracket 24 can also be an integrated connection structure.

[0048] It also includes a correction unit 60, which is arranged on the transmission track of the feeding unit 20 and has a correction channel 61 for the terminal fixture 100 to pass through; as in this embodiment, the correction unit 60 is composed of two brackets arranged opposite to each other, and the middle area of ​​the two brackets is the correction channel 61. When the feeding unit 20 transfers the terminal fixture 100 back and forth, the position of the terminal fixture 100 is corrected through the correction channel 61, further ensuring accuracy. Of course, in other embodiments, the correction unit 60 may not be used.

[0049] Furthermore, in this embodiment, the terminal clamp 100 is a self-closing structure and needs to apply external force to open. Therefore, in this embodiment, it also includes a clamp opening unit 70, and the clamp opening unit 70 includes a lifting drive and a driving block connected to the lifting drive, and the driving block corresponds to the circulating transmission track 12 at the position of the terminal input port; the lifting drive drives the driving block to press down the terminal clamp 100 on the circulating transmission track 12 to open the terminal clamp 100, at this time, the external terminal 200 can be inserted into the terminal clamp 100 from the terminal input port 15; after completion, the lifting drive drives the driving block to rise, and the terminal clamp 100 loses external force and automatically closes. The clamp opening unit 70 adopts this method, which has a simple structure and is easy to implement. Of course, in other embodiments, the structure of the clamp opening unit 70 can be designed according to actual conditions. Alternatively, when the terminal clamp 100 is a structure that is closed by applying elastic force, the structure of the opening unit 70 may not be adopted; that is, when the terminal 200 is inserted, the terminal clamp 100 is forced to overcome the elastic force to open, and after insertion, the terminal 200 is clamped by the elastic force.

[0050] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A terminal circulation feeding mechanism, characterized in that: It includes a circulating fixture library, a return material unit, a switching unit, a first pushing unit and a second pushing unit; the circulating fixture library has a circulating transmission track and a terminal input port, a return material station and a feeding station corresponding to the circulating transmission track, the circulating transmission track is a closed and circulating transmission track, and a plurality of fixture slots are arranged on the circulating transmission track. The circulating transmission of the circulating transmission track drives the fixture slots on it to correspond to the terminal input port, the return material station or the feeding station; the first pushing unit corresponds to the feeding station to push the terminal fixture on the fixture slot to the feeding station, and the second pushing unit corresponds to the return material station to push the terminal fixture at the return material station into the fixture slot; A transfer station is also arranged between the return station and the feeding station, and the switching unit includes a switching driver and a switching carrier, and the switching driver drives and connects the switching carrier to drive the switching carrier to switch between the return station, the transfer station and the feeding station; the return material unit corresponds to the transfer station to switch between the transfer station and the terminal processing station.

2. The terminal circulating feeding mechanism according to claim 1, characterized in that: The switching carrier is provided with a first accommodating groove and a second accommodating groove for accommodating the terminal clamp, and the switching driver drives the switching carrier to switch between a first position and a second position, and when in the first position, the first accommodating groove and the second accommodating groove correspond to the feeding station and the transfer station respectively; when in the second position, the first accommodating groove and the second accommodating groove correspond to the transfer station and the return station respectively.

3. The terminal circulating feeding mechanism according to claim 1, characterized in that: The transfer station is an unsupported suspended station, and the material return unit directly carries the terminal fixture when it is in the transfer station.

4. The terminal circulating feeding mechanism according to claim 1 or 3, characterized in that: The return material unit is provided with a positioning boss, and the bottom of the terminal fixture is provided with a positioning groove. When the terminal fixture is transferred from the feeding station to the transfer station, the positioning groove at the bottom of the terminal fixture is matched with the positioning boss of the return material unit to achieve positioning assembly.

5. The terminal circulating feeding mechanism according to claim 4 is characterized in that: The matching structure of the positioning boss and the positioning groove is a matching structure that is wide at the top and narrow at the bottom, so that the terminal clamp can be restricted on the material feeding unit.

6. The terminal circulating feeding mechanism according to claim 4, characterized in that: The material return unit is also provided with a clamping boss, and the clamping boss can be movably switched between a clamping position close to the positioning boss and a loosening position away from the positioning boss; when the material return unit is in the transfer station, the clamping boss is restricted and is in the loosening position; the bottom of the terminal clamp is also provided with a clearance groove and a bayonet arranged on the side wall of the clearance groove; when the terminal clamp is transferred from the material feeding station to the transfer station, the clamping boss is inserted through the clearance groove at its bottom, and when the material return unit is separated from the transfer station, the clamping boss is switched to the clamping position and is clamped into the bayonet.

7. The terminal circulating feeding mechanism according to claim 6, characterized in that: The material returning unit comprises a transmission rail and a supporting bracket installed on the transmission rail, the supporting bracket having a supporting head, and the positioning boss is formed on the supporting head; a slidable slider is also arranged in the supporting head, the slider is provided with the clamping boss protruding from the upper surface of the supporting head and an abutting convex shaft protruding from the side surface of the supporting head, an elastic member is arranged between the slider and the supporting head, and the elastic member applies an elastic force to the slider in the direction of the positioning boss; when the material returning unit is in the transfer station, the abutting convex shaft drives the clamping boss to switch to the released position through the restriction of the carrier block constituting the material returning station and the material feeding station; when the material returning unit leaves the transfer station, the abutting convex shaft loses the restriction and drives the clamping boss to switch to the clamping position through the elastic member.

8. The terminal circulating feeding mechanism according to claim 1, characterized in that: The device also comprises a correction unit, which is arranged on the transmission track of the feeding and returning unit and has a correction channel for the terminal clamp to pass through.

9. The terminal circulating feeding mechanism according to claim 1, characterized in that: It also includes a clamp opening unit, which includes a lifting drive and a driving block connected to the lifting drive, and the driving block corresponds to a circular transmission track at the position of the terminal input port; the lifting drive drives the driving block to press down the terminal clamp on the circular transmission track to open the terminal clamp.

10. A terminal circulation feeding method, characterized in that: A terminal circulating feeding mechanism as described in any one of claims 1 to 9 is adopted; terminal clamps of different specifications are respectively placed in a plurality of clamp slots on a circulating transmission track, and the terminal clamps to be operated are transmitted to the position of the corresponding terminal input port through the circulating transmission track, and the terminal is inserted into the terminal clamp from the terminal input port by an external conveyor, and then the terminal clamp is transmitted to the position of the corresponding feeding station, and is pushed out to the feeding station by a first pushing unit, and then the switching unit transfers the terminal clamp of the feeding station to the transfer station, and transfers the previous terminal clamp of the transfer station to the return station; the terminal clamp transferred to the transfer station is output to the terminal processing station for processing by the return material unit, and then transmitted back to the transfer station by the return material unit after completion; the terminal clamp transferred to the return material station is pushed back to the clamp slot on the circulating transmission track by the second pushing unit, so as to realize the circulating feeding operation of the terminal.

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