Precise displacement feeding structure

Abstract

The precise displacement feeding structure comprises a feeding pipe, a swing long shaft and a clamping mechanism, and the feeding pipe is used for conveying materials; the swinging long shaft is driven by a driving mechanism to rotate, so that the swinging long shaft rotates back and forth within a certain angle range; the material clamping mechanism comprises a material clamping front plate and a material clamping back plate, the material clamping back plate is fixedly connected to the bottom end of the long swing shaft, the material clamping front plate is rotationally connected to the bottom end of the long swing shaft, and the material clamping mechanism further comprises a spring which is used for abutting against the face, away from the material clamping back plate, of the material clamping front plate. The material clamping front plate and the material clamping back plate are made to clamp materials conveyed by the feeding pipe. Through cooperation of the swing long shaft, the material clamping front plate, the material clamping back plate, the material supporting plate, a second limiting rod, a limiting stop block, a fixing rod and a spring, the material clamping mechanism can be opened and closed in a self-adaptive mode in the process of receiving discharging of a feeding pipe and placing materials into a material barrel, the materials can be conveniently transferred into the material barrel one by one, and the material clamping efficiency is improved. And the operation convenience is obviously improved.

Description

Technical Field

[0001] The invention relates to the technical field of workpiece feeding, in particular to a precision shift feeding structure. Background Art

[0002] In the production of precision hardware, pneumatic vibrating plates are used to arrange workpieces (such as brass, stainless steel, steel, and aluminum) in an orderly manner to assist in feeding them to automated assembly or processing machines. This allows the automated assembly equipment to assemble the individual parts of the product into a complete product, or to process the workpieces with automated processing machines. However, the process of transporting workpieces using pneumatic vibrating plates is uncontrollable. It cannot guarantee that workpieces are delivered to the automated assembly or processing machines one by one and in sequence, and multiple workpieces may be transported at once. Furthermore, to improve production efficiency, automated assembly or processing machines typically have multiple workstations, which are generally driven by a rotating mechanism. However, vibrating plates cannot connect to the rotating workstations of automated assembly or processing machines. Summary of the Invention

[0003] The purpose of the present invention is to improve and innovate the shortcomings and problems existing in the background technology and provide a precise shift feeding structure.

[0004] A precision shift feeding structure, comprising: A feeding pipe, used for conveying materials; A swinging long shaft, wherein the swinging long shaft is driven to rotate by a driving mechanism so as to reciprocate within a certain angular range; The material clamping mechanism includes a material clamping front plate and a material clamping back plate, the material clamping back plate is fixedly connected to the bottom end of the swinging long shaft, and the material clamping front plate is rotatably connected to the bottom end of the swinging long shaft. The material clamping mechanism also includes a spring, which is used to press against the side of the material clamping front plate away from the material clamping back plate, so that the material clamping front plate and the material clamping back plate clamp the material conveyed by the feeding pipe; A barrel fixing platform, on which a barrel is arranged; The limit block is used when the swinging long shaft drives the material clamped by the clamping mechanism to move to the top of the barrel, and the limit block abuts against the clamping back plate, and the upper surface of the clamping back plate always abuts against the next material extending out of the feed tube; The second limiting rod is used to abut against the clamping back plate when the swinging long shaft drives the clamping mechanism to move to the position directly below the feed pipe.

[0005] A further solution is to further include a supporting plate, wherein the inner bottom wall of the supporting plate is used to receive the materials conveyed by the feed pipe, and the second limiting rod is installed on the side wall of the supporting plate.

[0006] A further solution is that a first limiting rod is installed on the clamping front plate, and a round pad is installed on one end of the first limiting rod close to the clamping back plate, and the round pad is used to abut against a side of the clamping back plate close to the clamping front plate.

[0007] A further solution is that a limiting groove adapted to the material is provided on the material clamping back plate.

[0008] A further solution is to further include a pushing mechanism, which includes a second cylinder, a long pushing shaft is provided at the output end of the second cylinder, and a fine pushing needle is fixedly connected to the bottom end of the long pushing shaft; when the swinging long shaft drives the material clamped by the clamping mechanism to move to just above the barrel, the fine pushing needle is used to push the material into the barrel.

[0009] A further solution is that an upper piston and a lower piston are slidingly fitted in the second cylinder, a soft magnetic ring is arranged between the upper piston and the lower piston, the soft magnetic ring corresponds to the magnetic switch, and the side of the lower piston away from the soft magnetic ring is connected to the long axis of the ejector, the outer surface of the long axis of the ejector is slidingly fitted with the ejector rod limit sleeve and the first linear bearing, and the ejector rod limit sleeve and the first linear bearing are installed on the feeding spindle.

[0010] A further solution is that both the top wall and the bottom wall of the second cylinder cavity are provided with limited buffer rubber pads.

[0011] A further solution is that a second linear bearing and a third linear bearing are provided on the upper and lower ends of the outer surface of the swinging long shaft, and a deep groove ball bearing is also provided on the upper end of the swinging long shaft. The deep groove ball bearing, the second linear bearing and the third linear bearing are also installed on the feeding spindle.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) the present invention cooperates with the swinging long shaft, the clamping plate, the clamping back plate, the supporting plate, the second limiting rod, the limiting block, the fixing rod and the spring. When the clamping mechanism hits the limiting block, the clamping plate and the clamping back plate automatically separate from each other under the action of inertia; and when the clamping mechanism hits the second limiting rod, the clamping plate and the clamping back plate can also automatically separate from each other under the conduction of the impact force. Therefore, in the process of receiving the discharge of the feed pipe and placing the material into the barrel, the clamping mechanism can adaptively open and close, which facilitates the clamping mechanism to transfer the material into the barrel one by one, and significantly improves the convenience of operation. (2) The present invention facilitates the pushing of materials contaminated with metal cutting oil into the barrel by providing a pushing mechanism, thereby effectively solving the problem that materials contaminated with metal cutting oil cannot be automatically lowered by gravity alone. In addition, the outer surface of the long shaft of the material pusher in the pushing mechanism is in sliding cooperation with the limiting sleeve of the pushing rod and the first linear bearing. The limiting sleeve of the pushing rod and the first linear bearing play a guiding role, ensuring that the long shaft of the material pusher will not be eccentric during the upward and downward extension process. (3) The present invention has a compact overall structure and small size, and is suitable for processing precision hardware in various fields such as new energy, pen making, medical treatment and automobiles; (4) The precision shift loading structure provided by the present invention has the advantages of quick disassembly and replacement, easy adjustment, stable structure, high precision and low maintenance cost, etc. It can meet the needs of various raw materials with round, square, polygonal and other shapes; there is no restriction on the material of the raw materials, and brass, stainless steel, steel, aluminum and the like are all acceptable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of a three-dimensional structure of a precision shift feeding structure provided by an embodiment of the present invention Figure 1 ; Figure 2 A schematic diagram of a three-dimensional structure of a precision shift feeding structure provided by an embodiment of the present invention Figure 2 (excluding fixed platform and loading spindle); Figure 3 Schematic diagram of the structure of the clamping mechanism provided in the embodiment of the present invention Figure 1 ; Figure 4 Schematic diagram of the structure of the clamping mechanism provided in the embodiment of the present invention Figure 2 (excluding the sandwich plate); Figure 5 A schematic structural diagram of a support plate provided in an embodiment of the present invention; Figure 6 A schematic structural diagram of the swinging long shaft and the clamping mechanism provided in an embodiment of the present invention; Figure 7 A schematic structural diagram of a loading spindle and a clamping mechanism provided in an embodiment of the present invention; Figure 8 A schematic diagram of the three-dimensional structure of the ejecting mechanism provided in an embodiment of the present invention; Figure 9 A schematic cross-sectional view of the ejection mechanism provided in an embodiment of the present invention; Figure 10 This is a schematic cross-sectional structure diagram of the retaining frame and the loading spindle provided in an embodiment of the present invention.

[0014] Reference numerals: 1, fixed platform; 2, barrel fixing platform; 3, barrel; 4, retaining frame; 5, transverse connecting piece; 6, first cylinder; 7, second cylinder; 8, loading spindle; 9, fine-tuning rod; 10, feeding pipe; 11, supporting plate; 12, clamping mechanism; 121, clamping front plate; 122, clamping back plate; 123, fixing rod; 124, spring; 125, locking nut; 126, first limiting rod; 127, round washer; 128, second limiting rod; 129. Limiting groove; 13. Limiting block; 14. Swinging long axis; 15. Limiting sleeve of ejector rod; 16. Ejecting long axis; 17. Ejecting fine needle; 18. Cylinder cover plate; 19. Limiting buffer rubber pad; 20. Upper piston; 21. Lower piston; 22. Soft magnetic ring; 23. First linear bearing; 24. Second linear bearing; 25. Deep groove ball bearing; 26. Inner sleeve; 27. Third linear bearing; 28. Material; 29. ​​Spur push-pull rod; 30. Swinging spur teeth. DETAILED DESCRIPTION

[0015] In order to make the objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0017] See also Figure 1-Figure 2 The present invention provides a precision shift loading structure, comprising a fixed platform 1 and a barrel fixing platform 2, on which a plurality of barrels 3 are mounted; wherein, only one barrel 3 is shown in the figure, and the barrel fixing platform 2 can rotate relative to the fixed platform 1 so that the barrels 3 can be rotated to the bottom of the fixed platform 1 in sequence; wherein, the mechanism for driving the barrel fixing platform 2 to rotate is not shown in the figure; specifically, the barrel fixing platform 2 can be mounted on a slewing bearing, and the motor drives the gear to rotate, and the gear is meshed with the gear teeth on the outer surface of the slewing bearing, thereby driving the slewing bearing to rotate. A fine-tuning rod 9 is mounted on the upper surface of the fixed platform 1, and a retaining frame 4 is mounted on the upper end of the fine-tuning rod 9; a loading spindle 8 is mounted on the retaining frame 4, and the bottom end of the loading spindle 8 passes through the fixed platform 1 and extends to the top of the barrel 3.

[0018] See also Figure 1 and Figure 7A feed pipe 10 is also installed on the retaining frame 4. The upper end of the feed pipe 10 is connected to the pneumatic vibration plate. The pneumatic vibration plate is used to transport the material 28 into the feed pipe 10 in an orderly manner. The material 28 can be any one of brass, stainless steel, steel and aluminum. The bottom end of the feed pipe 10 extends to the bottom end of the loading spindle 8.

[0019] Further, see Figure 1-Figure 5 A first cylinder 6 is mounted on one side of the retainer 4 via a transverse connector 5. The output end of the first cylinder 6 is fixedly connected to a spur push-pull rod 29, which drives the spur push-pull rod 29 in reciprocating motion. The spur push-pull rod 29 is meshed with a swinging spur tooth 30, which is mounted on the upper end of the swinging shaft 14. When the output end of the first cylinder 6 extends or contracts, it drives the swinging spur tooth 30 to rotate back and forth within a certain angular range, thereby driving the swinging shaft 14 to rotate back and forth within a certain angular range. The bottom end of the swing shaft 14 is provided with a clamping mechanism 12; specifically, the clamping mechanism 12 includes a clamping front plate 121 and a clamping back plate 122, the clamping back plate 122 is fixedly connected to the bottom end of the swing shaft 14, the clamping front plate 121 is rotatably connected to the bottom end of the swing shaft 14 by setting a sleeve, and the clamping mechanism 12 also includes a fixing rod 123, the fixing rod 123 is installed on the clamping back plate 122, and the fixing rod 123 passes through the clamping front plate 121 and extends to the clamping front plate On the side of 121 away from the clamping back plate 122, a spring 124 and two gaskets are sleeved on the fixing rod 123, and the two ends of the spring 124 are in contact with the gaskets. A locking nut 125 is also threadedly connected to the fixing rod 123. The spring 124 is in a slightly compressed state, so that the gaskets at both ends of the spring 124 are in contact with the clamping front plate 121 and the locking nut 125 respectively, so that the clamping back plate 122 and the clamping front plate 121 can clamp the material 28 delivered by the feeding pipe 10.

[0020] Preferably, see Figure 6 The upper and lower ends of the outer surface of the swinging long shaft 14 are sleeved with a second linear bearing 24 and a third linear bearing 27. The outer surface of the upper end of the swinging long shaft 14 is also rotatably connected to the deep groove ball bearing 25 through an inner sleeve 26. The deep groove ball bearing 25, the second linear bearing 24 and the third linear bearing 27 are installed on the feeding spindle 8.

[0021] Please continue reading Figure 1-Figure 5, a supporting plate 11 and a limit block 13 are provided at the bottom end of the loading spindle 8; specifically, the supporting plate 11 is directly installed on the bottom end of the loading spindle 8, a second limit rod 128 is installed on the side wall of the supporting plate 11, and the limit block 13 is installed on the bottom end of the loading spindle 8 through a fixed block. When the first cylinder 6 is extended, the first cylinder 6 drives the swinging long shaft 14 to rotate toward the limit block 13, so that the material clamping positive plate 121 and the material clamping back plate 122 rotate toward the limit block 13 together, until the edge of the material clamping back plate 122 exceeds the part of the material clamping positive plate 121 and collides with the limit block 13. At this time, the material 28 clamped by the material clamping mechanism 12 is just above the barrel 3; under the action of inertia, the material clamping positive plate 121 rotates relative to the swinging long shaft 14 and compresses the spring 124, so that the material clamping positive plate 121 and the material clamping back plate 122 separate from each other; the material clamping positive plate 121 and the material clamping back plate 122 no longer clamp the material 28; at this time, the material 28 can automatically fall down into the barrel 3. When the first cylinder 6 contracts, the first cylinder 6 drives the swinging long shaft 14 to rotate toward the second limiting rod 128, so that the clamping positive plate 121 and the clamping back plate 122 rotate toward the second limiting rod 128 together, until the back of the clamping back plate 122 collides with the second limiting rod 128, and the impact force is transmitted to the clamping positive plate 121, so that the clamping positive plate 121 also compresses the spring 124, thereby separating the clamping positive plate 121 and the clamping back plate 122, so that the bottom end of the next material 28 falls from the upper surface of the clamping back plate 122 to between the clamping positive plate 121 and the clamping back plate 122, and then the spring 124 immediately resets to clamp the fallen material 28, so that the clamping mechanism 12 transfers the material 28 to the barrel 3 one by one; at the same time, the barrel fixing table 2 can also rotate relative to the fixed platform 1, so that each barrel 3 can receive the material in turn.

[0022] It should be noted that while the clamping mechanism 12 is transferring the material 28 to the top of the barrel 3, the bottom end of the next material 28 extends out of the feed tube 10 and falls on the upper surface of the clamping back plate 122, preventing it from falling, making it easier for the clamping mechanism 12 to clamp it after it rotates back.

[0023] Preferably, if Figure 4 As shown, a first limiting rod 126 is mounted on the clamping plate 121. A circular washer 127 is mounted on the end of the first limiting rod 126 that is closest to the clamping back plate 122. The circular washer 127 is used to abut against the side of the clamping back plate 122 that is closest to the clamping plate 121. When the clamping mechanism 12 is clamping the workpiece 28, the abutment of the circular washer 127 against the clamping back plate 122 prevents the clamping plate 121 from getting too close to the clamping back plate 122 and damaging the brass or other workpiece 28.

[0024] Optionally, a limiting groove 129 adapted to the material 28 is provided on the material clamping back plate 122. The limiting groove 129 is used to accommodate the fallen material 28 and guide it.

[0025] It should be noted that during the production process, the material 28 is usually contaminated with metal cutting oil, which makes it difficult for the material 28 to automatically fall down by gravity alone after the material clamping front plate 121 and the material clamping back plate 122 are separated. Figures 8-10 As shown, the ejection mechanism includes a second cylinder 7, which is mounted on the retaining frame 4, and a ejection long shaft 16 is provided at the output end of the second cylinder 7, and a ejection fine needle 17 adapted to the material 28 is fixedly connected to the bottom end of the ejection long shaft 16; when the swinging long shaft 14 drives the material 28 clamped by the clamping mechanism 12 to move to the top of the barrel 3; as described above, under the action of inertia, the clamping positive plate 121 rotates relative to the swinging long shaft 14, causing the clamping positive plate 121 and the clamping back plate 122 to separate from each other, and at this time the second cylinder 7 drives the ejection fine needle 17 to act on the top of the material 28, thereby pushing the material 28 into the barrel 3.

[0026] Optionally, the top wall of the second cylinder 7 is detachably connected to a cylinder cover plate 18, and an upper piston 20 and a lower piston 21 are slidably fitted in the second cylinder 7. A soft magnetic ring 22 is provided between the upper piston 20 and the lower piston 21. The soft magnetic ring 22 corresponds to a magnetic switch, which is not shown in the figure. Through the mutual cooperation between the soft magnetic ring 22 and the magnetic switch, the movement position of the upper piston 20 and the lower piston 21 can be sensed, thereby facilitating the control of the upward and downward telescopic displacement of the ejector shaft 16. The side of the lower piston 21 away from the soft magnetic ring 22 is connected to the ejector shaft 16, and the outer surface of the ejector shaft 16 is slidably fitted with the ejector rod limit sleeve 15 and the first linear bearing 23, which are mounted on the feeding spindle 8. The ejector rod limit sleeve 15 and the first linear bearing 23 play a guiding role, ensuring that the ejector shaft 16 is not eccentric when it is extended and retracted up and down.

[0027] Preferably, both the top wall and the bottom wall of the inner cavity of the second cylinder 7 are provided with limit buffer rubber pads 19 , which serve to limit the upper and lower positions of the upper piston 20 and the lower piston 21 .

[0028] The working principle of the present invention is as follows: when in use, the material 28 is transported to the feeding pipe 10 by the pneumatic vibrating plate, and the material 28 falls onto the supporting plate 11 under the guidance of the feeding pipe 10 and is clamped by the clamping mechanism 12. At this time, the first material 28 falls out completely, and the bottom end of the next material 28 extends out of the feeding pipe 10; then the first cylinder 6 extends, driving the clamping mechanism 12 to rotate toward the limit stopper 13 until the edge of the clamping back plate 122 collides with the limit stopper 13, at this time, the material 28 clamped by the clamping mechanism 12 is just above the barrel 3; under the action of inertia, the clamping positive plate 121 rotates relative to the swing long axis 14 and compresses the spring 124, so that the clamping positive plate 121 and the clamping back plate 122 separate from each other; the clamping positive plate 121 and the clamping back plate 122 no longer clamp the material 28; at the same time, the second cylinder 7 drives the material clamping mechanism 12 to rotate toward the limit stopper 13 The dynamic ejector needle 17 acts on the top of the material piece 28, thereby pushing the material piece 28 into the barrel 3; then the first cylinder 6 contracts, driving the clamping mechanism 12 to rotate in the opposite direction until the back of the clamping back plate 122 collides with the second limit rod 128, and the impact force is transmitted to the clamping positive plate 121, so that the clamping positive plate 121 also compresses the spring 124, thereby separating the clamping positive plate 121 and the clamping back plate 122, so that the bottom end of the next material piece 28 falls from the upper surface of the clamping back plate 122 to between the clamping positive plate 121 and the clamping back plate 122, and then the spring 124 immediately resets to clamp the fallen material piece 28, thereby realizing the adaptive opening and closing of the clamping mechanism 12, making it convenient for the clamping mechanism 12 to transfer the material pieces 28 to the barrel 3 one by one; at the same time, the barrel fixing table 2 can also rotate relative to the fixed platform 1, so as to facilitate each barrel 3 to receive materials in turn.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation to the invention.

[0030] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0031] Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. Mentioning "embodiments" in this article means that the specific features, structures or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present embodiment application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It can be understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application. Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purpose of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A precision shift feeding structure, characterized in that: include: A feed pipe (10), the feed pipe (10) being used to convey the material (28); A swinging long shaft (14), wherein the swinging long shaft (14) is driven to rotate by a driving mechanism so that the swinging long shaft (14) reciprocates within a certain angle range; A material clamping mechanism (12), the material clamping mechanism (12) comprising a material clamping front plate (121) and a material clamping back plate (122), the material clamping back plate (122) being fixedly connected to the bottom end of the swinging long shaft (14), the material clamping front plate (121) being rotatably connected to the bottom end of the swinging long shaft (14), the material clamping mechanism (12) further comprising a spring (124), the spring (124) being used to press against a side of the material clamping front plate (121) away from the material clamping back plate (122), so that the material clamping front plate (121) and the material clamping back plate (122) clamp the material (28) conveyed by the feeding pipe (10); A barrel fixing platform (2), wherein a barrel (3) is provided on the barrel fixing platform (2); The limit block (13) is configured such that when the swinging long shaft (14) drives the material (28) held by the clamping mechanism (12) to move to the position directly above the barrel (3), the limit block (13) abuts against the clamping back plate (122), and the upper surface of the clamping back plate (122) always abuts against the next material (28) extending out of the feed tube (10); The second limiting rod (128) is configured to abut against the clamping back plate (122) when the swinging long shaft (14) drives the clamping mechanism (12) to move to the position directly below the feed tube (10).

2. A precision shift feeding structure according to claim 1, characterized in that: It also includes a supporting plate (11), the inner bottom wall of the supporting plate (11) is used to receive the material (28) delivered by the feeding pipe (10), and the second limiting rod (128) is installed on the side wall of the supporting plate (11).

3. The precise shift feeding structure according to claim 1, characterized in that: A first limiting rod (126) is installed on the clamping front plate (121), and a round pad (127) is installed on one end of the first limiting rod (126) close to the clamping back plate (122). The round pad (127) is used to abut against a side of the clamping back plate (122) close to the clamping front plate (121).

4. The precise shift feeding structure according to claim 1, characterized in that: The material clamping back plate (122) is provided with a limiting groove (129) adapted to the material piece (28).

5. The precise shift feeding structure according to claim 1, characterized in that: The device further comprises a material ejection mechanism, wherein the material ejection mechanism comprises a second cylinder (7), an output end of the second cylinder (7) is provided with a material ejection long shaft (16), and a material ejection fine needle (17) is fixedly connected to the bottom end of the material ejection long shaft (16); when the swinging long shaft (14) drives the material piece (28) clamped by the clamping mechanism (12) to move to the top of the barrel (3), the material ejection fine needle (17) is used to eject the material piece (28) into the barrel (3).

6. The precise shift feeding structure according to claim 5, characterized in that: An upper piston (20) and a lower piston (21) are slidably engaged in the second cylinder (7), a soft magnetic ring (22) is provided between the upper piston (20) and the lower piston (21), the soft magnetic ring (22) corresponds to the magnetic switch, a side of the lower piston (21) away from the soft magnetic ring (22) is connected to the ejector shaft (16), an outer surface of the ejector shaft (16) is slidably engaged with the ejector rod limiting sleeve (15) and the first linear bearing (23), and the ejector rod limiting sleeve (15) and the first linear bearing (23) are mounted on the feeding spindle (8).

7. The precise shift feeding structure according to claim 6, characterized in that: The top wall and bottom wall of the inner cavity of the second cylinder (7) are both provided with a limiting buffer rubber pad (19).

8. The precise shift feeding structure according to claim 6, characterized in that: The upper and lower ends of the outer surface of the swinging long shaft (14) are sleeved with a second linear bearing (24) and a third linear bearing (27), and the upper end of the swinging long shaft (14) is also sleeved with a deep groove ball bearing (25). The deep groove ball bearing (25), the second linear bearing (24) and the third linear bearing (27) are also installed on the feeding spindle (8).

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