Feeding mechanism for annular workpieces

Abstract

The utility model relates to a feeding mechanism for annular workpieces. The feeding mechanism comprises a feeding module and a feeding module. The feeding module comprises a strip-shaped mounting seat for placing a plurality of workpieces in sequence and a material pushing assembly for pushing the workpieces to move towards the material waiting position; the feeding module comprises a fixing block for placing a single workpiece, a second clamping assembly for fixing the single workpiece on the fixing block, a first driving assembly and a rotating assembly; a profiling groove matched with the outer contour of a workpiece is formed in the surface of one side of the fixing block. The material pushing assembly pushes the workpiece into the profiling groove along the strip-shaped mounting base; the feeding mechanism for the annular workpieces is ingenious in structural design, automatic feeding and feeding of the workpieces are achieved, manual intervention is reduced, the production automation degree is improved, repeated manual labor is replaced with the feeding mode, the labor intensity of operators can be remarkably reduced, errors caused by factors such as human fatigue and inattention are reduced, and the production efficiency is improved. And the reliability of the production process is improved.

Description

Technical Field

[0001] This utility model relates to the field of electronic product processing technology, and more specifically, to a feeding mechanism for a ring-shaped workpiece. Background Technology

[0002] In the manufacturing process of electronic products, ring-shaped workpieces, such as small workpieces like volume buttons and power buttons, generally need to be placed in contour slots on a fixture to ensure accurate positioning during processing and reduce machining errors. However, the current feeding method usually involves operators manually placing the ring-shaped workpiece directly into the pre-made contour slots on the fixture, and then moving the fixture to the next station. This manual placement is slow, unsuitable for mass production, and the repetitive operation over a long period increases the labor intensity of operators, potentially leading to fatigue and related occupational diseases. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a feeding mechanism for annular workpieces, addressing the aforementioned deficiencies of the prior art.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a feeding mechanism for a ring-shaped workpiece, comprising at least one feeding module and a feeding module; the feeding module includes a strip-shaped mounting base for placing multiple workpieces sequentially; the front end of the strip-shaped mounting base is provided with a waiting position and a first clamping component for fixing and limiting at least one workpiece on the waiting position; the feeding module further includes a pushing component for pushing multiple workpieces toward the waiting position; the feeding module includes a feeding head; the feeding head includes a fixing block for placing a single workpiece, a second clamping component for fixing the single workpiece on the fixing block, a first driving component for moving the fixing block and the second clamping component closer to or away from the waiting position, and a rotating component for driving the first driving component to rotate longitudinally; one side surface of the fixing block is provided with a contour groove adapted to the outer contour of the workpiece; the pushing component pushes the workpiece along the strip-shaped mounting base into the contour groove.

[0005] The feeding mechanism of this utility model includes a strip-shaped X-axis base and an assembly strip for multiple workpieces to be movably fitted; the upper surface of the X-axis base is provided with an X-axis guide rail along its length; the X-axis base is also provided with an adsorption assembly for fixing and adsorbing the assembly strip onto the X-axis guide rail.

[0006] The feeding mechanism of this utility model includes a positioning groove on the upper surface of the X-guide rail; the assembly strip is positioned and installed in the positioning groove by a positioning component.

[0007] The feeding mechanism of this utility model includes a plurality of adsorption holes on the X-guide rail; a vacuum adsorption chamber in the X-direction substrate; a positioning groove connected to the vacuum adsorption chamber through the adsorption holes; and an adsorption assembly including a plurality of adsorption holes, the vacuum adsorption chamber, a vacuum pump for controlling the air pressure in the vacuum adsorption chamber, and a suction pipe connecting the vacuum pump and the vacuum adsorption chamber.

[0008] The feeding mechanism of this utility model includes two sets of strip-shaped mounting seats; the pushing assembly includes two X-axis slide rails respectively disposed on the outer surface of the strip-shaped mounting seat, two sliders respectively slidably connected to the X-axis slide rails, and a second driving assembly for driving any one of the sliders to move along the X-axis; the upper end of the slider is provided with a pushing block slidably connected to the corresponding X-axis guide rail above the X-axis base; the side surface of the pushing block facing the workpiece is provided with a pushing part for pushing the workpiece;

[0009] The feeding mechanism of this utility model includes a locking block fixedly installed below each of the two sliders; the locking block has an insertion slot in the middle; the second driving component includes a locking block that is inserted into any of the insertion slots, a Y-axis driving cylinder that drives the locking block to move between the two locking blocks, and an X-axis linear motor that drives the locking block and the Y-axis driving cylinder to move along the X-axis.

[0010] The feeding mechanism of this utility model further includes a pressure sensor for detecting the pressure of the latching block and a compression spring for providing elastic force to the latching block.

[0011] The feeding mechanism of this utility model includes multiple sets of feeding modules arranged side by side; each feeding module further includes a support column and a third drive component that drives the support column to move among the multiple sets of feeding modules; the feeding head is fixedly installed on the upper end of the support column.

[0012] The feeding mechanism of this utility model includes a first clamping assembly comprising a first clamping plate, a second clamping plate, and a first clamping cylinder for driving the first and second clamping plates to move laterally closer or further away; the front end of the strip-shaped mounting base extends between the first and second clamping plates; the first and second clamping plates are provided with outwardly protruding limiting portions on opposite sides; when the first and second clamping plates are clamped in place, the two limiting portions cooperate to prevent the workpiece from sliding outward from the waiting position at the front end of the strip-shaped mounting base;

[0013] The feeding mechanism of this utility model includes a second clamping assembly comprising a first clamping jaw, a second clamping jaw, and a second clamping cylinder for driving the first and second clamping jaws to move longitudinally closer or further away; a fixing block is located between the first and second clamping jaws; the fixing block has a first clearance groove for the first clamping jaw to extend into the contour groove and a second clearance groove for the second clamping jaw to extend into the contour groove on both sides of the contour groove; the clamping end of the first clamping jaw has a first groove adapted to the outer contour of the middle part of the workpiece, and a pushing part for pushing a single workpiece into the contour groove and restricting the workpiece from detaching from the contour groove; the clamping end of the second clamping jaw has a second groove for insertion into the end of the workpiece.

[0014] The beneficial effects of this utility model are as follows: the feeding mechanism for the annular workpiece is ingeniously designed and easy to use. Multiple workpieces are simply placed on the strip-shaped mounting base, and then the pushing assembly moves the multiple workpieces on the strip mounting base towards the desired position. Once the workpiece reaches the desired position, the first clamping assembly fixes at least one workpiece at the front end of the strip mounting base at that position. At this time, the first driving assembly drives the fixing block and the second clamping assembly closer to the desired position, and the first clamping assembly releases the workpiece from its position. The pushing assembly then continues to move the workpiece forward until the strip mounting base... The first workpiece at the front end of the mounting block is placed into the contour groove of the fixing block, and then the workpiece is fixed in the contour groove by the second clamping component. The first driving component drives the fixing block and the second clamping component away from the waiting position. The workpiece is rotated 90° by the rotating component, thus completing the workpiece loading action. This realizes automatic feeding and loading of workpieces, reduces manual intervention, improves the degree of production automation, and this loading method replaces repetitive manual labor, which can significantly reduce the labor intensity of operators, reduce errors caused by human fatigue, lack of concentration and other factors, and improve the reliability of the production process. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a ring-shaped workpiece feeding mechanism according to a preferred embodiment of the present invention. Figure 1 ;

[0017] Figure 2 This is a schematic diagram of the structure of a ring-shaped workpiece feeding mechanism according to a preferred embodiment of the present invention. Figure 2 ;

[0018] Figure 3 yes Figure 1 Schematic diagram of the structure of workpiece 01;

[0019] Figure 4 yes Figure 1 Schematic diagram of the structure of the middle strip mounting base 11;

[0020] Figure 5 yes Figure 1 Schematic diagram of the structure of the loading module 20;

[0021] Figure 6 yes Figure 5 Enlarged view at point D

[0022] Figure 7 yes Figure 4 Schematic diagram of the middle slider 132;

[0023] Figure 8 yes Figure 2 A schematic diagram of the structure of the second drive component. Detailed Implementation

[0024] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] "Multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0027] Furthermore, the terms indicating orientation, such as "up, down, front, back, left, right, upper end, lower end, longitudinal," etc., are all based on the posture and position of the device or equipment described in this solution during normal use.

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0029] A preferred embodiment of the present invention provides a feeding mechanism for a ring-shaped workpiece, such as... Figure 1-2 As shown, it includes at least one feeding module 10 and a loading module 20; the feeding module 10 includes a strip mounting base 11 for sequentially placing multiple workpieces 01; as Figure 3 As shown, the annular workpiece in this embodiment is a semi-closed annular workpiece. In this embodiment, the workpiece has an inverted U-shaped structure. Alternatively, the workpiece can also be a C-shaped structure or other semi-closed annular structures. Figure 4 As shown, the front end of the strip mounting base 11 is provided with a waiting position 02 and a first clamping component 12 that fixes and limits at least one workpiece 01 on the waiting position 02; the feeding module 10 also includes a pushing component 13 that pushes multiple workpieces 01 to move simultaneously toward the waiting position 02; this speeds up the feeding speed, improves production efficiency, and is suitable for mass production; as shown Figure 5-6 As shown, the feeding module 20 includes a feeding head; the feeding head includes a fixing block 21 for placing a single workpiece 01, a second clamping assembly 22 for fixing the single workpiece 01 on the fixing block 21, a first driving assembly 23 for moving the fixing block 21 and the second clamping assembly 22 closer to or further away from the material waiting position 02, and a rotating assembly 24 for driving the first driving assembly 23 to rotate longitudinally; it is worth noting that the first driving assembly 23 can be implemented using a telescopic cylinder, a lead screw module, or a linear motor in the prior art, and the rotating assembly 24 can be implemented using a turntable and a rotating motor for driving the turntable to rotate in the prior art. The first driving assembly is fixedly installed on the turntable. One side surface of the fixing block 21 is provided with a contour groove 211 that matches the outer contour of the workpiece 01; this can improve the positioning accuracy of the workpiece and reduce installation errors; the pushing assembly 13 pushes the workpiece 01 into the contour groove 211 along the strip mounting seat 11. Through the cooperation of the feeding module and the loading module, automatic feeding and loading of workpieces are realized, reducing manual intervention and improving the degree of production automation. The workpiece is securely fixed to the fixing block 21 by the second clamping assembly 22, ensuring the stability of the workpiece during handling and processing.

[0030] The feeding mechanism for this ring-shaped workpiece is ingeniously designed and easy to use. Multiple workpieces are simply placed on the strip-shaped mounting base. Then, a pushing assembly moves the workpieces from the mounting base towards the desired position. Once the workpiece reaches the desired position, a first clamping assembly fixes at least one workpiece at the front end of the strip-shaped mounting base in place. At this point, a first driving assembly moves a fixing block and a second clamping assembly closer to the desired position. The contour groove on the fixing block aligns with the workpiece, and the first clamping assembly releases its constraint. The pushing assembly then continues to move the workpiece forward until the strip-shaped mounting base reaches the desired position. The first workpiece at the front end of the mounting base is placed into the contour groove of the fixing block, and then the workpiece is fixed in the contour groove by the second clamping component. The first driving component drives the fixing block and the second clamping component away from the waiting position. The workpiece is rotated 90° by the rotating component, thus completing the workpiece loading action. Automatic feeding and loading of workpieces is realized, reducing manual intervention and improving the degree of production automation. Moreover, this loading method replaces repetitive manual labor, which can significantly reduce the labor intensity of operators, reduce errors caused by human fatigue, lack of concentration and other factors, and improve the reliability of the production process.

[0031] In one embodiment, the strip mounting base 11 includes a strip-shaped X-axis base 111 and an assembly strip 112 for multiple workpieces 01 to be movably fitted. The upper surface of the X-axis base 111 is provided with an X-axis guide rail 113 along its length. The X-axis guide rail 113 provides stable guidance for the assembly strip 112, ensuring that the workpieces move in a straight line during feeding without deviation, thus improving the accuracy of feeding. The X-axis base 111 is also provided with an adsorption assembly for fixing and adsorbing the assembly strip 112 onto the X-axis guide rail 113. Installation is convenient.

[0032] Furthermore, the upper surface of the X-guide rail 113 is provided with a positioning groove 114; the assembly strip 112 is positioned and installed in the positioning groove 114 by a positioning component. The positioning component can prevent the assembly strip from shifting on the X-guide rail, ensuring that the workpiece on the assembly strip can be accurately moved along the X-guide rail into the contour groove on the fixed block. In one embodiment, one of the X-guide rail 113 and the assembly strip 112 is provided with multiple outwardly protruding positioning posts 115, and the other is provided with multiple positioning holes 116 that mate with the positioning posts 115 one by one; the multiple positioning posts and multiple positioning holes 116 constitute a positioning component. Optionally, both the X-guide rail 113 and the assembly strip 112 are provided with corresponding positioning holes, and the positioning component can use positioning pins that mate with the corresponding two positioning holes; the structure is simple, the positioning is accurate, and it can prevent the assembly strip 112 from shifting on the X-guide rail.

[0033] Furthermore, the X-guide rail 113 is provided with multiple adsorption holes 117; the X-axis substrate 111 is provided with a vacuum adsorption chamber (not shown in the figure); the positioning groove 114 is connected to the vacuum adsorption chamber (not shown in the figure) through the adsorption holes 117; the adsorption assembly includes multiple adsorption holes 117, a vacuum adsorption chamber (not shown in the figure), a vacuum pump (not shown in the figure) for controlling the air pressure in the vacuum adsorption chamber, and a suction pipe 118 connecting the vacuum pump (not shown in the figure) and the vacuum adsorption chamber (not shown in the figure). When the vacuum pump is started, it will draw air from the vacuum adsorption chamber, making it form a vacuum state lower than atmospheric pressure. At this time, the air pressure in the vacuum adsorption chamber is lower than the external atmospheric pressure, and the external atmospheric pressure will press the assembly strip 112 against the adsorption holes 117 on the X-guide rail 113; and the adsorption holes 117 and the assembly strip 112 have a certain degree of sealing, which can ensure that the vacuum state is maintained, thereby achieving the purpose of firmly adsorbing the assembly strip 112 onto the X-guide rail 113.

[0034] By controlling the operation of the vacuum pump, the air pressure inside the vacuum adsorption chamber can be adjusted, thereby controlling the magnitude of the adsorption force. When it is necessary to release the assembly strip, simply stop the vacuum pump, allow air to re-enter the vacuum adsorption chamber, and the adsorption force will disappear, allowing the assembly strip to be easily removed.

[0035] Alternatively, in another embodiment, the adsorption assembly can employ multiple magnets with adsorption properties, as is common in the art. The magnets are mounted on the X-guide rail, and the mounting strips can be made of magnetic metal, making assembly and disassembly simple.

[0036] In one embodiment, to further improve the workpiece feeding efficiency, the strip mounting base 11 is provided with two sets; the pushing assembly 13 includes two X-axis slide rails 131 respectively disposed on the outer surface of the strip mounting base 11, two sliders 132 respectively slidably connected to the X-axis slide rails 131, and a second driving assembly for driving any slider 132 to move along the X-axis; the upper end of the slider 132 is provided above the X-axis base 111 and is provided with a pushing block 133 slidably connected to the corresponding X-axis guide rail 113; the side surface of the pushing block 133 facing the workpiece 01 is provided with a pushing part 1331 for pushing the workpiece 01. The pushing part 1331 has an outwardly protruding block-shaped structure, and its middle part is provided with a channel that is slidably connected to the X-axis guide rail.

[0037] Furthermore, such as Figure 7 As shown, a locking block 134 is fixedly installed below each of the two sliders 132; the locking block 134 has a insertion slot (not shown in the figure) in the middle; as Figure 8As shown, the second drive assembly includes a snap-fit ​​block 135 that engages with any of the snap-fit ​​slots, a Y-axis drive cylinder 136 that moves the snap-fit ​​block 135 between two snap-fit ​​blocks 134, and an X-axis linear motor 137 that moves the snap-fit ​​block 135 and the Y-axis drive cylinder 136 along the X-axis. After the snap-fit ​​block 135 is engaged with the snap-fit ​​slot on a snap-fit ​​block, the X-axis linear motor can drive the currently connected snap-fit ​​block to move, thereby achieving the purpose of moving the slider.

[0038] Alternatively, the second drive assembly may also include a pressure sensor 138 for detecting the pressure of the latching block 135, and a compression spring 139 for providing elastic force to the latching block 135; by monitoring the pressure, the pushing of the workpiece is controlled.

[0039] In one embodiment, such as Figure 1 As shown, multiple sets of feeding modules 10 are arranged side by side; Figure 5 As shown, the feeding module 20 also includes a support column 25 and a third drive component 26 that drives the support column 25 to move among multiple feeding modules 10; the feeding is flexible; the feeding head is fixedly installed on the upper end of the support column 25; the feeding head is located on one side of the waiting position; in this embodiment, the third drive component 26 can be a linear drive motor in the prior art, which will not be described in detail here.

[0040] like Figure 4 As shown, the first clamping assembly 12 includes a first clamping plate 121, a second clamping plate 122, and a first clamping cylinder 123 that drives the first clamping plate 121 and the second clamping plate 122 to move laterally closer or further away; the front end of the strip mounting base 11 extends between the first clamping plate 121 and the second clamping plate 122; the opposite sides of the first clamping plate 121 and the second clamping plate 122 are provided with outwardly protruding limiting parts 1211; when the first clamping plate 121 and the second clamping plate 122 are clamped in place, the two limiting parts 1211 cooperate with each other to prevent the workpiece 01 from sliding outward from the waiting position 02 at the front end of the strip mounting base 11.

[0041] like Figure 6As shown, the second clamping assembly 22 includes a first clamping jaw 221, a second clamping jaw 222, and a second clamping cylinder 223 that drives the first clamping jaw 221 and the second clamping jaw 222 to move longitudinally closer or further away; a fixing block 21 is located between the first clamping jaw 221 and the second clamping jaw 222; the fixing block 21 has a first clearance groove 212 for the first clamping jaw 221 to extend into the contour groove 211 and a second clearance groove 213 for the second clamping jaw 222 to extend into the contour groove 211 on both sides; this facilitates clamping and fixing the workpiece in the contour groove and is convenient to use. The first gripper 221 has a first groove 2211 at its gripping end that matches the outer contour of the middle part of the workpiece 01, and a pushing part 2212 that pushes a single workpiece 01 into the contour groove 211 and restricts the workpiece 01 from detaching from the contour groove 211. This not only allows the first workpiece to be pushed out, but also restricts the workpiece 01 from detaching from the contour groove 211. The second gripper 222 has a second groove 2221 at its gripping end that is inserted into the end of the workpiece 01. By providing the first groove and the second groove at the gripping ends of the first gripper 221 and the second gripper 222 respectively that match the outer contour of the middle part and the end of the workpiece 01, it is ensured that the workpiece is accurately and firmly gripped, reducing positional errors.

[0042] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A feeding mechanism for a ring-shaped workpiece, characterized in that, The system includes at least one feeding module and one loading module. The feeding module includes a strip-shaped mounting base for sequentially placing multiple workpieces. The front end of the strip-shaped mounting base is provided with a waiting position and a first clamping component that fixes and limits at least one workpiece on the waiting position. The feeding module also includes a pushing component that pushes multiple workpieces toward the waiting position. The loading module includes a loading head. The loading head includes a fixing block for placing a single workpiece, a second clamping component that fixes the single workpiece on the fixing block, a first driving component that moves the fixing block and the second clamping component closer to or away from the waiting position, and a rotating component that drives the first driving component to rotate longitudinally. One side surface of the fixing block is provided with a contour groove that matches the outer contour of the workpiece. The pushing component pushes the workpiece along the strip-shaped mounting base into the contour groove.

2. The feeding mechanism according to claim 1, characterized in that, The strip mounting base includes a strip-shaped X-axis base and an assembly strip for multiple workpieces to be movably mounted; the upper surface of the X-axis base is provided with an X-axis guide rail along its length; the X-axis base is also provided with an adsorption assembly for fixing and adsorbing the assembly strip onto the X-axis guide rail.

3. The feeding mechanism according to claim 2, characterized in that, The upper surface of the X-guide rail is provided with a positioning groove; the assembly strip is positioned and installed in the positioning groove by a positioning component.

4. The feeding mechanism according to claim 3, characterized in that, The X-guide rail is provided with multiple adsorption holes; the X-direction substrate is provided with a vacuum adsorption chamber; the positioning groove is connected to the vacuum adsorption chamber through the adsorption holes; the adsorption assembly includes multiple adsorption holes, the vacuum adsorption chamber, a vacuum pump for controlling the air pressure in the vacuum adsorption chamber, and a suction pipe connecting the vacuum pump and the vacuum adsorption chamber.

5. The feeding mechanism according to claim 2, characterized in that, The strip mounting base is provided in two sets; the pushing assembly includes two X-axis slide rails respectively disposed on the outer surface of the strip mounting base, two sliders respectively slidably connected to the X-axis slide rails, and a second driving assembly for driving any of the sliders to move along the X-axis; the upper end of the slider is provided above the X-axis base and is provided with a pushing block slidably connected to the corresponding X-axis guide rail; the side surface of the pushing block facing the workpiece is provided with a pushing part for pushing the workpiece.

6. The feeding mechanism according to claim 5, characterized in that, Both sliders are fixedly mounted with a locking block below them; the locking block has a insertion slot in the middle; the second drive assembly includes a locking block that is inserted into either of the insertion slots, a Y-axis drive cylinder that drives the locking block to move between the two locking blocks, and an X-axis linear motor that drives the locking block and the Y-axis drive cylinder to move along the X-axis.

7. The feeding mechanism according to claim 6, characterized in that, The second drive assembly also includes a pressure sensor for detecting the pressure of the latching block and a compression spring that provides elastic force to the latching block.

8. The feeding mechanism according to any one of claims 1-7, characterized in that, Multiple sets of feeding modules are arranged side by side; the feeding module also includes a support column and a third drive component that drives the support column to move between the multiple sets of feeding modules; the feeding head is fixedly installed on the upper end of the support column.

9. The feeding mechanism according to claim 1, characterized in that, The first clamping assembly includes a first clamping plate, a second clamping plate, and a first clamping cylinder that drives the first clamping plate and the second clamping plate to move laterally closer or further away; the front end of the strip-shaped mounting base extends between the first clamping plate and the second clamping plate; the first clamping plate and the second clamping plate are respectively provided with outwardly protruding limiting portions on their opposite sides; when the first clamping plate and the second clamping plate are clamped in place, the two limiting portions cooperate with each other to prevent the workpiece from sliding outward from the waiting position at the front end of the strip-shaped mounting base.

10. The feeding mechanism according to claim 1, characterized in that, The second clamping assembly includes a first clamping jaw, a second clamping jaw, and a second clamping cylinder that drives the first and second clamping jaws to move longitudinally closer or further away; the fixing block is located between the first and second clamping jaws; the fixing block has a first clearance groove on each side of the contour groove for the first clamping jaw to extend into the contour groove, and a second clearance groove for the second clamping jaw to extend into the contour groove; the clamping end of the first clamping jaw has a first groove that matches the outer contour of the middle part of the workpiece, and a pushing part that pushes a single workpiece into the contour groove and restricts the workpiece from detaching from the contour groove; the clamping end of the second clamping jaw has a second groove that inserts into the end of the workpiece.

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