A multi-station processing device

Abstract

The application discloses a kind of multi-station processing device, including rack, drive unit, main shaft and tray, the main shaft is rotatably connected with rack and can rotate under the action of drive unit, the tray is rotatably connected with main shaft by first one-way bearing, multiple stations are provided on the tray along the circumference, the station includes clamping unit, the clamping unit can clamp workpiece and movably connect with tray, the rack is equipped with multiple processing units corresponding with clamping unit, when the drive unit drives main shaft positive rotation, the main shaft and tray rotate synchronously, can make each station pass multiple processing units in turn, to be sequentially processed by multiple processing units, when the drive unit drives main shaft reverse rotation, the tray is stationary, the main shaft can drive clamping unit to move by transmission assembly, to make processing unit process workpiece at corresponding station.The application is ingenious in structure, can multi-station simultaneous processing, low in cost and easy to operate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machining, in particular to a multi-station machining device. BACKGROUND

[0002] Industrial assembly line usually comprises multiple stations, each station only focuses on processing a certain segment of work, and workpieces are sequentially machined at multiple stations to finally obtain finished products, which is conducive to improving work efficiency and output, and conforms to production practice. Generally speaking, the assembly line usually has multiple drives and relatively complex structure, and has high cost. In addition, the assembly line also includes a feeding end and a discharging end, occupies a large space, and also needs to increase additional workers to arrange orderly feeding and discharging, which is not conducive to reducing labor costs, and is not suitable for small-batch and multi-variety product machining, and is also difficult to popularize and apply in small enterprises. SUMMARY

[0003] The present application discloses a multi-station machining device, which solves the technical problems of high cost, large occupation and complex structure of the multi-station assembly line in the prior art, and has the technical effects of ingenious structure, multi-station simultaneous machining, low cost and convenient operation. The technical scheme adopted is as follows:

[0004] A multi-station machining device, comprising a rack, a driving unit, a main shaft and a tray, the main shaft is rotatably connected with the rack and can rotate under the action of the driving unit, the tray is rotatably connected with the main shaft through a first one-way bearing, a plurality of stations are arranged on the tray in the circumferential direction, the station comprises a clamping unit, the clamping unit can clamp a workpiece and is movably connected with the tray, a plurality of machining units corresponding to the clamping unit are arranged on the rack, when the driving unit drives the main shaft to rotate forward, the main shaft and the tray rotate synchronously, so that each station can pass through the plurality of machining units in turn to be sequentially machined by the plurality of machining units, when the driving unit drives the main shaft to rotate reversely, the tray is stationary, and the main shaft can drive the clamping unit to move through a transmission assembly, so that the machining unit can machine the workpiece at the corresponding station.

[0005] On the basis of the above technical scheme, the clamping unit comprises a rotating shaft, the rotating shaft is rotatably connected with two vertical plates on the tray at both ends, a clamping block is fixedly connected to the rotating shaft, the clamping block can clamp a workpiece and carry the workpiece to rotate, when the driving unit drives the main shaft to rotate reversely, the main shaft drives the rotating shaft to rotate through the transmission assembly, so as to facilitate the machining unit to machine the workpiece.

[0006] On the basis of the above technical scheme, the transmission assembly comprises a driving bevel gear coaxially fixed to the main shaft, a plurality of driven bevel gears meshing with the driving bevel gear, and the driven bevel gears are arranged one by one corresponding to the rotating shaft and can transmit rotary motion to the rotating shaft.

[0007] On the basis of the above technical scheme, the tray area corresponding to the station position is provided with a blanking hole, and the generated waste can be discharged downward through the blanking hole.

[0008] On the basis of the above technical scheme, further comprising a cam, a plurality of connecting rod units and a plurality of swing rods, the station, swing rod and connecting rod unit are one-to-one corresponding, the swing rod is hinged at the middle segment position, the first end of the swing rod is fixedly connected with the processing unit, the second end of the swing rod is hinged with the end of the connecting rod unit, the cam is rotatably connected with the main shaft through the second one-way bearing, and the outer edge surface of the cam includes a plurality of convex parts arranged circumferentially, the connecting rod unit is arranged circumferentially around the cam, and the first end of the connecting rod unit abuts against the outer edge surface of the cam, when the main shaft rotates forwardly, the cam is static, and the cam can drive the processing unit away from the workpiece through the connecting rod unit, when the main shaft rotates reversely, the cam rotates synchronously with the main shaft, and the cam can drive the processing unit to approach the workpiece through the connecting rod unit, so as to facilitate the processing of the workpiece.

[0009] On the basis of the above technical scheme, the number of convex parts is the same as or an integer multiple of the number of stations, the convex part includes an arc surface, and the axis of the annular surface formed by the plurality of arc surfaces is collinear with the rotation axis of the cam, and the outer edge surface of the cam between the two adjacent arc surfaces is smoothly transitioned.

[0010] On the basis of the above technical scheme, the connecting rod unit includes a compression spring, a first connecting rod, a second connecting rod and a third connecting rod hinged with each other, the first connecting rod is horizontally slidably arranged on the rack, and the first end of the first connecting rod abuts against the outer edge surface of the cam laterally, the compression spring is coaxially arranged outside the first connecting rod, one end of the compression spring is fixedly connected with the first end of the first connecting rod, and the other end of the compression spring is fixedly connected with the rack, the third connecting rod is vertically slidably arranged on the rack, and the second end of the third connecting rod is hinged with the swing rod, when the cam rotates, the third connecting rod end can be driven to float up and down, so as to drive the processing unit to swing.

[0011] On the basis of the above technical scheme, the clamping block includes a U-shaped piece, the two ends of the U-shaped piece are rotatably connected with the two vertical plates through the rotating shafts, the U-shaped piece includes a U-shaped groove, the bottom surface of the U-shaped groove is provided with a recess, one end of the workpiece can be embedded into the recess and clamped by the recess, and when the workpiece is clamped by the recess, the center of the region to be processed on the workpiece is on the axis of the rotating shaft.

[0012] On the basis of the above technical scheme, the inner wall surface of the recess is in clearance fit with the workpiece, the two side walls of the recess are provided with two limiting holes extending outwardly, a limiting spring is embedded in the limiting hole, one end of the limiting spring close to the recess is fixedly connected with a limiting ball, and the limiting ball partially extends into the recess, when the workpiece extends into the recess, the two limiting balls can press the workpiece tightly against the inner bottom surface of the recess.

[0013] On the basis of the above technical solutions, the clamping block is further provided with a through hole extending axially and forming two ports on the end face of the clamping block, the through hole is communicated with the recessed cavity, and the recessed cavity is convenient to clean.

[0014] Advantages

[0015] The application has a clever design, includes multiple circumferentially arranged workstations, so that the feeding and discharging operations can be completed at the same position, thereby reducing labor costs, and the application has a small footprint and flexible arrangement, and can be applied in a small space. In addition, the application has a delicate design, and the workpiece conveying, workpiece driving and displacement of the machining unit are realized by a driving unit, so that the structure is clever and the automation degree is high, the production cost can be greatly reduced, and in addition, the single driving realizes multiple actions, which is beneficial to ensure good cooperation between the multiple actions, is beneficial to realize stable and rapid operation, and is beneficial to improve the machining efficiency.

[0016] In the application, the workpiece is embedded into the clamping block to fix the workpiece, the structure design is reasonable, the clamping stability is good on the one hand, and the clamping and operation of small and delicate workpieces can be applied on the other hand, and in addition, the workpiece can be conveniently taken and placed by the worker through the spring clamping mode, and the operation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only one embodiment of the application, and for those skilled in the art, other drawings can be obtained from the provided drawings without creative labor.

[0018] Figure 1 : Structure schematic view of front view of the application;

[0019] Figure 2 : Three-dimensional structure schematic view of the application;

[0020] Figure 3 : Three-dimensional structure schematic view of the application after removing the tray;

[0021] Figure 4 : Mechanism schematic view of the cam;

[0022] Figure 5 : Three-dimensional structure schematic view of the clamping unit clamping the workpiece;

[0023] Figure 6 : Schematic view of the workpiece before and after machining; DETAILED DESCRIPTION

[0024] The following description and accompanying drawings fully illustrate specific embodiments described herein to enable those skilled in the art to practice them. Some embodiments may include or substitute parts and features of other embodiments. The scope of the embodiments herein encompasses the entire scope of the claims and all available equivalents thereof. Throughout this document, the terms “first,” “second,” etc., are used only to distinguish one element from another without requiring or implying any actual relationship or order between the elements. Indeed, a first element can also be referred to as a second element, and vice versa. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a structure, apparatus, or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the structure, apparatus, or device that includes said element. The various embodiments described herein are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.

[0025] The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in this document to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. They are used solely for the convenience of describing the document and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description herein, unless otherwise specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two elements; they can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0026] In this document, unless otherwise stated, the term "multiple" means two or more.

[0027] In this article, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0028] In this article, the term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0029] like Figures 1-5The multi-station processing device shown includes a frame 1, a drive unit 2, a spindle 3, a tray 4, and a cam 8.

[0030] like Figures 1-3 As shown, the frame 1 is a frame structure. In this embodiment, the frame 1 is a triangular prism structure, and a first horizontal frame 11 and a second horizontal frame 12 are fixed on the frame 1. The two ends of the main shaft 3 are rotatably connected to the first horizontal frame 11 and the second horizontal frame 12 respectively. Bearings are sleeved at the rotatable connection. The drive unit 2 includes a servo motor. The servo motor is fixedly connected to the second horizontal frame 12 upward through a motor base. The rotor end of the servo motor, which can rotate forward and backward, is connected to the main shaft 3 through a coupling, so that the rotational motion can be transmitted to the main shaft 3.

[0031] like Figure 2 As shown, the tray 4 is rotatably connected to the spindle 3 via a first one-way bearing. Three workstations are arranged circumferentially on the tray 4 to perform welding, grinding, cleaning, and loading / unloading, respectively. In other embodiments of the invention, multiple workstations can be provided, depending on actual production needs. Each workstation includes a clamping unit 6, which clamps the workpiece and is movably connected to the tray 4. Specifically, the clamping unit 6 includes a rotating shaft 61, which is divided into two sections connected by a clamping block 62. Both ends of the rotating shaft 61 are rotatably connected to two upright plates on the tray 4. Bearings are fitted at the rotatable connection points between the rotating shaft 61 and the upright plates. The clamping block 62 can clamp the workpiece. Furthermore, each area of ​​the tray 4 corresponding to the three workstations is provided with a discharge port 41, facilitating the downward discharge of processing waste through the discharge port 41.

[0032] like Figure 2 and 3 As shown, three processing units 5 are respectively provided on the three prisms of the frame 1, and the included angle between two adjacent processing units 5 corresponds to the included angle between two adjacent clamping units 6. In this embodiment, the three processing units 6 are a welding gun unit, a grinding head unit, and a blowing unit. The grinding head unit includes a grinding steel brush, which can wrap around the workpiece processing position and grind it. The blowing unit includes an air nozzle, which faces the workpiece processing position and is connected to an external air source. By rotating the tray 4, each station can pass through the three processing units 5 in sequence and complete the three processing steps sequentially. In other embodiments of the present invention, there can be multiple processing units 5, and the number of processing units 5 matches the number of workpiece processing steps. In addition, the positional relationship between two adjacent processing units 5 corresponds to the positional relationship between two adjacent stations, which has good applicability and flexibility.

[0033] When the drive unit 2 drives the spindle 3 to rotate in the forward direction, the spindle 3 and the tray 4 rotate synchronously, allowing each workstation to pass through three processing units 5 sequentially for processing by multiple processing units 4. When the drive unit 2 drives the spindle 3 to rotate in the reverse direction, the tray 4 remains stationary, and the spindle 3 can drive the clamping unit 6 to move via the transmission assembly 7, enabling the processing unit 5 to process the workpiece at the corresponding workstation. Specifically, the transmission assembly 7 includes a driving bevel gear 71 coaxially fixed to the spindle 3. In this embodiment, the driving bevel gear 71 meshes with three driven bevel gears 72, and the three driven bevel gears 72 are coaxially fixed to the rotating shafts 61 at the three workstations. Thus, when the drive unit 2 drives the spindle 3 to rotate in the reverse direction, the tray 4 remains stationary, and the spindle 3 drives the rotating shaft 61 to rotate via the gear transmission assembly 7, thereby causing the workpiece to rotate accordingly, facilitating the processing unit 5 to process the workpiece. In other embodiments of the present invention, the number of driven bevel gears 72 may also be multiple, corresponding to the number of workstations.

[0034] To facilitate control of the machining unit 5, this application also includes a cam 8, three linkage units 9, and three rocker arms 10.

[0035] Cam 8 is rotatably connected to main shaft 3 via a second one-way bearing. When main shaft 3 rotates in the forward direction, cam 8 remains stationary; when main shaft 3 rotates in the reverse direction, cam 8 rotates synchronously with main shaft 3. Figure 4 As shown, the outer edge surface of the cam 8 includes a plurality of circumferentially arranged protrusions 81. In this embodiment, there are three protrusions 81, which is the same as the number of workstations. In other embodiments of the present invention, the number of protrusions 81 can be an integer multiple of the number of workstations, such as... Figure 4 As shown, the convex part 81 includes an arc surface, and the axis of the annular surface formed by the three arc surfaces is collinear with the rotation axis of the cam 8. The outer edge surface of the cam between two adjacent arc surfaces transitions smoothly, which is conducive to stable operation.

[0036] like Figure 3 As shown, the three workstations, three rocker arms 10, and three-bar linkage units 9 are arranged in a one-to-one correspondence. The rocker arm 10 is hinged to the end of the vertical rod on the frame 1 at its middle position. The first end of the rocker arm 10 is fixed to the processing unit 5, and the second end of the rocker arm 10 is hinged to the end of the linkage unit 9. Specifically, the three-bar linkage units 9 are evenly arranged around the cam 8. Figure 3As shown, the linkage unit 9 includes a compression spring 94, a first linkage 91, a second linkage 92, and a third linkage 93 that are hinged together. The first linkage 91 is horizontally slidably mounted on the second horizontal frame 12, and the first end of the first linkage 91 is rotatably connected to a roller 95. The roller surface of the roller 95 abuts against the outer edge of the cam 8. The compression spring 94 is coaxially sleeved outside the first linkage 91. One end of the compression spring 94 is fixedly connected to the first end of the first linkage 91, and the other end of the compression spring 94 is fixedly connected to the frame 1. The first end of the second linkage 92 is hinged to the end of the first linkage 91, and the end of the second linkage 92 is hinged to the first end of the third linkage 93. The third linkage 93 is vertically slidably mounted on the prism of the frame 1, and the end of the third linkage 93 is hinged to the second end of the swing arm 10.

[0037] In addition, such as Figure 4 As shown, the linkage unit 9 is designed such that when the spindle 3 rotates in the forward direction, the tray 4 rotates synchronously with the spindle 3, and the cam 8 remains stationary. At this time, the roller 95 abuts against the outer edge surface of the cam 8 between the two protrusions 81. That is, at this time, the tray 4 drives the workpiece on the workstation to move, and the cam 8 drives the processing unit 5 away from the workpiece through the linkage unit 9. When the spindle 3 rotates in the reverse direction, the tray 4 remains stationary, and the spindle 3 transmits the rotational motion to the rotating shaft 61. At this time, the workstation position is fixed, the clamping block 62 drives the workpiece to rotate, and the cam 8 drives the processing unit 5 closer to the workpiece through the linkage unit 9, which facilitates the processing of the workpiece. In other words, the rotation of the cam 8 can drive the end of the third linkage 93 to float up and down, thereby driving the processing unit 5 to swing, so that the processing unit 5 moves closer to or away from the workpiece.

[0038] In this application, such as Figure 5 As shown, the clamping block 62 includes a U-shaped component, with both ends of the U-shaped component fixedly connected to two rotating shafts 61. The U-shaped component includes a U-shaped groove, and a cavity 621 is provided on the bottom surface of the U-shaped groove. The cavity 621 extends vertically along the bottom surface of the groove. The inner wall of the cavity 621 is clearance-fitted with the workpiece. Two outwardly extending limiting holes are provided on the two side walls of the cavity 621. Limiting springs 622 are embedded in the limiting holes. A limiting ball 623 is fixedly connected to one end of the limiting spring 622 near the cavity 621, and the limiting ball 623 partially extends into the cavity 621. In this embodiment, the workpiece is a pull tab, such as... Figure 6As shown, the device includes a metal strip with a circular cross-section. One end of the metal strip is bent into a triangle, and the other end extends outside the triangle and is threaded. When the workpiece is inserted into the cavity 621, it can press inward against the two limiting balls 623. When the workpiece continues to extend and one side of the triangle abuts against the bottom surface of the cavity 621, the workpiece releases the limiting balls 623, while the limiting balls 623 press the workpiece firmly against the bottom surface of the cavity 621. Thus, one end of the workpiece is embedded in and held securely within the cavity 621. Furthermore, the cavity 621 is designed such that when the workpiece is held by the cavity 621, the center of the area to be processed on the workpiece is on the axis of the rotating shaft 61. In this embodiment, the workpiece has a processing area as shown... Figure 5 As shown.

[0039] In addition, the clamping block 62 is provided with two through holes 624. The through holes 624 extend axially and form two ports on the end face of the clamping block 62. The through holes 624 communicate with the cavity, which facilitates cleaning of the cavity 621. In this embodiment, a plug is embedded in the through hole 624. The plug can be removed when cleaning is required.

[0040] Work process

[0041] In the initial state, the roller 95 is designed to abut against the outer edge of the cam between the two protrusions 81. At this time, the processing unit corresponds to the workstation position, and the third link 93 drives the processing unit 5 away from the workpiece.

[0042] First, the worker pushes the buckle to be processed into the cavity, and the clamping block holds the workpiece.

[0043] Afterwards, the external PLC controller controls the servo motor to reverse. At this time, the tray 4 is stationary, and the spindle 3 transmits the rotational motion to the rotating shaft 61 through the transmission component 7. The cam rotates synchronously with the spindle. The rotation of the cam drives the roller 95 to contact the protrusion 81. Then, the third link 93 drives the processing unit 5 to approach the workpiece to be processed area and then move away from the workpiece to be processed area. During the period when the roller 95 is in contact with the arc surface on the protrusion 81, the processing unit 5 processes the workpiece.

[0044] Afterwards, the external PLC controller controls the servo motor to rotate 120° forward. At this time, the cam 8 is stationary, the tray 4 moves accordingly, and the workpiece is transported to the next station.

[0045] Then, the external PLC controller controls the motor to reverse, and the next processing unit 5 performs the next process on the workpiece.

[0046] This process is repeated until all the workpiece processes are completed. When the workpiece is moved to the loading / unloading station, the workpiece is removed and the next workpiece is clamped in the cavity 621.

[0047] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A multi-station processing apparatus, characterized by, The utility model provides a kind of multi-station machining device, including rack (1), drive unit (2), main shaft (3) and tray (4), the main shaft (3) is rotatably connected with rack (1) and can rotate under the action of drive unit (2), the tray (4) is rotatably connected with main shaft (3) by first one-way bearing, the tray (4) is provided with multiple stations along circumference, the station includes clamping unit (6), the clamping unit (6) can clamp workpiece and movably connect with tray (4), the rack (1) is equipped with multiple machining units (5) corresponding with clamping unit (6), when the drive unit (2) drives main shaft (3) positive rotation, the main shaft (3) and tray (4) synchronous rotation, can make each station pass multiple machining units (5) in turn, to be sequentially processed by multiple machining units (5), when the drive unit (2) drives main shaft (3) reverse rotation, the tray (4) is stationary, the main shaft (3) can drive clamping unit (6) to move by transmission assembly (7), to make machining unit (5) process workpiece at corresponding station; Also including cam (8), multiple connecting rod units (9) and multiple swing rods (10), the station, swing rod (10) and connecting rod unit (9) are set up one by one corresponding, swing rod (10) is hinged at middle section position with rack (1), the first end of swing rod (10) is fixedly connected with machining unit (5), the second end of swing rod (10) is hinged with the end of connecting rod unit (9), the cam (8) is rotatably connected with main shaft (3) by second one-way bearing, and the outer edge surface of the cam (8) includes circumferentially arranged several convex parts (81), the connecting rod unit (9) is arranged around the cam (8) circumferentially and its first end is abutted with the outer edge surface of the cam (8), when the main shaft (3) positive rotation, the cam (8) is stationary, and the cam (8) can drive machining unit (5) away from workpiece by connecting rod unit (9), when the main shaft (3) reverse rotation, the cam (8) and main shaft (3) synchronous rotation, and the cam (8) can drive machining unit (5) close to workpiece by connecting rod unit (9), to facilitate processing workpiece.

2. The multi-station processing apparatus according to claim 1, wherein The clamping unit (6) includes a rotating shaft (61), the rotating shaft (61) is rotatably connected with two vertical plates on the tray (4), the rotating shaft (61) is fixedly connected with a clamping block (62), the clamping block (62) can clamp workpieces and rotate with the workpieces, when the drive unit (2) drives the main shaft (3) reverse rotation, the main shaft (3) drives the rotating shaft (61) to rotate by the transmission assembly (7), to facilitate the machining unit (5) to process workpieces.

3. The multi-station processing apparatus of claim 2, wherein, The transmission assembly (7) includes a driving bevel gear (71) coaxially fixed with the main shaft (3), the driving bevel gear (71) is engaged with multiple driven bevel gears (72), the driven bevel gears (72) are arranged one by one corresponding to the rotating shaft (61) and can transmit rotary motion to the rotating shaft (61).

4. The multi-station processing apparatus of claim 2, wherein, The area of the tray (4) corresponding to the station position is provided with a blanking port (41), and the waste generated by processing can be discharged downward through the blanking port (41).

5. The multi-station processing apparatus according to any one of claims 2 to 4, characterized by The number of the convex parts (81) is same as or integral multiple of the number of the stations, the convex parts (81) comprise curved surfaces, and the axis of the annular surface enclosed by the curved surfaces is collinear with the rotation axis of the cam (8), and the outer edge surface of the cam (8) between the adjacent curved surfaces is smoothly connected.

6. The multi-station processing apparatus of claim 5, wherein, The connecting rod unit (9) comprises a compression spring (94), a first connecting rod (91), a second connecting rod (92) and a third connecting rod (93) hingedly connected, the first connecting rod (91) is horizontally slidably arranged on the rack (1), and the first end of the first connecting rod (91) is laterally in contact with the outer edge surface of the cam (8), the compression spring (94) is coaxially sleeved on the first connecting rod (91), one end of the compression spring (94) is fixedly connected with the first end of the first connecting rod (91), and the other end of the compression spring (94) is fixedly connected with the rack (1), the third connecting rod (93) is vertically slidably arranged on the rack (1), and the second end of the third connecting rod (93) is hingedly connected with the swing rod (10), and when the cam (8) rotates, the third connecting rod (93) is driven to float up and down at the end to drive the machining unit (5) to swing.

7. The multi-station processing apparatus of claim 6, wherein, The clamping block (62) comprises a U-shaped piece, two ends of the U-shaped piece are rotationally connected with two vertical plates through rotation shafts (61) respectively, the U-shaped piece comprises a U-shaped groove, the bottom surface of the U-shaped groove is provided with a concave cavity (621), one end of the workpiece can be embedded into the concave cavity (621) and clamped by the concave cavity (621), and when the workpiece is clamped by the concave cavity (621), the center of the region to be machined on the workpiece is on the axis of the rotation shaft (61).

8. The multi-station machining device according to claim 7, characterized in that The inner wall surface of the concave cavity (621) is in clearance fit with the workpiece, the two side walls of the concave cavity (621) are provided with two limiting holes extending outward, a limiting spring (622) is embedded in each limiting hole, one end of the limiting spring (622) close to the concave cavity (621) is fixedly connected with a limiting ball (623), and the limiting ball (623) partially extends into the concave cavity (621), when the workpiece extends into the concave cavity (621), the two limiting balls (623) can press the workpiece against the inner bottom surface of the concave cavity (621).

9. The multi-station machining device according to claim 8, characterized in that The clamping block (62) is also provided with a through hole (624), the through hole (624) extends axially and forms two ports on the end surface of the clamping block (62), the through hole (624) is in communication with the concave cavity (621), and the concave cavity (621) is convenient to clean.

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