A broaching machine workpiece positioning mechanism

Abstract

The application discloses a workpiece positioning mechanism of broach machining machine tool, which comprises a mounting seat and a rotating ring, a stepped hole for placing a workpiece is formed in the mounting seat, and no less than three groups of clamping mechanisms are arranged in the mounting seat and arranged in a circumferential array along the axis of the stepped hole; the clamping mechanism comprises a clamping rod and a supporting rod; a corresponding number of first mounting grooves corresponding to the clamping mechanisms are formed around the periphery of the stepped hole on the mounting seat; the clamping rod is hingedly connected in the first mounting groove; the supporting rod is hingedly connected to the upper end surface of the rotating ring; and the end of the supporting rod away from the rotating ring is hingedly connected to the clamping rod. The rotating ring is driven to rotate around the stepped hole, so that the end portions of the plurality of clamping rods are synchronous to clamp the outer wall of the workpiece, thereby clamping and positioning the workpiece, and the axis of the workpiece remains consistent during each clamping; the workpiece is convenient to take, and the clamping rod is folded into the first mounting groove, so that the clamping rod does not hinder the placement of the workpiece, and the workpiece is convenient to place.

Description

Technical Field

[0001] This invention relates to the field of broaching technology, and more specifically to a workpiece positioning mechanism for a broaching machine tool. Background Technology

[0002] A broaching machine tool is a common type of cutting machine tool that uses a broach as a cutting tool to machine through holes, planes, and shaped surfaces on workpieces. This machine tool is characterized by its ability to machine various internal and external surfaces of different shapes, thus meeting a wide range of workpiece machining needs. The working principle of a broaching machine tool is to use parameters such as the broach's angle and trajectory to cut the workpiece surface, achieving high dimensional accuracy and low surface roughness, making it suitable for mass production. During broaching, the accuracy of workpiece positioning is one of the key factors affecting machining quality; therefore, accurate workpiece positioning is necessary to improve machining quality and efficiency.

[0003] When machining splines, internal gears, and other workpieces using broaches, a clamping mechanism is required to clamp and limit the workpiece. Chinese Patent Publication No. CN104924106A discloses a broaching machine feed plate, which is used on a broaching machine to clamp the workpiece. This patented solution provides a certain positioning effect on the workpiece along its circumference. The patented solution includes a mounting base, a transition piece, a first positioning rod, a second positioning rod, a sliding plate, a clamping and positioning mechanism, and a chip removal block fixed to the mounting base. The clamping and positioning mechanism includes a clamping block that slides radially along the cavity to the sliding plate and an elastic element that supports the clamping block radially between the clamping block and the sliding plate to provide radially inward elastic force to the clamping block. This patented solution clamps and positions the workpiece within the cavity of the sliding plate through the clamping and positioning mechanism, providing a certain positioning effect on the workpiece along its circumference. However, in the disclosed device, the workpiece has a certain amount of displacement in the horizontal direction. When the workpiece is mounted on the structure for processing, it is easy for the workpiece to shift during processing, which can cause the internal through hole and the external surface to be out of axis, thus failing to guarantee processing accuracy. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned technical problems and provide a workpiece positioning mechanism for broaching machine tools, which can achieve multi-directional positioning and clamping of the workpiece.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A workpiece positioning mechanism for a broaching machine tool includes a mounting base and a rotating ring disposed in the mounting base. The mounting base has a stepped hole for placing the workpiece. The rotating ring is rotatably connected to the mounting base and is coaxially arranged with the stepped hole. The mounting base is provided with no less than three sets of clamping mechanisms arranged circumferentially along the axis of the stepped hole. Each clamping mechanism includes clamping rods and support rods disposed in the mounting base. The mounting base has a number of first mounting slots corresponding to the number of clamping mechanisms around the stepped hole. Each of the first mounting slots is hinged to a clamping rod. A support rod is hinged to the upper surface of the rotating ring. The end of the support rod away from the rotating ring is hinged to the clamping rod. When clamping and positioning the workpiece, the rotating ring rotates, driving the support rod to push the clamping rod towards the workpiece, so that the ends of the multiple clamping rods away from the first mounting slots are simultaneously clamped on the outer side wall of the workpiece. When removing the workpiece, the rotating ring drives the multiple clamping rods to rotate simultaneously into the first mounting slots to release the workpiece from the clamping state.

[0007] Furthermore, a second mounting cavity is provided on one side of the mounting base. A first rotating shaft arranged perpendicular to the stepped hole is rotatably connected in the second mounting cavity. A worm with helical teeth is provided on the first rotating shaft. The outer wall of the rotating ring is provided with meshing teeth to form a worm wheel. The worm meshes with the worm wheel on the outer wall of the rotating ring to form a worm wheel and worm gear transmission.

[0008] Furthermore, the first rotating shaft has a threaded section on its shaft body, which is connected to a movable nut via a threaded connection. The upper surface of the mounting base has a groove communicating with the second mounting cavity. The groove is parallel to the first rotating shaft. A sliding pin is fixedly connected to the movable nut, extending through the groove to above the upper surface of the mounting base. A stop frame for blocking the upper surface of the workpiece is provided at the upper end of the mounting base. The stop frame is located on the side of the groove closer to the workpiece and is rotatably connected to the mounting base via the second rotating shaft. A fixed post is installed on the stop frame, located on the side of the second rotating shaft away from the sliding pin. A tension spring connects the fixed post and the sliding pin. When clamping and positioning the workpiece, the first rotating shaft drives the sliding pin on the movable nut to move, and the tension spring moves to one side of the second rotating shaft, pulling the stop frame to rotate and abut against the upper surface of the workpiece to block it. When removing the workpiece, the first rotating shaft drives the sliding pin on the movable nut to move in the opposite direction, and the tension spring moves to the other side of the second rotating shaft, causing the stop frame to rotate to the other side and disengage from blocking the workpiece.

[0009] Furthermore, a first limiting post and a second limiting post are fixedly connected to the mounting base, with the first limiting post and the second limiting post located on both sides of the baffle frame, respectively.

[0010] Furthermore, the material stop includes a first horizontal plate, a vertical column, and a second horizontal plate. The second rotating shaft is fixedly connected to the lower surface of the first horizontal plate, the vertical column is fixedly connected to the upper surface of the first horizontal plate, and the second horizontal plate is fixedly connected to the upper end of the vertical column. When clamping and positioning the workpiece, the end of the second horizontal plate away from the vertical column is located above the workpiece.

[0011] Furthermore, a clamping column is fixedly connected to the lower surface of the second transverse plate away from the vertical column. The lower end of the clamping column is provided with a first guide chamfer, and the clamping column is used to limit the upper surface of the workpiece.

[0012] Furthermore, the mounting base has a third mounting cavity, one end of the first rotating shaft extends into the third mounting cavity and is fixedly connected to a first bevel gear, the mounting base is rotatably connected to a vertically arranged third rotating shaft, the lower end of the third rotating shaft extends into the third mounting cavity and is fixedly connected to a second bevel gear, the second bevel gear meshes with the first bevel gear to form a gear transmission, and the upper end of the third rotating shaft extends to the outside of the mounting base and is fixedly connected to a rotating wheel.

[0013] Furthermore, an arc-shaped groove is formed on the outer edge of the rotating wheel.

[0014] Furthermore, the mounting base includes a cover plate that covers the top of the rotating ring. A placement hole is provided in the middle of the cover plate. The diameter of the placement hole is larger than the outer diameter of the workpiece. The placement hole is coaxially arranged with the stepped hole.

[0015] Furthermore, the upper opening of the placement hole is provided with a second guide chamfer.

[0016] The present invention provides a workpiece positioning mechanism for a broaching machine tool, which has the following advantages: By driving a rotating ring to rotate around a stepped hole, the support rod connected to the rotating ring rotates, driving the clamping rod to rotate, and causing the ends of multiple clamping rods to clamp the outer wall of the workpiece synchronously, thereby clamping and positioning the workpiece. Furthermore, the multiple clamping rods and the support rod are aligned so that the ends of the clamping rods are on an arc coaxial with the stepped hole, thus ensuring that the axis of the workpiece clamped by the clamping rod is coaxial with the stepped hole, thereby positioning the workpiece and ensuring that the workpiece axis remains consistent each time it is clamped. When the workpiece is removed, the rotating ring rotates, causing the support rod to rotate in the opposite direction, driving the clamping rod to rotate into the first mounting groove. The clamping rod detaches from the workpiece and folds into the first mounting groove, thereby releasing the clamp and facilitating workpiece removal. Moreover, when the clamping rod is folded into the first mounting groove, it does not obstruct workpiece placement, facilitating workpiece placement. Attached Figure Description

[0017] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings:

[0018] Figure 1 A top view of a workpiece positioning mechanism for a broaching machine tool provided by the present invention;

[0019] Figure 2 A top sectional view of a workpiece positioning mechanism for a broaching machine tool provided by the present invention;

[0020] Figure 3 This invention provides a front sectional view of a workpiece positioning mechanism for a broaching machine tool.

[0021] Figure 4 A partial frontal cross-sectional view of the third rotating shaft portion in a workpiece positioning mechanism of a broaching machine tool provided by the present invention;

[0022] Figure 5 A schematic diagram of the rotating ring in a workpiece positioning mechanism of a broaching machine tool provided by the present invention;

[0023] Figure 6 for Figure 1 Schematic diagram of a partial structure at part A in the middle;

[0024] Figure 7 This is a partial structural diagram of the workpiece positioning mechanism of a broaching machine tool provided by the present invention, showing the cooperation between the stop and the sliding pin.

[0025] The following are the labeling instructions in the diagram: 1. Mounting base; 11. Slide groove; 12. Third mounting cavity; 13. Cover plate; 2. Rotating ring; 3. Clamping mechanism; 31. Clamping rod; 32. Support rod; 4. First mounting groove; 5. Second mounting cavity; 6. First rotating shaft; 61. Worm gear; 62. Threaded rod segment; 63. Moving nut; 64. Sliding pin; 65. First bevel gear; 7. Material stop; 71. First horizontal plate; 72. Vertical column; 73. Second horizontal plate; 74. Pressing column; 81. Second rotating shaft; 82. Fixed column; 83. Tension spring; 84. First limiting column; 85. Second limiting column; 9. Third rotating shaft; 91. Second bevel gear; 92. Rotating wheel; 921. Arc-shaped groove; 10. Workpiece. Detailed Implementation

[0026] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that in the embodiments of the present invention, all directional indications (such as up-down-left-right-forward-backward...) are only used to explain the relative positional relationship and movement between the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0029] like Figures 1-7 As shown, a workpiece positioning mechanism for a broaching machine tool includes a mounting base 1 and a rotating ring 2 disposed in the mounting base 1. The mounting base has a stepped hole for placing a workpiece 10. The rotating ring 2 is rotatably connected to the mounting base and is coaxially arranged with the stepped hole. The mounting base 1 is provided with at least three sets of clamping mechanisms 3 arranged circumferentially along the axis of the stepped hole. Each clamping mechanism 3 includes a clamping rod 31 and a support rod 32 disposed in the mounting base 1. The mounting base 1 has a number of first mounting slots 4 corresponding to the number of clamping mechanisms 3 around the stepped hole. Each mounting groove 4 is hinged with a clamping rod 31. The upper end of the rotating ring 2 is hinged with a support rod 32. The end of the support rod 32 away from the rotating ring 2 is hinged to the clamping rod 31. When clamping and positioning the workpiece 10, the rotating ring 2 rotates and drives the support rod 32 to push the clamping rod 31 toward the workpiece 10, so that the ends of multiple clamping rods 31 away from the first mounting groove 4 are simultaneously clamped on the outer ring side wall of the workpiece 10. When the workpiece 10 is removed, the rotating ring 2 drives multiple clamping rods 31 to rotate inward into the first mounting groove 4 at the same time to move away from the workpiece 10 and release the clamping state of the workpiece 10.

[0030] By adopting the above technical solution, the rotating ring 2 is driven to rotate around the stepped hole, and the support rod 32 connected to the rotating ring 2 rotates, which drives the clamping rod 31 to rotate. This causes the ends of multiple clamping rods 31 to simultaneously clamp the outer wall of the workpiece 10, thereby clamping and positioning the workpiece 10. The multiple clamping rods 31 and the support rod 32 are aligned so that the ends of the clamping rods 31 are on an arc coaxial with the stepped hole. This ensures that the axis of the workpiece 10 clamped by the clamping rods 31 is coaxial with the stepped hole, thus positioning the workpiece 10 and ensuring that the axis of the workpiece 10 remains consistent each time it is clamped. When the workpiece 10 is removed, the rotating ring 2 rotates, causing the support rod 32 to rotate in the opposite direction, which in turn causes the clamping rod 31 to rotate into the first mounting groove 4. The clamping rod 31 detaches from the workpiece 10 and folds into the first mounting groove 4, thereby releasing the clamp and facilitating the removal of the workpiece 10. Furthermore, when the clamping rod 31 is folded into the first mounting groove 4, it will not obstruct the placement of the workpiece 10, making it easier to place the workpiece 10. Specifically, the vertical projection of the clamping rod 31 near the workpiece 10 is an arc shape, and the arc-shaped end clamps the workpiece 10 to avoid damaging the workpiece 10.

[0031] Specifically, a second mounting cavity 5 is provided on one side of the mounting base 1. A first rotating shaft 6, arranged perpendicular to the stepped hole, is rotatably connected in the second mounting cavity 5. A worm gear 61 with helical teeth is provided on the first rotating shaft 6. The outer wall of the rotating ring 2 has meshing teeth forming a worm wheel. The worm gear 61 meshes with the worm wheel on the outer wall of the rotating ring to form a worm wheel and worm gear 61 transmission. By rotating the first rotating shaft 6, the worm gear 61 is driven to rotate, thereby driving the rotating ring 2 to rotate, realizing the clamping rod 31 to clamp or release the workpiece 10. The worm wheel and worm gear 61 transmission can achieve self-locking, so that the workpiece 10 is not easy to loosen when clamping, thus ensuring that the workpiece 10 is clamped and positioned accurately and stably.

[0032] Specifically, the first rotating shaft 6 has a threaded rod section 62, which is connected to a movable nut 63 via a threaded connection. The upper surface of the mounting base 1 has a groove 11 communicating with the second mounting cavity 5. The groove 11 is parallel to the first rotating shaft 6. A sliding pin 64 is fixedly connected to the movable nut 63, extending through the groove 11 to above the upper surface of the mounting base 1. A baffle 7 for blocking the upper surface of the workpiece 10 is provided at the upper end of the mounting base 1. The baffle 7 is located on the side of the groove 11 closest to the workpiece 10. The baffle 7 is rotatably connected to the mounting base 1 via a second rotating shaft 81. A fixing post 82 is mounted on the baffle 7. On the side of the second rotating shaft 81 away from the sliding pin 64, a tension spring 83 is connected between the fixed column 82 and the sliding pin 64. Specifically, one end of the tension spring 83 is fixedly connected to the fixed column 82, and the other end of the tension spring 83 is fixedly connected to the sliding pin 64. When the workpiece 10 is clamped and positioned, the first rotating shaft 6 drives the sliding pin 64 on the moving nut 63 to move. The tension spring 83 moves to the side of the second rotating shaft 81 and pulls the stop frame 7 to rotate and abut against the upper end of the workpiece 10 to block the workpiece 10. When the workpiece 10 is taken out, the first rotating shaft 6 drives the sliding pin 64 on the moving nut 63 to move in the opposite direction. The tension spring 83 moves to the other side of the second rotating shaft 81, causing the stop frame 7 to rotate to the other side and disengage from blocking the workpiece 10. When clamping and positioning workpiece 10, the first rotating shaft 6 is driven to rotate, thereby driving the rotating ring 2 to rotate and clamp workpiece 10. At the same time, the threaded rod segment 62 on the first rotating shaft 6 drives the moving nut 63 to move, which in turn drives the sliding pin 64 to move along the slide groove 11. This causes the tension spring 83 to move to one side of the second rotating shaft 81. When the line connecting the sliding pin 64 and the fixed post 82 is on the same side of the second rotating shaft 81, the tension spring 83 contracts, causing the stop frame 7 to rotate. This causes the stop frame 7 to rotate to abut against the upper end of workpiece 10 and block workpiece 10, limiting the vertical position of workpiece 10. This prevents workpiece 10 from moving upwards during processing and keeps its position stable during processing. When workpiece 10 is removed, the first rotating shaft 6 is driven to rotate in the opposite direction, thereby driving the rotating ring 2 to rotate in the opposite direction to release the clamping state of workpiece 10. At the same time, the threaded rod section 62 on the first rotating shaft 6 drives the moving nut 63 to move in the opposite direction, driving the sliding pin 64 to move in the opposite direction along the slide groove 11, and driving the sliding pin 64 to move to the other side of the second rotating shaft 81. When the tension spring 83 connected to the sliding pin 64 moves to the other side of the second rotating shaft 81, the tension spring 83 contracts, causing the stop 7 to rotate in the opposite direction, so that the stop 7 moves out from the upper end face of workpiece 10, thereby releasing the end limit of workpiece 10, making it easier to pick up workpiece 10. This achieves axial limitation of workpiece while limiting the vertical position of workpiece, thus making the positioning more accurate and stable. It should be noted that the reverse movement of each part when picking up workpiece 10 is relative to the movement direction of each part when clamping and positioning workpiece 10.

[0033] Specifically, a first limiting post 84 and a second limiting post 85 are fixedly connected to the mounting base 1, with the first limiting post 84 and the second limiting post 85 located on both sides of the material stop frame 7. By setting the first limiting post 84 and the second limiting post 85 on both sides of the material stop frame 7, the rotation range of the material stop frame 7 is limited, allowing the material stop frame 7 to rotate back and forth with the sliding pin 64, thereby achieving material blocking and release.

[0034] Specifically, the baffle 7 includes a first horizontal plate 71, a vertical column 72, and a second horizontal plate 73. A second rotating shaft 81 is fixedly connected to the lower surface of the first horizontal plate 71, the vertical column 72 is fixedly connected to the upper surface of the first horizontal plate 71, and the second horizontal plate 73 is fixedly connected to the upper end of the vertical column 72. When clamping and positioning the workpiece 10, the end of the second horizontal plate 73 away from the vertical column 72 is positioned above the workpiece 10. A clamping column 74 is fixedly connected to the lower surface of the end of the second horizontal plate 73 away from the vertical column 72. The lower end of the clamping column 74 has a first guide chamfer around its circumference. The clamping column 74 is used to limit the upper surface of the workpiece 10. The workpiece 10 is clamped by the clamping column 74, and guided by the first guide chamfer, facilitating the movement of the clamping column 74 to the upper surface of the workpiece 10.

[0035] Specifically, the mounting base 1 has a third mounting cavity 12. One end of the first rotating shaft 6 extends into the third mounting cavity 12 and is fixedly connected to a first bevel gear 65. A vertically arranged third rotating shaft 9 is rotatably connected to the mounting base 1. The lower end of the third rotating shaft 9 extends into the third mounting cavity 12 and is fixedly connected to a second bevel gear 91. The second bevel gear 91 meshes with the first bevel gear 65 to form a gear transmission. The upper end of the third rotating shaft 9 extends outside the mounting base 1 and is fixedly connected to a rotating wheel 92. By rotating the rotating wheel 92, the third rotating shaft 9 is driven to rotate, which in turn drives the first rotating shaft 6 to rotate through the gear transmission, thereby achieving clamping and positioning of the workpiece 10. An arc-shaped groove 921 is formed on the outer edge of the rotating wheel 92, making it easy to hold the rotating wheel 92 to drive the third rotating shaft 9 to rotate. By rotating the rotating wheel 92, the rotating ring 2 can be driven to rotate and clamp the workpiece. At the same time, the guide frame 7 is driven to rotate and abut against the upper end of the workpiece 10 to block the workpiece 10. Multi-directional positioning and clamping can be achieved by operating only one component, which is simple to operate.

[0036] Specifically, the mounting base 1 includes a cover plate 13, which covers the rotating ring 2. A placement hole is formed in the center of the cover plate 13, the diameter of which is larger than the outer diameter of the workpiece 10. The placement hole is coaxially arranged with the stepped hole. By setting the cover plate 13 to cover the rotating ring 2, operational safety is improved; the workpiece 10 is placed from the placement hole onto the stepped hole, thus facilitating placement. A second guide chamfer is provided at the upper opening of the placement hole. This facilitates the placement of the workpiece 10 by guiding it along the second guide chamfer into the lower stepped hole.

[0037] The parts not covered in this technical solution can be implemented using existing technologies.

[0038] The foregoing has shown and described the basic principles, main features, and characteristics of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention includes the appended claims and their equivalents.

Claims

1. A workpiece positioning mechanism for a broaching machine tool, characterized in that: The device includes a mounting base (1) and a rotating ring (2) disposed in the mounting base (1). The mounting base (1) has a stepped hole for placing the workpiece (10). The rotating ring (2) is rotatably connected to the mounting base (1) and is coaxially arranged with the stepped hole. The mounting base (1) is provided with no less than three sets of clamping mechanisms (3) arranged circumferentially along the axis of the stepped hole. The clamping mechanism (3) includes a clamping rod (31) and a support rod (32) disposed in the mounting base (1). The mounting base (1) has a number of first mounting grooves (4) corresponding to the number of clamping mechanisms (3) around the stepped hole. The first mounting grooves (4) are all hinged to each other. A clamping rod (31) is attached, and a support rod (32) is hinged to the upper end of the rotating ring (2). The end of the support rod (32) away from the rotating ring (2) is hinged to the clamping rod (31). When the workpiece (10) is clamped and positioned, the rotating ring (2) rotates and drives the support rod (32) to push the clamping rod (31) towards the workpiece (10), so that the ends of multiple clamping rods (31) away from the first mounting groove (4) are simultaneously clamped on the outer ring side wall of the workpiece (10). When the workpiece (10) is taken out, the rotating ring (2) drives multiple clamping rods (31) to rotate into the first mounting groove (4) at the same time to move away from the workpiece (10) and release the clamping state of the workpiece (10). The mounting base (1) has a second mounting cavity (5) on one side. A first rotating shaft (6) arranged perpendicular to the stepped hole is rotatably connected in the second mounting cavity (5). A worm (61) with helical teeth is provided on the first rotating shaft (6). The outer wall of the rotating ring (2) is provided with meshing teeth to form a worm wheel. The worm (61) meshes with the worm wheel on the outer wall of the rotating ring to form a worm wheel and worm gear transmission. The first rotating shaft (6) has a threaded rod section (62) on its shaft body. The threaded rod section (62) is connected to a movable nut (63) by a threaded engagement. The upper end face of the mounting base (1) has a sliding groove (11) that communicates with the second mounting cavity (5). The sliding groove (11) is parallel to the first rotating shaft (6). A sliding pin (64) is fixedly connected to the movable nut (63). The sliding pin (64) passes through the sliding groove (11) and extends to the upper end face of the mounting base (1). The upper end of the mounting base (1) is provided with a baffle (7) for blocking the upper end face of the workpiece (10). The baffle (7) is located on the side of the sliding groove (11) closer to the workpiece (10). The baffle (7) is rotatably connected to the mounting base (1) by a second rotating shaft (81). A fixed column (82) is installed on the frame (7). The fixed column (82) is located on the side of the second rotating shaft (81) away from the sliding pin (64). A tension spring (83) is connected between the fixed column (82) and the sliding pin (64). When the workpiece (10) is clamped and positioned, the first rotating shaft (6) drives the sliding pin (64) on the moving nut (63) to move. The tension spring (83) moves to the side of the second rotating shaft (81) and pulls the baffle (7) to rotate and abut against the upper end of the workpiece (10) to block the workpiece (10). When the workpiece (10) is taken out, the first rotating shaft (6) drives the sliding pin (64) on the moving nut (63) to move in the opposite direction. The tension spring (83) moves to the other side of the second rotating shaft (81) so that the baffle (7) rotates to the other side and gets away from blocking the workpiece (10).

2. The workpiece positioning mechanism for a broaching machine tool according to claim 1, characterized in that: The mounting base (1) is fixedly connected with a first limiting post (84) and a second limiting post (85), which are located on both sides of the baffle (7).

3. A workpiece positioning mechanism for a broaching machine tool according to claim 1 or 2, characterized in that: The baffle (7) includes a first horizontal plate (71), a vertical column (72), and a second horizontal plate (73). The second rotating shaft (81) is fixedly connected to the lower surface of the first horizontal plate (71), the vertical column (72) is fixedly connected to the upper surface of the first horizontal plate (71), and the second horizontal plate (73) is fixedly connected to the upper end of the vertical column (72). When clamping and positioning the workpiece (10), the end of the second horizontal plate (73) away from the vertical column (72) is located above the workpiece (10).

4. The workpiece positioning mechanism for a broaching machine tool according to claim 3, characterized in that: A clamping column (74) is fixedly connected to the lower surface of the second horizontal plate (73) away from the vertical column (72). The lower end of the clamping column (74) is provided with a first guide chamfer. The clamping column (74) is used to limit the upper surface of the workpiece (10).

5. The workpiece positioning mechanism for a broaching machine tool according to claim 1, characterized in that: The mounting base (1) has a third mounting cavity (12). One end of the first rotating shaft (6) extends into the third mounting cavity (12) and is fixedly connected to a first bevel gear (65). The mounting base (1) is rotatably connected to a vertically arranged third rotating shaft (9). The lower end of the third rotating shaft (9) extends into the third mounting cavity (12) and is fixedly connected to a second bevel gear (91). The second bevel gear (91) meshes with the first bevel gear (65) to form a gear transmission. The upper end of the third rotating shaft (9) extends to the outside of the mounting base (1) and is fixedly connected to a rotating wheel (92).

6. The workpiece positioning mechanism for a broaching machine tool according to claim 5, characterized in that: The outer edge of the rotating wheel (92) is provided with an arc-shaped groove (921).

7. The workpiece positioning mechanism for a broaching machine tool according to claim 1, characterized in that: The mounting base (1) includes a cover plate (13) which covers the top of the rotating ring (2). A placement hole is provided in the middle of the cover plate (13). The diameter of the placement hole is larger than the outer diameter of the workpiece (10). The placement hole is coaxially arranged with the stepped hole.

8. The workpiece positioning mechanism for a broaching machine tool according to claim 7, characterized in that: The upper opening of the placement hole is provided with a second guide chamfer.

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