Seven-axis linkage device for numerical control broach grinding machine

Abstract

The invention relates to the technical field of broach grinding machines, in particular to a seven-axis linkage device for a numerical control broach grinding machine, a supporting seat body is further arranged on a control rail, and the supporting seat body is positioned through an arranged regulation and control positioning assembly; the auxiliary mechanism is used for conducting auxiliary supporting on the broach workpiece. Limiting is carried out through matched use of the driving tip and the rotating tip, and on the basis of limiting, flexible support is provided for a broach workpiece through matched use of the arranged supporting seat body and the auxiliary mechanism, so that the influence caused by vibration in the machining process is avoided; when the broach workpiece is rotated, the broach teeth of the broach workpiece are prevented from being scratched and damaged; the method is achieved through cooperative use of the arranged auxiliary roller and the flexible assembly. Besides, a positioning effect is provided for the supporting seat body through the arranged regulating and positioning assembly, the supporting seat body is slidably adjusted on the control rail according to actual machining requirements, and after the supporting seat body is adjusted to a proper position, the position of the supporting seat body is positioned.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of broach grinder, and particularly relates to a seven-axis linkage device for numerical control broach grinder. BACKGROUND

[0002] The seven-axis numerical control broach grinder is an advanced device specially used for high-precision broach manufacturing and grinding, and its core functions include precise grinding of the front blade surface, the clearance angle and the tooth back, and is widely applied to the precise tool machining field of automobile gearbox, engine cylinder and the like; a typical seven-axis linkage system comprises X / Y / Z linear axes, A / C rotary axes and U / V / W additional axes, and precise grinding of complex geometric surfaces such as spiral grooves and special-shaped blade edges is realized through the compound movement of the tool and the workpiece.

[0003] The Chinese authorized patent document with the publication number CN217966188U discloses a numerical control broach front blade grinder, and the scheme discloses in the specification that "the main shaft box 2 and the tailstock 3 are both fixed on the base 8, the main shaft box 2 comprises a driving top pin extending left and right along the axis, and the tailstock 3 comprises a rotary top pin arranged opposite to the driving top pin. When in use, the broach 13 workpiece is clamped between the rotary top pin and the driving top pin, and the driving top pin provides power to drive the broach 13 workpiece to rotate", and "the spring 10 is installed as follows: the lower end of the guide column 9b is inserted into the upper end of the pressure pipe 12, the spring 10 is in the pressure pipe 12, and the two ends of the spring 10 are respectively pressed on the T-shaped bolt 11 and the guide column 9b. The spring 10 is hidden in the pressure pipe 12, which can effectively avoid external interference during the operation of the spring 10, ensure the operation precision and stability of the spring 10, and stably realize the purpose of improving the machining precision".

[0004] In the above scheme, when the broach workpiece is supported, the broach workpiece is rotated through the cooperation of the driving top pin and the rotary top pin, that is, during the rotation of the broach, on the one hand, the broach teeth may scratch and damage the support groove on the support block, which may affect the close contact between the support block and the broach workpiece, and may have a negative impact on the damping and supporting effect; similarly, the side wall of the support groove on the support block may also scratch and damage the teeth on the broach in contact with the side wall, which may also have a negative impact on the broach machining quality; the driving top pin and the rotary top pin are both positionally controlled through the control of the slide rail; the base in the above scheme is arranged on the slide rail and is positioned through the T-shaped bolt, which is not only inconvenient to position, but also inconvenient to adjust and operate.

[0005] Therefore, the present application provides a seven-axis linkage device for numerical control broach grinder to solve the above problems. SUMMARY

[0006] The present application aims to provide a seven-axis linkage device for numerical control broach grinder to solve the problems in the background.

[0007] In order to achieve the above object, the present application provides the following technical scheme: a seven-axis linkage device for numerical control broach grinder, comprising a bed body workbench and a control rail arranged on the bed body workbench, a driving center and a rotating center are arranged on the control rail; the driving center and the rotating center are used in cooperation to support and position the broach workpiece; A support seat body is further arranged on the control rail, and the support seat body is positioned by a positioning assembly arranged; A bearing groove body is arranged on the top of the support seat body, and loading grooves are arranged on both sides of the bearing groove body; An auxiliary mechanism is further arranged in the bearing groove body, and the auxiliary mechanism is used for auxiliary supporting the broach workpiece.

[0008] Preferably, the positioning assembly comprises a connecting rod fixedly arranged on one side of the support seat body, and a movable collar is fixedly arranged at the other end of the connecting rod; The movable collar is movably sleeved on a support rod body, the support rod body is arranged through the fixed plate, and the support rod body is positioned by a fastening nut.

[0009] Preferably, a limiting sliding groove is arranged on the outer side wall of the support rod body and along the axis direction, and a limiting sliding block is further arranged on the inner side wall of the movable collar; The limiting sliding block and the limiting sliding groove are used in cooperation to limit the sliding of the movable collar.

[0010] Preferably, the positioning of the movable collar is realized by a positioning structure, the positioning structure comprises positioning clamping grooves arranged at equal intervals in the limiting sliding groove, the positioning clamping grooves are arranged at equal intervals in a straight line, and the slot of the positioning clamping groove is circular; The positioning structure further comprises a positioning screw arranged in the movable collar in threaded connection, the positioning screw extends into the limiting sliding block, and the positioning screw is matched and connected with the positioning clamping groove.

[0011] Preferably, the auxiliary mechanism comprises an auxiliary roller, the auxiliary roller is arranged at equal intervals in the bearing groove body, and is arranged in an arc shape; The auxiliary roller and the support block are movably arranged through a connecting pin shaft.

[0012] Preferably, a containing ring groove is arranged at equal intervals on the outer side surface of the auxiliary roller, and the containing ring groove is used for containing the teeth of the broach; An auxiliary inclined surface is arranged on the slot edge side of the containing ring groove, an auxiliary ball is movably embedded on the auxiliary inclined surface, and the auxiliary ball is arranged in a ring shape at equal intervals.

[0013] Preferably, the support block is connected with a flexible assembly; The flexible assembly provides a flexible supporting effect for the auxiliary roller.

[0014] Preferably, the flexible assembly comprises a support rod connected with the support block, an auxiliary spring is fixedly arranged at the bottom end of the support rod, a connecting block is fixedly arranged at the other end of the auxiliary spring, and a positioning screw groove is arranged at the bottom end of the connecting block; The support rod is movably inserted into the limiting cylinder, and the limiting cylinder is used for limiting the movement of the support rod.

[0015] Preferably, the top end of the limiting cylinder is opened, the other end is closed, and the closed end of the limiting cylinder is provided with a through hole; The through hole corresponds to the position of the positioning screw groove at the bottom end of the connecting block, and the connecting block is fixed by a fastening screw.

[0016] Preferably, a mounting clamping plate is fixedly arranged at one side of the bottom end of the limiting cylinder, and the mounting clamping plate is used for mounting the limiting cylinder. The mounting clamping plate is matched with the loading groove on the side of the support seat, and is fixed by a mounting screw.

[0017] Compared with the prior art, the beneficial effects of the present application are: The seven-axis linkage device for the numerical control broach grinder comprises a bed body workbench and a control track arranged on the bed body workbench, a driving center and a rotating center are arranged on the control track; the driving center and the rotating center are used in cooperation to support and position the broach workpiece; wherein a support seat is further arranged on the control track, and the support seat is positioned by a positioning assembly; a bearing groove body is arranged on the top of the support seat, and loading grooves are arranged on both sides of the bearing groove body; an auxiliary mechanism is further arranged in the bearing groove body, and the auxiliary mechanism is used for auxiliary supporting the broach workpiece.

[0018] During the machining of the broach workpiece, the driving center and the rotating center are used in cooperation to limit, and on the basis of the limitation, the support seat and the auxiliary mechanism are used in cooperation to provide a flexible support for the broach workpiece, so as to avoid the influence caused by vibration during machining; On this basis, when the broach workpiece is rotated, the teeth of the broach workpiece are prevented from being scratched and damaged; that is, the cooperation of the auxiliary roller and the flexible assembly is mainly used to achieve this; the movable auxiliary roller can reduce the friction on the broach workpiece, and the use of the support rod and the auxiliary spring can provide a damping and buffering effect for the support of the broach workpiece; in addition, the positioning assembly provides a positioning effect for the support seat, and the support seat is adjusted on the control track according to actual machining requirements, and after being adjusted to a suitable position, the support seat is positioned, which is convenient to operate. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a seven-axis linkage device structure connection schematic diagram for the numerical control broach grinder of the application; Figure 2 It is Figure 1 It is a structure connection enlarged schematic diagram at A in the middle; Figure 3 It is a support seat body structure connection schematic diagram; Figure 4 It is a local structure connection schematic diagram of the regulating and positioning assembly; Figure 5 It is Figure 4 It is a structure connection enlarged schematic diagram at B in the middle; Figure 6 It is an auxiliary mechanism structure connection exploded view; Figure 7 It is Figure 6 It is a structure connection enlarged schematic diagram at C in the middle; Figure 8 It is an auxiliary mechanism structure connection exploded view; Figure 9 It is Figure 8 It is a structure connection enlarged schematic diagram at D in the middle; Figure 10 It is Figure 8 It is a structure connection enlarged schematic diagram at E in the middle.

[0020] In the figure: bed body workbench 1, control track 2, driving top 3, rotating top 4, broach workpiece 5, support seat body 6, bearing groove body 61, loading groove 62, connecting rod 701, movable collar 702, limiting sliding block 703, support rod body 704, limiting sliding groove 705, fixed plate 706, fastening nut 707, positioning clamping groove 708, positioning screw 709, auxiliary roller 801, containing ring groove 802, auxiliary inclined plane 803, auxiliary ball 804, support round block 805, connecting pin shaft 806, support rod 901, auxiliary spring 902, connecting block body 903, positioning screw groove 904, limiting cylinder body 905, through round hole 906, fastening screw 907, mounting clamping plate 908, mounting screw 909. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the application will be described clearly and completely below. All other embodiments obtained by the person skilled in the art without creative labor on the basis of the embodiments in the application belong to the protection scope of the application.

[0022] Embodiment one: please refer to Figures 1-10The utility model provides a seven -axis linkage device for numerical control broach grinder, including bed body workstation 1 and setting up control track 2 on bed body workstation 1, setting up driving centre 3 and rotary centre 4 on control track 2, the driving centre 3 and rotary centre 4 both use cooperation to support and position broach work piece 5, Wherein also setting up support seat body 6 on control track 2, support seat body 6 is positioned through the setting control and positioning assembly, Setting up bearing recess body 61 on the top of support seat body 6, and setting up loading groove 62 on both sides of bearing recess body 61, also setting up auxiliary mechanism in bearing recess body 61, and the auxiliary mechanism is used to assist supporting broach work piece 5.

[0023] According to the Figures 1-4 It can be known that, during the machining of the broach workpiece 5, the driving center 3 and the rotary center 4 are used in cooperation to limit, and on the basis of limiting, the support seat body 6 and the auxiliary mechanism are used in cooperation to provide a flexible support for the broach workpiece 5, so as to avoid the influence caused by vibration during machining, and avoid scratching damage to the teeth of the broach workpiece 5 when rotating the broach workpiece 5. That is, the cooperation of the auxiliary roller 801 and the flexible assembly is realized. In addition, the control and positioning assembly provides a positioning effect for the support seat body 6. According to the actual machining requirement, the support seat body 6 is adjusted on the control track 2, and after being adjusted to the appropriate position, the support seat body 6 is positioned, which is convenient to operate.

[0024] From the attached Figure 4 It can be known that, the control and positioning assembly includes a connecting rod 701 fixedly arranged on one side of the support seat body 6, and an active collar 702 fixedly arranged at the other end of the connecting rod 701. The active collar 702 is movably sleeved on a support rod body 704, the support rod body 704 is penetratingly arranged in a fixed plate 706, and the support rod body 704 is positioned by a fastening nut 707. A limiting sliding groove 705 is arranged on the outer side wall of the support rod body 704 along the axis direction, and a limiting sliding block 703 is arranged on the inner side wall of the active collar 702. The cooperation of the limiting sliding block 703 and the limiting sliding groove 705 provides a limiting action for the sliding of the active collar 702. That is, when the position of the support seat body 6 needs to be controlled, it can be adjusted by directly sliding on the control track 2. At the same time, the support seat body 6 drives the connecting rod 701 to move, and in turn drives the active collar 702 at one end of the connecting rod 701 to slide on the support rod body 704.

[0025] When the support seat 6 is adjusted to the appropriate position, the position of the support seat 6 needs to be positioned, and at this time the movable collar 702 is positioned, and in this process, the positioning of the movable collar 702 is realized by the positioning structure, which comprises the positioning clamping groove 708 equidistantly arranged in the limiting sliding groove 705, the positioning clamping groove 708 is equidistantly arranged in a straight line, and the slot of the positioning clamping groove 708 is circular; The positioning structure further comprises a positioning screw 709 arranged in the movable collar 702 in a threaded manner, the positioning screw 709 extends into the limiting sliding block 703, and the positioning screw 709 is matched and connected with the positioning clamping groove 708; That is, after the position of the support seat 6 is adjusted, the positioning screw 709 is tightened, so that one end of the positioning screw 709 is clamped into the positioning clamping groove 708 in the corresponding position of the limiting sliding groove 705, and the position of the movable collar 702 is positioned, that is, the position of the support seat 6 is positioned, and the operation is convenient.

[0026] The use of the support seat 6 can be changed in number according to the actual machining support requirements of the broach workpiece 5. When the use of the support seat 6 needs to be increased, the fixing nut 707 needs to be first removed from the support rod body 704, that is, the fixing nut 707 is first rotated and then disassembled, and then one end of the support rod body 704 is pulled to separate the other end of the support rod body 704 from the fixed plate 706. When the support rod body 704 reaches the appropriate position, the support seat 6 to be added is placed on the control rail 2, and the added support seat 6 is aligned with the installed support seat 6. At the same time, the movable collar 702 at one end of the connecting rod 701 of the added support seat 6 is aligned with the movable collar 702 at one end of the connecting rod 701 of the installed support seat 6. Then, one end of the support rod body 704 is pushed, and the other end of the support rod body 704 passes through the movable collar 702 at one end of the connecting rod 701 of the added support seat 6, and finally passes through the fixed plate 706. The two ends of the support rod body 704 are fastened by the fixing nut 707, and the installation of the support seat 6 is completed.

[0027] According to the accompanying Figure 2 and the accompanying Figures 8-10As shown, it can be known that the auxiliary mechanism comprises auxiliary rollers 801 which are equidistantly arranged in the bearing recess body 61 and arranged in an arc shape; the auxiliary rollers 801 are movably arranged with the supporting round blocks 805 through connecting pin shafts 806; the supporting round blocks 805 are connected with flexible assemblies; the flexible assemblies provide a flexible supporting effect for the auxiliary rollers 801; the flexible assemblies comprise supporting rods 901 connected with the supporting round blocks 805, auxiliary springs 902 are fixedly arranged at the bottom ends of the supporting rods 901, connecting block bodies 903 are fixedly arranged at the other ends of the auxiliary springs 902, and positioning screw grooves 904 are arranged at the bottom ends of the connecting block bodies 903; that is, the multiple groups of auxiliary rollers 801 equidistantly arranged in an arc shape in the bearing recess body 61 on the top of the supporting seat body 6 provide auxiliary support for the broach workpiece 5, the movably arranged auxiliary rollers 801 can reduce the friction of the broach workpiece 5, and in this process, the use of the supporting rods 901 and the auxiliary springs 902 can also provide a damping and buffering effect for the support of the broach workpiece 5.

[0028] Regarding the installation of the auxiliary roller 801, in this design, the support rod 901 is movably inserted into the limiting cylinder 905, which provides a limiting function for the movement of the support rod 901. The top of the limiting cylinder 905 is open, and the other end is sealed, with a through hole 906 at the sealed end. This through hole 906 corresponds to the positioning screw groove 904 at the bottom of the connecting block 903. The device is fixed by fastening screws 907; a mounting plate 908 is fixedly installed on one side of the bottom end of the limiting cylinder 905, which is used for installing the limiting cylinder 905; the mounting plate 908 is adapted to and engaged with the loading groove 62 on the side of the support base 6, and is fixed by the mounting screws 909; that is, firstly, the two ends of the auxiliary roller 801 are connected to the support block 805, that is, the movable connection is made by the connecting pin 806, and then the support rod 901 is inserted into the limiting cylinder 905. In the cylinder 905, until the connecting block 903 at the bottom of the auxiliary spring 902 reaches the sealing part at the bottom of the limiting cylinder 905, the positioning screw groove 904 at the bottom of the connecting block 903 aligns with the through hole 906 at the sealing part at the bottom of the limiting cylinder 905. Then, the fastening screw 907 is inserted into the through hole 906, and then the fastening screw 907 is threaded into the positioning screw groove 904. After tightening the fastening screw 907, the connecting block 903 and... The connection of the limiting cylinder 905 is now complete. At this point, the auxiliary spring 902 will be in the limiting cylinder 905, and the support rod 901 will be inserted into the limiting cylinder 905. Finally, the mounting plate 908 will be engaged with the loading groove 62 on the support base 6. After engagement, the mounting plate 908 will be fixed with the mounting screws 909. At this point, the installation of one set of auxiliary rollers 801 is complete. Then, the remaining auxiliary rollers 801 can be installed following the same steps.

[0029] Combined with the appendix Figures 6-7 As shown, when the auxiliary roller 801 provides auxiliary support for the broaching workpiece 5, the cutting teeth on the broaching workpiece 5 will contact the outer cylindrical surface of the auxiliary roller 801. When the broaching workpiece 5 is rotated by the cooperation of the drive center 3 and the rotating center 4, the cutting teeth on the outer side of the broaching workpiece 5 may damage the outer cylindrical surface of the auxiliary roller 801. With prolonged use, this will accelerate the wear of the auxiliary roller 801, thereby reducing the auxiliary support effect of the auxiliary roller 801 on the broaching workpiece 5.

[0030] Therefore, the present scheme is used for the design of the auxiliary roller 801, and the accommodating ring groove 802 is arranged equidistantly on the outer side of the auxiliary roller 801, which is used for accommodating the teeth of the broach; and the auxiliary inclined surface 803 is arranged on the edge side of the accommodating ring groove 802, and the auxiliary ball 804 is movably embedded on the auxiliary inclined surface 803, and the auxiliary ball 804 is arranged equidistantly in a ring shape.

[0031] Therefore, the present scheme is used for the design of the auxiliary roller 801, and the accommodating ring groove 802 is arranged equidistantly on the outer side of the auxiliary roller 801, which is used for accommodating the teeth of the broach; and the auxiliary inclined surface 803 is arranged on the edge side of the accommodating ring groove 802, and the auxiliary ball 804 is movably embedded on the auxiliary inclined surface 803, and the auxiliary ball 804 is arranged equidistantly in a ring shape.

[0032] In addition, the auxiliary roller 801 is used for the design of the auxiliary roller 801, and the accommodating ring groove 802 is arranged equidistantly on the outer side of the auxiliary roller 801, which is used for accommodating the teeth of the broach; and the auxiliary inclined surface 803 is arranged on the edge side of the accommodating ring groove 802, and the auxiliary ball 804 is movably embedded on the auxiliary inclined surface 803, and the auxiliary ball 804 is arranged equidistantly in a ring shape. Figures 2-3As shown, the auxiliary mechanism designed in the scheme is mainly a plurality of auxiliary rollers 801 arranged in an arc shape at equal intervals in the bearing groove body 61 on the top of the support seat body 6, each auxiliary roller 801 has a separate flexible assembly, that is, each auxiliary roller 801 is connected with a flexible assembly; in this way, when subsequent replacement work is needed, the local auxiliary roller 801 and the flexible assembly can be replaced, when a certain auxiliary roller 801 needs to be replaced, first, the flexible assembly connected with the auxiliary roller 801 needs to be disassembled, that is, first, the fixing of the mounting screw 909 to the mounting clamping plate 908 is released, that is, the clamping and fixing of the mounting clamping plate 908 and the loading groove 62 can be released, then the auxiliary roller 801 can be pulled up until it is separated from the bearing groove body 61, then the connection between the auxiliary roller 801 and the support round block 805 is released, that is, the connecting pin shaft 806 for connecting the auxiliary roller 801 and the support round block 805 is extracted, the disassembly work of the auxiliary roller 801 can be completed, a new auxiliary roller 801 is replaced and installed, and finally the mounting clamping plate 908 is clamped in the loading groove 62 and fixed by the mounting screw 909. If the auxiliary spring 902 needs to be disassembled and replaced during this process, the fixed connection between the connecting block body 903 and the limiting cylinder body 905 needs to be released, that is, the fastening screw 907 for connecting the connecting block body 903 and the limiting cylinder body 905 is disassembled, the connecting block body 903 and the limiting cylinder body 905 are connected and contacted, the support rod 901 is extracted from the limiting cylinder body 905, and the auxiliary spring 902 can be extracted and disassembled, which is convenient to operate; then a new auxiliary spring 902 can be installed.

[0033] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A seven-axis linkage device for a CNC broach grinding machine, comprising a bed worktable (1) and a control rail (2) disposed on the bed worktable (1), wherein a drive center (3) and a rotary center (4) are disposed on the control rail (2); the drive center (3) and the rotary center (4) are used together to support and position the broach workpiece (5); Its features are: A support base (6) is also provided on the control track (2), and the support base (6) is positioned by the provided adjustment and positioning components; A bearing groove (61) is provided on the top of the support base (6), and loading grooves (62) are provided on both sides of the bearing groove (61). An auxiliary mechanism is also provided in the bearing groove (61) for providing auxiliary support for the broach workpiece (5).

2. The seven-axis linkage device for a CNC broach grinding machine according to claim 1, characterized in that: The control and positioning component includes a connecting rod (701) fixedly disposed on one side of the support body (6), and a movable collar (702) fixedly disposed at the other end of the connecting rod (701). The movable collar (702) is movably mounted on the support rod (704), which is inserted through the fixed plate (706) and positioned by a fastening nut (707).

3. The seven-axis linkage device for a CNC broach grinding machine according to claim 2, characterized in that: A limiting groove (705) is provided on the outer side wall of the support rod (704) along the axial direction, and a limiting slider (703) is also provided on the inner side wall of the movable collar (702). The combination of the limiting slider (703) and the limiting groove (705) provides a limiting effect for the sliding of the movable collar (702).

4. A seven-axis linkage device for a CNC broach grinding machine according to claim 3, characterized in that: The positioning of the movable collar (702) is achieved by a positioning structure, which includes positioning slots (708) equidistantly arranged in the limiting slide groove (705). The positioning slots (708) are equidistantly arranged in a straight line, and the opening of the positioning slots (708) is circular. The positioning structure also includes a positioning screw (709) with a threaded connection in the movable collar (702), which extends into the limiting slider (703) and is adapted to engage with the positioning slot (708).

5. A seven-axis linkage device for a CNC broach grinding machine according to claim 1, characterized in that: The auxiliary mechanism includes an auxiliary roller (801), which is equally spaced in the bearing groove (61) and is arc-shaped. The auxiliary roller (801) and the support block (805) are movably set by a connecting pin (806).

6. A seven-axis linkage device for a CNC broach grinding machine according to claim 5, characterized in that: A receiving annular grooves (802) are provided at equal intervals on the outer cylindrical surface of the auxiliary roller (801). These receiving annular grooves (802) are used to accommodate the cutting teeth of the broach. Furthermore, an auxiliary inclined surface (803) is provided on the side of the groove opening of the receiving annular groove (802), and auxiliary balls (804) are movably embedded on the auxiliary inclined surface (803), and the auxiliary balls (804) are arranged in a ring at equal intervals.

7. A seven-axis linkage device for a CNC broach grinding machine according to claim 5, characterized in that: The support block (805) is connected to the flexible component; The flexible component provides a flexible support effect for the auxiliary roller (801).

8. A seven-axis linkage device for a CNC broach grinding machine according to claim 7, characterized in that: The flexible component includes a support rod (901) connected to the support block (805), an auxiliary spring (902) is fixedly provided at the bottom end of the support rod (901), a connecting block (903) is fixedly provided at the other end of the auxiliary spring (902), and a positioning screw groove (904) is provided at the bottom end of the connecting block (903). The support rod (901) is movably inserted into the limiting cylinder (905), which is used to limit the movement of the support rod (901).

9. A seven-axis linkage device for a CNC broach grinding machine according to claim 8, characterized in that: The top end of the limiting cylinder (905) is open and the other end is sealed, and the sealed end of the limiting cylinder (905) is provided with a through hole (906). The through hole (906) is positioned corresponding to the positioning screw groove (904) at the bottom of the connecting block (903), and the connecting block (903) is fixed by fastening screws (907).

10. A seven-axis linkage device for a CNC broach grinding machine according to claim 8, characterized in that: A mounting plate (908) is fixedly provided on one side of the bottom end of the limiting cylinder (905), and the mounting plate (908) is used for the installation of the limiting cylinder (905); The mounting plate (908) is adapted to and snapped into the loading groove (62) on the side of the support body (6), and is fixed by the mounting screws (909).

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