A pull rod assembly, a shaft core assembly and an electric spindle

Abstract

The present invention provides a pull rod assembly, a shaft core assembly, and an electric spindle, belonging to the field of electric spindles. The pull rod assembly comprises: a pull rod, comprising a pull rod front end and a pull rod end, the pull rod end being provided with a swivel connecting rod mounting hole and an induction disc mounting hole; a swivel connecting rod, comprising a rod body and a front end connector, the front end connector being inserted into the swivel connecting rod mounting hole, the front end connector having a diameter greater than the diameter of the rod body and a length greater than the depth of the swivel connecting rod mounting hole, so that the front end connector at least partially protrudes outside the swivel connecting rod mounting hole; an induction disc, comprising a first mounting hole and a second mounting hole; and a first fastener, the first fastener being used to fasten the induction disc mounted on the swivel connecting rod to the pull rod end and to press the induction disc against the front end connector of the swivel connecting rod; wherein adjusting the locking force of the first fastener on the induction disc can adjust the axial positioning accuracy of the swivel connecting rod.

Description

Technical Field

[0001] The present invention relates to the technical field of electric spindles, and in particular to a pull rod assembly, a shaft core assembly and an electric spindle. Background Art

[0002] The electric spindle is a new technology in the field of CNC machine tools that combines a drive motor and a rotating spindle. With the continuous development of technology, the performance requirements for electric spindles are becoming increasingly higher. Electric spindles with high precision, high speed, high rigidity, and high torque have emerged. In particular, the design of a drawbar mechanism with a central water outlet effectively solves the drawbacks of traditional cooling methods by directly cooling the spindle core and cutting tool holder, reducing thermal expansion of the spindle core.

[0003] The pull rod assembly with central water outlet adds a swivel connecting rod. If the end of the swivel connecting rod has a large runout, it will seriously affect the vibration of the rear end of the main shaft, thereby affecting the stability of the main shaft. Summary of the Invention

[0004] In order to overcome the problem in the related art that when the electric spindle rotates, the end of the rotary connecting rod vibrates greatly, seriously affecting the vibration of the rear end of the spindle, and thus affecting the stability of the spindle, the embodiment of the present invention proposes a pull rod assembly, a shaft core assembly and an electric spindle, which realizes the adjustment of the accuracy of the end of the rotary connecting rod through the cooperation of the induction disk, the pull rod and the rotary connecting rod; the rotary connecting rod is installed to the pull rod, and the rotary connecting rod can be tightened by the end face of the induction disk. At the same time, the accuracy of the end of the rotary connecting rod is adjusted by adjusting the locking force of the first fastener on the induction disk, thereby reducing the vibration of the rear end of the spindle.

[0005] A first aspect of an embodiment of the present invention provides a pull rod assembly for being installed in an electric spindle to implement tool broaching and tool loosening operations of the electric spindle. The pull rod assembly includes:

[0006] The pull rod includes a pull rod front end for connecting to the electric spindle claw head and a pull rod end opposite to the pull rod front end, and an end surface of the pull rod end is provided with a rotary connecting rod mounting hole and a plurality of induction disk mounting holes arranged outside the rotary connecting rod mounting hole;

[0007] The rotary connecting rod comprises a rod body and a front end connector and an end connector provided at both ends of the rod body in the length direction. The front end connector is inserted into the rotary connecting rod mounting hole. The end connector is used to connect to the rotary joint of the electric spindle. The diameter of the front end connector is larger than the diameter of the rod body, and the length of the front end connector is larger than the depth of the rotary connecting rod mounting hole, so that the front end connector inserted into the rotary connecting rod mounting hole at least partially protrudes outside the rotary connecting rod mounting hole.

[0008] The induction plate has a first mounting hole formed on the induction plate, and is mounted on the rod body through the first mounting hole. The induction plate also has a plurality of second mounting holes corresponding to the induction plate mounting holes and located outside the first mounting holes.

[0009] A first fastener is provided through the second mounting hole of the induction disc and is locked in the induction disc mounting hole of the pull rod, so as to fasten the induction disc mounted on the swivel connecting rod to the end of the pull rod and press the induction disc against the front end connector of the swivel connecting rod to axially position the swivel connecting rod;

[0010] The positioning accuracy of the swivel connecting rod in the axial direction can be adjusted by adjusting the locking force of the first fastener on the induction disc.

[0011] In the above technical solution, positioning pin holes communicating with the mounting hole of the swivel connecting rod are further provided on both radial sides of the end of the pull rod, and a second fastener is locked in the positioning pin hole. The second fastener presses on the outer periphery of the front end connector of the swivel connecting rod to radially position the swivel connecting rod.

[0012] In the above technical solution, at least one annular sealing groove is provided on the outer periphery of the end connector of the swivel connecting rod, and a sealing ring is provided in the annular sealing groove;

[0013] The annular sealing ring elastically contacts the hole wall of the swivel rod mounting hole.

[0014] In the above technical solution, the plurality of induction disc mounting holes are evenly distributed in the circumferential direction outside the swivel rod mounting hole;

[0015] The first mounting hole is arranged in the middle of the induction plate, and the plurality of second mounting holes are evenly distributed in the circumferential direction outside the first mounting hole.

[0016] In the above technical solution, the length of the front end connector of the swivel rod is L1, and the depth of the swivel rod mounting hole is L2;

[0017] The difference △L between L1 and L2 satisfies: 0.015mmL≤△L≤0.02mm.

[0018] A second aspect of an embodiment of the present invention provides a shaft core assembly, which includes a shaft core and the above-mentioned pull rod assembly, wherein a portion of the pull rod assembly is disposed inside the shaft core and another portion protrudes outside the shaft core.

[0019] In the above technical solution, the shaft core assembly further includes:

[0020] An encoder spacer ring is provided with a spacer ring mounting hole in the middle thereof, the encoder spacer ring is fixedly sleeved on the shaft core through the spacer ring mounting hole and is arranged around the outer periphery of the pull rod assembly protruding from the outside of the shaft core;

[0021] The encoder spacer ring includes a first side for fixedly connecting to the shaft core and a second side opposite to the first side. The second side is provided with an anti-rotation plate mounting groove, which is a slot with an opening, wherein the anti-rotation plate mounting groove opens to the spacer ring mounting hole.

[0022] The anti-rotation plate is detachably installed in the anti-rotation plate installation groove and cooperates with the outer periphery of the pull rod assembly protruding outside the shaft core to limit the circumferential rotation of the pull rod assembly relative to the shaft core.

[0023] In the above technical solution, an anti-rotation structure is formed between the anti-rotation sheet and the outer periphery of the pull rod assembly;

[0024] The anti-rotation structure includes a first anti-rotation plane formed on the side wall of the anti-rotation plate, and a second anti-rotation plane formed on the outer periphery of the pull rod;

[0025] The first anti-rotation plane and the second anti-rotation plane cooperate together to limit the circumferential rotation of the pull rod assembly relative to the shaft core;

[0026] The second anti-rotation plane is formed with a positioning pin hole as an arc-shaped ...

[0027] A first anti-rotation plane is formed on the matching surface of the pull rod.

[0028] In the above technical solution, the tie rod mating surface further includes arcuate surfaces located on both sides of the first anti-rotation surface, and the arcuate surfaces are mated with the outer circumferential surface of the tie rod;

[0029] The anti-rotation piece is further provided with an arc-shaped notch between the first anti-rotation surface and the arc-shaped surface.

[0030] A third aspect of an embodiment of the present invention provides an electric spindle, which includes the above-mentioned shaft core assembly.

[0031] In the above technical solution, the electric spindle is a central water outlet electric spindle.

[0032] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0033] The pull rod assembly provided in an embodiment of the present invention adjusts the accuracy of the end of the swivel connecting rod through the cooperation of the induction disk, the pull rod and the swivel connecting rod; the swivel connecting rod is installed on the pull rod, and the swivel connecting rod can be pressed by the end face of the induction disk. At the same time, the accuracy of the end of the swivel connecting rod is adjusted by adjusting the locking force of the first fastener on the induction disk, thereby reducing the vibration of the rear end of the main shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0035] Figure 1 This is a schematic diagram of the exploded structure of an embodiment of a tie rod assembly of the present invention;

[0036] Figure 2 This is a schematic diagram of the main structure of the tie rod in the tie rod assembly embodiment of the present invention;

[0037] Figure 3 A schematic diagram of the three-dimensional structure of the rotary structure in the embodiment of the pull rod assembly of the present invention;

[0038] Figure 4 A schematic diagram of a partial three-dimensional structure of a tie rod in an embodiment of a tie rod assembly of the present invention;

[0039] Figure 5 Schematic diagram of the three-dimensional structure of the induction disk in the first viewing angle in an embodiment of the pull rod assembly of the present invention;

[0040] Figure 6 Schematic diagram of the three-dimensional structure of the induction disk in the pull rod assembly embodiment of the present invention at a second viewing angle;

[0041] Figure 7 Schematic diagram of the three-dimensional structure of the induction disk in the embodiment of the pull rod assembly of the present invention at a third viewing angle;

[0042] Figure 8 This is a schematic diagram of the exploded structure of an embodiment of the shaft core assembly of the present invention;

[0043] Figure 9 Schematic diagram of the three-dimensional structure of the encoder spacer ring in the embodiment of the shaft core assembly of the present invention at a first viewing angle;

[0044] Figure 10 Schematic diagram of the three-dimensional structure of the encoder spacer ring in the embodiment of the shaft core assembly of the present invention at a second viewing angle;

[0045] Figure 11 Schematic diagram of the three-dimensional structure of the encoder spacer ring in the embodiment of the shaft core assembly of the present invention from a third perspective;

[0046] Figure 12 Schematic diagram of the three-dimensional structure of the anti-rotation plate in the embodiment of the shaft core assembly of the present invention;

[0047] Figure 13 It is a schematic cross-sectional view of an embodiment of the electric spindle of the present invention;

[0048] Figure 14 for Figure 13 Schematic diagram of the enlarged structure of point A in the embodiment.

[0049] Among them: 1-pull rod; 11-swivel connecting rod mounting hole; 12-sensing disc mounting hole; 13-locating pin hole; 14-second anti-rotation plane; 2-swivel connecting rod; 21-rod body; 22-front end connector; 221-annular sealing groove; 23-end connector; 3-sensing disc; 31-first mounting hole; 32-second mounting hole; 4-first fastener; 5-second fastener; 6-shaft core; 7-encoder spacer ring; 7a-first side; 7b-second side; 71-spacer ring mounting hole; 72-anti-rotation plate mounting groove; 8-anti-rotation plate; 8a-pull rod mating surface; 8b-mounting groove mating surface; 81-first anti-rotation plane; 82-arc surface; 91-swivel joint; 92-cylinder assembly; 93-spring assembly; 94-pull rod sleeve; 95-claw seat; 96-claw plate; 97-claw head; 98-tool handle. DETAILED DESCRIPTION

[0050] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention as detailed in the appended claims.

[0051] At present, when the existing electric spindle rotates, the end of the rotary connecting rod jumps greatly, which seriously affects the vibration of the rear end of the spindle, and further affects the stability of the spindle. An embodiment of the present invention proposes a pull rod assembly, which adjusts the accuracy of the end of the rotary connecting rod through the cooperation of the induction disk, the pull rod and the rotary connecting rod; the rotary connecting rod is installed to the pull rod, and the rotary connecting rod can be tightened by the end face of the induction disk. At the same time, the accuracy of the end of the rotary connecting rod is adjusted by adjusting the locking force of the first fastener on the induction disk, thereby reducing the vibration of the rear end of the spindle.

[0052] The following is combined with Figure 1 -Attached Figure 14 The technical solution of this embodiment is described in detail. The following implementation methods and embodiments can be combined with each other unless there is any conflict.

[0053] Example

[0054] like Figures 1-14 As shown, in a first aspect of this embodiment, a pull rod assembly is provided for being installed in an electric spindle to realize the tool broaching and tool loosening operations of the electric spindle. The pull rod assembly includes:

[0055] The pull rod 1 includes a front end for connecting to the electric spindle claw head 97 and a rear end opposite to the front end. The end surface of the rear end is provided with a rotary connecting rod mounting hole 11 and a plurality of induction disc mounting holes 12 provided outside the rotary connecting rod mounting hole 11.

[0056] The swivel connecting rod 2 includes a rod body 21 and a front end connector 22 and an end connector 23 provided at both ends of the rod body 21 in the longitudinal direction. The front end connector 22 is inserted into the swivel connecting rod mounting hole 11, and the end connector 23 is used to connect to the rotary joint 91 of the electric spindle. The diameter of the front end connector 22 is larger than the diameter of the rod body 21, and the length of the front end connector 22 is larger than the depth of the swivel connecting rod mounting hole 11, so that the front end connector 22 inserted into the swivel connecting rod mounting hole 11 at least partially protrudes outside the swivel connecting rod mounting hole 11.

[0057] The induction plate 3 has a first mounting hole 31 formed therein. The induction plate 3 is mounted on the rod body 21 through the first mounting hole 31. The induction plate 3 also has a plurality of second mounting holes 32 corresponding to the induction plate mounting holes and located outside the first mounting hole 31.

[0058] The first fastener 4 is provided through the second mounting hole 32 of the induction disc 3 and is locked in the induction disc mounting hole 12 of the pull rod 1, thereby fastening the induction disc 3 mounted on the swivel connecting rod 2 to the end of the pull rod and pressing the induction disc 3 against the front end connector 22 of the swivel connecting rod 2 to axially position the swivel connecting rod 2;

[0059] The positioning accuracy of the swivel connecting rod 2 in the axial direction can be adjusted by adjusting the locking force of the first fastening member 4 on the induction disc 3 .

[0060] The pull rod assembly proposed in this embodiment adjusts the end precision of the swivel connecting rod 2 through the cooperation of the induction disk 3, the pull rod 1 and the swivel connecting rod 2; the swivel connecting rod 2 is installed on the pull rod 1, and the swivel connecting rod 2 can be pressed by the end face of the induction disk 3. At the same time, the precision of the end of the swivel connecting rod 2 can be adjusted by adjusting the locking force of the first fastener 4 on the induction disk, thereby reducing the vibration of the rear end of the main shaft.

[0061] It is worth noting that the pull rod assembly with central water outlet has an additional rotary connecting rod 2. If the end of the rotary connecting rod 2 has a large runout, it will seriously affect the vibration of the rear end of the spindle, thereby affecting the stability of the spindle. If the pull rod assembly inside the shaft core of a high-speed rotating electric spindle is not relatively fixed, the pull rod assembly and the shaft core will undergo circumferential displacement, which will cause the dynamic balance of the spindle to fail, affecting the vibration of the spindle, and further affecting the spindle life and processing accuracy.

[0062] Based on this, Figure 2 and Figure 4 As shown, in this embodiment, positioning pin holes 13 communicating with the swivel rod mounting hole 11 are provided on both radial sides of the pull rod end. The positioning pin holes 13 are locked as shown in FIG. Figure 1The second fastener 5 shown is pressed against the outer periphery of the front end connector 22 of the rotary connecting rod 2 to radially position the rotary connecting rod 2 .

[0063] That is, in the embodiment of the present invention, the swivel connecting rod 2 is pressed by the end surface of the induction disk 3, and the accuracy of the end of the swivel connecting rod 2 is adjusted by adjusting the locking force of the first fastener 4 on the induction disk, thereby reducing the vibration of the rear end of the main shaft and improving the stability and life of the main shaft; in addition, two positioning pin holes 13 are added at radially symmetrical positions at the end of the pull rod 1, and the second fastener 5 is doubly fixed to the swivel connecting rod 2 through a threaded connection, thereby ensuring the stability of the swivel connecting rod 2 under long-term operation.

[0064] Preferably, the first fastener 4 and the second fastener 5 are fastening bolts or fastening screws, and the induction disc 3 is provided with six second mounting holes.

[0065] In any of the above embodiments, Figure 3 As shown, at least one annular sealing groove 221 is provided on the outer periphery of the front end connector 22 of the swivel connecting rod 2, and a sealing ring is provided in the annular sealing groove 221;

[0066] The annular sealing ring elastically contacts the hole wall of the swivel rod mounting hole 11 .

[0067] In the embodiment of the present invention, the annular sealing ring is installed in the annular sealing groove 221 mainly to prevent leakage of the central water outlet while also having a certain vibration reduction effect.

[0068] In any of the above embodiments, Figure 4-Figure 7 As shown, the rotary connecting rod mounting hole 11 is provided in the middle of the end surface of the pull rod end, and a plurality of induction plate mounting holes 12 are evenly distributed circumferentially outside the rotary connecting rod mounting hole 11;

[0069] The first mounting hole 31 is located in the middle of the induction plate 3 , and the plurality of second mounting holes 32 are evenly distributed around the outer side of the first mounting hole 31 .

[0070] In any of the above embodiments, the length of the front end connector 22 of the swivel connecting rod 2 is L1, and the depth of the swivel connecting rod mounting hole 11 is L2;

[0071] The difference △L between L1 and L2 satisfies: 0.015mmL≤△L≤0.02mm.

[0072] like Figures 8-12 As shown, the second aspect of this embodiment provides an axis core assembly, including an axis core 6 and the above-mentioned pull rod assembly, wherein a portion of the pull rod assembly is arranged inside the axis core 6 and the other portion protrudes from the outside of the axis core 6.

[0073] Specifically, such as Figures 8-12As shown, the shaft core assembly also includes:

[0074] The encoder spacer ring 7 has a spacer ring mounting hole 71 in the middle thereof. The encoder spacer ring 7 is fixedly sleeved on the shaft core 6 through the spacer ring mounting hole 71 and is arranged around the outer periphery of the pull rod assembly protruding from the outside of the shaft core 6. Preferably, six screw holes are also provided on the outer side of the spacer ring mounting hole 71. The encoder spacer ring 7 is fixed to the shaft core 6 by installing screws in the screw holes.

[0075] The encoder spacer ring 7 includes a first side 7a for fixedly connecting to the shaft core 6 and a second side 7b opposite the first side 7a. The second side 7b is provided with an anti-rotation plate mounting groove 72. The anti-rotation plate mounting groove 72 is a slot with an opening, wherein the anti-rotation plate mounting groove 72 opens into the spacer ring mounting hole 71.

[0076] The anti-rotation plate 8 is detachably installed in the anti-rotation plate installation groove 72 and cooperates with the outer periphery of the pull rod assembly protruding from the outside of the shaft core 6 to limit the circumferential rotation of the pull rod assembly relative to the shaft core 6.

[0077] In the embodiment of the present invention, the anti-rotation plate 8 can cooperate with the outer periphery of the pull rod assembly to limit the rotation of the pull rod assembly relative to the shaft core 6, so as to realize the anti-rotation function of the pull rod assembly. At the same time, since the anti-rotation plate 8 is detachable, the pull rod 1 can be disassembled and assembled by only disassembling the anti-rotation plate 8, thereby improving the installation efficiency of the main shaft; avoiding the influence of repeated pre-tightening of the bearings on the life of the main shaft bearings when disassembling and assembling the pull rod, thereby improving the life of the main shaft bearings.

[0078] It is worth noting that under normal circumstances, the pull rod and the shaft core rotate synchronously. If no anti-rotation plate is added, the pull rod assembly and the shaft core will rotate relative to each other, which will cause the original dynamic balance of the spindle to fail and affect the vibration of the spindle.

[0079] Specifically, such as Figure 8 and Figure 12 As shown, an anti-rotation structure is formed between the anti-rotation sheet 8 and the outer periphery of the pull rod assembly;

[0080] The anti-rotation structure includes a first anti-rotation plane 81 formed on the side wall of the anti-rotation plate 8 and a second anti-rotation plane 14 formed on the outer periphery of the pull rod 1;

[0081] The first anti-rotation flat surface 81 cooperates with the second anti-rotation flat surface 14 to limit the circumferential rotation of the pull rod assembly relative to the shaft core 6;

[0082] The second anti-rotation plane 14 is formed with a positioning pin hole 13 .

[0083] More specifically, Figure 12As shown, the anti-rotation piece 8 is an arc-shaped piece as a whole, and the anti-rotation piece 8 includes a pull rod mating surface 8a that cooperates with the outer periphery of the pull rod assembly, and an installation groove mating surface 8b opposite to the pull rod mating surface 8a for mating with the wall surface of the anti-rotation piece installation groove 72;

[0084] A first anti-rotation plane 81 is formed on the pull rod mating surface 8a.

[0085] More specifically, the tie rod matching surface 8a further includes arcuate surfaces 82 located on both sides of the first anti-rotation plane 81, and the arcuate surfaces 82 match the outer circumferential surface of the tie rod 1;

[0086] The anti-rotation plate 8 also has an arcuate notch 83 between the first anti-rotation plane 81 and the arcuate surface 82. The arcuate notch 83 between the first anti-rotation plane 81 and the arcuate surface 82 acts as a tool relief groove, facilitating the machining of the first anti-rotation plane 81. Without the arcuate notch 83, the first anti-rotation plane 81 would have a machined arc after machining, which would affect the anti-rotation effect of the first anti-rotation plane 81.

[0087] That is, the encoder spacer ring 7 in the embodiment of the present invention is fixed to the shaft core 6 by 6 screws on the encoder spacer ring 7, and the symmetrically arranged anti-rotation plate 8 is installed on the encoder spacer ring 7 by two screws. Corresponding to the position of the anti-rotation plate 8, a symmetrical flat position {that is, the above-mentioned second anti-rotation plane 14} is provided at the end of the pull rod. The surface contact between the anti-rotation plate 8 and the flat position of the pull rod 1 can prevent the pull rod assembly from rotating.

[0088] When the tie rod assembly needs to be disassembled, the tie rod assembly can be removed from the shaft core by simply removing the two anti-rotation plates. There is no need to disassemble the rear bearing assembly and the encoder spacer ring that locks the inner ring of the rear bearing. This improves the efficiency of problem finding of the tie rod assembly during installation and subsequent maintenance of the tie rod assembly, and avoids bearing life problems caused by repeated disassembly or repeated pre-tightening of the rear bearing assembly.

[0089] like Figure 13 and Figure 14 As shown, an embodiment of the present invention further provides an electric spindle, which includes the above-mentioned shaft core assembly.

[0090] Specifically, the above-mentioned electric spindle is a center-discharge electric spindle, such as Figure 13 and Figure 14 As shown, the above-mentioned electric spindle also includes: a rotary joint 91, a cylinder assembly 92, a spring assembly 93, a pull rod sleeve 94, a pull claw seat 95, a pull claw plate 96, a pull claw head 97 and a tool handle 98, wherein the pull rod assembly is installed in the shaft core 6, the encoder spacer ring 7 is installed on the end face of the shaft core 6, the induction disk 3 and the rotary connecting rod 2 are installed on the end of the pull rod 1, the front end connector 22 of the rotary connecting rod 2 is connected to the pull claw head, and the rear end connector 23 is connected to the rotary joint 91.

[0091] In summary, the electric spindle provided in the embodiment of the present invention effectively solves the problem of rotation of the pull rod 1 and the additional adjustment structure of the rotary connecting rod 2 reduces the vibration of the rear end of the spindle and improves the stability of the spindle.

[0092] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow from the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0093] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A pull rod assembly, used for installation in an electric spindle to realize the broaching and loosening operations of the electric spindle, characterized in that: The pull rod assembly comprises: A pull rod (1), the pull rod (1) comprising a pull rod front end for connecting to the electric spindle claw head and a pull rod end opposite to the pull rod front end, the end surface of the pull rod end being provided with a rotary connecting rod mounting hole (11) and a plurality of induction disc mounting holes (12) arranged outside the rotary connecting rod mounting hole (11); A rotary connecting rod (2), the rotary connecting rod (2) comprising a rod body (21) and a front end connector (22) and an end connector (23) provided at both ends of the rod body (21) in a length direction, the front end connector (22) being inserted into the rotary connecting rod mounting hole (11), the end connector (23) being used to connect to a rotary joint of an electric spindle, the diameter of the front end connector (22) being greater than the diameter of the rod body (21), and the length of the front end connector (22) being greater than the depth of the rotary connecting rod mounting hole (11), so that the front end connector (22) inserted into the rotary connecting rod mounting hole (11) at least partially protrudes outside the rotary connecting rod mounting hole (11); An induction disc (3), wherein a first mounting hole (31) is formed on the induction disc (3), and the induction disc (3) is mounted on the rod body (21) through the first mounting hole (31); and the induction disc (3) is further provided with a plurality of second mounting holes (32) corresponding to the induction disc mounting holes and located outside the first mounting hole (31); A first fastener (4), the first fastener (4) is passed through the second mounting hole (32) on the induction disc (3) and is locked in the induction disc mounting hole (12) on the pull rod (1), so as to fasten the induction disc (3) mounted on the rotary connecting rod (2) to the end of the pull rod and press the induction disc (3) against the front end connector (22) of the rotary connecting rod (2), so as to axially position the rotary connecting rod (2); The axial positioning accuracy of the rotary connecting rod (2) can be adjusted by adjusting the locking force of the first fastener (4) on the induction disc (3).

2. The tie rod assembly according to claim 1, wherein: Positioning pin holes (13) communicating with the swivel connecting rod mounting hole (11) are also provided on both radial sides of the pull rod end. A second fastener (5) is locked in the positioning pin hole (13). The locking end of the second fastener (5) is arranged in the swivel connecting rod mounting hole (11) and presses against the outer periphery of the front end connector (22) of the swivel connecting rod (2) to radially position the swivel connecting rod (2).

3. The tie rod assembly according to claim 1, wherein: At least one annular sealing groove (221) is provided on the outer periphery of the front end connector (22) of the rotary connecting rod (2), and an annular sealing ring is embedded in the annular sealing groove (221); The annular sealing ring elastically abuts against the hole wall of the rotary connecting rod mounting hole (11).

4. The tie rod assembly according to claim 1, wherein: The rotary connecting rod mounting hole (11) is provided at the middle of the end surface of the pull rod end, and a plurality of the induction disk mounting holes (12) are evenly distributed in the circumferential direction outside the rotary connecting rod mounting hole (11); The first mounting hole (31) is provided in the middle of the induction disk (3), and a plurality of the second mounting holes (32) are evenly distributed in the circumferential direction outside the first mounting hole (31).

5. The tie rod assembly according to claim 1, wherein: The front end connector (22) of the swivel connecting rod (2) has a length of L1, and the depth of the swivel connecting rod mounting hole (11) is L2; The difference △L between L1 and L2 satisfies the following: 0.015mm≤△L≤0.02mm.

6. A shaft core assembly, characterized in that: It comprises an axis core (6) and a pull rod assembly according to any one of claims 1 to 5.

7. The shaft core assembly according to claim 6, characterized in that: A portion of the pull rod assembly is inserted into the shaft core (6), and another portion protrudes from the outside of the shaft core (6); The shaft core assembly further includes: An encoder spacer ring (7), wherein a spacer ring mounting hole (71) is provided in the middle of the encoder spacer ring (7), and the encoder spacer ring (7) is fixedly sleeved on the shaft core (6) through the spacer ring mounting hole (71) and is arranged around the outer periphery of the pull rod assembly protruding from the outside of the shaft core (6); The encoder spacer ring (7) comprises a first side (7a) for fixedly connecting to the shaft core (6) and a second side (7b) opposite to the first side (7a), wherein the second side (7b) is provided with an anti-rotation piece mounting groove (72), and the anti-rotation piece mounting groove (72) is a slot with an opening, wherein the anti-rotation piece mounting groove (72) opens to the spacer ring mounting hole (71); An anti-rotation plate (8) is detachably mounted in the anti-rotation plate mounting groove (72) and cooperates with the outer periphery of the pull rod assembly protruding from the outside of the shaft core (6) to limit the circumferential rotation of the pull rod assembly relative to the shaft core (6).

8. The shaft core assembly according to claim 7, characterized in that: An anti-rotation structure is formed between the anti-rotation sheet (8) and the outer periphery of the pull rod assembly; The anti-rotation structure comprises a first anti-rotation plane (81) formed on the side wall of the anti-rotation plate (8), and a second anti-rotation plane (14) formed on the outer periphery of the pull rod (1); The first anti-rotation plane (81) cooperates with the second anti-rotation plane (14) to limit the circumferential rotation of the pull rod assembly relative to the shaft core (6); A positioning pin hole for installing the second fastener (5) is formed on the second anti-rotation plane (14).

9. The shaft core assembly according to claim 8, characterized in that: The anti-rotation piece (8) is an arc-shaped piece as a whole, and the anti-rotation piece (8) includes a pull rod matching surface (8a) matching with the outer periphery of the pull rod, and an installation groove matching surface (8b) opposite to the pull rod matching surface (8a) for matching with the groove wall surface of the anti-rotation piece installation groove (72); The first anti-rotation plane (81) is formed on the pull rod matching surface (8a).

10. The shaft core assembly according to claim 9, characterized in that: The pull rod matching surface (8a) further includes arcuate surfaces (82) located on both sides of the first anti-rotation plane (81), and the arcuate surfaces (82) match the outer circular surface of the pull rod (1); The anti-rotation sheet (8) is further provided with an arc-shaped notch (83) located between the first anti-rotation plane (81) and the arc-shaped surface (82).

11. An electric spindle, characterized in that: The invention comprises the shaft core component according to any one of claims 6 to 10.

12. The electric spindle according to claim 11, characterized in that: The electric spindle is a center water outlet electric spindle.

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