A head accessory machining capable horizontal main shaft structure

Abstract

The application discloses a horizontal milling spindle structure capable of accessory head processing, comprising a horizontal milling spindle assembly, a C-axis rotating assembly is sleeved on the outer side of a front bearing seat, a dust cover assembly or an accessory head assembly is detachably connected to the front side of the C-axis rotating assembly, the dust cover assembly is sleeved on the outer side of the front end of the main shaft, the C-axis rotating assembly comprises a C-axis rotating shaft, a YRT bearing, a C-axis bearing seat, a pull head oil cylinder, a pull knife claw jacking rod, a pull head oil cylinder claw, an annular pneumatic clamp, a rotor connecting disc, a torque motor rotor, a torque motor stator and a torque motor stator sleeve, the dust cover assembly comprises a dust cover, a water sealing ring and a first pull sleeve, and the accessory head assembly comprises an accessory head body, a transition disc and a second pull sleeve. The horizontal milling spindle structure has the characteristics of novel and compact structure, low cost, good universality and expansibility, can realize two modes of horizontal milling spindle with dust cover processing and accessory head processing, has the automatic head changing function, and can realize the automatic switching of the two modes.

Description

Technical Field

[0001] This invention belongs to the field of CNC machining, specifically relating to a horizontal machining spindle structure capable of machining with an attachment head. Background Technology

[0002] A horizontal machining center is generally defined as a machining center whose spindle axis is parallel to the worktable. Horizontal machining centers can achieve indexing and rotary machining by using the indexing and rotation of the rotary table. They are suitable for machining parts by performing milling, drilling, boring, reaming, tapping, and multi-face machining operations in one or more clamping operations on the same machine tool. They are widely used in the automotive, internal combustion engine, aerospace, and general machinery industries.

[0003] Existing horizontal machining centers typically only have linear feed along the X, Y, and Z axes, a worktable rotating around the Y-axis, and a spindle rotating around the Z-axis. Machining complex parts requires a cradle rotary table, but this results in a cramped machine space, especially for larger parts, leading to poor maneuverability. Furthermore, cradle rotary tables are expensive, significantly increasing machine tool manufacturing costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a horizontal machining spindle structure that can be used for machining with an attachment head, which is novel, compact, low in cost, and has good versatility and expandability. It can realize two modes of machining: machining with a dust cover and machining with an attachment head. It also has an automatic head changing function, which can realize automatic switching between the two modes.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a horizontal machining spindle structure capable of machining with an attachment head, comprising a horizontal machining spindle assembly, wherein the horizontal machining spindle assembly includes a spindle, a synchronous motor stator, a synchronous motor rotor, a spindle box, and a broach assembly. The front end of the spindle is mounted on a front bearing, the front bearing is mounted on a front bearing housing, the synchronous motor rotor is connected to the spindle by an interference fit, the synchronous motor stator is sleeved on the outside of the synchronous motor rotor, and a synchronous motor stator sleeve is centered and fixed on the outside of the synchronous motor stator. The broach assembly is installed inside the spindle, and a C-axis rotating assembly is sleeved on the outside of the front bearing housing. A dust cover assembly or an attachment head assembly is detachably connected to the front side of the C-axis rotating assembly. The dust cover assembly is sleeved on the outside of the front end of the spindle. When the dust cover assembly is connected to the front side of the C-axis rotating assembly, in conjunction with a tool magazine, the spindle realizes automatic tool changing and machining with a tool; when the attachment head assembly is connected to the front side of the C-axis rotating assembly, the attachment head assembly realizes machining with a tool.

[0006] The C-axis rotating assembly includes a C-axis rotating shaft, a YRT bearing, a C-axis bearing housing, a puller cylinder, a puller claw push rod, a puller cylinder claw, an annular pneumatic clamp, a rotor connecting plate, a torque motor rotor, a torque motor stator, and a torque motor stator sleeve. The C-axis rotating shaft is a stepped shaft, sleeved on the outside of the front bearing housing. The outer ring of the YRT bearing is centered and fixed within the C-axis bearing housing, with its front end face resting on the C-axis rotating shaft. The inner ring of the YRT bearing is centered and fixed on the outside of the C-axis rotating shaft. The pneumatic clamp is mounted on the C-axis bearing housing, sleeved on the outside of the C-axis rotating shaft and located behind the YRT bearing. The rotor connecting plate is fixed to the... The rear end of the C-axis rotating shaft, the torque motor rotor is fixed to the rear end of the rotor connecting plate, the torque motor stator is sleeved on the outside of the torque motor rotor, the torque motor stator sleeve is centered and fixed on the outside of the torque motor stator, the front end of the torque motor stator sleeve is centered and fixed to the rear end of the C-axis bearing seat, the rear end of the torque motor stator sleeve is fixed on the spindle box, the front end of the C-axis rotating shaft is fixed with a first gear plate and a quick-connect female connector, the puller claw push rod and the puller head cylinder claw are respectively set in the puller head cylinder, the puller head cylinder is set in the C-axis rotating shaft, the puller head cylinder is connected to the external hydraulic oil supply mechanism through the oil circuit, and the puller head cylinder claw is sleeved on the outside of the puller claw push rod;

[0007] The dust cover assembly includes a dust cover, a water sealing ring, and a first pull sleeve. The water sealing ring is centered and fixed on the outside of the dust cover. A second toothed disc, a first quick-connect male connector, and a first pull sleeve are fixed on the dust cover. The second toothed disc is used to mesh with the first toothed disc. The first pull sleeve is used to sleeve the pull head cylinder claw. A first annular groove is formed on the dust cover. The first annular groove is connected to an external coolant supply mechanism via a liquid passage. The first annular groove is connected to the first quick-connect male connector. The first quick-connect male connector is used to insert into the quick-connect female connector to conduct the liquid passage. The first annular groove is used to install a first nozzle, through which coolant is sprayed out to achieve the external cooling function of the tool.

[0008] The accessory head assembly includes an accessory head body, a transition plate, and a second pull sleeve. The accessory head body is centered and fixed to the front side of the transition plate. A third toothed disc, a second quick-connect male connector, and a second pull sleeve are fixed on the transition plate. The third toothed disc engages with the first toothed disc, and the second pull sleeve is used to engage the pull head cylinder claw. A second annular groove is formed on the transition plate. The second annular groove communicates with an external coolant supply mechanism via a fluid passage. The second annular groove communicates with the second quick-connect male connector, which is used to connect to the quick-connect female connector to open the fluid passage. The second annular groove is used to install a second nozzle, through which coolant is sprayed to achieve external cooling of the tool.

[0009] The horizontal machining center spindle structure of this invention provides an additional C-axis rotational degree of freedom through a C-axis rotational assembly. The C-axis rotational assembly, in conjunction with the dust cover assembly and the accessory head assembly, enables two machining modes: machining with a dust cover and machining with an accessory head. It also features an automatic head-changing function, allowing for automatic switching between the two modes.

[0010] When the horizontal machining center spindle structure consists of three parts: the horizontal machining center spindle assembly, the C-axis rotation assembly, and the dust cover assembly, the horizontal machining center spindle can perform machining with the dust cover. In this case, with the tool magazine, the spindle can perform automatic tool changing. The spindle with the tool can perform milling, drilling, boring, reaming, tapping and other machining functions. The dust cover will not interfere with the machining range of the tool. This horizontal machining center spindle structure has the same function as a regular horizontal machining center spindle.

[0011] When the horizontal machining center spindle structure consists of three parts: the horizontal machining center spindle assembly, the C-axis rotary assembly, and the attachment head assembly, the horizontal machining center spindle can perform machining with the attachment head. At this time, the attachment head has a cutting tool at its front end, which can realize machining functions such as milling, drilling, boring, reaming, and tapping of the internal cavity of box-type parts. The attachment head can also rotate freely 360°, which can process complex parts with multiple angles.

[0012] The automatic head-changing function of the horizontal machining center spindle structure of this invention is achieved through hydraulic circuits, a first gear plate, a second gear plate, a third gear plate, a first pull sleeve, a second pull sleeve, a pull head cylinder, a puller pawl push rod, and a pull head cylinder pawl. Specifically, when the horizontal machining center spindle is in machining mode with a dust cover, the hydraulic oil is controlled to drive the puller pawl push rod backward, which in turn tightens the first pull sleeve, causing the dust cover to move backward until the second gear plate is fully engaged with the first gear plate. When it is necessary to change to machining mode with an accessory head on the horizontal machining center spindle, the hydraulic oil is controlled to drive the puller pawl push rod forward, which in turn retracts the pull head cylinder pawl, releasing the first pull sleeve. In the first pull sleeve, the horizontal machining center drives the X, Y, and Z axes to move, removing the dust cover assembly and placing it on the head magazine support, thus separating the dust cover assembly from the C-axis rotating assembly. Then, the horizontal machining center drives the X, Y, and Z axes to approach the accessory head assembly placed on the head magazine support, controlling the hydraulic oil to drive the puller claw push rod forward until the puller head cylinder claw enters the second pull sleeve. At this point, the hydraulic oil drives the puller claw push rod backward, causing the puller head cylinder claw to tighten the second pull sleeve until the third gear plate fully engages with the first gear plate. This completes the automatic head-changing action, i.e., the gripping action of the accessory head assembly.

[0013] This invention provides a horizontal machining center spindle structure that enables automatic external tool cooling in both machining modes with and without a dust cover. In the dust cover machining mode, when external tool cooling is required, the first quick-connect male connector is inserted into the quick-connect female connector, opening the fluid path and allowing coolant from an external coolant supply mechanism to flow into the first annular groove. The first annular groove then sprays coolant out through a first nozzle, achieving external tool cooling. When the dust cover assembly disengages from the C-axis rotation assembly, the first quick-connect male connector separates from the quick-connect female connector, closing the fluid path and preventing coolant leakage. Similarly, in the attachment head machining mode, when external tool cooling is required, the second quick-connect male connector is inserted into the quick-connect female connector, opening the fluid path and allowing coolant from an external coolant supply mechanism to flow into the second annular groove. The second annular groove then sprays coolant out through a second nozzle, achieving external tool cooling. When the accessory head assembly disengages from the C-axis rotating assembly, the second quick-connect male connector separates from the quick-connect female connector, the fluid circuit is sealed, and the coolant will not leak.

[0014] Preferably, the oil circuit includes a first oil circuit and a second oil circuit that are connected. The first oil circuit is connected to an external hydraulic oil supply mechanism, and the second oil circuit is connected to the puller cylinder. The first oil circuit is located on the spindle box, and the second oil circuit is located on the C-axis rotating shaft. The fluid circuit includes a first fluid circuit and a second fluid circuit that are connected. The first fluid circuit is located on the front bearing housing, and the second fluid circuit is located on the C-axis rotating shaft. The first fluid circuit is connected to an external coolant supply mechanism, and the second fluid circuit is connected to the quick-connect female connector. A plurality of rotary sealing rings are installed between the front bearing housing and the C-axis rotating shaft.

[0015] Preferably, a dust cover is fitted and fixed to the outer side of the front end of the C-axis bearing housing, and a labyrinth is formed between the dust cover and the C-axis rotating shaft to achieve a better protective effect and prevent dust and debris from entering the C-axis bearing housing.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] (1) The structure of the horizontal machining spindle of the present invention is novel and compact. It does not change the overall structure of the horizontal machining center. It only needs to set a C-axis rotating assembly on the outside of the front bearing seat of the original horizontal machining spindle assembly, and equip the C-axis rotating assembly with a dust cover assembly or an accessory head assembly. This can realize two modes of horizontal machining spindle with dust cover and with accessory head, and can improve the machining capability of ordinary horizontal machining centers, so that the horizontal machining machine tool has a richer machining range, especially for multi-angle machining of the inner cavity of box-type parts;

[0018] (2) The horizontal machining center structure of the present invention has an automatic head-changing function, which can realize the automatic switching between two modes and has a high degree of automation;

[0019] (3) In the two modes of machining with dust cover and machining with attachment head, the horizontal machining spindle structure of the present invention can realize the opening and closing of the fluid circuit by opening and closing the first quick-connect male connector and the second quick-connect male connector and the quick-connect female connector, thereby realizing the automatic tool external cooling function. The function switching and action control are simple.

[0020] (4) Compared with the cradle turntable, the modification cost of the horizontal main shaft structure of the present invention is lower, which has good economic efficiency and can save more than 50% of the cost.

[0021] (5) The horizontal machining center structure of the present invention has strong versatility and expandability. In the future, by expanding the types of attachment heads, more functional attachment heads can be configured, such as extension heads, flat milling heads, etc. At the same time, the automatic tool-cutting function of the attachment head can be realized by optimizing the C-axis rotation component. Attached Figure Description

[0022] Figure 1 This is a schematic diagram showing the appearance of the horizontal machining spindle with a dust cover during machining, as illustrated in the embodiment.

[0023] Figure 2 This is a longitudinal section diagram of the machining process of the horizontal spindle with dust cover in the embodiment;

[0024] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 This is a schematic diagram showing the appearance of the horizontal machining spindle with attachment head during machining in the embodiment;

[0026] Figure 5 This is a longitudinal section diagram of the machining process of the horizontal machining spindle with accessory head in the embodiment;

[0027] Figure 6 for Figure 5 Enlarged view of section B in the middle. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] The horizontal machining center spindle structure of the embodiment, which can be used for machining with an attachment head, is shown in the figure. It includes a horizontal machining center spindle assembly, which comprises a spindle 1, a synchronous motor stator 11, a synchronous motor rotor 12, a spindle housing 13, and a broach assembly 14. The front end of the spindle 1 is mounted on a front bearing 15, which is mounted on a front bearing housing 16. The synchronous motor rotor 12 is connected to the spindle 1 via an interference fit. The synchronous motor stator 11 is sleeved on the outside of the synchronous motor rotor 12, and the outside of the synchronous motor stator 11 is centered and fitted. A synchronous motor stator sleeve 17 is fixed, a tool draw assembly 14 is installed inside the spindle 1, and a C-axis rotating assembly is sleeved on the outside of the front bearing housing 16. A dust cover assembly or an accessory head assembly is detachably connected to the front side of the C-axis rotating assembly. The dust cover assembly is sleeved on the outside of the front end of the spindle 1. When the dust cover assembly is connected to the front side of the C-axis rotating assembly, the spindle 1 can achieve automatic tool changing and tool-carrying functions in conjunction with the tool magazine. When the accessory head assembly is connected to the front side of the C-axis rotating assembly, the accessory head assembly can achieve tool-carrying functions.

[0030] In this embodiment, the C-axis rotation assembly includes a C-axis rotation shaft 2, a YRT bearing 21, a C-axis bearing seat 22, a puller head cylinder 23, a puller claw push rod 24, a puller head cylinder claw 25, an annular pneumatic clamp 26, a rotor connecting plate 27, a torque motor rotor 28, a torque motor stator 29, and a torque motor stator sleeve 20. A dust cover 31 is fitted and fixed to the outer side of the front end of the C-axis bearing housing 22. The dust cover 31 and the C-axis rotating shaft 2 form a labyrinth. The C-axis rotating shaft 2 is a stepped shaft. The C-axis rotating shaft 2 is fitted to the outer side of the front bearing housing 16. The outer ring of the YRT bearing 21 is centered and fixed inside the C-axis bearing housing 22. The front end face of the YRT bearing 21 rests on the C-axis rotating shaft 2. The inner ring of the YRT bearing 21 is centered and fixed to the outer side of the C-axis rotating shaft 2. The pneumatic clamp 26 is installed on the C-axis bearing housing 22. The pneumatic clamp 26 is fitted to the outer side of the C-axis rotating shaft 2 and located behind the YRT bearing 21. When the pneumatic clamp 26 is open, the C-axis rotating shaft 2 can rotate freely. When the pneumatic clamp 26 is clamped, the C-axis rotating shaft 2 is held and cannot rotate, thus acting as a brake. The rotor connecting plate 27 is fixed to the rear end of the C-axis rotating shaft 2. The torque motor rotor 28 is fixed to the rear end of the rotor connecting plate 27. The torque motor stator 29 is sleeved on the outside of the torque motor rotor 28. The torque motor stator sleeve 20 is centered and fixed on the outside of the torque motor stator 29. When the torque motor is energized, it can drive the torque motor rotor 28 to rotate, thereby providing power to the C-axis rotating shaft 2. The front end of the torque motor stator sleeve 20 is centered and fixed to the rear end of the C-axis bearing housing 22. The rear end of the torque motor stator sleeve 20 is fixed on the spindle box 13. The C-axis bearing housing 22, the torque motor stator sleeve 20, and the spindle box 13 form a fixed part. The front end of the C-axis rotating shaft 2 is fixed with a first gear plate 32 and a quick-connect female connector 33. The puller claw push rod 24 and the puller head cylinder claw 25 are respectively set in the puller head cylinder 23. The puller head cylinder 23 is set in the C-axis rotating shaft 2. The puller head cylinder 23 is connected to the external hydraulic oil supply mechanism through the oil circuit. The puller head cylinder claw 25 is sleeved on the outside of the puller claw push rod 24.

[0031] In this embodiment, the dust cover assembly includes a dust cover 4, a water sealing ring 41, and a first pull sleeve 42. The water sealing ring 41 is centered and fixed on the outside of the dust cover 4. A second toothed disc 43, a first quick-connect male connector 44, and a first pull sleeve 42 are fixed on the dust cover 4. The second toothed disc 43 is used to mesh with the first toothed disc 32, and the first pull sleeve 42 is used to connect to the pull head cylinder claw 25. A first annular groove 45 is provided on the dust cover 4. The first annular groove 45 is connected to an external coolant supply mechanism through a liquid passage. The first annular groove 45 is connected to the first quick-connect male connector 44. The first quick-connect male connector 44 is used to connect to the quick-connect female connector 33 to conduct the liquid passage. The first annular groove 45 is used to install a first nozzle (not shown in the figure). The coolant is sprayed out through the first nozzle to achieve the external cooling function of the tool.

[0032] In this embodiment, the accessory head assembly includes an accessory head body 5, a transition plate 51, and a second pull sleeve 52. The accessory head body 5 is centered and fixed to the front side of the transition plate 51. A third toothed disc 53, a second quick-connect male connector 54, and a second pull sleeve 52 are fixed on the transition plate 51. The third toothed disc 53 is used to mesh with the first toothed disc 32, and the second pull sleeve 52 is used to connect to the pull head cylinder claw 25. A second annular groove 55 is provided on the transition plate 51. The second annular groove 55 is connected to an external coolant supply mechanism via a liquid passage. The second annular groove 55 is connected to the second quick-connect male connector 54. The second quick-connect male connector 54 is used to connect to the quick-connect female connector 33 to conduct the liquid passage. The second annular groove 55 is used to install a second nozzle (not shown in the figure). The coolant is sprayed out through the second nozzle to achieve the external cooling function of the tool.

[0033] In this embodiment, the oil circuit includes a first oil circuit 61 and a second oil circuit 62 that are connected. The first oil circuit 61 is connected to an external hydraulic oil supply mechanism, and the second oil circuit 62 is connected to the pull head cylinder 23. The first oil circuit 61 is located on the spindle box 13, and the second oil circuit 62 is located on the C-axis rotating shaft 2. The liquid circuit includes a first liquid circuit 71 and a second liquid circuit 72 that are connected. The first liquid circuit 71 is located on the front bearing seat 16, and the second liquid circuit 72 is located on the C-axis rotating shaft 2. The first liquid circuit 71 is connected to an external coolant supply mechanism, and the second liquid circuit 72 is connected to a quick-connect female connector 33. A plurality of rotating sealing rings 73 are installed between the front bearing seat 16 and the C-axis rotating shaft 2.

[0034] The horizontal machining center spindle structure described above, including the horizontal machining center spindle assembly, pneumatic clamp 26, puller head cylinder 23, puller claw push rod 24, puller head cylinder claw 25, first puller sleeve 42, and second puller sleeve 52, all employ conventional designs. The aforementioned horizontal machining center spindle structure also includes other components that enable its normal operation, all of which are conventional techniques in the art. Any devices or components not specified in this invention employ conventional techniques in the art.

[0035] The aforementioned horizontal machining spindle structure can achieve two modes: machining with a dust cover and machining with an attachment head. It also features an automatic head-changing function, allowing for automatic switching between the two modes. Compared to a cradle turntable, the modification cost of this horizontal machining spindle structure is lower, offering significant economic benefits and saving over 50,000 yuan.

[0036] When the dust cover assembly is connected to the front side of the C-axis rotary assembly, such as Figure 1 and Figure 2 As shown, this horizontal machining center spindle structure consists of three parts: a horizontal machining center spindle assembly, a C-axis rotation assembly, and a dust cover assembly. It enables machining with a dust cover on the horizontal machining center spindle. When used with a tool magazine, the spindle can perform automatic tool changing. Machining with the spindle can perform milling, drilling, boring, reaming, and tapping operations. The dust cover does not interfere with the machining range of the tool. This horizontal machining center spindle structure has the same functionality as a conventional horizontal machining center spindle.

[0037] When the front side of the C-axis rotary assembly is connected to the accessory head assembly, such as Figure 4 and Figure 5 As shown, this horizontal machining center spindle structure consists of three parts: a horizontal machining center spindle assembly, a C-axis rotary assembly, and an attachment head assembly. It can realize machining with an attachment head on the horizontal machining center spindle. At this time, the front end of the attachment head carries a cutting tool for machining, which can realize machining functions such as milling, drilling, boring, reaming, and tapping of the internal cavity of box-type parts. The attachment head can also rotate freely 360°, which can machine complex parts with various angles.

Claims

1. A horizontal machining spindle structure capable of machining with an attachment head, comprising a horizontal machining spindle assembly, the horizontal machining spindle assembly including a spindle, a synchronous motor stator, a synchronous motor rotor, a spindle box, and a broach assembly, wherein the front end of the spindle is mounted on a front bearing, the front bearing is mounted on a front bearing housing, the synchronous motor rotor is connected to the spindle by an interference fit, the synchronous motor stator is sleeved on the outside of the synchronous motor rotor, a synchronous motor stator sleeve is centered and fixed on the outside of the synchronous motor stator, and the broach assembly is installed inside the spindle, characterized in that, A C-axis rotating assembly is fitted onto the outer side of the front bearing housing. A dust cover assembly or an accessory head assembly is detachably connected to the front side of the C-axis rotating assembly. The dust cover assembly is fitted onto the outer side of the front end of the spindle. When the dust cover assembly is connected to the front side of the C-axis rotating assembly, in conjunction with the tool magazine, the spindle can achieve automatic tool changing and tool-assisted machining functions. When the accessory head assembly is connected to the front side of the C-axis rotating assembly, the accessory head assembly can achieve tool-assisted machining functions. The C-axis rotating assembly includes a C-axis rotating shaft, a YRT bearing, a C-axis bearing housing, a puller cylinder, a puller claw push rod, a puller cylinder claw, an annular pneumatic clamp, a rotor connecting plate, a torque motor rotor, a torque motor stator, and a torque motor stator sleeve. The C-axis rotating shaft is a stepped shaft, sleeved on the outside of the front bearing housing. The outer ring of the YRT bearing is centered and fixed within the C-axis bearing housing, with its front end face resting on the C-axis rotating shaft. The inner ring of the YRT bearing is centered and fixed on the outside of the C-axis rotating shaft. The pneumatic clamp is mounted on the C-axis bearing housing, sleeved on the outside of the C-axis rotating shaft and located behind the YRT bearing. The rotor connecting plate is fixed to the... The rear end of the C-axis rotating shaft, the torque motor rotor is fixed to the rear end of the rotor connecting plate, the torque motor stator is sleeved on the outside of the torque motor rotor, the torque motor stator sleeve is centered and fixed on the outside of the torque motor stator, the front end of the torque motor stator sleeve is centered and fixed to the rear end of the C-axis bearing seat, the rear end of the torque motor stator sleeve is fixed on the spindle box, the front end of the C-axis rotating shaft is fixed with a first gear plate and a quick-connect female connector, the puller claw push rod and the puller head cylinder claw are respectively set in the puller head cylinder, the puller head cylinder is set in the C-axis rotating shaft, the puller head cylinder is connected to the external hydraulic oil supply mechanism through the oil circuit, and the puller head cylinder claw is sleeved on the outside of the puller claw push rod; The dust cover assembly includes a dust cover, a water sealing ring, and a first pull sleeve. The water sealing ring is centered and fixed on the outside of the dust cover. A second toothed disc, a first quick-connect male connector, and a first pull sleeve are fixed on the dust cover. The second toothed disc is used to mesh with the first toothed disc. The first pull sleeve is used to sleeve the pull head cylinder claw. A first annular groove is formed on the dust cover. The first annular groove is connected to an external coolant supply mechanism via a liquid passage. The first annular groove is connected to the first quick-connect male connector. The first quick-connect male connector is used to insert into the quick-connect female connector to conduct the liquid passage. The first annular groove is used to install a first nozzle, through which coolant is sprayed out to achieve the external cooling function of the tool. The accessory head assembly includes an accessory head body, a transition plate, and a second pull sleeve. The accessory head body is centered and fixed to the front side of the transition plate. A third toothed disc, a second quick-connect male connector, and a second pull sleeve are fixed on the transition plate. The third toothed disc engages with the first toothed disc, and the second pull sleeve is used to engage the pull head cylinder claw. A second annular groove is formed on the transition plate. The second annular groove communicates with an external coolant supply mechanism via a fluid passage. The second annular groove communicates with the second quick-connect male connector, which is used to connect to the quick-connect female connector to open the fluid passage. The second annular groove is used to install a second nozzle, through which coolant is sprayed to achieve external cooling of the tool.

2. The horizontal machining spindle structure capable of machining with an attachment head according to claim 1, characterized in that, The oil circuit includes a first oil circuit and a second oil circuit that are connected. The first oil circuit is connected to an external hydraulic oil supply mechanism, and the second oil circuit is connected to the puller cylinder. The first oil circuit is located on the spindle box, and the second oil circuit is located on the C-axis rotating shaft. The fluid circuit includes a first fluid circuit and a second fluid circuit that are connected. The first fluid circuit is located on the front bearing housing, and the second fluid circuit is located on the C-axis rotating shaft. The first fluid circuit is connected to an external coolant supply mechanism, and the second fluid circuit is connected to the quick-connect female connector. Several rotary sealing rings are installed between the front bearing housing and the C-axis rotating shaft.

3. A horizontal machining spindle structure capable of machining with an attachment head according to claim 1 or 2, characterized in that, A dust cover is fitted and fixed to the outer side of the front end of the C-axis bearing housing, and a labyrinth is formed between the dust cover and the C-axis rotating shaft.

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