A drilling center machine tool and its control method

Abstract

The present invention belongs to the technical field of drilling equipment, and in particular relates to a drilling center machine tool and a control method thereof, comprising a frame, a spindle mechanism and a feed mechanism, wherein a processing table is mounted on the frame, the spindle mechanism is mounted on the frame and is located above the processing table; the feed mechanism is mounted on the frame and is used for feeding the spindle mechanism, wherein the locking mechanism is also included, and the locking mechanism is used for axial locking of the spindle mechanism when changing tools; by locking the spindle axially through the locking mechanism when replacing a drill bit on the spindle, the force on the spindle is reduced, and a better protection effect is achieved on the spindle, thereby avoiding affecting the service life of the spindle after repeated replacement of the drill bit for a long time.

Description

Technical Field

[0001] The present invention belongs to the technical field of drilling equipment, and in particular relates to a drilling center machine tool and a control method thereof. Background Art

[0002] A drilling center typically consists of a machining center, spindle, drill bit, measurement system, and control system. The machining center holds the workpiece; the spindle mounts the drill bit and drives its rotation; the drill bit drills the workpiece; the measurement system monitors the drill bit's position to ensure quality and accuracy; and the control system oversees the entire drilling process.

[0003] Traditional drill bit replacement is usually done manually, which is time-consuming and labor-intensive. In order to improve the convenience and efficiency of drill bit replacement, a tool magazine is installed on the side of the spindle mechanism to realize automatic drill bit replacement. For example, Chinese patent application number (CN202021409536.6) discloses an improved drilling and tapping center machine. The application sets up a tool magazine and slides on the tool holder through the Z-axis drive mechanism to make the drive end drive the spindle to loosen or clamp the tool, thereby realizing automatic tool changing operation. There is no need for manual tool changing, which reduces the labor intensity of the staff, and the tool change is rapid, thereby improving processing efficiency. However, the tool changing assembly of the application does not limit the spindle in the axial direction, which easily causes the spindle to be subjected to force during tool change, which can easily affect the spindle over time and reduce the processing accuracy. Summary of the Invention

[0004] The purpose of the present invention is to provide a drilling center machine tool and a control method thereof in order to solve the above-mentioned technical problems, so as to achieve the effect of axially locking the spindle and reducing the stress on the spindle when the spindle tool is changed.

[0005] In view of this, the present invention provides a drilling center machine tool, characterized by comprising:

[0006] A machine frame, on which a processing table is mounted;

[0007] The spindle mechanism is installed on the frame and is located above the machining table;

[0008] A feeding mechanism is installed on the frame and is used for feeding the spindle mechanism;

[0009] The locking mechanism is used for axial locking of the spindle mechanism when changing tools.

[0010] In the above technical solution, further, the spindle mechanism includes:

[0011] a housing, wherein the housing is mounted on the feeding mechanism;

[0012] The main shaft is installed in the housing, and both ends of the main shaft extend out of the housing, and a first abutment portion is provided at the top end;

[0013] A pull rod is coaxially arranged in the main shaft, and a top end of the pull rod extends out of the main shaft and is provided with a second abutment portion;

[0014] The locking mechanism is used to limit the first abutting portion and the second abutting portion in the axial direction.

[0015] In the above technical solution, further, the locking mechanism includes:

[0016] a first clamping member, one end of the first clamping member being hingedly connected to the housing and the other end of the first clamping member being clamped to the first abutting portion;

[0017] A first adjusting plate, the first adjusting plate is mounted on the frame;

[0018] a second clamping member, the second clamping member being hingedly connected to the first clamping member, with one end of the second clamping member abutting against the first adjusting plate and the other end abutting against the second abutting portion;

[0019] The first adjustment plate is used to adjust the opening and closing angle between the first clamping member and the second clamping member.

[0020] In the above technical solution, further, the locking mechanism also includes:

[0021] a first roller, the first roller being mounted on one end of the second clamping member close to the first adjusting plate;

[0022] a second roller, the second roller being mounted on one end of the second clamping member close to the second abutting portion;

[0023] The first roller is used to roll on the first adjustment plate, and the second roller is used to roll on the surface of the second abutting portion.

[0024] In the above technical solution, further, the spindle mechanism also includes:

[0025] An elastic member is installed in the main shaft and sleeved on the surface of the pull rod, with two ends of the elastic member respectively abutting against the main shaft and the pull rod;

[0026] The pull rod is slidably connected in the main shaft along the axial direction.

[0027] In the above technical solution, further comprising:

[0028] The tool magazine mechanism is installed on the frame and located on the side of the shell;

[0029] Among them, the tool magazine mechanism includes:

[0030] A bracket, the bracket is hingedly connected to the frame;

[0031] The tool holder is mounted on the bracket and is rotatably connected to the bracket and is provided with a motor to drive the rotation;

[0032] A plurality of clamps are provided on the tool holder at equal intervals around the circumference and are used to clamp the drill bit;

[0033] Among them, the clamp located at the lowest position is coaxially arranged with the main shaft, and the clamp is adapted to the bottom end of the pull rod.

[0034] In the above technical solution, further, the tool magazine mechanism also includes:

[0035] A second adjustment plate, the second adjustment plate is mounted on the side of the housing;

[0036] A push rod, one end of which is connected to the bracket and the other end of which is in contact with the second adjustment plate;

[0037] The second adjustment plate is used to adjust the opening and closing angle between the bracket and the frame.

[0038] In the above technical solution, further, the tool magazine mechanism also includes:

[0039] A third roller, the third roller is mounted on one end of the push rod close to the second adjustment plate;

[0040] The third roller is used for rolling on the first adjusting plate.

[0041] In the above technical solution, further, the feeding mechanism includes:

[0042] Cross slide, the cross slide is installed on the frame and is used to connect the processing table and the frame, and is used to drive the processing table to move in the horizontal direction;

[0043] The screw drive assembly is installed on the frame and is driven by a motor and is used to drive the spindle mechanism to move in the vertical direction.

[0044] In the above technical solution, further,

[0045] The beneficial effects of the present invention are:

[0046] 1. When the drill bit is replaced on the spindle, the spindle is locked upward through the locking mechanism to reduce the force on the spindle, thus providing better protection for the spindle and avoiding affecting the service life of the spindle after repeated drill bit replacement for a long time.

[0047] 2. By means of a first abutment portion provided at the top end of the spindle, a second abutment portion provided at the top end of the pull rod, and a first clamping member and a second clamping member that are clamped in a scissor-like manner, and by means of a first adjustment plate, the opening and closing angles of the first clamping member and the second clamping member are adjusted. That is, as the spindle mechanism rises or falls under the action of the feed mechanism, the clamping force between the first clamping member and the second clamping member is automatically adjusted, thereby improving the convenience of limiting and releasing the axial locking of the spindle;

[0048] 3. By disposing the first roller and the second roller, the wear between the first clamping member and the first adjustment plate and between the second clamping member and the second abutting portion is reduced;

[0049] 4. Through the setting of the push rod and the second adjustment plate, when the spindle mechanism descends under the action of the feed mechanism, the push rod can push open the bracket and then push open the tool holder, so as to prevent the tool holder from affecting the continued descent of the spindle mechanism. When the spindle mechanism rises, the tool holder can be reset, thereby facilitating the replacement of the drill bit, effectively improving convenience and processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a structural schematic diagram of the present invention;

[0051] Figure 2 It is a structural schematic diagram of the present invention located at the spindle mechanism;

[0052] Figure 3 This invention Figure 2 Enlarged view of point A in the middle;

[0053] Figure 4 This invention Figure 2 Enlarged view of point B in the middle;

[0054] Figure 5 This invention Figure 2 A top view of

[0055] Figure 6 This invention Figure 5 Cross-sectional view of CC;

[0056] Figure 7 This invention Figure 6 Enlarged view of point D in the middle;

[0057] The markings in the figure are as follows: 1. Frame; 2. Processing table; 3. Spindle mechanism; 30. Housing; 31. Spindle; 32. First abutment portion; 33. Pull rod; 34. Second abutment portion; 35. Elastic member; 4. Feed mechanism; 40. Cross slide; 41. Screw drive assembly; 5. Locking mechanism; 50. First clamping member; 51. First adjustment plate; 52. Second clamping member; 53. First roller; 54. Second roller; 6. Tool magazine mechanism; 60. Bracket; 61. Tool holder; 62. Clamp; 63. Second adjustment plate; 64. Push rod; 65. Third roller; 66. Spherical connecting rod. DETAILED DESCRIPTION

[0058] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0059] Example 1:

[0060] This embodiment provides a drilling center machine tool, comprising:

[0061] A machine frame 1, on which a processing table 2 is mounted;

[0062] The spindle mechanism 3 is installed on the frame 1 and is located above the processing table 2;

[0063] The feeding mechanism 4 is mounted on the frame 1 and is used for feeding the spindle mechanism 3;

[0064] The locking mechanism 5 is used for axial locking of the spindle mechanism 3 during tool change.

[0065] It can be seen from this embodiment that by locking the spindle 31 axially through the locking mechanism 5 when replacing the drill bit on the spindle 31, the force on the spindle 31 is reduced, which has a better protection effect on the spindle 31 and avoids affecting the service life of the spindle 31 after replacing the drill bit many times over a long period of time.

[0066] Example 2:

[0067] This embodiment provides a drilling center machine tool. In addition to the technical solutions of the above embodiments, it also has the following technical features. The spindle mechanism 3 includes:

[0068] The housing 30 is mounted on the feeding mechanism 4;

[0069] The main shaft 31 is installed in the housing 30, and both ends of the main shaft 31 extend out of the housing 30. A first abutment portion 32 is provided at the top end. A rotor is provided on the surface of the main shaft 31 located inside the housing 30, and a corresponding stator is provided on the inner wall of the housing 30;

[0070] A pull rod 33 is coaxially disposed within the main shaft 31 and has a top end extending out of the main shaft 31 and provided with a second abutment portion 34;

[0071] The locking mechanism 5 is used to limit the first abutting portion 32 and the second abutting portion 34 in the axial direction;

[0072] At the same time, the bottom end of the pull rod 33 is connected to a holder 62 for mounting a drill bit and is adapted to the holder 62 , and the first abutting portion 32 is fixedly connected to the main shaft 31 , and the second abutting portion 34 is fixedly connected to the pull rod 33 .

[0073] It can be seen from this embodiment that the first abutting portion 32 and the second abutting portion 34 are provided, and the pull rod 33 is coaxially provided in the main shaft 31 , so that the locking mechanism 5 can lock the first abutting portion 32 and the second abutting portion 34 in the axial direction.

[0074] Example 3:

[0075] This embodiment provides a drilling center machine tool. In addition to the technical solutions of the above embodiments, it also has the following technical features. The locking mechanism 5 includes:

[0076] A first clamping member 50 , one end of which is hingedly connected to the housing 30 and the other end of which is clamped to the first abutting portion 32 ;

[0077] A first adjustment plate 51, the first adjustment plate 51 is installed on the frame 1;

[0078] A second clamping member 52 is hingedly connected to the first clamping member 50 , with one end of the second clamping member 52 abutting against the first adjustment plate 51 and the other end abutting against the second abutting portion 34 ;

[0079] The first adjustment plate 51 is used to adjust the opening and closing angle between the first clamping member 50 and the second clamping member 52;

[0080] At the same time, the second adjustment plate 63 includes a smooth section, a first slope section and a second slope section in sequence from top to bottom, and the slope ratio of the first slope section is greater than the slope ratio of the second slope section.

[0081] It can be seen from the present embodiment that the first abutment portion 32 and the second abutment portion 34 cooperate to form the first clamping member 50 and the second clamping member 52 in a scissor-like clamping manner, and the opening and closing angles of the first clamping member 50 and the second clamping member 52 are adjusted by the first adjustment plate 51, that is, as the spindle mechanism 3 rises or falls under the action of the feed mechanism 4, the clamping force between the first clamping member 50 and the second clamping member 52 is automatically adjusted, thereby improving the convenience of limiting and releasing the axial locking of the spindle 31.

[0082] Example 4:

[0083] This embodiment provides a drilling center machine tool. In addition to the technical solutions of the above embodiments, it also has the following technical features. The locking mechanism 5 also includes:

[0084] A first roller 53 , which is mounted on one end of the second clamping member 52 close to the first adjustment plate 51 ;

[0085] A second roller 54 , which is mounted on one end of the second clamping member 52 close to the second abutting portion 34 ;

[0086] The first roller 53 is used to roll on the first adjustment plate 51 , and the second roller 54 is used to roll on the surface of the second abutting portion 34 .

[0087] It can be seen from this embodiment that the provision of the first roller 53 and the second roller 54 reduces wear between the first clamping member 50 and the first adjustment plate 51 and between the second clamping member 52 and the second abutting portion 34 , thereby extending the service life.

[0088] Example 5:

[0089] This embodiment provides a drilling center machine tool. In addition to the technical solutions of the above embodiments, it also has the following technical features. The spindle mechanism 3 also includes:

[0090] The elastic member 35 is installed in the main shaft 31 and is sleeved on the surface of the pull rod 33, with its two ends respectively abutting against the main shaft 31 and the pull rod 33;

[0091] The pull rod 33 is slidably connected in the main shaft 31 along the axial direction;

[0092] At the same time, the elastic member 35 is preferably a spring and is located on both sides of the spring. A limiting structure is provided between the pull rod 33 and the inner wall of the main shaft 31. Specifically, a pin is provided on the pull rod 33 located on the side of the spring close to the second abutment 34, and a pin hole compatible with the pin is provided on the main shaft 31. A retaining ring is provided on the pull rod 33 located on the side of the spring away from the second abutment 34, and a first support platform is provided on the inner wall of the main shaft 31, and a second support platform is provided on the surface of the pull rod 33. The elastic member 35, that is, the spring, is always in a compressed state. When the first abutment 32 and the second abutment 34 approach each other, the degree of compression of the spring is aggravated.

[0093] It can be seen from this embodiment that the elastic member 35 is adopted to facilitate the installation of the clamp 62. Specifically, under the action of the first clamp 50 and the second clamp 52, the spring will be squeezed and the axial position between the pull rod 33 and the main shaft 31 will be locked. Then, after the clamp 62 is engaged with the pull rod 33, the first clamp 50 and the second clamp 52 will contact and lock. Then, under the action of the elastic member 35 of the pull rod 33, the clamp 62 is pulled to abut against the inner wall of the main shaft 31, thereby achieving the fixation of the clamp 62, that is, the fixation of the drill bit. The structure is simple, the degree of automation is high when combined with the locking mechanism 5, and the tool changing efficiency is high during processing.

[0094] Example 6:

[0095] This embodiment provides a drilling center machine tool. In addition to the technical solutions of the above embodiments, it also has the following technical features:

[0096] The tool magazine mechanism 6 is mounted on the frame 1 and is located on the side of the housing 30;

[0097] Among them, the tool magazine mechanism 6 includes:

[0098] Bracket 60, bracket 60 is hingedly connected to the frame 1;

[0099] The tool holder 61 is mounted on the bracket 60 and is rotatably connected to the bracket 60 and is provided with a motor to drive the rotation;

[0100] A plurality of clamps 62 are provided on the tool holder 61 at equal intervals around the circumference and are used to clamp the drill bit;

[0101] The clamp 62 at the lowest position is coaxially arranged with the main shaft 31, and the clamp 62 is adapted to the bottom end of the pull rod 33;

[0102] At the same time, a spherical connecting rod 66 is provided at the top of the clamp 62, and the bottom end of the pull rod 33 is adapted to the spherical connecting rod 66, that is, the pull rod 33 and the spherical connecting rod 66 can be connected by pressing, and a plurality of strip grooves arranged at equal intervals around the circumference are provided at the connection between the bottom end of the pull rod 33 and the spherical connecting rod 66, so that the spherical connecting rod 66 can be easily inserted into the bottom end of the pull rod 33, and the inner wall of the main shaft 31 is located at the bottom end of the pull rod 33 and adapted to the pull rod 33, and a trumpet-shaped inner wall is provided at the bottom end of the main shaft 31 to prevent the spherical connecting rod 66 from being detached after being inserted into the bottom end of the pull rod 33;

[0103] The actual clamping situation is as follows: the pull rod 33 is acted upon by the second clamping member 52 and slides down along the axis of the main shaft 31, so that the bottom end of the pull rod 33 is pushed out, and the spherical connecting rod 66 is engaged with the bottom end of the pull rod 33. After the second clamping member 52 releases the clamp, the elastic member 35 pulls the clamp 62 into contact with the flared inner wall of the main shaft 31, thereby fixing the clamp 62.

[0104] Furthermore, the tool holder 61 is circumferentially provided with clamps for mounting the clamp 62, and the surface of the clamp 62 is adapted to the clamps; and in order to further improve the clamping stability of the clamps on the clamp 62 and the convenience of releasing the clamp 62, a pneumatic clamp can be used, and the specific structure of the pneumatic clamp is an existing mature technology and will not be repeated here.

[0105] It can be seen from this embodiment that by installing the tool magazine mechanism 6 on the frame 1, manual replacement of the drill bit is avoided, and the convenience of tool changing is improved. The setting of the clamp 62 is adopted to facilitate the connection of the pull rod 33 with it, and then the clamp 62 is axially tightened by the pull rod 33 under the action of the elastic member 35, and then the clamp 62 is fixed. The connection is convenient and the tool changing efficiency is high.

[0106] Example 7:

[0107] This embodiment provides a drilling center machine tool. In addition to the technical solutions of the above embodiments, it also has the following technical features. The tool magazine mechanism 6 also includes:

[0108] A second adjustment plate 63, which is mounted on the side of the housing 30;

[0109] A push rod 64 , one end of which is connected to the bracket 60 and the other end of which is in contact with the second adjustment plate 63 ;

[0110] The second adjustment plate 63 is used to adjust the opening and closing angle between the bracket 60 and the frame 1;

[0111] At the same time, in order to enable the tool holder 61 to be pushed away in time during the downward movement of the spindle mechanism 3, the slope ratio of the sloped surface on the second adjustment plate 63 used to push away the tool holder 61 should be large to avoid possible collision between the spindle mechanism 3 and the tool holder 61.

[0112] It can be seen from this embodiment that, by setting the push rod 64 and the second adjustment plate 63, when the spindle mechanism 3 descends under the action of the feed mechanism 4, the push rod 64 can push open the bracket 60 and then push open the tool holder 61, thereby preventing the tool holder 61 from affecting the continued descent of the spindle mechanism 3, and when the spindle mechanism 3 rises, the tool holder 61 can be reset, thereby facilitating the replacement of the drill bit, and effectively improving convenience and processing efficiency.

[0113] Example 8:

[0114] This embodiment provides a drilling center machine tool. In addition to the technical solutions of the above embodiments, it also has the following technical features. The tool magazine mechanism 6 also includes:

[0115] A third roller 65 , which is mounted on one end of the push rod 64 close to the second adjustment plate 63 ;

[0116] The third roller 65 is used to roll on the first adjustment plate 51 .

[0117] It can be seen from this embodiment that the provision of the third roller 65 reduces the wear between the push rod 64 and the second adjustment plate 63 , thereby extending the service life.

[0118] Example 9:

[0119] This embodiment provides a drilling center machine tool. In addition to the technical solutions of the above embodiments, it also has the following technical features. The feed mechanism 4 includes:

[0120] A cross slide 40 is mounted on the frame 1 and is used to connect the processing table 2 and the frame 1 and to drive the processing table 2 to move in the horizontal direction;

[0121] The screw transmission assembly 41 is mounted on the frame 1 and is driven by a motor and is used to drive the spindle mechanism 3 to move in the vertical direction;

[0122] The cross slide 40 and the screw transmission assembly 41 are both existing mature technologies and will not be described in detail here.

[0123] As can be seen from this embodiment, the cross slide 40 facilitates the movement of the processing table 2 on the X-axis and the Y-axis, while the screw transmission assembly 41 facilitates the movement of the spindle mechanism 3 on the Z-axis.

[0124] Example 10:

[0125] This embodiment provides a drilling center machine tool. In addition to the technical solutions of the above embodiments, it also has the following technical features. The control method of the drilling center machine tool includes the following steps:

[0126] S1: All mechanisms are powered on and enter standby mode;

[0127] S2: The feed mechanism 4 drives the spindle mechanism 3 to rise and reset;

[0128] S3: When the spindle mechanism 3 rises, the locking mechanism 5 is driven to rise. Under the influence of the first adjustment plate 51, the opening and closing angle of the first clamping member 50 and the second clamping member 52 at the end close to the spindle mechanism 3 decreases, and the first abutting portion 32 and the second abutting portion 34 are clamped, so that the pull rod 33 compresses the elastic member 35 and slides down, and the clamp 62 is released.

[0129] S4: Synchronously with S2, the spindle mechanism 3 rises, driving the second adjustment plate 63 to rise. That is, the second adjustment plate 63 reduces the opening and closing angle between the bracket 60 and the frame 1. The tool holder 61 moves closer to the spindle mechanism 3 and engages the clamper 62.

[0130] S5: The spindle mechanism 3 is lifted and reset, and the motor drives the tool holder 61 to rotate and select a suitable drill bit;

[0131] S6: The feed mechanism 4 drives the spindle mechanism 3 to lower the tool and perform cutting operations;

[0132] S7: When the spindle mechanism 3 descends, the locking mechanism 5 is driven to descend. Under the influence of the first adjustment plate 51, the opening and closing angle of the first clamping member 50 and the second clamping member 52 at the end close to the spindle mechanism 3 increases, and the clamping of the first abutting portion 32 and the second abutting portion 34 is released, so that the pull rod 33 is reset under the action of the elastic member 35 and the clamp 62 is tightened.

[0133] S8: Synchronously with S6, the spindle mechanism 3 descends, driving the second adjustment plate 63 to descend. That is, the second adjustment plate 63 increases the opening and closing angle between the bracket 60 and the frame 1, the tool holder 61 moves away from the spindle mechanism 3, and the clamp 62 is released.

[0134] S9: The spindle mechanism 3 processes the workpiece on the processing table 2;

[0135] S10: After the processing is completed, the workpiece on the processing table 2 is replaced. If the tool needs to be changed, the above S2-S10 are repeated. If the tool does not need to be changed, S8-S10 are repeated.

[0136] It can be seen from this embodiment that through the above-mentioned control method, the drill bit is replaced during the process of the spindle mechanism 3 rising and falling, thereby improving the efficiency of replacing the drill bit and improving the processing efficiency. In addition, the first clamping member 50 and the second clamping member 52 clamp the first abutment portion 32 and the second abutment portion 34 in a scissor-like manner, thereby improving the locking of the spindle 31 when replacing the drill bit, preventing the clamper 62 from being subjected to force on the spindle 31 when the pull rod 33 is engaged, effectively reducing the force on the spindle 31, reducing the impact on the spindle 31, and extending the service life of the spindle 31; and the first adjustment plate 51 is convenient for adjusting the opening and closing angles of the first clamping member 50 and the second clamping member 52 during the process of the spindle mechanism 3 rising and falling, with a simple structure and a high degree of automation, and the second adjustment plate 63 is convenient for opening or retracting the tool magazine during the process of the spindle mechanism 3 rising and falling, thereby improving the degree of automation, and only the second adjustment plate 63 and the bracket 60 are hinged to the frame 1, with a simple structure.

[0137] The embodiments of the present application are described above in conjunction with the accompanying drawings. Unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A drilling center machine tool, characterized in that: include: A machine frame (1), wherein a processing table (2) is mounted on the machine frame (1); A spindle mechanism (3), the spindle mechanism (3) being mounted on the machine frame (1) and located above the processing table (2); A feeding mechanism (4), the feeding mechanism (4) being mounted on the frame (1) and used for feeding the spindle mechanism (3); A locking mechanism (5), wherein the locking mechanism (5) is used for axial locking of the spindle mechanism (3) when changing tools; The spindle mechanism (3) comprises: a housing (30), wherein the housing (30) is mounted on the feeding mechanism (4); A main shaft (31), the main shaft (31) is installed in the housing (30), and both ends of the main shaft extend out of the housing (30), and a first abutment portion (32) is provided at the top end; A pull rod (33), wherein the pull rod (33) is coaxially arranged in the main shaft (31), and the top end of the pull rod (33) extends out of the main shaft (31) and is provided with a second abutting portion (34); Wherein, the locking mechanism (5) is used to limit the first abutting portion (32) and the second abutting portion (34) in the axial direction; The locking mechanism (5) comprises: a first clamping member (50), one end of the first clamping member (50) being hingedly connected to the housing (30) and the other end being clamped to the first abutting portion (32); A first adjustment plate (51), the first adjustment plate (51) being mounted on the frame (1); a second clamping member (52), the second clamping member (52) being hingedly connected to the first clamping member (50), with one end abutting against the first adjustment plate (51) and the other end abutting against the second abutting portion (34); The first adjustment plate (51) is used to adjust the opening and closing angle between the first clamping member (50) and the second clamping member (52).

2. The drilling center machine tool according to claim 1, characterized in that: The locking mechanism (5) further comprises: a first roller (53), the first roller (53) being mounted on one end of the second clamping member (52) close to the first adjustment plate (51); a second roller (54), the second roller (54) being mounted on one end of the second clamping member (52) close to the second abutting portion (34); The first roller (53) is used for rolling on the first adjustment plate (51), and the second roller (54) is used for rolling on the surface of the second abutting portion (34).

3. The drilling center machine tool according to claim 1, characterized in that The spindle mechanism (3) further comprises: An elastic member (35), wherein the elastic member (35) is installed in the main shaft (31) and is sleeved on the surface of the pull rod (33), and the two ends of the elastic member are respectively in contact with the main shaft (31) and the pull rod (33); The pull rod (33) is slidably connected in the main shaft (31) along the axial direction.

4. The drilling center machine tool according to claim 3, characterized in that Also includes: A tool magazine mechanism (6), wherein the tool magazine mechanism (6) is mounted on the frame (1) and is located on a side of the housing (30); Wherein, the tool magazine mechanism (6) comprises: a bracket (60), wherein the bracket (60) is hingedly connected to the frame (1); A tool holder (61), the tool holder (61) is mounted on the bracket (60), is rotatably connected to the bracket (60), and is provided with a motor to drive the rotation; A plurality of clamps (62) are provided on the tool holder (61) at equal intervals around the circumference and are used to clamp the drill bit; The clamp (62) at the lowest position is coaxially arranged with the main shaft (31), and the clamp (62) is adapted to the bottom end of the pull rod (33).

5. The drilling center machine tool according to claim 4, characterized in that: The tool magazine mechanism (6) further comprises: a second adjustment plate (63), the second adjustment plate (63) being mounted on a side surface of the housing (30); A push rod (64), one end of which is connected to the bracket (60) and the other end of which is in contact with the second adjustment plate (63); The second adjustment plate (63) is used to adjust the opening and closing angle between the bracket (60) and the frame (1).

6. The drilling center machine tool according to claim 5, characterized in that: The tool magazine mechanism (6) further comprises: a third roller (65), the third roller (65) being mounted on one end of the push rod (64) close to the second adjustment plate (63); Wherein, the third roller (65) is used for rolling on the first adjustment plate (51).

7. The drilling center machine tool according to claim 1, characterized in that: The feeding mechanism (4) comprises: A cross slide (40), the cross slide (40) being mounted on the machine frame (1) and used to connect the processing table (2) and the machine frame (1), and to drive the processing table (2) to move in a horizontal direction; A screw drive assembly (41) is mounted on the frame (1) and is driven by a motor and is used to drive the spindle mechanism (3) to move in a vertical direction.

8. The drilling center machine tool according to claim 6, characterized in that: The control method of the drilling center machine tool comprises the following steps: S1: All mechanisms are powered on and enter standby mode; S2: the feed mechanism (4) drives the spindle mechanism (3) to ascend and reset; S3: When the main shaft mechanism (3) rises, the locking mechanism (5) is driven to rise. Under the influence of the first adjustment plate (51), the opening and closing angle of the first clamping member (50) and the second clamping member (52) close to the main shaft mechanism (3) is reduced, and the first abutting portion (32) and the second abutting portion (34) are clamped, so that the pull rod (33) compresses the elastic member (35) and slides down, and the clamp (62) is released; S4: Synchronously with S2, the spindle mechanism (3) rises and drives the second adjustment plate (63) to rise, that is, the second adjustment plate (63) reduces the opening and closing angle between the bracket (60) and the frame (1), and the tool holder (61) approaches the spindle mechanism (3) and engages with the clamp (62); S5: The spindle mechanism (3) is lifted and reset, and the motor drives the tool holder (61) to rotate and select a suitable drill bit; S6: The feed mechanism (4) drives the spindle mechanism (3) to lower the tool and perform cutting operations; S7: When the main shaft mechanism (3) descends, the locking mechanism (5) is driven to descend. Under the influence of the first adjustment plate (51), the opening and closing angle of the first clamping member (50) and the second clamping member (52) close to the main shaft mechanism (3) increases, and the clamping of the first abutting portion (32) and the second abutting portion (34) is released, so that the pull rod (33) is reset under the action of the elastic member (35) and the clamp (62) is tightened; S8: Synchronously with S6, the spindle mechanism (3) descends, driving the second adjustment plate (63) to descend, i.e., the second adjustment plate (63) increases the opening and closing angle between the bracket (60) and the frame (1), the tool holder (61) moves away from the spindle mechanism (3), and the clamp (62) is released; S9: the spindle mechanism (3) processes the workpiece on the processing table (2); S10: After the processing is completed, the workpiece on the processing table (2) is replaced. If the tool needs to be changed, the above S2-S10 are repeated. If the tool does not need to be changed, S8-S10 are repeated.

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